From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5F89A18C031 for ; Fri, 18 Oct 2024 07:53:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729238036; cv=none; b=rT831nbfqcS8Dcq+WNbWhQYirjYL7yLm0zeu/7mNgeU7tkE6Rj62P8PNpFZh8T85qIXWoawM8WKLf7tHsc92IoKEsLJUWV6R//dCyjURYBFfk9gR1HX6gqguNhTONoJplTPRhfneggRfPaXKafvQscriwZ7M+HXSxwpXyfZMXh4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729238036; c=relaxed/simple; bh=TQ9m0wk2JZV6++i0OCfcENL4vYhhU64zD697oje3x7g=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=MlriokRBjuRUEDmVueUvjPx3mxin9UgUxBWCzo3clrq6I44VQXKmOzyUjdhSRR0Vk8TkVa3B4BEpOlGncONEF8M+WedCLMIGMLDbUAlRlbrzZZjqmEE8qLwCnvHAFwFb9COpRk1bNFyNddpDXhpzm8/C0O5tavTTRO40lrzIvso= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ardb.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=RkWjTprG; arc=none smtp.client-ip=209.85.219.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--ardb.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="RkWjTprG" Received: by mail-yb1-f201.google.com with SMTP id 3f1490d57ef6-e290947f6f8so3255328276.2 for ; Fri, 18 Oct 2024 00:53:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1729238034; x=1729842834; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=x2mv8TUZpeEH80uut1qGXx+8u/loznjO7IbL6g6IhOA=; b=RkWjTprGi8I96/a1ygHiiAXlfvKnpvJGN8HgEtwpw5giftR8YFkN+FvBvt/hC2VUnz bHb1tTyPdmjCn7gOa7gBkGm9C10eATqGjI1iWM9C1PD54JcM9KgqXSC2FkHiL6rhM24G Cd8W3SQ6x6TeEC5rnUJnPtwu05TTXQ8Tf1kMPqes3pESZJw7o8iE8tFgCTaC4weBgdfS UTye4xvK1zxcn/SMYD7RakYy9RHav1AsNeGUOa9TyAEggqW/hNIclx07NgX5aiZkUNTq AA4YzwzUurMf6FjR6xnH8YGfLA1lRpL6CKdIUlTOW8d/Vy1AZ1Tr6yAh2bV5Bb5mfTRh vu0g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729238034; x=1729842834; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=x2mv8TUZpeEH80uut1qGXx+8u/loznjO7IbL6g6IhOA=; b=AcBs9/i/EojOYsIwt2JCOOWln/JGLKfvq28FhHsfh/YeJubuP3nEsDxX4YDolz/tpc /ESO9AmKq9Z8LN5ijtez/cJq8A/BHPXkAgWi1d7wBPRwL97tQET9AP6tqUAk4HE2cB9N 7oUAYYqc6LnPzpLepgn6Eq03fGq62RrDyBx1fApUGSLFFBDnvWCknF4VgdI5Ypb/r3iS +mgkQpat9LFM/xtU9rJOWTPSQyjZUiprQJ3w6oJLFnzm4qIuwLNh3siXC6A05pFSrbmT HzFaBQqfNFoJt9r+g6mleM8QRcck/2cDaeHND6J086T3KC6qUcSi+T2SviZcyE0jN8Ao OM+g== X-Gm-Message-State: AOJu0YxE2wagfCMzNcO0HRZ2sY260w1AGdD70Gd5sDnwBODw+Rku8TT9 6HI9QL2W/qZtga7gctAOpvv5MSo9TonvJ6xdOyVGKO1mZUpLu/P5pdXNsmSytjkM/9HTiw== X-Google-Smtp-Source: AGHT+IFwhKYzBpNi2YE4PRKeSOzLm+jjRSZJxfIsQP2aLt1c19XKh2lrrRVvRcdv+mI23HTHM9bSq9gI X-Received: from palermo.c.googlers.com ([fda3:e722:ac3:cc00:7b:198d:ac11:8138]) (user=ardb job=sendgmr) by 2002:a25:abcf:0:b0:e28:f19c:fd4 with SMTP id 3f1490d57ef6-e2bb16cd37dmr931276.11.1729238034003; Fri, 18 Oct 2024 00:53:54 -0700 (PDT) Date: Fri, 18 Oct 2024 09:53:48 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 X-Developer-Signature: v=1; a=openpgp-sha256; l=1847; i=ardb@kernel.org; h=from:subject; bh=FYOaF0aLEwhF6mjikhwenNhSc8+8y/Xk24OlbqUyWJA=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIV1IhEfo2T2/XVWmCy5NjfBtzD+meLuqQMG3YY24qu+iC 5N4Vwh3lLIwiHEwyIopsgjM/vtu5+mJUrXOs2Rh5rAygQxh4OIUgIlIvGP4px4zu8T/NmPiyYv3 OPXU6ma+Vb7m5TBNQVpQ5XDUZ90pJxkZvnarL4uyqp48Zdb6oHYtx96DIuolnM9OcuTdnrl2mXk xPwA= X-Mailer: git-send-email 2.47.0.rc1.288.g06298d1525-goog Message-ID: <20241018075347.2821102-5-ardb+git@google.com> Subject: [PATCH v4 0/3] arm64: Speed up CRC-32 using PMULL instructions From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, herbert@gondor.apana.org.au, will@kernel.org, catalin.marinas@arm.com, Ard Biesheuvel , Eric Biggers , Kees Cook Content-Type: text/plain; charset="UTF-8" From: Ard Biesheuvel The CRC-32 code is library code, and is not part of the crypto subsystem. This means that callers may not generally be aware of the kind of implementation that backs it, and so we've refrained from using FP/SIMD code in the past, as it disables preemption, and this may incur scheduling latencies that the caller did not anticipate. This was solved a while ago, and on arm64, kernel mode FP/SIMD no longer disables preemption. This means we can happily use PMULL instructions in the CRC-32 library code, which permits an optimization to be implemented that results in a speedup of 2 - 2.8x for inputs >1k in size (on Apple M2) Patch #1 implements some prepwork to handle the scalar CRC-32 alternatives patching in C code. Changes since v3: - fix broken crc32be version - add patch to tidy up existing code for reuse - add 4-way code to existing .S file Changes since v2: - drop alternatives.h #include (#1) - drop unneeded branch (#2) - fix comment max -> min (#2) - add Eric's Rb Changes since v1: - rename crc32-pmull.S to crc32-4way.S and avoid pmull in the function names to avoid confusion about the nature of the implementation; - polish the asm a bit, and add some comments - don't return via the scalar code if len dropped to 0 after calling the 4-way code. Cc: Eric Biggers Cc: Kees Cook Ard Biesheuvel (3): arm64/lib: Handle CRC-32 alternative in C code arm64/crc32: Reorganize bit/byte ordering macros arm64/crc32: Implement 4-way interleave using PMULL arch/arm64/lib/Makefile | 2 +- arch/arm64/lib/crc32-glue.c | 82 +++++ arch/arm64/lib/crc32.S | 344 ++++++++++++++++---- 3 files changed, 356 insertions(+), 72 deletions(-) create mode 100644 arch/arm64/lib/crc32-glue.c -- 2.47.0.rc1.288.g06298d1525-goog