[PATCH] drm/amdgpu: Fix EEPROM checksum calculation.
Andrey Grodzovsky
andrey.grodzovsky at amd.com
Fri Sep 13 16:09:16 UTC 2019
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 at amd.com>
---
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
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