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8d2da07c81
When virtqueue_reset() has actually recycled all unused buffers, additional work may be required in some cases. Relying solely on its return status is fragile, so introduce a new function argument 'recycle_done', which is invoked when it really occurs. Signed-off-by: Koichiro Den <koichiro.den@canonical.com> Acked-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
295 lines
10 KiB
C
295 lines
10 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_VIRTIO_H
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#define _LINUX_VIRTIO_H
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/* Everything a virtio driver needs to work with any particular virtio
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* implementation. */
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/gfp.h>
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#include <linux/dma-mapping.h>
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#include <linux/completion.h>
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/**
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* struct virtqueue - a queue to register buffers for sending or receiving.
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* @list: the chain of virtqueues for this device
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* @callback: the function to call when buffers are consumed (can be NULL).
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* @name: the name of this virtqueue (mainly for debugging)
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* @vdev: the virtio device this queue was created for.
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* @priv: a pointer for the virtqueue implementation to use.
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* @index: the zero-based ordinal number for this queue.
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* @num_free: number of elements we expect to be able to fit.
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* @num_max: the maximum number of elements supported by the device.
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* @reset: vq is in reset state or not.
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*
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* A note on @num_free: with indirect buffers, each buffer needs one
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* element in the queue, otherwise a buffer will need one element per
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* sg element.
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*/
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struct virtqueue {
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struct list_head list;
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void (*callback)(struct virtqueue *vq);
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const char *name;
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struct virtio_device *vdev;
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unsigned int index;
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unsigned int num_free;
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unsigned int num_max;
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bool reset;
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void *priv;
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};
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int virtqueue_add_outbuf(struct virtqueue *vq,
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struct scatterlist sg[], unsigned int num,
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void *data,
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gfp_t gfp);
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int virtqueue_add_inbuf(struct virtqueue *vq,
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struct scatterlist sg[], unsigned int num,
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void *data,
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gfp_t gfp);
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int virtqueue_add_inbuf_ctx(struct virtqueue *vq,
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struct scatterlist sg[], unsigned int num,
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void *data,
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void *ctx,
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gfp_t gfp);
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int virtqueue_add_inbuf_premapped(struct virtqueue *vq,
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struct scatterlist *sg, unsigned int num,
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void *data,
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void *ctx,
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gfp_t gfp);
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int virtqueue_add_outbuf_premapped(struct virtqueue *vq,
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struct scatterlist *sg, unsigned int num,
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void *data,
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gfp_t gfp);
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int virtqueue_add_sgs(struct virtqueue *vq,
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struct scatterlist *sgs[],
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unsigned int out_sgs,
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unsigned int in_sgs,
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void *data,
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gfp_t gfp);
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struct device *virtqueue_dma_dev(struct virtqueue *vq);
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bool virtqueue_kick(struct virtqueue *vq);
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bool virtqueue_kick_prepare(struct virtqueue *vq);
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bool virtqueue_notify(struct virtqueue *vq);
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void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
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void *virtqueue_get_buf_ctx(struct virtqueue *vq, unsigned int *len,
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void **ctx);
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void virtqueue_disable_cb(struct virtqueue *vq);
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bool virtqueue_enable_cb(struct virtqueue *vq);
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unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);
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bool virtqueue_poll(struct virtqueue *vq, unsigned);
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bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
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void *virtqueue_detach_unused_buf(struct virtqueue *vq);
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unsigned int virtqueue_get_vring_size(const struct virtqueue *vq);
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bool virtqueue_is_broken(const struct virtqueue *vq);
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const struct vring *virtqueue_get_vring(const struct virtqueue *vq);
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dma_addr_t virtqueue_get_desc_addr(const struct virtqueue *vq);
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dma_addr_t virtqueue_get_avail_addr(const struct virtqueue *vq);
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dma_addr_t virtqueue_get_used_addr(const struct virtqueue *vq);
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int virtqueue_resize(struct virtqueue *vq, u32 num,
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void (*recycle)(struct virtqueue *vq, void *buf),
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void (*recycle_done)(struct virtqueue *vq));
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int virtqueue_reset(struct virtqueue *vq,
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void (*recycle)(struct virtqueue *vq, void *buf),
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void (*recycle_done)(struct virtqueue *vq));
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struct virtio_admin_cmd {
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__le16 opcode;
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__le16 group_type;
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__le64 group_member_id;
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struct scatterlist *data_sg;
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struct scatterlist *result_sg;
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struct completion completion;
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u32 result_sg_size;
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int ret;
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};
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/**
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* struct virtio_device - representation of a device using virtio
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* @index: unique position on the virtio bus
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* @failed: saved value for VIRTIO_CONFIG_S_FAILED bit (for restore)
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* @config_core_enabled: configuration change reporting enabled by core
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* @config_driver_disabled: configuration change reporting disabled by
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* a driver
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* @config_change_pending: configuration change reported while disabled
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* @config_lock: protects configuration change reporting
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* @vqs_list_lock: protects @vqs.
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* @dev: underlying device.
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* @id: the device type identification (used to match it with a driver).
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* @config: the configuration ops for this device.
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* @vringh_config: configuration ops for host vrings.
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* @vqs: the list of virtqueues for this device.
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* @features: the features supported by both driver and device.
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* @priv: private pointer for the driver's use.
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* @debugfs_dir: debugfs directory entry.
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* @debugfs_filter_features: features to be filtered set by debugfs.
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*/
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struct virtio_device {
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int index;
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bool failed;
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bool config_core_enabled;
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bool config_driver_disabled;
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bool config_change_pending;
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spinlock_t config_lock;
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spinlock_t vqs_list_lock;
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struct device dev;
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struct virtio_device_id id;
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const struct virtio_config_ops *config;
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const struct vringh_config_ops *vringh_config;
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struct list_head vqs;
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u64 features;
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void *priv;
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#ifdef CONFIG_VIRTIO_DEBUG
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struct dentry *debugfs_dir;
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u64 debugfs_filter_features;
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#endif
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};
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#define dev_to_virtio(_dev) container_of_const(_dev, struct virtio_device, dev)
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void virtio_add_status(struct virtio_device *dev, unsigned int status);
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int register_virtio_device(struct virtio_device *dev);
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void unregister_virtio_device(struct virtio_device *dev);
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bool is_virtio_device(struct device *dev);
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void virtio_break_device(struct virtio_device *dev);
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void __virtio_unbreak_device(struct virtio_device *dev);
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void __virtqueue_break(struct virtqueue *_vq);
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void __virtqueue_unbreak(struct virtqueue *_vq);
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void virtio_config_changed(struct virtio_device *dev);
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void virtio_config_driver_disable(struct virtio_device *dev);
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void virtio_config_driver_enable(struct virtio_device *dev);
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#ifdef CONFIG_PM_SLEEP
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int virtio_device_freeze(struct virtio_device *dev);
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int virtio_device_restore(struct virtio_device *dev);
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#endif
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void virtio_reset_device(struct virtio_device *dev);
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size_t virtio_max_dma_size(const struct virtio_device *vdev);
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#define virtio_device_for_each_vq(vdev, vq) \
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list_for_each_entry(vq, &vdev->vqs, list)
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/**
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* struct virtio_driver - operations for a virtio I/O driver
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* @driver: underlying device driver (populate name).
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* @id_table: the ids serviced by this driver.
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* @feature_table: an array of feature numbers supported by this driver.
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* @feature_table_size: number of entries in the feature table array.
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* @feature_table_legacy: same as feature_table but when working in legacy mode.
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* @feature_table_size_legacy: number of entries in feature table legacy array.
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* @validate: the function to call to validate features and config space.
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* Returns 0 or -errno.
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* @probe: the function to call when a device is found. Returns 0 or -errno.
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* @scan: optional function to call after successful probe; intended
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* for virtio-scsi to invoke a scan.
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* @remove: the function to call when a device is removed.
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* @config_changed: optional function to call when the device configuration
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* changes; may be called in interrupt context.
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* @freeze: optional function to call during suspend/hibernation.
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* @restore: optional function to call on resume.
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*/
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struct virtio_driver {
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struct device_driver driver;
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const struct virtio_device_id *id_table;
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const unsigned int *feature_table;
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unsigned int feature_table_size;
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const unsigned int *feature_table_legacy;
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unsigned int feature_table_size_legacy;
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int (*validate)(struct virtio_device *dev);
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int (*probe)(struct virtio_device *dev);
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void (*scan)(struct virtio_device *dev);
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void (*remove)(struct virtio_device *dev);
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void (*config_changed)(struct virtio_device *dev);
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int (*freeze)(struct virtio_device *dev);
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int (*restore)(struct virtio_device *dev);
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};
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#define drv_to_virtio(__drv) container_of_const(__drv, struct virtio_driver, driver)
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/* use a macro to avoid include chaining to get THIS_MODULE */
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#define register_virtio_driver(drv) \
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__register_virtio_driver(drv, THIS_MODULE)
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int __register_virtio_driver(struct virtio_driver *drv, struct module *owner);
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void unregister_virtio_driver(struct virtio_driver *drv);
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/* module_virtio_driver() - Helper macro for drivers that don't do
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* anything special in module init/exit. This eliminates a lot of
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* boilerplate. Each module may only use this macro once, and
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* calling it replaces module_init() and module_exit()
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*/
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#define module_virtio_driver(__virtio_driver) \
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module_driver(__virtio_driver, register_virtio_driver, \
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unregister_virtio_driver)
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dma_addr_t virtqueue_dma_map_single_attrs(struct virtqueue *_vq, void *ptr, size_t size,
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enum dma_data_direction dir, unsigned long attrs);
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void virtqueue_dma_unmap_single_attrs(struct virtqueue *_vq, dma_addr_t addr,
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size_t size, enum dma_data_direction dir,
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unsigned long attrs);
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int virtqueue_dma_mapping_error(struct virtqueue *_vq, dma_addr_t addr);
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bool virtqueue_dma_need_sync(struct virtqueue *_vq, dma_addr_t addr);
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void virtqueue_dma_sync_single_range_for_cpu(struct virtqueue *_vq, dma_addr_t addr,
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unsigned long offset, size_t size,
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enum dma_data_direction dir);
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void virtqueue_dma_sync_single_range_for_device(struct virtqueue *_vq, dma_addr_t addr,
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unsigned long offset, size_t size,
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enum dma_data_direction dir);
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#ifdef CONFIG_VIRTIO_DEBUG
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void virtio_debug_device_init(struct virtio_device *dev);
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void virtio_debug_device_exit(struct virtio_device *dev);
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void virtio_debug_device_filter_features(struct virtio_device *dev);
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void virtio_debug_init(void);
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void virtio_debug_exit(void);
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#else
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static inline void virtio_debug_device_init(struct virtio_device *dev)
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{
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}
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static inline void virtio_debug_device_exit(struct virtio_device *dev)
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{
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}
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static inline void virtio_debug_device_filter_features(struct virtio_device *dev)
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{
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}
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static inline void virtio_debug_init(void)
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{
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}
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static inline void virtio_debug_exit(void)
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{
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}
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#endif
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#endif /* _LINUX_VIRTIO_H */
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