Re: [PATCH 23/24] drm/virtio: implement blob resources: resource create blob ioctl

Anthoine Bourgeois <anthoine.bourgeois@xxxxxxxxx> · Mon, 17 Aug 2020 19:46:57 +0200

On Thu, Aug 13, 2020 at 07:39:59PM -0700, Gurchetan Singh wrote:
From: Gerd Hoffmann <kraxel@xxxxxxxxxx>

Implement resource create blob as specified.

Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Co-developed-by: Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>
Signed-off-by: Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>
Acked-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
---
drivers/gpu/drm/virtio/virtgpu_drv.h    |   4 +-
drivers/gpu/drm/virtio/virtgpu_ioctl.c  | 136 ++++++++++++++++++++++++
drivers/gpu/drm/virtio/virtgpu_object.c |   5 +-
drivers/gpu/drm/virtio/virtgpu_vram.c   |   2 +
4 files changed, 144 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 444b65c8d4ee..3e9ec5b1fb63 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -255,8 +255,8 @@ struct virtio_gpu_fpriv {
	struct mutex context_lock;
};

-/* virtgpu_ioctl.c */
-#define DRM_VIRTIO_NUM_IOCTLS 10
+/* virtio_ioctl.c */
+#define DRM_VIRTIO_NUM_IOCTLS 11
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);

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 7dbe24248a20..47ac32b7031a 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -34,6 +34,10 @@

#include "virtgpu_drv.h"

+#define VIRTGPU_BLOB_FLAG_USE_MASK (VIRTGPU_BLOB_FLAG_USE_MAPPABLE | \
+				    VIRTGPU_BLOB_FLAG_USE_SHAREABLE | \
+				    VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)
+
void virtio_gpu_create_context(struct drm_device *dev, struct drm_file *file)
{
	struct virtio_gpu_device *vgdev = dev->dev_private;
@@ -520,6 +524,134 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
	return 0;
}

+static int verify_blob(struct virtio_gpu_device *vgdev,
+		       struct virtio_gpu_fpriv *vfpriv,
+		       struct virtio_gpu_object_params *params,
+		       struct drm_virtgpu_resource_create_blob *rc_blob,
+		       bool *guest_blob, bool *host3d_blob)
+{
+	if (!vgdev->has_resource_blob)
+		return -EINVAL;
+
+	if ((rc_blob->blob_flags & ~VIRTGPU_BLOB_FLAG_USE_MASK) ||
+	    !rc_blob->blob_flags)
+		return -EINVAL;
+
+	if (rc_blob->blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE) {
+		if (!vgdev->has_resource_assign_uuid)
+			return -EINVAL;
+	}
+
+	switch (rc_blob->blob_mem) {
+	case VIRTGPU_BLOB_MEM_GUEST:
+		*guest_blob = true;
+		break;
+	case VIRTGPU_BLOB_MEM_HOST3D_GUEST:
+		*guest_blob = true;
+		fallthrough;
+	case VIRTGPU_BLOB_MEM_HOST3D:
+		*host3d_blob = true;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (*host3d_blob) {
+		if (!vgdev->has_virgl_3d)
+			return -EINVAL;
+
+		/* Must be dword aligned. */
+		if ((rc_blob->cmd_size) % 4 != 0)
+			return -EINVAL;
+
+		params->ctx_id = vfpriv->ctx_id;
+		params->blob_id = rc_blob->blob_id;
+	} else {
+		if (rc_blob->blob_id != 0)
+			return -EINVAL;
+
+		if (rc_blob->cmd_size != 0)
+			return -EINVAL;
+	}
+
+	params->blob_mem = rc_blob->blob_mem;
+	params->size = rc_blob->size;
+	params->blob = true;
+	params->blob_flags = rc_blob->blob_flags;
+	return 0;
+}
+
+static int virtio_gpu_resource_create_blob(struct drm_device *dev,
+					   void *data, struct drm_file *file)
+{
+	int ret = 0;
+	uint32_t handle = 0;
+	struct drm_gem_object *obj;
+	struct virtio_gpu_object *bo;
+	bool host3d_blob, guest_blob;
+	struct virtio_gpu_object_params params = { 0 };
+	struct virtio_gpu_device *vgdev = dev->dev_private;
+	struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
+	struct drm_virtgpu_resource_create_blob *rc_blob = data;
+
+	guest_blob = host3d_blob = false;
+	if (verify_blob(vgdev, vfpriv, &params, rc_blob,
+			&guest_blob, &host3d_blob))
+		return -EINVAL;
+
+	if (vgdev->has_virgl_3d)
+		virtio_gpu_create_context(dev, file);
+
+	if (rc_blob->cmd_size) {
+		void *buf;
+
+		buf = memdup_user(u64_to_user_ptr(rc_blob->cmd),
+				  rc_blob->cmd_size);
+
+		if (IS_ERR(buf))
+			return PTR_ERR(buf);
+
+		virtio_gpu_cmd_submit(vgdev, buf, rc_blob->cmd_size,
+				      vfpriv->ctx_id, NULL, NULL);
+	}
+
+	if (guest_blob)
+		ret = virtio_gpu_object_create(vgdev, &params, &bo, NULL);
+	else if (!guest_blob && host3d_blob)
+		ret = virtio_gpu_vram_create(vgdev, &params, &bo);
+	else
+		return -EINVAL;
+
+	if (ret < 0)
+		return ret;
+
+	bo->guest_blob = guest_blob;
+	bo->host3d_blob = host3d_blob;
+	bo->blob_mem = rc_blob->blob_mem;
+	bo->blob_flags = rc_blob->blob_flags;
+
+	obj = &bo->base.base;
+	if (params.blob_flags & VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE) {
+		ret = virtio_gpu_resource_assign_uuid(vgdev, bo);
+		if (ret) {
+			drm_gem_object_release(obj);
+			return ret;
+		}
+	}
+
+	ret = drm_gem_handle_create(file, obj, &handle);
+	if (ret) {
+		drm_gem_object_release(obj);
+		return ret;
+	}
+	drm_gem_object_put(obj);
+
+	rc_blob->res_handle = bo->hw_res_handle;
+	rc_blob->bo_handle = handle;
+
+	return 0;
+}
+
struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS] = {
	DRM_IOCTL_DEF_DRV(VIRTGPU_MAP, virtio_gpu_map_ioctl,
			  DRM_RENDER_ALLOW),
@@ -552,4 +684,8 @@ struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS] = {

	DRM_IOCTL_DEF_DRV(VIRTGPU_GET_CAPS, virtio_gpu_get_caps_ioctl,
			  DRM_RENDER_ALLOW),
+
+	DRM_IOCTL_DEF_DRV(VIRTGPU_RESOURCE_CREATE_BLOB,
+			  virtio_gpu_resource_create_blob,

Should the function be suffixed by _ioctl like the others?

Other than than, all the serie is:
Reviewed-by: Anthoine Bourgeois <anthoine.bourgeois@xxxxxxxxx>

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