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Date:   Mon, 14 Sep 2020 09:07:52 +0300
From:   Moshe Shemesh <moshe@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jiri Pirko <jiri@...lanox.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Moshe Shemesh <moshe@...lanox.com>
Subject: [PATCH net-next RFC v4 05/15] net/mlx5: Add functions to set/query MFRL register

Add functions to query and set the MFRL reset options supported by
firmware.

Signed-off-by: Moshe Shemesh <moshe@...lanox.com>
---
 .../net/ethernet/mellanox/mlx5/core/Makefile  |  2 +-
 .../ethernet/mellanox/mlx5/core/fw_reset.c    | 46 +++++++++++++++++++
 .../ethernet/mellanox/mlx5/core/fw_reset.h    | 13 ++++++
 3 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/fw_reset.h

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
index 9826a041e407..380a51747599 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
+++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
@@ -16,7 +16,7 @@ mlx5_core-y :=	main.o cmd.o debugfs.o fw.o eq.o uar.o pagealloc.o \
 		transobj.o vport.o sriov.o fs_cmd.o fs_core.o pci_irq.o \
 		fs_counters.o rl.o lag.o dev.o events.o wq.o lib/gid.o \
 		lib/devcom.o lib/pci_vsc.o lib/dm.o diag/fs_tracepoint.o \
-		diag/fw_tracer.o diag/crdump.o devlink.o diag/rsc_dump.o
+		diag/fw_tracer.o diag/crdump.o devlink.o diag/rsc_dump.o fw_reset.o
 
 #
 # Netdev basic
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
new file mode 100644
index 000000000000..76d2cece29ac
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+/* Copyright (c) 2020, Mellanox Technologies inc.  All rights reserved. */
+
+#include "fw_reset.h"
+
+static int mlx5_reg_mfrl_set(struct mlx5_core_dev *dev, u8 reset_level,
+			     u8 reset_type_sel, u8 sync_resp, bool sync_start)
+{
+	u32 out[MLX5_ST_SZ_DW(mfrl_reg)] = {};
+	u32 in[MLX5_ST_SZ_DW(mfrl_reg)] = {};
+
+	MLX5_SET(mfrl_reg, in, reset_level, reset_level);
+	MLX5_SET(mfrl_reg, in, rst_type_sel, reset_type_sel);
+	MLX5_SET(mfrl_reg, in, pci_sync_for_fw_update_resp, sync_resp);
+	MLX5_SET(mfrl_reg, in, pci_sync_for_fw_update_start, sync_start);
+
+	return mlx5_core_access_reg(dev, in, sizeof(in), out, sizeof(out), MLX5_REG_MFRL, 0, 1);
+}
+
+int mlx5_reg_mfrl_query(struct mlx5_core_dev *dev, u8 *reset_level, u8 *reset_type)
+{
+	u32 out[MLX5_ST_SZ_DW(mfrl_reg)] = {};
+	u32 in[MLX5_ST_SZ_DW(mfrl_reg)] = {};
+	int err;
+
+	err = mlx5_core_access_reg(dev, in, sizeof(in), out, sizeof(out), MLX5_REG_MFRL, 0, 0);
+	if (err)
+		return err;
+
+	if (reset_level)
+		*reset_level = MLX5_GET(mfrl_reg, out, reset_level);
+	if (reset_type)
+		*reset_type = MLX5_GET(mfrl_reg, out, reset_type);
+
+	return 0;
+}
+
+int mlx5_fw_set_reset_sync(struct mlx5_core_dev *dev, u8 reset_type_sel)
+{
+	return mlx5_reg_mfrl_set(dev, MLX5_MFRL_REG_RESET_LEVEL3, reset_type_sel, 0, true);
+}
+
+int mlx5_fw_set_live_patch(struct mlx5_core_dev *dev)
+{
+	return mlx5_reg_mfrl_set(dev, MLX5_MFRL_REG_RESET_LEVEL0, 0, 0, false);
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.h b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.h
new file mode 100644
index 000000000000..1bbd95182ca6
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fw_reset.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
+/* Copyright (c) 2020, Mellanox Technologies inc.  All rights reserved. */
+
+#ifndef __MLX5_FW_RESET_H
+#define __MLX5_FW_RESET_H
+
+#include "mlx5_core.h"
+
+int mlx5_reg_mfrl_query(struct mlx5_core_dev *dev, u8 *reset_level, u8 *reset_type);
+int mlx5_fw_set_reset_sync(struct mlx5_core_dev *dev, u8 reset_type_sel);
+int mlx5_fw_set_live_patch(struct mlx5_core_dev *dev);
+
+#endif
-- 
2.17.1

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