6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Matthew Auld <matthew.auld@xxxxxxxxx>
commit c78f4399188369a55eed69cbf19a8aad2a65ac75 upstream.
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@xxxxxxxxx>
Cc: Matthew Brost <matthew.brost@xxxxxxxxx>
Cc: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v6.8+
Reviewed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Reviewed-by: Matthew Brost <matthew.brost@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20241126181259.159713-4-matthew.auld@xxxxxxxxx
(cherry picked from commit febc689b27d28973cd02f667548a5dca383d859a)
Signed-off-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/xe/xe_migrate.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- 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
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);
if (IS_ERR(bo))
return PTR_ERR(bo);
