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Subject[PATCH v2 4/4] drm/virtio: Support virtgpu exported resources
Date
Add support for UUID-based resource sharing mechanism to virtgpu. This
implements the new virtgpu commands and hooks them up to dma-buf's
get_uuid callback.

Signed-off-by: David Stevens <stevensd@chromium.org>
---
drivers/gpu/drm/virtio/virtgpu_drv.c | 3 ++
drivers/gpu/drm/virtio/virtgpu_drv.h | 19 ++++++++
drivers/gpu/drm/virtio/virtgpu_kms.c | 4 ++
drivers/gpu/drm/virtio/virtgpu_prime.c | 48 ++++++++++++++++++--
drivers/gpu/drm/virtio/virtgpu_vq.c | 62 ++++++++++++++++++++++++++
5 files changed, 133 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
index ab4bed78e656..776e6667042e 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
@@ -165,6 +165,7 @@ static unsigned int features[] = {
VIRTIO_GPU_F_VIRGL,
#endif
VIRTIO_GPU_F_EDID,
+ VIRTIO_GPU_F_RESOURCE_UUID,
};
static struct virtio_driver virtio_gpu_driver = {
.feature_table = features,
@@ -202,7 +203,9 @@ static struct drm_driver driver = {
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_mmap = drm_gem_prime_mmap,
+ .gem_prime_export = virtgpu_gem_prime_export,
.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
+ .gem_prime_get_uuid = virtgpu_gem_prime_get_uuid,

.gem_create_object = virtio_gpu_create_object,
.fops = &virtio_gpu_driver_fops,
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index af9403e1cf78..4be84de73d86 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -49,6 +49,11 @@
#define DRIVER_MINOR 1
#define DRIVER_PATCHLEVEL 0

+#define UUID_NOT_INITIALIZED 0
+#define UUID_INITIALIZING 1
+#define UUID_INITIALIZED 2
+#define UUID_INITIALIZATION_FAILED 3
+
struct virtio_gpu_object_params {
uint32_t format;
uint32_t width;
@@ -75,6 +80,9 @@ struct virtio_gpu_object {

bool dumb;
bool created;
+
+ int uuid_state;
+ uuid_t uuid;
};
#define gem_to_virtio_gpu_obj(gobj) \
container_of((gobj), struct virtio_gpu_object, base.base)
@@ -196,6 +204,7 @@ struct virtio_gpu_device {
bool has_virgl_3d;
bool has_edid;
bool has_indirect;
+ bool has_resource_assign_uuid;

struct work_struct config_changed_work;

@@ -206,6 +215,8 @@ struct virtio_gpu_device {
struct virtio_gpu_drv_capset *capsets;
uint32_t num_capsets;
struct list_head cap_cache;
+
+ spinlock_t resource_export_lock;
};

struct virtio_gpu_fpriv {
@@ -338,6 +349,10 @@ void virtio_gpu_dequeue_fence_func(struct work_struct *work);
void virtio_gpu_disable_notify(struct virtio_gpu_device *vgdev);
void virtio_gpu_enable_notify(struct virtio_gpu_device *vgdev);

+int
+virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object *bo);
+
/* virtio_gpu_display.c */
void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev);
void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev);
@@ -366,6 +381,10 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
struct virtio_gpu_object **bo_ptr,
struct virtio_gpu_fence *fence);
/* virtgpu_prime.c */
+struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
+ int flags);
+int virtgpu_gem_prime_get_uuid(struct drm_gem_object *obj,
+ uuid_t *uuid);
struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
struct drm_device *dev, struct dma_buf_attachment *attach,
struct sg_table *sgt);
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/virtgpu_kms.c
index 4009c2f97d08..5a2aeb6d2f35 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -134,6 +134,7 @@ int virtio_gpu_init(struct drm_device *dev)
vgdev->dev = dev->dev;

spin_lock_init(&vgdev->display_info_lock);
+ spin_lock_init(&vgdev->resource_export_lock);
ida_init(&vgdev->ctx_id_ida);
ida_init(&vgdev->resource_ida);
init_waitqueue_head(&vgdev->resp_wq);
@@ -162,6 +163,9 @@ int virtio_gpu_init(struct drm_device *dev)
if (virtio_has_feature(vgdev->vdev, VIRTIO_RING_F_INDIRECT_DESC)) {
vgdev->has_indirect = true;
}
+ if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_RESOURCE_UUID)) {
+ vgdev->has_resource_assign_uuid = true;
+ }

DRM_INFO("features: %cvirgl %cedid\n",
vgdev->has_virgl_3d ? '+' : '-',
diff --git a/drivers/gpu/drm/virtio/virtgpu_prime.c b/drivers/gpu/drm/virtio/virtgpu_prime.c
index 050d24c39a8f..12ceda34b4f9 100644
--- a/drivers/gpu/drm/virtio/virtgpu_prime.c
+++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
@@ -26,9 +26,51 @@

#include "virtgpu_drv.h"

-/* Empty Implementations as there should not be any other driver for a virtual
- * device that might share buffers with virtgpu
- */
+int virtgpu_gem_prime_get_uuid(struct drm_gem_object *obj,
+ uuid_t *uuid)
+{
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ struct virtio_gpu_device *vgdev = obj->dev->dev_private;
+
+ // The state should have changed when the buffer was exported.
+ WARN_ON(bo->uuid_state == UUID_NOT_INITIALIZED);
+
+ wait_event(vgdev->resp_wq, bo->uuid_state != UUID_INITIALIZING);
+ if (bo->uuid_state != UUID_INITIALIZED)
+ return -ENODEV;
+
+ uuid_copy(uuid, &bo->uuid);
+
+ return 0;
+}
+
+struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
+ int flags)
+{
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ struct virtio_gpu_device *vgdev = obj->dev->dev_private;
+ bool needs_init = false;
+ int ret = 0;
+
+ if (vgdev->has_resource_assign_uuid) {
+ spin_lock(&vgdev->resource_export_lock);
+ if (bo->uuid_state == UUID_NOT_INITIALIZED) {
+ bo->uuid_state = UUID_INITIALIZING;
+ needs_init = true;
+ }
+ spin_unlock(&vgdev->resource_export_lock);
+
+ if (needs_init) {
+ ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, bo);
+ if (ret)
+ return ERR_PTR(ret);
+ }
+ } else {
+ bo->uuid_state = UUID_INITIALIZATION_FAILED;
+ }
+
+ return drm_gem_prime_export(obj, flags);
+}

struct drm_gem_object *virtgpu_gem_prime_import_sg_table(
struct drm_device *dev, struct dma_buf_attachment *attach,
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c
index cfe9c54f87a3..e692098fc573 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -1111,3 +1111,65 @@ void virtio_gpu_cursor_ping(struct virtio_gpu_device *vgdev,
memcpy(cur_p, &output->cursor, sizeof(output->cursor));
virtio_gpu_queue_cursor(vgdev, vbuf);
}
+
+static void virtio_gpu_cmd_resource_uuid_cb(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_vbuffer *vbuf)
+{
+ struct virtio_gpu_resp_resource_uuid *resp =
+ (struct virtio_gpu_resp_resource_uuid *)vbuf->resp_buf;
+ struct virtio_gpu_object *obj =
+ (struct virtio_gpu_object *)vbuf->data_buf;
+ uint32_t resp_type = le32_to_cpu(resp->hdr.type);
+
+ /*
+ * Keeps the data_buf, which points to this virtio_gpu_object, from
+ * getting kfree'd after this cb returns.
+ */
+ vbuf->data_buf = NULL;
+
+ spin_lock(&vgdev->resource_export_lock);
+ WARN_ON(obj->uuid_state != UUID_INITIALIZING);
+
+ if (resp_type == VIRTIO_GPU_RESP_OK_RESOURCE_UUID &&
+ obj->uuid_state == UUID_INITIALIZING) {
+ memcpy(&obj->uuid.b, resp->uuid, sizeof(obj->uuid.b));
+ obj->uuid_state = UUID_INITIALIZED;
+ } else {
+ obj->uuid_state = UUID_INITIALIZATION_FAILED;
+ }
+ spin_unlock(&vgdev->resource_export_lock);
+
+ drm_gem_object_put_unlocked(&obj->base.base);
+ wake_up_all(&vgdev->resp_wq);
+}
+
+int
+virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object *bo)
+{
+ struct virtio_gpu_resource_assign_uuid *cmd_p;
+ struct virtio_gpu_vbuffer *vbuf;
+ struct virtio_gpu_resp_resource_uuid *resp_buf;
+
+ resp_buf = kzalloc(sizeof(*resp_buf), GFP_KERNEL);
+ if (!resp_buf) {
+ spin_lock(&vgdev->resource_export_lock);
+ bo->uuid_state = UUID_INITIALIZATION_FAILED;
+ spin_unlock(&vgdev->resource_export_lock);
+ return -ENOMEM;
+ }
+
+ cmd_p = virtio_gpu_alloc_cmd_resp(vgdev,
+ virtio_gpu_cmd_resource_uuid_cb, &vbuf, sizeof(*cmd_p),
+ sizeof(struct virtio_gpu_resp_resource_uuid), resp_buf);
+ memset(cmd_p, 0, sizeof(*cmd_p));
+
+ cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID);
+ cmd_p->resource_id = cpu_to_le32(bo->hw_res_handle);
+
+ /* Reuse the data_buf pointer for the object pointer. */
+ vbuf->data_buf = bo;
+ drm_gem_object_get(&bo->base.base);
+ virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+ return 0;
+}
--
2.25.0.265.gbab2e86ba0-goog
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