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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> | |
1da177e4 LT |
39 | #include <linux/interrupt.h> |
40 | ||
41 | #include <asm/system.h> | |
42 | #include <asm/uaccess.h> | |
a749690e | 43 | #include <asm/prom.h> |
e9966ff8 | 44 | #include <asm/firmware.h> |
1ec65d76 | 45 | #include <asm/iseries/hv_types.h> |
e45423ea | 46 | #include <asm/iseries/hv_lp_event.h> |
15b17189 | 47 | #include <asm/iseries/hv_lp_config.h> |
bbc8b628 | 48 | #include <asm/iseries/mf.h> |
b4206778 | 49 | #include <asm/iseries/vio.h> |
1da177e4 LT |
50 | |
51 | /* Status of the path to each other partition in the system. | |
52 | * This is overkill, since we will only ever establish connections | |
53 | * to our hosting partition and the primary partition on the system. | |
54 | * But this allows for other support in the future. | |
55 | */ | |
56 | static struct viopathStatus { | |
57 | int isOpen; /* Did we open the path? */ | |
58 | int isActive; /* Do we have a mon msg outstanding */ | |
59 | int users[VIO_MAX_SUBTYPES]; | |
60 | HvLpInstanceId mSourceInst; | |
61 | HvLpInstanceId mTargetInst; | |
62 | int numberAllocated; | |
63 | } viopathStatus[HVMAXARCHITECTEDLPS]; | |
64 | ||
65 | static DEFINE_SPINLOCK(statuslock); | |
66 | ||
67 | /* | |
68 | * For each kind of event we allocate a buffer that is | |
69 | * guaranteed not to cross a page boundary | |
70 | */ | |
3c726f8d BH |
71 | static unsigned char event_buffer[VIO_MAX_SUBTYPES * 256] |
72 | __attribute__((__aligned__(4096))); | |
1da177e4 LT |
73 | static atomic_t event_buffer_available[VIO_MAX_SUBTYPES]; |
74 | static int event_buffer_initialised; | |
75 | ||
76 | static void handleMonitorEvent(struct HvLpEvent *event); | |
77 | ||
78 | /* | |
79 | * We use this structure to handle asynchronous responses. The caller | |
80 | * blocks on the semaphore and the handler posts the semaphore. However, | |
81 | * if system_state is not SYSTEM_RUNNING, then wait_atomic is used ... | |
82 | */ | |
83 | struct alloc_parms { | |
84 | struct semaphore sem; | |
85 | int number; | |
86 | atomic_t wait_atomic; | |
87 | int used_wait_atomic; | |
88 | }; | |
89 | ||
90 | /* Put a sequence number in each mon msg. The value is not | |
91 | * important. Start at something other than 0 just for | |
92 | * readability. wrapping this is ok. | |
93 | */ | |
94 | static u8 viomonseq = 22; | |
95 | ||
96 | /* Our hosting logical partition. We get this at startup | |
97 | * time, and different modules access this variable directly. | |
98 | */ | |
99 | HvLpIndex viopath_hostLp = HvLpIndexInvalid; | |
100 | EXPORT_SYMBOL(viopath_hostLp); | |
101 | HvLpIndex viopath_ourLp = HvLpIndexInvalid; | |
102 | EXPORT_SYMBOL(viopath_ourLp); | |
103 | ||
104 | /* For each kind of incoming event we set a pointer to a | |
105 | * routine to call. | |
106 | */ | |
107 | static vio_event_handler_t *vio_handler[VIO_MAX_SUBTYPES]; | |
108 | ||
109 | #define VIOPATH_KERN_WARN KERN_WARNING "viopath: " | |
110 | #define VIOPATH_KERN_INFO KERN_INFO "viopath: " | |
111 | ||
112 | static int proc_viopath_show(struct seq_file *m, void *v) | |
113 | { | |
114 | char *buf; | |
115 | u16 vlanMap; | |
116 | dma_addr_t handle; | |
117 | HvLpEvent_Rc hvrc; | |
118 | DECLARE_MUTEX_LOCKED(Semaphore); | |
a749690e | 119 | struct device_node *node; |
a0a428e3 | 120 | const char *sysid; |
1da177e4 | 121 | |
f8485350 | 122 | buf = kzalloc(HW_PAGE_SIZE, GFP_KERNEL); |
1da177e4 LT |
123 | if (!buf) |
124 | return 0; | |
1da177e4 | 125 | |
3c726f8d | 126 | handle = dma_map_single(iSeries_vio_dev, buf, HW_PAGE_SIZE, |
1da177e4 LT |
127 | DMA_FROM_DEVICE); |
128 | ||
129 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
130 | HvLpEvent_Type_VirtualIo, | |
131 | viomajorsubtype_config | vioconfigget, | |
132 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
133 | viopath_sourceinst(viopath_hostLp), | |
134 | viopath_targetinst(viopath_hostLp), | |
135 | (u64)(unsigned long)&Semaphore, VIOVERSION << 16, | |
3c726f8d | 136 | ((u64)handle) << 32, HW_PAGE_SIZE, 0, 0); |
1da177e4 LT |
137 | |
138 | if (hvrc != HvLpEvent_Rc_Good) | |
139 | printk(VIOPATH_KERN_WARN "hv error on op %d\n", (int)hvrc); | |
140 | ||
141 | down(&Semaphore); | |
142 | ||
143 | vlanMap = HvLpConfig_getVirtualLanIndexMap(); | |
144 | ||
3c726f8d | 145 | buf[HW_PAGE_SIZE-1] = '\0'; |
1da177e4 | 146 | seq_printf(m, "%s", buf); |
1da177e4 | 147 | |
3c726f8d BH |
148 | dma_unmap_single(iSeries_vio_dev, handle, HW_PAGE_SIZE, |
149 | DMA_FROM_DEVICE); | |
1da177e4 LT |
150 | kfree(buf); |
151 | ||
a749690e ME |
152 | seq_printf(m, "AVAILABLE_VETH=%x\n", vlanMap); |
153 | ||
154 | node = of_find_node_by_path("/"); | |
a0a428e3 | 155 | sysid = NULL; |
a749690e | 156 | if (node != NULL) |
e2eb6392 | 157 | sysid = of_get_property(node, "system-id", NULL); |
a749690e | 158 | |
a0a428e3 | 159 | if (sysid == NULL) |
a749690e ME |
160 | seq_printf(m, "SRLNBR=<UNKNOWN>\n"); |
161 | else | |
162 | /* Skip "IBM," on front of serial number, see dt.c */ | |
a0a428e3 | 163 | seq_printf(m, "SRLNBR=%s\n", sysid + 4); |
a749690e ME |
164 | |
165 | of_node_put(node); | |
166 | ||
1da177e4 LT |
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 | ||
5dfe4c96 | 175 | static const struct file_operations proc_viopath_operations = { |
1da177e4 LT |
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 | struct proc_dir_entry *e; | |
185 | ||
e9966ff8 SR |
186 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
187 | return 0; | |
188 | ||
1da177e4 LT |
189 | e = create_proc_entry("iSeries/config", 0, NULL); |
190 | if (e) | |
191 | e->proc_fops = &proc_viopath_operations; | |
192 | ||
193 | return 0; | |
194 | } | |
195 | __initcall(vio_proc_init); | |
196 | ||
197 | /* See if a given LP is active. Allow for invalid lps to be passed in | |
198 | * and just return invalid | |
199 | */ | |
200 | int viopath_isactive(HvLpIndex lp) | |
201 | { | |
202 | if (lp == HvLpIndexInvalid) | |
203 | return 0; | |
204 | if (lp < HVMAXARCHITECTEDLPS) | |
205 | return viopathStatus[lp].isActive; | |
206 | else | |
207 | return 0; | |
208 | } | |
209 | EXPORT_SYMBOL(viopath_isactive); | |
210 | ||
211 | /* | |
212 | * We cache the source and target instance ids for each | |
213 | * partition. | |
214 | */ | |
215 | HvLpInstanceId viopath_sourceinst(HvLpIndex lp) | |
216 | { | |
217 | return viopathStatus[lp].mSourceInst; | |
218 | } | |
219 | EXPORT_SYMBOL(viopath_sourceinst); | |
220 | ||
221 | HvLpInstanceId viopath_targetinst(HvLpIndex lp) | |
222 | { | |
223 | return viopathStatus[lp].mTargetInst; | |
224 | } | |
225 | EXPORT_SYMBOL(viopath_targetinst); | |
226 | ||
227 | /* | |
228 | * Send a monitor message. This is a message with the acknowledge | |
229 | * bit on that the other side will NOT explicitly acknowledge. When | |
230 | * the other side goes down, the hypervisor will acknowledge any | |
231 | * outstanding messages....so we will know when the other side dies. | |
232 | */ | |
233 | static void sendMonMsg(HvLpIndex remoteLp) | |
234 | { | |
235 | HvLpEvent_Rc hvrc; | |
236 | ||
237 | viopathStatus[remoteLp].mSourceInst = | |
238 | HvCallEvent_getSourceLpInstanceId(remoteLp, | |
239 | HvLpEvent_Type_VirtualIo); | |
240 | viopathStatus[remoteLp].mTargetInst = | |
241 | HvCallEvent_getTargetLpInstanceId(remoteLp, | |
242 | HvLpEvent_Type_VirtualIo); | |
243 | ||
244 | /* | |
245 | * Deliberately ignore the return code here. if we call this | |
246 | * more than once, we don't care. | |
247 | */ | |
248 | vio_setHandler(viomajorsubtype_monitor, handleMonitorEvent); | |
249 | ||
250 | hvrc = HvCallEvent_signalLpEventFast(remoteLp, HvLpEvent_Type_VirtualIo, | |
251 | viomajorsubtype_monitor, HvLpEvent_AckInd_DoAck, | |
252 | HvLpEvent_AckType_DeferredAck, | |
253 | viopathStatus[remoteLp].mSourceInst, | |
254 | viopathStatus[remoteLp].mTargetInst, | |
255 | viomonseq++, 0, 0, 0, 0, 0); | |
256 | ||
257 | if (hvrc == HvLpEvent_Rc_Good) | |
258 | viopathStatus[remoteLp].isActive = 1; | |
259 | else { | |
260 | printk(VIOPATH_KERN_WARN "could not connect to partition %d\n", | |
261 | remoteLp); | |
262 | viopathStatus[remoteLp].isActive = 0; | |
263 | } | |
264 | } | |
265 | ||
266 | static void handleMonitorEvent(struct HvLpEvent *event) | |
267 | { | |
268 | HvLpIndex remoteLp; | |
269 | int i; | |
270 | ||
271 | /* | |
272 | * This handler is _also_ called as part of the loop | |
273 | * at the end of this routine, so it must be able to | |
274 | * ignore NULL events... | |
275 | */ | |
276 | if (!event) | |
277 | return; | |
278 | ||
279 | /* | |
280 | * First see if this is just a normal monitor message from the | |
281 | * other partition | |
282 | */ | |
677f8c0d | 283 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
284 | remoteLp = event->xSourceLp; |
285 | if (!viopathStatus[remoteLp].isActive) | |
286 | sendMonMsg(remoteLp); | |
287 | return; | |
288 | } | |
289 | ||
290 | /* | |
291 | * This path is for an acknowledgement; the other partition | |
292 | * died | |
293 | */ | |
294 | remoteLp = event->xTargetLp; | |
295 | if ((event->xSourceInstanceId != viopathStatus[remoteLp].mSourceInst) || | |
296 | (event->xTargetInstanceId != viopathStatus[remoteLp].mTargetInst)) { | |
297 | printk(VIOPATH_KERN_WARN "ignoring ack....mismatched instances\n"); | |
298 | return; | |
299 | } | |
300 | ||
301 | printk(VIOPATH_KERN_WARN "partition %d ended\n", remoteLp); | |
302 | ||
303 | viopathStatus[remoteLp].isActive = 0; | |
304 | ||
305 | /* | |
306 | * For each active handler, pass them a NULL | |
307 | * message to indicate that the other partition | |
308 | * died | |
309 | */ | |
310 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) { | |
311 | if (vio_handler[i] != NULL) | |
312 | (*vio_handler[i])(NULL); | |
313 | } | |
314 | } | |
315 | ||
316 | int vio_setHandler(int subtype, vio_event_handler_t *beh) | |
317 | { | |
318 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
319 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
320 | return -EINVAL; | |
321 | if (vio_handler[subtype] != NULL) | |
322 | return -EBUSY; | |
323 | vio_handler[subtype] = beh; | |
324 | return 0; | |
325 | } | |
326 | EXPORT_SYMBOL(vio_setHandler); | |
327 | ||
328 | int vio_clearHandler(int subtype) | |
329 | { | |
330 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
331 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
332 | return -EINVAL; | |
333 | if (vio_handler[subtype] == NULL) | |
334 | return -EAGAIN; | |
335 | vio_handler[subtype] = NULL; | |
336 | return 0; | |
337 | } | |
338 | EXPORT_SYMBOL(vio_clearHandler); | |
339 | ||
340 | static void handleConfig(struct HvLpEvent *event) | |
341 | { | |
342 | if (!event) | |
343 | return; | |
677f8c0d | 344 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
345 | printk(VIOPATH_KERN_WARN |
346 | "unexpected config request from partition %d", | |
347 | event->xSourceLp); | |
348 | ||
677f8c0d | 349 | if (hvlpevent_need_ack(event)) { |
1da177e4 LT |
350 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
351 | HvCallEvent_ackLpEvent(event); | |
352 | } | |
353 | return; | |
354 | } | |
355 | ||
356 | up((struct semaphore *)event->xCorrelationToken); | |
357 | } | |
358 | ||
359 | /* | |
360 | * Initialization of the hosting partition | |
361 | */ | |
362 | void vio_set_hostlp(void) | |
363 | { | |
364 | /* | |
365 | * If this has already been set then we DON'T want to either change | |
366 | * it or re-register the proc file system | |
367 | */ | |
368 | if (viopath_hostLp != HvLpIndexInvalid) | |
369 | return; | |
370 | ||
371 | /* | |
372 | * Figure out our hosting partition. This isn't allowed to change | |
373 | * while we're active | |
374 | */ | |
375 | viopath_ourLp = HvLpConfig_getLpIndex(); | |
dd61ce92 | 376 | viopath_hostLp = HvLpConfig_getHostingLpIndex(viopath_ourLp); |
1da177e4 LT |
377 | |
378 | if (viopath_hostLp != HvLpIndexInvalid) | |
379 | vio_setHandler(viomajorsubtype_config, handleConfig); | |
380 | } | |
381 | EXPORT_SYMBOL(vio_set_hostlp); | |
382 | ||
35a84c2f | 383 | static void vio_handleEvent(struct HvLpEvent *event) |
1da177e4 LT |
384 | { |
385 | HvLpIndex remoteLp; | |
386 | int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK) | |
387 | >> VIOMAJOR_SUBTYPE_SHIFT; | |
388 | ||
677f8c0d | 389 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
390 | remoteLp = event->xSourceLp; |
391 | /* | |
392 | * The isActive is checked because if the hosting partition | |
393 | * went down and came back up it would not be active but it | |
394 | * would have different source and target instances, in which | |
395 | * case we'd want to reset them. This case really protects | |
396 | * against an unauthorized active partition sending interrupts | |
397 | * or acks to this linux partition. | |
398 | */ | |
399 | if (viopathStatus[remoteLp].isActive | |
400 | && (event->xSourceInstanceId != | |
401 | viopathStatus[remoteLp].mTargetInst)) { | |
402 | printk(VIOPATH_KERN_WARN | |
403 | "message from invalid partition. " | |
404 | "int msg rcvd, source inst (%d) doesnt match (%d)\n", | |
405 | viopathStatus[remoteLp].mTargetInst, | |
406 | event->xSourceInstanceId); | |
407 | return; | |
408 | } | |
409 | ||
410 | if (viopathStatus[remoteLp].isActive | |
411 | && (event->xTargetInstanceId != | |
412 | viopathStatus[remoteLp].mSourceInst)) { | |
413 | printk(VIOPATH_KERN_WARN | |
414 | "message from invalid partition. " | |
415 | "int msg rcvd, target inst (%d) doesnt match (%d)\n", | |
416 | viopathStatus[remoteLp].mSourceInst, | |
417 | event->xTargetInstanceId); | |
418 | return; | |
419 | } | |
420 | } else { | |
421 | remoteLp = event->xTargetLp; | |
422 | if (event->xSourceInstanceId != | |
423 | viopathStatus[remoteLp].mSourceInst) { | |
424 | printk(VIOPATH_KERN_WARN | |
425 | "message from invalid partition. " | |
426 | "ack msg rcvd, source inst (%d) doesnt match (%d)\n", | |
427 | viopathStatus[remoteLp].mSourceInst, | |
428 | event->xSourceInstanceId); | |
429 | return; | |
430 | } | |
431 | ||
432 | if (event->xTargetInstanceId != | |
433 | viopathStatus[remoteLp].mTargetInst) { | |
434 | printk(VIOPATH_KERN_WARN | |
435 | "message from invalid partition. " | |
436 | "viopath: ack msg rcvd, target inst (%d) doesnt match (%d)\n", | |
437 | viopathStatus[remoteLp].mTargetInst, | |
438 | event->xTargetInstanceId); | |
439 | return; | |
440 | } | |
441 | } | |
442 | ||
443 | if (vio_handler[subtype] == NULL) { | |
444 | printk(VIOPATH_KERN_WARN | |
445 | "unexpected virtual io event subtype %d from partition %d\n", | |
446 | event->xSubtype, remoteLp); | |
447 | /* No handler. Ack if necessary */ | |
677f8c0d | 448 | if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { |
1da177e4 LT |
449 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
450 | HvCallEvent_ackLpEvent(event); | |
451 | } | |
452 | return; | |
453 | } | |
454 | ||
455 | /* This innocuous little line is where all the real work happens */ | |
456 | (*vio_handler[subtype])(event); | |
457 | } | |
458 | ||
459 | static void viopath_donealloc(void *parm, int number) | |
460 | { | |
461 | struct alloc_parms *parmsp = parm; | |
462 | ||
463 | parmsp->number = number; | |
464 | if (parmsp->used_wait_atomic) | |
465 | atomic_set(&parmsp->wait_atomic, 0); | |
466 | else | |
467 | up(&parmsp->sem); | |
468 | } | |
469 | ||
470 | static int allocateEvents(HvLpIndex remoteLp, int numEvents) | |
471 | { | |
472 | struct alloc_parms parms; | |
473 | ||
474 | if (system_state != SYSTEM_RUNNING) { | |
475 | parms.used_wait_atomic = 1; | |
476 | atomic_set(&parms.wait_atomic, 1); | |
477 | } else { | |
478 | parms.used_wait_atomic = 0; | |
479 | init_MUTEX_LOCKED(&parms.sem); | |
480 | } | |
481 | mf_allocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, 250, /* It would be nice to put a real number here! */ | |
482 | numEvents, &viopath_donealloc, &parms); | |
483 | if (system_state != SYSTEM_RUNNING) { | |
484 | while (atomic_read(&parms.wait_atomic)) | |
485 | mb(); | |
486 | } else | |
487 | down(&parms.sem); | |
488 | return parms.number; | |
489 | } | |
490 | ||
491 | int viopath_open(HvLpIndex remoteLp, int subtype, int numReq) | |
492 | { | |
493 | int i; | |
494 | unsigned long flags; | |
495 | int tempNumAllocated; | |
496 | ||
c670b1ac | 497 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
1da177e4 LT |
498 | return -EINVAL; |
499 | ||
500 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
501 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
502 | return -EINVAL; | |
503 | ||
504 | spin_lock_irqsave(&statuslock, flags); | |
505 | ||
506 | if (!event_buffer_initialised) { | |
507 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) | |
508 | atomic_set(&event_buffer_available[i], 1); | |
509 | event_buffer_initialised = 1; | |
510 | } | |
511 | ||
512 | viopathStatus[remoteLp].users[subtype]++; | |
513 | ||
514 | if (!viopathStatus[remoteLp].isOpen) { | |
515 | viopathStatus[remoteLp].isOpen = 1; | |
516 | HvCallEvent_openLpEventPath(remoteLp, HvLpEvent_Type_VirtualIo); | |
517 | ||
518 | /* | |
519 | * Don't hold the spinlock during an operation that | |
520 | * can sleep. | |
521 | */ | |
522 | spin_unlock_irqrestore(&statuslock, flags); | |
523 | tempNumAllocated = allocateEvents(remoteLp, 1); | |
524 | spin_lock_irqsave(&statuslock, flags); | |
525 | ||
526 | viopathStatus[remoteLp].numberAllocated += tempNumAllocated; | |
527 | ||
528 | if (viopathStatus[remoteLp].numberAllocated == 0) { | |
529 | HvCallEvent_closeLpEventPath(remoteLp, | |
530 | HvLpEvent_Type_VirtualIo); | |
531 | ||
532 | spin_unlock_irqrestore(&statuslock, flags); | |
533 | return -ENOMEM; | |
534 | } | |
535 | ||
536 | viopathStatus[remoteLp].mSourceInst = | |
537 | HvCallEvent_getSourceLpInstanceId(remoteLp, | |
538 | HvLpEvent_Type_VirtualIo); | |
539 | viopathStatus[remoteLp].mTargetInst = | |
540 | HvCallEvent_getTargetLpInstanceId(remoteLp, | |
541 | HvLpEvent_Type_VirtualIo); | |
542 | HvLpEvent_registerHandler(HvLpEvent_Type_VirtualIo, | |
543 | &vio_handleEvent); | |
544 | sendMonMsg(remoteLp); | |
545 | printk(VIOPATH_KERN_INFO "opening connection to partition %d, " | |
546 | "setting sinst %d, tinst %d\n", | |
547 | remoteLp, viopathStatus[remoteLp].mSourceInst, | |
548 | viopathStatus[remoteLp].mTargetInst); | |
549 | } | |
550 | ||
551 | spin_unlock_irqrestore(&statuslock, flags); | |
552 | tempNumAllocated = allocateEvents(remoteLp, numReq); | |
553 | spin_lock_irqsave(&statuslock, flags); | |
554 | viopathStatus[remoteLp].numberAllocated += tempNumAllocated; | |
555 | spin_unlock_irqrestore(&statuslock, flags); | |
556 | ||
557 | return 0; | |
558 | } | |
559 | EXPORT_SYMBOL(viopath_open); | |
560 | ||
561 | int viopath_close(HvLpIndex remoteLp, int subtype, int numReq) | |
562 | { | |
563 | unsigned long flags; | |
564 | int i; | |
565 | int numOpen; | |
566 | struct alloc_parms parms; | |
567 | ||
c670b1ac | 568 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
1da177e4 LT |
569 | return -EINVAL; |
570 | ||
571 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
572 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
573 | return -EINVAL; | |
574 | ||
575 | spin_lock_irqsave(&statuslock, flags); | |
576 | /* | |
577 | * If the viopath_close somehow gets called before a | |
578 | * viopath_open it could decrement to -1 which is a non | |
579 | * recoverable state so we'll prevent this from | |
580 | * happening. | |
581 | */ | |
582 | if (viopathStatus[remoteLp].users[subtype] > 0) | |
583 | viopathStatus[remoteLp].users[subtype]--; | |
584 | ||
585 | spin_unlock_irqrestore(&statuslock, flags); | |
586 | ||
587 | parms.used_wait_atomic = 0; | |
588 | init_MUTEX_LOCKED(&parms.sem); | |
589 | mf_deallocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, | |
590 | numReq, &viopath_donealloc, &parms); | |
591 | down(&parms.sem); | |
592 | ||
593 | spin_lock_irqsave(&statuslock, flags); | |
594 | for (i = 0, numOpen = 0; i < VIO_MAX_SUBTYPES; i++) | |
595 | numOpen += viopathStatus[remoteLp].users[i]; | |
596 | ||
597 | if ((viopathStatus[remoteLp].isOpen) && (numOpen == 0)) { | |
598 | printk(VIOPATH_KERN_INFO "closing connection to partition %d", | |
599 | remoteLp); | |
600 | ||
601 | HvCallEvent_closeLpEventPath(remoteLp, | |
602 | HvLpEvent_Type_VirtualIo); | |
603 | viopathStatus[remoteLp].isOpen = 0; | |
604 | viopathStatus[remoteLp].isActive = 0; | |
605 | ||
606 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) | |
607 | atomic_set(&event_buffer_available[i], 0); | |
608 | event_buffer_initialised = 0; | |
609 | } | |
610 | spin_unlock_irqrestore(&statuslock, flags); | |
611 | return 0; | |
612 | } | |
613 | EXPORT_SYMBOL(viopath_close); | |
614 | ||
615 | void *vio_get_event_buffer(int subtype) | |
616 | { | |
617 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
618 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
619 | return NULL; | |
620 | ||
621 | if (atomic_dec_if_positive(&event_buffer_available[subtype]) == 0) | |
622 | return &event_buffer[subtype * 256]; | |
623 | else | |
624 | return NULL; | |
625 | } | |
626 | EXPORT_SYMBOL(vio_get_event_buffer); | |
627 | ||
628 | void vio_free_event_buffer(int subtype, void *buffer) | |
629 | { | |
630 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
631 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) { | |
632 | printk(VIOPATH_KERN_WARN | |
633 | "unexpected subtype %d freeing event buffer\n", subtype); | |
634 | return; | |
635 | } | |
636 | ||
637 | if (atomic_read(&event_buffer_available[subtype]) != 0) { | |
638 | printk(VIOPATH_KERN_WARN | |
639 | "freeing unallocated event buffer, subtype %d\n", | |
640 | subtype); | |
641 | return; | |
642 | } | |
643 | ||
644 | if (buffer != &event_buffer[subtype * 256]) { | |
645 | printk(VIOPATH_KERN_WARN | |
646 | "freeing invalid event buffer, subtype %d\n", subtype); | |
647 | } | |
648 | ||
649 | atomic_set(&event_buffer_available[subtype], 1); | |
650 | } | |
651 | EXPORT_SYMBOL(vio_free_event_buffer); | |
652 | ||
653 | static const struct vio_error_entry vio_no_error = | |
654 | { 0, 0, "Non-VIO Error" }; | |
655 | static const struct vio_error_entry vio_unknown_error = | |
656 | { 0, EIO, "Unknown Error" }; | |
657 | ||
658 | static const struct vio_error_entry vio_default_errors[] = { | |
659 | {0x0001, EIO, "No Connection"}, | |
660 | {0x0002, EIO, "No Receiver"}, | |
661 | {0x0003, EIO, "No Buffer Available"}, | |
662 | {0x0004, EBADRQC, "Invalid Message Type"}, | |
663 | {0x0000, 0, NULL}, | |
664 | }; | |
665 | ||
666 | const struct vio_error_entry *vio_lookup_rc( | |
667 | const struct vio_error_entry *local_table, u16 rc) | |
668 | { | |
669 | const struct vio_error_entry *cur; | |
670 | ||
671 | if (!rc) | |
672 | return &vio_no_error; | |
673 | if (local_table) | |
674 | for (cur = local_table; cur->rc; ++cur) | |
675 | if (cur->rc == rc) | |
676 | return cur; | |
677 | for (cur = vio_default_errors; cur->rc; ++cur) | |
678 | if (cur->rc == rc) | |
679 | return cur; | |
680 | return &vio_unknown_error; | |
681 | } | |
682 | EXPORT_SYMBOL(vio_lookup_rc); |