linux/drivers/misc/mei/debugfs.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2012-2016, Intel Corporation. All rights reserved
   4 * Intel Management Engine Interface (Intel MEI) Linux driver
   5 */
   6
   7#include <linux/slab.h>
   8#include <linux/kernel.h>
   9#include <linux/device.h>
  10#include <linux/debugfs.h>
  11#include <linux/seq_file.h>
  12
  13#include <linux/mei.h>
  14
  15#include "mei_dev.h"
  16#include "client.h"
  17#include "hw.h"
  18
  19static int mei_dbgfs_meclients_show(struct seq_file *m, void *unused)
  20{
  21        struct mei_device *dev = m->private;
  22        struct mei_me_client *me_cl;
  23        int i = 0;
  24
  25        if (!dev)
  26                return -ENODEV;
  27
  28        down_read(&dev->me_clients_rwsem);
  29
  30        seq_puts(m, "  |id|fix|         UUID                       |con|msg len|sb|refc|vt|\n");
  31
  32        /*  if the driver is not enabled the list won't be consistent */
  33        if (dev->dev_state != MEI_DEV_ENABLED)
  34                goto out;
  35
  36        list_for_each_entry(me_cl, &dev->me_clients, list) {
  37                if (!mei_me_cl_get(me_cl))
  38                        continue;
  39
  40                seq_printf(m, "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|%2d|\n",
  41                           i++, me_cl->client_id,
  42                           me_cl->props.fixed_address,
  43                           &me_cl->props.protocol_name,
  44                           me_cl->props.max_number_of_connections,
  45                           me_cl->props.max_msg_length,
  46                           me_cl->props.single_recv_buf,
  47                           kref_read(&me_cl->refcnt),
  48                           me_cl->props.vt_supported);
  49                mei_me_cl_put(me_cl);
  50        }
  51
  52out:
  53        up_read(&dev->me_clients_rwsem);
  54        return 0;
  55}
  56DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_meclients);
  57
  58static int mei_dbgfs_active_show(struct seq_file *m, void *unused)
  59{
  60        struct mei_device *dev = m->private;
  61        struct mei_cl *cl;
  62        int i = 0;
  63
  64        if (!dev)
  65                return -ENODEV;
  66
  67        mutex_lock(&dev->device_lock);
  68
  69        seq_puts(m, "   |me|host|state|rd|wr|wrq\n");
  70
  71        /*  if the driver is not enabled the list won't be consistent */
  72        if (dev->dev_state != MEI_DEV_ENABLED)
  73                goto out;
  74
  75        list_for_each_entry(cl, &dev->file_list, link) {
  76
  77                seq_printf(m, "%3d|%2d|%4d|%5d|%2d|%2d|%3u\n",
  78                           i, mei_cl_me_id(cl), cl->host_client_id, cl->state,
  79                           !list_empty(&cl->rd_completed), cl->writing_state,
  80                           cl->tx_cb_queued);
  81                i++;
  82        }
  83out:
  84        mutex_unlock(&dev->device_lock);
  85        return 0;
  86}
  87DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_active);
  88
  89static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused)
  90{
  91        struct mei_device *dev = m->private;
  92
  93        seq_printf(m, "dev: %s\n", mei_dev_state_str(dev->dev_state));
  94        seq_printf(m, "hbm: %s\n", mei_hbm_state_str(dev->hbm_state));
  95
  96        if (dev->hbm_state >= MEI_HBM_ENUM_CLIENTS &&
  97            dev->hbm_state <= MEI_HBM_STARTED) {
  98                seq_puts(m, "hbm features:\n");
  99                seq_printf(m, "\tPG: %01d\n", dev->hbm_f_pg_supported);
 100                seq_printf(m, "\tDC: %01d\n", dev->hbm_f_dc_supported);
 101                seq_printf(m, "\tIE: %01d\n", dev->hbm_f_ie_supported);
 102                seq_printf(m, "\tDOT: %01d\n", dev->hbm_f_dot_supported);
 103                seq_printf(m, "\tEV: %01d\n", dev->hbm_f_ev_supported);
 104                seq_printf(m, "\tFA: %01d\n", dev->hbm_f_fa_supported);
 105                seq_printf(m, "\tOS: %01d\n", dev->hbm_f_os_supported);
 106                seq_printf(m, "\tDR: %01d\n", dev->hbm_f_dr_supported);
 107                seq_printf(m, "\tVT: %01d\n", dev->hbm_f_vt_supported);
 108                seq_printf(m, "\tCAP: %01d\n", dev->hbm_f_cap_supported);
 109                seq_printf(m, "\tCD: %01d\n", dev->hbm_f_cd_supported);
 110        }
 111
 112        seq_printf(m, "pg:  %s, %s\n",
 113                   mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
 114                   mei_pg_state_str(mei_pg_state(dev)));
 115        return 0;
 116}
 117DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_devstate);
 118
 119static ssize_t mei_dbgfs_write_allow_fa(struct file *file,
 120                                        const char __user *user_buf,
 121                                        size_t count, loff_t *ppos)
 122{
 123        struct mei_device *dev;
 124        int ret;
 125
 126        dev = container_of(file->private_data,
 127                           struct mei_device, allow_fixed_address);
 128
 129        ret = debugfs_write_file_bool(file, user_buf, count, ppos);
 130        if (ret < 0)
 131                return ret;
 132        dev->override_fixed_address = true;
 133        return ret;
 134}
 135
 136static const struct file_operations mei_dbgfs_allow_fa_fops = {
 137        .open = simple_open,
 138        .read = debugfs_read_file_bool,
 139        .write = mei_dbgfs_write_allow_fa,
 140        .llseek = generic_file_llseek,
 141};
 142
 143/**
 144 * mei_dbgfs_deregister - Remove the debugfs files and directories
 145 *
 146 * @dev: the mei device structure
 147 */
 148void mei_dbgfs_deregister(struct mei_device *dev)
 149{
 150        if (!dev->dbgfs_dir)
 151                return;
 152        debugfs_remove_recursive(dev->dbgfs_dir);
 153        dev->dbgfs_dir = NULL;
 154}
 155
 156/**
 157 * mei_dbgfs_register - Add the debugfs files
 158 *
 159 * @dev: the mei device structure
 160 * @name: the mei device name
 161 */
 162void mei_dbgfs_register(struct mei_device *dev, const char *name)
 163{
 164        struct dentry *dir;
 165
 166        dir = debugfs_create_dir(name, NULL);
 167        dev->dbgfs_dir = dir;
 168
 169        debugfs_create_file("meclients", S_IRUSR, dir, dev,
 170                            &mei_dbgfs_meclients_fops);
 171        debugfs_create_file("active", S_IRUSR, dir, dev,
 172                            &mei_dbgfs_active_fops);
 173        debugfs_create_file("devstate", S_IRUSR, dir, dev,
 174                            &mei_dbgfs_devstate_fops);
 175        debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir,
 176                            &dev->allow_fixed_address,
 177                            &mei_dbgfs_allow_fa_fops);
 178}
 179