2019-05-27 14:55:21 +08:00
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// SPDX-License-Identifier: GPL-2.0-only
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2011-10-20 23:24:15 +08:00
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/*
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* Remote Processor Framework
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Mark Grosen <mgrosen@ti.com>
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* Brian Swetland <swetland@google.com>
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* Fernando Guzman Lugo <fernando.lugo@ti.com>
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* Suman Anna <s-anna@ti.com>
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* Robert Tivy <rtivy@ti.com>
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* Armando Uribe De Leon <x0095078@ti.com>
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/kernel.h>
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#include <linux/debugfs.h>
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#include <linux/remoteproc.h>
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#include <linux/device.h>
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2012-09-18 17:26:35 +08:00
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#include <linux/uaccess.h>
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#include "remoteproc_internal.h"
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2011-10-20 23:24:15 +08:00
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/* remoteproc debugfs parent dir */
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static struct dentry *rproc_dbg;
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/*
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* Some remote processors may support dumping trace logs into a shared
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* memory buffer. We expose this trace buffer using debugfs, so users
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* can easily tell what's going on remotely.
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*
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* We will most probably improve the rproc tracing facilities later on,
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* but this kind of lightweight and simple mechanism is always good to have,
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* as it provides very early tracing with little to no dependencies at all.
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*/
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static ssize_t rproc_trace_read(struct file *filp, char __user *userbuf,
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2016-08-13 07:42:20 +08:00
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size_t count, loff_t *ppos)
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2011-10-20 23:24:15 +08:00
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{
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2019-01-10 21:49:10 +08:00
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struct rproc_debug_trace *data = filp->private_data;
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struct rproc_mem_entry *trace = &data->trace_mem;
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void *va;
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char buf[100];
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int len;
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va = rproc_da_to_va(data->rproc, trace->da, trace->len);
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if (!va) {
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len = scnprintf(buf, sizeof(buf), "Trace %s not available\n",
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trace->name);
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va = buf;
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} else {
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len = strnlen(va, trace->len);
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}
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2011-10-20 23:24:15 +08:00
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2019-01-10 21:49:10 +08:00
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return simple_read_from_buffer(userbuf, count, ppos, va, len);
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2011-10-20 23:24:15 +08:00
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}
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static const struct file_operations trace_rproc_ops = {
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.read = rproc_trace_read,
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2012-04-06 05:25:11 +08:00
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.open = simple_open,
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2011-10-20 23:24:15 +08:00
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.llseek = generic_file_llseek,
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};
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/* expose the name of the remote processor via debugfs */
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static ssize_t rproc_name_read(struct file *filp, char __user *userbuf,
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2016-08-13 07:42:20 +08:00
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size_t count, loff_t *ppos)
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2011-10-20 23:24:15 +08:00
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{
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struct rproc *rproc = filp->private_data;
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/* need room for the name, a newline and a terminating null */
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char buf[100];
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int i;
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2012-09-25 15:02:51 +08:00
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i = scnprintf(buf, sizeof(buf), "%.98s\n", rproc->name);
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2011-10-20 23:24:15 +08:00
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return simple_read_from_buffer(userbuf, count, ppos, buf, i);
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}
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static const struct file_operations rproc_name_ops = {
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.read = rproc_name_read,
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2012-04-06 05:25:11 +08:00
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.open = simple_open,
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2011-10-20 23:24:15 +08:00
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.llseek = generic_file_llseek,
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};
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2012-09-18 17:26:35 +08:00
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/* expose recovery flag via debugfs */
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static ssize_t rproc_recovery_read(struct file *filp, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct rproc *rproc = filp->private_data;
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char *buf = rproc->recovery_disabled ? "disabled\n" : "enabled\n";
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return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
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}
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/*
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* By writing to the 'recovery' debugfs entry, we control the behavior of the
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* recovery mechanism dynamically. The default value of this entry is "enabled".
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*
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* The 'recovery' debugfs entry supports these commands:
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*
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* enabled: When enabled, the remote processor will be automatically
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* recovered whenever it crashes. Moreover, if the remote
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* processor crashes while recovery is disabled, it will
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* be automatically recovered too as soon as recovery is enabled.
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*
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* disabled: When disabled, a remote processor will remain in a crashed
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* state if it crashes. This is useful for debugging purposes;
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* without it, debugging a crash is substantially harder.
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*
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* recover: This function will trigger an immediate recovery if the
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* remote processor is in a crashed state, without changing
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* or checking the recovery state (enabled/disabled).
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* This is useful during debugging sessions, when one expects
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* additional crashes to happen after enabling recovery. In this
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* case, enabling recovery will make it hard to debug subsequent
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* crashes, so it's recommended to keep recovery disabled, and
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* instead use the "recover" command as needed.
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*/
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static ssize_t
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rproc_recovery_write(struct file *filp, const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct rproc *rproc = filp->private_data;
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char buf[10];
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int ret;
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2015-11-21 01:26:07 +08:00
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if (count < 1 || count > sizeof(buf))
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2016-01-12 20:46:15 +08:00
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return -EINVAL;
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2012-09-18 17:26:35 +08:00
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ret = copy_from_user(buf, user_buf, count);
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if (ret)
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2012-09-25 15:05:33 +08:00
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return -EFAULT;
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2012-09-18 17:26:35 +08:00
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/* remove end of line */
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if (buf[count - 1] == '\n')
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buf[count - 1] = '\0';
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if (!strncmp(buf, "enabled", count)) {
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rproc->recovery_disabled = false;
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/* if rproc has crashed, trigger recovery */
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if (rproc->state == RPROC_CRASHED)
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rproc_trigger_recovery(rproc);
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} else if (!strncmp(buf, "disabled", count)) {
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rproc->recovery_disabled = true;
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} else if (!strncmp(buf, "recover", count)) {
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/* if rproc has crashed, trigger recovery */
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if (rproc->state == RPROC_CRASHED)
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rproc_trigger_recovery(rproc);
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}
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return count;
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}
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static const struct file_operations rproc_recovery_ops = {
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.read = rproc_recovery_read,
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.write = rproc_recovery_write,
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.open = simple_open,
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.llseek = generic_file_llseek,
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};
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2018-11-07 23:26:01 +08:00
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/* expose the crash trigger via debugfs */
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static ssize_t
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rproc_crash_write(struct file *filp, const char __user *user_buf,
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size_t count, loff_t *ppos)
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{
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struct rproc *rproc = filp->private_data;
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unsigned int type;
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int ret;
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ret = kstrtouint_from_user(user_buf, count, 0, &type);
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if (ret < 0)
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return ret;
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rproc_report_crash(rproc, type);
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return count;
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}
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static const struct file_operations rproc_crash_ops = {
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.write = rproc_crash_write,
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.open = simple_open,
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.llseek = generic_file_llseek,
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};
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2017-11-07 01:09:55 +08:00
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/* Expose resource table content via debugfs */
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static int rproc_rsc_table_show(struct seq_file *seq, void *p)
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{
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static const char * const types[] = {"carveout", "devmem", "trace", "vdev"};
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struct rproc *rproc = seq->private;
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struct resource_table *table = rproc->table_ptr;
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struct fw_rsc_carveout *c;
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struct fw_rsc_devmem *d;
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struct fw_rsc_trace *t;
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struct fw_rsc_vdev *v;
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int i, j;
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if (!table) {
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seq_puts(seq, "No resource table found\n");
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return 0;
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}
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for (i = 0; i < table->num; i++) {
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int offset = table->offset[i];
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struct fw_rsc_hdr *hdr = (void *)table + offset;
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void *rsc = (void *)hdr + sizeof(*hdr);
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switch (hdr->type) {
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case RSC_CARVEOUT:
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c = rsc;
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seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]);
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seq_printf(seq, " Device Address 0x%x\n", c->da);
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seq_printf(seq, " Physical Address 0x%x\n", c->pa);
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seq_printf(seq, " Length 0x%x Bytes\n", c->len);
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seq_printf(seq, " Flags 0x%x\n", c->flags);
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seq_printf(seq, " Reserved (should be zero) [%d]\n", c->reserved);
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seq_printf(seq, " Name %s\n\n", c->name);
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break;
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case RSC_DEVMEM:
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d = rsc;
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seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]);
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seq_printf(seq, " Device Address 0x%x\n", d->da);
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seq_printf(seq, " Physical Address 0x%x\n", d->pa);
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seq_printf(seq, " Length 0x%x Bytes\n", d->len);
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seq_printf(seq, " Flags 0x%x\n", d->flags);
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seq_printf(seq, " Reserved (should be zero) [%d]\n", d->reserved);
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seq_printf(seq, " Name %s\n\n", d->name);
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break;
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case RSC_TRACE:
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t = rsc;
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seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]);
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seq_printf(seq, " Device Address 0x%x\n", t->da);
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seq_printf(seq, " Length 0x%x Bytes\n", t->len);
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seq_printf(seq, " Reserved (should be zero) [%d]\n", t->reserved);
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seq_printf(seq, " Name %s\n\n", t->name);
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break;
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case RSC_VDEV:
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v = rsc;
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seq_printf(seq, "Entry %d is of type %s\n", i, types[hdr->type]);
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seq_printf(seq, " ID %d\n", v->id);
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seq_printf(seq, " Notify ID %d\n", v->notifyid);
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seq_printf(seq, " Device features 0x%x\n", v->dfeatures);
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seq_printf(seq, " Guest features 0x%x\n", v->gfeatures);
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seq_printf(seq, " Config length 0x%x\n", v->config_len);
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seq_printf(seq, " Status 0x%x\n", v->status);
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seq_printf(seq, " Number of vrings %d\n", v->num_of_vrings);
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seq_printf(seq, " Reserved (should be zero) [%d][%d]\n\n",
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v->reserved[0], v->reserved[1]);
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for (j = 0; j < v->num_of_vrings; j++) {
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seq_printf(seq, " Vring %d\n", j);
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seq_printf(seq, " Device Address 0x%x\n", v->vring[j].da);
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seq_printf(seq, " Alignment %d\n", v->vring[j].align);
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seq_printf(seq, " Number of buffers %d\n", v->vring[j].num);
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seq_printf(seq, " Notify ID %d\n", v->vring[j].notifyid);
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seq_printf(seq, " Physical Address 0x%x\n\n",
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v->vring[j].pa);
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}
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break;
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default:
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2018-07-06 20:38:27 +08:00
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seq_printf(seq, "Unknown resource type found: %d [hdr: %pK]\n",
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2017-11-07 01:09:55 +08:00
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hdr->type, hdr);
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break;
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}
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}
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return 0;
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}
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static int rproc_rsc_table_open(struct inode *inode, struct file *file)
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{
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return single_open(file, rproc_rsc_table_show, inode->i_private);
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}
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static const struct file_operations rproc_rsc_table_ops = {
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.open = rproc_rsc_table_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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2017-11-07 01:09:56 +08:00
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/* Expose carveout content via debugfs */
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static int rproc_carveouts_show(struct seq_file *seq, void *p)
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{
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struct rproc *rproc = seq->private;
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struct rproc_mem_entry *carveout;
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list_for_each_entry(carveout, &rproc->carveouts, node) {
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seq_puts(seq, "Carveout memory entry:\n");
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2018-07-27 21:14:39 +08:00
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seq_printf(seq, "\tName: %s\n", carveout->name);
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2018-07-06 20:38:27 +08:00
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seq_printf(seq, "\tVirtual address: %pK\n", carveout->va);
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2017-11-07 01:09:56 +08:00
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seq_printf(seq, "\tDMA address: %pad\n", &carveout->dma);
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seq_printf(seq, "\tDevice address: 0x%x\n", carveout->da);
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seq_printf(seq, "\tLength: 0x%x Bytes\n\n", carveout->len);
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}
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return 0;
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}
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static int rproc_carveouts_open(struct inode *inode, struct file *file)
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{
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return single_open(file, rproc_carveouts_show, inode->i_private);
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}
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static const struct file_operations rproc_carveouts_ops = {
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.open = rproc_carveouts_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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2011-10-20 23:24:15 +08:00
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void rproc_remove_trace_file(struct dentry *tfile)
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{
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debugfs_remove(tfile);
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}
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struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
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2019-01-10 21:49:10 +08:00
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struct rproc_debug_trace *trace)
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2011-10-20 23:24:15 +08:00
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{
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struct dentry *tfile;
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2016-08-13 07:42:20 +08:00
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tfile = debugfs_create_file(name, 0400, rproc->dbg_dir, trace,
|
|
|
|
&trace_rproc_ops);
|
2011-10-20 23:24:15 +08:00
|
|
|
if (!tfile) {
|
remoteproc: maintain a generic child device for each rproc
For each registered rproc, maintain a generic remoteproc device whose
parent is the low level platform-specific device (commonly a pdev, but
it may certainly be any other type of device too).
With this in hand, the resulting device hierarchy might then look like:
omap-rproc.0
|
- remoteproc0 <---- new !
|
- virtio0
|
- virtio1
|
- rpmsg0
|
- rpmsg1
|
- rpmsg2
Where:
- omap-rproc.0 is the low level device that's bound to the
driver which invokes rproc_register()
- remoteproc0 is the result of this patch, and will be added by the
remoteproc framework when rproc_register() is invoked
- virtio0 and virtio1 are vdevs that are registered by remoteproc
when it realizes that they are supported by the firmware
of the physical remote processor represented by omap-rproc.0
- rpmsg0, rpmsg1 and rpmsg2 are rpmsg devices that represent rpmsg
channels, and are registerd by the rpmsg bus when it gets notified
about their existence
Technically, this patch:
- changes 'struct rproc' to contain this generic remoteproc.x device
- creates a new "remoteproc" type, to which this new generic remoteproc.x
device belong to.
- adds a super simple enumeration method for the indices of the
remoteproc.x devices
- updates all dev_* messaging to use the generic remoteproc.x device
instead of the low level platform-specific device
- updates all dma_* allocations to use the parent of remoteproc.x (where
the platform-specific memory pools, most commonly CMA, are to be found)
Adding this generic device has several merits:
- we can now add remoteproc runtime PM support simply by hooking onto the
new "remoteproc" type
- all remoteproc log messages will now carry a common name prefix
instead of having a platform-specific one
- having a device as part of the rproc struct makes it possible to simplify
refcounting (see subsequent patch)
Thanks to Stephen Boyd <sboyd@codeaurora.org> for suggesting and
discussing these ideas in one of the remoteproc review threads and
to Fernando Guzman Lugo <fernando.lugo@ti.com> for trying them out
with the (upcoming) runtime PM support for remoteproc.
Cc: Fernando Guzman Lugo <fernando.lugo@ti.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
2012-05-31 03:01:25 +08:00
|
|
|
dev_err(&rproc->dev, "failed to create debugfs trace entry\n");
|
2011-10-20 23:24:15 +08:00
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return tfile;
|
|
|
|
}
|
|
|
|
|
|
|
|
void rproc_delete_debug_dir(struct rproc *rproc)
|
|
|
|
{
|
|
|
|
if (!rproc->dbg_dir)
|
|
|
|
return;
|
|
|
|
|
|
|
|
debugfs_remove_recursive(rproc->dbg_dir);
|
|
|
|
}
|
|
|
|
|
|
|
|
void rproc_create_debug_dir(struct rproc *rproc)
|
|
|
|
{
|
remoteproc: maintain a generic child device for each rproc
For each registered rproc, maintain a generic remoteproc device whose
parent is the low level platform-specific device (commonly a pdev, but
it may certainly be any other type of device too).
With this in hand, the resulting device hierarchy might then look like:
omap-rproc.0
|
- remoteproc0 <---- new !
|
- virtio0
|
- virtio1
|
- rpmsg0
|
- rpmsg1
|
- rpmsg2
Where:
- omap-rproc.0 is the low level device that's bound to the
driver which invokes rproc_register()
- remoteproc0 is the result of this patch, and will be added by the
remoteproc framework when rproc_register() is invoked
- virtio0 and virtio1 are vdevs that are registered by remoteproc
when it realizes that they are supported by the firmware
of the physical remote processor represented by omap-rproc.0
- rpmsg0, rpmsg1 and rpmsg2 are rpmsg devices that represent rpmsg
channels, and are registerd by the rpmsg bus when it gets notified
about their existence
Technically, this patch:
- changes 'struct rproc' to contain this generic remoteproc.x device
- creates a new "remoteproc" type, to which this new generic remoteproc.x
device belong to.
- adds a super simple enumeration method for the indices of the
remoteproc.x devices
- updates all dev_* messaging to use the generic remoteproc.x device
instead of the low level platform-specific device
- updates all dma_* allocations to use the parent of remoteproc.x (where
the platform-specific memory pools, most commonly CMA, are to be found)
Adding this generic device has several merits:
- we can now add remoteproc runtime PM support simply by hooking onto the
new "remoteproc" type
- all remoteproc log messages will now carry a common name prefix
instead of having a platform-specific one
- having a device as part of the rproc struct makes it possible to simplify
refcounting (see subsequent patch)
Thanks to Stephen Boyd <sboyd@codeaurora.org> for suggesting and
discussing these ideas in one of the remoteproc review threads and
to Fernando Guzman Lugo <fernando.lugo@ti.com> for trying them out
with the (upcoming) runtime PM support for remoteproc.
Cc: Fernando Guzman Lugo <fernando.lugo@ti.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
2012-05-31 03:01:25 +08:00
|
|
|
struct device *dev = &rproc->dev;
|
2011-10-20 23:24:15 +08:00
|
|
|
|
|
|
|
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,
|
2016-08-13 07:42:20 +08:00
|
|
|
rproc, &rproc_name_ops);
|
2012-09-18 17:26:35 +08:00
|
|
|
debugfs_create_file("recovery", 0400, rproc->dbg_dir,
|
2016-08-13 07:42:20 +08:00
|
|
|
rproc, &rproc_recovery_ops);
|
2018-11-07 23:26:01 +08:00
|
|
|
debugfs_create_file("crash", 0200, rproc->dbg_dir,
|
|
|
|
rproc, &rproc_crash_ops);
|
2017-11-07 01:09:55 +08:00
|
|
|
debugfs_create_file("resource_table", 0400, rproc->dbg_dir,
|
|
|
|
rproc, &rproc_rsc_table_ops);
|
2017-11-07 01:09:56 +08:00
|
|
|
debugfs_create_file("carveout_memories", 0400, rproc->dbg_dir,
|
|
|
|
rproc, &rproc_carveouts_ops);
|
2011-10-20 23:24:15 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
2013-06-30 16:33:05 +08:00
|
|
|
debugfs_remove(rproc_dbg);
|
2011-10-20 23:24:15 +08:00
|
|
|
}
|