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>

1 files changed, 6 insertions, 6 deletions

diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index 03a7c11cb24d..c91fbb68b460 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -526,7 +526,7 @@ struct drm_mm {
  * 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_driver {
                                         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_release(struct inode *inode, struct file *filp);
 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 @@ extern int drm_i_have_hw_lock(struct drm_device *dev, struct drm_file *file_priv
                                 /* 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,