Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * File: mca_drv.c | |
3 | * Purpose: Generic MCA handling layer | |
4 | * | |
5 | * Copyright (C) 2004 FUJITSU LIMITED | |
6 | * Copyright (C) Hidetoshi Seto (seto.hidetoshi@jp.fujitsu.com) | |
7f613c7d KO |
7 | * Copyright (C) 2005 Silicon Graphics, Inc |
8 | * Copyright (C) 2005 Keith Owens <kaos@sgi.com> | |
d2a28ad9 | 9 | * Copyright (C) 2006 Russ Anderson <rja@sgi.com> |
1da177e4 | 10 | */ |
1da177e4 LT |
11 | #include <linux/types.h> |
12 | #include <linux/init.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/irq.h> | |
16 | #include <linux/kallsyms.h> | |
17 | #include <linux/smp_lock.h> | |
18 | #include <linux/bootmem.h> | |
19 | #include <linux/acpi.h> | |
20 | #include <linux/timer.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/workqueue.h> | |
25 | #include <linux/mm.h> | |
26 | ||
27 | #include <asm/delay.h> | |
28 | #include <asm/machvec.h> | |
29 | #include <asm/page.h> | |
30 | #include <asm/ptrace.h> | |
31 | #include <asm/system.h> | |
32 | #include <asm/sal.h> | |
33 | #include <asm/mca.h> | |
34 | ||
35 | #include <asm/irq.h> | |
36 | #include <asm/hw_irq.h> | |
37 | ||
38 | #include "mca_drv.h" | |
39 | ||
40 | /* max size of SAL error record (default) */ | |
41 | static int sal_rec_max = 10000; | |
42 | ||
1da177e4 LT |
43 | /* from mca_drv_asm.S */ |
44 | extern void *mca_handler_bhhook(void); | |
45 | ||
46 | static DEFINE_SPINLOCK(mca_bh_lock); | |
47 | ||
48 | typedef enum { | |
49 | MCA_IS_LOCAL = 0, | |
50 | MCA_IS_GLOBAL = 1 | |
51 | } mca_type_t; | |
52 | ||
53 | #define MAX_PAGE_ISOLATE 1024 | |
54 | ||
55 | static struct page *page_isolate[MAX_PAGE_ISOLATE]; | |
56 | static int num_page_isolate = 0; | |
57 | ||
58 | typedef enum { | |
4881e2cd HS |
59 | ISOLATE_NG, |
60 | ISOLATE_OK, | |
61 | ISOLATE_NONE | |
1da177e4 LT |
62 | } isolate_status_t; |
63 | ||
18997961 RA |
64 | typedef enum { |
65 | MCA_NOT_RECOVERED = 0, | |
66 | MCA_RECOVERED = 1 | |
67 | } recovery_status_t; | |
68 | ||
1da177e4 LT |
69 | /* |
70 | * This pool keeps pointers to the section part of SAL error record | |
71 | */ | |
72 | static struct { | |
73 | slidx_list_t *buffer; /* section pointer list pool */ | |
74 | int cur_idx; /* Current index of section pointer list pool */ | |
75 | int max_idx; /* Maximum index of section pointer list pool */ | |
76 | } slidx_pool; | |
77 | ||
18997961 RA |
78 | static int |
79 | fatal_mca(const char *fmt, ...) | |
80 | { | |
81 | va_list args; | |
43ed3baf | 82 | char buf[256]; |
18997961 RA |
83 | |
84 | va_start(args, fmt); | |
43ed3baf | 85 | vsnprintf(buf, sizeof(buf), fmt, args); |
18997961 | 86 | va_end(args); |
43ed3baf | 87 | ia64_mca_printk(KERN_ALERT "MCA: %s\n", buf); |
18997961 RA |
88 | |
89 | return MCA_NOT_RECOVERED; | |
90 | } | |
91 | ||
43ed3baf HS |
92 | static int |
93 | mca_recovered(const char *fmt, ...) | |
94 | { | |
95 | va_list args; | |
96 | char buf[256]; | |
97 | ||
98 | va_start(args, fmt); | |
99 | vsnprintf(buf, sizeof(buf), fmt, args); | |
100 | va_end(args); | |
101 | ia64_mca_printk(KERN_INFO "MCA: %s\n", buf); | |
102 | ||
103 | return MCA_RECOVERED; | |
104 | } | |
105 | ||
1da177e4 LT |
106 | /** |
107 | * mca_page_isolate - isolate a poisoned page in order not to use it later | |
108 | * @paddr: poisoned memory location | |
109 | * | |
110 | * Return value: | |
4881e2cd | 111 | * one of isolate_status_t, ISOLATE_OK/NG/NONE. |
1da177e4 LT |
112 | */ |
113 | ||
114 | static isolate_status_t | |
115 | mca_page_isolate(unsigned long paddr) | |
116 | { | |
117 | int i; | |
118 | struct page *p; | |
119 | ||
120 | /* whether physical address is valid or not */ | |
20305e59 | 121 | if (!ia64_phys_addr_valid(paddr)) |
4881e2cd HS |
122 | return ISOLATE_NONE; |
123 | ||
56f87b82 | 124 | if (!pfn_valid(paddr >> PAGE_SHIFT)) |
4881e2cd | 125 | return ISOLATE_NONE; |
1da177e4 LT |
126 | |
127 | /* convert physical address to physical page number */ | |
128 | p = pfn_to_page(paddr>>PAGE_SHIFT); | |
129 | ||
130 | /* check whether a page number have been already registered or not */ | |
20305e59 HS |
131 | for (i = 0; i < num_page_isolate; i++) |
132 | if (page_isolate[i] == p) | |
1da177e4 LT |
133 | return ISOLATE_OK; /* already listed */ |
134 | ||
135 | /* limitation check */ | |
20305e59 | 136 | if (num_page_isolate == MAX_PAGE_ISOLATE) |
1da177e4 LT |
137 | return ISOLATE_NG; |
138 | ||
139 | /* kick pages having attribute 'SLAB' or 'Reserved' */ | |
20305e59 | 140 | if (PageSlab(p) || PageReserved(p)) |
1da177e4 LT |
141 | return ISOLATE_NG; |
142 | ||
143 | /* add attribute 'Reserved' and register the page */ | |
cbb92144 | 144 | get_page(p); |
1da177e4 LT |
145 | SetPageReserved(p); |
146 | page_isolate[num_page_isolate++] = p; | |
147 | ||
148 | return ISOLATE_OK; | |
149 | } | |
150 | ||
151 | /** | |
152 | * mca_hanlder_bh - Kill the process which occurred memory read error | |
153 | * @paddr: poisoned address received from MCA Handler | |
154 | */ | |
155 | ||
156 | void | |
d2a28ad9 | 157 | mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr) |
1da177e4 | 158 | { |
43ed3baf | 159 | ia64_mlogbuf_dump(); |
d2a28ad9 RA |
160 | printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, " |
161 | "iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n", | |
162 | raw_smp_processor_id(), current->pid, current->uid, | |
163 | iip, ipsr, paddr, current->comm); | |
1da177e4 LT |
164 | |
165 | spin_lock(&mca_bh_lock); | |
4881e2cd HS |
166 | switch (mca_page_isolate(paddr)) { |
167 | case ISOLATE_OK: | |
1da177e4 | 168 | printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr); |
4881e2cd HS |
169 | break; |
170 | case ISOLATE_NG: | |
ea0e92a6 | 171 | printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr); |
4881e2cd HS |
172 | break; |
173 | default: | |
174 | break; | |
1da177e4 LT |
175 | } |
176 | spin_unlock(&mca_bh_lock); | |
177 | ||
178 | /* This process is about to be killed itself */ | |
b1b901c2 | 179 | do_exit(SIGKILL); |
1da177e4 LT |
180 | } |
181 | ||
182 | /** | |
183 | * mca_make_peidx - Make index of processor error section | |
184 | * @slpi: pointer to record of processor error section | |
185 | * @peidx: pointer to index of processor error section | |
186 | */ | |
187 | ||
20305e59 | 188 | static void |
1da177e4 LT |
189 | mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx) |
190 | { | |
20305e59 | 191 | /* |
1da177e4 LT |
192 | * calculate the start address of |
193 | * "struct cpuid_info" and "sal_processor_static_info_t". | |
194 | */ | |
195 | u64 total_check_num = slpi->valid.num_cache_check | |
196 | + slpi->valid.num_tlb_check | |
197 | + slpi->valid.num_bus_check | |
198 | + slpi->valid.num_reg_file_check | |
199 | + slpi->valid.num_ms_check; | |
200 | u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num | |
201 | + sizeof(sal_log_processor_info_t); | |
202 | u64 mid_size = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info); | |
203 | ||
204 | peidx_head(peidx) = slpi; | |
205 | peidx_mid(peidx) = (struct sal_cpuid_info *) | |
206 | (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL); | |
207 | peidx_bottom(peidx) = (sal_processor_static_info_t *) | |
208 | (slpi->valid.psi_static_struct ? | |
209 | ((char*)slpi + head_size + mid_size) : NULL); | |
210 | } | |
211 | ||
212 | /** | |
20305e59 | 213 | * mca_make_slidx - Make index of SAL error record |
1da177e4 LT |
214 | * @buffer: pointer to SAL error record |
215 | * @slidx: pointer to index of SAL error record | |
216 | * | |
217 | * Return value: | |
218 | * 1 if record has platform error / 0 if not | |
219 | */ | |
220 | #define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \ | |
20305e59 HS |
221 | {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \ |
222 | hl->hdr = ptr; \ | |
223 | list_add(&hl->list, &(sect)); \ | |
224 | slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; } | |
1da177e4 | 225 | |
20305e59 | 226 | static int |
1da177e4 LT |
227 | mca_make_slidx(void *buffer, slidx_table_t *slidx) |
228 | { | |
229 | int platform_err = 0; | |
230 | int record_len = ((sal_log_record_header_t*)buffer)->len; | |
231 | u32 ercd_pos; | |
232 | int sects; | |
233 | sal_log_section_hdr_t *sp; | |
234 | ||
235 | /* | |
236 | * Initialize index referring current record | |
237 | */ | |
238 | INIT_LIST_HEAD(&(slidx->proc_err)); | |
239 | INIT_LIST_HEAD(&(slidx->mem_dev_err)); | |
240 | INIT_LIST_HEAD(&(slidx->sel_dev_err)); | |
241 | INIT_LIST_HEAD(&(slidx->pci_bus_err)); | |
242 | INIT_LIST_HEAD(&(slidx->smbios_dev_err)); | |
243 | INIT_LIST_HEAD(&(slidx->pci_comp_err)); | |
244 | INIT_LIST_HEAD(&(slidx->plat_specific_err)); | |
245 | INIT_LIST_HEAD(&(slidx->host_ctlr_err)); | |
246 | INIT_LIST_HEAD(&(slidx->plat_bus_err)); | |
247 | INIT_LIST_HEAD(&(slidx->unsupported)); | |
248 | ||
249 | /* | |
250 | * Extract a Record Header | |
251 | */ | |
252 | slidx->header = buffer; | |
253 | ||
254 | /* | |
255 | * Extract each section records | |
256 | * (arranged from "int ia64_log_platform_info_print()") | |
257 | */ | |
258 | for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0; | |
259 | ercd_pos < record_len; ercd_pos += sp->len, sects++) { | |
260 | sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos); | |
261 | if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) { | |
262 | LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp); | |
20305e59 HS |
263 | } else if (!efi_guidcmp(sp->guid, |
264 | SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
265 | platform_err = 1; |
266 | LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp); | |
20305e59 HS |
267 | } else if (!efi_guidcmp(sp->guid, |
268 | SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
269 | platform_err = 1; |
270 | LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp); | |
20305e59 HS |
271 | } else if (!efi_guidcmp(sp->guid, |
272 | SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) { | |
1da177e4 LT |
273 | platform_err = 1; |
274 | LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp); | |
20305e59 HS |
275 | } else if (!efi_guidcmp(sp->guid, |
276 | SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
277 | platform_err = 1; |
278 | LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp); | |
20305e59 HS |
279 | } else if (!efi_guidcmp(sp->guid, |
280 | SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) { | |
1da177e4 LT |
281 | platform_err = 1; |
282 | LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp); | |
20305e59 HS |
283 | } else if (!efi_guidcmp(sp->guid, |
284 | SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) { | |
1da177e4 LT |
285 | platform_err = 1; |
286 | LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp); | |
20305e59 HS |
287 | } else if (!efi_guidcmp(sp->guid, |
288 | SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) { | |
1da177e4 LT |
289 | platform_err = 1; |
290 | LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp); | |
20305e59 HS |
291 | } else if (!efi_guidcmp(sp->guid, |
292 | SAL_PLAT_BUS_ERR_SECT_GUID)) { | |
1da177e4 LT |
293 | platform_err = 1; |
294 | LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp); | |
295 | } else { | |
296 | LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp); | |
297 | } | |
298 | } | |
299 | slidx->n_sections = sects; | |
300 | ||
301 | return platform_err; | |
302 | } | |
303 | ||
304 | /** | |
305 | * init_record_index_pools - Initialize pool of lists for SAL record index | |
306 | * | |
307 | * Return value: | |
308 | * 0 on Success / -ENOMEM on Failure | |
309 | */ | |
20305e59 | 310 | static int |
1da177e4 LT |
311 | init_record_index_pools(void) |
312 | { | |
313 | int i; | |
314 | int rec_max_size; /* Maximum size of SAL error records */ | |
315 | int sect_min_size; /* Minimum size of SAL error sections */ | |
316 | /* minimum size table of each section */ | |
20305e59 HS |
317 | static int sal_log_sect_min_sizes[] = { |
318 | sizeof(sal_log_processor_info_t) | |
319 | + sizeof(sal_processor_static_info_t), | |
1da177e4 LT |
320 | sizeof(sal_log_mem_dev_err_info_t), |
321 | sizeof(sal_log_sel_dev_err_info_t), | |
322 | sizeof(sal_log_pci_bus_err_info_t), | |
323 | sizeof(sal_log_smbios_dev_err_info_t), | |
324 | sizeof(sal_log_pci_comp_err_info_t), | |
325 | sizeof(sal_log_plat_specific_err_info_t), | |
326 | sizeof(sal_log_host_ctlr_err_info_t), | |
327 | sizeof(sal_log_plat_bus_err_info_t), | |
328 | }; | |
329 | ||
330 | /* | |
331 | * MCA handler cannot allocate new memory on flight, | |
332 | * so we preallocate enough memory to handle a SAL record. | |
333 | * | |
334 | * Initialize a handling set of slidx_pool: | |
335 | * 1. Pick up the max size of SAL error records | |
336 | * 2. Pick up the min size of SAL error sections | |
337 | * 3. Allocate the pool as enough to 2 SAL records | |
338 | * (now we can estimate the maxinum of section in a record.) | |
339 | */ | |
340 | ||
341 | /* - 1 - */ | |
342 | rec_max_size = sal_rec_max; | |
343 | ||
344 | /* - 2 - */ | |
345 | sect_min_size = sal_log_sect_min_sizes[0]; | |
346 | for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++) | |
347 | if (sect_min_size > sal_log_sect_min_sizes[i]) | |
348 | sect_min_size = sal_log_sect_min_sizes[i]; | |
349 | ||
350 | /* - 3 - */ | |
351 | slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1; | |
20305e59 HS |
352 | slidx_pool.buffer = (slidx_list_t *) |
353 | kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL); | |
1da177e4 LT |
354 | |
355 | return slidx_pool.buffer ? 0 : -ENOMEM; | |
356 | } | |
357 | ||
358 | ||
359 | /***************************************************************************** | |
360 | * Recovery functions * | |
361 | *****************************************************************************/ | |
362 | ||
363 | /** | |
364 | * is_mca_global - Check whether this MCA is global or not | |
365 | * @peidx: pointer of index of processor error section | |
366 | * @pbci: pointer to pal_bus_check_info_t | |
20305e59 | 367 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
368 | * |
369 | * Return value: | |
370 | * MCA_IS_LOCAL / MCA_IS_GLOBAL | |
371 | */ | |
372 | ||
373 | static mca_type_t | |
7f613c7d KO |
374 | is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci, |
375 | struct ia64_sal_os_state *sos) | |
1da177e4 | 376 | { |
20305e59 HS |
377 | pal_processor_state_info_t *psp = |
378 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 | 379 | |
20305e59 | 380 | /* |
1da177e4 | 381 | * PAL can request a rendezvous, if the MCA has a global scope. |
20305e59 | 382 | * If "rz_always" flag is set, SAL requests MCA rendezvous |
1da177e4 LT |
383 | * in spite of global MCA. |
384 | * Therefore it is local MCA when rendezvous has not been requested. | |
385 | * Failed to rendezvous, the system must be down. | |
386 | */ | |
7f613c7d | 387 | switch (sos->rv_rc) { |
1da177e4 LT |
388 | case -1: /* SAL rendezvous unsuccessful */ |
389 | return MCA_IS_GLOBAL; | |
390 | case 0: /* SAL rendezvous not required */ | |
391 | return MCA_IS_LOCAL; | |
392 | case 1: /* SAL rendezvous successful int */ | |
393 | case 2: /* SAL rendezvous successful int with init */ | |
394 | default: | |
395 | break; | |
396 | } | |
397 | ||
398 | /* | |
399 | * If One or more Cache/TLB/Reg_File/Uarch_Check is here, | |
400 | * it would be a local MCA. (i.e. processor internal error) | |
401 | */ | |
402 | if (psp->tc || psp->cc || psp->rc || psp->uc) | |
403 | return MCA_IS_LOCAL; | |
404 | ||
405 | /* | |
406 | * Bus_Check structure with Bus_Check.ib (internal bus error) flag set | |
407 | * would be a global MCA. (e.g. a system bus address parity error) | |
408 | */ | |
409 | if (!pbci || pbci->ib) | |
410 | return MCA_IS_GLOBAL; | |
411 | ||
412 | /* | |
413 | * Bus_Check structure with Bus_Check.eb (external bus error) flag set | |
414 | * could be either a local MCA or a global MCA. | |
415 | * | |
416 | * Referring Bus_Check.bsi: | |
417 | * 0: Unknown/unclassified | |
418 | * 1: BERR# | |
419 | * 2: BINIT# | |
420 | * 3: Hard Fail | |
421 | * (FIXME: Are these SGI specific or generic bsi values?) | |
422 | */ | |
423 | if (pbci->eb) | |
424 | switch (pbci->bsi) { | |
425 | case 0: | |
426 | /* e.g. a load from poisoned memory */ | |
427 | return MCA_IS_LOCAL; | |
428 | case 1: | |
429 | case 2: | |
430 | case 3: | |
431 | return MCA_IS_GLOBAL; | |
432 | } | |
433 | ||
434 | return MCA_IS_GLOBAL; | |
435 | } | |
436 | ||
264b0f99 RA |
437 | /** |
438 | * get_target_identifier - Get the valid Cache or Bus check target identifier. | |
439 | * @peidx: pointer of index of processor error section | |
440 | * | |
441 | * Return value: | |
442 | * target address on Success / 0 on Failue | |
443 | */ | |
444 | static u64 | |
445 | get_target_identifier(peidx_table_t *peidx) | |
446 | { | |
447 | u64 target_address = 0; | |
448 | sal_log_mod_error_info_t *smei; | |
449 | pal_cache_check_info_t *pcci; | |
450 | int i, level = 9; | |
451 | ||
452 | /* | |
453 | * Look through the cache checks for a valid target identifier | |
454 | * If more than one valid target identifier, return the one | |
455 | * with the lowest cache level. | |
456 | */ | |
457 | for (i = 0; i < peidx_cache_check_num(peidx); i++) { | |
458 | smei = (sal_log_mod_error_info_t *)peidx_cache_check(peidx, i); | |
459 | if (smei->valid.target_identifier && smei->target_identifier) { | |
460 | pcci = (pal_cache_check_info_t *)&(smei->check_info); | |
461 | if (!target_address || (pcci->level < level)) { | |
462 | target_address = smei->target_identifier; | |
463 | level = pcci->level; | |
464 | continue; | |
465 | } | |
466 | } | |
467 | } | |
468 | if (target_address) | |
469 | return target_address; | |
470 | ||
471 | /* | |
472 | * Look at the bus check for a valid target identifier | |
473 | */ | |
474 | smei = peidx_bus_check(peidx, 0); | |
475 | if (smei && smei->valid.target_identifier) | |
476 | return smei->target_identifier; | |
477 | ||
478 | return 0; | |
479 | } | |
480 | ||
1da177e4 LT |
481 | /** |
482 | * recover_from_read_error - Try to recover the errors which type are "read"s. | |
483 | * @slidx: pointer of index of SAL error record | |
484 | * @peidx: pointer of index of processor error section | |
485 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 486 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
487 | * |
488 | * Return value: | |
489 | * 1 on Success / 0 on Failure | |
490 | */ | |
491 | ||
492 | static int | |
20305e59 HS |
493 | recover_from_read_error(slidx_table_t *slidx, |
494 | peidx_table_t *peidx, pal_bus_check_info_t *pbci, | |
7f613c7d | 495 | struct ia64_sal_os_state *sos) |
1da177e4 | 496 | { |
264b0f99 | 497 | u64 target_identifier; |
1da177e4 LT |
498 | pal_min_state_area_t *pmsa; |
499 | struct ia64_psr *psr1, *psr2; | |
500 | ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook; | |
501 | ||
502 | /* Is target address valid? */ | |
264b0f99 RA |
503 | target_identifier = get_target_identifier(peidx); |
504 | if (!target_identifier) | |
43ed3baf | 505 | return fatal_mca("target address not valid"); |
1da177e4 LT |
506 | |
507 | /* | |
508 | * cpu read or memory-mapped io read | |
509 | * | |
510 | * offending process affected process OS MCA do | |
511 | * kernel mode kernel mode down system | |
512 | * kernel mode user mode kill the process | |
513 | * user mode kernel mode down system (*) | |
514 | * user mode user mode kill the process | |
515 | * | |
516 | * (*) You could terminate offending user-mode process | |
517 | * if (pbci->pv && pbci->pl != 0) *and* if you sure | |
518 | * the process not have any locks of kernel. | |
519 | */ | |
520 | ||
a9474646 HS |
521 | /* Is minstate valid? */ |
522 | if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate)) | |
43ed3baf | 523 | return fatal_mca("minstate not valid"); |
1da177e4 | 524 | psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr); |
d2a28ad9 | 525 | psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr); |
1da177e4 LT |
526 | |
527 | /* | |
528 | * Check the privilege level of interrupted context. | |
529 | * If it is user-mode, then terminate affected process. | |
530 | */ | |
d2a28ad9 RA |
531 | |
532 | pmsa = sos->pal_min_state; | |
533 | if (psr1->cpl != 0 || | |
534 | ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) { | |
264b0f99 RA |
535 | /* |
536 | * setup for resume to bottom half of MCA, | |
537 | * "mca_handler_bhhook" | |
538 | */ | |
539 | /* pass to bhhook as argument (gr8, ...) */ | |
540 | pmsa->pmsa_gr[8-1] = target_identifier; | |
541 | pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip; | |
542 | pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr; | |
543 | /* set interrupted return address (but no use) */ | |
544 | pmsa->pmsa_br0 = pmsa->pmsa_iip; | |
545 | /* change resume address to bottom half */ | |
546 | pmsa->pmsa_iip = mca_hdlr_bh->fp; | |
547 | pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp; | |
548 | /* set cpl with kernel mode */ | |
549 | psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr; | |
550 | psr2->cpl = 0; | |
551 | psr2->ri = 0; | |
552 | psr2->bn = 1; | |
553 | psr2->i = 0; | |
554 | ||
555 | return mca_recovered("user memory corruption. " | |
43ed3baf | 556 | "kill affected process - recovered."); |
1da177e4 LT |
557 | } |
558 | ||
43ed3baf HS |
559 | return fatal_mca("kernel context not recovered, iip 0x%lx\n", |
560 | pmsa->pmsa_iip); | |
1da177e4 LT |
561 | } |
562 | ||
563 | /** | |
564 | * recover_from_platform_error - Recover from platform error. | |
565 | * @slidx: pointer of index of SAL error record | |
566 | * @peidx: pointer of index of processor error section | |
567 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 568 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
569 | * |
570 | * Return value: | |
571 | * 1 on Success / 0 on Failure | |
572 | */ | |
573 | ||
574 | static int | |
20305e59 HS |
575 | recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx, |
576 | pal_bus_check_info_t *pbci, | |
7f613c7d | 577 | struct ia64_sal_os_state *sos) |
1da177e4 LT |
578 | { |
579 | int status = 0; | |
20305e59 HS |
580 | pal_processor_state_info_t *psp = |
581 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 LT |
582 | |
583 | if (psp->bc && pbci->eb && pbci->bsi == 0) { | |
584 | switch(pbci->type) { | |
585 | case 1: /* partial read */ | |
586 | case 3: /* full line(cpu) read */ | |
587 | case 9: /* I/O space read */ | |
20305e59 HS |
588 | status = recover_from_read_error(slidx, peidx, pbci, |
589 | sos); | |
1da177e4 LT |
590 | break; |
591 | case 0: /* unknown */ | |
592 | case 2: /* partial write */ | |
593 | case 4: /* full line write */ | |
594 | case 5: /* implicit or explicit write-back operation */ | |
595 | case 6: /* snoop probe */ | |
596 | case 7: /* incoming or outgoing ptc.g */ | |
597 | case 8: /* write coalescing transactions */ | |
598 | case 10: /* I/O space write */ | |
599 | case 11: /* inter-processor interrupt message(IPI) */ | |
20305e59 HS |
600 | case 12: /* interrupt acknowledge or |
601 | external task priority cycle */ | |
1da177e4 LT |
602 | default: |
603 | break; | |
604 | } | |
605 | } | |
606 | ||
607 | return status; | |
608 | } | |
609 | ||
618b206f RA |
610 | /* |
611 | * recover_from_tlb_check | |
612 | * @peidx: pointer of index of processor error section | |
613 | * | |
614 | * Return value: | |
615 | * 1 on Success / 0 on Failure | |
616 | */ | |
617 | static int | |
618 | recover_from_tlb_check(peidx_table_t *peidx) | |
619 | { | |
620 | sal_log_mod_error_info_t *smei; | |
621 | pal_tlb_check_info_t *ptci; | |
622 | ||
623 | smei = (sal_log_mod_error_info_t *)peidx_tlb_check(peidx, 0); | |
624 | ptci = (pal_tlb_check_info_t *)&(smei->check_info); | |
625 | ||
626 | /* | |
627 | * Look for signature of a duplicate TLB DTC entry, which is | |
628 | * a SW bug and always fatal. | |
629 | */ | |
630 | if (ptci->op == PAL_TLB_CHECK_OP_PURGE | |
631 | && !(ptci->itr || ptci->dtc || ptci->itc)) | |
632 | return fatal_mca("Duplicate TLB entry"); | |
633 | ||
634 | return mca_recovered("TLB check recovered"); | |
635 | } | |
636 | ||
1da177e4 LT |
637 | /** |
638 | * recover_from_processor_error | |
639 | * @platform: whether there are some platform error section or not | |
640 | * @slidx: pointer of index of SAL error record | |
641 | * @peidx: pointer of index of processor error section | |
642 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 643 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
644 | * |
645 | * Return value: | |
646 | * 1 on Success / 0 on Failure | |
647 | */ | |
648 | /* | |
649 | * Later we try to recover when below all conditions are satisfied. | |
650 | * 1. Only one processor error section is exist. | |
651 | * 2. BUS_CHECK is exist and the others are not exist.(Except TLB_CHECK) | |
652 | * 3. The entry of BUS_CHECK_INFO is 1. | |
653 | * 4. "External bus error" flag is set and the others are not set. | |
654 | */ | |
655 | ||
656 | static int | |
20305e59 HS |
657 | recover_from_processor_error(int platform, slidx_table_t *slidx, |
658 | peidx_table_t *peidx, pal_bus_check_info_t *pbci, | |
7f613c7d | 659 | struct ia64_sal_os_state *sos) |
1da177e4 | 660 | { |
20305e59 HS |
661 | pal_processor_state_info_t *psp = |
662 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 | 663 | |
20305e59 | 664 | /* |
a14f25a0 RA |
665 | * Processor recovery status must key off of the PAL recovery |
666 | * status in the Processor State Parameter. | |
1da177e4 | 667 | */ |
a14f25a0 RA |
668 | |
669 | /* | |
670 | * The machine check is corrected. | |
671 | */ | |
672 | if (psp->cm == 1) | |
43ed3baf | 673 | return mca_recovered("machine check is already corrected."); |
a14f25a0 RA |
674 | |
675 | /* | |
676 | * The error was not contained. Software must be reset. | |
677 | */ | |
678 | if (psp->us || psp->ci == 0) | |
43ed3baf | 679 | return fatal_mca("error not contained"); |
1da177e4 | 680 | |
618b206f RA |
681 | /* |
682 | * Look for recoverable TLB check | |
683 | */ | |
684 | if (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc)) | |
685 | return recover_from_tlb_check(peidx); | |
686 | ||
1da177e4 | 687 | /* |
e1c48554 RA |
688 | * The cache check and bus check bits have four possible states |
689 | * cc bc | |
690 | * 0 0 Weird record, not recovered | |
691 | * 1 0 Cache error, not recovered | |
692 | * 0 1 I/O error, attempt recovery | |
693 | * 1 1 Memory error, attempt recovery | |
1da177e4 LT |
694 | */ |
695 | if (psp->bc == 0 || pbci == NULL) | |
43ed3baf | 696 | return fatal_mca("No bus check"); |
1da177e4 LT |
697 | |
698 | /* | |
699 | * Sorry, we cannot handle so many. | |
700 | */ | |
701 | if (peidx_bus_check_num(peidx) > 1) | |
43ed3baf | 702 | return fatal_mca("Too many bus checks"); |
1da177e4 LT |
703 | /* |
704 | * Well, here is only one bus error. | |
705 | */ | |
18997961 | 706 | if (pbci->ib) |
43ed3baf | 707 | return fatal_mca("Internal Bus error"); |
18997961 | 708 | if (pbci->cc) |
43ed3baf | 709 | return fatal_mca("Cache-cache error"); |
1da177e4 | 710 | if (pbci->eb && pbci->bsi > 0) |
43ed3baf | 711 | return fatal_mca("External bus check fatal status"); |
1da177e4 LT |
712 | |
713 | /* | |
714 | * This is a local MCA and estimated as recoverble external bus error. | |
715 | * (e.g. a load from poisoned memory) | |
716 | * This means "there are some platform errors". | |
717 | */ | |
20305e59 | 718 | if (platform) |
7f613c7d | 719 | return recover_from_platform_error(slidx, peidx, pbci, sos); |
20305e59 HS |
720 | /* |
721 | * On account of strange SAL error record, we cannot recover. | |
1da177e4 | 722 | */ |
43ed3baf | 723 | return fatal_mca("Strange SAL record"); |
1da177e4 LT |
724 | } |
725 | ||
726 | /** | |
727 | * mca_try_to_recover - Try to recover from MCA | |
728 | * @rec: pointer to a SAL error record | |
20305e59 | 729 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
730 | * |
731 | * Return value: | |
732 | * 1 on Success / 0 on Failure | |
733 | */ | |
734 | ||
735 | static int | |
20305e59 | 736 | mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos) |
1da177e4 LT |
737 | { |
738 | int platform_err; | |
739 | int n_proc_err; | |
740 | slidx_table_t slidx; | |
741 | peidx_table_t peidx; | |
742 | pal_bus_check_info_t pbci; | |
743 | ||
1da177e4 LT |
744 | /* Make index of SAL error record */ |
745 | platform_err = mca_make_slidx(rec, &slidx); | |
746 | ||
747 | /* Count processor error sections */ | |
748 | n_proc_err = slidx_count(&slidx, proc_err); | |
749 | ||
750 | /* Now, OS can recover when there is one processor error section */ | |
751 | if (n_proc_err > 1) | |
43ed3baf | 752 | return fatal_mca("Too Many Errors"); |
18997961 | 753 | else if (n_proc_err == 0) |
43ed3baf HS |
754 | /* Weird SAL record ... We can't do anything */ |
755 | return fatal_mca("Weird SAL record"); | |
1da177e4 LT |
756 | |
757 | /* Make index of processor error section */ | |
20305e59 HS |
758 | mca_make_peidx((sal_log_processor_info_t*) |
759 | slidx_first_entry(&slidx.proc_err)->hdr, &peidx); | |
1da177e4 LT |
760 | |
761 | /* Extract Processor BUS_CHECK[0] */ | |
762 | *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0); | |
763 | ||
764 | /* Check whether MCA is global or not */ | |
7f613c7d | 765 | if (is_mca_global(&peidx, &pbci, sos)) |
43ed3baf | 766 | return fatal_mca("global MCA"); |
1da177e4 LT |
767 | |
768 | /* Try to recover a processor error */ | |
20305e59 HS |
769 | return recover_from_processor_error(platform_err, &slidx, &peidx, |
770 | &pbci, sos); | |
1da177e4 LT |
771 | } |
772 | ||
773 | /* | |
774 | * ============================================================================= | |
775 | */ | |
776 | ||
777 | int __init mca_external_handler_init(void) | |
778 | { | |
779 | if (init_record_index_pools()) | |
780 | return -ENOMEM; | |
781 | ||
782 | /* register external mca handlers */ | |
20305e59 | 783 | if (ia64_reg_MCA_extension(mca_try_to_recover)) { |
1da177e4 LT |
784 | printk(KERN_ERR "ia64_reg_MCA_extension failed.\n"); |
785 | kfree(slidx_pool.buffer); | |
786 | return -EFAULT; | |
787 | } | |
788 | return 0; | |
789 | } | |
790 | ||
791 | void __exit mca_external_handler_exit(void) | |
792 | { | |
793 | /* unregister external mca handlers */ | |
794 | ia64_unreg_MCA_extension(); | |
795 | kfree(slidx_pool.buffer); | |
796 | } | |
797 | ||
798 | module_init(mca_external_handler_init); | |
799 | module_exit(mca_external_handler_exit); | |
800 | ||
801 | module_param(sal_rec_max, int, 0644); | |
802 | MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record"); | |
803 | ||
804 | MODULE_DESCRIPTION("ia64 platform dependent mca handler driver"); | |
805 | MODULE_LICENSE("GPL"); |