cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sense.c (4126B)

      1/*
      2 * Copyright (c) 2007 Mellanox Technologies. All rights reserved.
      3 *
      4 * This software is available to you under a choice of one of two
      5 * 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.
     31 *
     32 */
     33
     34#include <linux/errno.h>
     35#include <linux/if_ether.h>
     36
     37#include <linux/mlx4/cmd.h>
     38
     39#include "mlx4.h"
     40
     41int mlx4_SENSE_PORT(struct mlx4_dev *dev, int port,
     42		    enum mlx4_port_type *type)
     43{
     44	u64 out_param;
     45	int err = 0;
     46
     47	err = mlx4_cmd_imm(dev, 0, &out_param, port, 0,
     48			   MLX4_CMD_SENSE_PORT, MLX4_CMD_TIME_CLASS_B,
     49			   MLX4_CMD_WRAPPED);
     50	if (err) {
     51		mlx4_err(dev, "Sense command failed for port: %d\n", port);
     52		return err;
     53	}
     54
     55	if (out_param > 2) {
     56		mlx4_err(dev, "Sense returned illegal value: 0x%llx\n", out_param);
     57		return -EINVAL;
     58	}
     59
     60	*type = out_param;
     61	return 0;
     62}
     63
     64void mlx4_do_sense_ports(struct mlx4_dev *dev,
     65			 enum mlx4_port_type *stype,
     66			 enum mlx4_port_type *defaults)
     67{
     68	struct mlx4_sense *sense = &mlx4_priv(dev)->sense;
     69	int err;
     70	int i;
     71
     72	for (i = 1; i <= dev->caps.num_ports; i++) {
     73		stype[i - 1] = 0;
     74		if (sense->do_sense_port[i] && sense->sense_allowed[i] &&
     75		    dev->caps.possible_type[i] == MLX4_PORT_TYPE_AUTO) {
     76			err = mlx4_SENSE_PORT(dev, i, &stype[i - 1]);
     77			if (err)
     78				stype[i - 1] = defaults[i - 1];
     79		} else
     80			stype[i - 1] = defaults[i - 1];
     81	}
     82
     83	/*
     84	 * If sensed nothing, remain in current configuration.
     85	 */
     86	for (i = 0; i < dev->caps.num_ports; i++)
     87		stype[i] = stype[i] ? stype[i] : defaults[i];
     88
     89}
     90
     91static void mlx4_sense_port(struct work_struct *work)
     92{
     93	struct delayed_work *delay = to_delayed_work(work);
     94	struct mlx4_sense *sense = container_of(delay, struct mlx4_sense,
     95						sense_poll);
     96	struct mlx4_dev *dev = sense->dev;
     97	struct mlx4_priv *priv = mlx4_priv(dev);
     98	enum mlx4_port_type stype[MLX4_MAX_PORTS];
     99
    100	mutex_lock(&priv->port_mutex);
    101	mlx4_do_sense_ports(dev, stype, &dev->caps.port_type[1]);
    102
    103	if (mlx4_check_port_params(dev, stype))
    104		goto sense_again;
    105
    106	if (mlx4_change_port_types(dev, stype))
    107		mlx4_err(dev, "Failed to change port_types\n");
    108
    109sense_again:
    110	mutex_unlock(&priv->port_mutex);
    111	queue_delayed_work(mlx4_wq , &sense->sense_poll,
    112			   round_jiffies_relative(MLX4_SENSE_RANGE));
    113}
    114
    115void mlx4_start_sense(struct mlx4_dev *dev)
    116{
    117	struct mlx4_priv *priv = mlx4_priv(dev);
    118	struct mlx4_sense *sense = &priv->sense;
    119
    120	if (!(dev->caps.flags & MLX4_DEV_CAP_FLAG_DPDP))
    121		return;
    122
    123	queue_delayed_work(mlx4_wq , &sense->sense_poll,
    124			   round_jiffies_relative(MLX4_SENSE_RANGE));
    125}
    126
    127void mlx4_stop_sense(struct mlx4_dev *dev)
    128{
    129	cancel_delayed_work_sync(&mlx4_priv(dev)->sense.sense_poll);
    130}
    131
    132void  mlx4_sense_init(struct mlx4_dev *dev)
    133{
    134	struct mlx4_priv *priv = mlx4_priv(dev);
    135	struct mlx4_sense *sense = &priv->sense;
    136	int port;
    137
    138	sense->dev = dev;
    139	for (port = 1; port <= dev->caps.num_ports; port++)
    140		sense->do_sense_port[port] = 1;
    141
    142	INIT_DEFERRABLE_WORK(&sense->sense_poll, mlx4_sense_port);
    143}