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s390/dasd: add autoquiesce feature
Add the internal logic to check for autoquiesce triggers and handle them. Quiesce and resume are functions that tell Linux to stop/resume issuing I/Os to a specific DASD. The DASD driver allows a manual quiesce/resume via ioctl. Autoquiesce will define an amount of triggers that will lead to an automatic quiesce if a certain event occurs. There is no automatic resume. All events will be reported via DASD Extended Error Reporting (EER) if configured. Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com> Reviewed-by: Halil Pasic <pasic@linux.ibm.com> Link: https://lore.kernel.org/r/20230405142017.2446986-3-sth@linux.ibm.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -78,6 +78,7 @@ typedef struct dasd_information2_t {
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* 0x040: give access to raw eckd data
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* 0x080: enable discard support
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* 0x100: enable autodisable for IFCC errors (default)
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* 0x200: enable requeue of all requests on autoquiesce
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*/
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#define DASD_FEATURE_READONLY 0x001
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#define DASD_FEATURE_USEDIAG 0x002
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@ -88,6 +89,7 @@ typedef struct dasd_information2_t {
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#define DASD_FEATURE_USERAW 0x040
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#define DASD_FEATURE_DISCARD 0x080
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#define DASD_FEATURE_PATH_AUTODISABLE 0x100
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#define DASD_FEATURE_REQUEUEQUIESCE 0x200
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#define DASD_FEATURE_DEFAULT DASD_FEATURE_PATH_AUTODISABLE
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#define DASD_PARTN_BITS 2
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@ -73,7 +73,8 @@ static void dasd_profile_init(struct dasd_profile *, struct dentry *);
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static void dasd_profile_exit(struct dasd_profile *);
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static void dasd_hosts_init(struct dentry *, struct dasd_device *);
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static void dasd_hosts_exit(struct dasd_device *);
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static int dasd_handle_autoquiesce(struct dasd_device *, struct dasd_ccw_req *,
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unsigned int);
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/*
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* SECTION: Operations on the device structure.
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*/
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@ -2325,7 +2326,7 @@ static int _dasd_sleep_on(struct dasd_ccw_req *maincqr, int interruptible)
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/* Non-temporary stop condition will trigger fail fast */
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if (device->stopped & ~DASD_STOPPED_PENDING &&
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test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
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(!dasd_eer_enabled(device))) {
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!dasd_eer_enabled(device) && device->aq_mask == 0) {
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cqr->status = DASD_CQR_FAILED;
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cqr->intrc = -ENOLINK;
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continue;
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@ -2801,20 +2802,18 @@ static void __dasd_process_block_ccw_queue(struct dasd_block *block,
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dasd_log_sense(cqr, &cqr->irb);
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}
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/* First of all call extended error reporting. */
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if (dasd_eer_enabled(base) &&
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cqr->status == DASD_CQR_FAILED) {
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dasd_eer_write(base, cqr, DASD_EER_FATALERROR);
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/* restart request */
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/*
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* First call extended error reporting and check for autoquiesce
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*/
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spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
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if (cqr->status == DASD_CQR_FAILED &&
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dasd_handle_autoquiesce(base, cqr, DASD_EER_FATALERROR)) {
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cqr->status = DASD_CQR_FILLED;
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cqr->retries = 255;
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spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
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dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
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spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
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flags);
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spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
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goto restart;
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}
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spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
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/* Process finished ERP request. */
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if (cqr->refers) {
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@ -2856,7 +2855,7 @@ static void __dasd_block_start_head(struct dasd_block *block)
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/* Non-temporary stop condition will trigger fail fast */
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if (block->base->stopped & ~DASD_STOPPED_PENDING &&
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test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
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(!dasd_eer_enabled(block->base))) {
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!dasd_eer_enabled(block->base) && block->base->aq_mask == 0) {
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cqr->status = DASD_CQR_FAILED;
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cqr->intrc = -ENOLINK;
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dasd_schedule_block_bh(block);
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@ -3670,8 +3669,8 @@ int dasd_generic_last_path_gone(struct dasd_device *device)
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dev_warn(&device->cdev->dev, "No operational channel path is left "
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"for the device\n");
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DBF_DEV_EVENT(DBF_WARNING, device, "%s", "last path gone");
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/* First of all call extended error reporting. */
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dasd_eer_write(device, NULL, DASD_EER_NOPATH);
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/* First call extended error reporting and check for autoquiesce. */
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dasd_handle_autoquiesce(device, NULL, DASD_EER_NOPATH);
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if (device->state < DASD_STATE_BASIC)
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return 0;
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@ -3803,7 +3802,8 @@ void dasd_generic_path_event(struct ccw_device *cdev, int *path_event)
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"No verified channel paths remain for the device\n");
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DBF_DEV_EVENT(DBF_WARNING, device,
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"%s", "last verified path gone");
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dasd_eer_write(device, NULL, DASD_EER_NOPATH);
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/* First call extended error reporting and check for autoquiesce. */
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dasd_handle_autoquiesce(device, NULL, DASD_EER_NOPATH);
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dasd_device_set_stop_bits(device,
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DASD_STOPPED_DC_WAIT);
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}
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@ -3825,7 +3825,8 @@ EXPORT_SYMBOL_GPL(dasd_generic_verify_path);
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void dasd_generic_space_exhaust(struct dasd_device *device,
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struct dasd_ccw_req *cqr)
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{
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dasd_eer_write(device, NULL, DASD_EER_NOSPC);
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/* First call extended error reporting and check for autoquiesce. */
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dasd_handle_autoquiesce(device, NULL, DASD_EER_NOSPC);
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if (device->state < DASD_STATE_BASIC)
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return;
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@ -3958,6 +3959,31 @@ void dasd_schedule_requeue(struct dasd_device *device)
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}
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EXPORT_SYMBOL(dasd_schedule_requeue);
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static int dasd_handle_autoquiesce(struct dasd_device *device,
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struct dasd_ccw_req *cqr,
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unsigned int reason)
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{
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/* in any case write eer message with reason */
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if (dasd_eer_enabled(device))
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dasd_eer_write(device, cqr, reason);
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if (!test_bit(reason, &device->aq_mask))
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return 0;
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/* notify eer about autoquiesce */
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if (dasd_eer_enabled(device))
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dasd_eer_write(device, NULL, DASD_EER_AUTOQUIESCE);
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pr_info("%s: The DASD has been put in the quiesce state\n",
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dev_name(&device->cdev->dev));
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dasd_device_set_stop_bits(device, DASD_STOPPED_QUIESCE);
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if (device->features & DASD_FEATURE_REQUEUEQUIESCE)
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dasd_schedule_requeue(device);
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return 1;
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}
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static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
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int rdc_buffer_size,
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int magic)
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@ -387,6 +387,7 @@ void dasd_eer_write(struct dasd_device *device, struct dasd_ccw_req *cqr,
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break;
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case DASD_EER_NOPATH:
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case DASD_EER_NOSPC:
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case DASD_EER_AUTOQUIESCE:
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dasd_eer_write_standard_trigger(device, NULL, id);
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break;
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case DASD_EER_STATECHANGE:
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@ -450,6 +450,7 @@ extern struct dasd_discipline *dasd_diag_discipline_pointer;
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#define DASD_EER_STATECHANGE 3
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#define DASD_EER_PPRCSUSPEND 4
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#define DASD_EER_NOSPC 5
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#define DASD_EER_AUTOQUIESCE 31
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/* DASD path handling */
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@ -627,6 +628,7 @@ struct dasd_device {
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struct dasd_format_entry format_entry;
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struct kset *paths_info;
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struct dasd_copy_relation *copy;
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unsigned long aq_mask;
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};
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struct dasd_block {
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