On Tue, Oct 29, 2024 at 10:24 AM David Gow <davidgow@xxxxxxxxxx> wrote: > > From: José Expósito <jose.exposito89@xxxxxxxxx> > > Add a couple of Rust const functions and macros to allow to develop > KUnit tests without relying on generated C code: > > - The `kunit_unsafe_test_suite!` Rust macro is similar to the > `kunit_test_suite` C macro. It requires a NULL-terminated array of > test cases (see below). > - The `kunit_case` Rust function is similar to the `KUNIT_CASE` C macro. > It generates as case from the name and function. > - The `kunit_case_null` Rust function generates a NULL test case, which > is to be used as delimiter in `kunit_test_suite!`. > > While these functions and macros can be used on their own, a future > patch will introduce another macro to create KUnit tests using a > user-space like syntax. > > Signed-off-by: José Expósito <jose.exposito89@xxxxxxxxx> > Co-developed-by: Matt Gilbride <mattgilbride@xxxxxxxxxx> > Signed-off-by: Matt Gilbride <mattgilbride@xxxxxxxxxx> > Co-developed-by: David Gow <davidgow@xxxxxxxxxx> > Signed-off-by: David Gow <davidgow@xxxxxxxxxx> > --- > > Changes since v1: > https://lore.kernel.org/lkml/20230720-rustbind-v1-1-c80db349e3b5@xxxxxxxxxx/ > - Rebase on top of rust-next > - As a result, KUnit attributes are new set. These are hardcoded to the > defaults of "normal" speed and no module name. > - Split the kunit_case!() macro into two const functions, kunit_case() > and kunit_case_null() (for the NULL terminator). > > --- > rust/kernel/kunit.rs | 108 +++++++++++++++++++++++++++++++++++++++++++ > rust/kernel/lib.rs | 1 + > 2 files changed, 109 insertions(+) > > diff --git a/rust/kernel/kunit.rs b/rust/kernel/kunit.rs > index 824da0e9738a..fc2d259db458 100644 > --- a/rust/kernel/kunit.rs > +++ b/rust/kernel/kunit.rs > @@ -161,3 +161,111 @@ macro_rules! kunit_assert_eq { > $crate::kunit_assert!($name, $file, $diff, $left == $right); > }}; > } > + > +/// Represents an individual test case. > +/// > +/// The test case should have the signature > +/// `unsafe extern "C" fn test_case(test: *mut crate::bindings::kunit)`. > +/// > +/// The `kunit_unsafe_test_suite!` macro expects a NULL-terminated list of test cases. > +/// Use `kunit_case_null` to generate such a delimeter. > +const fn kunit_case(name: &kernel::str::CStr, run_case: unsafe extern "C" fn(*mut kernel::bindings::kunit)) -> kernel::bindings::kunit_case { This should probably say `name: &'static CStr` to require that the name lives forever. > +/// Registers a KUnit test suite. > +/// > +/// # Safety > +/// > +/// `test_cases` must be a NULL terminated array of test cases. > +/// > +/// # Examples > +/// > +/// ```ignore > +/// unsafe extern "C" fn test_fn(_test: *mut crate::bindings::kunit) { > +/// let actual = 1 + 1; > +/// let expected = 2; > +/// assert_eq!(actual, expected); > +/// } > +/// > +/// static mut KUNIT_TEST_CASE: crate::bindings::kunit_case = crate::kunit_case(name, test_fn); > +/// static mut KUNIT_NULL_CASE: crate::bindings::kunit_case = crate::kunit_case_null(); > +/// static mut KUNIT_TEST_CASES: &mut[crate::bindings::kunit_case] = unsafe { > +/// &mut[KUNIT_TEST_CASE, KUNIT_NULL_CASE] > +/// }; > +/// crate::kunit_unsafe_test_suite!(suite_name, KUNIT_TEST_CASES); > +/// ``` > +#[macro_export] > +macro_rules! kunit_unsafe_test_suite { > + ($name:ident, $test_cases:ident) => { > + const _: () = { > + static KUNIT_TEST_SUITE_NAME: [i8; 256] = { > + let name_u8 = core::stringify!($name).as_bytes(); > + let mut ret = [0; 256]; > + > + let mut i = 0; > + while i < name_u8.len() { > + ret[i] = name_u8[i] as i8; > + i += 1; > + } I assume the name must be zero-terminated? If so, you probably need to enforce that somehow, e.g. by failing if `name_u8` is longer than 255 bytes. > + > + static mut KUNIT_TEST_SUITE: core::cell::UnsafeCell<$crate::bindings::kunit_suite> = You don't actually need UnsafeCell here since it's already `static mut`. > + core::cell::UnsafeCell::new($crate::bindings::kunit_suite { > + name: KUNIT_TEST_SUITE_NAME, > + // SAFETY: User is expected to pass a correct `test_cases`, hence this macro > + // named 'unsafe'. > + test_cases: unsafe { $test_cases.as_mut_ptr() }, > + suite_init: None, > + suite_exit: None, > + init: None, > + exit: None, > + attr: $crate::bindings::kunit_attributes { > + speed: $crate::bindings::kunit_speed_KUNIT_SPEED_NORMAL, > + }, > + status_comment: [0; 256usize], > + debugfs: core::ptr::null_mut(), > + log: core::ptr::null_mut(), > + suite_init_err: 0, > + is_init: false, > + }); > + > + #[used] > + #[link_section = ".kunit_test_suites"] > + static mut KUNIT_TEST_SUITE_ENTRY: *const $crate::bindings::kunit_suite = > + // SAFETY: `KUNIT_TEST_SUITE` is static. > + unsafe { KUNIT_TEST_SUITE.get() }; If you change `KUNIT_TEST_SUITE` to not be an UnsafeCell, then you'll want to do `core::ptr::addr_of_mut!(KUNIT_TEST_SUITE` instead. > diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs > index b62451f64f6e..d662aa37070f 100644 > --- a/rust/kernel/lib.rs > +++ b/rust/kernel/lib.rs > @@ -18,6 +18,7 @@ > #![feature(inline_const)] > #![feature(lint_reasons)] > #![feature(unsize)] > +#![feature(const_mut_refs)] Is this still needed with the above changes? Alice
