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drm/xe: Use ttm_uncached for BO with NEEDS_UC flag

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We should honor requested uncached mode also at the TTM layer.
Otherwise, we risk losing updates to the memory based interrupts
source or status vectors, as those require uncached memory.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240618104947.729-1-michal.wajdeczko@intel.com
This commit is contained in:
Michal Wajdeczko 2024-06-18 12:49:47 +02:00
parent cffd77865f
commit 8e7455dd0d
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/xe/xe_bo.c
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@ -378,6 +378,15 @@ static struct ttm_tt *xe_ttm_tt_create(struct ttm_buffer_object *ttm_bo,
(xe->info.graphics_verx100 >= 1270 && bo->flags & XE_BO_FLAG_PAGETABLE))
caching = ttm_write_combined;
if (bo->flags & XE_BO_FLAG_NEEDS_UC) {
/*
* Valid only for internally-created buffers only, for
* which cpu_caching is never initialized.
*/
xe_assert(xe, bo->cpu_caching == 0);
caching = ttm_uncached;
}
err = ttm_tt_init(&tt->ttm, &bo->ttm, page_flags, caching, extra_pages);
if (err) {
kfree(tt);