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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Sep 2025 14:19:47.4208 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a77a3c3a-c9e2-4f5e-421c-08ddfaac402d X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001C9.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB8842 Currently querying and setting capabilities is restricted to a single capability and contained within the virtio PCI driver. However, each device type has generic and device specific capabilities, that may be queried and set. In subsequent patches virtio_net will query and set flow filter capabilities. Move the admin related definitions to a new header file. It needs to be abstracted away from the PCI specifics to be used by upper layer drivers. Signed-off-by: Daniel Jurgens Reviewed-by: Parav Pandit Reviewed-by: Shahar Shitrit Reviewed-by: Yishai Hadas --- drivers/virtio/virtio.c | 82 ++++++++++++++++ drivers/virtio/virtio_pci_common.h | 1 - drivers/virtio/virtio_pci_modern.c | 145 +++++++++++++++++------------ include/linux/virtio.h | 14 +++ include/linux/virtio_admin.h | 68 ++++++++++++++ include/uapi/linux/virtio_pci.h | 7 +- 6 files changed, 255 insertions(+), 62 deletions(-) create mode 100644 include/linux/virtio_admin.h diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index a09eb4d62f82..6bc268c11100 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -706,6 +706,88 @@ int virtio_device_reset_done(struct virtio_device *dev) } EXPORT_SYMBOL_GPL(virtio_device_reset_done); +/** + * virtio_device_cap_id_list_query - Query the list of available capability IDs + * @vdev: the virtio device + * @data: pointer to store the capability ID list result + * + * This function queries the virtio device for the list of available capability + * IDs that can be used with virtio_device_cap_get() and virtio_device_cap_set(). + * The result is stored in the provided data structure. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability queries, or a negative error code on other failures. + */ +int +virtio_device_cap_id_list_query(struct virtio_device *vdev, + struct virtio_admin_cmd_query_cap_id_result *data) +{ + const struct virtio_admin_ops *admin = vdev->admin_ops; + + if (!admin || !admin->cap_id_list_query) + return -EOPNOTSUPP; + + return admin->cap_id_list_query(vdev, data); +} +EXPORT_SYMBOL_GPL(virtio_device_cap_id_list_query); + +/** + * virtio_device_cap_get - Get a capability from a virtio device + * @vdev: the virtio device + * @id: capability ID to retrieve + * @caps: buffer to store the capability data + * @cap_size: size of the capability buffer in bytes + * + * This function retrieves a specific capability from the virtio device. + * The capability data is stored in the provided buffer. The caller must + * ensure the buffer is large enough to hold the capability data. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability retrieval, or a negative error code on other failures. + */ +int virtio_device_cap_get(struct virtio_device *vdev, + u16 id, + void *caps, + size_t cap_size) +{ + const struct virtio_admin_ops *admin = vdev->admin_ops; + + if (!admin || !admin->cap_get) + return -EOPNOTSUPP; + + return admin->cap_get(vdev, id, caps, cap_size); +} +EXPORT_SYMBOL_GPL(virtio_device_cap_get); + +/** + * virtio_device_cap_set - Set a capability on a virtio device + * @vdev: the virtio device + * @id: capability ID to set + * @caps: buffer containing the capability data to set + * @cap_size: size of the capability data in bytes + * + * This function sets a specific capability on the virtio device. + * The capability data is read from the provided buffer and applied + * to the device. The device may validate the capability data before + * applying it. + * + * Return: 0 on success, -EOPNOTSUPP if the device doesn't support admin + * operations or capability setting, or a negative error code on other failures. + */ +int virtio_device_cap_set(struct virtio_device *vdev, + u16 id, + const void *caps, + size_t cap_size) +{ + const struct virtio_admin_ops *admin = vdev->admin_ops; + + if (!admin || !admin->cap_set) + return -EOPNOTSUPP; + + return admin->cap_set(vdev, id, caps, cap_size); +} +EXPORT_SYMBOL_GPL(virtio_device_cap_set); + static int virtio_init(void) { BUILD_BUG_ON(offsetof(struct virtio_device, features) != diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h index 8cd01de27baf..fc26e035e7a6 100644 --- a/drivers/virtio/virtio_pci_common.h +++ b/drivers/virtio/virtio_pci_common.h @@ -48,7 +48,6 @@ struct virtio_pci_admin_vq { /* Protects virtqueue access. */ spinlock_t lock; u64 supported_cmds; - u64 supported_caps; u8 max_dev_parts_objects; struct ida dev_parts_ida; /* Name of the admin queue: avq.$vq_index. */ diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index dd0e65f71d41..c8bbd807371d 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -19,6 +19,7 @@ #define VIRTIO_PCI_NO_LEGACY #define VIRTIO_RING_NO_LEGACY #include "virtio_pci_common.h" +#include #define VIRTIO_AVQ_SGS_MAX 4 @@ -232,103 +233,123 @@ static void virtio_pci_admin_cmd_list_init(struct virtio_device *virtio_dev) kfree(data); } -static void -virtio_pci_admin_cmd_dev_parts_objects_enable(struct virtio_device *virtio_dev) +static int vp_modern_admin_cmd_cap_get(struct virtio_device *virtio_dev, + u16 id, + void *caps, + size_t cap_size) { - struct virtio_pci_device *vp_dev = to_vp_device(virtio_dev); - struct virtio_admin_cmd_cap_get_data *get_data; - struct virtio_admin_cmd_cap_set_data *set_data; - struct virtio_dev_parts_cap *result; + struct virtio_admin_cmd_cap_get_data *data __free(kfree) = NULL; struct virtio_admin_cmd cmd = {}; struct scatterlist result_sg; struct scatterlist data_sg; - u8 resource_objects_limit; - u16 set_data_size; - int ret; - get_data = kzalloc(sizeof(*get_data), GFP_KERNEL); - if (!get_data) - return; - - result = kzalloc(sizeof(*result), GFP_KERNEL); - if (!result) - goto end; + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; - get_data->id = cpu_to_le16(VIRTIO_DEV_PARTS_CAP); - sg_init_one(&data_sg, get_data, sizeof(*get_data)); - sg_init_one(&result_sg, result, sizeof(*result)); + data->id = cpu_to_le16(id); + sg_init_one(&data_sg, data, sizeof(*data)); + sg_init_one(&result_sg, caps, cap_size); cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_DEVICE_CAP_GET); cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); cmd.data_sg = &data_sg; cmd.result_sg = &result_sg; - ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd); - if (ret) - goto err_get; - set_data_size = sizeof(*set_data) + sizeof(*result); - set_data = kzalloc(set_data_size, GFP_KERNEL); - if (!set_data) - goto err_get; + return vp_modern_admin_cmd_exec(virtio_dev, &cmd); +} - set_data->id = cpu_to_le16(VIRTIO_DEV_PARTS_CAP); +static int vp_modern_admin_cmd_cap_set(struct virtio_device *virtio_dev, + u16 id, + const void *caps, + size_t cap_size) +{ + struct virtio_admin_cmd_cap_set_data *data __free(kfree) = NULL; + struct virtio_admin_cmd cmd = {}; + struct scatterlist data_sg; + size_t data_size; + + data_size = sizeof(*data) + cap_size; + data = kzalloc(data_size, GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->id = cpu_to_le16(id); + memcpy(data->cap_specific_data, caps, cap_size); + sg_init_one(&data_sg, data, data_size); + cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_DRIVER_CAP_SET); + cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); + cmd.data_sg = &data_sg; + cmd.result_sg = NULL; + + return vp_modern_admin_cmd_exec(virtio_dev, &cmd); +} + +static void +virtio_pci_admin_cmd_dev_parts_objects_enable(struct virtio_device *virtio_dev) +{ + struct virtio_pci_device *vp_dev = to_vp_device(virtio_dev); + struct virtio_dev_parts_cap *dev_parts; + u8 resource_objects_limit; + int ret; + + dev_parts = kzalloc(sizeof(*dev_parts), GFP_KERNEL); + if (!dev_parts) + return; + + ret = vp_modern_admin_cmd_cap_get(virtio_dev, VIRTIO_DEV_PARTS_CAP, + dev_parts, sizeof(*dev_parts)); + if (ret) + goto err; /* Set the limit to the minimum value between the GET and SET values * supported by the device. Since the obj_id for VIRTIO_DEV_PARTS_CAP * is a globally unique value per PF, there is no possibility of * overlap between GET and SET operations. */ - resource_objects_limit = min(result->get_parts_resource_objects_limit, - result->set_parts_resource_objects_limit); - result->get_parts_resource_objects_limit = resource_objects_limit; - result->set_parts_resource_objects_limit = resource_objects_limit; - memcpy(set_data->cap_specific_data, result, sizeof(*result)); - sg_init_one(&data_sg, set_data, set_data_size); - cmd.data_sg = &data_sg; - cmd.result_sg = NULL; - cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_DRIVER_CAP_SET); - ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd); + resource_objects_limit = min(dev_parts->get_parts_resource_objects_limit, + dev_parts->set_parts_resource_objects_limit); + dev_parts->get_parts_resource_objects_limit = resource_objects_limit; + dev_parts->set_parts_resource_objects_limit = resource_objects_limit; + + ret = vp_modern_admin_cmd_cap_set(virtio_dev, VIRTIO_DEV_PARTS_CAP, + dev_parts, sizeof(*dev_parts)); if (ret) - goto err_set; + goto err; /* Allocate IDR to manage the dev caps objects */ ida_init(&vp_dev->admin_vq.dev_parts_ida); vp_dev->admin_vq.max_dev_parts_objects = resource_objects_limit; -err_set: - kfree(set_data); -err_get: - kfree(result); -end: - kfree(get_data); +err: + kfree(dev_parts); } -static void virtio_pci_admin_cmd_cap_init(struct virtio_device *virtio_dev) +static int vp_modern_admin_cap_id_list_query(struct virtio_device *virtio_dev, + struct virtio_admin_cmd_query_cap_id_result *data) { - struct virtio_pci_device *vp_dev = to_vp_device(virtio_dev); - struct virtio_admin_cmd_query_cap_id_result *data; struct virtio_admin_cmd cmd = {}; struct scatterlist result_sg; - int ret; - - data = kzalloc(sizeof(*data), GFP_KERNEL); - if (!data) - return; sg_init_one(&result_sg, data, sizeof(*data)); cmd.opcode = cpu_to_le16(VIRTIO_ADMIN_CMD_CAP_ID_LIST_QUERY); cmd.group_type = cpu_to_le16(VIRTIO_ADMIN_GROUP_TYPE_SELF); cmd.result_sg = &result_sg; - ret = vp_modern_admin_cmd_exec(virtio_dev, &cmd); - if (ret) - goto end; + return vp_modern_admin_cmd_exec(virtio_dev, &cmd); +} - /* Max number of caps fits into a single u64 */ - BUILD_BUG_ON(sizeof(data->supported_caps) > sizeof(u64)); +static void virtio_pci_admin_cmd_cap_init(struct virtio_device *virtio_dev) +{ + struct virtio_admin_cmd_query_cap_id_result *data; - vp_dev->admin_vq.supported_caps = le64_to_cpu(data->supported_caps[0]); + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return; + + if (vp_modern_admin_cap_id_list_query(virtio_dev, data)) + goto end; - if (!(vp_dev->admin_vq.supported_caps & (1 << VIRTIO_DEV_PARTS_CAP))) + if (!(VIRTIO_CAP_IN_LIST(data, VIRTIO_DEV_PARTS_CAP))) goto end; virtio_pci_admin_cmd_dev_parts_objects_enable(virtio_dev); @@ -1264,6 +1285,11 @@ static const struct virtio_config_ops virtio_pci_config_ops = { .enable_vq_after_reset = vp_modern_enable_vq_after_reset, }; +static const struct virtio_admin_ops virtio_pci_admin_ops = { + .cap_id_list_query = vp_modern_admin_cap_id_list_query, + .cap_get = vp_modern_admin_cmd_cap_get, + .cap_set = vp_modern_admin_cmd_cap_set, +}; /* the PCI probing function */ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) { @@ -1282,6 +1308,7 @@ int virtio_pci_modern_probe(struct virtio_pci_device *vp_dev) else vp_dev->vdev.config = &virtio_pci_config_nodev_ops; + vp_dev->vdev.admin_ops = &virtio_pci_admin_ops; vp_dev->config_vector = vp_config_vector; vp_dev->setup_vq = setup_vq; vp_dev->del_vq = del_vq; diff --git a/include/linux/virtio.h b/include/linux/virtio.h index db31fc6f4f1f..7ab4ea75ad44 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -12,6 +12,7 @@ #include #include #include +#include /** * struct virtqueue - a queue to register buffers for sending or receiving. @@ -141,6 +142,7 @@ struct virtio_admin_cmd { * @id: the device type identification (used to match it with a driver). * @config: the configuration ops for this device. * @vringh_config: configuration ops for host vrings. + * @admin_ops: administration operations for this device. * @vqs: the list of virtqueues for this device. * @features: the 64 lower features supported by both driver and device. * @features_array: the full features space supported by both driver and @@ -161,6 +163,7 @@ struct virtio_device { struct virtio_device_id id; const struct virtio_config_ops *config; const struct vringh_config_ops *vringh_config; + const struct virtio_admin_ops *admin_ops; struct list_head vqs; VIRTIO_DECLARE_FEATURES(features); void *priv; @@ -195,6 +198,17 @@ int virtio_device_restore(struct virtio_device *dev); void virtio_reset_device(struct virtio_device *dev); int virtio_device_reset_prepare(struct virtio_device *dev); int virtio_device_reset_done(struct virtio_device *dev); +int +virtio_device_cap_id_list_query(struct virtio_device *vdev, + struct virtio_admin_cmd_query_cap_id_result *data); +int virtio_device_cap_get(struct virtio_device *vdev, + u16 id, + void *caps, + size_t cap_size); +int virtio_device_cap_set(struct virtio_device *vdev, + u16 id, + const void *caps, + size_t cap_size); size_t virtio_max_dma_size(const struct virtio_device *vdev); diff --git a/include/linux/virtio_admin.h b/include/linux/virtio_admin.h new file mode 100644 index 000000000000..bbf543d20be4 --- /dev/null +++ b/include/linux/virtio_admin.h @@ -0,0 +1,68 @@ +/* SPDX-License-Identifier: GPL-2.0-only + * + * Header file for virtio admin operations + */ +#include + +#ifndef _LINUX_VIRTIO_ADMIN_H +#define _LINUX_VIRTIO_ADMIN_H + +struct virtio_device; + +/** + * VIRTIO_CAP_IN_LIST - Check if a capability is supported in the capability list + * @cap_list: Pointer to capability list structure containing supported_caps array + * @cap: Capability ID to check + * + * The cap_list contains a supported_caps array of little-endian 64-bit integers + * where each bit represents a capability. Bit 0 of the first element represents + * capability ID 0, bit 1 represents capability ID 1, and so on. + * + * Return: 1 if capability is supported, 0 otherwise + */ +#define VIRTIO_CAP_IN_LIST(cap_list, cap) \ + (!!(1 & (le64_to_cpu(cap_list->supported_caps[cap / 64]) >> cap % 64))) + +/** + * struct virtio_admin_ops - Operations for virtio admin functionality + * + * This structure contains function pointers for performing administrative + * operations on virtio devices. All data and caps pointers must be allocated + * on the heap by the caller. + */ +struct virtio_admin_ops { + /** + * @cap_id_list_query: Query the list of supported capability IDs + * @vdev: The virtio device to query + * @data: Pointer to result structure (must be heap allocated) + * Return: 0 on success, negative error code on failure + */ + int (*cap_id_list_query)(struct virtio_device *vdev, + struct virtio_admin_cmd_query_cap_id_result *data); + /** + * @cap_get: Get capability data for a specific capability ID + * @vdev: The virtio device + * @id: Capability ID to retrieve + * @caps: Pointer to capability data structure (must be heap allocated) + * @cap_size: Size of the capability data structure + * Return: 0 on success, negative error code on failure + */ + int (*cap_get)(struct virtio_device *vdev, + u16 id, + void *caps, + size_t cap_size); + /** + * @cap_set: Set capability data for a specific capability ID + * @vdev: The virtio device + * @id: Capability ID to set + * @caps: Pointer to capability data structure (must be heap allocated) + * @cap_size: Size of the capability data structure + * Return: 0 on success, negative error code on failure + */ + int (*cap_set)(struct virtio_device *vdev, + u16 id, + const void *caps, + size_t cap_size); +}; + +#endif /* _LINUX_VIRTIO_ADMIN_H */ diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h index c691ac210ce2..0d5ca0cff629 100644 --- a/include/uapi/linux/virtio_pci.h +++ b/include/uapi/linux/virtio_pci.h @@ -315,15 +315,18 @@ struct virtio_admin_cmd_notify_info_result { #define VIRTIO_DEV_PARTS_CAP 0x0000 +/* Update this value to largest implemented cap number. */ +#define VIRTIO_ADMIN_MAX_CAP 0x0fff + struct virtio_dev_parts_cap { __u8 get_parts_resource_objects_limit; __u8 set_parts_resource_objects_limit; }; -#define MAX_CAP_ID __KERNEL_DIV_ROUND_UP(VIRTIO_DEV_PARTS_CAP + 1, 64) +#define VIRTIO_ADMIN_CAP_ID_ARRAY_SIZE __KERNEL_DIV_ROUND_UP(VIRTIO_ADMIN_MAX_CAP, 64) struct virtio_admin_cmd_query_cap_id_result { - __le64 supported_caps[MAX_CAP_ID]; + __le64 supported_caps[VIRTIO_ADMIN_CAP_ID_ARRAY_SIZE]; }; struct virtio_admin_cmd_cap_get_data { -- 2.45.0