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: Matthew Brost <matthew.brost@intel.com>
Acked-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://lore.kernel.org/r/20250513040228.470682-12-himal.prasad.ghimiray@intel.com
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>

diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index c6505350c8ffdef9a450adac11324c69410a80a6..248f615a343e63ce346abe0c3adb7f6f28011d93 100644 (file)
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -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)
 {

diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index 0ee845e35b3eec35248e8ee87a0e9132cd86e755..42be9e5d044450c750a5dcf97721227418def685 100644 (file)
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -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