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[66.111.4.227]) by smtp.gmail.com with ESMTPSA id cz52-20020a05620a36f400b0078a43996ab7sm267608qkb.1.2024.03.22.16.39.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Mar 2024 16:39:10 -0700 (PDT) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailauth.nyi.internal (Postfix) with ESMTP id E694E27C005B; Fri, 22 Mar 2024 19:39:09 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute5.internal (MEProxy); Fri, 22 Mar 2024 19:39:09 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvledruddtfedgudegucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvvefufffkofgjfhgggfestdekredtredttdenucfhrhhomhepuehoqhhu nhcuhfgvnhhguceosghoqhhunhdrfhgvnhhgsehgmhgrihhlrdgtohhmqeenucggtffrrg htthgvrhhnpeegleejiedthedvheeggfejveefjeejkefgveffieeujefhueeigfegueeh geeggfenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpe gsohhquhhnodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdeiledvgeehtdei gedqudejjeekheehhedvqdgsohhquhhnrdhfvghngheppehgmhgrihhlrdgtohhmsehfih igmhgvrdhnrghmvg X-ME-Proxy: Feedback-ID: iad51458e:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Fri, 22 Mar 2024 19:39:08 -0400 (EDT) From: Boqun Feng To: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, llvm@lists.linux.dev Cc: Miguel Ojeda , Alex Gaynor , Wedson Almeida Filho , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Alan Stern , Andrea Parri , Will Deacon , Peter Zijlstra , Nicholas Piggin , David Howells , Jade Alglave , Luc Maranget , "Paul E. 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Peter Anvin" , Catalin Marinas , torvalds@linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org Subject: [WIP 2/3] rust: atomic: Add ARM64 fetch_add_relaxed() Date: Fri, 22 Mar 2024 16:38:37 -0700 Message-ID: <20240322233838.868874-3-boqun.feng@gmail.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240322233838.868874-1-boqun.feng@gmail.com> References: <20240322233838.868874-1-boqun.feng@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240322_163913_909980_F590A6E8 X-CRM114-Status: GOOD ( 14.88 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Signed-off-by: Boqun Feng --- rust/kernel/sync/atomic/arch.rs | 6 ++++++ rust/kernel/sync/atomic/arch/arm64.rs | 26 ++++++++++++++++++++++++++ 2 files changed, 32 insertions(+) create mode 100644 rust/kernel/sync/atomic/arch/arm64.rs diff --git a/rust/kernel/sync/atomic/arch.rs b/rust/kernel/sync/atomic/arch.rs index 3eb5a103a69a..fc280f229237 100644 --- a/rust/kernel/sync/atomic/arch.rs +++ b/rust/kernel/sync/atomic/arch.rs @@ -5,5 +5,11 @@ #[cfg(CONFIG_X86)] pub(crate) use x86::*; +#[cfg(CONFIG_ARM64)] +pub(crate) use arm64::*; + #[cfg(CONFIG_X86)] pub(crate) mod x86; + +#[cfg(CONFIG_ARM64)] +pub(crate) mod arm64; diff --git a/rust/kernel/sync/atomic/arch/arm64.rs b/rust/kernel/sync/atomic/arch/arm64.rs new file mode 100644 index 000000000000..438f37cf7df6 --- /dev/null +++ b/rust/kernel/sync/atomic/arch/arm64.rs @@ -0,0 +1,26 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! ARM64 implementation for atomic and barrier primitives. + +use core::arch::asm; +use core::cell::UnsafeCell; + +pub(crate) fn i32_fetch_add_relaxed(v: &UnsafeCell, i: i32) -> i32 { + let mut result; + unsafe { + asm!( + "prfm pstl1strm, [{v}]", + "1: ldxr {result:w}, [{v}]", + "add {val:w}, {result:w}, {i:w}", + "stxr {tmp:w}, {val:w}, [{v}]", + "cbnz {tmp:w}, 1b", + result = out(reg) result, + tmp = out(reg) _, + val = out(reg) _, + v = in(reg) v.get(), + i = in(reg) i, + ) + } + + result +} -- 2.44.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel