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Wed, 30 Oct 2024 09:05:02 -0700 (PDT) Date: Wed, 30 Oct 2024 16:04:26 +0000 In-Reply-To: <20241030-tracepoint-v12-0-eec7f0f8ad22@google.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241030-tracepoint-v12-0-eec7f0f8ad22@google.com> X-Developer-Key: i=aliceryhl@google.com; a=openpgp; fpr=49F6C1FAA74960F43A5B86A1EE7A392FDE96209F X-Developer-Signature: v=1; a=openpgp-sha256; l=4317; i=aliceryhl@google.com; h=from:subject:message-id; bh=6E1WLLql+lELSHgkVX0zcOXTthdmIBZjrDBlYLHV8VE=; b=owEBbQKS/ZANAwAKAQRYvu5YxjlGAcsmYgBnIlkij9ArugE0ISxftxYGap6R5sPzZ34MTem3X YAfJWcND5GJAjMEAAEKAB0WIQSDkqKUTWQHCvFIvbIEWL7uWMY5RgUCZyJZIgAKCRAEWL7uWMY5 RtyHEACM0N0SSCrGkN7dCmCzwyY3cCJ5+/ZS8EiisT++meOQqOellWnDP/PWSwMYNbKLQj01avU DJklGMUi2rgWkgWLWUw3GrMRK/18oqPSId9Yq7MRtYctCEBNv4faTk2F5MMNKzh2HAbp896wyn/ +OUeotpRorcYeqS+fhvGRpZUsOt1I4hRqeCODknNXG7YJfnveRdyeX19Nqoc5Nmrr/Uxd/dfeSt +izMRDn9xRkm4BNbNX1yq7vxHnxw03+3+w2BuTdWsH+PLbA+jLAlxlYckKuVq3d81QH7/gRF5yo 7Bmw48EA4n5UMfHLSMXW6eu6yyNK/4rXD98UpVyaC0tmhhzevjQCifkvST3x0kK43p1ik/cpkal MSJn+2cTR1oSj+CjlBikD10FZecb3FGmhyvrlttp71kJqGbsuhJeKmPlg+/CLdw3SVqr8fxyI1U 8AokMAWfRmWN/BaLCLAHONLfPeoaVdg79U5+cIJeaAipIbx41O8Zan7uEfKAwyK8BTa/ialGsSi UvFlK8LwyS8au0VyyKicDxE7Tswji9RMwtfM4BmxSauM4ltVnXcRWuSQpV3V2W7tJkLqtZu77EN Kyr2CONG7Heet1+fPXd8k35lT0KGZoZdqTppbnog7dJLj1eDulTzDBYyiVEbnrBibgMGBS/dBZA Bfq3ja4N4Z6u9OQ== X-Mailer: b4 0.13.0 Message-ID: <20241030-tracepoint-v12-3-eec7f0f8ad22@google.com> Subject: [PATCH v12 3/5] rust: samples: add tracepoint to Rust sample From: Alice Ryhl To: Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Peter Zijlstra , Josh Poimboeuf , Jason Baron , Ard Biesheuvel , Miguel Ojeda , Alex Gaynor , Wedson Almeida Filho , Boqun Feng , Gary Guo , " =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= " , Benno Lossin , Andreas Hindborg Cc: linux-trace-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, Arnd Bergmann , linux-arch@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Sean Christopherson , Uros Bizjak , Catalin Marinas , Will Deacon , Marc Zyngier , Oliver Upton , Mark Rutland , Ryan Roberts , Fuad Tabba , linux-arm-kernel@lists.infradead.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , Anup Patel , Andrew Jones , Alexandre Ghiti , Conor Dooley , Samuel Holland , linux-riscv@lists.infradead.org, Huacai Chen , WANG Xuerui , Bibo Mao , Tiezhu Yang , Andrew Morton , Tianrui Zhao , loongarch@lists.linux.dev, Alice Ryhl This updates the Rust printing sample to invoke a tracepoint. This ensures that we have a user in-tree from the get-go even though the patch is being merged before its real user. Reviewed-by: Boqun Feng Signed-off-by: Alice Ryhl --- MAINTAINERS | 1 + include/trace/events/rust_sample.h | 31 +++++++++++++++++++++++++++++++ rust/bindings/bindings_helper.h | 1 + samples/rust/Makefile | 3 ++- samples/rust/rust_print.rs | 18 ++++++++++++++++++ samples/rust/rust_print_events.c | 8 ++++++++ 6 files changed, 61 insertions(+), 1 deletion(-) diff --git a/MAINTAINERS b/MAINTAINERS index a097afd76ded..a9b71411d77a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -20223,6 +20223,7 @@ C: zulip://rust-for-linux.zulipchat.com P: https://rust-for-linux.com/contributing T: git https://github.com/Rust-for-Linux/linux.git rust-next F: Documentation/rust/ +F: include/trace/events/rust_sample.h F: rust/ F: samples/rust/ F: scripts/*rust* diff --git a/include/trace/events/rust_sample.h b/include/trace/events/rust_sample.h new file mode 100644 index 000000000000..dbc80ca2e465 --- /dev/null +++ b/include/trace/events/rust_sample.h @@ -0,0 +1,31 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Tracepoints for `samples/rust/rust_print.rs`. + * + * Copyright (C) 2024 Google, Inc. + */ + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM rust_sample + +#if !defined(_RUST_SAMPLE_TRACE_H) || defined(TRACE_HEADER_MULTI_READ) +#define _RUST_SAMPLE_TRACE_H + +#include + +TRACE_EVENT(rust_sample_loaded, + TP_PROTO(int magic_number), + TP_ARGS(magic_number), + TP_STRUCT__entry( + __field(int, magic_number) + ), + TP_fast_assign( + __entry->magic_number = magic_number; + ), + TP_printk("magic=%d", __entry->magic_number) +); + +#endif /* _RUST_SAMPLE_TRACE_H */ + +/* This part must be outside protection */ +#include diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h index 752572e638a6..b072c197ce9e 100644 --- a/rust/bindings/bindings_helper.h +++ b/rust/bindings/bindings_helper.h @@ -23,6 +23,7 @@ #include #include #include +#include /* `bindgen` gets confused at certain things. */ const size_t RUST_CONST_HELPER_ARCH_SLAB_MINALIGN = ARCH_SLAB_MINALIGN; diff --git a/samples/rust/Makefile b/samples/rust/Makefile index 03086dabbea4..f29280ec4820 100644 --- a/samples/rust/Makefile +++ b/samples/rust/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 +ccflags-y += -I$(src) # needed for trace events obj-$(CONFIG_SAMPLE_RUST_MINIMAL) += rust_minimal.o -obj-$(CONFIG_SAMPLE_RUST_PRINT) += rust_print.o +obj-$(CONFIG_SAMPLE_RUST_PRINT) += rust_print.o rust_print_events.o subdir-$(CONFIG_SAMPLE_RUST_HOSTPROGS) += hostprogs diff --git a/samples/rust/rust_print.rs b/samples/rust/rust_print.rs index 6eabb0d79ea3..6d14b08cac1c 100644 --- a/samples/rust/rust_print.rs +++ b/samples/rust/rust_print.rs @@ -69,6 +69,8 @@ fn init(_module: &'static ThisModule) -> Result { arc_print()?; + trace::trace_rust_sample_loaded(42); + Ok(RustPrint) } } @@ -78,3 +80,19 @@ fn drop(&mut self) { pr_info!("Rust printing macros sample (exit)\n"); } } + +mod trace { + use core::ffi::c_int; + + kernel::declare_trace! { + /// # Safety + /// + /// Always safe to call. + unsafe fn rust_sample_loaded(magic: c_int); + } + + pub(crate) fn trace_rust_sample_loaded(magic: i32) { + // SAFETY: Always safe to call. + unsafe { rust_sample_loaded(magic as c_int) } + } +} diff --git a/samples/rust/rust_print_events.c b/samples/rust/rust_print_events.c new file mode 100644 index 000000000000..a9169ff0edf1 --- /dev/null +++ b/samples/rust/rust_print_events.c @@ -0,0 +1,8 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2024 Google LLC + */ + +#define CREATE_TRACE_POINTS +#define CREATE_RUST_TRACE_POINTS +#include