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Commit bd645e43 authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

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: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 341cb9e4

drivers/gpu/drm/radeon/radeon_gem.c

+12 −7
Original line number Diff line number Diff line
@@ -285,20 +285,25 @@ 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;



	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);



	/* create a gem object to contain this object in */