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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Sep 2026 03:42:13.9831 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: WHYoG3v7BzqU0wHhdC5XVY8+j6soeSQJrfj+ZinnXeoYB7wmGI2twRi8F7fqKzWZT71wtttZF24YkMVym2fZMGeSE7JscblIxqepYy8+zd4= X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR11MB7295 X-OriginatorOrg: intel.com X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" On 26-09-2026 07:29, Matthew Brost wrote: > On Fri, Sep 25, 2026 at 06:56:42PM -0700, Matthew Brost wrote: >> On Tue, Sep 22, 2026 at 10:08:03AM +0530, Himal Prasad Ghimiray wrote: >>> Add xe_svm_devmem_lru_bump() and set it as drm_gpusvm_ctx.devmem_fn in >>> the prefetch worker so each backing BO is moved to the LRU tail during >>> get_pages. >>> >>> v2: >>> - Guard xe_svm_devmem_lru_bump() against foreign device-memory >>> allocations before casting to xe_bo: return early when >>> devmem_allocation->ops != &dpagemap_devmem_ops. A shared >>> device_private_page_owner can hand us another driver's allocation. >>> (Matthew Brost / Sashiko AI review) >>> - Add stub for function (CI) >>> >>> v3: >>> - Guard xe_svm_devmem_lru_bump() body with CONFIG_DRM_XE_PAGEMAP; it >>> references dpagemap_devmem_ops and to_xe_bo(), which only exist when >>> PAGEMAP is enabled. Fixes the build with GPUSVM=y, PAGEMAP=n. >>> (Sashiko AI review) >>> >>> Suggested-by: Matthew Brost >>> Signed-off-by: Himal Prasad Ghimiray >>> --- >>> drivers/gpu/drm/xe/xe_svm.c | 30 ++++++++++++++++++++++++++++++ >>> drivers/gpu/drm/xe/xe_svm.h | 7 +++++++ >>> drivers/gpu/drm/xe/xe_vm.c | 1 + >>> 3 files changed, 38 insertions(+) >>> >>> diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c >>> index f39e647512ad..018836ecbb06 100644 >>> --- a/drivers/gpu/drm/xe/xe_svm.c >>> +++ b/drivers/gpu/drm/xe/xe_svm.c >>> @@ -9,6 +9,7 @@ >>> #include >>> #include >>> #include >>> +#include >>> >>> #include "xe_bo.h" >>> #include "xe_exec_queue_types.h" >>> @@ -1625,6 +1626,35 @@ int xe_svm_range_get_pages(struct xe_vm *vm, struct xe_svm_range *range, >>> return err; >>> } >>> >>> +/** >>> + * xe_svm_devmem_lru_bump() - Move a range's backing BO to the TTM LRU tail >>> + * @devmem_allocation: The device-memory allocation backing the range's pages >>> + * >>> + * Intended as a &drm_gpusvm_ctx.devmem_fn. Runs under the GPUSVM notifier lock; >>> + * the dma-resv trylock avoids inverting against eviction/shrinker, which take >>> + * dma-resv before the notifier lock. A contended BO is simply skipped. >> >> This kernel doc isn't right. >> >> - get_pages() calls ctx.devmem_fn under the notifier >> - the notifier lock is path of reclaim so dma-resv can't be taken under >> the notifier lock > > s/can't be taken under/can't be taken with blocking under/ > > Matt Will fix the kernel doc. > >> - dma-resv also is an outer lock of the notifier when memory is >> allocated + migrated >> - in practice because BO is private (dedicated dma-resv) a trylock >> should always work unless it moving elsewhere, e.g., eviction >> >> Somehow tie this all together into a coherent kernel doc. >> >>> + * >>> + * A shared device_private_page_owner can hand us allocations backed by a >>> + * foreign driver; skip anything that is not an xe BO before casting. >> >> s/xe/Xe >> >> Otherwise LGTM. >> >> Matt >> >>> + */ >>> +void xe_svm_devmem_lru_bump(struct drm_pagemap_devmem *devmem_allocation) >>> +{ >>> +#if IS_ENABLED(CONFIG_DRM_XE_PAGEMAP) >>> + struct xe_bo *bo; >>> + >>> + if (devmem_allocation->ops != &dpagemap_devmem_ops) >>> + return; >>> + >>> + bo = to_xe_bo(devmem_allocation); >>> + >>> + if (!dma_resv_trylock(bo->ttm.base.resv)) >>> + return; >>> + >>> + ttm_bo_move_to_lru_tail_unlocked(&bo->ttm); >>> + dma_resv_unlock(bo->ttm.base.resv); >>> +#endif >>> +} >>> + >>> /** >>> * xe_svm_ranges_zap_ptes_in_range - clear ptes of svm ranges in input range >>> * @vm: Pointer to the xe_vm structure >>> diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h >>> index 2ef4ef026ccd..585ad64b672b 100644 >>> --- a/drivers/gpu/drm/xe/xe_svm.h >>> +++ b/drivers/gpu/drm/xe/xe_svm.h >>> @@ -128,6 +128,8 @@ struct xe_svm_range *xe_svm_range_find_or_insert(struct xe_vm *vm, u64 addr, >>> int xe_svm_range_get_pages(struct xe_vm *vm, struct xe_svm_range *range, >>> struct drm_gpusvm_ctx *ctx); >>> >>> +void xe_svm_devmem_lru_bump(struct drm_pagemap_devmem *devmem_allocation); >>> + >>> bool xe_svm_range_needs_migrate_to_vram(struct xe_svm_range *range, struct xe_vma *vma, >>> const struct drm_pagemap *dpagemap); >>> >>> @@ -356,6 +358,11 @@ int xe_svm_range_get_pages(struct xe_vm *vm, struct xe_svm_range *range, >>> return -EINVAL; >>> } >>> >>> +static inline >>> +void xe_svm_devmem_lru_bump(struct drm_pagemap_devmem *devmem_allocation) >>> +{ >>> +} >>> + >>> static inline struct xe_svm_range *to_xe_range(struct drm_gpusvm_range *r) >>> { >>> return NULL; >>> diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c >>> index 6b793ef31537..0fdc740f1a41 100644 >>> --- a/drivers/gpu/drm/xe/xe_vm.c >>> +++ b/drivers/gpu/drm/xe/xe_vm.c >>> @@ -3260,6 +3260,7 @@ static int prefetch_ranges(struct xe_vm *vm, struct xe_vma_ops *vops, >>> ctx.devmem_possible = devmem_possible; >>> ctx.check_pages_threshold = devmem_possible ? SZ_64K : 0; >>> ctx.device_private_page_owner = xe_svm_private_page_owner(vm, !dpagemap); >>> + ctx.devmem_fn = xe_svm_devmem_lru_bump; >>> >>> skip_threads = op->prefetch_range.ranges_count == 1 || >>> (!dpagemap && !(vops->flags & >>> -- >>> 2.43.0 >>>