On Tue, Nov 26, 2024 at 06:13:01PM +0000, Matthew Auld wrote:
On some HW we want to avoid the host caching PTEs, since access from GPU side can be incoherent. However here the special migrate object is mapping PTEs which are written from the host and potentially cached. Use XE_BO_FLAG_PAGETABLE to ensure that non-cached mapping is used, on platforms where this matters.
Fixes: 7a060d786cc1 ("drm/xe/mtl: Map PPGTT as CPU:WC") Signed-off-by: Matthew Auld matthew.auld@intel.com Cc: Matthew Brost matthew.brost@intel.com
Reviewed-by: Matthew Brost matthew.brost@intel.com
Cc: Nirmoy Das nirmoy.das@intel.com Cc: stable@vger.kernel.org # v6.8+
drivers/gpu/drm/xe/xe_migrate.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/xe/xe_migrate.c b/drivers/gpu/drm/xe/xe_migrate.c index 48e205a40fd2..1b97d90aadda 100644 --- a/drivers/gpu/drm/xe/xe_migrate.c +++ b/drivers/gpu/drm/xe/xe_migrate.c @@ -209,7 +209,8 @@ static int xe_migrate_prepare_vm(struct xe_tile *tile, struct xe_migrate *m, num_entries * XE_PAGE_SIZE, ttm_bo_type_kernel, XE_BO_FLAG_VRAM_IF_DGFX(tile) |
XE_BO_FLAG_PINNED);
XE_BO_FLAG_PINNED |XE_BO_FLAG_PAGETABLE);2.47.0