diff options
| author | Jan Glauber <jang@linux.vnet.ibm.com> | 2011-01-05 12:47:52 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-21 12:44:45 -0700 |
| commit | 68ba505969284c6dacaea7e36c5bee4528847189 (patch) | |
| tree | 10b24cd88c6ea026b9a7857a3331e6f863169f11 /drivers/s390/cio/qdio_main.c | |
| parent | f5aca15a9c1bb8b4ca7d9ff657759ff121358b33 (diff) | |
qdio: use proper QEBSM operand for SIGA-R and SIGA-S
commit 958c0ba403cb6a693b54be2389f9ef53377fa259 upstream.
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.
Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/s390/cio/qdio_main.c')
| -rw-r--r-- | drivers/s390/cio/qdio_main.c | 43 |
1 files changed, 28 insertions, 15 deletions
diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 62b654af923..91e64de6889 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -28,11 +28,12 @@ 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; @@ -46,10 +47,11 @@ 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; @@ -278,6 +280,8 @@ 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)) @@ -286,7 +290,12 @@ 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; @@ -312,8 +321,8 @@ 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; @@ -322,11 +331,8 @@ 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); @@ -346,12 +352,19 @@ 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; |