For screen targets it appears we need to pin surfaces while they are bound
as screen targets, so add a small interface to do that.
v2: Always increase pin_count on pin.
v3: Add missing reservation sem.
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Sinclair Yeh <syeh@xxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h | 4 ++
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 91 +++++++++++++++++++++++++++++++-
2 files changed, 94 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
index d26a6da..3da7249 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -113,6 +113,7 @@ struct vmw_resource {
bool backup_dirty; /* Protected by backup buffer reserved */
struct vmw_dma_buffer *backup;
unsigned long backup_offset;
+ unsigned long pin_count; /* Protected by resource reserved */
const struct vmw_res_func *func;
struct list_head lru_head; /* Protected by the resource lock */
struct list_head mob_head; /* Protected by @backup reserved */
@@ -927,6 +928,9 @@ int vmw_dumb_map_offset(struct drm_file *file_priv,
int vmw_dumb_destroy(struct drm_file *file_priv,
struct drm_device *dev,
uint32_t handle);
+extern int vmw_resource_pin(struct vmw_resource *res);
+extern void vmw_resource_unpin(struct vmw_resource *res);
+
/**
* Overlay control - vmwgfx_overlay.c
*/
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 210ef15..33b24b9 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -1183,7 +1183,7 @@ void vmw_resource_unreserve(struct vmw_resource *res,
if (new_backup)
res->backup_offset = new_backup_offset;
- if (!res->func->may_evict || res->id == -1)
+ if (!res->func->may_evict || res->id == -1 || res->pin_count)
return;
write_lock(&dev_priv->resource_lock);
@@ -1573,3 +1573,92 @@ void vmw_resource_evict_all(struct vmw_private *dev_priv)
mutex_unlock(&dev_priv->cmdbuf_mutex);
}
+
+/**
+ * vmw_resource_pin - Add a pin reference on a resource
+ *
+ * @res: The resource to add a pin reference on
+ *
+ * This function adds a pin reference, and if needed validates the resource.
+ * Having a pin reference means that the resource can never be evicted, and
+ * its id will never change as long as there is a pin reference.
+ * This function returns 0 on success and a negative error code on failure.
+ */
+int vmw_resource_pin(struct vmw_resource *res)
+{
+ struct vmw_private *dev_priv = res->dev_priv;
+ int ret;
+
+ ttm_write_lock(&dev_priv->reservation_sem, false);
+ mutex_lock(&dev_priv->cmdbuf_mutex);
+ ret = vmw_resource_reserve(res, false);
+ if (ret)
+ goto out_no_reserve;
+
+ if (res->pin_count == 0) {
+ struct ttm_buffer_object *bo = NULL;
+
+ if (res->backup) {
+ bo = &res->backup->base;
+
+ ttm_bo_reserve(bo, false, false, false, 0);
+ ret = ttm_bo_validate(bo, res->func->backup_placement,
+ false, false);
+ if (ret) {
+ ttm_bo_unreserve(bo);
+ goto out_no_validate;
+ }
+
+ /* Do we really need to pin the MOB as well? */
+ vmw_bo_pin(bo, true);
+ }
+ ret = vmw_resource_validate(res);
+ if (bo)
+ ttm_bo_unreserve(bo);
+ if (ret)
+ goto out_no_validate;
+ }
+ res->pin_count++;
+
+out_no_validate:
+ vmw_resource_unreserve(res, NULL, 0UL);
+out_no_reserve:
+ mutex_unlock(&dev_priv->cmdbuf_mutex);
+ ttm_write_unlock(&dev_priv->reservation_sem);
+
+ return ret;
+}
+
+/**
+ * vmw_resource_unpin - Remove a pin reference from a resource
+ *
+ * @res: The resource to remove a pin reference from
+ *
+ * Having a pin reference means that the resource can never be evicted, and
+ * its id will never change as long as there is a pin reference.
+ */
+void vmw_resource_unpin(struct vmw_resource *res)
+{
+ struct vmw_private *dev_priv = res->dev_priv;
+ int ret;
+
+ ttm_read_lock(&dev_priv->reservation_sem, false);
+ mutex_lock(&dev_priv->cmdbuf_mutex);
+
+ ret = vmw_resource_reserve(res, true);
+ WARN_ON(ret);
+
+ WARN_ON(res->pin_count == 0);
+ if (--res->pin_count == 0 && res->backup) {
+ struct ttm_buffer_object *bo = &res->backup->base;
+
+ ttm_bo_reserve(bo, false, false, false, 0);
+ vmw_bo_pin(bo, false);
+ ttm_bo_unreserve(bo);
+ }
+
+ vmw_resource_unreserve(res, NULL, 0UL);
+
+ mutex_unlock(&dev_priv->cmdbuf_mutex);
+ ttm_read_unlock(&dev_priv->reservation_sem);
+}
--
2.1.0
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