Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linuxgrafted

Pull I3C updates from Alexandre Belloni:
 "A new driver this cycle, for the AMD AXI I3C controller.

  There are also new features such as IBI wakeup support, SETAASA device
  discovery and ACPI support for the the DAA methods, meaning we can now
  communicate with the SPD devices on DDR5 modules.

  New driver:
   - AMD AXI I3C master controller

  Subsystem:
   - I3C Common Command Code (CCC) handling improvements, especially
     around GET CCCs
   - SETAASA device discovery support
   - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as
     well as I2C devices on I3C bus
   - IBI-based wakeup support

  Drivers:
   - dw: SETAASA support
   - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C
     controller support, PIO queue management support for HCI v1.2
   - renesas: improve suspend to RAM support, add runtime PM support"

* tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits)
  i3c: dw: reduce do_daa time if there's no client
  i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller
  i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2
  i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode
  i3c: dw: rename "pclk" to "apb" to match dt-binding
  i3c: dw: make struct dw_i3c_cmd smaller
  i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding
  i3c: renesas: Don't register devices when ENTDAA times out
  i3c: master: dw-i3c-master: fix OD timing for first broadcast
  i3c: mipi-i3c-hci: Advertise IBI wakeup capability
  i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev()
  i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI
  i3c: master: Reject IBI requests from non-IBI-capable devices
  i3c: master: Add helper to query bus wakeup requirements
  i3c: master: Report wakeup events for IBIs
  i3c: master: Support IBI-based wakeup capability
  i3c: master: Fix potential UAF in i3c_device_match()
  i3c: master: Fix potential UAF in i3c_device_uevent()
  i3c: Make dev->desc locking assumptions explicit
  i3c: master: Fix use-after-free of master->this
  ...

1 files changed, 172 insertions, 0 deletions

diff --git a/rust/macros/kunit.rs b/rust/macros/kunit.rs
new file mode 100644
index 000000000..ae20ed676
--- /dev/null
+++ b/rust/macros/kunit.rs
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0
+
+//! Procedural macro to run KUnit tests using a user-space like syntax.
+//!
+//! Copyright (c) 2023 José Expósito <jose.exposito89@gmail.com>
+
+use std::ffi::CString;
+
+use proc_macro2::TokenStream;
+use quote::{
+    format_ident,
+    quote,
+    ToTokens, //
+};
+use syn::{
+    parse_quote,
+    Error,
+    Ident,
+    Item,
+    ItemMod,
+    LitCStr,
+    Result, //
+};
+
+pub(crate) fn kunit_tests(test_suite: Ident, mut module: ItemMod) -> Result<TokenStream> {
+    if test_suite.to_string().len() > 255 {
+        return Err(Error::new_spanned(
+            test_suite,
+            "test suite names cannot exceed the maximum length of 255 bytes",
+        ));
+    }
+
+    // We cannot handle modules that defer to another file (e.g. `mod foo;`).
+    let Some((module_brace, module_items)) = module.content.take() else {
+        Err(Error::new_spanned(
+            module,
+            "`#[kunit_tests(test_name)]` attribute should only be applied to inline modules",
+        ))?
+    };
+
+    // Make the entire module gated behind `CONFIG_KUNIT`.
+    module
+        .attrs
+        .insert(0, parse_quote!(#[cfg(CONFIG_KUNIT="y")]));
+
+    let mut processed_items = Vec::new();
+    let mut test_cases = Vec::new();
+
+    // Generate the test KUnit test suite and a test case for each `#[test]`.
+    //
+    // The code generated for the following test module:
+    //
+    // ```
+    // #[kunit_tests(kunit_test_suit_name)]
+    // mod tests {
+    //     #[test]
+    //     fn foo() {
+    //         assert_eq!(1, 1);
+    //     }
+    //
+    //     #[test]
+    //     fn bar() {
+    //         assert_eq!(2, 2);
+    //     }
+    // }
+    // ```
+    //
+    // Looks like:
+    //
+    // ```
+    // unsafe extern "C" fn kunit_rust_wrapper_foo(_test: *mut ::kernel::bindings::kunit) { foo(); }
+    // unsafe extern "C" fn kunit_rust_wrapper_bar(_test: *mut ::kernel::bindings::kunit) { bar(); }
+    //
+    // static mut TEST_CASES: [::kernel::bindings::kunit_case; 3] = [
+    //     ::kernel::kunit::kunit_case(c"foo", kunit_rust_wrapper_foo),
+    //     ::kernel::kunit::kunit_case(c"bar", kunit_rust_wrapper_bar),
+    //     ::pin_init::zeroed(),
+    // ];
+    //
+    // ::kernel::kunit_unsafe_test_suite!(kunit_test_suit_name, TEST_CASES);
+    // ```
+    //
+    // Non-function items (e.g. imports) are preserved.
+    for item in module_items {
+        let Item::Fn(mut f) = item else {
+            processed_items.push(item);
+            continue;
+        };
+
+        if f.attrs
+            .extract_if(.., |attr| attr.path().is_ident("test"))
+            .count()
+            == 0
+        {
+            processed_items.push(Item::Fn(f));
+            continue;
+        }
+
+        let test = f.sig.ident.clone();
+
+        // Retrieve `#[cfg]` applied on the function which needs to be present on derived items too.
+        let cfg_attrs: Vec<_> = f
+            .attrs
+            .iter()
+            .filter(|attr| attr.path().is_ident("cfg"))
+            .cloned()
+            .collect();
+
+        // Before the test, override usual `assert!` and `assert_eq!` macros with ones that call
+        // KUnit instead.
+        let test_str = test.to_string();
+        let path = CString::new(crate::helpers::file()).expect("file path cannot contain NUL");
+        processed_items.push(parse_quote! {
+            #[allow(unused)]
+            macro_rules! assert {
+                ($cond:expr $(,)?) => {{
+                    kernel::kunit_assert!(#test_str, #path, 0, $cond);
+                }}
+            }
+        });
+        processed_items.push(parse_quote! {
+            #[allow(unused)]
+            macro_rules! assert_eq {
+                ($left:expr, $right:expr $(,)?) => {{
+                    kernel::kunit_assert_eq!(#test_str, #path, 0, $left, $right);
+                }}
+            }
+        });
+
+        // Add back the test item.
+        processed_items.push(Item::Fn(f));
+
+        let kunit_wrapper_fn_name = format_ident!("kunit_rust_wrapper_{test}");
+        let test_cstr = LitCStr::new(
+            &CString::new(test_str.as_str()).expect("identifier cannot contain NUL"),
+            test.span(),
+        );
+        processed_items.push(parse_quote! {
+            unsafe extern "C" fn #kunit_wrapper_fn_name(_test: *mut ::kernel::bindings::kunit) {
+                (*_test).status = ::kernel::bindings::kunit_status_KUNIT_SKIPPED;
+
+                // Append any `cfg` attributes the user might have written on their tests so we
+                // don't attempt to call them when they are `cfg`'d out. An extra `use` is used
+                // here to reduce the length of the assert message.
+                #(#cfg_attrs)*
+                {
+                    (*_test).status = ::kernel::bindings::kunit_status_KUNIT_SUCCESS;
+                    use ::kernel::kunit::is_test_result_ok;
+                    assert!(is_test_result_ok(#test()));
+                }
+            }
+        });
+
+        test_cases.push(quote!(
+            ::kernel::kunit::kunit_case(#test_cstr, #kunit_wrapper_fn_name)
+        ));
+    }
+
+    let num_tests_plus_1 = test_cases.len() + 1;
+    processed_items.push(parse_quote! {
+        static mut TEST_CASES: [::kernel::bindings::kunit_case; #num_tests_plus_1] = [
+            #(#test_cases,)*
+            ::pin_init::zeroed(),
+        ];
+    });
+    processed_items.push(parse_quote! {
+        ::kernel::kunit_unsafe_test_suite!(#test_suite, TEST_CASES);
+    });
+
+    module.content = Some((module_brace, processed_items));
+    Ok(module.to_token_stream())
+}