[PATCH v3 05/12] drm/virtio: implement context init: support init ioctl
Gurchetan Singh
gurchetansingh at chromium.org
Tue Sep 21 23:20:17 UTC 2021
From: Anthoine Bourgeois <anthoine.bourgeois at gmail.com>
This implements the context initialization ioctl. A list of params
is passed in by userspace, and kernel driver validates them. The
only currently supported param is VIRTGPU_CONTEXT_PARAM_CAPSET_ID.
If the context has already been initialized, -EEXIST is returned.
This happens after Linux userspace does dumb_create + followed by
opening the Mesa virgl driver with the same virtgpu instance.
However, for most applications, 3D contexts will be explicitly
initialized when the feature is available.
Signed-off-by: Anthoine Bourgeois <anthoine.bourgeois at gmail.com>
Acked-by: Lingfeng Yang <lfy at google.com>
---
drivers/gpu/drm/virtio/virtgpu_drv.h | 6 +-
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 96 ++++++++++++++++++++++++--
drivers/gpu/drm/virtio/virtgpu_vq.c | 4 +-
3 files changed, 98 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 5e1958a522ff..9996abf60e3a 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -259,12 +259,13 @@ struct virtio_gpu_device {
struct virtio_gpu_fpriv {
uint32_t ctx_id;
+ uint32_t context_init;
bool context_created;
struct mutex context_lock;
};
/* virtgpu_ioctl.c */
-#define DRM_VIRTIO_NUM_IOCTLS 11
+#define DRM_VIRTIO_NUM_IOCTLS 12
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);
@@ -342,7 +343,8 @@ int virtio_gpu_cmd_get_capset(struct virtio_gpu_device *vgdev,
struct virtio_gpu_drv_cap_cache **cache_p);
int virtio_gpu_cmd_get_edids(struct virtio_gpu_device *vgdev);
void virtio_gpu_cmd_context_create(struct virtio_gpu_device *vgdev, uint32_t id,
- uint32_t nlen, const char *name);
+ uint32_t context_init, uint32_t nlen,
+ const char *name);
void virtio_gpu_cmd_context_destroy(struct virtio_gpu_device *vgdev,
uint32_t id);
void virtio_gpu_cmd_context_attach_resource(struct virtio_gpu_device *vgdev,
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 5c1ad1596889..f5281d1e30e1 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -38,20 +38,30 @@
VIRTGPU_BLOB_FLAG_USE_SHAREABLE | \
VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)
+/* Must be called with &virtio_gpu_fpriv.struct_mutex held. */
+static void virtio_gpu_create_context_locked(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_fpriv *vfpriv)
+{
+ char dbgname[TASK_COMM_LEN];
+
+ get_task_comm(dbgname, current);
+ virtio_gpu_cmd_context_create(vgdev, vfpriv->ctx_id,
+ vfpriv->context_init, strlen(dbgname),
+ dbgname);
+
+ vfpriv->context_created = true;
+}
+
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];
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);
- vfpriv->context_created = true;
+ virtio_gpu_create_context_locked(vgdev, vfpriv);
out_unlock:
mutex_unlock(&vfpriv->context_lock);
@@ -662,6 +672,79 @@ static int virtio_gpu_resource_create_blob_ioctl(struct drm_device *dev,
return 0;
}
+static int virtio_gpu_context_init_ioctl(struct drm_device *dev,
+ void *data, struct drm_file *file)
+{
+ int ret = 0;
+ uint32_t num_params, i, param, value;
+ size_t len;
+ struct drm_virtgpu_context_set_param *ctx_set_params = NULL;
+ struct virtio_gpu_device *vgdev = dev->dev_private;
+ struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
+ struct drm_virtgpu_context_init *args = data;
+
+ num_params = args->num_params;
+ len = num_params * sizeof(struct drm_virtgpu_context_set_param);
+
+ if (!vgdev->has_context_init || !vgdev->has_virgl_3d)
+ return -EINVAL;
+
+ /* Number of unique parameters supported at this time. */
+ if (num_params > 1)
+ return -EINVAL;
+
+ ctx_set_params = memdup_user(u64_to_user_ptr(args->ctx_set_params),
+ len);
+
+ if (IS_ERR(ctx_set_params))
+ return PTR_ERR(ctx_set_params);
+
+ mutex_lock(&vfpriv->context_lock);
+ if (vfpriv->context_created) {
+ ret = -EEXIST;
+ goto out_unlock;
+ }
+
+ for (i = 0; i < num_params; i++) {
+ param = ctx_set_params[i].param;
+ value = ctx_set_params[i].value;
+
+ switch (param) {
+ case VIRTGPU_CONTEXT_PARAM_CAPSET_ID:
+ if (value > MAX_CAPSET_ID) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ if ((vgdev->capset_id_mask & (1 << value)) == 0) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ /* Context capset ID already set */
+ if (vfpriv->context_init &
+ VIRTIO_GPU_CONTEXT_INIT_CAPSET_ID_MASK) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ vfpriv->context_init |= value;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+ }
+
+ virtio_gpu_create_context_locked(vgdev, vfpriv);
+ virtio_gpu_notify(vgdev);
+
+out_unlock:
+ mutex_unlock(&vfpriv->context_lock);
+ kfree(ctx_set_params);
+ return ret;
+}
+
struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS] = {
DRM_IOCTL_DEF_DRV(VIRTGPU_MAP, virtio_gpu_map_ioctl,
DRM_RENDER_ALLOW),
@@ -698,4 +781,7 @@ struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS] = {
DRM_IOCTL_DEF_DRV(VIRTGPU_RESOURCE_CREATE_BLOB,
virtio_gpu_resource_create_blob_ioctl,
DRM_RENDER_ALLOW),
+
+ DRM_IOCTL_DEF_DRV(VIRTGPU_CONTEXT_INIT, virtio_gpu_context_init_ioctl,
+ DRM_RENDER_ALLOW),
};
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 93a41d018dca..db7741549ab0 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -911,7 +911,8 @@ int virtio_gpu_cmd_get_edids(struct virtio_gpu_device *vgdev)
}
void virtio_gpu_cmd_context_create(struct virtio_gpu_device *vgdev, uint32_t id,
- uint32_t nlen, const char *name)
+ uint32_t context_init, uint32_t nlen,
+ const char *name)
{
struct virtio_gpu_ctx_create *cmd_p;
struct virtio_gpu_vbuffer *vbuf;
@@ -922,6 +923,7 @@ void virtio_gpu_cmd_context_create(struct virtio_gpu_device *vgdev, uint32_t id,
cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_CTX_CREATE);
cmd_p->hdr.ctx_id = cpu_to_le32(id);
cmd_p->nlen = cpu_to_le32(nlen);
+ cmd_p->context_init = cpu_to_le32(context_init);
strncpy(cmd_p->debug_name, name, sizeof(cmd_p->debug_name) - 1);
cmd_p->debug_name[sizeof(cmd_p->debug_name) - 1] = 0;
virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
--
2.33.0.464.g1972c5931b-goog
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