1/* 2 * CCW device SENSE ID I/O handling. 3 * 4 * Copyright IBM Corp. 2002,2009 5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 6 * Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Peter Oberparleiter <peter.oberparleiter@de.ibm.com> 8 */ 9 10#include <linux/kernel.h> 11#include <linux/string.h> 12#include <linux/types.h> 13#include <linux/errno.h> 14#include <asm/ccwdev.h> 15#include <asm/setup.h> 16#include <asm/cio.h> 17#include <asm/diag.h> 18 19#include "cio.h" 20#include "cio_debug.h" 21#include "device.h" 22#include "io_sch.h" 23 24#define SENSE_ID_RETRIES 256 25#define SENSE_ID_TIMEOUT (10 * HZ) 26#define SENSE_ID_MIN_LEN 4 27#define SENSE_ID_BASIC_LEN 7 28 29/** 30 * diag210_to_senseid - convert diag 0x210 data to sense id information 31 * @senseid: sense id 32 * @diag: diag 0x210 data 33 * 34 * Return 0 on success, non-zero otherwise. 35 */ 36static int diag210_to_senseid(struct senseid *senseid, struct diag210 *diag) 37{ 38 static struct { 39 int class, type, cu_type; 40 } vm_devices[] = { 41 { 0x08, 0x01, 0x3480 }, 42 { 0x08, 0x02, 0x3430 }, 43 { 0x08, 0x10, 0x3420 }, 44 { 0x08, 0x42, 0x3424 }, 45 { 0x08, 0x44, 0x9348 }, 46 { 0x08, 0x81, 0x3490 }, 47 { 0x08, 0x82, 0x3422 }, 48 { 0x10, 0x41, 0x1403 }, 49 { 0x10, 0x42, 0x3211 }, 50 { 0x10, 0x43, 0x3203 }, 51 { 0x10, 0x45, 0x3800 }, 52 { 0x10, 0x47, 0x3262 }, 53 { 0x10, 0x48, 0x3820 }, 54 { 0x10, 0x49, 0x3800 }, 55 { 0x10, 0x4a, 0x4245 }, 56 { 0x10, 0x4b, 0x4248 }, 57 { 0x10, 0x4d, 0x3800 }, 58 { 0x10, 0x4e, 0x3820 }, 59 { 0x10, 0x4f, 0x3820 }, 60 { 0x10, 0x82, 0x2540 }, 61 { 0x10, 0x84, 0x3525 }, 62 { 0x20, 0x81, 0x2501 }, 63 { 0x20, 0x82, 0x2540 }, 64 { 0x20, 0x84, 0x3505 }, 65 { 0x40, 0x01, 0x3278 }, 66 { 0x40, 0x04, 0x3277 }, 67 { 0x40, 0x80, 0x2250 }, 68 { 0x40, 0xc0, 0x5080 }, 69 { 0x80, 0x00, 0x3215 }, 70 }; 71 int i; 72 73 /* Special case for osa devices. */ 74 if (diag->vrdcvcla == 0x02 && diag->vrdcvtyp == 0x20) { 75 senseid->cu_type = 0x3088; 76 senseid->cu_model = 0x60; 77 senseid->reserved = 0xff; 78 return 0; 79 } 80 for (i = 0; i < ARRAY_SIZE(vm_devices); i++) { 81 if (diag->vrdcvcla == vm_devices[i].class && 82 diag->vrdcvtyp == vm_devices[i].type) { 83 senseid->cu_type = vm_devices[i].cu_type; 84 senseid->reserved = 0xff; 85 return 0; 86 } 87 } 88 89 return -ENODEV; 90} 91 92/** 93 * diag_get_dev_info - retrieve device information via diag 0x210 94 * @cdev: ccw device 95 * 96 * Returns zero on success, non-zero otherwise. 97 */ 98static int diag210_get_dev_info(struct ccw_device *cdev) 99{ 100 struct ccw_dev_id *dev_id = &cdev->private->dev_id; 101 struct senseid *senseid = &cdev->private->senseid; 102 struct diag210 diag_data; 103 int rc; 104 105 if (dev_id->ssid != 0) 106 return -ENODEV; 107 memset(&diag_data, 0, sizeof(diag_data)); 108 diag_data.vrdcdvno = dev_id->devno; 109 diag_data.vrdclen = sizeof(diag_data); 110 rc = diag210(&diag_data); 111 CIO_TRACE_EVENT(4, "diag210"); 112 CIO_HEX_EVENT(4, &rc, sizeof(rc)); 113 CIO_HEX_EVENT(4, &diag_data, sizeof(diag_data)); 114 if (rc != 0 && rc != 2) 115 goto err_failed; 116 if (diag210_to_senseid(senseid, &diag_data)) 117 goto err_unknown; 118 return 0; 119 120err_unknown: 121 CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: unknown diag210 data\n", 122 dev_id->ssid, dev_id->devno); 123 return -ENODEV; 124err_failed: 125 CIO_MSG_EVENT(0, "snsid: device 0.%x.%04x: diag210 failed (rc=%d)\n", 126 dev_id->ssid, dev_id->devno, rc); 127 return -ENODEV; 128} 129 130/* 131 * Initialize SENSE ID data. 132 */ 133static void snsid_init(struct ccw_device *cdev) 134{ 135 cdev->private->flags.esid = 0; 136 memset(&cdev->private->senseid, 0, sizeof(cdev->private->senseid)); 137 cdev->private->senseid.cu_type = 0xffff; 138} 139 140/* 141 * Check for complete SENSE ID data. 142 */ 143static int snsid_check(struct ccw_device *cdev, void *data) 144{ 145 struct cmd_scsw *scsw = &cdev->private->irb.scsw.cmd; 146 int len = sizeof(struct senseid) - scsw->count; 147 148 /* Check for incomplete SENSE ID data. */ 149 if (len < SENSE_ID_MIN_LEN) 150 goto out_restart; 151 if (cdev->private->senseid.cu_type == 0xffff) 152 goto out_restart; 153 /* Check for incompatible SENSE ID data. */ 154 if (cdev->private->senseid.reserved != 0xff) 155 return -EOPNOTSUPP; 156 /* Check for extended-identification information. */ 157 if (len > SENSE_ID_BASIC_LEN) 158 cdev->private->flags.esid = 1; 159 return 0; 160 161out_restart: 162 snsid_init(cdev); 163 return -EAGAIN; 164} 165 166/* 167 * Process SENSE ID request result. 168 */ 169static void snsid_callback(struct ccw_device *cdev, void *data, int rc) 170{ 171 struct ccw_dev_id *id = &cdev->private->dev_id; 172 struct senseid *senseid = &cdev->private->senseid; 173 int vm = 0; 174 175 if (rc && MACHINE_IS_VM) { 176 /* Try diag 0x210 fallback on z/VM. */ 177 snsid_init(cdev); 178 if (diag210_get_dev_info(cdev) == 0) { 179 rc = 0; 180 vm = 1; 181 } 182 } 183 CIO_MSG_EVENT(2, "snsid: device 0.%x.%04x: rc=%d %04x/%02x " 184 "%04x/%02x%s\n", id->ssid, id->devno, rc, 185 senseid->cu_type, senseid->cu_model, senseid->dev_type, 186 senseid->dev_model, vm ? " (diag210)" : ""); 187 ccw_device_sense_id_done(cdev, rc); 188} 189 190/** 191 * ccw_device_sense_id_start - perform SENSE ID 192 * @cdev: ccw device 193 * 194 * Execute a SENSE ID channel program on @cdev to update its sense id 195 * information. When finished, call ccw_device_sense_id_done with a 196 * return code specifying the result. 197 */ 198void ccw_device_sense_id_start(struct ccw_device *cdev) 199{ 200 struct subchannel *sch = to_subchannel(cdev->dev.parent); 201 struct ccw_request *req = &cdev->private->req; 202 struct ccw1 *cp = cdev->private->iccws; 203 204 CIO_TRACE_EVENT(4, "snsid"); 205 CIO_HEX_EVENT(4, &cdev->private->dev_id, sizeof(cdev->private->dev_id)); 206 /* Data setup. */ 207 snsid_init(cdev); 208 /* Channel program setup. */ 209 cp->cmd_code = CCW_CMD_SENSE_ID; 210 cp->cda = (u32) (addr_t) &cdev->private->senseid; 211 cp->count = sizeof(struct senseid); 212 cp->flags = CCW_FLAG_SLI; 213 /* Request setup. */ 214 memset(req, 0, sizeof(*req)); 215 req->cp = cp; 216 req->timeout = SENSE_ID_TIMEOUT; 217 req->maxretries = SENSE_ID_RETRIES; 218 req->lpm = sch->schib.pmcw.pam & sch->opm; 219 req->check = snsid_check; 220 req->callback = snsid_callback; 221 ccw_request_start(cdev); 222} 223