[PATCH] drm/amdgpu: remove unnecessary reading for epprom header

[Zhang, Hawking]

[AMD Public Use]

What about merge this function with amdgpu_ras_check_err_threshold?

Regards,
Hawking

-----Original Message-----
From: Dennis Li <Dennis.Li at amd.com> 
Sent: Friday, February 26, 2021 09:26
To: amd-gfx at lists.freedesktop.org; Chen, Guchun <Guchun.Chen at amd.com>; Zhang, Hawking <Hawking.Zhang at amd.com>; Koenig, Christian <Christian.Koenig at amd.com>
Cc: Li, Dennis <Dennis.Li at amd.com>
Subject: [PATCH] drm/amdgpu: remove unnecessary reading for epprom header

If the number of badpage records exceed the threshold, driver has updated both epprom header and control->tbl_hdr.header before gpu reset, therefore GPU recovery thread no need to read epprom header directly.

Signed-off-by: Dennis Li <Dennis.Li at amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
index 19d9aa76cfbf..4310ad63890c 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras_eeprom.c
@@ -439,41 +439,19 @@ int amdgpu_ras_eeprom_check_err_threshold(
 				bool *exceed_err_limit)
 {
 	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 = control->i2c_address,
-			.flags = I2C_M_RD,
-			.len = EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE,
-			.buf = buff,
-	};
-	int ret;
 
 	*exceed_err_limit = false;
 
 	if (!__is_ras_eeprom_supported(adev))
 		return 0;
 
-	/* read EEPROM table header */
-	mutex_lock(&control->tbl_mutex);
-	ret = i2c_transfer(&adev->pm.smu_i2c, &msg, 1);
-	if (ret < 1) {
-		dev_err(adev->dev, "Failed to read EEPROM table header.\n");
-		goto err;
-	}
-
-	__decode_table_header_from_buff(hdr, &buff[2]);
-
-	if (hdr->header == EEPROM_TABLE_HDR_BAD) {
+	if (control->tbl_hdr.header == EEPROM_TABLE_HDR_BAD) {
 		dev_warn(adev->dev, "This GPU is in BAD status.");
 		dev_warn(adev->dev, "Please retire it or setting one bigger "
 				"threshold value when reloading driver.\n");
 		*exceed_err_limit = true;
 	}
 
-err:
-	mutex_unlock(&control->tbl_mutex);
 	return 0;
 }
 
--
2.17.1