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Merge tag 'to-linus' of git://github.com/rustyrussell/linux

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* tag 'to-linus' of git://github.com/rustyrussell/linux: (24 commits)
  lguest: Make sure interrupt is allocated ok by lguest_setup_irq
  lguest: move the lguest tool to the tools directory
  lguest: switch segment-voodoo-numbers to readable symbols
  virtio: balloon: Add freeze, restore handlers to support S4
  virtio: balloon: Move vq initialization into separate function
  virtio: net: Add freeze, restore handlers to support S4
  virtio: net: Move vq and vq buf removal into separate function
  virtio: net: Move vq initialization into separate function
  virtio: blk: Add freeze, restore handlers to support S4
  virtio: blk: Move vq initialization to separate function
  virtio: console: Disable callbacks for virtqueues at start of S4 freeze
  virtio: console: Add freeze and restore handlers to support S4
  virtio: console: Move vq and vq buf removal into separate functions
  virtio: pci: add PM notification handlers for restore, freeze, thaw, poweroff
  virtio: pci: switch to new PM API
  virtio_blk: fix config handler race
  virtio: add debugging if driver doesn't kick.
  virtio: expose added descriptors immediately.
  virtio: avoid modulus operation.
  virtio: support unlocked queue kick
  ...
This commit is contained in:
Linus Torvalds
2012-01-12 12:37:27 -08:00
parent 61bd5e5683 b6c96c0214
commit bcf8a3dfcb
23 changed files with 761 additions and 251 deletions
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77
include/linux/virtio.h
View File

@@ -25,71 +25,19 @@ struct virtqueue {
void *priv;
};
/**
* operations for virtqueue
* virtqueue_add_buf: expose buffer to other end
* vq: the struct virtqueue we're talking about.
* sg: the description of the buffer(s).
* out_num: the number of sg readable by other side
* in_num: the number of sg which are writable (after readable ones)
* data: the token identifying the buffer.
* gfp: how to do memory allocations (if necessary).
* Returns remaining capacity of queue (sg segments) or a negative error.
* virtqueue_kick: update after add_buf
* vq: the struct virtqueue
* After one or more add_buf calls, invoke this to kick the other side.
* virtqueue_get_buf: get the next used buffer
* vq: the struct virtqueue we're talking about.
* len: the length written into the buffer
* Returns NULL or the "data" token handed to add_buf.
* virtqueue_disable_cb: disable callbacks
* vq: the struct virtqueue we're talking about.
* Note that this is not necessarily synchronous, hence unreliable and only
* useful as an optimization.
* virtqueue_enable_cb: restart callbacks after disable_cb.
* vq: the struct virtqueue we're talking about.
* This re-enables callbacks; it returns "false" if there are pending
* buffers in the queue, to detect a possible race between the driver
* checking for more work, and enabling callbacks.
* virtqueue_enable_cb_delayed: restart callbacks after disable_cb.
* vq: the struct virtqueue we're talking about.
* This re-enables callbacks but hints to the other side to delay
* interrupts until most of the available buffers have been processed;
* it returns "false" if there are many pending buffers in the queue,
* to detect a possible race between the driver checking for more work,
* and enabling callbacks.
* virtqueue_detach_unused_buf: detach first unused buffer
* vq: the struct virtqueue we're talking about.
* Returns NULL or the "data" token handed to add_buf
* virtqueue_get_vring_size: return the size of the virtqueue's vring
* vq: the struct virtqueue containing the vring of interest.
* Returns the size of the vring.
*
* Locking rules are straightforward: the driver is responsible for
* locking. No two operations may be invoked simultaneously, with the exception
* of virtqueue_disable_cb.
*
* All operations can be called in any context.
*/
int virtqueue_add_buf_gfp(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data,
gfp_t gfp);
static inline int virtqueue_add_buf(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data)
{
return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
}
int virtqueue_add_buf(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data,
gfp_t gfp);
void virtqueue_kick(struct virtqueue *vq);
bool virtqueue_kick_prepare(struct virtqueue *vq);
void virtqueue_notify(struct virtqueue *vq);
void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
void virtqueue_disable_cb(struct virtqueue *vq);
@@ -146,6 +94,11 @@ struct virtio_driver {
int (*probe)(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 (*thaw)(struct virtio_device *dev);
int (*restore)(struct virtio_device *dev);
#endif
};
int register_virtio_driver(struct virtio_driver *drv);

1
include/linux/virtio_ring.h
View File

@@ -168,6 +168,7 @@ struct virtqueue;
struct virtqueue *vring_new_virtqueue(unsigned int num,
unsigned int vring_align,
struct virtio_device *vdev,
bool weak_barriers,
void *pages,
void (*notify)(struct virtqueue *vq),
void (*callback)(struct virtqueue *vq),