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12#include <linux/vfio.h>
13#include <linux/mdev.h>
14
15#include "ioasm.h"
16#include "vfio_ccw_private.h"
17
18static int fsm_io_helper(struct vfio_ccw_private *private)
19{
20 struct subchannel *sch;
21 union orb *orb;
22 int ccode;
23 __u8 lpm;
24 unsigned long flags;
25 int ret;
26
27 sch = private->sch;
28
29 spin_lock_irqsave(sch->lock, flags);
30
31 orb = cp_get_orb(&private->cp, (u32)(addr_t)sch, sch->lpm);
32 if (!orb) {
33 ret = -EIO;
34 goto out;
35 }
36
37 VFIO_CCW_TRACE_EVENT(5, "stIO");
38 VFIO_CCW_TRACE_EVENT(5, dev_name(&sch->dev));
39
40
41 ccode = ssch(sch->schid, orb);
42
43 VFIO_CCW_HEX_EVENT(5, &ccode, sizeof(ccode));
44
45 switch (ccode) {
46 case 0:
47
48
49
50 sch->schib.scsw.cmd.actl |= SCSW_ACTL_START_PEND;
51 ret = 0;
52 private->state = VFIO_CCW_STATE_CP_PENDING;
53 break;
54 case 1:
55 case 2:
56 ret = -EBUSY;
57 break;
58 case 3:
59 {
60 lpm = orb->cmd.lpm;
61 if (lpm != 0)
62 sch->lpm &= ~lpm;
63 else
64 sch->lpm = 0;
65
66 if (cio_update_schib(sch))
67 ret = -ENODEV;
68 else
69 ret = sch->lpm ? -EACCES : -ENODEV;
70 break;
71 }
72 default:
73 ret = ccode;
74 }
75out:
76 spin_unlock_irqrestore(sch->lock, flags);
77 return ret;
78}
79
80static int fsm_do_halt(struct vfio_ccw_private *private)
81{
82 struct subchannel *sch;
83 unsigned long flags;
84 int ccode;
85 int ret;
86
87 sch = private->sch;
88
89 spin_lock_irqsave(sch->lock, flags);
90
91 VFIO_CCW_TRACE_EVENT(2, "haltIO");
92 VFIO_CCW_TRACE_EVENT(2, dev_name(&sch->dev));
93
94
95 ccode = hsch(sch->schid);
96
97 VFIO_CCW_HEX_EVENT(2, &ccode, sizeof(ccode));
98
99 switch (ccode) {
100 case 0:
101
102
103
104 sch->schib.scsw.cmd.actl |= SCSW_ACTL_HALT_PEND;
105 ret = 0;
106 break;
107 case 1:
108 case 2:
109 ret = -EBUSY;
110 break;
111 case 3:
112 ret = -ENODEV;
113 break;
114 default:
115 ret = ccode;
116 }
117 spin_unlock_irqrestore(sch->lock, flags);
118 return ret;
119}
120
121static int fsm_do_clear(struct vfio_ccw_private *private)
122{
123 struct subchannel *sch;
124 unsigned long flags;
125 int ccode;
126 int ret;
127
128 sch = private->sch;
129
130 spin_lock_irqsave(sch->lock, flags);
131
132 VFIO_CCW_TRACE_EVENT(2, "clearIO");
133 VFIO_CCW_TRACE_EVENT(2, dev_name(&sch->dev));
134
135
136 ccode = csch(sch->schid);
137
138 VFIO_CCW_HEX_EVENT(2, &ccode, sizeof(ccode));
139
140 switch (ccode) {
141 case 0:
142
143
144
145 sch->schib.scsw.cmd.actl = SCSW_ACTL_CLEAR_PEND;
146
147 ret = 0;
148 break;
149 case 3:
150 ret = -ENODEV;
151 break;
152 default:
153 ret = ccode;
154 }
155 spin_unlock_irqrestore(sch->lock, flags);
156 return ret;
157}
158
159static void fsm_notoper(struct vfio_ccw_private *private,
160 enum vfio_ccw_event event)
161{
162 struct subchannel *sch = private->sch;
163
164 VFIO_CCW_TRACE_EVENT(2, "notoper");
165 VFIO_CCW_TRACE_EVENT(2, dev_name(&sch->dev));
166
167
168
169
170
171 css_sched_sch_todo(sch, SCH_TODO_UNREG);
172 private->state = VFIO_CCW_STATE_NOT_OPER;
173}
174
175
176
177
178static void fsm_nop(struct vfio_ccw_private *private,
179 enum vfio_ccw_event event)
180{
181}
182
183static void fsm_io_error(struct vfio_ccw_private *private,
184 enum vfio_ccw_event event)
185{
186 pr_err("vfio-ccw: FSM: I/O request from state:%d\n", private->state);
187 private->io_region->ret_code = -EIO;
188}
189
190static void fsm_io_busy(struct vfio_ccw_private *private,
191 enum vfio_ccw_event event)
192{
193 private->io_region->ret_code = -EBUSY;
194}
195
196static void fsm_io_retry(struct vfio_ccw_private *private,
197 enum vfio_ccw_event event)
198{
199 private->io_region->ret_code = -EAGAIN;
200}
201
202static void fsm_async_error(struct vfio_ccw_private *private,
203 enum vfio_ccw_event event)
204{
205 struct ccw_cmd_region *cmd_region = private->cmd_region;
206
207 pr_err("vfio-ccw: FSM: %s request from state:%d\n",
208 cmd_region->command == VFIO_CCW_ASYNC_CMD_HSCH ? "halt" :
209 cmd_region->command == VFIO_CCW_ASYNC_CMD_CSCH ? "clear" :
210 "<unknown>", private->state);
211 cmd_region->ret_code = -EIO;
212}
213
214static void fsm_async_retry(struct vfio_ccw_private *private,
215 enum vfio_ccw_event event)
216{
217 private->cmd_region->ret_code = -EAGAIN;
218}
219
220static void fsm_disabled_irq(struct vfio_ccw_private *private,
221 enum vfio_ccw_event event)
222{
223 struct subchannel *sch = private->sch;
224
225
226
227
228
229 cio_disable_subchannel(sch);
230}
231inline struct subchannel_id get_schid(struct vfio_ccw_private *p)
232{
233 return p->sch->schid;
234}
235
236
237
238
239static void fsm_io_request(struct vfio_ccw_private *private,
240 enum vfio_ccw_event event)
241{
242 union orb *orb;
243 union scsw *scsw = &private->scsw;
244 struct ccw_io_region *io_region = private->io_region;
245 struct mdev_device *mdev = private->mdev;
246 char *errstr = "request";
247 struct subchannel_id schid = get_schid(private);
248
249 private->state = VFIO_CCW_STATE_CP_PROCESSING;
250 memcpy(scsw, io_region->scsw_area, sizeof(*scsw));
251
252 if (scsw->cmd.fctl & SCSW_FCTL_START_FUNC) {
253 orb = (union orb *)io_region->orb_area;
254
255
256 if (orb->tm.b) {
257 io_region->ret_code = -EOPNOTSUPP;
258 VFIO_CCW_MSG_EVENT(2,
259 "%pUl (%x.%x.%04x): transport mode\n",
260 mdev_uuid(mdev), schid.cssid,
261 schid.ssid, schid.sch_no);
262 errstr = "transport mode";
263 goto err_out;
264 }
265 io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev),
266 orb);
267 if (io_region->ret_code) {
268 VFIO_CCW_MSG_EVENT(2,
269 "%pUl (%x.%x.%04x): cp_init=%d\n",
270 mdev_uuid(mdev), schid.cssid,
271 schid.ssid, schid.sch_no,
272 io_region->ret_code);
273 errstr = "cp init";
274 goto err_out;
275 }
276
277 io_region->ret_code = cp_prefetch(&private->cp);
278 if (io_region->ret_code) {
279 VFIO_CCW_MSG_EVENT(2,
280 "%pUl (%x.%x.%04x): cp_prefetch=%d\n",
281 mdev_uuid(mdev), schid.cssid,
282 schid.ssid, schid.sch_no,
283 io_region->ret_code);
284 errstr = "cp prefetch";
285 cp_free(&private->cp);
286 goto err_out;
287 }
288
289
290 io_region->ret_code = fsm_io_helper(private);
291 if (io_region->ret_code) {
292 VFIO_CCW_MSG_EVENT(2,
293 "%pUl (%x.%x.%04x): fsm_io_helper=%d\n",
294 mdev_uuid(mdev), schid.cssid,
295 schid.ssid, schid.sch_no,
296 io_region->ret_code);
297 errstr = "cp fsm_io_helper";
298 cp_free(&private->cp);
299 goto err_out;
300 }
301 return;
302 } else if (scsw->cmd.fctl & SCSW_FCTL_HALT_FUNC) {
303 VFIO_CCW_MSG_EVENT(2,
304 "%pUl (%x.%x.%04x): halt on io_region\n",
305 mdev_uuid(mdev), schid.cssid,
306 schid.ssid, schid.sch_no);
307
308 io_region->ret_code = -EOPNOTSUPP;
309 goto err_out;
310 } else if (scsw->cmd.fctl & SCSW_FCTL_CLEAR_FUNC) {
311 VFIO_CCW_MSG_EVENT(2,
312 "%pUl (%x.%x.%04x): clear on io_region\n",
313 mdev_uuid(mdev), schid.cssid,
314 schid.ssid, schid.sch_no);
315
316 io_region->ret_code = -EOPNOTSUPP;
317 goto err_out;
318 }
319
320err_out:
321 private->state = VFIO_CCW_STATE_IDLE;
322 trace_vfio_ccw_fsm_io_request(scsw->cmd.fctl, schid,
323 io_region->ret_code, errstr);
324}
325
326
327
328
329static void fsm_async_request(struct vfio_ccw_private *private,
330 enum vfio_ccw_event event)
331{
332 struct ccw_cmd_region *cmd_region = private->cmd_region;
333
334 switch (cmd_region->command) {
335 case VFIO_CCW_ASYNC_CMD_HSCH:
336 cmd_region->ret_code = fsm_do_halt(private);
337 break;
338 case VFIO_CCW_ASYNC_CMD_CSCH:
339 cmd_region->ret_code = fsm_do_clear(private);
340 break;
341 default:
342
343 cmd_region->ret_code = -EINVAL;
344 }
345
346 trace_vfio_ccw_fsm_async_request(get_schid(private),
347 cmd_region->command,
348 cmd_region->ret_code);
349}
350
351
352
353
354static void fsm_irq(struct vfio_ccw_private *private,
355 enum vfio_ccw_event event)
356{
357 struct irb *irb = this_cpu_ptr(&cio_irb);
358
359 VFIO_CCW_TRACE_EVENT(6, "IRQ");
360 VFIO_CCW_TRACE_EVENT(6, dev_name(&private->sch->dev));
361
362 memcpy(&private->irb, irb, sizeof(*irb));
363
364 queue_work(vfio_ccw_work_q, &private->io_work);
365
366 if (private->completion)
367 complete(private->completion);
368}
369
370
371
372
373fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS] = {
374 [VFIO_CCW_STATE_NOT_OPER] = {
375 [VFIO_CCW_EVENT_NOT_OPER] = fsm_nop,
376 [VFIO_CCW_EVENT_IO_REQ] = fsm_io_error,
377 [VFIO_CCW_EVENT_ASYNC_REQ] = fsm_async_error,
378 [VFIO_CCW_EVENT_INTERRUPT] = fsm_disabled_irq,
379 },
380 [VFIO_CCW_STATE_STANDBY] = {
381 [VFIO_CCW_EVENT_NOT_OPER] = fsm_notoper,
382 [VFIO_CCW_EVENT_IO_REQ] = fsm_io_error,
383 [VFIO_CCW_EVENT_ASYNC_REQ] = fsm_async_error,
384 [VFIO_CCW_EVENT_INTERRUPT] = fsm_irq,
385 },
386 [VFIO_CCW_STATE_IDLE] = {
387 [VFIO_CCW_EVENT_NOT_OPER] = fsm_notoper,
388 [VFIO_CCW_EVENT_IO_REQ] = fsm_io_request,
389 [VFIO_CCW_EVENT_ASYNC_REQ] = fsm_async_request,
390 [VFIO_CCW_EVENT_INTERRUPT] = fsm_irq,
391 },
392 [VFIO_CCW_STATE_CP_PROCESSING] = {
393 [VFIO_CCW_EVENT_NOT_OPER] = fsm_notoper,
394 [VFIO_CCW_EVENT_IO_REQ] = fsm_io_retry,
395 [VFIO_CCW_EVENT_ASYNC_REQ] = fsm_async_retry,
396 [VFIO_CCW_EVENT_INTERRUPT] = fsm_irq,
397 },
398 [VFIO_CCW_STATE_CP_PENDING] = {
399 [VFIO_CCW_EVENT_NOT_OPER] = fsm_notoper,
400 [VFIO_CCW_EVENT_IO_REQ] = fsm_io_busy,
401 [VFIO_CCW_EVENT_ASYNC_REQ] = fsm_async_request,
402 [VFIO_CCW_EVENT_INTERRUPT] = fsm_irq,
403 },
404};
405
