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s390/lowcore: replace lowcore irb array with a per-cpu variable

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Remove the 96-byte irb array from the lowcore and create a per-cpu
variable instead. That way we will pick up any change in the definition
of the struct irb automatically.

Acked-By: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2014-05-27 14:40:39 +02:00
parent 993072ee67
commit 63aef00b55
8 changed files with 16 additions and 19 deletions
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13
arch/s390/include/asm/lowcore.h
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@ -143,10 +143,7 @@ struct _lowcore {
__u32 ftrace_func; /* 0x02f8 */
__u32 spinlock_lockval; /* 0x02fc */
/* Interrupt response block */
__u8 irb[96]; /* 0x0300 */
__u8 pad_0x0360[0x0e00-0x0360]; /* 0x0360 */
__u8 pad_0x0300[0x0e00-0x0300]; /* 0x0300 */
/*
* 0xe00 contains the address of the IPL Parameter Information
@ -292,14 +289,10 @@ struct _lowcore {
__u32 spinlock_lockval; /* 0x03a0 */
__u8 pad_0x03a0[0x0400-0x03a4]; /* 0x03a4 */
/* Interrupt response block. */
__u8 irb[96]; /* 0x0400 */
__u8 pad_0x0460[0x0480-0x0460]; /* 0x0460 */
/* Per cpu primary space access list */
__u32 paste[16]; /* 0x0480 */
__u32 paste[16]; /* 0x0400 */
__u8 pad_0x04c0[0x0e00-0x04c0]; /* 0x04c0 */
__u8 pad_0x04c0[0x0e00-0x0440]; /* 0x0440 */
/*
* 0xe00 contains the address of the IPL Parameter Information

1
arch/s390/kernel/asm-offsets.c
View File

@ -144,7 +144,6 @@ int main(void)
DEFINE(__LC_MCCK_CLOCK, offsetof(struct _lowcore, mcck_clock));
DEFINE(__LC_MACHINE_FLAGS, offsetof(struct _lowcore, machine_flags));
DEFINE(__LC_FTRACE_FUNC, offsetof(struct _lowcore, ftrace_func));
DEFINE(__LC_IRB, offsetof(struct _lowcore, irb));
DEFINE(__LC_DUMP_REIPL, offsetof(struct _lowcore, ipib));
BLANK();
DEFINE(__LC_CPU_TIMER_SAVE_AREA, offsetof(struct _lowcore, cpu_timer_save_area));

2
drivers/s390/cio/ccwreq.c
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@ -252,7 +252,7 @@ static void ccwreq_log_status(struct ccw_device *cdev, enum io_status status)
*/
void ccw_request_handler(struct ccw_device *cdev)
{
struct irb *irb = (struct irb *)&S390_lowcore.irb;
struct irb *irb = &__get_cpu_var(cio_irb);
struct ccw_request *req = &cdev->private->req;
enum io_status status;
int rc = -EOPNOTSUPP;

2
drivers/s390/cio/chsc_sch.c
View File

@ -58,7 +58,7 @@ static void chsc_subchannel_irq(struct subchannel *sch)
{
struct chsc_private *private = dev_get_drvdata(&sch->dev);
struct chsc_request *request = private->request;
struct irb *irb = (struct irb *)&S390_lowcore.irb;
struct irb *irb = &__get_cpu_var(cio_irb);
CHSC_LOG(4, "irb");
CHSC_LOG_HEX(4, irb, sizeof(*irb));

9
drivers/s390/cio/cio.c
View File

@ -46,6 +46,9 @@ debug_info_t *cio_debug_msg_id;
debug_info_t *cio_debug_trace_id;
debug_info_t *cio_debug_crw_id;
DEFINE_PER_CPU_ALIGNED(struct irb, cio_irb);
EXPORT_PER_CPU_SYMBOL(cio_irb);
/*
* Function: cio_debug_init
* Initializes three debug logs for common I/O:
@ -560,7 +563,7 @@ static irqreturn_t do_cio_interrupt(int irq, void *dummy)
__this_cpu_write(s390_idle.nohz_delay, 1);
tpi_info = (struct tpi_info *) &get_irq_regs()->int_code;
irb = (struct irb *) &S390_lowcore.irb;
irb = &__get_cpu_var(cio_irb);
sch = (struct subchannel *)(unsigned long) tpi_info->intparm;
if (!sch) {
/* Clear pending interrupt condition. */
@ -609,7 +612,7 @@ void cio_tsch(struct subchannel *sch)
struct irb *irb;
int irq_context;
irb = (struct irb *)&S390_lowcore.irb;
irb = &__get_cpu_var(cio_irb);
/* Store interrupt response block to lowcore. */
if (tsch(sch->schid, irb) != 0)
/* Not status pending or not operational. */
@ -746,7 +749,7 @@ __clear_io_subchannel_easy(struct subchannel_id schid)
struct tpi_info ti;
if (tpi(&ti)) {
tsch(ti.schid, (struct irb *)&S390_lowcore.irb);
tsch(ti.schid, &__get_cpu_var(cio_irb));
if (schid_equal(&ti.schid, &schid))
return 0;
}

2
drivers/s390/cio/cio.h
View File

@ -102,6 +102,8 @@ struct subchannel {
struct schib_config config;
} __attribute__ ((aligned(8)));
DECLARE_PER_CPU(struct irb, cio_irb);
#define to_subchannel(n) container_of(n, struct subchannel, dev)
extern int cio_validate_subchannel (struct subchannel *, struct subchannel_id);

4
drivers/s390/cio/device_fsm.c
View File

@ -739,7 +739,7 @@ ccw_device_irq(struct ccw_device *cdev, enum dev_event dev_event)
struct irb *irb;
int is_cmd;
irb = (struct irb *)&S390_lowcore.irb;
irb = &__get_cpu_var(cio_irb);
is_cmd = !scsw_is_tm(&irb->scsw);
/* Check for unsolicited interrupt. */
if (!scsw_is_solicited(&irb->scsw)) {
@ -805,7 +805,7 @@ ccw_device_w4sense(struct ccw_device *cdev, enum dev_event dev_event)
{
struct irb *irb;
irb = (struct irb *)&S390_lowcore.irb;
irb = &__get_cpu_var(cio_irb);
/* Check for unsolicited interrupt. */
if (scsw_stctl(&irb->scsw) ==
(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {

2
drivers/s390/cio/eadm_sch.c
View File

@ -134,7 +134,7 @@ static void eadm_subchannel_irq(struct subchannel *sch)
{
struct eadm_private *private = get_eadm_private(sch);
struct eadm_scsw *scsw = &sch->schib.scsw.eadm;
struct irb *irb = (struct irb *)&S390_lowcore.irb;
struct irb *irb = &__get_cpu_var(cio_irb);
int error = 0;
EADM_LOG(6, "irq");