Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright 2011 Tilera Corporation. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
12 * more details.
13 *
14 * /sys entry support.
15 */
16
17#include <linux/device.h>
18#include <linux/cpu.h>
19#include <linux/slab.h>
20#include <linux/smp.h>
21#include <linux/stat.h>
22#include <hv/hypervisor.h>
23
24/* Return a string queried from the hypervisor, truncated to page size. */
25static ssize_t get_hv_confstr(char *page, int query)
26{
27 ssize_t n = hv_confstr(query, (unsigned long)page, PAGE_SIZE - 1);
28 n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1) - 1;
29 if (n)
30 page[n++] = '\n';
31 page[n] = '\0';
32 return n;
33}
34
35static ssize_t chip_width_show(struct device *dev,
36 struct device_attribute *attr,
37 char *page)
38{
39 return sprintf(page, "%u\n", smp_width);
40}
41static DEVICE_ATTR(chip_width, 0444, chip_width_show, NULL);
42
43static ssize_t chip_height_show(struct device *dev,
44 struct device_attribute *attr,
45 char *page)
46{
47 return sprintf(page, "%u\n", smp_height);
48}
49static DEVICE_ATTR(chip_height, 0444, chip_height_show, NULL);
50
51static ssize_t chip_serial_show(struct device *dev,
52 struct device_attribute *attr,
53 char *page)
54{
55 return get_hv_confstr(page, HV_CONFSTR_CHIP_SERIAL_NUM);
56}
57static DEVICE_ATTR(chip_serial, 0444, chip_serial_show, NULL);
58
59static ssize_t chip_revision_show(struct device *dev,
60 struct device_attribute *attr,
61 char *page)
62{
63 return get_hv_confstr(page, HV_CONFSTR_CHIP_REV);
64}
65static DEVICE_ATTR(chip_revision, 0444, chip_revision_show, NULL);
66
67
68static ssize_t type_show(struct device *dev,
69 struct device_attribute *attr,
70 char *page)
71{
72 return sprintf(page, "tilera\n");
73}
74static DEVICE_ATTR(type, 0444, type_show, NULL);
75
76#define HV_CONF_ATTR(name, conf) \
77 static ssize_t name ## _show(struct device *dev, \
78 struct device_attribute *attr, \
79 char *page) \
80 { \
81 return get_hv_confstr(page, conf); \
82 } \
83 static DEVICE_ATTR(name, 0444, name ## _show, NULL);
84
85HV_CONF_ATTR(version, HV_CONFSTR_HV_SW_VER)
86HV_CONF_ATTR(config_version, HV_CONFSTR_HV_CONFIG_VER)
87
88HV_CONF_ATTR(board_part, HV_CONFSTR_BOARD_PART_NUM)
89HV_CONF_ATTR(board_serial, HV_CONFSTR_BOARD_SERIAL_NUM)
90HV_CONF_ATTR(board_revision, HV_CONFSTR_BOARD_REV)
91HV_CONF_ATTR(board_description, HV_CONFSTR_BOARD_DESC)
92HV_CONF_ATTR(mezz_part, HV_CONFSTR_MEZZ_PART_NUM)
93HV_CONF_ATTR(mezz_serial, HV_CONFSTR_MEZZ_SERIAL_NUM)
94HV_CONF_ATTR(mezz_revision, HV_CONFSTR_MEZZ_REV)
95HV_CONF_ATTR(mezz_description, HV_CONFSTR_MEZZ_DESC)
96HV_CONF_ATTR(cpumod_part, HV_CONFSTR_CPUMOD_PART_NUM)
97HV_CONF_ATTR(cpumod_serial, HV_CONFSTR_CPUMOD_SERIAL_NUM)
98HV_CONF_ATTR(cpumod_revision, HV_CONFSTR_CPUMOD_REV)
99HV_CONF_ATTR(cpumod_description,HV_CONFSTR_CPUMOD_DESC)
100HV_CONF_ATTR(switch_control, HV_CONFSTR_SWITCH_CONTROL)
101
102static struct attribute *board_attrs[] = {
103 &dev_attr_board_part.attr,
104 &dev_attr_board_serial.attr,
105 &dev_attr_board_revision.attr,
106 &dev_attr_board_description.attr,
107 &dev_attr_mezz_part.attr,
108 &dev_attr_mezz_serial.attr,
109 &dev_attr_mezz_revision.attr,
110 &dev_attr_mezz_description.attr,
111 &dev_attr_cpumod_part.attr,
112 &dev_attr_cpumod_serial.attr,
113 &dev_attr_cpumod_revision.attr,
114 &dev_attr_cpumod_description.attr,
115 &dev_attr_switch_control.attr,
116 NULL
117};
118
119static struct attribute_group board_attr_group = {
120 .name = "board",
121 .attrs = board_attrs,
122};
123
124
125static struct bin_attribute hvconfig_bin;
126
127static ssize_t
128hvconfig_bin_read(struct file *filp, struct kobject *kobj,
129 struct bin_attribute *bin_attr,
130 char *buf, loff_t off, size_t count)
131{
132 static size_t size;
133
134 /* Lazily learn the true size (minus the trailing NUL). */
135 if (size == 0)
136 size = hv_confstr(HV_CONFSTR_HV_CONFIG, 0, 0) - 1;
137
138 /* Check and adjust input parameters. */
139 if (off > size)
140 return -EINVAL;
141 if (count > size - off)
142 count = size - off;
143
144 if (count) {
145 /* Get a copy of the hvc and copy out the relevant portion. */
146 char *hvc;
147
148 size = off + count;
149 hvc = kmalloc(size, GFP_KERNEL);
150 if (hvc == NULL)
151 return -ENOMEM;
152 hv_confstr(HV_CONFSTR_HV_CONFIG, (unsigned long)hvc, size);
153 memcpy(buf, hvc + off, count);
154 kfree(hvc);
155 }
156
157 return count;
158}
159
160static int __init create_sysfs_entries(void)
161{
162 int err = 0;
163
164#define create_cpu_attr(name) \
165 if (!err) \
166 err = device_create_file(cpu_subsys.dev_root, &dev_attr_##name);
167 create_cpu_attr(chip_width);
168 create_cpu_attr(chip_height);
169 create_cpu_attr(chip_serial);
170 create_cpu_attr(chip_revision);
171
172#define create_hv_attr(name) \
173 if (!err) \
174 err = sysfs_create_file(hypervisor_kobj, &dev_attr_##name.attr);
175 create_hv_attr(type);
176 create_hv_attr(version);
177 create_hv_attr(config_version);
178
179 if (!err)
180 err = sysfs_create_group(hypervisor_kobj, &board_attr_group);
181
182 if (!err) {
183 sysfs_bin_attr_init(&hvconfig_bin);
184 hvconfig_bin.attr.name = "hvconfig";
185 hvconfig_bin.attr.mode = S_IRUGO;
186 hvconfig_bin.read = hvconfig_bin_read;
187 hvconfig_bin.size = PAGE_SIZE;
188 err = sysfs_create_bin_file(hypervisor_kobj, &hvconfig_bin);
189 }
190
191 return err;
192}
193subsys_initcall(create_sysfs_entries);