[PATCH 1/5 v5] drm/virtio: use consistent names for drm_files

[PATCH 1/5 v5] drm/virtio: use consistent names for drm_files

[Gurchetan Singh]

Minor cleanup, change:

- file_priv--> file,
- drm_file --> file.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index bbc31aef51f1..baad7e1c9505 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -34,12 +34,12 @@
 #include "virtgpu_drv.h"
 
 static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
-				struct drm_file *file_priv)
+				struct drm_file *file)
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct drm_virtgpu_map *virtio_gpu_map = data;
 
-	return virtio_gpu_mode_dumb_mmap(file_priv, vgdev->ddev,
+	return virtio_gpu_mode_dumb_mmap(file, vgdev->ddev,
 					 virtio_gpu_map->handle,
 					 &virtio_gpu_map->offset);
 }
@@ -51,11 +51,11 @@ static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
  * VIRTIO_GPUReleaseInfo struct (first XXX bytes)
  */
 static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
-				 struct drm_file *drm_file)
+				 struct drm_file *file)
 {
 	struct drm_virtgpu_execbuffer *exbuf = data;
 	struct virtio_gpu_device *vgdev = dev->dev_private;
-	struct virtio_gpu_fpriv *vfpriv = drm_file->driver_priv;
+	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
 	struct virtio_gpu_fence *out_fence;
 	int ret;
 	uint32_t *bo_handles = NULL;
@@ -116,7 +116,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 			goto out_unused_fd;
 		}
 
-		buflist = virtio_gpu_array_from_handles(drm_file, bo_handles,
+		buflist = virtio_gpu_array_from_handles(file, bo_handles,
 							exbuf->num_bo_handles);
 		if (!buflist) {
 			ret = -ENOENT;
@@ -178,7 +178,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 }
 
 static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data,
-				     struct drm_file *file_priv)
+				     struct drm_file *file)
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct drm_virtgpu_getparam *param = data;
@@ -201,7 +201,7 @@ static int virtio_gpu_getparam_ioctl(struct drm_device *dev, void *data,
 }
 
 static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
-					    struct drm_file *file_priv)
+					    struct drm_file *file)
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct drm_virtgpu_resource_create *rc = data;
@@ -252,7 +252,7 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
 		return ret;
 	obj = &qobj->base.base;
 
-	ret = drm_gem_handle_create(file_priv, obj, &handle);
+	ret = drm_gem_handle_create(file, obj, &handle);
 	if (ret) {
 		drm_gem_object_release(obj);
 		return ret;
@@ -265,13 +265,13 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
 }
 
 static int virtio_gpu_resource_info_ioctl(struct drm_device *dev, void *data,
-					  struct drm_file *file_priv)
+					  struct drm_file *file)
 {
 	struct drm_virtgpu_resource_info *ri = data;
 	struct drm_gem_object *gobj = NULL;
 	struct virtio_gpu_object *qobj = NULL;
 
-	gobj = drm_gem_object_lookup(file_priv, ri->bo_handle);
+	gobj = drm_gem_object_lookup(file, ri->bo_handle);
 	if (gobj == NULL)
 		return -ENOENT;
 
-- 
2.25.0.265.gbab2e86ba0-goog

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

[Gurchetan Singh]

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 <gurchetansingh@chromium.org>
---
 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(-)

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;
 }
 
-- 
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[PATCH 3/5 v5] drm/virtio: track whether or not a context has been initiated

[Gurchetan Singh]

Use an atomic variable to track whether a context has been
initiated.

v5: Fix possible race and sleep via mutex (@olv)

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h   | 2 ++
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 8 ++++++++
 drivers/gpu/drm/virtio/virtgpu_kms.c   | 3 +++
 3 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 72c1d9b59dfe..0596d9618554 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -209,6 +209,8 @@ struct virtio_gpu_device {
 
 struct virtio_gpu_fpriv {
 	uint32_t ctx_id;
+	bool context_initiated;
+	struct mutex context_lock;
 };
 
 /* virtio_ioctl.c */
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index de04f80f737d..c1a6cb4ec375 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -44,10 +44,18 @@ void virtio_gpu_create_context(struct drm_device *dev,
 	if (!vgdev->has_virgl_3d)
 		return;
 
+	mutex_lock(&vfpriv->context_lock);
+	if (vfpriv->context_initiated)
+		goto out_unlock;
+
 	get_task_comm(dbgname, current);
 	virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
 				      strlen(dbgname), dbgname);
 	virtio_gpu_notify(vgdev);
+	vfpriv->context_initiated = true;
+
+out_unlock:
+	mutex_unlock(&vfpriv->context_lock);
 }
 
 static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index f7e3712502ca..424729cb81d1 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -258,6 +258,8 @@ int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 	if (!vfpriv)
 		return -ENOMEM;
 
+	mutex_init(&vfpriv->context_lock);
+
 	handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
 	if (handle < 0) {
 		kfree(vfpriv);
@@ -281,6 +283,7 @@ void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
 	vfpriv = file->driver_priv;
 
 	virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
+	mutex_destroy(&vfpriv->context_lock);
 	kfree(vfpriv);
 	file->driver_priv = NULL;
 }
-- 
2.25.0.265.gbab2e86ba0-goog

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[PATCH 4/5 v5] drm/virtio: enqueue virtio_gpu_create_context after the first 3D ioctl

[Gurchetan Singh]

For old userspace, initialization will still be implicit.

For backwards compatibility, enqueue virtio_gpu_cmd_context_create after
the first 3D ioctl.

v3: staticify virtio_gpu_create_context
    remove notify to batch vm-exit

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
---
 drivers/gpu/drm/virtio/virtgpu_drv.h   |  2 --
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 10 +++++++---
 drivers/gpu/drm/virtio/virtgpu_kms.c   |  1 -
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 0596d9618554..9fdc3b4cef48 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -216,8 +216,6 @@ 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 c1a6cb4ec375..2c182922ec78 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -33,8 +33,8 @@
 
 #include "virtgpu_drv.h"
 
-void virtio_gpu_create_context(struct drm_device *dev,
-			       struct drm_file *file)
+static 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;
@@ -51,7 +51,6 @@ void virtio_gpu_create_context(struct drm_device *dev,
 	get_task_comm(dbgname, current);
 	virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
 				      strlen(dbgname), dbgname);
-	virtio_gpu_notify(vgdev);
 	vfpriv->context_initiated = true;
 
 out_unlock:
@@ -99,6 +98,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 
 	exbuf->fence_fd = -1;
 
+	virtio_gpu_create_context(dev, file);
 	if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_IN) {
 		struct dma_fence *in_fence;
 
@@ -250,6 +250,7 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
 			return -EINVAL;
 	}
 
+	virtio_gpu_create_context(dev, file);
 	params.format = rc->format;
 	params.width = rc->width;
 	params.height = rc->height;
@@ -323,6 +324,7 @@ static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
 	if (vgdev->has_virgl_3d == false)
 		return -ENOSYS;
 
+	virtio_gpu_create_context(dev, file);
 	objs = virtio_gpu_array_from_handles(file, &args->bo_handle, 1);
 	if (objs == NULL)
 		return -ENOENT;
@@ -371,6 +373,7 @@ static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
 			 args->box.w, args->box.h, args->box.x, args->box.y,
 			 objs, NULL);
 	} else {
+		virtio_gpu_create_context(dev, file);
 		ret = virtio_gpu_array_lock_resv(objs);
 		if (ret != 0)
 			goto err_put_free;
@@ -471,6 +474,7 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 	spin_unlock(&vgdev->display_info_lock);
 
 	/* not in cache - need to talk to hw */
+	virtio_gpu_create_context(dev, file);
 	virtio_gpu_cmd_get_capset(vgdev, found_valid, args->cap_set_ver,
 				  &cache_ent);
 	virtio_gpu_notify(vgdev);
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 424729cb81d1..023a030ca7b9 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -268,7 +268,6 @@ int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
 
 	vfpriv->ctx_id = handle + 1;
 	file->driver_priv = vfpriv;
-	virtio_gpu_create_context(dev, file);
 	return 0;
 }
 
-- 
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[PATCH 5/5 v5] drm/virtio: add virtio_gpu_context_type

[Gurchetan Singh]

We'll have to do something like this eventually, and this
conveys we want a Virgl context by default.

Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
---
 drivers/gpu/drm/virtio/virtgpu_ioctl.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 2c182922ec78..c3358eedd3ab 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -33,8 +33,14 @@
 
 #include "virtgpu_drv.h"
 
+/* TODO: add more context types */
+enum virtio_gpu_context_type {
+	virtio_gpu_virgl_context,
+};
+
 static void virtio_gpu_create_context(struct drm_device *dev,
-				      struct drm_file *file)
+				      struct drm_file *file,
+				      enum virtio_gpu_context_type type)
 {
 	struct virtio_gpu_device *vgdev = dev->dev_private;
 	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
@@ -44,6 +50,11 @@ static void virtio_gpu_create_context(struct drm_device *dev,
 	if (!vgdev->has_virgl_3d)
 		return;
 
+	if (type != virtio_gpu_virgl_context) {
+		DRM_ERROR("Unsupported context type: %u\n", type);
+		return;
+	}
+
 	mutex_lock(&vfpriv->context_lock);
 	if (vfpriv->context_initiated)
 		goto out_unlock;
@@ -98,7 +109,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 
 	exbuf->fence_fd = -1;
 
-	virtio_gpu_create_context(dev, file);
+	virtio_gpu_create_context(dev, file, virtio_gpu_virgl_context);
 	if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_IN) {
 		struct dma_fence *in_fence;
 
@@ -250,7 +261,7 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
 			return -EINVAL;
 	}
 
-	virtio_gpu_create_context(dev, file);
+	virtio_gpu_create_context(dev, file, virtio_gpu_virgl_context);
 	params.format = rc->format;
 	params.width = rc->width;
 	params.height = rc->height;
@@ -324,7 +335,7 @@ static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
 	if (vgdev->has_virgl_3d == false)
 		return -ENOSYS;
 
-	virtio_gpu_create_context(dev, file);
+	virtio_gpu_create_context(dev, file, virtio_gpu_virgl_context);
 	objs = virtio_gpu_array_from_handles(file, &args->bo_handle, 1);
 	if (objs == NULL)
 		return -ENOENT;
@@ -373,7 +384,7 @@ static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
 			 args->box.w, args->box.h, args->box.x, args->box.y,
 			 objs, NULL);
 	} else {
-		virtio_gpu_create_context(dev, file);
+		virtio_gpu_create_context(dev, file, virtio_gpu_virgl_context);
 		ret = virtio_gpu_array_lock_resv(objs);
 		if (ret != 0)
 			goto err_put_free;
@@ -474,7 +485,7 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 	spin_unlock(&vgdev->display_info_lock);
 
 	/* not in cache - need to talk to hw */
-	virtio_gpu_create_context(dev, file);
+	virtio_gpu_create_context(dev, file, virtio_gpu_virgl_context);
 	virtio_gpu_cmd_get_capset(vgdev, found_valid, args->cap_set_ver,
 				  &cache_ent);
 	virtio_gpu_notify(vgdev);
-- 
2.25.0.265.gbab2e86ba0-goog

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Re: [PATCH 1/5 v5] drm/virtio: use consistent names for drm_files

[Emil Velikov]

On Wed, 19 Feb 2020 at 17:56, Gurchetan Singh
<gurchetansingh@chromium.org> wrote:
>
> Minor cleanup, change:
>
> - file_priv--> file,
> - drm_file --> file.
>
> Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

-Emil
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Re: [PATCH 2/5 v5] drm/virtio: factor out context create hyercall

[Emil Velikov]

Hi Gurchetan,

s/hyercall/hypercall/ in the commit message

On Wed, 19 Feb 2020 at 17:56, Gurchetan Singh
<gurchetansingh@chromium.org> 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 <emil.velikov@collabora.com>

-Emil
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Re: [PATCH 3/5 v5] drm/virtio: track whether or not a context has been initiated

[Emil Velikov]

On Wed, 19 Feb 2020 at 17:56, Gurchetan Singh
<gurchetansingh@chromium.org> wrote:
>
> Use an atomic variable to track whether a context has been
> initiated.
>
> v5: Fix possible race and sleep via mutex (@olv)
>
> Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

-Emil
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Re: [PATCH 4/5 v5] drm/virtio: enqueue virtio_gpu_create_context after the first 3D ioctl

[Emil Velikov]

On Wed, 19 Feb 2020 at 17:57, Gurchetan Singh
<gurchetansingh@chromium.org> wrote:
>
> For old userspace, initialization will still be implicit.
>
> For backwards compatibility, enqueue virtio_gpu_cmd_context_create after
> the first 3D ioctl.
>
> v3: staticify virtio_gpu_create_context
>     remove notify to batch vm-exit
>
Similar to 2/5 I suspect we have nested has_virgl_3d checking.

> Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
> ---
>  drivers/gpu/drm/virtio/virtgpu_drv.h   |  2 --
>  drivers/gpu/drm/virtio/virtgpu_ioctl.c | 10 +++++++---
>  drivers/gpu/drm/virtio/virtgpu_kms.c   |  1 -
>  3 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
> index 0596d9618554..9fdc3b4cef48 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> @@ -216,8 +216,6 @@ 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 c1a6cb4ec375..2c182922ec78 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -33,8 +33,8 @@
>
>  #include "virtgpu_drv.h"
>
> -void virtio_gpu_create_context(struct drm_device *dev,
> -                              struct drm_file *file)
> +static void virtio_gpu_create_context(struct drm_device *dev,
> +                                     struct drm_file *file)
>  {
In this function...

>         struct virtio_gpu_device *vgdev = dev->dev_private;
>         struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
> @@ -51,7 +51,6 @@ void virtio_gpu_create_context(struct drm_device *dev,
>         get_task_comm(dbgname, current);
>         virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
>                                       strlen(dbgname), dbgname);
> -       virtio_gpu_notify(vgdev);
>         vfpriv->context_initiated = true;
>
>  out_unlock:
> @@ -99,6 +98,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
>
... and this caller, just a couple of lines above.

>         exbuf->fence_fd = -1;
>
> +       virtio_gpu_create_context(dev, file);
>         if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_IN) {
>                 struct dma_fence *in_fence;
>
> @@ -250,6 +250,7 @@ static int virtio_gpu_resource_create_ioctl(struct drm_device *dev, void *data,
>                         return -EINVAL;
>         }
>
Unrelated: might be a good idea to sort the has_virgl_3d == false
EINVAL handling like the has_virgl_3d == true hunk just below. Bonus
points for a comment explaining we don't check for the bind and flags
arguments.

> +       virtio_gpu_create_context(dev, file);
>         params.format = rc->format;
>         params.width = rc->width;
>         params.height = rc->height;
> @@ -323,6 +324,7 @@ static int virtio_gpu_transfer_from_host_ioctl(struct drm_device *dev,
>         if (vgdev->has_virgl_3d == false)
>                 return -ENOSYS;
>
... and this caller.

> +       virtio_gpu_create_context(dev, file);
>         objs = virtio_gpu_array_from_handles(file, &args->bo_handle, 1);
>         if (objs == NULL)
>                 return -ENOENT;
> @@ -371,6 +373,7 @@ static int virtio_gpu_transfer_to_host_ioctl(struct drm_device *dev, void *data,
>                          args->box.w, args->box.h, args->box.x, args->box.y,
>                          objs, NULL);
>         } else {
... and this caller, just a couple of lines above.

With the trivial comments addressed:
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

-Emil
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Re: [PATCH 5/5 v5] drm/virtio: add virtio_gpu_context_type

[Emil Velikov]

On Wed, 19 Feb 2020 at 17:57, Gurchetan Singh
<gurchetansingh@chromium.org> wrote:
>
> We'll have to do something like this eventually, and this
> conveys we want a Virgl context by default.
>
> Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

HTH
Emil
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Re: [PATCH 3/5 v5] drm/virtio: track whether or not a context has been initiated

[Chia-I Wu]

Patch 1-4 are

Reviewed-by: Chia-I Wu <olvaffe@gmail.com>

I think we can drop patch 5 for now.


On Wed, Feb 19, 2020 at 9:56 AM Gurchetan Singh
<gurchetansingh@chromium.org> wrote:
>
> Use an atomic variable to track whether a context has been
> initiated.
>
> v5: Fix possible race and sleep via mutex (@olv)
>
> Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
> ---
>  drivers/gpu/drm/virtio/virtgpu_drv.h   | 2 ++
>  drivers/gpu/drm/virtio/virtgpu_ioctl.c | 8 ++++++++
>  drivers/gpu/drm/virtio/virtgpu_kms.c   | 3 +++
>  3 files changed, 13 insertions(+)
>
> diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
> index 72c1d9b59dfe..0596d9618554 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_drv.h
> +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
> @@ -209,6 +209,8 @@ struct virtio_gpu_device {
>
>  struct virtio_gpu_fpriv {
>         uint32_t ctx_id;
> +       bool context_initiated;
ctx_id and context_initialized are named hw_res_handle and created
respectively in virtio_gpu_object.  I think we should use "hw",
"id"/"handle", "initialized"/"created" more consistently.

This is just a nitpick, and does not need to be a part of this series.

> +       struct mutex context_lock;
>  };
>
>  /* virtio_ioctl.c */
> diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> index de04f80f737d..c1a6cb4ec375 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
> @@ -44,10 +44,18 @@ void virtio_gpu_create_context(struct drm_device *dev,
>         if (!vgdev->has_virgl_3d)
>                 return;
>
> +       mutex_lock(&vfpriv->context_lock);
> +       if (vfpriv->context_initiated)
> +               goto out_unlock;
> +
>         get_task_comm(dbgname, current);
>         virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
>                                       strlen(dbgname), dbgname);
>         virtio_gpu_notify(vgdev);
> +       vfpriv->context_initiated = true;
> +
> +out_unlock:
> +       mutex_unlock(&vfpriv->context_lock);
>  }
>
>  static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,
> diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
> index f7e3712502ca..424729cb81d1 100644
> --- a/drivers/gpu/drm/virtio/virtgpu_kms.c
> +++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
> @@ -258,6 +258,8 @@ int virtio_gpu_driver_open(struct drm_device *dev, struct drm_file *file)
>         if (!vfpriv)
>                 return -ENOMEM;
>
> +       mutex_init(&vfpriv->context_lock);
> +
>         handle = ida_alloc(&vgdev->ctx_id_ida, GFP_KERNEL);
>         if (handle < 0) {
>                 kfree(vfpriv);
> @@ -281,6 +283,7 @@ void virtio_gpu_driver_postclose(struct drm_device *dev, struct drm_file *file)
>         vfpriv = file->driver_priv;
>
>         virtio_gpu_context_destroy(vgdev, vfpriv->ctx_id);
> +       mutex_destroy(&vfpriv->context_lock);
>         kfree(vfpriv);
>         file->driver_priv = NULL;
>  }
> --
> 2.25.0.265.gbab2e86ba0-goog
>
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