drm: update support for drm pci buffers

The DRM needs to change the drm_pci interface for FreeBSD compatiblity,
this patch introduces the drm_dma_handle_t and uses it in the Linux code.

From: Tonnerre Lombard, Eric Anholt, and Sergey Vlasov
Signed-off-by: David Airlie <airlied@linux.ie>

1 files changed, 33 insertions, 12 deletions

diff --git a/drivers/char/drm/drm_pci.c b/drivers/char/drm/drm_pci.c
index 192e8762571c..3e452e8967fa 100644
--- a/drivers/char/drm/drm_pci.c
+++ b/drivers/char/drm/drm_pci.c
@@ -46,10 +46,10 @@
 /**
  * \brief Allocate a PCI consistent memory block, for DMA.
  */
-void *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
-                    dma_addr_t maxaddr, dma_addr_t * busaddr)
+drm_dma_handle_t *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
+                                dma_addr_t maxaddr)
 {
-        void *address;
+        drm_dma_handle_t *dmah;
 #if DRM_DEBUG_MEMORY
         int area = DRM_MEM_DMA;
 
@@ -74,13 +74,19 @@ void *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
                 return NULL;
         }
 
-        address = pci_alloc_consistent(dev->pdev, size, busaddr);
+        dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
+        if (!dmah)
+                return NULL;
+        
+        dmah->size = size;
+        dmah->vaddr = pci_alloc_consistent(dev->pdev, size, &dmah->busaddr);
 
 #if DRM_DEBUG_MEMORY
-        if (address == NULL) {
+        if (dmah->vaddr == NULL) {
                 spin_lock(&drm_mem_lock);
                 ++drm_mem_stats[area].fail_count;
                 spin_unlock(&drm_mem_lock);
+                kfree(dmah);
                 return NULL;
         }
 
@@ -90,21 +96,25 @@ void *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
         drm_ram_used += size;
         spin_unlock(&drm_mem_lock);
 #else
-        if (address == NULL)
+        if (dmah->vaddr == NULL) {
+                kfree(dmah);
                 return NULL;
+        }
 #endif
 
-        memset(address, 0, size);
+        memset(dmah->vaddr, 0, size);
 
-        return address;
+        return dmah;
 }
 EXPORT_SYMBOL(drm_pci_alloc);
 
 /**
- * \brief Free a PCI consistent memory block.
+ * \brief Free a PCI consistent memory block with freeing its descriptor.
+ *
+ * This function is for internal use in the Linux-specific DRM core code.
  */
 void
-drm_pci_free(drm_device_t * dev, size_t size, void *vaddr, dma_addr_t busaddr)
+__drm_pci_free(drm_device_t * dev, drm_dma_handle_t *dmah)
 {
 #if DRM_DEBUG_MEMORY
         int area = DRM_MEM_DMA;
@@ -112,12 +122,13 @@ drm_pci_free(drm_device_t * dev, size_t size, void *vaddr, dma_addr_t busaddr)
         int free_count;
 #endif
 
-        if (!vaddr) {
+        if (!dmah->vaddr) {
 #if DRM_DEBUG_MEMORY
                 DRM_MEM_ERROR(area, "Attempt to free address 0\n");
 #endif
         } else {
-                pci_free_consistent(dev->pdev, size, vaddr, busaddr);
+                pci_free_consistent(dev->pdev, dmah->size, dmah->vaddr,
+                                    dmah->busaddr);
         }
 
 #if DRM_DEBUG_MEMORY
@@ -135,6 +146,16 @@ drm_pci_free(drm_device_t * dev, size_t size, void *vaddr, dma_addr_t busaddr)
 #endif
 
 }
+
+/**
+ * \brief Free a PCI consistent memory block
+ */
+void
+drm_pci_free(drm_device_t *dev, drm_dma_handle_t *dmah)
+{
+        __drm_pci_free(dev, dmah);
+        kfree(dmah);
+}
 EXPORT_SYMBOL(drm_pci_free);
 
 /*@}*/