[PATCH v2 25/29] drm/xe: Basic SVM BO eviction

[Matthew Brost <matthew.brost@xxxxxxxxx>]

Wire xe_bo_move to GPUSVM migration to SRAM with trylocking of mmap
lock.

v2:
 - Use xe_svm_bo_evict
 - Drop bo->range

Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
 drivers/gpu/drm/xe/xe_bo.c  | 20 ++++++++++++++++++++
 drivers/gpu/drm/xe/xe_svm.c |  5 +++++
 drivers/gpu/drm/xe/xe_svm.h |  3 +++
 3 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_bo.c b/drivers/gpu/drm/xe/xe_bo.c
index dbd03383878e..17d158762e03 100644
--- a/drivers/gpu/drm/xe/xe_bo.c
+++ b/drivers/gpu/drm/xe/xe_bo.c
@@ -25,6 +25,7 @@
 #include "xe_pm.h"
 #include "xe_preempt_fence.h"
 #include "xe_res_cursor.h"
+#include "xe_svm.h"
 #include "xe_trace_bo.h"
 #include "xe_ttm_stolen_mgr.h"
 #include "xe_vm.h"
@@ -250,6 +251,8 @@ int xe_bo_placement_for_flags(struct xe_device *xe, struct xe_bo *bo,
 static void xe_evict_flags(struct ttm_buffer_object *tbo,
 			   struct ttm_placement *placement)
 {
+	struct xe_bo *bo;
+
 	if (!xe_bo_is_xe_bo(tbo)) {
 		/* Don't handle scatter gather BOs */
 		if (tbo->type == ttm_bo_type_sg) {
@@ -261,6 +264,12 @@ static void xe_evict_flags(struct ttm_buffer_object *tbo,
 		return;
 	}
 
+	bo = ttm_to_xe_bo(tbo);
+	if (bo->flags & XE_BO_FLAG_SYSTEM_ALLOC) {
+		*placement = sys_placement;
+		return;
+	}
+
 	/*
 	 * For xe, sg bos that are evicted to system just triggers a
 	 * rebind of the sg list upon subsequent validation to XE_PL_TT.
@@ -738,6 +747,17 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict,
 		}
 	}
 
+	if (!move_lacks_source && (bo->flags & XE_BO_FLAG_SYSTEM_ALLOC) &&
+	    new_mem->mem_type == XE_PL_SYSTEM) {
+		ret = xe_svm_bo_evict(bo);
+		if (!ret) {
+			drm_dbg(&xe->drm, "Evict system allocator BO success\n");
+			ttm_bo_move_null(ttm_bo, new_mem);
+		}
+
+		goto out;
+	}
+
 	if (!move_lacks_source &&
 	    ((old_mem_type == XE_PL_SYSTEM && resource_is_vram(new_mem)) ||
 	     (mem_type_is_vram(old_mem_type) &&
diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 31b80cde15c4..555bc71ae523 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -752,3 +752,8 @@ int xe_devm_add(struct xe_tile *tile, struct xe_mem_region *mr)
 		 tile->id, mr->io_start, mr->io_start + mr->usable_size, res);
 	return 0;
 }
+
+int xe_svm_bo_evict(struct xe_bo *bo)
+{
+	return drm_gpusvm_evict_to_ram(&bo->devmem_allocation);
+}
diff --git a/drivers/gpu/drm/xe/xe_svm.h b/drivers/gpu/drm/xe/xe_svm.h
index 6893664dae70..5b9d5ac9ef72 100644
--- a/drivers/gpu/drm/xe/xe_svm.h
+++ b/drivers/gpu/drm/xe/xe_svm.h
@@ -11,6 +11,7 @@
 
 #define XE_INTERCONNECT_VRAM DRM_INTERCONNECT_DRIVER
 
+struct xe_bo;
 struct xe_mem_region;
 struct xe_tile;
 struct xe_vm;
@@ -35,6 +36,8 @@ int xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
 			    bool atomic);
 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