diff options
Diffstat (limited to 'drivers/s390/cio/device_pgid.c')
| -rw-r--r-- | drivers/s390/cio/device_pgid.c | 123 |
1 files changed, 105 insertions, 18 deletions
diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c index 908d287f66c1..37ada05e82a5 100644 --- a/drivers/s390/cio/device_pgid.c +++ b/drivers/s390/cio/device_pgid.c @@ -23,6 +23,8 @@ #define PGID_RETRIES 256 #define PGID_TIMEOUT (10 * HZ) +static void verify_start(struct ccw_device *cdev); + /* * Process path verification data and report result. */ @@ -70,8 +72,8 @@ static void nop_do(struct ccw_device *cdev) struct subchannel *sch = to_subchannel(cdev->dev.parent); struct ccw_request *req = &cdev->private->req; - /* Adjust lpm. */ - req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & sch->opm); + req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & sch->opm & + ~cdev->private->path_noirq_mask); if (!req->lpm) goto out_nopath; nop_build_cp(cdev); @@ -102,10 +104,20 @@ static void nop_callback(struct ccw_device *cdev, void *data, int rc) struct subchannel *sch = to_subchannel(cdev->dev.parent); struct ccw_request *req = &cdev->private->req; - if (rc == 0) + switch (rc) { + case 0: sch->vpm |= req->lpm; - else if (rc != -EACCES) + break; + case -ETIME: + cdev->private->path_noirq_mask |= req->lpm; + break; + case -EACCES: + cdev->private->path_notoper_mask |= req->lpm; + break; + default: goto err; + } + /* Continue on the next path. */ req->lpm >>= 1; nop_do(cdev); return; @@ -132,6 +144,48 @@ static void spid_build_cp(struct ccw_device *cdev, u8 fn) req->cp = cp; } +static void pgid_wipeout_callback(struct ccw_device *cdev, void *data, int rc) +{ + if (rc) { + /* We don't know the path groups' state. Abort. */ + verify_done(cdev, rc); + return; + } + /* + * Path groups have been reset. Restart path verification but + * leave paths in path_noirq_mask out. + */ + cdev->private->flags.pgid_unknown = 0; + verify_start(cdev); +} + +/* + * Reset pathgroups and restart path verification, leave unusable paths out. + */ +static void pgid_wipeout_start(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_dev_id *id = &cdev->private->dev_id; + struct ccw_request *req = &cdev->private->req; + u8 fn; + + CIO_MSG_EVENT(2, "wipe: device 0.%x.%04x: pvm=%02x nim=%02x\n", + id->ssid, id->devno, cdev->private->pgid_valid_mask, + cdev->private->path_noirq_mask); + + /* Initialize request data. */ + memset(req, 0, sizeof(*req)); + req->timeout = PGID_TIMEOUT; + req->maxretries = PGID_RETRIES; + req->lpm = sch->schib.pmcw.pam; + req->callback = pgid_wipeout_callback; + fn = SPID_FUNC_DISBAND; + if (cdev->private->flags.mpath) + fn |= SPID_FUNC_MULTI_PATH; + spid_build_cp(cdev, fn); + ccw_request_start(cdev); +} + /* * Perform establish/resign SET PGID on a single path. */ @@ -157,11 +211,14 @@ static void spid_do(struct ccw_device *cdev) return; out_nopath: + if (cdev->private->flags.pgid_unknown) { + /* At least one SPID could be partially done. */ + pgid_wipeout_start(cdev); + return; + } verify_done(cdev, sch->vpm ? 0 : -EACCES); } -static void verify_start(struct ccw_device *cdev); - /* * Process SET PGID request result for a single path. */ @@ -174,7 +231,12 @@ static void spid_callback(struct ccw_device *cdev, void *data, int rc) case 0: sch->vpm |= req->lpm & sch->opm; break; + case -ETIME: + cdev->private->flags.pgid_unknown = 1; + cdev->private->path_noirq_mask |= req->lpm; + break; case -EACCES: + cdev->private->path_notoper_mask |= req->lpm; break; case -EOPNOTSUPP: if (cdev->private->flags.mpath) { @@ -330,8 +392,9 @@ static void snid_done(struct ccw_device *cdev, int rc) else { donepm = pgid_to_donepm(cdev); sch->vpm = donepm & sch->opm; - cdev->private->pgid_todo_mask &= ~donepm; cdev->private->pgid_reset_mask |= reset; + cdev->private->pgid_todo_mask &= + ~(donepm | cdev->private->path_noirq_mask); pgid_fill(cdev, pgid); } out: @@ -341,6 +404,10 @@ out: cdev->private->pgid_todo_mask, mismatch, reserved, reset); switch (rc) { case 0: + if (cdev->private->flags.pgid_unknown) { + pgid_wipeout_start(cdev); + return; + } /* Anything left to do? */ if (cdev->private->pgid_todo_mask == 0) { verify_done(cdev, sch->vpm == 0 ? -EACCES : 0); @@ -384,9 +451,10 @@ static void snid_do(struct ccw_device *cdev) { struct subchannel *sch = to_subchannel(cdev->dev.parent); struct ccw_request *req = &cdev->private->req; + int ret; - /* Adjust lpm if paths are not set in pam. */ - req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam); + req->lpm = lpm_adjust(req->lpm, sch->schib.pmcw.pam & + ~cdev->private->path_noirq_mask); if (!req->lpm) goto out_nopath; snid_build_cp(cdev); @@ -394,7 +462,13 @@ static void snid_do(struct ccw_device *cdev) return; out_nopath: - snid_done(cdev, cdev->private->pgid_valid_mask ? 0 : -EACCES); + if (cdev->private->pgid_valid_mask) + ret = 0; + else if (cdev->private->path_noirq_mask) + ret = -ETIME; + else + ret = -EACCES; + snid_done(cdev, ret); } /* @@ -404,10 +478,21 @@ static void snid_callback(struct ccw_device *cdev, void *data, int rc) { struct ccw_request *req = &cdev->private->req; - if (rc == 0) + switch (rc) { + case 0: cdev->private->pgid_valid_mask |= req->lpm; - else if (rc != -EACCES) + break; + case -ETIME: + cdev->private->flags.pgid_unknown = 1; + cdev->private->path_noirq_mask |= req->lpm; + break; + case -EACCES: + cdev->private->path_notoper_mask |= req->lpm; + break; + default: goto err; + } + /* Continue on the next path. */ req->lpm >>= 1; snid_do(cdev); return; @@ -427,6 +512,13 @@ static void verify_start(struct ccw_device *cdev) sch->vpm = 0; sch->lpm = sch->schib.pmcw.pam; + + /* Initialize PGID data. */ + memset(cdev->private->pgid, 0, sizeof(cdev->private->pgid)); + cdev->private->pgid_valid_mask = 0; + cdev->private->pgid_todo_mask = sch->schib.pmcw.pam; + cdev->private->path_notoper_mask = 0; + /* Initialize request data. */ memset(req, 0, sizeof(*req)); req->timeout = PGID_TIMEOUT; @@ -459,14 +551,8 @@ static void verify_start(struct ccw_device *cdev) */ void ccw_device_verify_start(struct ccw_device *cdev) { - struct subchannel *sch = to_subchannel(cdev->dev.parent); - CIO_TRACE_EVENT(4, "vrfy"); 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->pgid_valid_mask = 0; - cdev->private->pgid_todo_mask = sch->schib.pmcw.pam; /* * Initialize pathgroup and multipath state with target values. * They may change in the course of path verification. @@ -474,6 +560,7 @@ void ccw_device_verify_start(struct ccw_device *cdev) cdev->private->flags.pgroup = cdev->private->options.pgroup; cdev->private->flags.mpath = cdev->private->options.mpath; cdev->private->flags.doverify = 0; + cdev->private->path_noirq_mask = 0; verify_start(cdev); } |