From d7d12ef2befac4fed0dccaddff11338b654804df Mon Sep 17 00:00:00 2001 From: Peter Oberparleiter Date: Mon, 7 Dec 2009 12:51:32 +0100 Subject: [S390] cio: make steal lock procedure more robust An Unconditional Reserve + Release operation (steal lock) for a boxed device may fail when encountering special error cases (e.g. unit checks or path errors). Fix this by using the more robust ccw_request infrastructure for performing the steal lock CCW program. Signed-off-by: Peter Oberparleiter Signed-off-by: Martin Schwidefsky --- drivers/s390/cio/device_pgid.c | 52 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) (limited to 'drivers/s390/cio/device_pgid.c') diff --git a/drivers/s390/cio/device_pgid.c b/drivers/s390/cio/device_pgid.c index 4d54abd82b8c..5bcefeaff744 100644 --- a/drivers/s390/cio/device_pgid.c +++ b/drivers/s390/cio/device_pgid.c @@ -507,3 +507,55 @@ void ccw_device_disband_start(struct ccw_device *cdev) spid_build_cp(cdev, fn); ccw_request_start(cdev); } + +static void stlck_build_cp(struct ccw_device *cdev, void *buf1, void *buf2) +{ + struct ccw_request *req = &cdev->private->req; + struct ccw1 *cp = cdev->private->iccws; + + cp[0].cmd_code = CCW_CMD_STLCK; + cp[0].cda = (u32) (addr_t) buf1; + cp[0].count = 32; + cp[0].flags = CCW_FLAG_CC; + cp[1].cmd_code = CCW_CMD_RELEASE; + cp[1].cda = (u32) (addr_t) buf2; + cp[1].count = 32; + cp[1].flags = 0; + req->cp = cp; +} + +static void stlck_callback(struct ccw_device *cdev, void *data, int rc) +{ + ccw_device_stlck_done(cdev, data, rc); +} + +/** + * ccw_device_stlck_start - perform unconditional release + * @cdev: ccw device + * @data: data pointer to be passed to ccw_device_stlck_done + * @buf1: data pointer used in channel program + * @buf2: data pointer used in channel program + * + * Execute a channel program on @cdev to release an existing PGID reservation. + * When finished, call ccw_device_stlck_done with a return code specifying the + * result. + */ +void ccw_device_stlck_start(struct ccw_device *cdev, void *data, void *buf1, + void *buf2) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + + CIO_TRACE_EVENT(4, "stlck"); + CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); + /* Request setup. */ + memset(req, 0, sizeof(*req)); + req->timeout = PGID_TIMEOUT; + req->maxretries = PGID_RETRIES; + req->lpm = sch->schib.pmcw.pam & sch->opm; + req->data = data; + req->callback = stlck_callback; + stlck_build_cp(cdev, buf1, buf2); + ccw_request_start(cdev); +} + -- cgit v1.2.3