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-rw-r--r--arch/ppc64/kernel/viopath.c673
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diff --git a/arch/ppc64/kernel/viopath.c b/arch/ppc64/kernel/viopath.c
deleted file mode 100644
index 2a6c4f01c45e..000000000000
--- a/arch/ppc64/kernel/viopath.c
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1/* -*- linux-c -*-
2 * arch/ppc64/kernel/viopath.c
3 *
4 * iSeries Virtual I/O Message Path code
5 *
6 * Authors: Dave Boutcher <boutcher@us.ibm.com>
7 * Ryan Arnold <ryanarn@us.ibm.com>
8 * Colin Devilbiss <devilbis@us.ibm.com>
9 *
10 * (C) Copyright 2000-2003 IBM Corporation
11 *
12 * This code is used by the iSeries virtual disk, cd,
13 * tape, and console to communicate with OS/400 in another
14 * partition.
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of the
19 * License, or (at your option) anyu later version.
20 *
21 * This program is distributed in the hope that it will be useful, but
22 * WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 * General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software Foundation,
28 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 */
31#include <linux/module.h>
32#include <linux/kernel.h>
33#include <linux/errno.h>
34#include <linux/vmalloc.h>
35#include <linux/string.h>
36#include <linux/proc_fs.h>
37#include <linux/dma-mapping.h>
38#include <linux/wait.h>
39#include <linux/seq_file.h>
40#include <linux/smp_lock.h>
41#include <linux/interrupt.h>
42
43#include <asm/system.h>
44#include <asm/uaccess.h>
45#include <asm/iSeries/HvTypes.h>
46#include <asm/iSeries/ItExtVpdPanel.h>
47#include <asm/iSeries/HvLpEvent.h>
48#include <asm/iSeries/HvLpConfig.h>
49#include <asm/iSeries/mf.h>
50#include <asm/iSeries/vio.h>
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 */
57static 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
66static 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 */
72static unsigned char event_buffer[VIO_MAX_SUBTYPES * 256] __page_aligned;
73static atomic_t event_buffer_available[VIO_MAX_SUBTYPES];
74static int event_buffer_initialised;
75
76static 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 */
83struct 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 */
94static u8 viomonseq = 22;
95
96/* Our hosting logical partition. We get this at startup
97 * time, and different modules access this variable directly.
98 */
99HvLpIndex viopath_hostLp = HvLpIndexInvalid;
100EXPORT_SYMBOL(viopath_hostLp);
101HvLpIndex viopath_ourLp = HvLpIndexInvalid;
102EXPORT_SYMBOL(viopath_ourLp);
103
104/* For each kind of incoming event we set a pointer to a
105 * routine to call.
106 */
107static 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
112static 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
120 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
121 if (!buf)
122 return 0;
123 memset(buf, 0, PAGE_SIZE);
124
125 handle = dma_map_single(iSeries_vio_dev, buf, PAGE_SIZE,
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,
135 ((u64)handle) << 32, PAGE_SIZE, 0, 0);
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
144 buf[PAGE_SIZE-1] = '\0';
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
156 dma_unmap_single(iSeries_vio_dev, handle, PAGE_SIZE, DMA_FROM_DEVICE);
157 kfree(buf);
158
159 return 0;
160}
161
162static int proc_viopath_open(struct inode *inode, struct file *file)
163{
164 return single_open(file, proc_viopath_show, NULL);
165}
166
167static struct file_operations proc_viopath_operations = {
168 .open = proc_viopath_open,
169 .read = seq_read,
170 .llseek = seq_lseek,
171 .release = single_release,
172};
173
174static int __init vio_proc_init(void)
175{
176 struct proc_dir_entry *e;
177
178 e = create_proc_entry("iSeries/config", 0, NULL);
179 if (e)
180 e->proc_fops = &proc_viopath_operations;
181
182 return 0;
183}
184__initcall(vio_proc_init);
185
186/* See if a given LP is active. Allow for invalid lps to be passed in
187 * and just return invalid
188 */
189int viopath_isactive(HvLpIndex lp)
190{
191 if (lp == HvLpIndexInvalid)
192 return 0;
193 if (lp < HVMAXARCHITECTEDLPS)
194 return viopathStatus[lp].isActive;
195 else
196 return 0;
197}
198EXPORT_SYMBOL(viopath_isactive);
199
200/*
201 * We cache the source and target instance ids for each
202 * partition.
203 */
204HvLpInstanceId viopath_sourceinst(HvLpIndex lp)
205{
206 return viopathStatus[lp].mSourceInst;
207}
208EXPORT_SYMBOL(viopath_sourceinst);
209
210HvLpInstanceId viopath_targetinst(HvLpIndex lp)
211{
212 return viopathStatus[lp].mTargetInst;
213}
214EXPORT_SYMBOL(viopath_targetinst);
215
216/*
217 * Send a monitor message. This is a message with the acknowledge
218 * bit on that the other side will NOT explicitly acknowledge. When
219 * the other side goes down, the hypervisor will acknowledge any
220 * outstanding messages....so we will know when the other side dies.
221 */
222static void sendMonMsg(HvLpIndex remoteLp)
223{
224 HvLpEvent_Rc hvrc;
225
226 viopathStatus[remoteLp].mSourceInst =
227 HvCallEvent_getSourceLpInstanceId(remoteLp,
228 HvLpEvent_Type_VirtualIo);
229 viopathStatus[remoteLp].mTargetInst =
230 HvCallEvent_getTargetLpInstanceId(remoteLp,
231 HvLpEvent_Type_VirtualIo);
232
233 /*
234 * Deliberately ignore the return code here. if we call this
235 * more than once, we don't care.
236 */
237 vio_setHandler(viomajorsubtype_monitor, handleMonitorEvent);
238
239 hvrc = HvCallEvent_signalLpEventFast(remoteLp, HvLpEvent_Type_VirtualIo,
240 viomajorsubtype_monitor, HvLpEvent_AckInd_DoAck,
241 HvLpEvent_AckType_DeferredAck,
242 viopathStatus[remoteLp].mSourceInst,
243 viopathStatus[remoteLp].mTargetInst,
244 viomonseq++, 0, 0, 0, 0, 0);
245
246 if (hvrc == HvLpEvent_Rc_Good)
247 viopathStatus[remoteLp].isActive = 1;
248 else {
249 printk(VIOPATH_KERN_WARN "could not connect to partition %d\n",
250 remoteLp);
251 viopathStatus[remoteLp].isActive = 0;
252 }
253}
254
255static void handleMonitorEvent(struct HvLpEvent *event)
256{
257 HvLpIndex remoteLp;
258 int i;
259
260 /*
261 * This handler is _also_ called as part of the loop
262 * at the end of this routine, so it must be able to
263 * ignore NULL events...
264 */
265 if (!event)
266 return;
267
268 /*
269 * First see if this is just a normal monitor message from the
270 * other partition
271 */
272 if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
273 remoteLp = event->xSourceLp;
274 if (!viopathStatus[remoteLp].isActive)
275 sendMonMsg(remoteLp);
276 return;
277 }
278
279 /*
280 * This path is for an acknowledgement; the other partition
281 * died
282 */
283 remoteLp = event->xTargetLp;
284 if ((event->xSourceInstanceId != viopathStatus[remoteLp].mSourceInst) ||
285 (event->xTargetInstanceId != viopathStatus[remoteLp].mTargetInst)) {
286 printk(VIOPATH_KERN_WARN "ignoring ack....mismatched instances\n");
287 return;
288 }
289
290 printk(VIOPATH_KERN_WARN "partition %d ended\n", remoteLp);
291
292 viopathStatus[remoteLp].isActive = 0;
293
294 /*
295 * For each active handler, pass them a NULL
296 * message to indicate that the other partition
297 * died
298 */
299 for (i = 0; i < VIO_MAX_SUBTYPES; i++) {
300 if (vio_handler[i] != NULL)
301 (*vio_handler[i])(NULL);
302 }
303}
304
305int vio_setHandler(int subtype, vio_event_handler_t *beh)
306{
307 subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
308 if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
309 return -EINVAL;
310 if (vio_handler[subtype] != NULL)
311 return -EBUSY;
312 vio_handler[subtype] = beh;
313 return 0;
314}
315EXPORT_SYMBOL(vio_setHandler);
316
317int vio_clearHandler(int subtype)
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 -EAGAIN;
324 vio_handler[subtype] = NULL;
325 return 0;
326}
327EXPORT_SYMBOL(vio_clearHandler);
328
329static void handleConfig(struct HvLpEvent *event)
330{
331 if (!event)
332 return;
333 if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
334 printk(VIOPATH_KERN_WARN
335 "unexpected config request from partition %d",
336 event->xSourceLp);
337
338 if ((event->xFlags.xFunction == HvLpEvent_Function_Int) &&
339 (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) {
340 event->xRc = HvLpEvent_Rc_InvalidSubtype;
341 HvCallEvent_ackLpEvent(event);
342 }
343 return;
344 }
345
346 up((struct semaphore *)event->xCorrelationToken);
347}
348
349/*
350 * Initialization of the hosting partition
351 */
352void vio_set_hostlp(void)
353{
354 /*
355 * If this has already been set then we DON'T want to either change
356 * it or re-register the proc file system
357 */
358 if (viopath_hostLp != HvLpIndexInvalid)
359 return;
360
361 /*
362 * Figure out our hosting partition. This isn't allowed to change
363 * while we're active
364 */
365 viopath_ourLp = HvLpConfig_getLpIndex();
366 viopath_hostLp = HvLpConfig_getHostingLpIndex(viopath_ourLp);
367
368 if (viopath_hostLp != HvLpIndexInvalid)
369 vio_setHandler(viomajorsubtype_config, handleConfig);
370}
371EXPORT_SYMBOL(vio_set_hostlp);
372
373static void vio_handleEvent(struct HvLpEvent *event, struct pt_regs *regs)
374{
375 HvLpIndex remoteLp;
376 int subtype = (event->xSubtype & VIOMAJOR_SUBTYPE_MASK)
377 >> VIOMAJOR_SUBTYPE_SHIFT;
378
379 if (event->xFlags.xFunction == HvLpEvent_Function_Int) {
380 remoteLp = event->xSourceLp;
381 /*
382 * The isActive is checked because if the hosting partition
383 * went down and came back up it would not be active but it
384 * would have different source and target instances, in which
385 * case we'd want to reset them. This case really protects
386 * against an unauthorized active partition sending interrupts
387 * or acks to this linux partition.
388 */
389 if (viopathStatus[remoteLp].isActive
390 && (event->xSourceInstanceId !=
391 viopathStatus[remoteLp].mTargetInst)) {
392 printk(VIOPATH_KERN_WARN
393 "message from invalid partition. "
394 "int msg rcvd, source inst (%d) doesnt match (%d)\n",
395 viopathStatus[remoteLp].mTargetInst,
396 event->xSourceInstanceId);
397 return;
398 }
399
400 if (viopathStatus[remoteLp].isActive
401 && (event->xTargetInstanceId !=
402 viopathStatus[remoteLp].mSourceInst)) {
403 printk(VIOPATH_KERN_WARN
404 "message from invalid partition. "
405 "int msg rcvd, target inst (%d) doesnt match (%d)\n",
406 viopathStatus[remoteLp].mSourceInst,
407 event->xTargetInstanceId);
408 return;
409 }
410 } else {
411 remoteLp = event->xTargetLp;
412 if (event->xSourceInstanceId !=
413 viopathStatus[remoteLp].mSourceInst) {
414 printk(VIOPATH_KERN_WARN
415 "message from invalid partition. "
416 "ack msg rcvd, source inst (%d) doesnt match (%d)\n",
417 viopathStatus[remoteLp].mSourceInst,
418 event->xSourceInstanceId);
419 return;
420 }
421
422 if (event->xTargetInstanceId !=
423 viopathStatus[remoteLp].mTargetInst) {
424 printk(VIOPATH_KERN_WARN
425 "message from invalid partition. "
426 "viopath: ack msg rcvd, target inst (%d) doesnt match (%d)\n",
427 viopathStatus[remoteLp].mTargetInst,
428 event->xTargetInstanceId);
429 return;
430 }
431 }
432
433 if (vio_handler[subtype] == NULL) {
434 printk(VIOPATH_KERN_WARN
435 "unexpected virtual io event subtype %d from partition %d\n",
436 event->xSubtype, remoteLp);
437 /* No handler. Ack if necessary */
438 if ((event->xFlags.xFunction == HvLpEvent_Function_Int) &&
439 (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck)) {
440 event->xRc = HvLpEvent_Rc_InvalidSubtype;
441 HvCallEvent_ackLpEvent(event);
442 }
443 return;
444 }
445
446 /* This innocuous little line is where all the real work happens */
447 (*vio_handler[subtype])(event);
448}
449
450static void viopath_donealloc(void *parm, int number)
451{
452 struct alloc_parms *parmsp = parm;
453
454 parmsp->number = number;
455 if (parmsp->used_wait_atomic)
456 atomic_set(&parmsp->wait_atomic, 0);
457 else
458 up(&parmsp->sem);
459}
460
461static int allocateEvents(HvLpIndex remoteLp, int numEvents)
462{
463 struct alloc_parms parms;
464
465 if (system_state != SYSTEM_RUNNING) {
466 parms.used_wait_atomic = 1;
467 atomic_set(&parms.wait_atomic, 1);
468 } else {
469 parms.used_wait_atomic = 0;
470 init_MUTEX_LOCKED(&parms.sem);
471 }
472 mf_allocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo, 250, /* It would be nice to put a real number here! */
473 numEvents, &viopath_donealloc, &parms);
474 if (system_state != SYSTEM_RUNNING) {
475 while (atomic_read(&parms.wait_atomic))
476 mb();
477 } else
478 down(&parms.sem);
479 return parms.number;
480}
481
482int viopath_open(HvLpIndex remoteLp, int subtype, int numReq)
483{
484 int i;
485 unsigned long flags;
486 int tempNumAllocated;
487
488 if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid))
489 return -EINVAL;
490
491 subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
492 if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
493 return -EINVAL;
494
495 spin_lock_irqsave(&statuslock, flags);
496
497 if (!event_buffer_initialised) {
498 for (i = 0; i < VIO_MAX_SUBTYPES; i++)
499 atomic_set(&event_buffer_available[i], 1);
500 event_buffer_initialised = 1;
501 }
502
503 viopathStatus[remoteLp].users[subtype]++;
504
505 if (!viopathStatus[remoteLp].isOpen) {
506 viopathStatus[remoteLp].isOpen = 1;
507 HvCallEvent_openLpEventPath(remoteLp, HvLpEvent_Type_VirtualIo);
508
509 /*
510 * Don't hold the spinlock during an operation that
511 * can sleep.
512 */
513 spin_unlock_irqrestore(&statuslock, flags);
514 tempNumAllocated = allocateEvents(remoteLp, 1);
515 spin_lock_irqsave(&statuslock, flags);
516
517 viopathStatus[remoteLp].numberAllocated += tempNumAllocated;
518
519 if (viopathStatus[remoteLp].numberAllocated == 0) {
520 HvCallEvent_closeLpEventPath(remoteLp,
521 HvLpEvent_Type_VirtualIo);
522
523 spin_unlock_irqrestore(&statuslock, flags);
524 return -ENOMEM;
525 }
526
527 viopathStatus[remoteLp].mSourceInst =
528 HvCallEvent_getSourceLpInstanceId(remoteLp,
529 HvLpEvent_Type_VirtualIo);
530 viopathStatus[remoteLp].mTargetInst =
531 HvCallEvent_getTargetLpInstanceId(remoteLp,
532 HvLpEvent_Type_VirtualIo);
533 HvLpEvent_registerHandler(HvLpEvent_Type_VirtualIo,
534 &vio_handleEvent);
535 sendMonMsg(remoteLp);
536 printk(VIOPATH_KERN_INFO "opening connection to partition %d, "
537 "setting sinst %d, tinst %d\n",
538 remoteLp, viopathStatus[remoteLp].mSourceInst,
539 viopathStatus[remoteLp].mTargetInst);
540 }
541
542 spin_unlock_irqrestore(&statuslock, flags);
543 tempNumAllocated = allocateEvents(remoteLp, numReq);
544 spin_lock_irqsave(&statuslock, flags);
545 viopathStatus[remoteLp].numberAllocated += tempNumAllocated;
546 spin_unlock_irqrestore(&statuslock, flags);
547
548 return 0;
549}
550EXPORT_SYMBOL(viopath_open);
551
552int viopath_close(HvLpIndex remoteLp, int subtype, int numReq)
553{
554 unsigned long flags;
555 int i;
556 int numOpen;
557 struct alloc_parms parms;
558
559 if ((remoteLp >= HVMAXARCHITECTEDLPS) || (remoteLp == HvLpIndexInvalid))
560 return -EINVAL;
561
562 subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
563 if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
564 return -EINVAL;
565
566 spin_lock_irqsave(&statuslock, flags);
567 /*
568 * If the viopath_close somehow gets called before a
569 * viopath_open it could decrement to -1 which is a non
570 * recoverable state so we'll prevent this from
571 * happening.
572 */
573 if (viopathStatus[remoteLp].users[subtype] > 0)
574 viopathStatus[remoteLp].users[subtype]--;
575
576 spin_unlock_irqrestore(&statuslock, flags);
577
578 parms.used_wait_atomic = 0;
579 init_MUTEX_LOCKED(&parms.sem);
580 mf_deallocate_lp_events(remoteLp, HvLpEvent_Type_VirtualIo,
581 numReq, &viopath_donealloc, &parms);
582 down(&parms.sem);
583
584 spin_lock_irqsave(&statuslock, flags);
585 for (i = 0, numOpen = 0; i < VIO_MAX_SUBTYPES; i++)
586 numOpen += viopathStatus[remoteLp].users[i];
587
588 if ((viopathStatus[remoteLp].isOpen) && (numOpen == 0)) {
589 printk(VIOPATH_KERN_INFO "closing connection to partition %d",
590 remoteLp);
591
592 HvCallEvent_closeLpEventPath(remoteLp,
593 HvLpEvent_Type_VirtualIo);
594 viopathStatus[remoteLp].isOpen = 0;
595 viopathStatus[remoteLp].isActive = 0;
596
597 for (i = 0; i < VIO_MAX_SUBTYPES; i++)
598 atomic_set(&event_buffer_available[i], 0);
599 event_buffer_initialised = 0;
600 }
601 spin_unlock_irqrestore(&statuslock, flags);
602 return 0;
603}
604EXPORT_SYMBOL(viopath_close);
605
606void *vio_get_event_buffer(int subtype)
607{
608 subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
609 if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES))
610 return NULL;
611
612 if (atomic_dec_if_positive(&event_buffer_available[subtype]) == 0)
613 return &event_buffer[subtype * 256];
614 else
615 return NULL;
616}
617EXPORT_SYMBOL(vio_get_event_buffer);
618
619void vio_free_event_buffer(int subtype, void *buffer)
620{
621 subtype = subtype >> VIOMAJOR_SUBTYPE_SHIFT;
622 if ((subtype < 0) || (subtype >= VIO_MAX_SUBTYPES)) {
623 printk(VIOPATH_KERN_WARN
624 "unexpected subtype %d freeing event buffer\n", subtype);
625 return;
626 }
627
628 if (atomic_read(&event_buffer_available[subtype]) != 0) {
629 printk(VIOPATH_KERN_WARN
630 "freeing unallocated event buffer, subtype %d\n",
631 subtype);
632 return;
633 }
634
635 if (buffer != &event_buffer[subtype * 256]) {
636 printk(VIOPATH_KERN_WARN
637 "freeing invalid event buffer, subtype %d\n", subtype);
638 }
639
640 atomic_set(&event_buffer_available[subtype], 1);
641}
642EXPORT_SYMBOL(vio_free_event_buffer);
643
644static const struct vio_error_entry vio_no_error =
645 { 0, 0, "Non-VIO Error" };
646static const struct vio_error_entry vio_unknown_error =
647 { 0, EIO, "Unknown Error" };
648
649static const struct vio_error_entry vio_default_errors[] = {
650 {0x0001, EIO, "No Connection"},
651 {0x0002, EIO, "No Receiver"},
652 {0x0003, EIO, "No Buffer Available"},
653 {0x0004, EBADRQC, "Invalid Message Type"},
654 {0x0000, 0, NULL},
655};
656
657const struct vio_error_entry *vio_lookup_rc(
658 const struct vio_error_entry *local_table, u16 rc)
659{
660 const struct vio_error_entry *cur;
661
662 if (!rc)
663 return &vio_no_error;
664 if (local_table)
665 for (cur = local_table; cur->rc; ++cur)
666 if (cur->rc == rc)
667 return cur;
668 for (cur = vio_default_errors; cur->rc; ++cur)
669 if (cur->rc == rc)
670 return cur;
671 return &vio_unknown_error;
672}
673EXPORT_SYMBOL(vio_lookup_rc);
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