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path: root/drivers/gpu/drm/drm_pci.c
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Diffstat (limited to 'drivers/gpu/drm/drm_pci.c')
-rw-r--r--drivers/gpu/drm/drm_pci.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
new file mode 100644
index 00000000000..b55d5bc6ea6
--- /dev/null
+++ b/drivers/gpu/drm/drm_pci.c
@@ -0,0 +1,183 @@
+/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
+/**
+ * \file drm_pci.c
+ * \brief Functions and ioctls to manage PCI memory
+ *
+ * \warning These interfaces aren't stable yet.
+ *
+ * \todo Implement the remaining ioctl's for the PCI pools.
+ * \todo The wrappers here are so thin that they would be better off inlined..
+ *
+ * \author José Fonseca <jrfonseca@tungstengraphics.com>
+ * \author Leif Delgass <ldelgass@retinalburn.net>
+ */
+
+/*
+ * Copyright 2003 José Fonseca.
+ * Copyright 2003 Leif Delgass.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include "drmP.h"
+
+/**********************************************************************/
+/** \name PCI memory */
+/*@{*/
+
+/**
+ * \brief Allocate a PCI consistent memory block, for DMA.
+ */
+drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align,
+ dma_addr_t maxaddr)
+{
+ drm_dma_handle_t *dmah;
+#if 1
+ unsigned long addr;
+ size_t sz;
+#endif
+#ifdef DRM_DEBUG_MEMORY
+ int area = DRM_MEM_DMA;
+
+ spin_lock(&drm_mem_lock);
+ if ((drm_ram_used >> PAGE_SHIFT)
+ > (DRM_RAM_PERCENT * drm_ram_available) / 100) {
+ spin_unlock(&drm_mem_lock);
+ return 0;
+ }
+ spin_unlock(&drm_mem_lock);
+#endif
+
+ /* pci_alloc_consistent only guarantees alignment to the smallest
+ * PAGE_SIZE order which is greater than or equal to the requested size.
+ * Return NULL here for now to make sure nobody tries for larger alignment
+ */
+ if (align > size)
+ return NULL;
+
+ if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) {
+ DRM_ERROR("Setting pci dma mask failed\n");
+ return NULL;
+ }
+
+ dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
+ if (!dmah)
+ return NULL;
+
+ dmah->size = size;
+ dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
+
+#ifdef DRM_DEBUG_MEMORY
+ if (dmah->vaddr == NULL) {
+ spin_lock(&drm_mem_lock);
+ ++drm_mem_stats[area].fail_count;
+ spin_unlock(&drm_mem_lock);
+ kfree(dmah);
+ return NULL;
+ }
+
+ spin_lock(&drm_mem_lock);
+ ++drm_mem_stats[area].succeed_count;
+ drm_mem_stats[area].bytes_allocated += size;
+ drm_ram_used += size;
+ spin_unlock(&drm_mem_lock);
+#else
+ if (dmah->vaddr == NULL) {
+ kfree(dmah);
+ return NULL;
+ }
+#endif
+
+ memset(dmah->vaddr, 0, size);
+
+ /* XXX - Is virt_to_page() legal for consistent mem? */
+ /* Reserve */
+ for (addr = (unsigned long)dmah->vaddr, sz = size;
+ sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
+ SetPageReserved(virt_to_page(addr));
+ }
+
+ return dmah;
+}
+
+EXPORT_SYMBOL(drm_pci_alloc);
+
+/**
+ * \brief Free a PCI consistent memory block without freeing its descriptor.
+ *
+ * This function is for internal use in the Linux-specific DRM core code.
+ */
+void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
+{
+#if 1
+ unsigned long addr;
+ size_t sz;
+#endif
+#ifdef DRM_DEBUG_MEMORY
+ int area = DRM_MEM_DMA;
+ int alloc_count;
+ int free_count;
+#endif
+
+ if (!dmah->vaddr) {
+#ifdef DRM_DEBUG_MEMORY
+ DRM_MEM_ERROR(area, "Attempt to free address 0\n");
+#endif
+ } else {
+ /* XXX - Is virt_to_page() legal for consistent mem? */
+ /* Unreserve */
+ for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
+ sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ }
+ dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
+ dmah->busaddr);
+ }
+
+#ifdef DRM_DEBUG_MEMORY
+ spin_lock(&drm_mem_lock);
+ free_count = ++drm_mem_stats[area].free_count;
+ alloc_count = drm_mem_stats[area].succeed_count;
+ drm_mem_stats[area].bytes_freed += size;
+ drm_ram_used -= size;
+ spin_unlock(&drm_mem_lock);
+ if (free_count > alloc_count) {
+ DRM_MEM_ERROR(area,
+ "Excess frees: %d frees, %d allocs\n",
+ free_count, alloc_count);
+ }
+#endif
+
+}
+
+/**
+ * \brief Free a PCI consistent memory block
+ */
+void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
+{
+ __drm_pci_free(dev, dmah);
+ kfree(dmah);
+}
+
+EXPORT_SYMBOL(drm_pci_free);
+
+/*@}*/