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authorPaul Mackerras <paulus@samba.org>2005-11-17 23:43:34 -0500
committerPaul Mackerras <paulus@samba.org>2005-11-17 23:43:34 -0500
commit437a58db57c61385baaa1cb8b7fa590b6a2f1607 (patch)
tree3b25862dccdfd891b0d8582ff7b98b1db9f197f7 /arch/ppc64/kernel
parentf62859bb6871c5e4a8e591c60befc8caaf54db8c (diff)
powerpc: Move remaining .c files from arch/ppc64 to arch/powerpc
This also deletes the now-unused Makefiles under arch/ppc64. Both of the files moved over could use some merging, but for now I have moved them as-is and arranged for them to be used only in 64-bit kernels. For 32-bit kernels we still use arch/ppc/kernel/idle.c and drivers/char/generic_nvram.c as before. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc64/kernel')
-rw-r--r--arch/ppc64/kernel/Makefile7
-rw-r--r--arch/ppc64/kernel/idle.c121
-rw-r--r--arch/ppc64/kernel/nvram.c742
3 files changed, 0 insertions, 870 deletions
diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
deleted file mode 100644
index 5f0abdb66e0b..000000000000
--- a/arch/ppc64/kernel/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
1#
2# Makefile for the linux ppc64 kernel.
3#
4
5obj-y += idle.o
6
7obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o
diff --git a/arch/ppc64/kernel/idle.c b/arch/ppc64/kernel/idle.c
deleted file mode 100644
index b879d3057ef8..000000000000
--- a/arch/ppc64/kernel/idle.c
+++ /dev/null
@@ -1,121 +0,0 @@
1/*
2 * Idle daemon for PowerPC. Idle daemon will handle any action
3 * that needs to be taken when the system becomes idle.
4 *
5 * Originally Written by Cort Dougan (cort@cs.nmt.edu)
6 *
7 * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com>
8 *
9 * Additional shared processor, SMT, and firmware support
10 * Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.com>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18#include <linux/config.h>
19#include <linux/sched.h>
20#include <linux/kernel.h>
21#include <linux/smp.h>
22#include <linux/cpu.h>
23#include <linux/sysctl.h>
24
25#include <asm/system.h>
26#include <asm/processor.h>
27#include <asm/cputable.h>
28#include <asm/time.h>
29#include <asm/machdep.h>
30#include <asm/smp.h>
31
32extern void power4_idle(void);
33
34void default_idle(void)
35{
36 unsigned int cpu = smp_processor_id();
37 set_thread_flag(TIF_POLLING_NRFLAG);
38
39 while (1) {
40 if (!need_resched()) {
41 while (!need_resched() && !cpu_is_offline(cpu)) {
42 ppc64_runlatch_off();
43
44 /*
45 * Go into low thread priority and possibly
46 * low power mode.
47 */
48 HMT_low();
49 HMT_very_low();
50 }
51
52 HMT_medium();
53 }
54
55 ppc64_runlatch_on();
56 preempt_enable_no_resched();
57 schedule();
58 preempt_disable();
59 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
60 cpu_die();
61 }
62}
63
64void native_idle(void)
65{
66 while (1) {
67 ppc64_runlatch_off();
68
69 if (!need_resched())
70 power4_idle();
71
72 if (need_resched()) {
73 ppc64_runlatch_on();
74 preempt_enable_no_resched();
75 schedule();
76 preempt_disable();
77 }
78
79 if (cpu_is_offline(smp_processor_id()) &&
80 system_state == SYSTEM_RUNNING)
81 cpu_die();
82 }
83}
84
85void cpu_idle(void)
86{
87 BUG_ON(NULL == ppc_md.idle_loop);
88 ppc_md.idle_loop();
89}
90
91int powersave_nap;
92
93#ifdef CONFIG_SYSCTL
94/*
95 * Register the sysctl to set/clear powersave_nap.
96 */
97static ctl_table powersave_nap_ctl_table[]={
98 {
99 .ctl_name = KERN_PPC_POWERSAVE_NAP,
100 .procname = "powersave-nap",
101 .data = &powersave_nap,
102 .maxlen = sizeof(int),
103 .mode = 0644,
104 .proc_handler = &proc_dointvec,
105 },
106 { 0, },
107};
108static ctl_table powersave_nap_sysctl_root[] = {
109 { 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, },
110 { 0,},
111};
112
113static int __init
114register_powersave_nap_sysctl(void)
115{
116 register_sysctl_table(powersave_nap_sysctl_root, 0);
117
118 return 0;
119}
120__initcall(register_powersave_nap_sysctl);
121#endif
diff --git a/arch/ppc64/kernel/nvram.c b/arch/ppc64/kernel/nvram.c
deleted file mode 100644
index c0fcd29918ce..000000000000
--- a/arch/ppc64/kernel/nvram.c
+++ /dev/null
@@ -1,742 +0,0 @@
1/*
2 * c 2001 PPC 64 Team, IBM Corp
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * /dev/nvram driver for PPC64
10 *
11 * This perhaps should live in drivers/char
12 *
13 * TODO: Split the /dev/nvram part (that one can use
14 * drivers/char/generic_nvram.c) from the arch & partition
15 * parsing code.
16 */
17
18#include <linux/module.h>
19
20#include <linux/types.h>
21#include <linux/errno.h>
22#include <linux/fs.h>
23#include <linux/miscdevice.h>
24#include <linux/fcntl.h>
25#include <linux/nvram.h>
26#include <linux/init.h>
27#include <linux/slab.h>
28#include <linux/spinlock.h>
29#include <asm/uaccess.h>
30#include <asm/nvram.h>
31#include <asm/rtas.h>
32#include <asm/prom.h>
33#include <asm/machdep.h>
34
35#undef DEBUG_NVRAM
36
37static int nvram_scan_partitions(void);
38static int nvram_setup_partition(void);
39static int nvram_create_os_partition(void);
40static int nvram_remove_os_partition(void);
41
42static struct nvram_partition * nvram_part;
43static long nvram_error_log_index = -1;
44static long nvram_error_log_size = 0;
45
46int no_logging = 1; /* Until we initialize everything,
47 * make sure we don't try logging
48 * anything */
49
50extern volatile int error_log_cnt;
51
52struct err_log_info {
53 int error_type;
54 unsigned int seq_num;
55};
56
57static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
58{
59 int size;
60
61 if (ppc_md.nvram_size == NULL)
62 return -ENODEV;
63 size = ppc_md.nvram_size();
64
65 switch (origin) {
66 case 1:
67 offset += file->f_pos;
68 break;
69 case 2:
70 offset += size;
71 break;
72 }
73 if (offset < 0)
74 return -EINVAL;
75 file->f_pos = offset;
76 return file->f_pos;
77}
78
79
80static ssize_t dev_nvram_read(struct file *file, char __user *buf,
81 size_t count, loff_t *ppos)
82{
83 ssize_t len;
84 char *tmp_buffer;
85 int size;
86
87 if (ppc_md.nvram_size == NULL)
88 return -ENODEV;
89 size = ppc_md.nvram_size();
90
91 if (!access_ok(VERIFY_WRITE, buf, count))
92 return -EFAULT;
93 if (*ppos >= size)
94 return 0;
95 if (count > size)
96 count = size;
97
98 tmp_buffer = (char *) kmalloc(count, GFP_KERNEL);
99 if (!tmp_buffer) {
100 printk(KERN_ERR "dev_read_nvram: kmalloc failed\n");
101 return -ENOMEM;
102 }
103
104 len = ppc_md.nvram_read(tmp_buffer, count, ppos);
105 if ((long)len <= 0) {
106 kfree(tmp_buffer);
107 return len;
108 }
109
110 if (copy_to_user(buf, tmp_buffer, len)) {
111 kfree(tmp_buffer);
112 return -EFAULT;
113 }
114
115 kfree(tmp_buffer);
116 return len;
117
118}
119
120static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
121 size_t count, loff_t *ppos)
122{
123 ssize_t len;
124 char * tmp_buffer;
125 int size;
126
127 if (ppc_md.nvram_size == NULL)
128 return -ENODEV;
129 size = ppc_md.nvram_size();
130
131 if (!access_ok(VERIFY_READ, buf, count))
132 return -EFAULT;
133 if (*ppos >= size)
134 return 0;
135 if (count > size)
136 count = size;
137
138 tmp_buffer = (char *) kmalloc(count, GFP_KERNEL);
139 if (!tmp_buffer) {
140 printk(KERN_ERR "dev_nvram_write: kmalloc failed\n");
141 return -ENOMEM;
142 }
143
144 if (copy_from_user(tmp_buffer, buf, count)) {
145 kfree(tmp_buffer);
146 return -EFAULT;
147 }
148
149 len = ppc_md.nvram_write(tmp_buffer, count, ppos);
150 if ((long)len <= 0) {
151 kfree(tmp_buffer);
152 return len;
153 }
154
155 kfree(tmp_buffer);
156 return len;
157}
158
159static int dev_nvram_ioctl(struct inode *inode, struct file *file,
160 unsigned int cmd, unsigned long arg)
161{
162 switch(cmd) {
163#ifdef CONFIG_PPC_PMAC
164 case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
165 printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
166 case IOC_NVRAM_GET_OFFSET: {
167 int part, offset;
168
169 if (_machine != PLATFORM_POWERMAC)
170 return -EINVAL;
171 if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
172 return -EFAULT;
173 if (part < pmac_nvram_OF || part > pmac_nvram_NR)
174 return -EINVAL;
175 offset = pmac_get_partition(part);
176 if (offset < 0)
177 return offset;
178 if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
179 return -EFAULT;
180 return 0;
181 }
182#endif /* CONFIG_PPC_PMAC */
183 }
184 return -EINVAL;
185}
186
187struct file_operations nvram_fops = {
188 .owner = THIS_MODULE,
189 .llseek = dev_nvram_llseek,
190 .read = dev_nvram_read,
191 .write = dev_nvram_write,
192 .ioctl = dev_nvram_ioctl,
193};
194
195static struct miscdevice nvram_dev = {
196 NVRAM_MINOR,
197 "nvram",
198 &nvram_fops
199};
200
201
202#ifdef DEBUG_NVRAM
203static void nvram_print_partitions(char * label)
204{
205 struct list_head * p;
206 struct nvram_partition * tmp_part;
207
208 printk(KERN_WARNING "--------%s---------\n", label);
209 printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
210 list_for_each(p, &nvram_part->partition) {
211 tmp_part = list_entry(p, struct nvram_partition, partition);
212 printk(KERN_WARNING "%d \t%02x\t%02x\t%d\t%s\n",
213 tmp_part->index, tmp_part->header.signature,
214 tmp_part->header.checksum, tmp_part->header.length,
215 tmp_part->header.name);
216 }
217}
218#endif
219
220
221static int nvram_write_header(struct nvram_partition * part)
222{
223 loff_t tmp_index;
224 int rc;
225
226 tmp_index = part->index;
227 rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index);
228
229 return rc;
230}
231
232
233static unsigned char nvram_checksum(struct nvram_header *p)
234{
235 unsigned int c_sum, c_sum2;
236 unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */
237 c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];
238
239 /* The sum may have spilled into the 3rd byte. Fold it back. */
240 c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff;
241 /* The sum cannot exceed 2 bytes. Fold it into a checksum */
242 c_sum2 = (c_sum >> 8) + (c_sum << 8);
243 c_sum = ((c_sum + c_sum2) >> 8) & 0xff;
244 return c_sum;
245}
246
247
248/*
249 * Find an nvram partition, sig can be 0 for any
250 * partition or name can be NULL for any name, else
251 * tries to match both
252 */
253struct nvram_partition *nvram_find_partition(int sig, const char *name)
254{
255 struct nvram_partition * part;
256 struct list_head * p;
257
258 list_for_each(p, &nvram_part->partition) {
259 part = list_entry(p, struct nvram_partition, partition);
260
261 if (sig && part->header.signature != sig)
262 continue;
263 if (name && 0 != strncmp(name, part->header.name, 12))
264 continue;
265 return part;
266 }
267 return NULL;
268}
269EXPORT_SYMBOL(nvram_find_partition);
270
271
272static int nvram_remove_os_partition(void)
273{
274 struct list_head *i;
275 struct list_head *j;
276 struct nvram_partition * part;
277 struct nvram_partition * cur_part;
278 int rc;
279
280 list_for_each(i, &nvram_part->partition) {
281 part = list_entry(i, struct nvram_partition, partition);
282 if (part->header.signature != NVRAM_SIG_OS)
283 continue;
284
285 /* Make os partition a free partition */
286 part->header.signature = NVRAM_SIG_FREE;
287 sprintf(part->header.name, "wwwwwwwwwwww");
288 part->header.checksum = nvram_checksum(&part->header);
289
290 /* Merge contiguous free partitions backwards */
291 list_for_each_prev(j, &part->partition) {
292 cur_part = list_entry(j, struct nvram_partition, partition);
293 if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
294 break;
295 }
296
297 part->header.length += cur_part->header.length;
298 part->header.checksum = nvram_checksum(&part->header);
299 part->index = cur_part->index;
300
301 list_del(&cur_part->partition);
302 kfree(cur_part);
303 j = &part->partition; /* fixup our loop */
304 }
305
306 /* Merge contiguous free partitions forwards */
307 list_for_each(j, &part->partition) {
308 cur_part = list_entry(j, struct nvram_partition, partition);
309 if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
310 break;
311 }
312
313 part->header.length += cur_part->header.length;
314 part->header.checksum = nvram_checksum(&part->header);
315
316 list_del(&cur_part->partition);
317 kfree(cur_part);
318 j = &part->partition; /* fixup our loop */
319 }
320
321 rc = nvram_write_header(part);
322 if (rc <= 0) {
323 printk(KERN_ERR "nvram_remove_os_partition: nvram_write failed (%d)\n", rc);
324 return rc;
325 }
326
327 }
328
329 return 0;
330}
331
332/* nvram_create_os_partition
333 *
334 * Create a OS linux partition to buffer error logs.
335 * Will create a partition starting at the first free
336 * space found if space has enough room.
337 */
338static int nvram_create_os_partition(void)
339{
340 struct nvram_partition *part;
341 struct nvram_partition *new_part;
342 struct nvram_partition *free_part = NULL;
343 int seq_init[2] = { 0, 0 };
344 loff_t tmp_index;
345 long size = 0;
346 int rc;
347
348 /* Find a free partition that will give us the maximum needed size
349 If can't find one that will give us the minimum size needed */
350 list_for_each_entry(part, &nvram_part->partition, partition) {
351 if (part->header.signature != NVRAM_SIG_FREE)
352 continue;
353
354 if (part->header.length >= NVRAM_MAX_REQ) {
355 size = NVRAM_MAX_REQ;
356 free_part = part;
357 break;
358 }
359 if (!size && part->header.length >= NVRAM_MIN_REQ) {
360 size = NVRAM_MIN_REQ;
361 free_part = part;
362 }
363 }
364 if (!size)
365 return -ENOSPC;
366
367 /* Create our OS partition */
368 new_part = kmalloc(sizeof(*new_part), GFP_KERNEL);
369 if (!new_part) {
370 printk(KERN_ERR "nvram_create_os_partition: kmalloc failed\n");
371 return -ENOMEM;
372 }
373
374 new_part->index = free_part->index;
375 new_part->header.signature = NVRAM_SIG_OS;
376 new_part->header.length = size;
377 strcpy(new_part->header.name, "ppc64,linux");
378 new_part->header.checksum = nvram_checksum(&new_part->header);
379
380 rc = nvram_write_header(new_part);
381 if (rc <= 0) {
382 printk(KERN_ERR "nvram_create_os_partition: nvram_write_header \
383 failed (%d)\n", rc);
384 return rc;
385 }
386
387 /* make sure and initialize to zero the sequence number and the error
388 type logged */
389 tmp_index = new_part->index + NVRAM_HEADER_LEN;
390 rc = ppc_md.nvram_write((char *)&seq_init, sizeof(seq_init), &tmp_index);
391 if (rc <= 0) {
392 printk(KERN_ERR "nvram_create_os_partition: nvram_write "
393 "failed (%d)\n", rc);
394 return rc;
395 }
396
397 nvram_error_log_index = new_part->index + NVRAM_HEADER_LEN;
398 nvram_error_log_size = ((part->header.length - 1) *
399 NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
400
401 list_add_tail(&new_part->partition, &free_part->partition);
402
403 if (free_part->header.length <= size) {
404 list_del(&free_part->partition);
405 kfree(free_part);
406 return 0;
407 }
408
409 /* Adjust the partition we stole the space from */
410 free_part->index += size * NVRAM_BLOCK_LEN;
411 free_part->header.length -= size;
412 free_part->header.checksum = nvram_checksum(&free_part->header);
413
414 rc = nvram_write_header(free_part);
415 if (rc <= 0) {
416 printk(KERN_ERR "nvram_create_os_partition: nvram_write_header "
417 "failed (%d)\n", rc);
418 return rc;
419 }
420
421 return 0;
422}
423
424
425/* nvram_setup_partition
426 *
427 * This will setup the partition we need for buffering the
428 * error logs and cleanup partitions if needed.
429 *
430 * The general strategy is the following:
431 * 1.) If there is ppc64,linux partition large enough then use it.
432 * 2.) If there is not a ppc64,linux partition large enough, search
433 * for a free partition that is large enough.
434 * 3.) If there is not a free partition large enough remove
435 * _all_ OS partitions and consolidate the space.
436 * 4.) Will first try getting a chunk that will satisfy the maximum
437 * error log size (NVRAM_MAX_REQ).
438 * 5.) If the max chunk cannot be allocated then try finding a chunk
439 * that will satisfy the minum needed (NVRAM_MIN_REQ).
440 */
441static int nvram_setup_partition(void)
442{
443 struct list_head * p;
444 struct nvram_partition * part;
445 int rc;
446
447 /* For now, we don't do any of this on pmac, until I
448 * have figured out if it's worth killing some unused stuffs
449 * in our nvram, as Apple defined partitions use pretty much
450 * all of the space
451 */
452 if (_machine == PLATFORM_POWERMAC)
453 return -ENOSPC;
454
455 /* see if we have an OS partition that meets our needs.
456 will try getting the max we need. If not we'll delete
457 partitions and try again. */
458 list_for_each(p, &nvram_part->partition) {
459 part = list_entry(p, struct nvram_partition, partition);
460 if (part->header.signature != NVRAM_SIG_OS)
461 continue;
462
463 if (strcmp(part->header.name, "ppc64,linux"))
464 continue;
465
466 if (part->header.length >= NVRAM_MIN_REQ) {
467 /* found our partition */
468 nvram_error_log_index = part->index + NVRAM_HEADER_LEN;
469 nvram_error_log_size = ((part->header.length - 1) *
470 NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
471 return 0;
472 }
473 }
474
475 /* try creating a partition with the free space we have */
476 rc = nvram_create_os_partition();
477 if (!rc) {
478 return 0;
479 }
480
481 /* need to free up some space */
482 rc = nvram_remove_os_partition();
483 if (rc) {
484 return rc;
485 }
486
487 /* create a partition in this new space */
488 rc = nvram_create_os_partition();
489 if (rc) {
490 printk(KERN_ERR "nvram_create_os_partition: Could not find a "
491 "NVRAM partition large enough\n");
492 return rc;
493 }
494
495 return 0;
496}
497
498
499static int nvram_scan_partitions(void)
500{
501 loff_t cur_index = 0;
502 struct nvram_header phead;
503 struct nvram_partition * tmp_part;
504 unsigned char c_sum;
505 char * header;
506 int total_size;
507 int err;
508
509 if (ppc_md.nvram_size == NULL)
510 return -ENODEV;
511 total_size = ppc_md.nvram_size();
512
513 header = (char *) kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL);
514 if (!header) {
515 printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n");
516 return -ENOMEM;
517 }
518
519 while (cur_index < total_size) {
520
521 err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index);
522 if (err != NVRAM_HEADER_LEN) {
523 printk(KERN_ERR "nvram_scan_partitions: Error parsing "
524 "nvram partitions\n");
525 goto out;
526 }
527
528 cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */
529
530 memcpy(&phead, header, NVRAM_HEADER_LEN);
531
532 err = 0;
533 c_sum = nvram_checksum(&phead);
534 if (c_sum != phead.checksum) {
535 printk(KERN_WARNING "WARNING: nvram partition checksum"
536 " was %02x, should be %02x!\n",
537 phead.checksum, c_sum);
538 printk(KERN_WARNING "Terminating nvram partition scan\n");
539 goto out;
540 }
541 if (!phead.length) {
542 printk(KERN_WARNING "WARNING: nvram corruption "
543 "detected: 0-length partition\n");
544 goto out;
545 }
546 tmp_part = (struct nvram_partition *)
547 kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
548 err = -ENOMEM;
549 if (!tmp_part) {
550 printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");
551 goto out;
552 }
553
554 memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);
555 tmp_part->index = cur_index;
556 list_add_tail(&tmp_part->partition, &nvram_part->partition);
557
558 cur_index += phead.length * NVRAM_BLOCK_LEN;
559 }
560 err = 0;
561
562 out:
563 kfree(header);
564 return err;
565}
566
567static int __init nvram_init(void)
568{
569 int error;
570 int rc;
571
572 if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
573 return -ENODEV;
574
575 rc = misc_register(&nvram_dev);
576 if (rc != 0) {
577 printk(KERN_ERR "nvram_init: failed to register device\n");
578 return rc;
579 }
580
581 /* initialize our anchor for the nvram partition list */
582 nvram_part = (struct nvram_partition *) kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
583 if (!nvram_part) {
584 printk(KERN_ERR "nvram_init: Failed kmalloc\n");
585 return -ENOMEM;
586 }
587 INIT_LIST_HEAD(&nvram_part->partition);
588
589 /* Get all the NVRAM partitions */
590 error = nvram_scan_partitions();
591 if (error) {
592 printk(KERN_ERR "nvram_init: Failed nvram_scan_partitions\n");
593 return error;
594 }
595
596 if(nvram_setup_partition())
597 printk(KERN_WARNING "nvram_init: Could not find nvram partition"
598 " for nvram buffered error logging.\n");
599
600#ifdef DEBUG_NVRAM
601 nvram_print_partitions("NVRAM Partitions");
602#endif
603
604 return rc;
605}
606
607void __exit nvram_cleanup(void)
608{
609 misc_deregister( &nvram_dev );
610}
611
612
613#ifdef CONFIG_PPC_PSERIES
614
615/* nvram_write_error_log
616 *
617 * We need to buffer the error logs into nvram to ensure that we have
618 * the failure information to decode. If we have a severe error there
619 * is no way to guarantee that the OS or the machine is in a state to
620 * get back to user land and write the error to disk. For example if
621 * the SCSI device driver causes a Machine Check by writing to a bad
622 * IO address, there is no way of guaranteeing that the device driver
623 * is in any state that is would also be able to write the error data
624 * captured to disk, thus we buffer it in NVRAM for analysis on the
625 * next boot.
626 *
627 * In NVRAM the partition containing the error log buffer will looks like:
628 * Header (in bytes):
629 * +-----------+----------+--------+------------+------------------+
630 * | signature | checksum | length | name | data |
631 * |0 |1 |2 3|4 15|16 length-1|
632 * +-----------+----------+--------+------------+------------------+
633 *
634 * The 'data' section would look like (in bytes):
635 * +--------------+------------+-----------------------------------+
636 * | event_logged | sequence # | error log |
637 * |0 3|4 7|8 nvram_error_log_size-1|
638 * +--------------+------------+-----------------------------------+
639 *
640 * event_logged: 0 if event has not been logged to syslog, 1 if it has
641 * sequence #: The unique sequence # for each event. (until it wraps)
642 * error log: The error log from event_scan
643 */
644int nvram_write_error_log(char * buff, int length, unsigned int err_type)
645{
646 int rc;
647 loff_t tmp_index;
648 struct err_log_info info;
649
650 if (no_logging) {
651 return -EPERM;
652 }
653
654 if (nvram_error_log_index == -1) {
655 return -ESPIPE;
656 }
657
658 if (length > nvram_error_log_size) {
659 length = nvram_error_log_size;
660 }
661
662 info.error_type = err_type;
663 info.seq_num = error_log_cnt;
664
665 tmp_index = nvram_error_log_index;
666
667 rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index);
668 if (rc <= 0) {
669 printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
670 return rc;
671 }
672
673 rc = ppc_md.nvram_write(buff, length, &tmp_index);
674 if (rc <= 0) {
675 printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
676 return rc;
677 }
678
679 return 0;
680}
681
682/* nvram_read_error_log
683 *
684 * Reads nvram for error log for at most 'length'
685 */
686int nvram_read_error_log(char * buff, int length, unsigned int * err_type)
687{
688 int rc;
689 loff_t tmp_index;
690 struct err_log_info info;
691
692 if (nvram_error_log_index == -1)
693 return -1;
694
695 if (length > nvram_error_log_size)
696 length = nvram_error_log_size;
697
698 tmp_index = nvram_error_log_index;
699
700 rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index);
701 if (rc <= 0) {
702 printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
703 return rc;
704 }
705
706 rc = ppc_md.nvram_read(buff, length, &tmp_index);
707 if (rc <= 0) {
708 printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
709 return rc;
710 }
711
712 error_log_cnt = info.seq_num;
713 *err_type = info.error_type;
714
715 return 0;
716}
717
718/* This doesn't actually zero anything, but it sets the event_logged
719 * word to tell that this event is safely in syslog.
720 */
721int nvram_clear_error_log(void)
722{
723 loff_t tmp_index;
724 int clear_word = ERR_FLAG_ALREADY_LOGGED;
725 int rc;
726
727 tmp_index = nvram_error_log_index;
728
729 rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);
730 if (rc <= 0) {
731 printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc);
732 return rc;
733 }
734
735 return 0;
736}
737
738#endif /* CONFIG_PPC_PSERIES */
739
740module_init(nvram_init);
741module_exit(nvram_cleanup);
742MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 23:48:16 -0500