On Tue, Feb 18, 2025 at 11:03:53AM +0100, Jacek Lawrynowicz wrote:

From: Tomasz Rusinowicz tomasz.rusinowicz@intel.com

The `struct ttm_resource->placement` contains TTM_PL_FLAG_* flags, but it was incorrectly tested for XE_PL_* flags. This caused xe_dma_buf_pin() to always fail when invoked for the second time. Fix this by checking the `mem_type` field instead.

Fixes: 7764222d54b7 ("drm/xe: Disallow pinning dma-bufs in VRAM") Cc: Thomas Hellström thomas.hellstrom@linux.intel.com Cc: Rodrigo Vivi rodrigo.vivi@intel.com Cc: Lucas De Marchi lucas.demarchi@intel.com Cc: "Thomas Hellström" thomas.hellstrom@linux.intel.com Cc: Michal Wajdeczko michal.wajdeczko@intel.com Cc: Matthew Brost matthew.brost@intel.com Cc: Matthew Auld matthew.auld@intel.com Cc: Nirmoy Das nirmoy.das@intel.com Cc: Jani Nikula jani.nikula@intel.com Cc: intel-xe@lists.freedesktop.org Cc: stable@vger.kernel.org # v6.8+ Signed-off-by: Tomasz Rusinowicz tomasz.rusinowicz@intel.com Signed-off-by: Jacek Lawrynowicz jacek.lawrynowicz@linux.intel.com

---

drivers/gpu/drm/xe/xe_bo.h | 2 -- drivers/gpu/drm/xe/xe_dma_buf.c | 2 +- 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_bo.h b/drivers/gpu/drm/xe/xe_bo.h index d9386ab031404..43bf6f140d40d 100644 --- a/drivers/gpu/drm/xe/xe_bo.h +++ b/drivers/gpu/drm/xe/xe_bo.h @@ -341,7 +341,6 @@ static inline unsigned int xe_sg_segment_size(struct device *dev) return round_down(max / 2, PAGE_SIZE); } -#if IS_ENABLED(CONFIG_DRM_XE_KUNIT_TEST) /**

• xe_bo_is_mem_type - Whether the bo currently resides in the given
• TTM memory type

@@ -356,4 +355,3 @@ static inline bool xe_bo_is_mem_type(struct xe_bo *bo, u32 mem_type) return bo->ttm.resource->mem_type == mem_type; } #endif -#endif diff --git a/drivers/gpu/drm/xe/xe_dma_buf.c b/drivers/gpu/drm/xe/xe_dma_buf.c index c5b95470fa324..f67803e15a0e6 100644 --- a/drivers/gpu/drm/xe/xe_dma_buf.c +++ b/drivers/gpu/drm/xe/xe_dma_buf.c @@ -58,7 +58,7 @@ static int xe_dma_buf_pin(struct dma_buf_attachment *attach) * 1) Avoid pinning in a placement not accessible to some importers. * 2) Pinning in VRAM requires PIN accounting which is a to-do. */

• if (xe_bo_is_pinned(bo) && bo->ttm.resource->placement != XE_PL_TT) {

• if (xe_bo_is_pinned(bo) && !xe_bo_is_mem_type(bo, XE_PL_TT)) {

This fix looks correct. With that: Reviewed-by: Matthew Brost matthew.brost@intel.com

But question for Thomas. I'm thinking as a follow up we rename this variable in TTM to something like placement_flags to avoid confusion like this. What do you think?

Matt

drm_dbg(&xe->drm, "Can't migrate pinned bo for dma-buf pin.\n");
return -EINVAL;

}

2.45.1