1 // SPDX-License-Identifier: GPL-2.0 2 3 // Copyright (C) 2025 Google LLC. 4 5 //! Keep track of statistics for binder_logs. 6 7 use crate::defs::*; 8 use core::sync::atomic::{AtomicU32, Ordering::Relaxed}; 9 use kernel::{ioctl::_IOC_NR, seq_file::SeqFile, seq_print}; 10 11 const BC_COUNT: usize = _IOC_NR(BC_REPLY_SG) as usize + 1; 12 const BR_COUNT: usize = _IOC_NR(BR_TRANSACTION_PENDING_FROZEN) as usize + 1; 13 14 pub(crate) static GLOBAL_STATS: BinderStats = BinderStats::new(); 15 16 pub(crate) struct BinderStats { 17 bc: [AtomicU32; BC_COUNT], 18 br: [AtomicU32; BR_COUNT], 19 } 20 21 impl BinderStats { 22 pub(crate) const fn new() -> Self { 23 #[expect(clippy::declare_interior_mutable_const)] 24 const ZERO: AtomicU32 = AtomicU32::new(0); 25 26 Self { 27 bc: [ZERO; BC_COUNT], 28 br: [ZERO; BR_COUNT], 29 } 30 } 31 32 pub(crate) fn inc_bc(&self, bc: u32) { 33 let idx = _IOC_NR(bc) as usize; 34 if let Some(bc_ref) = self.bc.get(idx) { 35 bc_ref.fetch_add(1, Relaxed); 36 } 37 } 38 39 pub(crate) fn inc_br(&self, br: u32) { 40 let idx = _IOC_NR(br) as usize; 41 if let Some(br_ref) = self.br.get(idx) { 42 br_ref.fetch_add(1, Relaxed); 43 } 44 } 45 46 pub(crate) fn debug_print(&self, prefix: &str, m: &SeqFile) { 47 for (i, cnt) in self.bc.iter().enumerate() { 48 let cnt = cnt.load(Relaxed); 49 if cnt > 0 { 50 seq_print!(m, "{}{}: {}\n", prefix, command_string(i), cnt); 51 } 52 } 53 for (i, cnt) in self.br.iter().enumerate() { 54 let cnt = cnt.load(Relaxed); 55 if cnt > 0 { 56 seq_print!(m, "{}{}: {}\n", prefix, return_string(i), cnt); 57 } 58 } 59 } 60 } 61 62 mod strings { 63 use core::str::from_utf8_unchecked; 64 use kernel::str::CStr; 65 66 extern "C" { 67 static binder_command_strings: [*const u8; super::BC_COUNT]; 68 static binder_return_strings: [*const u8; super::BR_COUNT]; 69 } 70 71 pub(super) fn command_string(i: usize) -> &'static str { 72 // SAFETY: Accessing `binder_command_strings` is always safe. 73 let c_str_ptr = unsafe { binder_command_strings[i] }; 74 // SAFETY: The `binder_command_strings` array only contains nul-terminated strings. 75 let bytes = unsafe { CStr::from_char_ptr(c_str_ptr) }.as_bytes(); 76 // SAFETY: The `binder_command_strings` array only contains strings with ascii-chars. 77 unsafe { from_utf8_unchecked(bytes) } 78 } 79 80 pub(super) fn return_string(i: usize) -> &'static str { 81 // SAFETY: Accessing `binder_return_strings` is always safe. 82 let c_str_ptr = unsafe { binder_return_strings[i] }; 83 // SAFETY: The `binder_command_strings` array only contains nul-terminated strings. 84 let bytes = unsafe { CStr::from_char_ptr(c_str_ptr) }.as_bytes(); 85 // SAFETY: The `binder_command_strings` array only contains strings with ascii-chars. 86 unsafe { from_utf8_unchecked(bytes) } 87 } 88 } 89 use strings::{command_string, return_string}; 90