]>
Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* -*- linux-c -*- |
1da177e4 LT |
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 | * | |
d223e721 | 9 | * (C) Copyright 2000-2005 IBM Corporation |
1da177e4 LT |
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/errno.h> | |
33 | #include <linux/vmalloc.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/proc_fs.h> | |
36 | #include <linux/dma-mapping.h> | |
37 | #include <linux/wait.h> | |
38 | #include <linux/seq_file.h> | |
39 | #include <linux/smp_lock.h> | |
40 | #include <linux/interrupt.h> | |
41 | ||
42 | #include <asm/system.h> | |
43 | #include <asm/uaccess.h> | |
a749690e | 44 | #include <asm/prom.h> |
e9966ff8 | 45 | #include <asm/firmware.h> |
1ec65d76 | 46 | #include <asm/iseries/hv_types.h> |
e45423ea | 47 | #include <asm/iseries/hv_lp_event.h> |
15b17189 | 48 | #include <asm/iseries/hv_lp_config.h> |
bbc8b628 | 49 | #include <asm/iseries/mf.h> |
b4206778 | 50 | #include <asm/iseries/vio.h> |
1da177e4 LT |
51 | |
52 | /* Status of the path to each other partition in the system. | |
53 | * This is overkill, since we will only ever establish connections | |
54 | * to our hosting partition and the primary partition on the system. | |
55 | * But this allows for other support in the future. | |
56 | */ | |
57 | static struct viopathStatus { | |
58 | int isOpen; /* Did we open the path? */ | |
59 | int isActive; /* Do we have a mon msg outstanding */ | |
60 | int users[VIO_MAX_SUBTYPES]; | |
61 | HvLpInstanceId mSourceInst; | |
62 | HvLpInstanceId mTargetInst; | |
63 | int numberAllocated; | |
64 | } viopathStatus[HVMAXARCHITECTEDLPS]; | |
65 | ||
66 | static DEFINE_SPINLOCK(statuslock); | |
67 | ||
68 | /* | |
69 | * For each kind of event we allocate a buffer that is | |
70 | * guaranteed not to cross a page boundary | |
71 | */ | |
3c726f8d BH |
72 | static unsigned char event_buffer[VIO_MAX_SUBTYPES * 256] |
73 | __attribute__((__aligned__(4096))); | |
1da177e4 LT |
74 | static atomic_t event_buffer_available[VIO_MAX_SUBTYPES]; |
75 | static int event_buffer_initialised; | |
76 | ||
77 | static void handleMonitorEvent(struct HvLpEvent *event); | |
78 | ||
79 | /* | |
80 | * We use this structure to handle asynchronous responses. The caller | |
81 | * blocks on the semaphore and the handler posts the semaphore. However, | |
82 | * if system_state is not SYSTEM_RUNNING, then wait_atomic is used ... | |
83 | */ | |
84 | struct alloc_parms { | |
85 | struct semaphore sem; | |
86 | int number; | |
87 | atomic_t wait_atomic; | |
88 | int used_wait_atomic; | |
89 | }; | |
90 | ||
91 | /* Put a sequence number in each mon msg. The value is not | |
92 | * important. Start at something other than 0 just for | |
93 | * readability. wrapping this is ok. | |
94 | */ | |
95 | static u8 viomonseq = 22; | |
96 | ||
97 | /* Our hosting logical partition. We get this at startup | |
98 | * time, and different modules access this variable directly. | |
99 | */ | |
100 | HvLpIndex viopath_hostLp = HvLpIndexInvalid; | |
101 | EXPORT_SYMBOL(viopath_hostLp); | |
102 | HvLpIndex viopath_ourLp = HvLpIndexInvalid; | |
103 | EXPORT_SYMBOL(viopath_ourLp); | |
104 | ||
105 | /* For each kind of incoming event we set a pointer to a | |
106 | * routine to call. | |
107 | */ | |
108 | static vio_event_handler_t *vio_handler[VIO_MAX_SUBTYPES]; | |
109 | ||
110 | #define VIOPATH_KERN_WARN KERN_WARNING "viopath: " | |
111 | #define VIOPATH_KERN_INFO KERN_INFO "viopath: " | |
112 | ||
113 | static int proc_viopath_show(struct seq_file *m, void *v) | |
114 | { | |
115 | char *buf; | |
116 | u16 vlanMap; | |
117 | dma_addr_t handle; | |
118 | HvLpEvent_Rc hvrc; | |
119 | DECLARE_MUTEX_LOCKED(Semaphore); | |
a749690e | 120 | struct device_node *node; |
a0a428e3 | 121 | const char *sysid; |
1da177e4 | 122 | |
f8485350 | 123 | buf = kzalloc(HW_PAGE_SIZE, GFP_KERNEL); |
1da177e4 LT |
124 | if (!buf) |
125 | return 0; | |
1da177e4 | 126 | |
3c726f8d | 127 | handle = dma_map_single(iSeries_vio_dev, buf, HW_PAGE_SIZE, |
1da177e4 LT |
128 | 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)&Semaphore, VIOVERSION << 16, | |
3c726f8d | 137 | ((u64)handle) << 32, HW_PAGE_SIZE, 0, 0); |
1da177e4 LT |
138 | |
139 | if (hvrc != HvLpEvent_Rc_Good) | |
140 | printk(VIOPATH_KERN_WARN "hv error on op %d\n", (int)hvrc); | |
141 | ||
142 | down(&Semaphore); | |
143 | ||
144 | vlanMap = HvLpConfig_getVirtualLanIndexMap(); | |
145 | ||
3c726f8d | 146 | buf[HW_PAGE_SIZE-1] = '\0'; |
1da177e4 | 147 | seq_printf(m, "%s", buf); |
1da177e4 | 148 | |
3c726f8d BH |
149 | dma_unmap_single(iSeries_vio_dev, handle, HW_PAGE_SIZE, |
150 | DMA_FROM_DEVICE); | |
1da177e4 LT |
151 | kfree(buf); |
152 | ||
a749690e ME |
153 | seq_printf(m, "AVAILABLE_VETH=%x\n", vlanMap); |
154 | ||
155 | node = of_find_node_by_path("/"); | |
a0a428e3 | 156 | sysid = NULL; |
a749690e | 157 | if (node != NULL) |
a0a428e3 | 158 | sysid = get_property(node, "system-id", NULL); |
a749690e | 159 | |
a0a428e3 | 160 | if (sysid == NULL) |
a749690e ME |
161 | seq_printf(m, "SRLNBR=<UNKNOWN>\n"); |
162 | else | |
163 | /* Skip "IBM," on front of serial number, see dt.c */ | |
a0a428e3 | 164 | seq_printf(m, "SRLNBR=%s\n", sysid + 4); |
a749690e ME |
165 | |
166 | of_node_put(node); | |
167 | ||
1da177e4 LT |
168 | return 0; |
169 | } | |
170 | ||
171 | static int proc_viopath_open(struct inode *inode, struct file *file) | |
172 | { | |
173 | return single_open(file, proc_viopath_show, NULL); | |
174 | } | |
175 | ||
5dfe4c96 | 176 | static const struct file_operations proc_viopath_operations = { |
1da177e4 LT |
177 | .open = proc_viopath_open, |
178 | .read = seq_read, | |
179 | .llseek = seq_lseek, | |
180 | .release = single_release, | |
181 | }; | |
182 | ||
183 | static int __init vio_proc_init(void) | |
184 | { | |
185 | struct proc_dir_entry *e; | |
186 | ||
e9966ff8 SR |
187 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
188 | return 0; | |
189 | ||
1da177e4 LT |
190 | e = create_proc_entry("iSeries/config", 0, NULL); |
191 | if (e) | |
192 | e->proc_fops = &proc_viopath_operations; | |
193 | ||
194 | return 0; | |
195 | } | |
196 | __initcall(vio_proc_init); | |
197 | ||
198 | /* See if a given LP is active. Allow for invalid lps to be passed in | |
199 | * and just return invalid | |
200 | */ | |
201 | int viopath_isactive(HvLpIndex lp) | |
202 | { | |
203 | if (lp == HvLpIndexInvalid) | |
204 | return 0; | |
205 | if (lp < HVMAXARCHITECTEDLPS) | |
206 | return viopathStatus[lp].isActive; | |
207 | else | |
208 | return 0; | |
209 | } | |
210 | EXPORT_SYMBOL(viopath_isactive); | |
211 | ||
212 | /* | |
213 | * We cache the source and target instance ids for each | |
214 | * partition. | |
215 | */ | |
216 | HvLpInstanceId viopath_sourceinst(HvLpIndex lp) | |
217 | { | |
218 | return viopathStatus[lp].mSourceInst; | |
219 | } | |
220 | EXPORT_SYMBOL(viopath_sourceinst); | |
221 | ||
222 | HvLpInstanceId viopath_targetinst(HvLpIndex lp) | |
223 | { | |
224 | return viopathStatus[lp].mTargetInst; | |
225 | } | |
226 | EXPORT_SYMBOL(viopath_targetinst); | |
227 | ||
228 | /* | |
229 | * Send a monitor message. This is a message with the acknowledge | |
230 | * bit on that the other side will NOT explicitly acknowledge. When | |
231 | * the other side goes down, the hypervisor will acknowledge any | |
232 | * outstanding messages....so we will know when the other side dies. | |
233 | */ | |
234 | static void sendMonMsg(HvLpIndex remoteLp) | |
235 | { | |
236 | HvLpEvent_Rc hvrc; | |
237 | ||
238 | viopathStatus[remoteLp].mSourceInst = | |
239 | HvCallEvent_getSourceLpInstanceId(remoteLp, | |
240 | HvLpEvent_Type_VirtualIo); | |
241 | viopathStatus[remoteLp].mTargetInst = | |
242 | HvCallEvent_getTargetLpInstanceId(remoteLp, | |
243 | HvLpEvent_Type_VirtualIo); | |
244 | ||
245 | /* | |
246 | * Deliberately ignore the return code here. if we call this | |
247 | * more than once, we don't care. | |
248 | */ | |
249 | vio_setHandler(viomajorsubtype_monitor, handleMonitorEvent); | |
250 | ||
251 | hvrc = HvCallEvent_signalLpEventFast(remoteLp, HvLpEvent_Type_VirtualIo, | |
252 | viomajorsubtype_monitor, HvLpEvent_AckInd_DoAck, | |
253 | HvLpEvent_AckType_DeferredAck, | |
254 | viopathStatus[remoteLp].mSourceInst, | |
255 | viopathStatus[remoteLp].mTargetInst, | |
256 | viomonseq++, 0, 0, 0, 0, 0); | |
257 | ||
258 | if (hvrc == HvLpEvent_Rc_Good) | |
259 | viopathStatus[remoteLp].isActive = 1; | |
260 | else { | |
261 | printk(VIOPATH_KERN_WARN "could not connect to partition %d\n", | |
262 | remoteLp); | |
263 | viopathStatus[remoteLp].isActive = 0; | |
264 | } | |
265 | } | |
266 | ||
267 | static void handleMonitorEvent(struct HvLpEvent *event) | |
268 | { | |
269 | HvLpIndex remoteLp; | |
270 | int i; | |
271 | ||
272 | /* | |
273 | * This handler is _also_ called as part of the loop | |
274 | * at the end of this routine, so it must be able to | |
275 | * ignore NULL events... | |
276 | */ | |
277 | if (!event) | |
278 | return; | |
279 | ||
280 | /* | |
281 | * First see if this is just a normal monitor message from the | |
282 | * other partition | |
283 | */ | |
677f8c0d | 284 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
285 | remoteLp = event->xSourceLp; |
286 | if (!viopathStatus[remoteLp].isActive) | |
287 | sendMonMsg(remoteLp); | |
288 | return; | |
289 | } | |
290 | ||
291 | /* | |
292 | * This path is for an acknowledgement; the other partition | |
293 | * died | |
294 | */ | |
295 | remoteLp = event->xTargetLp; | |
296 | if ((event->xSourceInstanceId != viopathStatus[remoteLp].mSourceInst) || | |
297 | (event->xTargetInstanceId != viopathStatus[remoteLp].mTargetInst)) { | |
298 | printk(VIOPATH_KERN_WARN "ignoring ack....mismatched instances\n"); | |
299 | return; | |
300 | } | |
301 | ||
302 | printk(VIOPATH_KERN_WARN "partition %d ended\n", remoteLp); | |
303 | ||
304 | viopathStatus[remoteLp].isActive = 0; | |
305 | ||
306 | /* | |
307 | * For each active handler, pass them a NULL | |
308 | * message to indicate that the other partition | |
309 | * died | |
310 | */ | |
311 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) { | |
312 | if (vio_handler[i] != NULL) | |
313 | (*vio_handler[i])(NULL); | |
314 | } | |
315 | } | |
316 | ||
317 | int vio_setHandler(int subtype, vio_event_handler_t *beh) | |
318 | { | |
319 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
320 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
321 | return -EINVAL; | |
322 | if (vio_handler[subtype] != NULL) | |
323 | return -EBUSY; | |
324 | vio_handler[subtype] = beh; | |
325 | return 0; | |
326 | } | |
327 | EXPORT_SYMBOL(vio_setHandler); | |
328 | ||
329 | int vio_clearHandler(int subtype) | |
330 | { | |
331 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
332 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
333 | return -EINVAL; | |
334 | if (vio_handler[subtype] == NULL) | |
335 | return -EAGAIN; | |
336 | vio_handler[subtype] = NULL; | |
337 | return 0; | |
338 | } | |
339 | EXPORT_SYMBOL(vio_clearHandler); | |
340 | ||
341 | static void handleConfig(struct HvLpEvent *event) | |
342 | { | |
343 | if (!event) | |
344 | return; | |
677f8c0d | 345 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
346 | printk(VIOPATH_KERN_WARN |
347 | "unexpected config request from partition %d", | |
348 | event->xSourceLp); | |
349 | ||
677f8c0d | 350 | if (hvlpevent_need_ack(event)) { |
1da177e4 LT |
351 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
352 | HvCallEvent_ackLpEvent(event); | |
353 | } | |
354 | return; | |
355 | } | |
356 | ||
357 | up((struct semaphore *)event->xCorrelationToken); | |
358 | } | |
359 | ||
360 | /* | |
361 | * Initialization of the hosting partition | |
362 | */ | |
363 | void vio_set_hostlp(void) | |
364 | { | |
365 | /* | |
366 | * If this has already been set then we DON'T want to either change | |
367 | * it or re-register the proc file system | |
368 | */ | |
369 | if (viopath_hostLp != HvLpIndexInvalid) | |
370 | return; | |
371 | ||
372 | /* | |
373 | * Figure out our hosting partition. This isn't allowed to change | |
374 | * while we're active | |
375 | */ | |
376 | viopath_ourLp = HvLpConfig_getLpIndex(); | |
dd61ce92 | 377 | viopath_hostLp = HvLpConfig_getHostingLpIndex(viopath_ourLp); |
1da177e4 LT |
378 | |
379 | if (viopath_hostLp != HvLpIndexInvalid) | |
380 | vio_setHandler(viomajorsubtype_config, handleConfig); | |
381 | } | |
382 | EXPORT_SYMBOL(vio_set_hostlp); | |
383 | ||
35a84c2f | 384 | static void vio_handleEvent(struct HvLpEvent *event) |
1da177e4 LT |
385 | { |
386 | HvLpIndex remoteLp; | |
387 | int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK) | |
388 | >> VIOMAJOR_SUBTYPE_SHIFT; | |
389 | ||
677f8c0d | 390 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
391 | remoteLp = event->xSourceLp; |
392 | /* | |
393 | * The isActive is checked because if the hosting partition | |
394 | * went down and came back up it would not be active but it | |
395 | * would have different source and target instances, in which | |
396 | * case we'd want to reset them. This case really protects | |
397 | * against an unauthorized active partition sending interrupts | |
398 | * or acks to this linux partition. | |
399 | */ | |
400 | if (viopathStatus[remoteLp].isActive | |
401 | && (event->xSourceInstanceId != | |
402 | viopathStatus[remoteLp].mTargetInst)) { | |
403 | printk(VIOPATH_KERN_WARN | |
404 | "message from invalid partition. " | |
405 | "int msg rcvd, source inst (%d) doesnt match (%d)\n", | |
406 | viopathStatus[remoteLp].mTargetInst, | |
407 | event->xSourceInstanceId); | |
408 | return; | |
409 | } | |
410 | ||
411 | if (viopathStatus[remoteLp].isActive | |
412 | && (event->xTargetInstanceId != | |
413 | viopathStatus[remoteLp].mSourceInst)) { | |
414 | printk(VIOPATH_KERN_WARN | |
415 | "message from invalid partition. " | |
416 | "int msg rcvd, target inst (%d) doesnt match (%d)\n", | |
417 | viopathStatus[remoteLp].mSourceInst, | |
418 | event->xTargetInstanceId); | |
419 | return; | |
420 | } | |
421 | } else { | |
422 | remoteLp = event->xTargetLp; | |
423 | if (event->xSourceInstanceId != | |
424 | viopathStatus[remoteLp].mSourceInst) { | |
425 | printk(VIOPATH_KERN_WARN | |
426 | "message from invalid partition. " | |
427 | "ack msg rcvd, source inst (%d) doesnt match (%d)\n", | |
428 | viopathStatus[remoteLp].mSourceInst, | |
429 | event->xSourceInstanceId); | |
430 | return; | |
431 | } | |
432 | ||
433 | if (event->xTargetInstanceId != | |
434 | viopathStatus[remoteLp].mTargetInst) { | |
435 | printk(VIOPATH_KERN_WARN | |
436 | "message from invalid partition. " | |
437 | "viopath: ack msg rcvd, target inst (%d) doesnt match (%d)\n", | |
438 | viopathStatus[remoteLp].mTargetInst, | |
439 | event->xTargetInstanceId); | |
440 | return; | |
441 | } | |
442 | } | |
443 | ||
444 | if (vio_handler[subtype] == NULL) { | |
445 | printk(VIOPATH_KERN_WARN | |
446 | "unexpected virtual io event subtype %d from partition %d\n", | |
447 | event->xSubtype, remoteLp); | |
448 | /* No handler. Ack if necessary */ | |
677f8c0d | 449 | if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { |
1da177e4 LT |
450 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
451 | HvCallEvent_ackLpEvent(event); | |
452 | } | |
453 | return; | |
454 | } | |
455 | ||
456 | /* This innocuous little line is where all the real work happens */ | |
457 | (*vio_handler[subtype])(event); | |
458 | } | |
459 | ||
460 | static void viopath_donealloc(void *parm, int number) | |
461 | { | |
462 | struct alloc_parms *parmsp = parm; | |
463 | ||
464 | parmsp->number = number; | |
465 | if (parmsp->used_wait_atomic) | |
466 | atomic_set(&parmsp->wait_atomic, 0); | |
467 | else | |
468 | up(&parmsp->sem); | |
469 | } | |
470 | ||
471 | static int allocateEvents(HvLpIndex remoteLp, int numEvents) | |
472 | { | |
473 | struct alloc_parms parms; | |
474 | ||
475 | if (system_state != SYSTEM_RUNNING) { | |
476 | parms.used_wait_atomic = 1; | |
477 | atomic_set(&parms.wait_atomic, 1); | |
478 | } else { | |
479 | parms.used_wait_atomic = 0; | |
480 | init_MUTEX_LOCKED(&parms.sem); | |
481 | } | |
482 | mf_allocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, 250, /* It would be nice to put a real number here! */ | |
483 | numEvents, &viopath_donealloc, &parms); | |
484 | if (system_state != SYSTEM_RUNNING) { | |
485 | while (atomic_read(&parms.wait_atomic)) | |
486 | mb(); | |
487 | } else | |
488 | down(&parms.sem); | |
489 | return parms.number; | |
490 | } | |
491 | ||
492 | int viopath_open(HvLpIndex remoteLp, int subtype, int numReq) | |
493 | { | |
494 | int i; | |
495 | unsigned long flags; | |
496 | int tempNumAllocated; | |
497 | ||
c670b1ac | 498 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
1da177e4 LT |
499 | return -EINVAL; |
500 | ||
501 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
502 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
503 | return -EINVAL; | |
504 | ||
505 | spin_lock_irqsave(&statuslock, flags); | |
506 | ||
507 | if (!event_buffer_initialised) { | |
508 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) | |
509 | atomic_set(&event_buffer_available[i], 1); | |
510 | event_buffer_initialised = 1; | |
511 | } | |
512 | ||
513 | viopathStatus[remoteLp].users[subtype]++; | |
514 | ||
515 | if (!viopathStatus[remoteLp].isOpen) { | |
516 | viopathStatus[remoteLp].isOpen = 1; | |
517 | HvCallEvent_openLpEventPath(remoteLp, HvLpEvent_Type_VirtualIo); | |
518 | ||
519 | /* | |
520 | * Don't hold the spinlock during an operation that | |
521 | * can sleep. | |
522 | */ | |
523 | spin_unlock_irqrestore(&statuslock, flags); | |
524 | tempNumAllocated = allocateEvents(remoteLp, 1); | |
525 | spin_lock_irqsave(&statuslock, flags); | |
526 | ||
527 | viopathStatus[remoteLp].numberAllocated += tempNumAllocated; | |
528 | ||
529 | if (viopathStatus[remoteLp].numberAllocated == 0) { | |
530 | HvCallEvent_closeLpEventPath(remoteLp, | |
531 | HvLpEvent_Type_VirtualIo); | |
532 | ||
533 | spin_unlock_irqrestore(&statuslock, flags); | |
534 | return -ENOMEM; | |
535 | } | |
536 | ||
537 | viopathStatus[remoteLp].mSourceInst = | |
538 | HvCallEvent_getSourceLpInstanceId(remoteLp, | |
539 | HvLpEvent_Type_VirtualIo); | |
540 | viopathStatus[remoteLp].mTargetInst = | |
541 | HvCallEvent_getTargetLpInstanceId(remoteLp, | |
542 | HvLpEvent_Type_VirtualIo); | |
543 | HvLpEvent_registerHandler(HvLpEvent_Type_VirtualIo, | |
544 | &vio_handleEvent); | |
545 | sendMonMsg(remoteLp); | |
546 | printk(VIOPATH_KERN_INFO "opening connection to partition %d, " | |
547 | "setting sinst %d, tinst %d\n", | |
548 | remoteLp, viopathStatus[remoteLp].mSourceInst, | |
549 | viopathStatus[remoteLp].mTargetInst); | |
550 | } | |
551 | ||
552 | spin_unlock_irqrestore(&statuslock, flags); | |
553 | tempNumAllocated = allocateEvents(remoteLp, numReq); | |
554 | spin_lock_irqsave(&statuslock, flags); | |
555 | viopathStatus[remoteLp].numberAllocated += tempNumAllocated; | |
556 | spin_unlock_irqrestore(&statuslock, flags); | |
557 | ||
558 | return 0; | |
559 | } | |
560 | EXPORT_SYMBOL(viopath_open); | |
561 | ||
562 | int viopath_close(HvLpIndex remoteLp, int subtype, int numReq) | |
563 | { | |
564 | unsigned long flags; | |
565 | int i; | |
566 | int numOpen; | |
567 | struct alloc_parms parms; | |
568 | ||
c670b1ac | 569 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
1da177e4 LT |
570 | return -EINVAL; |
571 | ||
572 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
573 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
574 | return -EINVAL; | |
575 | ||
576 | spin_lock_irqsave(&statuslock, flags); | |
577 | /* | |
578 | * If the viopath_close somehow gets called before a | |
579 | * viopath_open it could decrement to -1 which is a non | |
580 | * recoverable state so we'll prevent this from | |
581 | * happening. | |
582 | */ | |
583 | if (viopathStatus[remoteLp].users[subtype] > 0) | |
584 | viopathStatus[remoteLp].users[subtype]--; | |
585 | ||
586 | spin_unlock_irqrestore(&statuslock, flags); | |
587 | ||
588 | parms.used_wait_atomic = 0; | |
589 | init_MUTEX_LOCKED(&parms.sem); | |
590 | mf_deallocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, | |
591 | numReq, &viopath_donealloc, &parms); | |
592 | down(&parms.sem); | |
593 | ||
594 | spin_lock_irqsave(&statuslock, flags); | |
595 | for (i = 0, numOpen = 0; i < VIO_MAX_SUBTYPES; i++) | |
596 | numOpen += viopathStatus[remoteLp].users[i]; | |
597 | ||
598 | if ((viopathStatus[remoteLp].isOpen) && (numOpen == 0)) { | |
599 | printk(VIOPATH_KERN_INFO "closing connection to partition %d", | |
600 | remoteLp); | |
601 | ||
602 | HvCallEvent_closeLpEventPath(remoteLp, | |
603 | HvLpEvent_Type_VirtualIo); | |
604 | viopathStatus[remoteLp].isOpen = 0; | |
605 | viopathStatus[remoteLp].isActive = 0; | |
606 | ||
607 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) | |
608 | atomic_set(&event_buffer_available[i], 0); | |
609 | event_buffer_initialised = 0; | |
610 | } | |
611 | spin_unlock_irqrestore(&statuslock, flags); | |
612 | return 0; | |
613 | } | |
614 | EXPORT_SYMBOL(viopath_close); | |
615 | ||
616 | void *vio_get_event_buffer(int subtype) | |
617 | { | |
618 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
619 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
620 | return NULL; | |
621 | ||
622 | if (atomic_dec_if_positive(&event_buffer_available[subtype]) == 0) | |
623 | return &event_buffer[subtype * 256]; | |
624 | else | |
625 | return NULL; | |
626 | } | |
627 | EXPORT_SYMBOL(vio_get_event_buffer); | |
628 | ||
629 | void vio_free_event_buffer(int subtype, void *buffer) | |
630 | { | |
631 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
632 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) { | |
633 | printk(VIOPATH_KERN_WARN | |
634 | "unexpected subtype %d freeing event buffer\n", subtype); | |
635 | return; | |
636 | } | |
637 | ||
638 | if (atomic_read(&event_buffer_available[subtype]) != 0) { | |
639 | printk(VIOPATH_KERN_WARN | |
640 | "freeing unallocated event buffer, subtype %d\n", | |
641 | subtype); | |
642 | return; | |
643 | } | |
644 | ||
645 | if (buffer != &event_buffer[subtype * 256]) { | |
646 | printk(VIOPATH_KERN_WARN | |
647 | "freeing invalid event buffer, subtype %d\n", subtype); | |
648 | } | |
649 | ||
650 | atomic_set(&event_buffer_available[subtype], 1); | |
651 | } | |
652 | EXPORT_SYMBOL(vio_free_event_buffer); | |
653 | ||
654 | static const struct vio_error_entry vio_no_error = | |
655 | { 0, 0, "Non-VIO Error" }; | |
656 | static const struct vio_error_entry vio_unknown_error = | |
657 | { 0, EIO, "Unknown Error" }; | |
658 | ||
659 | static const struct vio_error_entry vio_default_errors[] = { | |
660 | {0x0001, EIO, "No Connection"}, | |
661 | {0x0002, EIO, "No Receiver"}, | |
662 | {0x0003, EIO, "No Buffer Available"}, | |
663 | {0x0004, EBADRQC, "Invalid Message Type"}, | |
664 | {0x0000, 0, NULL}, | |
665 | }; | |
666 | ||
667 | const struct vio_error_entry *vio_lookup_rc( | |
668 | const struct vio_error_entry *local_table, u16 rc) | |
669 | { | |
670 | const struct vio_error_entry *cur; | |
671 | ||
672 | if (!rc) | |
673 | return &vio_no_error; | |
674 | if (local_table) | |
675 | for (cur = local_table; cur->rc; ++cur) | |
676 | if (cur->rc == rc) | |
677 | return cur; | |
678 | for (cur = vio_default_errors; cur->rc; ++cur) | |
679 | if (cur->rc == rc) | |
680 | return cur; | |
681 | return &vio_unknown_error; | |
682 | } | |
683 | EXPORT_SYMBOL(vio_lookup_rc); |