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path: root/drivers/s390/block/dasd_eckd.c
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Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
-rw-r--r--drivers/s390/block/dasd_eckd.c333
1 files changed, 252 insertions, 81 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 6215f6455..62a323539 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1036,7 +1036,7 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
{
void *conf_data;
int conf_len, conf_data_saved;
- int rc, path_err;
+ int rc, path_err, pos;
__u8 lpm, opm;
struct dasd_eckd_private *private, path_private;
struct dasd_path *path_data;
@@ -1068,6 +1068,17 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
path_data->opm |= lpm;
continue; /* no error */
}
+ /* translate path mask to position in mask */
+ pos = 8 - ffs(lpm);
+ kfree(private->path_conf_data[pos]);
+ if ((__u8 *)private->path_conf_data[pos] ==
+ private->conf_data) {
+ private->conf_data = NULL;
+ private->conf_len = 0;
+ conf_data_saved = 0;
+ }
+ private->path_conf_data[pos] =
+ (struct dasd_conf_data *) conf_data;
/* save first valid configuration data */
if (!conf_data_saved) {
kfree(private->conf_data);
@@ -1095,7 +1106,6 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
kfree(conf_data);
continue;
}
-
if (dasd_eckd_compare_path_uid(
device, &path_private)) {
uid = &path_private.uid;
@@ -1157,9 +1167,6 @@ static int dasd_eckd_read_conf(struct dasd_device *device)
path_data->cablepm &= ~lpm;
path_data->hpfpm &= ~lpm;
path_data->cuirpm &= ~lpm;
-
- if (conf_data != private->conf_data)
- kfree(conf_data);
}
return path_err;
@@ -1259,7 +1266,11 @@ static void do_path_verification_work(struct work_struct *work)
schedule_work(work);
return;
}
-
+ /* check if path verification already running and delay if so */
+ if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
+ schedule_work(work);
+ return;
+ }
opm = 0;
npm = 0;
ppm = 0;
@@ -1402,7 +1413,7 @@ static void do_path_verification_work(struct work_struct *work)
device->path_data.hpfpm |= hpfpm;
spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
}
-
+ clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
dasd_put_device(device);
if (data->isglobal)
mutex_unlock(&dasd_path_verification_mutex);
@@ -1810,6 +1821,7 @@ out_err1:
static void dasd_eckd_uncheck_device(struct dasd_device *device)
{
struct dasd_eckd_private *private;
+ int i;
private = (struct dasd_eckd_private *) device->private;
dasd_alias_disconnect_device_from_lcu(device);
@@ -1818,6 +1830,15 @@ static void dasd_eckd_uncheck_device(struct dasd_device *device)
private->vdsneq = NULL;
private->gneq = NULL;
private->conf_len = 0;
+ for (i = 0; i < 8; i++) {
+ kfree(private->path_conf_data[i]);
+ if ((__u8 *)private->path_conf_data[i] ==
+ private->conf_data) {
+ private->conf_data = NULL;
+ private->conf_len = 0;
+ }
+ private->path_conf_data[i] = NULL;
+ }
kfree(private->conf_data);
private->conf_data = NULL;
}
@@ -3968,7 +3989,7 @@ static int dasd_symm_io(struct dasd_device *device, void __user *argp)
rc = -EFAULT;
if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
goto out;
- if (is_compat_task() || sizeof(long) == 4) {
+ if (is_compat_task()) {
/* Make sure pointers are sane even on 31 bit. */
rc = -EINVAL;
if ((usrparm.psf_data >> 32) != 0)
@@ -4525,12 +4546,13 @@ static int dasd_eckd_read_message_buffer(struct dasd_device *device,
cqr->startdev = device;
cqr->memdev = device;
cqr->block = NULL;
- cqr->retries = 256;
cqr->expires = 10 * HZ;
-
- /* we need to check for messages on exactly this path */
set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
- cqr->lpm = lpum;
+ /* dasd_sleep_on_immediatly does not do complex error
+ * recovery so clear erp flag and set retry counter to
+ * do basic erp */
+ clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
+ cqr->retries = 256;
/* Prepare for Read Subsystem Data */
prssdp = (struct dasd_psf_prssd_data *) cqr->data;
@@ -4605,10 +4627,10 @@ dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
psf_cuir->message_id = message_id;
psf_cuir->cssid = sch_id.cssid;
psf_cuir->ssid = sch_id.ssid;
-
ccw = cqr->cpaddr;
ccw->cmd_code = DASD_ECKD_CCW_PSF;
ccw->cda = (__u32)(addr_t)psf_cuir;
+ ccw->flags = CCW_FLAG_SLI;
ccw->count = sizeof(struct dasd_psf_cuir_response);
cqr->startdev = device;
@@ -4618,6 +4640,7 @@ dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
cqr->expires = 10*HZ;
cqr->buildclk = get_tod_clock();
cqr->status = DASD_CQR_FILLED;
+ set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
rc = dasd_sleep_on(cqr);
@@ -4625,118 +4648,252 @@ dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
return rc;
}
-static int dasd_eckd_cuir_change_state(struct dasd_device *device, __u8 lpum)
+/*
+ * return configuration data that is referenced by record selector
+ * if a record selector is specified or per default return the
+ * conf_data pointer for the path specified by lpum
+ */
+static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
+ __u8 lpum,
+ struct dasd_cuir_message *cuir)
{
- unsigned long flags;
- __u8 tbcpm;
+ struct dasd_eckd_private *private;
+ struct dasd_conf_data *conf_data;
+ int path, pos;
- spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
- tbcpm = device->path_data.opm & ~lpum;
- if (tbcpm) {
- device->path_data.opm = tbcpm;
- device->path_data.cuirpm |= lpum;
+ private = (struct dasd_eckd_private *) device->private;
+ if (cuir->record_selector == 0)
+ goto out;
+ for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
+ conf_data = private->path_conf_data[pos];
+ if (conf_data->gneq.record_selector ==
+ cuir->record_selector)
+ return conf_data;
+ }
+out:
+ return private->path_conf_data[8 - ffs(lpum)];
+}
+
+/*
+ * This function determines the scope of a reconfiguration request by
+ * analysing the path and device selection data provided in the CUIR request.
+ * Returns a path mask containing CUIR affected paths for the give device.
+ *
+ * If the CUIR request does not contain the required information return the
+ * path mask of the path the attention message for the CUIR request was reveived
+ * on.
+ */
+static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
+ struct dasd_cuir_message *cuir)
+{
+ struct dasd_conf_data *ref_conf_data;
+ unsigned long bitmask = 0, mask = 0;
+ struct dasd_eckd_private *private;
+ struct dasd_conf_data *conf_data;
+ unsigned int pos, path;
+ char *ref_gneq, *gneq;
+ char *ref_ned, *ned;
+ int tbcpm = 0;
+
+ /* if CUIR request does not specify the scope use the path
+ the attention message was presented on */
+ if (!cuir->ned_map ||
+ !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
+ return lpum;
+
+ private = (struct dasd_eckd_private *) device->private;
+ /* get reference conf data */
+ ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
+ /* reference ned is determined by ned_map field */
+ pos = 8 - ffs(cuir->ned_map);
+ ref_ned = (char *)&ref_conf_data->neds[pos];
+ ref_gneq = (char *)&ref_conf_data->gneq;
+ /* transfer 24 bit neq_map to mask */
+ mask = cuir->neq_map[2];
+ mask |= cuir->neq_map[1] << 8;
+ mask |= cuir->neq_map[0] << 16;
+
+ for (path = 0x80; path; path >>= 1) {
+ /* initialise data per path */
+ bitmask = mask;
+ pos = 8 - ffs(path);
+ conf_data = private->path_conf_data[pos];
+ pos = 8 - ffs(cuir->ned_map);
+ ned = (char *) &conf_data->neds[pos];
+ /* compare reference ned and per path ned */
+ if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
+ continue;
+ gneq = (char *)&conf_data->gneq;
+ /* compare reference gneq and per_path gneq under
+ 24 bit mask where mask bit 0 equals byte 7 of
+ the gneq and mask bit 24 equals byte 31 */
+ while (bitmask) {
+ pos = ffs(bitmask) - 1;
+ if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
+ != 0)
+ break;
+ clear_bit(pos, &bitmask);
+ }
+ if (bitmask)
+ continue;
+ /* device and path match the reference values
+ add path to CUIR scope */
+ tbcpm |= path;
+ }
+ return tbcpm;
+}
+
+static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
+ unsigned long paths,
+ struct subchannel_id sch_id, int action)
+{
+ struct channel_path_desc *desc;
+ int pos;
+
+ while (paths) {
+ /* get position of bit in mask */
+ pos = ffs(paths) - 1;
+ /* get channel path descriptor from this position */
+ desc = ccw_device_get_chp_desc(device->cdev, 7 - pos);
+ if (action == CUIR_QUIESCE)
+ pr_warn("Service on the storage server caused path "
+ "%x.%02x to go offline", sch_id.cssid,
+ desc ? desc->chpid : 0);
+ else if (action == CUIR_RESUME)
+ pr_info("Path %x.%02x is back online after service "
+ "on the storage server", sch_id.cssid,
+ desc ? desc->chpid : 0);
+ kfree(desc);
+ clear_bit(pos, &paths);
}
- spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
- return tbcpm ? 0 : PSF_CUIR_LAST_PATH;
+}
+
+static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
+ struct dasd_cuir_message *cuir)
+{
+ unsigned long tbcpm;
+
+ tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
+ /* nothing to do if path is not in use */
+ if (!(device->path_data.opm & tbcpm))
+ return 0;
+ if (!(device->path_data.opm & ~tbcpm)) {
+ /* no path would be left if the CUIR action is taken
+ return error */
+ return -EINVAL;
+ }
+ /* remove device from operational path mask */
+ device->path_data.opm &= ~tbcpm;
+ device->path_data.cuirpm |= tbcpm;
+ return tbcpm;
}
/*
- * walk through all devices and quiesce them
- * if it is the last path return error
+ * walk through all devices and build a path mask to quiesce them
+ * return an error if the last path to a device would be removed
*
* if only part of the devices are quiesced and an error
* occurs no onlining necessary, the storage server will
* notify the already set offline devices again
*/
static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
- struct channel_path_desc *desc,
- struct subchannel_id sch_id)
+ struct subchannel_id sch_id,
+ struct dasd_cuir_message *cuir)
{
struct alias_pav_group *pavgroup, *tempgroup;
struct dasd_eckd_private *private;
struct dasd_device *dev, *n;
- int rc;
+ unsigned long paths = 0;
+ unsigned long flags;
+ int tbcpm;
private = (struct dasd_eckd_private *) device->private;
- rc = 0;
-
/* active devices */
- list_for_each_entry_safe(dev, n,
- &private->lcu->active_devices,
+ list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
alias_list) {
- rc = dasd_eckd_cuir_change_state(dev, lpum);
- if (rc)
- goto out;
+ spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
+ tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
+ spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
+ if (tbcpm < 0)
+ goto out_err;
+ paths |= tbcpm;
}
-
/* inactive devices */
- list_for_each_entry_safe(dev, n,
- &private->lcu->inactive_devices,
+ list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
alias_list) {
- rc = dasd_eckd_cuir_change_state(dev, lpum);
- if (rc)
- goto out;
+ spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
+ tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
+ spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
+ if (tbcpm < 0)
+ goto out_err;
+ paths |= tbcpm;
}
-
/* devices in PAV groups */
list_for_each_entry_safe(pavgroup, tempgroup,
&private->lcu->grouplist, group) {
list_for_each_entry_safe(dev, n, &pavgroup->baselist,
alias_list) {
- rc = dasd_eckd_cuir_change_state(dev, lpum);
- if (rc)
- goto out;
+ spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
+ tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
+ spin_unlock_irqrestore(
+ get_ccwdev_lock(dev->cdev), flags);
+ if (tbcpm < 0)
+ goto out_err;
+ paths |= tbcpm;
}
list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
alias_list) {
- rc = dasd_eckd_cuir_change_state(dev, lpum);
- if (rc)
- goto out;
+ spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
+ tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
+ spin_unlock_irqrestore(
+ get_ccwdev_lock(dev->cdev), flags);
+ if (tbcpm < 0)
+ goto out_err;
+ paths |= tbcpm;
}
}
-
- pr_warn("Service on the storage server caused path %x.%02x to go offline",
- sch_id.cssid, desc ? desc->chpid : 0);
- rc = PSF_CUIR_COMPLETED;
-out:
- return rc;
+ /* notify user about all paths affected by CUIR action */
+ dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_QUIESCE);
+ return 0;
+out_err:
+ return tbcpm;
}
static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
- struct channel_path_desc *desc,
- struct subchannel_id sch_id)
+ struct subchannel_id sch_id,
+ struct dasd_cuir_message *cuir)
{
struct alias_pav_group *pavgroup, *tempgroup;
struct dasd_eckd_private *private;
struct dasd_device *dev, *n;
+ unsigned long paths = 0;
+ int tbcpm;
- pr_info("Path %x.%02x is back online after service on the storage server",
- sch_id.cssid, desc ? desc->chpid : 0);
private = (struct dasd_eckd_private *) device->private;
-
/*
* the path may have been added through a generic path event before
* only trigger path verification if the path is not already in use
*/
-
list_for_each_entry_safe(dev, n,
&private->lcu->active_devices,
alias_list) {
- if (!(dev->path_data.opm & lpum)) {
- dev->path_data.tbvpm |= lpum;
+ tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
+ paths |= tbcpm;
+ if (!(dev->path_data.opm & tbcpm)) {
+ dev->path_data.tbvpm |= tbcpm;
dasd_schedule_device_bh(dev);
}
}
-
list_for_each_entry_safe(dev, n,
&private->lcu->inactive_devices,
alias_list) {
- if (!(dev->path_data.opm & lpum)) {
- dev->path_data.tbvpm |= lpum;
+ tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
+ paths |= tbcpm;
+ if (!(dev->path_data.opm & tbcpm)) {
+ dev->path_data.tbvpm |= tbcpm;
dasd_schedule_device_bh(dev);
}
}
-
/* devices in PAV groups */
list_for_each_entry_safe(pavgroup, tempgroup,
&private->lcu->grouplist,
@@ -4744,21 +4901,27 @@ static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
list_for_each_entry_safe(dev, n,
&pavgroup->baselist,
alias_list) {
- if (!(dev->path_data.opm & lpum)) {
- dev->path_data.tbvpm |= lpum;
+ tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
+ paths |= tbcpm;
+ if (!(dev->path_data.opm & tbcpm)) {
+ dev->path_data.tbvpm |= tbcpm;
dasd_schedule_device_bh(dev);
}
}
list_for_each_entry_safe(dev, n,
&pavgroup->aliaslist,
alias_list) {
- if (!(dev->path_data.opm & lpum)) {
- dev->path_data.tbvpm |= lpum;
+ tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
+ paths |= tbcpm;
+ if (!(dev->path_data.opm & tbcpm)) {
+ dev->path_data.tbvpm |= tbcpm;
dasd_schedule_device_bh(dev);
}
}
}
- return PSF_CUIR_COMPLETED;
+ /* notify user about all paths affected by CUIR action */
+ dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_RESUME);
+ return 0;
}
static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
@@ -4768,8 +4931,12 @@ static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
struct channel_path_desc *desc;
struct subchannel_id sch_id;
int pos, response;
- ccw_device_get_schid(device->cdev, &sch_id);
+ DBF_DEV_EVENT(DBF_WARNING, device,
+ "CUIR request: %016llx %016llx %016llx %08x",
+ ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
+ ((u32 *)cuir)[3]);
+ ccw_device_get_schid(device->cdev, &sch_id);
/* get position of path in mask */
pos = 8 - ffs(lpum);
/* get channel path descriptor from this position */
@@ -4777,18 +4944,26 @@ static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
if (cuir->code == CUIR_QUIESCE) {
/* quiesce */
- response = dasd_eckd_cuir_quiesce(device, lpum, desc, sch_id);
+ if (dasd_eckd_cuir_quiesce(device, lpum, sch_id, cuir))
+ response = PSF_CUIR_LAST_PATH;
+ else
+ response = PSF_CUIR_COMPLETED;
} else if (cuir->code == CUIR_RESUME) {
/* resume */
- response = dasd_eckd_cuir_resume(device, lpum, desc, sch_id);
+ dasd_eckd_cuir_resume(device, lpum, sch_id, cuir);
+ response = PSF_CUIR_COMPLETED;
} else
response = PSF_CUIR_NOT_SUPPORTED;
- dasd_eckd_psf_cuir_response(device, response, cuir->message_id,
- desc, sch_id);
-
+ dasd_eckd_psf_cuir_response(device, response,
+ cuir->message_id, desc, sch_id);
+ DBF_DEV_EVENT(DBF_WARNING, device,
+ "CUIR response: %d on message ID %08x", response,
+ cuir->message_id);
/* free descriptor copy */
kfree(desc);
+ /* to make sure there is no attention left schedule work again */
+ device->discipline->check_attention(device, lpum);
}
static void dasd_eckd_check_attention_work(struct work_struct *work)
@@ -4800,22 +4975,18 @@ static void dasd_eckd_check_attention_work(struct work_struct *work)
data = container_of(work, struct check_attention_work_data, worker);
device = data->device;
-
messages = kzalloc(sizeof(*messages), GFP_KERNEL);
if (!messages) {
DBF_DEV_EVENT(DBF_WARNING, device, "%s",
"Could not allocate attention message buffer");
goto out;
}
-
rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
if (rc)
goto out;
-
if (messages->length == ATTENTION_LENGTH_CUIR &&
messages->format == ATTENTION_FORMAT_CUIR)
dasd_eckd_handle_cuir(device, messages, data->lpum);
-
out:
dasd_put_device(device);
kfree(messages);
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-16 18:07:17 +0000