drivers/android/binder/stats.rs

Source file repositories/reference/linux-study-clean/drivers/android/binder/stats.rs

File Facts

System
Linux kernel
Corpus path
drivers/android/binder/stats.rs
Extension
.rs
Size
3039 bytes
Lines
90
Domain
Driver Families
Bucket
drivers/android
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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, CStrExt as _};

    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) }.to_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) }.to_bytes();
        // SAFETY: The `binder_command_strings` array only contains strings with ascii-chars.
        unsafe { from_utf8_unchecked(bytes) }
    }
}
use strings::{command_string, return_string};

Annotation

Implementation Notes