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 struct smca_bank_name {
91 const char *name; /* Short name for sysfs */
92 const char *long_name; /* Long name for pretty-printing */
93 };
94
95 static struct smca_bank_name smca_names[] = {
96 [SMCA_LS ... SMCA_LS_V2] = { "load_store", "Load Store Unit" },
97 [SMCA_IF] = { "insn_fetch", "Instruction Fetch Unit" },
98 [SMCA_L2_CACHE] = { "l2_cache", "L2 Cache" },
99 [SMCA_DE] = { "decode_unit", "Decode Unit" },
100 [SMCA_RESERVED] = { "reserved", "Reserved" },
101 [SMCA_EX] = { "execution_unit", "Execution Unit" },
102 [SMCA_FP] = { "floating_point", "Floating Point Unit" },
103 [SMCA_L3_CACHE] = { "l3_cache", "L3 Cache" },
104 [SMCA_CS ... SMCA_CS_V2] = { "coherent_slave", "Coherent Slave" },
105 [SMCA_PIE] = { "pie", "Power, Interrupts, etc." },
106
107 /* UMC v2 is separate because both of them can exist in a single system. */
108 [SMCA_UMC] = { "umc", "Unified Memory Controller" },
109 [SMCA_UMC_V2] = { "umc_v2", "Unified Memory Controller v2" },
110 [SMCA_PB] = { "param_block", "Parameter Block" },
111 [SMCA_PSP ... SMCA_PSP_V2] = { "psp", "Platform Security Processor" },
112 [SMCA_SMU ... SMCA_SMU_V2] = { "smu", "System Management Unit" },
113 [SMCA_MP5] = { "mp5", "Microprocessor 5 Unit" },
114 [SMCA_MPDMA] = { "mpdma", "MPDMA Unit" },
115 [SMCA_NBIO] = { "nbio", "Northbridge IO Unit" },
116 [SMCA_PCIE ... SMCA_PCIE_V2] = { "pcie", "PCI Express Unit" },
117 [SMCA_XGMI_PCS] = { "xgmi_pcs", "Ext Global Memory Interconnect PCS Unit" },
118 [SMCA_NBIF] = { "nbif", "NBIF Unit" },
119 [SMCA_SHUB] = { "shub", "System Hub Unit" },
120 [SMCA_SATA] = { "sata", "SATA Unit" },
121 [SMCA_USB] = { "usb", "USB Unit" },
122 [SMCA_GMI_PCS] = { "gmi_pcs", "Global Memory Interconnect PCS Unit" },
123 [SMCA_XGMI_PHY] = { "xgmi_phy", "Ext Global Memory Interconnect PHY Unit" },
124 [SMCA_WAFL_PHY] = { "wafl_phy", "WAFL PHY Unit" },
125 [SMCA_GMI_PHY] = { "gmi_phy", "Global Memory Interconnect PHY Unit" },
126 };
127
smca_get_name(enum smca_bank_types t)128 static const char *smca_get_name(enum smca_bank_types t)
129 {
130 if (t >= N_SMCA_BANK_TYPES)
131 return NULL;
132
133 return smca_names[t].name;
134 }
135
smca_get_long_name(enum smca_bank_types t)136 const char *smca_get_long_name(enum smca_bank_types t)
137 {
138 if (t >= N_SMCA_BANK_TYPES)
139 return NULL;
140
141 return smca_names[t].long_name;
142 }
143 EXPORT_SYMBOL_GPL(smca_get_long_name);
144
smca_get_bank_type(unsigned int cpu,unsigned int bank)145 enum smca_bank_types smca_get_bank_type(unsigned int cpu, unsigned int bank)
146 {
147 struct smca_bank *b;
148
149 if (bank >= MAX_NR_BANKS)
150 return N_SMCA_BANK_TYPES;
151
152 b = &per_cpu(smca_banks, cpu)[bank];
153 if (!b->hwid)
154 return N_SMCA_BANK_TYPES;
155
156 return b->hwid->bank_type;
157 }
158 EXPORT_SYMBOL_GPL(smca_get_bank_type);
159
160 static const struct smca_hwid smca_hwid_mcatypes[] = {
161 /* { bank_type, hwid_mcatype } */
162
163 /* Reserved type */
164 { SMCA_RESERVED, HWID_MCATYPE(0x00, 0x0) },
165
166 /* ZN Core (HWID=0xB0) MCA types */
167 { SMCA_LS, HWID_MCATYPE(0xB0, 0x0) },
168 { SMCA_LS_V2, HWID_MCATYPE(0xB0, 0x10) },
169 { SMCA_IF, HWID_MCATYPE(0xB0, 0x1) },
170 { SMCA_L2_CACHE, HWID_MCATYPE(0xB0, 0x2) },
171 { SMCA_DE, HWID_MCATYPE(0xB0, 0x3) },
172 /* HWID 0xB0 MCATYPE 0x4 is Reserved */
173 { SMCA_EX, HWID_MCATYPE(0xB0, 0x5) },
174 { SMCA_FP, HWID_MCATYPE(0xB0, 0x6) },
175 { SMCA_L3_CACHE, HWID_MCATYPE(0xB0, 0x7) },
176
177 /* Data Fabric MCA types */
178 { SMCA_CS, HWID_MCATYPE(0x2E, 0x0) },
179 { SMCA_PIE, HWID_MCATYPE(0x2E, 0x1) },
180 { SMCA_CS_V2, HWID_MCATYPE(0x2E, 0x2) },
181
182 /* Unified Memory Controller MCA type */
183 { SMCA_UMC, HWID_MCATYPE(0x96, 0x0) },
184 { SMCA_UMC_V2, HWID_MCATYPE(0x96, 0x1) },
185
186 /* Parameter Block MCA type */
187 { SMCA_PB, HWID_MCATYPE(0x05, 0x0) },
188
189 /* Platform Security Processor MCA type */
190 { SMCA_PSP, HWID_MCATYPE(0xFF, 0x0) },
191 { SMCA_PSP_V2, HWID_MCATYPE(0xFF, 0x1) },
192
193 /* System Management Unit MCA type */
194 { SMCA_SMU, HWID_MCATYPE(0x01, 0x0) },
195 { SMCA_SMU_V2, HWID_MCATYPE(0x01, 0x1) },
196
197 /* Microprocessor 5 Unit MCA type */
198 { SMCA_MP5, HWID_MCATYPE(0x01, 0x2) },
199
200 /* MPDMA MCA type */
201 { SMCA_MPDMA, HWID_MCATYPE(0x01, 0x3) },
202
203 /* Northbridge IO Unit MCA type */
204 { SMCA_NBIO, HWID_MCATYPE(0x18, 0x0) },
205
206 /* PCI Express Unit MCA type */
207 { SMCA_PCIE, HWID_MCATYPE(0x46, 0x0) },
208 { SMCA_PCIE_V2, HWID_MCATYPE(0x46, 0x1) },
209
210 { SMCA_XGMI_PCS, HWID_MCATYPE(0x50, 0x0) },
211 { SMCA_NBIF, HWID_MCATYPE(0x6C, 0x0) },
212 { SMCA_SHUB, HWID_MCATYPE(0x80, 0x0) },
213 { SMCA_SATA, HWID_MCATYPE(0xA8, 0x0) },
214 { SMCA_USB, HWID_MCATYPE(0xAA, 0x0) },
215 { SMCA_GMI_PCS, HWID_MCATYPE(0x241, 0x0) },
216 { SMCA_XGMI_PHY, HWID_MCATYPE(0x259, 0x0) },
217 { SMCA_WAFL_PHY, HWID_MCATYPE(0x267, 0x0) },
218 { SMCA_GMI_PHY, HWID_MCATYPE(0x269, 0x0) },
219 };
220
221 /*
222 * In SMCA enabled processors, we can have multiple banks for a given IP type.
223 * So to define a unique name for each bank, we use a temp c-string to append
224 * the MCA_IPID[InstanceId] to type's name in get_name().
225 *
226 * InstanceId is 32 bits which is 8 characters. Make sure MAX_MCATYPE_NAME_LEN
227 * is greater than 8 plus 1 (for underscore) plus length of longest type name.
228 */
229 #define MAX_MCATYPE_NAME_LEN 30
230 static char buf_mcatype[MAX_MCATYPE_NAME_LEN];
231
232 static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks);
233
234 /*
235 * A list of the banks enabled on each logical CPU. Controls which respective
236 * descriptors to initialize later in mce_threshold_create_device().
237 */
238 static DEFINE_PER_CPU(unsigned int, bank_map);
239
240 /* Map of banks that have more than MCA_MISC0 available. */
241 static DEFINE_PER_CPU(u32, smca_misc_banks_map);
242
243 static void amd_threshold_interrupt(void);
244 static void amd_deferred_error_interrupt(void);
245
default_deferred_error_interrupt(void)246 static void default_deferred_error_interrupt(void)
247 {
248 pr_err("Unexpected deferred interrupt at vector %x\n", DEFERRED_ERROR_VECTOR);
249 }
250 void (*deferred_error_int_vector)(void) = default_deferred_error_interrupt;
251
smca_set_misc_banks_map(unsigned int bank,unsigned int cpu)252 static void smca_set_misc_banks_map(unsigned int bank, unsigned int cpu)
253 {
254 u32 low, high;
255
256 /*
257 * For SMCA enabled processors, BLKPTR field of the first MISC register
258 * (MCx_MISC0) indicates presence of additional MISC regs set (MISC1-4).
259 */
260 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_CONFIG(bank), &low, &high))
261 return;
262
263 if (!(low & MCI_CONFIG_MCAX))
264 return;
265
266 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_MISC(bank), &low, &high))
267 return;
268
269 if (low & MASK_BLKPTR_LO)
270 per_cpu(smca_misc_banks_map, cpu) |= BIT(bank);
271
272 }
273
smca_configure(unsigned int bank,unsigned int cpu)274 static void smca_configure(unsigned int bank, unsigned int cpu)
275 {
276 u8 *bank_counts = this_cpu_ptr(smca_bank_counts);
277 const struct smca_hwid *s_hwid;
278 unsigned int i, hwid_mcatype;
279 u32 high, low;
280 u32 smca_config = MSR_AMD64_SMCA_MCx_CONFIG(bank);
281
282 /* Set appropriate bits in MCA_CONFIG */
283 if (!rdmsr_safe(smca_config, &low, &high)) {
284 /*
285 * OS is required to set the MCAX bit to acknowledge that it is
286 * now using the new MSR ranges and new registers under each
287 * bank. It also means that the OS will configure deferred
288 * errors in the new MCx_CONFIG register. If the bit is not set,
289 * uncorrectable errors will cause a system panic.
290 *
291 * MCA_CONFIG[MCAX] is bit 32 (0 in the high portion of the MSR.)
292 */
293 high |= BIT(0);
294
295 /*
296 * SMCA sets the Deferred Error Interrupt type per bank.
297 *
298 * MCA_CONFIG[DeferredIntTypeSupported] is bit 5, and tells us
299 * if the DeferredIntType bit field is available.
300 *
301 * MCA_CONFIG[DeferredIntType] is bits [38:37] ([6:5] in the
302 * high portion of the MSR). OS should set this to 0x1 to enable
303 * APIC based interrupt. First, check that no interrupt has been
304 * set.
305 */
306 if ((low & BIT(5)) && !((high >> 5) & 0x3))
307 high |= BIT(5);
308
309 wrmsr(smca_config, low, high);
310 }
311
312 smca_set_misc_banks_map(bank, cpu);
313
314 if (rdmsr_safe(MSR_AMD64_SMCA_MCx_IPID(bank), &low, &high)) {
315 pr_warn("Failed to read MCA_IPID for bank %d\n", bank);
316 return;
317 }
318
319 hwid_mcatype = HWID_MCATYPE(high & MCI_IPID_HWID,
320 (high & MCI_IPID_MCATYPE) >> 16);
321
322 for (i = 0; i < ARRAY_SIZE(smca_hwid_mcatypes); i++) {
323 s_hwid = &smca_hwid_mcatypes[i];
324
325 if (hwid_mcatype == s_hwid->hwid_mcatype) {
326 this_cpu_ptr(smca_banks)[bank].hwid = s_hwid;
327 this_cpu_ptr(smca_banks)[bank].id = low;
328 this_cpu_ptr(smca_banks)[bank].sysfs_id = bank_counts[s_hwid->bank_type]++;
329 break;
330 }
331 }
332 }
333
334 struct thresh_restart {
335 struct threshold_block *b;
336 int reset;
337 int set_lvt_off;
338 int lvt_off;
339 u16 old_limit;
340 };
341
is_shared_bank(int bank)342 static inline bool is_shared_bank(int bank)
343 {
344 /*
345 * Scalable MCA provides for only one core to have access to the MSRs of
346 * a shared bank.
347 */
348 if (mce_flags.smca)
349 return false;
350
351 /* Bank 4 is for northbridge reporting and is thus shared */
352 return (bank == 4);
353 }
354
bank4_names(const struct threshold_block * b)355 static const char *bank4_names(const struct threshold_block *b)
356 {
357 switch (b->address) {
358 /* MSR4_MISC0 */
359 case 0x00000413:
360 return "dram";
361
362 case 0xc0000408:
363 return "ht_links";
364
365 case 0xc0000409:
366 return "l3_cache";
367
368 default:
369 WARN(1, "Funny MSR: 0x%08x\n", b->address);
370 return "";
371 }
372 };
373
374
lvt_interrupt_supported(unsigned int bank,u32 msr_high_bits)375 static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits)
376 {
377 /*
378 * bank 4 supports APIC LVT interrupts implicitly since forever.
379 */
380 if (bank == 4)
381 return true;
382
383 /*
384 * IntP: interrupt present; if this bit is set, the thresholding
385 * bank can generate APIC LVT interrupts
386 */
387 return msr_high_bits & BIT(28);
388 }
389
lvt_off_valid(struct threshold_block * b,int apic,u32 lo,u32 hi)390 static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
391 {
392 int msr = (hi & MASK_LVTOFF_HI) >> 20;
393
394 if (apic < 0) {
395 pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt "
396 "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu,
397 b->bank, b->block, b->address, hi, lo);
398 return 0;
399 }
400
401 if (apic != msr) {
402 /*
403 * On SMCA CPUs, LVT offset is programmed at a different MSR, and
404 * the BIOS provides the value. The original field where LVT offset
405 * was set is reserved. Return early here:
406 */
407 if (mce_flags.smca)
408 return 0;
409
410 pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d "
411 "for bank %d, block %d (MSR%08X=0x%x%08x)\n",
412 b->cpu, apic, b->bank, b->block, b->address, hi, lo);
413 return 0;
414 }
415
416 return 1;
417 };
418
419 /* Reprogram MCx_MISC MSR behind this threshold bank. */
threshold_restart_bank(void * _tr)420 static void threshold_restart_bank(void *_tr)
421 {
422 struct thresh_restart *tr = _tr;
423 u32 hi, lo;
424
425 /* sysfs write might race against an offline operation */
426 if (!this_cpu_read(threshold_banks) && !tr->set_lvt_off)
427 return;
428
429 rdmsr(tr->b->address, lo, hi);
430
431 if (tr->b->threshold_limit < (hi & THRESHOLD_MAX))
432 tr->reset = 1; /* limit cannot be lower than err count */
433
434 if (tr->reset) { /* reset err count and overflow bit */
435 hi =
436 (hi & ~(MASK_ERR_COUNT_HI | MASK_OVERFLOW_HI)) |
437 (THRESHOLD_MAX - tr->b->threshold_limit);
438 } else if (tr->old_limit) { /* change limit w/o reset */
439 int new_count = (hi & THRESHOLD_MAX) +
440 (tr->old_limit - tr->b->threshold_limit);
441
442 hi = (hi & ~MASK_ERR_COUNT_HI) |
443 (new_count & THRESHOLD_MAX);
444 }
445
446 /* clear IntType */
447 hi &= ~MASK_INT_TYPE_HI;
448
449 if (!tr->b->interrupt_capable)
450 goto done;
451
452 if (tr->set_lvt_off) {
453 if (lvt_off_valid(tr->b, tr->lvt_off, lo, hi)) {
454 /* set new lvt offset */
455 hi &= ~MASK_LVTOFF_HI;
456 hi |= tr->lvt_off << 20;
457 }
458 }
459
460 if (tr->b->interrupt_enable)
461 hi |= INT_TYPE_APIC;
462
463 done:
464
465 hi |= MASK_COUNT_EN_HI;
466 wrmsr(tr->b->address, lo, hi);
467 }
468
mce_threshold_block_init(struct threshold_block * b,int offset)469 static void mce_threshold_block_init(struct threshold_block *b, int offset)
470 {
471 struct thresh_restart tr = {
472 .b = b,
473 .set_lvt_off = 1,
474 .lvt_off = offset,
475 };
476
477 b->threshold_limit = THRESHOLD_MAX;
478 threshold_restart_bank(&tr);
479 };
480
setup_APIC_mce_threshold(int reserved,int new)481 static int setup_APIC_mce_threshold(int reserved, int new)
482 {
483 if (reserved < 0 && !setup_APIC_eilvt(new, THRESHOLD_APIC_VECTOR,
484 APIC_EILVT_MSG_FIX, 0))
485 return new;
486
487 return reserved;
488 }
489
setup_APIC_deferred_error(int reserved,int new)490 static int setup_APIC_deferred_error(int reserved, int new)
491 {
492 if (reserved < 0 && !setup_APIC_eilvt(new, DEFERRED_ERROR_VECTOR,
493 APIC_EILVT_MSG_FIX, 0))
494 return new;
495
496 return reserved;
497 }
498
deferred_error_interrupt_enable(struct cpuinfo_x86 * c)499 static void deferred_error_interrupt_enable(struct cpuinfo_x86 *c)
500 {
501 u32 low = 0, high = 0;
502 int def_offset = -1, def_new;
503
504 if (rdmsr_safe(MSR_CU_DEF_ERR, &low, &high))
505 return;
506
507 def_new = (low & MASK_DEF_LVTOFF) >> 4;
508 if (!(low & MASK_DEF_LVTOFF)) {
509 pr_err(FW_BUG "Your BIOS is not setting up LVT offset 0x2 for deferred error IRQs correctly.\n");
510 def_new = DEF_LVT_OFF;
511 low = (low & ~MASK_DEF_LVTOFF) | (DEF_LVT_OFF << 4);
512 }
513
514 def_offset = setup_APIC_deferred_error(def_offset, def_new);
515 if ((def_offset == def_new) &&
516 (deferred_error_int_vector != amd_deferred_error_interrupt))
517 deferred_error_int_vector = amd_deferred_error_interrupt;
518
519 if (!mce_flags.smca)
520 low = (low & ~MASK_DEF_INT_TYPE) | DEF_INT_TYPE_APIC;
521
522 wrmsr(MSR_CU_DEF_ERR, low, high);
523 }
524
smca_get_block_address(unsigned int bank,unsigned int block,unsigned int cpu)525 static u32 smca_get_block_address(unsigned int bank, unsigned int block,
526 unsigned int cpu)
527 {
528 if (!block)
529 return MSR_AMD64_SMCA_MCx_MISC(bank);
530
531 if (!(per_cpu(smca_misc_banks_map, cpu) & BIT(bank)))
532 return 0;
533
534 return MSR_AMD64_SMCA_MCx_MISCy(bank, block - 1);
535 }
536
get_block_address(u32 current_addr,u32 low,u32 high,unsigned int bank,unsigned int block,unsigned int cpu)537 static u32 get_block_address(u32 current_addr, u32 low, u32 high,
538 unsigned int bank, unsigned int block,
539 unsigned int cpu)
540 {
541 u32 addr = 0, offset = 0;
542
543 if ((bank >= per_cpu(mce_num_banks, cpu)) || (block >= NR_BLOCKS))
544 return addr;
545
546 if (mce_flags.smca)
547 return smca_get_block_address(bank, block, cpu);
548
549 /* Fall back to method we used for older processors: */
550 switch (block) {
551 case 0:
552 addr = mca_msr_reg(bank, MCA_MISC);
553 break;
554 case 1:
555 offset = ((low & MASK_BLKPTR_LO) >> 21);
556 if (offset)
557 addr = MCG_XBLK_ADDR + offset;
558 break;
559 default:
560 addr = ++current_addr;
561 }
562 return addr;
563 }
564
565 static int
prepare_threshold_block(unsigned int bank,unsigned int block,u32 addr,int offset,u32 misc_high)566 prepare_threshold_block(unsigned int bank, unsigned int block, u32 addr,
567 int offset, u32 misc_high)
568 {
569 unsigned int cpu = smp_processor_id();
570 u32 smca_low, smca_high;
571 struct threshold_block b;
572 int new;
573
574 if (!block)
575 per_cpu(bank_map, cpu) |= (1 << bank);
576
577 memset(&b, 0, sizeof(b));
578 b.cpu = cpu;
579 b.bank = bank;
580 b.block = block;
581 b.address = addr;
582 b.interrupt_capable = lvt_interrupt_supported(bank, misc_high);
583
584 if (!b.interrupt_capable)
585 goto done;
586
587 b.interrupt_enable = 1;
588
589 if (!mce_flags.smca) {
590 new = (misc_high & MASK_LVTOFF_HI) >> 20;
591 goto set_offset;
592 }
593
594 /* Gather LVT offset for thresholding: */
595 if (rdmsr_safe(MSR_CU_DEF_ERR, &smca_low, &smca_high))
596 goto out;
597
598 new = (smca_low & SMCA_THR_LVT_OFF) >> 12;
599
600 set_offset:
601 offset = setup_APIC_mce_threshold(offset, new);
602 if (offset == new)
603 thresholding_irq_en = true;
604
605 done:
606 mce_threshold_block_init(&b, offset);
607
608 out:
609 return offset;
610 }
611
amd_filter_mce(struct mce * m)612 bool amd_filter_mce(struct mce *m)
613 {
614 enum smca_bank_types bank_type = smca_get_bank_type(m->extcpu, m->bank);
615 struct cpuinfo_x86 *c = &boot_cpu_data;
616
617 /* See Family 17h Models 10h-2Fh Erratum #1114. */
618 if (c->x86 == 0x17 &&
619 c->x86_model >= 0x10 && c->x86_model <= 0x2F &&
620 bank_type == SMCA_IF && XEC(m->status, 0x3f) == 10)
621 return true;
622
623 /* NB GART TLB error reporting is disabled by default. */
624 if (c->x86 < 0x17) {
625 if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5)
626 return true;
627 }
628
629 return false;
630 }
631
632 /*
633 * Turn off thresholding banks for the following conditions:
634 * - MC4_MISC thresholding is not supported on Family 0x15.
635 * - Prevent possible spurious interrupts from the IF bank on Family 0x17
636 * Models 0x10-0x2F due to Erratum #1114.
637 */
disable_err_thresholding(struct cpuinfo_x86 * c,unsigned int bank)638 static void disable_err_thresholding(struct cpuinfo_x86 *c, unsigned int bank)
639 {
640 int i, num_msrs;
641 u64 hwcr;
642 bool need_toggle;
643 u32 msrs[NR_BLOCKS];
644
645 if (c->x86 == 0x15 && bank == 4) {
646 msrs[0] = 0x00000413; /* MC4_MISC0 */
647 msrs[1] = 0xc0000408; /* MC4_MISC1 */
648 num_msrs = 2;
649 } else if (c->x86 == 0x17 &&
650 (c->x86_model >= 0x10 && c->x86_model <= 0x2F)) {
651
652 if (smca_get_bank_type(smp_processor_id(), bank) != SMCA_IF)
653 return;
654
655 msrs[0] = MSR_AMD64_SMCA_MCx_MISC(bank);
656 num_msrs = 1;
657 } else {
658 return;
659 }
660
661 rdmsrl(MSR_K7_HWCR, hwcr);
662
663 /* McStatusWrEn has to be set */
664 need_toggle = !(hwcr & BIT(18));
665 if (need_toggle)
666 wrmsrl(MSR_K7_HWCR, hwcr | BIT(18));
667
668 /* Clear CntP bit safely */
669 for (i = 0; i < num_msrs; i++)
670 msr_clear_bit(msrs[i], 62);
671
672 /* restore old settings */
673 if (need_toggle)
674 wrmsrl(MSR_K7_HWCR, hwcr);
675 }
676
677 /* cpu init entry point, called from mce.c with preempt off */
mce_amd_feature_init(struct cpuinfo_x86 * c)678 void mce_amd_feature_init(struct cpuinfo_x86 *c)
679 {
680 unsigned int bank, block, cpu = smp_processor_id();
681 u32 low = 0, high = 0, address = 0;
682 int offset = -1;
683
684
685 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) {
686 if (mce_flags.smca)
687 smca_configure(bank, cpu);
688
689 disable_err_thresholding(c, bank);
690
691 for (block = 0; block < NR_BLOCKS; ++block) {
692 address = get_block_address(address, low, high, bank, block, cpu);
693 if (!address)
694 break;
695
696 if (rdmsr_safe(address, &low, &high))
697 break;
698
699 if (!(high & MASK_VALID_HI))
700 continue;
701
702 if (!(high & MASK_CNTP_HI) ||
703 (high & MASK_LOCKED_HI))
704 continue;
705
706 offset = prepare_threshold_block(bank, block, address, offset, high);
707 }
708 }
709
710 if (mce_flags.succor)
711 deferred_error_interrupt_enable(c);
712 }
713
amd_mce_is_memory_error(struct mce * m)714 bool amd_mce_is_memory_error(struct mce *m)
715 {
716 /* ErrCodeExt[20:16] */
717 u8 xec = (m->status >> 16) & 0x1f;
718
719 if (mce_flags.smca)
720 return smca_get_bank_type(m->extcpu, m->bank) == SMCA_UMC && xec == 0x0;
721
722 return m->bank == 4 && xec == 0x8;
723 }
724
__log_error(unsigned int bank,u64 status,u64 addr,u64 misc)725 static void __log_error(unsigned int bank, u64 status, u64 addr, u64 misc)
726 {
727 struct mce m;
728
729 mce_setup(&m);
730
731 m.status = status;
732 m.misc = misc;
733 m.bank = bank;
734 m.tsc = rdtsc();
735
736 if (m.status & MCI_STATUS_ADDRV) {
737 m.addr = addr;
738
739 /*
740 * Extract [55:<lsb>] where lsb is the least significant
741 * *valid* bit of the address bits.
742 */
743 if (mce_flags.smca) {
744 u8 lsb = (m.addr >> 56) & 0x3f;
745
746 m.addr &= GENMASK_ULL(55, lsb);
747 }
748 }
749
750 if (mce_flags.smca) {
751 rdmsrl(MSR_AMD64_SMCA_MCx_IPID(bank), m.ipid);
752
753 if (m.status & MCI_STATUS_SYNDV)
754 rdmsrl(MSR_AMD64_SMCA_MCx_SYND(bank), m.synd);
755 }
756
757 mce_log(&m);
758 }
759
DEFINE_IDTENTRY_SYSVEC(sysvec_deferred_error)760 DEFINE_IDTENTRY_SYSVEC(sysvec_deferred_error)
761 {
762 trace_deferred_error_apic_entry(DEFERRED_ERROR_VECTOR);
763 inc_irq_stat(irq_deferred_error_count);
764 deferred_error_int_vector();
765 trace_deferred_error_apic_exit(DEFERRED_ERROR_VECTOR);
766 ack_APIC_irq();
767 }
768
769 /*
770 * Returns true if the logged error is deferred. False, otherwise.
771 */
772 static inline bool
_log_error_bank(unsigned int bank,u32 msr_stat,u32 msr_addr,u64 misc)773 _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc)
774 {
775 u64 status, addr = 0;
776
777 rdmsrl(msr_stat, status);
778 if (!(status & MCI_STATUS_VAL))
779 return false;
780
781 if (status & MCI_STATUS_ADDRV)
782 rdmsrl(msr_addr, addr);
783
784 __log_error(bank, status, addr, misc);
785
786 wrmsrl(msr_stat, 0);
787
788 return status & MCI_STATUS_DEFERRED;
789 }
790
_log_error_deferred(unsigned int bank,u32 misc)791 static bool _log_error_deferred(unsigned int bank, u32 misc)
792 {
793 if (!_log_error_bank(bank, mca_msr_reg(bank, MCA_STATUS),
794 mca_msr_reg(bank, MCA_ADDR), misc))
795 return false;
796
797 /*
798 * Non-SMCA systems don't have MCA_DESTAT/MCA_DEADDR registers.
799 * Return true here to avoid accessing these registers.
800 */
801 if (!mce_flags.smca)
802 return true;
803
804 /* Clear MCA_DESTAT if the deferred error was logged from MCA_STATUS. */
805 wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0);
806 return true;
807 }
808
809 /*
810 * We have three scenarios for checking for Deferred errors:
811 *
812 * 1) Non-SMCA systems check MCA_STATUS and log error if found.
813 * 2) SMCA systems check MCA_STATUS. If error is found then log it and also
814 * clear MCA_DESTAT.
815 * 3) SMCA systems check MCA_DESTAT, if error was not found in MCA_STATUS, and
816 * log it.
817 */
log_error_deferred(unsigned int bank)818 static void log_error_deferred(unsigned int bank)
819 {
820 if (_log_error_deferred(bank, 0))
821 return;
822
823 /*
824 * Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check
825 * for a valid error.
826 */
827 _log_error_bank(bank, MSR_AMD64_SMCA_MCx_DESTAT(bank),
828 MSR_AMD64_SMCA_MCx_DEADDR(bank), 0);
829 }
830
831 /* APIC interrupt handler for deferred errors */
amd_deferred_error_interrupt(void)832 static void amd_deferred_error_interrupt(void)
833 {
834 unsigned int bank;
835
836 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank)
837 log_error_deferred(bank);
838 }
839
log_error_thresholding(unsigned int bank,u64 misc)840 static void log_error_thresholding(unsigned int bank, u64 misc)
841 {
842 _log_error_deferred(bank, misc);
843 }
844
log_and_reset_block(struct threshold_block * block)845 static void log_and_reset_block(struct threshold_block *block)
846 {
847 struct thresh_restart tr;
848 u32 low = 0, high = 0;
849
850 if (!block)
851 return;
852
853 if (rdmsr_safe(block->address, &low, &high))
854 return;
855
856 if (!(high & MASK_OVERFLOW_HI))
857 return;
858
859 /* Log the MCE which caused the threshold event. */
860 log_error_thresholding(block->bank, ((u64)high << 32) | low);
861
862 /* Reset threshold block after logging error. */
863 memset(&tr, 0, sizeof(tr));
864 tr.b = block;
865 threshold_restart_bank(&tr);
866 }
867
868 /*
869 * Threshold interrupt handler will service THRESHOLD_APIC_VECTOR. The interrupt
870 * goes off when error_count reaches threshold_limit.
871 */
amd_threshold_interrupt(void)872 static void amd_threshold_interrupt(void)
873 {
874 struct threshold_block *first_block = NULL, *block = NULL, *tmp = NULL;
875 struct threshold_bank **bp = this_cpu_read(threshold_banks);
876 unsigned int bank, cpu = smp_processor_id();
877
878 /*
879 * Validate that the threshold bank has been initialized already. The
880 * handler is installed at boot time, but on a hotplug event the
881 * interrupt might fire before the data has been initialized.
882 */
883 if (!bp)
884 return;
885
886 for (bank = 0; bank < this_cpu_read(mce_num_banks); ++bank) {
887 if (!(per_cpu(bank_map, cpu) & (1 << bank)))
888 continue;
889
890 first_block = bp[bank]->blocks;
891 if (!first_block)
892 continue;
893
894 /*
895 * The first block is also the head of the list. Check it first
896 * before iterating over the rest.
897 */
898 log_and_reset_block(first_block);
899 list_for_each_entry_safe(block, tmp, &first_block->miscj, miscj)
900 log_and_reset_block(block);
901 }
902 }
903
904 /*
905 * Sysfs Interface
906 */
907
908 struct threshold_attr {
909 struct attribute attr;
910 ssize_t (*show) (struct threshold_block *, char *);
911 ssize_t (*store) (struct threshold_block *, const char *, size_t count);
912 };
913
914 #define SHOW_FIELDS(name) \
915 static ssize_t show_ ## name(struct threshold_block *b, char *buf) \
916 { \
917 return sprintf(buf, "%lu\n", (unsigned long) b->name); \
918 }
919 SHOW_FIELDS(interrupt_enable)
SHOW_FIELDS(threshold_limit)920 SHOW_FIELDS(threshold_limit)
921
922 static ssize_t
923 store_interrupt_enable(struct threshold_block *b, const char *buf, size_t size)
924 {
925 struct thresh_restart tr;
926 unsigned long new;
927
928 if (!b->interrupt_capable)
929 return -EINVAL;
930
931 if (kstrtoul(buf, 0, &new) < 0)
932 return -EINVAL;
933
934 b->interrupt_enable = !!new;
935
936 memset(&tr, 0, sizeof(tr));
937 tr.b = b;
938
939 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1))
940 return -ENODEV;
941
942 return size;
943 }
944
945 static ssize_t
store_threshold_limit(struct threshold_block * b,const char * buf,size_t size)946 store_threshold_limit(struct threshold_block *b, const char *buf, size_t size)
947 {
948 struct thresh_restart tr;
949 unsigned long new;
950
951 if (kstrtoul(buf, 0, &new) < 0)
952 return -EINVAL;
953
954 if (new > THRESHOLD_MAX)
955 new = THRESHOLD_MAX;
956 if (new < 1)
957 new = 1;
958
959 memset(&tr, 0, sizeof(tr));
960 tr.old_limit = b->threshold_limit;
961 b->threshold_limit = new;
962 tr.b = b;
963
964 if (smp_call_function_single(b->cpu, threshold_restart_bank, &tr, 1))
965 return -ENODEV;
966
967 return size;
968 }
969
show_error_count(struct threshold_block * b,char * buf)970 static ssize_t show_error_count(struct threshold_block *b, char *buf)
971 {
972 u32 lo, hi;
973
974 /* CPU might be offline by now */
975 if (rdmsr_on_cpu(b->cpu, b->address, &lo, &hi))
976 return -ENODEV;
977
978 return sprintf(buf, "%u\n", ((hi & THRESHOLD_MAX) -
979 (THRESHOLD_MAX - b->threshold_limit)));
980 }
981
982 static struct threshold_attr error_count = {
983 .attr = {.name = __stringify(error_count), .mode = 0444 },
984 .show = show_error_count,
985 };
986
987 #define RW_ATTR(val) \
988 static struct threshold_attr val = { \
989 .attr = {.name = __stringify(val), .mode = 0644 }, \
990 .show = show_## val, \
991 .store = store_## val, \
992 };
993
994 RW_ATTR(interrupt_enable);
995 RW_ATTR(threshold_limit);
996
997 static struct attribute *default_attrs[] = {
998 &threshold_limit.attr,
999 &error_count.attr,
1000 NULL, /* possibly interrupt_enable if supported, see below */
1001 NULL,
1002 };
1003 ATTRIBUTE_GROUPS(default);
1004
1005 #define to_block(k) container_of(k, struct threshold_block, kobj)
1006 #define to_attr(a) container_of(a, struct threshold_attr, attr)
1007
show(struct kobject * kobj,struct attribute * attr,char * buf)1008 static ssize_t show(struct kobject *kobj, struct attribute *attr, char *buf)
1009 {
1010 struct threshold_block *b = to_block(kobj);
1011 struct threshold_attr *a = to_attr(attr);
1012 ssize_t ret;
1013
1014 ret = a->show ? a->show(b, buf) : -EIO;
1015
1016 return ret;
1017 }
1018
store(struct kobject * kobj,struct attribute * attr,const char * buf,size_t count)1019 static ssize_t store(struct kobject *kobj, struct attribute *attr,
1020 const char *buf, size_t count)
1021 {
1022 struct threshold_block *b = to_block(kobj);
1023 struct threshold_attr *a = to_attr(attr);
1024 ssize_t ret;
1025
1026 ret = a->store ? a->store(b, buf, count) : -EIO;
1027
1028 return ret;
1029 }
1030
1031 static const struct sysfs_ops threshold_ops = {
1032 .show = show,
1033 .store = store,
1034 };
1035
1036 static void threshold_block_release(struct kobject *kobj);
1037
1038 static struct kobj_type threshold_ktype = {
1039 .sysfs_ops = &threshold_ops,
1040 .default_groups = default_groups,
1041 .release = threshold_block_release,
1042 };
1043
get_name(unsigned int cpu,unsigned int bank,struct threshold_block * b)1044 static const char *get_name(unsigned int cpu, unsigned int bank, struct threshold_block *b)
1045 {
1046 enum smca_bank_types bank_type;
1047
1048 if (!mce_flags.smca) {
1049 if (b && bank == 4)
1050 return bank4_names(b);
1051
1052 return th_names[bank];
1053 }
1054
1055 bank_type = smca_get_bank_type(cpu, bank);
1056 if (bank_type >= N_SMCA_BANK_TYPES)
1057 return NULL;
1058
1059 if (b && bank_type == SMCA_UMC) {
1060 if (b->block < ARRAY_SIZE(smca_umc_block_names))
1061 return smca_umc_block_names[b->block];
1062 return NULL;
1063 }
1064
1065 if (per_cpu(smca_bank_counts, cpu)[bank_type] == 1)
1066 return smca_get_name(bank_type);
1067
1068 snprintf(buf_mcatype, MAX_MCATYPE_NAME_LEN,
1069 "%s_%u", smca_get_name(bank_type),
1070 per_cpu(smca_banks, cpu)[bank].sysfs_id);
1071 return buf_mcatype;
1072 }
1073
allocate_threshold_blocks(unsigned int cpu,struct threshold_bank * tb,unsigned int bank,unsigned int block,u32 address)1074 static int allocate_threshold_blocks(unsigned int cpu, struct threshold_bank *tb,
1075 unsigned int bank, unsigned int block,
1076 u32 address)
1077 {
1078 struct threshold_block *b = NULL;
1079 u32 low, high;
1080 int err;
1081
1082 if ((bank >= this_cpu_read(mce_num_banks)) || (block >= NR_BLOCKS))
1083 return 0;
1084
1085 if (rdmsr_safe(address, &low, &high))
1086 return 0;
1087
1088 if (!(high & MASK_VALID_HI)) {
1089 if (block)
1090 goto recurse;
1091 else
1092 return 0;
1093 }
1094
1095 if (!(high & MASK_CNTP_HI) ||
1096 (high & MASK_LOCKED_HI))
1097 goto recurse;
1098
1099 b = kzalloc(sizeof(struct threshold_block), GFP_KERNEL);
1100 if (!b)
1101 return -ENOMEM;
1102
1103 b->block = block;
1104 b->bank = bank;
1105 b->cpu = cpu;
1106 b->address = address;
1107 b->interrupt_enable = 0;
1108 b->interrupt_capable = lvt_interrupt_supported(bank, high);
1109 b->threshold_limit = THRESHOLD_MAX;
1110
1111 if (b->interrupt_capable) {
1112 default_attrs[2] = &interrupt_enable.attr;
1113 b->interrupt_enable = 1;
1114 } else {
1115 default_attrs[2] = NULL;
1116 }
1117
1118 INIT_LIST_HEAD(&b->miscj);
1119
1120 /* This is safe as @tb is not visible yet */
1121 if (tb->blocks)
1122 list_add(&b->miscj, &tb->blocks->miscj);
1123 else
1124 tb->blocks = b;
1125
1126 err = kobject_init_and_add(&b->kobj, &threshold_ktype, tb->kobj, get_name(cpu, bank, b));
1127 if (err)
1128 goto out_free;
1129 recurse:
1130 address = get_block_address(address, low, high, bank, ++block, cpu);
1131 if (!address)
1132 return 0;
1133
1134 err = allocate_threshold_blocks(cpu, tb, bank, block, address);
1135 if (err)
1136 goto out_free;
1137
1138 if (b)
1139 kobject_uevent(&b->kobj, KOBJ_ADD);
1140
1141 return 0;
1142
1143 out_free:
1144 if (b) {
1145 list_del(&b->miscj);
1146 kobject_put(&b->kobj);
1147 }
1148 return err;
1149 }
1150
__threshold_add_blocks(struct threshold_bank * b)1151 static int __threshold_add_blocks(struct threshold_bank *b)
1152 {
1153 struct list_head *head = &b->blocks->miscj;
1154 struct threshold_block *pos = NULL;
1155 struct threshold_block *tmp = NULL;
1156 int err = 0;
1157
1158 err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name);
1159 if (err)
1160 return err;
1161
1162 list_for_each_entry_safe(pos, tmp, head, miscj) {
1163
1164 err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name);
1165 if (err) {
1166 list_for_each_entry_safe_reverse(pos, tmp, head, miscj)
1167 kobject_del(&pos->kobj);
1168
1169 return err;
1170 }
1171 }
1172 return err;
1173 }
1174
threshold_create_bank(struct threshold_bank ** bp,unsigned int cpu,unsigned int bank)1175 static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu,
1176 unsigned int bank)
1177 {
1178 struct device *dev = this_cpu_read(mce_device);
1179 struct amd_northbridge *nb = NULL;
1180 struct threshold_bank *b = NULL;
1181 const char *name = get_name(cpu, bank, NULL);
1182 int err = 0;
1183
1184 if (!dev)
1185 return -ENODEV;
1186
1187 if (is_shared_bank(bank)) {
1188 nb = node_to_amd_nb(topology_die_id(cpu));
1189
1190 /* threshold descriptor already initialized on this node? */
1191 if (nb && nb->bank4) {
1192 /* yes, use it */
1193 b = nb->bank4;
1194 err = kobject_add(b->kobj, &dev->kobj, name);
1195 if (err)
1196 goto out;
1197
1198 bp[bank] = b;
1199 refcount_inc(&b->cpus);
1200
1201 err = __threshold_add_blocks(b);
1202
1203 goto out;
1204 }
1205 }
1206
1207 b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
1208 if (!b) {
1209 err = -ENOMEM;
1210 goto out;
1211 }
1212
1213 /* Associate the bank with the per-CPU MCE device */
1214 b->kobj = kobject_create_and_add(name, &dev->kobj);
1215 if (!b->kobj) {
1216 err = -EINVAL;
1217 goto out_free;
1218 }
1219
1220 if (is_shared_bank(bank)) {
1221 b->shared = 1;
1222 refcount_set(&b->cpus, 1);
1223
1224 /* nb is already initialized, see above */
1225 if (nb) {
1226 WARN_ON(nb->bank4);
1227 nb->bank4 = b;
1228 }
1229 }
1230
1231 err = allocate_threshold_blocks(cpu, b, bank, 0, mca_msr_reg(bank, MCA_MISC));
1232 if (err)
1233 goto out_kobj;
1234
1235 bp[bank] = b;
1236 return 0;
1237
1238 out_kobj:
1239 kobject_put(b->kobj);
1240 out_free:
1241 kfree(b);
1242 out:
1243 return err;
1244 }
1245
threshold_block_release(struct kobject * kobj)1246 static void threshold_block_release(struct kobject *kobj)
1247 {
1248 kfree(to_block(kobj));
1249 }
1250
deallocate_threshold_blocks(struct threshold_bank * bank)1251 static void deallocate_threshold_blocks(struct threshold_bank *bank)
1252 {
1253 struct threshold_block *pos, *tmp;
1254
1255 list_for_each_entry_safe(pos, tmp, &bank->blocks->miscj, miscj) {
1256 list_del(&pos->miscj);
1257 kobject_put(&pos->kobj);
1258 }
1259
1260 kobject_put(&bank->blocks->kobj);
1261 }
1262
__threshold_remove_blocks(struct threshold_bank * b)1263 static void __threshold_remove_blocks(struct threshold_bank *b)
1264 {
1265 struct threshold_block *pos = NULL;
1266 struct threshold_block *tmp = NULL;
1267
1268 kobject_del(b->kobj);
1269
1270 list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj)
1271 kobject_del(&pos->kobj);
1272 }
1273
threshold_remove_bank(struct threshold_bank * bank)1274 static void threshold_remove_bank(struct threshold_bank *bank)
1275 {
1276 struct amd_northbridge *nb;
1277
1278 if (!bank->blocks)
1279 goto out_free;
1280
1281 if (!bank->shared)
1282 goto out_dealloc;
1283
1284 if (!refcount_dec_and_test(&bank->cpus)) {
1285 __threshold_remove_blocks(bank);
1286 return;
1287 } else {
1288 /*
1289 * The last CPU on this node using the shared bank is going
1290 * away, remove that bank now.
1291 */
1292 nb = node_to_amd_nb(topology_die_id(smp_processor_id()));
1293 nb->bank4 = NULL;
1294 }
1295
1296 out_dealloc:
1297 deallocate_threshold_blocks(bank);
1298
1299 out_free:
1300 kobject_put(bank->kobj);
1301 kfree(bank);
1302 }
1303
__threshold_remove_device(struct threshold_bank ** bp)1304 static void __threshold_remove_device(struct threshold_bank **bp)
1305 {
1306 unsigned int bank, numbanks = this_cpu_read(mce_num_banks);
1307
1308 for (bank = 0; bank < numbanks; bank++) {
1309 if (!bp[bank])
1310 continue;
1311
1312 threshold_remove_bank(bp[bank]);
1313 bp[bank] = NULL;
1314 }
1315 kfree(bp);
1316 }
1317
mce_threshold_remove_device(unsigned int cpu)1318 int mce_threshold_remove_device(unsigned int cpu)
1319 {
1320 struct threshold_bank **bp = this_cpu_read(threshold_banks);
1321
1322 if (!bp)
1323 return 0;
1324
1325 /*
1326 * Clear the pointer before cleaning up, so that the interrupt won't
1327 * touch anything of this.
1328 */
1329 this_cpu_write(threshold_banks, NULL);
1330
1331 __threshold_remove_device(bp);
1332 return 0;
1333 }
1334
1335 /**
1336 * mce_threshold_create_device - Create the per-CPU MCE threshold device
1337 * @cpu: The plugged in CPU
1338 *
1339 * Create directories and files for all valid threshold banks.
1340 *
1341 * This is invoked from the CPU hotplug callback which was installed in
1342 * mcheck_init_device(). The invocation happens in context of the hotplug
1343 * thread running on @cpu. The callback is invoked on all CPUs which are
1344 * online when the callback is installed or during a real hotplug event.
1345 */
mce_threshold_create_device(unsigned int cpu)1346 int mce_threshold_create_device(unsigned int cpu)
1347 {
1348 unsigned int numbanks, bank;
1349 struct threshold_bank **bp;
1350 int err;
1351
1352 if (!mce_flags.amd_threshold)
1353 return 0;
1354
1355 bp = this_cpu_read(threshold_banks);
1356 if (bp)
1357 return 0;
1358
1359 numbanks = this_cpu_read(mce_num_banks);
1360 bp = kcalloc(numbanks, sizeof(*bp), GFP_KERNEL);
1361 if (!bp)
1362 return -ENOMEM;
1363
1364 for (bank = 0; bank < numbanks; ++bank) {
1365 if (!(this_cpu_read(bank_map) & (1 << bank)))
1366 continue;
1367 err = threshold_create_bank(bp, cpu, bank);
1368 if (err) {
1369 __threshold_remove_device(bp);
1370 return err;
1371 }
1372 }
1373 this_cpu_write(threshold_banks, bp);
1374
1375 if (thresholding_irq_en)
1376 mce_threshold_vector = amd_threshold_interrupt;
1377 return 0;
1378 }
1379