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eadb86ab SO |
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 | ||
2e73c2cf | 8 | #include <linux/kernel_stat.h> |
eadb86ab SO |
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 | ||
420f42ec | 142 | inc_irq_stat(IRQIO_ADM); |
2e73c2cf | 143 | |
eadb86ab SO |
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); |