1 /*
2 * Intel MIC Platform Software Stack (MPSS)
3 *
4 * Copyright(c) 2015 Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2, as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * The full GNU General Public License is included in this distribution in
16 * the file called "COPYING".
17 *
18 * Intel MIC Coprocessor State Management (COSM) Driver
19 *
20 */
21
22 #include <linux/debugfs.h>
23 #include <linux/slab.h>
24 #include <linux/io.h>
25 #include "cosm_main.h"
26
27 /* Debugfs parent dir */
28 static struct dentry *cosm_dbg;
29
30 /**
31 * cosm_log_buf_show - Display MIC kernel log buffer
32 *
33 * log_buf addr/len is read from System.map by user space
34 * and populated in sysfs entries.
35 */
cosm_log_buf_show(struct seq_file * s,void * unused)36 static int cosm_log_buf_show(struct seq_file *s, void *unused)
37 {
38 void __iomem *log_buf_va;
39 int __iomem *log_buf_len_va;
40 struct cosm_device *cdev = s->private;
41 void *kva;
42 int size;
43 u64 aper_offset;
44
45 if (!cdev || !cdev->log_buf_addr || !cdev->log_buf_len)
46 goto done;
47
48 mutex_lock(&cdev->cosm_mutex);
49 switch (cdev->state) {
50 case MIC_BOOTING:
51 case MIC_ONLINE:
52 case MIC_SHUTTING_DOWN:
53 break;
54 default:
55 goto unlock;
56 }
57
58 /*
59 * Card kernel will never be relocated and any kernel text/data mapping
60 * can be translated to phys address by subtracting __START_KERNEL_map.
61 */
62 aper_offset = (u64)cdev->log_buf_len - __START_KERNEL_map;
63 log_buf_len_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
64 aper_offset = (u64)cdev->log_buf_addr - __START_KERNEL_map;
65 log_buf_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
66
67 size = ioread32(log_buf_len_va);
68 kva = kmalloc(size, GFP_KERNEL);
69 if (!kva)
70 goto unlock;
71
72 memcpy_fromio(kva, log_buf_va, size);
73 seq_write(s, kva, size);
74 kfree(kva);
75 unlock:
76 mutex_unlock(&cdev->cosm_mutex);
77 done:
78 return 0;
79 }
80
cosm_log_buf_open(struct inode * inode,struct file * file)81 static int cosm_log_buf_open(struct inode *inode, struct file *file)
82 {
83 return single_open(file, cosm_log_buf_show, inode->i_private);
84 }
85
86 static const struct file_operations log_buf_ops = {
87 .owner = THIS_MODULE,
88 .open = cosm_log_buf_open,
89 .read = seq_read,
90 .llseek = seq_lseek,
91 .release = single_release
92 };
93
94 /**
95 * cosm_force_reset_show - Force MIC reset
96 *
97 * Invokes the force_reset COSM bus op instead of the standard reset
98 * op in case a force reset of the MIC device is required
99 */
cosm_force_reset_show(struct seq_file * s,void * pos)100 static int cosm_force_reset_show(struct seq_file *s, void *pos)
101 {
102 struct cosm_device *cdev = s->private;
103
104 cosm_stop(cdev, true);
105 return 0;
106 }
107
cosm_force_reset_debug_open(struct inode * inode,struct file * file)108 static int cosm_force_reset_debug_open(struct inode *inode, struct file *file)
109 {
110 return single_open(file, cosm_force_reset_show, inode->i_private);
111 }
112
113 static const struct file_operations force_reset_ops = {
114 .owner = THIS_MODULE,
115 .open = cosm_force_reset_debug_open,
116 .read = seq_read,
117 .llseek = seq_lseek,
118 .release = single_release
119 };
120
cosm_create_debug_dir(struct cosm_device * cdev)121 void cosm_create_debug_dir(struct cosm_device *cdev)
122 {
123 char name[16];
124
125 if (!cosm_dbg)
126 return;
127
128 scnprintf(name, sizeof(name), "mic%d", cdev->index);
129 cdev->dbg_dir = debugfs_create_dir(name, cosm_dbg);
130 if (!cdev->dbg_dir)
131 return;
132
133 debugfs_create_file("log_buf", 0444, cdev->dbg_dir, cdev, &log_buf_ops);
134 debugfs_create_file("force_reset", 0444, cdev->dbg_dir, cdev,
135 &force_reset_ops);
136 }
137
cosm_delete_debug_dir(struct cosm_device * cdev)138 void cosm_delete_debug_dir(struct cosm_device *cdev)
139 {
140 if (!cdev->dbg_dir)
141 return;
142
143 debugfs_remove_recursive(cdev->dbg_dir);
144 }
145
cosm_init_debugfs(void)146 void cosm_init_debugfs(void)
147 {
148 cosm_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
149 if (!cosm_dbg)
150 pr_err("can't create debugfs dir\n");
151 }
152
cosm_exit_debugfs(void)153 void cosm_exit_debugfs(void)
154 {
155 debugfs_remove(cosm_dbg);
156 }
157