Virtio patches, mainly hotplugging fixes.
-----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJQFgcxAAoJENkgDmzRrbjxQKkP/A0Vuz9ltiRuaMys5Q6nwPYz pHB1VfTNhCAI+fW8AY3imZD6RngBRk9frezRGkhTwxM33QRPAfZOLUQd0d6PoVD5 rTw8uuA1PwuQIsKAHrFZ27nrdqKb6bWid7tW8ABfpxQzQrVAm3PeUFfvnTT9BsIU OGiZXQkmojgnuIzJjd1wCBroWCrVyIyR4SJcx6ODYlUNOYdwVbi+jiohsZ23iG5h cAYQna4y4UDK16LmTHg7xxnB7WDCD1ZZ1gBNeJBM+f0F1S2xxK50NSpqGoq367NN 6QRsZM9mqofMRZgpYSe6Yl9wd/STiMFysNiQHwhSkvhnT+Sf2gpAcZZ570gGdNMN CR90RcaK+IDJ9i4XMs2LVcjnt3uEznpKhgpq0Lvnw2S0P7KUCbR8ti+jR8LZR/8F eSVcvEJKOzZSWp6P6BHSHK1K/D/b31/qKXEESAnGGVNRheq4o5jA2TvyzDCAAohH Y70KCNYO/kqiZGM1bbb/VvmiiaD/aYRHQOg8Ef7wjVE/0HoMRR5xQeW7tonw2krZ 35//eT0AJimAhdZCaw+JkANw+wI+bIQGc8IjHZhvWzSRWH0Fb5SJAWhV7urD4O6K Nbzclzx2aB6ZNmIsh9cCaJ4a+/i0jO1ql/VJYwBMmwcRLlrYdjLLX/SXcBCY/KFj yFPzDMqQCOJm9grTxn1m =kIHV -----END PGP SIGNATURE----- Merge tag 'virtio-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus Pull virtio update from Rusty Russell: "Virtio patches, mainly hotplugging fixes." * tag 'virtio-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: virtio-blk: return VIRTIO_BLK_F_FLUSH to header. virtio-blk: allow toggling host cache between writeback and writethrough virtio-blk: Use block layer provided spinlock virtio-blk: Reset device after blk_cleanup_queue() virtio-blk: Call del_gendisk() before disable guest kick virtio: rng: s3/s4 support virtio: rng: split out common code in probe / remove for s3/s4 ops virtio: rng: don't wait on host when module is going away virtio: rng: allow tasks to be killed that are waiting for rng input virtio ids: fix comment for virtio-rng
This commit is contained in:
Linus Torvalds
commit
95b18e6995
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@ -21,8 +21,6 @@ struct workqueue_struct *virtblk_wq;
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struct virtio_blk
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{
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spinlock_t lock;
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struct virtio_device *vdev;
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struct virtqueue *vq;
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@ -65,7 +63,7 @@ static void blk_done(struct virtqueue *vq)
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unsigned int len;
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unsigned long flags;
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spin_lock_irqsave(&vblk->lock, flags);
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spin_lock_irqsave(vblk->disk->queue->queue_lock, flags);
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while ((vbr = virtqueue_get_buf(vblk->vq, &len)) != NULL) {
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int error;
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@ -99,7 +97,7 @@ static void blk_done(struct virtqueue *vq)
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}
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/* In case queue is stopped waiting for more buffers. */
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blk_start_queue(vblk->disk->queue);
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spin_unlock_irqrestore(&vblk->lock, flags);
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spin_unlock_irqrestore(vblk->disk->queue->queue_lock, flags);
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}
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static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
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@ -397,6 +395,83 @@ static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
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return 0;
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}
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static int virtblk_get_cache_mode(struct virtio_device *vdev)
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{
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u8 writeback;
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int err;
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err = virtio_config_val(vdev, VIRTIO_BLK_F_CONFIG_WCE,
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offsetof(struct virtio_blk_config, wce),
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&writeback);
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if (err)
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writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_WCE);
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return writeback;
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}
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static void virtblk_update_cache_mode(struct virtio_device *vdev)
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{
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u8 writeback = virtblk_get_cache_mode(vdev);
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struct virtio_blk *vblk = vdev->priv;
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if (writeback)
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blk_queue_flush(vblk->disk->queue, REQ_FLUSH);
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else
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blk_queue_flush(vblk->disk->queue, 0);
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revalidate_disk(vblk->disk);
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}
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static const char *const virtblk_cache_types[] = {
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"write through", "write back"
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};
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static ssize_t
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virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct gendisk *disk = dev_to_disk(dev);
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struct virtio_blk *vblk = disk->private_data;
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struct virtio_device *vdev = vblk->vdev;
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int i;
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u8 writeback;
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BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
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for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; )
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if (sysfs_streq(buf, virtblk_cache_types[i]))
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break;
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if (i < 0)
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return -EINVAL;
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writeback = i;
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vdev->config->set(vdev,
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offsetof(struct virtio_blk_config, wce),
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&writeback, sizeof(writeback));
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virtblk_update_cache_mode(vdev);
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return count;
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}
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static ssize_t
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virtblk_cache_type_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct gendisk *disk = dev_to_disk(dev);
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struct virtio_blk *vblk = disk->private_data;
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u8 writeback = virtblk_get_cache_mode(vblk->vdev);
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BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
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return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]);
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}
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static const struct device_attribute dev_attr_cache_type_ro =
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__ATTR(cache_type, S_IRUGO,
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virtblk_cache_type_show, NULL);
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static const struct device_attribute dev_attr_cache_type_rw =
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__ATTR(cache_type, S_IRUGO|S_IWUSR,
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virtblk_cache_type_show, virtblk_cache_type_store);
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static int __devinit virtblk_probe(struct virtio_device *vdev)
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{
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struct virtio_blk *vblk;
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@ -431,7 +506,6 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
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goto out_free_index;
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}
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spin_lock_init(&vblk->lock);
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vblk->vdev = vdev;
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vblk->sg_elems = sg_elems;
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sg_init_table(vblk->sg, vblk->sg_elems);
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@ -456,7 +530,7 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
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goto out_mempool;
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}
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q = vblk->disk->queue = blk_init_queue(do_virtblk_request, &vblk->lock);
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q = vblk->disk->queue = blk_init_queue(do_virtblk_request, NULL);
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if (!q) {
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err = -ENOMEM;
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goto out_put_disk;
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@ -474,8 +548,7 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
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vblk->index = index;
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/* configure queue flush support */
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if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH))
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blk_queue_flush(q, REQ_FLUSH);
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virtblk_update_cache_mode(vdev);
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/* If disk is read-only in the host, the guest should obey */
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if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
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@ -553,6 +626,14 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
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if (err)
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goto out_del_disk;
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if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
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err = device_create_file(disk_to_dev(vblk->disk),
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&dev_attr_cache_type_rw);
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else
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err = device_create_file(disk_to_dev(vblk->disk),
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&dev_attr_cache_type_ro);
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if (err)
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goto out_del_disk;
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return 0;
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out_del_disk:
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@ -576,30 +657,20 @@ static void __devexit virtblk_remove(struct virtio_device *vdev)
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{
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struct virtio_blk *vblk = vdev->priv;
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int index = vblk->index;
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struct virtblk_req *vbr;
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unsigned long flags;
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/* Prevent config work handler from accessing the device. */
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mutex_lock(&vblk->config_lock);
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vblk->config_enable = false;
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mutex_unlock(&vblk->config_lock);
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del_gendisk(vblk->disk);
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blk_cleanup_queue(vblk->disk->queue);
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/* Stop all the virtqueues. */
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vdev->config->reset(vdev);
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flush_work(&vblk->config_work);
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del_gendisk(vblk->disk);
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/* Abort requests dispatched to driver. */
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spin_lock_irqsave(&vblk->lock, flags);
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while ((vbr = virtqueue_detach_unused_buf(vblk->vq))) {
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__blk_end_request_all(vbr->req, -EIO);
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mempool_free(vbr, vblk->pool);
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}
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spin_unlock_irqrestore(&vblk->lock, flags);
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blk_cleanup_queue(vblk->disk->queue);
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put_disk(vblk->disk);
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mempool_destroy(vblk->pool);
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vdev->config->del_vqs(vdev);
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@ -655,7 +726,7 @@ static const struct virtio_device_id id_table[] = {
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static unsigned int features[] = {
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VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
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VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,
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VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY
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VIRTIO_BLK_F_WCE, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE
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};
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/*
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@ -55,6 +55,7 @@ static void register_buffer(u8 *buf, size_t size)
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static int virtio_read(struct hwrng *rng, void *buf, size_t size, bool wait)
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{
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int ret;
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if (!busy) {
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busy = true;
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@ -65,7 +66,9 @@ static int virtio_read(struct hwrng *rng, void *buf, size_t size, bool wait)
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if (!wait)
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return 0;
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wait_for_completion(&have_data);
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ret = wait_for_completion_killable(&have_data);
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if (ret < 0)
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return ret;
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busy = false;
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@ -85,7 +88,7 @@ static struct hwrng virtio_hwrng = {
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.read = virtio_read,
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};
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static int virtrng_probe(struct virtio_device *vdev)
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static int probe_common(struct virtio_device *vdev)
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{
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int err;
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@ -103,13 +106,37 @@ static int virtrng_probe(struct virtio_device *vdev)
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return 0;
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}
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static void __devexit virtrng_remove(struct virtio_device *vdev)
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static void remove_common(struct virtio_device *vdev)
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{
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vdev->config->reset(vdev);
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busy = false;
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hwrng_unregister(&virtio_hwrng);
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vdev->config->del_vqs(vdev);
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}
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static int virtrng_probe(struct virtio_device *vdev)
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{
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return probe_common(vdev);
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}
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static void __devexit virtrng_remove(struct virtio_device *vdev)
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{
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remove_common(vdev);
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}
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#ifdef CONFIG_PM
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static int virtrng_freeze(struct virtio_device *vdev)
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{
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remove_common(vdev);
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return 0;
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}
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static int virtrng_restore(struct virtio_device *vdev)
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{
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return probe_common(vdev);
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}
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#endif
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static struct virtio_device_id id_table[] = {
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{ VIRTIO_ID_RNG, VIRTIO_DEV_ANY_ID },
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{ 0 },
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@ -121,6 +148,10 @@ static struct virtio_driver virtio_rng_driver = {
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.id_table = id_table,
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.probe = virtrng_probe,
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.remove = __devexit_p(virtrng_remove),
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#ifdef CONFIG_PM
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.freeze = virtrng_freeze,
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.restore = virtrng_restore,
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#endif
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};
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static int __init init(void)
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@ -37,8 +37,14 @@
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#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */
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#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/
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#define VIRTIO_BLK_F_SCSI 7 /* Supports scsi command passthru */
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#define VIRTIO_BLK_F_FLUSH 9 /* Cache flush command support */
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#define VIRTIO_BLK_F_WCE 9 /* Writeback mode enabled after reset */
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#define VIRTIO_BLK_F_TOPOLOGY 10 /* Topology information is available */
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#define VIRTIO_BLK_F_CONFIG_WCE 11 /* Writeback mode available in config */
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#ifndef __KERNEL__
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/* Old (deprecated) name for VIRTIO_BLK_F_WCE. */
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#define VIRTIO_BLK_F_FLUSH VIRTIO_BLK_F_WCE
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#endif
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#define VIRTIO_BLK_ID_BYTES 20 /* ID string length */
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@ -69,6 +75,8 @@ struct virtio_blk_config {
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/* optimal sustained I/O size in logical blocks. */
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__u32 opt_io_size;
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/* writeback mode (if VIRTIO_BLK_F_CONFIG_WCE) */
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__u8 wce;
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} __attribute__((packed));
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/*
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@ -32,7 +32,7 @@
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#define VIRTIO_ID_NET 1 /* virtio net */
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#define VIRTIO_ID_BLOCK 2 /* virtio block */
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#define VIRTIO_ID_CONSOLE 3 /* virtio console */
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#define VIRTIO_ID_RNG 4 /* virtio ring */
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#define VIRTIO_ID_RNG 4 /* virtio rng */
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#define VIRTIO_ID_BALLOON 5 /* virtio balloon */
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#define VIRTIO_ID_RPMSG 7 /* virtio remote processor messaging */
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#define VIRTIO_ID_SCSI 8 /* virtio scsi */
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