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linux-brain/arch/mips/mm/cerr-sb1.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2001,2002,2003 Broadcom Corporation
*/
#include <linux/sched.h>
#include <asm/mipsregs.h>
#include <asm/sibyte/sb1250.h>
#include <asm/sibyte/sb1250_regs.h>
#if !defined(CONFIG_SIBYTE_BUS_WATCHER) || defined(CONFIG_SIBYTE_BW_TRACE)
#include <asm/io.h>
#include <asm/sibyte/sb1250_scd.h>
#endif
/*
* We'd like to dump the L2_ECC_TAG register on errors, but errata make
* that unsafe... So for now we don't. (BCM1250/BCM112x erratum SOC-48.)
*/
#undef DUMP_L2_ECC_TAG_ON_ERROR
/* SB1 definitions */
/* XXX should come from config1 XXX */
#define SB1_CACHE_INDEX_MASK 0x1fe0
#define CP0_ERRCTL_RECOVERABLE (1 << 31)
#define CP0_ERRCTL_DCACHE (1 << 30)
#define CP0_ERRCTL_ICACHE (1 << 29)
#define CP0_ERRCTL_MULTIBUS (1 << 23)
#define CP0_ERRCTL_MC_TLB (1 << 15)
#define CP0_ERRCTL_MC_TIMEOUT (1 << 14)
#define CP0_CERRI_TAG_PARITY (1 << 29)
#define CP0_CERRI_DATA_PARITY (1 << 28)
#define CP0_CERRI_EXTERNAL (1 << 26)
#define CP0_CERRI_IDX_VALID(c) (!((c) & CP0_CERRI_EXTERNAL))
#define CP0_CERRI_DATA (CP0_CERRI_DATA_PARITY)
#define CP0_CERRD_MULTIPLE (1 << 31)
#define CP0_CERRD_TAG_STATE (1 << 30)
#define CP0_CERRD_TAG_ADDRESS (1 << 29)
#define CP0_CERRD_DATA_SBE (1 << 28)
#define CP0_CERRD_DATA_DBE (1 << 27)
#define CP0_CERRD_EXTERNAL (1 << 26)
#define CP0_CERRD_LOAD (1 << 25)
#define CP0_CERRD_STORE (1 << 24)
#define CP0_CERRD_FILLWB (1 << 23)
#define CP0_CERRD_COHERENCY (1 << 22)
#define CP0_CERRD_DUPTAG (1 << 21)
#define CP0_CERRD_DPA_VALID(c) (!((c) & CP0_CERRD_EXTERNAL))
#define CP0_CERRD_IDX_VALID(c) \
(((c) & (CP0_CERRD_LOAD | CP0_CERRD_STORE)) ? (!((c) & CP0_CERRD_EXTERNAL)) : 0)
#define CP0_CERRD_CAUSES \
(CP0_CERRD_LOAD | CP0_CERRD_STORE | CP0_CERRD_FILLWB | CP0_CERRD_COHERENCY | CP0_CERRD_DUPTAG)
#define CP0_CERRD_TYPES \
(CP0_CERRD_TAG_STATE | CP0_CERRD_TAG_ADDRESS | CP0_CERRD_DATA_SBE | CP0_CERRD_DATA_DBE | CP0_CERRD_EXTERNAL)
#define CP0_CERRD_DATA (CP0_CERRD_DATA_SBE | CP0_CERRD_DATA_DBE)
static uint32_t extract_ic(unsigned short addr, int data);
static uint32_t extract_dc(unsigned short addr, int data);
static inline void breakout_errctl(unsigned int val)
{
if (val & CP0_ERRCTL_RECOVERABLE)
printk(" recoverable");
if (val & CP0_ERRCTL_DCACHE)
printk(" dcache");
if (val & CP0_ERRCTL_ICACHE)
printk(" icache");
if (val & CP0_ERRCTL_MULTIBUS)
printk(" multiple-buserr");
printk("\n");
}
static inline void breakout_cerri(unsigned int val)
{
if (val & CP0_CERRI_TAG_PARITY)
printk(" tag-parity");
if (val & CP0_CERRI_DATA_PARITY)
printk(" data-parity");
if (val & CP0_CERRI_EXTERNAL)
printk(" external");
printk("\n");
}
static inline void breakout_cerrd(unsigned int val)
{
switch (val & CP0_CERRD_CAUSES) {
case CP0_CERRD_LOAD:
printk(" load,");
break;
case CP0_CERRD_STORE:
printk(" store,");
break;
case CP0_CERRD_FILLWB:
printk(" fill/wb,");
break;
case CP0_CERRD_COHERENCY:
printk(" coherency,");
break;
case CP0_CERRD_DUPTAG:
printk(" duptags,");
break;
default:
printk(" NO CAUSE,");
break;
}
if (!(val & CP0_CERRD_TYPES))
printk(" NO TYPE");
else {
if (val & CP0_CERRD_MULTIPLE)
printk(" multi-err");
if (val & CP0_CERRD_TAG_STATE)
printk(" tag-state");
if (val & CP0_CERRD_TAG_ADDRESS)
printk(" tag-address");
if (val & CP0_CERRD_DATA_SBE)
printk(" data-SBE");
if (val & CP0_CERRD_DATA_DBE)
printk(" data-DBE");
if (val & CP0_CERRD_EXTERNAL)
printk(" external");
}
printk("\n");
}
#ifndef CONFIG_SIBYTE_BUS_WATCHER
static void check_bus_watcher(void)
{
uint32_t status, l2_err, memio_err;
#ifdef DUMP_L2_ECC_TAG_ON_ERROR
uint64_t l2_tag;
#endif
/* Destructive read, clears register and interrupt */
status = csr_in32(IOADDR(A_SCD_BUS_ERR_STATUS));
/* Bit 31 is always on, but there's no #define for that */
if (status & ~(1UL << 31)) {
l2_err = csr_in32(IOADDR(A_BUS_L2_ERRORS));
#ifdef DUMP_L2_ECC_TAG_ON_ERROR
l2_tag = in64(IOADDR(A_L2_ECC_TAG));
#endif
memio_err = csr_in32(IOADDR(A_BUS_MEM_IO_ERRORS));
printk("Bus watcher error counters: %08x %08x\n", l2_err, memio_err);
printk("\nLast recorded signature:\n");
printk("Request %02x from %d, answered by %d with Dcode %d\n",
(unsigned int)(G_SCD_BERR_TID(status) & 0x3f),
(int)(G_SCD_BERR_TID(status) >> 6),
(int)G_SCD_BERR_RID(status),
(int)G_SCD_BERR_DCODE(status));
#ifdef DUMP_L2_ECC_TAG_ON_ERROR
printk("Last L2 tag w/ bad ECC: %016llx\n", l2_tag);
#endif
} else {
printk("Bus watcher indicates no error\n");
}
}
#else
extern void check_bus_watcher(void);
#endif
asmlinkage void sb1_cache_error(void)
{
uint32_t errctl, cerr_i, cerr_d, dpalo, dpahi, eepc, res;
unsigned long long cerr_dpa;
#ifdef CONFIG_SIBYTE_BW_TRACE
/* Freeze the trace buffer now */
csr_out32(M_SCD_TRACE_CFG_FREEZE, IOADDR(A_SCD_TRACE_CFG));
printk("Trace buffer frozen\n");
#endif
printk("Cache error exception on CPU %x:\n",
(read_c0_prid() >> 25) & 0x7);
__asm__ __volatile__ (
" .set push\n\t"
" .set mips64\n\t"
" .set noat\n\t"
" mfc0 %0, $26\n\t"
" mfc0 %1, $27\n\t"
" mfc0 %2, $27, 1\n\t"
" dmfc0 $1, $27, 3\n\t"
" dsrl32 %3, $1, 0 \n\t"
" sll %4, $1, 0 \n\t"
" mfc0 %5, $30\n\t"
" .set pop"
: "=r" (errctl), "=r" (cerr_i), "=r" (cerr_d),
"=r" (dpahi), "=r" (dpalo), "=r" (eepc));
cerr_dpa = (((uint64_t)dpahi) << 32) | dpalo;
printk(" c0_errorepc == %08x\n", eepc);
printk(" c0_errctl == %08x", errctl);
breakout_errctl(errctl);
if (errctl & CP0_ERRCTL_ICACHE) {
printk(" c0_cerr_i == %08x", cerr_i);
breakout_cerri(cerr_i);
if (CP0_CERRI_IDX_VALID(cerr_i)) {
/* Check index of EPC, allowing for delay slot */
if (((eepc & SB1_CACHE_INDEX_MASK) != (cerr_i & SB1_CACHE_INDEX_MASK)) &&
((eepc & SB1_CACHE_INDEX_MASK) != ((cerr_i & SB1_CACHE_INDEX_MASK) - 4)))
printk(" cerr_i idx doesn't match eepc\n");
else {
res = extract_ic(cerr_i & SB1_CACHE_INDEX_MASK,
(cerr_i & CP0_CERRI_DATA) != 0);
if (!(res & cerr_i))
printk("...didn't see indicated icache problem\n");
}
}
}
if (errctl & CP0_ERRCTL_DCACHE) {
printk(" c0_cerr_d == %08x", cerr_d);
breakout_cerrd(cerr_d);
if (CP0_CERRD_DPA_VALID(cerr_d)) {
printk(" c0_cerr_dpa == %010llx\n", cerr_dpa);
if (!CP0_CERRD_IDX_VALID(cerr_d)) {
res = extract_dc(cerr_dpa & SB1_CACHE_INDEX_MASK,
(cerr_d & CP0_CERRD_DATA) != 0);
if (!(res & cerr_d))
printk("...didn't see indicated dcache problem\n");
} else {
if ((cerr_dpa & SB1_CACHE_INDEX_MASK) != (cerr_d & SB1_CACHE_INDEX_MASK))
printk(" cerr_d idx doesn't match cerr_dpa\n");
else {
res = extract_dc(cerr_d & SB1_CACHE_INDEX_MASK,
(cerr_d & CP0_CERRD_DATA) != 0);
if (!(res & cerr_d))
printk("...didn't see indicated problem\n");
}
}
}
}
check_bus_watcher();
/*
* Calling panic() when a fatal cache error occurs scrambles the
* state of the system (and the cache), making it difficult to
* investigate after the fact. However, if you just stall the CPU,
* the other CPU may keep on running, which is typically very
* undesirable.
*/
#ifdef CONFIG_SB1_CERR_STALL
while (1)
;
#else
panic("unhandled cache error");
#endif
}
/* Parity lookup table. */
static const uint8_t parity[256] = {
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0
};
/* Masks to select bits for Hamming parity, mask_72_64[i] for bit[i] */
static const uint64_t mask_72_64[8] = {
0x0738C808099264FFULL,
0x38C808099264FF07ULL,
0xC808099264FF0738ULL,
0x08099264FF0738C8ULL,
0x099264FF0738C808ULL,
0x9264FF0738C80809ULL,
0x64FF0738C8080992ULL,
0xFF0738C808099264ULL
};
/* Calculate the parity on a range of bits */
static char range_parity(uint64_t dword, int max, int min)
{
char parity = 0;
int i;
dword >>= min;
for (i=max-min; i>=0; i--) {
if (dword & 0x1)
parity = !parity;
dword >>= 1;
}
return parity;
}
/* Calculate the 4-bit even byte-parity for an instruction */
static unsigned char inst_parity(uint32_t word)
{
int i, j;
char parity = 0;
for (j=0; j<4; j++) {
char byte_parity = 0;
for (i=0; i<8; i++) {
if (word & 0x80000000)
byte_parity = !byte_parity;
word <<= 1;
}
parity <<= 1;
parity |= byte_parity;
}
return parity;
}
static uint32_t extract_ic(unsigned short addr, int data)
{
unsigned short way;
int valid;
uint32_t taghi, taglolo, taglohi;
unsigned long long taglo, va;
uint64_t tlo_tmp;
uint8_t lru;
int res = 0;
printk("Icache index 0x%04x ", addr);
for (way = 0; way < 4; way++) {
/* Index-load-tag-I */
__asm__ __volatile__ (
" .set push \n\t"
" .set noreorder \n\t"
" .set mips64 \n\t"
" .set noat \n\t"
" cache 4, 0(%3) \n\t"
" mfc0 %0, $29 \n\t"
" dmfc0 $1, $28 \n\t"
" dsrl32 %1, $1, 0 \n\t"
" sll %2, $1, 0 \n\t"
" .set pop"
: "=r" (taghi), "=r" (taglohi), "=r" (taglolo)
: "r" ((way << 13) | addr));
taglo = ((unsigned long long)taglohi << 32) | taglolo;
if (way == 0) {
lru = (taghi >> 14) & 0xff;
printk("[Bank %d Set 0x%02x] LRU > %d %d %d %d > MRU\n",
((addr >> 5) & 0x3), /* bank */
((addr >> 7) & 0x3f), /* index */
(lru & 0x3),
((lru >> 2) & 0x3),
((lru >> 4) & 0x3),
((lru >> 6) & 0x3));
}
va = (taglo & 0xC0000FFFFFFFE000ULL) | addr;
if ((taglo & (1 << 31)) && (((taglo >> 62) & 0x3) == 3))
va |= 0x3FFFF00000000000ULL;
valid = ((taghi >> 29) & 1);
if (valid) {
tlo_tmp = taglo & 0xfff3ff;
if (((taglo >> 10) & 1) ^ range_parity(tlo_tmp, 23, 0)) {
printk(" ** bad parity in VTag0/G/ASID\n");
res |= CP0_CERRI_TAG_PARITY;
}
if (((taglo >> 11) & 1) ^ range_parity(taglo, 63, 24)) {
printk(" ** bad parity in R/VTag1\n");
res |= CP0_CERRI_TAG_PARITY;
}
}
if (valid ^ ((taghi >> 27) & 1)) {
printk(" ** bad parity for valid bit\n");
res |= CP0_CERRI_TAG_PARITY;
}
printk(" %d [VA %016llx] [Vld? %d] raw tags: %08X-%016llX\n",
way, va, valid, taghi, taglo);
if (data) {
uint32_t datahi, insta, instb;
uint8_t predecode;
int offset;
/* (hit all banks and ways) */
for (offset = 0; offset < 4; offset++) {
/* Index-load-data-I */
__asm__ __volatile__ (
" .set push\n\t"
" .set noreorder\n\t"
" .set mips64\n\t"
" .set noat\n\t"
" cache 6, 0(%3) \n\t"
" mfc0 %0, $29, 1\n\t"
" dmfc0 $1, $28, 1\n\t"
" dsrl32 %1, $1, 0 \n\t"
" sll %2, $1, 0 \n\t"
" .set pop \n"
: "=r" (datahi), "=r" (insta), "=r" (instb)
: "r" ((way << 13) | addr | (offset << 3)));
predecode = (datahi >> 8) & 0xff;
if (((datahi >> 16) & 1) != (uint32_t)range_parity(predecode, 7, 0)) {
printk(" ** bad parity in predecode\n");
res |= CP0_CERRI_DATA_PARITY;
}
/* XXXKW should/could check predecode bits themselves */
if (((datahi >> 4) & 0xf) ^ inst_parity(insta)) {
printk(" ** bad parity in instruction a\n");
res |= CP0_CERRI_DATA_PARITY;
}
if ((datahi & 0xf) ^ inst_parity(instb)) {
printk(" ** bad parity in instruction b\n");
res |= CP0_CERRI_DATA_PARITY;
}
printk(" %05X-%08X%08X", datahi, insta, instb);
}
printk("\n");
}
}
return res;
}
/* Compute the ECC for a data doubleword */
static uint8_t dc_ecc(uint64_t dword)
{
uint64_t t;
uint32_t w;
uint8_t p;
int i;
p = 0;
for (i = 7; i >= 0; i--)
{
p <<= 1;
t = dword & mask_72_64[i];
w = (uint32_t)(t >> 32);
p ^= (parity[w>>24] ^ parity[(w>>16) & 0xFF]
^ parity[(w>>8) & 0xFF] ^ parity[w & 0xFF]);
w = (uint32_t)(t & 0xFFFFFFFF);
p ^= (parity[w>>24] ^ parity[(w>>16) & 0xFF]
^ parity[(w>>8) & 0xFF] ^ parity[w & 0xFF]);
}
return p;
}
struct dc_state {
unsigned char val;
char *name;
};
static struct dc_state dc_states[] = {
{ 0x00, "INVALID" },
{ 0x0f, "COH-SHD" },
{ 0x13, "NCO-E-C" },
{ 0x19, "NCO-E-D" },
{ 0x16, "COH-E-C" },
{ 0x1c, "COH-E-D" },
{ 0xff, "*ERROR*" }
};
#define DC_TAG_VALID(state) \
(((state) == 0x0) || ((state) == 0xf) || ((state) == 0x13) || \
((state) == 0x19) || ((state) == 0x16) || ((state) == 0x1c))
static char *dc_state_str(unsigned char state)
{
struct dc_state *dsc = dc_states;
while (dsc->val != 0xff) {
if (dsc->val == state)
break;
dsc++;
}
return dsc->name;
}
static uint32_t extract_dc(unsigned short addr, int data)
{
int valid, way;
unsigned char state;
uint32_t taghi, taglolo, taglohi;
unsigned long long taglo, pa;
uint8_t ecc, lru;
int res = 0;
printk("Dcache index 0x%04x ", addr);
for (way = 0; way < 4; way++) {
__asm__ __volatile__ (
" .set push\n\t"
" .set noreorder\n\t"
" .set mips64\n\t"
" .set noat\n\t"
" cache 5, 0(%3)\n\t" /* Index-load-tag-D */
" mfc0 %0, $29, 2\n\t"
" dmfc0 $1, $28, 2\n\t"
" dsrl32 %1, $1, 0\n\t"
" sll %2, $1, 0\n\t"
" .set pop"
: "=r" (taghi), "=r" (taglohi), "=r" (taglolo)
: "r" ((way << 13) | addr));
taglo = ((unsigned long long)taglohi << 32) | taglolo;
pa = (taglo & 0xFFFFFFE000ULL) | addr;
if (way == 0) {
lru = (taghi >> 14) & 0xff;
printk("[Bank %d Set 0x%02x] LRU > %d %d %d %d > MRU\n",
((addr >> 11) & 0x2) | ((addr >> 5) & 1), /* bank */
((addr >> 6) & 0x3f), /* index */
(lru & 0x3),
((lru >> 2) & 0x3),
((lru >> 4) & 0x3),
((lru >> 6) & 0x3));
}
state = (taghi >> 25) & 0x1f;
valid = DC_TAG_VALID(state);
printk(" %d [PA %010llx] [state %s (%02x)] raw tags: %08X-%016llX\n",
way, pa, dc_state_str(state), state, taghi, taglo);
if (valid) {
if (((taglo >> 11) & 1) ^ range_parity(taglo, 39, 26)) {
printk(" ** bad parity in PTag1\n");
res |= CP0_CERRD_TAG_ADDRESS;
}
if (((taglo >> 10) & 1) ^ range_parity(taglo, 25, 13)) {
printk(" ** bad parity in PTag0\n");
res |= CP0_CERRD_TAG_ADDRESS;
}
} else {
res |= CP0_CERRD_TAG_STATE;
}
if (data) {
uint32_t datalohi, datalolo, datahi;
unsigned long long datalo;
int offset;
char bad_ecc = 0;
for (offset = 0; offset < 4; offset++) {
/* Index-load-data-D */
__asm__ __volatile__ (
" .set push\n\t"
" .set noreorder\n\t"
" .set mips64\n\t"
" .set noat\n\t"
" cache 7, 0(%3)\n\t" /* Index-load-data-D */
" mfc0 %0, $29, 3\n\t"
" dmfc0 $1, $28, 3\n\t"
" dsrl32 %1, $1, 0 \n\t"
" sll %2, $1, 0 \n\t"
" .set pop"
: "=r" (datahi), "=r" (datalohi), "=r" (datalolo)
: "r" ((way << 13) | addr | (offset << 3)));
datalo = ((unsigned long long)datalohi << 32) | datalolo;
ecc = dc_ecc(datalo);
if (ecc != datahi) {
int bits;
bad_ecc |= 1 << (3-offset);
ecc ^= datahi;
bits = hweight8(ecc);
res |= (bits == 1) ? CP0_CERRD_DATA_SBE : CP0_CERRD_DATA_DBE;
}
printk(" %02X-%016llX", datahi, datalo);
}
printk("\n");
if (bad_ecc)
printk(" dwords w/ bad ECC: %d %d %d %d\n",
!!(bad_ecc & 8), !!(bad_ecc & 4),
!!(bad_ecc & 2), !!(bad_ecc & 1));
}
}
return res;
}
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