diff options
Diffstat (limited to 'drivers/s390/cio/eadm_sch.c')
-rw-r--r-- | drivers/s390/cio/eadm_sch.c | 401 |
1 files changed, 0 insertions, 401 deletions
diff --git a/drivers/s390/cio/eadm_sch.c b/drivers/s390/cio/eadm_sch.c deleted file mode 100644 index d9eddcba7e8..00000000000 --- a/drivers/s390/cio/eadm_sch.c +++ /dev/null | |||
@@ -1,401 +0,0 @@ | |||
1 | /* | ||
2 | * Driver for s390 eadm subchannels | ||
3 | * | ||
4 | * Copyright IBM Corp. 2012 | ||
5 | * Author(s): Sebastian Ott <sebott@linux.vnet.ibm.com> | ||
6 | */ | ||
7 | |||
8 | #include <linux/kernel_stat.h> | ||
9 | #include <linux/workqueue.h> | ||
10 | #include <linux/spinlock.h> | ||
11 | #include <linux/device.h> | ||
12 | #include <linux/module.h> | ||
13 | #include <linux/timer.h> | ||
14 | #include <linux/slab.h> | ||
15 | #include <linux/list.h> | ||
16 | |||
17 | #include <asm/css_chars.h> | ||
18 | #include <asm/debug.h> | ||
19 | #include <asm/isc.h> | ||
20 | #include <asm/cio.h> | ||
21 | #include <asm/scsw.h> | ||
22 | #include <asm/eadm.h> | ||
23 | |||
24 | #include "eadm_sch.h" | ||
25 | #include "ioasm.h" | ||
26 | #include "cio.h" | ||
27 | #include "css.h" | ||
28 | #include "orb.h" | ||
29 | |||
30 | MODULE_DESCRIPTION("driver for s390 eadm subchannels"); | ||
31 | MODULE_LICENSE("GPL"); | ||
32 | |||
33 | #define EADM_TIMEOUT (5 * HZ) | ||
34 | static DEFINE_SPINLOCK(list_lock); | ||
35 | static LIST_HEAD(eadm_list); | ||
36 | |||
37 | static debug_info_t *eadm_debug; | ||
38 | |||
39 | #define EADM_LOG(imp, txt) do { \ | ||
40 | debug_text_event(eadm_debug, imp, txt); \ | ||
41 | } while (0) | ||
42 | |||
43 | static void EADM_LOG_HEX(int level, void *data, int length) | ||
44 | { | ||
45 | if (level > eadm_debug->level) | ||
46 | return; | ||
47 | while (length > 0) { | ||
48 | debug_event(eadm_debug, level, data, length); | ||
49 | length -= eadm_debug->buf_size; | ||
50 | data += eadm_debug->buf_size; | ||
51 | } | ||
52 | } | ||
53 | |||
54 | static void orb_init(union orb *orb) | ||
55 | { | ||
56 | memset(orb, 0, sizeof(union orb)); | ||
57 | orb->eadm.compat1 = 1; | ||
58 | orb->eadm.compat2 = 1; | ||
59 | orb->eadm.fmt = 1; | ||
60 | orb->eadm.x = 1; | ||
61 | } | ||
62 | |||
63 | static int eadm_subchannel_start(struct subchannel *sch, struct aob *aob) | ||
64 | { | ||
65 | union orb *orb = &get_eadm_private(sch)->orb; | ||
66 | int cc; | ||
67 | |||
68 | orb_init(orb); | ||
69 | orb->eadm.aob = (u32)__pa(aob); | ||
70 | orb->eadm.intparm = (u32)(addr_t)sch; | ||
71 | orb->eadm.key = PAGE_DEFAULT_KEY >> 4; | ||
72 | |||
73 | EADM_LOG(6, "start"); | ||
74 | EADM_LOG_HEX(6, &sch->schid, sizeof(sch->schid)); | ||
75 | |||
76 | cc = ssch(sch->schid, orb); | ||
77 | switch (cc) { | ||
78 | case 0: | ||
79 | sch->schib.scsw.eadm.actl |= SCSW_ACTL_START_PEND; | ||
80 | break; | ||
81 | case 1: /* status pending */ | ||
82 | case 2: /* busy */ | ||
83 | return -EBUSY; | ||
84 | case 3: /* not operational */ | ||
85 | return -ENODEV; | ||
86 | } | ||
87 | return 0; | ||
88 | } | ||
89 | |||
90 | static int eadm_subchannel_clear(struct subchannel *sch) | ||
91 | { | ||
92 | int cc; | ||
93 | |||
94 | cc = csch(sch->schid); | ||
95 | if (cc) | ||
96 | return -ENODEV; | ||
97 | |||
98 | sch->schib.scsw.eadm.actl |= SCSW_ACTL_CLEAR_PEND; | ||
99 | return 0; | ||
100 | } | ||
101 | |||
102 | static void eadm_subchannel_timeout(unsigned long data) | ||
103 | { | ||
104 | struct subchannel *sch = (struct subchannel *) data; | ||
105 | |||
106 | spin_lock_irq(sch->lock); | ||
107 | EADM_LOG(1, "timeout"); | ||
108 | EADM_LOG_HEX(1, &sch->schid, sizeof(sch->schid)); | ||
109 | if (eadm_subchannel_clear(sch)) | ||
110 | EADM_LOG(0, "clear failed"); | ||
111 | spin_unlock_irq(sch->lock); | ||
112 | } | ||
113 | |||
114 | static void eadm_subchannel_set_timeout(struct subchannel *sch, int expires) | ||
115 | { | ||
116 | struct eadm_private *private = get_eadm_private(sch); | ||
117 | |||
118 | if (expires == 0) { | ||
119 | del_timer(&private->timer); | ||
120 | return; | ||
121 | } | ||
122 | if (timer_pending(&private->timer)) { | ||
123 | if (mod_timer(&private->timer, jiffies + expires)) | ||
124 | return; | ||
125 | } | ||
126 | private->timer.function = eadm_subchannel_timeout; | ||
127 | private->timer.data = (unsigned long) sch; | ||
128 | private->timer.expires = jiffies + expires; | ||
129 | add_timer(&private->timer); | ||
130 | } | ||
131 | |||
132 | static void eadm_subchannel_irq(struct subchannel *sch) | ||
133 | { | ||
134 | struct eadm_private *private = get_eadm_private(sch); | ||
135 | struct eadm_scsw *scsw = &sch->schib.scsw.eadm; | ||
136 | struct irb *irb = (struct irb *)&S390_lowcore.irb; | ||
137 | int error = 0; | ||
138 | |||
139 | EADM_LOG(6, "irq"); | ||
140 | EADM_LOG_HEX(6, irb, sizeof(*irb)); | ||
141 | |||
142 | inc_irq_stat(IRQIO_ADM); | ||
143 | |||
144 | if ((scsw->stctl & (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)) | ||
145 | && scsw->eswf == 1 && irb->esw.eadm.erw.r) | ||
146 | error = -EIO; | ||
147 | |||
148 | if (scsw->fctl & SCSW_FCTL_CLEAR_FUNC) | ||
149 | error = -ETIMEDOUT; | ||
150 | |||
151 | eadm_subchannel_set_timeout(sch, 0); | ||
152 | |||
153 | if (private->state != EADM_BUSY) { | ||
154 | EADM_LOG(1, "irq unsol"); | ||
155 | EADM_LOG_HEX(1, irb, sizeof(*irb)); | ||
156 | private->state = EADM_NOT_OPER; | ||
157 | css_sched_sch_todo(sch, SCH_TODO_EVAL); | ||
158 | return; | ||
159 | } | ||
160 | scm_irq_handler((struct aob *)(unsigned long)scsw->aob, error); | ||
161 | private->state = EADM_IDLE; | ||
162 | } | ||
163 | |||
164 | static struct subchannel *eadm_get_idle_sch(void) | ||
165 | { | ||
166 | struct eadm_private *private; | ||
167 | struct subchannel *sch; | ||
168 | unsigned long flags; | ||
169 | |||
170 | spin_lock_irqsave(&list_lock, flags); | ||
171 | list_for_each_entry(private, &eadm_list, head) { | ||
172 | sch = private->sch; | ||
173 | spin_lock(sch->lock); | ||
174 | if (private->state == EADM_IDLE) { | ||
175 | private->state = EADM_BUSY; | ||
176 | list_move_tail(&private->head, &eadm_list); | ||
177 | spin_unlock(sch->lock); | ||
178 | spin_unlock_irqrestore(&list_lock, flags); | ||
179 | |||
180 | return sch; | ||
181 | } | ||
182 | spin_unlock(sch->lock); | ||
183 | } | ||
184 | spin_unlock_irqrestore(&list_lock, flags); | ||
185 | |||
186 | return NULL; | ||
187 | } | ||
188 | |||
189 | static int eadm_start_aob(struct aob *aob) | ||
190 | { | ||
191 | struct eadm_private *private; | ||
192 | struct subchannel *sch; | ||
193 | unsigned long flags; | ||
194 | int ret; | ||
195 | |||
196 | sch = eadm_get_idle_sch(); | ||
197 | if (!sch) | ||
198 | return -EBUSY; | ||
199 | |||
200 | spin_lock_irqsave(sch->lock, flags); | ||
201 | eadm_subchannel_set_timeout(sch, EADM_TIMEOUT); | ||
202 | ret = eadm_subchannel_start(sch, aob); | ||
203 | if (!ret) | ||
204 | goto out_unlock; | ||
205 | |||
206 | /* Handle start subchannel failure. */ | ||
207 | eadm_subchannel_set_timeout(sch, 0); | ||
208 | private = get_eadm_private(sch); | ||
209 | private->state = EADM_NOT_OPER; | ||
210 | css_sched_sch_todo(sch, SCH_TODO_EVAL); | ||
211 | |||
212 | out_unlock: | ||
213 | spin_unlock_irqrestore(sch->lock, flags); | ||
214 | |||
215 | return ret; | ||
216 | } | ||
217 | |||
218 | static int eadm_subchannel_probe(struct subchannel *sch) | ||
219 | { | ||
220 | struct eadm_private *private; | ||
221 | int ret; | ||
222 | |||
223 | private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA); | ||
224 | if (!private) | ||
225 | return -ENOMEM; | ||
226 | |||
227 | INIT_LIST_HEAD(&private->head); | ||
228 | init_timer(&private->timer); | ||
229 | |||
230 | spin_lock_irq(sch->lock); | ||
231 | set_eadm_private(sch, private); | ||
232 | private->state = EADM_IDLE; | ||
233 | private->sch = sch; | ||
234 | sch->isc = EADM_SCH_ISC; | ||
235 | ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch); | ||
236 | if (ret) { | ||
237 | set_eadm_private(sch, NULL); | ||
238 | spin_unlock_irq(sch->lock); | ||
239 | kfree(private); | ||
240 | goto out; | ||
241 | } | ||
242 | spin_unlock_irq(sch->lock); | ||
243 | |||
244 | spin_lock_irq(&list_lock); | ||
245 | list_add(&private->head, &eadm_list); | ||
246 | spin_unlock_irq(&list_lock); | ||
247 | |||
248 | if (dev_get_uevent_suppress(&sch->dev)) { | ||
249 | dev_set_uevent_suppress(&sch->dev, 0); | ||
250 | kobject_uevent(&sch->dev.kobj, KOBJ_ADD); | ||
251 | } | ||
252 | out: | ||
253 | return ret; | ||
254 | } | ||
255 | |||
256 | static void eadm_quiesce(struct subchannel *sch) | ||
257 | { | ||
258 | int ret; | ||
259 | |||
260 | do { | ||
261 | spin_lock_irq(sch->lock); | ||
262 | ret = cio_disable_subchannel(sch); | ||
263 | spin_unlock_irq(sch->lock); | ||
264 | } while (ret == -EBUSY); | ||
265 | } | ||
266 | |||
267 | static int eadm_subchannel_remove(struct subchannel *sch) | ||
268 | { | ||
269 | struct eadm_private *private = get_eadm_private(sch); | ||
270 | |||
271 | spin_lock_irq(&list_lock); | ||
272 | list_del(&private->head); | ||
273 | spin_unlock_irq(&list_lock); | ||
274 | |||
275 | eadm_quiesce(sch); | ||
276 | |||
277 | spin_lock_irq(sch->lock); | ||
278 | set_eadm_private(sch, NULL); | ||
279 | spin_unlock_irq(sch->lock); | ||
280 | |||
281 | kfree(private); | ||
282 | |||
283 | return 0; | ||
284 | } | ||
285 | |||
286 | static void eadm_subchannel_shutdown(struct subchannel *sch) | ||
287 | { | ||
288 | eadm_quiesce(sch); | ||
289 | } | ||
290 | |||
291 | static int eadm_subchannel_freeze(struct subchannel *sch) | ||
292 | { | ||
293 | return cio_disable_subchannel(sch); | ||
294 | } | ||
295 | |||
296 | static int eadm_subchannel_restore(struct subchannel *sch) | ||
297 | { | ||
298 | return cio_enable_subchannel(sch, (u32)(unsigned long)sch); | ||
299 | } | ||
300 | |||
301 | /** | ||
302 | * eadm_subchannel_sch_event - process subchannel event | ||
303 | * @sch: subchannel | ||
304 | * @process: non-zero if function is called in process context | ||
305 | * | ||
306 | * An unspecified event occurred for this subchannel. Adjust data according | ||
307 | * to the current operational state of the subchannel. Return zero when the | ||
308 | * event has been handled sufficiently or -EAGAIN when this function should | ||
309 | * be called again in process context. | ||
310 | */ | ||
311 | static int eadm_subchannel_sch_event(struct subchannel *sch, int process) | ||
312 | { | ||
313 | struct eadm_private *private; | ||
314 | unsigned long flags; | ||
315 | int ret = 0; | ||
316 | |||
317 | spin_lock_irqsave(sch->lock, flags); | ||
318 | if (!device_is_registered(&sch->dev)) | ||
319 | goto out_unlock; | ||
320 | |||
321 | if (work_pending(&sch->todo_work)) | ||
322 | goto out_unlock; | ||
323 | |||
324 | if (cio_update_schib(sch)) { | ||
325 | css_sched_sch_todo(sch, SCH_TODO_UNREG); | ||
326 | goto out_unlock; | ||
327 | } | ||
328 | private = get_eadm_private(sch); | ||
329 | if (private->state == EADM_NOT_OPER) | ||
330 | private->state = EADM_IDLE; | ||
331 | |||
332 | out_unlock: | ||
333 | spin_unlock_irqrestore(sch->lock, flags); | ||
334 | |||
335 | return ret; | ||
336 | } | ||
337 | |||
338 | static struct css_device_id eadm_subchannel_ids[] = { | ||
339 | { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_ADM, }, | ||
340 | { /* end of list */ }, | ||
341 | }; | ||
342 | MODULE_DEVICE_TABLE(css, eadm_subchannel_ids); | ||
343 | |||
344 | static struct css_driver eadm_subchannel_driver = { | ||
345 | .drv = { | ||
346 | .name = "eadm_subchannel", | ||
347 | .owner = THIS_MODULE, | ||
348 | }, | ||
349 | .subchannel_type = eadm_subchannel_ids, | ||
350 | .irq = eadm_subchannel_irq, | ||
351 | .probe = eadm_subchannel_probe, | ||
352 | .remove = eadm_subchannel_remove, | ||
353 | .shutdown = eadm_subchannel_shutdown, | ||
354 | .sch_event = eadm_subchannel_sch_event, | ||
355 | .freeze = eadm_subchannel_freeze, | ||
356 | .thaw = eadm_subchannel_restore, | ||
357 | .restore = eadm_subchannel_restore, | ||
358 | }; | ||
359 | |||
360 | static struct eadm_ops eadm_ops = { | ||
361 | .eadm_start = eadm_start_aob, | ||
362 | .owner = THIS_MODULE, | ||
363 | }; | ||
364 | |||
365 | static int __init eadm_sch_init(void) | ||
366 | { | ||
367 | int ret; | ||
368 | |||
369 | if (!css_general_characteristics.eadm) | ||
370 | return -ENXIO; | ||
371 | |||
372 | eadm_debug = debug_register("eadm_log", 16, 1, 16); | ||
373 | if (!eadm_debug) | ||
374 | return -ENOMEM; | ||
375 | |||
376 | debug_register_view(eadm_debug, &debug_hex_ascii_view); | ||
377 | debug_set_level(eadm_debug, 2); | ||
378 | |||
379 | isc_register(EADM_SCH_ISC); | ||
380 | ret = css_driver_register(&eadm_subchannel_driver); | ||
381 | if (ret) | ||
382 | goto cleanup; | ||
383 | |||
384 | register_eadm_ops(&eadm_ops); | ||
385 | return ret; | ||
386 | |||
387 | cleanup: | ||
388 | isc_unregister(EADM_SCH_ISC); | ||
389 | debug_unregister(eadm_debug); | ||
390 | return ret; | ||
391 | } | ||
392 | |||
393 | static void __exit eadm_sch_exit(void) | ||
394 | { | ||
395 | unregister_eadm_ops(&eadm_ops); | ||
396 | css_driver_unregister(&eadm_subchannel_driver); | ||
397 | isc_unregister(EADM_SCH_ISC); | ||
398 | debug_unregister(eadm_debug); | ||
399 | } | ||
400 | module_init(eadm_sch_init); | ||
401 | module_exit(eadm_sch_exit); | ||