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/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
index 0d8bbd7..22f7656 100644
--- a/drivers/gpu/drm/drm_vm.c
+++ b/drivers/gpu/drm/drm_vm.c
@@ -115,9 +115,9 @@
* Using vm_pgoff as a selector forces us to use this unusual
* addressing scheme.
*/
- unsigned long offset = (unsigned long)vmf->virtual_address -
- vma->vm_start;
- unsigned long baddr = map->offset + offset;
+ resource_size_t offset = (unsigned long)vmf->virtual_address -
+ vma->vm_start;
+ resource_size_t baddr = map->offset + offset;
struct drm_agp_mem *agpmem;
struct page *page;
@@ -149,8 +149,10 @@
vmf->page = page;
DRM_DEBUG
- ("baddr = 0x%lx page = 0x%p, offset = 0x%lx, count=%d\n",
- baddr, __va(agpmem->memory->memory[offset]), offset,
+ ("baddr = 0x%llx page = 0x%p, offset = 0x%llx, count=%d\n",
+ (unsigned long long)baddr,
+ __va(agpmem->memory->memory[offset]),
+ (unsigned long long)offset,
page_count(page));
return 0;
}
@@ -512,14 +514,14 @@
return 0;
}
-unsigned long drm_core_get_map_ofs(struct drm_local_map * map)
+resource_size_t drm_core_get_map_ofs(struct drm_local_map * map)
{
return map->offset;
}
EXPORT_SYMBOL(drm_core_get_map_ofs);
-unsigned long drm_core_get_reg_ofs(struct drm_device *dev)
+resource_size_t drm_core_get_reg_ofs(struct drm_device *dev)
{
#ifdef __alpha__
return dev->hose->dense_mem_base - dev->hose->mem_space->start;
@@ -548,7 +550,7 @@
struct drm_file *priv = filp->private_data;
struct drm_device *dev = priv->minor->dev;
struct drm_local_map *map = NULL;
- unsigned long offset = 0;
+ resource_size_t offset = 0;
struct drm_hash_item *hash;
DRM_DEBUG("start = 0x%lx, end = 0x%lx, page offset = 0x%lx\n",
@@ -623,9 +625,9 @@
vma->vm_page_prot))
return -EAGAIN;
DRM_DEBUG(" Type = %d; start = 0x%lx, end = 0x%lx,"
- " offset = 0x%lx\n",
+ " offset = 0x%llx\n",
map->type,
- vma->vm_start, vma->vm_end, map->offset + offset);
+ vma->vm_start, vma->vm_end, (unsigned long long)(map->offset + offset));
vma->vm_ops = &drm_vm_ops;
break;
case _DRM_CONSISTENT: