drm/amdgpu: exclude duplicate pages from UMC RAS UE count

If a UMC bad page is reserved but not freed by an application, the
application may trigger uncorrectable error repeatly by accessing the page.

v2: add specific function to do the check.
v3: remove duplicate pages, calculate new added bad page number.
v4: reuse save_bad_pages to calculate new added bad page number.

Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Stanley.Yang <Stanley.Yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: Tao Zhou

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

@@ -176,7 +176,7 @@ static int amdgpu_reserve_page_direct(struct amdgpu_device *adev, uint64_t addre
 	if (amdgpu_bad_page_threshold != 0) {
 		amdgpu_ras_add_bad_pages(adev, err_data.err_addr,
 					 err_data.err_addr_cnt);
-		amdgpu_ras_save_bad_pages(adev);
+		amdgpu_ras_save_bad_pages(adev, NULL);
 	}
 
 	dev_warn(adev->dev, "WARNING: THIS IS ONLY FOR TEST PURPOSES AND WILL CORRUPT RAS EEPROM\n");
@@ -2084,22 +2084,32 @@ int amdgpu_ras_add_bad_pages(struct amdgpu_device *adev,
 /*
  * write error record array to eeprom, the function should be
  * protected by recovery_lock
+ * new_cnt: new added UE count, excluding reserved bad pages, can be NULL
  */
-int amdgpu_ras_save_bad_pages(struct amdgpu_device *adev)
+int amdgpu_ras_save_bad_pages(struct amdgpu_device *adev,
+		unsigned long *new_cnt)
 {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 	struct ras_err_handler_data *data;
 	struct amdgpu_ras_eeprom_control *control;
 	int save_count;
 
-	if (!con || !con->eh_data)
+	if (!con || !con->eh_data) {
+		if (new_cnt)
+			*new_cnt = 0;
+
 		return 0;
+	}
 
 	mutex_lock(&con->recovery_lock);
 	control = &con->eeprom_control;
 	data = con->eh_data;
 	save_count = data->count - control->ras_num_recs;
 	mutex_unlock(&con->recovery_lock);
+
+	if (new_cnt)
+		*new_cnt = save_count / adev->umc.retire_unit;
+
 	/* only new entries are saved */
 	if (save_count > 0) {
 		if (amdgpu_ras_eeprom_append(control,

drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h

@@ -547,7 +547,8 @@ int amdgpu_ras_query_error_count(struct amdgpu_device *adev,
 int amdgpu_ras_add_bad_pages(struct amdgpu_device *adev,
 		struct eeprom_table_record *bps, int pages);
 
-int amdgpu_ras_save_bad_pages(struct amdgpu_device *adev);
+int amdgpu_ras_save_bad_pages(struct amdgpu_device *adev,
+		unsigned long *new_cnt);
 
 static inline enum ta_ras_block
 amdgpu_ras_block_to_ta(enum amdgpu_ras_block block) {

drivers/gpu/drm/amd/amdgpu/amdgpu_umc.c

@@ -68,7 +68,7 @@ int amdgpu_umc_page_retirement_mca(struct amdgpu_device *adev,
 	if (amdgpu_bad_page_threshold != 0) {
 		amdgpu_ras_add_bad_pages(adev, err_data.err_addr,
 						err_data.err_addr_cnt);
-		amdgpu_ras_save_bad_pages(adev);
+		amdgpu_ras_save_bad_pages(adev, NULL);
 	}
 
 out:
@@ -147,7 +147,7 @@ static int amdgpu_umc_do_page_retirement(struct amdgpu_device *adev,
 			err_data->err_addr_cnt) {
 			amdgpu_ras_add_bad_pages(adev, err_data->err_addr,
 						err_data->err_addr_cnt);
-			amdgpu_ras_save_bad_pages(adev);
+			amdgpu_ras_save_bad_pages(adev, &(err_data->ue_count));
 
 			amdgpu_dpm_send_hbm_bad_pages_num(adev, con->eeprom_control.ras_num_recs);