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 19 static 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 52 out: 53 up_read(&dev->me_clients_rwsem); 54 return 0; 55 } 56 DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_meclients); 57 58 static 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 } 83 out: 84 mutex_unlock(&dev->device_lock); 85 return 0; 86 } 87 DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_active); 88 89 static 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 } 117 DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_devstate); 118 119 static 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 } 135 136 static 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 */ 148 void 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 */ 162 void 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