![Peter Oberparleiter](/assets/img/avatar_default.png)
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>
223 lines
5.7 KiB
C
223 lines
5.7 KiB
C
/*
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* CCW device SENSE ID I/O handling.
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*
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* Copyright IBM Corp. 2002,2009
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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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* Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
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*/
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <asm/ccwdev.h>
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#include <asm/setup.h>
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#include <asm/cio.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 "device.h"
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#include "io_sch.h"
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#define SENSE_ID_RETRIES 5
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#define SENSE_ID_TIMEOUT (10 * HZ)
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#define SENSE_ID_MIN_LEN 4
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#define SENSE_ID_BASIC_LEN 7
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/**
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* diag210_to_senseid - convert diag 0x210 data to sense id information
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* @senseid: sense id
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* @diag: diag 0x210 data
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*
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* Return 0 on success, non-zero otherwise.
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*/
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static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
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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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/* Special case for osa devices. */
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if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
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senseid->cu_type = 0x3088;
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senseid->cu_model = 0x60;
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senseid->reserved = 0xff;
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return 0;
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}
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for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
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if (diag->vrdcvcla == vm_devices[i].class &&
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diag->vrdcvtyp == vm_devices[i].type) {
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senseid->cu_type = vm_devices[i].cu_type;
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senseid->reserved = 0xff;
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return 0;
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}
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}
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return -ENODEV;
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}
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/**
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* diag_get_dev_info - retrieve device information via diag 0x210
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* @cdev: ccw device
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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 diag210_get_dev_info(struct ccw_device *cdev)
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{
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struct ccw_dev_id *dev_id = &cdev->private->dev_id;
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struct senseid *senseid = &cdev->private->senseid;
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struct diag210 diag_data;
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int rc;
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if (dev_id->ssid != 0)
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return -ENODEV;
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memset(&diag_data, 0, sizeof(diag_data));
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diag_data.vrdcdvno = dev_id->devno;
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diag_data.vrdclen = sizeof(diag_data);
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rc = diag210(&diag_data);
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CIO_TRACE_EVENT(4, "diag210");
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CIO_HEX_EVENT(4, &rc, sizeof(rc));
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CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
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if (rc != 0 && rc != 2)
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goto err_failed;
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if (diag210_to_senseid(senseid, &diag_data))
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goto err_unknown;
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return 0;
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err_unknown:
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CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
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dev_id->ssid, dev_id->devno);
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return -ENODEV;
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err_failed:
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CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
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dev_id->ssid, dev_id->devno, rc);
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return -ENODEV;
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}
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/*
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* Initialize SENSE ID data.
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*/
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static void snsid_init(struct ccw_device *cdev)
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{
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cdev->private->flags.esid = 0;
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memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid));
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cdev->private->senseid.cu_type = 0xffff;
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}
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/*
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* Check for complete SENSE ID data.
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*/
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static int snsid_check(struct ccw_device *cdev, void *data)
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{
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struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd;
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int len = sizeof(struct senseid) - scsw->count;
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/* Check for incomplete SENSE ID data. */
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if (len < SENSE_ID_MIN_LEN)
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goto out_restart;
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if (cdev->private->senseid.cu_type == 0xffff)
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goto out_restart;
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/* Check for incompatible SENSE ID data. */
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if (cdev->private->senseid.reserved != 0xff)
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return -EOPNOTSUPP;
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/* Check for extended-identification information. */
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if (len > SENSE_ID_BASIC_LEN)
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cdev->private->flags.esid = 1;
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return 0;
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out_restart:
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snsid_init(cdev);
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return -EAGAIN;
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}
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/*
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* Process SENSE ID request result.
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*/
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static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
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{
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struct ccw_dev_id *id = &cdev->private->dev_id;
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struct senseid *senseid = &cdev->private->senseid;
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int vm = 0;
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if (rc && MACHINE_IS_VM) {
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/* Try diag 0x210 fallback on z/VM. */
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snsid_init(cdev);
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if (diag210_get_dev_info(cdev) == 0) {
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rc = 0;
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vm = 1;
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}
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}
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CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
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"%04x/%02x%s\n", id->ssid, id->devno, rc,
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senseid->cu_type, senseid->cu_model, senseid->dev_type,
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senseid->dev_model, vm ? " (diag210)" : "");
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ccw_device_sense_id_done(cdev, rc);
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}
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/**
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* ccw_device_sense_id_start - perform SENSE ID
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* @cdev: ccw device
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*
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* Execute a SENSE ID channel program on @cdev to update its sense id
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* information. When finished, call ccw_device_sense_id_done with a
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* return code specifying the result.
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*/
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void ccw_device_sense_id_start(struct ccw_device *cdev)
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{
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struct subchannel *sch = to_subchannel(cdev->dev.parent);
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struct ccw_request *req = &cdev->private->req;
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struct ccw1 *cp = cdev->private->iccws;
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CIO_TRACE_EVENT(4, "snsid");
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CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
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/* Data setup. */
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snsid_init(cdev);
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/* Channel program setup. */
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cp->cmd_code = CCW_CMD_SENSE_ID;
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cp->cda = (u32) (addr_t) &cdev->private->senseid;
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cp->count = sizeof(struct senseid);
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cp->flags = CCW_FLAG_SLI;
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/* Request setup. */
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memset(req, 0, sizeof(*req));
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req->cp = cp;
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req->timeout = SENSE_ID_TIMEOUT;
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req->maxretries = SENSE_ID_RETRIES;
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req->lpm = sch->schib.pmcw.pam & sch->opm;
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req->check = snsid_check;
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req->callback = snsid_callback;
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ccw_request_start(cdev);
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}
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