1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Ampere Computing SoC's SMpro Error Monitoring Driver
4 *
5 * Copyright (c) 2022, Ampere Computing LLC
6 *
7 */
8
9#include <linux/mod_devicetable.h>
10#include <linux/module.h>
11#include <linux/platform_device.h>
12#include <linux/regmap.h>
13
14/* GPI RAS Error Registers */
15#define GPI_RAS_ERR 0x7E
16
17/* Core and L2C Error Registers */
18#define CORE_CE_ERR_CNT 0x80
19#define CORE_CE_ERR_LEN 0x81
20#define CORE_CE_ERR_DATA 0x82
21#define CORE_UE_ERR_CNT 0x83
22#define CORE_UE_ERR_LEN 0x84
23#define CORE_UE_ERR_DATA 0x85
24
25/* Memory Error Registers */
26#define MEM_CE_ERR_CNT 0x90
27#define MEM_CE_ERR_LEN 0x91
28#define MEM_CE_ERR_DATA 0x92
29#define MEM_UE_ERR_CNT 0x93
30#define MEM_UE_ERR_LEN 0x94
31#define MEM_UE_ERR_DATA 0x95
32
33/* RAS Error/Warning Registers */
34#define ERR_SMPRO_TYPE 0xA0
35#define ERR_PMPRO_TYPE 0xA1
36#define ERR_SMPRO_INFO_LO 0xA2
37#define ERR_SMPRO_INFO_HI 0xA3
38#define ERR_SMPRO_DATA_LO 0xA4
39#define ERR_SMPRO_DATA_HI 0xA5
40#define WARN_SMPRO_INFO_LO 0xAA
41#define WARN_SMPRO_INFO_HI 0xAB
42#define ERR_PMPRO_INFO_LO 0xA6
43#define ERR_PMPRO_INFO_HI 0xA7
44#define ERR_PMPRO_DATA_LO 0xA8
45#define ERR_PMPRO_DATA_HI 0xA9
46#define WARN_PMPRO_INFO_LO 0xAC
47#define WARN_PMPRO_INFO_HI 0xAD
48
49/* Boot Stage Register */
50#define BOOTSTAGE 0xB0
51#define DIMM_SYNDROME_SEL 0xB4
52#define DIMM_SYNDROME_ERR 0xB5
53#define DIMM_SYNDROME_STAGE 4
54
55/* PCIE Error Registers */
56#define PCIE_CE_ERR_CNT 0xC0
57#define PCIE_CE_ERR_LEN 0xC1
58#define PCIE_CE_ERR_DATA 0xC2
59#define PCIE_UE_ERR_CNT 0xC3
60#define PCIE_UE_ERR_LEN 0xC4
61#define PCIE_UE_ERR_DATA 0xC5
62
63/* Other Error Registers */
64#define OTHER_CE_ERR_CNT 0xD0
65#define OTHER_CE_ERR_LEN 0xD1
66#define OTHER_CE_ERR_DATA 0xD2
67#define OTHER_UE_ERR_CNT 0xD8
68#define OTHER_UE_ERR_LEN 0xD9
69#define OTHER_UE_ERR_DATA 0xDA
70
71/* Event Data Registers */
72#define VRD_WARN_FAULT_EVENT_DATA 0x78
73#define VRD_HOT_EVENT_DATA 0x79
74#define DIMM_HOT_EVENT_DATA 0x7A
75#define DIMM_2X_REFRESH_EVENT_DATA 0x96
76
77#define MAX_READ_BLOCK_LENGTH 48
78
79#define RAS_SMPRO_ERR 0
80#define RAS_PMPRO_ERR 1
81
82enum RAS_48BYTES_ERR_TYPES {
83 CORE_CE_ERR,
84 CORE_UE_ERR,
85 MEM_CE_ERR,
86 MEM_UE_ERR,
87 PCIE_CE_ERR,
88 PCIE_UE_ERR,
89 OTHER_CE_ERR,
90 OTHER_UE_ERR,
91 NUM_48BYTES_ERR_TYPE,
92};
93
94struct smpro_error_hdr {
95 u8 count; /* Number of the RAS errors */
96 u8 len; /* Number of data bytes */
97 u8 data; /* Start of 48-byte data */
98 u8 max_cnt; /* Max num of errors */
99};
100
101/*
102 * Included Address of registers to get Count, Length of data and Data
103 * of the 48 bytes error data
104 */
105static struct smpro_error_hdr smpro_error_table[] = {
106 [CORE_CE_ERR] = {
107 .count = CORE_CE_ERR_CNT,
108 .len = CORE_CE_ERR_LEN,
109 .data = CORE_CE_ERR_DATA,
110 .max_cnt = 32
111 },
112 [CORE_UE_ERR] = {
113 .count = CORE_UE_ERR_CNT,
114 .len = CORE_UE_ERR_LEN,
115 .data = CORE_UE_ERR_DATA,
116 .max_cnt = 32
117 },
118 [MEM_CE_ERR] = {
119 .count = MEM_CE_ERR_CNT,
120 .len = MEM_CE_ERR_LEN,
121 .data = MEM_CE_ERR_DATA,
122 .max_cnt = 16
123 },
124 [MEM_UE_ERR] = {
125 .count = MEM_UE_ERR_CNT,
126 .len = MEM_UE_ERR_LEN,
127 .data = MEM_UE_ERR_DATA,
128 .max_cnt = 16
129 },
130 [PCIE_CE_ERR] = {
131 .count = PCIE_CE_ERR_CNT,
132 .len = PCIE_CE_ERR_LEN,
133 .data = PCIE_CE_ERR_DATA,
134 .max_cnt = 96
135 },
136 [PCIE_UE_ERR] = {
137 .count = PCIE_UE_ERR_CNT,
138 .len = PCIE_UE_ERR_LEN,
139 .data = PCIE_UE_ERR_DATA,
140 .max_cnt = 96
141 },
142 [OTHER_CE_ERR] = {
143 .count = OTHER_CE_ERR_CNT,
144 .len = OTHER_CE_ERR_LEN,
145 .data = OTHER_CE_ERR_DATA,
146 .max_cnt = 8
147 },
148 [OTHER_UE_ERR] = {
149 .count = OTHER_UE_ERR_CNT,
150 .len = OTHER_UE_ERR_LEN,
151 .data = OTHER_UE_ERR_DATA,
152 .max_cnt = 8
153 },
154};
155
156/*
157 * List of SCP registers which are used to get
158 * one type of RAS Internal errors.
159 */
160struct smpro_int_error_hdr {
161 u8 type;
162 u8 info_l;
163 u8 info_h;
164 u8 data_l;
165 u8 data_h;
166 u8 warn_l;
167 u8 warn_h;
168};
169
170static struct smpro_int_error_hdr list_smpro_int_error_hdr[] = {
171 [RAS_SMPRO_ERR] = {
172 .type = ERR_SMPRO_TYPE,
173 .info_l = ERR_SMPRO_INFO_LO,
174 .info_h = ERR_SMPRO_INFO_HI,
175 .data_l = ERR_SMPRO_DATA_LO,
176 .data_h = ERR_SMPRO_DATA_HI,
177 .warn_l = WARN_SMPRO_INFO_LO,
178 .warn_h = WARN_SMPRO_INFO_HI,
179 },
180 [RAS_PMPRO_ERR] = {
181 .type = ERR_PMPRO_TYPE,
182 .info_l = ERR_PMPRO_INFO_LO,
183 .info_h = ERR_PMPRO_INFO_HI,
184 .data_l = ERR_PMPRO_DATA_LO,
185 .data_h = ERR_PMPRO_DATA_HI,
186 .warn_l = WARN_PMPRO_INFO_LO,
187 .warn_h = WARN_PMPRO_INFO_HI,
188 },
189};
190
191struct smpro_errmon {
192 struct regmap *regmap;
193};
194
195enum EVENT_TYPES {
196 VRD_WARN_FAULT_EVENT,
197 VRD_HOT_EVENT,
198 DIMM_HOT_EVENT,
199 DIMM_2X_REFRESH_EVENT,
200 NUM_EVENTS_TYPE,
201};
202
203/* Included Address of event source and data registers */
204static u8 smpro_event_table[NUM_EVENTS_TYPE] = {
205 VRD_WARN_FAULT_EVENT_DATA,
206 VRD_HOT_EVENT_DATA,
207 DIMM_HOT_EVENT_DATA,
208 DIMM_2X_REFRESH_EVENT_DATA,
209};
210
211static ssize_t smpro_event_data_read(struct device *dev,
212 struct device_attribute *da, char *buf,
213 int channel)
214{
215 struct smpro_errmon *errmon = dev_get_drvdata(dev);
216 s32 event_data;
217 int ret;
218
219 ret = regmap_read(map: errmon->regmap, reg: smpro_event_table[channel], val: &event_data);
220 if (ret)
221 return ret;
222 /* Clear event after read */
223 if (event_data != 0)
224 regmap_write(map: errmon->regmap, reg: smpro_event_table[channel], val: event_data);
225
226 return sysfs_emit(buf, fmt: "%04x\n", event_data);
227}
228
229static ssize_t smpro_overflow_data_read(struct device *dev, struct device_attribute *da,
230 char *buf, int channel)
231{
232 struct smpro_errmon *errmon = dev_get_drvdata(dev);
233 struct smpro_error_hdr *err_info;
234 s32 err_count;
235 int ret;
236
237 err_info = &smpro_error_table[channel];
238
239 ret = regmap_read(map: errmon->regmap, reg: err_info->count, val: &err_count);
240 if (ret)
241 return ret;
242
243 /* Bit 8 indicates the overflow status */
244 return sysfs_emit(buf, fmt: "%d\n", (err_count & BIT(8)) ? 1 : 0);
245}
246
247static ssize_t smpro_error_data_read(struct device *dev, struct device_attribute *da,
248 char *buf, int channel)
249{
250 struct smpro_errmon *errmon = dev_get_drvdata(dev);
251 unsigned char err_data[MAX_READ_BLOCK_LENGTH];
252 struct smpro_error_hdr *err_info;
253 s32 err_count, err_length;
254 int ret;
255
256 err_info = &smpro_error_table[channel];
257
258 ret = regmap_read(map: errmon->regmap, reg: err_info->count, val: &err_count);
259 /* Error count is the low byte */
260 err_count &= 0xff;
261 if (ret || !err_count || err_count > err_info->max_cnt)
262 return ret;
263
264 ret = regmap_read(map: errmon->regmap, reg: err_info->len, val: &err_length);
265 if (ret || err_length <= 0)
266 return ret;
267
268 if (err_length > MAX_READ_BLOCK_LENGTH)
269 err_length = MAX_READ_BLOCK_LENGTH;
270
271 memset(err_data, 0x00, MAX_READ_BLOCK_LENGTH);
272 ret = regmap_noinc_read(map: errmon->regmap, reg: err_info->data, val: err_data, val_len: err_length);
273 if (ret < 0)
274 return ret;
275
276 /* clear the error */
277 ret = regmap_write(map: errmon->regmap, reg: err_info->count, val: 0x100);
278 if (ret)
279 return ret;
280 /*
281 * The output of Core/Memory/PCIe/Others UE/CE errors follows the format
282 * specified in section 5.8.1 CE/UE Error Data record in
283 * Altra SOC BMC Interface specification.
284 */
285 return sysfs_emit(buf, fmt: "%*phN\n", MAX_READ_BLOCK_LENGTH, err_data);
286}
287
288/*
289 * Output format:
290 * <4-byte hex value of error info><4-byte hex value of error extensive data>
291 * Where:
292 * + error info : The error information
293 * + error data : Extensive data (32 bits)
294 * Reference to section 5.10 RAS Internal Error Register Definition in
295 * Altra SOC BMC Interface specification
296 */
297static ssize_t smpro_internal_err_read(struct device *dev, struct device_attribute *da,
298 char *buf, int channel)
299{
300 struct smpro_errmon *errmon = dev_get_drvdata(dev);
301 struct smpro_int_error_hdr *err_info;
302 unsigned int err[4] = { 0 };
303 unsigned int err_type;
304 unsigned int val;
305 int ret;
306
307 /* read error status */
308 ret = regmap_read(map: errmon->regmap, GPI_RAS_ERR, val: &val);
309 if (ret)
310 return ret;
311
312 if ((channel == RAS_SMPRO_ERR && !(val & BIT(0))) ||
313 (channel == RAS_PMPRO_ERR && !(val & BIT(1))))
314 return 0;
315
316 err_info = &list_smpro_int_error_hdr[channel];
317 ret = regmap_read(map: errmon->regmap, reg: err_info->type, val: &val);
318 if (ret)
319 return ret;
320
321 err_type = (val & BIT(1)) ? BIT(1) :
322 (val & BIT(2)) ? BIT(2) : 0;
323
324 if (!err_type)
325 return 0;
326
327 ret = regmap_read(map: errmon->regmap, reg: err_info->info_l, val: err + 1);
328 if (ret)
329 return ret;
330
331 ret = regmap_read(map: errmon->regmap, reg: err_info->info_h, val: err);
332 if (ret)
333 return ret;
334
335 if (err_type & BIT(2)) {
336 /* Error with data type */
337 ret = regmap_read(map: errmon->regmap, reg: err_info->data_l, val: err + 3);
338 if (ret)
339 return ret;
340
341 ret = regmap_read(map: errmon->regmap, reg: err_info->data_h, val: err + 2);
342 if (ret)
343 return ret;
344 }
345
346 /* clear the read errors */
347 ret = regmap_write(map: errmon->regmap, reg: err_info->type, val: err_type);
348 if (ret)
349 return ret;
350
351 return sysfs_emit(buf, fmt: "%*phN\n", (int)sizeof(err), err);
352}
353
354/*
355 * Output format:
356 * <4-byte hex value of warining info>
357 * Reference to section 5.10 RAS Internal Error Register Definition in
358 * Altra SOC BMC Interface specification
359 */
360static ssize_t smpro_internal_warn_read(struct device *dev, struct device_attribute *da,
361 char *buf, int channel)
362{
363 struct smpro_errmon *errmon = dev_get_drvdata(dev);
364 struct smpro_int_error_hdr *err_info;
365 unsigned int warn[2] = { 0 };
366 unsigned int val;
367 int ret;
368
369 /* read error status */
370 ret = regmap_read(map: errmon->regmap, GPI_RAS_ERR, val: &val);
371 if (ret)
372 return ret;
373
374 if ((channel == RAS_SMPRO_ERR && !(val & BIT(0))) ||
375 (channel == RAS_PMPRO_ERR && !(val & BIT(1))))
376 return 0;
377
378 err_info = &list_smpro_int_error_hdr[channel];
379 ret = regmap_read(map: errmon->regmap, reg: err_info->type, val: &val);
380 if (ret)
381 return ret;
382
383 if (!(val & BIT(0)))
384 return 0;
385
386 ret = regmap_read(map: errmon->regmap, reg: err_info->warn_l, val: warn + 1);
387 if (ret)
388 return ret;
389
390 ret = regmap_read(map: errmon->regmap, reg: err_info->warn_h, val: warn);
391 if (ret)
392 return ret;
393
394 /* clear the warning */
395 ret = regmap_write(map: errmon->regmap, reg: err_info->type, BIT(0));
396 if (ret)
397 return ret;
398
399 return sysfs_emit(buf, fmt: "%*phN\n", (int)sizeof(warn), warn);
400}
401
402#define ERROR_OVERFLOW_RO(_error, _index) \
403 static ssize_t overflow_##_error##_show(struct device *dev, \
404 struct device_attribute *da, \
405 char *buf) \
406 { \
407 return smpro_overflow_data_read(dev, da, buf, _index); \
408 } \
409 static DEVICE_ATTR_RO(overflow_##_error)
410
411ERROR_OVERFLOW_RO(core_ce, CORE_CE_ERR);
412ERROR_OVERFLOW_RO(core_ue, CORE_UE_ERR);
413ERROR_OVERFLOW_RO(mem_ce, MEM_CE_ERR);
414ERROR_OVERFLOW_RO(mem_ue, MEM_UE_ERR);
415ERROR_OVERFLOW_RO(pcie_ce, PCIE_CE_ERR);
416ERROR_OVERFLOW_RO(pcie_ue, PCIE_UE_ERR);
417ERROR_OVERFLOW_RO(other_ce, OTHER_CE_ERR);
418ERROR_OVERFLOW_RO(other_ue, OTHER_UE_ERR);
419
420#define ERROR_RO(_error, _index) \
421 static ssize_t error_##_error##_show(struct device *dev, \
422 struct device_attribute *da, \
423 char *buf) \
424 { \
425 return smpro_error_data_read(dev, da, buf, _index); \
426 } \
427 static DEVICE_ATTR_RO(error_##_error)
428
429ERROR_RO(core_ce, CORE_CE_ERR);
430ERROR_RO(core_ue, CORE_UE_ERR);
431ERROR_RO(mem_ce, MEM_CE_ERR);
432ERROR_RO(mem_ue, MEM_UE_ERR);
433ERROR_RO(pcie_ce, PCIE_CE_ERR);
434ERROR_RO(pcie_ue, PCIE_UE_ERR);
435ERROR_RO(other_ce, OTHER_CE_ERR);
436ERROR_RO(other_ue, OTHER_UE_ERR);
437
438static ssize_t error_smpro_show(struct device *dev, struct device_attribute *da, char *buf)
439{
440 return smpro_internal_err_read(dev, da, buf, RAS_SMPRO_ERR);
441}
442static DEVICE_ATTR_RO(error_smpro);
443
444static ssize_t error_pmpro_show(struct device *dev, struct device_attribute *da, char *buf)
445{
446 return smpro_internal_err_read(dev, da, buf, RAS_PMPRO_ERR);
447}
448static DEVICE_ATTR_RO(error_pmpro);
449
450static ssize_t warn_smpro_show(struct device *dev, struct device_attribute *da, char *buf)
451{
452 return smpro_internal_warn_read(dev, da, buf, RAS_SMPRO_ERR);
453}
454static DEVICE_ATTR_RO(warn_smpro);
455
456static ssize_t warn_pmpro_show(struct device *dev, struct device_attribute *da, char *buf)
457{
458 return smpro_internal_warn_read(dev, da, buf, RAS_PMPRO_ERR);
459}
460static DEVICE_ATTR_RO(warn_pmpro);
461
462#define EVENT_RO(_event, _index) \
463 static ssize_t event_##_event##_show(struct device *dev, \
464 struct device_attribute *da, \
465 char *buf) \
466 { \
467 return smpro_event_data_read(dev, da, buf, _index); \
468 } \
469 static DEVICE_ATTR_RO(event_##_event)
470
471EVENT_RO(vrd_warn_fault, VRD_WARN_FAULT_EVENT);
472EVENT_RO(vrd_hot, VRD_HOT_EVENT);
473EVENT_RO(dimm_hot, DIMM_HOT_EVENT);
474EVENT_RO(dimm_2x_refresh, DIMM_2X_REFRESH_EVENT);
475
476static ssize_t smpro_dimm_syndrome_read(struct device *dev, struct device_attribute *da,
477 char *buf, unsigned int slot)
478{
479 struct smpro_errmon *errmon = dev_get_drvdata(dev);
480 unsigned int data;
481 int ret;
482
483 ret = regmap_read(map: errmon->regmap, BOOTSTAGE, val: &data);
484 if (ret)
485 return ret;
486
487 /* check for valid stage */
488 data = (data >> 8) & 0xff;
489 if (data != DIMM_SYNDROME_STAGE)
490 return ret;
491
492 /* Write the slot ID to retrieve Error Syndrome */
493 ret = regmap_write(map: errmon->regmap, DIMM_SYNDROME_SEL, val: slot);
494 if (ret)
495 return ret;
496
497 /* Read the Syndrome error */
498 ret = regmap_read(map: errmon->regmap, DIMM_SYNDROME_ERR, val: &data);
499 if (ret || !data)
500 return ret;
501
502 return sysfs_emit(buf, fmt: "%04x\n", data);
503}
504
505#define EVENT_DIMM_SYNDROME(_slot) \
506 static ssize_t event_dimm##_slot##_syndrome_show(struct device *dev, \
507 struct device_attribute *da, \
508 char *buf) \
509 { \
510 return smpro_dimm_syndrome_read(dev, da, buf, _slot); \
511 } \
512 static DEVICE_ATTR_RO(event_dimm##_slot##_syndrome)
513
514EVENT_DIMM_SYNDROME(0);
515EVENT_DIMM_SYNDROME(1);
516EVENT_DIMM_SYNDROME(2);
517EVENT_DIMM_SYNDROME(3);
518EVENT_DIMM_SYNDROME(4);
519EVENT_DIMM_SYNDROME(5);
520EVENT_DIMM_SYNDROME(6);
521EVENT_DIMM_SYNDROME(7);
522EVENT_DIMM_SYNDROME(8);
523EVENT_DIMM_SYNDROME(9);
524EVENT_DIMM_SYNDROME(10);
525EVENT_DIMM_SYNDROME(11);
526EVENT_DIMM_SYNDROME(12);
527EVENT_DIMM_SYNDROME(13);
528EVENT_DIMM_SYNDROME(14);
529EVENT_DIMM_SYNDROME(15);
530
531static struct attribute *smpro_errmon_attrs[] = {
532 &dev_attr_overflow_core_ce.attr,
533 &dev_attr_overflow_core_ue.attr,
534 &dev_attr_overflow_mem_ce.attr,
535 &dev_attr_overflow_mem_ue.attr,
536 &dev_attr_overflow_pcie_ce.attr,
537 &dev_attr_overflow_pcie_ue.attr,
538 &dev_attr_overflow_other_ce.attr,
539 &dev_attr_overflow_other_ue.attr,
540 &dev_attr_error_core_ce.attr,
541 &dev_attr_error_core_ue.attr,
542 &dev_attr_error_mem_ce.attr,
543 &dev_attr_error_mem_ue.attr,
544 &dev_attr_error_pcie_ce.attr,
545 &dev_attr_error_pcie_ue.attr,
546 &dev_attr_error_other_ce.attr,
547 &dev_attr_error_other_ue.attr,
548 &dev_attr_error_smpro.attr,
549 &dev_attr_error_pmpro.attr,
550 &dev_attr_warn_smpro.attr,
551 &dev_attr_warn_pmpro.attr,
552 &dev_attr_event_vrd_warn_fault.attr,
553 &dev_attr_event_vrd_hot.attr,
554 &dev_attr_event_dimm_hot.attr,
555 &dev_attr_event_dimm_2x_refresh.attr,
556 &dev_attr_event_dimm0_syndrome.attr,
557 &dev_attr_event_dimm1_syndrome.attr,
558 &dev_attr_event_dimm2_syndrome.attr,
559 &dev_attr_event_dimm3_syndrome.attr,
560 &dev_attr_event_dimm4_syndrome.attr,
561 &dev_attr_event_dimm5_syndrome.attr,
562 &dev_attr_event_dimm6_syndrome.attr,
563 &dev_attr_event_dimm7_syndrome.attr,
564 &dev_attr_event_dimm8_syndrome.attr,
565 &dev_attr_event_dimm9_syndrome.attr,
566 &dev_attr_event_dimm10_syndrome.attr,
567 &dev_attr_event_dimm11_syndrome.attr,
568 &dev_attr_event_dimm12_syndrome.attr,
569 &dev_attr_event_dimm13_syndrome.attr,
570 &dev_attr_event_dimm14_syndrome.attr,
571 &dev_attr_event_dimm15_syndrome.attr,
572 NULL
573};
574
575ATTRIBUTE_GROUPS(smpro_errmon);
576
577static int smpro_errmon_probe(struct platform_device *pdev)
578{
579 struct smpro_errmon *errmon;
580
581 errmon = devm_kzalloc(dev: &pdev->dev, size: sizeof(struct smpro_errmon), GFP_KERNEL);
582 if (!errmon)
583 return -ENOMEM;
584
585 platform_set_drvdata(pdev, data: errmon);
586
587 errmon->regmap = dev_get_regmap(dev: pdev->dev.parent, NULL);
588 if (!errmon->regmap)
589 return -ENODEV;
590
591 return 0;
592}
593
594static struct platform_driver smpro_errmon_driver = {
595 .probe = smpro_errmon_probe,
596 .driver = {
597 .name = "smpro-errmon",
598 .dev_groups = smpro_errmon_groups,
599 },
600};
601
602module_platform_driver(smpro_errmon_driver);
603
604MODULE_AUTHOR("Tung Nguyen <tung.nguyen@amperecomputing.com>");
605MODULE_AUTHOR("Thinh Pham <thinh.pham@amperecomputing.com>");
606MODULE_AUTHOR("Hoang Nguyen <hnguyen@amperecomputing.com>");
607MODULE_AUTHOR("Thu Nguyen <thu@os.amperecomputing.com>");
608MODULE_AUTHOR("Quan Nguyen <quan@os.amperecomputing.com>");
609MODULE_DESCRIPTION("Ampere Altra SMpro driver");
610MODULE_LICENSE("GPL");
611

source code of linux/drivers/misc/smpro-errmon.c