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ferasdSaeed Mahameed
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Saeed Mahameed
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net/mlx5: FW tracer, implement tracer logic
Implement FW tracer logic and registers access, initialization and cleanup flows. Initializing the tracer will be part of load one flow, as multiple PFs will try to acquire ownership but only one will succeed and will be the tracer owner. Signed-off-by: Feras Daoud <[email protected]> Signed-off-by: Saeed Mahameed <[email protected]>
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‎drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c

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/*
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* Copyright (c) 2018, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "fw_tracer.h"
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static int mlx5_query_mtrc_caps(struct mlx5_fw_tracer *tracer)
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{
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u32 *string_db_base_address_out = tracer->str_db.base_address_out;
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u32 *string_db_size_out = tracer->str_db.size_out;
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struct mlx5_core_dev *dev = tracer->dev;
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u32 out[MLX5_ST_SZ_DW(mtrc_cap)] = {0};
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u32 in[MLX5_ST_SZ_DW(mtrc_cap)] = {0};
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void *mtrc_cap_sp;
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int err, i;
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err = mlx5_core_access_reg(dev, in, sizeof(in), out, sizeof(out),
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MLX5_REG_MTRC_CAP, 0, 0);
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if (err) {
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mlx5_core_warn(dev, "FWTracer: Error reading tracer caps %d\n",
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err);
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return err;
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}
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if (!MLX5_GET(mtrc_cap, out, trace_to_memory)) {
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mlx5_core_dbg(dev, "FWTracer: Device does not support logging traces to memory\n");
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return -ENOTSUPP;
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}
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tracer->trc_ver = MLX5_GET(mtrc_cap, out, trc_ver);
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tracer->str_db.first_string_trace =
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MLX5_GET(mtrc_cap, out, first_string_trace);
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tracer->str_db.num_string_trace =
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MLX5_GET(mtrc_cap, out, num_string_trace);
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tracer->str_db.num_string_db = MLX5_GET(mtrc_cap, out, num_string_db);
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tracer->owner = !!MLX5_GET(mtrc_cap, out, trace_owner);
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for (i = 0; i < tracer->str_db.num_string_db; i++) {
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mtrc_cap_sp = MLX5_ADDR_OF(mtrc_cap, out, string_db_param[i]);
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string_db_base_address_out[i] = MLX5_GET(mtrc_string_db_param,
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mtrc_cap_sp,
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string_db_base_address);
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string_db_size_out[i] = MLX5_GET(mtrc_string_db_param,
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mtrc_cap_sp, string_db_size);
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}
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return err;
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}
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static int mlx5_set_mtrc_caps_trace_owner(struct mlx5_fw_tracer *tracer,
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u32 *out, u32 out_size,
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u8 trace_owner)
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{
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struct mlx5_core_dev *dev = tracer->dev;
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u32 in[MLX5_ST_SZ_DW(mtrc_cap)] = {0};
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MLX5_SET(mtrc_cap, in, trace_owner, trace_owner);
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return mlx5_core_access_reg(dev, in, sizeof(in), out, out_size,
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MLX5_REG_MTRC_CAP, 0, 1);
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}
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static int mlx5_fw_tracer_ownership_acquire(struct mlx5_fw_tracer *tracer)
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{
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struct mlx5_core_dev *dev = tracer->dev;
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u32 out[MLX5_ST_SZ_DW(mtrc_cap)] = {0};
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int err;
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err = mlx5_set_mtrc_caps_trace_owner(tracer, out, sizeof(out),
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MLX5_FW_TRACER_ACQUIRE_OWNERSHIP);
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if (err) {
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mlx5_core_warn(dev, "FWTracer: Acquire tracer ownership failed %d\n",
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err);
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return err;
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}
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tracer->owner = !!MLX5_GET(mtrc_cap, out, trace_owner);
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if (!tracer->owner)
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return -EBUSY;
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return 0;
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}
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static void mlx5_fw_tracer_ownership_release(struct mlx5_fw_tracer *tracer)
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{
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u32 out[MLX5_ST_SZ_DW(mtrc_cap)] = {0};
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mlx5_set_mtrc_caps_trace_owner(tracer, out, sizeof(out),
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MLX5_FW_TRACER_RELEASE_OWNERSHIP);
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tracer->owner = false;
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}
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static void mlx5_fw_tracer_ownership_change(struct work_struct *work)
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{
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struct mlx5_fw_tracer *tracer = container_of(work, struct mlx5_fw_tracer,
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ownership_change_work);
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struct mlx5_core_dev *dev = tracer->dev;
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int err;
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if (tracer->owner) {
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mlx5_fw_tracer_ownership_release(tracer);
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return;
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}
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err = mlx5_fw_tracer_ownership_acquire(tracer);
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if (err) {
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mlx5_core_dbg(dev, "FWTracer: Ownership was not granted %d\n", err);
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return;
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}
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}
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struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev)
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{
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struct mlx5_fw_tracer *tracer = NULL;
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int err;
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if (!MLX5_CAP_MCAM_REG(dev, tracer_registers)) {
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mlx5_core_dbg(dev, "FWTracer: Tracer capability not present\n");
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return NULL;
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}
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tracer = kzalloc(sizeof(*tracer), GFP_KERNEL);
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if (!tracer)
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return ERR_PTR(-ENOMEM);
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tracer->work_queue = create_singlethread_workqueue("mlx5_fw_tracer");
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if (!tracer->work_queue) {
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err = -ENOMEM;
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goto free_tracer;
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}
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tracer->dev = dev;
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INIT_WORK(&tracer->ownership_change_work, mlx5_fw_tracer_ownership_change);
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err = mlx5_query_mtrc_caps(tracer);
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if (err) {
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mlx5_core_dbg(dev, "FWTracer: Failed to query capabilities %d\n", err);
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goto destroy_workqueue;
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}
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mlx5_fw_tracer_ownership_change(&tracer->ownership_change_work);
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return tracer;
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destroy_workqueue:
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tracer->dev = NULL;
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destroy_workqueue(tracer->work_queue);
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free_tracer:
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kfree(tracer);
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return ERR_PTR(err);
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}
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void mlx5_fw_tracer_destroy(struct mlx5_fw_tracer *tracer)
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{
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if (!tracer)
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return;
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cancel_work_sync(&tracer->ownership_change_work);
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if (tracer->owner)
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mlx5_fw_tracer_ownership_release(tracer);
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flush_workqueue(tracer->work_queue);
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destroy_workqueue(tracer->work_queue);
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kfree(tracer);
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}

‎drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.h

Lines changed: 66 additions & 0 deletions
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/*
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* Copyright (c) 2018, Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
6+
* General Public License (GPL) Version 2, available from the file
7+
* COPYING in the main directory of this source tree, or the
8+
* OpenIB.org BSD license below:
9+
*
10+
* Redistribution and use in source and binary forms, with or
11+
* without modification, are permitted provided that the following
12+
* conditions are met:
13+
*
14+
* - Redistributions of source code must retain the above
15+
* copyright notice, this list of conditions and the following
16+
* disclaimer.
17+
*
18+
* - Redistributions in binary form must reproduce the above
19+
* copyright notice, this list of conditions and the following
20+
* disclaimer in the documentation and/or other materials
21+
* provided with the distribution.
22+
*
23+
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24+
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25+
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26+
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27+
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28+
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29+
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30+
* SOFTWARE.
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*/
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#ifndef __LIB_TRACER_H__
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#define __LIB_TRACER_H__
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#include <linux/mlx5/driver.h>
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#include "mlx5_core.h"
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#define STRINGS_DB_SECTIONS_NUM 8
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struct mlx5_fw_tracer {
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struct mlx5_core_dev *dev;
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bool owner;
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u8 trc_ver;
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struct workqueue_struct *work_queue;
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struct work_struct ownership_change_work;
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/* Strings DB */
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struct {
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u8 first_string_trace;
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u8 num_string_trace;
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u32 num_string_db;
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u32 base_address_out[STRINGS_DB_SECTIONS_NUM];
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u32 size_out[STRINGS_DB_SECTIONS_NUM];
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} str_db;
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};
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enum mlx5_fw_tracer_ownership_state {
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MLX5_FW_TRACER_RELEASE_OWNERSHIP,
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MLX5_FW_TRACER_ACQUIRE_OWNERSHIP,
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};
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struct mlx5_fw_tracer *mlx5_fw_tracer_create(struct mlx5_core_dev *dev);
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void mlx5_fw_tracer_destroy(struct mlx5_fw_tracer *tracer);
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#endif

‎include/linux/mlx5/driver.h

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@@ -816,6 +816,8 @@ struct mlx5_clock {
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struct mlx5_pps pps_info;
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};
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struct mlx5_fw_tracer;
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struct mlx5_core_dev {
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struct pci_dev *pdev;
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/* sync pci state */
@@ -860,6 +862,7 @@ struct mlx5_core_dev {
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struct mlx5_clock clock;
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struct mlx5_ib_clock_info *clock_info;
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struct page *clock_info_page;
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struct mlx5_fw_tracer *tracer;
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};
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struct mlx5_db {

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