This patchset implements the current proposal for virtio cross-device
resource sharing [1]. It will be used to import virtio resources into
the virtio-video driver currently under discussion [2]. The patch
under consideration to add support in the virtio-video driver is [3].
It uses the APIs from v3 of this series, but the changes to update it
are relatively minor.
This patchset adds a new flavor of dma-bufs that supports querying the
underlying virtio object UUID, as well as adding support for exporting
resources from virtgpu.
[1] https://markmail.org/thread/2ypjt5cfeu3m6lxu
[2] https://markmail.org/thread/p5d3k566srtdtute
[3] https://markmail.org/thread/j4xlqaaim266qpks
v5 -> v6 changes:
- Fix >80 character comment
David Stevens (3):
virtio: add dma-buf support for exported objects
virtio-gpu: add VIRTIO_GPU_F_RESOURCE_UUID feature
drm/virtio: Support virtgpu exported resources
drivers/gpu/drm/virtio/virtgpu_drv.c | 3 +
drivers/gpu/drm/virtio/virtgpu_drv.h | 20 ++++++
drivers/gpu/drm/virtio/virtgpu_kms.c | 4 ++
drivers/gpu/drm/virtio/virtgpu_prime.c | 96 +++++++++++++++++++++++++-
drivers/gpu/drm/virtio/virtgpu_vq.c | 55 +++++++++++++++
drivers/virtio/Makefile | 2 +-
drivers/virtio/virtio.c | 6 ++
drivers/virtio/virtio_dma_buf.c | 82 ++++++++++++++++++++++
include/linux/virtio.h | 1 +
include/linux/virtio_dma_buf.h | 37 ++++++++++
include/uapi/linux/virtio_gpu.h | 19 +++++
11 files changed, 321 insertions(+), 4 deletions(-)
create mode 100644 drivers/virtio/virtio_dma_buf.c
create mode 100644 include/linux/virtio_dma_buf.h
--
2.28.0.220.ged08abb693-goog
This feature allows the guest to request a UUID from the host for a
particular virtio_gpu resource. The UUID can then be shared with other
virtio devices, to allow the other host devices to access the
virtio_gpu's corresponding host resource.
Signed-off-by: David Stevens <[email protected]>
---
include/uapi/linux/virtio_gpu.h | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gpu.h
index 0c85914d9369..9721d58b4d58 100644
--- a/include/uapi/linux/virtio_gpu.h
+++ b/include/uapi/linux/virtio_gpu.h
@@ -50,6 +50,10 @@
* VIRTIO_GPU_CMD_GET_EDID
*/
#define VIRTIO_GPU_F_EDID 1
+/*
+ * VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID
+ */
+#define VIRTIO_GPU_F_RESOURCE_UUID 2
enum virtio_gpu_ctrl_type {
VIRTIO_GPU_UNDEFINED = 0,
@@ -66,6 +70,7 @@ enum virtio_gpu_ctrl_type {
VIRTIO_GPU_CMD_GET_CAPSET_INFO,
VIRTIO_GPU_CMD_GET_CAPSET,
VIRTIO_GPU_CMD_GET_EDID,
+ VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID,
/* 3d commands */
VIRTIO_GPU_CMD_CTX_CREATE = 0x0200,
@@ -87,6 +92,7 @@ enum virtio_gpu_ctrl_type {
VIRTIO_GPU_RESP_OK_CAPSET_INFO,
VIRTIO_GPU_RESP_OK_CAPSET,
VIRTIO_GPU_RESP_OK_EDID,
+ VIRTIO_GPU_RESP_OK_RESOURCE_UUID,
/* error responses */
VIRTIO_GPU_RESP_ERR_UNSPEC = 0x1200,
@@ -340,4 +346,17 @@ enum virtio_gpu_formats {
VIRTIO_GPU_FORMAT_R8G8B8X8_UNORM = 134,
};
+/* VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID */
+struct virtio_gpu_resource_assign_uuid {
+ struct virtio_gpu_ctrl_hdr hdr;
+ __le32 resource_id;
+ __le32 padding;
+};
+
+/* VIRTIO_GPU_RESP_OK_RESOURCE_UUID */
+struct virtio_gpu_resp_resource_uuid {
+ struct virtio_gpu_ctrl_hdr hdr;
+ __u8 uuid[16];
+};
+
#endif
--
2.28.0.220.ged08abb693-goog
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 <[email protected]>
---
drivers/gpu/drm/virtio/virtgpu_drv.c | 3 +
drivers/gpu/drm/virtio/virtgpu_drv.h | 20 ++++++
drivers/gpu/drm/virtio/virtgpu_kms.c | 4 ++
drivers/gpu/drm/virtio/virtgpu_prime.c | 96 +++++++++++++++++++++++++-
drivers/gpu/drm/virtio/virtgpu_vq.c | 55 +++++++++++++++
5 files changed, 175 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
index ab4bed78e656..b039f493bda9 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,
@@ -202,6 +203,8 @@ 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 = virtgpu_gem_prime_import,
.gem_prime_import_sg_table = virtgpu_gem_prime_import_sg_table,
.gem_create_object = virtio_gpu_create_object,
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 49bebdee6d91..39dc907aa805 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -49,6 +49,10 @@
#define DRIVER_MINOR 1
#define DRIVER_PATCHLEVEL 0
+#define UUID_INITIALIZING 0
+#define UUID_INITIALIZED 1
+#define UUID_INITIALIZATION_FAILED 2
+
struct virtio_gpu_object_params {
uint32_t format;
uint32_t width;
@@ -71,6 +75,9 @@ struct virtio_gpu_object {
uint32_t hw_res_handle;
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)
@@ -200,6 +207,7 @@ 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;
@@ -210,6 +218,8 @@ 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 {
@@ -335,6 +345,10 @@ void virtio_gpu_dequeue_fence_func(struct work_struct *work);
void virtio_gpu_notify(struct virtio_gpu_device *vgdev);
+int
+virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object_array *objs);
+
/* virtgpu_display.c */
void virtio_gpu_modeset_init(struct virtio_gpu_device *vgdev);
void virtio_gpu_modeset_fini(struct virtio_gpu_device *vgdev);
@@ -366,6 +380,12 @@ int virtio_gpu_object_create(struct virtio_gpu_device *vgdev,
bool virtio_gpu_is_shmem(struct virtio_gpu_object *bo);
/* virtgpu_prime.c */
+struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
+ int flags);
+struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *buf);
+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 023a030ca7b9..7bcd0c75effa 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -125,6 +125,7 @@ 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);
@@ -153,6 +154,9 @@ 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..acd14ef73d56 100644
--- a/drivers/gpu/drm/virtio/virtgpu_prime.c
+++ b/drivers/gpu/drm/virtio/virtgpu_prime.c
@@ -23,12 +23,102 @@
*/
#include <drm/drm_prime.h>
+#include <linux/virtio_dma_buf.h>
#include "virtgpu_drv.h"
-/* Empty Implementations as there should not be any other driver for a virtual
- * device that might share buffers with virtgpu
- */
+static int virtgpu_virtio_get_uuid(struct dma_buf *buf,
+ uuid_t *uuid)
+{
+ struct drm_gem_object *obj = buf->priv;
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ struct virtio_gpu_device *vgdev = obj->dev->dev_private;
+
+ 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;
+}
+
+const struct virtio_dma_buf_ops virtgpu_dmabuf_ops = {
+ .ops = {
+ .cache_sgt_mapping = true,
+ .attach = virtio_dma_buf_attach,
+ .detach = drm_gem_map_detach,
+ .map_dma_buf = drm_gem_map_dma_buf,
+ .unmap_dma_buf = drm_gem_unmap_dma_buf,
+ .release = drm_gem_dmabuf_release,
+ .mmap = drm_gem_dmabuf_mmap,
+ .vmap = drm_gem_dmabuf_vmap,
+ .vunmap = drm_gem_dmabuf_vunmap,
+ },
+ .device_attach = drm_gem_map_attach,
+ .get_uuid = virtgpu_virtio_get_uuid,
+};
+
+struct dma_buf *virtgpu_gem_prime_export(struct drm_gem_object *obj,
+ int flags)
+{
+ struct dma_buf *buf;
+ struct drm_device *dev = obj->dev;
+ struct virtio_gpu_device *vgdev = dev->dev_private;
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(obj);
+ struct virtio_gpu_object_array *objs;
+ int ret = 0;
+ DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
+
+ if (vgdev->has_resource_assign_uuid) {
+ objs = virtio_gpu_array_alloc(1);
+ if (!objs)
+ return ERR_PTR(-ENOMEM);
+ virtio_gpu_array_add_obj(objs, &bo->base.base);
+
+ ret = virtio_gpu_cmd_resource_assign_uuid(vgdev, objs);
+ if (ret)
+ return ERR_PTR(ret);
+ virtio_gpu_notify(vgdev);
+ } else {
+ bo->uuid_state = UUID_INITIALIZATION_FAILED;
+ }
+
+ exp_info.ops = &virtgpu_dmabuf_ops.ops;
+ exp_info.size = obj->size;
+ exp_info.flags = flags;
+ exp_info.priv = obj;
+ exp_info.resv = obj->resv;
+
+ buf = virtio_dma_buf_export(&exp_info);
+ if (IS_ERR(buf))
+ return buf;
+
+ drm_dev_get(dev);
+ drm_gem_object_get(obj);
+
+ return buf;
+}
+
+struct drm_gem_object *virtgpu_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *buf)
+{
+ struct drm_gem_object *obj;
+
+ if (buf->ops == &virtgpu_dmabuf_ops.ops) {
+ obj = buf->priv;
+ if (obj->dev == dev) {
+ /*
+ * Importing dmabuf exported from our own gem increases
+ * refcount on gem itself instead of f_count of dmabuf.
+ */
+ drm_gem_object_get(obj);
+ return obj;
+ }
+ }
+
+ return drm_gem_prime_import(dev, buf);
+}
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 9e663a5d9952..55af6fc7bc7c 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -1107,3 +1107,58 @@ 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_object *obj =
+ gem_to_virtio_gpu_obj(vbuf->objs->objs[0]);
+ struct virtio_gpu_resp_resource_uuid *resp =
+ (struct virtio_gpu_resp_resource_uuid *)vbuf->resp_buf;
+ uint32_t resp_type = le32_to_cpu(resp->hdr.type);
+
+ 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);
+
+ wake_up_all(&vgdev->resp_wq);
+}
+
+int
+virtio_gpu_cmd_resource_assign_uuid(struct virtio_gpu_device *vgdev,
+ struct virtio_gpu_object_array *objs)
+{
+ struct virtio_gpu_object *bo = gem_to_virtio_gpu_obj(objs->objs[0]);
+ 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);
+ virtio_gpu_array_put_free(objs);
+ 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);
+
+ vbuf->objs = objs;
+ virtio_gpu_queue_ctrl_buffer(vgdev, vbuf);
+ return 0;
+}
--
2.28.0.220.ged08abb693-goog
This change adds a new flavor of dma-bufs that can be used by virtio
drivers to share exported objects. A virtio dma-buf can be queried by
virtio drivers to obtain the UUID which identifies the underlying
exported object.
Signed-off-by: David Stevens <[email protected]>
---
drivers/virtio/Makefile | 2 +-
drivers/virtio/virtio.c | 6 +++
drivers/virtio/virtio_dma_buf.c | 82 +++++++++++++++++++++++++++++++++
include/linux/virtio.h | 1 +
include/linux/virtio_dma_buf.h | 37 +++++++++++++++
5 files changed, 127 insertions(+), 1 deletion(-)
create mode 100644 drivers/virtio/virtio_dma_buf.c
create mode 100644 include/linux/virtio_dma_buf.h
diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile
index 29a1386ecc03..ecdae5b596de 100644
--- a/drivers/virtio/Makefile
+++ b/drivers/virtio/Makefile
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o
+obj-$(CONFIG_VIRTIO) += virtio.o virtio_ring.o virtio_dma_buf.o
obj-$(CONFIG_VIRTIO_MMIO) += virtio_mmio.o
obj-$(CONFIG_VIRTIO_PCI) += virtio_pci.o
virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index a977e32a88f2..5d46f0ded92d 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -357,6 +357,12 @@ int register_virtio_device(struct virtio_device *dev)
}
EXPORT_SYMBOL_GPL(register_virtio_device);
+bool is_virtio_device(struct device *dev)
+{
+ return dev->bus == &virtio_bus;
+}
+EXPORT_SYMBOL_GPL(is_virtio_device);
+
void unregister_virtio_device(struct virtio_device *dev)
{
int index = dev->index; /* save for after device release */
diff --git a/drivers/virtio/virtio_dma_buf.c b/drivers/virtio/virtio_dma_buf.c
new file mode 100644
index 000000000000..63e6b1908397
--- /dev/null
+++ b/drivers/virtio/virtio_dma_buf.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * dma-bufs for virtio exported objects
+ *
+ * Copyright (C) 2020 Google, Inc.
+ */
+
+#include <linux/virtio_dma_buf.h>
+
+/**
+ * virtio_dma_buf_export - Creates a new dma-buf for a virtio exported object
+ * @exp_info: [in] see dma_buf_export(). ops MUST refer to a dma_buf_ops
+ * struct embedded in a virtio_dma_buf_ops.
+ *
+ * This wraps dma_buf_export() to allow virtio drivers to create a dma-buf
+ * for an virtio exported object that can be queried by other virtio drivers
+ * for the object's UUID.
+ */
+struct dma_buf *virtio_dma_buf_export(
+ const struct dma_buf_export_info *exp_info)
+{
+ const struct virtio_dma_buf_ops *virtio_ops = container_of(
+ exp_info->ops, const struct virtio_dma_buf_ops, ops);
+
+ if (!exp_info->ops
+ || exp_info->ops->attach != &virtio_dma_buf_attach
+ || !virtio_ops->get_uuid) {
+ return ERR_PTR(-EINVAL);
+ }
+
+ return dma_buf_export(exp_info);
+}
+EXPORT_SYMBOL(virtio_dma_buf_export);
+
+/**
+ * virtio_dma_buf_attach - mandatory attach callback for virtio dma-bufs
+ */
+int virtio_dma_buf_attach(struct dma_buf *dma_buf,
+ struct dma_buf_attachment *attach)
+{
+ int ret;
+ const struct virtio_dma_buf_ops *ops = container_of(
+ dma_buf->ops, const struct virtio_dma_buf_ops, ops);
+
+ if (ops->device_attach) {
+ ret = ops->device_attach(dma_buf, attach);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(virtio_dma_buf_attach);
+
+/**
+ * is_virtio_dma_buf - returns true if the given dma-buf is a virtio dma-buf
+ * @dma_buf: buffer to query
+ */
+bool is_virtio_dma_buf(struct dma_buf *dma_buf)
+{
+ return dma_buf->ops->attach == &virtio_dma_buf_attach;
+}
+EXPORT_SYMBOL(is_virtio_dma_buf);
+
+/**
+ * virtio_dma_buf_get_uuid - gets a virtio dma-buf's exported object's uuid
+ * @dma_buf: [in] buffer to query
+ * @uuid: [out] the uuid
+ *
+ * Returns: 0 on success, negative on failure.
+ */
+int virtio_dma_buf_get_uuid(struct dma_buf *dma_buf,
+ uuid_t *uuid)
+{
+ const struct virtio_dma_buf_ops *ops = container_of(
+ dma_buf->ops, const struct virtio_dma_buf_ops, ops);
+
+ if (!is_virtio_dma_buf(dma_buf))
+ return -EINVAL;
+
+ return ops->get_uuid(dma_buf, uuid);
+}
+EXPORT_SYMBOL(virtio_dma_buf_get_uuid);
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 15f906e4a748..9397e25616c4 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -128,6 +128,7 @@ static inline struct virtio_device *dev_to_virtio(struct device *_dev)
void virtio_add_status(struct virtio_device *dev, unsigned int status);
int register_virtio_device(struct virtio_device *dev);
void unregister_virtio_device(struct virtio_device *dev);
+bool is_virtio_device(struct device *dev);
void virtio_break_device(struct virtio_device *dev);
diff --git a/include/linux/virtio_dma_buf.h b/include/linux/virtio_dma_buf.h
new file mode 100644
index 000000000000..394bf04362d7
--- /dev/null
+++ b/include/linux/virtio_dma_buf.h
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * dma-bufs for virtio exported objects
+ *
+ * Copyright (C) 2020 Google, Inc.
+ */
+
+#ifndef _LINUX_VIRTIO_DMA_BUF_H
+#define _LINUX_VIRTIO_DMA_BUF_H
+
+#include <linux/dma-buf.h>
+#include <linux/uuid.h>
+#include <linux/virtio.h>
+
+/**
+ * struct virtio_dma_buf_ops - operations possible on exported object dma-buf
+ * @ops: the base dma_buf_ops. ops.attach MUST be virtio_dma_buf_attach.
+ * @device_attach: [optional] callback invoked by virtio_dma_buf_attach during
+ * all attach operations.
+ * @get_uid: [required] callback to get the uuid of the exported object.
+ */
+struct virtio_dma_buf_ops {
+ struct dma_buf_ops ops;
+ int (*device_attach)(struct dma_buf *dma_buf,
+ struct dma_buf_attachment *attach);
+ int (*get_uuid)(struct dma_buf *dma_buf, uuid_t *uuid);
+};
+
+int virtio_dma_buf_attach(struct dma_buf *dma_buf,
+ struct dma_buf_attachment *attach);
+
+struct dma_buf *virtio_dma_buf_export(
+ const struct dma_buf_export_info *exp_info);
+bool is_virtio_dma_buf(struct dma_buf *dma_buf);
+int virtio_dma_buf_get_uuid(struct dma_buf *dma_buf, uuid_t *uuid);
+
+#endif /* _LINUX_VIRTIO_DMA_BUF_H */
--
2.28.0.220.ged08abb693-goog
On Tue, Aug 18, 2020 at 10:37:41AM +0900, David Stevens wrote:
> This patchset implements the current proposal for virtio cross-device
> resource sharing [1]. It will be used to import virtio resources into
> the virtio-video driver currently under discussion [2]. The patch
> under consideration to add support in the virtio-video driver is [3].
> It uses the APIs from v3 of this series, but the changes to update it
> are relatively minor.
>
> This patchset adds a new flavor of dma-bufs that supports querying the
> underlying virtio object UUID, as well as adding support for exporting
> resources from virtgpu.
>
> [1] https://markmail.org/thread/2ypjt5cfeu3m6lxu
> [2] https://markmail.org/thread/p5d3k566srtdtute
> [3] https://markmail.org/thread/j4xlqaaim266qpks
>
> v5 -> v6 changes:
> - Fix >80 character comment
Hmm, checkpatch still complains, full log below.
IIRC "dim checkpatch" runs scripts/checkpatch.pl with --strict
so it is a bit more picky ...
The FILE_PATH_CHANGES isn't a problem given that the new file
is covered by existing wildcard.
take care,
Gerd
---------------------------------------------------------------
+ dim checkpatch drm-misc-next..drm-qemu-next drm-misc
ee194dc222ae virtio: add dma-buf support for exported objects
-:29: WARNING:FILE_PATH_CHANGES: added, moved or deleted file(s), does MAINTAINERS need updating?
#29:
new file mode 100644
-:65: CHECK:OPEN_ENDED_LINE: Lines should not end with a '('
#65: FILE: include/linux/virtio_dma_buf.h:32:
+struct dma_buf *virtio_dma_buf_export(
-:112: CHECK:OPEN_ENDED_LINE: Lines should not end with a '('
#112: FILE: drivers/virtio/virtio_dma_buf.c:19:
+struct dma_buf *virtio_dma_buf_export(
-:115: CHECK:OPEN_ENDED_LINE: Lines should not end with a '('
#115: FILE: drivers/virtio/virtio_dma_buf.c:22:
+ const struct virtio_dma_buf_ops *virtio_ops = container_of(
-:119: CHECK:LOGICAL_CONTINUATIONS: Logical continuations should be on the previous line
#119: FILE: drivers/virtio/virtio_dma_buf.c:26:
+ if (!exp_info->ops
+ || exp_info->ops->attach != &virtio_dma_buf_attach
-:120: CHECK:LOGICAL_CONTINUATIONS: Logical continuations should be on the previous line
#120: FILE: drivers/virtio/virtio_dma_buf.c:27:
+ || exp_info->ops->attach != &virtio_dma_buf_attach
+ || !virtio_ops->get_uuid) {
-:135: CHECK:OPEN_ENDED_LINE: Lines should not end with a '('
#135: FILE: drivers/virtio/virtio_dma_buf.c:42:
+ const struct virtio_dma_buf_ops *ops = container_of(
-:167: CHECK:OPEN_ENDED_LINE: Lines should not end with a '('
#167: FILE: drivers/virtio/virtio_dma_buf.c:74:
+ const struct virtio_dma_buf_ops *ops = container_of(
total: 0 errors, 1 warnings, 7 checks, 144 lines checked
76c9c2abbe6b virtio-gpu: add VIRTIO_GPU_F_RESOURCE_UUID feature
9c3f3edd1cc4 (HEAD -> drm-qemu-next, kraxel.org/drm-qemu-next) drm/virtio: Support virtgpu exported resources
-:53: CHECK:UNCOMMENTED_DEFINITION: spinlock_t definition without comment
#53: FILE: drivers/gpu/drm/virtio/virtgpu_drv.h:222:
+ spinlock_t resource_export_lock;
-:250: CHECK:PREFER_KERNEL_TYPES: Prefer kernel type 'u32' over 'uint32_t'
#250: FILE: drivers/gpu/drm/virtio/virtgpu_vq.c:1118:
+ uint32_t resp_type = le32_to_cpu(resp->hdr.type);
-:256: CHECK:PARENTHESIS_ALIGNMENT: Alignment should match open parenthesis
#256: FILE: drivers/gpu/drm/virtio/virtgpu_vq.c:1124:
+ if (resp_type == VIRTIO_GPU_RESP_OK_RESOURCE_UUID &&
+ obj->uuid_state == UUID_INITIALIZING) {
-:286: CHECK:PARENTHESIS_ALIGNMENT: Alignment should match open parenthesis
#286: FILE: drivers/gpu/drm/virtio/virtgpu_vq.c:1154:
+ cmd_p = virtio_gpu_alloc_cmd_resp(vgdev,
+ virtio_gpu_cmd_resource_uuid_cb, &vbuf, sizeof(*cmd_p),
total: 0 errors, 0 warnings, 4 checks, 250 lines checked
+ exit 1
> Hmm, checkpatch still complains, full log below.
>
> IIRC "dim checkpatch" runs scripts/checkpatch.pl with --strict
> so it is a bit more picky ...
Ah, I didn't know --strict was being used. I'll send an update
momentarily. Sorry for the churn.
> -:250: CHECK:PREFER_KERNEL_TYPES: Prefer kernel type 'u32' over 'uint32_t'
> #250: FILE: drivers/gpu/drm/virtio/virtgpu_vq.c:1118:
> + uint32_t resp_type = le32_to_cpu(resp->hdr.type);
>
For consistency with the rest of the virtgpu code, I'll leave uint32_t.
Cheers,
David