diff options
Diffstat (limited to 'arch/powerpc/platforms/iseries/viopath.c')
-rw-r--r-- | arch/powerpc/platforms/iseries/viopath.c | 677 |
1 files changed, 677 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/iseries/viopath.c b/arch/powerpc/platforms/iseries/viopath.c new file mode 100644 index 00000000000..2376069cdc1 --- /dev/null +++ b/arch/powerpc/platforms/iseries/viopath.c | |||
@@ -0,0 +1,677 @@ | |||
1 | /* -*- linux-c -*- | ||
2 | * | ||
3 | * iSeries Virtual I/O Message Path code | ||
4 | * | ||
5 | * Authors: Dave Boutcher <boutcher@us.ibm.com> | ||
6 | * Ryan Arnold <ryanarn@us.ibm.com> | ||
7 | * Colin Devilbiss <devilbis@us.ibm.com> | ||
8 | * | ||
9 | * (C) Copyright 2000-2005 IBM Corporation | ||
10 | * | ||
11 | * This code is used by the iSeries virtual disk, cd, | ||
12 | * tape, and console to communicate with OS/400 in another | ||
13 | * partition. | ||
14 | * | ||
15 | * This program is free software; you can redistribute it and/or | ||
16 | * modify it under the terms of the GNU General Public License as | ||
17 | * published by the Free Software Foundation; either version 2 of the | ||
18 | * License, or (at your option) anyu later version. | ||
19 | * | ||
20 | * This program is distributed in the hope that it will be useful, but | ||
21 | * WITHOUT ANY WARRANTY; without even the implied warranty of | ||
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
23 | * General Public License for more details. | ||
24 | * | ||
25 | * You should have received a copy of the GNU General Public License | ||
26 | * along with this program; if not, write to the Free Software Foundation, | ||
27 | * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
28 | * | ||
29 | */ | ||
30 | #include <linux/module.h> | ||
31 | #include <linux/kernel.h> | ||
32 | #include <linux/slab.h> | ||
33 | #include <linux/errno.h> | ||
34 | #include <linux/vmalloc.h> | ||
35 | #include <linux/string.h> | ||
36 | #include <linux/proc_fs.h> | ||
37 | #include <linux/dma-mapping.h> | ||
38 | #include <linux/wait.h> | ||
39 | #include <linux/seq_file.h> | ||
40 | #include <linux/interrupt.h> | ||
41 | #include <linux/completion.h> | ||
42 | |||
43 | #include <asm/system.h> | ||
44 | #include <asm/uaccess.h> | ||
45 | #include <asm/prom.h> | ||
46 | #include <asm/firmware.h> | ||
47 | #include <asm/iseries/hv_types.h> | ||
48 | #include <asm/iseries/hv_lp_event.h> | ||
49 | #include <asm/iseries/hv_lp_config.h> | ||
50 | #include <asm/iseries/mf.h> | ||
51 | #include <asm/iseries/vio.h> | ||
52 | |||
53 | /* Status of the path to each other partition in the system. | ||
54 | * This is overkill, since we will only ever establish connections | ||
55 | * to our hosting partition and the primary partition on the system. | ||
56 | * But this allows for other support in the future. | ||
57 | */ | ||
58 | static struct viopathStatus { | ||
59 | int isOpen; /* Did we open the path? */ | ||
60 | int isActive; /* Do we have a mon msg outstanding */ | ||
61 | int users[VIO_MAX_SUBTYPES]; | ||
62 | HvLpInstanceId mSourceInst; | ||
63 | HvLpInstanceId mTargetInst; | ||
64 | int numberAllocated; | ||
65 | } viopathStatus[HVMAXARCHITECTEDLPS]; | ||
66 | |||
67 | static DEFINE_SPINLOCK(statuslock); | ||
68 | |||
69 | /* | ||
70 | * For each kind of event we allocate a buffer that is | ||
71 | * guaranteed not to cross a page boundary | ||
72 | */ | ||
73 | static unsigned char event_buffer[VIO_MAX_SUBTYPES * 256] | ||
74 | __attribute__((__aligned__(4096))); | ||
75 | static atomic_t event_buffer_available[VIO_MAX_SUBTYPES]; | ||
76 | static int event_buffer_initialised; | ||
77 | |||
78 | static void handleMonitorEvent(struct HvLpEvent *event); | ||
79 | |||
80 | /* | ||
81 | * We use this structure to handle asynchronous responses. The caller | ||
82 | * blocks on the semaphore and the handler posts the semaphore. However, | ||
83 | * if system_state is not SYSTEM_RUNNING, then wait_atomic is used ... | ||
84 | */ | ||
85 | struct alloc_parms { | ||
86 | struct completion done; | ||
87 | int number; | ||
88 | atomic_t wait_atomic; | ||
89 | int used_wait_atomic; | ||
90 | }; | ||
91 | |||
92 | /* Put a sequence number in each mon msg. The value is not | ||
93 | * important. Start at something other than 0 just for | ||
94 | * readability. wrapping this is ok. | ||
95 | */ | ||
96 | static u8 viomonseq = 22; | ||
97 | |||
98 | /* Our hosting logical partition. We get this at startup | ||
99 | * time, and different modules access this variable directly. | ||
100 | */ | ||
101 | HvLpIndex viopath_hostLp = HvLpIndexInvalid; | ||
102 | EXPORT_SYMBOL(viopath_hostLp); | ||
103 | HvLpIndex viopath_ourLp = HvLpIndexInvalid; | ||
104 | EXPORT_SYMBOL(viopath_ourLp); | ||
105 | |||
106 | /* For each kind of incoming event we set a pointer to a | ||
107 | * routine to call. | ||
108 | */ | ||
109 | static vio_event_handler_t *vio_handler[VIO_MAX_SUBTYPES]; | ||
110 | |||
111 | #define VIOPATH_KERN_WARN KERN_WARNING "viopath: " | ||
112 | #define VIOPATH_KERN_INFO KERN_INFO "viopath: " | ||
113 | |||
114 | static int proc_viopath_show(struct seq_file *m, void *v) | ||
115 | { | ||
116 | char *buf; | ||
117 | u16 vlanMap; | ||
118 | dma_addr_t handle; | ||
119 | HvLpEvent_Rc hvrc; | ||
120 | DECLARE_COMPLETION_ONSTACK(done); | ||
121 | struct device_node *node; | ||
122 | const char *sysid; | ||
123 | |||
124 | buf = kzalloc(HW_PAGE_SIZE, GFP_KERNEL); | ||
125 | if (!buf) | ||
126 | return 0; | ||
127 | |||
128 | handle = iseries_hv_map(buf, HW_PAGE_SIZE, DMA_FROM_DEVICE); | ||
129 | |||
130 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | ||
131 | HvLpEvent_Type_VirtualIo, | ||
132 | viomajorsubtype_config | vioconfigget, | ||
133 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | ||
134 | viopath_sourceinst(viopath_hostLp), | ||
135 | viopath_targetinst(viopath_hostLp), | ||
136 | (u64)(unsigned long)&done, VIOVERSION << 16, | ||
137 | ((u64)handle) << 32, HW_PAGE_SIZE, 0, 0); | ||
138 | |||
139 | if (hvrc != HvLpEvent_Rc_Good) | ||
140 | printk(VIOPATH_KERN_WARN "hv error on op %d\n", (int)hvrc); | ||
141 | |||
142 | wait_for_completion(&done); | ||
143 | |||
144 | vlanMap = HvLpConfig_getVirtualLanIndexMap(); | ||
145 | |||
146 | buf[HW_PAGE_SIZE-1] = '\0'; | ||
147 | seq_printf(m, "%s", buf); | ||
148 | |||
149 | iseries_hv_unmap(handle, HW_PAGE_SIZE, DMA_FROM_DEVICE); | ||
150 | kfree(buf); | ||
151 | |||
152 | seq_printf(m, "AVAILABLE_VETH=%x\n", vlanMap); | ||
153 | |||
154 | node = of_find_node_by_path("/"); | ||
155 | sysid = NULL; | ||
156 | if (node != NULL) | ||
157 | sysid = of_get_property(node, "system-id", NULL); | ||
158 | |||
159 | if (sysid == NULL) | ||
160 | seq_printf(m, "SRLNBR=<UNKNOWN>\n"); | ||
161 | else | ||
162 | /* Skip "IBM," on front of serial number, see dt.c */ | ||
163 | seq_printf(m, "SRLNBR=%s\n", sysid + 4); | ||
164 | |||
165 | of_node_put(node); | ||
166 | |||
167 | return 0; | ||
168 | } | ||
169 | |||
170 | static int proc_viopath_open(struct inode *inode, struct file *file) | ||
171 | { | ||
172 | return single_open(file, proc_viopath_show, NULL); | ||
173 | } | ||
174 | |||
175 | static const struct file_operations proc_viopath_operations = { | ||
176 | .open = proc_viopath_open, | ||
177 | .read = seq_read, | ||
178 | .llseek = seq_lseek, | ||
179 | .release = single_release, | ||
180 | }; | ||
181 | |||
182 | static int __init vio_proc_init(void) | ||
183 | { | ||
184 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) | ||
185 | return 0; | ||
186 | |||
187 | proc_create("iSeries/config", 0, NULL, &proc_viopath_operations); | ||
188 | return 0; | ||
189 | } | ||
190 | __initcall(vio_proc_init); | ||
191 | |||
192 | /* See if a given LP is active. Allow for invalid lps to be passed in | ||
193 | * and just return invalid | ||
194 | */ | ||
195 | int viopath_isactive(HvLpIndex lp) | ||
196 | { | ||
197 | if (lp == HvLpIndexInvalid) | ||
198 | return 0; | ||
199 | if (lp < HVMAXARCHITECTEDLPS) | ||
200 | return viopathStatus[lp].isActive; | ||
201 | else | ||
202 | return 0; | ||
203 | } | ||
204 | EXPORT_SYMBOL(viopath_isactive); | ||
205 | |||
206 | /* | ||
207 | * We cache the source and target instance ids for each | ||
208 | * partition. | ||
209 | */ | ||
210 | HvLpInstanceId viopath_sourceinst(HvLpIndex lp) | ||
211 | { | ||
212 | return viopathStatus[lp].mSourceInst; | ||
213 | } | ||
214 | EXPORT_SYMBOL(viopath_sourceinst); | ||
215 | |||
216 | HvLpInstanceId viopath_targetinst(HvLpIndex lp) | ||
217 | { | ||
218 | return viopathStatus[lp].mTargetInst; | ||
219 | } | ||
220 | EXPORT_SYMBOL(viopath_targetinst); | ||
221 | |||
222 | /* | ||
223 | * Send a monitor message. This is a message with the acknowledge | ||
224 | * bit on that the other side will NOT explicitly acknowledge. When | ||
225 | * the other side goes down, the hypervisor will acknowledge any | ||
226 | * outstanding messages....so we will know when the other side dies. | ||
227 | */ | ||
228 | static void sendMonMsg(HvLpIndex remoteLp) | ||
229 | { | ||
230 | HvLpEvent_Rc hvrc; | ||
231 | |||
232 | viopathStatus[remoteLp].mSourceInst = | ||
233 | HvCallEvent_getSourceLpInstanceId(remoteLp, | ||
234 | HvLpEvent_Type_VirtualIo); | ||
235 | viopathStatus[remoteLp].mTargetInst = | ||
236 | HvCallEvent_getTargetLpInstanceId(remoteLp, | ||
237 | HvLpEvent_Type_VirtualIo); | ||
238 | |||
239 | /* | ||
240 | * Deliberately ignore the return code here. if we call this | ||
241 | * more than once, we don't care. | ||
242 | */ | ||
243 | vio_setHandler(viomajorsubtype_monitor, handleMonitorEvent); | ||
244 | |||
245 | hvrc = HvCallEvent_signalLpEventFast(remoteLp, HvLpEvent_Type_VirtualIo, | ||
246 | viomajorsubtype_monitor, HvLpEvent_AckInd_DoAck, | ||
247 | HvLpEvent_AckType_DeferredAck, | ||
248 | viopathStatus[remoteLp].mSourceInst, | ||
249 | viopathStatus[remoteLp].mTargetInst, | ||
250 | viomonseq++, 0, 0, 0, 0, 0); | ||
251 | |||
252 | if (hvrc == HvLpEvent_Rc_Good) | ||
253 | viopathStatus[remoteLp].isActive = 1; | ||
254 | else { | ||
255 | printk(VIOPATH_KERN_WARN "could not connect to partition %d\n", | ||
256 | remoteLp); | ||
257 | viopathStatus[remoteLp].isActive = 0; | ||
258 | } | ||
259 | } | ||
260 | |||
261 | static void handleMonitorEvent(struct HvLpEvent *event) | ||
262 | { | ||
263 | HvLpIndex remoteLp; | ||
264 | int i; | ||
265 | |||
266 | /* | ||
267 | * This handler is _also_ called as part of the loop | ||
268 | * at the end of this routine, so it must be able to | ||
269 | * ignore NULL events... | ||
270 | */ | ||
271 | if (!event) | ||
272 | return; | ||
273 | |||
274 | /* | ||
275 | * First see if this is just a normal monitor message from the | ||
276 | * other partition | ||
277 | */ | ||
278 | if (hvlpevent_is_int(event)) { | ||
279 | remoteLp = event->xSourceLp; | ||
280 | if (!viopathStatus[remoteLp].isActive) | ||
281 | sendMonMsg(remoteLp); | ||
282 | return; | ||
283 | } | ||
284 | |||
285 | /* | ||
286 | * This path is for an acknowledgement; the other partition | ||
287 | * died | ||
288 | */ | ||
289 | remoteLp = event->xTargetLp; | ||
290 | if ((event->xSourceInstanceId != viopathStatus[remoteLp].mSourceInst) || | ||
291 | (event->xTargetInstanceId != viopathStatus[remoteLp].mTargetInst)) { | ||
292 | printk(VIOPATH_KERN_WARN "ignoring ack....mismatched instances\n"); | ||
293 | return; | ||
294 | } | ||
295 | |||
296 | printk(VIOPATH_KERN_WARN "partition %d ended\n", remoteLp); | ||
297 | |||
298 | viopathStatus[remoteLp].isActive = 0; | ||
299 | |||
300 | /* | ||
301 | * For each active handler, pass them a NULL | ||
302 | * message to indicate that the other partition | ||
303 | * died | ||
304 | */ | ||
305 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) { | ||
306 | if (vio_handler[i] != NULL) | ||
307 | (*vio_handler[i])(NULL); | ||
308 | } | ||
309 | } | ||
310 | |||
311 | int vio_setHandler(int subtype, vio_event_handler_t *beh) | ||
312 | { | ||
313 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | ||
314 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | ||
315 | return -EINVAL; | ||
316 | if (vio_handler[subtype] != NULL) | ||
317 | return -EBUSY; | ||
318 | vio_handler[subtype] = beh; | ||
319 | return 0; | ||
320 | } | ||
321 | EXPORT_SYMBOL(vio_setHandler); | ||
322 | |||
323 | int vio_clearHandler(int subtype) | ||
324 | { | ||
325 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | ||
326 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | ||
327 | return -EINVAL; | ||
328 | if (vio_handler[subtype] == NULL) | ||
329 | return -EAGAIN; | ||
330 | vio_handler[subtype] = NULL; | ||
331 | return 0; | ||
332 | } | ||
333 | EXPORT_SYMBOL(vio_clearHandler); | ||
334 | |||
335 | static void handleConfig(struct HvLpEvent *event) | ||
336 | { | ||
337 | if (!event) | ||
338 | return; | ||
339 | if (hvlpevent_is_int(event)) { | ||
340 | printk(VIOPATH_KERN_WARN | ||
341 | "unexpected config request from partition %d", | ||
342 | event->xSourceLp); | ||
343 | |||
344 | if (hvlpevent_need_ack(event)) { | ||
345 | event->xRc = HvLpEvent_Rc_InvalidSubtype; | ||
346 | HvCallEvent_ackLpEvent(event); | ||
347 | } | ||
348 | return; | ||
349 | } | ||
350 | |||
351 | complete((struct completion *)event->xCorrelationToken); | ||
352 | } | ||
353 | |||
354 | /* | ||
355 | * Initialization of the hosting partition | ||
356 | */ | ||
357 | void vio_set_hostlp(void) | ||
358 | { | ||
359 | /* | ||
360 | * If this has already been set then we DON'T want to either change | ||
361 | * it or re-register the proc file system | ||
362 | */ | ||
363 | if (viopath_hostLp != HvLpIndexInvalid) | ||
364 | return; | ||
365 | |||
366 | /* | ||
367 | * Figure out our hosting partition. This isn't allowed to change | ||
368 | * while we're active | ||
369 | */ | ||
370 | viopath_ourLp = HvLpConfig_getLpIndex(); | ||
371 | viopath_hostLp = HvLpConfig_getHostingLpIndex(viopath_ourLp); | ||
372 | |||
373 | if (viopath_hostLp != HvLpIndexInvalid) | ||
374 | vio_setHandler(viomajorsubtype_config, handleConfig); | ||
375 | } | ||
376 | EXPORT_SYMBOL(vio_set_hostlp); | ||
377 | |||
378 | static void vio_handleEvent(struct HvLpEvent *event) | ||
379 | { | ||
380 | HvLpIndex remoteLp; | ||
381 | int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK) | ||
382 | >> VIOMAJOR_SUBTYPE_SHIFT; | ||
383 | |||
384 | if (hvlpevent_is_int(event)) { | ||
385 | remoteLp = event->xSourceLp; | ||
386 | /* | ||
387 | * The isActive is checked because if the hosting partition | ||
388 | * went down and came back up it would not be active but it | ||
389 | * would have different source and target instances, in which | ||
390 | * case we'd want to reset them. This case really protects | ||
391 | * against an unauthorized active partition sending interrupts | ||
392 | * or acks to this linux partition. | ||
393 | */ | ||
394 | if (viopathStatus[remoteLp].isActive | ||
395 | && (event->xSourceInstanceId != | ||
396 | viopathStatus[remoteLp].mTargetInst)) { | ||
397 | printk(VIOPATH_KERN_WARN | ||
398 | "message from invalid partition. " | ||
399 | "int msg rcvd, source inst (%d) doesn't match (%d)\n", | ||
400 | viopathStatus[remoteLp].mTargetInst, | ||
401 | event->xSourceInstanceId); | ||
402 | return; | ||
403 | } | ||
404 | |||
405 | if (viopathStatus[remoteLp].isActive | ||
406 | && (event->xTargetInstanceId != | ||
407 | viopathStatus[remoteLp].mSourceInst)) { | ||
408 | printk(VIOPATH_KERN_WARN | ||
409 | "message from invalid partition. " | ||
410 | "int msg rcvd, target inst (%d) doesn't match (%d)\n", | ||
411 | viopathStatus[remoteLp].mSourceInst, | ||
412 | event->xTargetInstanceId); | ||
413 | return; | ||
414 | } | ||
415 | } else { | ||
416 | remoteLp = event->xTargetLp; | ||
417 | if (event->xSourceInstanceId != | ||
418 | viopathStatus[remoteLp].mSourceInst) { | ||
419 | printk(VIOPATH_KERN_WARN | ||
420 | "message from invalid partition. " | ||
421 | "ack msg rcvd, source inst (%d) doesn't match (%d)\n", | ||
422 | viopathStatus[remoteLp].mSourceInst, | ||
423 | event->xSourceInstanceId); | ||
424 | return; | ||
425 | } | ||
426 | |||
427 | if (event->xTargetInstanceId != | ||
428 | viopathStatus[remoteLp].mTargetInst) { | ||
429 | printk(VIOPATH_KERN_WARN | ||
430 | "message from invalid partition. " | ||
431 | "viopath: ack msg rcvd, target inst (%d) doesn't match (%d)\n", | ||
432 | viopathStatus[remoteLp].mTargetInst, | ||
433 | event->xTargetInstanceId); | ||
434 | return; | ||
435 | } | ||
436 | } | ||
437 | |||
438 | if (vio_handler[subtype] == NULL) { | ||
439 | printk(VIOPATH_KERN_WARN | ||
440 | "unexpected virtual io event subtype %d from partition %d\n", | ||
441 | event->xSubtype, remoteLp); | ||
442 | /* No handler. Ack if necessary */ | ||
443 | if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { | ||
444 | event->xRc = HvLpEvent_Rc_InvalidSubtype; | ||
445 | HvCallEvent_ackLpEvent(event); | ||
446 | } | ||
447 | return; | ||
448 | } | ||
449 | |||
450 | /* This innocuous little line is where all the real work happens */ | ||
451 | (*vio_handler[subtype])(event); | ||
452 | } | ||
453 | |||
454 | static void viopath_donealloc(void *parm, int number) | ||
455 | { | ||
456 | struct alloc_parms *parmsp = parm; | ||
457 | |||
458 | parmsp->number = number; | ||
459 | if (parmsp->used_wait_atomic) | ||
460 | atomic_set(&parmsp->wait_atomic, 0); | ||
461 | else | ||
462 | complete(&parmsp->done); | ||
463 | } | ||
464 | |||
465 | static int allocateEvents(HvLpIndex remoteLp, int numEvents) | ||
466 | { | ||
467 | struct alloc_parms parms; | ||
468 | |||
469 | if (system_state != SYSTEM_RUNNING) { | ||
470 | parms.used_wait_atomic = 1; | ||
471 | atomic_set(&parms.wait_atomic, 1); | ||
472 | } else { | ||
473 | parms.used_wait_atomic = 0; | ||
474 | init_completion(&parms.done); | ||
475 | } | ||
476 | mf_allocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, 250, /* It would be nice to put a real number here! */ | ||
477 | numEvents, &viopath_donealloc, &parms); | ||
478 | if (system_state != SYSTEM_RUNNING) { | ||
479 | while (atomic_read(&parms.wait_atomic)) | ||
480 | mb(); | ||
481 | } else | ||
482 | wait_for_completion(&parms.done); | ||
483 | return parms.number; | ||
484 | } | ||
485 | |||
486 | int viopath_open(HvLpIndex remoteLp, int subtype, int numReq) | ||
487 | { | ||
488 | int i; | ||
489 | unsigned long flags; | ||
490 | int tempNumAllocated; | ||
491 | |||
492 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) | ||
493 | return -EINVAL; | ||
494 | |||
495 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | ||
496 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | ||
497 | return -EINVAL; | ||
498 | |||
499 | spin_lock_irqsave(&statuslock, flags); | ||
500 | |||
501 | if (!event_buffer_initialised) { | ||
502 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) | ||
503 | atomic_set(&event_buffer_available[i], 1); | ||
504 | event_buffer_initialised = 1; | ||
505 | } | ||
506 | |||
507 | viopathStatus[remoteLp].users[subtype]++; | ||
508 | |||
509 | if (!viopathStatus[remoteLp].isOpen) { | ||
510 | viopathStatus[remoteLp].isOpen = 1; | ||
511 | HvCallEvent_openLpEventPath(remoteLp, HvLpEvent_Type_VirtualIo); | ||
512 | |||
513 | /* | ||
514 | * Don't hold the spinlock during an operation that | ||
515 | * can sleep. | ||
516 | */ | ||
517 | spin_unlock_irqrestore(&statuslock, flags); | ||
518 | tempNumAllocated = allocateEvents(remoteLp, 1); | ||
519 | spin_lock_irqsave(&statuslock, flags); | ||
520 | |||
521 | viopathStatus[remoteLp].numberAllocated += tempNumAllocated; | ||
522 | |||
523 | if (viopathStatus[remoteLp].numberAllocated == 0) { | ||
524 | HvCallEvent_closeLpEventPath(remoteLp, | ||
525 | HvLpEvent_Type_VirtualIo); | ||
526 | |||
527 | spin_unlock_irqrestore(&statuslock, flags); | ||
528 | return -ENOMEM; | ||
529 | } | ||
530 | |||
531 | viopathStatus[remoteLp].mSourceInst = | ||
532 | HvCallEvent_getSourceLpInstanceId(remoteLp, | ||
533 | HvLpEvent_Type_VirtualIo); | ||
534 | viopathStatus[remoteLp].mTargetInst = | ||
535 | HvCallEvent_getTargetLpInstanceId(remoteLp, | ||
536 | HvLpEvent_Type_VirtualIo); | ||
537 | HvLpEvent_registerHandler(HvLpEvent_Type_VirtualIo, | ||
538 | &vio_handleEvent); | ||
539 | sendMonMsg(remoteLp); | ||
540 | printk(VIOPATH_KERN_INFO "opening connection to partition %d, " | ||
541 | "setting sinst %d, tinst %d\n", | ||
542 | remoteLp, viopathStatus[remoteLp].mSourceInst, | ||
543 | viopathStatus[remoteLp].mTargetInst); | ||
544 | } | ||
545 | |||
546 | spin_unlock_irqrestore(&statuslock, flags); | ||
547 | tempNumAllocated = allocateEvents(remoteLp, numReq); | ||
548 | spin_lock_irqsave(&statuslock, flags); | ||
549 | viopathStatus[remoteLp].numberAllocated += tempNumAllocated; | ||
550 | spin_unlock_irqrestore(&statuslock, flags); | ||
551 | |||
552 | return 0; | ||
553 | } | ||
554 | EXPORT_SYMBOL(viopath_open); | ||
555 | |||
556 | int viopath_close(HvLpIndex remoteLp, int subtype, int numReq) | ||
557 | { | ||
558 | unsigned long flags; | ||
559 | int i; | ||
560 | int numOpen; | ||
561 | struct alloc_parms parms; | ||
562 | |||
563 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) | ||
564 | return -EINVAL; | ||
565 | |||
566 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | ||
567 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | ||
568 | return -EINVAL; | ||
569 | |||
570 | spin_lock_irqsave(&statuslock, flags); | ||
571 | /* | ||
572 | * If the viopath_close somehow gets called before a | ||
573 | * viopath_open it could decrement to -1 which is a non | ||
574 | * recoverable state so we'll prevent this from | ||
575 | * happening. | ||
576 | */ | ||
577 | if (viopathStatus[remoteLp].users[subtype] > 0) | ||
578 | viopathStatus[remoteLp].users[subtype]--; | ||
579 | |||
580 | spin_unlock_irqrestore(&statuslock, flags); | ||
581 | |||
582 | parms.used_wait_atomic = 0; | ||
583 | init_completion(&parms.done); | ||
584 | mf_deallocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, | ||
585 | numReq, &viopath_donealloc, &parms); | ||
586 | wait_for_completion(&parms.done); | ||
587 | |||
588 | spin_lock_irqsave(&statuslock, flags); | ||
589 | for (i = 0, numOpen = 0; i < VIO_MAX_SUBTYPES; i++) | ||
590 | numOpen += viopathStatus[remoteLp].users[i]; | ||
591 | |||
592 | if ((viopathStatus[remoteLp].isOpen) && (numOpen == 0)) { | ||
593 | printk(VIOPATH_KERN_INFO "closing connection to partition %d\n", | ||
594 | remoteLp); | ||
595 | |||
596 | HvCallEvent_closeLpEventPath(remoteLp, | ||
597 | HvLpEvent_Type_VirtualIo); | ||
598 | viopathStatus[remoteLp].isOpen = 0; | ||
599 | viopathStatus[remoteLp].isActive = 0; | ||
600 | |||
601 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) | ||
602 | atomic_set(&event_buffer_available[i], 0); | ||
603 | event_buffer_initialised = 0; | ||
604 | } | ||
605 | spin_unlock_irqrestore(&statuslock, flags); | ||
606 | return 0; | ||
607 | } | ||
608 | EXPORT_SYMBOL(viopath_close); | ||
609 | |||
610 | void *vio_get_event_buffer(int subtype) | ||
611 | { | ||
612 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | ||
613 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | ||
614 | return NULL; | ||
615 | |||
616 | if (atomic_dec_if_positive(&event_buffer_available[subtype]) == 0) | ||
617 | return &event_buffer[subtype * 256]; | ||
618 | else | ||
619 | return NULL; | ||
620 | } | ||
621 | EXPORT_SYMBOL(vio_get_event_buffer); | ||
622 | |||
623 | void vio_free_event_buffer(int subtype, void *buffer) | ||
624 | { | ||
625 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | ||
626 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) { | ||
627 | printk(VIOPATH_KERN_WARN | ||
628 | "unexpected subtype %d freeing event buffer\n", subtype); | ||
629 | return; | ||
630 | } | ||
631 | |||
632 | if (atomic_read(&event_buffer_available[subtype]) != 0) { | ||
633 | printk(VIOPATH_KERN_WARN | ||
634 | "freeing unallocated event buffer, subtype %d\n", | ||
635 | subtype); | ||
636 | return; | ||
637 | } | ||
638 | |||
639 | if (buffer != &event_buffer[subtype * 256]) { | ||
640 | printk(VIOPATH_KERN_WARN | ||
641 | "freeing invalid event buffer, subtype %d\n", subtype); | ||
642 | } | ||
643 | |||
644 | atomic_set(&event_buffer_available[subtype], 1); | ||
645 | } | ||
646 | EXPORT_SYMBOL(vio_free_event_buffer); | ||
647 | |||
648 | static const struct vio_error_entry vio_no_error = | ||
649 | { 0, 0, "Non-VIO Error" }; | ||
650 | static const struct vio_error_entry vio_unknown_error = | ||
651 | { 0, EIO, "Unknown Error" }; | ||
652 | |||
653 | static const struct vio_error_entry vio_default_errors[] = { | ||
654 | {0x0001, EIO, "No Connection"}, | ||
655 | {0x0002, EIO, "No Receiver"}, | ||
656 | {0x0003, EIO, "No Buffer Available"}, | ||
657 | {0x0004, EBADRQC, "Invalid Message Type"}, | ||
658 | {0x0000, 0, NULL}, | ||
659 | }; | ||
660 | |||
661 | const struct vio_error_entry *vio_lookup_rc( | ||
662 | const struct vio_error_entry *local_table, u16 rc) | ||
663 | { | ||
664 | const struct vio_error_entry *cur; | ||
665 | |||
666 | if (!rc) | ||
667 | return &vio_no_error; | ||
668 | if (local_table) | ||
669 | for (cur = local_table; cur->rc; ++cur) | ||
670 | if (cur->rc == rc) | ||
671 | return cur; | ||
672 | for (cur = vio_default_errors; cur->rc; ++cur) | ||
673 | if (cur->rc == rc) | ||
674 | return cur; | ||
675 | return &vio_unknown_error; | ||
676 | } | ||
677 | EXPORT_SYMBOL(vio_lookup_rc); | ||