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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 

Pull s390 fixes from Martin Schwidefsky:
 - 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.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390: wire up preadv2/pwritev2 syscalls
  s390/pci: PCI function group 0 is valid for clp_query_pci_fn
  s390/crypto: provide correct file mode at device register.
  s390/mm: handle PTE-mapped tail pages in fast gup
  s390: add DEBUG_RODATA support
  s390: disable postinit-readonly for now
  s390/dasd: reorder lcu and device lock
  s390/cpum_sf: Fix cpu hotplug notifier transitions
  s390/cpum_cf: Fix missing cpu hotplug notifier transition
This commit is contained in:
Linus Torvalds 2016-04-01 07:15:54 -05:00
parent c05c2ec96b 3358999a8e
commit dc8a64ee1a
14 changed files with 114 additions and 193 deletions
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3
arch/s390/Kconfig
View File

@ -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

2
arch/s390/crypto/prng.c
View File

@ -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,
};

3
arch/s390/include/asm/cache.h
View File

@ -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

4
arch/s390/include/uapi/asm/unistd.h
View File

@ -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

1
arch/s390/kernel/perf_cpum_cf.c
View File

@ -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;

2
arch/s390/kernel/perf_cpum_sf.c
View File

@ -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;

2
arch/s390/kernel/syscalls.S
View File

@ -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)

8
arch/s390/mm/gup.c
View File

@ -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)++;

10
arch/s390/mm/init.c
View File

@ -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)

3
arch/s390/pci/pci_clp.c
View File

@ -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);

226
drivers/s390/block/dasd_alias.c
View File

@ -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);
};

38
drivers/s390/block/dasd_eckd.c
View File

@ -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);

3
drivers/s390/block/dasd_eckd.h
View File

@ -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 *);

2
drivers/s390/block/dasd_int.h
View File

@ -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)