2 * drivers/s390/cio/device_id.c
4 * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
6 * Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
16 #include <asm/ccwdev.h>
17 #include <asm/delay.h>
19 #include <asm/lowcore.h>
22 #include "cio_debug.h"
28 * diag210 is used under VM to get information about a virtual device
31 diag210(struct diag210
* addr
)
34 * diag 210 needs its data below the 2GB border, so we
35 * use a static data area to be sure
37 static struct diag210 diag210_tmp
;
38 static DEFINE_SPINLOCK(diag210_lock
);
42 spin_lock_irqsave(&diag210_lock
, flags
);
54 : "=&d" (ccode
) : "a" (&diag210_tmp
) : "cc", "memory");
63 : "=&d" (ccode
) : "a" (&diag210_tmp
) : "cc", "memory");
67 spin_unlock_irqrestore(&diag210_lock
, flags
);
74 * devno - device number
75 * ps - pointer to sense ID data area
79 VM_virtual_device_info (__u16 devno
, struct senseid
*ps
)
82 int vrdcvcla
, vrdcvtyp
, cu_type
;
84 { 0x08, 0x01, 0x3480 },
85 { 0x08, 0x02, 0x3430 },
86 { 0x08, 0x10, 0x3420 },
87 { 0x08, 0x42, 0x3424 },
88 { 0x08, 0x44, 0x9348 },
89 { 0x08, 0x81, 0x3490 },
90 { 0x08, 0x82, 0x3422 },
91 { 0x10, 0x41, 0x1403 },
92 { 0x10, 0x42, 0x3211 },
93 { 0x10, 0x43, 0x3203 },
94 { 0x10, 0x45, 0x3800 },
95 { 0x10, 0x47, 0x3262 },
96 { 0x10, 0x48, 0x3820 },
97 { 0x10, 0x49, 0x3800 },
98 { 0x10, 0x4a, 0x4245 },
99 { 0x10, 0x4b, 0x4248 },
100 { 0x10, 0x4d, 0x3800 },
101 { 0x10, 0x4e, 0x3820 },
102 { 0x10, 0x4f, 0x3820 },
103 { 0x10, 0x82, 0x2540 },
104 { 0x10, 0x84, 0x3525 },
105 { 0x20, 0x81, 0x2501 },
106 { 0x20, 0x82, 0x2540 },
107 { 0x20, 0x84, 0x3505 },
108 { 0x40, 0x01, 0x3278 },
109 { 0x40, 0x04, 0x3277 },
110 { 0x40, 0x80, 0x2250 },
111 { 0x40, 0xc0, 0x5080 },
112 { 0x80, 0x00, 0x3215 },
114 struct diag210 diag_data
;
117 CIO_TRACE_EVENT (4, "VMvdinf");
119 diag_data
= (struct diag210
) {
121 .vrdclen
= sizeof (diag_data
),
124 ccode
= diag210 (&diag_data
);
127 /* Special case for bloody osa devices. */
128 if (diag_data
.vrdcvcla
== 0x02 &&
129 diag_data
.vrdcvtyp
== 0x20) {
130 ps
->cu_type
= 0x3088;
134 for (i
= 0; i
< ARRAY_SIZE(vm_devices
); i
++)
135 if (diag_data
.vrdcvcla
== vm_devices
[i
].vrdcvcla
&&
136 diag_data
.vrdcvtyp
== vm_devices
[i
].vrdcvtyp
) {
137 ps
->cu_type
= vm_devices
[i
].cu_type
;
140 CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
141 "vdev class : %02X, vdev type : %04X \n ... "
142 "rdev class : %02X, rdev type : %04X, "
143 "rdev model: %02X\n",
145 diag_data
.vrdcvcla
, diag_data
.vrdcvtyp
,
146 diag_data
.vrdcrccl
, diag_data
.vrdccrty
,
151 * Start Sense ID helper function.
152 * Try to obtain the 'control unit'/'device type' information
153 * associated with the subchannel.
156 __ccw_device_sense_id_start(struct ccw_device
*cdev
)
158 struct subchannel
*sch
;
162 sch
= to_subchannel(cdev
->dev
.parent
);
163 /* Setup sense channel program. */
164 ccw
= cdev
->private->iccws
;
165 if (sch
->schib
.pmcw
.pim
!= 0x80) {
166 /* more than one path installed. */
167 ccw
->cmd_code
= CCW_CMD_SUSPEND_RECONN
;
170 ccw
->flags
= CCW_FLAG_SLI
| CCW_FLAG_CC
;
173 ccw
->cmd_code
= CCW_CMD_SENSE_ID
;
174 ccw
->cda
= (__u32
) __pa (&cdev
->private->senseid
);
175 ccw
->count
= sizeof (struct senseid
);
176 ccw
->flags
= CCW_FLAG_SLI
;
178 /* Reset device status. */
179 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
181 /* Try on every path. */
183 while (cdev
->private->imask
!= 0) {
184 if ((sch
->opm
& cdev
->private->imask
) != 0 &&
185 cdev
->private->iretry
> 0) {
186 cdev
->private->iretry
--;
187 /* Reset internal retry indication. */
188 cdev
->private->flags
.intretry
= 0;
189 ret
= cio_start (sch
, cdev
->private->iccws
,
190 cdev
->private->imask
);
191 /* ret is 0, -EBUSY, -EACCES or -ENODEV */
195 cdev
->private->imask
>>= 1;
196 cdev
->private->iretry
= 5;
202 ccw_device_sense_id_start(struct ccw_device
*cdev
)
206 memset (&cdev
->private->senseid
, 0, sizeof (struct senseid
));
207 cdev
->private->senseid
.cu_type
= 0xFFFF;
208 cdev
->private->imask
= 0x80;
209 cdev
->private->iretry
= 5;
210 ret
= __ccw_device_sense_id_start(cdev
);
211 if (ret
&& ret
!= -EBUSY
)
212 ccw_device_sense_id_done(cdev
, ret
);
216 * Called from interrupt context to check if a valid answer
217 * to Sense ID was received.
220 ccw_device_check_sense_id(struct ccw_device
*cdev
)
222 struct subchannel
*sch
;
225 sch
= to_subchannel(cdev
->dev
.parent
);
226 irb
= &cdev
->private->irb
;
227 /* Did we get a proper answer ? */
228 if (cdev
->private->senseid
.cu_type
!= 0xFFFF &&
229 cdev
->private->senseid
.reserved
== 0xFF) {
230 if (irb
->scsw
.count
< sizeof (struct senseid
) - 8)
231 cdev
->private->flags
.esid
= 1;
232 return 0; /* Success */
234 /* Check the error cases. */
235 if (irb
->scsw
.fctl
& (SCSW_FCTL_HALT_FUNC
| SCSW_FCTL_CLEAR_FUNC
)) {
236 /* Retry Sense ID if requested. */
237 if (cdev
->private->flags
.intretry
) {
238 cdev
->private->flags
.intretry
= 0;
243 if (irb
->esw
.esw0
.erw
.cons
&& (irb
->ecw
[0] & SNS0_CMD_REJECT
)) {
245 * if the device doesn't support the SenseID
246 * command further retries wouldn't help ...
247 * NB: We don't check here for intervention required like we
248 * did before, because tape devices with no tape inserted
249 * may present this status *in conjunction with* the
250 * sense id information. So, for intervention required,
251 * we use the "whack it until it talks" strategy...
253 CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel "
254 "0.%x.%04x reports cmd reject\n",
255 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
259 if (irb
->esw
.esw0
.erw
.cons
) {
260 CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, "
261 "lpum %02X, cnt %02d, sns :"
262 " %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
263 cdev
->private->dev_id
.ssid
,
264 cdev
->private->dev_id
.devno
,
265 irb
->esw
.esw0
.sublog
.lpum
,
266 irb
->esw
.esw0
.erw
.scnt
,
267 irb
->ecw
[0], irb
->ecw
[1],
268 irb
->ecw
[2], irb
->ecw
[3],
269 irb
->ecw
[4], irb
->ecw
[5],
270 irb
->ecw
[6], irb
->ecw
[7]);
273 if (irb
->scsw
.cc
== 3) {
275 sch
->schib
.pmcw
.pim
& sch
->schib
.pmcw
.pam
) != 0)
276 CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x "
277 "on subchannel 0.%x.%04x is "
278 "'not operational'\n", sch
->orb
.lpm
,
279 cdev
->private->dev_id
.devno
,
280 sch
->schid
.ssid
, sch
->schid
.sch_no
);
283 /* Hmm, whatever happened, try again. */
284 CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
285 "subchannel 0.%x.%04x returns status %02X%02X\n",
286 cdev
->private->dev_id
.devno
, sch
->schid
.ssid
,
288 irb
->scsw
.dstat
, irb
->scsw
.cstat
);
293 * Got interrupt for Sense ID.
296 ccw_device_sense_id_irq(struct ccw_device
*cdev
, enum dev_event dev_event
)
298 struct subchannel
*sch
;
302 sch
= to_subchannel(cdev
->dev
.parent
);
303 irb
= (struct irb
*) __LC_IRB
;
304 /* Retry sense id, if needed. */
305 if (irb
->scsw
.stctl
==
306 (SCSW_STCTL_STATUS_PEND
| SCSW_STCTL_ALERT_STATUS
)) {
307 if ((irb
->scsw
.cc
== 1) || !irb
->scsw
.actl
) {
308 ret
= __ccw_device_sense_id_start(cdev
);
309 if (ret
&& ret
!= -EBUSY
)
310 ccw_device_sense_id_done(cdev
, ret
);
314 if (ccw_device_accumulate_and_sense(cdev
, irb
) != 0)
316 ret
= ccw_device_check_sense_id(cdev
);
317 memset(&cdev
->private->irb
, 0, sizeof(struct irb
));
319 /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
320 case 0: /* Sense id succeeded. */
321 case -ETIME
: /* Sense id stopped by timeout. */
322 ccw_device_sense_id_done(cdev
, ret
);
324 case -EACCES
: /* channel is not operational. */
325 sch
->lpm
&= ~cdev
->private->imask
;
326 cdev
->private->imask
>>= 1;
327 cdev
->private->iretry
= 5;
329 case -EAGAIN
: /* try again. */
330 ret
= __ccw_device_sense_id_start(cdev
);
331 if (ret
== 0 || ret
== -EBUSY
)
334 default: /* Sense ID failed. Try asking VM. */
336 VM_virtual_device_info (cdev
->private->dev_id
.devno
,
337 &cdev
->private->senseid
);
338 if (cdev
->private->senseid
.cu_type
!= 0xFFFF) {
339 /* Got the device information from VM. */
340 ccw_device_sense_id_done(cdev
, 0);
345 * If we can't couldn't identify the device type we
346 * consider the device "not operational".
348 ccw_device_sense_id_done(cdev
, -ENODEV
);
353 EXPORT_SYMBOL(diag210
);