[PATCH 15/21] drm/amdgpu: add a flag to indicate UMC channel index version

[Tao Zhou]

v1 (legacy way): store channel index within a UMC instance in eeprom
v2: store global channel index in eeprom

V2: only save the flag on eeprom, clear it after saving.

Signed-off-by: Tao Zhou <tao.zhou1 at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c | 11 ++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_umc.h        | 16 ++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
index f28f6b4ba765..f4a9e15389ae 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
@@ -841,7 +841,7 @@ int amdgpu_ras_eeprom_append(struct amdgpu_ras_eeprom_control *control,
 			     const u32 num)
 {
 	struct amdgpu_device *adev = to_amdgpu_device(control);
-	int res;
+	int res, i;
 
 	if (!__is_ras_eeprom_supported(adev))
 		return 0;
@@ -855,6 +855,10 @@ int amdgpu_ras_eeprom_append(struct amdgpu_ras_eeprom_control *control,
 		return -EINVAL;
 	}
 
+	/* set the new channel index flag */
+	for (i = 0; i < num; i++)
+		record[i].retired_page |= UMC_CHANNEL_IDX_V2;
+
 	mutex_lock(&control->ras_tbl_mutex);
 
 	res = amdgpu_ras_eeprom_append_table(control, record, num);
@@ -864,6 +868,11 @@ int amdgpu_ras_eeprom_append(struct amdgpu_ras_eeprom_control *control,
 		amdgpu_ras_debugfs_set_ret_size(control);
 
 	mutex_unlock(&control->ras_tbl_mutex);
+
+	/* clear channel index flag, the flag is only saved on eeprom */
+	for (i = 0; i < num; i++)
+		record[i].retired_page &= ~UMC_CHANNEL_IDX_V2;
+
 	return res;
 }
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_umc.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_umc.h
index 2f71194d5da8..f97c45b4eeb8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_umc.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_umc.h
@@ -54,6 +54,22 @@
 
 /* Page retirement tag */
 #define UMC_ECC_NEW_DETECTED_TAG       0x1
+/*
+ * a flag to indicate v2 of channel index stored in eeprom
+ *
+ * v1 (legacy way): store channel index within a umc instance in eeprom
+ *    range in UMC v12: 0 ~ 7
+ * v2: store global channel index in eeprom
+ *    range in UMC v12: 0 ~ 127
+ *
+ * NOTE: it's better to store it in eeprom_table_record.mem_channel,
+ * but there is only 8 bits in mem_channel, and the channel number may
+ * increase in the future, we decide to save it in
+ * eeprom_table_record.retired_page. retired_page is useless in v2,
+ * we depend on eeprom_table_record.address instead of retired_page in v2.
+ * Only 48 bits are saved on eeprom, use bit 47 here.
+ */
+#define UMC_CHANNEL_IDX_V2	BIT_ULL(47)
 
 typedef int (*umc_func)(struct amdgpu_device *adev, uint32_t node_inst,
 			uint32_t umc_inst, uint32_t ch_inst, void *data);
-- 
2.34.1