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authorChristian König <christian.koenig@amd.com>2014-08-07 09:36:04 +0200
committerAlex Deucher <alexander.deucher@amd.com>2014-08-11 11:04:26 -0400
commitbd645e4314b95b21146aa6ff893d783de20c4e60 (patch)
treef047909ba16d95245f7ed22f7c58e121ee51749c /drivers/gpu/drm/radeon
parent341cb9e426fac32523427c80c67543a16be46605 (diff)
downloadblackbird-op-linux-bd645e4314b95b21146aa6ff893d783de20c4e60.tar.gz
blackbird-op-linux-bd645e4314b95b21146aa6ff893d783de20c4e60.zip
drm/radeon: allow userptr write access under certain conditions
It needs to be anonymous memory (no file mappings) and we are requried to install an MMU notifier. Signed-off-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon')
-rw-r--r--drivers/gpu/drm/radeon/radeon_gem.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index 2a6fbf101cf0..01b58941acd4 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -285,19 +285,24 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev, void *data,
if (offset_in_page(args->addr | args->size))
return -EINVAL;
- /* we only support read only mappings for now */
- if (!(args->flags & RADEON_GEM_USERPTR_READONLY))
- return -EACCES;
-
/* reject unknown flag values */
if (args->flags & ~(RADEON_GEM_USERPTR_READONLY |
RADEON_GEM_USERPTR_ANONONLY | RADEON_GEM_USERPTR_VALIDATE |
RADEON_GEM_USERPTR_REGISTER))
return -EINVAL;
- /* readonly pages not tested on older hardware */
- if (rdev->family < CHIP_R600)
- return -EINVAL;
+ if (args->flags & RADEON_GEM_USERPTR_READONLY) {
+ /* readonly pages not tested on older hardware */
+ if (rdev->family < CHIP_R600)
+ return -EINVAL;
+
+ } else if (!(args->flags & RADEON_GEM_USERPTR_ANONONLY) ||
+ !(args->flags & RADEON_GEM_USERPTR_REGISTER)) {
+
+ /* if we want to write to it we must require anonymous
+ memory and install a MMU notifier */
+ return -EACCES;
+ }
down_read(&rdev->exclusive_lock);
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