Pull thermal into release 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 #include <linux/kernel.h>
15
16 #include <asm/ccwdev.h>
17 #include <asm/delay.h>
18 #include <asm/cio.h>
19 #include <asm/lowcore.h>
20 #include <asm/diag.h>
21
22 #include "cio.h"
23 #include "cio_debug.h"
24 #include "css.h"
25 #include "device.h"
26 #include "ioasm.h"
27
28 /*
29  * Input :
30  *   devno - device number
31  *   ps    - pointer to sense ID data area
32  * Output : none
33  */
34 static void
35 VM_virtual_device_info (__u16 devno, struct senseid *ps)
36 {
37         static struct {
38                 int vrdcvcla, vrdcvtyp, cu_type;
39         } vm_devices[] = {
40                 { 0x08, 0x01, 0x3480 },
41                 { 0x08, 0x02, 0x3430 },
42                 { 0x08, 0x10, 0x3420 },
43                 { 0x08, 0x42, 0x3424 },
44                 { 0x08, 0x44, 0x9348 },
45                 { 0x08, 0x81, 0x3490 },
46                 { 0x08, 0x82, 0x3422 },
47                 { 0x10, 0x41, 0x1403 },
48                 { 0x10, 0x42, 0x3211 },
49                 { 0x10, 0x43, 0x3203 },
50                 { 0x10, 0x45, 0x3800 },
51                 { 0x10, 0x47, 0x3262 },
52                 { 0x10, 0x48, 0x3820 },
53                 { 0x10, 0x49, 0x3800 },
54                 { 0x10, 0x4a, 0x4245 },
55                 { 0x10, 0x4b, 0x4248 },
56                 { 0x10, 0x4d, 0x3800 },
57                 { 0x10, 0x4e, 0x3820 },
58                 { 0x10, 0x4f, 0x3820 },
59                 { 0x10, 0x82, 0x2540 },
60                 { 0x10, 0x84, 0x3525 },
61                 { 0x20, 0x81, 0x2501 },
62                 { 0x20, 0x82, 0x2540 },
63                 { 0x20, 0x84, 0x3505 },
64                 { 0x40, 0x01, 0x3278 },
65                 { 0x40, 0x04, 0x3277 },
66                 { 0x40, 0x80, 0x2250 },
67                 { 0x40, 0xc0, 0x5080 },
68                 { 0x80, 0x00, 0x3215 },
69         };
70         struct diag210 diag_data;
71         int ccode, i;
72
73         CIO_TRACE_EVENT (4, "VMvdinf");
74
75         diag_data = (struct diag210) {
76                 .vrdcdvno = devno,
77                 .vrdclen = sizeof (diag_data),
78         };
79
80         ccode = diag210 (&diag_data);
81         ps->reserved = 0xff;
82
83         /* Special case for bloody osa devices. */
84         if (diag_data.vrdcvcla == 0x02 &&
85             diag_data.vrdcvtyp == 0x20) {
86                 ps->cu_type = 0x3088;
87                 ps->cu_model = 0x60;
88                 return;
89         }
90         for (i = 0; i < ARRAY_SIZE(vm_devices); i++)
91                 if (diag_data.vrdcvcla == vm_devices[i].vrdcvcla &&
92                     diag_data.vrdcvtyp == vm_devices[i].vrdcvtyp) {
93                         ps->cu_type = vm_devices[i].cu_type;
94                         return;
95                 }
96         CIO_MSG_EVENT(0, "DIAG X'210' for device %04X returned (cc = %d):"
97                       "vdev class : %02X, vdev type : %04X \n ...  "
98                       "rdev class : %02X, rdev type : %04X, "
99                       "rdev model: %02X\n",
100                       devno, ccode,
101                       diag_data.vrdcvcla, diag_data.vrdcvtyp,
102                       diag_data.vrdcrccl, diag_data.vrdccrty,
103                       diag_data.vrdccrmd);
104 }
105
106 /*
107  * Start Sense ID helper function.
108  * Try to obtain the 'control unit'/'device type' information
109  *  associated with the subchannel.
110  */
111 static int
112 __ccw_device_sense_id_start(struct ccw_device *cdev)
113 {
114         struct subchannel *sch;
115         struct ccw1 *ccw;
116
117         sch = to_subchannel(cdev->dev.parent);
118         /* Setup sense channel program. */
119         ccw = cdev->private->iccws;
120         ccw->cmd_code = CCW_CMD_SENSE_ID;
121         ccw->cda = (__u32) __pa (&cdev->private->senseid);
122         ccw->count = sizeof (struct senseid);
123         ccw->flags = CCW_FLAG_SLI;
124
125         /* Reset device status. */
126         memset(&cdev->private->irb, 0, sizeof(struct irb));
127         cdev->private->flags.intretry = 0;
128
129         return cio_start(sch, ccw, LPM_ANYPATH);
130 }
131
132 void
133 ccw_device_sense_id_start(struct ccw_device *cdev)
134 {
135         int ret;
136
137         memset (&cdev->private->senseid, 0, sizeof (struct senseid));
138         cdev->private->senseid.cu_type = 0xFFFF;
139         cdev->private->iretry = 3;
140         ret = __ccw_device_sense_id_start(cdev);
141         if (ret && ret != -EBUSY)
142                 ccw_device_sense_id_done(cdev, ret);
143 }
144
145 /*
146  * Called from interrupt context to check if a valid answer
147  * to Sense ID was received.
148  */
149 static int
150 ccw_device_check_sense_id(struct ccw_device *cdev)
151 {
152         struct subchannel *sch;
153         struct irb *irb;
154
155         sch = to_subchannel(cdev->dev.parent);
156         irb = &cdev->private->irb;
157         /* Did we get a proper answer ? */
158         if (cdev->private->senseid.cu_type != 0xFFFF && 
159             cdev->private->senseid.reserved == 0xFF) {
160                 if (irb->scsw.count < sizeof (struct senseid) - 8)
161                         cdev->private->flags.esid = 1;
162                 return 0; /* Success */
163         }
164         /* Check the error cases. */
165         if (irb->scsw.fctl & (SCSW_FCTL_HALT_FUNC | SCSW_FCTL_CLEAR_FUNC)) {
166                 /* Retry Sense ID if requested. */
167                 if (cdev->private->flags.intretry) {
168                         cdev->private->flags.intretry = 0;
169                         return -EAGAIN;
170                 }
171                 return -ETIME;
172         }
173         if (irb->esw.esw0.erw.cons && (irb->ecw[0] & SNS0_CMD_REJECT)) {
174                 /*
175                  * if the device doesn't support the SenseID
176                  *  command further retries wouldn't help ...
177                  * NB: We don't check here for intervention required like we
178                  *     did before, because tape devices with no tape inserted
179                  *     may present this status *in conjunction with* the
180                  *     sense id information. So, for intervention required,
181                  *     we use the "whack it until it talks" strategy...
182                  */
183                 CIO_MSG_EVENT(2, "SenseID : device %04x on Subchannel "
184                               "0.%x.%04x reports cmd reject\n",
185                               cdev->private->dev_id.devno, sch->schid.ssid,
186                               sch->schid.sch_no);
187                 return -EOPNOTSUPP;
188         }
189         if (irb->esw.esw0.erw.cons) {
190                 CIO_MSG_EVENT(2, "SenseID : UC on dev 0.%x.%04x, "
191                               "lpum %02X, cnt %02d, sns :"
192                               " %02X%02X%02X%02X %02X%02X%02X%02X ...\n",
193                               cdev->private->dev_id.ssid,
194                               cdev->private->dev_id.devno,
195                               irb->esw.esw0.sublog.lpum,
196                               irb->esw.esw0.erw.scnt,
197                               irb->ecw[0], irb->ecw[1],
198                               irb->ecw[2], irb->ecw[3],
199                               irb->ecw[4], irb->ecw[5],
200                               irb->ecw[6], irb->ecw[7]);
201                 return -EAGAIN;
202         }
203         if (irb->scsw.cc == 3) {
204                 if ((sch->orb.lpm &
205                      sch->schib.pmcw.pim & sch->schib.pmcw.pam) != 0)
206                         CIO_MSG_EVENT(2, "SenseID : path %02X for device %04x "
207                                       "on subchannel 0.%x.%04x is "
208                                       "'not operational'\n", sch->orb.lpm,
209                                       cdev->private->dev_id.devno,
210                                       sch->schid.ssid, sch->schid.sch_no);
211                 return -EACCES;
212         }
213         /* Hmm, whatever happened, try again. */
214         CIO_MSG_EVENT(2, "SenseID : start_IO() for device %04x on "
215                       "subchannel 0.%x.%04x returns status %02X%02X\n",
216                       cdev->private->dev_id.devno, sch->schid.ssid,
217                       sch->schid.sch_no,
218                       irb->scsw.dstat, irb->scsw.cstat);
219         return -EAGAIN;
220 }
221
222 /*
223  * Got interrupt for Sense ID.
224  */
225 void
226 ccw_device_sense_id_irq(struct ccw_device *cdev, enum dev_event dev_event)
227 {
228         struct subchannel *sch;
229         struct irb *irb;
230         int ret;
231
232         sch = to_subchannel(cdev->dev.parent);
233         irb = (struct irb *) __LC_IRB;
234         /* Retry sense id, if needed. */
235         if (irb->scsw.stctl ==
236             (SCSW_STCTL_STATUS_PEND | SCSW_STCTL_ALERT_STATUS)) {
237                 if ((irb->scsw.cc == 1) || !irb->scsw.actl) {
238                         ret = __ccw_device_sense_id_start(cdev);
239                         if (ret && ret != -EBUSY)
240                                 ccw_device_sense_id_done(cdev, ret);
241                 }
242                 return;
243         }
244         if (ccw_device_accumulate_and_sense(cdev, irb) != 0)
245                 return;
246         ret = ccw_device_check_sense_id(cdev);
247         memset(&cdev->private->irb, 0, sizeof(struct irb));
248         switch (ret) {
249         /* 0, -ETIME, -EOPNOTSUPP, -EAGAIN or -EACCES */
250         case 0:                 /* Sense id succeeded. */
251         case -ETIME:            /* Sense id stopped by timeout. */
252                 ccw_device_sense_id_done(cdev, ret);
253                 break;
254         case -EACCES:           /* channel is not operational. */
255         case -EAGAIN:           /* try again. */
256                 cdev->private->iretry--;
257                 if (cdev->private->iretry > 0) {
258                         ret = __ccw_device_sense_id_start(cdev);
259                         if (ret == 0 || ret == -EBUSY)
260                                 break;
261                 }
262                 /* fall through. */
263         default:                /* Sense ID failed. Try asking VM. */
264                 if (MACHINE_IS_VM) {
265                         VM_virtual_device_info (cdev->private->dev_id.devno,
266                                                 &cdev->private->senseid);
267                         if (cdev->private->senseid.cu_type != 0xFFFF) {
268                                 /* Got the device information from VM. */
269                                 ccw_device_sense_id_done(cdev, 0);
270                                 return;
271                         }
272                 }
273                 /*
274                  * If we can't couldn't identify the device type we
275                  *  consider the device "not operational".
276                  */
277                 ccw_device_sense_id_done(cdev, -ENODEV);
278                 break;
279         }
280 }