From: Shiju Jose <shiju.jose@huawei.com>
Date: Fri, 19 Oct 2018 20:15:26 +0100
Subject: net: hns3: Add PCIe AER callback error_detected
Patch-mainline: v4.20-rc1
Git-commit: 5a9f0eac935b3edbcb3155301cc8aa1e22c04ccd
References: bsc#1104353 FATE#326415

Set of hw errors occurred in the HNS3 are reported to the
hns3 driver through PCIe AER and RAS.The error info will be
processed and appropriately recovered.
This patch adds error_detected callback and error processing.

Signed-off-by: Shiju Jose <shiju.jose@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hnae3.h             |    1 
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c         |   30 ++++++++++++
 drivers/net/ethernet/hisilicon/hns3/hns3pf/Makefile     |    2 
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_err.c  |   38 ++++++++++++++++
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_err.h  |   29 ++++++++++++
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c |    2 
 6 files changed, 101 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_err.c
 create mode 100644 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_err.h

--- a/drivers/net/ethernet/hisilicon/hns3/hnae3.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hnae3.h
@@ -429,6 +429,7 @@ struct hnae3_ae_ops {
 				struct ethtool_rxnfc *cmd, u32 *rule_locs);
 	int (*restore_fd_rules)(struct hnae3_handle *handle);
 	void (*enable_fd)(struct hnae3_handle *handle, bool enable);
+	pci_ers_result_t (*process_hw_error)(struct hnae3_ae_dev *ae_dev);
 };
 
 struct hnae3_dcb_ops {
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -1771,6 +1771,35 @@ static void hns3_shutdown(struct pci_dev
 		pci_set_power_state(pdev, PCI_D3hot);
 }
 
+static pci_ers_result_t hns3_error_detected(struct pci_dev *pdev,
+					    pci_channel_state_t state)
+{
+	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(pdev);
+	pci_ers_result_t ret;
+
+	dev_info(&pdev->dev, "PCI error detected, state(=%d)!!\n", state);
+
+	if (state == pci_channel_io_perm_failure)
+		return PCI_ERS_RESULT_DISCONNECT;
+
+	if (!ae_dev) {
+		dev_err(&pdev->dev,
+			"Can't recover - error happened during device init\n");
+		return PCI_ERS_RESULT_NONE;
+	}
+
+	if (ae_dev->ops->process_hw_error)
+		ret = ae_dev->ops->process_hw_error(ae_dev);
+	else
+		return PCI_ERS_RESULT_NONE;
+
+	return ret;
+}
+
+static const struct pci_error_handlers hns3_err_handler = {
+	.error_detected = hns3_error_detected,
+};
+
 static struct pci_driver hns3_driver = {
 	.name     = hns3_driver_name,
 	.id_table = hns3_pci_tbl,
@@ -1778,6 +1807,7 @@ static struct pci_driver hns3_driver = {
 	.remove   = hns3_remove,
 	.shutdown = hns3_shutdown,
 	.sriov_configure = hns3_pci_sriov_configure,
+	.err_handler    = &hns3_err_handler,
 };
 
 /* set default feature to hns3 */
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/Makefile
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/Makefile
@@ -6,6 +6,6 @@
 ccflags-y := -Idrivers/net/ethernet/hisilicon/hns3
 
 obj-$(CONFIG_HNS3_HCLGE) += hclge.o
-hclge-objs = hclge_main.o hclge_cmd.o hclge_mdio.o hclge_tm.o hclge_mbx.o
+hclge-objs = hclge_main.o hclge_cmd.o hclge_mdio.o hclge_tm.o hclge_mbx.o hclge_err.o
 
 hclge-$(CONFIG_HNS3_DCB) += hclge_dcb.o
--- /dev/null
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_err.c
@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* Copyright (c) 2016-2017 Hisilicon Limited. */
+
+#include "hclge_err.h"
+
+static const struct hclge_hw_blk hw_blk[] = {
+	{ /* sentinel */ }
+};
+
+pci_ers_result_t hclge_process_ras_hw_error(struct hnae3_ae_dev *ae_dev)
+{
+	struct hclge_dev *hdev = ae_dev->priv;
+	struct device *dev = &hdev->pdev->dev;
+	u32 sts, val;
+	int i = 0;
+
+	sts = hclge_read_dev(&hdev->hw, HCLGE_RAS_PF_OTHER_INT_STS_REG);
+
+	/* Processing Non-fatal errors */
+	if (sts & HCLGE_RAS_REG_NFE_MASK) {
+		val = (sts >> HCLGE_RAS_REG_NFE_SHIFT) & 0xFF;
+		i = 0;
+		while (hw_blk[i].name) {
+			if (!(hw_blk[i].msk & val)) {
+				i++;
+				continue;
+			}
+			dev_warn(dev, "%s ras non-fatal error identified\n",
+				 hw_blk[i].name);
+			if (hw_blk[i].process_error)
+				hw_blk[i].process_error(hdev,
+							 HCLGE_ERR_INT_RAS_NFE);
+			i++;
+		}
+	}
+
+	return PCI_ERS_RESULT_NEED_RESET;
+}
--- /dev/null
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_err.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*  Copyright (c) 2016-2017 Hisilicon Limited. */
+
+#ifndef __HCLGE_ERR_H
+#define __HCLGE_ERR_H
+
+#include "hclge_main.h"
+
+#define HCLGE_RAS_PF_OTHER_INT_STS_REG   0x20B00
+#define HCLGE_RAS_REG_FE_MASK    0xFF
+#define HCLGE_RAS_REG_NFE_MASK   0xFF00
+#define HCLGE_RAS_REG_NFE_SHIFT	8
+
+enum hclge_err_int_type {
+	HCLGE_ERR_INT_MSIX = 0,
+	HCLGE_ERR_INT_RAS_CE = 1,
+	HCLGE_ERR_INT_RAS_NFE = 2,
+	HCLGE_ERR_INT_RAS_FE = 3,
+};
+
+struct hclge_hw_blk {
+	u32 msk;
+	const char *name;
+	void (*process_error)(struct hclge_dev *hdev,
+			      enum hclge_err_int_type type);
+};
+
+pci_ers_result_t hclge_process_ras_hw_error(struct hnae3_ae_dev *ae_dev);
+#endif
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c
@@ -19,6 +19,7 @@
 #include "hclge_mbx.h"
 #include "hclge_mdio.h"
 #include "hclge_tm.h"
+#include "hclge_err.h"
 #include "hnae3.h"
 
 #define HCLGE_NAME			"hclge"
@@ -7322,6 +7323,7 @@ static const struct hnae3_ae_ops hclge_o
 	.get_fd_all_rules = hclge_get_all_rules,
 	.restore_fd_rules = hclge_restore_fd_entries,
 	.enable_fd = hclge_enable_fd,
+	.process_hw_error = hclge_process_ras_hw_error,
 };
 
 static struct hnae3_ae_algo ae_algo = {