From db338e16638465cb8053bcb8d9c9778788545463 Mon Sep 17 00:00:00 2001 From: Andrey Grodzovsky Date: Thu, 12 Sep 2019 17:16:32 -0400 Subject: [PATCH] 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 Reviewed-by: Guchun Chen Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 164 +++++++++++++------------ 1 file changed, 86 insertions(+), 78 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c index 11a8445..d0e020e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c @@ -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, -- 2.7.4