drm/ttm: optionally move duplicates to a separate list

This patch adds an optional list_head parameter to ttm_eu_reserve_buffers.
If specified duplicates in the execbuf list are no longer reported as errors,
but moved to this list instead.

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

7 files changed, 26 insertions, 8 deletions

diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index 446e71ca36cb..d9b25684ac98 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -264,7 +264,8 @@ int qxl_release_reserve_list(struct qxl_release *release, bool no_intr)
         if (list_is_singular(&release->bos))
                 return 0;
 
-        ret = ttm_eu_reserve_buffers(&release->ticket, &release->bos, !no_intr);
+        ret = ttm_eu_reserve_buffers(&release->ticket, &release->bos,
+                                     !no_intr, NULL);
         if (ret)
                 return ret;
 
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index 6162bd29a598..fe48f229043e 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -564,7 +564,7 @@ static void radeon_gem_va_update_vm(struct radeon_device *rdev,
         if (!vm_bos)
                 return;
 
-        r = ttm_eu_reserve_buffers(&ticket, &list, true);
+        r = ttm_eu_reserve_buffers(&ticket, &list, true, NULL);
         if (r)
                 goto error_free;
 
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 4ab07473bb28..a4a3ac824b45 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -508,7 +508,7 @@ int radeon_bo_list_validate(struct radeon_device *rdev,
         u64 bytes_moved = 0, initial_bytes_moved;
         u64 bytes_moved_threshold = radeon_bo_get_threshold_for_moves(rdev);
 
-        r = ttm_eu_reserve_buffers(ticket, head, true);
+        r = ttm_eu_reserve_buffers(ticket, head, true, NULL);
         if (unlikely(r != 0)) {
                 return r;
         }
diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index 8ce508e76208..3820ae97a030 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -93,7 +93,8 @@ EXPORT_SYMBOL(ttm_eu_backoff_reservation);
  */
 
 int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
-                           struct list_head *list, bool intr)
+                           struct list_head *list, bool intr,
+                           struct list_head *dups)
 {
         struct ttm_bo_global *glob;
         struct ttm_validate_buffer *entry;
@@ -117,6 +118,13 @@ int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
                         __ttm_bo_unreserve(bo);
 
                         ret = -EBUSY;
+
+                } else if (ret == -EALREADY && dups) {
+                        struct ttm_validate_buffer *safe = entry;
+                        entry = list_prev_entry(entry, head);
+                        list_del(&safe->head);
+                        list_add(&safe->head, dups);
+                        continue;
                 }
 
                 if (!ret) {
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 596cd6dafd33..33176d05db35 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -2487,7 +2487,8 @@ int vmw_execbuf_process(struct drm_file *file_priv,
         if (unlikely(ret != 0))
                 goto out_err_nores;
 
-        ret = ttm_eu_reserve_buffers(&ticket, &sw_context->validate_nodes, true);
+        ret = ttm_eu_reserve_buffers(&ticket, &sw_context->validate_nodes,
+                                     true, NULL);
         if (unlikely(ret != 0))
                 goto out_err;
 
@@ -2677,7 +2678,8 @@ void __vmw_execbuf_release_pinned_bo(struct vmw_private *dev_priv,
         query_val.shared = false;
         list_add_tail(&query_val.head, &validate_list);
 
-        ret = ttm_eu_reserve_buffers(&ticket, &validate_list, false);
+        ret = ttm_eu_reserve_buffers(&ticket, &validate_list,
+                                     false, NULL);
         if (unlikely(ret != 0)) {
                 vmw_execbuf_unpin_panic(dev_priv);
                 goto out_no_reserve;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 026de7cea0f6..210ef15b1d09 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -1222,7 +1222,7 @@ vmw_resource_check_buffer(struct vmw_resource *res,
         val_buf->bo = ttm_bo_reference(&res->backup->base);
         val_buf->shared = false;
         list_add_tail(&val_buf->head, &val_list);
-        ret = ttm_eu_reserve_buffers(NULL, &val_list, interruptible);
+        ret = ttm_eu_reserve_buffers(NULL, &val_list, interruptible, NULL);
         if (unlikely(ret != 0))
                 goto out_no_reserve;
 
diff --git a/include/drm/ttm/ttm_execbuf_util.h b/include/drm/ttm/ttm_execbuf_util.h
index 460441714413..b620c317c772 100644
--- a/include/drm/ttm/ttm_execbuf_util.h
+++ b/include/drm/ttm/ttm_execbuf_util.h
@@ -68,6 +68,7 @@ extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
  *           non-blocking reserves should be tried.
  * @list:    thread private list of ttm_validate_buffer structs.
  * @intr:    should the wait be interruptible
+ * @dups:    [out] optional list of duplicates.
  *
  * Tries to reserve bos pointed to by the list entries for validation.
  * If the function returns 0, all buffers are marked as "unfenced",
@@ -83,6 +84,11 @@ extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
  * calling process receives a signal while waiting. In that case, no
  * buffers on the list will be reserved upon return.
  *
+ * If dups is non NULL all buffers already reserved by the current thread
+ * (e.g. duplicates) are added to this list, otherwise -EALREADY is returned
+ * on the first already reserved buffer and all buffers from the list are
+ * unreserved again.
+ *
  * Buffers reserved by this function should be unreserved by
  * a call to either ttm_eu_backoff_reservation() or
  * ttm_eu_fence_buffer_objects() when command submission is complete or
@@ -90,7 +96,8 @@ extern void ttm_eu_backoff_reservation(struct ww_acquire_ctx *ticket,
  */
 
 extern int ttm_eu_reserve_buffers(struct ww_acquire_ctx *ticket,
-                                  struct list_head *list, bool intr);
+                                  struct list_head *list, bool intr,
+                                  struct list_head *dups);
 
 /**
  * function ttm_eu_fence_buffer_objects.