drm/ttm: enable swapout for reserved BOs during allocation

if the bo shares same reservation object then not lock it again
at swapout time to make it possible to swap out.

v2: refine the commmit message

Reviewed-by: Thomas Hellström <thellstrom@vmware.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chuming Zhou <david1.zhou@amd.com>
Signed-off-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 21 insertions, 9 deletions

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index ac2ab20ba9b2..2eb71ffe95a6 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1699,18 +1699,20 @@ EXPORT_SYMBOL(ttm_bo_synccpu_write_release);
  * A buffer object shrink method that tries to swap out the first
  * buffer object on the bo_global::swap_lru list.
  */
-int ttm_bo_swapout(struct ttm_bo_global *glob)
+int ttm_bo_swapout(struct ttm_bo_global *glob, struct ttm_operation_ctx *ctx)
 {
         struct ttm_buffer_object *bo;
         int ret = -EBUSY;
+        bool locked;
         unsigned i;
 
         spin_lock(&glob->lru_lock);
         for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
                 list_for_each_entry(bo, &glob->swap_lru[i], swap) {
-                        ret = reservation_object_trylock(bo->resv) ? 0 : -EBUSY;
-                        if (!ret)
+                        if (ttm_bo_evict_swapout_allowable(bo, ctx, &locked)) {
+                                ret = 0;
                                 break;
+                        }
                 }
                 if (!ret)
                         break;
@@ -1786,7 +1788,12 @@ EXPORT_SYMBOL(ttm_bo_swapout);
 
 void ttm_bo_swapout_all(struct ttm_bo_device *bdev)
 {
-        while (ttm_bo_swapout(bdev->glob) == 0)
+        struct ttm_operation_ctx ctx = {
+                .interruptible = false,
+                .no_wait_gpu = false
+        };
+
+        while (ttm_bo_swapout(bdev->glob, &ctx) == 0)
                 ;
 }
 EXPORT_SYMBOL(ttm_bo_swapout_all);
diff --git a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c
index 102b326d3c42..aa0c38136958 100644
--- a/drivers/gpu/drm/ttm/ttm_memory.c
+++ b/drivers/gpu/drm/ttm/ttm_memory.c
@@ -211,7 +211,7 @@ static bool ttm_zones_above_swap_target(struct ttm_mem_global *glob,
  */
 
 static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
-                       uint64_t extra)
+                        uint64_t extra, struct ttm_operation_ctx *ctx)
 {
         int ret;
 
@@ -219,7 +219,7 @@ static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
 
         while (ttm_zones_above_swap_target(glob, from_wq, extra)) {
                 spin_unlock(&glob->lock);
-                ret = ttm_bo_swapout(glob->bo_glob);
+                ret = ttm_bo_swapout(glob->bo_glob, ctx);
                 spin_lock(&glob->lock);
                 if (unlikely(ret != 0))
                         break;
@@ -230,10 +230,14 @@ static void ttm_shrink(struct ttm_mem_global *glob, bool from_wq,
 
 static void ttm_shrink_work(struct work_struct *work)
 {
+        struct ttm_operation_ctx ctx = {
+                .interruptible = false,
+                .no_wait_gpu = false
+        };
         struct ttm_mem_global *glob =
             container_of(work, struct ttm_mem_global, work);
 
-        ttm_shrink(glob, true, 0ULL);
+        ttm_shrink(glob, true, 0ULL, &ctx);
 }
 
 static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
@@ -520,7 +524,7 @@ static int ttm_mem_global_alloc_zone(struct ttm_mem_global *glob,
                         return -ENOMEM;
                 if (unlikely(count-- == 0))
                         return -ENOMEM;
-                ttm_shrink(glob, false, memory + (memory >> 2) + 16);
+                ttm_shrink(glob, false, memory + (memory >> 2) + 16, ctx);
         }
 
         return 0;
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 24a8db7bebb1..f1c74c22248b 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -752,7 +752,8 @@ ssize_t ttm_bo_io(struct ttm_bo_device *bdev, struct file *filp,
                   const char __user *wbuf, char __user *rbuf,
                   size_t count, loff_t *f_pos, bool write);
 
-int ttm_bo_swapout(struct ttm_bo_global *glob);
+int ttm_bo_swapout(struct ttm_bo_global *glob,
+                        struct ttm_operation_ctx *ctx);
 void ttm_bo_swapout_all(struct ttm_bo_device *bdev);
 int ttm_bo_wait_unreserved(struct ttm_buffer_object *bo);
 #endif