From 18d6624ec5e628fa35e46a5d69abfce3d5fea363 Mon Sep 17 00:00:00 2001 From: Stefan Haberland Date: Wed, 9 Oct 2013 14:30:08 +0200 Subject: s390/dasd: check for availability of prefix command during format The prefix command is used instead of a define extent to make use of PAV alias devices during format. On some older storage servers the prefix command may not be available and the IO request will fail. Check for availability of prefix command and use define extent if not available. Signed-off-by: Stefan Haberland Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dasd_eckd.c | 98 ++++++++++++++++++++++++++++++------------ 1 file changed, 71 insertions(+), 27 deletions(-) (limited to 'drivers') diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 5adb2042e824..cee7e2708a1f 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -2077,6 +2077,7 @@ dasd_eckd_build_format(struct dasd_device *base, int intensity = 0; int r0_perm; int nr_tracks; + int use_prefix; startdev = dasd_alias_get_start_dev(base); if (!startdev) @@ -2106,28 +2107,46 @@ dasd_eckd_build_format(struct dasd_device *base, intensity = fdata->intensity; } + use_prefix = base_priv->features.feature[8] & 0x01; + switch (intensity) { case 0x00: /* Normal format */ case 0x08: /* Normal format, use cdl. */ cplength = 2 + (rpt*nr_tracks); - datasize = sizeof(struct PFX_eckd_data) + - sizeof(struct LO_eckd_data) + - rpt * nr_tracks * sizeof(struct eckd_count); + if (use_prefix) + datasize = sizeof(struct PFX_eckd_data) + + sizeof(struct LO_eckd_data) + + rpt * nr_tracks * sizeof(struct eckd_count); + else + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + rpt * nr_tracks * sizeof(struct eckd_count); break; case 0x01: /* Write record zero and format track. */ case 0x09: /* Write record zero and format track, use cdl. */ cplength = 2 + rpt * nr_tracks; - datasize = sizeof(struct PFX_eckd_data) + - sizeof(struct LO_eckd_data) + - sizeof(struct eckd_count) + - rpt * nr_tracks * sizeof(struct eckd_count); + if (use_prefix) + datasize = sizeof(struct PFX_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count) + + rpt * nr_tracks * sizeof(struct eckd_count); + else + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count) + + rpt * nr_tracks * sizeof(struct eckd_count); break; case 0x04: /* Invalidate track. */ case 0x0c: /* Invalidate track, use cdl. */ cplength = 3; - datasize = sizeof(struct PFX_eckd_data) + - sizeof(struct LO_eckd_data) + - sizeof(struct eckd_count); + if (use_prefix) + datasize = sizeof(struct PFX_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count); + else + datasize = sizeof(struct DE_eckd_data) + + sizeof(struct LO_eckd_data) + + sizeof(struct eckd_count); break; default: dev_warn(&startdev->cdev->dev, @@ -2147,14 +2166,25 @@ dasd_eckd_build_format(struct dasd_device *base, switch (intensity & ~0x08) { case 0x00: /* Normal format. */ - prefix(ccw++, (struct PFX_eckd_data *) data, - fdata->start_unit, fdata->stop_unit, - DASD_ECKD_CCW_WRITE_CKD, base, startdev); - /* grant subsystem permission to format R0 */ - if (r0_perm) - ((struct PFX_eckd_data *)data) - ->define_extent.ga_extended |= 0x04; - data += sizeof(struct PFX_eckd_data); + if (use_prefix) { + prefix(ccw++, (struct PFX_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_CKD, base, startdev); + /* grant subsystem permission to format R0 */ + if (r0_perm) + ((struct PFX_eckd_data *)data) + ->define_extent.ga_extended |= 0x04; + data += sizeof(struct PFX_eckd_data); + } else { + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_CKD, startdev); + /* grant subsystem permission to format R0 */ + if (r0_perm) + ((struct DE_eckd_data *) data) + ->ga_extended |= 0x04; + data += sizeof(struct DE_eckd_data); + } ccw[-1].flags |= CCW_FLAG_CC; locate_record(ccw++, (struct LO_eckd_data *) data, fdata->start_unit, 0, rpt*nr_tracks, @@ -2163,11 +2193,18 @@ dasd_eckd_build_format(struct dasd_device *base, data += sizeof(struct LO_eckd_data); break; case 0x01: /* Write record zero + format track. */ - prefix(ccw++, (struct PFX_eckd_data *) data, - fdata->start_unit, fdata->stop_unit, - DASD_ECKD_CCW_WRITE_RECORD_ZERO, - base, startdev); - data += sizeof(struct PFX_eckd_data); + if (use_prefix) { + prefix(ccw++, (struct PFX_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_RECORD_ZERO, + base, startdev); + data += sizeof(struct PFX_eckd_data); + } else { + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev); + data += sizeof(struct DE_eckd_data); + } ccw[-1].flags |= CCW_FLAG_CC; locate_record(ccw++, (struct LO_eckd_data *) data, fdata->start_unit, 0, rpt * nr_tracks + 1, @@ -2176,10 +2213,17 @@ dasd_eckd_build_format(struct dasd_device *base, data += sizeof(struct LO_eckd_data); break; case 0x04: /* Invalidate track. */ - prefix(ccw++, (struct PFX_eckd_data *) data, - fdata->start_unit, fdata->stop_unit, - DASD_ECKD_CCW_WRITE_CKD, base, startdev); - data += sizeof(struct PFX_eckd_data); + if (use_prefix) { + prefix(ccw++, (struct PFX_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_CKD, base, startdev); + data += sizeof(struct PFX_eckd_data); + } else { + define_extent(ccw++, (struct DE_eckd_data *) data, + fdata->start_unit, fdata->stop_unit, + DASD_ECKD_CCW_WRITE_CKD, startdev); + data += sizeof(struct DE_eckd_data); + } ccw[-1].flags |= CCW_FLAG_CC; locate_record(ccw++, (struct LO_eckd_data *) data, fdata->start_unit, 0, 1, -- cgit v1.2.2 From 9784bd4f1a6ea736ad9bf241f5a965e0a2913a5e Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Mon, 14 Oct 2013 14:26:08 +0200 Subject: s390/vmlogrdr: fix array access in vmlogrdr_open() Fix check within vmlogrdr_open() if the minor address is not larger than the number of array elements. Found with "smatch": drivers/s390/char/vmlogrdr.c:318 vmlogrdr_open() warn: buffer overflow 'sys_ser' 3 <= 3 Acked-by: Stefan Weinhuber Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- drivers/s390/char/vmlogrdr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c index 9b3a24e8d3a0..cf31d3321dab 100644 --- a/drivers/s390/char/vmlogrdr.c +++ b/drivers/s390/char/vmlogrdr.c @@ -313,7 +313,7 @@ static int vmlogrdr_open (struct inode *inode, struct file *filp) int ret; dev_num = iminor(inode); - if (dev_num > MAXMINOR) + if (dev_num >= MAXMINOR) return -ENODEV; logptr = &sys_ser[dev_num]; -- cgit v1.2.2 From 8c071b0f19dfa230335d22ce56a8fab5bd20cedc Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Thu, 17 Oct 2013 12:38:17 +0200 Subject: s390/time: correct use of store clock fast The result of the store-clock-fast (STCKF) instruction is a bit fuzzy. It can happen that the value stored on one CPU is smaller than the value stored on another CPU, although the order of the stores is the other way around. This can cause deltas of get_tod_clock() values to become negative when they should not be. We need to be more careful with store-clock-fast, this patch partially reverts git commit e4b7b4238e666682555461fa52eecd74652f36bb "time: always use stckf instead of stck if available". The get_tod_clock() function now uses the store-clock-extended (STCKE) instruction. get_tod_clock_fast() can be used if the fuzziness of store-clock-fast is acceptable e.g. for wait loops local to a CPU. Signed-off-by: Martin Schwidefsky --- drivers/s390/char/sclp.c | 4 ++-- drivers/s390/cio/cio.c | 4 ++-- drivers/s390/cio/qdio_main.c | 10 +++++----- 3 files changed, 9 insertions(+), 9 deletions(-) (limited to 'drivers') diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c index a3aa374799dc..1fe264379e0d 100644 --- a/drivers/s390/char/sclp.c +++ b/drivers/s390/char/sclp.c @@ -486,7 +486,7 @@ sclp_sync_wait(void) timeout = 0; if (timer_pending(&sclp_request_timer)) { /* Get timeout TOD value */ - timeout = get_tod_clock() + + timeout = get_tod_clock_fast() + sclp_tod_from_jiffies(sclp_request_timer.expires - jiffies); } @@ -508,7 +508,7 @@ sclp_sync_wait(void) while (sclp_running_state != sclp_running_state_idle) { /* Check for expired request timer */ if (timer_pending(&sclp_request_timer) && - get_tod_clock() > timeout && + get_tod_clock_fast() > timeout && del_timer(&sclp_request_timer)) sclp_request_timer.function(sclp_request_timer.data); cpu_relax(); diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c index d7da67a31c77..88e35d85d205 100644 --- a/drivers/s390/cio/cio.c +++ b/drivers/s390/cio/cio.c @@ -878,9 +878,9 @@ static void css_reset(void) atomic_inc(&chpid_reset_count); } /* Wait for machine check for all channel paths. */ - timeout = get_tod_clock() + (RCHP_TIMEOUT << 12); + timeout = get_tod_clock_fast() + (RCHP_TIMEOUT << 12); while (atomic_read(&chpid_reset_count) != 0) { - if (get_tod_clock() > timeout) + if (get_tod_clock_fast() > timeout) break; cpu_relax(); } diff --git a/drivers/s390/cio/qdio_main.c b/drivers/s390/cio/qdio_main.c index 8ed52aa49122..bbd3e511c771 100644 --- a/drivers/s390/cio/qdio_main.c +++ b/drivers/s390/cio/qdio_main.c @@ -338,10 +338,10 @@ again: retries++; if (!start_time) { - start_time = get_tod_clock(); + start_time = get_tod_clock_fast(); goto again; } - if ((get_tod_clock() - start_time) < QDIO_BUSY_BIT_PATIENCE) + if (get_tod_clock_fast() - start_time < QDIO_BUSY_BIT_PATIENCE) goto again; } if (retries) { @@ -504,7 +504,7 @@ static int get_inbound_buffer_frontier(struct qdio_q *q) int count, stop; unsigned char state = 0; - q->timestamp = get_tod_clock(); + q->timestamp = get_tod_clock_fast(); /* * Don't check 128 buffers, as otherwise qdio_inbound_q_moved @@ -595,7 +595,7 @@ static inline int qdio_inbound_q_done(struct qdio_q *q) * At this point we know, that inbound first_to_check * has (probably) not moved (see qdio_inbound_processing). */ - if (get_tod_clock() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { + if (get_tod_clock_fast() > q->u.in.timestamp + QDIO_INPUT_THRESHOLD) { DBF_DEV_EVENT(DBF_INFO, q->irq_ptr, "in done:%02x", q->first_to_check); return 1; @@ -728,7 +728,7 @@ static int get_outbound_buffer_frontier(struct qdio_q *q) int count, stop; unsigned char state = 0; - q->timestamp = get_tod_clock(); + q->timestamp = get_tod_clock_fast(); if (need_siga_sync(q)) if (((queue_type(q) != QDIO_IQDIO_QFMT) && -- cgit v1.2.2