Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754171AbcDAGyz (ORCPT ); Fri, 1 Apr 2016 02:54:55 -0400 Received: from e06smtp07.uk.ibm.com ([195.75.94.103]:40523 "EHLO e06smtp07.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751330AbcDAGyx (ORCPT ); Fri, 1 Apr 2016 02:54:53 -0400 X-IBM-Helo: d06dlp01.portsmouth.uk.ibm.com X-IBM-MailFrom: schwidefsky@de.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org;linux-s390@vger.kernel.org Date: Fri, 1 Apr 2016 08:54:46 +0200 From: Martin Schwidefsky To: Linus Torvalds Cc: linux-kernel , linux-s390 , Heiko Carstens Subject: Re: [GIT PULL] s390 patches for 4.6-rc2 Message-ID: <20160401085446.2aa8d1a1@mschwide> In-Reply-To: References: <20160331145724.13258ddb@mschwide> <20160331152651.650e334a@mschwide> X-Mailer: Claws Mail 3.9.3 (GTK+ 2.24.23; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16040106-0029-0000-0000-00000C7E246E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 23266 Lines: 692 On Thu, 31 Mar 2016 14:29:09 -0500 Linus Torvalds wrote: > On Thu, Mar 31, 2016 at 8:26 AM, Martin Schwidefsky > wrote: > > > > I really would like to see the "s390/dasd: reorder lcu and device lock" go > > into 4.6 as the current solution is really ugly. But I'll remove the patch > > with the new attribute. Would that be acceptable? > > That sounds better, yes. Ok, here we go: please pull from the 'for-linus' branch of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux.git for-linus to receive the following updates: * A proper fix for the locking issue in the dasd driver * Wire up the new preadv2 nad pwritev2 system calls * Add the mark_rodata_ro function and set DEBUG_RODATA=y * A few more bug fixes. Anna-Maria Gleixner (2): s390/cpum_cf: Fix missing cpu hotplug notifier transition s390/cpum_sf: Fix cpu hotplug notifier transitions Gerald Schaefer (1): s390/mm: handle PTE-mapped tail pages in fast gup Harald Freudenberger (1): s390/crypto: provide correct file mode at device register. Heiko Carstens (2): s390: add DEBUG_RODATA support s390: wire up preadv2/pwritev2 syscalls Kees Cook (1): s390: disable postinit-readonly for now Pierre Morel (1): s390/pci: PCI function group 0 is valid for clp_query_pci_fn Stefan Haberland (1): s390/dasd: reorder lcu and device lock arch/s390/Kconfig | 3 + arch/s390/crypto/prng.c | 2 + arch/s390/include/asm/cache.h | 3 + arch/s390/include/uapi/asm/unistd.h | 4 +- arch/s390/kernel/perf_cpum_cf.c | 1 + arch/s390/kernel/perf_cpum_sf.c | 2 +- arch/s390/kernel/syscalls.S | 2 + arch/s390/mm/gup.c | 8 +- arch/s390/mm/init.c | 10 +- arch/s390/pci/pci_clp.c | 3 +- drivers/s390/block/dasd_alias.c | 226 +++++++++--------------------------- drivers/s390/block/dasd_eckd.c | 38 ++++-- drivers/s390/block/dasd_eckd.h | 3 +- drivers/s390/block/dasd_int.h | 2 + 14 files changed, 114 insertions(+), 193 deletions(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 7e3e8a8..f8dea16 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -59,6 +59,9 @@ config PCI_QUIRKS config ARCH_SUPPORTS_UPROBES def_bool y +config DEBUG_RODATA + def_bool y + config S390 def_bool y select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE diff --git a/arch/s390/crypto/prng.c b/arch/s390/crypto/prng.c index b8045b9..d750cc0 100644 --- a/arch/s390/crypto/prng.c +++ b/arch/s390/crypto/prng.c @@ -669,11 +669,13 @@ static const struct file_operations prng_tdes_fops = { static struct miscdevice prng_sha512_dev = { .name = "prandom", .minor = MISC_DYNAMIC_MINOR, + .mode = 0644, .fops = &prng_sha512_fops, }; static struct miscdevice prng_tdes_dev = { .name = "prandom", .minor = MISC_DYNAMIC_MINOR, + .mode = 0644, .fops = &prng_tdes_fops, }; diff --git a/arch/s390/include/asm/cache.h b/arch/s390/include/asm/cache.h index 4d7ccac..22da3b3 100644 --- a/arch/s390/include/asm/cache.h +++ b/arch/s390/include/asm/cache.h @@ -15,4 +15,7 @@ #define __read_mostly __attribute__((__section__(".data..read_mostly"))) +/* Read-only memory is marked before mark_rodata_ro() is called. */ +#define __ro_after_init __read_mostly + #endif diff --git a/arch/s390/include/uapi/asm/unistd.h b/arch/s390/include/uapi/asm/unistd.h index ab3aa68..4384bc7 100644 --- a/arch/s390/include/uapi/asm/unistd.h +++ b/arch/s390/include/uapi/asm/unistd.h @@ -311,7 +311,9 @@ #define __NR_shutdown 373 #define __NR_mlock2 374 #define __NR_copy_file_range 375 -#define NR_syscalls 376 +#define __NR_preadv2 376 +#define __NR_pwritev2 377 +#define NR_syscalls 378 /* * There are some system calls that are not present on 64 bit, some diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c index 58bf457..62f066b 100644 --- a/arch/s390/kernel/perf_cpum_cf.c +++ b/arch/s390/kernel/perf_cpum_cf.c @@ -670,6 +670,7 @@ static int cpumf_pmu_notifier(struct notifier_block *self, unsigned long action, switch (action & ~CPU_TASKS_FROZEN) { case CPU_ONLINE: + case CPU_DOWN_FAILED: flags = PMC_INIT; smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1); break; diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index 1a43474..eaab9a7 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -1521,7 +1521,7 @@ static int cpumf_pmu_notifier(struct notifier_block *self, switch (action & ~CPU_TASKS_FROZEN) { case CPU_ONLINE: - case CPU_ONLINE_FROZEN: + case CPU_DOWN_FAILED: flags = PMC_INIT; smp_call_function_single(cpu, setup_pmc_cpu, &flags, 1); break; diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S index 293d8b9..9b59e62 100644 --- a/arch/s390/kernel/syscalls.S +++ b/arch/s390/kernel/syscalls.S @@ -384,3 +384,5 @@ SYSCALL(sys_recvmsg,compat_sys_recvmsg) SYSCALL(sys_shutdown,sys_shutdown) SYSCALL(sys_mlock2,compat_sys_mlock2) SYSCALL(sys_copy_file_range,compat_sys_copy_file_range) /* 375 */ +SYSCALL(sys_preadv2,compat_sys_preadv2) +SYSCALL(sys_pwritev2,compat_sys_pwritev2) diff --git a/arch/s390/mm/gup.c b/arch/s390/mm/gup.c index 13dab0c..3776aca 100644 --- a/arch/s390/mm/gup.c +++ b/arch/s390/mm/gup.c @@ -20,9 +20,9 @@ static inline int gup_pte_range(pmd_t *pmdp, pmd_t pmd, unsigned long addr, unsigned long end, int write, struct page **pages, int *nr) { + struct page *head, *page; unsigned long mask; pte_t *ptep, pte; - struct page *page; mask = (write ? _PAGE_PROTECT : 0) | _PAGE_INVALID | _PAGE_SPECIAL; @@ -37,12 +37,14 @@ static inline int gup_pte_range(pmd_t *pmdp, pmd_t pmd, unsigned long addr, return 0; VM_BUG_ON(!pfn_valid(pte_pfn(pte))); page = pte_page(pte); - if (!page_cache_get_speculative(page)) + head = compound_head(page); + if (!page_cache_get_speculative(head)) return 0; if (unlikely(pte_val(pte) != pte_val(*ptep))) { - put_page(page); + put_page(head); return 0; } + VM_BUG_ON_PAGE(compound_head(page) != head, page); pages[*nr] = page; (*nr)++; diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 73e2903..c7b0451 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -108,6 +108,13 @@ void __init paging_init(void) free_area_init_nodes(max_zone_pfns); } +void mark_rodata_ro(void) +{ + /* Text and rodata are already protected. Nothing to do here. */ + pr_info("Write protecting the kernel read-only data: %luk\n", + ((unsigned long)&_eshared - (unsigned long)&_stext) >> 10); +} + void __init mem_init(void) { if (MACHINE_HAS_TLB_LC) @@ -126,9 +133,6 @@ void __init mem_init(void) setup_zero_pages(); /* Setup zeroed pages. */ mem_init_print_info(NULL); - printk("Write protected kernel read-only data: %#lx - %#lx\n", - (unsigned long)&_stext, - PFN_ALIGN((unsigned long)&_eshared) - 1); } void free_initmem(void) diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c index 21591dd..1a4512c 100644 --- a/arch/s390/pci/pci_clp.c +++ b/arch/s390/pci/pci_clp.c @@ -176,8 +176,7 @@ static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh) rc = clp_store_query_pci_fn(zdev, &rrb->response); if (rc) goto out; - if (rrb->response.pfgid) - rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid); + rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid); } else { zpci_err("Q PCI FN:\n"); zpci_err_clp(rrb->response.hdr.rsp, rc); diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c index 17ad574..1e56018 100644 --- a/drivers/s390/block/dasd_alias.c +++ b/drivers/s390/block/dasd_alias.c @@ -317,17 +317,17 @@ static int _add_device_to_lcu(struct alias_lcu *lcu, struct alias_pav_group *group; struct dasd_uid uid; + spin_lock(get_ccwdev_lock(device->cdev)); private->uid.type = lcu->uac->unit[private->uid.real_unit_addr].ua_type; private->uid.base_unit_addr = lcu->uac->unit[private->uid.real_unit_addr].base_ua; uid = private->uid; - + spin_unlock(get_ccwdev_lock(device->cdev)); /* if we have no PAV anyway, we don't need to bother with PAV groups */ if (lcu->pav == NO_PAV) { list_move(&device->alias_list, &lcu->active_devices); return 0; } - group = _find_group(lcu, &uid); if (!group) { group = kzalloc(sizeof(*group), GFP_ATOMIC); @@ -397,130 +397,6 @@ suborder_not_supported(struct dasd_ccw_req *cqr) return 0; } -/* - * This function tries to lock all devices on an lcu via trylock - * return NULL on success otherwise return first failed device - */ -static struct dasd_device *_trylock_all_devices_on_lcu(struct alias_lcu *lcu, - struct dasd_device *pos) - -{ - struct alias_pav_group *pavgroup; - struct dasd_device *device; - - list_for_each_entry(device, &lcu->active_devices, alias_list) { - if (device == pos) - continue; - if (!spin_trylock(get_ccwdev_lock(device->cdev))) - return device; - } - list_for_each_entry(device, &lcu->inactive_devices, alias_list) { - if (device == pos) - continue; - if (!spin_trylock(get_ccwdev_lock(device->cdev))) - return device; - } - list_for_each_entry(pavgroup, &lcu->grouplist, group) { - list_for_each_entry(device, &pavgroup->baselist, alias_list) { - if (device == pos) - continue; - if (!spin_trylock(get_ccwdev_lock(device->cdev))) - return device; - } - list_for_each_entry(device, &pavgroup->aliaslist, alias_list) { - if (device == pos) - continue; - if (!spin_trylock(get_ccwdev_lock(device->cdev))) - return device; - } - } - return NULL; -} - -/* - * unlock all devices except the one that is specified as pos - * stop if enddev is specified and reached - */ -static void _unlock_all_devices_on_lcu(struct alias_lcu *lcu, - struct dasd_device *pos, - struct dasd_device *enddev) - -{ - struct alias_pav_group *pavgroup; - struct dasd_device *device; - - list_for_each_entry(device, &lcu->active_devices, alias_list) { - if (device == pos) - continue; - if (device == enddev) - return; - spin_unlock(get_ccwdev_lock(device->cdev)); - } - list_for_each_entry(device, &lcu->inactive_devices, alias_list) { - if (device == pos) - continue; - if (device == enddev) - return; - spin_unlock(get_ccwdev_lock(device->cdev)); - } - list_for_each_entry(pavgroup, &lcu->grouplist, group) { - list_for_each_entry(device, &pavgroup->baselist, alias_list) { - if (device == pos) - continue; - if (device == enddev) - return; - spin_unlock(get_ccwdev_lock(device->cdev)); - } - list_for_each_entry(device, &pavgroup->aliaslist, alias_list) { - if (device == pos) - continue; - if (device == enddev) - return; - spin_unlock(get_ccwdev_lock(device->cdev)); - } - } -} - -/* - * this function is needed because the locking order - * device lock -> lcu lock - * needs to be assured when iterating over devices in an LCU - * - * if a device is specified in pos then the device lock is already hold - */ -static void _trylock_and_lock_lcu_irqsave(struct alias_lcu *lcu, - struct dasd_device *pos, - unsigned long *flags) -{ - struct dasd_device *failed; - - do { - spin_lock_irqsave(&lcu->lock, *flags); - failed = _trylock_all_devices_on_lcu(lcu, pos); - if (failed) { - _unlock_all_devices_on_lcu(lcu, pos, failed); - spin_unlock_irqrestore(&lcu->lock, *flags); - cpu_relax(); - } - } while (failed); -} - -static void _trylock_and_lock_lcu(struct alias_lcu *lcu, - struct dasd_device *pos) -{ - struct dasd_device *failed; - - do { - spin_lock(&lcu->lock); - failed = _trylock_all_devices_on_lcu(lcu, pos); - if (failed) { - _unlock_all_devices_on_lcu(lcu, pos, failed); - spin_unlock(&lcu->lock); - cpu_relax(); - } - } while (failed); -} - static int read_unit_address_configuration(struct dasd_device *device, struct alias_lcu *lcu) { @@ -615,7 +491,7 @@ static int _lcu_update(struct dasd_device *refdev, struct alias_lcu *lcu) if (rc) return rc; - _trylock_and_lock_lcu_irqsave(lcu, NULL, &flags); + spin_lock_irqsave(&lcu->lock, flags); lcu->pav = NO_PAV; for (i = 0; i < MAX_DEVICES_PER_LCU; ++i) { switch (lcu->uac->unit[i].ua_type) { @@ -634,7 +510,6 @@ static int _lcu_update(struct dasd_device *refdev, struct alias_lcu *lcu) alias_list) { _add_device_to_lcu(lcu, device, refdev); } - _unlock_all_devices_on_lcu(lcu, NULL, NULL); spin_unlock_irqrestore(&lcu->lock, flags); return 0; } @@ -722,8 +597,7 @@ int dasd_alias_add_device(struct dasd_device *device) lcu = private->lcu; rc = 0; - spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); - spin_lock(&lcu->lock); + spin_lock_irqsave(&lcu->lock, flags); if (!(lcu->flags & UPDATE_PENDING)) { rc = _add_device_to_lcu(lcu, device, device); if (rc) @@ -733,8 +607,7 @@ int dasd_alias_add_device(struct dasd_device *device) list_move(&device->alias_list, &lcu->active_devices); _schedule_lcu_update(lcu, device); } - spin_unlock(&lcu->lock); - spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); + spin_unlock_irqrestore(&lcu->lock, flags); return rc; } @@ -933,15 +806,27 @@ static void _stop_all_devices_on_lcu(struct alias_lcu *lcu) struct alias_pav_group *pavgroup; struct dasd_device *device; - list_for_each_entry(device, &lcu->active_devices, alias_list) + list_for_each_entry(device, &lcu->active_devices, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); dasd_device_set_stop_bits(device, DASD_STOPPED_SU); - list_for_each_entry(device, &lcu->inactive_devices, alias_list) + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(device, &lcu->inactive_devices, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); dasd_device_set_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } list_for_each_entry(pavgroup, &lcu->grouplist, group) { - list_for_each_entry(device, &pavgroup->baselist, alias_list) + list_for_each_entry(device, &pavgroup->baselist, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); dasd_device_set_stop_bits(device, DASD_STOPPED_SU); - list_for_each_entry(device, &pavgroup->aliaslist, alias_list) + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(device, &pavgroup->aliaslist, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); dasd_device_set_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } } } @@ -950,15 +835,27 @@ static void _unstop_all_devices_on_lcu(struct alias_lcu *lcu) struct alias_pav_group *pavgroup; struct dasd_device *device; - list_for_each_entry(device, &lcu->active_devices, alias_list) + list_for_each_entry(device, &lcu->active_devices, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); dasd_device_remove_stop_bits(device, DASD_STOPPED_SU); - list_for_each_entry(device, &lcu->inactive_devices, alias_list) + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(device, &lcu->inactive_devices, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); dasd_device_remove_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } list_for_each_entry(pavgroup, &lcu->grouplist, group) { - list_for_each_entry(device, &pavgroup->baselist, alias_list) + list_for_each_entry(device, &pavgroup->baselist, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); dasd_device_remove_stop_bits(device, DASD_STOPPED_SU); - list_for_each_entry(device, &pavgroup->aliaslist, alias_list) + spin_unlock(get_ccwdev_lock(device->cdev)); + } + list_for_each_entry(device, &pavgroup->aliaslist, alias_list) { + spin_lock(get_ccwdev_lock(device->cdev)); dasd_device_remove_stop_bits(device, DASD_STOPPED_SU); + spin_unlock(get_ccwdev_lock(device->cdev)); + } } } @@ -984,48 +881,32 @@ static void summary_unit_check_handling_work(struct work_struct *work) spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); reset_summary_unit_check(lcu, device, suc_data->reason); - _trylock_and_lock_lcu_irqsave(lcu, NULL, &flags); + spin_lock_irqsave(&lcu->lock, flags); _unstop_all_devices_on_lcu(lcu); _restart_all_base_devices_on_lcu(lcu); /* 3. read new alias configuration */ _schedule_lcu_update(lcu, device); lcu->suc_data.device = NULL; dasd_put_device(device); - _unlock_all_devices_on_lcu(lcu, NULL, NULL); spin_unlock_irqrestore(&lcu->lock, flags); } -/* - * note: this will be called from int handler context (cdev locked) - */ -void dasd_alias_handle_summary_unit_check(struct dasd_device *device, - struct irb *irb) +void dasd_alias_handle_summary_unit_check(struct work_struct *work) { + struct dasd_device *device = container_of(work, struct dasd_device, + suc_work); struct dasd_eckd_private *private = device->private; struct alias_lcu *lcu; - char reason; - char *sense; - - sense = dasd_get_sense(irb); - if (sense) { - reason = sense[8]; - DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x", - "eckd handle summary unit check: reason", reason); - } else { - DBF_DEV_EVENT(DBF_WARNING, device, "%s", - "eckd handle summary unit check:" - " no reason code available"); - return; - } + unsigned long flags; lcu = private->lcu; if (!lcu) { DBF_DEV_EVENT(DBF_WARNING, device, "%s", "device not ready to handle summary" " unit check (no lcu structure)"); - return; + goto out; } - _trylock_and_lock_lcu(lcu, device); + spin_lock_irqsave(&lcu->lock, flags); /* If this device is about to be removed just return and wait for * the next interrupt on a different device */ @@ -1033,27 +914,26 @@ void dasd_alias_handle_summary_unit_check(struct dasd_device *device, DBF_DEV_EVENT(DBF_WARNING, device, "%s", "device is in offline processing," " don't do summary unit check handling"); - _unlock_all_devices_on_lcu(lcu, device, NULL); - spin_unlock(&lcu->lock); - return; + goto out_unlock; } if (lcu->suc_data.device) { /* already scheduled or running */ DBF_DEV_EVENT(DBF_WARNING, device, "%s", "previous instance of summary unit check worker" " still pending"); - _unlock_all_devices_on_lcu(lcu, device, NULL); - spin_unlock(&lcu->lock); - return ; + goto out_unlock; } _stop_all_devices_on_lcu(lcu); /* prepare for lcu_update */ - private->lcu->flags |= NEED_UAC_UPDATE | UPDATE_PENDING; - lcu->suc_data.reason = reason; + lcu->flags |= NEED_UAC_UPDATE | UPDATE_PENDING; + lcu->suc_data.reason = private->suc_reason; lcu->suc_data.device = device; dasd_get_device(device); - _unlock_all_devices_on_lcu(lcu, device, NULL); - spin_unlock(&lcu->lock); if (!schedule_work(&lcu->suc_data.worker)) dasd_put_device(device); +out_unlock: + spin_unlock_irqrestore(&lcu->lock, flags); +out: + clear_bit(DASD_FLAG_SUC, &device->flags); + dasd_put_device(device); }; diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 75c032d..c1b4ae5 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -1682,6 +1682,8 @@ dasd_eckd_check_characteristics(struct dasd_device *device) /* setup work queue for validate server*/ INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server); + /* setup work queue for summary unit check */ + INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check); if (!ccw_device_is_pathgroup(device->cdev)) { dev_warn(&device->cdev->dev, @@ -2549,14 +2551,6 @@ static void dasd_eckd_check_for_device_change(struct dasd_device *device, device->state == DASD_STATE_ONLINE && !test_bit(DASD_FLAG_OFFLINE, &device->flags) && !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) { - /* - * the state change could be caused by an alias - * reassignment remove device from alias handling - * to prevent new requests from being scheduled on - * the wrong alias device - */ - dasd_alias_remove_device(device); - /* schedule worker to reload device */ dasd_reload_device(device); } @@ -2571,7 +2565,27 @@ static void dasd_eckd_check_for_device_change(struct dasd_device *device, /* summary unit check */ if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) && (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) { - dasd_alias_handle_summary_unit_check(device, irb); + if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "eckd suc: device already notified"); + return; + } + sense = dasd_get_sense(irb); + if (!sense) { + DBF_DEV_EVENT(DBF_WARNING, device, "%s", + "eckd suc: no reason code available"); + clear_bit(DASD_FLAG_SUC, &device->flags); + return; + + } + private->suc_reason = sense[8]; + DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x", + "eckd handle summary unit check: reason", + private->suc_reason); + dasd_get_device(device); + if (!schedule_work(&device->suc_work)) + dasd_put_device(device); + return; } @@ -4495,6 +4509,12 @@ static int dasd_eckd_reload_device(struct dasd_device *device) struct dasd_uid uid; unsigned long flags; + /* + * remove device from alias handling to prevent new requests + * from being scheduled on the wrong alias device + */ + dasd_alias_remove_device(device); + spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); old_base = private->uid.base_unit_addr; spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); diff --git a/drivers/s390/block/dasd_eckd.h b/drivers/s390/block/dasd_eckd.h index f8f91ee..6d9a6d3 100644 --- a/drivers/s390/block/dasd_eckd.h +++ b/drivers/s390/block/dasd_eckd.h @@ -525,6 +525,7 @@ struct dasd_eckd_private { int count; u32 fcx_max_data; + char suc_reason; }; @@ -534,7 +535,7 @@ void dasd_alias_disconnect_device_from_lcu(struct dasd_device *); int dasd_alias_add_device(struct dasd_device *); int dasd_alias_remove_device(struct dasd_device *); struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *); -void dasd_alias_handle_summary_unit_check(struct dasd_device *, struct irb *); +void dasd_alias_handle_summary_unit_check(struct work_struct *); void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *); void dasd_alias_lcu_setup_complete(struct dasd_device *); void dasd_alias_wait_for_lcu_setup(struct dasd_device *); diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h index 8de29be..0f0add9 100644 --- a/drivers/s390/block/dasd_int.h +++ b/drivers/s390/block/dasd_int.h @@ -470,6 +470,7 @@ struct dasd_device { struct work_struct restore_device; struct work_struct reload_device; struct work_struct kick_validate; + struct work_struct suc_work; struct timer_list timer; debug_info_t *debug_area; @@ -542,6 +543,7 @@ struct dasd_attention_data { #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ +#define DASD_FLAG_SUC 14 /* unhandled summary unit check */ #define DASD_SLEEPON_START_TAG ((void *) 1) #define DASD_SLEEPON_END_TAG ((void *) 2)