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-rw-r--r--arch/s390/kernel/machine_kexec.c1
-rw-r--r--drivers/s390/cio/chsc.c34
-rw-r--r--drivers/s390/cio/cio.c1
-rw-r--r--drivers/s390/cio/css.c12
-rw-r--r--drivers/s390/cio/css.h2
-rw-r--r--drivers/s390/cio/device_fsm.c85
-rw-r--r--drivers/s390/cio/device_pgid.c122
-rw-r--r--drivers/s390/cio/device_status.c7
-rw-r--r--drivers/s390/s390mach.c10
-rw-r--r--include/asm-s390/cio.h2
10 files changed, 228 insertions, 48 deletions
diff --git a/arch/s390/kernel/machine_kexec.c b/arch/s390/kernel/machine_kexec.c
index fbde6a91526..60b1ea9f946 100644
--- a/arch/s390/kernel/machine_kexec.c
+++ b/arch/s390/kernel/machine_kexec.c
@@ -63,6 +63,7 @@ NORET_TYPE void
machine_kexec(struct kimage *image)
{
clear_all_subchannels();
+ cio_reset_channel_paths();
/* Disable lowcore protection */
ctl_clear_bit(0,28);
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c
index a01f3bba4a7..61ce3f1d522 100644
--- a/drivers/s390/cio/chsc.c
+++ b/drivers/s390/cio/chsc.c
@@ -1464,6 +1464,40 @@ chsc_get_chp_desc(struct subchannel *sch, int chp_no)
return desc;
}
+static int reset_channel_path(struct channel_path *chp)
+{
+ int cc;
+
+ cc = rchp(chp->id);
+ switch (cc) {
+ case 0:
+ return 0;
+ case 2:
+ return -EBUSY;
+ default:
+ return -ENODEV;
+ }
+}
+
+static void reset_channel_paths_css(struct channel_subsystem *css)
+{
+ int i;
+
+ for (i = 0; i <= __MAX_CHPID; i++) {
+ if (css->chps[i])
+ reset_channel_path(css->chps[i]);
+ }
+}
+
+void cio_reset_channel_paths(void)
+{
+ int i;
+
+ for (i = 0; i <= __MAX_CSSID; i++) {
+ if (css[i] && css[i]->valid)
+ reset_channel_paths_css(css[i]);
+ }
+}
static int __init
chsc_alloc_sei_area(void)
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index f27b2b866f5..e36ca27f577 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -876,5 +876,6 @@ void
reipl(unsigned long devno)
{
clear_all_subchannels();
+ cio_reset_channel_paths();
do_reipl(devno);
}
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index a09deea5d68..13eeea3d547 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -623,9 +623,13 @@ init_channel_subsystem (void)
ret = device_register(&css[i]->device);
if (ret)
goto out_free;
- if (css_characteristics_avail && css_chsc_characteristics.secm)
- device_create_file(&css[i]->device,
- &dev_attr_cm_enable);
+ if (css_characteristics_avail &&
+ css_chsc_characteristics.secm) {
+ ret = device_create_file(&css[i]->device,
+ &dev_attr_cm_enable);
+ if (ret)
+ goto out_device;
+ }
}
css_init_done = 1;
@@ -633,6 +637,8 @@ init_channel_subsystem (void)
for_each_subchannel(__init_channel_subsystem, NULL);
return 0;
+out_device:
+ device_unregister(&css[i]->device);
out_free:
kfree(css[i]);
out_unregister:
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index 15f7f7cb0ec..8aabb4adeb5 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -100,7 +100,7 @@ struct ccw_device_private {
struct qdio_irq *qdio_data;
struct irb irb; /* device status */
struct senseid senseid; /* SenseID info */
- struct pgid pgid; /* path group ID */
+ struct pgid pgid[8]; /* path group IDs per chpid*/
struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
struct work_struct kick_work;
wait_queue_head_t wait_q;
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index cb1af0b6f03..ac6e0c7e43d 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -378,6 +378,56 @@ ccw_device_done(struct ccw_device *cdev, int state)
put_device (&cdev->dev);
}
+static inline int cmp_pgid(struct pgid *p1, struct pgid *p2)
+{
+ char *c1;
+ char *c2;
+
+ c1 = (char *)p1;
+ c2 = (char *)p2;
+
+ return memcmp(c1 + 1, c2 + 1, sizeof(struct pgid) - 1);
+}
+
+static void __ccw_device_get_common_pgid(struct ccw_device *cdev)
+{
+ int i;
+ int last;
+
+ last = 0;
+ for (i = 0; i < 8; i++) {
+ if (cdev->private->pgid[i].inf.ps.state1 == SNID_STATE1_RESET)
+ /* No PGID yet */
+ continue;
+ if (cdev->private->pgid[last].inf.ps.state1 ==
+ SNID_STATE1_RESET) {
+ /* First non-zero PGID */
+ last = i;
+ continue;
+ }
+ if (cmp_pgid(&cdev->private->pgid[i],
+ &cdev->private->pgid[last]) == 0)
+ /* Non-conflicting PGIDs */
+ continue;
+
+ /* PGID mismatch, can't pathgroup. */
+ CIO_MSG_EVENT(0, "SNID - pgid mismatch for device "
+ "0.%x.%04x, can't pathgroup\n",
+ cdev->private->ssid, cdev->private->devno);
+ cdev->private->options.pgroup = 0;
+ return;
+ }
+ if (cdev->private->pgid[last].inf.ps.state1 ==
+ SNID_STATE1_RESET)
+ /* No previous pgid found */
+ memcpy(&cdev->private->pgid[0], &css[0]->global_pgid,
+ sizeof(struct pgid));
+ else
+ /* Use existing pgid */
+ memcpy(&cdev->private->pgid[0], &cdev->private->pgid[last],
+ sizeof(struct pgid));
+}
+
/*
* Function called from device_pgid.c after sense path ground has completed.
*/
@@ -388,24 +438,26 @@ ccw_device_sense_pgid_done(struct ccw_device *cdev, int err)
sch = to_subchannel(cdev->dev.parent);
switch (err) {
- case 0:
- /* Start Path Group verification. */
- sch->vpm = 0; /* Start with no path groups set. */
- cdev->private->state = DEV_STATE_VERIFY;
- ccw_device_verify_start(cdev);
+ case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */
+ cdev->private->options.pgroup = 0;
+ break;
+ case 0: /* success */
+ case -EACCES: /* partial success, some paths not operational */
+ /* Check if all pgids are equal or 0. */
+ __ccw_device_get_common_pgid(cdev);
break;
case -ETIME: /* Sense path group id stopped by timeout. */
case -EUSERS: /* device is reserved for someone else. */
ccw_device_done(cdev, DEV_STATE_BOXED);
- break;
- case -EOPNOTSUPP: /* path grouping not supported, just set online. */
- cdev->private->options.pgroup = 0;
- ccw_device_done(cdev, DEV_STATE_ONLINE);
- break;
+ return;
default:
ccw_device_done(cdev, DEV_STATE_NOT_OPER);
- break;
+ return;
}
+ /* Start Path Group verification. */
+ sch->vpm = 0; /* Start with no path groups set. */
+ cdev->private->state = DEV_STATE_VERIFY;
+ ccw_device_verify_start(cdev);
}
/*
@@ -562,8 +614,9 @@ ccw_device_online(struct ccw_device *cdev)
}
/* Do we want to do path grouping? */
if (!cdev->private->options.pgroup) {
- /* No, set state online immediately. */
- ccw_device_done(cdev, DEV_STATE_ONLINE);
+ /* Start initial path verification. */
+ cdev->private->state = DEV_STATE_VERIFY;
+ ccw_device_verify_start(cdev);
return 0;
}
/* Do a SensePGID first. */
@@ -609,6 +662,7 @@ ccw_device_offline(struct ccw_device *cdev)
/* Are we doing path grouping? */
if (!cdev->private->options.pgroup) {
/* No, set state offline immediately. */
+ sch->vpm = 0;
ccw_device_done(cdev, DEV_STATE_OFFLINE);
return 0;
}
@@ -705,8 +759,6 @@ ccw_device_online_verify(struct ccw_device *cdev, enum dev_event dev_event)
{
struct subchannel *sch;
- if (!cdev->private->options.pgroup)
- return;
if (cdev->private->state == DEV_STATE_W4SENSE) {
cdev->private->flags.doverify = 1;
return;
@@ -995,8 +1047,7 @@ static void
ccw_device_wait4io_verify(struct ccw_device *cdev, enum dev_event dev_event)
{
/* When the I/O has terminated, we have to start verification. */
- if (cdev->private->options.pgroup)
- cdev->private->flags.doverify = 1;
+ cdev->private->flags.doverify = 1;
}
static void
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c
index 54cb64ed078..32610fd8868 100644
--- a/drivers/s390/cio/device_pgid.c
+++ b/drivers/s390/cio/device_pgid.c
@@ -33,12 +33,17 @@ __ccw_device_sense_pgid_start(struct ccw_device *cdev)
struct subchannel *sch;
struct ccw1 *ccw;
int ret;
+ int i;
sch = to_subchannel(cdev->dev.parent);
+ /* Return if we already checked on all paths. */
+ if (cdev->private->imask == 0)
+ return (sch->lpm == 0) ? -ENODEV : -EACCES;
+ i = 8 - ffs(cdev->private->imask);
+
/* Setup sense path group id channel program. */
ccw = cdev->private->iccws;
ccw->cmd_code = CCW_CMD_SENSE_PGID;
- ccw->cda = (__u32) __pa (&cdev->private->pgid);
ccw->count = sizeof (struct pgid);
ccw->flags = CCW_FLAG_SLI;
@@ -48,6 +53,7 @@ __ccw_device_sense_pgid_start(struct ccw_device *cdev)
ret = -ENODEV;
while (cdev->private->imask != 0) {
/* Try every path multiple times. */
+ ccw->cda = (__u32) __pa (&cdev->private->pgid[i]);
if (cdev->private->iretry > 0) {
cdev->private->iretry--;
ret = cio_start (sch, cdev->private->iccws,
@@ -64,7 +70,9 @@ __ccw_device_sense_pgid_start(struct ccw_device *cdev)
}
cdev->private->imask >>= 1;
cdev->private->iretry = 5;
+ i++;
}
+
return ret;
}
@@ -76,7 +84,7 @@ ccw_device_sense_pgid_start(struct ccw_device *cdev)
cdev->private->state = DEV_STATE_SENSE_PGID;
cdev->private->imask = 0x80;
cdev->private->iretry = 5;
- memset (&cdev->private->pgid, 0, sizeof (struct pgid));
+ memset (&cdev->private->pgid, 0, sizeof (cdev->private->pgid));
ret = __ccw_device_sense_pgid_start(cdev);
if (ret && ret != -EBUSY)
ccw_device_sense_pgid_done(cdev, ret);
@@ -91,6 +99,7 @@ __ccw_device_check_sense_pgid(struct ccw_device *cdev)
{
struct subchannel *sch;
struct irb *irb;
+ int i;
sch = to_subchannel(cdev->dev.parent);
irb = &cdev->private->irb;
@@ -124,7 +133,8 @@ __ccw_device_check_sense_pgid(struct ccw_device *cdev)
sch->schid.sch_no, sch->orb.lpm);
return -EACCES;
}
- if (cdev->private->pgid.inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
+ i = 8 - ffs(cdev->private->imask);
+ if (cdev->private->pgid[i].inf.ps.state2 == SNID_STATE2_RESVD_ELSE) {
CIO_MSG_EVENT(2, "SNID - Device %04x on Subchannel 0.%x.%04x "
"is reserved by someone else\n",
cdev->private->devno, sch->schid.ssid,
@@ -162,12 +172,6 @@ ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
memset(&cdev->private->irb, 0, sizeof(struct irb));
switch (ret) {
/* 0, -ETIME, -EOPNOTSUPP, -EAGAIN, -EACCES or -EUSERS */
- case 0: /* Sense Path Group ID successful. */
- if (cdev->private->pgid.inf.ps.state1 == SNID_STATE1_RESET)
- memcpy(&cdev->private->pgid, &css[0]->global_pgid,
- sizeof(struct pgid));
- ccw_device_sense_pgid_done(cdev, 0);
- break;
case -EOPNOTSUPP: /* Sense Path Group ID not supported */
ccw_device_sense_pgid_done(cdev, -EOPNOTSUPP);
break;
@@ -176,13 +180,15 @@ ccw_device_sense_pgid_irq(struct ccw_device *cdev, enum dev_event dev_event)
break;
case -EACCES: /* channel is not operational. */
sch->lpm &= ~cdev->private->imask;
+ /* Fall through. */
+ case 0: /* Sense Path Group ID successful. */
cdev->private->imask >>= 1;
cdev->private->iretry = 5;
/* Fall through. */
case -EAGAIN: /* Try again. */
ret = __ccw_device_sense_pgid_start(cdev);
if (ret != 0 && ret != -EBUSY)
- ccw_device_sense_pgid_done(cdev, -ENODEV);
+ ccw_device_sense_pgid_done(cdev, ret);
break;
case -EUSERS: /* device is reserved for someone else. */
ccw_device_sense_pgid_done(cdev, -EUSERS);
@@ -203,20 +209,20 @@ __ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
sch = to_subchannel(cdev->dev.parent);
/* Setup sense path group id channel program. */
- cdev->private->pgid.inf.fc = func;
+ cdev->private->pgid[0].inf.fc = func;
ccw = cdev->private->iccws;
if (!cdev->private->flags.pgid_single) {
- cdev->private->pgid.inf.fc |= SPID_FUNC_MULTI_PATH;
+ cdev->private->pgid[0].inf.fc |= SPID_FUNC_MULTI_PATH;
ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
ccw->cda = 0;
ccw->count = 0;
ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
ccw++;
} else
- cdev->private->pgid.inf.fc |= SPID_FUNC_SINGLE_PATH;
+ cdev->private->pgid[0].inf.fc |= SPID_FUNC_SINGLE_PATH;
ccw->cmd_code = CCW_CMD_SET_PGID;
- ccw->cda = (__u32) __pa (&cdev->private->pgid);
+ ccw->cda = (__u32) __pa (&cdev->private->pgid[0]);
ccw->count = sizeof (struct pgid);
ccw->flags = CCW_FLAG_SLI;
@@ -244,6 +250,48 @@ __ccw_device_do_pgid(struct ccw_device *cdev, __u8 func)
}
/*
+ * Helper function to send a nop ccw down a path.
+ */
+static int __ccw_device_do_nop(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+ struct ccw1 *ccw;
+ int ret;
+
+ sch = to_subchannel(cdev->dev.parent);
+
+ /* Setup nop channel program. */
+ ccw = cdev->private->iccws;
+ ccw->cmd_code = CCW_CMD_NOOP;
+ ccw->cda = 0;
+ ccw->count = 0;
+ ccw->flags = CCW_FLAG_SLI;
+
+ /* Reset device status. */
+ memset(&cdev->private->irb, 0, sizeof(struct irb));
+
+ /* Try multiple times. */
+ ret = -ENODEV;
+ if (cdev->private->iretry > 0) {
+ cdev->private->iretry--;
+ ret = cio_start (sch, cdev->private->iccws,
+ cdev->private->imask);
+ /* ret is 0, -EBUSY, -EACCES or -ENODEV */
+ if ((ret != -EACCES) && (ret != -ENODEV))
+ return ret;
+ }
+ /* nop command failed on this path. Switch it off. */
+ sch->lpm &= ~cdev->private->imask;
+ sch->vpm &= ~cdev->private->imask;
+ CIO_MSG_EVENT(2, "NOP - Device %04x on Subchannel "
+ "0.%x.%04x, lpm %02X, became 'not operational'\n",
+ cdev->private->devno, sch->schid.ssid,
+ sch->schid.sch_no, cdev->private->imask);
+ return ret;
+}
+
+
+/*
* Called from interrupt context to check if a valid answer
* to Set Path Group ID was received.
*/
@@ -282,6 +330,29 @@ __ccw_device_check_pgid(struct ccw_device *cdev)
return 0;
}
+/*
+ * Called from interrupt context to check the path status after a nop has
+ * been send.
+ */
+static int __ccw_device_check_nop(struct ccw_device *cdev)
+{
+ struct subchannel *sch;
+ struct irb *irb;
+
+ sch = to_subchannel(cdev->dev.parent);
+ irb = &cdev->private->irb;
+ if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
+ return -ETIME;
+ if (irb->scsw.cc == 3) {
+ CIO_MSG_EVENT(2, "NOP - Device %04x on Subchannel 0.%x.%04x,"
+ " lpm %02X, became 'not operational'\n",
+ cdev->private->devno, sch->schid.ssid,
+ sch->schid.sch_no, cdev->private->imask);
+ return -EACCES;
+ }
+ return 0;
+}
+
static void
__ccw_device_verify_start(struct ccw_device *cdev)
{
@@ -296,9 +367,12 @@ __ccw_device_verify_start(struct ccw_device *cdev)
if ((sch->vpm & imask) != (sch->lpm & imask))
break;
cdev->private->imask = imask;
- func = (sch->vpm & imask) ?
- SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH;
- ret = __ccw_device_do_pgid(cdev, func);
+ if (cdev->private->options.pgroup) {
+ func = (sch->vpm & imask) ?
+ SPID_FUNC_RESIGN : SPID_FUNC_ESTABLISH;
+ ret = __ccw_device_do_pgid(cdev, func);
+ } else
+ ret = __ccw_device_do_nop(cdev);
if (ret == 0 || ret == -EBUSY)
return;
cdev->private->iretry = 5;
@@ -327,7 +401,10 @@ ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
return;
sch = to_subchannel(cdev->dev.parent);
- ret = __ccw_device_check_pgid(cdev);
+ if (cdev->private->options.pgroup)
+ ret = __ccw_device_check_pgid(cdev);
+ else
+ ret = __ccw_device_check_nop(cdev);
memset(&cdev->private->irb, 0, sizeof(struct irb));
switch (ret) {
/* 0, -ETIME, -EAGAIN, -EOPNOTSUPP or -EACCES */
@@ -345,11 +422,10 @@ ccw_device_verify_irq(struct ccw_device *cdev, enum dev_event dev_event)
* One of those strange devices which claim to be able
* to do multipathing but not for Set Path Group ID.
*/
- if (cdev->private->flags.pgid_single) {
- ccw_device_verify_done(cdev, -EOPNOTSUPP);
- break;
- }
- cdev->private->flags.pgid_single = 1;
+ if (cdev->private->flags.pgid_single)
+ cdev->private->options.pgroup = 0;
+ else
+ cdev->private->flags.pgid_single = 1;
/* fall through. */
case -EAGAIN: /* Try again. */
__ccw_device_verify_start(cdev);
diff --git a/drivers/s390/cio/device_status.c b/drivers/s390/cio/device_status.c
index 14bef2c179b..caf148d5caa 100644
--- a/drivers/s390/cio/device_status.c
+++ b/drivers/s390/cio/device_status.c
@@ -67,8 +67,7 @@ ccw_device_path_notoper(struct ccw_device *cdev)
sch->schib.pmcw.pnom);
sch->lpm &= ~sch->schib.pmcw.pnom;
- if (cdev->private->options.pgroup)
- cdev->private->flags.doverify = 1;
+ cdev->private->flags.doverify = 1;
}
/*
@@ -180,7 +179,7 @@ ccw_device_accumulate_esw(struct ccw_device *cdev, struct irb *irb)
cdev_irb->esw.esw0.erw.auth = irb->esw.esw0.erw.auth;
/* Copy path verification required flag. */
cdev_irb->esw.esw0.erw.pvrf = irb->esw.esw0.erw.pvrf;
- if (irb->esw.esw0.erw.pvrf && cdev->private->options.pgroup)
+ if (irb->esw.esw0.erw.pvrf)
cdev->private->flags.doverify = 1;
/* Copy concurrent sense bit. */
cdev_irb->esw.esw0.erw.cons = irb->esw.esw0.erw.cons;
@@ -354,7 +353,7 @@ ccw_device_accumulate_basic_sense(struct ccw_device *cdev, struct irb *irb)
}
/* Check if path verification is required. */
if (ccw_device_accumulate_esw_valid(irb) &&
- irb->esw.esw0.erw.pvrf && cdev->private->options.pgroup)
+ irb->esw.esw0.erw.pvrf)
cdev->private->flags.doverify = 1;
}
diff --git a/drivers/s390/s390mach.c b/drivers/s390/s390mach.c
index ffb3677e354..5399c5d99b8 100644
--- a/drivers/s390/s390mach.c
+++ b/drivers/s390/s390mach.c
@@ -111,6 +111,16 @@ repeat:
break;
case CRW_RSC_CPATH:
pr_debug("source is channel path %02X\n", crw[0].rsid);
+ /*
+ * Check for solicited machine checks. These are
+ * created by reset channel path and need not be
+ * reported to the common I/O layer.
+ */
+ if (crw[chain].slct) {
+ DBG(KERN_INFO"solicited machine check for "
+ "channel path %02X\n", crw[0].rsid);
+ break;
+ }
switch (crw[0].erc) {
case CRW_ERC_IPARM: /* Path has come. */
ret = chp_process_crw(crw[0].rsid, 1);
diff --git a/include/asm-s390/cio.h b/include/asm-s390/cio.h
index 2b161930635..28fdd6e2b8b 100644
--- a/include/asm-s390/cio.h
+++ b/include/asm-s390/cio.h
@@ -276,6 +276,8 @@ extern void wait_cons_dev(void);
extern void clear_all_subchannels(void);
+extern void cio_reset_channel_paths(void);
+
extern void css_schedule_reprobe(void);
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 12:38:08 +0000