net: hns3: refactor dump reset info of debugfs

Currently, the debugfs command for reset info is implemented by
"echo xxxx > cmd", and record the information in dmesg. It's
unnecessary and heavy. To improve it, create a single file
"reset_info" for it, and query it by command "cat reset_info",
return the result to userspace, rather than record in dmesg.

The display style is below:
$cat reset_info
PF reset count: 0
FLR reset count: 0
GLOBAL reset count: 0
IMP reset count: 0
reset done count: 0
HW reset done count: 0
reset count: 0
reset fail count: 0
vector0 interrupt enable status: 0x1
reset interrupt source: 0x0
reset interrupt status: 0x0
RAS interrupt status:0x0
hardware reset status: 0x0
handshake status: 0x80
function reset status: 0x0

Change to the "hclge_show_rst_info" in the "hclge_reset_err_handle",
when the reset fails, display reset info immediately.
Signed-off-by: Jiaran Zhang <zhangjiaran@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hnae3.h

@@ -262,6 +262,7 @@ enum hnae3_dbg_cmd {
 	HNAE3_DBG_CMD_MNG_TBL,
 	HNAE3_DBG_CMD_LOOPBACK,
 	HNAE3_DBG_CMD_INTERRUPT_INFO,
+	HNAE3_DBG_CMD_RESET_INFO,
 	HNAE3_DBG_CMD_UNKNOWN,
 };
 

drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c

@@ -111,6 +111,13 @@ static struct hns3_dbg_cmd_info hns3_dbg_cmd[] = {
 		.buf_len = HNS3_DBG_READ_LEN,
 		.init = hns3_dbg_common_file_init,
 	},
+	{
+		.name = "reset_info",
+		.cmd = HNAE3_DBG_CMD_RESET_INFO,
+		.dentry = HNS3_DBG_DENTRY_COMMON,
+		.buf_len = HNS3_DBG_READ_LEN,
+		.init = hns3_dbg_common_file_init,
+	},
 };
 
 static struct hns3_dbg_cap_info hns3_dbg_cap[] = {
@@ -505,7 +512,6 @@ static void hns3_dbg_help(struct hnae3_handle *h)
 	dev_info(&h->pdev->dev, "dump qos pause cfg\n");
 	dev_info(&h->pdev->dev, "dump qos pri map\n");
 	dev_info(&h->pdev->dev, "dump qos buf cfg\n");
-	dev_info(&h->pdev->dev, "dump reset info\n");
 	dev_info(&h->pdev->dev, "dump m7 info\n");
 	dev_info(&h->pdev->dev, "dump ncl_config <offset> <length>(in hex)\n");
 	dev_info(&h->pdev->dev, "dump mac tnl status\n");

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c

@@ -4,6 +4,7 @@
 #include <linux/device.h>
 
 #include "hclge_debugfs.h"
+#include "hclge_err.h"
 #include "hclge_main.h"
 #include "hclge_tm.h"
 #include "hnae3.h"
@@ -1389,37 +1390,46 @@ static void hclge_dbg_fd_tcam(struct hclge_dev *hdev)
 	kfree(rule_locs);
 }
 
-void hclge_dbg_dump_rst_info(struct hclge_dev *hdev)
+int hclge_dbg_dump_rst_info(struct hclge_dev *hdev, char *buf, int len)
 {
-	dev_info(&hdev->pdev->dev, "PF reset count: %u\n",
+	int pos = 0;
+
+	pos += scnprintf(buf + pos, len - pos, "PF reset count: %u\n",
 			 hdev->rst_stats.pf_rst_cnt);
-	dev_info(&hdev->pdev->dev, "FLR reset count: %u\n",
+	pos += scnprintf(buf + pos, len - pos, "FLR reset count: %u\n",
 			 hdev->rst_stats.flr_rst_cnt);
-	dev_info(&hdev->pdev->dev, "GLOBAL reset count: %u\n",
+	pos += scnprintf(buf + pos, len - pos, "GLOBAL reset count: %u\n",
 			 hdev->rst_stats.global_rst_cnt);
-	dev_info(&hdev->pdev->dev, "IMP reset count: %u\n",
+	pos += scnprintf(buf + pos, len - pos, "IMP reset count: %u\n",
 			 hdev->rst_stats.imp_rst_cnt);
-	dev_info(&hdev->pdev->dev, "reset done count: %u\n",
+	pos += scnprintf(buf + pos, len - pos, "reset done count: %u\n",
 			 hdev->rst_stats.reset_done_cnt);
-	dev_info(&hdev->pdev->dev, "HW reset done count: %u\n",
+	pos += scnprintf(buf + pos, len - pos, "HW reset done count: %u\n",
 			 hdev->rst_stats.hw_reset_done_cnt);
-	dev_info(&hdev->pdev->dev, "reset count: %u\n",
+	pos += scnprintf(buf + pos, len - pos, "reset count: %u\n",
 			 hdev->rst_stats.reset_cnt);
-	dev_info(&hdev->pdev->dev, "reset fail count: %u\n",
+	pos += scnprintf(buf + pos, len - pos, "reset fail count: %u\n",
 			 hdev->rst_stats.reset_fail_cnt);
-	dev_info(&hdev->pdev->dev, "vector0 interrupt enable status: 0x%x\n",
+	pos += scnprintf(buf + pos, len - pos,
+			 "vector0 interrupt enable status: 0x%x\n",
 			 hclge_read_dev(&hdev->hw, HCLGE_MISC_VECTOR_REG_BASE));
-	dev_info(&hdev->pdev->dev, "reset interrupt source: 0x%x\n",
+	pos += scnprintf(buf + pos, len - pos, "reset interrupt source: 0x%x\n",
 			 hclge_read_dev(&hdev->hw, HCLGE_MISC_RESET_STS_REG));
-	dev_info(&hdev->pdev->dev, "reset interrupt status: 0x%x\n",
+	pos += scnprintf(buf + pos, len - pos, "reset interrupt status: 0x%x\n",
 			 hclge_read_dev(&hdev->hw, HCLGE_MISC_VECTOR_INT_STS));
-	dev_info(&hdev->pdev->dev, "hardware reset status: 0x%x\n",
+	pos += scnprintf(buf + pos, len - pos, "RAS interrupt status: 0x%x\n",
+			 hclge_read_dev(&hdev->hw,
+					HCLGE_RAS_PF_OTHER_INT_STS_REG));
+	pos += scnprintf(buf + pos, len - pos, "hardware reset status: 0x%x\n",
 			 hclge_read_dev(&hdev->hw, HCLGE_GLOBAL_RESET_REG));
-	dev_info(&hdev->pdev->dev, "handshake status: 0x%x\n",
+	pos += scnprintf(buf + pos, len - pos, "handshake status: 0x%x\n",
 			 hclge_read_dev(&hdev->hw, HCLGE_NIC_CSQ_DEPTH_REG));
-	dev_info(&hdev->pdev->dev, "function reset status: 0x%x\n",
+	pos += scnprintf(buf + pos, len - pos, "function reset status: 0x%x\n",
 			 hclge_read_dev(&hdev->hw, HCLGE_FUN_RST_ING));
-	dev_info(&hdev->pdev->dev, "hdev state: 0x%lx\n", hdev->state);
+	pos += scnprintf(buf + pos, len - pos, "hdev state: 0x%lx\n",
+			 hdev->state);
+
+	return 0;
 }
 
 static void hclge_dbg_dump_serv_info(struct hclge_dev *hdev)
@@ -1819,8 +1829,6 @@ int hclge_dbg_run_cmd(struct hnae3_handle *handle, const char *cmd_buf)
 		hclge_dbg_dump_qos_buf_cfg(hdev);
 	} else if (strncmp(cmd_buf, DUMP_REG, strlen(DUMP_REG)) == 0) {
 		hclge_dbg_dump_reg_cmd(hdev, &cmd_buf[sizeof(DUMP_REG)]);
-	} else if (strncmp(cmd_buf, "dump reset info", 15) == 0) {
-		hclge_dbg_dump_rst_info(hdev);
 	} else if (strncmp(cmd_buf, "dump serv info", 14) == 0) {
 		hclge_dbg_dump_serv_info(hdev);
 	} else if (strncmp(cmd_buf, "dump m7 info", 12) == 0) {
@@ -1874,6 +1882,10 @@ static const struct hclge_dbg_func hclge_dbg_cmd_func[] = {
 		.cmd = HNAE3_DBG_CMD_INTERRUPT_INFO,
 		.dbg_dump = hclge_dbg_dump_interrupt,
 	},
+	{
+		.cmd = HNAE3_DBG_CMD_RESET_INFO,
+		.dbg_dump = hclge_dbg_dump_rst_info,
+	},
 };
 
 int hclge_dbg_read_cmd(struct hnae3_handle *handle, enum hnae3_dbg_cmd cmd,

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -3936,6 +3936,21 @@ static int hclge_reset_prepare_wait(struct hclge_dev *hdev)
 	return ret;
 }
 
+static void hclge_show_rst_info(struct hclge_dev *hdev)
+{
+	char *buf;
+
+	buf = kzalloc(HCLGE_DBG_RESET_INFO_LEN, GFP_KERNEL);
+	if (!buf)
+		return;
+
+	hclge_dbg_dump_rst_info(hdev, buf, HCLGE_DBG_RESET_INFO_LEN);
+
+	dev_info(&hdev->pdev->dev, "dump reset info:\n%s", buf);
+
+	kfree(buf);
+}
+
 static bool hclge_reset_err_handle(struct hclge_dev *hdev)
 {
 #define MAX_RESET_FAIL_CNT 5
@@ -3966,7 +3981,7 @@ static bool hclge_reset_err_handle(struct hclge_dev *hdev)
 
 	dev_err(&hdev->pdev->dev, "Reset fail!\n");
 
-	hclge_dbg_dump_rst_info(hdev);
+	hclge_show_rst_info(hdev);
 
 	set_bit(HCLGE_STATE_RST_FAIL, &hdev->state);
 

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h

@@ -148,6 +148,8 @@
 
 #define HCLGE_MAX_QSET_NUM		1024
 
+#define HCLGE_DBG_RESET_INFO_LEN	1024
+
 enum HLCGE_PORT_TYPE {
 	HOST_PORT,
 	NETWORK_PORT
@@ -1089,6 +1091,6 @@ int hclge_query_bd_num_cmd_send(struct hclge_dev *hdev,
 void hclge_report_hw_error(struct hclge_dev *hdev,
 			   enum hnae3_hw_error_type type);
 void hclge_inform_vf_promisc_info(struct hclge_vport *vport);
-void hclge_dbg_dump_rst_info(struct hclge_dev *hdev);
+int hclge_dbg_dump_rst_info(struct hclge_dev *hdev, char *buf, int len);
 int hclge_push_vf_link_status(struct hclge_vport *vport);
 #endif