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> | |
1da177e4 LT |
9 | */ |
10 | #include <linux/config.h> | |
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 | ||
64 | /* | |
65 | * This pool keeps pointers to the section part of SAL error record | |
66 | */ | |
67 | static struct { | |
68 | slidx_list_t *buffer; /* section pointer list pool */ | |
69 | int cur_idx; /* Current index of section pointer list pool */ | |
70 | int max_idx; /* Maximum index of section pointer list pool */ | |
71 | } slidx_pool; | |
72 | ||
73 | /** | |
74 | * mca_page_isolate - isolate a poisoned page in order not to use it later | |
75 | * @paddr: poisoned memory location | |
76 | * | |
77 | * Return value: | |
4881e2cd | 78 | * one of isolate_status_t, ISOLATE_OK/NG/NONE. |
1da177e4 LT |
79 | */ |
80 | ||
81 | static isolate_status_t | |
82 | mca_page_isolate(unsigned long paddr) | |
83 | { | |
84 | int i; | |
85 | struct page *p; | |
86 | ||
87 | /* whether physical address is valid or not */ | |
20305e59 | 88 | if (!ia64_phys_addr_valid(paddr)) |
4881e2cd HS |
89 | return ISOLATE_NONE; |
90 | ||
56f87b82 | 91 | if (!pfn_valid(paddr >> PAGE_SHIFT)) |
4881e2cd | 92 | return ISOLATE_NONE; |
1da177e4 LT |
93 | |
94 | /* convert physical address to physical page number */ | |
95 | p = pfn_to_page(paddr>>PAGE_SHIFT); | |
96 | ||
97 | /* check whether a page number have been already registered or not */ | |
20305e59 HS |
98 | for (i = 0; i < num_page_isolate; i++) |
99 | if (page_isolate[i] == p) | |
1da177e4 LT |
100 | return ISOLATE_OK; /* already listed */ |
101 | ||
102 | /* limitation check */ | |
20305e59 | 103 | if (num_page_isolate == MAX_PAGE_ISOLATE) |
1da177e4 LT |
104 | return ISOLATE_NG; |
105 | ||
106 | /* kick pages having attribute 'SLAB' or 'Reserved' */ | |
20305e59 | 107 | if (PageSlab(p) || PageReserved(p)) |
1da177e4 LT |
108 | return ISOLATE_NG; |
109 | ||
110 | /* add attribute 'Reserved' and register the page */ | |
111 | SetPageReserved(p); | |
112 | page_isolate[num_page_isolate++] = p; | |
113 | ||
114 | return ISOLATE_OK; | |
115 | } | |
116 | ||
117 | /** | |
118 | * mca_hanlder_bh - Kill the process which occurred memory read error | |
119 | * @paddr: poisoned address received from MCA Handler | |
120 | */ | |
121 | ||
122 | void | |
123 | mca_handler_bh(unsigned long paddr) | |
124 | { | |
125 | printk(KERN_DEBUG "OS_MCA: process [pid: %d](%s) encounters MCA.\n", | |
126 | current->pid, current->comm); | |
127 | ||
128 | spin_lock(&mca_bh_lock); | |
4881e2cd HS |
129 | switch (mca_page_isolate(paddr)) { |
130 | case ISOLATE_OK: | |
1da177e4 | 131 | printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr); |
4881e2cd HS |
132 | break; |
133 | case ISOLATE_NG: | |
1da177e4 | 134 | printk(KERN_DEBUG "Page isolation: ( %lx ) failure.\n", paddr); |
4881e2cd HS |
135 | break; |
136 | default: | |
137 | break; | |
1da177e4 LT |
138 | } |
139 | spin_unlock(&mca_bh_lock); | |
140 | ||
141 | /* This process is about to be killed itself */ | |
b1b901c2 | 142 | do_exit(SIGKILL); |
1da177e4 LT |
143 | } |
144 | ||
145 | /** | |
146 | * mca_make_peidx - Make index of processor error section | |
147 | * @slpi: pointer to record of processor error section | |
148 | * @peidx: pointer to index of processor error section | |
149 | */ | |
150 | ||
20305e59 | 151 | static void |
1da177e4 LT |
152 | mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx) |
153 | { | |
20305e59 | 154 | /* |
1da177e4 LT |
155 | * calculate the start address of |
156 | * "struct cpuid_info" and "sal_processor_static_info_t". | |
157 | */ | |
158 | u64 total_check_num = slpi->valid.num_cache_check | |
159 | + slpi->valid.num_tlb_check | |
160 | + slpi->valid.num_bus_check | |
161 | + slpi->valid.num_reg_file_check | |
162 | + slpi->valid.num_ms_check; | |
163 | u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num | |
164 | + sizeof(sal_log_processor_info_t); | |
165 | u64 mid_size = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info); | |
166 | ||
167 | peidx_head(peidx) = slpi; | |
168 | peidx_mid(peidx) = (struct sal_cpuid_info *) | |
169 | (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL); | |
170 | peidx_bottom(peidx) = (sal_processor_static_info_t *) | |
171 | (slpi->valid.psi_static_struct ? | |
172 | ((char*)slpi + head_size + mid_size) : NULL); | |
173 | } | |
174 | ||
175 | /** | |
20305e59 | 176 | * mca_make_slidx - Make index of SAL error record |
1da177e4 LT |
177 | * @buffer: pointer to SAL error record |
178 | * @slidx: pointer to index of SAL error record | |
179 | * | |
180 | * Return value: | |
181 | * 1 if record has platform error / 0 if not | |
182 | */ | |
183 | #define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \ | |
20305e59 HS |
184 | {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \ |
185 | hl->hdr = ptr; \ | |
186 | list_add(&hl->list, &(sect)); \ | |
187 | slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; } | |
1da177e4 | 188 | |
20305e59 | 189 | static int |
1da177e4 LT |
190 | mca_make_slidx(void *buffer, slidx_table_t *slidx) |
191 | { | |
192 | int platform_err = 0; | |
193 | int record_len = ((sal_log_record_header_t*)buffer)->len; | |
194 | u32 ercd_pos; | |
195 | int sects; | |
196 | sal_log_section_hdr_t *sp; | |
197 | ||
198 | /* | |
199 | * Initialize index referring current record | |
200 | */ | |
201 | INIT_LIST_HEAD(&(slidx->proc_err)); | |
202 | INIT_LIST_HEAD(&(slidx->mem_dev_err)); | |
203 | INIT_LIST_HEAD(&(slidx->sel_dev_err)); | |
204 | INIT_LIST_HEAD(&(slidx->pci_bus_err)); | |
205 | INIT_LIST_HEAD(&(slidx->smbios_dev_err)); | |
206 | INIT_LIST_HEAD(&(slidx->pci_comp_err)); | |
207 | INIT_LIST_HEAD(&(slidx->plat_specific_err)); | |
208 | INIT_LIST_HEAD(&(slidx->host_ctlr_err)); | |
209 | INIT_LIST_HEAD(&(slidx->plat_bus_err)); | |
210 | INIT_LIST_HEAD(&(slidx->unsupported)); | |
211 | ||
212 | /* | |
213 | * Extract a Record Header | |
214 | */ | |
215 | slidx->header = buffer; | |
216 | ||
217 | /* | |
218 | * Extract each section records | |
219 | * (arranged from "int ia64_log_platform_info_print()") | |
220 | */ | |
221 | for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0; | |
222 | ercd_pos < record_len; ercd_pos += sp->len, sects++) { | |
223 | sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos); | |
224 | if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) { | |
225 | LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp); | |
20305e59 HS |
226 | } else if (!efi_guidcmp(sp->guid, |
227 | SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
228 | platform_err = 1; |
229 | LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp); | |
20305e59 HS |
230 | } else if (!efi_guidcmp(sp->guid, |
231 | SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
232 | platform_err = 1; |
233 | LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp); | |
20305e59 HS |
234 | } else if (!efi_guidcmp(sp->guid, |
235 | SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) { | |
1da177e4 LT |
236 | platform_err = 1; |
237 | LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp); | |
20305e59 HS |
238 | } else if (!efi_guidcmp(sp->guid, |
239 | SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) { | |
1da177e4 LT |
240 | platform_err = 1; |
241 | LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp); | |
20305e59 HS |
242 | } else if (!efi_guidcmp(sp->guid, |
243 | SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) { | |
1da177e4 LT |
244 | platform_err = 1; |
245 | LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp); | |
20305e59 HS |
246 | } else if (!efi_guidcmp(sp->guid, |
247 | SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) { | |
1da177e4 LT |
248 | platform_err = 1; |
249 | LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp); | |
20305e59 HS |
250 | } else if (!efi_guidcmp(sp->guid, |
251 | SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) { | |
1da177e4 LT |
252 | platform_err = 1; |
253 | LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp); | |
20305e59 HS |
254 | } else if (!efi_guidcmp(sp->guid, |
255 | SAL_PLAT_BUS_ERR_SECT_GUID)) { | |
1da177e4 LT |
256 | platform_err = 1; |
257 | LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp); | |
258 | } else { | |
259 | LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp); | |
260 | } | |
261 | } | |
262 | slidx->n_sections = sects; | |
263 | ||
264 | return platform_err; | |
265 | } | |
266 | ||
267 | /** | |
268 | * init_record_index_pools - Initialize pool of lists for SAL record index | |
269 | * | |
270 | * Return value: | |
271 | * 0 on Success / -ENOMEM on Failure | |
272 | */ | |
20305e59 | 273 | static int |
1da177e4 LT |
274 | init_record_index_pools(void) |
275 | { | |
276 | int i; | |
277 | int rec_max_size; /* Maximum size of SAL error records */ | |
278 | int sect_min_size; /* Minimum size of SAL error sections */ | |
279 | /* minimum size table of each section */ | |
20305e59 HS |
280 | static int sal_log_sect_min_sizes[] = { |
281 | sizeof(sal_log_processor_info_t) | |
282 | + sizeof(sal_processor_static_info_t), | |
1da177e4 LT |
283 | sizeof(sal_log_mem_dev_err_info_t), |
284 | sizeof(sal_log_sel_dev_err_info_t), | |
285 | sizeof(sal_log_pci_bus_err_info_t), | |
286 | sizeof(sal_log_smbios_dev_err_info_t), | |
287 | sizeof(sal_log_pci_comp_err_info_t), | |
288 | sizeof(sal_log_plat_specific_err_info_t), | |
289 | sizeof(sal_log_host_ctlr_err_info_t), | |
290 | sizeof(sal_log_plat_bus_err_info_t), | |
291 | }; | |
292 | ||
293 | /* | |
294 | * MCA handler cannot allocate new memory on flight, | |
295 | * so we preallocate enough memory to handle a SAL record. | |
296 | * | |
297 | * Initialize a handling set of slidx_pool: | |
298 | * 1. Pick up the max size of SAL error records | |
299 | * 2. Pick up the min size of SAL error sections | |
300 | * 3. Allocate the pool as enough to 2 SAL records | |
301 | * (now we can estimate the maxinum of section in a record.) | |
302 | */ | |
303 | ||
304 | /* - 1 - */ | |
305 | rec_max_size = sal_rec_max; | |
306 | ||
307 | /* - 2 - */ | |
308 | sect_min_size = sal_log_sect_min_sizes[0]; | |
309 | for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++) | |
310 | if (sect_min_size > sal_log_sect_min_sizes[i]) | |
311 | sect_min_size = sal_log_sect_min_sizes[i]; | |
312 | ||
313 | /* - 3 - */ | |
314 | slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1; | |
20305e59 HS |
315 | slidx_pool.buffer = (slidx_list_t *) |
316 | kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL); | |
1da177e4 LT |
317 | |
318 | return slidx_pool.buffer ? 0 : -ENOMEM; | |
319 | } | |
320 | ||
321 | ||
322 | /***************************************************************************** | |
323 | * Recovery functions * | |
324 | *****************************************************************************/ | |
325 | ||
326 | /** | |
327 | * is_mca_global - Check whether this MCA is global or not | |
328 | * @peidx: pointer of index of processor error section | |
329 | * @pbci: pointer to pal_bus_check_info_t | |
20305e59 | 330 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
331 | * |
332 | * Return value: | |
333 | * MCA_IS_LOCAL / MCA_IS_GLOBAL | |
334 | */ | |
335 | ||
336 | static mca_type_t | |
7f613c7d KO |
337 | is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci, |
338 | struct ia64_sal_os_state *sos) | |
1da177e4 | 339 | { |
20305e59 HS |
340 | pal_processor_state_info_t *psp = |
341 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 | 342 | |
20305e59 | 343 | /* |
1da177e4 | 344 | * PAL can request a rendezvous, if the MCA has a global scope. |
20305e59 | 345 | * If "rz_always" flag is set, SAL requests MCA rendezvous |
1da177e4 LT |
346 | * in spite of global MCA. |
347 | * Therefore it is local MCA when rendezvous has not been requested. | |
348 | * Failed to rendezvous, the system must be down. | |
349 | */ | |
7f613c7d | 350 | switch (sos->rv_rc) { |
1da177e4 LT |
351 | case -1: /* SAL rendezvous unsuccessful */ |
352 | return MCA_IS_GLOBAL; | |
353 | case 0: /* SAL rendezvous not required */ | |
354 | return MCA_IS_LOCAL; | |
355 | case 1: /* SAL rendezvous successful int */ | |
356 | case 2: /* SAL rendezvous successful int with init */ | |
357 | default: | |
358 | break; | |
359 | } | |
360 | ||
361 | /* | |
362 | * If One or more Cache/TLB/Reg_File/Uarch_Check is here, | |
363 | * it would be a local MCA. (i.e. processor internal error) | |
364 | */ | |
365 | if (psp->tc || psp->cc || psp->rc || psp->uc) | |
366 | return MCA_IS_LOCAL; | |
367 | ||
368 | /* | |
369 | * Bus_Check structure with Bus_Check.ib (internal bus error) flag set | |
370 | * would be a global MCA. (e.g. a system bus address parity error) | |
371 | */ | |
372 | if (!pbci || pbci->ib) | |
373 | return MCA_IS_GLOBAL; | |
374 | ||
375 | /* | |
376 | * Bus_Check structure with Bus_Check.eb (external bus error) flag set | |
377 | * could be either a local MCA or a global MCA. | |
378 | * | |
379 | * Referring Bus_Check.bsi: | |
380 | * 0: Unknown/unclassified | |
381 | * 1: BERR# | |
382 | * 2: BINIT# | |
383 | * 3: Hard Fail | |
384 | * (FIXME: Are these SGI specific or generic bsi values?) | |
385 | */ | |
386 | if (pbci->eb) | |
387 | switch (pbci->bsi) { | |
388 | case 0: | |
389 | /* e.g. a load from poisoned memory */ | |
390 | return MCA_IS_LOCAL; | |
391 | case 1: | |
392 | case 2: | |
393 | case 3: | |
394 | return MCA_IS_GLOBAL; | |
395 | } | |
396 | ||
397 | return MCA_IS_GLOBAL; | |
398 | } | |
399 | ||
400 | /** | |
401 | * recover_from_read_error - Try to recover the errors which type are "read"s. | |
402 | * @slidx: pointer of index of SAL error record | |
403 | * @peidx: pointer of index of processor error section | |
404 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 405 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
406 | * |
407 | * Return value: | |
408 | * 1 on Success / 0 on Failure | |
409 | */ | |
410 | ||
411 | static int | |
20305e59 HS |
412 | recover_from_read_error(slidx_table_t *slidx, |
413 | peidx_table_t *peidx, pal_bus_check_info_t *pbci, | |
7f613c7d | 414 | struct ia64_sal_os_state *sos) |
1da177e4 LT |
415 | { |
416 | sal_log_mod_error_info_t *smei; | |
417 | pal_min_state_area_t *pmsa; | |
418 | struct ia64_psr *psr1, *psr2; | |
419 | ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook; | |
420 | ||
421 | /* Is target address valid? */ | |
422 | if (!pbci->tv) | |
423 | return 0; | |
424 | ||
425 | /* | |
426 | * cpu read or memory-mapped io read | |
427 | * | |
428 | * offending process affected process OS MCA do | |
429 | * kernel mode kernel mode down system | |
430 | * kernel mode user mode kill the process | |
431 | * user mode kernel mode down system (*) | |
432 | * user mode user mode kill the process | |
433 | * | |
434 | * (*) You could terminate offending user-mode process | |
435 | * if (pbci->pv && pbci->pl != 0) *and* if you sure | |
436 | * the process not have any locks of kernel. | |
437 | */ | |
438 | ||
439 | psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr); | |
440 | ||
441 | /* | |
442 | * Check the privilege level of interrupted context. | |
443 | * If it is user-mode, then terminate affected process. | |
444 | */ | |
445 | if (psr1->cpl != 0) { | |
446 | smei = peidx_bus_check(peidx, 0); | |
447 | if (smei->valid.target_identifier) { | |
448 | /* | |
449 | * setup for resume to bottom half of MCA, | |
450 | * "mca_handler_bhhook" | |
451 | */ | |
7f613c7d | 452 | pmsa = sos->pal_min_state; |
1da177e4 LT |
453 | /* pass to bhhook as 1st argument (gr8) */ |
454 | pmsa->pmsa_gr[8-1] = smei->target_identifier; | |
455 | /* set interrupted return address (but no use) */ | |
456 | pmsa->pmsa_br0 = pmsa->pmsa_iip; | |
457 | /* change resume address to bottom half */ | |
458 | pmsa->pmsa_iip = mca_hdlr_bh->fp; | |
459 | pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp; | |
460 | /* set cpl with kernel mode */ | |
461 | psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr; | |
462 | psr2->cpl = 0; | |
463 | psr2->ri = 0; | |
b1b901c2 | 464 | psr2->i = 0; |
1da177e4 LT |
465 | |
466 | return 1; | |
467 | } | |
468 | ||
469 | } | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | /** | |
475 | * recover_from_platform_error - Recover from platform error. | |
476 | * @slidx: pointer of index of SAL error record | |
477 | * @peidx: pointer of index of processor error section | |
478 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 479 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
480 | * |
481 | * Return value: | |
482 | * 1 on Success / 0 on Failure | |
483 | */ | |
484 | ||
485 | static int | |
20305e59 HS |
486 | recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx, |
487 | pal_bus_check_info_t *pbci, | |
7f613c7d | 488 | struct ia64_sal_os_state *sos) |
1da177e4 LT |
489 | { |
490 | int status = 0; | |
20305e59 HS |
491 | pal_processor_state_info_t *psp = |
492 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 LT |
493 | |
494 | if (psp->bc && pbci->eb && pbci->bsi == 0) { | |
495 | switch(pbci->type) { | |
496 | case 1: /* partial read */ | |
497 | case 3: /* full line(cpu) read */ | |
498 | case 9: /* I/O space read */ | |
20305e59 HS |
499 | status = recover_from_read_error(slidx, peidx, pbci, |
500 | sos); | |
1da177e4 LT |
501 | break; |
502 | case 0: /* unknown */ | |
503 | case 2: /* partial write */ | |
504 | case 4: /* full line write */ | |
505 | case 5: /* implicit or explicit write-back operation */ | |
506 | case 6: /* snoop probe */ | |
507 | case 7: /* incoming or outgoing ptc.g */ | |
508 | case 8: /* write coalescing transactions */ | |
509 | case 10: /* I/O space write */ | |
510 | case 11: /* inter-processor interrupt message(IPI) */ | |
20305e59 HS |
511 | case 12: /* interrupt acknowledge or |
512 | external task priority cycle */ | |
1da177e4 LT |
513 | default: |
514 | break; | |
515 | } | |
516 | } | |
517 | ||
518 | return status; | |
519 | } | |
520 | ||
521 | /** | |
522 | * recover_from_processor_error | |
523 | * @platform: whether there are some platform error section or not | |
524 | * @slidx: pointer of index of SAL error record | |
525 | * @peidx: pointer of index of processor error section | |
526 | * @pbci: pointer of pal_bus_check_info | |
20305e59 | 527 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
528 | * |
529 | * Return value: | |
530 | * 1 on Success / 0 on Failure | |
531 | */ | |
532 | /* | |
533 | * Later we try to recover when below all conditions are satisfied. | |
534 | * 1. Only one processor error section is exist. | |
535 | * 2. BUS_CHECK is exist and the others are not exist.(Except TLB_CHECK) | |
536 | * 3. The entry of BUS_CHECK_INFO is 1. | |
537 | * 4. "External bus error" flag is set and the others are not set. | |
538 | */ | |
539 | ||
540 | static int | |
20305e59 HS |
541 | recover_from_processor_error(int platform, slidx_table_t *slidx, |
542 | peidx_table_t *peidx, pal_bus_check_info_t *pbci, | |
7f613c7d | 543 | struct ia64_sal_os_state *sos) |
1da177e4 | 544 | { |
20305e59 HS |
545 | pal_processor_state_info_t *psp = |
546 | (pal_processor_state_info_t*)peidx_psp(peidx); | |
1da177e4 | 547 | |
20305e59 | 548 | /* |
1da177e4 LT |
549 | * We cannot recover errors with other than bus_check. |
550 | */ | |
20305e59 | 551 | if (psp->cc || psp->rc || psp->uc) |
1da177e4 LT |
552 | return 0; |
553 | ||
554 | /* | |
555 | * If there is no bus error, record is weird but we need not to recover. | |
556 | */ | |
557 | if (psp->bc == 0 || pbci == NULL) | |
558 | return 1; | |
559 | ||
560 | /* | |
561 | * Sorry, we cannot handle so many. | |
562 | */ | |
563 | if (peidx_bus_check_num(peidx) > 1) | |
564 | return 0; | |
565 | /* | |
566 | * Well, here is only one bus error. | |
567 | */ | |
568 | if (pbci->ib || pbci->cc) | |
569 | return 0; | |
570 | if (pbci->eb && pbci->bsi > 0) | |
571 | return 0; | |
572 | if (psp->ci == 0) | |
573 | return 0; | |
574 | ||
575 | /* | |
576 | * This is a local MCA and estimated as recoverble external bus error. | |
577 | * (e.g. a load from poisoned memory) | |
578 | * This means "there are some platform errors". | |
579 | */ | |
20305e59 | 580 | if (platform) |
7f613c7d | 581 | return recover_from_platform_error(slidx, peidx, pbci, sos); |
20305e59 HS |
582 | /* |
583 | * On account of strange SAL error record, we cannot recover. | |
1da177e4 LT |
584 | */ |
585 | return 0; | |
586 | } | |
587 | ||
588 | /** | |
589 | * mca_try_to_recover - Try to recover from MCA | |
590 | * @rec: pointer to a SAL error record | |
20305e59 | 591 | * @sos: pointer to hand off struct between SAL and OS |
1da177e4 LT |
592 | * |
593 | * Return value: | |
594 | * 1 on Success / 0 on Failure | |
595 | */ | |
596 | ||
597 | static int | |
20305e59 | 598 | mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos) |
1da177e4 LT |
599 | { |
600 | int platform_err; | |
601 | int n_proc_err; | |
602 | slidx_table_t slidx; | |
603 | peidx_table_t peidx; | |
604 | pal_bus_check_info_t pbci; | |
605 | ||
1da177e4 LT |
606 | /* Make index of SAL error record */ |
607 | platform_err = mca_make_slidx(rec, &slidx); | |
608 | ||
609 | /* Count processor error sections */ | |
610 | n_proc_err = slidx_count(&slidx, proc_err); | |
611 | ||
612 | /* Now, OS can recover when there is one processor error section */ | |
613 | if (n_proc_err > 1) | |
614 | return 0; | |
615 | else if (n_proc_err == 0) { | |
616 | /* Weird SAL record ... We need not to recover */ | |
617 | ||
618 | return 1; | |
619 | } | |
620 | ||
621 | /* Make index of processor error section */ | |
20305e59 HS |
622 | mca_make_peidx((sal_log_processor_info_t*) |
623 | slidx_first_entry(&slidx.proc_err)->hdr, &peidx); | |
1da177e4 LT |
624 | |
625 | /* Extract Processor BUS_CHECK[0] */ | |
626 | *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0); | |
627 | ||
628 | /* Check whether MCA is global or not */ | |
7f613c7d | 629 | if (is_mca_global(&peidx, &pbci, sos)) |
1da177e4 LT |
630 | return 0; |
631 | ||
632 | /* Try to recover a processor error */ | |
20305e59 HS |
633 | return recover_from_processor_error(platform_err, &slidx, &peidx, |
634 | &pbci, sos); | |
1da177e4 LT |
635 | } |
636 | ||
637 | /* | |
638 | * ============================================================================= | |
639 | */ | |
640 | ||
641 | int __init mca_external_handler_init(void) | |
642 | { | |
643 | if (init_record_index_pools()) | |
644 | return -ENOMEM; | |
645 | ||
646 | /* register external mca handlers */ | |
20305e59 | 647 | if (ia64_reg_MCA_extension(mca_try_to_recover)) { |
1da177e4 LT |
648 | printk(KERN_ERR "ia64_reg_MCA_extension failed.\n"); |
649 | kfree(slidx_pool.buffer); | |
650 | return -EFAULT; | |
651 | } | |
652 | return 0; | |
653 | } | |
654 | ||
655 | void __exit mca_external_handler_exit(void) | |
656 | { | |
657 | /* unregister external mca handlers */ | |
658 | ia64_unreg_MCA_extension(); | |
659 | kfree(slidx_pool.buffer); | |
660 | } | |
661 | ||
662 | module_init(mca_external_handler_init); | |
663 | module_exit(mca_external_handler_exit); | |
664 | ||
665 | module_param(sal_rec_max, int, 0644); | |
666 | MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record"); | |
667 | ||
668 | MODULE_DESCRIPTION("ia64 platform dependent mca handler driver"); | |
669 | MODULE_LICENSE("GPL"); |