From: Gurchetan Singh <gurchetansingh@chromium.org> To: dri-devel@lists.freedesktop.org, virtio-dev@lists.oasis-open.org Cc: sebastien.boeuf@intel.com, kraxel@redhat.com, vgoyal@redhat.com, mst@redhat.com Subject: [PATCH 02/24] virtio: add dma-buf support for exported objects Date: Thu, 13 Aug 2020 19:39:38 -0700 [thread overview] Message-ID: <20200814024000.2485-3-gurchetansingh@chromium.org> (raw) In-Reply-To: <20200814024000.2485-1-gurchetansingh@chromium.org> From: David Stevens <stevensd@chromium.org> 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 <stevensd@chromium.org> --- 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 4d993791f2d7..49da768ee7fd 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..fa0d3a668f53 --- /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 the uuid of the virtio dma-buf's exported object + * @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 a493eac08393..55ea329fe72a 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -127,6 +127,7 @@ 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 */ -- 2.24.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
WARNING: multiple messages have this Message-ID (diff)
From: Gurchetan Singh <gurchetansingh@chromium.org> To: dri-devel@lists.freedesktop.org, virtio-dev@lists.oasis-open.org Cc: kraxel@redhat.com, mst@redhat.com, vgoyal@redhat.com, sebastien.boeuf@intel.com Subject: [virtio-dev] [PATCH 02/24] virtio: add dma-buf support for exported objects Date: Thu, 13 Aug 2020 19:39:38 -0700 [thread overview] Message-ID: <20200814024000.2485-3-gurchetansingh@chromium.org> (raw) In-Reply-To: <20200814024000.2485-1-gurchetansingh@chromium.org> From: David Stevens <stevensd@chromium.org> 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 <stevensd@chromium.org> --- 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 4d993791f2d7..49da768ee7fd 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..fa0d3a668f53 --- /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 the uuid of the virtio dma-buf's exported object + * @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 a493eac08393..55ea329fe72a 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -127,6 +127,7 @@ 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 */ -- 2.24.1 --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org
next prev parent reply other threads:[~2020-08-14 2:40 UTC|newest] Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-14 2:39 [PATCH 00/24] Blob prerequisites + blob resources Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 01/24] drm/virtio: Revert "drm/virtio: Call the right shmem helpers" Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` Gurchetan Singh [this message] 2020-08-14 2:39 ` [virtio-dev] [PATCH 02/24] virtio: add dma-buf support for exported objects Gurchetan Singh 2020-08-14 2:39 ` [PATCH 03/24] virtio-gpu: add VIRTIO_GPU_F_RESOURCE_UUID feature Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 04/24] drm/virtio: Support virtgpu exported resources Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 05/24] virtio: Add get_shm_region method Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 06/24] virtio: Implement get_shm_region for PCI transport Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 07/24] virtio: Implement get_shm_region for MMIO transport Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 08/24] drm/virtio: blob prep: refactor getting pages and attaching backing Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 09/24] drm/virtio: blob prep: make CPU responses more generic Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 10/24] virtio-gpu api: blob resources Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 11/24] virtio-gpu api: host visible feature Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 12/24] virtio-gpu api: cross-device feature Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 13/24] drm/virtio: implement blob resources: probe for the feature Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 14/24] drm/virtio: implement blob resources: probe for host visible region Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-16 13:10 ` kernel test robot 2020-08-16 13:10 ` kernel test robot 2020-08-14 2:39 ` [PATCH 15/24] drm/virtio: implement blob resources: expose virtio_gpu_resource_id_get Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 16/24] drm/virtio: implement blob resources: add new fields to internal structs Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 17/24] drm/virtio: implement blob resources: implement vram object Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 5:39 ` kernel test robot 2020-08-14 5:39 ` kernel test robot 2020-08-14 2:39 ` [PATCH 18/24] drm/virtio: implement blob resources: hypercall interface Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 6:12 ` kernel test robot 2020-08-14 6:12 ` kernel test robot 2020-08-14 2:39 ` [PATCH 19/24] drm/virtio: implement blob resources: blob display integration Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 20/24] drm/virtio: implement blob resources: refactor UUID code somewhat Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 21/24] drm/virtio: implement blob resources: fix stride discrepancy Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 22/24] drm/virtio: implement blob resources: report blob mem to userspace Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-14 2:39 ` [PATCH 23/24] drm/virtio: implement blob resources: resource create blob ioctl Gurchetan Singh 2020-08-14 2:39 ` [virtio-dev] " Gurchetan Singh 2020-08-17 17:46 ` Anthoine Bourgeois 2020-08-14 2:40 ` [PATCH 24/24] drm/virtio: advertise features to userspace Gurchetan Singh 2020-08-14 2:40 ` [virtio-dev] " Gurchetan Singh
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