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drm/amdgpu: Add RAS EEPROM table.

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Add RAS EEPROM table manager to eanble RAS errors to be stored
upon appearance and retrived on driver load.

v2: Fix some prints.

v3:
Fix checksum calculation.
Make table record and header structs packed to do correct byte value sum.
Fix record crossing EEPROM page boundry.

v4:
Fix byte sum val calculation for record - look at sizeof(record).
Fix some style comments.

v5: Add description to EEPROM_TABLE_RECORD_SIZE and syntax fixes.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Luben Tuikov <Luben.Tuikov@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Andrey Grodzovsky 2019-05-30 11:01:26 -04:00 committed by Alex Deucher
parent 250af743c0
commit 64f55e6292
4 changed files with 586 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/amd/amdgpu/Makefile
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@ -54,7 +54,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
amdgpu_gtt_mgr.o amdgpu_vram_mgr.o amdgpu_virt.o amdgpu_atomfirmware.o \
amdgpu_vf_error.o amdgpu_sched.o amdgpu_debugfs.o amdgpu_ids.o \
amdgpu_gmc.o amdgpu_xgmi.o amdgpu_csa.o amdgpu_ras.o amdgpu_vm_cpu.o \
amdgpu_vm_sdma.o amdgpu_discovery.o
amdgpu_vm_sdma.o amdgpu_pmu.o amdgpu_discovery.o amdgpu_ras_eeprom.o
amdgpu-$(CONFIG_PERF_EVENTS) += amdgpu_pmu.o

3
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
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@ -29,6 +29,7 @@
#include "amdgpu.h"
#include "amdgpu_psp.h"
#include "ta_ras_if.h"
#include "amdgpu_ras_eeprom.h"
enum amdgpu_ras_block {
AMDGPU_RAS_BLOCK__UMC = 0,
@ -333,6 +334,8 @@ struct amdgpu_ras {
struct mutex recovery_lock;
uint32_t flags;
struct amdgpu_ras_eeprom_control eeprom_control;
};
struct ras_fs_data {

492
drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c Normal file
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@ -0,0 +1,492 @@
/*
* Copyright 2019 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#include "amdgpu_ras_eeprom.h"
#include "amdgpu.h"
#include "amdgpu_ras.h"
#include <linux/bits.h>
#define EEPROM_I2C_TARGET_ADDR 0xA0
/*
* The 2 macros bellow represent the actual size in bytes that
* those entities occupy in the EEPROM memory.
* EEPROM_TABLE_RECORD_SIZE is different than sizeof(eeprom_table_record) which
* uses uint64 to store 6b fields such as retired_page.
*/
#define EEPROM_TABLE_HEADER_SIZE 20
#define EEPROM_TABLE_RECORD_SIZE 24
#define EEPROM_ADDRESS_SIZE 0x2
/* Table hdr is 'AMDR' */
#define EEPROM_TABLE_HDR_VAL 0x414d4452
#define EEPROM_TABLE_VER 0x00010000
/* Assume 2 Mbit size */
#define EEPROM_SIZE_BYTES 256000
#define EEPROM_PAGE__SIZE_BYTES 256
#define EEPROM_HDR_START 0
#define EEPROM_RECORD_START (EEPROM_HDR_START + EEPROM_TABLE_HEADER_SIZE)
#define EEPROM_MAX_RECORD_NUM ((EEPROM_SIZE_BYTES - EEPROM_TABLE_HEADER_SIZE) / EEPROM_TABLE_RECORD_SIZE)
#define EEPROM_ADDR_MSB_MASK GENMASK(17, 8)
#define to_amdgpu_device(x) (container_of(x, struct amdgpu_ras, eeprom_control))->adev
static void __encode_table_header_to_buff(struct amdgpu_ras_eeprom_table_header *hdr,
unsigned char *buff)
{
uint32_t *pp = (uint32_t *) buff;
pp[0] = cpu_to_le32(hdr->header);
pp[1] = cpu_to_le32(hdr->version);
pp[2] = cpu_to_le32(hdr->first_rec_offset);
pp[3] = cpu_to_le32(hdr->tbl_size);
pp[4] = cpu_to_le32(hdr->checksum);
}
static void __decode_table_header_from_buff(struct amdgpu_ras_eeprom_table_header *hdr,
unsigned char *buff)
{
uint32_t *pp = (uint32_t *)buff;
hdr->header = le32_to_cpu(pp[0]);
hdr->version = le32_to_cpu(pp[1]);
hdr->first_rec_offset = le32_to_cpu(pp[2]);
hdr->tbl_size = le32_to_cpu(pp[3]);
hdr->checksum = le32_to_cpu(pp[4]);
}
static int __update_table_header(struct amdgpu_ras_eeprom_control *control,
unsigned char *buff)
{
int ret = 0;
struct i2c_msg msg = {
.addr = EEPROM_I2C_TARGET_ADDR,
.flags = 0,
.len = EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE,
.buf = buff,
};
*(uint16_t *)buff = EEPROM_HDR_START;
__encode_table_header_to_buff(&control->tbl_hdr, buff + EEPROM_ADDRESS_SIZE);
ret = i2c_transfer(&control->eeprom_accessor, &msg, 1);
if (ret < 1)
DRM_ERROR("Failed to write EEPROM table header, ret:%d", ret);
return ret;
}
static uint32_t __calc_hdr_byte_sum(struct amdgpu_ras_eeprom_control *control);
int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control)
{
int ret = 0;
struct amdgpu_device *adev = to_amdgpu_device(control);
unsigned char buff[EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE] = { 0 };
struct amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr;
struct i2c_msg msg = {
.addr = EEPROM_I2C_TARGET_ADDR,
.flags = I2C_M_RD,
.len = EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE,
.buf = buff,
};
mutex_init(&control->tbl_mutex);
switch (adev->asic_type) {
case CHIP_VEGA20:
/*TODO Add MI-60 */
break;
default:
return 0;
}
if (ret) {
DRM_ERROR("Failed to init I2C controller, ret:%d", ret);
return ret;
}
/* Read/Create table header from EEPROM address 0 */
ret = i2c_transfer(&control->eeprom_accessor, &msg, 1);
if (ret < 1) {
DRM_ERROR("Failed to read EEPROM table header, ret:%d", ret);
return ret;
}
__decode_table_header_from_buff(hdr, &buff[2]);
if (hdr->header == EEPROM_TABLE_HDR_VAL) {
control->num_recs = (hdr->tbl_size - EEPROM_TABLE_HEADER_SIZE) /
EEPROM_TABLE_RECORD_SIZE;
DRM_DEBUG_DRIVER("Found existing EEPROM table with %d records",
control->num_recs);
} else {
DRM_INFO("Creating new EEPROM table");
hdr->header = EEPROM_TABLE_HDR_VAL;
hdr->version = EEPROM_TABLE_VER;
hdr->first_rec_offset = EEPROM_RECORD_START;
hdr->tbl_size = EEPROM_TABLE_HEADER_SIZE;
adev->psp.ras.ras->eeprom_control.tbl_byte_sum =
__calc_hdr_byte_sum(&adev->psp.ras.ras->eeprom_control);
ret = __update_table_header(control, buff);
}
/* Start inserting records from here */
adev->psp.ras.ras->eeprom_control.next_addr = EEPROM_RECORD_START;
return ret == 1 ? 0 : -EIO;
}
void amdgpu_ras_eeprom_fini(struct amdgpu_ras_eeprom_control *control)
{
struct amdgpu_device *adev = to_amdgpu_device(control);
switch (adev->asic_type) {
case CHIP_VEGA20:
/*TODO Add MI-60 */
break;
default:
return;
}
}
static void __encode_table_record_to_buff(struct amdgpu_ras_eeprom_control *control,
struct eeprom_table_record *record,
unsigned char *buff)
{
__le64 tmp = 0;
int i = 0;
/* Next are all record fields according to EEPROM page spec in LE foramt */
buff[i++] = record->err_type;
buff[i++] = record->bank;
tmp = cpu_to_le64(record->ts);
memcpy(buff + i, &tmp, 8);
i += 8;
tmp = cpu_to_le64((record->offset & 0xffffffffffff));
memcpy(buff + i, &tmp, 6);
i += 6;
buff[i++] = record->mem_channel;
buff[i++] = record->mcumc_id;
tmp = cpu_to_le64((record->retired_page & 0xffffffffffff));
memcpy(buff + i, &tmp, 6);
}
static void __decode_table_record_from_buff(struct amdgpu_ras_eeprom_control *control,
struct eeprom_table_record *record,
unsigned char *buff)
{
__le64 tmp = 0;
int i = 0;
/* Next are all record fields according to EEPROM page spec in LE foramt */
record->err_type = buff[i++];
record->bank = buff[i++];
memcpy(&tmp, buff + i, 8);
record->ts = le64_to_cpu(tmp);
i += 8;
memcpy(&tmp, buff + i, 6);
record->offset = (le64_to_cpu(tmp) & 0xffffffffffff);
i += 6;
buff[i++] = record->mem_channel;
buff[i++] = record->mcumc_id;
memcpy(&tmp, buff + i, 6);
record->retired_page = (le64_to_cpu(tmp) & 0xffffffffffff);
}
/*
* When reaching end of EEPROM memory jump back to 0 record address
* When next record access will go beyond EEPROM page boundary modify bits A17/A8
* in I2C selector to go to next page
*/
static uint32_t __correct_eeprom_dest_address(uint32_t curr_address)
{
uint32_t next_address = curr_address + EEPROM_TABLE_RECORD_SIZE;
/* When all EEPROM memory used jump back to 0 address */
if (next_address > EEPROM_SIZE_BYTES) {
DRM_INFO("Reached end of EEPROM memory, jumping to 0 "
"and overriding old record");
return EEPROM_RECORD_START;
}
/*
* To check if we overflow page boundary compare next address with
* current and see if bits 17/8 of the EEPROM address will change
* If they do start from the next 256b page
*
* https://www.st.com/resource/en/datasheet/m24m02-dr.pdf sec. 5.1.2
*/
if ((curr_address & EEPROM_ADDR_MSB_MASK) != (next_address & EEPROM_ADDR_MSB_MASK)) {
DRM_DEBUG_DRIVER("Reached end of EEPROM memory page, jumpimng to next: %lx",
(next_address & EEPROM_ADDR_MSB_MASK));
return (next_address & EEPROM_ADDR_MSB_MASK);
}
return curr_address;
}
static uint32_t __calc_hdr_byte_sum(struct amdgpu_ras_eeprom_control *control)
{
int i;
uint32_t tbl_sum = 0;
/* Header checksum, skip checksum field in the calculation */
for (i = 0; i < sizeof(control->tbl_hdr) - sizeof(control->tbl_hdr.checksum); i++)
tbl_sum += *(((unsigned char *)&control->tbl_hdr) + i);
return tbl_sum;
}
static uint32_t __calc_recs_byte_sum(struct eeprom_table_record *records,
int num)
{
int i, j;
uint32_t tbl_sum = 0;
/* Records checksum */
for (i = 0; i < num; i++) {
struct eeprom_table_record *record = &records[i];
for (j = 0; j < sizeof(*record); j++) {
tbl_sum += *(((unsigned char *)record) + j);
}
}
return tbl_sum;
}
static inline uint32_t __calc_tbl_byte_sum(struct amdgpu_ras_eeprom_control *control,
struct eeprom_table_record *records, int num)
{
return __calc_hdr_byte_sum(control) + __calc_recs_byte_sum(records, num);
}
/* Checksum = 256 -((sum of all table entries) mod 256) */
static void __update_tbl_checksum(struct amdgpu_ras_eeprom_control *control,
struct eeprom_table_record *records, int num,
uint32_t old_hdr_byte_sum)
{
/*
* This will update the table sum with new records.
*
* TODO: What happens when the EEPROM table is to be wrapped around
* and old records from start will get overridden.
*/
/* need to recalculate updated header byte sum */
control->tbl_byte_sum -= old_hdr_byte_sum;
control->tbl_byte_sum += __calc_tbl_byte_sum(control, records, num);
control->tbl_hdr.checksum = 256 - (control->tbl_byte_sum % 256);
}
/* table sum mod 256 + checksum must equals 256 */
static bool __validate_tbl_checksum(struct amdgpu_ras_eeprom_control *control,
struct eeprom_table_record *records, int num)
{
control->tbl_byte_sum = __calc_tbl_byte_sum(control, records, num);
if (control->tbl_hdr.checksum + (control->tbl_byte_sum % 256) != 256) {
DRM_WARN("Checksum mismatch, checksum: %u ", control->tbl_hdr.checksum);
return false;
}
return true;
}
int amdgpu_ras_eeprom_process_recods(struct amdgpu_ras_eeprom_control *control,
struct eeprom_table_record *records,
bool write,
int num)
{
int i, ret = 0;
struct i2c_msg *msgs;
unsigned char *buffs;
struct amdgpu_device *adev = to_amdgpu_device(control);
if (adev->asic_type != CHIP_VEGA20)
return 0;
buffs = kcalloc(num, EEPROM_ADDRESS_SIZE + EEPROM_TABLE_RECORD_SIZE,
GFP_KERNEL);
if (!buffs)
return -ENOMEM;
mutex_lock(&control->tbl_mutex);
msgs = kcalloc(num, sizeof(*msgs), GFP_KERNEL);
if (!msgs) {
ret = -ENOMEM;
goto free_buff;
}
/* In case of overflow just start from beginning to not lose newest records */
if (write && (control->next_addr + EEPROM_TABLE_RECORD_SIZE * num > EEPROM_SIZE_BYTES))
control->next_addr = EEPROM_RECORD_START;
/*
* TODO Currently makes EEPROM writes for each record, this creates
* internal fragmentation. Optimized the code to do full page write of
* 256b
*/
for (i = 0; i < num; i++) {
unsigned char *buff = &buffs[i * (EEPROM_ADDRESS_SIZE + EEPROM_TABLE_RECORD_SIZE)];
struct eeprom_table_record *record = &records[i];
struct i2c_msg *msg = &msgs[i];
control->next_addr = __correct_eeprom_dest_address(control->next_addr);
/*
* Update bits 16,17 of EEPROM address in I2C address by setting them
* to bits 1,2 of Device address byte
*/
msg->addr = EEPROM_I2C_TARGET_ADDR |
((control->next_addr & EEPROM_ADDR_MSB_MASK) >> 15);
msg->flags = write ? 0 : I2C_M_RD;
msg->len = EEPROM_ADDRESS_SIZE + EEPROM_TABLE_RECORD_SIZE;
msg->buf = buff;
/* Insert the EEPROM dest addess, bits 0-15 */
buff[0] = ((control->next_addr >> 8) & 0xff);
buff[1] = (control->next_addr & 0xff);
/* EEPROM table content is stored in LE format */
if (write)
__encode_table_record_to_buff(control, record, buff + EEPROM_ADDRESS_SIZE);
/*
* The destination EEPROM address might need to be corrected to account
* for page or entire memory wrapping
*/
control->next_addr += EEPROM_TABLE_RECORD_SIZE;
}
ret = i2c_transfer(&control->eeprom_accessor, msgs, num);
if (ret < 1) {
DRM_ERROR("Failed to process EEPROM table records, ret:%d", ret);
/* TODO Restore prev next EEPROM address ? */
goto free_msgs;
}
if (!write) {
for (i = 0; i < num; i++) {
unsigned char *buff = &buffs[i*(EEPROM_ADDRESS_SIZE + EEPROM_TABLE_RECORD_SIZE)];
struct eeprom_table_record *record = &records[i];
__decode_table_record_from_buff(control, record, buff + EEPROM_ADDRESS_SIZE);
}
}
if (write) {
uint32_t old_hdr_byte_sum = __calc_hdr_byte_sum(control);
/*
* Update table header with size and CRC and account for table
* wrap around where the assumption is that we treat it as empty
* table
*
* TODO - Check the assumption is correct
*/
control->num_recs += num;
control->num_recs %= EEPROM_MAX_RECORD_NUM;
control->tbl_hdr.tbl_size += EEPROM_TABLE_RECORD_SIZE * num;
if (control->tbl_hdr.tbl_size > EEPROM_SIZE_BYTES)
control->tbl_hdr.tbl_size = EEPROM_TABLE_HEADER_SIZE +
control->num_recs * EEPROM_TABLE_RECORD_SIZE;
__update_tbl_checksum(control, records, num, old_hdr_byte_sum);
__update_table_header(control, buffs);
} else if (!__validate_tbl_checksum(control, records, num)) {
DRM_WARN("EEPROM Table checksum mismatch!");
/* TODO Uncomment when EEPROM read/write is relliable */
/* ret = -EIO; */
}
free_msgs:
kfree(msgs);
free_buff:
kfree(buffs);
mutex_unlock(&control->tbl_mutex);
return ret == num ? 0 : -EIO;
}
/* Used for testing if bugs encountered */
#if 0
void amdgpu_ras_eeprom_test(struct amdgpu_ras_eeprom_control *control)
{
int i;
struct eeprom_table_record *recs = kcalloc(1, sizeof(*recs), GFP_KERNEL);
if (!recs)
return;
for (i = 0; i < 1 ; i++) {
recs[i].address = 0xdeadbeef;
recs[i].retired_page = i;
}
if (!amdgpu_ras_eeprom_process_recods(control, recs, true, 1)) {
memset(recs, 0, sizeof(*recs) * 1);
control->next_addr = EEPROM_RECORD_START;
if (!amdgpu_ras_eeprom_process_recods(control, recs, false, 1)) {
for (i = 0; i < 1; i++)
DRM_INFO("rec.address :0x%llx, rec.retired_page :%llu",
recs[i].address, recs[i].retired_page);
} else
DRM_ERROR("Failed in reading from table");
} else
DRM_ERROR("Failed in writing to table");
}
#endif

90
drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h Normal file
View File

@ -0,0 +1,90 @@
/*
* Copyright 2019 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
*/
#ifndef _AMDGPU_RAS_EEPROM_H
#define _AMDGPU_RAS_EEPROM_H
#include <linux/i2c.h>
struct amdgpu_device;
enum amdgpu_ras_eeprom_err_type{
AMDGPU_RAS_EEPROM_ERR_PLACE_HOLDER,
AMDGPU_RAS_EEPROM_ERR_RECOVERABLE,
AMDGPU_RAS_EEPROM_ERR_NON_RECOVERABLE
};
struct amdgpu_ras_eeprom_table_header {
uint32_t header;
uint32_t version;
uint32_t first_rec_offset;
uint32_t tbl_size;
uint32_t checksum;
}__attribute__((__packed__));
struct amdgpu_ras_eeprom_control {
struct amdgpu_ras_eeprom_table_header tbl_hdr;
struct i2c_adapter eeprom_accessor;
uint32_t next_addr;
unsigned int num_recs;
struct mutex tbl_mutex;
bool bus_locked;
uint32_t tbl_byte_sum;
};
/*
* Represents single table record. Packed to be easily serialized into byte
* stream.
*/
struct eeprom_table_record {
union {
uint64_t address;
uint64_t offset;
};
uint64_t retired_page;
uint64_t ts;
enum amdgpu_ras_eeprom_err_type err_type;
union {
unsigned char bank;
unsigned char cu;
};
unsigned char mem_channel;
unsigned char mcumc_id;
}__attribute__((__packed__));
int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control);
void amdgpu_ras_eeprom_fini(struct amdgpu_ras_eeprom_control *control);
int amdgpu_ras_eeprom_process_recods(struct amdgpu_ras_eeprom_control *control,
struct eeprom_table_record *records,
bool write,
int num);
void amdgpu_ras_eeprom_test(struct amdgpu_ras_eeprom_control *control);
#endif // _AMDGPU_RAS_EEPROM_H