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drm/virtio: track whether or not a context has been initiated

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

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

Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Gurchetan Singh <gurchetansingh@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200225000800.2966-3-gurchetansingh@chromium.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gurchetan Singh 2020-02-24 16:07:59 -08:00 committed by Gerd Hoffmann
parent 40cadedd20
commit d2a983b220
3 changed files with 13 additions and 0 deletions
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2
drivers/gpu/drm/virtio/virtgpu_drv.h
View File

@ -209,6 +209,8 @@ struct virtio_gpu_device {
struct virtio_gpu_fpriv {
uint32_t ctx_id;
bool context_created;
struct mutex context_lock;
};
/* virtio_ioctl.c */

8
drivers/gpu/drm/virtio/virtgpu_ioctl.c
View File

@ -40,10 +40,18 @@ void virtio_gpu_create_context(struct drm_device *dev,
struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
char dbgname[TASK_COMM_LEN];
mutex_lock(&vfpriv->context_lock);
if (vfpriv->context_created)
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_created = true;
out_unlock:
mutex_unlock(&vfpriv->context_lock);
}
static int virtio_gpu_map_ioctl(struct drm_device *dev, void *data,

3
drivers/gpu/drm/virtio/virtgpu_kms.c
View File

@ -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;
}