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// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for WiFi Performance Tracker
*
* Copyright 2022 Google LLC.
*
* Author: Star Chang <starchang@google.com>
*/
#include <linux/kernel.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/timekeeping.h>
#include <linux/rtc.h>
#include "core.h"
#include "debugfs.h"
static const char *const state2str[WLAN_SCENE_MAX] = {
"Idle", "Web", "Youtube", "Low latency", "Throughput"
};
#define READ_BUF_SIZE 1024
static ssize_t action_read(struct file *file, char __user *userbuf, size_t count, loff_t *ppos)
{
struct wlan_ptracker_core *core = file->private_data;
char *buf;
int len = 0;
int i;
ssize_t ret;
buf = vmalloc(READ_BUF_SIZE);
if (!buf)
return 0;
len += scnprintf(buf + len, READ_BUF_SIZE - len,
"==== DSCP to AC mapping table ===\n");
for (i = 0 ; i < DSCP_MAX; i++) {
if (!core->dscp_to_ac[i])
continue;
len += scnprintf(buf + len, READ_BUF_SIZE - len,
"dscp[%d] : %u\n", i, core->dscp_to_ac[i]);
}
ret = simple_read_from_buffer(userbuf, count, ppos, buf, len);
vfree(buf);
return ret;
}
static void update_dscp(struct wlan_ptracker_core *core, u32 dscp, u32 ac)
{
ptracker_info(core, "dscp %d, ac: %d\n", dscp, ac);
if (dscp > DSCP_MASK)
return;
if (ac > WMM_AC_VO)
return;
core->dscp_to_ac[dscp] = ac;
}
static ssize_t action_write(struct file *file,
const char __user *buf, size_t len, loff_t *ppos)
{
struct wlan_ptracker_core *core = file->private_data;
struct wlan_ptracker_debugfs *debugfs = &core->debugfs;
u32 action;
if (kstrtouint_from_user(buf, len, 10, &action))
return -EFAULT;
/* active action */
switch (action) {
case ACTION_DSCP_UPDATE:
update_dscp(core, debugfs->dscp, debugfs->ac);
break;
default:
ptracker_err(core, "action %d is not supported!\n", action);
return -ENOTSUPP;
}
return 0;
}
static const struct file_operations dscp_ops = {
.open = simple_open,
.read = action_read,
.write = action_write,
.llseek = generic_file_llseek,
};
int wlan_ptracker_debugfs_init(struct wlan_ptracker_debugfs *debugfs)
{
struct wlan_ptracker_core *core = container_of(
debugfs, struct wlan_ptracker_core, debugfs);
debugfs->root = debugfs_create_dir("wlan_ptracker", NULL);
if (!debugfs->root)
return -ENODEV;
debugfs_create_file("action", 0600, debugfs->root, core, &dscp_ops);
debugfs_create_u32("dscp", 0600, debugfs->root, &debugfs->dscp);
debugfs_create_u32("ac", 0600, debugfs->root, &debugfs->ac);
return 0;
}
void wlan_ptracker_debugfs_exit(struct wlan_ptracker_debugfs *debugfs)
{
debugfs_remove_recursive(debugfs->root);
debugfs->root = NULL;
}
struct history_manager *wlan_ptracker_history_create(int entry_count, int entry_size)
{
struct history_manager *hm;
if (entry_count < 0 || entry_size < sizeof(struct history_entry))
return NULL;
hm = kzalloc(sizeof(struct history_manager) + entry_size * entry_count, GFP_KERNEL);
if (!hm)
return NULL;
/* initial manager */
hm->entry_count = entry_count;
hm->entry_size = entry_size;
hm->cur = 0;
hm->round = 0;
mutex_init(&hm->mutex);
return hm;
}
void wlan_ptracker_history_destroy(struct history_manager *hm)
{
if (hm)
kfree(hm);
}
void * wlan_ptracker_history_store(struct history_manager *hm, u32 state)
{
struct history_entry *entry;
if (!hm->entry_count)
return NULL;
entry = (struct history_entry *)(hm->entries + (hm->cur * hm->entry_size));
entry->state = state;
entry->valid = true;
ktime_get_real_ts64(&entry->ts);
/* update dytwt history */
mutex_lock(&hm->mutex);
hm->cur++;
if (hm->cur / hm->entry_count)
hm->round++;
hm->cur %= hm->entry_count;
mutex_unlock(&hm->mutex);
return entry;
}
static int history_get_tm(struct history_entry *entry, char *time, size_t len)
{
struct rtc_time tm;
rtc_time64_to_tm(entry->ts.tv_sec - (sys_tz.tz_minuteswest * 60), &tm);
return scnprintf(time, len, "%ptRs", &tm);
}
size_t wlan_ptracker_history_read(struct history_manager *hm, char *buf, int buf_len)
{
u8 *ptr;
struct history_entry *cur, *next;
int len = 0;
int i, j;
len += scnprintf(buf + len, buf_len - len,
"==== %s History ===\n", hm->name);
len += scnprintf(buf + len, buf_len - len,
"round: %d, cur: %d, entry len: %d, size: %d\n",
hm->round, hm->cur, hm->entry_count, hm->entry_size);
ptr = hm->entries;
for (i = 0 ; i < hm->entry_count; i++) {
cur = (struct history_entry *) ptr;
if (!cur->valid)
break;
j = (i + hm->entry_count + 1) % hm->entry_count;
next = (struct history_entry *)(hm->entries + (j * hm->entry_size));
len += scnprintf(buf + len, buf_len - len, "%02d: ", i);
len += history_get_tm(cur, buf + len, buf_len - len);
len += scnprintf(buf + len, buf_len - len, "%12s =>", state2str[cur->state]);
if (hm->priv_read)
len += hm->priv_read(cur, next->valid ? next : NULL, buf + len,
buf_len - len);
len += scnprintf(buf + len, buf_len - len, "\n");
ptr += hm->entry_size;
}
return len;
}
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