diff options
author | Jan Glauber <jang@linux.vnet.ibm.com> | 2011-01-05 12:47:52 +0100 |
---|---|---|
committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-01-05 12:47:28 +0100 |
commit | 958c0ba403cb6a693b54be2389f9ef53377fa259 (patch) | |
tree | 7fb99145dc1254c136081cf492dcc75b11a8e723 /drivers/s390 | |
parent | 0195843bfda90a215f3b72c9aac2fd0bc9244b67 (diff) | |
download | op-kernel-dev-958c0ba403cb6a693b54be2389f9ef53377fa259.zip op-kernel-dev-958c0ba403cb6a693b54be2389f9ef53377fa259.tar.gz |
[S390] qdio: use proper QEBSM operand for SIGA-R and SIGA-S
If QIOASSIST is enabled for a qdio device the SIGA instruction requires
a modified function code. This function code modifier was missing for
SIGA-R and SIGA-S which can lead to a kernel panic caused by an
operand exception.
Cc: stable@kernel.org
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r-- | drivers/s390/cio/qdio.h | 6 | ||||
-rw-r--r-- | drivers/s390/cio/qdio_main.c | 43 |
2 files changed, 34 insertions, 15 deletions
diff --git a/drivers/s390/cio/qdio.h b/drivers/s390/cio/qdio.h index 40ca0b9..0a42da4 100644 --- a/drivers/s390/cio/qdio.h +++ b/drivers/s390/cio/qdio.h @@ -91,6 +91,12 @@ enum qdio_irq_states { #define AC1_SC_QEBSM_AVAILABLE 0x02 /* available for subchannel */ #define AC1_SC_QEBSM_ENABLED 0x01 /* enabled for subchannel */ +/* SIGA flags */ +#define QDIO_SIGA_WRITE 0x00 +#define QDIO_SIGA_READ 0x01 +#define QDIO_SIGA_SYNC 0x02 +#define QDIO_SIGA_QEBSM_FLAG 0x80 + #ifdef CONFIG_64BIT static inline int do_sqbs(u64 token, unsigned char state, int queue, int *start, int *count) diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index af86875..9982347 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -30,11 +30,12 @@ MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>,"\ MODULE_DESCRIPTION("QDIO base support"); MODULE_LICENSE("GPL"); -static inline int do_siga_sync(struct subchannel_id schid, - unsigned int out_mask, unsigned int in_mask) +static inline int do_siga_sync(unsigned long schid, + unsigned int out_mask, unsigned int in_mask, + unsigned int fc) { - register unsigned long __fc asm ("0") = 2; - register struct subchannel_id __schid asm ("1") = schid; + register unsigned long __fc asm ("0") = fc; + register unsigned long __schid asm ("1") = schid; register unsigned long out asm ("2") = out_mask; register unsigned long in asm ("3") = in_mask; int cc; @@ -48,10 +49,11 @@ static inline int do_siga_sync(struct subchannel_id schid, return cc; } -static inline int do_siga_input(struct subchannel_id schid, unsigned int mask) +static inline int do_siga_input(unsigned long schid, unsigned int mask, + unsigned int fc) { - register unsigned long __fc asm ("0") = 1; - register struct subchannel_id __schid asm ("1") = schid; + register unsigned long __fc asm ("0") = fc; + register unsigned long __schid asm ("1") = schid; register unsigned long __mask asm ("2") = mask; int cc; @@ -280,6 +282,8 @@ void qdio_init_buf_states(struct qdio_irq *irq_ptr) static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, unsigned int input) { + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_SYNC; int cc; if (!need_siga_sync(q)) @@ -288,7 +292,12 @@ static inline int qdio_siga_sync(struct qdio_q *q, unsigned int output, DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-s:%1d", q->nr); qperf_inc(q, siga_sync); - cc = do_siga_sync(q->irq_ptr->schid, output, input); + if (is_qebsm(q)) { + schid = q->irq_ptr->sch_token; + fc |= QDIO_SIGA_QEBSM_FLAG; + } + + cc = do_siga_sync(schid, output, input, fc); if (cc) DBF_ERROR("%4x SIGA-S:%2d", SCH_NO(q), cc); return cc; @@ -314,8 +323,8 @@ static inline int qdio_siga_sync_all(struct qdio_q *q) static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) { - unsigned long schid; - unsigned int fc = 0; + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_WRITE; u64 start_time = 0; int cc; @@ -324,11 +333,8 @@ static int qdio_siga_output(struct qdio_q *q, unsigned int *busy_bit) if (is_qebsm(q)) { schid = q->irq_ptr->sch_token; - fc |= 0x80; + fc |= QDIO_SIGA_QEBSM_FLAG; } - else - schid = *((u32 *)&q->irq_ptr->schid); - again: cc = do_siga_output(schid, q->mask, busy_bit, fc); @@ -348,12 +354,19 @@ again: static inline int qdio_siga_input(struct qdio_q *q) { + unsigned long schid = *((u32 *) &q->irq_ptr->schid); + unsigned int fc = QDIO_SIGA_READ; int cc; DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "siga-r:%1d", q->nr); qperf_inc(q, siga_read); - cc = do_siga_input(q->irq_ptr->schid, q->mask); + if (is_qebsm(q)) { + schid = q->irq_ptr->sch_token; + fc |= QDIO_SIGA_QEBSM_FLAG; + } + + cc = do_siga_input(schid, q->mask, fc); if (cc) DBF_ERROR("%4x SIGA-R:%2d", SCH_NO(q), cc); return cc; |