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357 lines
9.1 KiB
357 lines
9.1 KiB
/*
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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/config.h>
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#include <linux/init.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 "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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/*
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* diag210 is used under VM to get information about a virtual device
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*/
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#ifdef CONFIG_64BIT
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int
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diag210(struct diag210 * addr)
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{
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/*
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* diag 210 needs its data below the 2GB border, so we
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* use a static data area to be sure
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*/
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static struct diag210 diag210_tmp;
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static DEFINE_SPINLOCK(diag210_lock);
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unsigned long flags;
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int ccode;
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spin_lock_irqsave(&diag210_lock, flags);
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diag210_tmp = *addr;
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asm volatile (
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" lhi %0,-1\n"
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" sam31\n"
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" diag %1,0,0x210\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1: sam64\n"
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".section __ex_table,\"a\"\n"
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" .align 8\n"
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" .quad 0b,1b\n"
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".previous"
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: "=&d" (ccode) : "a" (__pa(&diag210_tmp)) : "cc", "memory" );
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*addr = diag210_tmp;
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spin_unlock_irqrestore(&diag210_lock, flags);
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return ccode;
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}
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#else
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int
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diag210(struct diag210 * addr)
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{
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int ccode;
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asm volatile (
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" lhi %0,-1\n"
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" diag %1,0,0x210\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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"1:\n"
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".section __ex_table,\"a\"\n"
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" .align 4\n"
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" .long 0b,1b\n"
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".previous"
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: "=&d" (ccode) : "a" (__pa(addr)) : "cc", "memory" );
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return ccode;
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}
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#endif
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/*
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* Input :
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* devno - device number
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* ps - pointer to sense ID data area
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* Output : none
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*/
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static void
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VM_virtual_device_info (__u16 devno, struct senseid *ps)
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{
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static struct {
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int vrdcvcla, vrdcvtyp, 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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struct diag210 diag_data;
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int ccode, i;
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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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ps->reserved = 0xff;
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/* Special case for bloody osa devices. */
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if (diag_data.vrdcvcla == 0x02 &&
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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;
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}
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for (i = 0; i < sizeof(vm_devices) / sizeof(vm_devices[0]); i++)
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if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla &&
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diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) {
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ps->cu_type = vm_devices[i].cu_type;
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return;
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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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}
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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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if (sch->schib.pmcw.pim != 0x80) {
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/* more than one path installed. */
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ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
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ccw->cda = 0;
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ccw->count = 0;
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ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
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ccw++;
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}
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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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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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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->senseid.cu_type = 0xFFFF;
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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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/* Did we get a proper answer ? */
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if (cdev->private->senseid.cu_type != 0xFFFF &&
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cdev->private->senseid.reserved == 0xFF) {
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if (irb->scsw.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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/* Check the error cases. */
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if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC))
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return -ETIME;
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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(2, "SenseID : device %04x on Subchannel "
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"0.%x.%04x reports cmd reject\n",
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cdev->private->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->ssid, cdev->private->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.cc == 3) {
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if ((sch->orb.lpm &
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sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
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CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x "
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"on subchannel 0.%x.%04x is "
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"'not operational'\n", sch->orb.lpm,
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cdev->private->devno, sch->schid.ssid,
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sch->schid.sch_no);
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return -EACCES;
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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->devno, sch->schid.ssid, sch->schid.sch_no,
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irb->scsw.dstat, irb->scsw.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.stctl ==
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(SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
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if ((irb->scsw.cc == 1) || !irb->scsw.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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VM_virtual_device_info (cdev->private->devno,
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&cdev->private->senseid);
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if (cdev->private->senseid.cu_type != 0xFFFF) {
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/* Got the device information from VM. */
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ccw_device_sense_id_done(cdev, 0);
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return;
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}
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}
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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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ccw_device_sense_id_done(cdev, -ENODEV);
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break;
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}
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}
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EXPORT_SYMBOL(diag210);
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