drm/ttm: remove swap LRU v3

Instead evict round robin from each devices SYSTEM and TT domain.

v2: reorder num_pages access reported by Dan's script
v3: fix rebase fallout, num_pages should be 32bit

Signed-off-by: Christian König <christian.koenig@amd.com>
Tested-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/424009/

drivers/gpu/drm/ttm/ttm_bo.c

@@ -73,7 +73,6 @@ static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
 {
 	struct ttm_device *bdev = bo->bdev;
 
-	list_del_init(&bo->swap);
 	list_del_init(&bo->lru);
 
 	if (bdev->funcs->del_from_lru_notify)
@@ -105,16 +104,6 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 
 	man = ttm_manager_type(bdev, mem->mem_type);
 	list_move_tail(&bo->lru, &man->lru[bo->priority]);
-	if (man->use_tt && bo->ttm &&
-	    !(bo->ttm->page_flags & (TTM_PAGE_FLAG_SG |
-				     TTM_PAGE_FLAG_SWAPPED))) {
-		struct list_head *swap;
-
-		swap = &ttm_glob.swap_lru[bo->priority];
-		list_move_tail(&bo->swap, swap);
-	} else {
-		list_del_init(&bo->swap);
-	}
 
 	if (bdev->funcs->del_from_lru_notify)
 		bdev->funcs->del_from_lru_notify(bo);
@@ -129,9 +118,6 @@ void ttm_bo_move_to_lru_tail(struct ttm_buffer_object *bo,
 			ttm_bo_bulk_move_set_pos(&bulk->vram[bo->priority], bo);
 			break;
 		}
-		if (bo->ttm && !(bo->ttm->page_flags &
-				 (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SWAPPED)))
-			ttm_bo_bulk_move_set_pos(&bulk->swap[bo->priority], bo);
 	}
 }
 EXPORT_SYMBOL(ttm_bo_move_to_lru_tail);
@@ -169,20 +155,6 @@ void ttm_bo_bulk_move_lru_tail(struct ttm_lru_bulk_move *bulk)
 		list_bulk_move_tail(&man->lru[i], &pos->first->lru,
 				    &pos->last->lru);
 	}
-
-	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
-		struct ttm_lru_bulk_move_pos *pos = &bulk->swap[i];
-		struct list_head *lru;
-
-		if (!pos->first)
-			continue;
-
-		dma_resv_assert_held(pos->first->base.resv);
-		dma_resv_assert_held(pos->last->base.resv);
-
-		lru = &ttm_glob.swap_lru[i];
-		list_bulk_move_tail(lru, &pos->first->swap, &pos->last->swap);
-	}
 }
 EXPORT_SYMBOL(ttm_bo_bulk_move_lru_tail);
 
@@ -1065,7 +1037,6 @@ int ttm_bo_init_reserved(struct ttm_device *bdev,
 	kref_init(&bo->kref);
 	INIT_LIST_HEAD(&bo->lru);
 	INIT_LIST_HEAD(&bo->ddestroy);
-	INIT_LIST_HEAD(&bo->swap);
 	bo->bdev = bdev;
 	bo->type = type;
 	bo->mem.mem_type = TTM_PL_SYSTEM;

drivers/gpu/drm/ttm/ttm_bo_util.c

@@ -303,7 +303,6 @@ static int ttm_buffer_object_transfer(struct ttm_buffer_object *bo,
 	atomic_inc(&ttm_glob.bo_count);
 	INIT_LIST_HEAD(&fbo->base.ddestroy);
 	INIT_LIST_HEAD(&fbo->base.lru);
-	INIT_LIST_HEAD(&fbo->base.swap);
 	fbo->base.moving = NULL;
 	drm_vma_node_reset(&fbo->base.base.vma_node);
 

drivers/gpu/drm/ttm/ttm_device.c

@@ -67,7 +67,6 @@ static int ttm_global_init(void)
 	unsigned long num_pages;
 	struct sysinfo si;
 	int ret = 0;
-	unsigned i;
 
 	mutex_lock(&ttm_global_mutex);
 	if (++ttm_glob_use_count > 1)
@@ -90,8 +89,6 @@ static int ttm_global_init(void)
 		goto out;
 	}
 
-	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i)
-		INIT_LIST_HEAD(&glob->swap_lru[i]);
 	INIT_LIST_HEAD(&glob->device_list);
 	atomic_set(&glob->bo_count, 0);
 
@@ -109,27 +106,60 @@ out:
 int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags)
 {
 	struct ttm_global *glob = &ttm_glob;
+	struct ttm_device *bdev;
+	int ret = -EBUSY;
+
+	mutex_lock(&ttm_global_mutex);
+	list_for_each_entry(bdev, &glob->device_list, device_list) {
+		ret = ttm_device_swapout(bdev, ctx, gfp_flags);
+		if (ret > 0) {
+			list_move_tail(&bdev->device_list, &glob->device_list);
+			break;
+		}
+	}
+	mutex_unlock(&ttm_global_mutex);
+	return ret;
+}
+EXPORT_SYMBOL(ttm_global_swapout);
+
+int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
+		       gfp_t gfp_flags)
+{
+	struct ttm_global *glob = &ttm_glob;
+	struct ttm_resource_manager *man;
 	struct ttm_buffer_object *bo;
-	unsigned i;
+	unsigned i, j;
 	int ret;
 
 	spin_lock(&glob->lru_lock);
-	for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
+	for (i = TTM_PL_SYSTEM; i < TTM_NUM_MEM_TYPES; ++i) {
-		list_for_each_entry(bo, &glob->swap_lru[i], swap) {
+		man = ttm_manager_type(bdev, i);
-			uint32_t num_pages = bo->ttm->num_pages;
+		if (!man || !man->use_tt)
+			continue;
 
-			ret = ttm_bo_swapout(bo, ctx, gfp_flags);
+		for (j = 0; j < TTM_MAX_BO_PRIORITY; ++j) {
-			/* ttm_bo_swapout has dropped the lru_lock */
+			list_for_each_entry(bo, &man->lru[j], lru) {
-			if (!ret)
+				uint32_t num_pages;
-				return num_pages;
+
-			if (ret != -EBUSY)
+				if (!bo->ttm ||
-				return ret;
+				    bo->ttm->page_flags & TTM_PAGE_FLAG_SG ||
+				    bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)
+					continue;
+
+				num_pages = bo->ttm->num_pages;
+				ret = ttm_bo_swapout(bo, ctx, gfp_flags);
+				/* ttm_bo_swapout has dropped the lru_lock */
+				if (!ret)
+					return num_pages;
+				if (ret != -EBUSY)
+					return ret;
+			}
 		}
 	}
 	spin_unlock(&glob->lru_lock);
 	return 0;
 }
-EXPORT_SYMBOL(ttm_global_swapout);
+EXPORT_SYMBOL(ttm_device_swapout);
 
 static void ttm_init_sysman(struct ttm_device *bdev)
 {

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

@@ -1371,7 +1371,7 @@ static int vmw_pm_freeze(struct device *kdev)
 	vmw_execbuf_release_pinned_bo(dev_priv);
 	vmw_resource_evict_all(dev_priv);
 	vmw_release_device_early(dev_priv);
-	while (ttm_global_swapout(&ctx, GFP_KERNEL) > 0);
+	while (ttm_device_swapout(&dev_priv->bdev, &ctx, GFP_KERNEL) > 0);
 	if (dev_priv->enable_fb)
 		vmw_fifo_resource_dec(dev_priv);
 	if (atomic_read(&dev_priv->num_fifo_resources) != 0) {

include/drm/ttm/ttm_bo_api.h

@@ -144,7 +144,6 @@ struct ttm_buffer_object {
 
 	struct list_head lru;
 	struct list_head ddestroy;
-	struct list_head swap;
 
 	/**
 	 * Members protected by a bo reservation.

include/drm/ttm/ttm_bo_driver.h

@@ -69,7 +69,6 @@ struct ttm_lru_bulk_move_pos {
 struct ttm_lru_bulk_move {
 	struct ttm_lru_bulk_move_pos tt[TTM_MAX_BO_PRIORITY];
 	struct ttm_lru_bulk_move_pos vram[TTM_MAX_BO_PRIORITY];
-	struct ttm_lru_bulk_move_pos swap[TTM_MAX_BO_PRIORITY];
 };
 
 /*

include/drm/ttm/ttm_device.h

@@ -63,11 +63,6 @@ extern struct ttm_global {
 	 */
 	struct list_head device_list;
 
-	/**
-	 * Protected by the lru_lock.
-	 */
-	struct list_head swap_lru[TTM_MAX_BO_PRIORITY];
-
 	/**
 	 * Internal protection.
 	 */
@@ -298,6 +293,8 @@ struct ttm_device {
 };
 
 int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags);
+int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,
+		       gfp_t gfp_flags);
 
 static inline struct ttm_resource_manager *
 ttm_manager_type(struct ttm_device *bdev, int mem_type)