On Fri, Nov 01, 2024 at 03:47:26PM +0000, Matthew Auld wrote:
The GGTT looks to be stored inside stolen memory on igpu which is not treated as normal RAM. The core kernel skips this memory range when creating the hibernation image, therefore when coming back from hibernation the GGTT programming is lost. This seems to cause issues with broken resume where GuC FW fails to load:
[drm] *ERROR* GT0: load failed: status = 0x400000A0, time = 10ms, freq = 1250MHz (req 1300MHz), done = -1 [drm] *ERROR* GT0: load failed: status: Reset = 0, BootROM = 0x50, UKernel = 0x00, MIA = 0x00, Auth = 0x01 [drm] *ERROR* GT0: firmware signature verification failed [drm] *ERROR* CRITICAL: Xe has declared device 0000:00:02.0 as wedged.
Current GGTT users are kernel internal and tracked as pinned, so it should be possible to hook into the existing save/restore logic that we use for dgpu, where the actual evict is skipped but on restore we importantly restore the GGTT programming. This has been confirmed to fix hibernation on at least ADL and MTL, though likely all igpu platforms are affected.
This also means we have a hole in our testing, where the existing s4 tests only really test the driver hooks, and don't go as far as actually rebooting and restoring from the hibernation image and in turn powering down RAM (and therefore losing the contents of stolen).
Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs") Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/3275 Signed-off-by: Matthew Auld matthew.auld@intel.com Cc: Matthew Brost matthew.brost@intel.com Cc: stable@vger.kernel.org # v6.8+
drivers/gpu/drm/xe/xe_bo.c | 36 ++++++++++++++------------------ drivers/gpu/drm/xe/xe_bo_evict.c | 6 ------ 2 files changed, 16 insertions(+), 26 deletions(-)
diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c index d79d8ef5c7d5..0ae5c8f7bab8 100644 --- a/drivers/gpu/drm/xe/xe_bo.c +++ b/drivers/gpu/drm/xe/xe_bo.c @@ -950,7 +950,10 @@ int xe_bo_restore_pinned(struct xe_bo *bo) if (WARN_ON(!xe_bo_is_pinned(bo))) return -EINVAL;
- if (WARN_ON(xe_bo_is_vram(bo) || !bo->ttm.ttm))
- if (WARN_ON(xe_bo_is_vram(bo)))
return -EINVAL;- if (WARN_ON(!bo->ttm.ttm && !xe_bo_is_stolen(bo))) return -EINVAL;
if (!mem_type_is_vram(place->mem_type)) @@ -1770,6 +1773,7 @@ int xe_bo_pin_external(struct xe_bo *bo) int xe_bo_pin(struct xe_bo *bo) {
- struct ttm_place *place = &(bo->placements[0]);
Checkpatch will complain about this (extra parentheses).
struct xe_device *xe = xe_bo_device(bo); int err; @@ -1800,7 +1804,6 @@ int xe_bo_pin(struct xe_bo *bo) */ if (IS_DGFX(xe) && !(IS_ENABLED(CONFIG_DRM_XE_DEBUG) && bo->flags & XE_BO_FLAG_INTERNAL_TEST)) {
struct ttm_place *place = &(bo->placements[0]);
I think you have an extra line.
if (mem_type_is_vram(place->mem_type)) { xe_assert(xe, place->flags & TTM_PL_FLAG_CONTIGUOUS);@@ -1809,13 +1812,12 @@ int xe_bo_pin(struct xe_bo *bo) vram_region_gpu_offset(bo->ttm.resource)) >> PAGE_SHIFT; place->lpfn = place->fpfn + (bo->size >> PAGE_SHIFT); }
- }
if (mem_type_is_vram(place->mem_type) ||bo->flags & XE_BO_FLAG_GGTT) {spin_lock(&xe->pinned.lock);list_add_tail(&bo->pinned_link, &xe->pinned.kernel_bo_present);spin_unlock(&xe->pinned.lock);}
- if (mem_type_is_vram(place->mem_type) || bo->flags & XE_BO_FLAG_GGTT) {
spin_lock(&xe->pinned.lock);list_add_tail(&bo->pinned_link, &xe->pinned.kernel_bo_present);spin_unlock(&xe->pinned.lock);ttm_bo_pin(&bo->ttm); @@ -1863,24 +1865,18 @@ void xe_bo_unpin_external(struct xe_bo *bo) void xe_bo_unpin(struct xe_bo *bo) {
- struct ttm_place *place = &(bo->placements[0]);
Same here.
struct xe_device *xe = xe_bo_device(bo); xe_assert(xe, !bo->ttm.base.import_attach); xe_assert(xe, xe_bo_is_pinned(bo));
- if (IS_DGFX(xe) && !(IS_ENABLED(CONFIG_DRM_XE_DEBUG) &&
bo->flags & XE_BO_FLAG_INTERNAL_TEST)) {struct ttm_place *place = &(bo->placements[0]);if (mem_type_is_vram(place->mem_type) ||bo->flags & XE_BO_FLAG_GGTT) {spin_lock(&xe->pinned.lock);xe_assert(xe, !list_empty(&bo->pinned_link));list_del_init(&bo->pinned_link);spin_unlock(&xe->pinned.lock);}
- if (mem_type_is_vram(place->mem_type) || bo->flags & XE_BO_FLAG_GGTT) {
spin_lock(&xe->pinned.lock);xe_assert(xe, !list_empty(&bo->pinned_link));list_del_init(&bo->pinned_link);spin_unlock(&xe->pinned.lock);
- ttm_bo_unpin(&bo->ttm);
} diff --git a/drivers/gpu/drm/xe/xe_bo_evict.c b/drivers/gpu/drm/xe/xe_bo_evict.c index 32043e1e5a86..b01bc20eb90b 100644 --- a/drivers/gpu/drm/xe/xe_bo_evict.c +++ b/drivers/gpu/drm/xe/xe_bo_evict.c @@ -34,9 +34,6 @@ int xe_bo_evict_all(struct xe_device *xe) u8 id; int ret;
- if (!IS_DGFX(xe))
return 0;- /* User memory */ for (mem_type = XE_PL_VRAM0; mem_type <= XE_PL_VRAM1; ++mem_type) { struct ttm_resource_manager *man =
@@ -125,9 +122,6 @@ int xe_bo_restore_kernel(struct xe_device *xe) struct xe_bo *bo; int ret;
- if (!IS_DGFX(xe))
return 0;
Aside from the NITs, LGTM.
With that: Reviewed-by: Matthew Brost matthew.brost@intel.com
spin_lock(&xe->pinned.lock); for (;;) { bo = list_first_entry_or_null(&xe->pinned.evicted, -- 2.47.0