Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756573AbZKMPK6 (ORCPT ); Fri, 13 Nov 2009 10:10:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756285AbZKMPKy (ORCPT ); Fri, 13 Nov 2009 10:10:54 -0500 Received: from mtagate4.de.ibm.com ([195.212.17.164]:36512 "EHLO mtagate4.de.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756190AbZKMPJJ (ORCPT ); Fri, 13 Nov 2009 10:09:09 -0500 Message-Id: <20091113150916.765762750@de.ibm.com> User-Agent: quilt/0.48-1 Date: Fri, 13 Nov 2009 16:09:06 +0100 From: Martin Schwidefsky To: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Cc: Heiko Carstens , Peter Oberparleiter , Martin Schwidefsky Subject: [patch 42/52] [PATCH] cio: use sense-pgid operation for path verification References: <20091113150824.351347652@de.ibm.com> Content-Disposition: inline; filename=141-cio-path-verification.diff Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 10445 Lines: 335 From: Peter Oberparleiter Set-pgid operations fail for some device types under z/VM for which the hypervisor has already set the pgid. Also reserved devices or changed pgids are not correctly recognized. Fix these problems by using a combination of sense-pgid and set-pgid and by also accepting pre-defined pgid settings. Signed-off-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/device.h | 3 drivers/s390/cio/device_fsm.c | 41 +---------- drivers/s390/cio/device_pgid.c | 148 ++++++++++++++++++++++++++--------------- drivers/s390/cio/io_sch.h | 1 4 files changed, 99 insertions(+), 94 deletions(-) Index: quilt-2.6/drivers/s390/cio/device_fsm.c =================================================================== --- quilt-2.6.orig/drivers/s390/cio/device_fsm.c 2009-11-13 16:08:21.000000000 +0100 +++ quilt-2.6/drivers/s390/cio/device_fsm.c 2009-11-13 16:08:21.000000000 +0100 @@ -395,33 +395,6 @@ } /* - * Function called from device_pgid.c after sense path ground has completed. - */ -void -ccw_device_sense_pgid_done(struct ccw_device *cdev, int err) -{ - struct subchannel *sch; - - sch = to_subchannel(cdev->dev.parent); - switch (err) { - case -EOPNOTSUPP: /* path grouping not supported, use nop instead. */ - case 0: /* success */ - case -EACCES: /* partial success, some paths not operational */ - break; - case -ETIME: /* Sense path group id stopped by timeout. */ - case -EUSERS: /* device is reserved for someone else. */ - ccw_device_done(cdev, DEV_STATE_BOXED); - return; - default: - ccw_device_done(cdev, DEV_STATE_NOT_OPER); - return; - } - /* Start Path Group verification. */ - cdev->private->state = DEV_STATE_VERIFY; - ccw_device_verify_start(cdev); -} - -/* * Start device recognition. */ void ccw_device_recognition(struct ccw_device *cdev) @@ -503,6 +476,7 @@ } break; case -ETIME: + case -EUSERS: /* Reset oper notify indication after verify error. */ cdev->private->flags.donotify = 0; ccw_device_done(cdev, DEV_STATE_BOXED); @@ -540,16 +514,9 @@ dev_fsm_event(cdev, DEV_EVENT_NOTOPER); return ret; } - /* Do we want to do path grouping? */ - if (!cdev->private->options.pgroup) { - /* Start initial path verification. */ - cdev->private->state = DEV_STATE_VERIFY; - ccw_device_verify_start(cdev); - return 0; - } - /* Do a SensePGID first. */ - cdev->private->state = DEV_STATE_SENSE_PGID; - ccw_device_sense_pgid_start(cdev); + /* Start initial path verification. */ + cdev->private->state = DEV_STATE_VERIFY; + ccw_device_verify_start(cdev); return 0; } Index: quilt-2.6/drivers/s390/cio/device.h =================================================================== --- quilt-2.6.orig/drivers/s390/cio/device.h 2009-11-13 16:08:20.000000000 +0100 +++ quilt-2.6/drivers/s390/cio/device.h 2009-11-13 16:08:21.000000000 +0100 @@ -110,9 +110,6 @@ void ccw_device_sense_id_done(struct ccw_device *, int); /* Function prototypes for path grouping stuff. */ -void ccw_device_sense_pgid_start(struct ccw_device *); -void ccw_device_sense_pgid_done(struct ccw_device *, int); - void ccw_device_verify_start(struct ccw_device *); void ccw_device_verify_done(struct ccw_device *, int); Index: quilt-2.6/drivers/s390/cio/device_pgid.c =================================================================== --- quilt-2.6.orig/drivers/s390/cio/device_pgid.c 2009-11-13 16:08:21.000000000 +0100 +++ quilt-2.6/drivers/s390/cio/device_pgid.c 2009-11-13 16:08:21.000000000 +0100 @@ -141,8 +141,8 @@ struct ccw_request *req = &cdev->private->req; u8 fn; - /* Adjust lpm if paths are not set in pam. */ - req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam); + /* Use next available path that is not already in correct state. */ + req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & ~sch->vpm); if (!req->lpm) goto out_nopath; /* Channel program setup. */ @@ -199,6 +199,19 @@ verify_done(cdev, rc); } +static void spid_start(struct ccw_device *cdev) +{ + struct ccw_request *req = &cdev->private->req; + + /* Initialize request data. */ + memset(req, 0, sizeof(*req)); + req->timeout = PGID_TIMEOUT; + req->maxretries = PGID_RETRIES; + req->lpm = 0x80; + req->callback = spid_callback; + spid_do(cdev); +} + static int pgid_cmp(struct pgid *p1, struct pgid *p2) { return memcmp((char *) p1 + 1, (char *) p2 + 1, @@ -241,6 +254,40 @@ *p = first; } +static u8 pgid_to_vpm(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct pgid *pgid; + int i; + int lpm; + u8 vpm = 0; + + /* Set VPM bits for paths which are already in the target state. */ + for (i = 0; i < 8; i++) { + lpm = 0x80 >> i; + if ((cdev->private->pgid_valid_mask & lpm) == 0) + continue; + pgid = &cdev->private->pgid[i]; + if (sch->opm & lpm) { + if (pgid->inf.ps.state1 != SNID_STATE1_GROUPED) + continue; + } else { + if (pgid->inf.ps.state1 != SNID_STATE1_UNGROUPED) + continue; + } + if (cdev->private->flags.mpath) { + if (pgid->inf.ps.state3 != SNID_STATE3_MULTI_PATH) + continue; + } else { + if (pgid->inf.ps.state3 != SNID_STATE3_SINGLE_PATH) + continue; + } + vpm |= lpm; + } + + return vpm; +} + static void pgid_fill(struct ccw_device *cdev, struct pgid *pgid) { int i; @@ -255,6 +302,7 @@ static void snid_done(struct ccw_device *cdev, int rc) { struct ccw_dev_id *id = &cdev->private->dev_id; + struct subchannel *sch = to_subchannel(cdev->dev.parent); struct pgid *pgid; int mismatch = 0; int reserved = 0; @@ -263,18 +311,38 @@ if (rc) goto out; pgid_analyze(cdev, &pgid, &mismatch, &reserved, &reset); - if (!mismatch) { - pgid_fill(cdev, pgid); - cdev->private->flags.pgid_rdy = 1; - } if (reserved) rc = -EUSERS; + else if (mismatch) + rc = -EOPNOTSUPP; + else { + sch->vpm = pgid_to_vpm(cdev); + pgid_fill(cdev, pgid); + } out: - CIO_MSG_EVENT(2, "snid: device 0.%x.%04x: rc=%d pvm=%02x mism=%d " - "rsvd=%d reset=%d\n", id->ssid, id->devno, rc, - cdev->private->pgid_valid_mask, mismatch, reserved, - reset); - ccw_device_sense_pgid_done(cdev, rc); + CIO_MSG_EVENT(2, "snid: device 0.%x.%04x: rc=%d pvm=%02x vpm=%02x " + "mism=%d rsvd=%d reset=%d\n", id->ssid, id->devno, rc, + cdev->private->pgid_valid_mask, sch->vpm, mismatch, + reserved, reset); + switch (rc) { + case 0: + /* Anything left to do? */ + if (sch->vpm == sch->schib.pmcw.pam) { + verify_done(cdev, sch->vpm == 0 ? -EACCES : 0); + return; + } + /* Perform path-grouping. */ + spid_start(cdev); + break; + case -EOPNOTSUPP: + /* Path-grouping not supported. */ + cdev->private->flags.pgroup = 0; + cdev->private->flags.mpath = 0; + verify_start(cdev); + break; + default: + verify_done(cdev, rc); + } } /* @@ -333,33 +401,6 @@ snid_done(cdev, rc); } -/** - * ccw_device_sense_pgid_start - perform SENSE PGID - * @cdev: ccw device - * - * Execute a SENSE PGID channel program on each path to @cdev to update its - * PGID information. When finished, call ccw_device_sense_id_done with a - * return code specifying the result. - */ -void ccw_device_sense_pgid_start(struct ccw_device *cdev) -{ - struct ccw_request *req = &cdev->private->req; - - CIO_TRACE_EVENT(4, "snid"); - CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); - /* Initialize PGID data. */ - memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid)); - cdev->private->flags.pgid_rdy = 0; - cdev->private->pgid_valid_mask = 0; - /* Initialize request data. */ - memset(req, 0, sizeof(*req)); - req->timeout = PGID_TIMEOUT; - req->maxretries = PGID_RETRIES; - req->callback = snid_callback; - req->lpm = 0x80; - snid_do(cdev); -} - /* * Perform path verification. */ @@ -367,6 +408,7 @@ { struct subchannel *sch = to_subchannel(cdev->dev.parent); struct ccw_request *req = &cdev->private->req; + struct ccw_dev_id *devid = &cdev->private->dev_id; sch->vpm = 0; /* Initialize request data. */ @@ -375,9 +417,13 @@ req->maxretries = PGID_RETRIES; req->lpm = 0x80; if (cdev->private->flags.pgroup) { - req->callback = spid_callback; - spid_do(cdev); + CIO_TRACE_EVENT(4, "snid"); + CIO_HEX_EVENT(4, devid, sizeof(*devid)); + req->callback = snid_callback; + snid_do(cdev); } else { + CIO_TRACE_EVENT(4, "nop"); + CIO_HEX_EVENT(4, devid, sizeof(*devid)); req->filter = nop_filter; req->callback = nop_callback; nop_do(cdev); @@ -398,19 +444,15 @@ { CIO_TRACE_EVENT(4, "vrfy"); CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); - if (!cdev->private->flags.pgid_rdy) { - /* No pathgrouping possible. */ - cdev->private->flags.pgroup = 0; - cdev->private->flags.mpath = 0; - } else { - /* - * Initialize pathgroup and multipath state with target values. - * They may change in the course of path verification. - */ - cdev->private->flags.pgroup = cdev->private->options.pgroup; - cdev->private->flags.mpath = cdev->private->options.mpath; - - } + /* Initialize PGID data. */ + memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid)); + cdev->private->pgid_valid_mask = 0; + /* + * Initialize pathgroup and multipath state with target values. + * They may change in the course of path verification. + */ + cdev->private->flags.pgroup = cdev->private->options.pgroup; + cdev->private->flags.mpath = cdev->private->options.mpath; cdev->private->flags.doverify = 0; verify_start(cdev); } Index: quilt-2.6/drivers/s390/cio/io_sch.h =================================================================== --- quilt-2.6.orig/drivers/s390/cio/io_sch.h 2009-11-13 16:08:21.000000000 +0100 +++ quilt-2.6/drivers/s390/cio/io_sch.h 2009-11-13 16:08:21.000000000 +0100 @@ -166,7 +166,6 @@ unsigned int recog_done:1; /* dev. recog. complete */ unsigned int fake_irb:1; /* deliver faked irb */ unsigned int resuming:1; /* recognition while resume */ - unsigned int pgid_rdy:1; /* pgids are ready */ unsigned int pgroup:1; /* pathgroup is set up */ unsigned int mpath:1; /* multipathing is set up */ } __attribute__((packed)) flags; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/