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-rw-r--r--drivers/s390/block/dasd.c202
-rw-r--r--drivers/s390/block/dasd_3990_erp.c16
-rw-r--r--drivers/s390/block/dasd_devmap.c1
-rw-r--r--drivers/s390/block/dasd_diag.c1
-rw-r--r--drivers/s390/block/dasd_eckd.c261
-rw-r--r--drivers/s390/block/dasd_eckd.h9
-rw-r--r--drivers/s390/block/dasd_erp.c3
-rw-r--r--drivers/s390/block/dasd_fba.c3
-rw-r--r--drivers/s390/block/dasd_int.h22
9 files changed, 418 insertions, 100 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 605f96f154a..8f2067bc88c 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -913,6 +913,11 @@ int dasd_start_IO(struct dasd_ccw_req *cqr)
cqr->startclk = get_clock();
cqr->starttime = jiffies;
cqr->retries--;
+ if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
+ cqr->lpm &= device->path_data.opm;
+ if (!cqr->lpm)
+ cqr->lpm = device->path_data.opm;
+ }
if (cqr->cpmode == 1) {
rc = ccw_device_tm_start(device->cdev, cqr->cpaddr,
(long) cqr, cqr->lpm);
@@ -925,35 +930,53 @@ int dasd_start_IO(struct dasd_ccw_req *cqr)
cqr->status = DASD_CQR_IN_IO;
break;
case -EBUSY:
- DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"start_IO: device busy, retry later");
break;
case -ETIMEDOUT:
- DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"start_IO: request timeout, retry later");
break;
case -EACCES:
- /* -EACCES indicates that the request used only a
- * subset of the available pathes and all these
- * pathes are gone.
- * Do a retry with all available pathes.
+ /* -EACCES indicates that the request used only a subset of the
+ * available paths and all these paths are gone. If the lpm of
+ * this request was only a subset of the opm (e.g. the ppm) then
+ * we just do a retry with all available paths.
+ * If we already use the full opm, something is amiss, and we
+ * need a full path verification.
*/
- cqr->lpm = LPM_ANYPATH;
- DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
- "start_IO: selected pathes gone,"
- " retry on all pathes");
+ if (test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags)) {
+ DBF_DEV_EVENT(DBF_WARNING, device,
+ "start_IO: selected paths gone (%x)",
+ cqr->lpm);
+ } else if (cqr->lpm != device->path_data.opm) {
+ cqr->lpm = device->path_data.opm;
+ DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
+ "start_IO: selected paths gone,"
+ " retry on all paths");
+ } else {
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+ "start_IO: all paths in opm gone,"
+ " do path verification");
+ dasd_generic_last_path_gone(device);
+ device->path_data.opm = 0;
+ device->path_data.ppm = 0;
+ device->path_data.npm = 0;
+ device->path_data.tbvpm =
+ ccw_device_get_path_mask(device->cdev);
+ }
break;
case -ENODEV:
- DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"start_IO: -ENODEV device gone, retry");
break;
case -EIO:
- DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"start_IO: -EIO device gone, retry");
break;
case -EINVAL:
/* most likely caused in power management context */
- DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"start_IO: -EINVAL device currently "
"not accessible");
break;
@@ -1175,12 +1198,13 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
*/
if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
cqr->retries > 0) {
- if (cqr->lpm == LPM_ANYPATH)
+ if (cqr->lpm == device->path_data.opm)
DBF_DEV_EVENT(DBF_DEBUG, device,
"default ERP in fastpath "
"(%i retries left)",
cqr->retries);
- cqr->lpm = LPM_ANYPATH;
+ if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
+ cqr->lpm = device->path_data.opm;
cqr->status = DASD_CQR_QUEUED;
next = cqr;
} else
@@ -1364,8 +1388,14 @@ static void __dasd_device_start_head(struct dasd_device *device)
cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, devlist);
if (cqr->status != DASD_CQR_QUEUED)
return;
- /* when device is stopped, return request to previous layer */
- if (device->stopped) {
+ /* when device is stopped, return request to previous layer
+ * exception: only the disconnect or unresumed bits are set and the
+ * cqr is a path verification request
+ */
+ if (device->stopped &&
+ !(!(device->stopped & ~(DASD_STOPPED_DC_WAIT | DASD_UNRESUMED_PM))
+ && test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))) {
+ cqr->intrc = -EAGAIN;
cqr->status = DASD_CQR_CLEARED;
dasd_schedule_device_bh(device);
return;
@@ -1381,6 +1411,23 @@ static void __dasd_device_start_head(struct dasd_device *device)
dasd_device_set_timer(device, 50);
}
+static void __dasd_device_check_path_events(struct dasd_device *device)
+{
+ int rc;
+
+ if (device->path_data.tbvpm) {
+ if (device->stopped & ~(DASD_STOPPED_DC_WAIT |
+ DASD_UNRESUMED_PM))
+ return;
+ rc = device->discipline->verify_path(
+ device, device->path_data.tbvpm);
+ if (rc)
+ dasd_device_set_timer(device, 50);
+ else
+ device->path_data.tbvpm = 0;
+ }
+};
+
/*
* Go through all request on the dasd_device request queue,
* terminate them on the cdev if necessary, and return them to the
@@ -1455,6 +1502,7 @@ static void dasd_device_tasklet(struct dasd_device *device)
__dasd_device_check_expire(device);
/* find final requests on ccw queue */
__dasd_device_process_ccw_queue(device, &final_queue);
+ __dasd_device_check_path_events(device);
spin_unlock_irq(get_ccwdev_lock(device->cdev));
/* Now call the callback function of requests with final status */
__dasd_device_process_final_queue(device, &final_queue);
@@ -2586,10 +2634,53 @@ int dasd_generic_set_offline(struct ccw_device *cdev)
return 0;
}
+int dasd_generic_last_path_gone(struct dasd_device *device)
+{
+ struct dasd_ccw_req *cqr;
+
+ dev_warn(&device->cdev->dev, "No operational channel path is left "
+ "for the device\n");
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
+ /* First of all call extended error reporting. */
+ dasd_eer_write(device, NULL, DASD_EER_NOPATH);
+
+ if (device->state < DASD_STATE_BASIC)
+ return 0;
+ /* Device is active. We want to keep it. */
+ list_for_each_entry(cqr, &device->ccw_queue, devlist)
+ if ((cqr->status == DASD_CQR_IN_IO) ||
+ (cqr->status == DASD_CQR_CLEAR_PENDING)) {
+ cqr->status = DASD_CQR_QUEUED;
+ cqr->retries++;
+ }
+ dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
+ dasd_device_clear_timer(device);
+ dasd_schedule_device_bh(device);
+ return 1;
+}
+EXPORT_SYMBOL_GPL(dasd_generic_last_path_gone);
+
+int dasd_generic_path_operational(struct dasd_device *device)
+{
+ dev_info(&device->cdev->dev, "A channel path to the device has become "
+ "operational\n");
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s", "path operational");
+ dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
+ if (device->stopped & DASD_UNRESUMED_PM) {
+ dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
+ dasd_restore_device(device);
+ return 1;
+ }
+ dasd_schedule_device_bh(device);
+ if (device->block)
+ dasd_schedule_block_bh(device->block);
+ return 1;
+}
+EXPORT_SYMBOL_GPL(dasd_generic_path_operational);
+
int dasd_generic_notify(struct ccw_device *cdev, int event)
{
struct dasd_device *device;
- struct dasd_ccw_req *cqr;
int ret;
device = dasd_device_from_cdev_locked(cdev);
@@ -2600,41 +2691,64 @@ int dasd_generic_notify(struct ccw_device *cdev, int event)
case CIO_GONE:
case CIO_BOXED:
case CIO_NO_PATH:
- /* First of all call extended error reporting. */
- dasd_eer_write(device, NULL, DASD_EER_NOPATH);
-
- if (device->state < DASD_STATE_BASIC)
- break;
- /* Device is active. We want to keep it. */
- list_for_each_entry(cqr, &device->ccw_queue, devlist)
- if (cqr->status == DASD_CQR_IN_IO) {
- cqr->status = DASD_CQR_QUEUED;
- cqr->retries++;
- }
- dasd_device_set_stop_bits(device, DASD_STOPPED_DC_WAIT);
- dasd_device_clear_timer(device);
- dasd_schedule_device_bh(device);
- ret = 1;
+ device->path_data.opm = 0;
+ device->path_data.ppm = 0;
+ device->path_data.npm = 0;
+ ret = dasd_generic_last_path_gone(device);
break;
case CIO_OPER:
- /* FIXME: add a sanity check. */
- dasd_device_remove_stop_bits(device, DASD_STOPPED_DC_WAIT);
- if (device->stopped & DASD_UNRESUMED_PM) {
- dasd_device_remove_stop_bits(device, DASD_UNRESUMED_PM);
- dasd_restore_device(device);
- ret = 1;
- break;
- }
- dasd_schedule_device_bh(device);
- if (device->block)
- dasd_schedule_block_bh(device->block);
ret = 1;
+ if (device->path_data.opm)
+ ret = dasd_generic_path_operational(device);
break;
}
dasd_put_device(device);
return ret;
}
+void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
+{
+ int chp;
+ __u8 oldopm, eventlpm;
+ struct dasd_device *device;
+
+ device = dasd_device_from_cdev_locked(cdev);
+ if (IS_ERR(device))
+ return;
+ for (chp = 0; chp < 8; chp++) {
+ eventlpm = 0x80 >> chp;
+ if (path_event[chp] & PE_PATH_GONE) {
+ oldopm = device->path_data.opm;
+ device->path_data.opm &= ~eventlpm;
+ device->path_data.ppm &= ~eventlpm;
+ device->path_data.npm &= ~eventlpm;
+ if (oldopm && !device->path_data.opm)
+ dasd_generic_last_path_gone(device);
+ }
+ if (path_event[chp] & PE_PATH_AVAILABLE) {
+ device->path_data.opm &= ~eventlpm;
+ device->path_data.ppm &= ~eventlpm;
+ device->path_data.npm &= ~eventlpm;
+ device->path_data.tbvpm |= eventlpm;
+ dasd_schedule_device_bh(device);
+ }
+ }
+ dasd_put_device(device);
+}
+EXPORT_SYMBOL_GPL(dasd_generic_path_event);
+
+int dasd_generic_verify_path(struct dasd_device *device, __u8 lpm)
+{
+ if (!device->path_data.opm && lpm) {
+ device->path_data.opm = lpm;
+ dasd_generic_path_operational(device);
+ } else
+ device->path_data.opm |= lpm;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
+
+
int dasd_generic_pm_freeze(struct ccw_device *cdev)
{
struct dasd_ccw_req *cqr, *n;
diff --git a/drivers/s390/block/dasd_3990_erp.c b/drivers/s390/block/dasd_3990_erp.c
index 968c76cf712..1654a24817b 100644
--- a/drivers/s390/block/dasd_3990_erp.c
+++ b/drivers/s390/block/dasd_3990_erp.c
@@ -152,9 +152,9 @@ dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp)
spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
opm = ccw_device_get_path_mask(device->cdev);
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
- //FIXME: start with get_opm ?
if (erp->lpm == 0)
- erp->lpm = LPM_ANYPATH & ~(erp->irb.esw.esw0.sublog.lpum);
+ erp->lpm = device->path_data.opm &
+ ~(erp->irb.esw.esw0.sublog.lpum);
else
erp->lpm &= ~(erp->irb.esw.esw0.sublog.lpum);
@@ -270,10 +270,11 @@ static struct dasd_ccw_req *dasd_3990_erp_action_1(struct dasd_ccw_req *erp)
{
erp->function = dasd_3990_erp_action_1;
dasd_3990_erp_alternate_path(erp);
- if (erp->status == DASD_CQR_FAILED) {
+ if (erp->status == DASD_CQR_FAILED &&
+ !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
erp->status = DASD_CQR_FILLED;
erp->retries = 10;
- erp->lpm = LPM_ANYPATH;
+ erp->lpm = erp->startdev->path_data.opm;
erp->function = dasd_3990_erp_action_1_sec;
}
return erp;
@@ -1907,15 +1908,14 @@ dasd_3990_erp_compound_retry(struct dasd_ccw_req * erp, char *sense)
static void
dasd_3990_erp_compound_path(struct dasd_ccw_req * erp, char *sense)
{
-
if (sense[25] & DASD_SENSE_BIT_3) {
dasd_3990_erp_alternate_path(erp);
- if (erp->status == DASD_CQR_FAILED) {
+ if (erp->status == DASD_CQR_FAILED &&
+ !test_bit(DASD_CQR_VERIFY_PATH, &erp->flags)) {
/* reset the lpm and the status to be able to
* try further actions. */
-
- erp->lpm = 0;
+ erp->lpm = erp->startdev->path_data.opm;
erp->status = DASD_CQR_NEED_ERP;
}
}
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c
index 8d41f3ed38d..0001df8ad3e 100644
--- a/drivers/s390/block/dasd_devmap.c
+++ b/drivers/s390/block/dasd_devmap.c
@@ -639,6 +639,7 @@ dasd_put_device_wake(struct dasd_device *device)
{
wake_up(&dasd_delete_wq);
}
+EXPORT_SYMBOL_GPL(dasd_put_device_wake);
/*
* Return dasd_device structure associated with cdev.
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index a3a5db58df1..29143eda9dd 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -619,6 +619,7 @@ static struct dasd_discipline dasd_diag_discipline = {
.ebcname = "DIAG",
.max_blocks = DIAG_MAX_BLOCKS,
.check_device = dasd_diag_check_device,
+ .verify_path = dasd_generic_verify_path,
.fill_geometry = dasd_diag_fill_geometry,
.start_IO = dasd_start_diag,
.term_IO = dasd_diag_term_IO,
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 549443af121..a1ebf5722ae 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -90,6 +90,18 @@ static struct {
} *dasd_reserve_req;
static DEFINE_MUTEX(dasd_reserve_mutex);
+/* definitions for the path verification worker */
+struct path_verification_work_data {
+ struct work_struct worker;
+ struct dasd_device *device;
+ struct dasd_ccw_req cqr;
+ struct ccw1 ccw;
+ __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
+ int isglobal;
+ __u8 tbvpm;
+};
+static struct path_verification_work_data *path_verification_worker;
+static DEFINE_MUTEX(dasd_path_verification_mutex);
/* initial attempt at a probe function. this can be simplified once
* the other detection code is gone */
@@ -755,26 +767,27 @@ static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
return -EINVAL;
}
-static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
- void *rcd_buffer,
- struct ciw *ciw, __u8 lpm)
+static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
+ struct dasd_ccw_req *cqr,
+ __u8 *rcd_buffer,
+ __u8 lpm)
{
- struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
-
- cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */, ciw->count,
- device);
-
- if (IS_ERR(cqr)) {
- DBF_DEV_EVENT(DBF_WARNING, device, "%s",
- "Could not allocate RCD request");
- return cqr;
- }
+ /*
+ * buffer has to start with EBCDIC "V1.0" to show
+ * support for virtual device SNEQ
+ */
+ rcd_buffer[0] = 0xE5;
+ rcd_buffer[1] = 0xF1;
+ rcd_buffer[2] = 0x4B;
+ rcd_buffer[3] = 0xF0;
ccw = cqr->cpaddr;
- ccw->cmd_code = ciw->cmd;
+ ccw->cmd_code = DASD_ECKD_CCW_RCD;
+ ccw->flags = 0;
ccw->cda = (__u32)(addr_t)rcd_buffer;
- ccw->count = ciw->count;
+ ccw->count = DASD_ECKD_RCD_DATA_SIZE;
+ cqr->magic = DASD_ECKD_MAGIC;
cqr->startdev = device;
cqr->memdev = device;
@@ -784,7 +797,29 @@ static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
cqr->retries = 256;
cqr->buildclk = get_clock();
cqr->status = DASD_CQR_FILLED;
- return cqr;
+ set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
+}
+
+static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
+ struct dasd_ccw_req *cqr,
+ __u8 *rcd_buffer,
+ __u8 lpm)
+{
+ struct ciw *ciw;
+ int rc;
+ /*
+ * sanity check: scan for RCD command in extended SenseID data
+ * some devices do not support RCD
+ */
+ ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
+ if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
+ return -EOPNOTSUPP;
+
+ dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
+ clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
+ cqr->retries = 5;
+ rc = dasd_sleep_on_immediatly(cqr);
+ return rc;
}
static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
@@ -797,32 +832,29 @@ static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
struct dasd_ccw_req *cqr;
/*
- * scan for RCD command in extended SenseID data
+ * sanity check: scan for RCD command in extended SenseID data
+ * some devices do not support RCD
*/
ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
- if (!ciw || ciw->cmd == 0) {
+ if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
ret = -EOPNOTSUPP;
goto out_error;
}
- rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
+ rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
if (!rcd_buf) {
ret = -ENOMEM;
goto out_error;
}
-
- /*
- * buffer has to start with EBCDIC "V1.0" to show
- * support for virtual device SNEQ
- */
- rcd_buf[0] = 0xE5;
- rcd_buf[1] = 0xF1;
- rcd_buf[2] = 0x4B;
- rcd_buf[3] = 0xF0;
- cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
+ cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
+ 0, /* use rcd_buf as data ara */
+ device);
if (IS_ERR(cqr)) {
- ret = PTR_ERR(cqr);
+ DBF_DEV_EVENT(DBF_WARNING, device, "%s",
+ "Could not allocate RCD request");
+ ret = -ENOMEM;
goto out_error;
}
+ dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
ret = dasd_sleep_on(cqr);
/*
* on success we update the user input parms
@@ -831,7 +863,7 @@ static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
if (ret)
goto out_error;
- *rcd_buffer_size = ciw->count;
+ *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
*rcd_buffer = rcd_buf;
return 0;
out_error:
@@ -901,18 +933,18 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
void *conf_data;
int conf_len, conf_data_saved;
int rc;
- __u8 lpm;
+ __u8 lpm, opm;
struct dasd_eckd_private *private;
- struct dasd_eckd_path *path_data;
+ struct dasd_path *path_data;
private = (struct dasd_eckd_private *) device->private;
- path_data = (struct dasd_eckd_path *) &private->path_data;
- path_data->opm = ccw_device_get_path_mask(device->cdev);
+ path_data = &device->path_data;
+ opm = ccw_device_get_path_mask(device->cdev);
lpm = 0x80;
conf_data_saved = 0;
/* get configuration data per operational path */
for (lpm = 0x80; lpm; lpm>>= 1) {
- if (lpm & path_data->opm){
+ if (lpm & opm) {
rc = dasd_eckd_read_conf_lpm(device, &conf_data,
&conf_len, lpm);
if (rc && rc != -EOPNOTSUPP) { /* -EOPNOTSUPP is ok */
@@ -925,6 +957,8 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
"No configuration data "
"retrieved");
+ /* no further analysis possible */
+ path_data->opm |= lpm;
continue; /* no error */
}
/* save first valid configuration data */
@@ -948,6 +982,7 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
path_data->ppm |= lpm;
break;
}
+ path_data->opm |= lpm;
if (conf_data != private->conf_data)
kfree(conf_data);
}
@@ -955,6 +990,140 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
return 0;
}
+static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
+{
+ struct dasd_eckd_private *private;
+ int mdc;
+ u32 fcx_max_data;
+
+ private = (struct dasd_eckd_private *) device->private;
+ if (private->fcx_max_data) {
+ mdc = ccw_device_get_mdc(device->cdev, lpm);
+ if ((mdc < 0)) {
+ dev_warn(&device->cdev->dev,
+ "Detecting the maximum data size for zHPF "
+ "requests failed (rc=%d) for a new path %x\n",
+ mdc, lpm);
+ return mdc;
+ }
+ fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
+ if (fcx_max_data < private->fcx_max_data) {
+ dev_warn(&device->cdev->dev,
+ "The maximum data size for zHPF requests %u "
+ "on a new path %x is below the active maximum "
+ "%u\n", fcx_max_data, lpm,
+ private->fcx_max_data);
+ return -EACCES;
+ }
+ }
+ return 0;
+}
+
+static void do_path_verification_work(struct work_struct *work)
+{
+ struct path_verification_work_data *data;
+ struct dasd_device *device;
+ __u8 lpm, opm, npm, ppm, epm;
+ unsigned long flags;
+ int rc;
+
+ data = container_of(work, struct path_verification_work_data, worker);
+ device = data->device;
+
+ opm = 0;
+ npm = 0;
+ ppm = 0;
+ epm = 0;
+ for (lpm = 0x80; lpm; lpm >>= 1) {
+ if (lpm & data->tbvpm) {
+ memset(data->rcd_buffer, 0, sizeof(data->rcd_buffer));
+ memset(&data->cqr, 0, sizeof(data->cqr));
+ data->cqr.cpaddr = &data->ccw;
+ rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
+ data->rcd_buffer,
+ lpm);
+ if (!rc) {
+ switch (dasd_eckd_path_access(data->rcd_buffer,
+ DASD_ECKD_RCD_DATA_SIZE)) {
+ case 0x02:
+ npm |= lpm;
+ break;
+ case 0x03:
+ ppm |= lpm;
+ break;
+ }
+ opm |= lpm;
+ } else if (rc == -EOPNOTSUPP) {
+ DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
+ "path verification: No configuration "
+ "data retrieved");
+ opm |= lpm;
+ } else if (rc == -EAGAIN) {
+ DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
+ "path verification: device is stopped,"
+ " try again later");
+ epm |= lpm;
+ } else {
+ dev_warn(&device->cdev->dev,
+ "Reading device feature codes failed "
+ "(rc=%d) for new path %x\n", rc, lpm);
+ continue;
+ }
+ if (verify_fcx_max_data(device, lpm)) {
+ opm &= ~lpm;
+ npm &= ~lpm;
+ ppm &= ~lpm;
+ }
+ }
+ }
+ /*
+ * There is a small chance that a path is lost again between
+ * above path verification and the following modification of
+ * the device opm mask. We could avoid that race here by using
+ * yet another path mask, but we rather deal with this unlikely
+ * situation in dasd_start_IO.
+ */
+ spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
+ if (!device->path_data.opm && opm) {
+ device->path_data.opm = opm;
+ dasd_generic_path_operational(device);
+ } else
+ device->path_data.opm |= opm;
+ device->path_data.npm |= npm;
+ device->path_data.ppm |= ppm;
+ device->path_data.tbvpm |= epm;
+ spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
+
+ dasd_put_device(device);
+ if (data->isglobal)
+ mutex_unlock(&dasd_path_verification_mutex);
+ else
+ kfree(data);
+}
+
+static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
+{
+ struct path_verification_work_data *data;
+
+ data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
+ if (!data) {
+ if (mutex_trylock(&dasd_path_verification_mutex)) {
+ data = path_verification_worker;
+ data->isglobal = 1;
+ } else
+ return -ENOMEM;
+ } else {
+ memset(data, 0, sizeof(*data));
+ data->isglobal = 0;
+ }
+ INIT_WORK(&data->worker, do_path_verification_work);
+ dasd_get_device(device);
+ data->device = device;
+ data->tbvpm = lpm;
+ schedule_work(&data->worker);
+ return 0;
+}
+
static int dasd_eckd_read_features(struct dasd_device *device)
{
struct dasd_psf_prssd_data *prssdp;
@@ -1749,6 +1918,7 @@ static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
if (cqr->block && (cqr->startdev != cqr->block->base)) {
dasd_eckd_reset_ccw_to_base_io(cqr);
cqr->startdev = cqr->block->base;
+ cqr->lpm = cqr->block->base->path_data.opm;
}
};
@@ -2017,7 +2187,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
cqr->memdev = startdev;
cqr->block = block;
cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
- cqr->lpm = private->path_data.ppm;
+ cqr->lpm = startdev->path_data.ppm;
cqr->retries = 256;
cqr->buildclk = get_clock();
cqr->status = DASD_CQR_FILLED;
@@ -2194,7 +2364,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
cqr->memdev = startdev;
cqr->block = block;
cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
- cqr->lpm = private->path_data.ppm;
+ cqr->lpm = startdev->path_data.ppm;
cqr->retries = 256;
cqr->buildclk = get_clock();
cqr->status = DASD_CQR_FILLED;
@@ -2484,7 +2654,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
cqr->memdev = startdev;
cqr->block = block;
cqr->expires = startdev->default_expires * HZ; /* default 5 minutes */
- cqr->lpm = private->path_data.ppm;
+ cqr->lpm = startdev->path_data.ppm;
cqr->retries = 256;
cqr->buildclk = get_clock();
cqr->status = DASD_CQR_FILLED;
@@ -3624,6 +3794,7 @@ static struct ccw_driver dasd_eckd_driver = {
.set_offline = dasd_generic_set_offline,
.set_online = dasd_eckd_set_online,
.notify = dasd_generic_notify,
+ .path_event = dasd_generic_path_event,
.freeze = dasd_generic_pm_freeze,
.thaw = dasd_generic_restore_device,
.restore = dasd_generic_restore_device,
@@ -3651,6 +3822,7 @@ static struct dasd_discipline dasd_eckd_discipline = {
.check_device = dasd_eckd_check_characteristics,
.uncheck_device = dasd_eckd_uncheck_device,
.do_analysis = dasd_eckd_do_analysis,
+ .verify_path = dasd_eckd_verify_path,
.ready_to_online = dasd_eckd_ready_to_online,
.online_to_ready = dasd_eckd_online_to_ready,
.fill_geometry = dasd_eckd_fill_geometry,
@@ -3683,11 +3855,19 @@ dasd_eckd_init(void)
GFP_KERNEL | GFP_DMA);
if (!dasd_reserve_req)
return -ENOMEM;
+ path_verification_worker = kmalloc(sizeof(*path_verification_worker),
+ GFP_KERNEL | GFP_DMA);
+ if (!path_verification_worker) {
+ kfree(dasd_reserve_req);
+ return -ENOMEM;
+ }
ret = ccw_driver_register(&dasd_eckd_driver);
if (!ret)
wait_for_device_probe();
- else
+ else {
+ kfree(path_verification_worker);
kfree(dasd_reserve_req);
+ }
return ret;
}
@@ -3695,6 +3875,7 @@ static void __exit
dasd_eckd_cleanup(void)
{
ccw_driver_unregister(&dasd_eckd_driver);
+ kfree(path_verification_worker);
kfree(dasd_reserve_req);
}
diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h
index 2150aed541b..5051f374cbc 100644
--- a/drivers/s390/block/dasd_eckd.h
+++ b/drivers/s390/block/dasd_eckd.h
@@ -45,6 +45,7 @@
#define DASD_ECKD_CCW_PFX 0xE7
#define DASD_ECKD_CCW_PFX_READ 0xEA
#define DASD_ECKD_CCW_RSCK 0xF9
+#define DASD_ECKD_CCW_RCD 0xFA
/*
* Perform Subsystem Function / Sub-Orders
@@ -59,6 +60,7 @@
#define FCX_MAX_DATA_FACTOR 65536
+#define DASD_ECKD_RCD_DATA_SIZE 256
/*****************************************************************************
@@ -335,12 +337,6 @@ struct dasd_gneq {
__u8 reserved2[22];
} __attribute__ ((packed));
-struct dasd_eckd_path {
- __u8 opm;
- __u8 ppm;
- __u8 npm;
-};
-
struct dasd_rssd_features {
char feature[256];
} __attribute__((packed));
@@ -446,7 +442,6 @@ struct dasd_eckd_private {
struct vd_sneq *vdsneq;
struct dasd_gneq *gneq;
- struct dasd_eckd_path path_data;
struct eckd_count count_area[5];
int init_cqr_status;
int uses_cdl;
diff --git a/drivers/s390/block/dasd_erp.c b/drivers/s390/block/dasd_erp.c
index 7656384a811..0eafe2e421e 100644
--- a/drivers/s390/block/dasd_erp.c
+++ b/drivers/s390/block/dasd_erp.c
@@ -96,7 +96,8 @@ dasd_default_erp_action(struct dasd_ccw_req *cqr)
DBF_DEV_EVENT(DBF_DEBUG, device,
"default ERP called (%i retries left)",
cqr->retries);
- cqr->lpm = LPM_ANYPATH;
+ if (!test_bit(DASD_CQR_VERIFY_PATH, &cqr->flags))
+ cqr->lpm = device->path_data.opm;
cqr->status = DASD_CQR_FILLED;
} else {
pr_err("%s: default ERP has run out of retries and failed\n",
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index bec5486e0e6..86bacda2c5f 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -73,6 +73,7 @@ static struct ccw_driver dasd_fba_driver = {
.set_offline = dasd_generic_set_offline,
.set_online = dasd_fba_set_online,
.notify = dasd_generic_notify,
+ .path_event = dasd_generic_path_event,
.freeze = dasd_generic_pm_freeze,
.thaw = dasd_generic_restore_device,
.restore = dasd_generic_restore_device,
@@ -164,6 +165,7 @@ dasd_fba_check_characteristics(struct dasd_device *device)
}
device->default_expires = DASD_EXPIRES;
+ device->path_data.opm = LPM_ANYPATH;
readonly = dasd_device_is_ro(device);
if (readonly)
@@ -596,6 +598,7 @@ static struct dasd_discipline dasd_fba_discipline = {
.max_blocks = 96,
.check_device = dasd_fba_check_characteristics,
.do_analysis = dasd_fba_do_analysis,
+ .verify_path = dasd_generic_verify_path,
.fill_geometry = dasd_fba_fill_geometry,
.start_IO = dasd_start_IO,
.term_IO = dasd_term_IO,
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index 500678d7116..ba038ef5760 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -231,6 +231,7 @@ struct dasd_ccw_req {
/* per dasd_ccw_req flags */
#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
+#define DASD_CQR_VERIFY_PATH 2 /* path verification request */
/* Signature for error recovery functions. */
typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
@@ -287,6 +288,14 @@ struct dasd_discipline {
int (*do_analysis) (struct dasd_block *);
/*
+ * This function is called, when new paths become available.
+ * Disciplins may use this callback to do necessary setup work,
+ * e.g. verify that new path is compatible with the current
+ * configuration.
+ */
+ int (*verify_path)(struct dasd_device *, __u8);
+
+ /*
* Last things to do when a device is set online, and first things
* when it is set offline.
*/
@@ -362,6 +371,13 @@ extern struct dasd_discipline *dasd_diag_discipline_pointer;
#define DASD_EER_STATECHANGE 3
#define DASD_EER_PPRCSUSPEND 4
+struct dasd_path {
+ __u8 opm;
+ __u8 tbvpm;
+ __u8 ppm;
+ __u8 npm;
+};
+
struct dasd_device {
/* Block device stuff. */
struct dasd_block *block;
@@ -377,6 +393,7 @@ struct dasd_device {
struct dasd_discipline *discipline;
struct dasd_discipline *base_discipline;
char *private;
+ struct dasd_path path_data;
/* Device state and target state. */
int state, target;
@@ -620,10 +637,15 @@ void dasd_generic_remove (struct ccw_device *cdev);
int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
int dasd_generic_set_offline (struct ccw_device *cdev);
int dasd_generic_notify(struct ccw_device *, int);
+int dasd_generic_last_path_gone(struct dasd_device *);
+int dasd_generic_path_operational(struct dasd_device *);
+
void dasd_generic_handle_state_change(struct dasd_device *);
int dasd_generic_pm_freeze(struct ccw_device *);
int dasd_generic_restore_device(struct ccw_device *);
enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
+void dasd_generic_path_event(struct ccw_device *, int *);
+int dasd_generic_verify_path(struct dasd_device *, __u8);
int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
char *dasd_get_sense(struct irb *);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-30 12:46:46 +0000