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13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/device.h>
16#include <linux/slab.h>
17#include <linux/uuid.h>
18#include <linux/mdev.h>
19
20#include <asm/isc.h>
21
22#include "chp.h"
23#include "ioasm.h"
24#include "css.h"
25#include "vfio_ccw_private.h"
26
27struct workqueue_struct *vfio_ccw_work_q;
28static struct kmem_cache *vfio_ccw_io_region;
29static struct kmem_cache *vfio_ccw_cmd_region;
30static struct kmem_cache *vfio_ccw_schib_region;
31static struct kmem_cache *vfio_ccw_crw_region;
32
33debug_info_t *vfio_ccw_debug_msg_id;
34debug_info_t *vfio_ccw_debug_trace_id;
35
36
37
38
39int vfio_ccw_sch_quiesce(struct subchannel *sch)
40{
41 struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
42 DECLARE_COMPLETION_ONSTACK(completion);
43 int iretry, ret = 0;
44
45 spin_lock_irq(sch->lock);
46 if (!sch->schib.pmcw.ena)
47 goto out_unlock;
48 ret = cio_disable_subchannel(sch);
49 if (ret != -EBUSY)
50 goto out_unlock;
51
52 iretry = 255;
53 do {
54
55 ret = cio_cancel_halt_clear(sch, &iretry);
56
57 if (ret == -EIO) {
58 pr_err("vfio_ccw: could not quiesce subchannel 0.%x.%04x!\n",
59 sch->schid.ssid, sch->schid.sch_no);
60 break;
61 }
62
63
64
65
66
67 private->completion = &completion;
68 spin_unlock_irq(sch->lock);
69
70 if (ret == -EBUSY)
71 wait_for_completion_timeout(&completion, 3*HZ);
72
73 private->completion = NULL;
74 flush_workqueue(vfio_ccw_work_q);
75 spin_lock_irq(sch->lock);
76 ret = cio_disable_subchannel(sch);
77 } while (ret == -EBUSY);
78out_unlock:
79 private->state = VFIO_CCW_STATE_NOT_OPER;
80 spin_unlock_irq(sch->lock);
81 return ret;
82}
83
84static void vfio_ccw_sch_io_todo(struct work_struct *work)
85{
86 struct vfio_ccw_private *private;
87 struct irb *irb;
88 bool is_final;
89 bool cp_is_finished = false;
90
91 private = container_of(work, struct vfio_ccw_private, io_work);
92 irb = &private->irb;
93
94 is_final = !(scsw_actl(&irb->scsw) &
95 (SCSW_ACTL_DEVACT | SCSW_ACTL_SCHACT));
96 if (scsw_is_solicited(&irb->scsw)) {
97 cp_update_scsw(&private->cp, &irb->scsw);
98 if (is_final && private->state == VFIO_CCW_STATE_CP_PENDING) {
99 cp_free(&private->cp);
100 cp_is_finished = true;
101 }
102 }
103 mutex_lock(&private->io_mutex);
104 memcpy(private->io_region->irb_area, irb, sizeof(*irb));
105 mutex_unlock(&private->io_mutex);
106
107
108
109
110
111
112 if (private->mdev && cp_is_finished)
113 private->state = VFIO_CCW_STATE_IDLE;
114
115 if (private->io_trigger)
116 eventfd_signal(private->io_trigger, 1);
117}
118
119static void vfio_ccw_crw_todo(struct work_struct *work)
120{
121 struct vfio_ccw_private *private;
122
123 private = container_of(work, struct vfio_ccw_private, crw_work);
124
125 if (!list_empty(&private->crw) && private->crw_trigger)
126 eventfd_signal(private->crw_trigger, 1);
127}
128
129
130
131
132static void vfio_ccw_sch_irq(struct subchannel *sch)
133{
134 struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
135
136 inc_irq_stat(IRQIO_CIO);
137 vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_INTERRUPT);
138}
139
140static void vfio_ccw_free_regions(struct vfio_ccw_private *private)
141{
142 if (private->crw_region)
143 kmem_cache_free(vfio_ccw_crw_region, private->crw_region);
144 if (private->schib_region)
145 kmem_cache_free(vfio_ccw_schib_region, private->schib_region);
146 if (private->cmd_region)
147 kmem_cache_free(vfio_ccw_cmd_region, private->cmd_region);
148 if (private->io_region)
149 kmem_cache_free(vfio_ccw_io_region, private->io_region);
150}
151
152static int vfio_ccw_sch_probe(struct subchannel *sch)
153{
154 struct pmcw *pmcw = &sch->schib.pmcw;
155 struct vfio_ccw_private *private;
156 int ret = -ENOMEM;
157
158 if (pmcw->qf) {
159 dev_warn(&sch->dev, "vfio: ccw: does not support QDIO: %s\n",
160 dev_name(&sch->dev));
161 return -ENODEV;
162 }
163
164 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
165 if (!private)
166 return -ENOMEM;
167
168 private->cp.guest_cp = kcalloc(CCWCHAIN_LEN_MAX, sizeof(struct ccw1),
169 GFP_KERNEL);
170 if (!private->cp.guest_cp)
171 goto out_free;
172
173 private->io_region = kmem_cache_zalloc(vfio_ccw_io_region,
174 GFP_KERNEL | GFP_DMA);
175 if (!private->io_region)
176 goto out_free;
177
178 private->cmd_region = kmem_cache_zalloc(vfio_ccw_cmd_region,
179 GFP_KERNEL | GFP_DMA);
180 if (!private->cmd_region)
181 goto out_free;
182
183 private->schib_region = kmem_cache_zalloc(vfio_ccw_schib_region,
184 GFP_KERNEL | GFP_DMA);
185
186 if (!private->schib_region)
187 goto out_free;
188
189 private->crw_region = kmem_cache_zalloc(vfio_ccw_crw_region,
190 GFP_KERNEL | GFP_DMA);
191
192 if (!private->crw_region)
193 goto out_free;
194
195 private->sch = sch;
196 dev_set_drvdata(&sch->dev, private);
197 mutex_init(&private->io_mutex);
198
199 spin_lock_irq(sch->lock);
200 private->state = VFIO_CCW_STATE_NOT_OPER;
201 sch->isc = VFIO_CCW_ISC;
202 ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
203 spin_unlock_irq(sch->lock);
204 if (ret)
205 goto out_free;
206
207 INIT_LIST_HEAD(&private->crw);
208 INIT_WORK(&private->io_work, vfio_ccw_sch_io_todo);
209 INIT_WORK(&private->crw_work, vfio_ccw_crw_todo);
210 atomic_set(&private->avail, 1);
211 private->state = VFIO_CCW_STATE_STANDBY;
212
213 ret = vfio_ccw_mdev_reg(sch);
214 if (ret)
215 goto out_disable;
216
217 if (dev_get_uevent_suppress(&sch->dev)) {
218 dev_set_uevent_suppress(&sch->dev, 0);
219 kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
220 }
221
222 VFIO_CCW_MSG_EVENT(4, "bound to subchannel %x.%x.%04x\n",
223 sch->schid.cssid, sch->schid.ssid,
224 sch->schid.sch_no);
225 return 0;
226
227out_disable:
228 cio_disable_subchannel(sch);
229out_free:
230 dev_set_drvdata(&sch->dev, NULL);
231 vfio_ccw_free_regions(private);
232 kfree(private->cp.guest_cp);
233 kfree(private);
234 return ret;
235}
236
237static void vfio_ccw_sch_remove(struct subchannel *sch)
238{
239 struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
240 struct vfio_ccw_crw *crw, *temp;
241
242 vfio_ccw_sch_quiesce(sch);
243
244 list_for_each_entry_safe(crw, temp, &private->crw, next) {
245 list_del(&crw->next);
246 kfree(crw);
247 }
248
249 vfio_ccw_mdev_unreg(sch);
250
251 dev_set_drvdata(&sch->dev, NULL);
252
253 vfio_ccw_free_regions(private);
254 kfree(private->cp.guest_cp);
255 kfree(private);
256
257 VFIO_CCW_MSG_EVENT(4, "unbound from subchannel %x.%x.%04x\n",
258 sch->schid.cssid, sch->schid.ssid,
259 sch->schid.sch_no);
260}
261
262static void vfio_ccw_sch_shutdown(struct subchannel *sch)
263{
264 vfio_ccw_sch_quiesce(sch);
265}
266
267
268
269
270
271
272
273
274
275
276
277static int vfio_ccw_sch_event(struct subchannel *sch, int process)
278{
279 struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
280 unsigned long flags;
281 int rc = -EAGAIN;
282
283 spin_lock_irqsave(sch->lock, flags);
284 if (!device_is_registered(&sch->dev))
285 goto out_unlock;
286
287 if (work_pending(&sch->todo_work))
288 goto out_unlock;
289
290 if (cio_update_schib(sch)) {
291 vfio_ccw_fsm_event(private, VFIO_CCW_EVENT_NOT_OPER);
292 rc = 0;
293 goto out_unlock;
294 }
295
296 private = dev_get_drvdata(&sch->dev);
297 if (private->state == VFIO_CCW_STATE_NOT_OPER) {
298 private->state = private->mdev ? VFIO_CCW_STATE_IDLE :
299 VFIO_CCW_STATE_STANDBY;
300 }
301 rc = 0;
302
303out_unlock:
304 spin_unlock_irqrestore(sch->lock, flags);
305
306 return rc;
307}
308
309static void vfio_ccw_queue_crw(struct vfio_ccw_private *private,
310 unsigned int rsc,
311 unsigned int erc,
312 unsigned int rsid)
313{
314 struct vfio_ccw_crw *crw;
315
316
317
318
319
320
321 crw = kzalloc(sizeof(*crw), GFP_ATOMIC);
322 if (!crw)
323 return;
324
325
326
327
328 crw->crw.rsc = rsc;
329 crw->crw.erc = erc;
330 crw->crw.rsid = rsid;
331
332 list_add_tail(&crw->next, &private->crw);
333 queue_work(vfio_ccw_work_q, &private->crw_work);
334}
335
336static int vfio_ccw_chp_event(struct subchannel *sch,
337 struct chp_link *link, int event)
338{
339 struct vfio_ccw_private *private = dev_get_drvdata(&sch->dev);
340 int mask = chp_ssd_get_mask(&sch->ssd_info, link);
341 int retry = 255;
342
343 if (!private || !mask)
344 return 0;
345
346 trace_vfio_ccw_chp_event(private->sch->schid, mask, event);
347 VFIO_CCW_MSG_EVENT(2, "%pUl (%x.%x.%04x): mask=0x%x event=%d\n",
348 mdev_uuid(private->mdev), sch->schid.cssid,
349 sch->schid.ssid, sch->schid.sch_no,
350 mask, event);
351
352 if (cio_update_schib(sch))
353 return -ENODEV;
354
355 switch (event) {
356 case CHP_VARY_OFF:
357
358 sch->opm &= ~mask;
359 sch->lpm &= ~mask;
360 if (sch->schib.pmcw.lpum & mask)
361 cio_cancel_halt_clear(sch, &retry);
362 break;
363 case CHP_OFFLINE:
364
365 if (sch->schib.pmcw.lpum & mask)
366 cio_cancel_halt_clear(sch, &retry);
367 vfio_ccw_queue_crw(private, CRW_RSC_CPATH, CRW_ERC_PERRN,
368 link->chpid.id);
369 break;
370 case CHP_VARY_ON:
371
372 sch->opm |= mask;
373 sch->lpm |= mask;
374 break;
375 case CHP_ONLINE:
376
377 sch->lpm |= mask & sch->opm;
378 vfio_ccw_queue_crw(private, CRW_RSC_CPATH, CRW_ERC_INIT,
379 link->chpid.id);
380 break;
381 }
382
383 return 0;
384}
385
386static struct css_device_id vfio_ccw_sch_ids[] = {
387 { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
388 { },
389};
390MODULE_DEVICE_TABLE(css, vfio_ccw_sch_ids);
391
392static struct css_driver vfio_ccw_sch_driver = {
393 .drv = {
394 .name = "vfio_ccw",
395 .owner = THIS_MODULE,
396 },
397 .subchannel_type = vfio_ccw_sch_ids,
398 .irq = vfio_ccw_sch_irq,
399 .probe = vfio_ccw_sch_probe,
400 .remove = vfio_ccw_sch_remove,
401 .shutdown = vfio_ccw_sch_shutdown,
402 .sch_event = vfio_ccw_sch_event,
403 .chp_event = vfio_ccw_chp_event,
404};
405
406static int __init vfio_ccw_debug_init(void)
407{
408 vfio_ccw_debug_msg_id = debug_register("vfio_ccw_msg", 16, 1,
409 11 * sizeof(long));
410 if (!vfio_ccw_debug_msg_id)
411 goto out_unregister;
412 debug_register_view(vfio_ccw_debug_msg_id, &debug_sprintf_view);
413 debug_set_level(vfio_ccw_debug_msg_id, 2);
414 vfio_ccw_debug_trace_id = debug_register("vfio_ccw_trace", 16, 1, 16);
415 if (!vfio_ccw_debug_trace_id)
416 goto out_unregister;
417 debug_register_view(vfio_ccw_debug_trace_id, &debug_hex_ascii_view);
418 debug_set_level(vfio_ccw_debug_trace_id, 2);
419 return 0;
420
421out_unregister:
422 debug_unregister(vfio_ccw_debug_msg_id);
423 debug_unregister(vfio_ccw_debug_trace_id);
424 return -1;
425}
426
427static void vfio_ccw_debug_exit(void)
428{
429 debug_unregister(vfio_ccw_debug_msg_id);
430 debug_unregister(vfio_ccw_debug_trace_id);
431}
432
433static void vfio_ccw_destroy_regions(void)
434{
435 kmem_cache_destroy(vfio_ccw_crw_region);
436 kmem_cache_destroy(vfio_ccw_schib_region);
437 kmem_cache_destroy(vfio_ccw_cmd_region);
438 kmem_cache_destroy(vfio_ccw_io_region);
439}
440
441static int __init vfio_ccw_sch_init(void)
442{
443 int ret;
444
445 ret = vfio_ccw_debug_init();
446 if (ret)
447 return ret;
448
449 vfio_ccw_work_q = create_singlethread_workqueue("vfio-ccw");
450 if (!vfio_ccw_work_q) {
451 ret = -ENOMEM;
452 goto out_err;
453 }
454
455 vfio_ccw_io_region = kmem_cache_create_usercopy("vfio_ccw_io_region",
456 sizeof(struct ccw_io_region), 0,
457 SLAB_ACCOUNT, 0,
458 sizeof(struct ccw_io_region), NULL);
459 if (!vfio_ccw_io_region) {
460 ret = -ENOMEM;
461 goto out_err;
462 }
463
464 vfio_ccw_cmd_region = kmem_cache_create_usercopy("vfio_ccw_cmd_region",
465 sizeof(struct ccw_cmd_region), 0,
466 SLAB_ACCOUNT, 0,
467 sizeof(struct ccw_cmd_region), NULL);
468 if (!vfio_ccw_cmd_region) {
469 ret = -ENOMEM;
470 goto out_err;
471 }
472
473 vfio_ccw_schib_region = kmem_cache_create_usercopy("vfio_ccw_schib_region",
474 sizeof(struct ccw_schib_region), 0,
475 SLAB_ACCOUNT, 0,
476 sizeof(struct ccw_schib_region), NULL);
477
478 if (!vfio_ccw_schib_region) {
479 ret = -ENOMEM;
480 goto out_err;
481 }
482
483 vfio_ccw_crw_region = kmem_cache_create_usercopy("vfio_ccw_crw_region",
484 sizeof(struct ccw_crw_region), 0,
485 SLAB_ACCOUNT, 0,
486 sizeof(struct ccw_crw_region), NULL);
487
488 if (!vfio_ccw_crw_region) {
489 ret = -ENOMEM;
490 goto out_err;
491 }
492
493 isc_register(VFIO_CCW_ISC);
494 ret = css_driver_register(&vfio_ccw_sch_driver);
495 if (ret) {
496 isc_unregister(VFIO_CCW_ISC);
497 goto out_err;
498 }
499
500 return ret;
501
502out_err:
503 vfio_ccw_destroy_regions();
504 destroy_workqueue(vfio_ccw_work_q);
505 vfio_ccw_debug_exit();
506 return ret;
507}
508
509static void __exit vfio_ccw_sch_exit(void)
510{
511 css_driver_unregister(&vfio_ccw_sch_driver);
512 isc_unregister(VFIO_CCW_ISC);
513 vfio_ccw_destroy_regions();
514 destroy_workqueue(vfio_ccw_work_q);
515 vfio_ccw_debug_exit();
516}
517module_init(vfio_ccw_sch_init);
518module_exit(vfio_ccw_sch_exit);
519
520MODULE_LICENSE("GPL v2");
521
