[PATCH 3/5] drm/radeon: add userptr flag to directly validate the BO to GTT

[Christian König]

From: Christian K?nig <christian.koe...@amd.com>

This way we test userptr availability at BO creation time instead of first use.

Signed-off-by: Christian K?nig <christian.koenig at amd.com>
---
 drivers/gpu/drm/radeon/radeon_gem.c | 18 +++++++++++++++++-
 include/uapi/drm/radeon_drm.h       |  1 +
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_gem.c 
b/drivers/gpu/drm/radeon/radeon_gem.c
index 032736b..4506560 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -291,7 +291,7 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev, void 
*data,

        /* reject unknown flag values */
        if (args->flags & ~(RADEON_GEM_USERPTR_READONLY |
-           RADEON_GEM_USERPTR_ANONONLY))
+           RADEON_GEM_USERPTR_ANONONLY | RADEON_GEM_USERPTR_VALIDATE))
                return -EINVAL;

        /* readonly pages not tested on older hardware */
@@ -312,6 +312,22 @@ int radeon_gem_userptr_ioctl(struct drm_device *dev, void 
*data,
        if (r)
                goto release_object;

+       if (args->flags & RADEON_GEM_USERPTR_VALIDATE) {
+               down_read(&current->mm->mmap_sem);
+               r = radeon_bo_reserve(bo, true);
+               if (r) {
+                       up_read(&current->mm->mmap_sem);
+                       goto release_object;
+               }
+
+               radeon_ttm_placement_from_domain(bo, RADEON_GEM_DOMAIN_GTT);
+               r = ttm_bo_validate(&bo->tbo, &bo->placement, true, false);
+               radeon_bo_unreserve(bo);
+               up_read(&current->mm->mmap_sem);
+               if (r)
+                       goto release_object;
+       }
+
        r = drm_gem_handle_create(filp, gobj, &handle);
        /* drop reference from allocate - handle holds it now */
        drm_gem_object_unreference_unlocked(gobj);
diff --git a/include/uapi/drm/radeon_drm.h b/include/uapi/drm/radeon_drm.h
index 9720e1a..5dc61c2 100644
--- a/include/uapi/drm/radeon_drm.h
+++ b/include/uapi/drm/radeon_drm.h
@@ -817,6 +817,7 @@ struct drm_radeon_gem_create {
  */
 #define RADEON_GEM_USERPTR_READONLY    (1 << 0)
 #define RADEON_GEM_USERPTR_ANONONLY    (1 << 1)
+#define RADEON_GEM_USERPTR_VALIDATE    (1 << 2)

 struct drm_radeon_gem_userptr {
        uint64_t                addr;
-- 
1.9.1