xref: /openbmc/linux/drivers/misc/mei/debugfs.c (revision 57e4f155)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2012-2022, 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 
mei_dbgfs_meclients_show(struct seq_file * m,void * unused)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 
mei_dbgfs_active_show(struct seq_file * m,void * unused)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 
mei_dev_pxp_mode_str(enum mei_dev_pxp_mode state)89 static const char *mei_dev_pxp_mode_str(enum mei_dev_pxp_mode state)
90 {
91 #define MEI_PXP_MODE(state) case MEI_DEV_PXP_##state: return #state
92 	switch (state) {
93 	MEI_PXP_MODE(DEFAULT);
94 	MEI_PXP_MODE(INIT);
95 	MEI_PXP_MODE(SETUP);
96 	MEI_PXP_MODE(READY);
97 	default:
98 		return "unknown";
99 	}
100 #undef MEI_PXP_MODE
101 }
102 
mei_dbgfs_devstate_show(struct seq_file * m,void * unused)103 static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused)
104 {
105 	struct mei_device *dev = m->private;
106 
107 	seq_printf(m, "dev: %s\n", mei_dev_state_str(dev->dev_state));
108 	seq_printf(m, "hbm: %s\n", mei_hbm_state_str(dev->hbm_state));
109 
110 	if (dev->hbm_state >= MEI_HBM_ENUM_CLIENTS &&
111 	    dev->hbm_state <= MEI_HBM_STARTED) {
112 		seq_puts(m, "hbm features:\n");
113 		seq_printf(m, "\tPG: %01d\n", dev->hbm_f_pg_supported);
114 		seq_printf(m, "\tDC: %01d\n", dev->hbm_f_dc_supported);
115 		seq_printf(m, "\tIE: %01d\n", dev->hbm_f_ie_supported);
116 		seq_printf(m, "\tDOT: %01d\n", dev->hbm_f_dot_supported);
117 		seq_printf(m, "\tEV: %01d\n", dev->hbm_f_ev_supported);
118 		seq_printf(m, "\tFA: %01d\n", dev->hbm_f_fa_supported);
119 		seq_printf(m, "\tOS: %01d\n", dev->hbm_f_os_supported);
120 		seq_printf(m, "\tDR: %01d\n", dev->hbm_f_dr_supported);
121 		seq_printf(m, "\tVT: %01d\n", dev->hbm_f_vt_supported);
122 		seq_printf(m, "\tCAP: %01d\n", dev->hbm_f_cap_supported);
123 		seq_printf(m, "\tCD: %01d\n", dev->hbm_f_cd_supported);
124 	}
125 
126 	seq_printf(m, "pg:  %s, %s\n",
127 		   mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
128 		   mei_pg_state_str(mei_pg_state(dev)));
129 
130 	seq_printf(m, "pxp: %s\n", mei_dev_pxp_mode_str(dev->pxp_mode));
131 
132 	return 0;
133 }
134 DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_devstate);
135 
mei_dbgfs_write_allow_fa(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)136 static ssize_t mei_dbgfs_write_allow_fa(struct file *file,
137 					const char __user *user_buf,
138 					size_t count, loff_t *ppos)
139 {
140 	struct mei_device *dev;
141 	int ret;
142 
143 	dev = container_of(file->private_data,
144 			   struct mei_device, allow_fixed_address);
145 
146 	ret = debugfs_write_file_bool(file, user_buf, count, ppos);
147 	if (ret < 0)
148 		return ret;
149 	dev->override_fixed_address = true;
150 	return ret;
151 }
152 
153 static const struct file_operations mei_dbgfs_allow_fa_fops = {
154 	.open = simple_open,
155 	.read = debugfs_read_file_bool,
156 	.write = mei_dbgfs_write_allow_fa,
157 	.llseek = generic_file_llseek,
158 };
159 
160 /**
161  * mei_dbgfs_deregister - Remove the debugfs files and directories
162  *
163  * @dev: the mei device structure
164  */
mei_dbgfs_deregister(struct mei_device * dev)165 void mei_dbgfs_deregister(struct mei_device *dev)
166 {
167 	if (!dev->dbgfs_dir)
168 		return;
169 	debugfs_remove_recursive(dev->dbgfs_dir);
170 	dev->dbgfs_dir = NULL;
171 }
172 
173 /**
174  * mei_dbgfs_register - Add the debugfs files
175  *
176  * @dev: the mei device structure
177  * @name: the mei device name
178  */
mei_dbgfs_register(struct mei_device * dev,const char * name)179 void mei_dbgfs_register(struct mei_device *dev, const char *name)
180 {
181 	struct dentry *dir;
182 
183 	dir = debugfs_create_dir(name, NULL);
184 	dev->dbgfs_dir = dir;
185 
186 	debugfs_create_file("meclients", S_IRUSR, dir, dev,
187 			    &mei_dbgfs_meclients_fops);
188 	debugfs_create_file("active", S_IRUSR, dir, dev,
189 			    &mei_dbgfs_active_fops);
190 	debugfs_create_file("devstate", S_IRUSR, dir, dev,
191 			    &mei_dbgfs_devstate_fops);
192 	debugfs_create_file("allow_fixed_address", S_IRUSR | S_IWUSR, dir,
193 			    &dev->allow_fixed_address,
194 			    &mei_dbgfs_allow_fa_fops);
195 }
196