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

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Pull s390 fixes from Martin Schwidefsky:
 "Nine bug fixes for s390:

   - Three fixes for the expoline code, one of them is strictly speaking
     a cleanup but as it relates to code added with 4.16 I would like to
     include the patch.

   - Three timer related fixes in the common I/O layer

   - A fix for the handling of internal DASD request which could cause
     panics.

   - One correction in regard to the accounting of pud page tables vs.
     compat tasks.

   - The register scrubbing in entry.S caused spurious crashes, this is
     fixed now as well"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/entry.S: fix spurious zeroing of r0
  s390: Fix runtime warning about negative pgtables_bytes
  s390: do not bypass BPENTER for interrupt system calls
  s390/cio: clear timer when terminating driver I/O
  s390/cio: fix return code after missing interrupt
  s390/cio: fix ccw_device_start_timeout API
  s390/clean-up: use CFI_* macros in entry.S
  s390: Replace IS_ENABLED(EXPOLINE_*) with IS_ENABLED(CONFIG_EXPOLINE_*)
  s390/dasd: fix handling of internal requests
This commit is contained in:
Linus Torvalds 2018-03-07 10:59:23 -08:00
commit 69f39c5705
7 changed files with 54 additions and 62 deletions
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1
arch/s390/include/asm/mmu_context.h
View File

@ -63,6 +63,7 @@ static inline int init_new_context(struct task_struct *tsk,
_ASCE_USER_BITS | _ASCE_TYPE_SEGMENT;
/* pgd_alloc() did not account this pmd */
mm_inc_nr_pmds(mm);
mm_inc_nr_puds(mm);
}
crst_table_init((unsigned long *) mm->pgd, pgd_entry_type(mm));
return 0;

10
arch/s390/kernel/entry.S
View File

@ -14,6 +14,7 @@
#include <asm/processor.h>
#include <asm/cache.h>
#include <asm/ctl_reg.h>
#include <asm/dwarf.h>
#include <asm/errno.h>
#include <asm/ptrace.h>
#include <asm/thread_info.h>
@ -230,7 +231,7 @@ _PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
.hidden \name
.type \name,@function
\name:
.cfi_startproc
CFI_STARTPROC
#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
exrl 0,0f
#else
@ -239,7 +240,7 @@ _PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
#endif
j .
0: br \reg
.cfi_endproc
CFI_ENDPROC
.endm
GEN_BR_THUNK __s390x_indirect_jump_r1use_r9,%r9,%r1
@ -426,13 +427,13 @@ ENTRY(system_call)
UPDATE_VTIME %r8,%r9,__LC_SYNC_ENTER_TIMER
BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
stmg %r0,%r7,__PT_R0(%r11)
# clear user controlled register to prevent speculative use
xgr %r0,%r0
mvc __PT_R8(64,%r11),__LC_SAVE_AREA_SYNC
mvc __PT_PSW(16,%r11),__LC_SVC_OLD_PSW
mvc __PT_INT_CODE(4,%r11),__LC_SVC_ILC
stg %r14,__PT_FLAGS(%r11)
.Lsysc_do_svc:
# clear user controlled register to prevent speculative use
xgr %r0,%r0
# load address of system call table
lg %r10,__THREAD_sysc_table(%r13,%r12)
llgh %r8,__PT_INT_CODE+2(%r11)
@ -1439,6 +1440,7 @@ cleanup_critical:
stg %r15,__LC_SYSTEM_TIMER
0: # update accounting time stamp
mvc __LC_LAST_UPDATE_TIMER(8),__LC_SYNC_ENTER_TIMER
BPENTER __TI_flags(%r12),_TIF_ISOLATE_BP
# set up saved register r11
lg %r15,__LC_KERNEL_STACK
la %r9,STACK_FRAME_OVERHEAD(%r15)

4
arch/s390/kernel/nospec-branch.c
View File

@ -2,8 +2,8 @@
#include <linux/module.h>
#include <asm/nospec-branch.h>
int nospec_call_disable = IS_ENABLED(EXPOLINE_OFF);
int nospec_return_disable = !IS_ENABLED(EXPOLINE_FULL);
int nospec_call_disable = IS_ENABLED(CONFIG_EXPOLINE_OFF);
int nospec_return_disable = !IS_ENABLED(CONFIG_EXPOLINE_FULL);
static int __init nospectre_v2_setup_early(char *str)
{

21
drivers/s390/block/dasd.c
View File

@ -2581,8 +2581,6 @@ int dasd_cancel_req(struct dasd_ccw_req *cqr)
case DASD_CQR_QUEUED:
/* request was not started - just set to cleared */
cqr->status = DASD_CQR_CLEARED;
if (cqr->callback_data == DASD_SLEEPON_START_TAG)
cqr->callback_data = DASD_SLEEPON_END_TAG;
break;
case DASD_CQR_IN_IO:
/* request in IO - terminate IO and release again */
@ -3902,9 +3900,12 @@ static int dasd_generic_requeue_all_requests(struct dasd_device *device)
wait_event(dasd_flush_wq,
(cqr->status != DASD_CQR_CLEAR_PENDING));
/* mark sleepon requests as ended */
if (cqr->callback_data == DASD_SLEEPON_START_TAG)
cqr->callback_data = DASD_SLEEPON_END_TAG;
/*
* requeue requests to blocklayer will only work
* for block device requests
*/
if (_dasd_requeue_request(cqr))
continue;
/* remove requests from device and block queue */
list_del_init(&cqr->devlist);
@ -3917,13 +3918,6 @@ static int dasd_generic_requeue_all_requests(struct dasd_device *device)
cqr = refers;
}
/*
* requeue requests to blocklayer will only work
* for block device requests
*/
if (_dasd_requeue_request(cqr))
continue;
if (cqr->block)
list_del_init(&cqr->blocklist);
cqr->block->base->discipline->free_cp(
@ -3940,8 +3934,7 @@ static int dasd_generic_requeue_all_requests(struct dasd_device *device)
list_splice_tail(&requeue_queue, &device->ccw_queue);
spin_unlock_irq(get_ccwdev_lock(device->cdev));
}
/* wake up generic waitqueue for eventually ended sleepon requests */
wake_up(&generic_waitq);
dasd_schedule_device_bh(device);
return rc;
}

7
drivers/s390/cio/device_fsm.c
View File

@ -795,6 +795,7 @@ ccw_device_online_timeout(struct ccw_device *cdev, enum dev_event dev_event)
ccw_device_set_timeout(cdev, 0);
cdev->private->iretry = 255;
cdev->private->async_kill_io_rc = -ETIMEDOUT;
ret = ccw_device_cancel_halt_clear(cdev);
if (ret == -EBUSY) {
ccw_device_set_timeout(cdev, 3*HZ);
@ -871,7 +872,7 @@ ccw_device_killing_irq(struct ccw_device *cdev, enum dev_event dev_event)
/* OK, i/o is dead now. Call interrupt handler. */
if (cdev->handler)
cdev->handler(cdev, cdev->private->intparm,
ERR_PTR(-EIO));
ERR_PTR(cdev->private->async_kill_io_rc));
}
static void
@ -888,14 +889,16 @@ ccw_device_killing_timeout(struct ccw_device *cdev, enum dev_event dev_event)
ccw_device_online_verify(cdev, 0);
if (cdev->handler)
cdev->handler(cdev, cdev->private->intparm,
ERR_PTR(-EIO));
ERR_PTR(cdev->private->async_kill_io_rc));
}
void ccw_device_kill_io(struct ccw_device *cdev)
{
int ret;
ccw_device_set_timeout(cdev, 0);
cdev->private->iretry = 255;
cdev->private->async_kill_io_rc = -EIO;
ret = ccw_device_cancel_halt_clear(cdev);
if (ret == -EBUSY) {
ccw_device_set_timeout(cdev, 3*HZ);

72
drivers/s390/cio/device_ops.c
View File

@ -159,7 +159,7 @@ int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
}
/**
* ccw_device_start_key() - start a s390 channel program with key
* ccw_device_start_timeout_key() - start a s390 channel program with timeout and key
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
@ -170,10 +170,15 @@ int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
* @key: storage key to be used for the I/O
* @flags: additional flags; defines the action to be performed for I/O
* processing.
* @expires: timeout value in jiffies
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* This function notifies the device driver if the channel program has not
* completed during the time specified by @expires. If a timeout occurs, the
* channel program is terminated via xsch, hsch or csch, and the device's
* interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
@ -182,9 +187,9 @@ int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, __u8 key,
unsigned long flags)
int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, __u8 key,
unsigned long flags, int expires)
{
struct subchannel *sch;
int ret;
@ -224,6 +229,8 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
switch (ret) {
case 0:
cdev->private->intparm = intparm;
if (expires)
ccw_device_set_timeout(cdev, expires);
break;
case -EACCES:
case -ENODEV:
@ -234,7 +241,7 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
}
/**
* ccw_device_start_timeout_key() - start a s390 channel program with timeout and key
* ccw_device_start_key() - start a s390 channel program with key
* @cdev: target ccw device
* @cpa: logical start address of channel program
* @intparm: user specific interruption parameter; will be presented back to
@ -245,15 +252,10 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
* @key: storage key to be used for the I/O
* @flags: additional flags; defines the action to be performed for I/O
* processing.
* @expires: timeout value in jiffies
*
* Start a S/390 channel program. When the interrupt arrives, the
* IRQ handler is called, either immediately, delayed (dev-end missing,
* or sense required) or never (no IRQ handler registered).
* This function notifies the device driver if the channel program has not
* completed during the time specified by @expires. If a timeout occurs, the
* channel program is terminated via xsch, hsch or csch, and the device's
* interrupt handler will be called with an irb containing ERR_PTR(-%ETIMEDOUT).
* Returns:
* %0, if the operation was successful;
* -%EBUSY, if the device is busy, or status pending;
@ -262,19 +264,12 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
* Context:
* Interrupts disabled, ccw device lock held
*/
int ccw_device_start_timeout_key(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, __u8 key,
unsigned long flags, int expires)
int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
unsigned long intparm, __u8 lpm, __u8 key,
unsigned long flags)
{
int ret;
if (!cdev)
return -ENODEV;
ccw_device_set_timeout(cdev, expires);
ret = ccw_device_start_key(cdev, cpa, intparm, lpm, key, flags);
if (ret != 0)
ccw_device_set_timeout(cdev, 0);
return ret;
return ccw_device_start_timeout_key(cdev, cpa, intparm, lpm, key,
flags, 0);
}
/**
@ -489,18 +484,20 @@ void ccw_device_get_id(struct ccw_device *cdev, struct ccw_dev_id *dev_id)
EXPORT_SYMBOL(ccw_device_get_id);
/**
* ccw_device_tm_start_key() - perform start function
* ccw_device_tm_start_timeout_key() - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
* @key: storage key to use for storage access
* @expires: time span in jiffies after which to abort request
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key)
int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key,
int expires)
{
struct subchannel *sch;
int rc;
@ -527,37 +524,32 @@ int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
return -EACCES;
}
rc = cio_tm_start_key(sch, tcw, lpm, key);
if (rc == 0)
if (rc == 0) {
cdev->private->intparm = intparm;
if (expires)
ccw_device_set_timeout(cdev, expires);
}
return rc;
}
EXPORT_SYMBOL(ccw_device_tm_start_key);
EXPORT_SYMBOL(ccw_device_tm_start_timeout_key);
/**
* ccw_device_tm_start_timeout_key() - perform start function
* ccw_device_tm_start_key() - perform start function
* @cdev: ccw device on which to perform the start function
* @tcw: transport-command word to be started
* @intparm: user defined parameter to be passed to the interrupt handler
* @lpm: mask of paths to use
* @key: storage key to use for storage access
* @expires: time span in jiffies after which to abort request
*
* Start the tcw on the given ccw device. Return zero on success, non-zero
* otherwise.
*/
int ccw_device_tm_start_timeout_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key,
int expires)
int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw,
unsigned long intparm, u8 lpm, u8 key)
{
int ret;
ccw_device_set_timeout(cdev, expires);
ret = ccw_device_tm_start_key(cdev, tcw, intparm, lpm, key);
if (ret != 0)
ccw_device_set_timeout(cdev, 0);
return ret;
return ccw_device_tm_start_timeout_key(cdev, tcw, intparm, lpm, key, 0);
}
EXPORT_SYMBOL(ccw_device_tm_start_timeout_key);
EXPORT_SYMBOL(ccw_device_tm_start_key);
/**
* ccw_device_tm_start() - perform start function

1
drivers/s390/cio/io_sch.h
View File

@ -157,6 +157,7 @@ struct ccw_device_private {
unsigned long intparm; /* user interruption parameter */
struct qdio_irq *qdio_data;
struct irb irb; /* device status */
int async_kill_io_rc;
struct senseid senseid; /* SenseID info */
struct pgid pgid[8]; /* path group IDs per chpid*/
struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */