From 63aef00b55d37e9fad837a8b38a2c261f0d32041 Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Tue, 27 May 2014 14:40:39 +0200 Subject: s390/lowcore: replace lowcore irb array with a per-cpu variable 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 Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/ccwreq.c | 2 +- drivers/s390/cio/chsc_sch.c | 2 +- drivers/s390/cio/cio.c | 9 ++++++--- drivers/s390/cio/cio.h | 2 ++ drivers/s390/cio/device_fsm.c | 4 ++-- drivers/s390/cio/eadm_sch.c | 2 +- 6 files changed, 13 insertions(+), 8 deletions(-) (limited to 'drivers/s390/cio') diff --git a/drivers/s390/cio/ccwreq.c b/drivers/s390/cio/ccwreq.c index fc5fb51d9bce..07676c22d514 100644 --- a/drivers/s390/cio/ccwreq.c +++ b/drivers/s390/cio/ccwreq.c @@ -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; diff --git a/drivers/s390/cio/chsc_sch.c b/drivers/s390/cio/chsc_sch.c index 1d3661af7bd8..3d22d2a4ce14 100644 --- a/drivers/s390/cio/chsc_sch.c +++ b/drivers/s390/cio/chsc_sch.c @@ -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)); diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index 9e058c4657a3..77f9c92df4b9 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -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; } diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h index d42f67412bd8..a01376ae1749 100644 --- a/drivers/s390/cio/cio.h +++ b/drivers/s390/cio/cio.h @@ -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); diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c index c7638c543250..0bc902b3cd84 100644 --- a/drivers/s390/cio/device_fsm.c +++ b/drivers/s390/cio/device_fsm.c @@ -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)) { diff --git a/drivers/s390/cio/eadm_sch.c b/drivers/s390/cio/eadm_sch.c index 3a2ee4a740b4..c4f7bf3e24c2 100644 --- a/drivers/s390/cio/eadm_sch.c +++ b/drivers/s390/cio/eadm_sch.c @@ -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"); -- cgit v1.2.3