diff options
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/Makefile | 3 | ||||
| -rw-r--r-- | drivers/dma/ioat/Makefile | 2 | ||||
| -rw-r--r-- | drivers/dma/ioat/dca.c (renamed from drivers/dma/ioat_dca.c) | 13 | ||||
| -rw-r--r-- | drivers/dma/ioat/dma.c | 1139 | ||||
| -rw-r--r-- | drivers/dma/ioat/dma.h | 306 | ||||
| -rw-r--r-- | drivers/dma/ioat/dma_v2.c | 881 | ||||
| -rw-r--r-- | drivers/dma/ioat/dma_v2.h | 146 | ||||
| -rw-r--r-- | drivers/dma/ioat/hw.h (renamed from drivers/dma/ioatdma_hw.h) | 45 | ||||
| -rw-r--r-- | drivers/dma/ioat/pci.c (renamed from drivers/dma/ioat.c) | 147 | ||||
| -rw-r--r-- | drivers/dma/ioat/registers.h (renamed from drivers/dma/ioatdma_registers.h) | 34 | ||||
| -rw-r--r-- | drivers/dma/ioat_dma.c | 1741 | ||||
| -rw-r--r-- | drivers/dma/ioatdma.h | 165 | ||||
| -rw-r--r-- | drivers/dma/iovlock.c | 10 |
13 files changed, 2598 insertions, 2034 deletions
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index 40e1e008357..8f115e93b4a 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -1,8 +1,7 @@ obj-$(CONFIG_DMA_ENGINE) += dmaengine.o obj-$(CONFIG_NET_DMA) += iovlock.o obj-$(CONFIG_DMATEST) += dmatest.o -obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o -ioatdma-objs := ioat.o ioat_dma.o ioat_dca.o +obj-$(CONFIG_INTEL_IOATDMA) += ioat/ obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o obj-$(CONFIG_FSL_DMA) += fsldma.o obj-$(CONFIG_MV_XOR) += mv_xor.o diff --git a/drivers/dma/ioat/Makefile b/drivers/dma/ioat/Makefile new file mode 100644 index 00000000000..205a639e84d --- /dev/null +++ b/drivers/dma/ioat/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o +ioatdma-objs := pci.o dma.o dma_v2.o dca.o diff --git a/drivers/dma/ioat_dca.c b/drivers/dma/ioat/dca.c index c012a1e1504..69d02615c4d 100644 --- a/drivers/dma/ioat_dca.c +++ b/drivers/dma/ioat/dca.c @@ -33,8 +33,8 @@ #define cpu_physical_id(cpu) (cpuid_ebx(1) >> 24) #endif -#include "ioatdma.h" -#include "ioatdma_registers.h" +#include "dma.h" +#include "registers.h" /* * Bit 7 of a tag map entry is the "valid" bit, if it is set then bits 0:6 @@ -242,7 +242,8 @@ static struct dca_ops ioat_dca_ops = { }; -struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase) +struct dca_provider * __devinit +ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase) { struct dca_provider *dca; struct ioat_dca_priv *ioatdca; @@ -407,7 +408,8 @@ static int ioat2_dca_count_dca_slots(void __iomem *iobase, u16 dca_offset) return slots; } -struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase) +struct dca_provider * __devinit +ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase) { struct dca_provider *dca; struct ioat_dca_priv *ioatdca; @@ -602,7 +604,8 @@ static int ioat3_dca_count_dca_slots(void *iobase, u16 dca_offset) return slots; } -struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase) +struct dca_provider * __devinit +ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase) { struct dca_provider *dca; struct ioat_dca_priv *ioatdca; diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c new file mode 100644 index 00000000000..17a518d0386 --- /dev/null +++ b/drivers/dma/ioat/dma.c @@ -0,0 +1,1139 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2004 - 2009 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +/* + * This driver supports an Intel I/OAT DMA engine, which does asynchronous + * copy operations. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/workqueue.h> +#include <linux/i7300_idle.h> +#include "dma.h" +#include "registers.h" +#include "hw.h" + +int ioat_pending_level = 4; +module_param(ioat_pending_level, int, 0644); +MODULE_PARM_DESC(ioat_pending_level, + "high-water mark for pushing ioat descriptors (default: 4)"); + +/* internal functions */ +static void ioat1_cleanup(struct ioat_dma_chan *ioat); +static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat); + +/** + * ioat_dma_do_interrupt - handler used for single vector interrupt mode + * @irq: interrupt id + * @data: interrupt data + */ +static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) +{ + struct ioatdma_device *instance = data; + struct ioat_chan_common *chan; + unsigned long attnstatus; + int bit; + u8 intrctrl; + + intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET); + + if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN)) + return IRQ_NONE; + + if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) { + writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); + return IRQ_NONE; + } + + attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET); + for_each_bit(bit, &attnstatus, BITS_PER_LONG) { + chan = ioat_chan_by_index(instance, bit); + tasklet_schedule(&chan->cleanup_task); + } + + writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); + return IRQ_HANDLED; +} + +/** + * ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode + * @irq: interrupt id + * @data: interrupt data + */ +static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) +{ + struct ioat_chan_common *chan = data; + + tasklet_schedule(&chan->cleanup_task); + + return IRQ_HANDLED; +} + +static void ioat1_cleanup_tasklet(unsigned long data); + +/* common channel initialization */ +void ioat_init_channel(struct ioatdma_device *device, + struct ioat_chan_common *chan, int idx, + void (*timer_fn)(unsigned long), + void (*tasklet)(unsigned long), + unsigned long ioat) +{ + struct dma_device *dma = &device->common; + + chan->device = device; + chan->reg_base = device->reg_base + (0x80 * (idx + 1)); + spin_lock_init(&chan->cleanup_lock); + chan->common.device = dma; + list_add_tail(&chan->common.device_node, &dma->channels); + device->idx[idx] = chan; + init_timer(&chan->timer); + chan->timer.function = timer_fn; + chan->timer.data = ioat; + tasklet_init(&chan->cleanup_task, tasklet, ioat); + tasklet_disable(&chan->cleanup_task); +} + +static void ioat1_timer_event(unsigned long data); + +/** + * ioat1_dma_enumerate_channels - find and initialize the device's channels + * @device: the device to be enumerated + */ +static int ioat1_enumerate_channels(struct ioatdma_device *device) +{ + u8 xfercap_scale; + u32 xfercap; + int i; + struct ioat_dma_chan *ioat; + struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; + + INIT_LIST_HEAD(&dma->channels); + dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + dma->chancnt &= 0x1f; /* bits [4:0] valid */ + if (dma->chancnt > ARRAY_SIZE(device->idx)) { + dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", + dma->chancnt, ARRAY_SIZE(device->idx)); + dma->chancnt = ARRAY_SIZE(device->idx); + } + xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET); + xfercap_scale &= 0x1f; /* bits [4:0] valid */ + xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); + dev_dbg(dev, "%s: xfercap = %d\n", __func__, xfercap); + +#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL + if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) + dma->chancnt--; +#endif + for (i = 0; i < dma->chancnt; i++) { + ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); + if (!ioat) + break; + + ioat_init_channel(device, &ioat->base, i, + ioat1_timer_event, + ioat1_cleanup_tasklet, + (unsigned long) ioat); + ioat->xfercap = xfercap; + spin_lock_init(&ioat->desc_lock); + INIT_LIST_HEAD(&ioat->free_desc); + INIT_LIST_HEAD(&ioat->used_desc); + } + dma->chancnt = i; + return i; +} + +/** + * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended + * descriptors to hw + * @chan: DMA channel handle + */ +static inline void +__ioat1_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat) +{ + void __iomem *reg_base = ioat->base.reg_base; + + dev_dbg(to_dev(&ioat->base), "%s: pending: %d\n", + __func__, ioat->pending); + ioat->pending = 0; + writeb(IOAT_CHANCMD_APPEND, reg_base + IOAT1_CHANCMD_OFFSET); +} + +static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(chan); + + if (ioat->pending > 0) { + spin_lock_bh(&ioat->desc_lock); + __ioat1_dma_memcpy_issue_pending(ioat); + spin_unlock_bh(&ioat->desc_lock); + } +} + +/** + * ioat1_reset_channel - restart a channel + * @ioat: IOAT DMA channel handle + */ +static void ioat1_reset_channel(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + void __iomem *reg_base = chan->reg_base; + u32 chansts, chanerr; + + dev_warn(to_dev(chan), "reset\n"); + chanerr = readl(reg_base + IOAT_CHANERR_OFFSET); + chansts = *chan->completion & IOAT_CHANSTS_STATUS; + if (chanerr) { + dev_err(to_dev(chan), + "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", + chan_num(chan), chansts, chanerr); + writel(chanerr, reg_base + IOAT_CHANERR_OFFSET); + } + + /* + * whack it upside the head with a reset + * and wait for things to settle out. + * force the pending count to a really big negative + * to make sure no one forces an issue_pending + * while we're waiting. + */ + + ioat->pending = INT_MIN; + writeb(IOAT_CHANCMD_RESET, + reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); + set_bit(IOAT_RESET_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + RESET_DELAY); +} + +static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct dma_chan *c = tx->chan; + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_desc_sw *desc = tx_to_ioat_desc(tx); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_desc_sw *first; + struct ioat_desc_sw *chain_tail; + dma_cookie_t cookie; + + spin_lock_bh(&ioat->desc_lock); + /* cookie incr and addition to used_list must be atomic */ + cookie = c->cookie; + cookie++; + if (cookie < 0) + cookie = 1; + c->cookie = cookie; + tx->cookie = cookie; + dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); + + /* write address into NextDescriptor field of last desc in chain */ + first = to_ioat_desc(tx->tx_list.next); + chain_tail = to_ioat_desc(ioat->used_desc.prev); + /* make descriptor updates globally visible before chaining */ + wmb(); + chain_tail->hw->next = first->txd.phys; + list_splice_tail_init(&tx->tx_list, &ioat->used_desc); + dump_desc_dbg(ioat, chain_tail); + dump_desc_dbg(ioat, first); + + if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state)) + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + ioat->pending += desc->hw->tx_cnt; + if (ioat->pending >= ioat_pending_level) + __ioat1_dma_memcpy_issue_pending(ioat); + spin_unlock_bh(&ioat->desc_lock); + + return cookie; +} + +/** + * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair + * @ioat: the channel supplying the memory pool for the descriptors + * @flags: allocation flags + */ +static struct ioat_desc_sw * +ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) +{ + struct ioat_dma_descriptor *desc; + struct ioat_desc_sw *desc_sw; + struct ioatdma_device *ioatdma_device; + dma_addr_t phys; + + ioatdma_device = ioat->base.device; + desc = pci_pool_alloc(ioatdma_device->dma_pool, flags, &phys); + if (unlikely(!desc)) + return NULL; + + desc_sw = kzalloc(sizeof(*desc_sw), flags); + if (unlikely(!desc_sw)) { + pci_pool_free(ioatdma_device->dma_pool, desc, phys); + return NULL; + } + + memset(desc, 0, sizeof(*desc)); + + dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); + desc_sw->txd.tx_submit = ioat1_tx_submit; + desc_sw->hw = desc; + desc_sw->txd.phys = phys; + set_desc_id(desc_sw, -1); + + return desc_sw; +} + +static int ioat_initial_desc_count = 256; +module_param(ioat_initial_desc_count, int, 0644); +MODULE_PARM_DESC(ioat_initial_desc_count, + "ioat1: initial descriptors per channel (default: 256)"); +/** + * ioat1_dma_alloc_chan_resources - returns the number of allocated descriptors + * @chan: the channel to be filled out + */ +static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_desc_sw *desc; + u32 chanerr; + int i; + LIST_HEAD(tmp_list); + + /* have we already been set up? */ + if (!list_empty(&ioat->free_desc)) + return ioat->desccount; + + /* Setup register to interrupt and write completion status on error */ + writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + if (chanerr) { + dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + } + + /* Allocate descriptors */ + for (i = 0; i < ioat_initial_desc_count; i++) { + desc = ioat_dma_alloc_descriptor(ioat, GFP_KERNEL); + if (!desc) { + dev_err(to_dev(chan), "Only %d initial descriptors\n", i); + break; + } + set_desc_id(desc, i); + list_add_tail(&desc->node, &tmp_list); + } + spin_lock_bh(&ioat->desc_lock); + ioat->desccount = i; + list_splice(&tmp_list, &ioat->free_desc); + spin_unlock_bh(&ioat->desc_lock); + + /* allocate a completion writeback area */ + /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ + chan->completion = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, &chan->completion_dma); + memset(chan->completion, 0, sizeof(*chan->completion)); + writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); + writel(((u64) chan->completion_dma) >> 32, + chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); + + tasklet_enable(&chan->cleanup_task); + ioat1_dma_start_null_desc(ioat); /* give chain to dma device */ + dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n", + __func__, ioat->desccount); + return ioat->desccount; +} + +/** + * ioat1_dma_free_chan_resources - release all the descriptors + * @chan: the channel to be cleaned + */ +static void ioat1_dma_free_chan_resources(struct dma_chan *c) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *ioatdma_device = chan->device; + struct ioat_desc_sw *desc, *_desc; + int in_use_descs = 0; + + /* Before freeing channel resources first check + * if they have been previously allocated for this channel. + */ + if (ioat->desccount == 0) + return; + + tasklet_disable(&chan->cleanup_task); + del_timer_sync(&chan->timer); + ioat1_cleanup(ioat); + + /* Delay 100ms after reset to allow internal DMA logic to quiesce + * before removing DMA descriptor resources. + */ + writeb(IOAT_CHANCMD_RESET, + chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); + mdelay(100); + + spin_lock_bh(&ioat->desc_lock); + list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { + dev_dbg(to_dev(chan), "%s: freeing %d from used list\n", + __func__, desc_id(desc)); + dump_desc_dbg(ioat, desc); + in_use_descs++; + list_del(&desc->node); + pci_pool_free(ioatdma_device->dma_pool, desc->hw, + desc->txd.phys); + kfree(desc); + } + list_for_each_entry_safe(desc, _desc, + &ioat->free_desc, node) { + list_del(&desc->node); + pci_pool_free(ioatdma_device->dma_pool, desc->hw, + desc->txd.phys); + kfree(desc); + } + spin_unlock_bh(&ioat->desc_lock); + + pci_pool_free(ioatdma_device->completion_pool, + chan->completion, + chan->completion_dma); + + /* one is ok since we left it on there on purpose */ + if (in_use_descs > 1) + dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", + in_use_descs - 1); + + chan->last_completion = 0; + chan->completion_dma = 0; + ioat->pending = 0; + ioat->desccount = 0; +} + +/** + * ioat1_dma_get_next_descriptor - return the next available descriptor + * @ioat: IOAT DMA channel handle + * + * Gets the next descriptor from the chain, and must be called with the + * channel's desc_lock held. Allocates more descriptors if the channel + * has run out. + */ +static struct ioat_desc_sw * +ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat) +{ + struct ioat_desc_sw *new; + + if (!list_empty(&ioat->free_desc)) { + new = to_ioat_desc(ioat->free_desc.next); + list_del(&new->node); + } else { + /* try to get another desc */ + new = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC); + if (!new) { + dev_err(to_dev(&ioat->base), "alloc failed\n"); + return NULL; + } + } + dev_dbg(to_dev(&ioat->base), "%s: allocated: %d\n", + __func__, desc_id(new)); + prefetch(new->hw); + return new; +} + +static struct dma_async_tx_descriptor * +ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_desc_sw *desc; + size_t copy; + LIST_HEAD(chain); + dma_addr_t src = dma_src; + dma_addr_t dest = dma_dest; + size_t total_len = len; + struct ioat_dma_descriptor *hw = NULL; + int tx_cnt = 0; + + spin_lock_bh(&ioat->desc_lock); + desc = ioat1_dma_get_next_descriptor(ioat); + do { + if (!desc) + break; + + tx_cnt++; + copy = min_t(size_t, len, ioat->xfercap); + + hw = desc->hw; + hw->size = copy; + hw->ctl = 0; + hw->src_addr = src; + hw->dst_addr = dest; + + list_add_tail(&desc->node, &chain); + + len -= copy; + dest += copy; + src += copy; + if (len) { + struct ioat_desc_sw *next; + + async_tx_ack(&desc->txd); + next = ioat1_dma_get_next_descriptor(ioat); + hw->next = next ? next->txd.phys : 0; + dump_desc_dbg(ioat, desc); + desc = next; + } else + hw->next = 0; + } while (len); + + if (!desc) { + struct ioat_chan_common *chan = &ioat->base; + + dev_err(to_dev(chan), + "chan%d - get_next_desc failed\n", chan_num(chan)); + list_splice(&chain, &ioat->free_desc); + spin_unlock_bh(&ioat->desc_lock); + return NULL; + } + spin_unlock_bh(&ioat->desc_lock); + + desc->txd.flags = flags; + desc->len = total_len; + list_splice(&chain, &desc->txd.tx_list); + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + hw->tx_cnt = tx_cnt; + dump_desc_dbg(ioat, desc); + + return &desc->txd; +} + +static void ioat1_cleanup_tasklet(unsigned long data) +{ + struct ioat_dma_chan *chan = (void *)data; + + ioat1_cleanup(chan); + writew(IOAT_CHANCTRL_RUN, chan->base.reg_base + IOAT_CHANCTRL_OFFSET); +} + +static void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len, + int direction, enum dma_ctrl_flags flags, bool dst) +{ + if ((dst && (flags & DMA_COMPL_DEST_UNMAP_SINGLE)) || + (!dst && (flags & DMA_COMPL_SRC_UNMAP_SINGLE))) + pci_unmap_single(pdev, addr, len, direction); + else + pci_unmap_page(pdev, addr, len, direction); +} + + +void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, + size_t len, struct ioat_dma_descriptor *hw) +{ + struct pci_dev *pdev = chan->device->pdev; + size_t offset = len - hw->size; + + if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) + ioat_unmap(pdev, hw->dst_addr - offset, len, + PCI_DMA_FROMDEVICE, flags, 1); + + if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) + ioat_unmap(pdev, hw->src_addr - offset, len, + PCI_DMA_TODEVICE, flags, 0); +} + +unsigned long ioat_get_current_completion(struct ioat_chan_common *chan) +{ + unsigned long phys_complete; + u64 completion; + + completion = *chan->completion; + phys_complete = ioat_chansts_to_addr(completion); + + dev_dbg(to_dev(chan), "%s: phys_complete: %#llx\n", __func__, + (unsigned long long) phys_complete); + + if (is_ioat_halted(completion)) { + u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + dev_err(to_dev(chan), "Channel halted, chanerr = %x\n", + chanerr); + + /* TODO do something to salvage the situation */ + } + + return phys_complete; +} + +bool ioat_cleanup_preamble(struct ioat_chan_common *chan, + unsigned long *phys_complete) +{ + *phys_complete = ioat_get_current_completion(chan); + if (*phys_complete == chan->last_completion) + return false; + clear_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + return true; +} + +static void __cleanup(struct ioat_dma_chan *ioat, unsigned long phys_complete) +{ + struct ioat_chan_common *chan = &ioat->base; + struct list_head *_desc, *n; + struct dma_async_tx_descriptor *tx; + + dev_dbg(to_dev(chan), "%s: phys_complete: %lx\n", + __func__, phys_complete); + list_for_each_safe(_desc, n, &ioat->used_desc) { + struct ioat_desc_sw *desc; + + prefetch(n); + desc = list_entry(_desc, typeof(*desc), node); + tx = &desc->txd; + /* + * Incoming DMA requests may use multiple descriptors, + * due to exceeding xfercap, perhaps. If so, only the + * last one will have a cookie, and require unmapping. + */ + dump_desc_dbg(ioat, desc); + if (tx->cookie) { + chan->completed_cookie = tx->cookie; + tx->cookie = 0; + ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + + if (tx->phys != phys_complete) { + /* + * a completed entry, but not the last, so clean + * up if the client is done with the descriptor + */ + if (async_tx_test_ack(tx)) + list_move_tail(&desc->node, &ioat->free_desc); + } else { + /* + * last used desc. Do not remove, so we can + * append from it. + */ + + /* if nothing else is pending, cancel the + * completion timeout + */ + if (n == &ioat->used_desc) { + dev_dbg(to_dev(chan), + "%s cancel completion timeout\n", + __func__); + clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + } + + /* TODO check status bits? */ + break; + } + } + + chan->last_completion = phys_complete; +} + +/** + * ioat1_cleanup - cleanup up finished descriptors + * @chan: ioat channel to be cleaned up + * + * To prevent lock contention we defer cleanup when the locks are + * contended with a terminal timeout that forces cleanup and catches + * completion notification errors. + */ +static void ioat1_cleanup(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + + prefetch(chan->completion); + + if (!spin_trylock_bh(&chan->cleanup_lock)) + return; + + if (!ioat_cleanup_preamble(chan, &phys_complete)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + if (!spin_trylock_bh(&ioat->desc_lock)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + __cleanup(ioat, phys_complete); + + spin_unlock_bh(&ioat->desc_lock); + spin_unlock_bh(&chan->cleanup_lock); +} + +static void ioat1_timer_event(unsigned long data) +{ + struct ioat_dma_chan *ioat = (void *) data; + struct ioat_chan_common *chan = &ioat->base; + + dev_dbg(to_dev(chan), "%s: state: %lx\n", __func__, chan->state); + + spin_lock_bh(&chan->cleanup_lock); + if (test_and_clear_bit(IOAT_RESET_PENDING, &chan->state)) { + struct ioat_desc_sw *desc; + + spin_lock_bh(&ioat->desc_lock); + + /* restart active descriptors */ + desc = to_ioat_desc(ioat->used_desc.prev); + ioat_set_chainaddr(ioat, desc->txd.phys); + ioat_start(chan); + + ioat->pending = 0; + set_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + spin_unlock_bh(&ioat->desc_lock); + } else if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) { + unsigned long phys_complete; + + spin_lock_bh(&ioat->desc_lock); + /* if we haven't made progress and we have already + * acknowledged a pending completion once, then be more + * forceful with a restart + */ + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) + ioat1_reset_channel(ioat); + else { + u64 status = ioat_chansts(chan); + + /* manually update the last completion address */ + if (ioat_chansts_to_addr(status) != 0) + *chan->completion = status; + + set_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + } + spin_unlock_bh(&ioat->desc_lock); + } + spin_unlock_bh(&chan->cleanup_lock); +} + +static enum dma_status +ioat1_dma_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + + if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) + return DMA_SUCCESS; + + ioat1_cleanup(ioat); + + return ioat_is_complete(c, cookie, done, used); +} + +static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + struct ioat_desc_sw *desc; + struct ioat_dma_descriptor *hw; + + spin_lock_bh(&ioat->desc_lock); + + desc = ioat1_dma_get_next_descriptor(ioat); + + if (!desc) { + dev_err(to_dev(chan), + "Unable to start null desc - get next desc failed\n"); + spin_unlock_bh(&ioat->desc_lock); + return; + } + + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.compl_write = 1; + /* set size to non-zero value (channel returns error when size is 0) */ + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; + async_tx_ack(&desc->txd); + hw->next = 0; + list_add_tail(&desc->node, &ioat->used_desc); + dump_desc_dbg(ioat, desc); + + ioat_set_chainaddr(ioat, desc->txd.phys); + ioat_start(chan); + spin_unlock_bh(&ioat->desc_lock); +} + +/* + * Perform a IOAT transaction to verify the HW works. + */ +#define IOAT_TEST_SIZE 2000 + +static void __devinit ioat_dma_test_callback(void *dma_async_param) +{ + struct completion *cmp = dma_async_param; + + complete(cmp); +} + +/** + * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works. + * @device: device to be tested + */ +static int __devinit ioat_dma_self_test(struct ioatdma_device *device) +{ + int i; + u8 *src; + u8 *dest; + struct dma_device *dma = &device->common; + struct device *dev = &device->pdev->dev; + struct dma_chan *dma_chan; + struct dma_async_tx_descriptor *tx; + dma_addr_t dma_dest, dma_src; + dma_cookie_t cookie; + int err = 0; + struct completion cmp; + unsigned long tmo; + unsigned long flags; + + src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); + if (!src) + return -ENOMEM; + dest = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); + if (!dest) { + kfree(src); + return -ENOMEM; + } + + /* Fill in src buffer */ + for (i = 0; i < IOAT_TEST_SIZE; i++) + src[i] = (u8)i; + + /* Start copy, using first DMA channel */ + dma_chan = container_of(dma->channels.next, struct dma_chan, + device_node); + if (dma->device_alloc_chan_resources(dma_chan) < 1) { + dev_err(dev, "selftest cannot allocate chan resource\n"); + err = -ENODEV; + goto out; + } + + dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE); + dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); + flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_COMPL_DEST_UNMAP_SINGLE | + DMA_PREP_INTERRUPT; + tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src, + IOAT_TEST_SIZE, flags); + if (!tx) { + dev_err(dev, "Self-test prep failed, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test setup failed, disabling\n"); + err = -ENODEV; + goto free_resources; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (tmo == 0 || + dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) + != DMA_SUCCESS) { + dev_err(dev, "Self-test copy timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + if (memcmp(src, dest, IOAT_TEST_SIZE)) { + dev_err(dev, "Self-test copy failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + +free_resources: + dma->device_free_chan_resources(dma_chan); +out: + kfree(src); + kfree(dest); + return err; +} + +static char ioat_interrupt_style[32] = "msix"; +module_param_string(ioat_interrupt_style, ioat_interrupt_style, + sizeof(ioat_interrupt_style), 0644); +MODULE_PARM_DESC(ioat_interrupt_style, + "set ioat interrupt style: msix (default), " + "msix-single-vector, msi, intx)"); + +/** + * ioat_dma_setup_interrupts - setup interrupt handler + * @device: ioat device + */ +static int ioat_dma_setup_interrupts(struct ioatdma_device *device) +{ + struct ioat_chan_common *chan; + struct pci_dev *pdev = device->pdev; + struct device *dev = &pdev->dev; + struct msix_entry *msix; + int i, j, msixcnt; + int err = -EINVAL; + u8 intrctrl = 0; + + if (!strcmp(ioat_interrupt_style, "msix")) + goto msix; + if (!strcmp(ioat_interrupt_style, "msix-single-vector")) + goto msix_single_vector; + if (!strcmp(ioat_interrupt_style, "msi")) + goto msi; + if (!strcmp(ioat_interrupt_style, "intx")) + goto intx; + dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style); + goto err_no_irq; + +msix: + /* The number of MSI-X vectors should equal the number of channels */ + msixcnt = device->common.chancnt; + for (i = 0; i < msixcnt; i++) + device->msix_entries[i].entry = i; + + err = pci_enable_msix(pdev, device->msix_entries, msixcnt); + if (err < 0) + goto msi; + if (err > 0) + goto msix_single_vector; + + for (i = 0; i < msixcnt; i++) { + msix = &device->msix_entries[i]; + chan = ioat_chan_by_index(device, i); + err = devm_request_irq(dev, msix->vector, + ioat_dma_do_interrupt_msix, 0, + "ioat-msix", chan); + if (err) { + for (j = 0; j < i; j++) { + msix = &device->msix_entries[j]; + chan = ioat_chan_by_index(device, j); + devm_free_irq(dev, msix->vector, chan); + } + goto msix_single_vector; + } + } + intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL; + goto done; + +msix_single_vector: + msix = &device->msix_entries[0]; + msix->entry = 0; + err = pci_enable_msix(pdev, device->msix_entries, 1); + if (err) + goto msi; + + err = devm_request_irq(dev, msix->vector, ioat_dma_do_interrupt, 0, + "ioat-msix", device); + if (err) { + pci_disable_msix(pdev); + goto msi; + } + goto done; + +msi: + err = pci_enable_msi(pdev); + if (err) + goto intx; + + err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0, + "ioat-msi", device); + if (err) { + pci_disable_msi(pdev); + goto intx; + } + goto done; + +intx: + err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, + IRQF_SHARED, "ioat-intx", device); + if (err) + goto err_no_irq; + +done: + if (device->intr_quirk) + device->intr_quirk(device); + intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN; + writeb(intrctrl, device->reg_base + IOAT_INTRCTRL_OFFSET); + return 0; + +err_no_irq: + /* Disable all interrupt generation */ + writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); + dev_err(dev, "no usable interrupts\n"); + return err; +} + +static void ioat_disable_interrupts(struct ioatdma_device *device) +{ + /* Disable all interrupt generation */ + writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); +} + +int __devinit ioat_probe(struct ioatdma_device *device) +{ + int err = -ENODEV; + struct dma_device *dma = &device->common; + struct pci_dev *pdev = device->pdev; + struct device *dev = &pdev->dev; + + /* DMA coherent memory pool for DMA descriptor allocations */ + device->dma_pool = pci_pool_create("dma_desc_pool", pdev, + sizeof(struct ioat_dma_descriptor), + 64, 0); + if (!device->dma_pool) { + err = -ENOMEM; + goto err_dma_pool; + } + + device->completion_pool = pci_pool_create("completion_pool", pdev, + sizeof(u64), SMP_CACHE_BYTES, + SMP_CACHE_BYTES); + + if (!device->completion_pool) { + err = -ENOMEM; + goto err_completion_pool; + } + + device->enumerate_channels(device); + + dma_cap_set(DMA_MEMCPY, dma->cap_mask); + dma->dev = &pdev->dev; + + dev_err(dev, "Intel(R) I/OAT DMA Engine found," + " %d channels, device version 0x%02x, driver version %s\n", + dma->chancnt, device->version, IOAT_DMA_VERSION); + + if (!dma->chancnt) { + dev_err(dev, "Intel(R) I/OAT DMA Engine problem found: " + "zero channels detected\n"); + goto err_setup_interrupts; + } + + err = ioat_dma_setup_interrupts(device); + if (err) + goto err_setup_interrupts; + + err = ioat_dma_self_test(device); + if (err) + goto err_self_test; + + return 0; + +err_self_test: + ioat_disable_interrupts(device); +err_setup_interrupts: + pci_pool_destroy(device->completion_pool); +err_completion_pool: + pci_pool_destroy(device->dma_pool); +err_dma_pool: + return err; +} + +int __devinit ioat_register(struct ioatdma_device *device) +{ + int err = dma_async_device_register(&device->common); + + if (err) { + ioat_disable_interrupts(device); + pci_pool_destroy(device->completion_pool); + pci_pool_destroy(device->dma_pool); + } + + return err; +} + +/* ioat1_intr_quirk - fix up dma ctrl register to enable / disable msi */ +static void ioat1_intr_quirk(struct ioatdma_device *device) +{ + struct pci_dev *pdev = device->pdev; + u32 dmactrl; + + pci_read_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, &dmactrl); + if (pdev->msi_enabled) + dmactrl |= IOAT_PCI_DMACTRL_MSI_EN; + else + dmactrl &= ~IOAT_PCI_DMACTRL_MSI_EN; + pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl); +} + +int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + int err; + + device->intr_quirk = ioat1_intr_quirk; + device->enumerate_channels = ioat1_enumerate_channels; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; + dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; + dma->device_alloc_chan_resources = ioat1_dma_alloc_chan_resources; + dma->device_free_chan_resources = ioat1_dma_free_chan_resources; + dma->device_is_tx_complete = ioat1_dma_is_complete; + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(4096); + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat_dca_init(pdev, device->reg_base); + + return err; +} + +void __devexit ioat_dma_remove(struct ioatdma_device *device) +{ + struct dma_device *dma = &device->common; + + ioat_disable_interrupts(device); + + dma_async_device_unregister(dma); + + pci_pool_destroy(device->dma_pool); + pci_pool_destroy(device->completion_pool); + + INIT_LIST_HEAD(&dma->channels); +} diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h new file mode 100644 index 00000000000..d9d6a7e3cd7 --- /dev/null +++ b/drivers/dma/ioat/dma.h @@ -0,0 +1,306 @@ +/* + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#ifndef IOATDMA_H +#define IOATDMA_H + +#include <linux/dmaengine.h> +#include "hw.h" +#include "registers.h" +#include <linux/init.h> +#include <linux/dmapool.h> +#include <linux/cache.h> +#include <linux/pci_ids.h> +#include <net/tcp.h> + +#define IOAT_DMA_VERSION "3.64" + +#define IOAT_LOW_COMPLETION_MASK 0xffffffc0 +#define IOAT_DMA_DCA_ANY_CPU ~0 + +#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) +#define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) +#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, txd) +#define to_dev(ioat_chan) (&(ioat_chan)->device->pdev->dev) + +#define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) + +/* + * workaround for IOAT ver.3.0 null descriptor issue + * (channel returns error when size is 0) + */ +#define NULL_DESC_BUFFER_SIZE 1 + +/** + * struct ioatdma_device - internal representation of a IOAT device + * @pdev: PCI-Express device + * @reg_base: MMIO register space base address + * @dma_pool: for allocating DMA descriptors + * @common: embedded struct dma_device + * @version: version of ioatdma device + * @msix_entries: irq handlers + * @idx: per channel data + * @dca: direct cache access context + * @intr_quirk: interrupt setup quirk (for ioat_v1 devices) + * @enumerate_channels: hw version specific channel enumeration + */ + +struct ioatdma_device { + struct pci_dev *pdev; + void __iomem *reg_base; + struct pci_pool *dma_pool; + struct pci_pool *completion_pool; + struct dma_device common; + u8 version; + struct msix_entry msix_entries[4]; + struct ioat_chan_common *idx[4]; + struct dca_provider *dca; + void (*intr_quirk)(struct ioatdma_device *device); + int (*enumerate_channels)(struct ioatdma_device *device); +}; + +struct ioat_chan_common { + struct dma_chan common; + void __iomem *reg_base; + unsigned long last_completion; + spinlock_t cleanup_lock; + dma_cookie_t completed_cookie; + unsigned long state; + #define IOAT_COMPLETION_PENDING 0 + #define IOAT_COMPLETION_ACK 1 + #define IOAT_RESET_PENDING 2 + struct timer_list timer; + #define COMPLETION_TIMEOUT msecs_to_jiffies(100) + #define IDLE_TIMEOUT msecs_to_jiffies(2000) + #define RESET_DELAY msecs_to_jiffies(100) + struct ioatdma_device *device; + dma_addr_t completion_dma; + u64 *completion; + struct tasklet_struct cleanup_task; +}; + + +/** + * struct ioat_dma_chan - internal representation of a DMA channel + */ +struct ioat_dma_chan { + struct ioat_chan_common base; + + size_t xfercap; /* XFERCAP register value expanded out */ + + spinlock_t desc_lock; + struct list_head free_desc; + struct list_head used_desc; + + int pending; + u16 desccount; +}; + +static inline struct ioat_chan_common *to_chan_common(struct dma_chan *c) +{ + return container_of(c, struct ioat_chan_common, common); +} + +static inline struct ioat_dma_chan *to_ioat_chan(struct dma_chan *c) +{ + struct ioat_chan_common *chan = to_chan_common(c); + + return container_of(chan, struct ioat_dma_chan, base); +} + +/** + * ioat_is_complete - poll the status of an ioat transaction + * @c: channel handle + * @cookie: transaction identifier + * @done: if set, updated with last completed transaction + * @used: if set, updated with last used transaction + */ +static inline enum dma_status +ioat_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) +{ + struct ioat_chan_common *chan = to_chan_common(c); + dma_cookie_t last_used; + dma_cookie_t last_complete; + + last_used = c->cookie; + last_complete = chan->completed_cookie; + + if (done) + *done = last_complete; + if (used) + *used = last_used; + + return dma_async_is_complete(cookie, last_complete, last_used); +} + +/* wrapper around hardware descriptor format + additional software fields */ + +/** + * struct ioat_desc_sw - wrapper around hardware descriptor + * @hw: hardware DMA descriptor + * @node: this descriptor will either be on the free list, + * or attached to a transaction list (async_tx.tx_list) + * @txd: the generic software descriptor for all engines + * @id: identifier for debug + */ +struct ioat_desc_sw { + struct ioat_dma_descriptor *hw; + struct list_head node; + size_t len; + struct dma_async_tx_descriptor txd; + #ifdef DEBUG + int id; + #endif +}; + +#ifdef DEBUG +#define set_desc_id(desc, i) ((desc)->id = (i)) +#define desc_id(desc) ((desc)->id) +#else +#define set_desc_id(desc, i) +#define desc_id(desc) (0) +#endif + +static inline void +__dump_desc_dbg(struct ioat_chan_common *chan, struct ioat_dma_descriptor *hw, + struct dma_async_tx_descriptor *tx, int id) +{ + struct device *dev = to_dev(chan); + + dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x" + " ctl: %#x (op: %d int_en: %d compl: %d)\n", id, + (unsigned long long) tx->phys, + (unsigned long long) hw->next, tx->cookie, tx->flags, + hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write); +} + +#define dump_desc_dbg(c, d) \ + ({ if (d) __dump_desc_dbg(&c->base, d->hw, &d->txd, desc_id(d)); 0; }) + +static inline void ioat_set_tcp_copy_break(unsigned long copybreak) +{ + #ifdef CONFIG_NET_DMA + sysctl_tcp_dma_copybreak = copybreak; + #endif +} + +static inline struct ioat_chan_common * +ioat_chan_by_index(struct ioatdma_device *device, int index) +{ + return device->idx[index]; +} + +static inline u64 ioat_chansts(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + u64 status; + u32 status_lo; + + /* We need to read the low address first as this causes the + * chipset to latch the upper bits for the subsequent read + */ + status_lo = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_LOW(ver)); + status = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_HIGH(ver)); + status <<= 32; + status |= status_lo; + + return status; +} + +static inline void ioat_start(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + + writeb(IOAT_CHANCMD_START, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); +} + +static inline u64 ioat_chansts_to_addr(u64 status) +{ + return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; +} + +static inline u32 ioat_chanerr(struct ioat_chan_common *chan) +{ + return readl(chan->reg_base + IOAT_CHANERR_OFFSET); +} + +static inline void ioat_suspend(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + + writeb(IOAT_CHANCMD_SUSPEND, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); +} + +static inline void ioat_set_chainaddr(struct ioat_dma_chan *ioat, u64 addr) +{ + struct ioat_chan_common *chan = &ioat->base; + + writel(addr & 0x00000000FFFFFFFF, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); + writel(addr >> 32, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); +} + +static inline bool is_ioat_active(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE); +} + +static inline bool is_ioat_idle(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE); +} + +static inline bool is_ioat_halted(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED); +} + +static inline bool is_ioat_suspended(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED); +} + +/* channel was fatally programmed */ +static inline bool is_ioat_bug(unsigned long err) +{ + return !!(err & (IOAT_CHANERR_SRC_ADDR_ERR|IOAT_CHANERR_DEST_ADDR_ERR| + IOAT_CHANERR_NEXT_ADDR_ERR|IOAT_CHANERR_CONTROL_ERR| + IOAT_CHANERR_LENGTH_ERR)); +} + +int __devinit ioat_probe(struct ioatdma_device *device); +int __devinit ioat_register(struct ioatdma_device *device); +int __devinit ioat1_dma_probe(struct ioatdma_device *dev, int dca); +void __devexit ioat_dma_remove(struct ioatdma_device *device); +struct dca_provider * __devinit ioat_dca_init(struct pci_dev *pdev, + void __iomem *iobase); +unsigned long ioat_get_current_completion(struct ioat_chan_common *chan); +void ioat_init_channel(struct ioatdma_device *device, + struct ioat_chan_common *chan, int idx, + void (*timer_fn)(unsigned long), + void (*tasklet)(unsigned long), + unsigned long ioat); +void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, + size_t len, struct ioat_dma_descriptor *hw); +bool ioat_cleanup_preamble(struct ioat_chan_common *chan, + unsigned long *phys_complete); +#endif /* IOATDMA_H */ diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c new file mode 100644 index 00000000000..460b7730133 --- /dev/null +++ b/drivers/dma/ioat/dma_v2.c @@ -0,0 +1,881 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2004 - 2009 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +/* + * This driver supports an Intel I/OAT DMA engine (versions >= 2), which + * does asynchronous data movement and checksumming operations. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/workqueue.h> +#include <linux/i7300_idle.h> +#include "dma.h" +#include "dma_v2.h" +#include "registers.h" +#include "hw.h" + +static int ioat_ring_alloc_order = 8; +module_param(ioat_ring_alloc_order, int, 0644); +MODULE_PARM_DESC(ioat_ring_alloc_order, + "ioat2+: allocate 2^n descriptors per channel (default: n=8)"); +static int ioat_ring_max_alloc_order = IOAT_MAX_ORDER; +module_param(ioat_ring_max_alloc_order, int, 0644); +MODULE_PARM_DESC(ioat_ring_max_alloc_order, + "ioat2+: upper limit for dynamic ring resizing (default: n=16)"); + +static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) +{ + void * __iomem reg_base = ioat->base.reg_base; + + ioat->pending = 0; + ioat->dmacount += ioat2_ring_pending(ioat);; + ioat->issued = ioat->head; + /* make descriptor updates globally visible before notifying channel */ + wmb(); + writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET); + dev_dbg(to_dev(&ioat->base), + "%s: head: %#x tail: %#x issued: %#x count: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); +} + +static void ioat2_issue_pending(struct dma_chan *chan) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(chan); + + spin_lock_bh(&ioat->ring_lock); + if (ioat->pending == 1) + __ioat2_issue_pending(ioat); + spin_unlock_bh(&ioat->ring_lock); +} + +/** + * ioat2_update_pending - log pending descriptors + * @ioat: ioat2+ channel + * + * set pending to '1' unless pending is already set to '2', pending == 2 + * indicates that submission is temporarily blocked due to an in-flight + * reset. If we are already above the ioat_pending_level threshold then + * just issue pending. + * + * called with ring_lock held + */ +static void ioat2_update_pending(struct ioat2_dma_chan *ioat) +{ + if (unlikely(ioat->pending == 2)) + return; + else if (ioat2_ring_pending(ioat) > ioat_pending_level) + __ioat2_issue_pending(ioat); + else + ioat->pending = 1; +} + +static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) +{ + struct ioat_ring_ent *desc; + struct ioat_dma_descriptor *hw; + int idx; + + if (ioat2_ring_space(ioat) < 1) { + dev_err(to_dev(&ioat->base), + "Unable to start null desc - ring full\n"); + return; + } + + dev_dbg(to_dev(&ioat->base), "%s: head: %#x tail: %#x issued: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued); + idx = ioat2_desc_alloc(ioat, 1); + desc = ioat2_get_ring_ent(ioat, idx); + + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.compl_write = 1; + /* set size to non-zero value (channel returns error when size is 0) */ + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; + async_tx_ack(&desc->txd); + ioat2_set_chainaddr(ioat, desc->txd.phys); + dump_desc_dbg(ioat, desc); + __ioat2_issue_pending(ioat); +} + +static void ioat2_start_null_desc(struct ioat2_dma_chan *ioat) +{ + spin_lock_bh(&ioat->ring_lock); + __ioat2_start_null_desc(ioat); + spin_unlock_bh(&ioat->ring_lock); +} + +static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete) +{ + struct ioat_chan_common *chan = &ioat->base; + struct dma_async_tx_descriptor *tx; + struct ioat_ring_ent *desc; + bool seen_current = false; + u16 active; + int i; + + dev_dbg(to_dev(chan), "%s: head: %#x tail: %#x issued: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued); + + active = ioat2_ring_active(ioat); + for (i = 0; i < active && !seen_current; i++) { + prefetch(ioat2_get_ring_ent(ioat, ioat->tail + i + 1)); + desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + tx = &desc->txd; + dump_desc_dbg(ioat, desc); + if (tx->cookie) { + ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); + chan->completed_cookie = tx->cookie; + tx->cookie = 0; + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + + if (tx->phys == phys_complete) + seen_current = true; + } + ioat->tail += i; + BUG_ON(!seen_current); /* no active descs have written a completion? */ + + chan->last_completion = phys_complete; + if (ioat->head == ioat->tail) { + dev_dbg(to_dev(chan), "%s: cancel completion timeout\n", + __func__); + clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + } +} + +/** + * ioat2_cleanup - clean finished descriptors (advance tail pointer) + * @chan: ioat channel to be cleaned up + */ +static void ioat2_cleanup(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + + prefetch(chan->completion); + + if (!spin_trylock_bh(&chan->cleanup_lock)) + return; + + if (!ioat_cleanup_preamble(chan, &phys_complete)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + if (!spin_trylock_bh(&ioat->ring_lock)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + __cleanup(ioat, phys_complete); + + spin_unlock_bh(&ioat->ring_lock); + spin_unlock_bh(&chan->cleanup_lock); +} + +static void ioat2_cleanup_tasklet(unsigned long data) +{ + struct ioat2_dma_chan *ioat = (void *) data; + + ioat2_cleanup(ioat); + writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); +} + +static void __restart_chan(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + + /* set the tail to be re-issued */ + ioat->issued = ioat->tail; + ioat->dmacount = 0; + set_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + dev_dbg(to_dev(chan), + "%s: head: %#x tail: %#x issued: %#x count: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); + + if (ioat2_ring_pending(ioat)) { + struct ioat_ring_ent *desc; + + desc = ioat2_get_ring_ent(ioat, ioat->tail); + ioat2_set_chainaddr(ioat, desc->txd.phys); + __ioat2_issue_pending(ioat); + } else + __ioat2_start_null_desc(ioat); +} + +static void ioat2_restart_channel(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + unsigned long phys_complete; + u32 status; + + status = ioat_chansts(chan); + if (is_ioat_active(status) || is_ioat_idle(status)) + ioat_suspend(chan); + while (is_ioat_active(status) || is_ioat_idle(status)) { + status = ioat_chansts(chan); + cpu_relax(); + } + + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + + __restart_chan(ioat); +} + +static bool reshape_ring(struct ioat2_dma_chan *ioat, int order); + +static void ioat2_timer_event(unsigned long data) +{ + struct ioat2_dma_chan *ioat = (void *) data; + struct ioat_chan_common *chan = &ioat->base; + + spin_lock_bh(&chan->cleanup_lock); + if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) { + unsigned long phys_complete; + u64 status; + + spin_lock_bh(&ioat->ring_lock); + status = ioat_chansts(chan); + + /* when halted due to errors check for channel + * programming errors before advancing the completion state + */ + if (is_ioat_halted(status)) { + u32 chanerr; + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + BUG_ON(is_ioat_bug(chanerr)); + } + + /* if we haven't made progress and we have already + * acknowledged a pending completion once, then be more + * forceful with a restart + */ + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) + ioat2_restart_channel(ioat); + else { + set_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + } + spin_unlock_bh(&ioat->ring_lock); + } else { + u16 active; + + /* if the ring is idle, empty, and oversized try to step + * down the size + */ + spin_lock_bh(&ioat->ring_lock); + active = ioat2_ring_active(ioat); + if (active == 0 && ioat->alloc_order > ioat_get_alloc_order()) + reshape_ring(ioat, ioat->alloc_order-1); + spin_unlock_bh(&ioat->ring_lock); + + /* keep shrinking until we get back to our minimum + * default size + */ + if (ioat->alloc_order > ioat_get_alloc_order()) + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + } + spin_unlock_bh(&chan->cleanup_lock); +} + +/** + * ioat2_enumerate_channels - find and initialize the device's channels + * @device: the device to be enumerated + */ +static int ioat2_enumerate_channels(struct ioatdma_device *device) +{ + struct ioat2_dma_chan *ioat; + struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; + u8 xfercap_log; + int i; + + INIT_LIST_HEAD(&dma->channels); + dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + dma->chancnt &= 0x1f; /* bits [4:0] valid */ + if (dma->chancnt > ARRAY_SIZE(device->idx)) { + dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", + dma->chancnt, ARRAY_SIZE(device->idx)); + dma->chancnt = ARRAY_SIZE(device->idx); + } + xfercap_log = readb(device->reg_base + IOAT_XFERCAP_OFFSET); + xfercap_log &= 0x1f; /* bits [4:0] valid */ + if (xfercap_log == 0) + return 0; + dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log); + + /* FIXME which i/oat version is i7300? */ +#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL + if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) + dma->chancnt--; +#endif + for (i = 0; i < dma->chancnt; i++) { + ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); + if (!ioat) + break; + + ioat_init_channel(device, &ioat->base, i, + ioat2_timer_event, + ioat2_cleanup_tasklet, + (unsigned long) ioat); + ioat->xfercap_log = xfercap_log; + spin_lock_init(&ioat->ring_lock); + } + dma->chancnt = i; + return i; +} + +static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx) +{ + struct dma_chan *c = tx->chan; + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + dma_cookie_t cookie = c->cookie; + + cookie++; + if (cookie < 0) + cookie = 1; + tx->cookie = cookie; + c->cookie = cookie; + dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); + + if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state)) + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + ioat2_update_pending(ioat); + spin_unlock_bh(&ioat->ring_lock); + + return cookie; +} + +static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan, gfp_t flags) +{ + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *desc; + struct ioatdma_device *dma; + dma_addr_t phys; + + dma = to_ioatdma_device(chan->device); + hw = pci_pool_alloc(dma->dma_pool, flags, &phys); + if (!hw) + return NULL; + memset(hw, 0, sizeof(*hw)); + + desc = kzalloc(sizeof(*desc), flags); + if (!desc) { + pci_pool_free(dma->dma_pool, hw, phys); + return NULL; + } + + dma_async_tx_descriptor_init(&desc->txd, chan); + desc->txd.tx_submit = ioat2_tx_submit_unlock; + desc->hw = hw; + desc->txd.phys = phys; + return desc; +} + +static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan) +{ + struct ioatdma_device *dma; + + dma = to_ioatdma_device(chan->device); + pci_pool_free(dma->dma_pool, desc->hw, desc->txd.phys); + kfree(desc); +} + +static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gfp_t flags) +{ + struct ioat_ring_ent **ring; + int descs = 1 << order; + int i; + + if (order > ioat_get_max_alloc_order()) + return NULL; + + /* allocate the array to hold the software ring */ + ring = kcalloc(descs, sizeof(*ring), flags); + if (!ring) + return NULL; + for (i = 0; i < descs; i++) { + ring[i] = ioat2_alloc_ring_ent(c, flags); + if (!ring[i]) { + while (i--) + ioat2_free_ring_ent(ring[i], c); + kfree(ring); + return NULL; + } + set_desc_id(ring[i], i); + } + + /* link descs */ + for (i = 0; i < descs-1; i++) { + struct ioat_ring_ent *next = ring[i+1]; + struct ioat_dma_descriptor *hw = ring[i]->hw; + + hw->next = next->txd.phys; + } + ring[i]->hw->next = ring[0]->txd.phys; + + return ring; +} + +/* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring + * @chan: channel to be initialized + */ +static int ioat2_alloc_chan_resources(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_ring_ent **ring; + u32 chanerr; + int order; + + /* have we already been set up? */ + if (ioat->ring) + return 1 << ioat->alloc_order; + + /* Setup register to interrupt and write completion status on error */ + writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + if (chanerr) { + dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + } + + /* allocate a completion writeback area */ + /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ + chan->completion = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, &chan->completion_dma); + if (!chan->completion) + return -ENOMEM; + + memset(chan->completion, 0, sizeof(*chan->completion)); + writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); + writel(((u64) chan->completion_dma) >> 32, + chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); + + order = ioat_get_alloc_order(); + ring = ioat2_alloc_ring(c, order, GFP_KERNEL); + if (!ring) + return -ENOMEM; + + spin_lock_bh(&ioat->ring_lock); + ioat->ring = ring; + ioat->head = 0; + ioat->issued = 0; + ioat->tail = 0; + ioat->pending = 0; + ioat->alloc_order = order; + spin_unlock_bh(&ioat->ring_lock); + + tasklet_enable(&chan->cleanup_task); + ioat2_start_null_desc(ioat); + + return 1 << ioat->alloc_order; +} + +static bool reshape_ring(struct ioat2_dma_chan *ioat, int order) +{ + /* reshape differs from normal ring allocation in that we want + * to allocate a new software ring while only + * extending/truncating the hardware ring + */ + struct ioat_chan_common *chan = &ioat->base; + struct dma_chan *c = &chan->common; + const u16 curr_size = ioat2_ring_mask(ioat) + 1; + const u16 active = ioat2_ring_active(ioat); + const u16 new_size = 1 << order; + struct ioat_ring_ent **ring; + u16 i; + + if (order > ioat_get_max_alloc_order()) + return false; + + /* double check that we have at least 1 free descriptor */ + if (active == curr_size) + return false; + + /* when shrinking, verify that we can hold the current active + * set in the new ring + */ + if (active >= new_size) + return false; + + /* allocate the array to hold the software ring */ + ring = kcalloc(new_size, sizeof(*ring), GFP_NOWAIT); + if (!ring) + return false; + + /* allocate/trim descriptors as needed */ + if (new_size > curr_size) { + /* copy current descriptors to the new ring */ + for (i = 0; i < curr_size; i++) { + u16 curr_idx = (ioat->tail+i) & (curr_size-1); + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat->ring[curr_idx]; + set_desc_id(ring[new_idx], new_idx); + } + + /* add new descriptors to the ring */ + for (i = curr_size; i < new_size; i++) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat2_alloc_ring_ent(c, GFP_NOWAIT); + if (!ring[new_idx]) { + while (i--) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ioat2_free_ring_ent(ring[new_idx], c); + } + kfree(ring); + return false; + } + set_desc_id(ring[new_idx], new_idx); + } + + /* hw link new descriptors */ + for (i = curr_size-1; i < new_size; i++) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + struct ioat_ring_ent *next = ring[(new_idx+1) & (new_size-1)]; + struct ioat_dma_descriptor *hw = ring[new_idx]->hw; + + hw->next = next->txd.phys; + } + } else { + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *next; + + /* copy current descriptors to the new ring, dropping the + * removed descriptors + */ + for (i = 0; i < new_size; i++) { + u16 curr_idx = (ioat->tail+i) & (curr_size-1); + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat->ring[curr_idx]; + set_desc_id(ring[new_idx], new_idx); + } + + /* free deleted descriptors */ + for (i = new_size; i < curr_size; i++) { + struct ioat_ring_ent *ent; + + ent = ioat2_get_ring_ent(ioat, ioat->tail+i); + ioat2_free_ring_ent(ent, c); + } + + /* fix up hardware ring */ + hw = ring[(ioat->tail+new_size-1) & (new_size-1)]->hw; + next = ring[(ioat->tail+new_size) & (new_size-1)]; + hw->next = next->txd.phys; + } + + dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n", + __func__, new_size); + + kfree(ioat->ring); + ioat->ring = ring; + ioat->alloc_order = order; + + return true; +} + +/** + * ioat2_alloc_and_lock - common descriptor alloc boilerplate for ioat2,3 ops + * @idx: gets starting descriptor index on successful allocation + * @ioat: ioat2,3 channel (ring) to operate on + * @num_descs: allocation length + */ +static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs) +{ + struct ioat_chan_common *chan = &ioat->base; + + spin_lock_bh(&ioat->ring_lock); + /* never allow the last descriptor to be consumed, we need at + * least one free at all times to allow for on-the-fly ring + * resizing. + */ + while (unlikely(ioat2_ring_space(ioat) <= num_descs)) { + if (reshape_ring(ioat, ioat->alloc_order + 1) && + ioat2_ring_space(ioat) > num_descs) + break; + + if (printk_ratelimit()) + dev_dbg(to_dev(chan), + "%s: ring full! num_descs: %d (%x:%x:%x)\n", + __func__, num_descs, ioat->head, ioat->tail, + ioat->issued); + spin_unlock_bh(&ioat->ring_lock); + + /* progress reclaim in the allocation failure case we + * may be called under bh_disabled so we need to trigger + * the timer event directly + */ + spin_lock_bh(&chan->cleanup_lock); + if (jiffies > chan->timer.expires && + timer_pending(&chan->timer)) { + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + spin_unlock_bh(&chan->cleanup_lock); + ioat2_timer_event((unsigned long) ioat); + } else + spin_unlock_bh(&chan->cleanup_lock); + return -ENOMEM; + } + + dev_dbg(to_dev(chan), "%s: num_descs: %d (%x:%x:%x)\n", + __func__, num_descs, ioat->head, ioat->tail, ioat->issued); + + *idx = ioat2_desc_alloc(ioat, num_descs); + return 0; /* with ioat->ring_lock held */ +} + +static struct dma_async_tx_descriptor * +ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *desc; + dma_addr_t dst = dma_dest; + dma_addr_t src = dma_src; + size_t total_len = len; + int num_descs; + u16 idx; + int i; + + num_descs = ioat2_xferlen_to_descs(ioat, len); + if (likely(num_descs) && + ioat2_alloc_and_lock(&idx, ioat, num_descs) == 0) + /* pass */; + else + return NULL; + for (i = 0; i < num_descs; i++) { + size_t copy = min_t(size_t, len, 1 << ioat->xfercap_log); + + desc = ioat2_get_ring_ent(ioat, idx + i); + hw = desc->hw; + + hw->size = copy; + hw->ctl = 0; + hw->src_addr = src; + hw->dst_addr = dst; + + len -= copy; + dst += copy; + src += copy; + dump_desc_dbg(ioat, desc); + } + + desc->txd.flags = flags; + desc->len = total_len; + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + dump_desc_dbg(ioat, desc); + /* we leave the channel locked to ensure in order submission */ + + return &desc->txd; +} + +/** + * ioat2_free_chan_resources - release all the descriptors + * @chan: the channel to be cleaned + */ +static void ioat2_free_chan_resources(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *ioatdma_device = chan->device; + struct ioat_ring_ent *desc; + const u16 total_descs = 1 << ioat->alloc_order; + int descs; + int i; + + /* Before freeing channel resources first check + * if they have been previously allocated for this channel. + */ + if (!ioat->ring) + return; + + tasklet_disable(&chan->cleanup_task); + del_timer_sync(&chan->timer); + ioat2_cleanup(ioat); + + /* Delay 100ms after reset to allow internal DMA logic to quiesce + * before removing DMA descriptor resources. + */ + writeb(IOAT_CHANCMD_RESET, + chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); + mdelay(100); + + spin_lock_bh(&ioat->ring_lock); + descs = ioat2_ring_space(ioat); + dev_dbg(to_dev(chan), "freeing %d idle descriptors\n", descs); + for (i = 0; i < descs; i++) { + desc = ioat2_get_ring_ent(ioat, ioat->head + i); + ioat2_free_ring_ent(desc, c); + } + + if (descs < total_descs) + dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", + total_descs - descs); + + for (i = 0; i < total_descs - descs; i++) { + desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + dump_desc_dbg(ioat, desc); + ioat2_free_ring_ent(desc, c); + } + + kfree(ioat->ring); + ioat->ring = NULL; + ioat->alloc_order = 0; + pci_pool_free(ioatdma_device->completion_pool, + chan->completion, + chan->completion_dma); + spin_unlock_bh(&ioat->ring_lock); + + chan->last_completion = 0; + chan->completion_dma = 0; + ioat->pending = 0; + ioat->dmacount = 0; +} + +static enum dma_status +ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie, + dma_cookie_t *done, dma_cookie_t *used) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) + return DMA_SUCCESS; + + ioat2_cleanup(ioat); + + return ioat_is_complete(c, cookie, done, used); +} + +int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + int err; + + device->enumerate_channels = ioat2_enumerate_channels; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + dma->device_is_tx_complete = ioat2_is_complete; + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(2048); + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat2_dca_init(pdev, device->reg_base); + + return err; +} + +int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + int err; + u16 dev_id; + + device->enumerate_channels = ioat2_enumerate_channels; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + dma->device_is_tx_complete = ioat2_is_complete; + + /* -= IOAT ver.3 workarounds =- */ + /* Write CHANERRMSK_INT with 3E07h to mask out the errors + * that can cause stability issues for IOAT ver.3 + */ + pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07); + + /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit + * (workaround for spurious config parity error after restart) + */ + pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); + if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) + pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10); + + err = ioat_probe(device); + if (err) + return err; + ioat_set_tcp_copy_break(262144); + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + if (dca) + device->dca = ioat3_dca_init(pdev, device->reg_base); + + return err; +} diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h new file mode 100644 index 00000000000..9baa3d6065f --- /dev/null +++ b/drivers/dma/ioat/dma_v2.h @@ -0,0 +1,146 @@ +/* + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 + * Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#ifndef IOATDMA_V2_H +#define IOATDMA_V2_H + +#include <linux/dmaengine.h> +#include "dma.h" +#include "hw.h" + + +extern int ioat_pending_level; + +/* + * workaround for IOAT ver.3.0 null descriptor issue + * (channel returns error when size is 0) + */ +#define NULL_DESC_BUFFER_SIZE 1 + +#define IOAT_MAX_ORDER 16 +#define ioat_get_alloc_order() \ + (min(ioat_ring_alloc_order, IOAT_MAX_ORDER)) +#define ioat_get_max_alloc_order() \ + (min(ioat_ring_max_alloc_order, IOAT_MAX_ORDER)) + +/* struct ioat2_dma_chan - ioat v2 / v3 channel attributes + * @base: common ioat channel parameters + * @xfercap_log; log2 of channel max transfer length (for fast division) + * @head: allocated index + * @issued: hardware notification point + * @tail: cleanup index + * @pending: lock free indicator for issued != head + * @dmacount: identical to 'head' except for occasionally resetting to zero + * @alloc_order: log2 of the number of allocated descriptors + * @ring: software ring buffer implementation of hardware ring + * @ring_lock: protects ring attributes + */ +struct ioat2_dma_chan { + struct ioat_chan_common base; + size_t xfercap_log; + u16 head; + u16 issued; + u16 tail; + u16 dmacount; + u16 alloc_order; + int pending; + struct ioat_ring_ent **ring; + spinlock_t ring_lock; +}; + +static inline struct ioat2_dma_chan *to_ioat2_chan(struct dma_chan *c) +{ + struct ioat_chan_common *chan = to_chan_common(c); + + return container_of(chan, struct ioat2_dma_chan, base); +} + +static inline u16 ioat2_ring_mask(struct ioat2_dma_chan *ioat) +{ + return (1 << ioat->alloc_order) - 1; +} + +/* count of descriptors in flight with the engine */ +static inline u16 ioat2_ring_active(struct ioat2_dma_chan *ioat) +{ + return (ioat->head - ioat->tail) & ioat2_ring_mask(ioat); +} + +/* count of descriptors pending submission to hardware */ +static inline u16 ioat2_ring_pending(struct ioat2_dma_chan *ioat) +{ + return (ioat->head - ioat->issued) & ioat2_ring_mask(ioat); +} + +static inline u16 ioat2_ring_space(struct ioat2_dma_chan *ioat) +{ + u16 num_descs = ioat2_ring_mask(ioat) + 1; + u16 active = ioat2_ring_active(ioat); + + BUG_ON(active > num_descs); + + return num_descs - active; +} + +/* assumes caller already checked space */ +static inline u16 ioat2_desc_alloc(struct ioat2_dma_chan *ioat, u16 len) +{ + ioat->head += len; + return ioat->head - len; +} + +static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len) +{ + u16 num_descs = len >> ioat->xfercap_log; + + num_descs += !!(len & ((1 << ioat->xfercap_log) - 1)); + return num_descs; +} + +struct ioat_ring_ent { + struct ioat_dma_descriptor *hw; + struct dma_async_tx_descriptor txd; + size_t len; + #ifdef DEBUG + int id; + #endif +}; + +static inline struct ioat_ring_ent * +ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx) +{ + return ioat->ring[idx & ioat2_ring_mask(ioat)]; +} + +static inline void ioat2_set_chainaddr(struct ioat2_dma_chan *ioat, u64 addr) +{ + struct ioat_chan_common *chan = &ioat->base; + + writel(addr & 0x00000000FFFFFFFF, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + writel(addr >> 32, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); +} + +int __devinit ioat2_dma_probe(struct ioatdma_device *dev, int dca); +int __devinit ioat3_dma_probe(struct ioatdma_device *dev, int dca); +struct dca_provider * __devinit ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); +struct dca_provider * __devinit ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +#endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioatdma_hw.h b/drivers/dma/ioat/hw.h index afa57eef86c..7481fb13ce0 100644 --- a/drivers/dma/ioatdma_hw.h +++ b/drivers/dma/ioat/hw.h @@ -23,6 +23,7 @@ /* PCI Configuration Space Values */ #define IOAT_PCI_VID 0x8086 +#define IOAT_MMIO_BAR 0 /* CB device ID's */ #define IOAT_PCI_DID_5000 0x1A38 @@ -39,32 +40,34 @@ struct ioat_dma_descriptor { uint32_t size; - uint32_t ctl; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int null:1; + unsigned int src_brk:1; + unsigned int dest_brk:1; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int rsvd2:13; + unsigned int op:8; + } ctl_f; + }; uint64_t src_addr; uint64_t dst_addr; uint64_t next; uint64_t rsv1; uint64_t rsv2; - uint64_t user1; + /* store some driver data in an unused portion of the descriptor */ + union { + uint64_t user1; + uint64_t tx_cnt; + }; uint64_t user2; }; - -#define IOAT_DMA_DESCRIPTOR_CTL_INT_GN 0x00000001 -#define IOAT_DMA_DESCRIPTOR_CTL_SRC_SN 0x00000002 -#define IOAT_DMA_DESCRIPTOR_CTL_DST_SN 0x00000004 -#define IOAT_DMA_DESCRIPTOR_CTL_CP_STS 0x00000008 -#define IOAT_DMA_DESCRIPTOR_CTL_FRAME 0x00000010 -#define IOAT_DMA_DESCRIPTOR_NUL 0x00000020 -#define IOAT_DMA_DESCRIPTOR_CTL_SP_BRK 0x00000040 -#define IOAT_DMA_DESCRIPTOR_CTL_DP_BRK 0x00000080 -#define IOAT_DMA_DESCRIPTOR_CTL_BNDL 0x00000100 -#define IOAT_DMA_DESCRIPTOR_CTL_DCA 0x00000200 -#define IOAT_DMA_DESCRIPTOR_CTL_BUFHINT 0x00000400 - -#define IOAT_DMA_DESCRIPTOR_CTL_OPCODE_CONTEXT 0xFF000000 -#define IOAT_DMA_DESCRIPTOR_CTL_OPCODE_DMA 0x00000000 - -#define IOAT_DMA_DESCRIPTOR_CTL_CONTEXT_DCA 0x00000001 -#define IOAT_DMA_DESCRIPTOR_CTL_OPCODE_MASK 0xFF000000 - #endif diff --git a/drivers/dma/ioat.c b/drivers/dma/ioat/pci.c index 2225bb6ba3d..c4e43226925 100644 --- a/drivers/dma/ioat.c +++ b/drivers/dma/ioat/pci.c @@ -30,9 +30,10 @@ #include <linux/pci.h> #include <linux/interrupt.h> #include <linux/dca.h> -#include "ioatdma.h" -#include "ioatdma_registers.h" -#include "ioatdma_hw.h" +#include "dma.h" +#include "dma_v2.h" +#include "registers.h" +#include "hw.h" MODULE_VERSION(IOAT_DMA_VERSION); MODULE_LICENSE("GPL"); @@ -60,119 +61,101 @@ static struct pci_device_id ioat_pci_tbl[] = { { 0, } }; -struct ioat_device { - struct pci_dev *pdev; - void __iomem *iobase; - struct ioatdma_device *dma; - struct dca_provider *dca; -}; - -static int __devinit ioat_probe(struct pci_dev *pdev, - const struct pci_device_id *id); +static int __devinit ioat_pci_probe(struct pci_dev *pdev, + const struct pci_device_id *id); static void __devexit ioat_remove(struct pci_dev *pdev); static int ioat_dca_enabled = 1; module_param(ioat_dca_enabled, int, 0644); MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); +#define DRV_NAME "ioatdma" + static struct pci_driver ioat_pci_driver = { - .name = "ioatdma", + .name = DRV_NAME, .id_table = ioat_pci_tbl, - .probe = ioat_probe, + .probe = ioat_pci_probe, .remove = __devexit_p(ioat_remove), }; -static int __devinit ioat_probe(struct pci_dev *pdev, - const struct pci_device_id *id) +static struct ioatdma_device * +alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase) { - void __iomem *iobase; - struct ioat_device *device; - unsigned long mmio_start, mmio_len; + struct device *dev = &pdev->dev; + struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL); + + if (!d) + return NULL; + d->pdev = pdev; + d->reg_base = iobase; + return d; +} + +static int __devinit ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + void __iomem * const *iomap; + struct device *dev = &pdev->dev; + struct ioatdma_device *device; int err; - err = pci_enable_device(pdev); + err = pcim_enable_device(pdev); if (err) - goto err_enable_device; + return err; - err = pci_request_regions(pdev, ioat_pci_driver.name); + err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME); if (err) - goto err_request_regions; + return err; + iomap = pcim_iomap_table(pdev); + if (!iomap) + return -ENOMEM; err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); if (err) err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); if (err) - goto err_set_dma_mask; + return err; err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); if (err) err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); if (err) - goto err_set_dma_mask; - - mmio_start = pci_resource_start(pdev, 0); - mmio_len = pci_resource_len(pdev, 0); - iobase = ioremap(mmio_start, mmio_len); - if (!iobase) { - err = -ENOMEM; - goto err_ioremap; - } + return err; - device = kzalloc(sizeof(*device), GFP_KERNEL); - if (!device) { - err = -ENOMEM; - goto err_kzalloc; - } - device->pdev = pdev; - pci_set_drvdata(pdev, device); - device->iobase = iobase; + device = devm_kzalloc(dev, sizeof(*device), GFP_KERNEL); + if (!device) + return -ENOMEM; pci_set_master(pdev); - switch (readb(iobase + IOAT_VER_OFFSET)) { - case IOAT_VER_1_2: - device->dma = ioat_dma_probe(pdev, iobase); - if (device->dma && ioat_dca_enabled) - device->dca = ioat_dca_init(pdev, iobase); - break; - case IOAT_VER_2_0: - device->dma = ioat_dma_probe(pdev, iobase); - if (device->dma && ioat_dca_enabled) - device->dca = ioat2_dca_init(pdev, iobase); - break; - case IOAT_VER_3_0: - device->dma = ioat_dma_probe(pdev, iobase); - if (device->dma && ioat_dca_enabled) - device->dca = ioat3_dca_init(pdev, iobase); - break; - default: - err = -ENODEV; - break; - } - if (!device->dma) - err = -ENODEV; + device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]); + if (!device) + return -ENOMEM; + pci_set_drvdata(pdev, device); - if (err) - goto err_version; + device->version = readb(device->reg_base + IOAT_VER_OFFSET); + if (device->version == IOAT_VER_1_2) + err = ioat1_dma_probe(device, ioat_dca_enabled); + else if (device->version == IOAT_VER_2_0) + err = ioat2_dma_probe(device, ioat_dca_enabled); + else if (device->version >= IOAT_VER_3_0) + err = ioat3_dma_probe(device, ioat_dca_enabled); + else + return -ENODEV; + + if (err) { + dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n"); + return -ENODEV; + } return 0; - -err_version: - kfree(device); -err_kzalloc: - iounmap(iobase); -err_ioremap: -err_set_dma_mask: - pci_release_regions(pdev); - pci_disable_device(pdev); -err_request_regions: -err_enable_device: - return err; } static void __devexit ioat_remove(struct pci_dev *pdev) { - struct ioat_device *device = pci_get_drvdata(pdev); + struct ioatdma_device *device = pci_get_drvdata(pdev); + + if (!device) + return; dev_err(&pdev->dev, "Removing dma and dca services\n"); if (device->dca) { @@ -180,13 +163,7 @@ static void __devexit ioat_remove(struct pci_dev *pdev) free_dca_provider(device->dca); device->dca = NULL; } - - if (device->dma) { - ioat_dma_remove(device->dma); - device->dma = NULL; - } - - kfree(device); + ioat_dma_remove(device); } static int __init ioat_init_module(void) diff --git a/drivers/dma/ioatdma_registers.h b/drivers/dma/ioat/registers.h index 49bc277424f..e4334a19538 100644 --- a/drivers/dma/ioatdma_registers.h +++ b/drivers/dma/ioat/registers.h @@ -75,7 +75,11 @@ #define IOAT_CHANCTRL_ERR_INT_EN 0x0010 #define IOAT_CHANCTRL_ANY_ERR_ABORT_EN 0x0008 #define IOAT_CHANCTRL_ERR_COMPLETION_EN 0x0004 -#define IOAT_CHANCTRL_INT_DISABLE 0x0001 +#define IOAT_CHANCTRL_INT_REARM 0x0001 +#define IOAT_CHANCTRL_RUN (IOAT_CHANCTRL_INT_REARM |\ + IOAT_CHANCTRL_ERR_COMPLETION_EN |\ + IOAT_CHANCTRL_ANY_ERR_ABORT_EN |\ + IOAT_CHANCTRL_ERR_INT_EN) #define IOAT_DMA_COMP_OFFSET 0x02 /* 16-bit DMA channel compatibility */ #define IOAT_DMA_COMP_V1 0x0001 /* Compatibility with DMA version 1 */ @@ -94,14 +98,14 @@ #define IOAT2_CHANSTS_OFFSET_HIGH 0x0C #define IOAT_CHANSTS_OFFSET_HIGH(ver) ((ver) < IOAT_VER_2_0 \ ? IOAT1_CHANSTS_OFFSET_HIGH : IOAT2_CHANSTS_OFFSET_HIGH) -#define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR ~0x3F -#define IOAT_CHANSTS_SOFT_ERR 0x0000000000000010 -#define IOAT_CHANSTS_UNAFFILIATED_ERR 0x0000000000000008 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS 0x0000000000000007 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS_ACTIVE 0x0 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS_DONE 0x1 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS_SUSPENDED 0x2 -#define IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED 0x3 +#define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR (~0x3fULL) +#define IOAT_CHANSTS_SOFT_ERR 0x10ULL +#define IOAT_CHANSTS_UNAFFILIATED_ERR 0x8ULL +#define IOAT_CHANSTS_STATUS 0x7ULL +#define IOAT_CHANSTS_ACTIVE 0x0 +#define IOAT_CHANSTS_DONE 0x1 +#define IOAT_CHANSTS_SUSPENDED 0x2 +#define IOAT_CHANSTS_HALTED 0x3 @@ -204,18 +208,18 @@ #define IOAT_CDAR_OFFSET_HIGH 0x24 #define IOAT_CHANERR_OFFSET 0x28 /* 32-bit Channel Error Register */ -#define IOAT_CHANERR_DMA_TRANSFER_SRC_ADDR_ERR 0x0001 -#define IOAT_CHANERR_DMA_TRANSFER_DEST_ADDR_ERR 0x0002 -#define IOAT_CHANERR_NEXT_DESCRIPTOR_ADDR_ERR 0x0004 -#define IOAT_CHANERR_NEXT_DESCRIPTOR_ALIGNMENT_ERR 0x0008 +#define IOAT_CHANERR_SRC_ADDR_ERR 0x0001 +#define IOAT_CHANERR_DEST_ADDR_ERR 0x0002 +#define IOAT_CHANERR_NEXT_ADDR_ERR 0x0004 +#define IOAT_CHANERR_NEXT_DESC_ALIGN_ERR 0x0008 #define IOAT_CHANERR_CHAIN_ADDR_VALUE_ERR 0x0010 #define IOAT_CHANERR_CHANCMD_ERR 0x0020 #define IOAT_CHANERR_CHIPSET_UNCORRECTABLE_DATA_INTEGRITY_ERR 0x0040 #define IOAT_CHANERR_DMA_UNCORRECTABLE_DATA_INTEGRITY_ERR 0x0080 #define IOAT_CHANERR_READ_DATA_ERR 0x0100 #define IOAT_CHANERR_WRITE_DATA_ERR 0x0200 -#define IOAT_CHANERR_DESCRIPTOR_CONTROL_ERR 0x0400 -#define IOAT_CHANERR_DESCRIPTOR_LENGTH_ERR 0x0800 +#define IOAT_CHANERR_CONTROL_ERR 0x0400 +#define IOAT_CHANERR_LENGTH_ERR 0x0800 #define IOAT_CHANERR_COMPLETION_ADDR_ERR 0x1000 #define IOAT_CHANERR_INT_CONFIGURATION_ERR 0x2000 #define IOAT_CHANERR_SOFT_ERR 0x4000 diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c deleted file mode 100644 index a600fc0f796..00000000000 --- a/drivers/dma/ioat_dma.c +++ /dev/null @@ -1,1741 +0,0 @@ -/* - * Intel I/OAT DMA Linux driver - * Copyright(c) 2004 - 2009 Intel Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. - * - * The full GNU General Public License is included in this distribution in - * the file called "COPYING". - * - */ - -/* - * This driver supports an Intel I/OAT DMA engine, which does asynchronous - * copy operations. - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/pci.h> -#include <linux/interrupt.h> -#include <linux/dmaengine.h> -#include <linux/delay.h> -#include <linux/dma-mapping.h> -#include <linux/workqueue.h> -#include <linux/i7300_idle.h> -#include "ioatdma.h" -#include "ioatdma_registers.h" -#include "ioatdma_hw.h" - -#define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common) -#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) -#define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) -#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, async_tx) - -#define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) -static int ioat_pending_level = 4; -module_param(ioat_pending_level, int, 0644); -MODULE_PARM_DESC(ioat_pending_level, - "high-water mark for pushing ioat descriptors (default: 4)"); - -#define RESET_DELAY msecs_to_jiffies(100) -#define WATCHDOG_DELAY round_jiffies(msecs_to_jiffies(2000)) -static void ioat_dma_chan_reset_part2(struct work_struct *work); -static void ioat_dma_chan_watchdog(struct work_struct *work); - -/* - * workaround for IOAT ver.3.0 null descriptor issue - * (channel returns error when size is 0) - */ -#define NULL_DESC_BUFFER_SIZE 1 - -/* internal functions */ -static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan); -static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan); - -static struct ioat_desc_sw * -ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan); -static struct ioat_desc_sw * -ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan); - -static inline struct ioat_dma_chan *ioat_lookup_chan_by_index( - struct ioatdma_device *device, - int index) -{ - return device->idx[index]; -} - -/** - * ioat_dma_do_interrupt - handler used for single vector interrupt mode - * @irq: interrupt id - * @data: interrupt data - */ -static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) -{ - struct ioatdma_device *instance = data; - struct ioat_dma_chan *ioat_chan; - unsigned long attnstatus; - int bit; - u8 intrctrl; - - intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET); - - if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN)) - return IRQ_NONE; - - if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) { - writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); - return IRQ_NONE; - } - - attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET); - for_each_bit(bit, &attnstatus, BITS_PER_LONG) { - ioat_chan = ioat_lookup_chan_by_index(instance, bit); - tasklet_schedule(&ioat_chan->cleanup_task); - } - - writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); - return IRQ_HANDLED; -} - -/** - * ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode - * @irq: interrupt id - * @data: interrupt data - */ -static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) -{ - struct ioat_dma_chan *ioat_chan = data; - - tasklet_schedule(&ioat_chan->cleanup_task); - - return IRQ_HANDLED; -} - -static void ioat_dma_cleanup_tasklet(unsigned long data); - -/** - * ioat_dma_enumerate_channels - find and initialize the device's channels - * @device: the device to be enumerated - */ -static int ioat_dma_enumerate_channels(struct ioatdma_device *device) -{ - u8 xfercap_scale; - u32 xfercap; - int i; - struct ioat_dma_chan *ioat_chan; - - /* - * IOAT ver.3 workarounds - */ - if (device->version == IOAT_VER_3_0) { - u32 chan_err_mask; - u16 dev_id; - u32 dmauncerrsts; - - /* - * Write CHANERRMSK_INT with 3E07h to mask out the errors - * that can cause stability issues for IOAT ver.3 - */ - chan_err_mask = 0x3E07; - pci_write_config_dword(device->pdev, - IOAT_PCI_CHANERRMASK_INT_OFFSET, - chan_err_mask); - - /* - * Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit - * (workaround for spurious config parity error after restart) - */ - pci_read_config_word(device->pdev, - IOAT_PCI_DEVICE_ID_OFFSET, - &dev_id); - if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) { - dmauncerrsts = 0x10; - pci_write_config_dword(device->pdev, - IOAT_PCI_DMAUNCERRSTS_OFFSET, - dmauncerrsts); - } - } - - device->common.chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); - xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET); - xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); - -#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL - if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) { - device->common.chancnt--; - } -#endif - for (i = 0; i < device->common.chancnt; i++) { - ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL); - if (!ioat_chan) { - device->common.chancnt = i; - break; - } - - ioat_chan->device = device; - ioat_chan->reg_base = device->reg_base + (0x80 * (i + 1)); - ioat_chan->xfercap = xfercap; - ioat_chan->desccount = 0; - INIT_DELAYED_WORK(&ioat_chan->work, ioat_dma_chan_reset_part2); - if (ioat_chan->device->version == IOAT_VER_2_0) - writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | - IOAT_DMA_DCA_ANY_CPU, - ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); - else if (ioat_chan->device->version == IOAT_VER_3_0) - writel(IOAT_DMA_DCA_ANY_CPU, - ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); - spin_lock_init(&ioat_chan->cleanup_lock); - spin_lock_init(&ioat_chan->desc_lock); - INIT_LIST_HEAD(&ioat_chan->free_desc); - INIT_LIST_HEAD(&ioat_chan->used_desc); - /* This should be made common somewhere in dmaengine.c */ - ioat_chan->common.device = &device->common; - list_add_tail(&ioat_chan->common.device_node, - &device->common.channels); - device->idx[i] = ioat_chan; - tasklet_init(&ioat_chan->cleanup_task, - ioat_dma_cleanup_tasklet, - (unsigned long) ioat_chan); - tasklet_disable(&ioat_chan->cleanup_task); - } - return device->common.chancnt; -} - -/** - * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended - * descriptors to hw - * @chan: DMA channel handle - */ -static inline void __ioat1_dma_memcpy_issue_pending( - struct ioat_dma_chan *ioat_chan) -{ - ioat_chan->pending = 0; - writeb(IOAT_CHANCMD_APPEND, ioat_chan->reg_base + IOAT1_CHANCMD_OFFSET); -} - -static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - - if (ioat_chan->pending > 0) { - spin_lock_bh(&ioat_chan->desc_lock); - __ioat1_dma_memcpy_issue_pending(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); - } -} - -static inline void __ioat2_dma_memcpy_issue_pending( - struct ioat_dma_chan *ioat_chan) -{ - ioat_chan->pending = 0; - writew(ioat_chan->dmacount, - ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); -} - -static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - - if (ioat_chan->pending > 0) { - spin_lock_bh(&ioat_chan->desc_lock); - __ioat2_dma_memcpy_issue_pending(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); - } -} - - -/** - * ioat_dma_chan_reset_part2 - reinit the channel after a reset - */ -static void ioat_dma_chan_reset_part2(struct work_struct *work) -{ - struct ioat_dma_chan *ioat_chan = - container_of(work, struct ioat_dma_chan, work.work); - struct ioat_desc_sw *desc; - - spin_lock_bh(&ioat_chan->cleanup_lock); - spin_lock_bh(&ioat_chan->desc_lock); - - ioat_chan->completion_virt->low = 0; - ioat_chan->completion_virt->high = 0; - ioat_chan->pending = 0; - - /* - * count the descriptors waiting, and be sure to do it - * right for both the CB1 line and the CB2 ring - */ - ioat_chan->dmacount = 0; - if (ioat_chan->used_desc.prev) { - desc = to_ioat_desc(ioat_chan->used_desc.prev); - do { - ioat_chan->dmacount++; - desc = to_ioat_desc(desc->node.next); - } while (&desc->node != ioat_chan->used_desc.next); - } - - /* - * write the new starting descriptor address - * this puts channel engine into ARMED state - */ - desc = to_ioat_desc(ioat_chan->used_desc.prev); - switch (ioat_chan->device->version) { - case IOAT_VER_1_2: - writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->async_tx.phys) >> 32, - ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - - writeb(IOAT_CHANCMD_START, ioat_chan->reg_base - + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); - break; - case IOAT_VER_2_0: - writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->async_tx.phys) >> 32, - ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); - - /* tell the engine to go with what's left to be done */ - writew(ioat_chan->dmacount, - ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); - - break; - } - dev_err(&ioat_chan->device->pdev->dev, - "chan%d reset - %d descs waiting, %d total desc\n", - chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); - - spin_unlock_bh(&ioat_chan->desc_lock); - spin_unlock_bh(&ioat_chan->cleanup_lock); -} - -/** - * ioat_dma_reset_channel - restart a channel - * @ioat_chan: IOAT DMA channel handle - */ -static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat_chan) -{ - u32 chansts, chanerr; - - if (!ioat_chan->used_desc.prev) - return; - - chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); - chansts = (ioat_chan->completion_virt->low - & IOAT_CHANSTS_DMA_TRANSFER_STATUS); - if (chanerr) { - dev_err(&ioat_chan->device->pdev->dev, - "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", - chan_num(ioat_chan), chansts, chanerr); - writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); - } - - /* - * whack it upside the head with a reset - * and wait for things to settle out. - * force the pending count to a really big negative - * to make sure no one forces an issue_pending - * while we're waiting. - */ - - spin_lock_bh(&ioat_chan->desc_lock); - ioat_chan->pending = INT_MIN; - writeb(IOAT_CHANCMD_RESET, - ioat_chan->reg_base - + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); - spin_unlock_bh(&ioat_chan->desc_lock); - - /* schedule the 2nd half instead of sleeping a long time */ - schedule_delayed_work(&ioat_chan->work, RESET_DELAY); -} - -/** - * ioat_dma_chan_watchdog - watch for stuck channels - */ -static void ioat_dma_chan_watchdog(struct work_struct *work) -{ - struct ioatdma_device *device = - container_of(work, struct ioatdma_device, work.work); - struct ioat_dma_chan *ioat_chan; - int i; - - union { - u64 full; - struct { - u32 low; - u32 high; - }; - } completion_hw; - unsigned long compl_desc_addr_hw; - - for (i = 0; i < device->common.chancnt; i++) { - ioat_chan = ioat_lookup_chan_by_index(device, i); - - if (ioat_chan->device->version == IOAT_VER_1_2 - /* have we started processing anything yet */ - && ioat_chan->last_completion - /* have we completed any since last watchdog cycle? */ - && (ioat_chan->last_completion == - ioat_chan->watchdog_completion) - /* has TCP stuck on one cookie since last watchdog? */ - && (ioat_chan->watchdog_tcp_cookie == - ioat_chan->watchdog_last_tcp_cookie) - && (ioat_chan->watchdog_tcp_cookie != - ioat_chan->completed_cookie) - /* is there something in the chain to be processed? */ - /* CB1 chain always has at least the last one processed */ - && (ioat_chan->used_desc.prev != ioat_chan->used_desc.next) - && ioat_chan->pending == 0) { - - /* - * check CHANSTS register for completed - * descriptor address. - * if it is different than completion writeback, - * it is not zero - * and it has changed since the last watchdog - * we can assume that channel - * is still working correctly - * and the problem is in completion writeback. - * update completion writeback - * with actual CHANSTS value - * else - * try resetting the channel - */ - - completion_hw.low = readl(ioat_chan->reg_base + - IOAT_CHANSTS_OFFSET_LOW(ioat_chan->device->version)); - completion_hw.high = readl(ioat_chan->reg_base + - IOAT_CHANSTS_OFFSET_HIGH(ioat_chan->device->version)); -#if (BITS_PER_LONG == 64) - compl_desc_addr_hw = - completion_hw.full - & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; -#else - compl_desc_addr_hw = - completion_hw.low & IOAT_LOW_COMPLETION_MASK; -#endif - - if ((compl_desc_addr_hw != 0) - && (compl_desc_addr_hw != ioat_chan->watchdog_completion) - && (compl_desc_addr_hw != ioat_chan->last_compl_desc_addr_hw)) { - ioat_chan->last_compl_desc_addr_hw = compl_desc_addr_hw; - ioat_chan->completion_virt->low = completion_hw.low; - ioat_chan->completion_virt->high = completion_hw.high; - } else { - ioat_dma_reset_channel(ioat_chan); - ioat_chan->watchdog_completion = 0; - ioat_chan->last_compl_desc_addr_hw = 0; - } - - /* - * for version 2.0 if there are descriptors yet to be processed - * and the last completed hasn't changed since the last watchdog - * if they haven't hit the pending level - * issue the pending to push them through - * else - * try resetting the channel - */ - } else if (ioat_chan->device->version == IOAT_VER_2_0 - && ioat_chan->used_desc.prev - && ioat_chan->last_completion - && ioat_chan->last_completion == ioat_chan->watchdog_completion) { - - if (ioat_chan->pending < ioat_pending_level) - ioat2_dma_memcpy_issue_pending(&ioat_chan->common); - else { - ioat_dma_reset_channel(ioat_chan); - ioat_chan->watchdog_completion = 0; - } - } else { - ioat_chan->last_compl_desc_addr_hw = 0; - ioat_chan->watchdog_completion - = ioat_chan->last_completion; - } - - ioat_chan->watchdog_last_tcp_cookie = - ioat_chan->watchdog_tcp_cookie; - } - - schedule_delayed_work(&device->work, WATCHDOG_DELAY); -} - -static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan); - struct ioat_desc_sw *first = tx_to_ioat_desc(tx); - struct ioat_desc_sw *prev, *new; - struct ioat_dma_descriptor *hw; - dma_cookie_t cookie; - LIST_HEAD(new_chain); - u32 copy; - size_t len; - dma_addr_t src, dst; - unsigned long orig_flags; - unsigned int desc_count = 0; - - /* src and dest and len are stored in the initial descriptor */ - len = first->len; - src = first->src; - dst = first->dst; - orig_flags = first->async_tx.flags; - new = first; - - spin_lock_bh(&ioat_chan->desc_lock); - prev = to_ioat_desc(ioat_chan->used_desc.prev); - prefetch(prev->hw); - do { - copy = min_t(size_t, len, ioat_chan->xfercap); - - async_tx_ack(&new->async_tx); - - hw = new->hw; - hw->size = copy; - hw->ctl = 0; - hw->src_addr = src; - hw->dst_addr = dst; - hw->next = 0; - - /* chain together the physical address list for the HW */ - wmb(); - prev->hw->next = (u64) new->async_tx.phys; - - len -= copy; - dst += copy; - src += copy; - - list_add_tail(&new->node, &new_chain); - desc_count++; - prev = new; - } while (len && (new = ioat1_dma_get_next_descriptor(ioat_chan))); - - if (!new) { - dev_err(&ioat_chan->device->pdev->dev, - "tx submit failed\n"); - spin_unlock_bh(&ioat_chan->desc_lock); - return -ENOMEM; - } - - hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS; - if (first->async_tx.callback) { - hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN; - if (first != new) { - /* move callback into to last desc */ - new->async_tx.callback = first->async_tx.callback; - new->async_tx.callback_param - = first->async_tx.callback_param; - first->async_tx.callback = NULL; - first->async_tx.callback_param = NULL; - } - } - - new->tx_cnt = desc_count; - new->async_tx.flags = orig_flags; /* client is in control of this ack */ - - /* store the original values for use in later cleanup */ - if (new != first) { - new->src = first->src; - new->dst = first->dst; - new->len = first->len; - } - - /* cookie incr and addition to used_list must be atomic */ - cookie = ioat_chan->common.cookie; - cookie++; - if (cookie < 0) - cookie = 1; - ioat_chan->common.cookie = new->async_tx.cookie = cookie; - - /* write address into NextDescriptor field of last desc in chain */ - to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = - first->async_tx.phys; - list_splice_tail(&new_chain, &ioat_chan->used_desc); - - ioat_chan->dmacount += desc_count; - ioat_chan->pending += desc_count; - if (ioat_chan->pending >= ioat_pending_level) - __ioat1_dma_memcpy_issue_pending(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); - - return cookie; -} - -static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan); - struct ioat_desc_sw *first = tx_to_ioat_desc(tx); - struct ioat_desc_sw *new; - struct ioat_dma_descriptor *hw; - dma_cookie_t cookie; - u32 copy; - size_t len; - dma_addr_t src, dst; - unsigned long orig_flags; - unsigned int desc_count = 0; - - /* src and dest and len are stored in the initial descriptor */ - len = first->len; - src = first->src; - dst = first->dst; - orig_flags = first->async_tx.flags; - new = first; - - /* - * ioat_chan->desc_lock is still in force in version 2 path - * it gets unlocked at end of this function - */ - do { - copy = min_t(size_t, len, ioat_chan->xfercap); - - async_tx_ack(&new->async_tx); - - hw = new->hw; - hw->size = copy; - hw->ctl = 0; - hw->src_addr = src; - hw->dst_addr = dst; - - len -= copy; - dst += copy; - src += copy; - desc_count++; - } while (len && (new = ioat2_dma_get_next_descriptor(ioat_chan))); - - if (!new) { - dev_err(&ioat_chan->device->pdev->dev, - "tx submit failed\n"); - spin_unlock_bh(&ioat_chan->desc_lock); - return -ENOMEM; - } - - hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_CP_STS; - if (first->async_tx.callback) { - hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN; - if (first != new) { - /* move callback into to last desc */ - new->async_tx.callback = first->async_tx.callback; - new->async_tx.callback_param - = first->async_tx.callback_param; - first->async_tx.callback = NULL; - first->async_tx.callback_param = NULL; - } - } - - new->tx_cnt = desc_count; - new->async_tx.flags = orig_flags; /* client is in control of this ack */ - - /* store the original values for use in later cleanup */ - if (new != first) { - new->src = first->src; - new->dst = first->dst; - new->len = first->len; - } - - /* cookie incr and addition to used_list must be atomic */ - cookie = ioat_chan->common.cookie; - cookie++; - if (cookie < 0) - cookie = 1; - ioat_chan->common.cookie = new->async_tx.cookie = cookie; - - ioat_chan->dmacount += desc_count; - ioat_chan->pending += desc_count; - if (ioat_chan->pending >= ioat_pending_level) - __ioat2_dma_memcpy_issue_pending(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); - - return cookie; -} - -/** - * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair - * @ioat_chan: the channel supplying the memory pool for the descriptors - * @flags: allocation flags - */ -static struct ioat_desc_sw *ioat_dma_alloc_descriptor( - struct ioat_dma_chan *ioat_chan, - gfp_t flags) -{ - struct ioat_dma_descriptor *desc; - struct ioat_desc_sw *desc_sw; - struct ioatdma_device *ioatdma_device; - dma_addr_t phys; - - ioatdma_device = to_ioatdma_device(ioat_chan->common.device); - desc = pci_pool_alloc(ioatdma_device->dma_pool, flags, &phys); - if (unlikely(!desc)) - return NULL; - - desc_sw = kzalloc(sizeof(*desc_sw), flags); - if (unlikely(!desc_sw)) { - pci_pool_free(ioatdma_device->dma_pool, desc, phys); - return NULL; - } - - memset(desc, 0, sizeof(*desc)); - dma_async_tx_descriptor_init(&desc_sw->async_tx, &ioat_chan->common); - switch (ioat_chan->device->version) { - case IOAT_VER_1_2: - desc_sw->async_tx.tx_submit = ioat1_tx_submit; - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - desc_sw->async_tx.tx_submit = ioat2_tx_submit; - break; - } - - desc_sw->hw = desc; - desc_sw->async_tx.phys = phys; - - return desc_sw; -} - -static int ioat_initial_desc_count = 256; -module_param(ioat_initial_desc_count, int, 0644); -MODULE_PARM_DESC(ioat_initial_desc_count, - "initial descriptors per channel (default: 256)"); - -/** - * ioat2_dma_massage_chan_desc - link the descriptors into a circle - * @ioat_chan: the channel to be massaged - */ -static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat_chan) -{ - struct ioat_desc_sw *desc, *_desc; - - /* setup used_desc */ - ioat_chan->used_desc.next = ioat_chan->free_desc.next; - ioat_chan->used_desc.prev = NULL; - - /* pull free_desc out of the circle so that every node is a hw - * descriptor, but leave it pointing to the list - */ - ioat_chan->free_desc.prev->next = ioat_chan->free_desc.next; - ioat_chan->free_desc.next->prev = ioat_chan->free_desc.prev; - - /* circle link the hw descriptors */ - desc = to_ioat_desc(ioat_chan->free_desc.next); - desc->hw->next = to_ioat_desc(desc->node.next)->async_tx.phys; - list_for_each_entry_safe(desc, _desc, ioat_chan->free_desc.next, node) { - desc->hw->next = to_ioat_desc(desc->node.next)->async_tx.phys; - } -} - -/** - * ioat_dma_alloc_chan_resources - returns the number of allocated descriptors - * @chan: the channel to be filled out - */ -static int ioat_dma_alloc_chan_resources(struct dma_chan *chan) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - struct ioat_desc_sw *desc; - u16 chanctrl; - u32 chanerr; - int i; - LIST_HEAD(tmp_list); - - /* have we already been set up? */ - if (!list_empty(&ioat_chan->free_desc)) - return ioat_chan->desccount; - - /* Setup register to interrupt and write completion status on error */ - chanctrl = IOAT_CHANCTRL_ERR_INT_EN | - IOAT_CHANCTRL_ANY_ERR_ABORT_EN | - IOAT_CHANCTRL_ERR_COMPLETION_EN; - writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET); - - chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); - if (chanerr) { - dev_err(&ioat_chan->device->pdev->dev, - "CHANERR = %x, clearing\n", chanerr); - writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); - } - - /* Allocate descriptors */ - for (i = 0; i < ioat_initial_desc_count; i++) { - desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_KERNEL); - if (!desc) { - dev_err(&ioat_chan->device->pdev->dev, - "Only %d initial descriptors\n", i); - break; - } - list_add_tail(&desc->node, &tmp_list); - } - spin_lock_bh(&ioat_chan->desc_lock); - ioat_chan->desccount = i; - list_splice(&tmp_list, &ioat_chan->free_desc); - if (ioat_chan->device->version != IOAT_VER_1_2) - ioat2_dma_massage_chan_desc(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); - - /* allocate a completion writeback area */ - /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ - ioat_chan->completion_virt = - pci_pool_alloc(ioat_chan->device->completion_pool, - GFP_KERNEL, - &ioat_chan->completion_addr); - memset(ioat_chan->completion_virt, 0, - sizeof(*ioat_chan->completion_virt)); - writel(((u64) ioat_chan->completion_addr) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); - writel(((u64) ioat_chan->completion_addr) >> 32, - ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); - - tasklet_enable(&ioat_chan->cleanup_task); - ioat_dma_start_null_desc(ioat_chan); /* give chain to dma device */ - return ioat_chan->desccount; -} - -/** - * ioat_dma_free_chan_resources - release all the descriptors - * @chan: the channel to be cleaned - */ -static void ioat_dma_free_chan_resources(struct dma_chan *chan) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - struct ioatdma_device *ioatdma_device = to_ioatdma_device(chan->device); - struct ioat_desc_sw *desc, *_desc; - int in_use_descs = 0; - - /* Before freeing channel resources first check - * if they have been previously allocated for this channel. - */ - if (ioat_chan->desccount == 0) - return; - - tasklet_disable(&ioat_chan->cleanup_task); - ioat_dma_memcpy_cleanup(ioat_chan); - - /* Delay 100ms after reset to allow internal DMA logic to quiesce - * before removing DMA descriptor resources. - */ - writeb(IOAT_CHANCMD_RESET, - ioat_chan->reg_base - + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); - mdelay(100); - - spin_lock_bh(&ioat_chan->desc_lock); - switch (ioat_chan->device->version) { - case IOAT_VER_1_2: - list_for_each_entry_safe(desc, _desc, - &ioat_chan->used_desc, node) { - in_use_descs++; - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->async_tx.phys); - kfree(desc); - } - list_for_each_entry_safe(desc, _desc, - &ioat_chan->free_desc, node) { - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->async_tx.phys); - kfree(desc); - } - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - list_for_each_entry_safe(desc, _desc, - ioat_chan->free_desc.next, node) { - list_del(&desc->node); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->async_tx.phys); - kfree(desc); - } - desc = to_ioat_desc(ioat_chan->free_desc.next); - pci_pool_free(ioatdma_device->dma_pool, desc->hw, - desc->async_tx.phys); - kfree(desc); - INIT_LIST_HEAD(&ioat_chan->free_desc); - INIT_LIST_HEAD(&ioat_chan->used_desc); - break; - } - spin_unlock_bh(&ioat_chan->desc_lock); - - pci_pool_free(ioatdma_device->completion_pool, - ioat_chan->completion_virt, - ioat_chan->completion_addr); - - /* one is ok since we left it on there on purpose */ - if (in_use_descs > 1) - dev_err(&ioat_chan->device->pdev->dev, - "Freeing %d in use descriptors!\n", - in_use_descs - 1); - - ioat_chan->last_completion = ioat_chan->completion_addr = 0; - ioat_chan->pending = 0; - ioat_chan->dmacount = 0; - ioat_chan->desccount = 0; - ioat_chan->watchdog_completion = 0; - ioat_chan->last_compl_desc_addr_hw = 0; - ioat_chan->watchdog_tcp_cookie = - ioat_chan->watchdog_last_tcp_cookie = 0; -} - -/** - * ioat_dma_get_next_descriptor - return the next available descriptor - * @ioat_chan: IOAT DMA channel handle - * - * Gets the next descriptor from the chain, and must be called with the - * channel's desc_lock held. Allocates more descriptors if the channel - * has run out. - */ -static struct ioat_desc_sw * -ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) -{ - struct ioat_desc_sw *new; - - if (!list_empty(&ioat_chan->free_desc)) { - new = to_ioat_desc(ioat_chan->free_desc.next); - list_del(&new->node); - } else { - /* try to get another desc */ - new = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); - if (!new) { - dev_err(&ioat_chan->device->pdev->dev, - "alloc failed\n"); - return NULL; - } - } - - prefetch(new->hw); - return new; -} - -static struct ioat_desc_sw * -ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) -{ - struct ioat_desc_sw *new; - - /* - * used.prev points to where to start processing - * used.next points to next free descriptor - * if used.prev == NULL, there are none waiting to be processed - * if used.next == used.prev.prev, there is only one free descriptor, - * and we need to use it to as a noop descriptor before - * linking in a new set of descriptors, since the device - * has probably already read the pointer to it - */ - if (ioat_chan->used_desc.prev && - ioat_chan->used_desc.next == ioat_chan->used_desc.prev->prev) { - - struct ioat_desc_sw *desc; - struct ioat_desc_sw *noop_desc; - int i; - - /* set up the noop descriptor */ - noop_desc = to_ioat_desc(ioat_chan->used_desc.next); - /* set size to non-zero value (channel returns error when size is 0) */ - noop_desc->hw->size = NULL_DESC_BUFFER_SIZE; - noop_desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL; - noop_desc->hw->src_addr = 0; - noop_desc->hw->dst_addr = 0; - - ioat_chan->used_desc.next = ioat_chan->used_desc.next->next; - ioat_chan->pending++; - ioat_chan->dmacount++; - - /* try to get a few more descriptors */ - for (i = 16; i; i--) { - desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); - if (!desc) { - dev_err(&ioat_chan->device->pdev->dev, - "alloc failed\n"); - break; - } - list_add_tail(&desc->node, ioat_chan->used_desc.next); - - desc->hw->next - = to_ioat_desc(desc->node.next)->async_tx.phys; - to_ioat_desc(desc->node.prev)->hw->next - = desc->async_tx.phys; - ioat_chan->desccount++; - } - - ioat_chan->used_desc.next = noop_desc->node.next; - } - new = to_ioat_desc(ioat_chan->used_desc.next); - prefetch(new); - ioat_chan->used_desc.next = new->node.next; - - if (ioat_chan->used_desc.prev == NULL) - ioat_chan->used_desc.prev = &new->node; - - prefetch(new->hw); - return new; -} - -static struct ioat_desc_sw *ioat_dma_get_next_descriptor( - struct ioat_dma_chan *ioat_chan) -{ - if (!ioat_chan) - return NULL; - - switch (ioat_chan->device->version) { - case IOAT_VER_1_2: - return ioat1_dma_get_next_descriptor(ioat_chan); - case IOAT_VER_2_0: - case IOAT_VER_3_0: - return ioat2_dma_get_next_descriptor(ioat_chan); - } - return NULL; -} - -static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy( - struct dma_chan *chan, - dma_addr_t dma_dest, - dma_addr_t dma_src, - size_t len, - unsigned long flags) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - struct ioat_desc_sw *new; - - spin_lock_bh(&ioat_chan->desc_lock); - new = ioat_dma_get_next_descriptor(ioat_chan); - spin_unlock_bh(&ioat_chan->desc_lock); - - if (new) { - new->len = len; - new->dst = dma_dest; - new->src = dma_src; - new->async_tx.flags = flags; - return &new->async_tx; - } else { - dev_err(&ioat_chan->device->pdev->dev, - "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", - chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); - return NULL; - } -} - -static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy( - struct dma_chan *chan, - dma_addr_t dma_dest, - dma_addr_t dma_src, - size_t len, - unsigned long flags) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - struct ioat_desc_sw *new; - - spin_lock_bh(&ioat_chan->desc_lock); - new = ioat2_dma_get_next_descriptor(ioat_chan); - - /* - * leave ioat_chan->desc_lock set in ioat 2 path - * it will get unlocked at end of tx_submit - */ - - if (new) { - new->len = len; - new->dst = dma_dest; - new->src = dma_src; - new->async_tx.flags = flags; - return &new->async_tx; - } else { - spin_unlock_bh(&ioat_chan->desc_lock); - dev_err(&ioat_chan->device->pdev->dev, - "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", - chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); - return NULL; - } -} - -static void ioat_dma_cleanup_tasklet(unsigned long data) -{ - struct ioat_dma_chan *chan = (void *)data; - ioat_dma_memcpy_cleanup(chan); - writew(IOAT_CHANCTRL_INT_DISABLE, - chan->reg_base + IOAT_CHANCTRL_OFFSET); -} - -static void -ioat_dma_unmap(struct ioat_dma_chan *ioat_chan, struct ioat_desc_sw *desc) -{ - if (!(desc->async_tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) { - if (desc->async_tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE) - pci_unmap_single(ioat_chan->device->pdev, - pci_unmap_addr(desc, dst), - pci_unmap_len(desc, len), - PCI_DMA_FROMDEVICE); - else - pci_unmap_page(ioat_chan->device->pdev, - pci_unmap_addr(desc, dst), - pci_unmap_len(desc, len), - PCI_DMA_FROMDEVICE); - } - - if (!(desc->async_tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) { - if (desc->async_tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE) - pci_unmap_single(ioat_chan->device->pdev, - pci_unmap_addr(desc, src), - pci_unmap_len(desc, len), - PCI_DMA_TODEVICE); - else - pci_unmap_page(ioat_chan->device->pdev, - pci_unmap_addr(desc, src), - pci_unmap_len(desc, len), - PCI_DMA_TODEVICE); - } -} - -/** - * ioat_dma_memcpy_cleanup - cleanup up finished descriptors - * @chan: ioat channel to be cleaned up - */ -static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) -{ - unsigned long phys_complete; - struct ioat_desc_sw *desc, *_desc; - dma_cookie_t cookie = 0; - unsigned long desc_phys; - struct ioat_desc_sw *latest_desc; - - prefetch(ioat_chan->completion_virt); - - if (!spin_trylock_bh(&ioat_chan->cleanup_lock)) - return; - - /* The completion writeback can happen at any time, - so reads by the driver need to be atomic operations - The descriptor physical addresses are limited to 32-bits - when the CPU can only do a 32-bit mov */ - -#if (BITS_PER_LONG == 64) - phys_complete = - ioat_chan->completion_virt->full - & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; -#else - phys_complete = - ioat_chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK; -#endif - - if ((ioat_chan->completion_virt->full - & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == - IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) { - dev_err(&ioat_chan->device->pdev->dev, - "Channel halted, chanerr = %x\n", - readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET)); - - /* TODO do something to salvage the situation */ - } - - if (phys_complete == ioat_chan->last_completion) { - spin_unlock_bh(&ioat_chan->cleanup_lock); - /* - * perhaps we're stuck so hard that the watchdog can't go off? - * try to catch it after 2 seconds - */ - if (ioat_chan->device->version != IOAT_VER_3_0) { - if (time_after(jiffies, - ioat_chan->last_completion_time + HZ*WATCHDOG_DELAY)) { - ioat_dma_chan_watchdog(&(ioat_chan->device->work.work)); - ioat_chan->last_completion_time = jiffies; - } - } - return; - } - ioat_chan->last_completion_time = jiffies; - - cookie = 0; - if (!spin_trylock_bh(&ioat_chan->desc_lock)) { - spin_unlock_bh(&ioat_chan->cleanup_lock); - return; - } - - switch (ioat_chan->device->version) { - case IOAT_VER_1_2: - list_for_each_entry_safe(desc, _desc, - &ioat_chan->used_desc, node) { - - /* - * Incoming DMA requests may use multiple descriptors, - * due to exceeding xfercap, perhaps. If so, only the - * last one will have a cookie, and require unmapping. - */ - if (desc->async_tx.cookie) { - cookie = desc->async_tx.cookie; - ioat_dma_unmap(ioat_chan, desc); - if (desc->async_tx.callback) { - desc->async_tx.callback(desc->async_tx.callback_param); - desc->async_tx.callback = NULL; - } - } - - if (desc->async_tx.phys != phys_complete) { - /* - * a completed entry, but not the last, so clean - * up if the client is done with the descriptor - */ - if (async_tx_test_ack(&desc->async_tx)) { - list_move_tail(&desc->node, - &ioat_chan->free_desc); - } else - desc->async_tx.cookie = 0; - } else { - /* - * last used desc. Do not remove, so we can - * append from it, but don't look at it next - * time, either - */ - desc->async_tx.cookie = 0; - - /* TODO check status bits? */ - break; - } - } - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - /* has some other thread has already cleaned up? */ - if (ioat_chan->used_desc.prev == NULL) - break; - - /* work backwards to find latest finished desc */ - desc = to_ioat_desc(ioat_chan->used_desc.next); - latest_desc = NULL; - do { - desc = to_ioat_desc(desc->node.prev); - desc_phys = (unsigned long)desc->async_tx.phys - & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; - if (desc_phys == phys_complete) { - latest_desc = desc; - break; - } - } while (&desc->node != ioat_chan->used_desc.prev); - - if (latest_desc != NULL) { - - /* work forwards to clear finished descriptors */ - for (desc = to_ioat_desc(ioat_chan->used_desc.prev); - &desc->node != latest_desc->node.next && - &desc->node != ioat_chan->used_desc.next; - desc = to_ioat_desc(desc->node.next)) { - if (desc->async_tx.cookie) { - cookie = desc->async_tx.cookie; - desc->async_tx.cookie = 0; - ioat_dma_unmap(ioat_chan, desc); - if (desc->async_tx.callback) { - desc->async_tx.callback(desc->async_tx.callback_param); - desc->async_tx.callback = NULL; - } - } - } - - /* move used.prev up beyond those that are finished */ - if (&desc->node == ioat_chan->used_desc.next) - ioat_chan->used_desc.prev = NULL; - else - ioat_chan->used_desc.prev = &desc->node; - } - break; - } - - spin_unlock_bh(&ioat_chan->desc_lock); - - ioat_chan->last_completion = phys_complete; - if (cookie != 0) - ioat_chan->completed_cookie = cookie; - - spin_unlock_bh(&ioat_chan->cleanup_lock); -} - -/** - * ioat_dma_is_complete - poll the status of a IOAT DMA transaction - * @chan: IOAT DMA channel handle - * @cookie: DMA transaction identifier - * @done: if not %NULL, updated with last completed transaction - * @used: if not %NULL, updated with last used transaction - */ -static enum dma_status ioat_dma_is_complete(struct dma_chan *chan, - dma_cookie_t cookie, - dma_cookie_t *done, - dma_cookie_t *used) -{ - struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); - dma_cookie_t last_used; - dma_cookie_t last_complete; - enum dma_status ret; - - last_used = chan->cookie; - last_complete = ioat_chan->completed_cookie; - ioat_chan->watchdog_tcp_cookie = cookie; - - if (done) - *done = last_complete; - if (used) - *used = last_used; - - ret = dma_async_is_complete(cookie, last_complete, last_used); - if (ret == DMA_SUCCESS) - return ret; - - ioat_dma_memcpy_cleanup(ioat_chan); - - last_used = chan->cookie; - last_complete = ioat_chan->completed_cookie; - - if (done) - *done = last_complete; - if (used) - *used = last_used; - - return dma_async_is_complete(cookie, last_complete, last_used); -} - -static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) -{ - struct ioat_desc_sw *desc; - - spin_lock_bh(&ioat_chan->desc_lock); - - desc = ioat_dma_get_next_descriptor(ioat_chan); - - if (!desc) { - dev_err(&ioat_chan->device->pdev->dev, - "Unable to start null desc - get next desc failed\n"); - spin_unlock_bh(&ioat_chan->desc_lock); - return; - } - - desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL - | IOAT_DMA_DESCRIPTOR_CTL_INT_GN - | IOAT_DMA_DESCRIPTOR_CTL_CP_STS; - /* set size to non-zero value (channel returns error when size is 0) */ - desc->hw->size = NULL_DESC_BUFFER_SIZE; - desc->hw->src_addr = 0; - desc->hw->dst_addr = 0; - async_tx_ack(&desc->async_tx); - switch (ioat_chan->device->version) { - case IOAT_VER_1_2: - desc->hw->next = 0; - list_add_tail(&desc->node, &ioat_chan->used_desc); - - writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->async_tx.phys) >> 32, - ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); - - writeb(IOAT_CHANCMD_START, ioat_chan->reg_base - + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, - ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); - writel(((u64) desc->async_tx.phys) >> 32, - ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); - - ioat_chan->dmacount++; - __ioat2_dma_memcpy_issue_pending(ioat_chan); - break; - } - spin_unlock_bh(&ioat_chan->desc_lock); -} - -/* - * Perform a IOAT transaction to verify the HW works. - */ -#define IOAT_TEST_SIZE 2000 - -static void ioat_dma_test_callback(void *dma_async_param) -{ - struct completion *cmp = dma_async_param; - - complete(cmp); -} - -/** - * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works. - * @device: device to be tested - */ -static int ioat_dma_self_test(struct ioatdma_device *device) -{ - int i; - u8 *src; - u8 *dest; - struct dma_chan *dma_chan; - struct dma_async_tx_descriptor *tx; - dma_addr_t dma_dest, dma_src; - dma_cookie_t cookie; - int err = 0; - struct completion cmp; - unsigned long tmo; - unsigned long flags; - - src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); - if (!src) - return -ENOMEM; - dest = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); - if (!dest) { - kfree(src); - return -ENOMEM; - } - - /* Fill in src buffer */ - for (i = 0; i < IOAT_TEST_SIZE; i++) - src[i] = (u8)i; - - /* Start copy, using first DMA channel */ - dma_chan = container_of(device->common.channels.next, - struct dma_chan, - device_node); - if (device->common.device_alloc_chan_resources(dma_chan) < 1) { - dev_err(&device->pdev->dev, - "selftest cannot allocate chan resource\n"); - err = -ENODEV; - goto out; - } - - dma_src = dma_map_single(dma_chan->device->dev, src, IOAT_TEST_SIZE, - DMA_TO_DEVICE); - dma_dest = dma_map_single(dma_chan->device->dev, dest, IOAT_TEST_SIZE, - DMA_FROM_DEVICE); - flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_COMPL_DEST_UNMAP_SINGLE; - tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src, - IOAT_TEST_SIZE, flags); - if (!tx) { - dev_err(&device->pdev->dev, - "Self-test prep failed, disabling\n"); - err = -ENODEV; - goto free_resources; - } - - async_tx_ack(tx); - init_completion(&cmp); - tx->callback = ioat_dma_test_callback; - tx->callback_param = &cmp; - cookie = tx->tx_submit(tx); - if (cookie < 0) { - dev_err(&device->pdev->dev, - "Self-test setup failed, disabling\n"); - err = -ENODEV; - goto free_resources; - } - device->common.device_issue_pending(dma_chan); - - tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); - - if (tmo == 0 || - device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL) - != DMA_SUCCESS) { - dev_err(&device->pdev->dev, - "Self-test copy timed out, disabling\n"); - err = -ENODEV; - goto free_resources; - } - if (memcmp(src, dest, IOAT_TEST_SIZE)) { - dev_err(&device->pdev->dev, - "Self-test copy failed compare, disabling\n"); - err = -ENODEV; - goto free_resources; - } - -free_resources: - device->common.device_free_chan_resources(dma_chan); -out: - kfree(src); - kfree(dest); - return err; -} - -static char ioat_interrupt_style[32] = "msix"; -module_param_string(ioat_interrupt_style, ioat_interrupt_style, - sizeof(ioat_interrupt_style), 0644); -MODULE_PARM_DESC(ioat_interrupt_style, - "set ioat interrupt style: msix (default), " - "msix-single-vector, msi, intx)"); - -/** - * ioat_dma_setup_interrupts - setup interrupt handler - * @device: ioat device - */ -static int ioat_dma_setup_interrupts(struct ioatdma_device *device) -{ - struct ioat_dma_chan *ioat_chan; - int err, i, j, msixcnt; - u8 intrctrl = 0; - - if (!strcmp(ioat_interrupt_style, "msix")) - goto msix; - if (!strcmp(ioat_interrupt_style, "msix-single-vector")) - goto msix_single_vector; - if (!strcmp(ioat_interrupt_style, "msi")) - goto msi; - if (!strcmp(ioat_interrupt_style, "intx")) - goto intx; - dev_err(&device->pdev->dev, "invalid ioat_interrupt_style %s\n", - ioat_interrupt_style); - goto err_no_irq; - -msix: - /* The number of MSI-X vectors should equal the number of channels */ - msixcnt = device->common.chancnt; - for (i = 0; i < msixcnt; i++) - device->msix_entries[i].entry = i; - - err = pci_enable_msix(device->pdev, device->msix_entries, msixcnt); - if (err < 0) - goto msi; - if (err > 0) - goto msix_single_vector; - - for (i = 0; i < msixcnt; i++) { - ioat_chan = ioat_lookup_chan_by_index(device, i); - err = request_irq(device->msix_entries[i].vector, - ioat_dma_do_interrupt_msix, - 0, "ioat-msix", ioat_chan); - if (err) { - for (j = 0; j < i; j++) { - ioat_chan = - ioat_lookup_chan_by_index(device, j); - free_irq(device->msix_entries[j].vector, - ioat_chan); - } - goto msix_single_vector; - } - } - intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL; - device->irq_mode = msix_multi_vector; - goto done; - -msix_single_vector: - device->msix_entries[0].entry = 0; - err = pci_enable_msix(device->pdev, device->msix_entries, 1); - if (err) - goto msi; - - err = request_irq(device->msix_entries[0].vector, ioat_dma_do_interrupt, - 0, "ioat-msix", device); - if (err) { - pci_disable_msix(device->pdev); - goto msi; - } - device->irq_mode = msix_single_vector; - goto done; - -msi: - err = pci_enable_msi(device->pdev); - if (err) - goto intx; - - err = request_irq(device->pdev->irq, ioat_dma_do_interrupt, - 0, "ioat-msi", device); - if (err) { - pci_disable_msi(device->pdev); - goto intx; - } - /* - * CB 1.2 devices need a bit set in configuration space to enable MSI - */ - if (device->version == IOAT_VER_1_2) { - u32 dmactrl; - pci_read_config_dword(device->pdev, - IOAT_PCI_DMACTRL_OFFSET, &dmactrl); - dmactrl |= IOAT_PCI_DMACTRL_MSI_EN; - pci_write_config_dword(device->pdev, - IOAT_PCI_DMACTRL_OFFSET, dmactrl); - } - device->irq_mode = msi; - goto done; - -intx: - err = request_irq(device->pdev->irq, ioat_dma_do_interrupt, - IRQF_SHARED, "ioat-intx", device); - if (err) - goto err_no_irq; - device->irq_mode = intx; - -done: - intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN; - writeb(intrctrl, device->reg_base + IOAT_INTRCTRL_OFFSET); - return 0; - -err_no_irq: - /* Disable all interrupt generation */ - writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); - dev_err(&device->pdev->dev, "no usable interrupts\n"); - device->irq_mode = none; - return -1; -} - -/** - * ioat_dma_remove_interrupts - remove whatever interrupts were set - * @device: ioat device - */ -static void ioat_dma_remove_interrupts(struct ioatdma_device *device) -{ - struct ioat_dma_chan *ioat_chan; - int i; - - /* Disable all interrupt generation */ - writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); - - switch (device->irq_mode) { - case msix_multi_vector: - for (i = 0; i < device->common.chancnt; i++) { - ioat_chan = ioat_lookup_chan_by_index(device, i); - free_irq(device->msix_entries[i].vector, ioat_chan); - } - pci_disable_msix(device->pdev); - break; - case msix_single_vector: - free_irq(device->msix_entries[0].vector, device); - pci_disable_msix(device->pdev); - break; - case msi: - free_irq(device->pdev->irq, device); - pci_disable_msi(device->pdev); - break; - case intx: - free_irq(device->pdev->irq, device); - break; - case none: - dev_warn(&device->pdev->dev, - "call to %s without interrupts setup\n", __func__); - } - device->irq_mode = none; -} - -struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, - void __iomem *iobase) -{ - int err; - struct ioatdma_device *device; - - device = kzalloc(sizeof(*device), GFP_KERNEL); - if (!device) { - err = -ENOMEM; - goto err_kzalloc; - } - device->pdev = pdev; - device->reg_base = iobase; - device->version = readb(device->reg_base + IOAT_VER_OFFSET); - - /* DMA coherent memory pool for DMA descriptor allocations */ - device->dma_pool = pci_pool_create("dma_desc_pool", pdev, - sizeof(struct ioat_dma_descriptor), - 64, 0); - if (!device->dma_pool) { - err = -ENOMEM; - goto err_dma_pool; - } - - device->completion_pool = pci_pool_create("completion_pool", pdev, - sizeof(u64), SMP_CACHE_BYTES, - SMP_CACHE_BYTES); - if (!device->completion_pool) { - err = -ENOMEM; - goto err_completion_pool; - } - - INIT_LIST_HEAD(&device->common.channels); - ioat_dma_enumerate_channels(device); - - device->common.device_alloc_chan_resources = - ioat_dma_alloc_chan_resources; - device->common.device_free_chan_resources = - ioat_dma_free_chan_resources; - device->common.dev = &pdev->dev; - - dma_cap_set(DMA_MEMCPY, device->common.cap_mask); - device->common.device_is_tx_complete = ioat_dma_is_complete; - switch (device->version) { - case IOAT_VER_1_2: - device->common.device_prep_dma_memcpy = ioat1_dma_prep_memcpy; - device->common.device_issue_pending = - ioat1_dma_memcpy_issue_pending; - break; - case IOAT_VER_2_0: - case IOAT_VER_3_0: - device->common.device_prep_dma_memcpy = ioat2_dma_prep_memcpy; - device->common.device_issue_pending = - ioat2_dma_memcpy_issue_pending; - break; - } - - dev_err(&device->pdev->dev, - "Intel(R) I/OAT DMA Engine found," - " %d channels, device version 0x%02x, driver version %s\n", - device->common.chancnt, device->version, IOAT_DMA_VERSION); - - if (!device->common.chancnt) { - dev_err(&device->pdev->dev, - "Intel(R) I/OAT DMA Engine problem found: " - "zero channels detected\n"); - goto err_setup_interrupts; - } - - err = ioat_dma_setup_interrupts(device); - if (err) - goto err_setup_interrupts; - - err = ioat_dma_self_test(device); - if (err) - goto err_self_test; - - ioat_set_tcp_copy_break(device); - - dma_async_device_register(&device->common); - - if (device->version != IOAT_VER_3_0) { - INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); - schedule_delayed_work(&device->work, - WATCHDOG_DELAY); - } - - return device; - -err_self_test: - ioat_dma_remove_interrupts(device); -err_setup_interrupts: - pci_pool_destroy(device->completion_pool); -err_completion_pool: - pci_pool_destroy(device->dma_pool); -err_dma_pool: - kfree(device); -err_kzalloc: - dev_err(&pdev->dev, - "Intel(R) I/OAT DMA Engine initialization failed\n"); - return NULL; -} - -void ioat_dma_remove(struct ioatdma_device *device) -{ - struct dma_chan *chan, *_chan; - struct ioat_dma_chan *ioat_chan; - - if (device->version != IOAT_VER_3_0) - cancel_delayed_work(&device->work); - - ioat_dma_remove_interrupts(device); - - dma_async_device_unregister(&device->common); - - pci_pool_destroy(device->dma_pool); - pci_pool_destroy(device->completion_pool); - - iounmap(device->reg_base); - pci_release_regions(device->pdev); - pci_disable_device(device->pdev); - - list_for_each_entry_safe(chan, _chan, - &device->common.channels, device_node) { - ioat_chan = to_ioat_chan(chan); - list_del(&chan->device_node); - kfree(ioat_chan); - } - kfree(device); -} - diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h deleted file mode 100644 index a52ff4bd460..00000000000 --- a/drivers/dma/ioatdma.h +++ /dev/null @@ -1,165 +0,0 @@ -/* - * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the Free - * Software Foundation; either version 2 of the License, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 59 - * Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * - * The full GNU General Public License is included in this distribution in the - * file called COPYING. - */ -#ifndef IOATDMA_H -#define IOATDMA_H - -#include <linux/dmaengine.h> -#include "ioatdma_hw.h" -#include <linux/init.h> -#include <linux/dmapool.h> -#include <linux/cache.h> -#include <linux/pci_ids.h> -#include <net/tcp.h> - -#define IOAT_DMA_VERSION "3.64" - -enum ioat_interrupt { - none = 0, - msix_multi_vector = 1, - msix_single_vector = 2, - msi = 3, - intx = 4, -}; - -#define IOAT_LOW_COMPLETION_MASK 0xffffffc0 -#define IOAT_DMA_DCA_ANY_CPU ~0 -#define IOAT_WATCHDOG_PERIOD (2 * HZ) - - -/** - * struct ioatdma_device - internal representation of a IOAT device - * @pdev: PCI-Express device - * @reg_base: MMIO register space base address - * @dma_pool: for allocating DMA descriptors - * @common: embedded struct dma_device - * @version: version of ioatdma device - * @irq_mode: which style irq to use - * @msix_entries: irq handlers - * @idx: per channel data - */ - -struct ioatdma_device { - struct pci_dev *pdev; - void __iomem *reg_base; - struct pci_pool *dma_pool; - struct pci_pool *completion_pool; - struct dma_device common; - u8 version; - enum ioat_interrupt irq_mode; - struct delayed_work work; - struct msix_entry msix_entries[4]; - struct ioat_dma_chan *idx[4]; -}; - -/** - * struct ioat_dma_chan - internal representation of a DMA channel - */ -struct ioat_dma_chan { - - void __iomem *reg_base; - - dma_cookie_t completed_cookie; - unsigned long last_completion; - unsigned long last_completion_time; - - size_t xfercap; /* XFERCAP register value expanded out */ - - spinlock_t cleanup_lock; - spinlock_t desc_lock; - struct list_head free_desc; - struct list_head used_desc; - unsigned long watchdog_completion; - int watchdog_tcp_cookie; - u32 watchdog_last_tcp_cookie; - struct delayed_work work; - - int pending; - int dmacount; - int desccount; - - struct ioatdma_device *device; - struct dma_chan common; - - dma_addr_t completion_addr; - union { - u64 full; /* HW completion writeback */ - struct { - u32 low; - u32 high; - }; - } *completion_virt; - unsigned long last_compl_desc_addr_hw; - struct tasklet_struct cleanup_task; -}; - -/* wrapper around hardware descriptor format + additional software fields */ - -/** - * struct ioat_desc_sw - wrapper around hardware descriptor - * @hw: hardware DMA descriptor - * @node: this descriptor will either be on the free list, - * or attached to a transaction list (async_tx.tx_list) - * @tx_cnt: number of descriptors required to complete the transaction - * @async_tx: the generic software descriptor for all engines - */ -struct ioat_desc_sw { - struct ioat_dma_descriptor *hw; - struct list_head node; - int tx_cnt; - size_t len; - dma_addr_t src; - dma_addr_t dst; - struct dma_async_tx_descriptor async_tx; -}; - -static inline void ioat_set_tcp_copy_break(struct ioatdma_device *dev) -{ - #ifdef CONFIG_NET_DMA - switch (dev->version) { - case IOAT_VER_1_2: - sysctl_tcp_dma_copybreak = 4096; - break; - case IOAT_VER_2_0: - sysctl_tcp_dma_copybreak = 2048; - break; - case IOAT_VER_3_0: - sysctl_tcp_dma_copybreak = 262144; - break; - } - #endif -} - -#if defined(CONFIG_INTEL_IOATDMA) || defined(CONFIG_INTEL_IOATDMA_MODULE) -struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, - void __iomem *iobase); -void ioat_dma_remove(struct ioatdma_device *device); -struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); -struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); -struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); -#else -#define ioat_dma_probe(pdev, iobase) NULL -#define ioat_dma_remove(device) do { } while (0) -#define ioat_dca_init(pdev, iobase) NULL -#define ioat2_dca_init(pdev, iobase) NULL -#define ioat3_dca_init(pdev, iobase) NULL -#endif - -#endif /* IOATDMA_H */ diff --git a/drivers/dma/iovlock.c b/drivers/dma/iovlock.c index 9f6fe46a9b8..c0a272c7368 100644 --- a/drivers/dma/iovlock.c +++ b/drivers/dma/iovlock.c @@ -183,6 +183,11 @@ dma_cookie_t dma_memcpy_to_iovec(struct dma_chan *chan, struct iovec *iov, iov_byte_offset, kdata, copy); + /* poll for a descriptor slot */ + if (unlikely(dma_cookie < 0)) { + dma_async_issue_pending(chan); + continue; + } len -= copy; iov[iovec_idx].iov_len -= copy; @@ -248,6 +253,11 @@ dma_cookie_t dma_memcpy_pg_to_iovec(struct dma_chan *chan, struct iovec *iov, page, offset, copy); + /* poll for a descriptor slot */ + if (unlikely(dma_cookie < 0)) { + dma_async_issue_pending(chan); + continue; + } len -= copy; iov[iovec_idx].iov_len -= copy; |