> -----Original Message-----
> From: Andrey Grodzovsky <andrey.grodzov...@amd.com>
> Sent: 2019年8月22日 4:02
> To: amd-gfx@lists.freedesktop.org
> Cc: Deucher, Alexander <alexander.deuc...@amd.com>; Pan, Xinhui
> <xinhui....@amd.com>; Zhang, Hawking <hawking.zh...@amd.com>;
> Tuikov, Luben <luben.tui...@amd.com>; Lazar, Lijo <lijo.la...@amd.com>;
> Quan, Evan <evan.q...@amd.com>; Panariti, David
> <david.panar...@amd.com>; Russell, Kent <kent.russ...@amd.com>; Zhou1,
> Tao <tao.zh...@amd.com>; Grodzovsky, Andrey
> <andrey.grodzov...@amd.com>
> Subject: [PATCH v4 1/4] drm/amdgpu: Add RAS EEPROM table.
>
> 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.
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzov...@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/Makefile | 2 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 3 +
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 482
> +++++++++++++++++++++++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h | 90 +++++
> 4 files changed, 576 insertions(+), 1 deletion(-) create mode 100644
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> create mode 100644
> drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile
> b/drivers/gpu/drm/amd/amdgpu/Makefile
> index 28d76bd..f016cf1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/Makefile
> +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
> @@ -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
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> index 2765f2d..8d5bcd8 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
> @@ -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 {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> new file mode 100644
> index 0000000..bf07515
> --- /dev/null
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
> @@ -0,0 +1,482 @@
> +/*
> + * 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
> +
> +#define EEPROM_TABLE_HEADER_SIZE 20
> +#define EEPROM_TABLE_RECORD_SIZE 24
[Tao] should we replace fixed value with sizeof for the two macros?
> +#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;
[Tao] I think sizeof(record->ts) is better
> +
> + tmp = cpu_to_le64((record->offset & 0xffffffffffff));
[Tao] (0x1ULL << 49 - 1) is more readable than & 0xffffffffffff, or a macro can
be defined, but either way is OK.
> + 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); }
[Tao] we can change 256 to EEPROM_PAGE__SIZE_BYTES
> +
> +/* 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)];
[Tao] space is needed before and after "*"
> + struct eeprom_table_record *record = &records[i];
[Tao] add a space after "*"
> +
> + __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;
> +}
> +
> +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"); }
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> new file mode 100644
> index 0000000..41f3fcb
> --- /dev/null
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.h
> @@ -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
> --
> 2.7.4
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