drivers/s390/cio/device_id.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  CCW device SENSE ID I/O handling.
   4  *
   5  *    Copyright IBM Corp. 2002, 2009
   6  *    Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   7  *               Martin Schwidefsky <schwidefsky@de.ibm.com>
   8  *               Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/string.h>
  13 #include <linux/types.h>
  14 #include <linux/errno.h>
  15 #include <asm/machine.h>
  16 #include <asm/ccwdev.h>
  17 #include <asm/setup.h>
  18 #include <asm/cio.h>
  19 #include <asm/diag.h>
  20
  21 #include "cio.h"
  22 #include "cio_debug.h"
  23 #include "device.h"
  24 #include "io_sch.h"
  25
  26 #define SENSE_ID_RETRIES        256
  27 #define SENSE_ID_TIMEOUT        (10 * HZ)
  28 #define SENSE_ID_MIN_LEN        4
  29 #define SENSE_ID_BASIC_LEN      7
  30
  31 /**
  32  * diag210_to_senseid - convert diag 0x210 data to sense id information
  33  * @senseid: sense id
  34  * @diag: diag 0x210 data
  35  *
  36  * Return 0 on success, non-zero otherwise.
  37  */
  38 static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag)
  39 {
  40         static struct {
  41                 int class, type, cu_type;
  42         } vm_devices[] = {
  43                 { 0x08, 0x01, 0x3480 },
  44                 { 0x08, 0x02, 0x3430 },
  45                 { 0x08, 0x10, 0x3420 },
  46                 { 0x08, 0x42, 0x3424 },
  47                 { 0x08, 0x44, 0x9348 },
  48                 { 0x08, 0x81, 0x3490 },
  49                 { 0x08, 0x82, 0x3422 },
  50                 { 0x10, 0x41, 0x1403 },
  51                 { 0x10, 0x42, 0x3211 },
  52                 { 0x10, 0x43, 0x3203 },
  53                 { 0x10, 0x45, 0x3800 },
  54                 { 0x10, 0x47, 0x3262 },
  55                 { 0x10, 0x48, 0x3820 },
  56                 { 0x10, 0x49, 0x3800 },
  57                 { 0x10, 0x4a, 0x4245 },
  58                 { 0x10, 0x4b, 0x4248 },
  59                 { 0x10, 0x4d, 0x3800 },
  60                 { 0x10, 0x4e, 0x3820 },
  61                 { 0x10, 0x4f, 0x3820 },
  62                 { 0x10, 0x82, 0x2540 },
  63                 { 0x10, 0x84, 0x3525 },
  64                 { 0x20, 0x81, 0x2501 },
  65                 { 0x20, 0x82, 0x2540 },
  66                 { 0x20, 0x84, 0x3505 },
  67                 { 0x40, 0x01, 0x3278 },
  68                 { 0x40, 0x04, 0x3277 },
  69                 { 0x40, 0x80, 0x2250 },
  70                 { 0x40, 0xc0, 0x5080 },
  71                 { 0x80, 0x00, 0x3215 },
  72         };
  73         int i;
  74
  75         /* Special case for osa devices. */
  76         if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) {
  77                 senseid->cu_type = 0x3088;
  78                 senseid->cu_model = 0x60;
  79                 senseid->reserved = 0xff;
  80                 return 0;
  81         }
  82         for (i = 0; i < ARRAY_SIZE(vm_devices); i++) {
  83                 if (diag->vrdcvcla == vm_devices[i].class &&
  84                     diag->vrdcvtyp == vm_devices[i].type) {
  85                         senseid->cu_type = vm_devices[i].cu_type;
  86                         senseid->reserved = 0xff;
  87                         return 0;
  88                 }
  89         }
  90
  91         return -ENODEV;
  92 }
  93
  94 /**
  95  * diag210_get_dev_info - retrieve device information via diag 0x210
  96  * @cdev: ccw device
  97  *
  98  * Returns zero on success, non-zero otherwise.
  99  */
 100 static int diag210_get_dev_info(struct ccw_device *cdev)
 101 {
 102         struct ccw_dev_id *dev_id = &cdev->private->dev_id;
 103         struct senseid *senseid = &cdev->private->dma_area->senseid;
 104         struct diag210 diag_data;
 105         int rc;
 106
 107         if (dev_id->ssid != 0)
 108                 return -ENODEV;
 109         memset(&diag_data, 0, sizeof(diag_data));
 110         diag_data.vrdcdvno      = dev_id->devno;
 111         diag_data.vrdclen       = sizeof(diag_data);
 112         rc = diag210(&diag_data);
 113         CIO_TRACE_EVENT(4, "diag210");
 114         CIO_HEX_EVENT(4, &rc, sizeof(rc));
 115         CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data));
 116         if (rc != 0 && rc != 2)
 117                 goto err_failed;
 118         if (diag210_to_senseid(senseid, &diag_data))
 119                 goto err_unknown;
 120         return 0;
 121
 122 err_unknown:
 123         CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n",
 124                       dev_id->ssid, dev_id->devno);
 125         return -ENODEV;
 126 err_failed:
 127         CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n",
 128                       dev_id->ssid, dev_id->devno, rc);
 129         return -ENODEV;
 130 }
 131
 132 /*
 133  * Initialize SENSE ID data.
 134  */
 135 static void snsid_init(struct ccw_device *cdev)
 136 {
 137         cdev->private->flags.esid = 0;
 138
 139         memset(&cdev->private->dma_area->senseid, 0,
 140                sizeof(cdev->private->dma_area->senseid));
 141         cdev->private->dma_area->senseid.cu_type = 0xffff;
 142 }
 143
 144 /*
 145  * Check for complete SENSE ID data.
 146  */
 147 static int snsid_check(struct ccw_device *cdev, void *data)
 148 {
 149         struct cmd_scsw *scsw = &cdev->private->dma_area->irb.scsw.cmd;
 150         int len = sizeof(struct senseid) - scsw->count;
 151
 152         /* Check for incomplete SENSE ID data. */
 153         if (len < SENSE_ID_MIN_LEN)
 154                 goto out_restart;
 155         if (cdev->private->dma_area->senseid.cu_type == 0xffff)
 156                 goto out_restart;
 157         /* Check for incompatible SENSE ID data. */
 158         if (cdev->private->dma_area->senseid.reserved != 0xff)
 159                 return -EOPNOTSUPP;
 160         /* Check for extended-identification information. */
 161         if (len > SENSE_ID_BASIC_LEN)
 162                 cdev->private->flags.esid = 1;
 163         return 0;
 164
 165 out_restart:
 166         snsid_init(cdev);
 167         return -EAGAIN;
 168 }
 169
 170 /*
 171  * Process SENSE ID request result.
 172  */
 173 static void snsid_callback(struct ccw_device *cdev, void *data, int rc)
 174 {
 175         struct ccw_dev_id *id = &cdev->private->dev_id;
 176         struct senseid *senseid = &cdev->private->dma_area->senseid;
 177         int vm = 0;
 178
 179         if (rc && machine_is_vm()) {
 180                 /* Try diag 0x210 fallback on z/VM. */
 181                 snsid_init(cdev);
 182                 if (diag210_get_dev_info(cdev) == 0) {
 183                         rc = 0;
 184                         vm = 1;
 185                 }
 186         }
 187         CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x "
 188                       "%04x/%02x%s\n", id->ssid, id->devno, rc,
 189                       senseid->cu_type, senseid->cu_model, senseid->dev_type,
 190                       senseid->dev_model, vm ? " (diag210)" : "");
 191         ccw_device_sense_id_done(cdev, rc);
 192 }
 193
 194 /**
 195  * ccw_device_sense_id_start - perform SENSE ID
 196  * @cdev: ccw device
 197  *
 198  * Execute a SENSE ID channel program on @cdev to update its sense id
 199  * information. When finished, call ccw_device_sense_id_done with a
 200  * return code specifying the result.
 201  */
 202 void ccw_device_sense_id_start(struct ccw_device *cdev)
 203 {
 204         struct subchannel *sch = to_subchannel(cdev->dev.parent);
 205         struct ccw_request *req = &cdev->private->req;
 206         struct ccw1 *cp = cdev->private->dma_area->iccws;
 207
 208         CIO_TRACE_EVENT(4, "snsid");
 209         CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id));
 210         /* Data setup. */
 211         snsid_init(cdev);
 212         /* Channel program setup. */
 213         cp->cmd_code    = CCW_CMD_SENSE_ID;
 214         cp->cda         = virt_to_dma32(&cdev->private->dma_area->senseid);
 215         cp->count       = sizeof(struct senseid);
 216         cp->flags       = CCW_FLAG_SLI;
 217         /* Request setup. */
 218         memset(req, 0, sizeof(*req));
 219         req->cp         = cp;
 220         req->timeout    = SENSE_ID_TIMEOUT;
 221         req->maxretries = SENSE_ID_RETRIES;
 222         req->lpm        = sch->schib.pmcw.pam & sch->opm;
 223         req->check      = snsid_check;
 224         req->callback   = snsid_callback;
 225         ccw_request_start(cdev);
 226 }