[PATCH RFC net-next 14/19] net/mlx5: Add core dump register access functions

[Eran Ben Elisha <eranbe@mellanox.com>]

From: Moshe Shemesh <moshe@mellanox.com>

Add access functions to core dump register to enable trigger FW core
dump.

Signed-off-by: Moshe Shemesh <moshe@mellanox.com>
---
 .../mellanox/mlx5/core/diag/fw_tracer.c       | 31 +++++++++++++++++++
 include/linux/mlx5/driver.h                   |  1 +
 include/linux/mlx5/mlx5_ifc.h                 | 17 +++++++++-
 3 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
index 6999f4486e9e..d0f8449019af 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
@@ -786,6 +786,37 @@ static void mlx5_fw_tracer_ownership_change(struct work_struct *work)
 	mlx5_fw_tracer_start(tracer);
 }
 
+static int mlx5_fw_tracer_set_core_dump_reg(struct mlx5_core_dev *dev, u32 *in, int size_in)
+{
+	u32 out[MLX5_ST_SZ_DW(core_dump_reg)] = {0};
+
+	if (!MLX5_CAP_DEBUG(dev, core_dump_general) &&
+	    !MLX5_CAP_DEBUG(dev, core_dump_qp))
+		return -EOPNOTSUPP;
+
+	return mlx5_core_access_reg(dev, in, size_in, out, sizeof(out),
+				    MLX5_REG_CORE_DUMP, 0, 1);
+}
+
+int mlx5_fw_tracer_trigger_core_dump_general(struct mlx5_core_dev *dev)
+{
+	struct mlx5_fw_tracer *tracer = dev->tracer;
+	u32 in[MLX5_ST_SZ_DW(core_dump_reg)] = {0};
+	int err;
+
+	if (!MLX5_CAP_DEBUG(dev, core_dump_general) || !tracer)
+		return -EOPNOTSUPP;
+
+	MLX5_SET(core_dump_reg, in, core_dump_type, 0x0);
+
+	err =  mlx5_fw_tracer_set_core_dump_reg(dev, in, sizeof(in));
+	if (err)
+		return err;
+	queue_work(tracer->work_queue, &tracer->handle_traces_work);
+	flush_workqueue(tracer->work_queue);
+	return 0;
+}
+
 /* Create software resources (Buffers, etc ..) */
 struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev)
 {
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 98c17e74fd4d..bedc9bc08963 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -108,6 +108,7 @@ enum {
 	MLX5_REG_FPGA_CAP	 = 0x4022,
 	MLX5_REG_FPGA_CTRL	 = 0x4023,
 	MLX5_REG_FPGA_ACCESS_REG = 0x4024,
+	MLX5_REG_CORE_DUMP	 = 0x402e,
 	MLX5_REG_PCAP		 = 0x5001,
 	MLX5_REG_PMTU		 = 0x5003,
 	MLX5_REG_PTYS		 = 0x5004,
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index 505a5f6cecdf..d1f7d4b2e3eb 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -671,7 +671,9 @@ struct mlx5_ifc_qos_cap_bits {
 };
 
 struct mlx5_ifc_debug_cap_bits {
-	u8         reserved_at_0[0x20];
+	u8         core_dump_general[0x1];
+	u8         core_dump_qp[0x1];
+	u8         reserved_at_2[0x1e];
 
 	u8         reserved_at_20[0x2];
 	u8         stall_detect[0x1];
@@ -2453,6 +2455,7 @@ union mlx5_ifc_hca_cap_union_bits {
 	struct mlx5_ifc_e_switch_cap_bits e_switch_cap;
 	struct mlx5_ifc_vector_calc_cap_bits vector_calc_cap;
 	struct mlx5_ifc_qos_cap_bits qos_cap;
+	struct mlx5_ifc_debug_cap_bits debug_cap;
 	struct mlx5_ifc_fpga_cap_bits fpga_cap;
 	u8         reserved_at_0[0x8000];
 };
@@ -8410,6 +8413,18 @@ struct mlx5_ifc_qcam_reg_bits {
 	u8         reserved_at_1c0[0x80];
 };
 
+struct mlx5_ifc_core_dump_reg_bits {
+	u8         reserved_at_0[0x18];
+	u8         core_dump_type[0x8];
+
+	u8         reserved_at_20[0x30];
+	u8         vhca_id[0x10];
+
+	u8         reserved_at_60[0x8];
+	u8         qpn[0x18];
+	u8         reserved_at_80[0x180];
+};
+
 struct mlx5_ifc_pcap_reg_bits {
 	u8         reserved_at_0[0x8];
 	u8         local_port[0x8];
-- 
2.17.1