/* * * Intel Management Engine Interface (Intel MEI) Linux driver * Copyright (c) 2012-2013, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * */ #include <linux/slab.h> #include <linux/kernel.h> #include <linux/device.h> #include <linux/debugfs.h> #include <linux/mei.h> #include "mei_dev.h" #include "client.h" #include "hw.h" static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct mei_device *dev = fp->private_data; struct mei_me_client *me_cl; size_t bufsz = 1; char *buf; int i = 0; int pos = 0; int ret; #define HDR \ " |id|fix| UUID |con|msg len|sb|refc|\n" down_read(&dev->me_clients_rwsem); list_for_each_entry(me_cl, &dev->me_clients, list) bufsz++; bufsz *= sizeof(HDR) + 1; buf = kzalloc(bufsz, GFP_KERNEL); if (!buf) { up_read(&dev->me_clients_rwsem); return -ENOMEM; } pos += scnprintf(buf + pos, bufsz - pos, HDR); #undef HDR /* if the driver is not enabled the list won't be consistent */ if (dev->dev_state != MEI_DEV_ENABLED) goto out; list_for_each_entry(me_cl, &dev->me_clients, list) { if (mei_me_cl_get(me_cl)) { pos += scnprintf(buf + pos, bufsz - pos, "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n", i++, me_cl->client_id, me_cl->props.fixed_address, &me_cl->props.protocol_name, me_cl->props.max_number_of_connections, me_cl->props.max_msg_length, me_cl->props.single_recv_buf, atomic_read(&me_cl->refcnt.refcount)); mei_me_cl_put(me_cl); } } out: up_read(&dev->me_clients_rwsem); ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); kfree(buf); return ret; } static const struct file_operations mei_dbgfs_fops_meclients = { .open = simple_open, .read = mei_dbgfs_read_meclients, .llseek = generic_file_llseek, }; static ssize_t mei_dbgfs_read_active(struct file *fp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct mei_device *dev = fp->private_data; struct mei_cl *cl; size_t bufsz = 1; char *buf; int i = 0; int pos = 0; int ret; #define HDR " |me|host|state|rd|wr|\n" if (!dev) return -ENODEV; mutex_lock(&dev->device_lock); /* * if the driver is not enabled the list won't be consistent, * we output empty table */ if (dev->dev_state == MEI_DEV_ENABLED) list_for_each_entry(cl, &dev->file_list, link) bufsz++; bufsz *= sizeof(HDR) + 1; buf = kzalloc(bufsz, GFP_KERNEL); if (!buf) { mutex_unlock(&dev->device_lock); return -ENOMEM; } pos += scnprintf(buf + pos, bufsz - pos, HDR); #undef HDR /* if the driver is not enabled the list won't be consistent */ if (dev->dev_state != MEI_DEV_ENABLED) goto out; list_for_each_entry(cl, &dev->file_list, link) { pos += scnprintf(buf + pos, bufsz - pos, "%3d|%2d|%4d|%5d|%2d|%2d|\n", i, mei_cl_me_id(cl), cl->host_client_id, cl->state, !list_empty(&cl->rd_completed), cl->writing_state); i++; } out: mutex_unlock(&dev->device_lock); ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); kfree(buf); return ret; } static const struct file_operations mei_dbgfs_fops_active = { .open = simple_open, .read = mei_dbgfs_read_active, .llseek = generic_file_llseek, }; static ssize_t mei_dbgfs_read_devstate(struct file *fp, char __user *ubuf, size_t cnt, loff_t *ppos) { struct mei_device *dev = fp->private_data; const size_t bufsz = 1024; char *buf = kzalloc(bufsz, GFP_KERNEL); int pos = 0; int ret; if (!buf) return -ENOMEM; pos += scnprintf(buf + pos, bufsz - pos, "dev: %s\n", mei_dev_state_str(dev->dev_state)); pos += scnprintf(buf + pos, bufsz - pos, "hbm: %s\n", mei_hbm_state_str(dev->hbm_state)); if (dev->hbm_state == MEI_HBM_STARTED) { pos += scnprintf(buf + pos, bufsz - pos, "hbm features:\n"); pos += scnprintf(buf + pos, bufsz - pos, "\tPG: %01d\n", dev->hbm_f_pg_supported); pos += scnprintf(buf + pos, bufsz - pos, "\tDC: %01d\n", dev->hbm_f_dc_supported); pos += scnprintf(buf + pos, bufsz - pos, "\tDOT: %01d\n", dev->hbm_f_dot_supported); pos += scnprintf(buf + pos, bufsz - pos, "\tEV: %01d\n", dev->hbm_f_ev_supported); } pos += scnprintf(buf + pos, bufsz - pos, "pg: %s, %s\n", mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED", mei_pg_state_str(mei_pg_state(dev))); ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos); kfree(buf); return ret; } static const struct file_operations mei_dbgfs_fops_devstate = { .open = simple_open, .read = mei_dbgfs_read_devstate, .llseek = generic_file_llseek, }; /** * mei_dbgfs_deregister - Remove the debugfs files and directories * * @dev: the mei device structure */ void mei_dbgfs_deregister(struct mei_device *dev) { if (!dev->dbgfs_dir) return; debugfs_remove_recursive(dev->dbgfs_dir); dev->dbgfs_dir = NULL; } /** * mei_dbgfs_register - Add the debugfs files * * @dev: the mei device structure * @name: the mei device name * * Return: 0 on success, <0 on failure. */ int mei_dbgfs_register(struct mei_device *dev, const char *name) { struct dentry *dir, *f; dir = debugfs_create_dir(name, NULL); if (!dir) return -ENOMEM; dev->dbgfs_dir = dir; f = debugfs_create_file("meclients", S_IRUSR, dir, dev, &mei_dbgfs_fops_meclients); if (!f) { dev_err(dev->dev, "meclients: registration failed\n"); goto err; } f = debugfs_create_file("active", S_IRUSR, dir, dev, &mei_dbgfs_fops_active); if (!f) { dev_err(dev->dev, "active: registration failed\n"); goto err; } f = debugfs_create_file("devstate", S_IRUSR, dir, dev, &mei_dbgfs_fops_devstate); if (!f) { dev_err(dev->dev, "devstate: registration failed\n"); goto err; } f = debugfs_create_bool("allow_fixed_address", S_IRUSR | S_IWUSR, dir, &dev->allow_fixed_address); if (!f) { dev_err(dev->dev, "allow_fixed_address: registration failed\n"); goto err; } return 0; err: mei_dbgfs_deregister(dev); return -ENODEV; }