search for: blk_queue_ord

...ue is ordered */ + /* + * If barriers are supported, tell block layer that queue is ordered. + * + * If no barriers are supported assume the host uses synchronous + * writes and just drain the the queue before and after the barrier. + */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); + else + blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_DRAIN, NULL); /* If disk is read-only in the host, the guest should obey */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))

...ue is ordered */ + /* + * If barriers are supported, tell block layer that queue is ordered. + * + * If no barriers are supported assume the host uses synchronous + * writes and just drain the the queue before and after the barrier. + */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); + else + blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_DRAIN, NULL); /* If disk is read-only in the host, the guest should obey */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))

...Index: kvm/drivers/block/virtio_blk.c =================================================================== --- kvm.orig/drivers/block/virtio_blk.c +++ kvm/drivers/block/virtio_blk.c @@ -260,6 +260,10 @@ static int virtblk_probe(struct virtio_d if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); + /* If disk is read-only in the host, the guest should obey */ + if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) + set_disk_ro(vblk->disk, 1); + /* Host must always specify the capacity. */ vdev->config->get(vdev, offsetof(struc...

...ity(bd->bd_disk) >> 11; } + + printk("totsegs = %lu totlen = %lu\n", totsegs, totlen); + totsegs = totlen = 0; return 0; } @@ -260,6 +271,9 @@ /* If barriers are supported, tell block layer that queue is ordered */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); + + /* Gather adjacent buffers to minimize sg length. */ + queue_flag_set(QUEUE_FLAG_CLUSTER, vblk->disk->queue); /* If disk is read-only in the host, the guest should obey */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))

...ity(bd->bd_disk) >> 11; } + + printk("totsegs = %lu totlen = %lu\n", totsegs, totlen); + totsegs = totlen = 0; return 0; } @@ -260,6 +271,9 @@ /* If barriers are supported, tell block layer that queue is ordered */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); + + /* Gather adjacent buffers to minimize sg length. */ + queue_flag_set(QUEUE_FLAG_CLUSTER, vblk->disk->queue); /* If disk is read-only in the host, the guest should obey */ if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))

...k->disk->first_minor = minor; vblk->disk->private_data = vblk; vblk->disk->fops = &virtblk_fops; + minor += 1 << PART_BITS; + /* If barriers are supported, tell block layer that queue is ordered */ if (vdev->config->feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); @@ -260,8 +262,6 @@ static int virtblk_probe(struct virtio_d out_put_disk: put_disk(vblk->disk); -out_unregister_blkdev: - unregister_blkdev(major, "virtblk"); out_mempool: mempool_destroy(vblk->pool); out_free_vq: @@ -...

...k->disk->first_minor = minor; vblk->disk->private_data = vblk; vblk->disk->fops = &virtblk_fops; + minor += 1 << PART_BITS; + /* If barriers are supported, tell block layer that queue is ordered */ if (vdev->config->feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); @@ -260,8 +262,6 @@ static int virtblk_probe(struct virtio_d out_put_disk: put_disk(vblk->disk); -out_unregister_blkdev: - unregister_blkdev(major, "virtblk"); out_mempool: mempool_destroy(vblk->pool); out_free_vq: @@ -...

...------ 3 files changed, 21 insertions(+), 36 deletions(-) diff -r a098f19a6da5 drivers/block/virtio_blk.c --- a/drivers/block/virtio_blk.c Sun Apr 20 14:41:02 2008 +1000 +++ b/drivers/block/virtio_blk.c Sun Apr 20 15:07:45 2008 +1000 @@ -246,8 +246,8 @@ static int virtblk_probe(struct virtio_d blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); /* Host must always specify the capacity. */ - __virtio_config_val(vdev, offsetof(struct virtio_blk_config, capacity), - &cap); + vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), + &cap, sizeof(c...

...------ 3 files changed, 21 insertions(+), 36 deletions(-) diff -r a098f19a6da5 drivers/block/virtio_blk.c --- a/drivers/block/virtio_blk.c Sun Apr 20 14:41:02 2008 +1000 +++ b/drivers/block/virtio_blk.c Sun Apr 20 15:07:45 2008 +1000 @@ -246,8 +246,8 @@ static int virtblk_probe(struct virtio_d blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); /* Host must always specify the capacity. */ - __virtio_config_val(vdev, offsetof(struct virtio_blk_config, capacity), - &cap); + vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), + &cap, sizeof(c...

In response to Avi's excellent analysis, I've updated virtio as promised (apologies for the delay, travel got in the way). === This attempts to implement a "virtual I/O" layer which should allow common drivers to be efficiently used across most virtual I/O mechanisms. It will no-doubt need further enhancement. The details of probing the device are left to hypervisor-specific

In response to Avi's excellent analysis, I've updated virtio as promised (apologies for the delay, travel got in the way). === This attempts to implement a "virtual I/O" layer which should allow common drivers to be efficiently used across most virtual I/O mechanisms. It will no-doubt need further enhancement. The details of probing the device are left to hypervisor-specific

This patch changes virtio_pci to use a shared memory area for virtio config info instead of using the PCI configuration space. This is closer semantically to what the virtio API exposes and is it a lot easier to implement on both ends. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c index eb9a8e0..7e6e453 100644

This patch changes virtio_pci to use a shared memory area for virtio config info instead of using the PCI configuration space. This is closer semantically to what the virtio API exposes and is it a lot easier to implement on both ends. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c index eb9a8e0..7e6e453 100644

Hi again all, It turns out that networking really wants ordered requests, which the previous patches didn't allow. This patch changes it to a callback mechanism; kudos to Avi. The downside is that locking is more complicated, and after a few dead ends I implemented the simplest solution: the struct virtio_device contains the spinlock to use, and it's held when your callbacks get

Hi again all, It turns out that networking really wants ordered requests, which the previous patches didn't allow. This patch changes it to a callback mechanism; kudos to Avi. The downside is that locking is more complicated, and after a few dead ends I implemented the simplest solution: the struct virtio_device contains the spinlock to use, and it's held when your callbacks get

Hi again all, It turns out that networking really wants ordered requests, which the previous patches didn't allow. This patch changes it to a callback mechanism; kudos to Avi. The downside is that locking is more complicated, and after a few dead ends I implemented the simplest solution: the struct virtio_device contains the spinlock to use, and it's held when your callbacks get

This is a subject that came up in the virtio BOF session at OLS. I decided to go forward and implement something that I like, based on the latest virtio proposal at the time, which was draft III. It's not a drop-in replacement, because it's missing a host implementation. I first started my own, which is not done yet, but wanted to do one for lguest and one for emulated PCI next. It's

This is a subject that came up in the virtio BOF session at OLS. I decided to go forward and implement something that I like, based on the latest virtio proposal at the time, which was draft III. It's not a drop-in replacement, because it's missing a host implementation. I first started my own, which is not done yet, but wanted to do one for lguest and one for emulated PCI next. It's

...ops; /* If barriers are supported, tell block layer that queue is ordered */ - token = vdev->config->find(vdev, VIRTIO_CONFIG_BLK_F, &len); - if (virtio_use_bit(vdev, token, len, VIRTIO_BLK_F_BARRIER)) + if (vdev->config->feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); - err = virtio_config_val(vdev, VIRTIO_CONFIG_BLK_F_CAPACITY, &cap); - if (err) { - dev_err(&vdev->dev, "Bad/missing capacity in config\n"); - goto out_cleanup_queue; - } + /* Host must always sp...

...ops; /* If barriers are supported, tell block layer that queue is ordered */ - token = vdev->config->find(vdev, VIRTIO_CONFIG_BLK_F, &len); - if (virtio_use_bit(vdev, token, len, VIRTIO_BLK_F_BARRIER)) + if (vdev->config->feature(vdev, VIRTIO_BLK_F_BARRIER)) blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL); - err = virtio_config_val(vdev, VIRTIO_CONFIG_BLK_F_CAPACITY, &cap); - if (err) { - dev_err(&vdev->dev, "Bad/missing capacity in config\n"); - goto out_cleanup_queue; - } + /* Host must always sp...