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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>
This commit is contained in:
Christian König 2014-08-07 09:36:04 +02:00 committed by Alex Deucher
parent 341cb9e426
commit bd645e4314
1 changed files with 12 additions and 7 deletions
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19
drivers/gpu/drm/radeon/radeon_gem.c
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@ -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);