[PATCH v3 27/30] drm/xe: Basic SVM BO eviction

[Matthew Brost <matthew.brost@intel.com>]

Wire xe_bo_move to GPU SVM migration via new helper xe_svm_bo_evict.

v2:
 - Use xe_svm_bo_evict
 - Drop bo->range
v3:
 - Kernel doc (Thomas)

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
---
 drivers/gpu/drm/xe/xe_svm.c | 14 ++++++++++++++
 drivers/gpu/drm/xe/xe_svm.h |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index a417d8942da4..8780a0b2c81e 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -768,6 +768,20 @@ bool xe_svm_has_mapping(struct xe_vm *vm, u64 start, u64 end)
 	return drm_gpusvm_has_mapping(&vm->svm.gpusvm, start, end);
 }
 
+/**
+ * xe_svm_bo_evict() - SVM evict BO to system memory
+ * @bo: BO to evict
+ *
+ * SVM evict BO to system memory. GPU SVM layer ensures all device pages
+ * are evicted before returning.
+ *
+ * Return: 0 on success standard error code otherwise
+ */
+int xe_svm_bo_evict(struct xe_bo *bo)
+{
+	return drm_gpusvm_evict_to_ram(&bo->devmem_allocation);
+}
+
 #if IS_ENABLED(CONFIG_XE_DEVMEM_MIRROR)
 static struct drm_pagemap_dma_addr
 xe_drm_pagemap_map_dma(struct drm_pagemap *dpagemap,
diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index d549dd9e8641..9e9d333bb9d3 100644
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -56,6 +56,8 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
 
 bool xe_svm_has_mapping(struct xe_vm *vm, u64 start, u64 end);
 
+int xe_svm_bo_evict(struct xe_bo *bo);
+
 static inline bool xe_svm_range_pages_valid(struct xe_svm_range *range)
 {
 	return drm_gpusvm_range_pages_valid(range->base.gpusvm, &range->base);
-- 
2.34.1