From b49e648fcca7e420c4ad670a548e19f0e8531c30 Mon Sep 17 00:00:00 2001 From: Stefan Haberland Date: Wed, 23 Nov 2022 17:07:17 +0100 Subject: s390/dasd: increase printing of debug data payload 32 byte are to less for important data from prefix or other commands. Print up to 128 byte data. This is enough for the largest CCW data we have. Since printk can only print up to 1024 byte at once, print the different parts of the CCW dumps separately. Signed-off-by: Stefan Haberland Reviewed-by: Jan Hoeppner Link: https://lore.kernel.org/r/20221123160719.3002694-3-sth@linux.ibm.com Signed-off-by: Jens Axboe --- drivers/s390/block/dasd_eckd.c | 37 +++++++++++++++++++------------------ 1 file changed, 19 insertions(+), 18 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 662730f3b027..85bf045c2ff9 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -5500,7 +5500,7 @@ dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp) * Dump the range of CCWs into 'page' buffer * and return number of printed chars. */ -static int +static void dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page) { int len, count; @@ -5518,16 +5518,21 @@ dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page) else datap = (char *) ((addr_t) from->cda); - /* dump data (max 32 bytes) */ - for (count = 0; count < from->count && count < 32; count++) { - if (count % 8 == 0) len += sprintf(page + len, " "); - if (count % 4 == 0) len += sprintf(page + len, " "); + /* dump data (max 128 bytes) */ + for (count = 0; count < from->count && count < 128; count++) { + if (count % 32 == 0) + len += sprintf(page + len, "\n"); + if (count % 8 == 0) + len += sprintf(page + len, " "); + if (count % 4 == 0) + len += sprintf(page + len, " "); len += sprintf(page + len, "%02x", datap[count]); } len += sprintf(page + len, "\n"); from++; } - return len; + if (len > 0) + printk(KERN_ERR "%s", page); } static void @@ -5619,37 +5624,33 @@ static void dasd_eckd_dump_sense_ccw(struct dasd_device *device, if (req) { /* req == NULL for unsolicited interrupts */ /* dump the Channel Program (max 140 Bytes per line) */ - /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */ + /* Count CCW and print first CCWs (maximum 7) */ first = req->cpaddr; for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++); to = min(first + 6, last); - len = sprintf(page, PRINTK_HEADER - " Related CP in req: %p\n", req); - dasd_eckd_dump_ccw_range(first, to, page + len); - printk(KERN_ERR "%s", page); + printk(KERN_ERR PRINTK_HEADER " Related CP in req: %p\n", req); + dasd_eckd_dump_ccw_range(first, to, page); /* print failing CCW area (maximum 4) */ /* scsw->cda is either valid or zero */ - len = 0; from = ++to; fail = (struct ccw1 *)(addr_t) irb->scsw.cmd.cpa; /* failing CCW */ if (from < fail - 2) { from = fail - 2; /* there is a gap - print header */ - len += sprintf(page, PRINTK_HEADER "......\n"); + printk(KERN_ERR PRINTK_HEADER "......\n"); } to = min(fail + 1, last); - len += dasd_eckd_dump_ccw_range(from, to, page + len); + dasd_eckd_dump_ccw_range(from, to, page + len); /* print last CCWs (maximum 2) */ + len = 0; from = max(from, ++to); if (from < last - 1) { from = last - 1; /* there is a gap - print header */ - len += sprintf(page + len, PRINTK_HEADER "......\n"); + printk(KERN_ERR PRINTK_HEADER "......\n"); } - len += dasd_eckd_dump_ccw_range(from, last, page + len); - if (len > 0) - printk(KERN_ERR "%s", page); + dasd_eckd_dump_ccw_range(from, last, page + len); } free_page((unsigned long) page); } -- cgit v1.2.3