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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 | */ | |
4b16f8e2 | 30 | #include <linux/export.h> |
1da177e4 | 31 | #include <linux/kernel.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
1da177e4 | 40 | #include <linux/interrupt.h> |
9d561ed4 | 41 | #include <linux/completion.h> |
1da177e4 LT |
42 | |
43 | #include <asm/system.h> | |
44 | #include <asm/uaccess.h> | |
a749690e | 45 | #include <asm/prom.h> |
e9966ff8 | 46 | #include <asm/firmware.h> |
1ec65d76 | 47 | #include <asm/iseries/hv_types.h> |
e45423ea | 48 | #include <asm/iseries/hv_lp_event.h> |
15b17189 | 49 | #include <asm/iseries/hv_lp_config.h> |
bbc8b628 | 50 | #include <asm/iseries/mf.h> |
b4206778 | 51 | #include <asm/iseries/vio.h> |
1da177e4 LT |
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 | */ | |
3c726f8d BH |
73 | static unsigned char event_buffer[VIO_MAX_SUBTYPES * 256] |
74 | __attribute__((__aligned__(4096))); | |
1da177e4 LT |
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 { | |
39d20703 | 86 | struct completion done; |
1da177e4 LT |
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; | |
c3a66359 | 120 | DECLARE_COMPLETION_ONSTACK(done); |
a749690e | 121 | struct device_node *node; |
a0a428e3 | 122 | const char *sysid; |
1da177e4 | 123 | |
f8485350 | 124 | buf = kzalloc(HW_PAGE_SIZE, GFP_KERNEL); |
1da177e4 LT |
125 | if (!buf) |
126 | return 0; | |
1da177e4 | 127 | |
1670b2b2 | 128 | handle = iseries_hv_map(buf, HW_PAGE_SIZE, DMA_FROM_DEVICE); |
1da177e4 LT |
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), | |
9d561ed4 | 136 | (u64)(unsigned long)&done, 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 | ||
9d561ed4 | 142 | wait_for_completion(&done); |
1da177e4 LT |
143 | |
144 | vlanMap = HvLpConfig_getVirtualLanIndexMap(); | |
145 | ||
3c726f8d | 146 | buf[HW_PAGE_SIZE-1] = '\0'; |
1da177e4 | 147 | seq_printf(m, "%s", buf); |
1da177e4 | 148 | |
1670b2b2 | 149 | iseries_hv_unmap(handle, HW_PAGE_SIZE, 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 | { | |
e9966ff8 SR |
184 | if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
185 | return 0; | |
186 | ||
66747138 | 187 | proc_create("iSeries/config", 0, NULL, &proc_viopath_operations); |
1da177e4 LT |
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 | */ | |
677f8c0d | 278 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
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; | |
677f8c0d | 339 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
340 | printk(VIOPATH_KERN_WARN |
341 | "unexpected config request from partition %d", | |
342 | event->xSourceLp); | |
343 | ||
677f8c0d | 344 | if (hvlpevent_need_ack(event)) { |
1da177e4 LT |
345 | event->xRc = HvLpEvent_Rc_InvalidSubtype; |
346 | HvCallEvent_ackLpEvent(event); | |
347 | } | |
348 | return; | |
349 | } | |
350 | ||
9d561ed4 | 351 | complete((struct completion *)event->xCorrelationToken); |
1da177e4 LT |
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(); | |
dd61ce92 | 371 | viopath_hostLp = HvLpConfig_getHostingLpIndex(viopath_ourLp); |
1da177e4 LT |
372 | |
373 | if (viopath_hostLp != HvLpIndexInvalid) | |
374 | vio_setHandler(viomajorsubtype_config, handleConfig); | |
375 | } | |
376 | EXPORT_SYMBOL(vio_set_hostlp); | |
377 | ||
35a84c2f | 378 | static void vio_handleEvent(struct HvLpEvent *event) |
1da177e4 LT |
379 | { |
380 | HvLpIndex remoteLp; | |
381 | int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK) | |
382 | >> VIOMAJOR_SUBTYPE_SHIFT; | |
383 | ||
677f8c0d | 384 | if (hvlpevent_is_int(event)) { |
1da177e4 LT |
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. " | |
25985edc | 399 | "int msg rcvd, source inst (%d) doesn't match (%d)\n", |
1da177e4 LT |
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. " | |
25985edc | 410 | "int msg rcvd, target inst (%d) doesn't match (%d)\n", |
1da177e4 LT |
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. " | |
25985edc | 421 | "ack msg rcvd, source inst (%d) doesn't match (%d)\n", |
1da177e4 LT |
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. " | |
25985edc | 431 | "viopath: ack msg rcvd, target inst (%d) doesn't match (%d)\n", |
1da177e4 LT |
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 */ | |
677f8c0d | 443 | if (hvlpevent_is_int(event) && hvlpevent_need_ack(event)) { |
1da177e4 LT |
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 | |
39d20703 | 462 | complete(&parmsp->done); |
1da177e4 LT |
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; | |
39d20703 | 474 | init_completion(&parms.done); |
1da177e4 LT |
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 | |
39d20703 | 482 | wait_for_completion(&parms.done); |
1da177e4 LT |
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 | ||
c670b1ac | 492 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
1da177e4 LT |
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 | ||
c670b1ac | 563 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
1da177e4 LT |
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; | |
39d20703 | 583 | init_completion(&parms.done); |
1da177e4 LT |
584 | mf_deallocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, |
585 | numReq, &viopath_donealloc, &parms); | |
39d20703 | 586 | wait_for_completion(&parms.done); |
1da177e4 LT |
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)) { | |
7d6524f0 | 593 | printk(VIOPATH_KERN_INFO "closing connection to partition %d\n", |
1da177e4 LT |
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); |