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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2025 Google LLC.
//! Keep track of statistics for binder_logs.
use crate::defs::*;
use core::sync::atomic::{AtomicU32, Ordering::Relaxed};
use kernel::{ioctl::_IOC_NR, seq_file::SeqFile, seq_print};
const BC_COUNT: usize = _IOC_NR(BC_REPLY_SG) as usize + 1;
const BR_COUNT: usize = _IOC_NR(BR_TRANSACTION_PENDING_FROZEN) as usize + 1;
pub(crate) static GLOBAL_STATS: BinderStats = BinderStats::new();
pub(crate) struct BinderStats {
bc: [AtomicU32; BC_COUNT],
br: [AtomicU32; BR_COUNT],
}
impl BinderStats {
pub(crate) const fn new() -> Self {
#[expect(clippy::declare_interior_mutable_const)]
const ZERO: AtomicU32 = AtomicU32::new(0);
Self {
bc: [ZERO; BC_COUNT],
br: [ZERO; BR_COUNT],
}
}
pub(crate) fn inc_bc(&self, bc: u32) {
let idx = _IOC_NR(bc) as usize;
if let Some(bc_ref) = self.bc.get(idx) {
bc_ref.fetch_add(1, Relaxed);
}
}
pub(crate) fn inc_br(&self, br: u32) {
let idx = _IOC_NR(br) as usize;
if let Some(br_ref) = self.br.get(idx) {
br_ref.fetch_add(1, Relaxed);
}
}
pub(crate) fn debug_print(&self, prefix: &str, m: &SeqFile) {
for (i, cnt) in self.bc.iter().enumerate() {
let cnt = cnt.load(Relaxed);
if cnt > 0 {
seq_print!(m, "{}{}: {}\n", prefix, command_string(i), cnt);
}
}
for (i, cnt) in self.br.iter().enumerate() {
let cnt = cnt.load(Relaxed);
if cnt > 0 {
seq_print!(m, "{}{}: {}\n", prefix, return_string(i), cnt);
}
}
}
}
mod strings {
use core::str::from_utf8_unchecked;
use kernel::str::CStr;
extern "C" {
static binder_command_strings: [*const u8; super::BC_COUNT];
static binder_return_strings: [*const u8; super::BR_COUNT];
}
pub(super) fn command_string(i: usize) -> &'static str {
// SAFETY: Accessing `binder_command_strings` is always safe.
let c_str_ptr = unsafe { binder_command_strings[i] };
// SAFETY: The `binder_command_strings` array only contains nul-terminated strings.
let bytes = unsafe { CStr::from_char_ptr(c_str_ptr) }.as_bytes();
// SAFETY: The `binder_command_strings` array only contains strings with ascii-chars.
unsafe { from_utf8_unchecked(bytes) }
}
pub(super) fn return_string(i: usize) -> &'static str {
// SAFETY: Accessing `binder_return_strings` is always safe.
let c_str_ptr = unsafe { binder_return_strings[i] };
// SAFETY: The `binder_command_strings` array only contains nul-terminated strings.
let bytes = unsafe { CStr::from_char_ptr(c_str_ptr) }.as_bytes();
// SAFETY: The `binder_command_strings` array only contains strings with ascii-chars.
unsafe { from_utf8_unchecked(bytes) }
}
}
use strings::{command_string, return_string};
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