From: Alex Vesker <valex@mellanox.com>
Date: Thu, 12 Jul 2018 15:13:18 +0300
Subject: net/mlx4_core: Use devlink region_snapshot parameter
Patch-mainline: v4.19-rc1
Git-commit: 3c641ba4a852cf4e90e3d7f29c5df08e24213c5d
References: bsc#1103989 FATE#326004

This parameter enables capturing region snapshot of the crspace
during critical errors. The default value of this parameter is
disabled, it can be enabled using devlink param commands.
It is possible to configure during runtime and also driver init.

Signed-off-by: Alex Vesker <valex@mellanox.com>
Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Moshe Shemesh <moshe@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx4/crdump.c |    8 +++++
 drivers/net/ethernet/mellanox/mlx4/main.c   |   41 ++++++++++++++++++++++++++++
 include/linux/mlx4/device.h                 |    1 
 3 files changed, 50 insertions(+)

--- a/drivers/net/ethernet/mellanox/mlx4/crdump.c
+++ b/drivers/net/ethernet/mellanox/mlx4/crdump.c
@@ -158,6 +158,7 @@ static void mlx4_crdump_collect_fw_healt
 int mlx4_crdump_collect(struct mlx4_dev *dev)
 {
 	struct devlink *devlink = priv_to_devlink(mlx4_priv(dev));
+	struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
 	struct pci_dev *pdev = dev->persist->pdev;
 	unsigned long cr_res_size;
 	u8 __iomem *cr_space;
@@ -168,6 +169,11 @@ int mlx4_crdump_collect(struct mlx4_dev
 		return 0;
 	}
 
+	if (!crdump->snapshot_enable) {
+		mlx4_info(dev, "crdump: devlink snapshot disabled, skipping\n");
+		return 0;
+	}
+
 	cr_res_size = pci_resource_len(pdev, 0);
 
 	cr_space = ioremap(pci_resource_start(pdev, 0), cr_res_size);
@@ -197,6 +203,8 @@ int mlx4_crdump_init(struct mlx4_dev *de
 	struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
 	struct pci_dev *pdev = dev->persist->pdev;
 
+	crdump->snapshot_enable = false;
+
 	/* Create cr-space region */
 	crdump->region_crspace =
 		devlink_region_create(devlink,
--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -191,6 +191,26 @@ static int mlx4_devlink_ierr_reset_set(s
 	return 0;
 }
 
+static int mlx4_devlink_crdump_snapshot_get(struct devlink *devlink, u32 id,
+					    struct devlink_param_gset_ctx *ctx)
+{
+	struct mlx4_priv *priv = devlink_priv(devlink);
+	struct mlx4_dev *dev = &priv->dev;
+
+	ctx->val.vbool = dev->persist->crdump.snapshot_enable;
+	return 0;
+}
+
+static int mlx4_devlink_crdump_snapshot_set(struct devlink *devlink, u32 id,
+					    struct devlink_param_gset_ctx *ctx)
+{
+	struct mlx4_priv *priv = devlink_priv(devlink);
+	struct mlx4_dev *dev = &priv->dev;
+
+	dev->persist->crdump.snapshot_enable = ctx->val.vbool;
+	return 0;
+}
+
 static int
 mlx4_devlink_max_macs_validate(struct devlink *devlink, u32 id,
 			       union devlink_param_value val,
@@ -224,6 +244,11 @@ static const struct devlink_param mlx4_d
 	DEVLINK_PARAM_GENERIC(MAX_MACS,
 			      BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
 			      NULL, NULL, mlx4_devlink_max_macs_validate),
+	DEVLINK_PARAM_GENERIC(REGION_SNAPSHOT,
+			      BIT(DEVLINK_PARAM_CMODE_RUNTIME) |
+			      BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
+			      mlx4_devlink_crdump_snapshot_get,
+			      mlx4_devlink_crdump_snapshot_set, NULL),
 	DEVLINK_PARAM_DRIVER(MLX4_DEVLINK_PARAM_ID_ENABLE_64B_CQE_EQE,
 			     "enable_64b_cqe_eqe", DEVLINK_PARAM_TYPE_BOOL,
 			     BIT(DEVLINK_PARAM_CMODE_DRIVERINIT),
@@ -270,6 +295,11 @@ static void mlx4_devlink_set_params_init
 	mlx4_devlink_set_init_value(devlink,
 				    MLX4_DEVLINK_PARAM_ID_ENABLE_4K_UAR,
 				    value);
+
+	value.vbool = false;
+	mlx4_devlink_set_init_value(devlink,
+				    DEVLINK_PARAM_GENERIC_ID_REGION_SNAPSHOT,
+				    value);
 }
 
 static inline void mlx4_set_num_reserved_uars(struct mlx4_dev *dev,
@@ -3861,6 +3891,9 @@ static int mlx4_devlink_port_type_set(st
 
 static void mlx4_devlink_param_load_driverinit_values(struct devlink *devlink)
 {
+	struct mlx4_priv *priv = devlink_priv(devlink);
+	struct mlx4_dev *dev = &priv->dev;
+	struct mlx4_fw_crdump *crdump = &dev->persist->crdump;
 	union devlink_param_value saved_value;
 	int err;
 
@@ -3888,6 +3921,14 @@ static void mlx4_devlink_param_load_driv
 						 &saved_value);
 	if (!err)
 		enable_4k_uar = saved_value.vbool;
+	err = devlink_param_driverinit_value_get(devlink,
+						 DEVLINK_PARAM_GENERIC_ID_REGION_SNAPSHOT,
+						 &saved_value);
+	if (!err && crdump->snapshot_enable != saved_value.vbool) {
+		crdump->snapshot_enable = saved_value.vbool;
+		devlink_param_value_changed(devlink,
+					    DEVLINK_PARAM_GENERIC_ID_REGION_SNAPSHOT);
+	}
 }
 
 static int mlx4_devlink_reload(struct devlink *devlink,
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -853,6 +853,7 @@ struct mlx4_vf_dev {
 };
 
 struct mlx4_fw_crdump {
+	bool snapshot_enable;
 	struct devlink_region *region_crspace;
 	struct devlink_region *region_fw_health;
 };