Added a new DRM map type _DRM_CONSISTENT for consistent PCI memory. It uses

drm_pci_alloc/free for allocating/freeing the memory. Only implemented
    in the Linux DRM so far.

libdrm/xf86drm.h

@@ -104,7 +104,8 @@ typedef enum {
     DRM_REGISTERS       = 1,      /**< no caching, no core dump */
     DRM_SHM             = 2,      /**< shared, cached */
     DRM_AGP             = 3,	  /**< AGP/GART */
-    DRM_SCATTER_GATHER  = 4	  /**< PCI scatter/gather */
+    DRM_SCATTER_GATHER  = 4,	  /**< PCI scatter/gather */
+    DRM_CONSISTENT      = 5	  /**< PCI consistent */
 } drmMapType;
 
 typedef enum {

linux-core/drm_bufs.c

@@ -244,7 +244,21 @@ int drm_addmap(struct inode *inode, struct file *filp,
 		}
 		map->offset += dev->sg->handle;
 		break;
-
+	case _DRM_CONSISTENT: {
+		/* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G.
+		 * As we're limiting the address to 2^32-1 (or less),
+		 * casting it down to 32 bits is no problem, but we
+		 * need to point to a 64bit variable first. */
+		dma_addr_t bus_addr;
+		map->handle = drm_pci_alloc(dev, map->size, map->size,
+					    0xffffffffUL, &bus_addr);
+		map->offset = (unsigned long)bus_addr;
+		if (!map->handle) {
+			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+			return -ENOMEM;
+		}
+		break;
+	}
 	default:
 		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 		return -EINVAL;
@@ -348,6 +362,9 @@ int drm_rmmap(struct inode *inode, struct file *filp,
 		case _DRM_AGP:
 		case _DRM_SCATTER_GATHER:
 			break;
+		case _DRM_CONSISTENT:
+			drm_pci_free(dev, map->size, map->handle, map->offset);
+			break;
 		}
 		drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 	}

linux-core/drm_drv.c

@@ -227,6 +227,10 @@ int drm_takedown(drm_device_t * dev)
 						dev->sg = NULL;
 					}
 					break;
+				case _DRM_CONSISTENT:
+					drm_pci_free(dev, map->size,
+						     map->handle, map->offset);
+					break;
 				}
 				drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 			}
@@ -396,6 +400,7 @@ static void __exit drm_cleanup(drm_device_t * dev)
 				case _DRM_SHM:
 				case _DRM_AGP:
 				case _DRM_SCATTER_GATHER:
+				case _DRM_CONSISTENT:
 					DRM_DEBUG("Extra maplist item\n");
 					break;
 				}

linux-core/drm_pci.c

@@ -6,7 +6,6 @@
  * \warning These interfaces aren't stable yet.
  *
  * \todo Implement the remaining ioctl's for the PCI pools.
- * \todo Add support to map these buffers.
  * \todo The wrappers here are so thin that they would be better off inlined..
  *
  * \author Jose Fonseca <jrfonseca@tungstengraphics.com>

linux-core/drm_proc.c

@@ -211,9 +211,9 @@ static int drm__vm_info(char *buf, char **start, off_t offset, int request,
 	struct list_head *list;
 
 	/* Hardcoded from _DRM_FRAME_BUFFER,
-	   _DRM_REGISTERS, _DRM_SHM, _DRM_AGP, and
+	   _DRM_REGISTERS, _DRM_SHM, _DRM_AGP,
-	   _DRM_SCATTER_GATHER. */
+	   _DRM_SCATTER_GATHER, and _DRM_CONSISTENT. */
-	const char *types[] = { "FB", "REG", "SHM", "AGP", "SG" };
+	const char *types[] = { "FB", "REG", "SHM", "AGP", "SG", "PCI" };
 	const char *type;
 	int i;
 
@@ -234,7 +234,7 @@ static int drm__vm_info(char *buf, char **start, off_t offset, int request,
 		map = r_list->map;
 		if (!map)
 			continue;
-		if (map->type < 0 || map->type > 4)
+		if (map->type < 0 || map->type > 5)
 			type = "??";
 		else
 			type = types[map->type];

linux-core/drm_vm.c

@@ -232,6 +232,10 @@ void drm_vm_shm_close(struct vm_area_struct *vma)
 			case _DRM_AGP:
 			case _DRM_SCATTER_GATHER:
 				break;
+			case _DRM_CONSISTENT:
+				drm_pci_free(dev, map->size, map->handle,
+					     map->offset);
+				break;
 			}
 			drm_free(map, sizeof(*map), DRM_MEM_MAPS);
 		}
@@ -658,6 +662,9 @@ int drm_mmap(struct file *filp, struct vm_area_struct *vma)
 		vma->vm_ops = &drm_vm_ops;
 		break;
 	case _DRM_SHM:
+	case _DRM_CONSISTENT:
+		/* Consistent memory is really like shared memory. It's only
+		 * allocated in a different way. */
 		vma->vm_ops = &drm_vm_shm_ops;
 		vma->vm_private_data = (void *)map;
 		/* Don't let this area swap.  Change when

shared-core/drm.h

@@ -246,7 +246,8 @@ typedef enum drm_map_type {
 	_DRM_REGISTERS = 1,	  /**< no caching, no core dump */
 	_DRM_SHM = 2,		  /**< shared, cached */
 	_DRM_AGP = 3,		  /**< AGP/GART */
-	_DRM_SCATTER_GATHER = 4	  /**< Scatter/gather memory for PCI DMA */
+	_DRM_SCATTER_GATHER = 4,  /**< Scatter/gather memory for PCI DMA */
+	_DRM_CONSISTENT = 5	  /**< Consistent memory for PCI DMA */
 } drm_map_type_t;
 
 /**