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authorLinus Torvalds <torvalds@linux-foundation.org>2015-04-16 22:01:03 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-16 22:01:03 +0300
commit497a5df7bf6ffd136ae21c49d1a01292930d7ca2 (patch)
tree774215d43cdc9fbd8660086d1801400163dcbd52 /drivers/xen/xen-scsiback.c
parent714d8e7e27197dd39b2550e762a6a6fcf397a471 (diff)
parent0b97b03d88b40bfbd7ff0e069186a137d9786d43 (diff)
downloadlinux-497a5df7bf6ffd136ae21c49d1a01292930d7ca2.tar.xz
Merge tag 'stable/for-linus-4.1-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen features and fixes from David Vrabel: - use a single source list of hypercalls, generating other tables etc. at build time. - add a "Xen PV" APIC driver to support >255 VCPUs in PV guests. - significant performance improve to guest save/restore/migration. - scsiback/front save/restore support. - infrastructure for multi-page xenbus rings. - misc fixes. * tag 'stable/for-linus-4.1-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: xen/pci: Try harder to get PXM information for Xen xenbus_client: Extend interface to support multi-page ring xen-pciback: also support disabling of bus-mastering and memory-write-invalidate xen: support suspend/resume in pvscsi frontend xen: scsiback: add LUN of restored domain xen-scsiback: define a pr_fmt macro with xen-pvscsi xen/mce: fix up xen_late_init_mcelog() error handling xen/privcmd: improve performance of MMAPBATCH_V2 xen: unify foreign GFN map/unmap for auto-xlated physmap guests x86/xen/apic: WARN with details. x86/xen: Provide a "Xen PV" APIC driver to support >255 VCPUs xen/pciback: Don't print scary messages when unsupported by hypervisor. xen: use generated hypercall symbols in arch/x86/xen/xen-head.S xen: use generated hypervisor symbols in arch/x86/xen/trace.c xen: synchronize include/xen/interface/xen.h with xen xen: build infrastructure for generating hypercall depending symbols xen: balloon: Use static attribute groups for sysfs entries xen: pcpu: Use static attribute groups for sysfs entry
Diffstat (limited to 'drivers/xen/xen-scsiback.c')
-rw-r--r--drivers/xen/xen-scsiback.c96
1 files changed, 51 insertions, 45 deletions
diff --git a/drivers/xen/xen-scsiback.c b/drivers/xen/xen-scsiback.c
index 42bd55a6c237..07ef38325223 100644
--- a/drivers/xen/xen-scsiback.c
+++ b/drivers/xen/xen-scsiback.c
@@ -31,6 +31,8 @@
* IN THE SOFTWARE.
*/
+#define pr_fmt(fmt) "xen-pvscsi: " fmt
+
#include <stdarg.h>
#include <linux/module.h>
@@ -69,9 +71,6 @@
#include <xen/interface/grant_table.h>
#include <xen/interface/io/vscsiif.h>
-#define DPRINTK(_f, _a...) \
- pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a)
-
#define VSCSI_VERSION "v0.1"
#define VSCSI_NAMELEN 32
@@ -271,7 +270,7 @@ static void scsiback_print_status(char *sense_buffer, int errors,
{
struct scsiback_tpg *tpg = pending_req->v2p->tpg;
- pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
+ pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
tpg->tport->tport_name, pending_req->v2p->lun,
pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
host_byte(errors), driver_byte(errors));
@@ -427,7 +426,7 @@ static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
BUG_ON(err);
for (i = 0; i < cnt; i++) {
if (unlikely(map[i].status != GNTST_okay)) {
- pr_err("xen-pvscsi: invalid buffer -- could not remap it\n");
+ pr_err("invalid buffer -- could not remap it\n");
map[i].handle = SCSIBACK_INVALID_HANDLE;
err = -ENOMEM;
} else {
@@ -449,7 +448,7 @@ static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
for (i = 0; i < cnt; i++) {
if (get_free_page(pg + mapcount)) {
put_free_pages(pg, mapcount);
- pr_err("xen-pvscsi: no grant page\n");
+ pr_err("no grant page\n");
return -ENOMEM;
}
gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
@@ -492,7 +491,7 @@ static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
return 0;
if (nr_segments > VSCSIIF_SG_TABLESIZE) {
- DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n",
+ pr_debug("invalid parameter nr_seg = %d\n",
ring_req->nr_segments);
return -EINVAL;
}
@@ -516,13 +515,12 @@ static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
nr_segments += n_segs;
}
if (nr_segments > SG_ALL) {
- DPRINTK("xen-pvscsi: invalid nr_seg = %d\n",
- nr_segments);
+ pr_debug("invalid nr_seg = %d\n", nr_segments);
return -EINVAL;
}
}
- /* free of (sgl) in fast_flush_area()*/
+ /* free of (sgl) in fast_flush_area() */
pending_req->sgl = kmalloc_array(nr_segments,
sizeof(struct scatterlist), GFP_KERNEL);
if (!pending_req->sgl)
@@ -679,7 +677,8 @@ static int prepare_pending_reqs(struct vscsibk_info *info,
v2p = scsiback_do_translation(info, &vir);
if (!v2p) {
pending_req->v2p = NULL;
- DPRINTK("xen-pvscsi: doesn't exist.\n");
+ pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n",
+ vir.chn, vir.tgt, vir.lun);
return -ENODEV;
}
pending_req->v2p = v2p;
@@ -690,14 +689,14 @@ static int prepare_pending_reqs(struct vscsibk_info *info,
(pending_req->sc_data_direction != DMA_TO_DEVICE) &&
(pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
(pending_req->sc_data_direction != DMA_NONE)) {
- DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n",
+ pr_debug("invalid parameter data_dir = %d\n",
pending_req->sc_data_direction);
return -EINVAL;
}
pending_req->cmd_len = ring_req->cmd_len;
if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
- DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n",
+ pr_debug("invalid parameter cmd_len = %d\n",
pending_req->cmd_len);
return -EINVAL;
}
@@ -721,7 +720,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info *info)
if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
rc = ring->rsp_prod_pvt;
- pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
+ pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
info->domid, rp, rc, rp - rc);
info->ring_error = 1;
return 0;
@@ -772,7 +771,7 @@ static int scsiback_do_cmd_fn(struct vscsibk_info *info)
scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
break;
default:
- pr_err_ratelimited("xen-pvscsi: invalid request\n");
+ pr_err_ratelimited("invalid request\n");
scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
0, pending_req);
kmem_cache_free(scsiback_cachep, pending_req);
@@ -810,7 +809,7 @@ static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
if (info->irq)
return -1;
- err = xenbus_map_ring_valloc(info->dev, ring_ref, &area);
+ err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area);
if (err)
return err;
@@ -874,14 +873,13 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
lunp = strrchr(phy, ':');
if (!lunp) {
- pr_err("xen-pvscsi: illegal format of physical device %s\n",
- phy);
+ pr_err("illegal format of physical device %s\n", phy);
return -EINVAL;
}
*lunp = 0;
lunp++;
if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
- pr_err("xen-pvscsi: lun number not valid: %s\n", lunp);
+ pr_err("lun number not valid: %s\n", lunp);
return -EINVAL;
}
@@ -909,7 +907,7 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
mutex_unlock(&scsiback_mutex);
if (!tpg) {
- pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error);
+ pr_err("%s:%d %s\n", phy, lun, error);
return -ENODEV;
}
@@ -926,7 +924,7 @@ static int scsiback_add_translation_entry(struct vscsibk_info *info,
if ((entry->v.chn == v->chn) &&
(entry->v.tgt == v->tgt) &&
(entry->v.lun == v->lun)) {
- pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n");
+ pr_warn("Virtual ID is already used. Assignment was not performed.\n");
err = -EEXIST;
goto out;
}
@@ -992,15 +990,15 @@ found:
}
static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
- char *phy, struct ids_tuple *vir)
+ char *phy, struct ids_tuple *vir, int try)
{
if (!scsiback_add_translation_entry(info, phy, vir)) {
if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
"%d", XenbusStateInitialised)) {
- pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+ pr_err("xenbus_printf error %s\n", state);
scsiback_del_translation_entry(info, vir);
}
- } else {
+ } else if (!try) {
xenbus_printf(XBT_NIL, info->dev->nodename, state,
"%d", XenbusStateClosed);
}
@@ -1012,7 +1010,7 @@ static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state,
if (!scsiback_del_translation_entry(info, vir)) {
if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
"%d", XenbusStateClosed))
- pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
+ pr_err("xenbus_printf error %s\n", state);
}
}
@@ -1060,10 +1058,19 @@ static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
switch (op) {
case VSCSIBACK_OP_ADD_OR_DEL_LUN:
- if (device_state == XenbusStateInitialising)
- scsiback_do_add_lun(info, state, phy, &vir);
- if (device_state == XenbusStateClosing)
+ switch (device_state) {
+ case XenbusStateInitialising:
+ scsiback_do_add_lun(info, state, phy, &vir, 0);
+ break;
+ case XenbusStateConnected:
+ scsiback_do_add_lun(info, state, phy, &vir, 1);
+ break;
+ case XenbusStateClosing:
scsiback_do_del_lun(info, state, &vir);
+ break;
+ default:
+ break;
+ }
break;
case VSCSIBACK_OP_UPDATEDEV_STATE:
@@ -1071,15 +1078,14 @@ static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
/* modify vscsi-devs/dev-x/state */
if (xenbus_printf(XBT_NIL, dev->nodename, state,
"%d", XenbusStateConnected)) {
- pr_err("xen-pvscsi: xenbus_printf error %s\n",
- str);
+ pr_err("xenbus_printf error %s\n", str);
scsiback_del_translation_entry(info, &vir);
xenbus_printf(XBT_NIL, dev->nodename, state,
"%d", XenbusStateClosed);
}
}
break;
- /*When it is necessary, processing is added here.*/
+ /* When it is necessary, processing is added here. */
default:
break;
}
@@ -1196,7 +1202,7 @@ static int scsiback_probe(struct xenbus_device *dev,
struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info),
GFP_KERNEL);
- DPRINTK("%p %d\n", dev, dev->otherend_id);
+ pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);
if (!info) {
xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure");
@@ -1227,7 +1233,7 @@ static int scsiback_probe(struct xenbus_device *dev,
return 0;
fail:
- pr_warn("xen-pvscsi: %s failed\n", __func__);
+ pr_warn("%s failed\n", __func__);
scsiback_remove(dev);
return err;
@@ -1432,7 +1438,7 @@ check_len:
}
snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]);
- pr_debug("xen-pvscsi: Allocated emulated Target %s Address: %s\n",
+ pr_debug("Allocated emulated Target %s Address: %s\n",
scsiback_dump_proto_id(tport), name);
return &tport->tport_wwn;
@@ -1443,7 +1449,7 @@ static void scsiback_drop_tport(struct se_wwn *wwn)
struct scsiback_tport *tport = container_of(wwn,
struct scsiback_tport, tport_wwn);
- pr_debug("xen-pvscsi: Deallocating emulated Target %s Address: %s\n",
+ pr_debug("Deallocating emulated Target %s Address: %s\n",
scsiback_dump_proto_id(tport), tport->tport_name);
kfree(tport);
@@ -1470,8 +1476,8 @@ static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg)
static int scsiback_check_stop_free(struct se_cmd *se_cmd)
{
/*
- * Do not release struct se_cmd's containing a valid TMR
- * pointer. These will be released directly in scsiback_device_action()
+ * Do not release struct se_cmd's containing a valid TMR pointer.
+ * These will be released directly in scsiback_device_action()
* with transport_generic_free_cmd().
*/
if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
@@ -1637,7 +1643,7 @@ static int scsiback_make_nexus(struct scsiback_tpg *tpg,
return -ENOMEM;
}
/*
- * Initialize the struct se_session pointer
+ * Initialize the struct se_session pointer
*/
tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
if (IS_ERR(tv_nexus->tvn_se_sess)) {
@@ -1705,7 +1711,7 @@ static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
return -EBUSY;
}
- pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
+ pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n",
scsiback_dump_proto_id(tpg->tport),
tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
@@ -1751,7 +1757,7 @@ static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg,
unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
int ret;
/*
- * Shutdown the active I_T nexus if 'NULL' is passed..
+ * Shutdown the active I_T nexus if 'NULL' is passed.
*/
if (!strncmp(page, "NULL", 4)) {
ret = scsiback_drop_nexus(tpg);
@@ -1922,7 +1928,7 @@ static void scsiback_drop_tpg(struct se_portal_group *se_tpg)
*/
scsiback_drop_nexus(tpg);
/*
- * Deregister the se_tpg from TCM..
+ * Deregister the se_tpg from TCM.
*/
core_tpg_deregister(se_tpg);
kfree(tpg);
@@ -1992,7 +1998,7 @@ static int scsiback_register_configfs(void)
struct target_fabric_configfs *fabric;
int ret;
- pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
+ pr_debug("fabric module %s on %s/%s on "UTS_RELEASE"\n",
VSCSI_VERSION, utsname()->sysname, utsname()->machine);
/*
* Register the top level struct config_item_type with TCM core
@@ -2029,7 +2035,7 @@ static int scsiback_register_configfs(void)
* Setup our local pointer to *fabric
*/
scsiback_fabric_configfs = fabric;
- pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n");
+ pr_debug("Set fabric -> scsiback_fabric_configfs\n");
return 0;
};
@@ -2040,7 +2046,7 @@ static void scsiback_deregister_configfs(void)
target_fabric_configfs_deregister(scsiback_fabric_configfs);
scsiback_fabric_configfs = NULL;
- pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n");
+ pr_debug("Cleared scsiback_fabric_configfs\n");
};
static const struct xenbus_device_id scsiback_ids[] = {
@@ -2091,7 +2097,7 @@ out_unregister_xenbus:
xenbus_unregister_driver(&scsiback_driver);
out_cache_destroy:
kmem_cache_destroy(scsiback_cachep);
- pr_err("xen-pvscsi: %s: error %d\n", __func__, ret);
+ pr_err("%s: error %d\n", __func__, ret);
return ret;
}