drm: Make drm_local_map use a resource_size_t offset
This changes drm_local_map to use a resource_size for its "offset"
member instead of an unsigned long, thus allowing 32-bit machines
with a >32-bit physical address space to be able to store there
their register or framebuffer addresses when those are above 4G,
such as when using a PCI video card on a recent AMCC 440 SoC.
This patch isn't as "trivial" as it sounds: A few functions needed
to have some unsigned long/int changed to resource_size_t and a few
printk's had to be adjusted.
But also, because userspace isn't capable of passing such offsets,
I had to modify drm_find_matching_map() to ignore the offset passed
in for maps of type _DRM_FRAMEBUFFER or _DRM_REGISTERS.
If we ever support multiple _DRM_FRAMEBUFFER or _DRM_REGISTERS maps
for a given device, we might have to change that trick, but I don't
think that happens on any current driver.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 03a7c11..c91fbb6 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -526,7 +526,7 @@
* Kernel side of a mapping
*/
struct drm_local_map {
- unsigned long offset; /**< Requested physical address (0 for SAREA)*/
+ resource_size_t offset; /**< Requested physical address (0 for SAREA)*/
unsigned long size; /**< Requested physical size (bytes) */
enum drm_map_type type; /**< Type of memory to map */
enum drm_map_flags flags; /**< Flags */
@@ -760,8 +760,8 @@
struct drm_file *file_priv);
void (*reclaim_buffers_idlelocked) (struct drm_device *dev,
struct drm_file *file_priv);
- unsigned long (*get_map_ofs) (struct drm_local_map * map);
- unsigned long (*get_reg_ofs) (struct drm_device *dev);
+ resource_size_t (*get_map_ofs) (struct drm_local_map * map);
+ resource_size_t (*get_reg_ofs) (struct drm_device *dev);
void (*set_version) (struct drm_device *dev,
struct drm_set_version *sv);
@@ -1062,8 +1062,8 @@
extern int drm_mmap(struct file *filp, struct vm_area_struct *vma);
extern int drm_mmap_locked(struct file *filp, struct vm_area_struct *vma);
extern void drm_vm_open_locked(struct vm_area_struct *vma);
-extern unsigned long drm_core_get_map_ofs(struct drm_local_map * map);
-extern unsigned long drm_core_get_reg_ofs(struct drm_device *dev);
+extern resource_size_t drm_core_get_map_ofs(struct drm_local_map * map);
+extern resource_size_t drm_core_get_reg_ofs(struct drm_device *dev);
extern unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait);
/* Memory management support (drm_memory.h) */
@@ -1166,7 +1166,7 @@
/* Buffer management support (drm_bufs.h) */
extern int drm_addbufs_agp(struct drm_device *dev, struct drm_buf_desc * request);
extern int drm_addbufs_pci(struct drm_device *dev, struct drm_buf_desc * request);
-extern int drm_addmap(struct drm_device *dev, unsigned int offset,
+extern int drm_addmap(struct drm_device *dev, resource_size_t offset,
unsigned int size, enum drm_map_type type,
enum drm_map_flags flags, struct drm_local_map **map_ptr);
extern int drm_addmap_ioctl(struct drm_device *dev, void *data,