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6391a706 OBC |
1 | /* |
2 | * Remote Processor Framework | |
3 | * | |
4 | * Copyright (C) 2011 Texas Instruments, Inc. | |
5 | * Copyright (C) 2011 Google, Inc. | |
6 | * | |
7 | * Ohad Ben-Cohen <ohad@wizery.com> | |
8 | * Mark Grosen <mgrosen@ti.com> | |
9 | * Brian Swetland <swetland@google.com> | |
10 | * Fernando Guzman Lugo <fernando.lugo@ti.com> | |
11 | * Suman Anna <s-anna@ti.com> | |
12 | * Robert Tivy <rtivy@ti.com> | |
13 | * Armando Uribe De Leon <x0095078@ti.com> | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License | |
17 | * version 2 as published by the Free Software Foundation. | |
18 | * | |
19 | * This program is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU General Public License for more details. | |
23 | */ | |
24 | ||
25 | #define pr_fmt(fmt) "%s: " fmt, __func__ | |
26 | ||
27 | #include <linux/kernel.h> | |
28 | #include <linux/debugfs.h> | |
29 | #include <linux/remoteproc.h> | |
30 | #include <linux/device.h> | |
2e37abb8 FGL |
31 | #include <linux/uaccess.h> |
32 | ||
33 | #include "remoteproc_internal.h" | |
6391a706 OBC |
34 | |
35 | /* remoteproc debugfs parent dir */ | |
36 | static struct dentry *rproc_dbg; | |
37 | ||
38 | /* | |
39 | * Some remote processors may support dumping trace logs into a shared | |
40 | * memory buffer. We expose this trace buffer using debugfs, so users | |
41 | * can easily tell what's going on remotely. | |
42 | * | |
43 | * We will most probably improve the rproc tracing facilities later on, | |
44 | * but this kind of lightweight and simple mechanism is always good to have, | |
45 | * as it provides very early tracing with little to no dependencies at all. | |
46 | */ | |
47 | static ssize_t rproc_trace_read(struct file *filp, char __user *userbuf, | |
730f84ce | 48 | size_t count, loff_t *ppos) |
6391a706 OBC |
49 | { |
50 | struct rproc_mem_entry *trace = filp->private_data; | |
51 | int len = strnlen(trace->va, trace->len); | |
52 | ||
53 | return simple_read_from_buffer(userbuf, count, ppos, trace->va, len); | |
54 | } | |
55 | ||
6391a706 OBC |
56 | static const struct file_operations trace_rproc_ops = { |
57 | .read = rproc_trace_read, | |
234e3405 | 58 | .open = simple_open, |
6391a706 OBC |
59 | .llseek = generic_file_llseek, |
60 | }; | |
61 | ||
6391a706 OBC |
62 | /* expose the name of the remote processor via debugfs */ |
63 | static ssize_t rproc_name_read(struct file *filp, char __user *userbuf, | |
730f84ce | 64 | size_t count, loff_t *ppos) |
6391a706 OBC |
65 | { |
66 | struct rproc *rproc = filp->private_data; | |
67 | /* need room for the name, a newline and a terminating null */ | |
68 | char buf[100]; | |
69 | int i; | |
70 | ||
ae768d5f | 71 | i = scnprintf(buf, sizeof(buf), "%.98s\n", rproc->name); |
6391a706 OBC |
72 | |
73 | return simple_read_from_buffer(userbuf, count, ppos, buf, i); | |
74 | } | |
75 | ||
76 | static const struct file_operations rproc_name_ops = { | |
77 | .read = rproc_name_read, | |
234e3405 | 78 | .open = simple_open, |
6391a706 OBC |
79 | .llseek = generic_file_llseek, |
80 | }; | |
81 | ||
2e37abb8 FGL |
82 | /* expose recovery flag via debugfs */ |
83 | static ssize_t rproc_recovery_read(struct file *filp, char __user *userbuf, | |
84 | size_t count, loff_t *ppos) | |
85 | { | |
86 | struct rproc *rproc = filp->private_data; | |
87 | char *buf = rproc->recovery_disabled ? "disabled\n" : "enabled\n"; | |
88 | ||
89 | return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf)); | |
90 | } | |
91 | ||
92 | /* | |
93 | * By writing to the 'recovery' debugfs entry, we control the behavior of the | |
94 | * recovery mechanism dynamically. The default value of this entry is "enabled". | |
95 | * | |
96 | * The 'recovery' debugfs entry supports these commands: | |
97 | * | |
98 | * enabled: When enabled, the remote processor will be automatically | |
99 | * recovered whenever it crashes. Moreover, if the remote | |
100 | * processor crashes while recovery is disabled, it will | |
101 | * be automatically recovered too as soon as recovery is enabled. | |
102 | * | |
103 | * disabled: When disabled, a remote processor will remain in a crashed | |
104 | * state if it crashes. This is useful for debugging purposes; | |
105 | * without it, debugging a crash is substantially harder. | |
106 | * | |
107 | * recover: This function will trigger an immediate recovery if the | |
108 | * remote processor is in a crashed state, without changing | |
109 | * or checking the recovery state (enabled/disabled). | |
110 | * This is useful during debugging sessions, when one expects | |
111 | * additional crashes to happen after enabling recovery. In this | |
112 | * case, enabling recovery will make it hard to debug subsequent | |
113 | * crashes, so it's recommended to keep recovery disabled, and | |
114 | * instead use the "recover" command as needed. | |
115 | */ | |
116 | static ssize_t | |
117 | rproc_recovery_write(struct file *filp, const char __user *user_buf, | |
118 | size_t count, loff_t *ppos) | |
119 | { | |
120 | struct rproc *rproc = filp->private_data; | |
121 | char buf[10]; | |
122 | int ret; | |
123 | ||
92792e48 | 124 | if (count < 1 || count > sizeof(buf)) |
47fff9fd | 125 | return -EINVAL; |
2e37abb8 FGL |
126 | |
127 | ret = copy_from_user(buf, user_buf, count); | |
128 | if (ret) | |
bec109a4 | 129 | return -EFAULT; |
2e37abb8 FGL |
130 | |
131 | /* remove end of line */ | |
132 | if (buf[count - 1] == '\n') | |
133 | buf[count - 1] = '\0'; | |
134 | ||
135 | if (!strncmp(buf, "enabled", count)) { | |
136 | rproc->recovery_disabled = false; | |
137 | /* if rproc has crashed, trigger recovery */ | |
138 | if (rproc->state == RPROC_CRASHED) | |
139 | rproc_trigger_recovery(rproc); | |
140 | } else if (!strncmp(buf, "disabled", count)) { | |
141 | rproc->recovery_disabled = true; | |
142 | } else if (!strncmp(buf, "recover", count)) { | |
143 | /* if rproc has crashed, trigger recovery */ | |
144 | if (rproc->state == RPROC_CRASHED) | |
145 | rproc_trigger_recovery(rproc); | |
146 | } | |
147 | ||
148 | return count; | |
149 | } | |
150 | ||
151 | static const struct file_operations rproc_recovery_ops = { | |
152 | .read = rproc_recovery_read, | |
153 | .write = rproc_recovery_write, | |
154 | .open = simple_open, | |
155 | .llseek = generic_file_llseek, | |
156 | }; | |
157 | ||
bdd8edb9 LP |
158 | /* Expose resource table content via debugfs */ |
159 | static int rproc_rsc_table_show(struct seq_file *seq, void *p) | |
160 | { | |
161 | static const char * const types[] = {"carveout", "devmem", "trace", "vdev"}; | |
162 | struct rproc *rproc = seq->private; | |
163 | struct resource_table *table = rproc->table_ptr; | |
164 | struct fw_rsc_carveout *c; | |
165 | struct fw_rsc_devmem *d; | |
166 | struct fw_rsc_trace *t; | |
167 | struct fw_rsc_vdev *v; | |
168 | int i, j; | |
169 | ||
170 | if (!table) { | |
171 | seq_puts(seq, "No resource table found\n"); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | for (i = 0; i < table->num; i++) { | |
176 | int offset = table->offset[i]; | |
177 | struct fw_rsc_hdr *hdr = (void *)table + offset; | |
178 | void *rsc = (void *)hdr + sizeof(*hdr); | |
179 | ||
180 | switch (hdr->type) { | |
181 | case RSC_CARVEOUT: | |
182 | c = rsc; | |
183 | seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]); | |
184 | seq_printf(seq, " Device Address 0x%x\n", c->da); | |
185 | seq_printf(seq, " Physical Address 0x%x\n", c->pa); | |
186 | seq_printf(seq, " Length 0x%x Bytes\n", c->len); | |
187 | seq_printf(seq, " Flags 0x%x\n", c->flags); | |
188 | seq_printf(seq, " Reserved (should be zero) [%d]\n", c->reserved); | |
189 | seq_printf(seq, " Name %s\n\n", c->name); | |
190 | break; | |
191 | case RSC_DEVMEM: | |
192 | d = rsc; | |
193 | seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]); | |
194 | seq_printf(seq, " Device Address 0x%x\n", d->da); | |
195 | seq_printf(seq, " Physical Address 0x%x\n", d->pa); | |
196 | seq_printf(seq, " Length 0x%x Bytes\n", d->len); | |
197 | seq_printf(seq, " Flags 0x%x\n", d->flags); | |
198 | seq_printf(seq, " Reserved (should be zero) [%d]\n", d->reserved); | |
199 | seq_printf(seq, " Name %s\n\n", d->name); | |
200 | break; | |
201 | case RSC_TRACE: | |
202 | t = rsc; | |
203 | seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]); | |
204 | seq_printf(seq, " Device Address 0x%x\n", t->da); | |
205 | seq_printf(seq, " Length 0x%x Bytes\n", t->len); | |
206 | seq_printf(seq, " Reserved (should be zero) [%d]\n", t->reserved); | |
207 | seq_printf(seq, " Name %s\n\n", t->name); | |
208 | break; | |
209 | case RSC_VDEV: | |
210 | v = rsc; | |
211 | seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]); | |
212 | ||
213 | seq_printf(seq, " ID %d\n", v->id); | |
214 | seq_printf(seq, " Notify ID %d\n", v->notifyid); | |
215 | seq_printf(seq, " Device features 0x%x\n", v->dfeatures); | |
216 | seq_printf(seq, " Guest features 0x%x\n", v->gfeatures); | |
217 | seq_printf(seq, " Config length 0x%x\n", v->config_len); | |
218 | seq_printf(seq, " Status 0x%x\n", v->status); | |
219 | seq_printf(seq, " Number of vrings %d\n", v->num_of_vrings); | |
220 | seq_printf(seq, " Reserved (should be zero) [%d][%d]\n\n", | |
221 | v->reserved[0], v->reserved[1]); | |
222 | ||
223 | for (j = 0; j < v->num_of_vrings; j++) { | |
224 | seq_printf(seq, " Vring %d\n", j); | |
225 | seq_printf(seq, " Device Address 0x%x\n", v->vring[j].da); | |
226 | seq_printf(seq, " Alignment %d\n", v->vring[j].align); | |
227 | seq_printf(seq, " Number of buffers %d\n", v->vring[j].num); | |
228 | seq_printf(seq, " Notify ID %d\n", v->vring[j].notifyid); | |
229 | seq_printf(seq, " Physical Address 0x%x\n\n", | |
230 | v->vring[j].pa); | |
231 | } | |
232 | break; | |
233 | default: | |
234 | seq_printf(seq, "Unknown resource type found: %d [hdr: %p]\n", | |
235 | hdr->type, hdr); | |
236 | break; | |
237 | } | |
238 | } | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static int rproc_rsc_table_open(struct inode *inode, struct file *file) | |
244 | { | |
245 | return single_open(file, rproc_rsc_table_show, inode->i_private); | |
246 | } | |
247 | ||
248 | static const struct file_operations rproc_rsc_table_ops = { | |
249 | .open = rproc_rsc_table_open, | |
250 | .read = seq_read, | |
251 | .llseek = seq_lseek, | |
252 | .release = single_release, | |
253 | }; | |
254 | ||
b8918839 LP |
255 | /* Expose carveout content via debugfs */ |
256 | static int rproc_carveouts_show(struct seq_file *seq, void *p) | |
257 | { | |
258 | struct rproc *rproc = seq->private; | |
259 | struct rproc_mem_entry *carveout; | |
260 | ||
261 | list_for_each_entry(carveout, &rproc->carveouts, node) { | |
262 | seq_puts(seq, "Carveout memory entry:\n"); | |
263 | seq_printf(seq, "\tVirtual address: %p\n", carveout->va); | |
264 | seq_printf(seq, "\tDMA address: %pad\n", &carveout->dma); | |
265 | seq_printf(seq, "\tDevice address: 0x%x\n", carveout->da); | |
266 | seq_printf(seq, "\tLength: 0x%x Bytes\n\n", carveout->len); | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static int rproc_carveouts_open(struct inode *inode, struct file *file) | |
273 | { | |
274 | return single_open(file, rproc_carveouts_show, inode->i_private); | |
275 | } | |
276 | ||
277 | static const struct file_operations rproc_carveouts_ops = { | |
278 | .open = rproc_carveouts_open, | |
279 | .read = seq_read, | |
280 | .llseek = seq_lseek, | |
281 | .release = single_release, | |
282 | }; | |
283 | ||
6391a706 OBC |
284 | void rproc_remove_trace_file(struct dentry *tfile) |
285 | { | |
286 | debugfs_remove(tfile); | |
287 | } | |
288 | ||
289 | struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc, | |
730f84ce | 290 | struct rproc_mem_entry *trace) |
6391a706 OBC |
291 | { |
292 | struct dentry *tfile; | |
293 | ||
730f84ce AS |
294 | tfile = debugfs_create_file(name, 0400, rproc->dbg_dir, trace, |
295 | &trace_rproc_ops); | |
6391a706 | 296 | if (!tfile) { |
b5ab5e24 | 297 | dev_err(&rproc->dev, "failed to create debugfs trace entry\n"); |
6391a706 OBC |
298 | return NULL; |
299 | } | |
300 | ||
301 | return tfile; | |
302 | } | |
303 | ||
304 | void rproc_delete_debug_dir(struct rproc *rproc) | |
305 | { | |
306 | if (!rproc->dbg_dir) | |
307 | return; | |
308 | ||
309 | debugfs_remove_recursive(rproc->dbg_dir); | |
310 | } | |
311 | ||
312 | void rproc_create_debug_dir(struct rproc *rproc) | |
313 | { | |
b5ab5e24 | 314 | struct device *dev = &rproc->dev; |
6391a706 OBC |
315 | |
316 | if (!rproc_dbg) | |
317 | return; | |
318 | ||
319 | rproc->dbg_dir = debugfs_create_dir(dev_name(dev), rproc_dbg); | |
320 | if (!rproc->dbg_dir) | |
321 | return; | |
322 | ||
323 | debugfs_create_file("name", 0400, rproc->dbg_dir, | |
730f84ce | 324 | rproc, &rproc_name_ops); |
2e37abb8 | 325 | debugfs_create_file("recovery", 0400, rproc->dbg_dir, |
730f84ce | 326 | rproc, &rproc_recovery_ops); |
bdd8edb9 LP |
327 | debugfs_create_file("resource_table", 0400, rproc->dbg_dir, |
328 | rproc, &rproc_rsc_table_ops); | |
b8918839 LP |
329 | debugfs_create_file("carveout_memories", 0400, rproc->dbg_dir, |
330 | rproc, &rproc_carveouts_ops); | |
6391a706 OBC |
331 | } |
332 | ||
333 | void __init rproc_init_debugfs(void) | |
334 | { | |
335 | if (debugfs_initialized()) { | |
336 | rproc_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL); | |
337 | if (!rproc_dbg) | |
338 | pr_err("can't create debugfs dir\n"); | |
339 | } | |
340 | } | |
341 | ||
342 | void __exit rproc_exit_debugfs(void) | |
343 | { | |
57971159 | 344 | debugfs_remove(rproc_dbg); |
6391a706 | 345 | } |