[2/5,v5] drm/virtio: factor out context create hyercall

Commit Message

Gurchetan Singh Feb. 19, 2020, 5:56 p.m. UTC

We currently create an OpenGL context when opening the DRM fd
if 3D is available.

We may need other context types (VK,..) in the future, and the plan
is to have explicit initialization for that.

For explicit initialization to work, we need to factor out
virtio_gpu_create_context from driver initialization.

v2: Move context handle initialization too (@olv)

Signed-off-by: Gurchetan Singh <[e-mail]>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h   |  2 ++
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 17 +++++++++++++++++
 drivers/gpu/drm/virtio/virtgpu_kms.c   | 26 ++++++--------------------
 3 files changed, 25 insertions(+), 20 deletions(-)

Comments

Emil Velikov Feb. 19, 2020, 6:10 p.m. UTC | #1

Hi Gurchetan,

s/hyercall/hypercall/ in the commit message

On Wed, 19 Feb 2020 at 17:56, Gurchetan Singh
<[e-mail]> wrote:

> +void virtio_gpu_create_context(struct drm_device *dev,
> +                              struct drm_file *file)
> +{
> +       struct virtio_gpu_device *vgdev = dev->dev_private;
> +       struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
> +       char dbgname[TASK_COMM_LEN];
> +
> +       /* can't create contexts without 3d renderer */
> +       if (!vgdev->has_virgl_3d)
> +               return;
> +
This cannot trigger, since we have similar check in the caller
virtio_gpu_driver_open().


> @@ -260,8 +247,7 @@ int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
>  {
>         struct virtio_gpu_device *vgdev = dev->dev_private;
>         struct virtio_gpu_fpriv *vfpriv;
> -       int id;
> -       char dbgname[TASK_COMM_LEN];
> +       int handle;
>
>         /* can't create contexts without 3d renderer */
>         if (!vgdev->has_virgl_3d)
... namely this here.

With either of the two dropped:
Reviewed-by: Emil Velikov <[e-mail]>

-Emil

Patch

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 2f6c4ccbfd14..72c1d9b59dfe 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -214,6 +214,8 @@  struct virtio_gpu_fpriv {
 /* virtio_ioctl.c */
 #define DRM_VIRTIO_NUM_IOCTLS 10
 extern struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS];
+void virtio_gpu_create_context(struct drm_device *dev,
+			       struct drm_file *file);
 
 /* virtio_kms.c */
 int virtio_gpu_init(struct drm_device *dev);
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index baad7e1c9505..de04f80f737d 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -33,6 +33,23 @@ 
 
 #include "virtgpu_drv.h"
 
+void virtio_gpu_create_context(struct drm_device *dev,
+			       struct drm_file *file)
+{
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
+	char dbgname[TASK_COMM_LEN];
+
+	/* can't create contexts without 3d renderer */
+	if (!vgdev->has_virgl_3d)
+		return;
+
+	get_task_comm(dbgname, current);
+	virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
+				      strlen(dbgname), dbgname);
+	virtio_gpu_notify(vgdev);
+}
+
 static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
 				struct drm_file *file)
 {
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index ad3b673f5796..f7e3712502ca 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -52,19 +52,6 @@  static void virtio_gpu_config_changed_work_func(struct work_struct *work)
 		      events_clear, &events_clear);
 }
 
-static int virtio_gpu_context_create(struct virtio_gpu_device *vgdev,
-				      uint32_t nlen, const char *name)
-{
-	int handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
-
-	if (handle < 0)
-		return handle;
-	handle += 1;
-	virtio_gpu_cmd_context_create(vgdev, handle, nlen, name);
-	virtio_gpu_notify(vgdev);
-	return handle;
-}
-
 static void virtio_gpu_context_destroy(struct virtio_gpu_device *vgdev,
 				      uint32_t ctx_id)
 {
@@ -260,8 +247,7 @@  int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct virtio_gpu_fpriv *vfpriv;
-	int id;
-	char dbgname[TASK_COMM_LEN];
+	int handle;
 
 	/* can't create contexts without 3d renderer */
 	if (!vgdev->has_virgl_3d)
@@ -272,15 +258,15 @@  int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 	if (!vfpriv)
 		return -ENOMEM;
 
-	get_task_comm(dbgname, current);
-	id = virtio_gpu_context_create(vgdev, strlen(dbgname), dbgname);
-	if (id < 0) {
+	handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
+	if (handle < 0) {
 		kfree(vfpriv);
-		return id;
+		return handle;
 	}
 
-	vfpriv->ctx_id = id;
+	vfpriv->ctx_id = handle + 1;
 	file->driver_priv = vfpriv;
+	virtio_gpu_create_context(dev, file);
 	return 0;
 }