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authorDavid Gibson <david@gibson.dropbear.id.au>2005-11-09 20:42:17 -0500
committerPaul Mackerras <paulus@samba.org>2005-11-09 21:09:27 -0500
commitf6d3577da14e877b79517c883d1139ee6ad7da45 (patch)
treed1ac8bc6dc184ec44683fca01826f5794d5d92b1 /arch/ppc64/kernel/scanlog.c
parent26ef5c09576496dfd08d2b36ec1d08a6f917a0eb (diff)
[PATCH] powerpc: Move scanlog.c to platforms/pseries
scanlog.c is only compiled on pSeries. Thus, this patch moves it to platforms/pseries. Built and booted on pSeries LPAR (ARCH=powerpc and ARCH=ppc64). Built for iSeries (ARCH=powerpc). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc64/kernel/scanlog.c')
-rw-r--r--arch/ppc64/kernel/scanlog.c235
1 files changed, 0 insertions, 235 deletions
diff --git a/arch/ppc64/kernel/scanlog.c b/arch/ppc64/kernel/scanlog.c
deleted file mode 100644
index 2edc947f7c44..000000000000
--- a/arch/ppc64/kernel/scanlog.c
+++ /dev/null
@@ -1,235 +0,0 @@
1/*
2 * c 2001 PPC 64 Team, IBM Corp
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; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * scan-log-data driver for PPC64 Todd Inglett <tinglett@vnet.ibm.com>
10 *
11 * When ppc64 hardware fails the service processor dumps internal state
12 * of the system. After a reboot the operating system can access a dump
13 * of this data using this driver. A dump exists if the device-tree
14 * /chosen/ibm,scan-log-data property exists.
15 *
16 * This driver exports /proc/ppc64/scan-log-dump which can be read.
17 * The driver supports only sequential reads.
18 *
19 * The driver looks at a write to the driver for the single word "reset".
20 * If given, the driver will reset the scanlog so the platform can free it.
21 */
22
23#include <linux/module.h>
24#include <linux/types.h>
25#include <linux/errno.h>
26#include <linux/proc_fs.h>
27#include <linux/init.h>
28#include <linux/delay.h>
29#include <asm/uaccess.h>
30#include <asm/rtas.h>
31#include <asm/prom.h>
32
33#define MODULE_VERS "1.0"
34#define MODULE_NAME "scanlog"
35
36/* Status returns from ibm,scan-log-dump */
37#define SCANLOG_COMPLETE 0
38#define SCANLOG_HWERROR -1
39#define SCANLOG_CONTINUE 1
40
41#define DEBUG(A...) do { if (scanlog_debug) printk(KERN_ERR "scanlog: " A); } while (0)
42
43static int scanlog_debug;
44static unsigned int ibm_scan_log_dump; /* RTAS token */
45static struct proc_dir_entry *proc_ppc64_scan_log_dump; /* The proc file */
46
47static ssize_t scanlog_read(struct file *file, char __user *buf,
48 size_t count, loff_t *ppos)
49{
50 struct inode * inode = file->f_dentry->d_inode;
51 struct proc_dir_entry *dp;
52 unsigned int *data;
53 int status;
54 unsigned long len, off;
55 unsigned int wait_time;
56
57 dp = PDE(inode);
58 data = (unsigned int *)dp->data;
59
60 if (!data) {
61 printk(KERN_ERR "scanlog: read failed no data\n");
62 return -EIO;
63 }
64
65 if (count > RTAS_DATA_BUF_SIZE)
66 count = RTAS_DATA_BUF_SIZE;
67
68 if (count < 1024) {
69 /* This is the min supported by this RTAS call. Rather
70 * than do all the buffering we insist the user code handle
71 * larger reads. As long as cp works... :)
72 */
73 printk(KERN_ERR "scanlog: cannot perform a small read (%ld)\n", count);
74 return -EINVAL;
75 }
76
77 if (!access_ok(VERIFY_WRITE, buf, count))
78 return -EFAULT;
79
80 for (;;) {
81 wait_time = 500; /* default wait if no data */
82 spin_lock(&rtas_data_buf_lock);
83 memcpy(rtas_data_buf, data, RTAS_DATA_BUF_SIZE);
84 status = rtas_call(ibm_scan_log_dump, 2, 1, NULL,
85 (u32) __pa(rtas_data_buf), (u32) count);
86 memcpy(data, rtas_data_buf, RTAS_DATA_BUF_SIZE);
87 spin_unlock(&rtas_data_buf_lock);
88
89 DEBUG("status=%d, data[0]=%x, data[1]=%x, data[2]=%x\n",
90 status, data[0], data[1], data[2]);
91 switch (status) {
92 case SCANLOG_COMPLETE:
93 DEBUG("hit eof\n");
94 return 0;
95 case SCANLOG_HWERROR:
96 DEBUG("hardware error reading scan log data\n");
97 return -EIO;
98 case SCANLOG_CONTINUE:
99 /* We may or may not have data yet */
100 len = data[1];
101 off = data[2];
102 if (len > 0) {
103 if (copy_to_user(buf, ((char *)data)+off, len))
104 return -EFAULT;
105 return len;
106 }
107 /* Break to sleep default time */
108 break;
109 default:
110 if (status > 9900 && status <= 9905) {
111 wait_time = rtas_extended_busy_delay_time(status);
112 } else {
113 printk(KERN_ERR "scanlog: unknown error from rtas: %d\n", status);
114 return -EIO;
115 }
116 }
117 /* Apparently no data yet. Wait and try again. */
118 msleep_interruptible(wait_time);
119 }
120 /*NOTREACHED*/
121}
122
123static ssize_t scanlog_write(struct file * file, const char __user * buf,
124 size_t count, loff_t *ppos)
125{
126 char stkbuf[20];
127 int status;
128
129 if (count > 19) count = 19;
130 if (copy_from_user (stkbuf, buf, count)) {
131 return -EFAULT;
132 }
133 stkbuf[count] = 0;
134
135 if (buf) {
136 if (strncmp(stkbuf, "reset", 5) == 0) {
137 DEBUG("reset scanlog\n");
138 status = rtas_call(ibm_scan_log_dump, 2, 1, NULL, 0, 0);
139 DEBUG("rtas returns %d\n", status);
140 } else if (strncmp(stkbuf, "debugon", 7) == 0) {
141 printk(KERN_ERR "scanlog: debug on\n");
142 scanlog_debug = 1;
143 } else if (strncmp(stkbuf, "debugoff", 8) == 0) {
144 printk(KERN_ERR "scanlog: debug off\n");
145 scanlog_debug = 0;
146 }
147 }
148 return count;
149}
150
151static int scanlog_open(struct inode * inode, struct file * file)
152{
153 struct proc_dir_entry *dp = PDE(inode);
154 unsigned int *data = (unsigned int *)dp->data;
155
156 if (!data) {
157 printk(KERN_ERR "scanlog: open failed no data\n");
158 return -EIO;
159 }
160
161 if (data[0] != 0) {
162 /* This imperfect test stops a second copy of the
163 * data (or a reset while data is being copied)
164 */
165 return -EBUSY;
166 }
167
168 data[0] = 0; /* re-init so we restart the scan */
169
170 return 0;
171}
172
173static int scanlog_release(struct inode * inode, struct file * file)
174{
175 struct proc_dir_entry *dp = PDE(inode);
176 unsigned int *data = (unsigned int *)dp->data;
177
178 if (!data) {
179 printk(KERN_ERR "scanlog: release failed no data\n");
180 return -EIO;
181 }
182 data[0] = 0;
183
184 return 0;
185}
186
187struct file_operations scanlog_fops = {
188 .owner = THIS_MODULE,
189 .read = scanlog_read,
190 .write = scanlog_write,
191 .open = scanlog_open,
192 .release = scanlog_release,
193};
194
195int __init scanlog_init(void)
196{
197 struct proc_dir_entry *ent;
198
199 ibm_scan_log_dump = rtas_token("ibm,scan-log-dump");
200 if (ibm_scan_log_dump == RTAS_UNKNOWN_SERVICE) {
201 printk(KERN_ERR "scan-log-dump not implemented on this system\n");
202 return -EIO;
203 }
204
205 ent = create_proc_entry("ppc64/rtas/scan-log-dump", S_IRUSR, NULL);
206 if (ent) {
207 ent->proc_fops = &scanlog_fops;
208 /* Ideally we could allocate a buffer < 4G */
209 ent->data = kmalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
210 if (!ent->data) {
211 printk(KERN_ERR "Failed to allocate a buffer\n");
212 remove_proc_entry("scan-log-dump", ent->parent);
213 return -ENOMEM;
214 }
215 ((unsigned int *)ent->data)[0] = 0;
216 } else {
217 printk(KERN_ERR "Failed to create ppc64/scan-log-dump proc entry\n");
218 return -EIO;
219 }
220 proc_ppc64_scan_log_dump = ent;
221
222 return 0;
223}
224
225void __exit scanlog_cleanup(void)
226{
227 if (proc_ppc64_scan_log_dump) {
228 kfree(proc_ppc64_scan_log_dump->data);
229 remove_proc_entry("scan-log-dump", proc_ppc64_scan_log_dump->parent);
230 }
231}
232
233module_init(scanlog_init);
234module_exit(scanlog_cleanup);
235MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-28 09:26:26 -0500