[RFC PATCH 05/18] drm/ttm: Add option to evict no BOs in operation

[Friedrich Vock]

When undoing evictions because of decreased memory pressure, it makes no
sense to try evicting other buffers.

Signed-off-by: Friedrich Vock <friedrich.vock at gmx.de>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 2 ++
 include/drm/ttm/ttm_bo.h     | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 9a0efbf79316c..3b89fabc2f00a 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -764,6 +764,8 @@ static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
 			break;
 		if (unlikely(ret != -ENOSPC))
 			return ret;
+		if (ctx->no_evict)
+			return -ENOSPC;
 		ret = ttm_mem_evict_first(bdev, man, place, ctx,
 					  ticket);
 		if (unlikely(ret != 0))
diff --git a/include/drm/ttm/ttm_bo.h b/include/drm/ttm/ttm_bo.h
index 8a1a29c6fbc50..a8f21092403d6 100644
--- a/include/drm/ttm/ttm_bo.h
+++ b/include/drm/ttm/ttm_bo.h
@@ -192,6 +192,7 @@ struct ttm_operation_ctx {
 	bool gfp_retry_mayfail;
 	bool allow_res_evict;
 	bool force_alloc;
+	bool no_evict;
 	struct dma_resv *resv;
 	uint64_t bytes_moved;
 };
@@ -358,6 +359,7 @@ static inline void *ttm_kmap_obj_virtual(struct ttm_bo_kmap_obj *map,
 	return map->virtual;
 }

+
 int ttm_bo_wait_ctx(struct ttm_buffer_object *bo,
 		    struct ttm_operation_ctx *ctx);
 int ttm_bo_validate(struct ttm_buffer_object *bo,
--
2.44.0