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.

1 files changed, 18 insertions, 1 deletions

diff --git a/linux-core/drm_bufs.c b/linux-core/drm_bufs.c
index 947042bf..ce51397a 100644
--- a/linux-core/drm_bufs.c
+++ b/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);
 	}