Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * File: mca_drv.c | |
3 | * Purpose: Generic MCA handling layer | |
4 | * | |
5 | * Copyright (C) 2004 FUJITSU LIMITED | |
fe77efb8 | 6 | * Copyright (C) 2004 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> | |
1da177e4 LT |
17 | #include <linux/bootmem.h> |
18 | #include <linux/acpi.h> | |
19 | #include <linux/timer.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/smp.h> | |
23 | #include <linux/workqueue.h> | |
24 | #include <linux/mm.h> | |
25 | ||
26 | #include <asm/delay.h> | |
27 | #include <asm/machvec.h> | |
28 | #include <asm/page.h> | |
29 | #include <asm/ptrace.h> | |
30 | #include <asm/system.h> | |
31 | #include <asm/sal.h> | |
32 | #include <asm/mca.h> | |
33 | ||
34 | #include <asm/irq.h> | |
35 | #include <asm/hw_irq.h> | |
36 | ||
37 | #include "mca_drv.h" | |
38 | ||
39 | /* max size of SAL error record (default) */ | |
40 | static int sal_rec_max = 10000; | |
41 | ||
1da177e4 LT |
42 | /* from mca_drv_asm.S */ |
43 | extern void *mca_handler_bhhook(void); | |
44 | ||
45 | static DEFINE_SPINLOCK(mca_bh_lock); | |
46 | ||
47 | typedef enum { | |
48 | MCA_IS_LOCAL = 0, | |
49 | MCA_IS_GLOBAL = 1 | |
50 | } mca_type_t; | |
51 | ||
52 | #define MAX_PAGE_ISOLATE 1024 | |
53 | ||
54 | static struct page *page_isolate[MAX_PAGE_ISOLATE]; | |
55 | static int num_page_isolate = 0; | |
56 | ||
57 | typedef enum { | |
4881e2cd HS |
58 | ISOLATE_NG, |
59 | ISOLATE_OK, | |
60 | ISOLATE_NONE | |
1da177e4 LT |
61 | } isolate_status_t; |
62 | ||
18997961 RA |
63 | typedef enum { |
64 | MCA_NOT_RECOVERED = 0, | |
65 | MCA_RECOVERED = 1 | |
66 | } recovery_status_t; | |
67 | ||
1da177e4 LT |
68 | /* |
69 | * This pool keeps pointers to the section part of SAL error record | |
70 | */ | |
71 | static struct { | |
72 | slidx_list_t *buffer; /* section pointer list pool */ | |
73 | int cur_idx; /* Current index of section pointer list pool */ | |
74 | int max_idx; /* Maximum index of section pointer list pool */ | |
75 | } slidx_pool; | |
76 | ||
18997961 RA |
77 | static int |
78 | fatal_mca(const char *fmt, ...) | |
79 | { | |
80 | va_list args; | |
43ed3baf | 81 | char buf[256]; |
18997961 RA |
82 | |
83 | va_start(args, fmt); | |
43ed3baf | 84 | vsnprintf(buf, sizeof(buf), fmt, args); |
18997961 | 85 | va_end(args); |
43ed3baf | 86 | ia64_mca_printk(KERN_ALERT "MCA: %s\n", buf); |
18997961 RA |
87 | |
88 | return MCA_NOT_RECOVERED; | |
89 | } | |
90 | ||
43ed3baf HS |
91 | static int |
92 | mca_recovered(const char *fmt, ...) | |
93 | { | |
94 | va_list args; | |
95 | char buf[256]; | |
96 | ||
97 | va_start(args, fmt); | |
98 | vsnprintf(buf, sizeof(buf), fmt, args); | |
99 | va_end(args); | |
100 | ia64_mca_printk(KERN_INFO "MCA: %s\n", buf); | |
101 | ||
102 | return MCA_RECOVERED; | |
103 | } | |
104 | ||
1da177e4 LT |
105 | /** |
106 | * mca_page_isolate - isolate a poisoned page in order not to use it later | |
107 | * @paddr: poisoned memory location | |
108 | * | |
109 | * Return value: | |
4881e2cd | 110 | * one of isolate_status_t, ISOLATE_OK/NG/NONE. |
1da177e4 LT |
111 | */ |
112 | ||
113 | static isolate_status_t | |
114 | mca_page_isolate(unsigned long paddr) | |
115 | { | |
116 | int i; | |
117 | struct page *p; | |
118 | ||
119 | /* whether physical address is valid or not */ | |
20305e59 | 120 | if (!ia64_phys_addr_valid(paddr)) |
4881e2cd HS |
121 | return ISOLATE_NONE; |
122 | ||
56f87b82 | 123 | if (!pfn_valid(paddr >> PAGE_SHIFT)) |
4881e2cd | 124 | return ISOLATE_NONE; |
1da177e4 LT |
125 | |
126 | /* convert physical address to physical page number */ | |
127 | p = pfn_to_page(paddr>>PAGE_SHIFT); | |
128 | ||
129 | /* check whether a page number have been already registered or not */ | |
20305e59 HS |
130 | for (i = 0; i < num_page_isolate; i++) |
131 | if (page_isolate[i] == p) | |
1da177e4 LT |
132 | return ISOLATE_OK; /* already listed */ |
133 | ||
134 | /* limitation check */ | |
20305e59 | 135 | if (num_page_isolate == MAX_PAGE_ISOLATE) |
1da177e4 LT |
136 | return ISOLATE_NG; |
137 | ||
138 | /* kick pages having attribute 'SLAB' or 'Reserved' */ | |
20305e59 | 139 | if (PageSlab(p) || PageReserved(p)) |
1da177e4 LT |
140 | return ISOLATE_NG; |
141 | ||
142 | /* add attribute 'Reserved' and register the page */ | |
cbb92144 | 143 | get_page(p); |
1da177e4 LT |
144 | SetPageReserved(p); |
145 | page_isolate[num_page_isolate++] = p; | |
146 | ||
147 | return ISOLATE_OK; | |
148 | } | |
149 | ||
150 | /** | |
151 | * mca_hanlder_bh - Kill the process which occurred memory read error | |
152 | * @paddr: poisoned address received from MCA Handler | |
153 | */ | |
154 | ||
155 | void | |
d2a28ad9 | 156 | mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr) |
1da177e4 | 157 | { |
43ed3baf | 158 | ia64_mlogbuf_dump(); |
d2a28ad9 RA |
159 | printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, " |
160 | "iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n", | |
ef81ee98 | 161 | raw_smp_processor_id(), current->pid, current_uid(), |
d2a28ad9 | 162 | iip, ipsr, paddr, current->comm); |
1da177e4 LT |
163 | |
164 | spin_lock(&mca_bh_lock); | |
4881e2cd HS |
165 | switch (mca_page_isolate(paddr)) { |
166 | case ISOLATE_OK: | |
1da177e4 | 167 | printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr); |
4881e2cd HS |
168 | break; |
169 | case ISOLATE_NG: | |
ea0e92a6 | 170 | printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr); |
4881e2cd HS |
171 | break; |
172 | default: | |
173 | break; | |
1da177e4 LT |
174 | } |
175 | spin_unlock(&mca_bh_lock); | |
176 | ||
177 | /* This process is about to be killed itself */ | |
b1b901c2 | 178 | do_exit(SIGKILL); |
1da177e4 LT |
179 | } |
180 | ||
181 | /** | |
182 | * mca_make_peidx - Make index of processor error section | |
183 | * @slpi: pointer to record of processor error section | |
184 | * @peidx: pointer to index of processor error section | |
185 | */ | |
186 | ||
20305e59 | 187 | static void |
1da177e4 LT |
188 | mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx) |
189 | { | |
20305e59 | 190 | /* |
1da177e4 LT |
191 | * calculate the start address of |
192 | * "struct cpuid_info" and "sal_processor_static_info_t". | |
193 | */ | |
194 | u64 total_check_num = slpi->valid.num_cache_check | |
195 | + slpi->valid.num_tlb_check | |
196 | + slpi->valid.num_bus_check | |
197 | + slpi->valid.num_reg_file_check | |
198 | + slpi->valid.num_ms_check; | |
199 | u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num | |
200 | + sizeof(sal_log_processor_info_t); | |
201 | u64 mid_size = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info); | |
202 | ||
203 | peidx_head(peidx) = slpi; | |
204 | peidx_mid(peidx) = (struct sal_cpuid_info *) | |
205 | (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL); | |
206 | peidx_bottom(peidx) = (sal_processor_static_info_t *) | |
207 | (slpi->valid.psi_static_struct ? | |
208 | ((char*)slpi + head_size + mid_size) : NULL); | |
209 | } | |
210 | ||
211 | /** | |
20305e59 | 212 | * mca_make_slidx - Make index of SAL error record |
1da177e4 LT |
213 | * @buffer: pointer to SAL error record |
214 | * @slidx: pointer to index of SAL error record | |
215 | * | |
216 | * Return value: | |
217 | * 1 if record has platform error / 0 if not | |
218 | */ | |
219 | #define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \ | |
20305e59 HS |
220 | {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \ |
221 | hl->hdr = ptr; \ | |
222 | list_add(&hl->list, &(sect)); \ | |
223 | slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; } | |
1da177e4 | 224 | |
20305e59 | 225 | static int |
1da177e4 LT |
226 | mca_make_slidx(void *buffer, slidx_table_t *slidx) |
227 | { | |
228 | int platform_err = 0; | |
229 | int record_len = ((sal_log_record_header_t*)buffer)->len; | |
230 | u32 ercd_pos; | |
231 | int sects; | |
232 | sal_log_section_hdr_t *sp; | |
233 | ||
234 | /* | |
235 | * Initialize index referring current record | |
236 | */ | |
237 | INIT_LIST_HEAD(&(slidx->proc_err)); | |
238 | INIT_LIST_HEAD(&(slidx->mem_dev_err)); | |
239 | INIT_LIST_HEAD(&(slidx->sel_dev_err)); | |
240 | INIT_LIST_HEAD(&(slidx->pci_bus_err)); | |
241 | INIT_LIST_HEAD(&(slidx->smbios_dev_err)); | |
242 | INIT_LIST_HEAD(&(slidx->pci_comp_err)); | |
243 | INIT_LIST_HEAD(&(slidx->plat_specific_err)); | |
244 | INIT_LIST_HEAD(&(slidx->host_ctlr_err)); | |
245 | INIT_LIST_HEAD(&(slidx->plat_bus_err)); | |
246 | INIT_LIST_HEAD(&(slidx->unsupported)); | |
247 | ||
248 | /* | |
249 | * Extract a Record Header | |
250 | */ | |
251 | slidx->header = buffer; | |
252 | ||
253 | /* | |
254 | * Extract each section records | |
255 | * (arranged from "int ia64_log_platform_info_print()") | |
256 | */ | |
257 | for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0; | |
258 | ercd_pos < record_len; ercd_pos += sp->len, sects++) { | |
259 | sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos); | |
260 | if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) { | |
261 | LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp); | |
20305e59 HS |
262 | } else if (!efi_guidcmp(sp->guid, |
263 | SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
264 | platform_err = 1; |
265 | LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp); | |
20305e59 HS |
266 | } else if (!efi_guidcmp(sp->guid, |
267 | SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
268 | platform_err = 1; |
269 | LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp); | |
20305e59 HS |
270 | } else if (!efi_guidcmp(sp->guid, |
271 | SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) { | |
1da177e4 LT |
272 | platform_err = 1; |
273 | LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp); | |
20305e59 HS |
274 | } else if (!efi_guidcmp(sp->guid, |
275 | SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
276 | platform_err = 1; |
277 | LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp); | |
20305e59 HS |
278 | } else if (!efi_guidcmp(sp->guid, |
279 | SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) { | |
1da177e4 LT |
280 | platform_err = 1; |
281 | LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp); | |
20305e59 HS |
282 | } else if (!efi_guidcmp(sp->guid, |
283 | SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) { | |
1da177e4 LT |
284 | platform_err = 1; |
285 | LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp); | |
20305e59 HS |
286 | } else if (!efi_guidcmp(sp->guid, |
287 | SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) { | |
1da177e4 LT |
288 | platform_err = 1; |
289 | LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp); | |
20305e59 HS |
290 | } else if (!efi_guidcmp(sp->guid, |
291 | SAL_PLAT_BUS_ERR_SECT_GUID)) { | |
1da177e4 LT |
292 | platform_err = 1; |
293 | LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp); | |
294 | } else { | |
295 | LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp); | |
296 | } | |
297 | } | |
298 | slidx->n_sections = sects; | |
299 | ||
300 | return platform_err; | |
301 | } | |
302 | ||
303 | /** | |
304 | * init_record_index_pools - Initialize pool of lists for SAL record index | |
305 | * | |
306 | * Return value: | |
307 | * 0 on Success / -ENOMEM on Failure | |
308 | */ | |
20305e59 | 309 | static int |
1da177e4 LT |
310 | init_record_index_pools(void) |
311 | { | |
312 | int i; | |
313 | int rec_max_size; /* Maximum size of SAL error records */ | |
314 | int sect_min_size; /* Minimum size of SAL error sections */ | |
315 | /* minimum size table of each section */ | |
20305e59 HS |
316 | static int sal_log_sect_min_sizes[] = { |
317 | sizeof(sal_log_processor_info_t) | |
318 | + sizeof(sal_processor_static_info_t), | |
1da177e4 LT |
319 | sizeof(sal_log_mem_dev_err_info_t), |
320 | sizeof(sal_log_sel_dev_err_info_t), | |
321 | sizeof(sal_log_pci_bus_err_info_t), | |
322 | sizeof(sal_log_smbios_dev_err_info_t), | |
323 | sizeof(sal_log_pci_comp_err_info_t), | |
324 | sizeof(sal_log_plat_specific_err_info_t), | |
325 | sizeof(sal_log_host_ctlr_err_info_t), | |
326 | sizeof(sal_log_plat_bus_err_info_t), | |
327 | }; | |
328 | ||
329 | /* | |
330 | * MCA handler cannot allocate new memory on flight, | |
331 | * so we preallocate enough memory to handle a SAL record. | |
332 | * | |
333 | * Initialize a handling set of slidx_pool: | |
334 | * 1. Pick up the max size of SAL error records | |
335 | * 2. Pick up the min size of SAL error sections | |
336 | * 3. Allocate the pool as enough to 2 SAL records | |
337 | * (now we can estimate the maxinum of section in a record.) | |
338 | */ | |
339 | ||
340 | /* - 1 - */ | |
341 | rec_max_size = sal_rec_max; | |
342 | ||
343 | /* - 2 - */ | |
344 | sect_min_size = sal_log_sect_min_sizes[0]; | |
345 | for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++) | |
346 | if (sect_min_size > sal_log_sect_min_sizes[i]) | |
347 | sect_min_size = sal_log_sect_min_sizes[i]; | |
348 | ||
349 | /* - 3 - */ | |
350 | slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1; | |
20305e59 HS |
351 | slidx_pool.buffer = (slidx_list_t *) |
352 | kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL); | |
1da177e4 LT |
353 | |
354 | return slidx_pool.buffer ? 0 : -ENOMEM; | |
355 | } | |
356 | ||
357 | ||
358 | /***************************************************************************** | |
359 | * Recovery functions * | |
360 | *****************************************************************************/ | |
361 | ||
362 | /** | |
363 | * is_mca_global - Check whether this MCA is global or not | |
364 | * @peidx: pointer of index of processor error section | |
365 | * @pbci: pointer to pal_bus_check_info_t | |
20305e59 | 366 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
367 | * |
368 | * Return value: | |
369 | * MCA_IS_LOCAL / MCA_IS_GLOBAL | |
370 | */ | |
371 | ||
372 | static mca_type_t | |
7f613c7d KO |
373 | is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci, |
374 | struct ia64_sal_os_state *sos) | |
1da177e4 | 375 | { |
20305e59 HS |
376 | pal_processor_state_info_t *psp = |
377 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 | 378 | |
20305e59 | 379 | /* |
1da177e4 | 380 | * PAL can request a rendezvous, if the MCA has a global scope. |
20305e59 | 381 | * If "rz_always" flag is set, SAL requests MCA rendezvous |
1da177e4 LT |
382 | * in spite of global MCA. |
383 | * Therefore it is local MCA when rendezvous has not been requested. | |
384 | * Failed to rendezvous, the system must be down. | |
385 | */ | |
7f613c7d | 386 | switch (sos->rv_rc) { |
1da177e4 LT |
387 | case -1: /* SAL rendezvous unsuccessful */ |
388 | return MCA_IS_GLOBAL; | |
389 | case 0: /* SAL rendezvous not required */ | |
390 | return MCA_IS_LOCAL; | |
391 | case 1: /* SAL rendezvous successful int */ | |
392 | case 2: /* SAL rendezvous successful int with init */ | |
393 | default: | |
394 | break; | |
395 | } | |
396 | ||
397 | /* | |
398 | * If One or more Cache/TLB/Reg_File/Uarch_Check is here, | |
399 | * it would be a local MCA. (i.e. processor internal error) | |
400 | */ | |
401 | if (psp->tc || psp->cc || psp->rc || psp->uc) | |
402 | return MCA_IS_LOCAL; | |
403 | ||
404 | /* | |
405 | * Bus_Check structure with Bus_Check.ib (internal bus error) flag set | |
406 | * would be a global MCA. (e.g. a system bus address parity error) | |
407 | */ | |
408 | if (!pbci || pbci->ib) | |
409 | return MCA_IS_GLOBAL; | |
410 | ||
411 | /* | |
412 | * Bus_Check structure with Bus_Check.eb (external bus error) flag set | |
413 | * could be either a local MCA or a global MCA. | |
414 | * | |
415 | * Referring Bus_Check.bsi: | |
416 | * 0: Unknown/unclassified | |
417 | * 1: BERR# | |
418 | * 2: BINIT# | |
419 | * 3: Hard Fail | |
420 | * (FIXME: Are these SGI specific or generic bsi values?) | |
421 | */ | |
422 | if (pbci->eb) | |
423 | switch (pbci->bsi) { | |
424 | case 0: | |
425 | /* e.g. a load from poisoned memory */ | |
426 | return MCA_IS_LOCAL; | |
427 | case 1: | |
428 | case 2: | |
429 | case 3: | |
430 | return MCA_IS_GLOBAL; | |
431 | } | |
432 | ||
433 | return MCA_IS_GLOBAL; | |
434 | } | |
435 | ||
264b0f99 RA |
436 | /** |
437 | * get_target_identifier - Get the valid Cache or Bus check target identifier. | |
438 | * @peidx: pointer of index of processor error section | |
439 | * | |
440 | * Return value: | |
72fdbdce | 441 | * target address on Success / 0 on Failure |
264b0f99 RA |
442 | */ |
443 | static u64 | |
444 | get_target_identifier(peidx_table_t *peidx) | |
445 | { | |
446 | u64 target_address = 0; | |
447 | sal_log_mod_error_info_t *smei; | |
448 | pal_cache_check_info_t *pcci; | |
449 | int i, level = 9; | |
450 | ||
451 | /* | |
452 | * Look through the cache checks for a valid target identifier | |
453 | * If more than one valid target identifier, return the one | |
454 | * with the lowest cache level. | |
455 | */ | |
456 | for (i = 0; i < peidx_cache_check_num(peidx); i++) { | |
457 | smei = (sal_log_mod_error_info_t *)peidx_cache_check(peidx, i); | |
458 | if (smei->valid.target_identifier && smei->target_identifier) { | |
459 | pcci = (pal_cache_check_info_t *)&(smei->check_info); | |
460 | if (!target_address || (pcci->level < level)) { | |
461 | target_address = smei->target_identifier; | |
462 | level = pcci->level; | |
463 | continue; | |
464 | } | |
465 | } | |
466 | } | |
467 | if (target_address) | |
468 | return target_address; | |
469 | ||
470 | /* | |
471 | * Look at the bus check for a valid target identifier | |
472 | */ | |
473 | smei = peidx_bus_check(peidx, 0); | |
474 | if (smei && smei->valid.target_identifier) | |
475 | return smei->target_identifier; | |
476 | ||
477 | return 0; | |
478 | } | |
479 | ||
1da177e4 LT |
480 | /** |
481 | * recover_from_read_error - Try to recover the errors which type are "read"s. | |
482 | * @slidx: pointer of index of SAL error record | |
483 | * @peidx: pointer of index of processor error section | |
484 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 485 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
486 | * |
487 | * Return value: | |
488 | * 1 on Success / 0 on Failure | |
489 | */ | |
490 | ||
491 | static int | |
20305e59 HS |
492 | recover_from_read_error(slidx_table_t *slidx, |
493 | peidx_table_t *peidx, pal_bus_check_info_t *pbci, | |
7f613c7d | 494 | struct ia64_sal_os_state *sos) |
1da177e4 | 495 | { |
264b0f99 | 496 | u64 target_identifier; |
1da177e4 LT |
497 | pal_min_state_area_t *pmsa; |
498 | struct ia64_psr *psr1, *psr2; | |
499 | ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook; | |
500 | ||
501 | /* Is target address valid? */ | |
264b0f99 RA |
502 | target_identifier = get_target_identifier(peidx); |
503 | if (!target_identifier) | |
43ed3baf | 504 | return fatal_mca("target address not valid"); |
1da177e4 LT |
505 | |
506 | /* | |
507 | * cpu read or memory-mapped io read | |
508 | * | |
509 | * offending process affected process OS MCA do | |
510 | * kernel mode kernel mode down system | |
511 | * kernel mode user mode kill the process | |
512 | * user mode kernel mode down system (*) | |
513 | * user mode user mode kill the process | |
514 | * | |
515 | * (*) You could terminate offending user-mode process | |
516 | * if (pbci->pv && pbci->pl != 0) *and* if you sure | |
517 | * the process not have any locks of kernel. | |
518 | */ | |
519 | ||
a9474646 HS |
520 | /* Is minstate valid? */ |
521 | if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate)) | |
43ed3baf | 522 | return fatal_mca("minstate not valid"); |
1da177e4 | 523 | psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr); |
d2a28ad9 | 524 | psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr); |
1da177e4 LT |
525 | |
526 | /* | |
527 | * Check the privilege level of interrupted context. | |
528 | * If it is user-mode, then terminate affected process. | |
529 | */ | |
d2a28ad9 RA |
530 | |
531 | pmsa = sos->pal_min_state; | |
532 | if (psr1->cpl != 0 || | |
533 | ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) { | |
264b0f99 RA |
534 | /* |
535 | * setup for resume to bottom half of MCA, | |
536 | * "mca_handler_bhhook" | |
537 | */ | |
538 | /* pass to bhhook as argument (gr8, ...) */ | |
539 | pmsa->pmsa_gr[8-1] = target_identifier; | |
540 | pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip; | |
541 | pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr; | |
542 | /* set interrupted return address (but no use) */ | |
543 | pmsa->pmsa_br0 = pmsa->pmsa_iip; | |
544 | /* change resume address to bottom half */ | |
545 | pmsa->pmsa_iip = mca_hdlr_bh->fp; | |
546 | pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp; | |
547 | /* set cpl with kernel mode */ | |
548 | psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr; | |
549 | psr2->cpl = 0; | |
550 | psr2->ri = 0; | |
551 | psr2->bn = 1; | |
552 | psr2->i = 0; | |
553 | ||
554 | return mca_recovered("user memory corruption. " | |
43ed3baf | 555 | "kill affected process - recovered."); |
1da177e4 LT |
556 | } |
557 | ||
43ed3baf HS |
558 | return fatal_mca("kernel context not recovered, iip 0x%lx\n", |
559 | pmsa->pmsa_iip); | |
1da177e4 LT |
560 | } |
561 | ||
562 | /** | |
563 | * recover_from_platform_error - Recover from platform error. | |
564 | * @slidx: pointer of index of SAL error record | |
565 | * @peidx: pointer of index of processor error section | |
566 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 567 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
568 | * |
569 | * Return value: | |
570 | * 1 on Success / 0 on Failure | |
571 | */ | |
572 | ||
573 | static int | |
20305e59 HS |
574 | recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx, |
575 | pal_bus_check_info_t *pbci, | |
7f613c7d | 576 | struct ia64_sal_os_state *sos) |
1da177e4 LT |
577 | { |
578 | int status = 0; | |
20305e59 HS |
579 | pal_processor_state_info_t *psp = |
580 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 LT |
581 | |
582 | if (psp->bc && pbci->eb && pbci->bsi == 0) { | |
583 | switch(pbci->type) { | |
584 | case 1: /* partial read */ | |
585 | case 3: /* full line(cpu) read */ | |
586 | case 9: /* I/O space read */ | |
20305e59 HS |
587 | status = recover_from_read_error(slidx, peidx, pbci, |
588 | sos); | |
1da177e4 LT |
589 | break; |
590 | case 0: /* unknown */ | |
591 | case 2: /* partial write */ | |
592 | case 4: /* full line write */ | |
593 | case 5: /* implicit or explicit write-back operation */ | |
594 | case 6: /* snoop probe */ | |
595 | case 7: /* incoming or outgoing ptc.g */ | |
596 | case 8: /* write coalescing transactions */ | |
597 | case 10: /* I/O space write */ | |
598 | case 11: /* inter-processor interrupt message(IPI) */ | |
20305e59 HS |
599 | case 12: /* interrupt acknowledge or |
600 | external task priority cycle */ | |
1da177e4 LT |
601 | default: |
602 | break; | |
603 | } | |
396e8e76 RA |
604 | } else if (psp->cc && !psp->bc) { /* Cache error */ |
605 | status = recover_from_read_error(slidx, peidx, pbci, sos); | |
1da177e4 LT |
606 | } |
607 | ||
608 | return status; | |
609 | } | |
610 | ||
618b206f RA |
611 | /* |
612 | * recover_from_tlb_check | |
613 | * @peidx: pointer of index of processor error section | |
614 | * | |
615 | * Return value: | |
616 | * 1 on Success / 0 on Failure | |
617 | */ | |
618 | static int | |
619 | recover_from_tlb_check(peidx_table_t *peidx) | |
620 | { | |
621 | sal_log_mod_error_info_t *smei; | |
622 | pal_tlb_check_info_t *ptci; | |
623 | ||
624 | smei = (sal_log_mod_error_info_t *)peidx_tlb_check(peidx, 0); | |
625 | ptci = (pal_tlb_check_info_t *)&(smei->check_info); | |
626 | ||
627 | /* | |
628 | * Look for signature of a duplicate TLB DTC entry, which is | |
629 | * a SW bug and always fatal. | |
630 | */ | |
631 | if (ptci->op == PAL_TLB_CHECK_OP_PURGE | |
632 | && !(ptci->itr || ptci->dtc || ptci->itc)) | |
633 | return fatal_mca("Duplicate TLB entry"); | |
634 | ||
635 | return mca_recovered("TLB check recovered"); | |
636 | } | |
637 | ||
1da177e4 LT |
638 | /** |
639 | * recover_from_processor_error | |
640 | * @platform: whether there are some platform error section or not | |
641 | * @slidx: pointer of index of SAL error record | |
642 | * @peidx: pointer of index of processor error section | |
643 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 644 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
645 | * |
646 | * Return value: | |
647 | * 1 on Success / 0 on Failure | |
648 | */ | |
1da177e4 LT |
649 | |
650 | static int | |
20305e59 HS |
651 | recover_from_processor_error(int platform, slidx_table_t *slidx, |
652 | peidx_table_t *peidx, pal_bus_check_info_t *pbci, | |
7f613c7d | 653 | struct ia64_sal_os_state *sos) |
1da177e4 | 654 | { |
20305e59 HS |
655 | pal_processor_state_info_t *psp = |
656 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 | 657 | |
20305e59 | 658 | /* |
a14f25a0 RA |
659 | * Processor recovery status must key off of the PAL recovery |
660 | * status in the Processor State Parameter. | |
1da177e4 | 661 | */ |
a14f25a0 RA |
662 | |
663 | /* | |
664 | * The machine check is corrected. | |
665 | */ | |
666 | if (psp->cm == 1) | |
43ed3baf | 667 | return mca_recovered("machine check is already corrected."); |
a14f25a0 RA |
668 | |
669 | /* | |
670 | * The error was not contained. Software must be reset. | |
671 | */ | |
672 | if (psp->us || psp->ci == 0) | |
43ed3baf | 673 | return fatal_mca("error not contained"); |
1da177e4 | 674 | |
618b206f RA |
675 | /* |
676 | * Look for recoverable TLB check | |
677 | */ | |
678 | if (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc)) | |
679 | return recover_from_tlb_check(peidx); | |
680 | ||
1da177e4 | 681 | /* |
e1c48554 RA |
682 | * The cache check and bus check bits have four possible states |
683 | * cc bc | |
e1c48554 | 684 | * 1 1 Memory error, attempt recovery |
396e8e76 RA |
685 | * 1 0 Cache error, attempt recovery |
686 | * 0 1 I/O error, attempt recovery | |
687 | * 0 0 Other error type, not recovered | |
1da177e4 | 688 | */ |
396e8e76 RA |
689 | if (psp->cc == 0 && (psp->bc == 0 || pbci == NULL)) |
690 | return fatal_mca("No cache or bus check"); | |
1da177e4 LT |
691 | |
692 | /* | |
396e8e76 | 693 | * Cannot handle more than one bus check. |
1da177e4 LT |
694 | */ |
695 | if (peidx_bus_check_num(peidx) > 1) | |
43ed3baf | 696 | return fatal_mca("Too many bus checks"); |
396e8e76 | 697 | |
18997961 | 698 | if (pbci->ib) |
43ed3baf | 699 | return fatal_mca("Internal Bus error"); |
1da177e4 | 700 | if (pbci->eb && pbci->bsi > 0) |
43ed3baf | 701 | return fatal_mca("External bus check fatal status"); |
1da177e4 LT |
702 | |
703 | /* | |
72fdbdce | 704 | * This is a local MCA and estimated as a recoverable error. |
1da177e4 | 705 | */ |
20305e59 | 706 | if (platform) |
7f613c7d | 707 | return recover_from_platform_error(slidx, peidx, pbci, sos); |
396e8e76 | 708 | |
20305e59 HS |
709 | /* |
710 | * On account of strange SAL error record, we cannot recover. | |
1da177e4 | 711 | */ |
43ed3baf | 712 | return fatal_mca("Strange SAL record"); |
1da177e4 LT |
713 | } |
714 | ||
715 | /** | |
716 | * mca_try_to_recover - Try to recover from MCA | |
717 | * @rec: pointer to a SAL error record | |
20305e59 | 718 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
719 | * |
720 | * Return value: | |
721 | * 1 on Success / 0 on Failure | |
722 | */ | |
723 | ||
724 | static int | |
20305e59 | 725 | mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos) |
1da177e4 LT |
726 | { |
727 | int platform_err; | |
728 | int n_proc_err; | |
729 | slidx_table_t slidx; | |
730 | peidx_table_t peidx; | |
731 | pal_bus_check_info_t pbci; | |
732 | ||
1da177e4 LT |
733 | /* Make index of SAL error record */ |
734 | platform_err = mca_make_slidx(rec, &slidx); | |
735 | ||
736 | /* Count processor error sections */ | |
737 | n_proc_err = slidx_count(&slidx, proc_err); | |
738 | ||
739 | /* Now, OS can recover when there is one processor error section */ | |
740 | if (n_proc_err > 1) | |
43ed3baf | 741 | return fatal_mca("Too Many Errors"); |
18997961 | 742 | else if (n_proc_err == 0) |
43ed3baf HS |
743 | /* Weird SAL record ... We can't do anything */ |
744 | return fatal_mca("Weird SAL record"); | |
1da177e4 LT |
745 | |
746 | /* Make index of processor error section */ | |
20305e59 HS |
747 | mca_make_peidx((sal_log_processor_info_t*) |
748 | slidx_first_entry(&slidx.proc_err)->hdr, &peidx); | |
1da177e4 LT |
749 | |
750 | /* Extract Processor BUS_CHECK[0] */ | |
751 | *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0); | |
752 | ||
753 | /* Check whether MCA is global or not */ | |
7f613c7d | 754 | if (is_mca_global(&peidx, &pbci, sos)) |
43ed3baf | 755 | return fatal_mca("global MCA"); |
1da177e4 LT |
756 | |
757 | /* Try to recover a processor error */ | |
20305e59 HS |
758 | return recover_from_processor_error(platform_err, &slidx, &peidx, |
759 | &pbci, sos); | |
1da177e4 LT |
760 | } |
761 | ||
762 | /* | |
763 | * ============================================================================= | |
764 | */ | |
765 | ||
766 | int __init mca_external_handler_init(void) | |
767 | { | |
768 | if (init_record_index_pools()) | |
769 | return -ENOMEM; | |
770 | ||
771 | /* register external mca handlers */ | |
20305e59 | 772 | if (ia64_reg_MCA_extension(mca_try_to_recover)) { |
1da177e4 LT |
773 | printk(KERN_ERR "ia64_reg_MCA_extension failed.\n"); |
774 | kfree(slidx_pool.buffer); | |
775 | return -EFAULT; | |
776 | } | |
777 | return 0; | |
778 | } | |
779 | ||
780 | void __exit mca_external_handler_exit(void) | |
781 | { | |
782 | /* unregister external mca handlers */ | |
783 | ia64_unreg_MCA_extension(); | |
784 | kfree(slidx_pool.buffer); | |
785 | } | |
786 | ||
787 | module_init(mca_external_handler_init); | |
788 | module_exit(mca_external_handler_exit); | |
789 | ||
790 | module_param(sal_rec_max, int, 0644); | |
791 | MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record"); | |
792 | ||
793 | MODULE_DESCRIPTION("ia64 platform dependent mca handler driver"); | |
794 | MODULE_LICENSE("GPL"); |