diff options
author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2009-12-07 12:51:26 +0100 |
---|---|---|
committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2009-12-07 12:51:31 +0100 |
commit | 39f5360b3d68a8e96d280481d9c442e7c005c317 (patch) | |
tree | 47d22cf70fffc21959e0728c06279913a863c028 /drivers/s390/cio/device_id.c | |
parent | e1f0fbd655539b0093738f58d57db83a0ac2dd6c (diff) | |
download | linux-39f5360b3d68a8e96d280481d9c442e7c005c317.tar.bz2 |
[S390] cio: use ccw request infrastructure for sense id
Use the newly introduced ccw request infrastructure to implement
the sense id operation.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/device_id.c')
-rw-r--r-- | drivers/s390/cio/device_id.c | 375 |
1 files changed, 137 insertions, 238 deletions
diff --git a/drivers/s390/cio/device_id.c b/drivers/s390/cio/device_id.c index 1bdaa614e34f..4728644ed85c 100644 --- a/drivers/s390/cio/device_id.c +++ b/drivers/s390/cio/device_id.c @@ -1,40 +1,39 @@ /* - * drivers/s390/cio/device_id.c + * CCW device SENSE ID I/O handling. * - * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, - * IBM Corporation - * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com) - * Martin Schwidefsky (schwidefsky@de.ibm.com) - * - * Sense ID functions. + * Copyright IBM Corp. 2002,2009 + * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> + * Martin Schwidefsky <schwidefsky@de.ibm.com> + * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> */ -#include <linux/module.h> -#include <linux/init.h> #include <linux/kernel.h> - +#include <linux/string.h> +#include <linux/types.h> +#include <linux/errno.h> #include <asm/ccwdev.h> -#include <asm/delay.h> +#include <asm/setup.h> #include <asm/cio.h> -#include <asm/lowcore.h> #include <asm/diag.h> #include "cio.h" #include "cio_debug.h" -#include "css.h" #include "device.h" -#include "ioasm.h" #include "io_sch.h" +#define SENSE_ID_RETRIES 5 +#define SENSE_ID_TIMEOUT (10 * HZ) +#define SENSE_ID_MIN_LEN 4 +#define SENSE_ID_BASIC_LEN 7 + /** - * vm_vdev_to_cu_type - Convert vm virtual device into control unit type - * for certain devices. - * @class: virtual device class - * @type: virtual device type + * diag210_to_senseid - convert diag 0x210 data to sense id information + * @senseid: sense id + * @diag: diag 0x210 data * - * Returns control unit type if a match was made or %0xffff otherwise. + * Return 0 on success, non-zero otherwise. */ -static int vm_vdev_to_cu_type(int class, int type) +static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag) { static struct { int class, type, cu_type; @@ -71,253 +70,153 @@ static int vm_vdev_to_cu_type(int class, int type) }; int i; - for (i = 0; i < ARRAY_SIZE(vm_devices); i++) - if (class == vm_devices[i].class && type == vm_devices[i].type) - return vm_devices[i].cu_type; + /* Special case for osa devices. */ + if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) { + senseid->cu_type = 0x3088; + senseid->cu_model = 0x60; + senseid->reserved = 0xff; + return 0; + } + for (i = 0; i < ARRAY_SIZE(vm_devices); i++) { + if (diag->vrdcvcla == vm_devices[i].class && + diag->vrdcvtyp == vm_devices[i].type) { + senseid->cu_type = vm_devices[i].cu_type; + senseid->reserved = 0xff; + return 0; + } + } - return 0xffff; + return -ENODEV; } /** - * diag_get_dev_info - retrieve device information via DIAG X'210' - * @devno: device number - * @ps: pointer to sense ID data area + * diag_get_dev_info - retrieve device information via diag 0x210 + * @cdev: ccw device * * Returns zero on success, non-zero otherwise. */ -static int diag_get_dev_info(u16 devno, struct senseid *ps) +static int diag210_get_dev_info(struct ccw_device *cdev) { + struct ccw_dev_id *dev_id = &cdev->private->dev_id; + struct senseid *senseid = &cdev->private->senseid; struct diag210 diag_data; - int ccode; - - CIO_TRACE_EVENT (4, "VMvdinf"); - - diag_data = (struct diag210) { - .vrdcdvno = devno, - .vrdclen = sizeof (diag_data), - }; - - ccode = diag210 (&diag_data); - if ((ccode == 0) || (ccode == 2)) { - ps->reserved = 0xff; - - /* Special case for osa devices. */ - if (diag_data.vrdcvcla == 0x02 && diag_data.vrdcvtyp == 0x20) { - ps->cu_type = 0x3088; - ps->cu_model = 0x60; - return 0; - } - ps->cu_type = vm_vdev_to_cu_type(diag_data.vrdcvcla, - diag_data.vrdcvtyp); - if (ps->cu_type != 0xffff) - return 0; - } - - CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):" - "vdev class : %02X, vdev type : %04X \n ... " - "rdev class : %02X, rdev type : %04X, " - "rdev model: %02X\n", - devno, ccode, - diag_data.vrdcvcla, diag_data.vrdcvtyp, - diag_data.vrdcrccl, diag_data.vrdccrty, - diag_data.vrdccrmd); - + int rc; + + if (dev_id->ssid != 0) + return -ENODEV; + memset(&diag_data, 0, sizeof(diag_data)); + diag_data.vrdcdvno = dev_id->devno; + diag_data.vrdclen = sizeof(diag_data); + rc = diag210(&diag_data); + CIO_TRACE_EVENT(4, "diag210"); + CIO_HEX_EVENT(4, &rc, sizeof(rc)); + CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data)); + if (rc != 0 && rc != 2) + goto err_failed; + if (diag210_to_senseid(senseid, &diag_data)) + goto err_unknown; + return 0; + +err_unknown: + CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n", + dev_id->ssid, dev_id->devno); + return -ENODEV; +err_failed: + CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n", + dev_id->ssid, dev_id->devno, rc); return -ENODEV; } /* - * Start Sense ID helper function. - * Try to obtain the 'control unit'/'device type' information - * associated with the subchannel. + * Initialize SENSE ID data. */ -static int -__ccw_device_sense_id_start(struct ccw_device *cdev) -{ - struct subchannel *sch; - struct ccw1 *ccw; - int ret; - - sch = to_subchannel(cdev->dev.parent); - /* Setup sense channel program. */ - ccw = cdev->private->iccws; - ccw->cmd_code = CCW_CMD_SENSE_ID; - ccw->cda = (__u32) __pa (&cdev->private->senseid); - ccw->count = sizeof (struct senseid); - ccw->flags = CCW_FLAG_SLI; - - /* Reset device status. */ - memset(&cdev->private->irb, 0, sizeof(struct irb)); - - /* Try on every path. */ - ret = -ENODEV; - while (cdev->private->imask != 0) { - cdev->private->senseid.cu_type = 0xFFFF; - if ((sch->opm & cdev->private->imask) != 0 && - cdev->private->iretry > 0) { - cdev->private->iretry--; - /* Reset internal retry indication. */ - cdev->private->flags.intretry = 0; - ret = cio_start (sch, cdev->private->iccws, - cdev->private->imask); - /* ret is 0, -EBUSY, -EACCES or -ENODEV */ - if (ret != -EACCES) - return ret; - } - cdev->private->imask >>= 1; - cdev->private->iretry = 5; - } - return ret; -} - -void -ccw_device_sense_id_start(struct ccw_device *cdev) +static void snsid_init(struct ccw_device *cdev) { - int ret; - - memset (&cdev->private->senseid, 0, sizeof (struct senseid)); - cdev->private->imask = 0x80; - cdev->private->iretry = 5; - ret = __ccw_device_sense_id_start(cdev); - if (ret && ret != -EBUSY) - ccw_device_sense_id_done(cdev, ret); + cdev->private->flags.esid = 0; + memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid)); + cdev->private->senseid.cu_type = 0xffff; } /* - * Called from interrupt context to check if a valid answer - * to Sense ID was received. + * Check for complete SENSE ID data. */ -static int -ccw_device_check_sense_id(struct ccw_device *cdev) +static int snsid_check(struct ccw_device *cdev, void *data) { - struct subchannel *sch; - struct irb *irb; - - sch = to_subchannel(cdev->dev.parent); - irb = &cdev->private->irb; - - /* Check the error cases. */ - if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) { - /* Retry Sense ID if requested. */ - if (cdev->private->flags.intretry) { - cdev->private->flags.intretry = 0; - return -EAGAIN; - } - return -ETIME; - } - if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) { - /* - * if the device doesn't support the SenseID - * command further retries wouldn't help ... - * NB: We don't check here for intervention required like we - * did before, because tape devices with no tape inserted - * may present this status *in conjunction with* the - * sense id information. So, for intervention required, - * we use the "whack it until it talks" strategy... - */ - CIO_MSG_EVENT(0, "SenseID : device %04x on Subchannel " - "0.%x.%04x reports cmd reject\n", - cdev->private->dev_id.devno, sch->schid.ssid, - sch->schid.sch_no); + struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd; + int len = sizeof(struct senseid) - scsw->count; + + /* Check for incomplete SENSE ID data. */ + if (len < SENSE_ID_MIN_LEN) + goto out_restart; + if (cdev->private->senseid.cu_type == 0xffff) + goto out_restart; + /* Check for incompatible SENSE ID data. */ + if (cdev->private->senseid.reserved != 0xff) return -EOPNOTSUPP; - } - if (irb->esw.esw0.erw.cons) { - CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, " - "lpum %02X, cnt %02d, sns :" - " %02X%02X%02X%02X %02X%02X%02X%02X ...\n", - cdev->private->dev_id.ssid, - cdev->private->dev_id.devno, - irb->esw.esw0.sublog.lpum, - irb->esw.esw0.erw.scnt, - irb->ecw[0], irb->ecw[1], - irb->ecw[2], irb->ecw[3], - irb->ecw[4], irb->ecw[5], - irb->ecw[6], irb->ecw[7]); - return -EAGAIN; - } - if (irb->scsw.cmd.cc == 3) { - u8 lpm; + /* Check for extended-identification information. */ + if (len > SENSE_ID_BASIC_LEN) + cdev->private->flags.esid = 1; + return 0; - lpm = to_io_private(sch)->orb.cmd.lpm; - if ((lpm & sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0) - CIO_MSG_EVENT(4, "SenseID : path %02X for device %04x " - "on subchannel 0.%x.%04x is " - "'not operational'\n", lpm, - cdev->private->dev_id.devno, - sch->schid.ssid, sch->schid.sch_no); - return -EACCES; - } - - /* Did we get a proper answer ? */ - if (irb->scsw.cmd.cc == 0 && cdev->private->senseid.cu_type != 0xFFFF && - cdev->private->senseid.reserved == 0xFF) { - if (irb->scsw.cmd.count < sizeof(struct senseid) - 8) - cdev->private->flags.esid = 1; - return 0; /* Success */ - } - - /* Hmm, whatever happened, try again. */ - CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on " - "subchannel 0.%x.%04x returns status %02X%02X\n", - cdev->private->dev_id.devno, sch->schid.ssid, - sch->schid.sch_no, - irb->scsw.cmd.dstat, irb->scsw.cmd.cstat); +out_restart: + snsid_init(cdev); return -EAGAIN; } /* - * Got interrupt for Sense ID. + * Process SENSE ID request result. */ -void -ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event) +static void snsid_callback(struct ccw_device *cdev, void *data, int rc) { - struct subchannel *sch; - struct irb *irb; - int ret; - - sch = to_subchannel(cdev->dev.parent); - irb = (struct irb *) __LC_IRB; - /* Retry sense id, if needed. */ - if (irb->scsw.cmd.stctl == - (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) { - if ((irb->scsw.cmd.cc == 1) || !irb->scsw.cmd.actl) { - ret = __ccw_device_sense_id_start(cdev); - if (ret && ret != -EBUSY) - ccw_device_sense_id_done(cdev, ret); + struct ccw_dev_id *id = &cdev->private->dev_id; + struct senseid *senseid = &cdev->private->senseid; + int vm = 0; + + if (rc && MACHINE_IS_VM) { + /* Try diag 0x210 fallback on z/VM. */ + snsid_init(cdev); + if (diag210_get_dev_info(cdev) == 0) { + rc = 0; + vm = 1; } - return; } - if (ccw_device_accumulate_and_sense(cdev, irb) != 0) - return; - ret = ccw_device_check_sense_id(cdev); - memset(&cdev->private->irb, 0, sizeof(struct irb)); - switch (ret) { - /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */ - case 0: /* Sense id succeeded. */ - case -ETIME: /* Sense id stopped by timeout. */ - ccw_device_sense_id_done(cdev, ret); - break; - case -EACCES: /* channel is not operational. */ - sch->lpm &= ~cdev->private->imask; - cdev->private->imask >>= 1; - cdev->private->iretry = 5; - /* fall through. */ - case -EAGAIN: /* try again. */ - ret = __ccw_device_sense_id_start(cdev); - if (ret == 0 || ret == -EBUSY) - break; - /* fall through. */ - default: /* Sense ID failed. Try asking VM. */ - if (MACHINE_IS_VM) - ret = diag_get_dev_info(cdev->private->dev_id.devno, - &cdev->private->senseid); - else - /* - * If we can't couldn't identify the device type we - * consider the device "not operational". - */ - ret = -ENODEV; + CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x " + "%04x/%02x%s\n", id->ssid, id->devno, rc, + senseid->cu_type, senseid->cu_model, senseid->dev_type, + senseid->dev_model, vm ? " (diag210)" : ""); + ccw_device_sense_id_done(cdev, rc); +} - ccw_device_sense_id_done(cdev, ret); - break; - } +/** + * ccw_device_sense_id_start - perform SENSE ID + * @cdev: ccw device + * + * Execute a SENSE ID channel program on @cdev to update its sense id + * information. When finished, call ccw_device_sense_id_done with a + * return code specifying the result. + */ +void ccw_device_sense_id_start(struct ccw_device *cdev) +{ + struct subchannel *sch = to_subchannel(cdev->dev.parent); + struct ccw_request *req = &cdev->private->req; + struct ccw1 *cp = cdev->private->iccws; + + CIO_TRACE_EVENT(4, "snsid"); + CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); + /* Data setup. */ + snsid_init(cdev); + /* Channel program setup. */ + cp->cmd_code = CCW_CMD_SENSE_ID; + cp->cda = (u32) (addr_t) &cdev->private->senseid; + cp->count = sizeof(struct senseid); + cp->flags = CCW_FLAG_SLI; + /* Request setup. */ + memset(req, 0, sizeof(*req)); + req->cp = cp; + req->timeout = SENSE_ID_TIMEOUT; + req->maxretries = SENSE_ID_RETRIES; + req->lpm = sch->schib.pmcw.pam & sch->opm; + req->check = snsid_check; + req->callback = snsid_callback; + ccw_request_start(cdev); } |