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e1e86ee0 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6c2b374d | 2 | /* |
df62ab5e BH |
3 | * Implement the AER root port service driver. The driver registers an IRQ |
4 | * handler. When a root port triggers an AER interrupt, the IRQ handler | |
5 | * collects root port status and schedules work. | |
6c2b374d ZY |
6 | * |
7 | * Copyright (C) 2006 Intel Corp. | |
8 | * Tom Long Nguyen (tom.l.nguyen@intel.com) | |
9 | * Zhang Yanmin (yanmin.zhang@intel.com) | |
41cbc9eb BH |
10 | * |
11 | * (C) Copyright 2009 Hewlett-Packard Development Company, L.P. | |
12 | * Andrew Patterson <andrew.patterson@hp.com> | |
6c2b374d ZY |
13 | */ |
14 | ||
0319c9a0 | 15 | #include <linux/cper.h> |
6c2b374d | 16 | #include <linux/pci.h> |
415e12b2 | 17 | #include <linux/pci-acpi.h> |
d43c36dc | 18 | #include <linux/sched.h> |
6c2b374d ZY |
19 | #include <linux/kernel.h> |
20 | #include <linux/errno.h> | |
21 | #include <linux/pm.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/delay.h> | |
fd3362cb | 25 | #include <linux/kfifo.h> |
5a0e3ad6 | 26 | #include <linux/slab.h> |
256a4593 | 27 | #include <acpi/apei.h> |
0319c9a0 | 28 | #include <ras/ras_event.h> |
6c2b374d | 29 | |
4696b828 BH |
30 | #include "../pci.h" |
31 | #include "portdrv.h" | |
23e672bc BH |
32 | |
33 | #define AER_ERROR_SOURCES_MAX 100 | |
23e672bc | 34 | |
db89ccbe RJ |
35 | #define AER_MAX_TYPEOF_COR_ERRS 16 /* as per PCI_ERR_COR_STATUS */ |
36 | #define AER_MAX_TYPEOF_UNCOR_ERRS 26 /* as per PCI_ERR_UNCOR_STATUS*/ | |
37 | ||
23e672bc BH |
38 | struct aer_err_source { |
39 | unsigned int status; | |
40 | unsigned int id; | |
41 | }; | |
42 | ||
43 | struct aer_rpc { | |
44 | struct pci_dev *rpd; /* Root Port device */ | |
45 | struct work_struct dpc_handler; | |
46 | struct aer_err_source e_sources[AER_ERROR_SOURCES_MAX]; | |
47 | struct aer_err_info e_info; | |
48 | unsigned short prod_idx; /* Error Producer Index */ | |
49 | unsigned short cons_idx; /* Error Consumer Index */ | |
50 | int isr; | |
51 | spinlock_t e_lock; /* | |
52 | * Lock access to Error Status/ID Regs | |
53 | * and error producer/consumer index | |
54 | */ | |
55 | struct mutex rpc_mutex; /* | |
56 | * only one thread could do | |
57 | * recovery on the same | |
58 | * root port hierarchy | |
59 | */ | |
60 | }; | |
61 | ||
db89ccbe RJ |
62 | /* AER stats for the device */ |
63 | struct aer_stats { | |
64 | ||
65 | /* | |
66 | * Fields for all AER capable devices. They indicate the errors | |
67 | * "as seen by this device". Note that this may mean that if an | |
68 | * end point is causing problems, the AER counters may increment | |
69 | * at its link partner (e.g. root port) because the errors will be | |
70 | * "seen" by the link partner and not the the problematic end point | |
71 | * itself (which may report all counters as 0 as it never saw any | |
72 | * problems). | |
73 | */ | |
74 | /* Counters for different type of correctable errors */ | |
75 | u64 dev_cor_errs[AER_MAX_TYPEOF_COR_ERRS]; | |
76 | /* Counters for different type of fatal uncorrectable errors */ | |
77 | u64 dev_fatal_errs[AER_MAX_TYPEOF_UNCOR_ERRS]; | |
78 | /* Counters for different type of nonfatal uncorrectable errors */ | |
79 | u64 dev_nonfatal_errs[AER_MAX_TYPEOF_UNCOR_ERRS]; | |
80 | /* Total number of ERR_COR sent by this device */ | |
81 | u64 dev_total_cor_errs; | |
82 | /* Total number of ERR_FATAL sent by this device */ | |
83 | u64 dev_total_fatal_errs; | |
84 | /* Total number of ERR_NONFATAL sent by this device */ | |
85 | u64 dev_total_nonfatal_errs; | |
86 | ||
87 | /* | |
88 | * Fields for Root ports & root complex event collectors only, these | |
89 | * indicate the total number of ERR_COR, ERR_FATAL, and ERR_NONFATAL | |
90 | * messages received by the root port / event collector, INCLUDING the | |
91 | * ones that are generated internally (by the rootport itself) | |
92 | */ | |
93 | u64 rootport_total_cor_errs; | |
94 | u64 rootport_total_fatal_errs; | |
95 | u64 rootport_total_nonfatal_errs; | |
96 | }; | |
97 | ||
23e672bc BH |
98 | #define AER_LOG_TLP_MASKS (PCI_ERR_UNC_POISON_TLP| \ |
99 | PCI_ERR_UNC_ECRC| \ | |
100 | PCI_ERR_UNC_UNSUP| \ | |
101 | PCI_ERR_UNC_COMP_ABORT| \ | |
102 | PCI_ERR_UNC_UNX_COMP| \ | |
103 | PCI_ERR_UNC_MALF_TLP) | |
104 | ||
105 | #define SYSTEM_ERROR_INTR_ON_MESG_MASK (PCI_EXP_RTCTL_SECEE| \ | |
106 | PCI_EXP_RTCTL_SENFEE| \ | |
107 | PCI_EXP_RTCTL_SEFEE) | |
108 | #define ROOT_PORT_INTR_ON_MESG_MASK (PCI_ERR_ROOT_CMD_COR_EN| \ | |
109 | PCI_ERR_ROOT_CMD_NONFATAL_EN| \ | |
110 | PCI_ERR_ROOT_CMD_FATAL_EN) | |
111 | #define ERR_COR_ID(d) (d & 0xffff) | |
112 | #define ERR_UNCOR_ID(d) (d >> 16) | |
6c2b374d | 113 | |
7f785763 RD |
114 | static int pcie_aer_disable; |
115 | ||
116 | void pci_no_aer(void) | |
117 | { | |
7ece1417 | 118 | pcie_aer_disable = 1; |
7f785763 RD |
119 | } |
120 | ||
f1a7bfaf RW |
121 | bool pci_aer_available(void) |
122 | { | |
123 | return !pcie_aer_disable && pci_msi_enabled(); | |
124 | } | |
125 | ||
41cbc9eb BH |
126 | #ifdef CONFIG_PCIE_ECRC |
127 | ||
128 | #define ECRC_POLICY_DEFAULT 0 /* ECRC set by BIOS */ | |
129 | #define ECRC_POLICY_OFF 1 /* ECRC off for performance */ | |
130 | #define ECRC_POLICY_ON 2 /* ECRC on for data integrity */ | |
131 | ||
132 | static int ecrc_policy = ECRC_POLICY_DEFAULT; | |
133 | ||
134 | static const char *ecrc_policy_str[] = { | |
135 | [ECRC_POLICY_DEFAULT] = "bios", | |
136 | [ECRC_POLICY_OFF] = "off", | |
137 | [ECRC_POLICY_ON] = "on" | |
138 | }; | |
139 | ||
140 | /** | |
141 | * enable_ercr_checking - enable PCIe ECRC checking for a device | |
142 | * @dev: the PCI device | |
143 | * | |
144 | * Returns 0 on success, or negative on failure. | |
145 | */ | |
146 | static int enable_ecrc_checking(struct pci_dev *dev) | |
147 | { | |
148 | int pos; | |
149 | u32 reg32; | |
150 | ||
151 | if (!pci_is_pcie(dev)) | |
152 | return -ENODEV; | |
153 | ||
154 | pos = dev->aer_cap; | |
155 | if (!pos) | |
156 | return -ENODEV; | |
157 | ||
158 | pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32); | |
159 | if (reg32 & PCI_ERR_CAP_ECRC_GENC) | |
160 | reg32 |= PCI_ERR_CAP_ECRC_GENE; | |
161 | if (reg32 & PCI_ERR_CAP_ECRC_CHKC) | |
162 | reg32 |= PCI_ERR_CAP_ECRC_CHKE; | |
163 | pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | /** | |
169 | * disable_ercr_checking - disables PCIe ECRC checking for a device | |
170 | * @dev: the PCI device | |
171 | * | |
172 | * Returns 0 on success, or negative on failure. | |
173 | */ | |
174 | static int disable_ecrc_checking(struct pci_dev *dev) | |
175 | { | |
176 | int pos; | |
177 | u32 reg32; | |
178 | ||
179 | if (!pci_is_pcie(dev)) | |
180 | return -ENODEV; | |
181 | ||
182 | pos = dev->aer_cap; | |
183 | if (!pos) | |
184 | return -ENODEV; | |
185 | ||
186 | pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32); | |
187 | reg32 &= ~(PCI_ERR_CAP_ECRC_GENE | PCI_ERR_CAP_ECRC_CHKE); | |
188 | pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | /** | |
194 | * pcie_set_ecrc_checking - set/unset PCIe ECRC checking for a device based on global policy | |
195 | * @dev: the PCI device | |
196 | */ | |
197 | void pcie_set_ecrc_checking(struct pci_dev *dev) | |
198 | { | |
199 | switch (ecrc_policy) { | |
200 | case ECRC_POLICY_DEFAULT: | |
201 | return; | |
202 | case ECRC_POLICY_OFF: | |
203 | disable_ecrc_checking(dev); | |
204 | break; | |
205 | case ECRC_POLICY_ON: | |
206 | enable_ecrc_checking(dev); | |
207 | break; | |
208 | default: | |
209 | return; | |
210 | } | |
211 | } | |
212 | ||
213 | /** | |
214 | * pcie_ecrc_get_policy - parse kernel command-line ecrc option | |
215 | */ | |
216 | void pcie_ecrc_get_policy(char *str) | |
217 | { | |
218 | int i; | |
219 | ||
220 | for (i = 0; i < ARRAY_SIZE(ecrc_policy_str); i++) | |
221 | if (!strncmp(str, ecrc_policy_str[i], | |
222 | strlen(ecrc_policy_str[i]))) | |
223 | break; | |
224 | if (i >= ARRAY_SIZE(ecrc_policy_str)) | |
225 | return; | |
226 | ||
227 | ecrc_policy = i; | |
228 | } | |
229 | #endif /* CONFIG_PCIE_ECRC */ | |
230 | ||
256a4593 BH |
231 | #ifdef CONFIG_ACPI_APEI |
232 | static inline int hest_match_pci(struct acpi_hest_aer_common *p, | |
233 | struct pci_dev *pci) | |
234 | { | |
235 | return ACPI_HEST_SEGMENT(p->bus) == pci_domain_nr(pci->bus) && | |
236 | ACPI_HEST_BUS(p->bus) == pci->bus->number && | |
237 | p->device == PCI_SLOT(pci->devfn) && | |
238 | p->function == PCI_FUNC(pci->devfn); | |
239 | } | |
240 | ||
241 | static inline bool hest_match_type(struct acpi_hest_header *hest_hdr, | |
242 | struct pci_dev *dev) | |
243 | { | |
244 | u16 hest_type = hest_hdr->type; | |
245 | u8 pcie_type = pci_pcie_type(dev); | |
246 | ||
247 | if ((hest_type == ACPI_HEST_TYPE_AER_ROOT_PORT && | |
248 | pcie_type == PCI_EXP_TYPE_ROOT_PORT) || | |
249 | (hest_type == ACPI_HEST_TYPE_AER_ENDPOINT && | |
250 | pcie_type == PCI_EXP_TYPE_ENDPOINT) || | |
251 | (hest_type == ACPI_HEST_TYPE_AER_BRIDGE && | |
252 | (dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)) | |
253 | return true; | |
254 | return false; | |
255 | } | |
256 | ||
257 | struct aer_hest_parse_info { | |
258 | struct pci_dev *pci_dev; | |
259 | int firmware_first; | |
260 | }; | |
261 | ||
262 | static int hest_source_is_pcie_aer(struct acpi_hest_header *hest_hdr) | |
263 | { | |
264 | if (hest_hdr->type == ACPI_HEST_TYPE_AER_ROOT_PORT || | |
265 | hest_hdr->type == ACPI_HEST_TYPE_AER_ENDPOINT || | |
266 | hest_hdr->type == ACPI_HEST_TYPE_AER_BRIDGE) | |
267 | return 1; | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static int aer_hest_parse(struct acpi_hest_header *hest_hdr, void *data) | |
272 | { | |
273 | struct aer_hest_parse_info *info = data; | |
274 | struct acpi_hest_aer_common *p; | |
275 | int ff; | |
276 | ||
277 | if (!hest_source_is_pcie_aer(hest_hdr)) | |
278 | return 0; | |
279 | ||
280 | p = (struct acpi_hest_aer_common *)(hest_hdr + 1); | |
281 | ff = !!(p->flags & ACPI_HEST_FIRMWARE_FIRST); | |
282 | ||
283 | /* | |
284 | * If no specific device is supplied, determine whether | |
285 | * FIRMWARE_FIRST is set for *any* PCIe device. | |
286 | */ | |
287 | if (!info->pci_dev) { | |
288 | info->firmware_first |= ff; | |
289 | return 0; | |
290 | } | |
291 | ||
292 | /* Otherwise, check the specific device */ | |
293 | if (p->flags & ACPI_HEST_GLOBAL) { | |
294 | if (hest_match_type(hest_hdr, info->pci_dev)) | |
295 | info->firmware_first = ff; | |
296 | } else | |
297 | if (hest_match_pci(p, info->pci_dev)) | |
298 | info->firmware_first = ff; | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static void aer_set_firmware_first(struct pci_dev *pci_dev) | |
304 | { | |
305 | int rc; | |
306 | struct aer_hest_parse_info info = { | |
307 | .pci_dev = pci_dev, | |
308 | .firmware_first = 0, | |
309 | }; | |
310 | ||
311 | rc = apei_hest_parse(aer_hest_parse, &info); | |
312 | ||
313 | if (rc) | |
314 | pci_dev->__aer_firmware_first = 0; | |
315 | else | |
316 | pci_dev->__aer_firmware_first = info.firmware_first; | |
317 | pci_dev->__aer_firmware_first_valid = 1; | |
318 | } | |
319 | ||
320 | int pcie_aer_get_firmware_first(struct pci_dev *dev) | |
321 | { | |
322 | if (!pci_is_pcie(dev)) | |
323 | return 0; | |
324 | ||
7af02fcd AG |
325 | if (pcie_ports_native) |
326 | return 0; | |
327 | ||
256a4593 BH |
328 | if (!dev->__aer_firmware_first_valid) |
329 | aer_set_firmware_first(dev); | |
330 | return dev->__aer_firmware_first; | |
331 | } | |
332 | ||
333 | static bool aer_firmware_first; | |
334 | ||
335 | /** | |
336 | * aer_acpi_firmware_first - Check if APEI should control AER. | |
337 | */ | |
338 | bool aer_acpi_firmware_first(void) | |
339 | { | |
340 | static bool parsed = false; | |
341 | struct aer_hest_parse_info info = { | |
342 | .pci_dev = NULL, /* Check all PCIe devices */ | |
343 | .firmware_first = 0, | |
344 | }; | |
345 | ||
7af02fcd AG |
346 | if (pcie_ports_native) |
347 | return false; | |
348 | ||
256a4593 BH |
349 | if (!parsed) { |
350 | apei_hest_parse(aer_hest_parse, &info); | |
351 | aer_firmware_first = info.firmware_first; | |
352 | parsed = true; | |
353 | } | |
354 | return aer_firmware_first; | |
355 | } | |
356 | #endif | |
357 | ||
fd3362cb BH |
358 | #define PCI_EXP_AER_FLAGS (PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \ |
359 | PCI_EXP_DEVCTL_FERE | PCI_EXP_DEVCTL_URRE) | |
360 | ||
361 | int pci_enable_pcie_error_reporting(struct pci_dev *dev) | |
362 | { | |
363 | if (pcie_aer_get_firmware_first(dev)) | |
364 | return -EIO; | |
365 | ||
366 | if (!dev->aer_cap) | |
367 | return -EIO; | |
368 | ||
369 | return pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_AER_FLAGS); | |
370 | } | |
371 | EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting); | |
372 | ||
373 | int pci_disable_pcie_error_reporting(struct pci_dev *dev) | |
374 | { | |
375 | if (pcie_aer_get_firmware_first(dev)) | |
376 | return -EIO; | |
377 | ||
378 | return pcie_capability_clear_word(dev, PCI_EXP_DEVCTL, | |
379 | PCI_EXP_AER_FLAGS); | |
380 | } | |
381 | EXPORT_SYMBOL_GPL(pci_disable_pcie_error_reporting); | |
382 | ||
ec752f5d OP |
383 | void pci_aer_clear_device_status(struct pci_dev *dev) |
384 | { | |
385 | u16 sta; | |
386 | ||
387 | pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &sta); | |
388 | pcie_capability_write_word(dev, PCI_EXP_DEVSTA, sta); | |
389 | } | |
390 | ||
fd3362cb BH |
391 | int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) |
392 | { | |
393 | int pos; | |
e7b0b847 | 394 | u32 status, sev; |
fd3362cb BH |
395 | |
396 | pos = dev->aer_cap; | |
397 | if (!pos) | |
398 | return -EIO; | |
399 | ||
45687f96 AG |
400 | if (pcie_aer_get_firmware_first(dev)) |
401 | return -EIO; | |
402 | ||
e7b0b847 | 403 | /* Clear status bits for ERR_NONFATAL errors only */ |
fd3362cb | 404 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); |
e7b0b847 OP |
405 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev); |
406 | status &= ~sev; | |
fd3362cb BH |
407 | if (status) |
408 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status); | |
409 | ||
410 | return 0; | |
411 | } | |
412 | EXPORT_SYMBOL_GPL(pci_cleanup_aer_uncorrect_error_status); | |
413 | ||
7ab92e89 BH |
414 | void pci_aer_clear_fatal_status(struct pci_dev *dev) |
415 | { | |
416 | int pos; | |
417 | u32 status, sev; | |
418 | ||
419 | pos = dev->aer_cap; | |
420 | if (!pos) | |
421 | return; | |
422 | ||
45687f96 AG |
423 | if (pcie_aer_get_firmware_first(dev)) |
424 | return; | |
425 | ||
7ab92e89 BH |
426 | /* Clear status bits for ERR_FATAL errors only */ |
427 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); | |
428 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev); | |
429 | status &= sev; | |
430 | if (status) | |
431 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status); | |
432 | } | |
433 | ||
fd3362cb BH |
434 | int pci_cleanup_aer_error_status_regs(struct pci_dev *dev) |
435 | { | |
436 | int pos; | |
437 | u32 status; | |
438 | int port_type; | |
439 | ||
440 | if (!pci_is_pcie(dev)) | |
441 | return -ENODEV; | |
442 | ||
443 | pos = dev->aer_cap; | |
444 | if (!pos) | |
445 | return -EIO; | |
446 | ||
45687f96 AG |
447 | if (pcie_aer_get_firmware_first(dev)) |
448 | return -EIO; | |
449 | ||
fd3362cb BH |
450 | port_type = pci_pcie_type(dev); |
451 | if (port_type == PCI_EXP_TYPE_ROOT_PORT) { | |
452 | pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status); | |
453 | pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, status); | |
454 | } | |
455 | ||
456 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status); | |
457 | pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, status); | |
458 | ||
459 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); | |
460 | pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, status); | |
461 | ||
462 | return 0; | |
463 | } | |
464 | ||
60ed982a | 465 | void pci_aer_init(struct pci_dev *dev) |
fd3362cb BH |
466 | { |
467 | dev->aer_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); | |
db89ccbe RJ |
468 | |
469 | if (dev->aer_cap) | |
470 | dev->aer_stats = kzalloc(sizeof(struct aer_stats), GFP_KERNEL); | |
471 | ||
60ed982a | 472 | pci_cleanup_aer_error_status_regs(dev); |
fd3362cb BH |
473 | } |
474 | ||
db89ccbe RJ |
475 | void pci_aer_exit(struct pci_dev *dev) |
476 | { | |
477 | kfree(dev->aer_stats); | |
478 | dev->aer_stats = NULL; | |
479 | } | |
480 | ||
0319c9a0 BH |
481 | #define AER_AGENT_RECEIVER 0 |
482 | #define AER_AGENT_REQUESTER 1 | |
483 | #define AER_AGENT_COMPLETER 2 | |
484 | #define AER_AGENT_TRANSMITTER 3 | |
485 | ||
486 | #define AER_AGENT_REQUESTER_MASK(t) ((t == AER_CORRECTABLE) ? \ | |
487 | 0 : (PCI_ERR_UNC_COMP_TIME|PCI_ERR_UNC_UNSUP)) | |
488 | #define AER_AGENT_COMPLETER_MASK(t) ((t == AER_CORRECTABLE) ? \ | |
489 | 0 : PCI_ERR_UNC_COMP_ABORT) | |
490 | #define AER_AGENT_TRANSMITTER_MASK(t) ((t == AER_CORRECTABLE) ? \ | |
491 | (PCI_ERR_COR_REP_ROLL|PCI_ERR_COR_REP_TIMER) : 0) | |
492 | ||
493 | #define AER_GET_AGENT(t, e) \ | |
494 | ((e & AER_AGENT_COMPLETER_MASK(t)) ? AER_AGENT_COMPLETER : \ | |
495 | (e & AER_AGENT_REQUESTER_MASK(t)) ? AER_AGENT_REQUESTER : \ | |
496 | (e & AER_AGENT_TRANSMITTER_MASK(t)) ? AER_AGENT_TRANSMITTER : \ | |
497 | AER_AGENT_RECEIVER) | |
498 | ||
499 | #define AER_PHYSICAL_LAYER_ERROR 0 | |
500 | #define AER_DATA_LINK_LAYER_ERROR 1 | |
501 | #define AER_TRANSACTION_LAYER_ERROR 2 | |
502 | ||
503 | #define AER_PHYSICAL_LAYER_ERROR_MASK(t) ((t == AER_CORRECTABLE) ? \ | |
504 | PCI_ERR_COR_RCVR : 0) | |
505 | #define AER_DATA_LINK_LAYER_ERROR_MASK(t) ((t == AER_CORRECTABLE) ? \ | |
506 | (PCI_ERR_COR_BAD_TLP| \ | |
507 | PCI_ERR_COR_BAD_DLLP| \ | |
508 | PCI_ERR_COR_REP_ROLL| \ | |
509 | PCI_ERR_COR_REP_TIMER) : PCI_ERR_UNC_DLP) | |
510 | ||
511 | #define AER_GET_LAYER_ERROR(t, e) \ | |
512 | ((e & AER_PHYSICAL_LAYER_ERROR_MASK(t)) ? AER_PHYSICAL_LAYER_ERROR : \ | |
513 | (e & AER_DATA_LINK_LAYER_ERROR_MASK(t)) ? AER_DATA_LINK_LAYER_ERROR : \ | |
514 | AER_TRANSACTION_LAYER_ERROR) | |
515 | ||
516 | /* | |
517 | * AER error strings | |
518 | */ | |
519 | static const char *aer_error_severity_string[] = { | |
520 | "Uncorrected (Non-Fatal)", | |
521 | "Uncorrected (Fatal)", | |
522 | "Corrected" | |
523 | }; | |
524 | ||
525 | static const char *aer_error_layer[] = { | |
526 | "Physical Layer", | |
527 | "Data Link Layer", | |
528 | "Transaction Layer" | |
529 | }; | |
530 | ||
db89ccbe | 531 | static const char *aer_correctable_error_string[AER_MAX_TYPEOF_COR_ERRS] = { |
bd237801 | 532 | "RxErr", /* Bit Position 0 */ |
0319c9a0 BH |
533 | NULL, |
534 | NULL, | |
535 | NULL, | |
536 | NULL, | |
537 | NULL, | |
bd237801 TB |
538 | "BadTLP", /* Bit Position 6 */ |
539 | "BadDLLP", /* Bit Position 7 */ | |
540 | "Rollover", /* Bit Position 8 */ | |
0319c9a0 BH |
541 | NULL, |
542 | NULL, | |
543 | NULL, | |
bd237801 TB |
544 | "Timeout", /* Bit Position 12 */ |
545 | "NonFatalErr", /* Bit Position 13 */ | |
546 | "CorrIntErr", /* Bit Position 14 */ | |
547 | "HeaderOF", /* Bit Position 15 */ | |
0319c9a0 BH |
548 | }; |
549 | ||
db89ccbe | 550 | static const char *aer_uncorrectable_error_string[AER_MAX_TYPEOF_UNCOR_ERRS] = { |
0319c9a0 BH |
551 | "Undefined", /* Bit Position 0 */ |
552 | NULL, | |
553 | NULL, | |
554 | NULL, | |
bd237801 TB |
555 | "DLP", /* Bit Position 4 */ |
556 | "SDES", /* Bit Position 5 */ | |
0319c9a0 BH |
557 | NULL, |
558 | NULL, | |
559 | NULL, | |
560 | NULL, | |
561 | NULL, | |
562 | NULL, | |
bd237801 TB |
563 | "TLP", /* Bit Position 12 */ |
564 | "FCP", /* Bit Position 13 */ | |
565 | "CmpltTO", /* Bit Position 14 */ | |
566 | "CmpltAbrt", /* Bit Position 15 */ | |
567 | "UnxCmplt", /* Bit Position 16 */ | |
568 | "RxOF", /* Bit Position 17 */ | |
569 | "MalfTLP", /* Bit Position 18 */ | |
0319c9a0 | 570 | "ECRC", /* Bit Position 19 */ |
bd237801 TB |
571 | "UnsupReq", /* Bit Position 20 */ |
572 | "ACSViol", /* Bit Position 21 */ | |
573 | "UncorrIntErr", /* Bit Position 22 */ | |
574 | "BlockedTLP", /* Bit Position 23 */ | |
575 | "AtomicOpBlocked", /* Bit Position 24 */ | |
576 | "TLPBlockedErr", /* Bit Position 25 */ | |
0319c9a0 BH |
577 | }; |
578 | ||
579 | static const char *aer_agent_string[] = { | |
580 | "Receiver ID", | |
581 | "Requester ID", | |
582 | "Completer ID", | |
583 | "Transmitter ID" | |
584 | }; | |
585 | ||
81aa5206 RJ |
586 | #define aer_stats_dev_attr(name, stats_array, strings_array, \ |
587 | total_string, total_field) \ | |
588 | static ssize_t \ | |
589 | name##_show(struct device *dev, struct device_attribute *attr, \ | |
590 | char *buf) \ | |
591 | { \ | |
592 | unsigned int i; \ | |
593 | char *str = buf; \ | |
594 | struct pci_dev *pdev = to_pci_dev(dev); \ | |
595 | u64 *stats = pdev->aer_stats->stats_array; \ | |
596 | \ | |
597 | for (i = 0; i < ARRAY_SIZE(strings_array); i++) { \ | |
598 | if (strings_array[i]) \ | |
599 | str += sprintf(str, "%s %llu\n", \ | |
600 | strings_array[i], stats[i]); \ | |
601 | else if (stats[i]) \ | |
602 | str += sprintf(str, #stats_array "_bit[%d] %llu\n",\ | |
603 | i, stats[i]); \ | |
604 | } \ | |
605 | str += sprintf(str, "TOTAL_%s %llu\n", total_string, \ | |
606 | pdev->aer_stats->total_field); \ | |
607 | return str-buf; \ | |
608 | } \ | |
609 | static DEVICE_ATTR_RO(name) | |
610 | ||
611 | aer_stats_dev_attr(aer_dev_correctable, dev_cor_errs, | |
612 | aer_correctable_error_string, "ERR_COR", | |
613 | dev_total_cor_errs); | |
614 | aer_stats_dev_attr(aer_dev_fatal, dev_fatal_errs, | |
615 | aer_uncorrectable_error_string, "ERR_FATAL", | |
616 | dev_total_fatal_errs); | |
617 | aer_stats_dev_attr(aer_dev_nonfatal, dev_nonfatal_errs, | |
618 | aer_uncorrectable_error_string, "ERR_NONFATAL", | |
619 | dev_total_nonfatal_errs); | |
620 | ||
12833017 RJ |
621 | #define aer_stats_rootport_attr(name, field) \ |
622 | static ssize_t \ | |
623 | name##_show(struct device *dev, struct device_attribute *attr, \ | |
624 | char *buf) \ | |
625 | { \ | |
626 | struct pci_dev *pdev = to_pci_dev(dev); \ | |
627 | return sprintf(buf, "%llu\n", pdev->aer_stats->field); \ | |
628 | } \ | |
629 | static DEVICE_ATTR_RO(name) | |
630 | ||
631 | aer_stats_rootport_attr(aer_rootport_total_err_cor, | |
632 | rootport_total_cor_errs); | |
633 | aer_stats_rootport_attr(aer_rootport_total_err_fatal, | |
634 | rootport_total_fatal_errs); | |
635 | aer_stats_rootport_attr(aer_rootport_total_err_nonfatal, | |
636 | rootport_total_nonfatal_errs); | |
637 | ||
81aa5206 RJ |
638 | static struct attribute *aer_stats_attrs[] __ro_after_init = { |
639 | &dev_attr_aer_dev_correctable.attr, | |
640 | &dev_attr_aer_dev_fatal.attr, | |
641 | &dev_attr_aer_dev_nonfatal.attr, | |
12833017 RJ |
642 | &dev_attr_aer_rootport_total_err_cor.attr, |
643 | &dev_attr_aer_rootport_total_err_fatal.attr, | |
644 | &dev_attr_aer_rootport_total_err_nonfatal.attr, | |
81aa5206 RJ |
645 | NULL |
646 | }; | |
647 | ||
648 | static umode_t aer_stats_attrs_are_visible(struct kobject *kobj, | |
649 | struct attribute *a, int n) | |
650 | { | |
651 | struct device *dev = kobj_to_dev(kobj); | |
652 | struct pci_dev *pdev = to_pci_dev(dev); | |
653 | ||
654 | if (!pdev->aer_stats) | |
655 | return 0; | |
656 | ||
12833017 RJ |
657 | if ((a == &dev_attr_aer_rootport_total_err_cor.attr || |
658 | a == &dev_attr_aer_rootport_total_err_fatal.attr || | |
659 | a == &dev_attr_aer_rootport_total_err_nonfatal.attr) && | |
660 | pci_pcie_type(pdev) != PCI_EXP_TYPE_ROOT_PORT) | |
661 | return 0; | |
662 | ||
81aa5206 RJ |
663 | return a->mode; |
664 | } | |
665 | ||
666 | const struct attribute_group aer_stats_attr_group = { | |
667 | .attrs = aer_stats_attrs, | |
668 | .is_visible = aer_stats_attrs_are_visible, | |
669 | }; | |
670 | ||
671 | static void pci_dev_aer_stats_incr(struct pci_dev *pdev, | |
672 | struct aer_err_info *info) | |
673 | { | |
674 | int status, i, max = -1; | |
675 | u64 *counter = NULL; | |
676 | struct aer_stats *aer_stats = pdev->aer_stats; | |
677 | ||
678 | if (!aer_stats) | |
679 | return; | |
680 | ||
681 | switch (info->severity) { | |
682 | case AER_CORRECTABLE: | |
683 | aer_stats->dev_total_cor_errs++; | |
684 | counter = &aer_stats->dev_cor_errs[0]; | |
685 | max = AER_MAX_TYPEOF_COR_ERRS; | |
686 | break; | |
687 | case AER_NONFATAL: | |
688 | aer_stats->dev_total_nonfatal_errs++; | |
689 | counter = &aer_stats->dev_nonfatal_errs[0]; | |
690 | max = AER_MAX_TYPEOF_UNCOR_ERRS; | |
691 | break; | |
692 | case AER_FATAL: | |
693 | aer_stats->dev_total_fatal_errs++; | |
694 | counter = &aer_stats->dev_fatal_errs[0]; | |
695 | max = AER_MAX_TYPEOF_UNCOR_ERRS; | |
696 | break; | |
697 | } | |
698 | ||
699 | status = (info->status & ~info->mask); | |
700 | for (i = 0; i < max; i++) | |
701 | if (status & (1 << i)) | |
702 | counter[i]++; | |
703 | } | |
704 | ||
12833017 RJ |
705 | static void pci_rootport_aer_stats_incr(struct pci_dev *pdev, |
706 | struct aer_err_source *e_src) | |
707 | { | |
708 | struct aer_stats *aer_stats = pdev->aer_stats; | |
709 | ||
710 | if (!aer_stats) | |
711 | return; | |
712 | ||
713 | if (e_src->status & PCI_ERR_ROOT_COR_RCV) | |
714 | aer_stats->rootport_total_cor_errs++; | |
715 | ||
716 | if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) { | |
717 | if (e_src->status & PCI_ERR_ROOT_FATAL_RCV) | |
718 | aer_stats->rootport_total_fatal_errs++; | |
719 | else | |
720 | aer_stats->rootport_total_nonfatal_errs++; | |
721 | } | |
722 | } | |
723 | ||
0319c9a0 BH |
724 | static void __print_tlp_header(struct pci_dev *dev, |
725 | struct aer_header_log_regs *t) | |
726 | { | |
727 | pci_err(dev, " TLP Header: %08x %08x %08x %08x\n", | |
728 | t->dw0, t->dw1, t->dw2, t->dw3); | |
729 | } | |
730 | ||
731 | static void __aer_print_error(struct pci_dev *dev, | |
732 | struct aer_err_info *info) | |
733 | { | |
734 | int i, status; | |
735 | const char *errmsg = NULL; | |
736 | status = (info->status & ~info->mask); | |
737 | ||
738 | for (i = 0; i < 32; i++) { | |
739 | if (!(status & (1 << i))) | |
740 | continue; | |
741 | ||
742 | if (info->severity == AER_CORRECTABLE) | |
743 | errmsg = i < ARRAY_SIZE(aer_correctable_error_string) ? | |
744 | aer_correctable_error_string[i] : NULL; | |
745 | else | |
746 | errmsg = i < ARRAY_SIZE(aer_uncorrectable_error_string) ? | |
747 | aer_uncorrectable_error_string[i] : NULL; | |
748 | ||
749 | if (errmsg) | |
750 | pci_err(dev, " [%2d] %-22s%s\n", i, errmsg, | |
751 | info->first_error == i ? " (First)" : ""); | |
752 | else | |
753 | pci_err(dev, " [%2d] Unknown Error Bit%s\n", | |
754 | i, info->first_error == i ? " (First)" : ""); | |
755 | } | |
81aa5206 | 756 | pci_dev_aer_stats_incr(dev, info); |
0319c9a0 BH |
757 | } |
758 | ||
1e451160 | 759 | void aer_print_error(struct pci_dev *dev, struct aer_err_info *info) |
0319c9a0 BH |
760 | { |
761 | int layer, agent; | |
762 | int id = ((dev->bus->number << 8) | dev->devfn); | |
763 | ||
764 | if (!info->status) { | |
765 | pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, (Unregistered Agent ID)\n", | |
766 | aer_error_severity_string[info->severity]); | |
767 | goto out; | |
768 | } | |
769 | ||
770 | layer = AER_GET_LAYER_ERROR(info->severity, info->status); | |
771 | agent = AER_GET_AGENT(info->severity, info->status); | |
772 | ||
773 | pci_err(dev, "PCIe Bus Error: severity=%s, type=%s, (%s)\n", | |
774 | aer_error_severity_string[info->severity], | |
775 | aer_error_layer[layer], aer_agent_string[agent]); | |
776 | ||
777 | pci_err(dev, " device [%04x:%04x] error status/mask=%08x/%08x\n", | |
778 | dev->vendor, dev->device, | |
779 | info->status, info->mask); | |
780 | ||
781 | __aer_print_error(dev, info); | |
782 | ||
783 | if (info->tlp_header_valid) | |
784 | __print_tlp_header(dev, &info->tlp); | |
785 | ||
786 | out: | |
787 | if (info->id && info->error_dev_num > 1 && info->id == id) | |
788 | pci_err(dev, " Error of this Agent is reported first\n"); | |
789 | ||
790 | trace_aer_event(dev_name(&dev->dev), (info->status & ~info->mask), | |
791 | info->severity, info->tlp_header_valid, &info->tlp); | |
792 | } | |
793 | ||
794 | static void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info) | |
795 | { | |
796 | u8 bus = info->id >> 8; | |
797 | u8 devfn = info->id & 0xff; | |
798 | ||
799 | pci_info(dev, "AER: %s%s error received: %04x:%02x:%02x.%d\n", | |
800 | info->multi_error_valid ? "Multiple " : "", | |
801 | aer_error_severity_string[info->severity], | |
802 | pci_domain_nr(dev->bus), bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); | |
803 | } | |
804 | ||
805 | #ifdef CONFIG_ACPI_APEI_PCIEAER | |
806 | int cper_severity_to_aer(int cper_severity) | |
807 | { | |
808 | switch (cper_severity) { | |
809 | case CPER_SEV_RECOVERABLE: | |
810 | return AER_NONFATAL; | |
811 | case CPER_SEV_FATAL: | |
812 | return AER_FATAL; | |
813 | default: | |
814 | return AER_CORRECTABLE; | |
815 | } | |
816 | } | |
817 | EXPORT_SYMBOL_GPL(cper_severity_to_aer); | |
818 | ||
819 | void cper_print_aer(struct pci_dev *dev, int aer_severity, | |
820 | struct aer_capability_regs *aer) | |
821 | { | |
822 | int layer, agent, tlp_header_valid = 0; | |
823 | u32 status, mask; | |
824 | struct aer_err_info info; | |
825 | ||
826 | if (aer_severity == AER_CORRECTABLE) { | |
827 | status = aer->cor_status; | |
828 | mask = aer->cor_mask; | |
829 | } else { | |
830 | status = aer->uncor_status; | |
831 | mask = aer->uncor_mask; | |
832 | tlp_header_valid = status & AER_LOG_TLP_MASKS; | |
833 | } | |
834 | ||
835 | layer = AER_GET_LAYER_ERROR(aer_severity, status); | |
836 | agent = AER_GET_AGENT(aer_severity, status); | |
837 | ||
838 | memset(&info, 0, sizeof(info)); | |
839 | info.severity = aer_severity; | |
840 | info.status = status; | |
841 | info.mask = mask; | |
842 | info.first_error = PCI_ERR_CAP_FEP(aer->cap_control); | |
843 | ||
844 | pci_err(dev, "aer_status: 0x%08x, aer_mask: 0x%08x\n", status, mask); | |
845 | __aer_print_error(dev, &info); | |
846 | pci_err(dev, "aer_layer=%s, aer_agent=%s\n", | |
847 | aer_error_layer[layer], aer_agent_string[agent]); | |
848 | ||
849 | if (aer_severity != AER_CORRECTABLE) | |
850 | pci_err(dev, "aer_uncor_severity: 0x%08x\n", | |
851 | aer->uncor_severity); | |
852 | ||
853 | if (tlp_header_valid) | |
854 | __print_tlp_header(dev, &aer->header_log); | |
855 | ||
856 | trace_aer_event(dev_name(&dev->dev), (status & ~mask), | |
857 | aer_severity, tlp_header_valid, &aer->header_log); | |
858 | } | |
859 | #endif | |
860 | ||
fd3362cb BH |
861 | /** |
862 | * add_error_device - list device to be handled | |
863 | * @e_info: pointer to error info | |
864 | * @dev: pointer to pci_dev to be added | |
865 | */ | |
866 | static int add_error_device(struct aer_err_info *e_info, struct pci_dev *dev) | |
867 | { | |
868 | if (e_info->error_dev_num < AER_MAX_MULTI_ERR_DEVICES) { | |
60271ab0 | 869 | e_info->dev[e_info->error_dev_num] = pci_dev_get(dev); |
fd3362cb BH |
870 | e_info->error_dev_num++; |
871 | return 0; | |
872 | } | |
873 | return -ENOSPC; | |
874 | } | |
875 | ||
876 | /** | |
877 | * is_error_source - check whether the device is source of reported error | |
878 | * @dev: pointer to pci_dev to be checked | |
879 | * @e_info: pointer to reported error info | |
880 | */ | |
881 | static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info) | |
882 | { | |
883 | int pos; | |
884 | u32 status, mask; | |
885 | u16 reg16; | |
886 | ||
887 | /* | |
888 | * When bus id is equal to 0, it might be a bad id | |
889 | * reported by root port. | |
890 | */ | |
891 | if ((PCI_BUS_NUM(e_info->id) != 0) && | |
892 | !(dev->bus->bus_flags & PCI_BUS_FLAGS_NO_AERSID)) { | |
893 | /* Device ID match? */ | |
894 | if (e_info->id == ((dev->bus->number << 8) | dev->devfn)) | |
895 | return true; | |
896 | ||
897 | /* Continue id comparing if there is no multiple error */ | |
898 | if (!e_info->multi_error_valid) | |
899 | return false; | |
900 | } | |
901 | ||
902 | /* | |
903 | * When either | |
904 | * 1) bus id is equal to 0. Some ports might lose the bus | |
905 | * id of error source id; | |
906 | * 2) bus flag PCI_BUS_FLAGS_NO_AERSID is set | |
907 | * 3) There are multiple errors and prior ID comparing fails; | |
908 | * We check AER status registers to find possible reporter. | |
909 | */ | |
910 | if (atomic_read(&dev->enable_cnt) == 0) | |
911 | return false; | |
912 | ||
913 | /* Check if AER is enabled */ | |
914 | pcie_capability_read_word(dev, PCI_EXP_DEVCTL, ®16); | |
915 | if (!(reg16 & PCI_EXP_AER_FLAGS)) | |
916 | return false; | |
917 | ||
918 | pos = dev->aer_cap; | |
919 | if (!pos) | |
920 | return false; | |
921 | ||
922 | /* Check if error is recorded */ | |
923 | if (e_info->severity == AER_CORRECTABLE) { | |
924 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status); | |
925 | pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask); | |
926 | } else { | |
927 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status); | |
928 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask); | |
929 | } | |
930 | if (status & ~mask) | |
931 | return true; | |
932 | ||
933 | return false; | |
934 | } | |
935 | ||
936 | static int find_device_iter(struct pci_dev *dev, void *data) | |
937 | { | |
938 | struct aer_err_info *e_info = (struct aer_err_info *)data; | |
939 | ||
940 | if (is_error_source(dev, e_info)) { | |
941 | /* List this device */ | |
942 | if (add_error_device(e_info, dev)) { | |
943 | /* We cannot handle more... Stop iteration */ | |
944 | /* TODO: Should print error message here? */ | |
945 | return 1; | |
946 | } | |
947 | ||
948 | /* If there is only a single error, stop iteration */ | |
949 | if (!e_info->multi_error_valid) | |
950 | return 1; | |
951 | } | |
952 | return 0; | |
953 | } | |
954 | ||
955 | /** | |
956 | * find_source_device - search through device hierarchy for source device | |
957 | * @parent: pointer to Root Port pci_dev data structure | |
958 | * @e_info: including detailed error information such like id | |
959 | * | |
960 | * Return true if found. | |
961 | * | |
962 | * Invoked by DPC when error is detected at the Root Port. | |
963 | * Caller of this function must set id, severity, and multi_error_valid of | |
964 | * struct aer_err_info pointed by @e_info properly. This function must fill | |
965 | * e_info->error_dev_num and e_info->dev[], based on the given information. | |
966 | */ | |
967 | static bool find_source_device(struct pci_dev *parent, | |
968 | struct aer_err_info *e_info) | |
969 | { | |
970 | struct pci_dev *dev = parent; | |
971 | int result; | |
972 | ||
973 | /* Must reset in this function */ | |
974 | e_info->error_dev_num = 0; | |
975 | ||
976 | /* Is Root Port an agent that sends error message? */ | |
977 | result = find_device_iter(dev, e_info); | |
978 | if (result) | |
979 | return true; | |
980 | ||
981 | pci_walk_bus(parent->subordinate, find_device_iter, e_info); | |
982 | ||
983 | if (!e_info->error_dev_num) { | |
984 | pci_printk(KERN_DEBUG, parent, "can't find device of ID%04x\n", | |
985 | e_info->id); | |
986 | return false; | |
987 | } | |
988 | return true; | |
989 | } | |
990 | ||
991 | /** | |
992 | * handle_error_source - handle logging error into an event log | |
993 | * @dev: pointer to pci_dev data structure of error source device | |
994 | * @info: comprehensive error information | |
995 | * | |
996 | * Invoked when an error being detected by Root Port. | |
997 | */ | |
998 | static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info) | |
999 | { | |
1000 | int pos; | |
1001 | ||
1002 | if (info->severity == AER_CORRECTABLE) { | |
1003 | /* | |
1004 | * Correctable error does not need software intervention. | |
1005 | * No need to go through error recovery process. | |
1006 | */ | |
1007 | pos = dev->aer_cap; | |
1008 | if (pos) | |
1009 | pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, | |
1010 | info->status); | |
10d790d9 | 1011 | pci_aer_clear_device_status(dev); |
fd3362cb BH |
1012 | } else if (info->severity == AER_NONFATAL) |
1013 | pcie_do_nonfatal_recovery(dev); | |
1014 | else if (info->severity == AER_FATAL) | |
1015 | pcie_do_fatal_recovery(dev, PCIE_PORT_SERVICE_AER); | |
60271ab0 | 1016 | pci_dev_put(dev); |
fd3362cb BH |
1017 | } |
1018 | ||
1019 | #ifdef CONFIG_ACPI_APEI_PCIEAER | |
1020 | ||
1021 | #define AER_RECOVER_RING_ORDER 4 | |
1022 | #define AER_RECOVER_RING_SIZE (1 << AER_RECOVER_RING_ORDER) | |
1023 | ||
1024 | struct aer_recover_entry { | |
1025 | u8 bus; | |
1026 | u8 devfn; | |
1027 | u16 domain; | |
1028 | int severity; | |
1029 | struct aer_capability_regs *regs; | |
1030 | }; | |
1031 | ||
1032 | static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry, | |
1033 | AER_RECOVER_RING_SIZE); | |
1034 | ||
1035 | static void aer_recover_work_func(struct work_struct *work) | |
1036 | { | |
1037 | struct aer_recover_entry entry; | |
1038 | struct pci_dev *pdev; | |
1039 | ||
1040 | while (kfifo_get(&aer_recover_ring, &entry)) { | |
1041 | pdev = pci_get_domain_bus_and_slot(entry.domain, entry.bus, | |
1042 | entry.devfn); | |
1043 | if (!pdev) { | |
1044 | pr_err("AER recover: Can not find pci_dev for %04x:%02x:%02x:%x\n", | |
1045 | entry.domain, entry.bus, | |
1046 | PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn)); | |
1047 | continue; | |
1048 | } | |
1049 | cper_print_aer(pdev, entry.severity, entry.regs); | |
1050 | if (entry.severity == AER_NONFATAL) | |
1051 | pcie_do_nonfatal_recovery(pdev); | |
1052 | else if (entry.severity == AER_FATAL) | |
1053 | pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_AER); | |
1054 | pci_dev_put(pdev); | |
1055 | } | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Mutual exclusion for writers of aer_recover_ring, reader side don't | |
1060 | * need lock, because there is only one reader and lock is not needed | |
1061 | * between reader and writer. | |
1062 | */ | |
1063 | static DEFINE_SPINLOCK(aer_recover_ring_lock); | |
1064 | static DECLARE_WORK(aer_recover_work, aer_recover_work_func); | |
1065 | ||
1066 | void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn, | |
1067 | int severity, struct aer_capability_regs *aer_regs) | |
1068 | { | |
1069 | unsigned long flags; | |
1070 | struct aer_recover_entry entry = { | |
1071 | .bus = bus, | |
1072 | .devfn = devfn, | |
1073 | .domain = domain, | |
1074 | .severity = severity, | |
1075 | .regs = aer_regs, | |
1076 | }; | |
1077 | ||
1078 | spin_lock_irqsave(&aer_recover_ring_lock, flags); | |
1079 | if (kfifo_put(&aer_recover_ring, entry)) | |
1080 | schedule_work(&aer_recover_work); | |
1081 | else | |
1082 | pr_err("AER recover: Buffer overflow when recovering AER for %04x:%02x:%02x:%x\n", | |
1083 | domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); | |
1084 | spin_unlock_irqrestore(&aer_recover_ring_lock, flags); | |
1085 | } | |
1086 | EXPORT_SYMBOL_GPL(aer_recover_queue); | |
1087 | #endif | |
1088 | ||
1089 | /** | |
1e451160 | 1090 | * aer_get_device_error_info - read error status from dev and store it to info |
fd3362cb BH |
1091 | * @dev: pointer to the device expected to have a error record |
1092 | * @info: pointer to structure to store the error record | |
1093 | * | |
1094 | * Return 1 on success, 0 on error. | |
1095 | * | |
1096 | * Note that @info is reused among all error devices. Clear fields properly. | |
1097 | */ | |
1e451160 | 1098 | int aer_get_device_error_info(struct pci_dev *dev, struct aer_err_info *info) |
fd3362cb BH |
1099 | { |
1100 | int pos, temp; | |
1101 | ||
1102 | /* Must reset in this function */ | |
1103 | info->status = 0; | |
1104 | info->tlp_header_valid = 0; | |
1105 | ||
1106 | pos = dev->aer_cap; | |
1107 | ||
1108 | /* The device might not support AER */ | |
1109 | if (!pos) | |
1110 | return 0; | |
1111 | ||
1112 | if (info->severity == AER_CORRECTABLE) { | |
1113 | pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, | |
1114 | &info->status); | |
1115 | pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, | |
1116 | &info->mask); | |
1117 | if (!(info->status & ~info->mask)) | |
1118 | return 0; | |
9d938ea5 KB |
1119 | } else if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT || |
1120 | pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM || | |
1121 | info->severity == AER_NONFATAL) { | |
fd3362cb BH |
1122 | |
1123 | /* Link is still healthy for IO reads */ | |
1124 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, | |
1125 | &info->status); | |
1126 | pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, | |
1127 | &info->mask); | |
1128 | if (!(info->status & ~info->mask)) | |
1129 | return 0; | |
1130 | ||
1131 | /* Get First Error Pointer */ | |
1132 | pci_read_config_dword(dev, pos + PCI_ERR_CAP, &temp); | |
1133 | info->first_error = PCI_ERR_CAP_FEP(temp); | |
1134 | ||
1135 | if (info->status & AER_LOG_TLP_MASKS) { | |
1136 | info->tlp_header_valid = 1; | |
1137 | pci_read_config_dword(dev, | |
1138 | pos + PCI_ERR_HEADER_LOG, &info->tlp.dw0); | |
1139 | pci_read_config_dword(dev, | |
1140 | pos + PCI_ERR_HEADER_LOG + 4, &info->tlp.dw1); | |
1141 | pci_read_config_dword(dev, | |
1142 | pos + PCI_ERR_HEADER_LOG + 8, &info->tlp.dw2); | |
1143 | pci_read_config_dword(dev, | |
1144 | pos + PCI_ERR_HEADER_LOG + 12, &info->tlp.dw3); | |
1145 | } | |
1146 | } | |
1147 | ||
1148 | return 1; | |
1149 | } | |
1150 | ||
1151 | static inline void aer_process_err_devices(struct aer_err_info *e_info) | |
1152 | { | |
1153 | int i; | |
1154 | ||
1155 | /* Report all before handle them, not to lost records by reset etc. */ | |
1156 | for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { | |
1e451160 | 1157 | if (aer_get_device_error_info(e_info->dev[i], e_info)) |
fd3362cb BH |
1158 | aer_print_error(e_info->dev[i], e_info); |
1159 | } | |
1160 | for (i = 0; i < e_info->error_dev_num && e_info->dev[i]; i++) { | |
1e451160 | 1161 | if (aer_get_device_error_info(e_info->dev[i], e_info)) |
fd3362cb BH |
1162 | handle_error_source(e_info->dev[i], e_info); |
1163 | } | |
1164 | } | |
1165 | ||
1166 | /** | |
1167 | * aer_isr_one_error - consume an error detected by root port | |
1168 | * @rpc: pointer to the root port which holds an error | |
1169 | * @e_src: pointer to an error source | |
1170 | */ | |
1171 | static void aer_isr_one_error(struct aer_rpc *rpc, | |
1172 | struct aer_err_source *e_src) | |
1173 | { | |
1174 | struct pci_dev *pdev = rpc->rpd; | |
1175 | struct aer_err_info *e_info = &rpc->e_info; | |
1176 | ||
12833017 RJ |
1177 | pci_rootport_aer_stats_incr(pdev, e_src); |
1178 | ||
fd3362cb BH |
1179 | /* |
1180 | * There is a possibility that both correctable error and | |
1181 | * uncorrectable error being logged. Report correctable error first. | |
1182 | */ | |
1183 | if (e_src->status & PCI_ERR_ROOT_COR_RCV) { | |
1184 | e_info->id = ERR_COR_ID(e_src->id); | |
1185 | e_info->severity = AER_CORRECTABLE; | |
1186 | ||
1187 | if (e_src->status & PCI_ERR_ROOT_MULTI_COR_RCV) | |
1188 | e_info->multi_error_valid = 1; | |
1189 | else | |
1190 | e_info->multi_error_valid = 0; | |
1191 | aer_print_port_info(pdev, e_info); | |
1192 | ||
1193 | if (find_source_device(pdev, e_info)) | |
1194 | aer_process_err_devices(e_info); | |
1195 | } | |
1196 | ||
1197 | if (e_src->status & PCI_ERR_ROOT_UNCOR_RCV) { | |
1198 | e_info->id = ERR_UNCOR_ID(e_src->id); | |
1199 | ||
1200 | if (e_src->status & PCI_ERR_ROOT_FATAL_RCV) | |
1201 | e_info->severity = AER_FATAL; | |
1202 | else | |
1203 | e_info->severity = AER_NONFATAL; | |
1204 | ||
1205 | if (e_src->status & PCI_ERR_ROOT_MULTI_UNCOR_RCV) | |
1206 | e_info->multi_error_valid = 1; | |
1207 | else | |
1208 | e_info->multi_error_valid = 0; | |
1209 | ||
1210 | aer_print_port_info(pdev, e_info); | |
1211 | ||
1212 | if (find_source_device(pdev, e_info)) | |
1213 | aer_process_err_devices(e_info); | |
1214 | } | |
1215 | } | |
1216 | ||
1217 | /** | |
1218 | * get_e_source - retrieve an error source | |
1219 | * @rpc: pointer to the root port which holds an error | |
1220 | * @e_src: pointer to store retrieved error source | |
1221 | * | |
1222 | * Return 1 if an error source is retrieved, otherwise 0. | |
1223 | * | |
1224 | * Invoked by DPC handler to consume an error. | |
1225 | */ | |
1226 | static int get_e_source(struct aer_rpc *rpc, struct aer_err_source *e_src) | |
1227 | { | |
1228 | unsigned long flags; | |
1229 | ||
1230 | /* Lock access to Root error producer/consumer index */ | |
1231 | spin_lock_irqsave(&rpc->e_lock, flags); | |
1232 | if (rpc->prod_idx == rpc->cons_idx) { | |
1233 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | *e_src = rpc->e_sources[rpc->cons_idx]; | |
1238 | rpc->cons_idx++; | |
1239 | if (rpc->cons_idx == AER_ERROR_SOURCES_MAX) | |
1240 | rpc->cons_idx = 0; | |
1241 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
1242 | ||
1243 | return 1; | |
1244 | } | |
1245 | ||
1246 | /** | |
1247 | * aer_isr - consume errors detected by root port | |
1248 | * @work: definition of this work item | |
1249 | * | |
1250 | * Invoked, as DPC, when root port records new detected error | |
1251 | */ | |
1252 | static void aer_isr(struct work_struct *work) | |
1253 | { | |
1254 | struct aer_rpc *rpc = container_of(work, struct aer_rpc, dpc_handler); | |
1255 | struct aer_err_source uninitialized_var(e_src); | |
1256 | ||
1257 | mutex_lock(&rpc->rpc_mutex); | |
1258 | while (get_e_source(rpc, &e_src)) | |
1259 | aer_isr_one_error(rpc, &e_src); | |
1260 | mutex_unlock(&rpc->rpc_mutex); | |
1261 | } | |
1262 | ||
3c43a64c BH |
1263 | /** |
1264 | * aer_irq - Root Port's ISR | |
1265 | * @irq: IRQ assigned to Root Port | |
1266 | * @context: pointer to Root Port data structure | |
1267 | * | |
1268 | * Invoked when Root Port detects AER messages. | |
1269 | */ | |
1270 | irqreturn_t aer_irq(int irq, void *context) | |
1271 | { | |
1272 | unsigned int status, id; | |
1273 | struct pcie_device *pdev = (struct pcie_device *)context; | |
1274 | struct aer_rpc *rpc = get_service_data(pdev); | |
1275 | int next_prod_idx; | |
1276 | unsigned long flags; | |
1277 | int pos; | |
1278 | ||
1279 | pos = pdev->port->aer_cap; | |
1280 | /* | |
1281 | * Must lock access to Root Error Status Reg, Root Error ID Reg, | |
1282 | * and Root error producer/consumer index | |
1283 | */ | |
1284 | spin_lock_irqsave(&rpc->e_lock, flags); | |
1285 | ||
1286 | /* Read error status */ | |
1287 | pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, &status); | |
1288 | if (!(status & (PCI_ERR_ROOT_UNCOR_RCV|PCI_ERR_ROOT_COR_RCV))) { | |
1289 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
1290 | return IRQ_NONE; | |
1291 | } | |
1292 | ||
1293 | /* Read error source and clear error status */ | |
1294 | pci_read_config_dword(pdev->port, pos + PCI_ERR_ROOT_ERR_SRC, &id); | |
1295 | pci_write_config_dword(pdev->port, pos + PCI_ERR_ROOT_STATUS, status); | |
1296 | ||
1297 | /* Store error source for later DPC handler */ | |
1298 | next_prod_idx = rpc->prod_idx + 1; | |
1299 | if (next_prod_idx == AER_ERROR_SOURCES_MAX) | |
1300 | next_prod_idx = 0; | |
1301 | if (next_prod_idx == rpc->cons_idx) { | |
1302 | /* | |
1303 | * Error Storm Condition - possibly the same error occurred. | |
1304 | * Drop the error. | |
1305 | */ | |
1306 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
1307 | return IRQ_HANDLED; | |
1308 | } | |
1309 | rpc->e_sources[rpc->prod_idx].status = status; | |
1310 | rpc->e_sources[rpc->prod_idx].id = id; | |
1311 | rpc->prod_idx = next_prod_idx; | |
1312 | spin_unlock_irqrestore(&rpc->e_lock, flags); | |
1313 | ||
1314 | /* Invoke DPC handler */ | |
1315 | schedule_work(&rpc->dpc_handler); | |
1316 | ||
1317 | return IRQ_HANDLED; | |
1318 | } | |
1319 | EXPORT_SYMBOL_GPL(aer_irq); | |
1320 | ||
843f4697 HS |
1321 | static int set_device_error_reporting(struct pci_dev *dev, void *data) |
1322 | { | |
1323 | bool enable = *((bool *)data); | |
62f87c0e | 1324 | int type = pci_pcie_type(dev); |
843f4697 | 1325 | |
62f87c0e YW |
1326 | if ((type == PCI_EXP_TYPE_ROOT_PORT) || |
1327 | (type == PCI_EXP_TYPE_UPSTREAM) || | |
1328 | (type == PCI_EXP_TYPE_DOWNSTREAM)) { | |
843f4697 HS |
1329 | if (enable) |
1330 | pci_enable_pcie_error_reporting(dev); | |
1331 | else | |
1332 | pci_disable_pcie_error_reporting(dev); | |
1333 | } | |
1334 | ||
1335 | if (enable) | |
1336 | pcie_set_ecrc_checking(dev); | |
1337 | ||
1338 | return 0; | |
1339 | } | |
1340 | ||
1341 | /** | |
1342 | * set_downstream_devices_error_reporting - enable/disable the error reporting bits on the root port and its downstream ports. | |
1343 | * @dev: pointer to root port's pci_dev data structure | |
1344 | * @enable: true = enable error reporting, false = disable error reporting. | |
1345 | */ | |
1346 | static void set_downstream_devices_error_reporting(struct pci_dev *dev, | |
1347 | bool enable) | |
1348 | { | |
1349 | set_device_error_reporting(dev, &enable); | |
1350 | ||
1351 | if (!dev->subordinate) | |
1352 | return; | |
1353 | pci_walk_bus(dev->subordinate, set_device_error_reporting, &enable); | |
1354 | } | |
1355 | ||
1356 | /** | |
1357 | * aer_enable_rootport - enable Root Port's interrupts when receiving messages | |
1358 | * @rpc: pointer to a Root Port data structure | |
1359 | * | |
1360 | * Invoked when PCIe bus loads AER service driver. | |
1361 | */ | |
1362 | static void aer_enable_rootport(struct aer_rpc *rpc) | |
1363 | { | |
e13d17f7 | 1364 | struct pci_dev *pdev = rpc->rpd; |
43bd4ee8 | 1365 | int aer_pos; |
843f4697 HS |
1366 | u16 reg16; |
1367 | u32 reg32; | |
1368 | ||
843f4697 | 1369 | /* Clear PCIe Capability's Device Status */ |
43bd4ee8 JL |
1370 | pcie_capability_read_word(pdev, PCI_EXP_DEVSTA, ®16); |
1371 | pcie_capability_write_word(pdev, PCI_EXP_DEVSTA, reg16); | |
843f4697 HS |
1372 | |
1373 | /* Disable system error generation in response to error messages */ | |
43bd4ee8 JL |
1374 | pcie_capability_clear_word(pdev, PCI_EXP_RTCTL, |
1375 | SYSTEM_ERROR_INTR_ON_MESG_MASK); | |
843f4697 | 1376 | |
66b80809 | 1377 | aer_pos = pdev->aer_cap; |
843f4697 HS |
1378 | /* Clear error status */ |
1379 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, ®32); | |
1380 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_STATUS, reg32); | |
1381 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, ®32); | |
1382 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_COR_STATUS, reg32); | |
1383 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, ®32); | |
1384 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_UNCOR_STATUS, reg32); | |
1385 | ||
1386 | /* | |
1387 | * Enable error reporting for the root port device and downstream port | |
1388 | * devices. | |
1389 | */ | |
1390 | set_downstream_devices_error_reporting(pdev, true); | |
1391 | ||
1392 | /* Enable Root Port's interrupt in response to error messages */ | |
1393 | pci_read_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, ®32); | |
1394 | reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; | |
1395 | pci_write_config_dword(pdev, aer_pos + PCI_ERR_ROOT_COMMAND, reg32); | |
1396 | } | |
1397 | ||
1398 | /** | |
1399 | * aer_disable_rootport - disable Root Port's interrupts when receiving messages | |
1400 | * @rpc: pointer to a Root Port data structure | |
1401 | * | |
1402 | * Invoked when PCIe bus unloads AER service driver. | |
1403 | */ | |
1404 | static void aer_disable_rootport(struct aer_rpc *rpc) | |
1405 | { | |
e13d17f7 | 1406 | struct pci_dev *pdev = rpc->rpd; |
843f4697 HS |
1407 | u32 reg32; |
1408 | int pos; | |
1409 | ||
1410 | /* | |
1411 | * Disable error reporting for the root port device and downstream port | |
1412 | * devices. | |
1413 | */ | |
1414 | set_downstream_devices_error_reporting(pdev, false); | |
1415 | ||
66b80809 | 1416 | pos = pdev->aer_cap; |
843f4697 HS |
1417 | /* Disable Root's interrupt in response to error messages */ |
1418 | pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, ®32); | |
1419 | reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; | |
1420 | pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_COMMAND, reg32); | |
1421 | ||
1422 | /* Clear Root's error status reg */ | |
1423 | pci_read_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, ®32); | |
1424 | pci_write_config_dword(pdev, pos + PCI_ERR_ROOT_STATUS, reg32); | |
1425 | } | |
1426 | ||
6c2b374d ZY |
1427 | /** |
1428 | * aer_alloc_rpc - allocate Root Port data structure | |
1429 | * @dev: pointer to the pcie_dev data structure | |
1430 | * | |
1431 | * Invoked when Root Port's AER service is loaded. | |
f6d37800 | 1432 | */ |
c9a91883 | 1433 | static struct aer_rpc *aer_alloc_rpc(struct pcie_device *dev) |
6c2b374d ZY |
1434 | { |
1435 | struct aer_rpc *rpc; | |
1436 | ||
c9a91883 HS |
1437 | rpc = kzalloc(sizeof(struct aer_rpc), GFP_KERNEL); |
1438 | if (!rpc) | |
6c2b374d ZY |
1439 | return NULL; |
1440 | ||
f6d37800 | 1441 | /* Initialize Root lock access, e_lock, to Root Error Status Reg */ |
f5609d7e | 1442 | spin_lock_init(&rpc->e_lock); |
6c2b374d | 1443 | |
e13d17f7 | 1444 | rpc->rpd = dev->port; |
65f27f38 | 1445 | INIT_WORK(&rpc->dpc_handler, aer_isr); |
6c2b374d | 1446 | mutex_init(&rpc->rpc_mutex); |
6c2b374d | 1447 | |
45e829ea | 1448 | /* Use PCIe bus function to store rpc into PCIe device */ |
6c2b374d ZY |
1449 | set_service_data(dev, rpc); |
1450 | ||
1451 | return rpc; | |
1452 | } | |
1453 | ||
1454 | /** | |
1455 | * aer_remove - clean up resources | |
1456 | * @dev: pointer to the pcie_dev data structure | |
1457 | * | |
1458 | * Invoked when PCI Express bus unloads or AER probe fails. | |
f6d37800 | 1459 | */ |
6c2b374d ZY |
1460 | static void aer_remove(struct pcie_device *dev) |
1461 | { | |
1462 | struct aer_rpc *rpc = get_service_data(dev); | |
1463 | ||
1464 | if (rpc) { | |
1465 | /* If register interrupt service, it must be free. */ | |
1466 | if (rpc->isr) | |
1467 | free_irq(dev->irq, dev); | |
1468 | ||
4ae2182b | 1469 | flush_work(&rpc->dpc_handler); |
460d298d HS |
1470 | aer_disable_rootport(rpc); |
1471 | kfree(rpc); | |
6c2b374d ZY |
1472 | set_service_data(dev, NULL); |
1473 | } | |
1474 | } | |
1475 | ||
1476 | /** | |
1477 | * aer_probe - initialize resources | |
1478 | * @dev: pointer to the pcie_dev data structure | |
6c2b374d ZY |
1479 | * |
1480 | * Invoked when PCI Express bus loads AER service driver. | |
f6d37800 | 1481 | */ |
15856ad5 | 1482 | static int aer_probe(struct pcie_device *dev) |
6c2b374d ZY |
1483 | { |
1484 | int status; | |
1485 | struct aer_rpc *rpc; | |
576700b6 | 1486 | struct device *device = &dev->port->dev; |
6c2b374d | 1487 | |
6c2b374d | 1488 | /* Alloc rpc data structure */ |
c9a91883 HS |
1489 | rpc = aer_alloc_rpc(dev); |
1490 | if (!rpc) { | |
576700b6 | 1491 | dev_printk(KERN_DEBUG, device, "alloc AER rpc failed\n"); |
6c2b374d ZY |
1492 | aer_remove(dev); |
1493 | return -ENOMEM; | |
1494 | } | |
1495 | ||
1496 | /* Request IRQ ISR */ | |
c9a91883 HS |
1497 | status = request_irq(dev->irq, aer_irq, IRQF_SHARED, "aerdrv", dev); |
1498 | if (status) { | |
576700b6 BH |
1499 | dev_printk(KERN_DEBUG, device, "request AER IRQ %d failed\n", |
1500 | dev->irq); | |
6c2b374d ZY |
1501 | aer_remove(dev); |
1502 | return status; | |
1503 | } | |
1504 | ||
1505 | rpc->isr = 1; | |
1506 | ||
1507 | aer_enable_rootport(rpc); | |
68a55ae5 BH |
1508 | dev_info(device, "AER enabled with IRQ %d\n", dev->irq); |
1509 | return 0; | |
6c2b374d ZY |
1510 | } |
1511 | ||
1512 | /** | |
1513 | * aer_root_reset - reset link on Root Port | |
1514 | * @dev: pointer to Root Port's pci_dev data structure | |
1515 | * | |
1516 | * Invoked by Port Bus driver when performing link reset at Root Port. | |
f6d37800 | 1517 | */ |
6c2b374d ZY |
1518 | static pci_ers_result_t aer_root_reset(struct pci_dev *dev) |
1519 | { | |
c6d34edd | 1520 | u32 reg32; |
6c2b374d | 1521 | int pos; |
18426238 | 1522 | int rc; |
6c2b374d | 1523 | |
66b80809 | 1524 | pos = dev->aer_cap; |
6c2b374d ZY |
1525 | |
1526 | /* Disable Root's interrupt in response to error messages */ | |
c6d34edd HS |
1527 | pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, ®32); |
1528 | reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; | |
1529 | pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32); | |
6c2b374d | 1530 | |
381634ca | 1531 | rc = pci_bridge_secondary_bus_reset(dev); |
7506dc79 | 1532 | pci_printk(KERN_DEBUG, dev, "Root Port link has been reset\n"); |
6c2b374d | 1533 | |
c6d34edd HS |
1534 | /* Clear Root Error Status */ |
1535 | pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, ®32); | |
1536 | pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, reg32); | |
1537 | ||
6c2b374d | 1538 | /* Enable Root Port's interrupt in response to error messages */ |
c6d34edd HS |
1539 | pci_read_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, ®32); |
1540 | reg32 |= ROOT_PORT_INTR_ON_MESG_MASK; | |
1541 | pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32); | |
6c2b374d | 1542 | |
18426238 | 1543 | return rc ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED; |
6c2b374d ZY |
1544 | } |
1545 | ||
6c2b374d ZY |
1546 | /** |
1547 | * aer_error_resume - clean up corresponding error status bits | |
1548 | * @dev: pointer to Root Port's pci_dev data structure | |
1549 | * | |
1550 | * Invoked by Port Bus driver during nonfatal recovery. | |
f6d37800 | 1551 | */ |
6c2b374d ZY |
1552 | static void aer_error_resume(struct pci_dev *dev) |
1553 | { | |
ec752f5d | 1554 | pci_aer_clear_device_status(dev); |
5b6c0966 | 1555 | pci_cleanup_aer_uncorrect_error_status(dev); |
6c2b374d ZY |
1556 | } |
1557 | ||
0054ca8e BH |
1558 | static struct pcie_port_service_driver aerdriver = { |
1559 | .name = "aer", | |
1560 | .port_type = PCI_EXP_TYPE_ROOT_PORT, | |
1561 | .service = PCIE_PORT_SERVICE_AER, | |
1562 | ||
1563 | .probe = aer_probe, | |
1564 | .remove = aer_remove, | |
1565 | .error_resume = aer_error_resume, | |
1566 | .reset_link = aer_root_reset, | |
1567 | }; | |
1568 | ||
6c2b374d ZY |
1569 | /** |
1570 | * aer_service_init - register AER root service driver | |
1571 | * | |
1572 | * Invoked when AER root service driver is loaded. | |
f6d37800 | 1573 | */ |
c29de841 | 1574 | int __init pcie_aer_init(void) |
6c2b374d | 1575 | { |
b22c3d82 | 1576 | if (!pci_aer_available() || aer_acpi_firmware_first()) |
3e77a3f7 | 1577 | return -ENXIO; |
c1996c27 | 1578 | return pcie_port_service_register(&aerdriver); |
6c2b374d | 1579 | } |