From 0102c8c7fdfc4bd700971daff2b94470f4eafae4 Mon Sep 17 00:00:00 2001
From: Dapeng Mi <dapeng1.mi@linux.intel.com>
Date: Thu, 17 Sep 2026 09:52:33 +0800
Subject: perf/x86/intel: Rename DMR offcore_rsp attribute to offmodule_rsp

DMR introduces Offmodule Response events in place of the legacy
Offcore Response events, but it still exposes the inherited
offcore_rsp PMU attribute for programming the corresponding MSR data.

Rename the DMR PMU attribute to offmodule_rsp so the sysfs interface
matches the underlying event name and avoids user & tooling confusion.

Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://patch.msgid.link/20260917015234.981153-12-dapeng1.mi@linux.intel.com
---
 rust/ffi.rs | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 rust/ffi.rs

(limited to 'rust/ffi.rs')

diff --git a/rust/ffi.rs b/rust/ffi.rs
new file mode 100644
index 000000000..f961e9728
--- /dev/null
+++ b/rust/ffi.rs
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Foreign function interface (FFI) types.
+//!
+//! This crate provides mapping from C primitive types to Rust ones.
+//!
+//! The Rust [`core`] crate provides [`core::ffi`], which maps integer types to the platform default
+//! C ABI. The kernel does not use [`core::ffi`], so it can customise the mapping that deviates from
+//! the platform default.
+
+#![no_std]
+
+macro_rules! alias {
+    ($($name:ident = $ty:ty;)*) => {$(
+        #[allow(non_camel_case_types, missing_docs)]
+        pub type $name = $ty;
+
+        // Check size compatibility with `core`.
+        const _: () = assert!(
+            ::core::mem::size_of::<$name>() == ::core::mem::size_of::<::core::ffi::$name>()
+        );
+    )*}
+}
+
+alias! {
+    // `core::ffi::c_char` is either `i8` or `u8` depending on architecture. In the kernel, we use
+    // `-funsigned-char` so it's always mapped to `u8`.
+    c_char = u8;
+
+    c_schar = i8;
+    c_uchar = u8;
+
+    c_short = i16;
+    c_ushort = u16;
+
+    c_int = i32;
+    c_uint = u32;
+
+    // In the kernel, `intptr_t` is defined to be `long` in all platforms, so we can map the type to
+    // `isize`.
+    c_long = isize;
+    c_ulong = usize;
+
+    c_longlong = i64;
+    c_ulonglong = u64;
+}
+
+pub use core::ffi::c_void;
+
+pub use core::ffi::CStr;
-- 
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