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drm/amdgpu:Fix EEPROM checksum calculation. 

Fix checksum calculation after manually resetting the table.
Unify reset and empty EEPROM init flow.
Protect the table reset with lock.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Andrey Grodzovsky 2019-09-12 17:16:32 -04:00 committed by Alex Deucher
parent 012dd14d1d
commit db338e1663
1 changed files with 86 additions and 78 deletions
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164
drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
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@ -100,22 +100,100 @@ static int __update_table_header(struct amdgpu_ras_eeprom_control *control,
return ret;
}
static uint32_t __calc_hdr_byte_sum(struct amdgpu_ras_eeprom_control *control);
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_reset_table(struct amdgpu_ras_eeprom_control *control)
{
unsigned char buff[EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE] = { 0 };
struct amdgpu_device *adev = to_amdgpu_device(control);
struct amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr;
int ret = 0;
mutex_lock(&control->tbl_mutex);
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);
return __update_table_header(control, buff);
control->tbl_byte_sum = 0;
__update_tbl_checksum(control, NULL, 0, 0);
control->next_addr = EEPROM_RECORD_START;
ret = __update_table_header(control, buff);
mutex_unlock(&control->tbl_mutex);
return ret;
}
int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control)
@ -159,6 +237,9 @@ int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control)
if (hdr->header == EEPROM_TABLE_HDR_VAL) {
control->num_recs = (hdr->tbl_size - EEPROM_TABLE_HEADER_SIZE) /
EEPROM_TABLE_RECORD_SIZE;
control->tbl_byte_sum = __calc_hdr_byte_sum(control);
control->next_addr = EEPROM_RECORD_START;
DRM_DEBUG_DRIVER("Found existing EEPROM table with %d records",
control->num_recs);
@ -168,9 +249,6 @@ int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control)
ret = amdgpu_ras_eeprom_reset_table(control);
}
/* Start inserting records from here */
adev->psp.ras.ras->eeprom_control.next_addr = EEPROM_RECORD_START;
return ret == 1 ? 0 : -EIO;
}
@ -275,76 +353,6 @@ static uint32_t __correct_eeprom_dest_address(uint32_t curr_address)
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,