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SCSI: Add virtio_scsi driver (Closes: #686636) 

svn path=/dists/sid/linux/; revision=19794
This commit is contained in:
Ben Hutchings 2013-02-07 04:42:39 +00:00
parent 77f1faf401
commit a9e39ce1ee
17 changed files with 2090 additions and 0 deletions
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1
debian/changelog vendored
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@ -127,6 +127,7 @@ linux (3.2.38-1) UNRELEASED; urgency=low
- Also allow this behaviour to be enabled via module parameter
invert_brightness=1
* [amd64] edac: Enable EDAC_SBRIDGE as module (Closes: #699283)
* SCSI: Add virtio_scsi driver (Closes: #686636)
[ Aurelien Jarno ]
* [armhf/vexpress] Add kernel udebs.

1
debian/config/config vendored
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@ -2626,6 +2626,7 @@ CONFIG_SCSI_PMCRAID=m
CONFIG_SCSI_PM8001=m
CONFIG_SCSI_SRP=m
CONFIG_SCSI_BFA_FC=m
CONFIG_SCSI_VIRTIO=m
##
## file: drivers/scsi/aic7xxx/Kconfig.aic79xx

2
debian/config/defines vendored
View File

@ -30,6 +30,8 @@ ignore-changes:
# wanrouter was totally broken
module:drivers/net/wan/cycx_drv
module:net/wanrouter/wanrouter
# No-one tries to use virtio from OOT
module:drivers/virtio/*
[base]
arches:

782
debian/patches/features/all/virtio_scsi/0001-SCSI-virtio-scsi-SCSI-driver-for-QEMU-based-virtual-.patch vendored Normal file
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@ -0,0 +1,782 @@
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Sun, 5 Feb 2012 12:16:00 +0100
Subject: [01/12] [SCSI] virtio-scsi: SCSI driver for QEMU based virtual
machines
commit 4fe74b1cb051dc9d47a80e263c388cf1651783d4 upstream.
The virtio-scsi HBA is the basis of an alternative storage stack
for QEMU-based virtual machines (including KVM). Compared to
virtio-blk it is more scalable, because it supports many LUNs
on a single PCI slot), more powerful (it more easily supports
passthrough of host devices to the guest) and more easily
extensible (new SCSI features implemented by QEMU should not
require updating the driver in the guest).
Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2:
- s/virtqueue_add_buf/&_gfp/
- Remove virtio driver PM operations]
---
drivers/scsi/Kconfig | 8 +
drivers/scsi/Makefile | 1 +
drivers/scsi/virtio_scsi.c | 594 +++++++++++++++++++++++++++++++++++++++++++
include/linux/virtio_ids.h | 1 +
include/linux/virtio_scsi.h | 114 +++++++++
5 files changed, 718 insertions(+)
create mode 100644 drivers/scsi/virtio_scsi.c
create mode 100644 include/linux/virtio_scsi.h
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -1910,6 +1910,14 @@ config SCSI_BFA_FC
To compile this driver as a module, choose M here. The module will
be called bfa.
+config SCSI_VIRTIO
+ tristate "virtio-scsi support (EXPERIMENTAL)"
+ depends on EXPERIMENTAL && VIRTIO
+ help
+ This is the virtual HBA driver for virtio. If the kernel will
+ be used in a virtual machine, say Y or M.
+
+
endif # SCSI_LOWLEVEL
source "drivers/scsi/pcmcia/Kconfig"
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -141,6 +141,7 @@ obj-$(CONFIG_SCSI_CXGB4_ISCSI) += libisc
obj-$(CONFIG_SCSI_BNX2_ISCSI) += libiscsi.o bnx2i/
obj-$(CONFIG_BE2ISCSI) += libiscsi.o be2iscsi/
obj-$(CONFIG_SCSI_PMCRAID) += pmcraid.o
+obj-$(CONFIG_SCSI_VIRTIO) += virtio_scsi.o
obj-$(CONFIG_VMWARE_PVSCSI) += vmw_pvscsi.o
obj-$(CONFIG_HYPERV_STORAGE) += hv_storvsc.o
--- /dev/null
+++ b/drivers/scsi/virtio_scsi.c
@@ -0,0 +1,594 @@
+/*
+ * Virtio SCSI HBA driver
+ *
+ * Copyright IBM Corp. 2010
+ * Copyright Red Hat, Inc. 2011
+ *
+ * Authors:
+ * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
+ * Paolo Bonzini <pbonzini@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/mempool.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+
+#define VIRTIO_SCSI_MEMPOOL_SZ 64
+
+/* Command queue element */
+struct virtio_scsi_cmd {
+ struct scsi_cmnd *sc;
+ struct completion *comp;
+ union {
+ struct virtio_scsi_cmd_req cmd;
+ struct virtio_scsi_ctrl_tmf_req tmf;
+ struct virtio_scsi_ctrl_an_req an;
+ } req;
+ union {
+ struct virtio_scsi_cmd_resp cmd;
+ struct virtio_scsi_ctrl_tmf_resp tmf;
+ struct virtio_scsi_ctrl_an_resp an;
+ struct virtio_scsi_event evt;
+ } resp;
+} ____cacheline_aligned_in_smp;
+
+/* Driver instance state */
+struct virtio_scsi {
+ /* Protects ctrl_vq, req_vq and sg[] */
+ spinlock_t vq_lock;
+
+ struct virtio_device *vdev;
+ struct virtqueue *ctrl_vq;
+ struct virtqueue *event_vq;
+ struct virtqueue *req_vq;
+
+ /* For sglist construction when adding commands to the virtqueue. */
+ struct scatterlist sg[];
+};
+
+static struct kmem_cache *virtscsi_cmd_cache;
+static mempool_t *virtscsi_cmd_pool;
+
+static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev)
+{
+ return vdev->priv;
+}
+
+static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid)
+{
+ if (!resid)
+ return;
+
+ if (!scsi_bidi_cmnd(sc)) {
+ scsi_set_resid(sc, resid);
+ return;
+ }
+
+ scsi_in(sc)->resid = min(resid, scsi_in(sc)->length);
+ scsi_out(sc)->resid = resid - scsi_in(sc)->resid;
+}
+
+/**
+ * virtscsi_complete_cmd - finish a scsi_cmd and invoke scsi_done
+ *
+ * Called with vq_lock held.
+ */
+static void virtscsi_complete_cmd(void *buf)
+{
+ struct virtio_scsi_cmd *cmd = buf;
+ struct scsi_cmnd *sc = cmd->sc;
+ struct virtio_scsi_cmd_resp *resp = &cmd->resp.cmd;
+
+ dev_dbg(&sc->device->sdev_gendev,
+ "cmd %p response %u status %#02x sense_len %u\n",
+ sc, resp->response, resp->status, resp->sense_len);
+
+ sc->result = resp->status;
+ virtscsi_compute_resid(sc, resp->resid);
+ switch (resp->response) {
+ case VIRTIO_SCSI_S_OK:
+ set_host_byte(sc, DID_OK);
+ break;
+ case VIRTIO_SCSI_S_OVERRUN:
+ set_host_byte(sc, DID_ERROR);
+ break;
+ case VIRTIO_SCSI_S_ABORTED:
+ set_host_byte(sc, DID_ABORT);
+ break;
+ case VIRTIO_SCSI_S_BAD_TARGET:
+ set_host_byte(sc, DID_BAD_TARGET);
+ break;
+ case VIRTIO_SCSI_S_RESET:
+ set_host_byte(sc, DID_RESET);
+ break;
+ case VIRTIO_SCSI_S_BUSY:
+ set_host_byte(sc, DID_BUS_BUSY);
+ break;
+ case VIRTIO_SCSI_S_TRANSPORT_FAILURE:
+ set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
+ break;
+ case VIRTIO_SCSI_S_TARGET_FAILURE:
+ set_host_byte(sc, DID_TARGET_FAILURE);
+ break;
+ case VIRTIO_SCSI_S_NEXUS_FAILURE:
+ set_host_byte(sc, DID_NEXUS_FAILURE);
+ break;
+ default:
+ scmd_printk(KERN_WARNING, sc, "Unknown response %d",
+ resp->response);
+ /* fall through */
+ case VIRTIO_SCSI_S_FAILURE:
+ set_host_byte(sc, DID_ERROR);
+ break;
+ }
+
+ WARN_ON(resp->sense_len > VIRTIO_SCSI_SENSE_SIZE);
+ if (sc->sense_buffer) {
+ memcpy(sc->sense_buffer, resp->sense,
+ min_t(u32, resp->sense_len, VIRTIO_SCSI_SENSE_SIZE));
+ if (resp->sense_len)
+ set_driver_byte(sc, DRIVER_SENSE);
+ }
+
+ mempool_free(cmd, virtscsi_cmd_pool);
+ sc->scsi_done(sc);
+}
+
+static void virtscsi_vq_done(struct virtqueue *vq, void (*fn)(void *buf))
+{
+ struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
+ struct virtio_scsi *vscsi = shost_priv(sh);
+ void *buf;
+ unsigned long flags;
+ unsigned int len;
+
+ spin_lock_irqsave(&vscsi->vq_lock, flags);
+
+ do {
+ virtqueue_disable_cb(vq);
+ while ((buf = virtqueue_get_buf(vq, &len)) != NULL)
+ fn(buf);
+ } while (!virtqueue_enable_cb(vq));
+
+ spin_unlock_irqrestore(&vscsi->vq_lock, flags);
+}
+
+static void virtscsi_req_done(struct virtqueue *vq)
+{
+ virtscsi_vq_done(vq, virtscsi_complete_cmd);
+};
+
+static void virtscsi_complete_free(void *buf)
+{
+ struct virtio_scsi_cmd *cmd = buf;
+
+ if (cmd->comp)
+ complete_all(cmd->comp);
+ mempool_free(cmd, virtscsi_cmd_pool);
+}
+
+static void virtscsi_ctrl_done(struct virtqueue *vq)
+{
+ virtscsi_vq_done(vq, virtscsi_complete_free);
+};
+
+static void virtscsi_event_done(struct virtqueue *vq)
+{
+ virtscsi_vq_done(vq, virtscsi_complete_free);
+};
+
+static void virtscsi_map_sgl(struct scatterlist *sg, unsigned int *p_idx,
+ struct scsi_data_buffer *sdb)
+{
+ struct sg_table *table = &sdb->table;
+ struct scatterlist *sg_elem;
+ unsigned int idx = *p_idx;
+ int i;
+
+ for_each_sg(table->sgl, sg_elem, table->nents, i)
+ sg_set_buf(&sg[idx++], sg_virt(sg_elem), sg_elem->length);
+
+ *p_idx = idx;
+}
+
+/**
+ * virtscsi_map_cmd - map a scsi_cmd to a virtqueue scatterlist
+ * @vscsi : virtio_scsi state
+ * @cmd : command structure
+ * @out_num : number of read-only elements
+ * @in_num : number of write-only elements
+ * @req_size : size of the request buffer
+ * @resp_size : size of the response buffer
+ *
+ * Called with vq_lock held.
+ */
+static void virtscsi_map_cmd(struct virtio_scsi *vscsi,
+ struct virtio_scsi_cmd *cmd,
+ unsigned *out_num, unsigned *in_num,
+ size_t req_size, size_t resp_size)
+{
+ struct scsi_cmnd *sc = cmd->sc;
+ struct scatterlist *sg = vscsi->sg;
+ unsigned int idx = 0;
+
+ if (sc) {
+ struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
+ BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize);
+
+ /* TODO: check feature bit and fail if unsupported? */
+ BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL);
+ }
+
+ /* Request header. */
+ sg_set_buf(&sg[idx++], &cmd->req, req_size);
+
+ /* Data-out buffer. */
+ if (sc && sc->sc_data_direction != DMA_FROM_DEVICE)
+ virtscsi_map_sgl(sg, &idx, scsi_out(sc));
+
+ *out_num = idx;
+
+ /* Response header. */
+ sg_set_buf(&sg[idx++], &cmd->resp, resp_size);
+
+ /* Data-in buffer */
+ if (sc && sc->sc_data_direction != DMA_TO_DEVICE)
+ virtscsi_map_sgl(sg, &idx, scsi_in(sc));
+
+ *in_num = idx - *out_num;
+}
+
+static int virtscsi_kick_cmd(struct virtio_scsi *vscsi, struct virtqueue *vq,
+ struct virtio_scsi_cmd *cmd,
+ size_t req_size, size_t resp_size, gfp_t gfp)
+{
+ unsigned int out_num, in_num;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&vscsi->vq_lock, flags);
+
+ virtscsi_map_cmd(vscsi, cmd, &out_num, &in_num, req_size, resp_size);
+
+ ret = virtqueue_add_buf_gfp(vq, vscsi->sg, out_num, in_num, cmd, gfp);
+ if (ret >= 0)
+ virtqueue_kick(vq);
+
+ spin_unlock_irqrestore(&vscsi->vq_lock, flags);
+ return ret;
+}
+
+static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
+{
+ struct virtio_scsi *vscsi = shost_priv(sh);
+ struct virtio_scsi_cmd *cmd;
+ int ret;
+
+ dev_dbg(&sc->device->sdev_gendev,
+ "cmd %p CDB: %#02x\n", sc, sc->cmnd[0]);
+
+ ret = SCSI_MLQUEUE_HOST_BUSY;
+ cmd = mempool_alloc(virtscsi_cmd_pool, GFP_ATOMIC);
+ if (!cmd)
+ goto out;
+
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->sc = sc;
+ cmd->req.cmd = (struct virtio_scsi_cmd_req){
+ .lun[0] = 1,
+ .lun[1] = sc->device->id,
+ .lun[2] = (sc->device->lun >> 8) | 0x40,
+ .lun[3] = sc->device->lun & 0xff,
+ .tag = (unsigned long)sc,
+ .task_attr = VIRTIO_SCSI_S_SIMPLE,
+ .prio = 0,
+ .crn = 0,
+ };
+
+ BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);
+ memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
+
+ if (virtscsi_kick_cmd(vscsi, vscsi->req_vq, cmd,
+ sizeof cmd->req.cmd, sizeof cmd->resp.cmd,
+ GFP_ATOMIC) >= 0)
+ ret = 0;
+
+out:
+ return ret;
+}
+
+static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd)
+{
+ DECLARE_COMPLETION_ONSTACK(comp);
+ int ret;
+
+ cmd->comp = &comp;
+ ret = virtscsi_kick_cmd(vscsi, vscsi->ctrl_vq, cmd,
+ sizeof cmd->req.tmf, sizeof cmd->resp.tmf,
+ GFP_NOIO);
+ if (ret < 0)
+ return FAILED;
+
+ wait_for_completion(&comp);
+ if (cmd->resp.tmf.response != VIRTIO_SCSI_S_OK &&
+ cmd->resp.tmf.response != VIRTIO_SCSI_S_FUNCTION_SUCCEEDED)
+ return FAILED;
+
+ return SUCCESS;
+}
+
+static int virtscsi_device_reset(struct scsi_cmnd *sc)
+{
+ struct virtio_scsi *vscsi = shost_priv(sc->device->host);
+ struct virtio_scsi_cmd *cmd;
+
+ sdev_printk(KERN_INFO, sc->device, "device reset\n");
+ cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO);
+ if (!cmd)
+ return FAILED;
+
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->sc = sc;
+ cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
+ .type = VIRTIO_SCSI_T_TMF,
+ .subtype = VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET,
+ .lun[0] = 1,
+ .lun[1] = sc->device->id,
+ .lun[2] = (sc->device->lun >> 8) | 0x40,
+ .lun[3] = sc->device->lun & 0xff,
+ };
+ return virtscsi_tmf(vscsi, cmd);
+}
+
+static int virtscsi_abort(struct scsi_cmnd *sc)
+{
+ struct virtio_scsi *vscsi = shost_priv(sc->device->host);
+ struct virtio_scsi_cmd *cmd;
+
+ scmd_printk(KERN_INFO, sc, "abort\n");
+ cmd = mempool_alloc(virtscsi_cmd_pool, GFP_NOIO);
+ if (!cmd)
+ return FAILED;
+
+ memset(cmd, 0, sizeof(*cmd));
+ cmd->sc = sc;
+ cmd->req.tmf = (struct virtio_scsi_ctrl_tmf_req){
+ .type = VIRTIO_SCSI_T_TMF,
+ .subtype = VIRTIO_SCSI_T_TMF_ABORT_TASK,
+ .lun[0] = 1,
+ .lun[1] = sc->device->id,
+ .lun[2] = (sc->device->lun >> 8) | 0x40,
+ .lun[3] = sc->device->lun & 0xff,
+ .tag = (unsigned long)sc,
+ };
+ return virtscsi_tmf(vscsi, cmd);
+}
+
+static struct scsi_host_template virtscsi_host_template = {
+ .module = THIS_MODULE,
+ .name = "Virtio SCSI HBA",
+ .proc_name = "virtio_scsi",
+ .queuecommand = virtscsi_queuecommand,
+ .this_id = -1,
+ .eh_abort_handler = virtscsi_abort,
+ .eh_device_reset_handler = virtscsi_device_reset,
+
+ .can_queue = 1024,
+ .dma_boundary = UINT_MAX,
+ .use_clustering = ENABLE_CLUSTERING,
+};
+
+#define virtscsi_config_get(vdev, fld) \
+ ({ \
+ typeof(((struct virtio_scsi_config *)0)->fld) __val; \
+ vdev->config->get(vdev, \
+ offsetof(struct virtio_scsi_config, fld), \
+ &__val, sizeof(__val)); \
+ __val; \
+ })
+
+#define virtscsi_config_set(vdev, fld, val) \
+ (void)({ \
+ typeof(((struct virtio_scsi_config *)0)->fld) __val = (val); \
+ vdev->config->set(vdev, \
+ offsetof(struct virtio_scsi_config, fld), \
+ &__val, sizeof(__val)); \
+ })
+
+static int virtscsi_init(struct virtio_device *vdev,
+ struct virtio_scsi *vscsi)
+{
+ int err;
+ struct virtqueue *vqs[3];
+ vq_callback_t *callbacks[] = {
+ virtscsi_ctrl_done,
+ virtscsi_event_done,
+ virtscsi_req_done
+ };
+ const char *names[] = {
+ "control",
+ "event",
+ "request"
+ };
+
+ /* Discover virtqueues and write information to configuration. */
+ err = vdev->config->find_vqs(vdev, 3, vqs, callbacks, names);
+ if (err)
+ return err;
+
+ vscsi->ctrl_vq = vqs[0];
+ vscsi->event_vq = vqs[1];
+ vscsi->req_vq = vqs[2];
+
+ virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE);
+ virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE);
+ return 0;
+}
+
+static int __devinit virtscsi_probe(struct virtio_device *vdev)
+{
+ struct Scsi_Host *shost;
+ struct virtio_scsi *vscsi;
+ int err;
+ u32 sg_elems;
+ u32 cmd_per_lun;
+
+ /* We need to know how many segments before we allocate.
+ * We need an extra sg elements at head and tail.
+ */
+ sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
+
+ /* Allocate memory and link the structs together. */
+ shost = scsi_host_alloc(&virtscsi_host_template,
+ sizeof(*vscsi) + sizeof(vscsi->sg[0]) * (sg_elems + 2));
+
+ if (!shost)
+ return -ENOMEM;
+
+ shost->sg_tablesize = sg_elems;
+ vscsi = shost_priv(shost);
+ vscsi->vdev = vdev;
+ vdev->priv = shost;
+
+ /* Random initializations. */
+ spin_lock_init(&vscsi->vq_lock);
+ sg_init_table(vscsi->sg, sg_elems + 2);
+
+ err = virtscsi_init(vdev, vscsi);
+ if (err)
+ goto virtscsi_init_failed;
+
+ cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1;
+ shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue);
+ shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF;
+ shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1;
+ shost->max_id = virtscsi_config_get(vdev, max_target) + 1;
+ shost->max_channel = 0;
+ shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE;
+ err = scsi_add_host(shost, &vdev->dev);
+ if (err)
+ goto scsi_add_host_failed;
+
+ scsi_scan_host(shost);
+
+ return 0;
+
+scsi_add_host_failed:
+ vdev->config->del_vqs(vdev);
+virtscsi_init_failed:
+ scsi_host_put(shost);
+ return err;
+}
+
+static void virtscsi_remove_vqs(struct virtio_device *vdev)
+{
+ /* Stop all the virtqueues. */
+ vdev->config->reset(vdev);
+
+ vdev->config->del_vqs(vdev);
+}
+
+static void __devexit virtscsi_remove(struct virtio_device *vdev)
+{
+ struct Scsi_Host *shost = virtio_scsi_host(vdev);
+
+ scsi_remove_host(shost);
+
+ virtscsi_remove_vqs(vdev);
+ scsi_host_put(shost);
+}
+
+#if 0
+static int virtscsi_freeze(struct virtio_device *vdev)
+{
+ virtscsi_remove_vqs(vdev);
+ return 0;
+}
+
+static int virtscsi_restore(struct virtio_device *vdev)
+{
+ struct Scsi_Host *sh = virtio_scsi_host(vdev);
+ struct virtio_scsi *vscsi = shost_priv(sh);
+
+ return virtscsi_init(vdev, vscsi);
+}
+#endif
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_SCSI, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static struct virtio_driver virtio_scsi_driver = {
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = virtscsi_probe,
+#if 0
+ .freeze = virtscsi_freeze,
+ .restore = virtscsi_restore,
+#endif
+ .remove = __devexit_p(virtscsi_remove),
+};
+
+static int __init init(void)
+{
+ int ret = -ENOMEM;
+
+ virtscsi_cmd_cache = KMEM_CACHE(virtio_scsi_cmd, 0);
+ if (!virtscsi_cmd_cache) {
+ printk(KERN_ERR "kmem_cache_create() for "
+ "virtscsi_cmd_cache failed\n");
+ goto error;
+ }
+
+
+ virtscsi_cmd_pool =
+ mempool_create_slab_pool(VIRTIO_SCSI_MEMPOOL_SZ,
+ virtscsi_cmd_cache);
+ if (!virtscsi_cmd_pool) {
+ printk(KERN_ERR "mempool_create() for"
+ "virtscsi_cmd_pool failed\n");
+ goto error;
+ }
+ ret = register_virtio_driver(&virtio_scsi_driver);
+ if (ret < 0)
+ goto error;
+
+ return 0;
+
+error:
+ if (virtscsi_cmd_pool) {
+ mempool_destroy(virtscsi_cmd_pool);
+ virtscsi_cmd_pool = NULL;
+ }
+ if (virtscsi_cmd_cache) {
+ kmem_cache_destroy(virtscsi_cmd_cache);
+ virtscsi_cmd_cache = NULL;
+ }
+ return ret;
+}
+
+static void __exit fini(void)
+{
+ unregister_virtio_driver(&virtio_scsi_driver);
+ mempool_destroy(virtscsi_cmd_pool);
+ kmem_cache_destroy(virtscsi_cmd_cache);
+}
+module_init(init);
+module_exit(fini);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio SCSI HBA driver");
+MODULE_LICENSE("GPL");
--- a/include/linux/virtio_ids.h
+++ b/include/linux/virtio_ids.h
@@ -34,6 +34,7 @@
#define VIRTIO_ID_CONSOLE 3 /* virtio console */
#define VIRTIO_ID_RNG 4 /* virtio ring */
#define VIRTIO_ID_BALLOON 5 /* virtio balloon */
+#define VIRTIO_ID_SCSI 8 /* virtio scsi */
#define VIRTIO_ID_9P 9 /* 9p virtio console */
#endif /* _LINUX_VIRTIO_IDS_H */
--- /dev/null
+++ b/include/linux/virtio_scsi.h
@@ -0,0 +1,114 @@
+#ifndef _LINUX_VIRTIO_SCSI_H
+#define _LINUX_VIRTIO_SCSI_H
+/* This header is BSD licensed so anyone can use the definitions to implement
+ * compatible drivers/servers. */
+
+#define VIRTIO_SCSI_CDB_SIZE 32
+#define VIRTIO_SCSI_SENSE_SIZE 96
+
+/* SCSI command request, followed by data-out */
+struct virtio_scsi_cmd_req {
+ u8 lun[8]; /* Logical Unit Number */
+ u64 tag; /* Command identifier */
+ u8 task_attr; /* Task attribute */
+ u8 prio;
+ u8 crn;
+ u8 cdb[VIRTIO_SCSI_CDB_SIZE];
+} __packed;
+
+/* Response, followed by sense data and data-in */
+struct virtio_scsi_cmd_resp {
+ u32 sense_len; /* Sense data length */
+ u32 resid; /* Residual bytes in data buffer */
+ u16 status_qualifier; /* Status qualifier */
+ u8 status; /* Command completion status */
+ u8 response; /* Response values */
+ u8 sense[VIRTIO_SCSI_SENSE_SIZE];
+} __packed;
+
+/* Task Management Request */
+struct virtio_scsi_ctrl_tmf_req {
+ u32 type;
+ u32 subtype;
+ u8 lun[8];
+ u64 tag;
+} __packed;
+
+struct virtio_scsi_ctrl_tmf_resp {
+ u8 response;
+} __packed;
+
+/* Asynchronous notification query/subscription */
+struct virtio_scsi_ctrl_an_req {
+ u32 type;
+ u8 lun[8];
+ u32 event_requested;
+} __packed;
+
+struct virtio_scsi_ctrl_an_resp {
+ u32 event_actual;
+ u8 response;
+} __packed;
+
+struct virtio_scsi_event {
+ u32 event;
+ u8 lun[8];
+ u32 reason;
+} __packed;
+
+struct virtio_scsi_config {
+ u32 num_queues;
+ u32 seg_max;
+ u32 max_sectors;
+ u32 cmd_per_lun;
+ u32 event_info_size;
+ u32 sense_size;
+ u32 cdb_size;
+ u16 max_channel;
+ u16 max_target;
+ u32 max_lun;
+} __packed;
+
+/* Response codes */
+#define VIRTIO_SCSI_S_OK 0
+#define VIRTIO_SCSI_S_OVERRUN 1
+#define VIRTIO_SCSI_S_ABORTED 2
+#define VIRTIO_SCSI_S_BAD_TARGET 3
+#define VIRTIO_SCSI_S_RESET 4
+#define VIRTIO_SCSI_S_BUSY 5
+#define VIRTIO_SCSI_S_TRANSPORT_FAILURE 6
+#define VIRTIO_SCSI_S_TARGET_FAILURE 7
+#define VIRTIO_SCSI_S_NEXUS_FAILURE 8
+#define VIRTIO_SCSI_S_FAILURE 9
+#define VIRTIO_SCSI_S_FUNCTION_SUCCEEDED 10
+#define VIRTIO_SCSI_S_FUNCTION_REJECTED 11
+#define VIRTIO_SCSI_S_INCORRECT_LUN 12
+
+/* Controlq type codes. */
+#define VIRTIO_SCSI_T_TMF 0
+#define VIRTIO_SCSI_T_AN_QUERY 1
+#define VIRTIO_SCSI_T_AN_SUBSCRIBE 2
+
+/* Valid TMF subtypes. */
+#define VIRTIO_SCSI_T_TMF_ABORT_TASK 0
+#define VIRTIO_SCSI_T_TMF_ABORT_TASK_SET 1
+#define VIRTIO_SCSI_T_TMF_CLEAR_ACA 2
+#define VIRTIO_SCSI_T_TMF_CLEAR_TASK_SET 3
+#define VIRTIO_SCSI_T_TMF_I_T_NEXUS_RESET 4
+#define VIRTIO_SCSI_T_TMF_LOGICAL_UNIT_RESET 5
+#define VIRTIO_SCSI_T_TMF_QUERY_TASK 6
+#define VIRTIO_SCSI_T_TMF_QUERY_TASK_SET 7
+
+/* Events. */
+#define VIRTIO_SCSI_T_EVENTS_MISSED 0x80000000
+#define VIRTIO_SCSI_T_NO_EVENT 0
+#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
+#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
+
+#define VIRTIO_SCSI_S_SIMPLE 0
+#define VIRTIO_SCSI_S_ORDERED 1
+#define VIRTIO_SCSI_S_HEAD 2
+#define VIRTIO_SCSI_S_ACA 3
+
+
+#endif /* _LINUX_VIRTIO_SCSI_H */

68
debian/patches/features/all/virtio_scsi/0002-SCSI-virtio_scsi-fix-TMF-use-after-free.patch vendored Normal file
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@ -0,0 +1,68 @@
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 4 May 2012 12:32:04 +0200
Subject: [02/12] [SCSI] virtio_scsi: fix TMF use-after-free
commit e4594bb50518eb89c447be97dabd5bd99f405d71 upstream.
Fix a use-after-free in the TMF path, where cmd may have been already
freed by virtscsi_complete_free when wait_for_completion restarts
executing virtscsi_tmf. Technically a race, but in practice the command
will always be freed long before the completion waiter is awoken.
The fix is to make callers specifying a completion responsible for
freeing the command in all cases.
Signed-off-by: Hu Tao <hutao@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---
drivers/scsi/virtio_scsi.c | 24 +++++++++++++-----------
1 file changed, 13 insertions(+), 11 deletions(-)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index efccd72..1b38431 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -175,7 +175,8 @@ static void virtscsi_complete_free(void *buf)
if (cmd->comp)
complete_all(cmd->comp);
- mempool_free(cmd, virtscsi_cmd_pool);
+ else
+ mempool_free(cmd, virtscsi_cmd_pool);
}
static void virtscsi_ctrl_done(struct virtqueue *vq)
@@ -311,21 +312,22 @@ out:
static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd)
{
DECLARE_COMPLETION_ONSTACK(comp);
- int ret;
+ int ret = FAILED;
cmd->comp = &comp;
- ret = virtscsi_kick_cmd(vscsi, vscsi->ctrl_vq, cmd,
- sizeof cmd->req.tmf, sizeof cmd->resp.tmf,
- GFP_NOIO);
- if (ret < 0)
- return FAILED;
+ if (virtscsi_kick_cmd(vscsi, vscsi->ctrl_vq, cmd,
+ sizeof cmd->req.tmf, sizeof cmd->resp.tmf,
+ GFP_NOIO) < 0)
+ goto out;
wait_for_completion(&comp);
- if (cmd->resp.tmf.response != VIRTIO_SCSI_S_OK &&
- cmd->resp.tmf.response != VIRTIO_SCSI_S_FUNCTION_SUCCEEDED)
- return FAILED;
+ if (cmd->resp.tmf.response == VIRTIO_SCSI_S_OK ||
+ cmd->resp.tmf.response == VIRTIO_SCSI_S_FUNCTION_SUCCEEDED)
+ ret = SUCCESS;
- return SUCCESS;
+out:
+ mempool_free(cmd, virtscsi_cmd_pool);
+ return ret;
}
static int virtscsi_device_reset(struct scsi_cmnd *sc)

30
debian/patches/features/all/virtio_scsi/0003-SCSI-virtio-scsi-unlock-during-kick.patch vendored Normal file
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@ -0,0 +1,30 @@
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 13 Jun 2012 16:56:31 +0200
Subject: [03/12] [SCSI] virtio-scsi: unlock during kick
commit b5ee8f2802c559fccb177c0a117f5cd56c1049cc upstream.
Separate virtqueue_kick_prepare from virtqueue_notify, so that the
expensive vmexit is done without holding the lock.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---
drivers/scsi/virtio_scsi.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -264,9 +264,11 @@ static int virtscsi_kick_cmd(struct virt
ret = virtqueue_add_buf_gfp(vq, vscsi->sg, out_num, in_num, cmd, gfp);
if (ret >= 0)
- virtqueue_kick(vq);
+ ret = virtqueue_kick_prepare(vq);
spin_unlock_irqrestore(&vscsi->vq_lock, flags);
+ if (ret > 0)
+ virtqueue_notify(vq);
return ret;
}

195
debian/patches/features/all/virtio_scsi/0004-SCSI-virtio-scsi-split-locking-per-vq.patch vendored Normal file
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@ -0,0 +1,195 @@
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 13 Jun 2012 16:56:32 +0200
Subject: [04/12] [SCSI] virtio-scsi: split locking per vq
commit 139fe45abc2234b20fd5ecbcb7ea6d3688fed5e5 upstream.
Keep a separate lock for each virtqueue. While not particularly
important now, it prepares the code for when we will add support
for multiple request queues. It is also more tidy as soon as
we introduce a separate lock for the sglist.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2: s/virtqueue_add_buf/&_gfp/]
---
drivers/scsi/virtio_scsi.c | 77 ++++++++++++++++++++++++++++++--------------
1 file changed, 52 insertions(+), 25 deletions(-)
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -43,15 +43,22 @@ struct virtio_scsi_cmd {
} resp;
} ____cacheline_aligned_in_smp;
+struct virtio_scsi_vq {
+ /* Protects vq */
+ spinlock_t vq_lock;
+
+ struct virtqueue *vq;
+};
+
/* Driver instance state */
struct virtio_scsi {
- /* Protects ctrl_vq, req_vq and sg[] */
- spinlock_t vq_lock;
+ /* Protects sg[]. The lock hierarchy is sg_lock -> vq_lock. */
+ spinlock_t sg_lock;
struct virtio_device *vdev;
- struct virtqueue *ctrl_vq;
- struct virtqueue *event_vq;
- struct virtqueue *req_vq;
+ struct virtio_scsi_vq ctrl_vq;
+ struct virtio_scsi_vq event_vq;
+ struct virtio_scsi_vq req_vq;
/* For sglist construction when adding commands to the virtqueue. */
struct scatterlist sg[];
@@ -147,26 +154,25 @@ static void virtscsi_complete_cmd(void *
static void virtscsi_vq_done(struct virtqueue *vq, void (*fn)(void *buf))
{
- struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
- struct virtio_scsi *vscsi = shost_priv(sh);
void *buf;
- unsigned long flags;
unsigned int len;
- spin_lock_irqsave(&vscsi->vq_lock, flags);
-
do {
virtqueue_disable_cb(vq);
while ((buf = virtqueue_get_buf(vq, &len)) != NULL)
fn(buf);
} while (!virtqueue_enable_cb(vq));
-
- spin_unlock_irqrestore(&vscsi->vq_lock, flags);
}
static void virtscsi_req_done(struct virtqueue *vq)
{
+ struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
+ struct virtio_scsi *vscsi = shost_priv(sh);
+ unsigned long flags;
+
+ spin_lock_irqsave(&vscsi->req_vq.vq_lock, flags);
virtscsi_vq_done(vq, virtscsi_complete_cmd);
+ spin_unlock_irqrestore(&vscsi->req_vq.vq_lock, flags);
};
static void virtscsi_complete_free(void *buf)
@@ -181,12 +187,24 @@ static void virtscsi_complete_free(void
static void virtscsi_ctrl_done(struct virtqueue *vq)
{
+ struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
+ struct virtio_scsi *vscsi = shost_priv(sh);
+ unsigned long flags;
+
+ spin_lock_irqsave(&vscsi->ctrl_vq.vq_lock, flags);
virtscsi_vq_done(vq, virtscsi_complete_free);
+ spin_unlock_irqrestore(&vscsi->ctrl_vq.vq_lock, flags);
};
static void virtscsi_event_done(struct virtqueue *vq)
{
+ struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
+ struct virtio_scsi *vscsi = shost_priv(sh);
+ unsigned long flags;
+
+ spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);
virtscsi_vq_done(vq, virtscsi_complete_free);
+ spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags);
};
static void virtscsi_map_sgl(struct scatterlist *sg, unsigned int *p_idx,
@@ -250,7 +268,7 @@ static void virtscsi_map_cmd(struct virt
*in_num = idx - *out_num;
}
-static int virtscsi_kick_cmd(struct virtio_scsi *vscsi, struct virtqueue *vq,
+static int virtscsi_kick_cmd(struct virtio_scsi *vscsi, struct virtio_scsi_vq *vq,
struct virtio_scsi_cmd *cmd,
size_t req_size, size_t resp_size, gfp_t gfp)
{
@@ -258,17 +276,19 @@ static int virtscsi_kick_cmd(struct virt
unsigned long flags;
int ret;
- spin_lock_irqsave(&vscsi->vq_lock, flags);
-
+ spin_lock_irqsave(&vscsi->sg_lock, flags);
virtscsi_map_cmd(vscsi, cmd, &out_num, &in_num, req_size, resp_size);
- ret = virtqueue_add_buf_gfp(vq, vscsi->sg, out_num, in_num, cmd, gfp);
+ spin_lock(&vq->vq_lock);
+ ret = virtqueue_add_buf_gfp(vq->vq, vscsi->sg, out_num, in_num, cmd, gfp);
if (ret >= 0)
- ret = virtqueue_kick_prepare(vq);
+ ret = virtqueue_kick_prepare(vq->vq);
+
+ spin_unlock(&vq->vq_lock);
+ spin_unlock_irqrestore(&vscsi->sg_lock, flags);
- spin_unlock_irqrestore(&vscsi->vq_lock, flags);
if (ret > 0)
- virtqueue_notify(vq);
+ virtqueue_notify(vq->vq);
return ret;
}
@@ -302,7 +322,7 @@ static int virtscsi_queuecommand(struct
BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);
memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
- if (virtscsi_kick_cmd(vscsi, vscsi->req_vq, cmd,
+ if (virtscsi_kick_cmd(vscsi, &vscsi->req_vq, cmd,
sizeof cmd->req.cmd, sizeof cmd->resp.cmd,
GFP_ATOMIC) >= 0)
ret = 0;
@@ -317,7 +337,7 @@ static int virtscsi_tmf(struct virtio_sc
int ret = FAILED;
cmd->comp = &comp;
- if (virtscsi_kick_cmd(vscsi, vscsi->ctrl_vq, cmd,
+ if (virtscsi_kick_cmd(vscsi, &vscsi->ctrl_vq, cmd,
sizeof cmd->req.tmf, sizeof cmd->resp.tmf,
GFP_NOIO) < 0)
goto out;
@@ -410,6 +430,13 @@ static struct scsi_host_template virtscs
&__val, sizeof(__val)); \
})
+static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq,
+ struct virtqueue *vq)
+{
+ spin_lock_init(&virtscsi_vq->vq_lock);
+ virtscsi_vq->vq = vq;
+}
+
static int virtscsi_init(struct virtio_device *vdev,
struct virtio_scsi *vscsi)
{
@@ -431,9 +458,9 @@ static int virtscsi_init(struct virtio_d
if (err)
return err;
- vscsi->ctrl_vq = vqs[0];
- vscsi->event_vq = vqs[1];
- vscsi->req_vq = vqs[2];
+ virtscsi_init_vq(&vscsi->ctrl_vq, vqs[0]);
+ virtscsi_init_vq(&vscsi->event_vq, vqs[1]);
+ virtscsi_init_vq(&vscsi->req_vq, vqs[2]);
virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE);
virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE);
@@ -466,7 +493,7 @@ static int __devinit virtscsi_probe(stru
vdev->priv = shost;
/* Random initializations. */
- spin_lock_init(&vscsi->vq_lock);
+ spin_lock_init(&vscsi->sg_lock);
sg_init_table(vscsi->sg, sg_elems + 2);
err = virtscsi_init(vdev, vscsi);

49
debian/patches/features/all/virtio_scsi/0005-SCSI-virtio-scsi-release-sg_lock-after-add_buf.patch vendored Normal file
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@ -0,0 +1,49 @@
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 13 Jun 2012 16:56:33 +0200
Subject: [05/12] [SCSI] virtio-scsi: release sg_lock after add_buf
commit bce750b1633927be3eecf821f4d17975c3ba5b6a upstream.
We do not need the sglist after calling virtqueue_add_buf. Hence we
can "pipeline" the locked operations and start preparing the sglist
for the next request while we kick the virtqueue.
Together with the previous two patches, this improves performance as
follows. For a simple "if=/dev/sda of=/dev/null bs=128M iflag=direct"
(the source being a 10G disk, residing entirely in the host buffer cache),
the additional locking does not cause any penalty with only one dd
process, but 2 simultaneous I/O operations improve their times by 3%:
number of simultaneous dd
1 2
----------------------------------------
current 5.9958s 10.2640s
patched 5.9531s 9.8663s
(Times are best of 10).
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2: adjust context]
---
drivers/scsi/virtio_scsi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 0ecf95e..facfc90 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -281,11 +281,11 @@ static int virtscsi_kick_cmd(struct virtio_scsi *vscsi, struct virtio_scsi_vq *v
spin_lock(&vq->vq_lock);
ret = virtqueue_add_buf_gfp(vq->vq, vscsi->sg, out_num, in_num, cmd, gfp);
+ spin_unlock(&vscsi->sg_lock);
if (ret >= 0)
ret = virtqueue_kick_prepare(vq->vq);
- spin_unlock(&vq->vq_lock);
- spin_unlock_irqrestore(&vscsi->sg_lock, flags);
+ spin_unlock_irqrestore(&vq->vq_lock, flags);
if (ret > 0)
virtqueue_notify(vq->vq);

290
debian/patches/features/all/virtio_scsi/0006-SCSI-virtio-scsi-split-scatterlist-per-target.patch vendored Normal file
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@ -0,0 +1,290 @@
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Wed, 13 Jun 2012 16:56:34 +0200
Subject: [06/12] [SCSI] virtio-scsi: split scatterlist per target
commit 2bd37f0fde99cbf8b78fb55f1128e8c3a63cf1da upstream.
To improve performance for I/O to different targets, add a separate
scatterlist for each of them.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2: s/virtqueue_add_buf/&_gfp/]
---
drivers/scsi/virtio_scsi.c | 141 +++++++++++++++++++++++++++++---------------
1 file changed, 94 insertions(+), 47 deletions(-)
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -50,18 +50,24 @@ struct virtio_scsi_vq {
struct virtqueue *vq;
};
+/* Per-target queue state */
+struct virtio_scsi_target_state {
+ /* Protects sg. Lock hierarchy is tgt_lock -> vq_lock. */
+ spinlock_t tgt_lock;
+
+ /* For sglist construction when adding commands to the virtqueue. */
+ struct scatterlist sg[];
+};
+
/* Driver instance state */
struct virtio_scsi {
- /* Protects sg[]. The lock hierarchy is sg_lock -> vq_lock. */
- spinlock_t sg_lock;
-
struct virtio_device *vdev;
+
struct virtio_scsi_vq ctrl_vq;
struct virtio_scsi_vq event_vq;
struct virtio_scsi_vq req_vq;
- /* For sglist construction when adding commands to the virtqueue. */
- struct scatterlist sg[];
+ struct virtio_scsi_target_state *tgt[];
};
static struct kmem_cache *virtscsi_cmd_cache;
@@ -230,25 +236,17 @@ static void virtscsi_map_sgl(struct scat
* @req_size : size of the request buffer
* @resp_size : size of the response buffer
*
- * Called with vq_lock held.
+ * Called with tgt_lock held.
*/
-static void virtscsi_map_cmd(struct virtio_scsi *vscsi,
+static void virtscsi_map_cmd(struct virtio_scsi_target_state *tgt,
struct virtio_scsi_cmd *cmd,
unsigned *out_num, unsigned *in_num,
size_t req_size, size_t resp_size)
{
struct scsi_cmnd *sc = cmd->sc;
- struct scatterlist *sg = vscsi->sg;
+ struct scatterlist *sg = tgt->sg;
unsigned int idx = 0;
- if (sc) {
- struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
- BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize);
-
- /* TODO: check feature bit and fail if unsupported? */
- BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL);
- }
-
/* Request header. */
sg_set_buf(&sg[idx++], &cmd->req, req_size);
@@ -268,7 +266,8 @@ static void virtscsi_map_cmd(struct virt
*in_num = idx - *out_num;
}
-static int virtscsi_kick_cmd(struct virtio_scsi *vscsi, struct virtio_scsi_vq *vq,
+static int virtscsi_kick_cmd(struct virtio_scsi_target_state *tgt,
+ struct virtio_scsi_vq *vq,
struct virtio_scsi_cmd *cmd,
size_t req_size, size_t resp_size, gfp_t gfp)
{
@@ -276,12 +275,12 @@ static int virtscsi_kick_cmd(struct virt
unsigned long flags;
int ret;
- spin_lock_irqsave(&vscsi->sg_lock, flags);
- virtscsi_map_cmd(vscsi, cmd, &out_num, &in_num, req_size, resp_size);
+ spin_lock_irqsave(&tgt->tgt_lock, flags);
+ virtscsi_map_cmd(tgt, cmd, &out_num, &in_num, req_size, resp_size);
spin_lock(&vq->vq_lock);
- ret = virtqueue_add_buf_gfp(vq->vq, vscsi->sg, out_num, in_num, cmd, gfp);
- spin_unlock(&vscsi->sg_lock);
+ ret = virtqueue_add_buf_gfp(vq->vq, tgt->sg, out_num, in_num, cmd, gfp);
+ spin_unlock(&tgt->tgt_lock);
if (ret >= 0)
ret = virtqueue_kick_prepare(vq->vq);
@@ -295,9 +294,16 @@ static int virtscsi_kick_cmd(struct virt
static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
{
struct virtio_scsi *vscsi = shost_priv(sh);
+ struct virtio_scsi_target_state *tgt = vscsi->tgt[sc->device->id];
struct virtio_scsi_cmd *cmd;
int ret;
+ struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
+ BUG_ON(scsi_sg_count(sc) > shost->sg_tablesize);
+
+ /* TODO: check feature bit and fail if unsupported? */
+ BUG_ON(sc->sc_data_direction == DMA_BIDIRECTIONAL);
+
dev_dbg(&sc->device->sdev_gendev,
"cmd %p CDB: %#02x\n", sc, sc->cmnd[0]);
@@ -322,7 +328,7 @@ static int virtscsi_queuecommand(struct
BUG_ON(sc->cmd_len > VIRTIO_SCSI_CDB_SIZE);
memcpy(cmd->req.cmd.cdb, sc->cmnd, sc->cmd_len);
- if (virtscsi_kick_cmd(vscsi, &vscsi->req_vq, cmd,
+ if (virtscsi_kick_cmd(tgt, &vscsi->req_vq, cmd,
sizeof cmd->req.cmd, sizeof cmd->resp.cmd,
GFP_ATOMIC) >= 0)
ret = 0;
@@ -334,10 +340,11 @@ out:
static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd)
{
DECLARE_COMPLETION_ONSTACK(comp);
+ struct virtio_scsi_target_state *tgt = vscsi->tgt[cmd->sc->device->id];
int ret = FAILED;
cmd->comp = &comp;
- if (virtscsi_kick_cmd(vscsi, &vscsi->ctrl_vq, cmd,
+ if (virtscsi_kick_cmd(tgt, &vscsi->ctrl_vq, cmd,
sizeof cmd->req.tmf, sizeof cmd->resp.tmf,
GFP_NOIO) < 0)
goto out;
@@ -437,11 +444,49 @@ static void virtscsi_init_vq(struct virt
virtscsi_vq->vq = vq;
}
+static struct virtio_scsi_target_state *virtscsi_alloc_tgt(
+ struct virtio_device *vdev, int sg_elems)
+{
+ struct virtio_scsi_target_state *tgt;
+ gfp_t gfp_mask = GFP_KERNEL;
+
+ /* We need extra sg elements at head and tail. */
+ tgt = kmalloc(sizeof(*tgt) + sizeof(tgt->sg[0]) * (sg_elems + 2),
+ gfp_mask);
+
+ if (!tgt)
+ return NULL;
+
+ spin_lock_init(&tgt->tgt_lock);
+ sg_init_table(tgt->sg, sg_elems + 2);
+ return tgt;
+}
+
+static void virtscsi_remove_vqs(struct virtio_device *vdev)
+{
+ struct Scsi_Host *sh = virtio_scsi_host(vdev);
+ struct virtio_scsi *vscsi = shost_priv(sh);
+ u32 i, num_targets;
+
+ /* Stop all the virtqueues. */
+ vdev->config->reset(vdev);
+
+ num_targets = sh->max_id;
+ for (i = 0; i < num_targets; i++) {
+ kfree(vscsi->tgt[i]);
+ vscsi->tgt[i] = NULL;
+ }
+
+ vdev->config->del_vqs(vdev);
+}
+
static int virtscsi_init(struct virtio_device *vdev,
- struct virtio_scsi *vscsi)
+ struct virtio_scsi *vscsi, int num_targets)
{
int err;
struct virtqueue *vqs[3];
+ u32 i, sg_elems;
+
vq_callback_t *callbacks[] = {
virtscsi_ctrl_done,
virtscsi_event_done,
@@ -464,7 +509,23 @@ static int virtscsi_init(struct virtio_d
virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE);
virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE);
- return 0;
+
+ /* We need to know how many segments before we allocate. */
+ sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
+
+ for (i = 0; i < num_targets; i++) {
+ vscsi->tgt[i] = virtscsi_alloc_tgt(vdev, sg_elems);
+ if (!vscsi->tgt[i]) {
+ err = -ENOMEM;
+ goto out;
+ }
+ }
+ err = 0;
+
+out:
+ if (err)
+ virtscsi_remove_vqs(vdev);
+ return err;
}
static int __devinit virtscsi_probe(struct virtio_device *vdev)
@@ -472,31 +533,25 @@ static int __devinit virtscsi_probe(stru
struct Scsi_Host *shost;
struct virtio_scsi *vscsi;
int err;
- u32 sg_elems;
+ u32 sg_elems, num_targets;
u32 cmd_per_lun;
- /* We need to know how many segments before we allocate.
- * We need an extra sg elements at head and tail.
- */
- sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
-
/* Allocate memory and link the structs together. */
+ num_targets = virtscsi_config_get(vdev, max_target) + 1;
shost = scsi_host_alloc(&virtscsi_host_template,
- sizeof(*vscsi) + sizeof(vscsi->sg[0]) * (sg_elems + 2));
+ sizeof(*vscsi)
+ + num_targets * sizeof(struct virtio_scsi_target_state));
if (!shost)
return -ENOMEM;
+ sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
shost->sg_tablesize = sg_elems;
vscsi = shost_priv(shost);
vscsi->vdev = vdev;
vdev->priv = shost;
- /* Random initializations. */
- spin_lock_init(&vscsi->sg_lock);
- sg_init_table(vscsi->sg, sg_elems + 2);
-
- err = virtscsi_init(vdev, vscsi);
+ err = virtscsi_init(vdev, vscsi, num_targets);
if (err)
goto virtscsi_init_failed;
@@ -504,7 +559,7 @@ static int __devinit virtscsi_probe(stru
shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue);
shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF;
shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1;
- shost->max_id = virtscsi_config_get(vdev, max_target) + 1;
+ shost->max_id = num_targets;
shost->max_channel = 0;
shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE;
err = scsi_add_host(shost, &vdev->dev);
@@ -522,14 +577,6 @@ virtscsi_init_failed:
return err;
}
-static void virtscsi_remove_vqs(struct virtio_device *vdev)
-{
- /* Stop all the virtqueues. */
- vdev->config->reset(vdev);
-
- vdev->config->del_vqs(vdev);
-}
-
static void __devexit virtscsi_remove(struct virtio_device *vdev)
{
struct Scsi_Host *shost = virtio_scsi_host(vdev);
@@ -552,7 +599,7 @@ static int virtscsi_restore(struct virti
struct Scsi_Host *sh = virtio_scsi_host(vdev);
struct virtio_scsi *vscsi = shost_priv(sh);
- return virtscsi_init(vdev, vscsi);
+ return virtscsi_init(vdev, vscsi, sh->max_id);
}
#endif

229
debian/patches/features/all/virtio_scsi/0007-SCSI-virtio-scsi-hotplug-support-for-virtio-scsi.patch vendored Normal file
View File

@ -0,0 +1,229 @@
From: Cong Meng <mc@linux.vnet.ibm.com>
Date: Thu, 5 Jul 2012 17:06:43 +0800
Subject: [07/12] [SCSI] virtio-scsi: hotplug support for virtio-scsi
commit 365a7150094114a0f8ef0b6164e6b04b519039e8 upstream.
This patch implements the hotplug support for virtio-scsi.
When there is a device attached/detached, the virtio-scsi driver will be
signaled via event virtual queue and it will add/remove the scsi device
in question automatically.
Signed-off-by: Sen Wang <senwang@linux.vnet.ibm.com>
Signed-off-by: Cong Meng <mc@linux.vnet.ibm.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2: s/virtqueue_add_buf/&_gfp/]
---
drivers/scsi/virtio_scsi.c | 124 ++++++++++++++++++++++++++++++++++++++++++-
include/linux/virtio_scsi.h | 9 ++++
2 files changed, 132 insertions(+), 1 deletion(-)
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -25,6 +25,7 @@
#include <scsi/scsi_cmnd.h>
#define VIRTIO_SCSI_MEMPOOL_SZ 64
+#define VIRTIO_SCSI_EVENT_LEN 8
/* Command queue element */
struct virtio_scsi_cmd {
@@ -43,6 +44,12 @@ struct virtio_scsi_cmd {
} resp;
} ____cacheline_aligned_in_smp;
+struct virtio_scsi_event_node {
+ struct virtio_scsi *vscsi;
+ struct virtio_scsi_event event;
+ struct work_struct work;
+};
+
struct virtio_scsi_vq {
/* Protects vq */
spinlock_t vq_lock;
@@ -67,6 +74,9 @@ struct virtio_scsi {
struct virtio_scsi_vq event_vq;
struct virtio_scsi_vq req_vq;
+ /* Get some buffers ready for event vq */
+ struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN];
+
struct virtio_scsi_target_state *tgt[];
};
@@ -202,6 +212,105 @@ static void virtscsi_ctrl_done(struct vi
spin_unlock_irqrestore(&vscsi->ctrl_vq.vq_lock, flags);
};
+static int virtscsi_kick_event(struct virtio_scsi *vscsi,
+ struct virtio_scsi_event_node *event_node)
+{
+ int ret;
+ struct scatterlist sg;
+ unsigned long flags;
+
+ sg_set_buf(&sg, &event_node->event, sizeof(struct virtio_scsi_event));
+
+ spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);
+
+ ret = virtqueue_add_buf_gfp(vscsi->event_vq.vq, &sg, 0, 1, event_node, GFP_ATOMIC);
+ if (ret >= 0)
+ virtqueue_kick(vscsi->event_vq.vq);
+
+ spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags);
+
+ return ret;
+}
+
+static int virtscsi_kick_event_all(struct virtio_scsi *vscsi)
+{
+ int i;
+
+ for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++) {
+ vscsi->event_list[i].vscsi = vscsi;
+ virtscsi_kick_event(vscsi, &vscsi->event_list[i]);
+ }
+
+ return 0;
+}
+
+static void virtscsi_cancel_event_work(struct virtio_scsi *vscsi)
+{
+ int i;
+
+ for (i = 0; i < VIRTIO_SCSI_EVENT_LEN; i++)
+ cancel_work_sync(&vscsi->event_list[i].work);
+}
+
+static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi,
+ struct virtio_scsi_event *event)
+{
+ struct scsi_device *sdev;
+ struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
+ unsigned int target = event->lun[1];
+ unsigned int lun = (event->lun[2] << 8) | event->lun[3];
+
+ switch (event->reason) {
+ case VIRTIO_SCSI_EVT_RESET_RESCAN:
+ scsi_add_device(shost, 0, target, lun);
+ break;
+ case VIRTIO_SCSI_EVT_RESET_REMOVED:
+ sdev = scsi_device_lookup(shost, 0, target, lun);
+ if (sdev) {
+ scsi_remove_device(sdev);
+ scsi_device_put(sdev);
+ } else {
+ pr_err("SCSI device %d 0 %d %d not found\n",
+ shost->host_no, target, lun);
+ }
+ break;
+ default:
+ pr_info("Unsupport virtio scsi event reason %x\n", event->reason);
+ }
+}
+
+static void virtscsi_handle_event(struct work_struct *work)
+{
+ struct virtio_scsi_event_node *event_node =
+ container_of(work, struct virtio_scsi_event_node, work);
+ struct virtio_scsi *vscsi = event_node->vscsi;
+ struct virtio_scsi_event *event = &event_node->event;
+
+ if (event->event & VIRTIO_SCSI_T_EVENTS_MISSED) {
+ event->event &= ~VIRTIO_SCSI_T_EVENTS_MISSED;
+ scsi_scan_host(virtio_scsi_host(vscsi->vdev));
+ }
+
+ switch (event->event) {
+ case VIRTIO_SCSI_T_NO_EVENT:
+ break;
+ case VIRTIO_SCSI_T_TRANSPORT_RESET:
+ virtscsi_handle_transport_reset(vscsi, event);
+ break;
+ default:
+ pr_err("Unsupport virtio scsi event %x\n", event->event);
+ }
+ virtscsi_kick_event(vscsi, event_node);
+}
+
+static void virtscsi_complete_event(void *buf)
+{
+ struct virtio_scsi_event_node *event_node = buf;
+
+ INIT_WORK(&event_node->work, virtscsi_handle_event);
+ schedule_work(&event_node->work);
+}
+
static void virtscsi_event_done(struct virtqueue *vq)
{
struct Scsi_Host *sh = virtio_scsi_host(vq->vdev);
@@ -209,7 +318,7 @@ static void virtscsi_event_done(struct v
unsigned long flags;
spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);
- virtscsi_vq_done(vq, virtscsi_complete_free);
+ virtscsi_vq_done(vq, virtscsi_complete_event);
spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags);
};
@@ -510,6 +619,9 @@ static int virtscsi_init(struct virtio_d
virtscsi_config_set(vdev, cdb_size, VIRTIO_SCSI_CDB_SIZE);
virtscsi_config_set(vdev, sense_size, VIRTIO_SCSI_SENSE_SIZE);
+ if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
+ virtscsi_kick_event_all(vscsi);
+
/* We need to know how many segments before we allocate. */
sg_elems = virtscsi_config_get(vdev, seg_max) ?: 1;
@@ -580,6 +692,10 @@ virtscsi_init_failed:
static void __devexit virtscsi_remove(struct virtio_device *vdev)
{
struct Scsi_Host *shost = virtio_scsi_host(vdev);
+ struct virtio_scsi *vscsi = shost_priv(shost);
+
+ if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
+ virtscsi_cancel_event_work(vscsi);
scsi_remove_host(shost);
@@ -608,7 +724,13 @@ static struct virtio_device_id id_table[
{ 0 },
};
+static unsigned int features[] = {
+ VIRTIO_SCSI_F_HOTPLUG
+};
+
static struct virtio_driver virtio_scsi_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.id_table = id_table,
--- a/include/linux/virtio_scsi.h
+++ b/include/linux/virtio_scsi.h
@@ -69,6 +69,10 @@ struct virtio_scsi_config {
u32 max_lun;
} __packed;
+/* Feature Bits */
+#define VIRTIO_SCSI_F_INOUT 0
+#define VIRTIO_SCSI_F_HOTPLUG 1
+
/* Response codes */
#define VIRTIO_SCSI_S_OK 0
#define VIRTIO_SCSI_S_OVERRUN 1
@@ -105,6 +109,11 @@ struct virtio_scsi_config {
#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
+/* Reasons of transport reset event */
+#define VIRTIO_SCSI_EVT_RESET_HARD 0
+#define VIRTIO_SCSI_EVT_RESET_RESCAN 1
+#define VIRTIO_SCSI_EVT_RESET_REMOVED 2
+
#define VIRTIO_SCSI_S_SIMPLE 0
#define VIRTIO_SCSI_S_ORDERED 1
#define VIRTIO_SCSI_S_HEAD 2

92
debian/patches/features/all/virtio_scsi/0008-SCSI-virtio-scsi-Add-vdrv-scan-for-post-VIRTIO_CONFI.patch vendored Normal file
View File

@ -0,0 +1,92 @@
From: Nicholas Bellinger <nab@linux-iscsi.org>
Date: Wed, 11 Jul 2012 21:22:16 +0000
Subject: [08/12] [SCSI] virtio-scsi: Add vdrv->scan for post
VIRTIO_CONFIG_S_DRIVER_OK LUN scanning
commit 59057fbc37178f10a196ab7ec170b80273f75a47 upstream.
This patch changes virtio-scsi to use a new virtio_driver->scan() callback
so that scsi_scan_host() can be properly invoked once virtio_dev_probe() has
set add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK) to signal active virtio-ring
operation, instead of from within virtscsi_probe().
This fixes a bug where SCSI LUN scanning for both virtio-scsi-raw and
virtio-scsi/tcm_vhost setups was happening before VIRTIO_CONFIG_S_DRIVER_OK
had been set, causing VIRTIO_SCSI_S_BAD_TARGET to occur. This fixes a bug
with virtio-scsi/tcm_vhost where LUN scan was not detecting LUNs.
Tested with virtio-scsi-raw + virtio-scsi/tcm_vhost w/ IBLOCK on 3.5-rc2 code.
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
[bwh: Backported to 3.2: adjust context]
---
drivers/scsi/virtio_scsi.c | 15 ++++++++++++---
drivers/virtio/virtio.c | 5 ++++-
include/linux/virtio.h | 1 +
3 files changed, 17 insertions(+), 4 deletions(-)
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -571,6 +571,13 @@ static struct virtio_scsi_target_state *
return tgt;
}
+static void virtscsi_scan(struct virtio_device *vdev)
+{
+ struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv;
+
+ scsi_scan_host(shost);
+}
+
static void virtscsi_remove_vqs(struct virtio_device *vdev)
{
struct Scsi_Host *sh = virtio_scsi_host(vdev);
@@ -677,9 +684,10 @@ static int __devinit virtscsi_probe(stru
err = scsi_add_host(shost, &vdev->dev);
if (err)
goto scsi_add_host_failed;
-
- scsi_scan_host(shost);
-
+ /*
+ * scsi_scan_host() happens in virtscsi_scan() via virtio_driver->scan()
+ * after VIRTIO_CONFIG_S_DRIVER_OK has been set..
+ */
return 0;
scsi_add_host_failed:
@@ -735,6 +743,7 @@ static struct virtio_driver virtio_scsi_
.driver.owner = THIS_MODULE,
.id_table = id_table,
.probe = virtscsi_probe,
+ .scan = virtscsi_scan,
#if 0
.freeze = virtscsi_freeze,
.restore = virtscsi_restore,
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -140,8 +140,11 @@ static int virtio_dev_probe(struct devic
err = drv->probe(dev);
if (err)
add_status(dev, VIRTIO_CONFIG_S_FAILED);
- else
+ else {
add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK);
+ if (drv->scan)
+ drv->scan(dev);
+ }
return err;
}
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -148,6 +148,7 @@ struct virtio_driver {
const unsigned int *feature_table;
unsigned int feature_table_size;
int (*probe)(struct virtio_device *dev);
+ void (*scan)(struct virtio_device *dev);
void (*remove)(struct virtio_device *dev);
void (*config_changed)(struct virtio_device *dev);
};

54
debian/patches/features/all/virtio_scsi/0009-SCSI-scsi-virtio-scsi-Fix-address-translation-failur.patch vendored Normal file
View File

@ -0,0 +1,54 @@
From: Wang Sen <senwang@linux.vnet.ibm.com>
Date: Mon, 30 Jul 2012 14:25:06 +0800
Subject: [09/12] [SCSI] scsi: virtio-scsi: Fix address translation failure of
HighMem pages used by sg list
commit 27e99ade81368e6fdda3212bff9345177cf9e57a upstream.
When using the commands below to write some data to a virtio-scsi LUN of the
QEMU guest(32-bit) with 1G physical memory(qemu -m 1024), the qemu will crash.
# sudo mkfs.ext4 /dev/sdb (/dev/sdb is the virtio-scsi LUN.)
# sudo mount /dev/sdb /mnt
# dd if=/dev/zero of=/mnt/file bs=1M count=1024
In current implementation, sg_set_buf is called to add buffers to sg list which
is put into the virtqueue eventually. But if there are some HighMem pages in
table->sgl you can not get virtual address by sg_virt. So, sg_virt(sg_elem) may
return NULL value. This will cause QEMU exit when virtqueue_map_sg is called
in QEMU because an invalid GPA is passed by virtqueue.
Two solutions are discussed here:
http://lkml.indiana.edu/hypermail/linux/kernel/1207.3/00675.html
Finally, value assignment approach was adopted because:
Value assignment creates a well-formed scatterlist, because the termination
marker in source sg_list has been set in blk_rq_map_sg(). The last entry of the
source sg_list is just copied to the the last entry in destination list. Note
that, for now, virtio_ring does not care about the form of the scatterlist and
simply processes the first out_num + in_num consecutive elements of the sg[]
array.
I have tested the patch on my workstation. QEMU would not crash any more.
Signed-off-by: Wang Sen <senwang@linux.vnet.ibm.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---
drivers/scsi/virtio_scsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index c7030fb..3e79a2f 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -331,7 +331,7 @@ static void virtscsi_map_sgl(struct scatterlist *sg, unsigned int *p_idx,
int i;
for_each_sg(table->sgl, sg_elem, table->nents, i)
- sg_set_buf(&sg[idx++], sg_virt(sg_elem), sg_elem->length);
+ sg[idx++] = *sg_elem;
*p_idx = idx;
}

29
debian/patches/features/all/virtio_scsi/0010-SCSI-virtio-scsi-initialize-scatterlist-structure.patch vendored Normal file
View File

@ -0,0 +1,29 @@
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Tue, 2 Oct 2012 17:25:46 +0200
Subject: [10/12] [SCSI] virtio-scsi: initialize scatterlist structure
commit 2e9c9dfde00a6466441e93033cf2c37f720bdacf upstream.
The sg struct is used without being initialized, which breaks
when CONFIG_DEBUG_SG is enabled.
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---
drivers/scsi/virtio_scsi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 3e79a2f..7554d78 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -219,7 +219,7 @@ static int virtscsi_kick_event(struct virtio_scsi *vscsi,
struct scatterlist sg;
unsigned long flags;
- sg_set_buf(&sg, &event_node->event, sizeof(struct virtio_scsi_event));
+ sg_init_one(&sg, &event_node->event, sizeof(struct virtio_scsi_event));
spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);

35
debian/patches/features/all/virtio_scsi/0011-SCSI-virtio-scsi-fix-LUNs-greater-than-255.patch vendored Normal file
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@ -0,0 +1,35 @@
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 2 Oct 2012 17:25:47 +0200
Subject: [11/12] [SCSI] virtio-scsi: fix LUNs greater than 255
commit 9da5f5ac6affad8dd8cd80f5cca26e4335e1728b upstream.
virtio-scsi needs to report LUNs greater than 256 using the "flat"
format. Because the Linux SCSI layer just maps the SCSI LUN to
an u32, without any parsing, these end up in the range from 16640
to 32767. Fix max_lun to account for the possibility that logical
unit numbers are encoded with the "flat" format.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---
drivers/scsi/virtio_scsi.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 7554d78..a7cf726 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -677,7 +677,11 @@ static int __devinit virtscsi_probe(struct virtio_device *vdev)
cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1;
shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue);
shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF;
- shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1;
+
+ /* LUNs > 256 are reported with format 1, so they go in the range
+ * 16640-32767.
+ */
+ shost->max_lun = virtscsi_config_get(vdev, max_lun) + 1 + 0x4000;
shost->max_id = num_targets;
shost->max_channel = 0;
shost->max_cmd_len = VIRTIO_SCSI_CDB_SIZE;

96
debian/patches/features/all/virtio_scsi/0012-SCSI-virtio-scsi-support-online-resizing-of-disks.patch vendored Normal file
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@ -0,0 +1,96 @@
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 2 Oct 2012 17:25:48 +0200
Subject: [12/12] [SCSI] virtio-scsi: support online resizing of disks
commit 865b58c05b841964f48f574c2027311bd04db8a1 upstream.
Support the LUN parameter change event. Currently, the host fires this event
when the capacity of a disk is changed from the virtual machine monitor.
The resize then appears in the kernel log like this:
sd 0:0:0:0: [sda] 46137344 512-byte logical blocks: (23.6 GB/22.0 GIb)
sda: detected capacity change from 22548578304 to 23622320128
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
---
drivers/scsi/virtio_scsi.c | 31 ++++++++++++++++++++++++++++++-
include/linux/virtio_scsi.h | 2 ++
2 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index a7cf726..595af1a 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -279,6 +279,31 @@ static void virtscsi_handle_transport_reset(struct virtio_scsi *vscsi,
}
}
+static void virtscsi_handle_param_change(struct virtio_scsi *vscsi,
+ struct virtio_scsi_event *event)
+{
+ struct scsi_device *sdev;
+ struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
+ unsigned int target = event->lun[1];
+ unsigned int lun = (event->lun[2] << 8) | event->lun[3];
+ u8 asc = event->reason & 255;
+ u8 ascq = event->reason >> 8;
+
+ sdev = scsi_device_lookup(shost, 0, target, lun);
+ if (!sdev) {
+ pr_err("SCSI device %d 0 %d %d not found\n",
+ shost->host_no, target, lun);
+ return;
+ }
+
+ /* Handle "Parameters changed", "Mode parameters changed", and
+ "Capacity data has changed". */
+ if (asc == 0x2a && (ascq == 0x00 || ascq == 0x01 || ascq == 0x09))
+ scsi_rescan_device(&sdev->sdev_gendev);
+
+ scsi_device_put(sdev);
+}
+
static void virtscsi_handle_event(struct work_struct *work)
{
struct virtio_scsi_event_node *event_node =
@@ -297,6 +322,9 @@ static void virtscsi_handle_event(struct work_struct *work)
case VIRTIO_SCSI_T_TRANSPORT_RESET:
virtscsi_handle_transport_reset(vscsi, event);
break;
+ case VIRTIO_SCSI_T_PARAM_CHANGE:
+ virtscsi_handle_param_change(vscsi, event);
+ break;
default:
pr_err("Unsupport virtio scsi event %x\n", event->event);
}
@@ -737,7 +765,8 @@ static struct virtio_device_id id_table[] = {
};
static unsigned int features[] = {
- VIRTIO_SCSI_F_HOTPLUG
+ VIRTIO_SCSI_F_HOTPLUG,
+ VIRTIO_SCSI_F_CHANGE,
};
static struct virtio_driver virtio_scsi_driver = {
diff --git a/include/linux/virtio_scsi.h b/include/linux/virtio_scsi.h
index dc8d305..d6b4440 100644
--- a/include/linux/virtio_scsi.h
+++ b/include/linux/virtio_scsi.h
@@ -72,6 +72,7 @@ struct virtio_scsi_config {
/* Feature Bits */
#define VIRTIO_SCSI_F_INOUT 0
#define VIRTIO_SCSI_F_HOTPLUG 1
+#define VIRTIO_SCSI_F_CHANGE 2
/* Response codes */
#define VIRTIO_SCSI_S_OK 0
@@ -108,6 +109,7 @@ struct virtio_scsi_config {
#define VIRTIO_SCSI_T_NO_EVENT 0
#define VIRTIO_SCSI_T_TRANSPORT_RESET 1
#define VIRTIO_SCSI_T_ASYNC_NOTIFY 2
+#define VIRTIO_SCSI_T_PARAM_CHANGE 3
/* Reasons of transport reset event */
#define VIRTIO_SCSI_EVT_RESET_HARD 0

122
debian/patches/features/all/virtio_scsi/virtio-support-unlocked-queue-kick.patch vendored Normal file
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@ -0,0 +1,122 @@
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 12 Jan 2012 15:44:43 +1030
Subject: virtio: support unlocked queue kick
commit 41f0377f73039ca6fe97a469d1941a89cd9757f1 upstream.
Based on patch by Christoph for virtio_blk speedup:
Split virtqueue_kick to be able to do the actual notification
outside the lock protecting the virtqueue. This patch was
originally done by Stefan Hajnoczi, but I can't find the
original one anymore and had to recreated it from memory.
Pointers to the original or corrections for the commit message
are welcome.
Stefan's patch was here:
https://github.com/stefanha/linux/commit/a6d06644e3a58e57a774e77d7dc34c4a5a2e7496
http://www.spinics.net/lists/linux-virtualization/msg14616.html
Third time's the charm!
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
[bwh: Backported to 3.2: adjust context]
---
drivers/virtio/virtio_ring.c | 60 +++++++++++++++++++++++++++++++++---------
include/linux/virtio.h | 4 +++
2 files changed, 52 insertions(+), 12 deletions(-)
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -245,10 +245,23 @@ add_head:
}
EXPORT_SYMBOL_GPL(virtqueue_add_buf_gfp);
-void virtqueue_kick(struct virtqueue *_vq)
+/**
+ * virtqueue_kick_prepare - first half of split virtqueue_kick call.
+ * @vq: the struct virtqueue
+ *
+ * Instead of virtqueue_kick(), you can do:
+ * if (virtqueue_kick_prepare(vq))
+ * virtqueue_notify(vq);
+ *
+ * This is sometimes useful because the virtqueue_kick_prepare() needs
+ * to be serialized, but the actual virtqueue_notify() call does not.
+ */
+bool virtqueue_kick_prepare(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
u16 new, old;
+ bool needs_kick;
+
START_USE(vq);
/* Descriptors and available array need to be set before we expose the
* new available array entries. */
@@ -261,13 +274,46 @@ void virtqueue_kick(struct virtqueue *_v
/* Need to update avail index before checking if we should notify */
virtio_mb();
- if (vq->event ?
- vring_need_event(vring_avail_event(&vq->vring), new, old) :
- !(vq->vring.used->flags & VRING_USED_F_NO_NOTIFY))
- /* Prod other side to tell it about changes. */
- vq->notify(&vq->vq);
-
+ if (vq->event) {
+ needs_kick = vring_need_event(vring_avail_event(&vq->vring),
+ new, old);
+ } else {
+ needs_kick = !(vq->vring.used->flags & VRING_USED_F_NO_NOTIFY);
+ }
END_USE(vq);
+ return needs_kick;
+}
+EXPORT_SYMBOL_GPL(virtqueue_kick_prepare);
+
+/**
+ * virtqueue_notify - second half of split virtqueue_kick call.
+ * @vq: the struct virtqueue
+ *
+ * This does not need to be serialized.
+ */
+void virtqueue_notify(struct virtqueue *_vq)
+{
+ struct vring_virtqueue *vq = to_vvq(_vq);
+
+ /* Prod other side to tell it about changes. */
+ vq->notify(_vq);
+}
+EXPORT_SYMBOL_GPL(virtqueue_notify);
+
+/**
+ * virtqueue_kick - update after add_buf
+ * @vq: the struct virtqueue
+ *
+ * After one or more virtqueue_add_buf calls, invoke this to kick
+ * the other side.
+ *
+ * Caller must ensure we don't call this with other virtqueue
+ * operations at the same time (except where noted).
+ */
+void virtqueue_kick(struct virtqueue *vq)
+{
+ if (virtqueue_kick_prepare(vq))
+ virtqueue_notify(vq);
}
EXPORT_SYMBOL_GPL(virtqueue_kick);
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -90,6 +90,10 @@ static inline int virtqueue_add_buf(stru
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);

15
debian/patches/series vendored
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@ -502,3 +502,18 @@ bugfix/x86/drm-i915-Disable-AsyncFlip-performance-optimisations.patch
bugfix/x86/drm-i915-GFX_MODE-Flush-TLB-Invalidate-Mode-must-be-.patch
bugfix/x86/drm-i915-dump-UTS_RELEASE-into-the-error_state.patch
features/all/drm/efi-Make-efi_enabled-a-function-to-query-EFI-facilit.patch
# virtio-scsi from 3.7
features/all/virtio_scsi/0001-SCSI-virtio-scsi-SCSI-driver-for-QEMU-based-virtual-.patch
features/all/virtio_scsi/0002-SCSI-virtio_scsi-fix-TMF-use-after-free.patch
features/all/virtio_scsi/virtio-support-unlocked-queue-kick.patch
features/all/virtio_scsi/0003-SCSI-virtio-scsi-unlock-during-kick.patch
features/all/virtio_scsi/0004-SCSI-virtio-scsi-split-locking-per-vq.patch
features/all/virtio_scsi/0005-SCSI-virtio-scsi-release-sg_lock-after-add_buf.patch
features/all/virtio_scsi/0006-SCSI-virtio-scsi-split-scatterlist-per-target.patch
features/all/virtio_scsi/0007-SCSI-virtio-scsi-hotplug-support-for-virtio-scsi.patch
features/all/virtio_scsi/0008-SCSI-virtio-scsi-Add-vdrv-scan-for-post-VIRTIO_CONFI.patch
features/all/virtio_scsi/0009-SCSI-scsi-virtio-scsi-Fix-address-translation-failur.patch
features/all/virtio_scsi/0010-SCSI-virtio-scsi-initialize-scatterlist-structure.patch
features/all/virtio_scsi/0011-SCSI-virtio-scsi-fix-LUNs-greater-than-255.patch
features/all/virtio_scsi/0012-SCSI-virtio-scsi-support-online-resizing-of-disks.patch