drm: add _DRM_CONSISTENT map type
Added a new DRM map type _DRM_CONSISTENT for consistent PCI memory. It
uses drm_pci_alloc/free for allocating/freeing the memory.
From: Felix Kuhling <fxkuehl@gmx.de>
Signed-off-by: David Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c
index 4c6191d..89f301f 100644
--- a/drivers/char/drm/drm_bufs.c
+++ b/drivers/char/drm/drm_bufs.c
@@ -180,7 +180,22 @@
}
map->offset += dev->sg->handle;
break;
-
+ case _DRM_CONSISTENT:
+ {
+ /* dma_addr_t is 64bit on i386 with CONFIG_HIGHMEM64G,
+ * As we're limit the address to 2^32-1 (or lses),
+ * 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;
@@ -291,6 +306,9 @@
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);
}