Pull bugfix into test branch
[linux-2.6] / drivers / s390 / cio / device_id.c
1 /*
2  * drivers/s390/cio/device_id.c
3  *
4  *    Copyright (C) 2002 IBM Deutschland Entwicklung GmbH,
5  *                       IBM Corporation
6  *    Author(s): Cornelia Huck (cornelia.huck@de.ibm.com)
7  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
8  *
9  * Sense ID functions.
10  */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14
15 #include <asm/ccwdev.h>
16 #include <asm/delay.h>
17 #include <asm/cio.h>
18 #include <asm/lowcore.h>
19
20 #include "cio.h"
21 #include "cio_debug.h"
22 #include "css.h"
23 #include "device.h"
24 #include "ioasm.h"
25
26 /*
27  * diag210 is used under VM to get information about a virtual device
28  */
29 #ifdef CONFIG_64BIT
30 int
31 diag210(struct diag210 * addr)
32 {
33         /*
34          * diag 210 needs its data below the 2GB border, so we
35          * use a static data area to be sure
36          */
37         static struct diag210 diag210_tmp;
38         static DEFINE_SPINLOCK(diag210_lock);
39         unsigned long flags;
40         int ccode;
41
42         spin_lock_irqsave(&diag210_lock, flags);
43         diag210_tmp = *addr;
44
45         asm volatile(
46                 "       lhi     %0,-1\n"
47                 "       sam31\n"
48                 "       diag    %1,0,0x210\n"
49                 "0:     ipm     %0\n"
50                 "       srl     %0,28\n"
51                 "1:     sam64\n"
52                 EX_TABLE(0b,1b)
53                 : "=&d" (ccode) : "a" (__pa(&diag210_tmp)) : "cc", "memory");
54
55         *addr = diag210_tmp;
56         spin_unlock_irqrestore(&diag210_lock, flags);
57
58         return ccode;
59 }
60 #else
61 int
62 diag210(struct diag210 * addr)
63 {
64         int ccode;
65
66         asm volatile(
67                 "       lhi     %0,-1\n"
68                 "       diag    %1,0,0x210\n"
69                 "0:     ipm     %0\n"
70                 "       srl     %0,28\n"
71                 "1:\n"
72                 EX_TABLE(0b,1b)
73                 : "=&d" (ccode) : "a" (__pa(addr)) : "cc", "memory");
74
75         return ccode;
76 }
77 #endif
78
79 /*
80  * Input :
81  *   devno - device number
82  *   ps    - pointer to sense ID data area
83  * Output : none
84  */
85 static void
86 VM_virtual_device_info (__u16 devno, struct senseid *ps)
87 {
88         static struct {
89                 int vrdcvcla, vrdcvtyp, cu_type;
90         } vm_devices[] = {
91                 { 0x08, 0x01, 0x3480 },
92                 { 0x08, 0x02, 0x3430 },
93                 { 0x08, 0x10, 0x3420 },
94                 { 0x08, 0x42, 0x3424 },
95                 { 0x08, 0x44, 0x9348 },
96                 { 0x08, 0x81, 0x3490 },
97                 { 0x08, 0x82, 0x3422 },
98                 { 0x10, 0x41, 0x1403 },
99                 { 0x10, 0x42, 0x3211 },
100                 { 0x10, 0x43, 0x3203 },
101                 { 0x10, 0x45, 0x3800 },
102                 { 0x10, 0x47, 0x3262 },
103                 { 0x10, 0x48, 0x3820 },
104                 { 0x10, 0x49, 0x3800 },
105                 { 0x10, 0x4a, 0x4245 },
106                 { 0x10, 0x4b, 0x4248 },
107                 { 0x10, 0x4d, 0x3800 },
108                 { 0x10, 0x4e, 0x3820 },
109                 { 0x10, 0x4f, 0x3820 },
110                 { 0x10, 0x82, 0x2540 },
111                 { 0x10, 0x84, 0x3525 },
112                 { 0x20, 0x81, 0x2501 },
113                 { 0x20, 0x82, 0x2540 },
114                 { 0x20, 0x84, 0x3505 },
115                 { 0x40, 0x01, 0x3278 },
116                 { 0x40, 0x04, 0x3277 },
117                 { 0x40, 0x80, 0x2250 },
118                 { 0x40, 0xc0, 0x5080 },
119                 { 0x80, 0x00, 0x3215 },
120         };
121         struct diag210 diag_data;
122         int ccode, i;
123
124         CIO_TRACE_EVENT (4, "VMvdinf");
125
126         diag_data = (struct diag210) {
127                 .vrdcdvno = devno,
128                 .vrdclen = sizeof (diag_data),
129         };
130
131         ccode = diag210 (&diag_data);
132         ps->reserved = 0xff;
133
134         /* Special case for bloody osa devices. */
135         if (diag_data.vrdcvcla == 0x02 &&
136             diag_data.vrdcvtyp == 0x20) {
137                 ps->cu_type = 0x3088;
138                 ps->cu_model = 0x60;
139                 return;
140         }
141         for (i = 0; i < sizeof(vm_devices) / sizeof(vm_devices[0]); i++)
142                 if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla &&
143                     diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) {
144                         ps->cu_type = vm_devices[i].cu_type;
145                         return;
146                 }
147         CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
148                       "vdev class : %02X, vdev type : %04X \n ...  "
149                       "rdev class : %02X, rdev type : %04X, "
150                       "rdev model: %02X\n",
151                       devno, ccode,
152                       diag_data.vrdcvcla, diag_data.vrdcvtyp,
153                       diag_data.vrdcrccl, diag_data.vrdccrty,
154                       diag_data.vrdccrmd);
155 }
156
157 /*
158  * Start Sense ID helper function.
159  * Try to obtain the 'control unit'/'device type' information
160  *  associated with the subchannel.
161  */
162 static int
163 __ccw_device_sense_id_start(struct ccw_device *cdev)
164 {
165         struct subchannel *sch;
166         struct ccw1 *ccw;
167         int ret;
168
169         sch = to_subchannel(cdev->dev.parent);
170         /* Setup sense channel program. */
171         ccw = cdev->private->iccws;
172         if (sch->schib.pmcw.pim != 0x80) {
173                 /* more than one path installed. */
174                 ccw->cmd_code = CCW_CMD_SUSPEND_RECONN;
175                 ccw->cda = 0;
176                 ccw->count = 0;
177                 ccw->flags = CCW_FLAG_SLI | CCW_FLAG_CC;
178                 ccw++;
179         }
180         ccw->cmd_code = CCW_CMD_SENSE_ID;
181         ccw->cda = (__u32) __pa (&cdev->private->senseid);
182         ccw->count = sizeof (struct senseid);
183         ccw->flags = CCW_FLAG_SLI;
184
185         /* Reset device status. */
186         memset(&cdev->private->irb, 0, sizeof(struct irb));
187
188         /* Try on every path. */
189         ret = -ENODEV;
190         while (cdev->private->imask != 0) {
191                 if ((sch->opm & cdev->private->imask) != 0 &&
192                     cdev->private->iretry > 0) {
193                         cdev->private->iretry--;
194                         /* Reset internal retry indication. */
195                         cdev->private->flags.intretry = 0;
196                         ret = cio_start (sch, cdev->private->iccws,
197                                          cdev->private->imask);
198                         /* ret is 0, -EBUSY, -EACCES or -ENODEV */
199                         if (ret != -EACCES)
200                                 return ret;
201                 }
202                 cdev->private->imask >>= 1;
203                 cdev->private->iretry = 5;
204         }
205         return ret;
206 }
207
208 void
209 ccw_device_sense_id_start(struct ccw_device *cdev)
210 {
211         int ret;
212
213         memset (&cdev->private->senseid, 0, sizeof (struct senseid));
214         cdev->private->senseid.cu_type = 0xFFFF;
215         cdev->private->imask = 0x80;
216         cdev->private->iretry = 5;
217         ret = __ccw_device_sense_id_start(cdev);
218         if (ret && ret != -EBUSY)
219                 ccw_device_sense_id_done(cdev, ret);
220 }
221
222 /*
223  * Called from interrupt context to check if a valid answer
224  * to Sense ID was received.
225  */
226 static int
227 ccw_device_check_sense_id(struct ccw_device *cdev)
228 {
229         struct subchannel *sch;
230         struct irb *irb;
231
232         sch = to_subchannel(cdev->dev.parent);
233         irb = &cdev->private->irb;
234         /* Did we get a proper answer ? */
235         if (cdev->private->senseid.cu_type != 0xFFFF && 
236             cdev->private->senseid.reserved == 0xFF) {
237                 if (irb->scsw.count < sizeof (struct senseid) - 8)
238                         cdev->private->flags.esid = 1;
239                 return 0; /* Success */
240         }
241         /* Check the error cases. */
242         if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
243                 /* Retry Sense ID if requested. */
244                 if (cdev->private->flags.intretry) {
245                         cdev->private->flags.intretry = 0;
246                         return -EAGAIN;
247                 }
248                 return -ETIME;
249         }
250         if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) {
251                 /*
252                  * if the device doesn't support the SenseID
253                  *  command further retries wouldn't help ...
254                  * NB: We don't check here for intervention required like we
255                  *     did before, because tape devices with no tape inserted
256                  *     may present this status *in conjunction with* the
257                  *     sense id information. So, for intervention required,
258                  *     we use the "whack it until it talks" strategy...
259                  */
260                 CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel "
261                               "0.%x.%04x reports cmd reject\n",
262                               cdev->private->dev_id.devno, sch->schid.ssid,
263                               sch->schid.sch_no);
264                 return -EOPNOTSUPP;
265         }
266         if (irb->esw.esw0.erw.cons) {
267                 CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, "
268                               "lpum %02X, cnt %02d, sns :"
269                               " %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
270                               cdev->private->dev_id.ssid,
271                               cdev->private->dev_id.devno,
272                               irb->esw.esw0.sublog.lpum,
273                               irb->esw.esw0.erw.scnt,
274                               irb->ecw[0], irb->ecw[1],
275                               irb->ecw[2], irb->ecw[3],
276                               irb->ecw[4], irb->ecw[5],
277                               irb->ecw[6], irb->ecw[7]);
278                 return -EAGAIN;
279         }
280         if (irb->scsw.cc == 3) {
281                 if ((sch->orb.lpm &
282                      sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
283                         CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x "
284                                       "on subchannel 0.%x.%04x is "
285                                       "'not operational'\n", sch->orb.lpm,
286                                       cdev->private->dev_id.devno,
287                                       sch->schid.ssid, sch->schid.sch_no);
288                 return -EACCES;
289         }
290         /* Hmm, whatever happened, try again. */
291         CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
292                       "subchannel 0.%x.%04x returns status %02X%02X\n",
293                       cdev->private->dev_id.devno, sch->schid.ssid,
294                       sch->schid.sch_no,
295                       irb->scsw.dstat, irb->scsw.cstat);
296         return -EAGAIN;
297 }
298
299 /*
300  * Got interrupt for Sense ID.
301  */
302 void
303 ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
304 {
305         struct subchannel *sch;
306         struct irb *irb;
307         int ret;
308
309         sch = to_subchannel(cdev->dev.parent);
310         irb = (struct irb *) __LC_IRB;
311         /* Retry sense id, if needed. */
312         if (irb->scsw.stctl ==
313             (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
314                 if ((irb->scsw.cc == 1) || !irb->scsw.actl) {
315                         ret = __ccw_device_sense_id_start(cdev);
316                         if (ret && ret != -EBUSY)
317                                 ccw_device_sense_id_done(cdev, ret);
318                 }
319                 return;
320         }
321         if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
322                 return;
323         ret = ccw_device_check_sense_id(cdev);
324         memset(&cdev->private->irb, 0, sizeof(struct irb));
325         switch (ret) {
326         /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
327         case 0:                 /* Sense id succeeded. */
328         case -ETIME:            /* Sense id stopped by timeout. */
329                 ccw_device_sense_id_done(cdev, ret);
330                 break;
331         case -EACCES:           /* channel is not operational. */
332                 sch->lpm &= ~cdev->private->imask;
333                 cdev->private->imask >>= 1;
334                 cdev->private->iretry = 5;
335                 /* fall through. */
336         case -EAGAIN:           /* try again. */
337                 ret = __ccw_device_sense_id_start(cdev);
338                 if (ret == 0 || ret == -EBUSY)
339                         break;
340                 /* fall through. */
341         default:                /* Sense ID failed. Try asking VM. */
342                 if (MACHINE_IS_VM) {
343                         VM_virtual_device_info (cdev->private->dev_id.devno,
344                                                 &cdev->private->senseid);
345                         if (cdev->private->senseid.cu_type != 0xFFFF) {
346                                 /* Got the device information from VM. */
347                                 ccw_device_sense_id_done(cdev, 0);
348                                 return;
349                         }
350                 }
351                 /*
352                  * If we can't couldn't identify the device type we
353                  *  consider the device "not operational".
354                  */
355                 ccw_device_sense_id_done(cdev, -ENODEV);
356                 break;
357         }
358 }
359
360 EXPORT_SYMBOL(diag210);