diff options
Diffstat (limited to 'include/linux/virtio.h')
| -rw-r--r-- | include/linux/virtio.h | 220 |
1 files changed, 174 insertions, 46 deletions
diff --git a/include/linux/virtio.h b/include/linux/virtio.h index fa1b5da2804e..132a474e5914 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -9,10 +9,12 @@ #include <linux/device.h> #include <linux/mod_devicetable.h> #include <linux/gfp.h> -#include <linux/vringh.h> +#include <linux/dma-mapping.h> +#include <linux/completion.h> +#include <linux/virtio_features.h> /** - * virtqueue - a queue to register buffers for sending or receiving. + * struct virtqueue - a queue to register buffers for sending or receiving. * @list: the chain of virtqueues for this device * @callback: the function to call when buffers are consumed (can be NULL). * @name: the name of this virtqueue (mainly for debugging) @@ -20,6 +22,8 @@ * @priv: a pointer for the virtqueue implementation to use. * @index: the zero-based ordinal number for this queue. * @num_free: number of elements we expect to be able to fit. + * @num_max: the maximum number of elements supported by the device. + * @reset: vq is in reset state or not. * * A note on @num_free: with indirect buffers, each buffer needs one * element in the queue, otherwise a buffer will need one element per @@ -32,9 +36,20 @@ struct virtqueue { struct virtio_device *vdev; unsigned int index; unsigned int num_free; + unsigned int num_max; + bool reset; void *priv; }; +struct vduse_iova_domain; + +union virtio_map { + /* Device that performs DMA */ + struct device *dma_dev; + /* VDUSE specific mapping data */ + struct vduse_iova_domain *iova_domain; +}; + int virtqueue_add_outbuf(struct virtqueue *vq, struct scatterlist sg[], unsigned int num, void *data, @@ -51,6 +66,17 @@ int virtqueue_add_inbuf_ctx(struct virtqueue *vq, void *ctx, gfp_t gfp); +int virtqueue_add_inbuf_premapped(struct virtqueue *vq, + struct scatterlist *sg, unsigned int num, + void *data, + void *ctx, + gfp_t gfp); + +int virtqueue_add_outbuf_premapped(struct virtqueue *vq, + struct scatterlist *sg, unsigned int num, + void *data, + gfp_t gfp); + int virtqueue_add_sgs(struct virtqueue *vq, struct scatterlist *sgs[], unsigned int out_sgs, @@ -58,6 +84,8 @@ int virtqueue_add_sgs(struct virtqueue *vq, void *data, gfp_t gfp); +struct device *virtqueue_dma_dev(struct virtqueue *vq); + bool virtqueue_kick(struct virtqueue *vq); bool virtqueue_kick_prepare(struct virtqueue *vq); @@ -81,93 +109,119 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *vq); void *virtqueue_detach_unused_buf(struct virtqueue *vq); -unsigned int virtqueue_get_vring_size(struct virtqueue *vq); +unsigned int virtqueue_get_vring_size(const struct virtqueue *vq); -bool virtqueue_is_broken(struct virtqueue *vq); +bool virtqueue_is_broken(const struct virtqueue *vq); -const struct vring *virtqueue_get_vring(struct virtqueue *vq); -dma_addr_t virtqueue_get_desc_addr(struct virtqueue *vq); -dma_addr_t virtqueue_get_avail_addr(struct virtqueue *vq); -dma_addr_t virtqueue_get_used_addr(struct virtqueue *vq); +const struct vring *virtqueue_get_vring(const struct virtqueue *vq); +dma_addr_t virtqueue_get_desc_addr(const struct virtqueue *vq); +dma_addr_t virtqueue_get_avail_addr(const struct virtqueue *vq); +dma_addr_t virtqueue_get_used_addr(const struct virtqueue *vq); -/* - * Legacy accessors -- in almost all cases, these are the wrong functions - * to use. - */ -static inline void *virtqueue_get_desc(struct virtqueue *vq) -{ - return virtqueue_get_vring(vq)->desc; -} -static inline void *virtqueue_get_avail(struct virtqueue *vq) -{ - return virtqueue_get_vring(vq)->avail; -} -static inline void *virtqueue_get_used(struct virtqueue *vq) -{ - return virtqueue_get_vring(vq)->used; -} +int virtqueue_resize(struct virtqueue *vq, u32 num, + void (*recycle)(struct virtqueue *vq, void *buf), + void (*recycle_done)(struct virtqueue *vq)); +int virtqueue_reset(struct virtqueue *vq, + void (*recycle)(struct virtqueue *vq, void *buf), + void (*recycle_done)(struct virtqueue *vq)); + +struct virtio_admin_cmd { + __le16 opcode; + __le16 group_type; + __le64 group_member_id; + struct scatterlist *data_sg; + struct scatterlist *result_sg; + struct completion completion; + u32 result_sg_size; + int ret; +}; /** - * virtio_device - representation of a device using virtio + * struct virtio_device - representation of a device using virtio * @index: unique position on the virtio bus * @failed: saved value for VIRTIO_CONFIG_S_FAILED bit (for restore) - * @config_enabled: configuration change reporting enabled + * @config_core_enabled: configuration change reporting enabled by core + * @config_driver_disabled: configuration change reporting disabled by + * a driver * @config_change_pending: configuration change reported while disabled * @config_lock: protects configuration change reporting + * @vqs_list_lock: protects @vqs. * @dev: underlying device. * @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. * @vqs: the list of virtqueues for this device. - * @features: the features supported by both driver and device. + * @features: the 64 lower features supported by both driver and device. + * @features_array: the full features space supported by both driver and + * device. * @priv: private pointer for the driver's use. + * @debugfs_dir: debugfs directory entry. + * @debugfs_filter_features: features to be filtered set by debugfs. */ struct virtio_device { int index; bool failed; - bool config_enabled; + bool config_core_enabled; + bool config_driver_disabled; bool config_change_pending; spinlock_t config_lock; + spinlock_t vqs_list_lock; struct device dev; struct virtio_device_id id; const struct virtio_config_ops *config; const struct vringh_config_ops *vringh_config; + const struct virtio_map_ops *map; struct list_head vqs; - u64 features; + VIRTIO_DECLARE_FEATURES(features); void *priv; + union virtio_map vmap; +#ifdef CONFIG_VIRTIO_DEBUG + struct dentry *debugfs_dir; + u64 debugfs_filter_features[VIRTIO_FEATURES_U64S]; +#endif }; -static inline struct virtio_device *dev_to_virtio(struct device *_dev) -{ - return container_of(_dev, struct virtio_device, dev); -} +#define dev_to_virtio(_dev) container_of_const(_dev, struct virtio_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); +void __virtio_unbreak_device(struct virtio_device *dev); + +void __virtqueue_break(struct virtqueue *_vq); +void __virtqueue_unbreak(struct virtqueue *_vq); void virtio_config_changed(struct virtio_device *dev); -void virtio_config_disable(struct virtio_device *dev); -void virtio_config_enable(struct virtio_device *dev); -int virtio_finalize_features(struct virtio_device *dev); + +void virtio_config_driver_disable(struct virtio_device *dev); +void virtio_config_driver_enable(struct virtio_device *dev); + #ifdef CONFIG_PM_SLEEP int virtio_device_freeze(struct virtio_device *dev); int virtio_device_restore(struct virtio_device *dev); #endif +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); + +size_t virtio_max_dma_size(const struct virtio_device *vdev); #define virtio_device_for_each_vq(vdev, vq) \ - list_for_each_entry(vq, &vdev->vqs, list) + list_for_each_entry(vq, &(vdev)->vqs, list) /** - * virtio_driver - operations for a virtio I/O driver - * @driver: underlying device driver (populate name and owner). + * struct virtio_driver - operations for a virtio I/O driver + * @driver: underlying device driver (populate name). * @id_table: the ids serviced by this driver. * @feature_table: an array of feature numbers supported by this driver. * @feature_table_size: number of entries in the feature table array. * @feature_table_legacy: same as feature_table but when working in legacy mode. * @feature_table_size_legacy: number of entries in feature table legacy array. + * @validate: the function to call to validate features and config space. + * Returns 0 or -errno. * @probe: the function to call when a device is found. Returns 0 or -errno. * @scan: optional function to call after successful probe; intended * for virtio-scsi to invoke a scan. @@ -176,6 +230,12 @@ int virtio_device_restore(struct virtio_device *dev); * changes; may be called in interrupt context. * @freeze: optional function to call during suspend/hibernation. * @restore: optional function to call on resume. + * @reset_prepare: optional function to call when a transport specific reset + * occurs. + * @reset_done: optional function to call after transport specific reset + * operation has finished. + * @shutdown: synchronize with the device on shutdown. If provided, replaces + * the virtio core implementation. */ struct virtio_driver { struct device_driver driver; @@ -189,18 +249,19 @@ struct virtio_driver { void (*scan)(struct virtio_device *dev); void (*remove)(struct virtio_device *dev); void (*config_changed)(struct virtio_device *dev); -#ifdef CONFIG_PM int (*freeze)(struct virtio_device *dev); int (*restore)(struct virtio_device *dev); -#endif + int (*reset_prepare)(struct virtio_device *dev); + int (*reset_done)(struct virtio_device *dev); + void (*shutdown)(struct virtio_device *dev); }; -static inline struct virtio_driver *drv_to_virtio(struct device_driver *drv) -{ - return container_of(drv, struct virtio_driver, driver); -} +#define drv_to_virtio(__drv) container_of_const(__drv, struct virtio_driver, driver) -int register_virtio_driver(struct virtio_driver *drv); +/* use a macro to avoid include chaining to get THIS_MODULE */ +#define register_virtio_driver(drv) \ + __register_virtio_driver(drv, THIS_MODULE) +int __register_virtio_driver(struct virtio_driver *drv, struct module *owner); void unregister_virtio_driver(struct virtio_driver *drv); /* module_virtio_driver() - Helper macro for drivers that don't do @@ -211,4 +272,71 @@ void unregister_virtio_driver(struct virtio_driver *drv); #define module_virtio_driver(__virtio_driver) \ module_driver(__virtio_driver, register_virtio_driver, \ unregister_virtio_driver) + + +void *virtqueue_map_alloc_coherent(struct virtio_device *vdev, + union virtio_map mapping_token, + size_t size, dma_addr_t *dma_handle, + gfp_t gfp); + +void virtqueue_map_free_coherent(struct virtio_device *vdev, + union virtio_map mapping_token, + size_t size, void *vaddr, + dma_addr_t dma_handle); + +dma_addr_t virtqueue_map_page_attrs(const struct virtqueue *_vq, + struct page *page, + unsigned long offset, + size_t size, + enum dma_data_direction dir, + unsigned long attrs); + +void virtqueue_unmap_page_attrs(const struct virtqueue *_vq, + dma_addr_t dma_handle, + size_t size, enum dma_data_direction dir, + unsigned long attrs); + +dma_addr_t virtqueue_map_single_attrs(const struct virtqueue *_vq, void *ptr, size_t size, + enum dma_data_direction dir, unsigned long attrs); +void virtqueue_unmap_single_attrs(const struct virtqueue *_vq, dma_addr_t addr, + size_t size, enum dma_data_direction dir, + unsigned long attrs); +int virtqueue_map_mapping_error(const struct virtqueue *_vq, dma_addr_t addr); + +bool virtqueue_map_need_sync(const struct virtqueue *_vq, dma_addr_t addr); +void virtqueue_map_sync_single_range_for_cpu(const struct virtqueue *_vq, dma_addr_t addr, + unsigned long offset, size_t size, + enum dma_data_direction dir); +void virtqueue_map_sync_single_range_for_device(const struct virtqueue *_vq, dma_addr_t addr, + unsigned long offset, size_t size, + enum dma_data_direction dir); + +#ifdef CONFIG_VIRTIO_DEBUG +void virtio_debug_device_init(struct virtio_device *dev); +void virtio_debug_device_exit(struct virtio_device *dev); +void virtio_debug_device_filter_features(struct virtio_device *dev); +void virtio_debug_init(void); +void virtio_debug_exit(void); +#else +static inline void virtio_debug_device_init(struct virtio_device *dev) +{ +} + +static inline void virtio_debug_device_exit(struct virtio_device *dev) +{ +} + +static inline void virtio_debug_device_filter_features(struct virtio_device *dev) +{ +} + +static inline void virtio_debug_init(void) +{ +} + +static inline void virtio_debug_exit(void) +{ +} +#endif + #endif /* _LINUX_VIRTIO_H */ |