1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * (c) 2005-2016 Advanced Micro Devices, Inc.
4 *
5 * Written by Jacob Shin - AMD, Inc.
6 * Maintained by: Borislav Petkov <bp@alien8.de>
7 *
8 * All MC4_MISCi registers are shared between cores on a node.
9 */
10 #include <linux/interrupt.h>
11 #include <linux/notifier.h>
12 #include <linux/kobject.h>
13 #include <linux/percpu.h>
14 #include <linux/errno.h>
15 #include <linux/sched.h>
16 #include <linux/sysfs.h>
17 #include <linux/slab.h>
18 #include <linux/init.h>
19 #include <linux/cpu.h>
20 #include <linux/smp.h>
21 #include <linux/string.h>
22
23 #include <asm/amd_nb.h>
24 #include <asm/traps.h>
25 #include <asm/apic.h>
26 #include <asm/mce.h>
27 #include <asm/msr.h>
28 #include <asm/trace/irq_vectors.h>
29
30 #include "internal.h"
31
32 #define NR_BLOCKS 5
33 #define THRESHOLD_MAX 0xFFF
34 #define INT_TYPE_APIC 0x00020000
35 #define MASK_VALID_HI 0x80000000
36 #define MASK_CNTP_HI 0x40000000
37 #define MASK_LOCKED_HI 0x20000000
38 #define MASK_LVTOFF_HI 0x00F00000
39 #define MASK_COUNT_EN_HI 0x00080000
40 #define MASK_INT_TYPE_HI 0x00060000
41 #define MASK_OVERFLOW_HI 0x00010000
42 #define MASK_ERR_COUNT_HI 0x00000FFF
43 #define MASK_BLKPTR_LO 0xFF000000
44 #define MCG_XBLK_ADDR 0xC0000400
45
46 /* Deferred error settings */
47 #define MSR_CU_DEF_ERR 0xC0000410
48 #define MASK_DEF_LVTOFF 0x000000F0
49 #define MASK_DEF_INT_TYPE 0x00000006
50 #define DEF_LVT_OFF 0x2
51 #define DEF_INT_TYPE_APIC 0x2
52
53 /* Scalable MCA: */
54
55 /* Threshold LVT offset is at MSR0xC0000410[15:12] */
56 #define SMCA_THR_LVT_OFF 0xF000
57
58 static bool thresholding_irq_en;
59
60 static const char * const th_names[] = {
61 "load_store",
62 "insn_fetch",
63 "combined_unit",
64 "decode_unit",
65 "northbridge",
66 "execution_unit",
67 };
68
69 static const char * const smca_umc_block_names[] = {
70 "dram_ecc",
71 "misc_umc"
72 };
73
74 #define HWID_MCATYPE(hwid, mcatype) (((hwid) << 16) | (mcatype))
75
76 struct smca_hwid {
77 unsigned int bank_type; /* Use with smca_bank_types for easy indexing. */
78 u32 hwid_mcatype; /* (hwid,mcatype) tuple */
79 };
80
81 struct smca_bank {
82 const struct smca_hwid *hwid;
83 u32 id; /* Value of MCA_IPID[InstanceId]. */
84 u8 sysfs_id; /* Value used for sysfs name. */
85 };
86
87 static DEFINE_PER_CPU_READ_MOSTLY(struct smca_bank[MAX_NR_BANKS], smca_banks);
88 static DEFINE_PER_CPU_READ_MOSTLY(u8[N_SMCA_BANK_TYPES], smca_bank_counts);
89
90 static const char * const smca_names[] = {
91 [SMCA_LS ... SMCA_LS_V2] = "load_store",
92 [SMCA_IF] = "insn_fetch",
93 [SMCA_L2_CACHE] = "l2_cache",
94 [SMCA_DE] = "decode_unit",
95 [SMCA_RESERVED] = "reserved",
96 [SMCA_EX] = "execution_unit",
97 [SMCA_FP] = "floating_point",
98 [SMCA_L3_CACHE] = "l3_cache",
99 [SMCA_CS ... SMCA_CS_V2] = "coherent_slave",
100 [SMCA_PIE] = "pie",
101
102 /* UMC v2 is separate because both of them can exist in a single system. */
103 [SMCA_UMC] = "umc",
104 [SMCA_UMC_V2] = "umc_v2",
105 [SMCA_MA_LLC] = "ma_llc",
106 [SMCA_PB] = "param_block",
107 [SMCA_PSP ... SMCA_PSP_V2] = "psp",
108 [SMCA_SMU ... SMCA_SMU_V2] = "smu",
109 [SMCA_MP5] = "mp5",
110 [SMCA_MPDMA] = "mpdma",
111 [SMCA_NBIO] = "nbio",
112 [SMCA_PCIE ... SMCA_PCIE_V2] = "pcie",
113 [SMCA_XGMI_PCS] = "xgmi_pcs",
114 [SMCA_NBIF] = "nbif",
115 [SMCA_SHUB] = "shub",
116 [SMCA_SATA] = "sata",
117 [SMCA_USB] = "usb",
118 [SMCA_USR_DP] = "usr_dp",
119 [SMCA_USR_CP] = "usr_cp",
120 [SMCA_GMI_PCS] = "gmi_pcs",
121 [SMCA_XGMI_PHY] = "xgmi_phy",
122 [SMCA_WAFL_PHY] = "wafl_phy",
123 [SMCA_GMI_PHY] = "gmi_phy",
124 };
125
smca_get_name(enum smca_bank_types t)126 static const char *smca_get_name(enum smca_bank_types t)
127 {
128 if (t >= N_SMCA_BANK_TYPES)
129 return NULL;
130
131 return smca_names[t];
132 }
133
smca_get_bank_type(unsigned int cpu,unsigned int bank)134 enum smca_bank_types smca_get_bank_type(unsigned int cpu, unsigned int bank)
135 {
136 struct smca_bank *b;
137
138 if (bank >= MAX_NR_BANKS)
139 return N_SMCA_BANK_TYPES;
140
141 b = &per_cpu(smca_banks, cpu)[bank];
142 if (!b->hwid)
143 return N_SMCA_BANK_TYPES;
144
145 return b->hwid->bank_type;
146 }
147 EXPORT_SYMBOL_GPL(smca_get_bank_type);
148
149 static const struct smca_hwid smca_hwid_mcatypes[] = {
150 /* { bank_type, hwid_mcatype } */
151
152 /* Reserved type */
153 { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0) },
154
155 /* ZN Core (HWID=0xB0) MCA types */
156 { SMCA_LS, HWID_MCATYPE(0xB0, 0x0) },
157 { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10) },
158 { SMCA_IF, HWID_MCATYPE(0xB0, 0x1) },
159 { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2) },
160 { SMCA_DE, HWID_MCATYPE(0xB0, 0x3) },
161 /* HWID 0xB0 MCATYPE 0x4 is Reserved */
162 { SMCA_EX, HWID_MCATYPE(0xB0, 0x5) },
163 { SMCA_FP, HWID_MCATYPE(0xB0, 0x6) },
164 { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7) },
165
166 /* Data Fabric MCA types */
167 { SMCA_CS, HWID_MCATYPE(0x2E, 0x0) },
168 { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1) },
169 { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2) },
170 { SMCA_MA_LLC, HWID_MCATYPE(0x2E, 0x4) },
171
172 /* Unified Memory Controller MCA type */
173 { SMCA_UMC, HWID_MCATYPE(0x96, 0x0) },
174 { SMCA_UMC_V2, HWID_MCATYPE(0x96, 0x1) },
175
176 /* Parameter Block MCA type */
177 { SMCA_PB, HWID_MCATYPE(0x05, 0x0) },
178
179 /* Platform Security Processor MCA type */
180 { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0) },
181 { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1) },
182
183 /* System Management Unit MCA type */
184 { SMCA_SMU, HWID_MCATYPE(0x01, 0x0) },
185 { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1) },
186
187 /* Microprocessor 5 Unit MCA type */
188 { SMCA_MP5, HWID_MCATYPE(0x01, 0x2) },
189
190 /* MPDMA MCA type */
191 { SMCA_MPDMA, HWID_MCATYPE(0x01, 0x3) },
192
193 /* Northbridge IO Unit MCA type */
194 { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0) },
195
196 /* PCI Express Unit MCA type */
197 { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0) },
198 { SMCA_PCIE_V2, HWID_MCATYPE(0x46, 0x1) },
199
200 { SMCA_XGMI_PCS, HWID_MCATYPE(0x50, 0x0) },
201 { SMCA_NBIF, HWID_MCATYPE(0x6C, 0x0) },
202 { SMCA_SHUB, HWID_MCATYPE(0x80, 0x0) },
203 { SMCA_SATA, HWID_MCATYPE(0xA8, 0x0) },
204 { SMCA_USB, HWID_MCATYPE(0xAA, 0x0) },
205 { SMCA_USR_DP, HWID_MCATYPE(0x170, 0x0) },
206 { SMCA_USR_CP, HWID_MCATYPE(0x180, 0x0) },
207 { SMCA_GMI_PCS, HWID_MCATYPE(0x241, 0x0) },
208 { SMCA_XGMI_PHY, HWID_MCATYPE(0x259, 0x0) },
209 { SMCA_WAFL_PHY, HWID_MCATYPE(0x267, 0x0) },
210 { SMCA_GMI_PHY, HWID_MCATYPE(0x269, 0x0) },
211 };
212
213 /*
214 * In SMCA enabled processors, we can have multiple banks for a given IP type.
215 * So to define a unique name for each bank, we use a temp c-string to append
216 * the MCA_IPID[InstanceId] to type's name in get_name().
217 *
218 * InstanceId is 32 bits which is 8 characters. Make sure MAX_MCATYPE_NAME_LEN
219 * is greater than 8 plus 1 (for underscore) plus length of longest type name.
220 */
221 #define MAX_MCATYPE_NAME_LEN 30
222 static char buf_mcatype[MAX_MCATYPE_NAME_LEN];
223
224 static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks);
225
226 /*
227 * A list of the banks enabled on each logical CPU. Controls which respective
228 * descriptors to initialize later in mce_threshold_create_device().
229 */
230 static DEFINE_PER_CPU(u64, bank_map);
231
232 /* Map of banks that have more than MCA_MISC0 available. */
233 static DEFINE_PER_CPU(u64, smca_misc_banks_map);
234
235 static void amd_threshold_interrupt(void);
236 static void amd_deferred_error_interrupt(void);
237
default_deferred_error_interrupt(void)238 static void default_deferred_error_interrupt(void)
239 {
240 pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR);
241 }
242 void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt;
243
smca_set_misc_banks_map(unsigned int bank,unsigned int cpu)244 static void smca_set_misc_banks_map(unsigned int bank, unsigned int cpu)
245 {
246 u32 low, high;
247
248 /*
249 * For SMCA enabled processors, BLKPTR field of the first MISC register
250 * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4).
251 */
252 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
253 return;
254
255 if (!(low & MCI_CONFIG_MCAX))
256 return;
257
258 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high))
259 return;
260
261 if (low & MASK_BLKPTR_LO)
262 per_cpu(smca_misc_banks_map, cpu) |= BIT_ULL(bank);
263
264 }
265
smca_configure(unsigned int bank,unsigned int cpu)266 static void smca_configure(unsigned int bank, unsigned int cpu)
267 {
268 u8 *bank_counts = this_cpu_ptr(smca_bank_counts);
269 const struct smca_hwid *s_hwid;
270 unsigned int i, hwid_mcatype;
271 u32 high, low;
272 u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank);
273
274 /* Set appropriate bits in MCA_CONFIG */
275 if (!rdmsr_safe(smca_config, &low, &high)) {
276 /*
277 * OS is required to set the MCAX bit to acknowledge that it is
278 * now using the new MSR ranges and new registers under each
279 * bank. It also means that the OS will configure deferred
280 * errors in the new MCx_CONFIG register. If the bit is not set,
281 * uncorrectable errors will cause a system panic.
282 *
283 * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.)
284 */
285 high |= BIT(0);
286
287 /*
288 * SMCA sets the Deferred Error Interrupt type per bank.
289 *
290 * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us
291 * if the DeferredIntType bit field is available.
292 *
293 * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the
294 * high portion of the MSR). OS should set this to 0x1 to enable
295 * APIC based interrupt. First, check that no interrupt has been
296 * set.
297 */
298 if ((low & BIT(5)) && !((high >> 5) & 0x3))
299 high |= BIT(5);
300
301 this_cpu_ptr(mce_banks_array)[bank].lsb_in_status = !!(low & BIT(8));
302
303 wrmsr(smca_config, low, high);
304 }
305
306 smca_set_misc_banks_map(bank, cpu);
307
308 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
309 pr_warn("Failed to read MCA_IPID for bank %d\n", bank);
310 return;
311 }
312
313 hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID,
314 (high & MCI_IPID_MCATYPE) >> 16);
315
316 for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) {
317 s_hwid = &smca_hwid_mcatypes[i];
318
319 if (hwid_mcatype == s_hwid->hwid_mcatype) {
320 this_cpu_ptr(smca_banks)[bank].hwid = s_hwid;
321 this_cpu_ptr(smca_banks)[bank].id = low;
322 this_cpu_ptr(smca_banks)[bank].sysfs_id = bank_counts[s_hwid->bank_type]++;
323 break;
324 }
325 }
326 }
327
328 struct thresh_restart {
329 struct threshold_block *b;
330 int reset;
331 int set_lvt_off;
332 int lvt_off;
333 u16 old_limit;
334 };
335
is_shared_bank(int bank)336 static inline bool is_shared_bank(int bank)
337 {
338 /*
339 * Scalable MCA provides for only one core to have access to the MSRs of
340 * a shared bank.
341 */
342 if (mce_flags.smca)
343 return false;
344
345 /* Bank 4 is for northbridge reporting and is thus shared */
346 return (bank == 4);
347 }
348
bank4_names(const struct threshold_block * b)349 static const char *bank4_names(const struct threshold_block *b)
350 {
351 switch (b->address) {
352 /* MSR4_MISC0 */
353 case 0x00000413:
354 return "dram";
355
356 case 0xc0000408:
357 return "ht_links";
358
359 case 0xc0000409:
360 return "l3_cache";
361
362 default:
363 WARN(1, "Funny MSR: 0x%08x\n", b->address);
364 return "";
365 }
366 };
367
368
lvt_interrupt_supported(unsigned int bank,u32 msr_high_bits)369 static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits)
370 {
371 /*
372 * bank 4 supports APIC LVT interrupts implicitly since forever.
373 */
374 if (bank == 4)
375 return true;
376
377 /*
378 * IntP: interrupt present; if this bit is set, the thresholding
379 * bank can generate APIC LVT interrupts
380 */
381 return msr_high_bits & BIT(28);
382 }
383
lvt_off_valid(struct threshold_block * b,int apic,u32 lo,u32 hi)384 static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
385 {
386 int msr = (hi & MASK_LVTOFF_HI) >> 20;
387
388 if (apic < 0) {
389 pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt "
390 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu,
391 b->bank, b->block, b->address, hi, lo);
392 return 0;
393 }
394
395 if (apic != msr) {
396 /*
397 * On SMCA CPUs, LVT offset is programmed at a different MSR, and
398 * the BIOS provides the value. The original field where LVT offset
399 * was set is reserved. Return early here:
400 */
401 if (mce_flags.smca)
402 return 0;
403
404 pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d "
405 "for bank %d, block %d (MSR%08X=0x%x%08x)\n",
406 b->cpu, apic, b->bank, b->block, b->address, hi, lo);
407 return 0;
408 }
409
410 return 1;
411 };
412
413 /* Reprogram MCx_MISC MSR behind this threshold bank. */
threshold_restart_bank(void * _tr)414 static void threshold_restart_bank(void *_tr)
415 {
416 struct thresh_restart *tr = _tr;
417 u32 hi, lo;
418
419 /* sysfs write might race against an offline operation */
420 if (!this_cpu_read(threshold_banks) && !tr->set_lvt_off)
421 return;
422
423 rdmsr(tr->b->address, lo, hi);
424
425 if (tr->b->threshold_limit < (hi & THRESHOLD_MAX))
426 tr->reset = 1; /* limit cannot be lower than err count */
427
428 if (tr->reset) { /* reset err count and overflow bit */
429 hi =
430 (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
431 (THRESHOLD_MAX - tr->b->threshold_limit);
432 } else if (tr->old_limit) { /* change limit w/o reset */
433 int new_count = (hi & THRESHOLD_MAX) +
434 (tr->old_limit - tr->b->threshold_limit);
435
436 hi = (hi & ~MASK_ERR_COUNT_HI) |
437 (new_count & THRESHOLD_MAX);
438 }
439
440 /* clear IntType */
441 hi &= ~MASK_INT_TYPE_HI;
442
443 if (!tr->b->interrupt_capable)
444 goto done;
445
446 if (tr->set_lvt_off) {
447 if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) {
448 /* set new lvt offset */
449 hi &= ~MASK_LVTOFF_HI;
450 hi |= tr->lvt_off << 20;
451 }
452 }
453
454 if (tr->b->interrupt_enable)
455 hi |= INT_TYPE_APIC;
456
457 done:
458
459 hi |= MASK_COUNT_EN_HI;
460 wrmsr(tr->b->address, lo, hi);
461 }
462
mce_threshold_block_init(struct threshold_block * b,int offset)463 static void mce_threshold_block_init(struct threshold_block *b, int offset)
464 {
465 struct thresh_restart tr = {
466 .b = b,
467 .set_lvt_off = 1,
468 .lvt_off = offset,
469 };
470
471 b->threshold_limit = THRESHOLD_MAX;
472 threshold_restart_bank(&tr);
473 };
474
setup_APIC_mce_threshold(int reserved,int new)475 static int setup_APIC_mce_threshold(int reserved, int new)
476 {
477 if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR,
478 APIC_EILVT_MSG_FIX, 0))
479 return new;
480
481 return reserved;
482 }
483
setup_APIC_deferred_error(int reserved,int new)484 static int setup_APIC_deferred_error(int reserved, int new)
485 {
486 if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR,
487 APIC_EILVT_MSG_FIX, 0))
488 return new;
489
490 return reserved;
491 }
492
deferred_error_interrupt_enable(struct cpuinfo_x86 * c)493 static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
494 {
495 u32 low = 0, high = 0;
496 int def_offset = -1, def_new;
497
498 if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high))
499 return;
500
501 def_new = (low & MASK_DEF_LVTOFF) >> 4;
502 if (!(low & MASK_DEF_LVTOFF)) {
503 pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n");
504 def_new = DEF_LVT_OFF;
505 low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4);
506 }
507
508 def_offset = setup_APIC_deferred_error(def_offset, def_new);
509 if ((def_offset == def_new) &&
510 (deferred_error_int_vector != amd_deferred_error_interrupt))
511 deferred_error_int_vector = amd_deferred_error_interrupt;
512
513 if (!mce_flags.smca)
514 low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC;
515
516 wrmsr(MSR_CU_DEF_ERR, low, high);
517 }
518
smca_get_block_address(unsigned int bank,unsigned int block,unsigned int cpu)519 static u32 smca_get_block_address(unsigned int bank, unsigned int block,
520 unsigned int cpu)
521 {
522 if (!block)
523 return MSR_AMD64_SMCA_MCx_MISC(bank);
524
525 if (!(per_cpu(smca_misc_banks_map, cpu) & BIT_ULL(bank)))
526 return 0;
527
528 return MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
529 }
530
get_block_address(u32 current_addr,u32 low,u32 high,unsigned int bank,unsigned int block,unsigned int cpu)531 static u32 get_block_address(u32 current_addr, u32 low, u32 high,
532 unsigned int bank, unsigned int block,
533 unsigned int cpu)
534 {
535 u32 addr = 0, offset = 0;
536
537 if ((bank >= per_cpu(mce_num_banks, cpu)) || (block >= NR_BLOCKS))
538 return addr;
539
540 if (mce_flags.smca)
541 return smca_get_block_address(bank, block, cpu);
542
543 /* Fall back to method we used for older processors: */
544 switch (block) {
545 case 0:
546 addr = mca_msr_reg(bank, MCA_MISC);
547 break;
548 case 1:
549 offset = ((low & MASK_BLKPTR_LO) >> 21);
550 if (offset)
551 addr = MCG_XBLK_ADDR + offset;
552 break;
553 default:
554 addr = ++current_addr;
555 }
556 return addr;
557 }
558
559 static int
prepare_threshold_block(unsigned int bank,unsigned int block,u32 addr,int offset,u32 misc_high)560 prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr,
561 int offset, u32 misc_high)
562 {
563 unsigned int cpu = smp_processor_id();
564 u32 smca_low, smca_high;
565 struct threshold_block b;
566 int new;
567
568 if (!block)
569 per_cpu(bank_map, cpu) |= BIT_ULL(bank);
570
571 memset(&b, 0, sizeof(b));
572 b.cpu = cpu;
573 b.bank = bank;
574 b.block = block;
575 b.address = addr;
576 b.interrupt_capable = lvt_interrupt_supported(bank, misc_high);
577
578 if (!b.interrupt_capable)
579 goto done;
580
581 b.interrupt_enable = 1;
582
583 if (!mce_flags.smca) {
584 new = (misc_high & MASK_LVTOFF_HI) >> 20;
585 goto set_offset;
586 }
587
588 /* Gather LVT offset for thresholding: */
589 if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high))
590 goto out;
591
592 new = (smca_low & SMCA_THR_LVT_OFF) >> 12;
593
594 set_offset:
595 offset = setup_APIC_mce_threshold(offset, new);
596 if (offset == new)
597 thresholding_irq_en = true;
598
599 done:
600 mce_threshold_block_init(&b, offset);
601
602 out:
603 return offset;
604 }
605
amd_filter_mce(struct mce * m)606 bool amd_filter_mce(struct mce *m)
607 {
608 enum smca_bank_types bank_type = smca_get_bank_type(m->extcpu, m->bank);
609 struct cpuinfo_x86 *c = &boot_cpu_data;
610
611 /* See Family 17h Models 10h-2Fh Erratum #1114. */
612 if (c->x86 == 0x17 &&
613 c->x86_model >= 0x10 && c->x86_model <= 0x2F &&
614 bank_type == SMCA_IF && XEC(m->status, 0x3f) == 10)
615 return true;
616
617 /* NB GART TLB error reporting is disabled by default. */
618 if (c->x86 < 0x17) {
619 if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5)
620 return true;
621 }
622
623 return false;
624 }
625
626 /*
627 * Turn off thresholding banks for the following conditions:
628 * - MC4_MISC thresholding is not supported on Family 0x15.
629 * - Prevent possible spurious interrupts from the IF bank on Family 0x17
630 * Models 0x10-0x2F due to Erratum #1114.
631 */
disable_err_thresholding(struct cpuinfo_x86 * c,unsigned int bank)632 static void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank)
633 {
634 int i, num_msrs;
635 u64 hwcr;
636 bool need_toggle;
637 u32 msrs[NR_BLOCKS];
638
639 if (c->x86 == 0x15 && bank == 4) {
640 msrs[0] = 0x00000413; /* MC4_MISC0 */
641 msrs[1] = 0xc0000408; /* MC4_MISC1 */
642 num_msrs = 2;
643 } else if (c->x86 == 0x17 &&
644 (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) {
645
646 if (smca_get_bank_type(smp_processor_id(), bank) != SMCA_IF)
647 return;
648
649 msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank);
650 num_msrs = 1;
651 } else {
652 return;
653 }
654
655 rdmsrl(MSR_K7_HWCR, hwcr);
656
657 /* McStatusWrEn has to be set */
658 need_toggle = !(hwcr & BIT(18));
659 if (need_toggle)
660 wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
661
662 /* Clear CntP bit safely */
663 for (i = 0; i < num_msrs; i++)
664 msr_clear_bit(msrs[i], 62);
665
666 /* restore old settings */
667 if (need_toggle)
668 wrmsrl(MSR_K7_HWCR, hwcr);
669 }
670
671 /* cpu init entry point, called from mce.c with preempt off */
mce_amd_feature_init(struct cpuinfo_x86 * c)672 void mce_amd_feature_init(struct cpuinfo_x86 *c)
673 {
674 unsigned int bank, block, cpu = smp_processor_id();
675 u32 low = 0, high = 0, address = 0;
676 int offset = -1;
677
678
679 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) {
680 if (mce_flags.smca)
681 smca_configure(bank, cpu);
682
683 disable_err_thresholding(c, bank);
684
685 for (block = 0; block < NR_BLOCKS; ++block) {
686 address = get_block_address(address, low, high, bank, block, cpu);
687 if (!address)
688 break;
689
690 if (rdmsr_safe(address, &low, &high))
691 break;
692
693 if (!(high & MASK_VALID_HI))
694 continue;
695
696 if (!(high & MASK_CNTP_HI) ||
697 (high & MASK_LOCKED_HI))
698 continue;
699
700 offset = prepare_threshold_block(bank, block, address, offset, high);
701 }
702 }
703
704 if (mce_flags.succor)
705 deferred_error_interrupt_enable(c);
706 }
707
708 /*
709 * DRAM ECC errors are reported in the Northbridge (bank 4) with
710 * Extended Error Code 8.
711 */
legacy_mce_is_memory_error(struct mce * m)712 static bool legacy_mce_is_memory_error(struct mce *m)
713 {
714 return m->bank == 4 && XEC(m->status, 0x1f) == 8;
715 }
716
717 /*
718 * DRAM ECC errors are reported in Unified Memory Controllers with
719 * Extended Error Code 0.
720 */
smca_mce_is_memory_error(struct mce * m)721 static bool smca_mce_is_memory_error(struct mce *m)
722 {
723 enum smca_bank_types bank_type;
724
725 if (XEC(m->status, 0x3f))
726 return false;
727
728 bank_type = smca_get_bank_type(m->extcpu, m->bank);
729
730 return bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2;
731 }
732
amd_mce_is_memory_error(struct mce * m)733 bool amd_mce_is_memory_error(struct mce *m)
734 {
735 if (mce_flags.smca)
736 return smca_mce_is_memory_error(m);
737 else
738 return legacy_mce_is_memory_error(m);
739 }
740
741 /*
742 * AMD systems do not have an explicit indicator that the value in MCA_ADDR is
743 * a system physical address. Therefore, individual cases need to be detected.
744 * Future cases and checks will be added as needed.
745 *
746 * 1) General case
747 * a) Assume address is not usable.
748 * 2) Poison errors
749 * a) Indicated by MCA_STATUS[43]: poison. Defined for all banks except legacy
750 * northbridge (bank 4).
751 * b) Refers to poison consumption in the core. Does not include "no action",
752 * "action optional", or "deferred" error severities.
753 * c) Will include a usable address so that immediate action can be taken.
754 * 3) Northbridge DRAM ECC errors
755 * a) Reported in legacy bank 4 with extended error code (XEC) 8.
756 * b) MCA_STATUS[43] is *not* defined as poison in legacy bank 4. Therefore,
757 * this bit should not be checked.
758 *
759 * NOTE: SMCA UMC memory errors fall into case #1.
760 */
amd_mce_usable_address(struct mce * m)761 bool amd_mce_usable_address(struct mce *m)
762 {
763 /* Check special northbridge case 3) first. */
764 if (!mce_flags.smca) {
765 if (legacy_mce_is_memory_error(m))
766 return true;
767 else if (m->bank == 4)
768 return false;
769 }
770
771 /* Check poison bit for all other bank types. */
772 if (m->status & MCI_STATUS_POISON)
773 return true;
774
775 /* Assume address is not usable for all others. */
776 return false;
777 }
778
__log_error(unsigned int bank,u64 status,u64 addr,u64 misc)779 static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc)
780 {
781 struct mce_hw_err err;
782 struct mce *m = &err.m;
783
784 mce_prep_record(&err);
785
786 m->status = status;
787 m->misc = misc;
788 m->bank = bank;
789 m->tsc = rdtsc();
790
791 if (m->status & MCI_STATUS_ADDRV) {
792 m->addr = addr;
793
794 smca_extract_err_addr(m);
795 }
796
797 if (mce_flags.smca) {
798 rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m->ipid);
799
800 if (m->status & MCI_STATUS_SYNDV) {
801 rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m->synd);
802 rdmsrl(MSR_AMD64_SMCA_MCx_SYND1(bank), err.vendor.amd.synd1);
803 rdmsrl(MSR_AMD64_SMCA_MCx_SYND2(bank), err.vendor.amd.synd2);
804 }
805 }
806
807 mce_log(&err);
808 }
809
DEFINE_IDTENTRY_SYSVEC(sysvec_deferred_error)810 DEFINE_IDTENTRY_SYSVEC(sysvec_deferred_error)
811 {
812 trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR);
813 inc_irq_stat(irq_deferred_error_count);
814 deferred_error_int_vector();
815 trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR);
816 apic_eoi();
817 }
818
819 /*
820 * Returns true if the logged error is deferred. False, otherwise.
821 */
822 static inline bool
_log_error_bank(unsigned int bank,u32 msr_stat,u32 msr_addr,u64 misc)823 _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc)
824 {
825 u64 status, addr = 0;
826
827 rdmsrl(msr_stat, status);
828 if (!(status & MCI_STATUS_VAL))
829 return false;
830
831 if (status & MCI_STATUS_ADDRV)
832 rdmsrl(msr_addr, addr);
833
834 __log_error(bank, status, addr, misc);
835
836 wrmsrl(msr_stat, 0);
837
838 return status & MCI_STATUS_DEFERRED;
839 }
840
_log_error_deferred(unsigned int bank,u32 misc)841 static bool _log_error_deferred(unsigned int bank, u32 misc)
842 {
843 if (!_log_error_bank(bank, mca_msr_reg(bank, MCA_STATUS),
844 mca_msr_reg(bank, MCA_ADDR), misc))
845 return false;
846
847 /*
848 * Non-SMCA systems don't have MCA_DESTAT/MCA_DEADDR registers.
849 * Return true here to avoid accessing these registers.
850 */
851 if (!mce_flags.smca)
852 return true;
853
854 /* Clear MCA_DESTAT if the deferred error was logged from MCA_STATUS. */
855 wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0);
856 return true;
857 }
858
859 /*
860 * We have three scenarios for checking for Deferred errors:
861 *
862 * 1) Non-SMCA systems check MCA_STATUS and log error if found.
863 * 2) SMCA systems check MCA_STATUS. If error is found then log it and also
864 * clear MCA_DESTAT.
865 * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and
866 * log it.
867 */
log_error_deferred(unsigned int bank)868 static void log_error_deferred(unsigned int bank)
869 {
870 if (_log_error_deferred(bank, 0))
871 return;
872
873 /*
874 * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check
875 * for a valid error.
876 */
877 _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank),
878 MSR_AMD64_SMCA_MCx_DEADDR(bank), 0);
879 }
880
881 /* APIC interrupt handler for deferred errors */
amd_deferred_error_interrupt(void)882 static void amd_deferred_error_interrupt(void)
883 {
884 unsigned int bank;
885
886 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank)
887 log_error_deferred(bank);
888 }
889
log_error_thresholding(unsigned int bank,u64 misc)890 static void log_error_thresholding(unsigned int bank, u64 misc)
891 {
892 _log_error_deferred(bank, misc);
893 }
894
log_and_reset_block(struct threshold_block * block)895 static void log_and_reset_block(struct threshold_block *block)
896 {
897 struct thresh_restart tr;
898 u32 low = 0, high = 0;
899
900 if (!block)
901 return;
902
903 if (rdmsr_safe(block->address, &low, &high))
904 return;
905
906 if (!(high & MASK_OVERFLOW_HI))
907 return;
908
909 /* Log the MCE which caused the threshold event. */
910 log_error_thresholding(block->bank, ((u64)high << 32) | low);
911
912 /* Reset threshold block after logging error. */
913 memset(&tr, 0, sizeof(tr));
914 tr.b = block;
915 threshold_restart_bank(&tr);
916 }
917
918 /*
919 * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt
920 * goes off when error_count reaches threshold_limit.
921 */
amd_threshold_interrupt(void)922 static void amd_threshold_interrupt(void)
923 {
924 struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL;
925 struct threshold_bank **bp = this_cpu_read(threshold_banks);
926 unsigned int bank, cpu = smp_processor_id();
927
928 /*
929 * Validate that the threshold bank has been initialized already. The
930 * handler is installed at boot time, but on a hotplug event the
931 * interrupt might fire before the data has been initialized.
932 */
933 if (!bp)
934 return;
935
936 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) {
937 if (!(per_cpu(bank_map, cpu) & BIT_ULL(bank)))
938 continue;
939
940 first_block = bp[bank]->blocks;
941 if (!first_block)
942 continue;
943
944 /*
945 * The first block is also the head of the list. Check it first
946 * before iterating over the rest.
947 */
948 log_and_reset_block(first_block);
949 list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj)
950 log_and_reset_block(block);
951 }
952 }
953
954 /*
955 * Sysfs Interface
956 */
957
958 struct threshold_attr {
959 struct attribute attr;
960 ssize_t (*show) (struct threshold_block *, char *);
961 ssize_t (*store) (struct threshold_block *, const char *, size_t count);
962 };
963
964 #define SHOW_FIELDS(name) \
965 static ssize_t show_ ## name(struct threshold_block *b, char *buf) \
966 { \
967 return sprintf(buf, "%lu\n", (unsigned long) b->name); \
968 }
969 SHOW_FIELDS(interrupt_enable)
SHOW_FIELDS(threshold_limit)970 SHOW_FIELDS(threshold_limit)
971
972 static ssize_t
973 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size)
974 {
975 struct thresh_restart tr;
976 unsigned long new;
977
978 if (!b->interrupt_capable)
979 return -EINVAL;
980
981 if (kstrtoul(buf, 0, &new) < 0)
982 return -EINVAL;
983
984 b->interrupt_enable = !!new;
985
986 memset(&tr, 0, sizeof(tr));
987 tr.b = b;
988
989 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1))
990 return -ENODEV;
991
992 return size;
993 }
994
995 static ssize_t
store_threshold_limit(struct threshold_block * b,const char * buf,size_t size)996 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size)
997 {
998 struct thresh_restart tr;
999 unsigned long new;
1000
1001 if (kstrtoul(buf, 0, &new) < 0)
1002 return -EINVAL;
1003
1004 if (new > THRESHOLD_MAX)
1005 new = THRESHOLD_MAX;
1006 if (new < 1)
1007 new = 1;
1008
1009 memset(&tr, 0, sizeof(tr));
1010 tr.old_limit = b->threshold_limit;
1011 b->threshold_limit = new;
1012 tr.b = b;
1013
1014 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1))
1015 return -ENODEV;
1016
1017 return size;
1018 }
1019
show_error_count(struct threshold_block * b,char * buf)1020 static ssize_t show_error_count(struct threshold_block *b, char *buf)
1021 {
1022 u32 lo, hi;
1023
1024 /* CPU might be offline by now */
1025 if (rdmsr_on_cpu(b->cpu, b->address, &lo, &hi))
1026 return -ENODEV;
1027
1028 return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) -
1029 (THRESHOLD_MAX - b->threshold_limit)));
1030 }
1031
1032 static struct threshold_attr error_count = {
1033 .attr = {.name = __stringify(error_count), .mode = 0444 },
1034 .show = show_error_count,
1035 };
1036
1037 #define RW_ATTR(val) \
1038 static struct threshold_attr val = { \
1039 .attr = {.name = __stringify(val), .mode = 0644 }, \
1040 .show = show_## val, \
1041 .store = store_## val, \
1042 };
1043
1044 RW_ATTR(interrupt_enable);
1045 RW_ATTR(threshold_limit);
1046
1047 static struct attribute *default_attrs[] = {
1048 &threshold_limit.attr,
1049 &error_count.attr,
1050 NULL, /* possibly interrupt_enable if supported, see below */
1051 NULL,
1052 };
1053 ATTRIBUTE_GROUPS(default);
1054
1055 #define to_block(k) container_of(k, struct threshold_block, kobj)
1056 #define to_attr(a) container_of(a, struct threshold_attr, attr)
1057
show(struct kobject * kobj,struct attribute * attr,char * buf)1058 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
1059 {
1060 struct threshold_block *b = to_block(kobj);
1061 struct threshold_attr *a = to_attr(attr);
1062 ssize_t ret;
1063
1064 ret = a->show ? a->show(b, buf) : -EIO;
1065
1066 return ret;
1067 }
1068
store(struct kobject * kobj,struct attribute * attr,const char * buf,size_t count)1069 static ssize_t store(struct kobject *kobj, struct attribute *attr,
1070 const char *buf, size_t count)
1071 {
1072 struct threshold_block *b = to_block(kobj);
1073 struct threshold_attr *a = to_attr(attr);
1074 ssize_t ret;
1075
1076 ret = a->store ? a->store(b, buf, count) : -EIO;
1077
1078 return ret;
1079 }
1080
1081 static const struct sysfs_ops threshold_ops = {
1082 .show = show,
1083 .store = store,
1084 };
1085
1086 static void threshold_block_release(struct kobject *kobj);
1087
1088 static const struct kobj_type threshold_ktype = {
1089 .sysfs_ops = &threshold_ops,
1090 .default_groups = default_groups,
1091 .release = threshold_block_release,
1092 };
1093
get_name(unsigned int cpu,unsigned int bank,struct threshold_block * b)1094 static const char *get_name(unsigned int cpu, unsigned int bank, struct threshold_block *b)
1095 {
1096 enum smca_bank_types bank_type;
1097
1098 if (!mce_flags.smca) {
1099 if (b && bank == 4)
1100 return bank4_names(b);
1101
1102 return th_names[bank];
1103 }
1104
1105 bank_type = smca_get_bank_type(cpu, bank);
1106 if (bank_type >= N_SMCA_BANK_TYPES)
1107 return NULL;
1108
1109 if (b && (bank_type == SMCA_UMC || bank_type == SMCA_UMC_V2)) {
1110 if (b->block < ARRAY_SIZE(smca_umc_block_names))
1111 return smca_umc_block_names[b->block];
1112 return NULL;
1113 }
1114
1115 if (per_cpu(smca_bank_counts, cpu)[bank_type] == 1)
1116 return smca_get_name(bank_type);
1117
1118 snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN,
1119 "%s_%u", smca_get_name(bank_type),
1120 per_cpu(smca_banks, cpu)[bank].sysfs_id);
1121 return buf_mcatype;
1122 }
1123
allocate_threshold_blocks(unsigned int cpu,struct threshold_bank * tb,unsigned int bank,unsigned int block,u32 address)1124 static int allocate_threshold_blocks(unsigned int cpu, struct threshold_bank *tb,
1125 unsigned int bank, unsigned int block,
1126 u32 address)
1127 {
1128 struct threshold_block *b = NULL;
1129 u32 low, high;
1130 int err;
1131
1132 if ((bank >= this_cpu_read(mce_num_banks)) || (block >= NR_BLOCKS))
1133 return 0;
1134
1135 if (rdmsr_safe(address, &low, &high))
1136 return 0;
1137
1138 if (!(high & MASK_VALID_HI)) {
1139 if (block)
1140 goto recurse;
1141 else
1142 return 0;
1143 }
1144
1145 if (!(high & MASK_CNTP_HI) ||
1146 (high & MASK_LOCKED_HI))
1147 goto recurse;
1148
1149 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
1150 if (!b)
1151 return -ENOMEM;
1152
1153 b->block = block;
1154 b->bank = bank;
1155 b->cpu = cpu;
1156 b->address = address;
1157 b->interrupt_enable = 0;
1158 b->interrupt_capable = lvt_interrupt_supported(bank, high);
1159 b->threshold_limit = THRESHOLD_MAX;
1160
1161 if (b->interrupt_capable) {
1162 default_attrs[2] = &interrupt_enable.attr;
1163 b->interrupt_enable = 1;
1164 } else {
1165 default_attrs[2] = NULL;
1166 }
1167
1168 INIT_LIST_HEAD(&b->miscj);
1169
1170 /* This is safe as @tb is not visible yet */
1171 if (tb->blocks)
1172 list_add(&b->miscj, &tb->blocks->miscj);
1173 else
1174 tb->blocks = b;
1175
1176 err = kobject_init_and_add(&b->kobj, &threshold_ktype, tb->kobj, get_name(cpu, bank, b));
1177 if (err)
1178 goto out_free;
1179 recurse:
1180 address = get_block_address(address, low, high, bank, ++block, cpu);
1181 if (!address)
1182 return 0;
1183
1184 err = allocate_threshold_blocks(cpu, tb, bank, block, address);
1185 if (err)
1186 goto out_free;
1187
1188 if (b)
1189 kobject_uevent(&b->kobj, KOBJ_ADD);
1190
1191 return 0;
1192
1193 out_free:
1194 if (b) {
1195 list_del(&b->miscj);
1196 kobject_put(&b->kobj);
1197 }
1198 return err;
1199 }
1200
__threshold_add_blocks(struct threshold_bank * b)1201 static int __threshold_add_blocks(struct threshold_bank *b)
1202 {
1203 struct list_head *head = &b->blocks->miscj;
1204 struct threshold_block *pos = NULL;
1205 struct threshold_block *tmp = NULL;
1206 int err = 0;
1207
1208 err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name);
1209 if (err)
1210 return err;
1211
1212 list_for_each_entry_safe(pos, tmp, head, miscj) {
1213
1214 err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name);
1215 if (err) {
1216 list_for_each_entry_safe_reverse(pos, tmp, head, miscj)
1217 kobject_del(&pos->kobj);
1218
1219 return err;
1220 }
1221 }
1222 return err;
1223 }
1224
threshold_create_bank(struct threshold_bank ** bp,unsigned int cpu,unsigned int bank)1225 static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu,
1226 unsigned int bank)
1227 {
1228 struct device *dev = this_cpu_read(mce_device);
1229 struct amd_northbridge *nb = NULL;
1230 struct threshold_bank *b = NULL;
1231 const char *name = get_name(cpu, bank, NULL);
1232 int err = 0;
1233
1234 if (!dev)
1235 return -ENODEV;
1236
1237 if (is_shared_bank(bank)) {
1238 nb = node_to_amd_nb(topology_amd_node_id(cpu));
1239
1240 /* threshold descriptor already initialized on this node? */
1241 if (nb && nb->bank4) {
1242 /* yes, use it */
1243 b = nb->bank4;
1244 err = kobject_add(b->kobj, &dev->kobj, name);
1245 if (err)
1246 goto out;
1247
1248 bp[bank] = b;
1249 refcount_inc(&b->cpus);
1250
1251 err = __threshold_add_blocks(b);
1252
1253 goto out;
1254 }
1255 }
1256
1257 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
1258 if (!b) {
1259 err = -ENOMEM;
1260 goto out;
1261 }
1262
1263 /* Associate the bank with the per-CPU MCE device */
1264 b->kobj = kobject_create_and_add(name, &dev->kobj);
1265 if (!b->kobj) {
1266 err = -EINVAL;
1267 goto out_free;
1268 }
1269
1270 if (is_shared_bank(bank)) {
1271 b->shared = 1;
1272 refcount_set(&b->cpus, 1);
1273
1274 /* nb is already initialized, see above */
1275 if (nb) {
1276 WARN_ON(nb->bank4);
1277 nb->bank4 = b;
1278 }
1279 }
1280
1281 err = allocate_threshold_blocks(cpu, b, bank, 0, mca_msr_reg(bank, MCA_MISC));
1282 if (err)
1283 goto out_kobj;
1284
1285 bp[bank] = b;
1286 return 0;
1287
1288 out_kobj:
1289 kobject_put(b->kobj);
1290 out_free:
1291 kfree(b);
1292 out:
1293 return err;
1294 }
1295
threshold_block_release(struct kobject * kobj)1296 static void threshold_block_release(struct kobject *kobj)
1297 {
1298 kfree(to_block(kobj));
1299 }
1300
deallocate_threshold_blocks(struct threshold_bank * bank)1301 static void deallocate_threshold_blocks(struct threshold_bank *bank)
1302 {
1303 struct threshold_block *pos, *tmp;
1304
1305 list_for_each_entry_safe(pos, tmp, &bank->blocks->miscj, miscj) {
1306 list_del(&pos->miscj);
1307 kobject_put(&pos->kobj);
1308 }
1309
1310 kobject_put(&bank->blocks->kobj);
1311 }
1312
__threshold_remove_blocks(struct threshold_bank * b)1313 static void __threshold_remove_blocks(struct threshold_bank *b)
1314 {
1315 struct threshold_block *pos = NULL;
1316 struct threshold_block *tmp = NULL;
1317
1318 kobject_put(b->kobj);
1319
1320 list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj)
1321 kobject_put(b->kobj);
1322 }
1323
threshold_remove_bank(struct threshold_bank * bank)1324 static void threshold_remove_bank(struct threshold_bank *bank)
1325 {
1326 struct amd_northbridge *nb;
1327
1328 if (!bank->blocks)
1329 goto out_free;
1330
1331 if (!bank->shared)
1332 goto out_dealloc;
1333
1334 if (!refcount_dec_and_test(&bank->cpus)) {
1335 __threshold_remove_blocks(bank);
1336 return;
1337 } else {
1338 /*
1339 * The last CPU on this node using the shared bank is going
1340 * away, remove that bank now.
1341 */
1342 nb = node_to_amd_nb(topology_amd_node_id(smp_processor_id()));
1343 nb->bank4 = NULL;
1344 }
1345
1346 out_dealloc:
1347 deallocate_threshold_blocks(bank);
1348
1349 out_free:
1350 kobject_put(bank->kobj);
1351 kfree(bank);
1352 }
1353
__threshold_remove_device(struct threshold_bank ** bp)1354 static void __threshold_remove_device(struct threshold_bank **bp)
1355 {
1356 unsigned int bank, numbanks = this_cpu_read(mce_num_banks);
1357
1358 for (bank = 0; bank < numbanks; bank++) {
1359 if (!bp[bank])
1360 continue;
1361
1362 threshold_remove_bank(bp[bank]);
1363 bp[bank] = NULL;
1364 }
1365 kfree(bp);
1366 }
1367
mce_threshold_remove_device(unsigned int cpu)1368 int mce_threshold_remove_device(unsigned int cpu)
1369 {
1370 struct threshold_bank **bp = this_cpu_read(threshold_banks);
1371
1372 if (!bp)
1373 return 0;
1374
1375 /*
1376 * Clear the pointer before cleaning up, so that the interrupt won't
1377 * touch anything of this.
1378 */
1379 this_cpu_write(threshold_banks, NULL);
1380
1381 __threshold_remove_device(bp);
1382 return 0;
1383 }
1384
1385 /**
1386 * mce_threshold_create_device - Create the per-CPU MCE threshold device
1387 * @cpu: The plugged in CPU
1388 *
1389 * Create directories and files for all valid threshold banks.
1390 *
1391 * This is invoked from the CPU hotplug callback which was installed in
1392 * mcheck_init_device(). The invocation happens in context of the hotplug
1393 * thread running on @cpu. The callback is invoked on all CPUs which are
1394 * online when the callback is installed or during a real hotplug event.
1395 */
mce_threshold_create_device(unsigned int cpu)1396 int mce_threshold_create_device(unsigned int cpu)
1397 {
1398 unsigned int numbanks, bank;
1399 struct threshold_bank **bp;
1400 int err;
1401
1402 if (!mce_flags.amd_threshold)
1403 return 0;
1404
1405 bp = this_cpu_read(threshold_banks);
1406 if (bp)
1407 return 0;
1408
1409 numbanks = this_cpu_read(mce_num_banks);
1410 bp = kcalloc(numbanks, sizeof(*bp), GFP_KERNEL);
1411 if (!bp)
1412 return -ENOMEM;
1413
1414 for (bank = 0; bank < numbanks; ++bank) {
1415 if (!(this_cpu_read(bank_map) & BIT_ULL(bank)))
1416 continue;
1417 err = threshold_create_bank(bp, cpu, bank);
1418 if (err) {
1419 __threshold_remove_device(bp);
1420 return err;
1421 }
1422 }
1423 this_cpu_write(threshold_banks, bp);
1424
1425 if (thresholding_irq_en)
1426 mce_threshold_vector = amd_threshold_interrupt;
1427 return 0;
1428 }
1429