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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> | |
39 | #include <linux/smp_lock.h> | |
40 | #include <linux/interrupt.h> | |
41 | ||
42 | #include <asm/system.h> | |
43 | #include <asm/uaccess.h> | |
1ec65d76 | 44 | #include <asm/iseries/hv_types.h> |
7b487bb8 | 45 | #include <asm/iseries/it_exp_vpd_panel.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); | |
119 | ||
3c726f8d | 120 | buf = kmalloc(HW_PAGE_SIZE, GFP_KERNEL); |
1da177e4 LT |
121 | if (!buf) |
122 | return 0; | |
3c726f8d | 123 | memset(buf, 0, HW_PAGE_SIZE); |
1da177e4 | 124 | |
3c726f8d | 125 | handle = dma_map_single(iSeries_vio_dev, buf, HW_PAGE_SIZE, |
1da177e4 LT |
126 | DMA_FROM_DEVICE); |
127 | ||
128 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
129 | HvLpEvent_Type_VirtualIo, | |
130 | viomajorsubtype_config | vioconfigget, | |
131 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
132 | viopath_sourceinst(viopath_hostLp), | |
133 | viopath_targetinst(viopath_hostLp), | |
134 | (u64)(unsigned long)&Semaphore, VIOVERSION << 16, | |
3c726f8d | 135 | ((u64)handle) << 32, HW_PAGE_SIZE, 0, 0); |
1da177e4 LT |
136 | |
137 | if (hvrc != HvLpEvent_Rc_Good) | |
138 | printk(VIOPATH_KERN_WARN "hv error on op %d\n", (int)hvrc); | |
139 | ||
140 | down(&Semaphore); | |
141 | ||
142 | vlanMap = HvLpConfig_getVirtualLanIndexMap(); | |
143 | ||
3c726f8d | 144 | buf[HW_PAGE_SIZE-1] = '\0'; |
1da177e4 LT |
145 | seq_printf(m, "%s", buf); |
146 | seq_printf(m, "AVAILABLE_VETH=%x\n", vlanMap); | |
147 | seq_printf(m, "SRLNBR=%c%c%c%c%c%c%c\n", | |
148 | e2a(xItExtVpdPanel.mfgID[2]), | |
149 | e2a(xItExtVpdPanel.mfgID[3]), | |
150 | e2a(xItExtVpdPanel.systemSerial[1]), | |
151 | e2a(xItExtVpdPanel.systemSerial[2]), | |
152 | e2a(xItExtVpdPanel.systemSerial[3]), | |
153 | e2a(xItExtVpdPanel.systemSerial[4]), | |
154 | e2a(xItExtVpdPanel.systemSerial[5])); | |
155 | ||
3c726f8d BH |
156 | dma_unmap_single(iSeries_vio_dev, handle, HW_PAGE_SIZE, |
157 | DMA_FROM_DEVICE); | |
1da177e4 LT |
158 | kfree(buf); |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | static int proc_viopath_open(struct inode *inode, struct file *file) | |
164 | { | |
165 | return single_open(file, proc_viopath_show, NULL); | |
166 | } | |
167 | ||
168 | static struct file_operations proc_viopath_operations = { | |
169 | .open = proc_viopath_open, | |
170 | .read = seq_read, | |
171 | .llseek = seq_lseek, | |
172 | .release = single_release, | |
173 | }; | |
174 | ||
175 | static int __init vio_proc_init(void) | |
176 | { | |
177 | struct proc_dir_entry *e; | |
178 | ||
179 | e = create_proc_entry("iSeries/config", 0, NULL); | |
180 | if (e) | |
181 | e->proc_fops = &proc_viopath_operations; | |
182 | ||
183 | return 0; | |
184 | } | |
185 | __initcall(vio_proc_init); | |
186 | ||
187 | /* See if a given LP is active. Allow for invalid lps to be passed in | |
188 | * and just return invalid | |
189 | */ | |
190 | int viopath_isactive(HvLpIndex lp) | |
191 | { | |
192 | if (lp == HvLpIndexInvalid) | |
193 | return 0; | |
194 | if (lp < HVMAXARCHITECTEDLPS) | |
195 | return viopathStatus[lp].isActive; | |
196 | else | |
197 | return 0; | |
198 | } | |
199 | EXPORT_SYMBOL(viopath_isactive); | |
200 | ||
201 | /* | |
202 | * We cache the source and target instance ids for each | |
203 | * partition. | |
204 | */ | |
205 | HvLpInstanceId viopath_sourceinst(HvLpIndex lp) | |
206 | { | |
207 | return viopathStatus[lp].mSourceInst; | |
208 | } | |
209 | EXPORT_SYMBOL(viopath_sourceinst); | |
210 | ||
211 | HvLpInstanceId viopath_targetinst(HvLpIndex lp) | |
212 | { | |
213 | return viopathStatus[lp].mTargetInst; | |
214 | } | |
215 | EXPORT_SYMBOL(viopath_targetinst); | |
216 | ||
217 | /* | |
218 | * Send a monitor message. This is a message with the acknowledge | |
219 | * bit on that the other side will NOT explicitly acknowledge. When | |
220 | * the other side goes down, the hypervisor will acknowledge any | |
221 | * outstanding messages....so we will know when the other side dies. | |
222 | */ | |
223 | static void sendMonMsg(HvLpIndex remoteLp) | |
224 | { | |
225 | HvLpEvent_Rc hvrc; | |
226 | ||
227 | viopathStatus[remoteLp].mSourceInst = | |
228 | HvCallEvent_getSourceLpInstanceId(remoteLp, | |
229 | HvLpEvent_Type_VirtualIo); | |
230 | viopathStatus[remoteLp].mTargetInst = | |
231 | HvCallEvent_getTargetLpInstanceId(remoteLp, | |
232 | HvLpEvent_Type_VirtualIo); | |
233 | ||
234 | /* | |
235 | * Deliberately ignore the return code here. if we call this | |
236 | * more than once, we don't care. | |
237 | */ | |
238 | vio_setHandler(viomajorsubtype_monitor, handleMonitorEvent); | |
239 | ||
240 | hvrc = HvCallEvent_signalLpEventFast(remoteLp, HvLpEvent_Type_VirtualIo, | |
241 | viomajorsubtype_monitor, HvLpEvent_AckInd_DoAck, | |
242 | HvLpEvent_AckType_DeferredAck, | |
243 | viopathStatus[remoteLp].mSourceInst, | |
244 | viopathStatus[remoteLp].mTargetInst, | |
245 | viomonseq++, 0, 0, 0, 0, 0); | |
246 | ||
247 | if (hvrc == HvLpEvent_Rc_Good) | |
248 | viopathStatus[remoteLp].isActive = 1; | |
249 | else { | |
250 | printk(VIOPATH_KERN_WARN "could not connect to partition %d\n", | |
251 | remoteLp); | |
252 | viopathStatus[remoteLp].isActive = 0; | |
253 | } | |
254 | } | |
255 | ||
256 | static void handleMonitorEvent(struct HvLpEvent *event) | |
257 | { | |
258 | HvLpIndex remoteLp; | |
259 | int i; | |
260 | ||
261 | /* | |
262 | * This handler is _also_ called as part of the loop | |
263 | * at the end of this routine, so it must be able to | |
264 | * ignore NULL events... | |
265 | */ | |
266 | if (!event) | |
267 | return; | |
268 | ||
269 | /* | |
270 | * First see if this is just a normal monitor message from the | |
271 | * other partition | |
272 | */ | |
273 | if (event->xFlags.xFunction == HvLpEvent_Function_Int) { | |
274 | remoteLp = event->xSourceLp; | |
275 | if (!viopathStatus[remoteLp].isActive) | |
276 | sendMonMsg(remoteLp); | |
277 | return; | |
278 | } | |
279 | ||
280 | /* | |
281 | * This path is for an acknowledgement; the other partition | |
282 | * died | |
283 | */ | |
284 | remoteLp = event->xTargetLp; | |
285 | if ((event->xSourceInstanceId != viopathStatus[remoteLp].mSourceInst) || | |
286 | (event->xTargetInstanceId != viopathStatus[remoteLp].mTargetInst)) { | |
287 | printk(VIOPATH_KERN_WARN "ignoring ack....mismatched instances\n"); | |
288 | return; | |
289 | } | |
290 | ||
291 | printk(VIOPATH_KERN_WARN "partition %d ended\n", remoteLp); | |
292 | ||
293 | viopathStatus[remoteLp].isActive = 0; | |
294 | ||
295 | /* | |
296 | * For each active handler, pass them a NULL | |
297 | * message to indicate that the other partition | |
298 | * died | |
299 | */ | |
300 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) { | |
301 | if (vio_handler[i] != NULL) | |
302 | (*vio_handler[i])(NULL); | |
303 | } | |
304 | } | |
305 | ||
306 | int vio_setHandler(int subtype, vio_event_handler_t *beh) | |
307 | { | |
308 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
309 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
310 | return -EINVAL; | |
311 | if (vio_handler[subtype] != NULL) | |
312 | return -EBUSY; | |
313 | vio_handler[subtype] = beh; | |
314 | return 0; | |
315 | } | |
316 | EXPORT_SYMBOL(vio_setHandler); | |
317 | ||
318 | int vio_clearHandler(int subtype) | |
319 | { | |
320 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
321 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
322 | return -EINVAL; | |
323 | if (vio_handler[subtype] == NULL) | |
324 | return -EAGAIN; | |
325 | vio_handler[subtype] = NULL; | |
326 | return 0; | |
327 | } | |
328 | EXPORT_SYMBOL(vio_clearHandler); | |
329 | ||
330 | static void handleConfig(struct HvLpEvent *event) | |
331 | { | |
332 | if (!event) | |
333 | return; | |
334 | if (event->xFlags.xFunction == HvLpEvent_Function_Int) { | |
335 | printk(VIOPATH_KERN_WARN | |
336 | "unexpected config request from partition %d", | |
337 | event->xSourceLp); | |
338 | ||
339 | if ((event->xFlags.xFunction == HvLpEvent_Function_Int) && | |
340 | (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) { | |
341 | event->xRc = HvLpEvent_Rc_InvalidSubtype; | |
342 | HvCallEvent_ackLpEvent(event); | |
343 | } | |
344 | return; | |
345 | } | |
346 | ||
347 | up((struct semaphore *)event->xCorrelationToken); | |
348 | } | |
349 | ||
350 | /* | |
351 | * Initialization of the hosting partition | |
352 | */ | |
353 | void vio_set_hostlp(void) | |
354 | { | |
355 | /* | |
356 | * If this has already been set then we DON'T want to either change | |
357 | * it or re-register the proc file system | |
358 | */ | |
359 | if (viopath_hostLp != HvLpIndexInvalid) | |
360 | return; | |
361 | ||
362 | /* | |
363 | * Figure out our hosting partition. This isn't allowed to change | |
364 | * while we're active | |
365 | */ | |
366 | viopath_ourLp = HvLpConfig_getLpIndex(); | |
dd61ce92 | 367 | viopath_hostLp = HvLpConfig_getHostingLpIndex(viopath_ourLp); |
1da177e4 LT |
368 | |
369 | if (viopath_hostLp != HvLpIndexInvalid) | |
370 | vio_setHandler(viomajorsubtype_config, handleConfig); | |
371 | } | |
372 | EXPORT_SYMBOL(vio_set_hostlp); | |
373 | ||
374 | static void vio_handleEvent(struct HvLpEvent *event, struct pt_regs *regs) | |
375 | { | |
376 | HvLpIndex remoteLp; | |
377 | int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK) | |
378 | >> VIOMAJOR_SUBTYPE_SHIFT; | |
379 | ||
380 | if (event->xFlags.xFunction == HvLpEvent_Function_Int) { | |
381 | remoteLp = event->xSourceLp; | |
382 | /* | |
383 | * The isActive is checked because if the hosting partition | |
384 | * went down and came back up it would not be active but it | |
385 | * would have different source and target instances, in which | |
386 | * case we'd want to reset them. This case really protects | |
387 | * against an unauthorized active partition sending interrupts | |
388 | * or acks to this linux partition. | |
389 | */ | |
390 | if (viopathStatus[remoteLp].isActive | |
391 | && (event->xSourceInstanceId != | |
392 | viopathStatus[remoteLp].mTargetInst)) { | |
393 | printk(VIOPATH_KERN_WARN | |
394 | "message from invalid partition. " | |
395 | "int msg rcvd, source inst (%d) doesnt match (%d)\n", | |
396 | viopathStatus[remoteLp].mTargetInst, | |
397 | event->xSourceInstanceId); | |
398 | return; | |
399 | } | |
400 | ||
401 | if (viopathStatus[remoteLp].isActive | |
402 | && (event->xTargetInstanceId != | |
403 | viopathStatus[remoteLp].mSourceInst)) { | |
404 | printk(VIOPATH_KERN_WARN | |
405 | "message from invalid partition. " | |
406 | "int msg rcvd, target inst (%d) doesnt match (%d)\n", | |
407 | viopathStatus[remoteLp].mSourceInst, | |
408 | event->xTargetInstanceId); | |
409 | return; | |
410 | } | |
411 | } else { | |
412 | remoteLp = event->xTargetLp; | |
413 | if (event->xSourceInstanceId != | |
414 | viopathStatus[remoteLp].mSourceInst) { | |
415 | printk(VIOPATH_KERN_WARN | |
416 | "message from invalid partition. " | |
417 | "ack msg rcvd, source inst (%d) doesnt match (%d)\n", | |
418 | viopathStatus[remoteLp].mSourceInst, | |
419 | event->xSourceInstanceId); | |
420 | return; | |
421 | } | |
422 | ||
423 | if (event->xTargetInstanceId != | |
424 | viopathStatus[remoteLp].mTargetInst) { | |
425 | printk(VIOPATH_KERN_WARN | |
426 | "message from invalid partition. " | |
427 | "viopath: ack msg rcvd, target inst (%d) doesnt match (%d)\n", | |
428 | viopathStatus[remoteLp].mTargetInst, | |
429 | event->xTargetInstanceId); | |
430 | return; | |
431 | } | |
432 | } | |
433 | ||
434 | if (vio_handler[subtype] == NULL) { | |
435 | printk(VIOPATH_KERN_WARN | |
436 | "unexpected virtual io event subtype %d from partition %d\n", | |
437 | event->xSubtype, remoteLp); | |
438 | /* No handler. Ack if necessary */ | |
439 | if ((event->xFlags.xFunction == HvLpEvent_Function_Int) && | |
440 | (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) { | |
441 | event->xRc = HvLpEvent_Rc_InvalidSubtype; | |
442 | HvCallEvent_ackLpEvent(event); | |
443 | } | |
444 | return; | |
445 | } | |
446 | ||
447 | /* This innocuous little line is where all the real work happens */ | |
448 | (*vio_handler[subtype])(event); | |
449 | } | |
450 | ||
451 | static void viopath_donealloc(void *parm, int number) | |
452 | { | |
453 | struct alloc_parms *parmsp = parm; | |
454 | ||
455 | parmsp->number = number; | |
456 | if (parmsp->used_wait_atomic) | |
457 | atomic_set(&parmsp->wait_atomic, 0); | |
458 | else | |
459 | up(&parmsp->sem); | |
460 | } | |
461 | ||
462 | static int allocateEvents(HvLpIndex remoteLp, int numEvents) | |
463 | { | |
464 | struct alloc_parms parms; | |
465 | ||
466 | if (system_state != SYSTEM_RUNNING) { | |
467 | parms.used_wait_atomic = 1; | |
468 | atomic_set(&parms.wait_atomic, 1); | |
469 | } else { | |
470 | parms.used_wait_atomic = 0; | |
471 | init_MUTEX_LOCKED(&parms.sem); | |
472 | } | |
473 | mf_allocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, 250, /* It would be nice to put a real number here! */ | |
474 | numEvents, &viopath_donealloc, &parms); | |
475 | if (system_state != SYSTEM_RUNNING) { | |
476 | while (atomic_read(&parms.wait_atomic)) | |
477 | mb(); | |
478 | } else | |
479 | down(&parms.sem); | |
480 | return parms.number; | |
481 | } | |
482 | ||
483 | int viopath_open(HvLpIndex remoteLp, int subtype, int numReq) | |
484 | { | |
485 | int i; | |
486 | unsigned long flags; | |
487 | int tempNumAllocated; | |
488 | ||
c670b1ac | 489 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
1da177e4 LT |
490 | return -EINVAL; |
491 | ||
492 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
493 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
494 | return -EINVAL; | |
495 | ||
496 | spin_lock_irqsave(&statuslock, flags); | |
497 | ||
498 | if (!event_buffer_initialised) { | |
499 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) | |
500 | atomic_set(&event_buffer_available[i], 1); | |
501 | event_buffer_initialised = 1; | |
502 | } | |
503 | ||
504 | viopathStatus[remoteLp].users[subtype]++; | |
505 | ||
506 | if (!viopathStatus[remoteLp].isOpen) { | |
507 | viopathStatus[remoteLp].isOpen = 1; | |
508 | HvCallEvent_openLpEventPath(remoteLp, HvLpEvent_Type_VirtualIo); | |
509 | ||
510 | /* | |
511 | * Don't hold the spinlock during an operation that | |
512 | * can sleep. | |
513 | */ | |
514 | spin_unlock_irqrestore(&statuslock, flags); | |
515 | tempNumAllocated = allocateEvents(remoteLp, 1); | |
516 | spin_lock_irqsave(&statuslock, flags); | |
517 | ||
518 | viopathStatus[remoteLp].numberAllocated += tempNumAllocated; | |
519 | ||
520 | if (viopathStatus[remoteLp].numberAllocated == 0) { | |
521 | HvCallEvent_closeLpEventPath(remoteLp, | |
522 | HvLpEvent_Type_VirtualIo); | |
523 | ||
524 | spin_unlock_irqrestore(&statuslock, flags); | |
525 | return -ENOMEM; | |
526 | } | |
527 | ||
528 | viopathStatus[remoteLp].mSourceInst = | |
529 | HvCallEvent_getSourceLpInstanceId(remoteLp, | |
530 | HvLpEvent_Type_VirtualIo); | |
531 | viopathStatus[remoteLp].mTargetInst = | |
532 | HvCallEvent_getTargetLpInstanceId(remoteLp, | |
533 | HvLpEvent_Type_VirtualIo); | |
534 | HvLpEvent_registerHandler(HvLpEvent_Type_VirtualIo, | |
535 | &vio_handleEvent); | |
536 | sendMonMsg(remoteLp); | |
537 | printk(VIOPATH_KERN_INFO "opening connection to partition %d, " | |
538 | "setting sinst %d, tinst %d\n", | |
539 | remoteLp, viopathStatus[remoteLp].mSourceInst, | |
540 | viopathStatus[remoteLp].mTargetInst); | |
541 | } | |
542 | ||
543 | spin_unlock_irqrestore(&statuslock, flags); | |
544 | tempNumAllocated = allocateEvents(remoteLp, numReq); | |
545 | spin_lock_irqsave(&statuslock, flags); | |
546 | viopathStatus[remoteLp].numberAllocated += tempNumAllocated; | |
547 | spin_unlock_irqrestore(&statuslock, flags); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | EXPORT_SYMBOL(viopath_open); | |
552 | ||
553 | int viopath_close(HvLpIndex remoteLp, int subtype, int numReq) | |
554 | { | |
555 | unsigned long flags; | |
556 | int i; | |
557 | int numOpen; | |
558 | struct alloc_parms parms; | |
559 | ||
c670b1ac | 560 | if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid)) |
1da177e4 LT |
561 | return -EINVAL; |
562 | ||
563 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
564 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
565 | return -EINVAL; | |
566 | ||
567 | spin_lock_irqsave(&statuslock, flags); | |
568 | /* | |
569 | * If the viopath_close somehow gets called before a | |
570 | * viopath_open it could decrement to -1 which is a non | |
571 | * recoverable state so we'll prevent this from | |
572 | * happening. | |
573 | */ | |
574 | if (viopathStatus[remoteLp].users[subtype] > 0) | |
575 | viopathStatus[remoteLp].users[subtype]--; | |
576 | ||
577 | spin_unlock_irqrestore(&statuslock, flags); | |
578 | ||
579 | parms.used_wait_atomic = 0; | |
580 | init_MUTEX_LOCKED(&parms.sem); | |
581 | mf_deallocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, | |
582 | numReq, &viopath_donealloc, &parms); | |
583 | down(&parms.sem); | |
584 | ||
585 | spin_lock_irqsave(&statuslock, flags); | |
586 | for (i = 0, numOpen = 0; i < VIO_MAX_SUBTYPES; i++) | |
587 | numOpen += viopathStatus[remoteLp].users[i]; | |
588 | ||
589 | if ((viopathStatus[remoteLp].isOpen) && (numOpen == 0)) { | |
590 | printk(VIOPATH_KERN_INFO "closing connection to partition %d", | |
591 | remoteLp); | |
592 | ||
593 | HvCallEvent_closeLpEventPath(remoteLp, | |
594 | HvLpEvent_Type_VirtualIo); | |
595 | viopathStatus[remoteLp].isOpen = 0; | |
596 | viopathStatus[remoteLp].isActive = 0; | |
597 | ||
598 | for (i = 0; i < VIO_MAX_SUBTYPES; i++) | |
599 | atomic_set(&event_buffer_available[i], 0); | |
600 | event_buffer_initialised = 0; | |
601 | } | |
602 | spin_unlock_irqrestore(&statuslock, flags); | |
603 | return 0; | |
604 | } | |
605 | EXPORT_SYMBOL(viopath_close); | |
606 | ||
607 | void *vio_get_event_buffer(int subtype) | |
608 | { | |
609 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
610 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) | |
611 | return NULL; | |
612 | ||
613 | if (atomic_dec_if_positive(&event_buffer_available[subtype]) == 0) | |
614 | return &event_buffer[subtype * 256]; | |
615 | else | |
616 | return NULL; | |
617 | } | |
618 | EXPORT_SYMBOL(vio_get_event_buffer); | |
619 | ||
620 | void vio_free_event_buffer(int subtype, void *buffer) | |
621 | { | |
622 | subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT; | |
623 | if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) { | |
624 | printk(VIOPATH_KERN_WARN | |
625 | "unexpected subtype %d freeing event buffer\n", subtype); | |
626 | return; | |
627 | } | |
628 | ||
629 | if (atomic_read(&event_buffer_available[subtype]) != 0) { | |
630 | printk(VIOPATH_KERN_WARN | |
631 | "freeing unallocated event buffer, subtype %d\n", | |
632 | subtype); | |
633 | return; | |
634 | } | |
635 | ||
636 | if (buffer != &event_buffer[subtype * 256]) { | |
637 | printk(VIOPATH_KERN_WARN | |
638 | "freeing invalid event buffer, subtype %d\n", subtype); | |
639 | } | |
640 | ||
641 | atomic_set(&event_buffer_available[subtype], 1); | |
642 | } | |
643 | EXPORT_SYMBOL(vio_free_event_buffer); | |
644 | ||
645 | static const struct vio_error_entry vio_no_error = | |
646 | { 0, 0, "Non-VIO Error" }; | |
647 | static const struct vio_error_entry vio_unknown_error = | |
648 | { 0, EIO, "Unknown Error" }; | |
649 | ||
650 | static const struct vio_error_entry vio_default_errors[] = { | |
651 | {0x0001, EIO, "No Connection"}, | |
652 | {0x0002, EIO, "No Receiver"}, | |
653 | {0x0003, EIO, "No Buffer Available"}, | |
654 | {0x0004, EBADRQC, "Invalid Message Type"}, | |
655 | {0x0000, 0, NULL}, | |
656 | }; | |
657 | ||
658 | const struct vio_error_entry *vio_lookup_rc( | |
659 | const struct vio_error_entry *local_table, u16 rc) | |
660 | { | |
661 | const struct vio_error_entry *cur; | |
662 | ||
663 | if (!rc) | |
664 | return &vio_no_error; | |
665 | if (local_table) | |
666 | for (cur = local_table; cur->rc; ++cur) | |
667 | if (cur->rc == rc) | |
668 | return cur; | |
669 | for (cur = vio_default_errors; cur->rc; ++cur) | |
670 | if (cur->rc == rc) | |
671 | return cur; | |
672 | return &vio_unknown_error; | |
673 | } | |
674 | EXPORT_SYMBOL(vio_lookup_rc); |