Commit 6275362f authored by Himal Prasad Ghimiray's avatar Himal Prasad Ghimiray
Browse files

drm/xe/svm: Add xe_svm_range_validate() and xe_svm_range_migrate_to_smem() 



The xe_svm_range_validate() function checks if a range is
valid and located in the desired memory region.

xe_svm_range_migrate_to_smem() checks if range have pages in devmem and
migrate them to smem.

v2
- Fix function stub in xe_svm.h
- Fix doc

v3 (Matthew Brost)
- Remove extra new line
- s/range->base.flags.has_devmem_pages/xe_svm_range_in_vram

v4 (Matthew Brost)
- s/xe_svm_range_in_vram/range->base.flags.has_devmem_pages
- Move eviction logic to separate function

Reviewed-by: default avatarMatthew Brost <matthew.brost@intel.com>
Acked-by: default avatarThomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://lore.kernel.org/r/20250513040228.470682-12-himal.prasad.ghimiray@intel.com


Signed-off-by: default avatarHimal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
parent cc795e04

drivers/gpu/drm/xe/xe_svm.c

+41 −0
Original line number Diff line number Diff line
@@ -651,6 +651,47 @@ static bool xe_svm_range_is_valid(struct xe_svm_range *range, 
		(!devmem_only || xe_svm_range_in_vram(range));

}



/** xe_svm_range_migrate_to_smem() - Move range pages from VRAM to SMEM

 * @vm: xe_vm pointer

 * @range: Pointer to the SVM range structure

 *

 * The xe_svm_range_migrate_to_smem() checks range has pages in VRAM

 * and migrates them to SMEM

 */

void xe_svm_range_migrate_to_smem(struct xe_vm *vm, struct xe_svm_range *range)

{

	if (xe_svm_range_in_vram(range))

		drm_gpusvm_range_evict(&vm->svm.gpusvm, &range->base);

}



/**

 * xe_svm_range_validate() - Check if the SVM range is valid

 * @vm: xe_vm pointer

 * @range: Pointer to the SVM range structure

 * @tile_mask: Mask representing the tiles to be checked

 * @devmem_preferred : if true range needs to be in devmem

 *

 * The xe_svm_range_validate() function checks if a range is

 * valid and located in the desired memory region.

 *

 * Return: true if the range is valid, false otherwise

 */

bool xe_svm_range_validate(struct xe_vm *vm,

			   struct xe_svm_range *range,

			   u8 tile_mask, bool devmem_preferred)

{

	bool ret;



	xe_svm_notifier_lock(vm);



	ret = (range->tile_present & ~range->tile_invalidated & tile_mask) == tile_mask &&

	       (devmem_preferred == range->base.flags.has_devmem_pages);



	xe_svm_notifier_unlock(vm);



	return ret;

}



#if IS_ENABLED(CONFIG_DRM_XE_DEVMEM_MIRROR)

static struct xe_vram_region *tile_to_vr(struct xe_tile *tile)

{

drivers/gpu/drm/xe/xe_svm.h

+19 −0
Original line number Diff line number Diff line
@@ -83,6 +83,12 @@ int xe_svm_range_get_pages(struct xe_vm *vm, struct xe_svm_range *range, 
bool xe_svm_range_needs_migrate_to_vram(struct xe_svm_range *range, struct xe_vma *vma,

					bool preferred_region_is_vram);



void xe_svm_range_migrate_to_smem(struct xe_vm *vm, struct xe_svm_range *range);



bool xe_svm_range_validate(struct xe_vm *vm,

			   struct xe_svm_range *range,

			   u8 tile_mask, bool devmem_preferred);



/**

 * xe_svm_range_has_dma_mapping() - SVM range has DMA mapping

 * @range: SVM range
@@ -278,6 +284,19 @@ bool xe_svm_range_needs_migrate_to_vram(struct xe_svm_range *range, struct xe_vm 
	return false;

}



static inline

void xe_svm_range_migrate_to_smem(struct xe_vm *vm, struct xe_svm_range *range)

{

}



static inline

bool xe_svm_range_validate(struct xe_vm *vm,

			   struct xe_svm_range *range,

			   u8 tile_mask, bool devmem_preferred)

{

	return false;

}



#define xe_svm_assert_in_notifier(...) do {} while (0)

#define xe_svm_range_has_dma_mapping(...) false