mirror of https://gitee.com/openkylin/linux.git
375 lines
11 KiB
C
375 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Remote Processor Framework
|
|
*
|
|
* Copyright (C) 2011 Texas Instruments, Inc.
|
|
* Copyright (C) 2011 Google, Inc.
|
|
*
|
|
* Ohad Ben-Cohen <ohad@wizery.com>
|
|
* Mark Grosen <mgrosen@ti.com>
|
|
* Brian Swetland <swetland@google.com>
|
|
* Fernando Guzman Lugo <fernando.lugo@ti.com>
|
|
* Suman Anna <s-anna@ti.com>
|
|
* Robert Tivy <rtivy@ti.com>
|
|
* Armando Uribe De Leon <x0095078@ti.com>
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "%s: " fmt, __func__
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/debugfs.h>
|
|
#include <linux/remoteproc.h>
|
|
#include <linux/device.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include "remoteproc_internal.h"
|
|
|
|
/* remoteproc debugfs parent dir */
|
|
static struct dentry *rproc_dbg;
|
|
|
|
/*
|
|
* Some remote processors may support dumping trace logs into a shared
|
|
* memory buffer. We expose this trace buffer using debugfs, so users
|
|
* can easily tell what's going on remotely.
|
|
*
|
|
* We will most probably improve the rproc tracing facilities later on,
|
|
* but this kind of lightweight and simple mechanism is always good to have,
|
|
* as it provides very early tracing with little to no dependencies at all.
|
|
*/
|
|
static ssize_t rproc_trace_read(struct file *filp, char __user *userbuf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct rproc_debug_trace *data = filp->private_data;
|
|
struct rproc_mem_entry *trace = &data->trace_mem;
|
|
void *va;
|
|
char buf[100];
|
|
int len;
|
|
|
|
va = rproc_da_to_va(data->rproc, trace->da, trace->len);
|
|
|
|
if (!va) {
|
|
len = scnprintf(buf, sizeof(buf), "Trace %s not available\n",
|
|
trace->name);
|
|
va = buf;
|
|
} else {
|
|
len = strnlen(va, trace->len);
|
|
}
|
|
|
|
return simple_read_from_buffer(userbuf, count, ppos, va, len);
|
|
}
|
|
|
|
static const struct file_operations trace_rproc_ops = {
|
|
.read = rproc_trace_read,
|
|
.open = simple_open,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/* expose the name of the remote processor via debugfs */
|
|
static ssize_t rproc_name_read(struct file *filp, char __user *userbuf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct rproc *rproc = filp->private_data;
|
|
/* need room for the name, a newline and a terminating null */
|
|
char buf[100];
|
|
int i;
|
|
|
|
i = scnprintf(buf, sizeof(buf), "%.98s\n", rproc->name);
|
|
|
|
return simple_read_from_buffer(userbuf, count, ppos, buf, i);
|
|
}
|
|
|
|
static const struct file_operations rproc_name_ops = {
|
|
.read = rproc_name_read,
|
|
.open = simple_open,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/* expose recovery flag via debugfs */
|
|
static ssize_t rproc_recovery_read(struct file *filp, char __user *userbuf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct rproc *rproc = filp->private_data;
|
|
char *buf = rproc->recovery_disabled ? "disabled\n" : "enabled\n";
|
|
|
|
return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
|
|
}
|
|
|
|
/*
|
|
* By writing to the 'recovery' debugfs entry, we control the behavior of the
|
|
* recovery mechanism dynamically. The default value of this entry is "enabled".
|
|
*
|
|
* The 'recovery' debugfs entry supports these commands:
|
|
*
|
|
* enabled: When enabled, the remote processor will be automatically
|
|
* recovered whenever it crashes. Moreover, if the remote
|
|
* processor crashes while recovery is disabled, it will
|
|
* be automatically recovered too as soon as recovery is enabled.
|
|
*
|
|
* disabled: When disabled, a remote processor will remain in a crashed
|
|
* state if it crashes. This is useful for debugging purposes;
|
|
* without it, debugging a crash is substantially harder.
|
|
*
|
|
* recover: This function will trigger an immediate recovery if the
|
|
* remote processor is in a crashed state, without changing
|
|
* or checking the recovery state (enabled/disabled).
|
|
* This is useful during debugging sessions, when one expects
|
|
* additional crashes to happen after enabling recovery. In this
|
|
* case, enabling recovery will make it hard to debug subsequent
|
|
* crashes, so it's recommended to keep recovery disabled, and
|
|
* instead use the "recover" command as needed.
|
|
*/
|
|
static ssize_t
|
|
rproc_recovery_write(struct file *filp, const char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct rproc *rproc = filp->private_data;
|
|
char buf[10];
|
|
int ret;
|
|
|
|
if (count < 1 || count > sizeof(buf))
|
|
return -EINVAL;
|
|
|
|
ret = copy_from_user(buf, user_buf, count);
|
|
if (ret)
|
|
return -EFAULT;
|
|
|
|
/* remove end of line */
|
|
if (buf[count - 1] == '\n')
|
|
buf[count - 1] = '\0';
|
|
|
|
if (!strncmp(buf, "enabled", count)) {
|
|
/* change the flag and begin the recovery process if needed */
|
|
rproc->recovery_disabled = false;
|
|
rproc_trigger_recovery(rproc);
|
|
} else if (!strncmp(buf, "disabled", count)) {
|
|
rproc->recovery_disabled = true;
|
|
} else if (!strncmp(buf, "recover", count)) {
|
|
/* begin the recovery process without changing the flag */
|
|
rproc_trigger_recovery(rproc);
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations rproc_recovery_ops = {
|
|
.read = rproc_recovery_read,
|
|
.write = rproc_recovery_write,
|
|
.open = simple_open,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/* expose the crash trigger via debugfs */
|
|
static ssize_t
|
|
rproc_crash_write(struct file *filp, const char __user *user_buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct rproc *rproc = filp->private_data;
|
|
unsigned int type;
|
|
int ret;
|
|
|
|
ret = kstrtouint_from_user(user_buf, count, 0, &type);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
rproc_report_crash(rproc, type);
|
|
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations rproc_crash_ops = {
|
|
.write = rproc_crash_write,
|
|
.open = simple_open,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
/* Expose resource table content via debugfs */
|
|
static int rproc_rsc_table_show(struct seq_file *seq, void *p)
|
|
{
|
|
static const char * const types[] = {"carveout", "devmem", "trace", "vdev"};
|
|
struct rproc *rproc = seq->private;
|
|
struct resource_table *table = rproc->table_ptr;
|
|
struct fw_rsc_carveout *c;
|
|
struct fw_rsc_devmem *d;
|
|
struct fw_rsc_trace *t;
|
|
struct fw_rsc_vdev *v;
|
|
int i, j;
|
|
|
|
if (!table) {
|
|
seq_puts(seq, "No resource table found\n");
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < table->num; i++) {
|
|
int offset = table->offset[i];
|
|
struct fw_rsc_hdr *hdr = (void *)table + offset;
|
|
void *rsc = (void *)hdr + sizeof(*hdr);
|
|
|
|
switch (hdr->type) {
|
|
case RSC_CARVEOUT:
|
|
c = rsc;
|
|
seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]);
|
|
seq_printf(seq, " Device Address 0x%x\n", c->da);
|
|
seq_printf(seq, " Physical Address 0x%x\n", c->pa);
|
|
seq_printf(seq, " Length 0x%x Bytes\n", c->len);
|
|
seq_printf(seq, " Flags 0x%x\n", c->flags);
|
|
seq_printf(seq, " Reserved (should be zero) [%d]\n", c->reserved);
|
|
seq_printf(seq, " Name %s\n\n", c->name);
|
|
break;
|
|
case RSC_DEVMEM:
|
|
d = rsc;
|
|
seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]);
|
|
seq_printf(seq, " Device Address 0x%x\n", d->da);
|
|
seq_printf(seq, " Physical Address 0x%x\n", d->pa);
|
|
seq_printf(seq, " Length 0x%x Bytes\n", d->len);
|
|
seq_printf(seq, " Flags 0x%x\n", d->flags);
|
|
seq_printf(seq, " Reserved (should be zero) [%d]\n", d->reserved);
|
|
seq_printf(seq, " Name %s\n\n", d->name);
|
|
break;
|
|
case RSC_TRACE:
|
|
t = rsc;
|
|
seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]);
|
|
seq_printf(seq, " Device Address 0x%x\n", t->da);
|
|
seq_printf(seq, " Length 0x%x Bytes\n", t->len);
|
|
seq_printf(seq, " Reserved (should be zero) [%d]\n", t->reserved);
|
|
seq_printf(seq, " Name %s\n\n", t->name);
|
|
break;
|
|
case RSC_VDEV:
|
|
v = rsc;
|
|
seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]);
|
|
|
|
seq_printf(seq, " ID %d\n", v->id);
|
|
seq_printf(seq, " Notify ID %d\n", v->notifyid);
|
|
seq_printf(seq, " Device features 0x%x\n", v->dfeatures);
|
|
seq_printf(seq, " Guest features 0x%x\n", v->gfeatures);
|
|
seq_printf(seq, " Config length 0x%x\n", v->config_len);
|
|
seq_printf(seq, " Status 0x%x\n", v->status);
|
|
seq_printf(seq, " Number of vrings %d\n", v->num_of_vrings);
|
|
seq_printf(seq, " Reserved (should be zero) [%d][%d]\n\n",
|
|
v->reserved[0], v->reserved[1]);
|
|
|
|
for (j = 0; j < v->num_of_vrings; j++) {
|
|
seq_printf(seq, " Vring %d\n", j);
|
|
seq_printf(seq, " Device Address 0x%x\n", v->vring[j].da);
|
|
seq_printf(seq, " Alignment %d\n", v->vring[j].align);
|
|
seq_printf(seq, " Number of buffers %d\n", v->vring[j].num);
|
|
seq_printf(seq, " Notify ID %d\n", v->vring[j].notifyid);
|
|
seq_printf(seq, " Physical Address 0x%x\n\n",
|
|
v->vring[j].pa);
|
|
}
|
|
break;
|
|
default:
|
|
seq_printf(seq, "Unknown resource type found: %d [hdr: %pK]\n",
|
|
hdr->type, hdr);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rproc_rsc_table_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, rproc_rsc_table_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations rproc_rsc_table_ops = {
|
|
.open = rproc_rsc_table_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
/* Expose carveout content via debugfs */
|
|
static int rproc_carveouts_show(struct seq_file *seq, void *p)
|
|
{
|
|
struct rproc *rproc = seq->private;
|
|
struct rproc_mem_entry *carveout;
|
|
|
|
list_for_each_entry(carveout, &rproc->carveouts, node) {
|
|
seq_puts(seq, "Carveout memory entry:\n");
|
|
seq_printf(seq, "\tName: %s\n", carveout->name);
|
|
seq_printf(seq, "\tVirtual address: %pK\n", carveout->va);
|
|
seq_printf(seq, "\tDMA address: %pad\n", &carveout->dma);
|
|
seq_printf(seq, "\tDevice address: 0x%x\n", carveout->da);
|
|
seq_printf(seq, "\tLength: 0x%zx Bytes\n\n", carveout->len);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rproc_carveouts_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, rproc_carveouts_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations rproc_carveouts_ops = {
|
|
.open = rproc_carveouts_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
void rproc_remove_trace_file(struct dentry *tfile)
|
|
{
|
|
debugfs_remove(tfile);
|
|
}
|
|
|
|
struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
|
|
struct rproc_debug_trace *trace)
|
|
{
|
|
struct dentry *tfile;
|
|
|
|
tfile = debugfs_create_file(name, 0400, rproc->dbg_dir, trace,
|
|
&trace_rproc_ops);
|
|
if (!tfile) {
|
|
dev_err(&rproc->dev, "failed to create debugfs trace entry\n");
|
|
return NULL;
|
|
}
|
|
|
|
return tfile;
|
|
}
|
|
|
|
void rproc_delete_debug_dir(struct rproc *rproc)
|
|
{
|
|
debugfs_remove_recursive(rproc->dbg_dir);
|
|
}
|
|
|
|
void rproc_create_debug_dir(struct rproc *rproc)
|
|
{
|
|
struct device *dev = &rproc->dev;
|
|
|
|
if (!rproc_dbg)
|
|
return;
|
|
|
|
rproc->dbg_dir = debugfs_create_dir(dev_name(dev), rproc_dbg);
|
|
if (!rproc->dbg_dir)
|
|
return;
|
|
|
|
debugfs_create_file("name", 0400, rproc->dbg_dir,
|
|
rproc, &rproc_name_ops);
|
|
debugfs_create_file("recovery", 0600, rproc->dbg_dir,
|
|
rproc, &rproc_recovery_ops);
|
|
debugfs_create_file("crash", 0200, rproc->dbg_dir,
|
|
rproc, &rproc_crash_ops);
|
|
debugfs_create_file("resource_table", 0400, rproc->dbg_dir,
|
|
rproc, &rproc_rsc_table_ops);
|
|
debugfs_create_file("carveout_memories", 0400, rproc->dbg_dir,
|
|
rproc, &rproc_carveouts_ops);
|
|
}
|
|
|
|
void __init rproc_init_debugfs(void)
|
|
{
|
|
if (debugfs_initialized()) {
|
|
rproc_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
|
|
if (!rproc_dbg)
|
|
pr_err("can't create debugfs dir\n");
|
|
}
|
|
}
|
|
|
|
void __exit rproc_exit_debugfs(void)
|
|
{
|
|
debugfs_remove(rproc_dbg);
|
|
}
|