diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/dmaengine.h | 237 |
1 files changed, 149 insertions, 88 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index c94d8f1d62e..3de1cf71031 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -21,13 +21,12 @@ #ifndef DMAENGINE_H #define DMAENGINE_H -#ifdef CONFIG_DMA_ENGINE - #include <linux/device.h> #include <linux/uio.h> #include <linux/kref.h> #include <linux/completion.h> #include <linux/rcupdate.h> +#include <linux/dma-mapping.h> /** * enum dma_event - resource PNP/power managment events @@ -65,6 +64,31 @@ enum dma_status { }; /** + * enum dma_transaction_type - DMA transaction types/indexes + */ +enum dma_transaction_type { + DMA_MEMCPY, + DMA_XOR, + DMA_PQ_XOR, + DMA_DUAL_XOR, + DMA_PQ_UPDATE, + DMA_ZERO_SUM, + DMA_PQ_ZERO_SUM, + DMA_MEMSET, + DMA_MEMCPY_CRC32C, + DMA_INTERRUPT, +}; + +/* last transaction type for creation of the capabilities mask */ +#define DMA_TX_TYPE_END (DMA_INTERRUPT + 1) + +/** + * dma_cap_mask_t - capabilities bitmap modeled after cpumask_t. + * See linux/cpumask.h + */ +typedef struct { DECLARE_BITMAP(bits, DMA_TX_TYPE_END); } dma_cap_mask_t; + +/** * struct dma_chan_percpu - the per-CPU part of struct dma_chan * @refcount: local_t used for open-coded "bigref" counting * @memcpy_count: transaction counter @@ -157,48 +181,106 @@ struct dma_client { struct list_head global_node; }; +typedef void (*dma_async_tx_callback)(void *dma_async_param); +/** + * struct dma_async_tx_descriptor - async transaction descriptor + * ---dma generic offload fields--- + * @cookie: tracking cookie for this transaction, set to -EBUSY if + * this tx is sitting on a dependency list + * @ack: the descriptor can not be reused until the client acknowledges + * receipt, i.e. has has a chance to establish any dependency chains + * @phys: physical address of the descriptor + * @tx_list: driver common field for operations that require multiple + * descriptors + * @chan: target channel for this operation + * @tx_submit: set the prepared descriptor(s) to be executed by the engine + * @tx_set_dest: set a destination address in a hardware descriptor + * @tx_set_src: set a source address in a hardware descriptor + * @callback: routine to call after this operation is complete + * @callback_param: general parameter to pass to the callback routine + * ---async_tx api specific fields--- + * @depend_list: at completion this list of transactions are submitted + * @depend_node: allow this transaction to be executed after another + * transaction has completed, possibly on another channel + * @parent: pointer to the next level up in the dependency chain + * @lock: protect the dependency list + */ +struct dma_async_tx_descriptor { + dma_cookie_t cookie; + int ack; + dma_addr_t phys; + struct list_head tx_list; + struct dma_chan *chan; + dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx); + void (*tx_set_dest)(dma_addr_t addr, + struct dma_async_tx_descriptor *tx, int index); + void (*tx_set_src)(dma_addr_t addr, + struct dma_async_tx_descriptor *tx, int index); + dma_async_tx_callback callback; + void *callback_param; + struct list_head depend_list; + struct list_head depend_node; + struct dma_async_tx_descriptor *parent; + spinlock_t lock; +}; + /** * struct dma_device - info on the entity supplying DMA services * @chancnt: how many DMA channels are supported * @channels: the list of struct dma_chan * @global_node: list_head for global dma_device_list + * @cap_mask: one or more dma_capability flags + * @max_xor: maximum number of xor sources, 0 if no capability * @refcount: reference count * @done: IO completion struct * @dev_id: unique device ID + * @dev: struct device reference for dma mapping api * @device_alloc_chan_resources: allocate resources and return the * number of allocated descriptors * @device_free_chan_resources: release DMA channel's resources - * @device_memcpy_buf_to_buf: memcpy buf pointer to buf pointer - * @device_memcpy_buf_to_pg: memcpy buf pointer to struct page - * @device_memcpy_pg_to_pg: memcpy struct page/offset to struct page/offset - * @device_memcpy_complete: poll the status of an IOAT DMA transaction - * @device_memcpy_issue_pending: push appended descriptors to hardware + * @device_prep_dma_memcpy: prepares a memcpy operation + * @device_prep_dma_xor: prepares a xor operation + * @device_prep_dma_zero_sum: prepares a zero_sum operation + * @device_prep_dma_memset: prepares a memset operation + * @device_prep_dma_interrupt: prepares an end of chain interrupt operation + * @device_dependency_added: async_tx notifies the channel about new deps + * @device_issue_pending: push pending transactions to hardware */ struct dma_device { unsigned int chancnt; struct list_head channels; struct list_head global_node; + dma_cap_mask_t cap_mask; + int max_xor; struct kref refcount; struct completion done; int dev_id; + struct device *dev; int (*device_alloc_chan_resources)(struct dma_chan *chan); void (*device_free_chan_resources)(struct dma_chan *chan); - dma_cookie_t (*device_memcpy_buf_to_buf)(struct dma_chan *chan, - void *dest, void *src, size_t len); - dma_cookie_t (*device_memcpy_buf_to_pg)(struct dma_chan *chan, - struct page *page, unsigned int offset, void *kdata, - size_t len); - dma_cookie_t (*device_memcpy_pg_to_pg)(struct dma_chan *chan, - struct page *dest_pg, unsigned int dest_off, - struct page *src_pg, unsigned int src_off, size_t len); - enum dma_status (*device_memcpy_complete)(struct dma_chan *chan, + + struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)( + struct dma_chan *chan, size_t len, int int_en); + struct dma_async_tx_descriptor *(*device_prep_dma_xor)( + struct dma_chan *chan, unsigned int src_cnt, size_t len, + int int_en); + struct dma_async_tx_descriptor *(*device_prep_dma_zero_sum)( + struct dma_chan *chan, unsigned int src_cnt, size_t len, + u32 *result, int int_en); + struct dma_async_tx_descriptor *(*device_prep_dma_memset)( + struct dma_chan *chan, int value, size_t len, int int_en); + struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)( + struct dma_chan *chan); + + void (*device_dependency_added)(struct dma_chan *chan); + enum dma_status (*device_is_tx_complete)(struct dma_chan *chan, dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used); - void (*device_memcpy_issue_pending)(struct dma_chan *chan); + void (*device_issue_pending)(struct dma_chan *chan); }; /* --- public DMA engine API --- */ @@ -207,96 +289,72 @@ struct dma_client *dma_async_client_register(dma_event_callback event_callback); void dma_async_client_unregister(struct dma_client *client); void dma_async_client_chan_request(struct dma_client *client, unsigned int number); +dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan, + void *dest, void *src, size_t len); +dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan, + struct page *page, unsigned int offset, void *kdata, size_t len); +dma_cookie_t dma_async_memcpy_pg_to_pg(struct dma_chan *chan, + struct page *dest_pg, unsigned int dest_off, struct page *src_pg, + unsigned int src_off, size_t len); +void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, + struct dma_chan *chan); -/** - * dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses - * @chan: DMA channel to offload copy to - * @dest: destination address (virtual) - * @src: source address (virtual) - * @len: length - * - * Both @dest and @src must be mappable to a bus address according to the - * DMA mapping API rules for streaming mappings. - * Both @dest and @src must stay memory resident (kernel memory or locked - * user space pages). - */ -static inline dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan, - void *dest, void *src, size_t len) -{ - int cpu = get_cpu(); - per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; - per_cpu_ptr(chan->local, cpu)->memcpy_count++; - put_cpu(); - return chan->device->device_memcpy_buf_to_buf(chan, dest, src, len); +static inline void +async_tx_ack(struct dma_async_tx_descriptor *tx) +{ + tx->ack = 1; } -/** - * dma_async_memcpy_buf_to_pg - offloaded copy from address to page - * @chan: DMA channel to offload copy to - * @page: destination page - * @offset: offset in page to copy to - * @kdata: source address (virtual) - * @len: length - * - * Both @page/@offset and @kdata must be mappable to a bus address according - * to the DMA mapping API rules for streaming mappings. - * Both @page/@offset and @kdata must stay memory resident (kernel memory or - * locked user space pages) - */ -static inline dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan, - struct page *page, unsigned int offset, void *kdata, size_t len) +#define first_dma_cap(mask) __first_dma_cap(&(mask)) +static inline int __first_dma_cap(const dma_cap_mask_t *srcp) { - int cpu = get_cpu(); - per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; - per_cpu_ptr(chan->local, cpu)->memcpy_count++; - put_cpu(); + return min_t(int, DMA_TX_TYPE_END, + find_first_bit(srcp->bits, DMA_TX_TYPE_END)); +} - return chan->device->device_memcpy_buf_to_pg(chan, page, offset, - kdata, len); +#define next_dma_cap(n, mask) __next_dma_cap((n), &(mask)) +static inline int __next_dma_cap(int n, const dma_cap_mask_t *srcp) +{ + return min_t(int, DMA_TX_TYPE_END, + find_next_bit(srcp->bits, DMA_TX_TYPE_END, n+1)); } -/** - * dma_async_memcpy_pg_to_pg - offloaded copy from page to page - * @chan: DMA channel to offload copy to - * @dest_pg: destination page - * @dest_off: offset in page to copy to - * @src_pg: source page - * @src_off: offset in page to copy from - * @len: length - * - * Both @dest_page/@dest_off and @src_page/@src_off must be mappable to a bus - * address according to the DMA mapping API rules for streaming mappings. - * Both @dest_page/@dest_off and @src_page/@src_off must stay memory resident - * (kernel memory or locked user space pages). - */ -static inline dma_cookie_t dma_async_memcpy_pg_to_pg(struct dma_chan *chan, - struct page *dest_pg, unsigned int dest_off, struct page *src_pg, - unsigned int src_off, size_t len) +#define dma_cap_set(tx, mask) __dma_cap_set((tx), &(mask)) +static inline void +__dma_cap_set(enum dma_transaction_type tx_type, dma_cap_mask_t *dstp) { - int cpu = get_cpu(); - per_cpu_ptr(chan->local, cpu)->bytes_transferred += len; - per_cpu_ptr(chan->local, cpu)->memcpy_count++; - put_cpu(); + set_bit(tx_type, dstp->bits); +} - return chan->device->device_memcpy_pg_to_pg(chan, dest_pg, dest_off, - src_pg, src_off, len); +#define dma_has_cap(tx, mask) __dma_has_cap((tx), &(mask)) +static inline int +__dma_has_cap(enum dma_transaction_type tx_type, dma_cap_mask_t *srcp) +{ + return test_bit(tx_type, srcp->bits); } +#define for_each_dma_cap_mask(cap, mask) \ + for ((cap) = first_dma_cap(mask); \ + (cap) < DMA_TX_TYPE_END; \ + (cap) = next_dma_cap((cap), (mask))) + /** - * dma_async_memcpy_issue_pending - flush pending copies to HW + * dma_async_issue_pending - flush pending transactions to HW * @chan: target DMA channel * * This allows drivers to push copies to HW in batches, * reducing MMIO writes where possible. */ -static inline void dma_async_memcpy_issue_pending(struct dma_chan *chan) +static inline void dma_async_issue_pending(struct dma_chan *chan) { - return chan->device->device_memcpy_issue_pending(chan); + return chan->device->device_issue_pending(chan); } +#define dma_async_memcpy_issue_pending(chan) dma_async_issue_pending(chan) + /** - * dma_async_memcpy_complete - poll for transaction completion + * dma_async_is_tx_complete - poll for transaction completion * @chan: DMA channel * @cookie: transaction identifier to check status of * @last: returns last completed cookie, can be NULL @@ -306,12 +364,15 @@ static inline void dma_async_memcpy_issue_pending(struct dma_chan *chan) * internal state and can be used with dma_async_is_complete() to check * the status of multiple cookies without re-checking hardware state. */ -static inline enum dma_status dma_async_memcpy_complete(struct dma_chan *chan, +static inline enum dma_status dma_async_is_tx_complete(struct dma_chan *chan, dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used) { - return chan->device->device_memcpy_complete(chan, cookie, last, used); + return chan->device->device_is_tx_complete(chan, cookie, last, used); } +#define dma_async_memcpy_complete(chan, cookie, last, used)\ + dma_async_is_tx_complete(chan, cookie, last, used) + /** * dma_async_is_complete - test a cookie against chan state * @cookie: transaction identifier to test status of @@ -334,6 +395,7 @@ static inline enum dma_status dma_async_is_complete(dma_cookie_t cookie, return DMA_IN_PROGRESS; } +enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie); /* --- DMA device --- */ @@ -362,5 +424,4 @@ dma_cookie_t dma_memcpy_pg_to_iovec(struct dma_chan *chan, struct iovec *iov, struct dma_pinned_list *pinned_list, struct page *page, unsigned int offset, size_t len); -#endif /* CONFIG_DMA_ENGINE */ #endif /* DMAENGINE_H */ |