324 строки
8.5 KiB
C
324 строки
8.5 KiB
C
/*
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* drivers/s390/cio/device_id.c
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*
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* Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
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* IBM Corporation
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* Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Sense ID functions.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <asm/ccwdev.h>
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#include <asm/delay.h>
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#include <asm/cio.h>
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#include <asm/lowcore.h>
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#include <asm/diag.h>
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#include "cio.h"
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#include "cio_debug.h"
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#include "css.h"
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#include "device.h"
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#include "ioasm.h"
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#include "io_sch.h"
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/**
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* vm_vdev_to_cu_type - Convert vm virtual device into control unit type
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* for certain devices.
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* @class: virtual device class
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* @type: virtual device type
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*
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* Returns control unit type if a match was made or %0xffff otherwise.
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*/
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static int vm_vdev_to_cu_type(int class, int type)
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{
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static struct {
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int class, type, cu_type;
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} vm_devices[] = {
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{ 0x08, 0x01, 0x3480 },
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{ 0x08, 0x02, 0x3430 },
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{ 0x08, 0x10, 0x3420 },
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{ 0x08, 0x42, 0x3424 },
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{ 0x08, 0x44, 0x9348 },
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{ 0x08, 0x81, 0x3490 },
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{ 0x08, 0x82, 0x3422 },
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{ 0x10, 0x41, 0x1403 },
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{ 0x10, 0x42, 0x3211 },
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{ 0x10, 0x43, 0x3203 },
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{ 0x10, 0x45, 0x3800 },
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{ 0x10, 0x47, 0x3262 },
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{ 0x10, 0x48, 0x3820 },
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{ 0x10, 0x49, 0x3800 },
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{ 0x10, 0x4a, 0x4245 },
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{ 0x10, 0x4b, 0x4248 },
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{ 0x10, 0x4d, 0x3800 },
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{ 0x10, 0x4e, 0x3820 },
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{ 0x10, 0x4f, 0x3820 },
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{ 0x10, 0x82, 0x2540 },
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{ 0x10, 0x84, 0x3525 },
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{ 0x20, 0x81, 0x2501 },
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{ 0x20, 0x82, 0x2540 },
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{ 0x20, 0x84, 0x3505 },
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{ 0x40, 0x01, 0x3278 },
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{ 0x40, 0x04, 0x3277 },
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{ 0x40, 0x80, 0x2250 },
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{ 0x40, 0xc0, 0x5080 },
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{ 0x80, 0x00, 0x3215 },
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};
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int i;
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for (i = 0; i < ARRAY_SIZE(vm_devices); i++)
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if (class == vm_devices[i].class && type == vm_devices[i].type)
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return vm_devices[i].cu_type;
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return 0xffff;
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}
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/**
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* diag_get_dev_info - retrieve device information via DIAG X'210'
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* @devno: device number
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* @ps: pointer to sense ID data area
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*
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* Returns zero on success, non-zero otherwise.
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*/
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static int diag_get_dev_info(u16 devno, struct senseid *ps)
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{
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struct diag210 diag_data;
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int ccode;
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CIO_TRACE_EVENT (4, "VMvdinf");
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diag_data = (struct diag210) {
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.vrdcdvno = devno,
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.vrdclen = sizeof (diag_data),
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};
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ccode = diag210 (&diag_data);
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if ((ccode == 0) || (ccode == 2)) {
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ps->reserved = 0xff;
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/* Special case for osa devices. */
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if (diag_data.vrdcvcla == 0x02 && diag_data.vrdcvtyp == 0x20) {
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ps->cu_type = 0x3088;
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ps->cu_model = 0x60;
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return 0;
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}
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ps->cu_type = vm_vdev_to_cu_type(diag_data.vrdcvcla,
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diag_data.vrdcvtyp);
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if (ps->cu_type != 0xffff)
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return 0;
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}
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CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
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"vdev class : %02X, vdev type : %04X \n ... "
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"rdev class : %02X, rdev type : %04X, "
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"rdev model: %02X\n",
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devno, ccode,
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diag_data.vrdcvcla, diag_data.vrdcvtyp,
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diag_data.vrdcrccl, diag_data.vrdccrty,
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diag_data.vrdccrmd);
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return -ENODEV;
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}
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/*
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* Start Sense ID helper function.
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* Try to obtain the 'control unit'/'device type' information
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* associated with the subchannel.
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*/
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static int
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__ccw_device_sense_id_start(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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struct ccw1 *ccw;
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int ret;
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sch = to_subchannel(cdev->dev.parent);
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/* Setup sense channel program. */
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ccw = cdev->private->iccws;
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ccw->cmd_code = CCW_CMD_SENSE_ID;
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ccw->cda = (__u32) __pa (&cdev->private->senseid);
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ccw->count = sizeof (struct senseid);
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ccw->flags = CCW_FLAG_SLI;
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/* Reset device status. */
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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/* Try on every path. */
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ret = -ENODEV;
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while (cdev->private->imask != 0) {
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cdev->private->senseid.cu_type = 0xFFFF;
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if ((sch->opm & cdev->private->imask) != 0 &&
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cdev->private->iretry > 0) {
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cdev->private->iretry--;
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/* Reset internal retry indication. */
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cdev->private->flags.intretry = 0;
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ret = cio_start (sch, cdev->private->iccws,
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cdev->private->imask);
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/* ret is 0, -EBUSY, -EACCES or -ENODEV */
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if (ret != -EACCES)
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return ret;
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}
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cdev->private->imask >>= 1;
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cdev->private->iretry = 5;
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}
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return ret;
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}
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void
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ccw_device_sense_id_start(struct ccw_device *cdev)
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{
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int ret;
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memset (&cdev->private->senseid, 0, sizeof (struct senseid));
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cdev->private->imask = 0x80;
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cdev->private->iretry = 5;
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ret = __ccw_device_sense_id_start(cdev);
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if (ret && ret != -EBUSY)
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ccw_device_sense_id_done(cdev, ret);
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}
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/*
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* Called from interrupt context to check if a valid answer
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* to Sense ID was received.
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*/
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static int
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ccw_device_check_sense_id(struct ccw_device *cdev)
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{
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struct subchannel *sch;
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struct irb *irb;
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sch = to_subchannel(cdev->dev.parent);
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irb = &cdev->private->irb;
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/* Check the error cases. */
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if (irb->scsw.cmd.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
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/* Retry Sense ID if requested. */
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if (cdev->private->flags.intretry) {
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cdev->private->flags.intretry = 0;
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return -EAGAIN;
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}
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return -ETIME;
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}
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if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) {
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/*
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* if the device doesn't support the SenseID
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* command further retries wouldn't help ...
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* NB: We don't check here for intervention required like we
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* did before, because tape devices with no tape inserted
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* may present this status *in conjunction with* the
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* sense id information. So, for intervention required,
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* we use the "whack it until it talks" strategy...
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*/
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CIO_MSG_EVENT(0, "SenseID : device %04x on Subchannel "
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"0.%x.%04x reports cmd reject\n",
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cdev->private->dev_id.devno, sch->schid.ssid,
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sch->schid.sch_no);
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return -EOPNOTSUPP;
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}
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if (irb->esw.esw0.erw.cons) {
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CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, "
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"lpum %02X, cnt %02d, sns :"
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" %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
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cdev->private->dev_id.ssid,
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cdev->private->dev_id.devno,
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irb->esw.esw0.sublog.lpum,
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irb->esw.esw0.erw.scnt,
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irb->ecw[0], irb->ecw[1],
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irb->ecw[2], irb->ecw[3],
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irb->ecw[4], irb->ecw[5],
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irb->ecw[6], irb->ecw[7]);
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return -EAGAIN;
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}
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if (irb->scsw.cmd.cc == 3) {
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u8 lpm;
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lpm = to_io_private(sch)->orb.cmd.lpm;
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if ((lpm & sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
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CIO_MSG_EVENT(4, "SenseID : path %02X for device %04x "
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"on subchannel 0.%x.%04x is "
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"'not operational'\n", lpm,
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cdev->private->dev_id.devno,
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sch->schid.ssid, sch->schid.sch_no);
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return -EACCES;
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}
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/* Did we get a proper answer ? */
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if (irb->scsw.cmd.cc == 0 && cdev->private->senseid.cu_type != 0xFFFF &&
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cdev->private->senseid.reserved == 0xFF) {
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if (irb->scsw.cmd.count < sizeof(struct senseid) - 8)
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cdev->private->flags.esid = 1;
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return 0; /* Success */
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}
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/* Hmm, whatever happened, try again. */
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CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
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"subchannel 0.%x.%04x returns status %02X%02X\n",
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cdev->private->dev_id.devno, sch->schid.ssid,
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sch->schid.sch_no,
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irb->scsw.cmd.dstat, irb->scsw.cmd.cstat);
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return -EAGAIN;
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}
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/*
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* Got interrupt for Sense ID.
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*/
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void
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ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
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{
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struct subchannel *sch;
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struct irb *irb;
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int ret;
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sch = to_subchannel(cdev->dev.parent);
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irb = (struct irb *) __LC_IRB;
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/* Retry sense id, if needed. */
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if (irb->scsw.cmd.stctl ==
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(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
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if ((irb->scsw.cmd.cc == 1) || !irb->scsw.cmd.actl) {
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ret = __ccw_device_sense_id_start(cdev);
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if (ret && ret != -EBUSY)
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ccw_device_sense_id_done(cdev, ret);
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}
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return;
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}
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if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
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return;
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ret = ccw_device_check_sense_id(cdev);
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memset(&cdev->private->irb, 0, sizeof(struct irb));
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switch (ret) {
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/* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
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case 0: /* Sense id succeeded. */
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case -ETIME: /* Sense id stopped by timeout. */
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ccw_device_sense_id_done(cdev, ret);
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break;
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case -EACCES: /* channel is not operational. */
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sch->lpm &= ~cdev->private->imask;
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cdev->private->imask >>= 1;
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cdev->private->iretry = 5;
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/* fall through. */
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case -EAGAIN: /* try again. */
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ret = __ccw_device_sense_id_start(cdev);
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if (ret == 0 || ret == -EBUSY)
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break;
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/* fall through. */
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default: /* Sense ID failed. Try asking VM. */
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if (MACHINE_IS_VM)
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ret = diag_get_dev_info(cdev->private->dev_id.devno,
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&cdev->private->senseid);
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else
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/*
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* If we can't couldn't identify the device type we
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* consider the device "not operational".
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*/
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ret = -ENODEV;
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ccw_device_sense_id_done(cdev, ret);
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break;
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}
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}
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