tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Intel MIC Platform Software Stack (MPSS)
4 *
5 * Copyright(c) 2015 Intel Corporation.
6 *
7 * Intel MIC Coprocessor State Management (COSM) Driver
8 */
9
10#include <linux/debugfs.h>
11#include <linux/slab.h>
12#include <linux/io.h>
13#include "cosm_main.h"
14
15/* Debugfs parent dir */
16static struct dentry *cosm_dbg;
17
18/**
19 * log_buf_show - Display MIC kernel log buffer
20 *
21 * log_buf addr/len is read from System.map by user space
22 * and populated in sysfs entries.
23 */
24static int log_buf_show(struct seq_file *s, void *unused)
25{
26 void __iomem *log_buf_va;
27 int __iomem *log_buf_len_va;
28 struct cosm_device *cdev = s->private;
29 void *kva;
30 int size;
31 u64 aper_offset;
32
33 if (!cdev || !cdev->log_buf_addr || !cdev->log_buf_len)
34 goto done;
35
36 mutex_lock(&cdev->cosm_mutex);
37 switch (cdev->state) {
38 case MIC_BOOTING:
39 case MIC_ONLINE:
40 case MIC_SHUTTING_DOWN:
41 break;
42 default:
43 goto unlock;
44 }
45
46 /*
47 * Card kernel will never be relocated and any kernel text/data mapping
48 * can be translated to phys address by subtracting __START_KERNEL_map.
49 */
50 aper_offset = (u64)cdev->log_buf_len - __START_KERNEL_map;
51 log_buf_len_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
52 aper_offset = (u64)cdev->log_buf_addr - __START_KERNEL_map;
53 log_buf_va = cdev->hw_ops->aper(cdev)->va + aper_offset;
54
55 size = ioread32(log_buf_len_va);
56 kva = kmalloc(size, GFP_KERNEL);
57 if (!kva)
58 goto unlock;
59
60 memcpy_fromio(kva, log_buf_va, size);
61 seq_write(s, kva, size);
62 kfree(kva);
63unlock:
64 mutex_unlock(&cdev->cosm_mutex);
65done:
66 return 0;
67}
68
69DEFINE_SHOW_ATTRIBUTE(log_buf);
70
71/**
72 * force_reset_show - Force MIC reset
73 *
74 * Invokes the force_reset COSM bus op instead of the standard reset
75 * op in case a force reset of the MIC device is required
76 */
77static int force_reset_show(struct seq_file *s, void *pos)
78{
79 struct cosm_device *cdev = s->private;
80
81 cosm_stop(cdev, true);
82 return 0;
83}
84
85DEFINE_SHOW_ATTRIBUTE(force_reset);
86
87void cosm_create_debug_dir(struct cosm_device *cdev)
88{
89 char name[16];
90
91 if (!cosm_dbg)
92 return;
93
94 scnprintf(name, sizeof(name), "mic%d", cdev->index);
95 cdev->dbg_dir = debugfs_create_dir(name, cosm_dbg);
96
97 debugfs_create_file("log_buf", 0444, cdev->dbg_dir, cdev,
98 &log_buf_fops);
99 debugfs_create_file("force_reset", 0444, cdev->dbg_dir, cdev,
100 &force_reset_fops);
101}
102
103void cosm_delete_debug_dir(struct cosm_device *cdev)
104{
105 if (!cdev->dbg_dir)
106 return;
107
108 debugfs_remove_recursive(cdev->dbg_dir);
109}
110
111void cosm_init_debugfs(void)
112{
113 cosm_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
114}
115
116void cosm_exit_debugfs(void)
117{
118 debugfs_remove(cosm_dbg);
119}