Message ID | 20240124-fencei-v10-0-a25971f4301d@rivosinc.com |
---|---|
Headers |
Return-Path: <linux-kernel+bounces-37941-ouuuleilei=gmail.com@vger.kernel.org> Delivered-To: ouuuleilei@gmail.com Received: by 2002:a05:7300:2553:b0:103:945f:af90 with SMTP id p19csp1414602dyi; Wed, 24 Jan 2024 20:23:40 -0800 (PST) X-Google-Smtp-Source: AGHT+IHIGNk8v8TrSp0wXIFlMZ57UmJ7QtfMKbqPZLkGXlSrYaONzXHQpQchIwVMmgqNOqWZLQ8X X-Received: by 2002:a17:90a:ca89:b0:28e:7bc0:31cb with SMTP id y9-20020a17090aca8900b0028e7bc031cbmr442033pjt.24.1706156620107; Wed, 24 Jan 2024 20:23:40 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1706156620; cv=pass; d=google.com; s=arc-20160816; b=x2WJTxgFJLlJCqVVbypuNEqgYWESTcwu415PGfF1BPqEVvStWfzlwb7+6RbCXyeuKL q2/Cweofxgz5BmUnIcwXmvXE1iXkEpdLApMcEDz++S58j3Sq5ssPPJ6CDBRk3kl1LGnn yTjw5IvCRNs3l62EbzOMMSQAZq/7UM+06xAdTnGHe3ue8ct/PWwLbqECn4foKG0dn3nF lWrcFhKQF3leXGxnKJx717Y+xfSOO+wnH6c5FUfNseTgo9f1rh99U4lPHDkCof2N/iOa 5jLxMfvDHqRdEBWSbHgXJMa1I35x2B/+NLdolEc4ERH7i5c/bMnPXAKBipQ1LrguQ1mh vABA== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=cc:to:content-transfer-encoding:mime-version:list-unsubscribe :list-subscribe:list-id:precedence:message-id:date:subject:from :dkim-signature; bh=bdsnxFeLDc7O+tsMX6XHeSkZFgA7YsQDvmpx17WI4kI=; fh=/XXWyXb92ihsaKNKqSDb4nUFODn0XZjcGSlWepA+YcI=; b=lAi5apo4EBfZsgR+xeeLdQElmdxUs4M9yJN2GggIJRIOWOfs6FFY88EivXNP2Hc6MI /+TTlopP6Bgjye2OY6WCqnAilohSq+m3eTefzKyqQPV/mVo7PC+wpSWWr6vdq75MP8c7 srrz9lsV+hoadoPefXAbq8C/evcZctIGooLI1YzlczYbiIpUy0a4dDH4lR7mBUll8Kba 5KtdESgIPJxOPjnRGd1x3ljK/vp5cIf5PQyY9mMi44iE2qZVUJdbUc4VQ4N7sE6a+sqW 4zk3ty7xQ2X00/VynRw6SOjUXCAmDB0sKLahja1JVB/cwxDurCGtA6YjH4l8A5g0zIG9 ppgA== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@rivosinc-com.20230601.gappssmtp.com header.s=20230601 header.b=ImPK+B3u; arc=pass (i=1 spf=pass spfdomain=rivosinc.com dkim=pass dkdomain=rivosinc-com.20230601.gappssmtp.com); spf=pass (google.com: domain of linux-kernel+bounces-37941-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-37941-ouuuleilei=gmail.com@vger.kernel.org" Received: from sv.mirrors.kernel.org (sv.mirrors.kernel.org. [2604:1380:45e3:2400::1]) by mx.google.com with ESMTPS id o15-20020a17090ad24f00b00290430ac91csi642337pjw.121.2024.01.24.20.23.39 for <ouuuleilei@gmail.com> (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Jan 2024 20:23:40 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-37941-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) client-ip=2604:1380:45e3:2400::1; Authentication-Results: mx.google.com; dkim=pass header.i=@rivosinc-com.20230601.gappssmtp.com header.s=20230601 header.b=ImPK+B3u; arc=pass (i=1 spf=pass spfdomain=rivosinc.com dkim=pass dkdomain=rivosinc-com.20230601.gappssmtp.com); spf=pass (google.com: domain of linux-kernel+bounces-37941-ouuuleilei=gmail.com@vger.kernel.org designates 2604:1380:45e3:2400::1 as permitted sender) smtp.mailfrom="linux-kernel+bounces-37941-ouuuleilei=gmail.com@vger.kernel.org" Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sv.mirrors.kernel.org (Postfix) with ESMTPS id D2418287BA5 for <ouuuleilei@gmail.com>; Thu, 25 Jan 2024 04:23:39 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id BEEA510A2E; Thu, 25 Jan 2024 04:23:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="ImPK+B3u" Received: from mail-pg1-f181.google.com (mail-pg1-f181.google.com [209.85.215.181]) (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 CD7F5101D4 for <linux-kernel@vger.kernel.org>; Thu, 25 Jan 2024 04:23:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706156592; cv=none; b=lhwkv4NqEyUCHfB6nOUNgJSmuFseu1uJjt+CAqavTrCmi6tvId+2RLOuQaNNmVvQfJzs9VXCtWLdprf6z7h1TSUwW4FMQSQkfCkSz993hYVeV0nviiX6+/4TQ/p9q1kHNx5lW7IOeY2+rkTQk0KpSBa+/GVgAdVW33y5vw/fkQc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706156592; c=relaxed/simple; bh=Fp/Nsdcth0hMGV4QFLJyIHW6clYIcFNJ6WEMI/uUbQg=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=vGOMCUfqL8uUCwpmGfM/FTFUUWexdiGmJF5woaefrsuxWaUuU1it2CCmQeUUaV17cBUs0jZwk3o2+M2BuBS0+Dt+6jnLW3MZQOPsUmeD2ZOKrcJ75bT0l3GlWZzzivlIDaB4BtnFwxveKdixrEyPcJG78qivH6lhX3eYjJIfC+I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=ImPK+B3u; arc=none smtp.client-ip=209.85.215.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Received: by mail-pg1-f181.google.com with SMTP id 41be03b00d2f7-5ce74ea4bf2so251397a12.0 for <linux-kernel@vger.kernel.org>; Wed, 24 Jan 2024 20:23:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1706156590; x=1706761390; darn=vger.kernel.org; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:from:to:cc:subject:date:message-id:reply-to; bh=bdsnxFeLDc7O+tsMX6XHeSkZFgA7YsQDvmpx17WI4kI=; b=ImPK+B3uSnxBQUMF7empJ4iH42WReotTS9BJDTwMI2S67bMKnT2q3FhvrLzYoe4T3b wYi7HUSJCtQ7f7/N/Oq2t3Sj3MdD9XixxtQ8k8AKZVSUmRBjT8Dzeu1Ey01nw9GZGQAk hOC5+oYTERUnQokqGW1qTSr/ltbYMpIdfL/4QzFp2Exvvf8NASjp1aXHd4Tutb7fFZ/o 1W8Dsp2C91SmY5ADED1AMfxeselJUoC1yoQwQWo/wn/RNRBejndaLo7CAJWfxt4mGU3P SFa67xr5LIj2+7ozMEF2UCvyEhVvqCPxaWXeLluUt9fOxRuDqauxjVeGrzHsiOEsqrkj 3Yqw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1706156590; x=1706761390; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=bdsnxFeLDc7O+tsMX6XHeSkZFgA7YsQDvmpx17WI4kI=; b=U1Zi6dcaUZV+yBp/fHPkrIXVyzioiW3wP8EFKcKkUsJwB+p/5uuNrOlXhcNC4CwCT4 FD9MMPdtNIVxdRra8Z0NBAdXg4bGroaIuwkADgwzSq6XIBHtTyb6XY4Hx88wruTfWKOC HnTAMFmaUZbWV5yEw1l1FBcydkYa4hBpcRmWK/RTD2vOQ64RFNglJ/pMjWtgV1A18n3q DNjtTRlVsnsKWhswGYAKZU98mu+MJbZ8mc+GwPzsyup9/LBIF4vaJbVA+83n2kjr3ghq hhiaEtX2JP8YfBVKeOZmK5TrvrPVVg6ueaaK9gB8UBk3Q0lp4o+qwGoB+ni9VVRf2Meo UHOw== X-Gm-Message-State: AOJu0YxifQjkSGwIy6E5VBJQU5CXVrNk3q27kcZfof3FeQ5J6UJyRvZQ 8AdbbUQ5Hb2ZVCL3dXnFhxGBYR1SyDV17ZhcGcPMj0B+f9LZyUHW2U7gMtOWHx8= X-Received: by 2002:a05:6a20:9f03:b0:19a:fbfa:b16a with SMTP id mk3-20020a056a209f0300b0019afbfab16amr468801pzb.30.1706156590009; Wed, 24 Jan 2024 20:23:10 -0800 (PST) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id ko9-20020a056a00460900b006dab36287bfsm14549743pfb.207.2024.01.24.20.23.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Jan 2024 20:23:09 -0800 (PST) From: Charlie Jenkins <charlie@rivosinc.com> Subject: [PATCH v10 0/2] riscv: Create and document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl Date: Wed, 24 Jan 2024 20:23:07 -0800 Message-Id: <20240124-fencei-v10-0-a25971f4301d@rivosinc.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: <linux-kernel.vger.kernel.org> List-Subscribe: <mailto:linux-kernel+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:linux-kernel+unsubscribe@vger.kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-B4-Tracking: v=1; b=H4sIACvisWUC/23QS07EMAwG4KuMsqbIdp5lxT0Qi+bFZEE7alEEG vXuuCOmU6EsbeX77fgqljSXtIiX01XMqZalTCMXCE8nEc7D+JG6ErkhCEgiou1yGkMqXe6zgWi dygMIfnyZUy7ft6S3d67PZfma5p9bcMWt+xdBdI+o2EHnUwCHGDwhvc6lTksZw3OYPsWWUukgJ eySWFLwhuTg0WNuSPmQhHKXcptpNWpH0iVvG1LdpQKE/cNVsYwqZMq+Bx1lQ+qjdLvULIcBk8Z oiai1rTnKfpeGJShEw1YpHRrSHiQ+bmtZWpfBoEoYPTSkO0qzS8dSyUHx1VQGwobsD5Iet+23m cjr+pxctP/luq6/EfVc/3ACAAA= To: Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Jonathan Corbet <corbet@lwn.net>, Conor Dooley <conor.dooley@microchip.com>, =?utf-8?b?Q2zDqW1lbnQgTMOpZ2Vy?= <cleger@rivosinc.com>, Atish Patra <atishp@atishpatra.org>, Randy Dunlap <rdunlap@infradead.org>, Alexandre Ghiti <alex@ghiti.fr> Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Charlie Jenkins <charlie@rivosinc.com>, Atish Patra <atishp@rivosinc.com> X-Mailer: b4 0.12.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1706156588; l=2933; i=charlie@rivosinc.com; s=20231120; h=from:subject:message-id; bh=Fp/Nsdcth0hMGV4QFLJyIHW6clYIcFNJ6WEMI/uUbQg=; b=SvtUbRzRCSPcDsyKUxxcadxQoBxxmIhU4504F5DxcJ1phzCTxqjQPG4L5ty+vMNgQswrEoK5x HlIebRpycAvDGysjIrrNQ3pIhmMKVTQ3CdAEmLCsQkAYHOsQyG0xTtr X-Developer-Key: i=charlie@rivosinc.com; a=ed25519; pk=t4RSWpMV1q5lf/NWIeR9z58bcje60/dbtxxmoSfBEcs= X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789034883900182630 X-GMAIL-MSGID: 1789034883900182630 |
Series |
riscv: Create and document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl
|
|
Message
Charlie Jenkins
Jan. 25, 2024, 4:23 a.m. UTC
Improve the performance of icache flushing by creating a new prctl flag
PR_RISCV_SET_ICACHE_FLUSH_CTX. The interface is left generic to allow
for future expansions such as with the proposed J extension [1].
Documentation is also provided to explain the use case.
Patch sent to add PR_RISCV_SET_ICACHE_FLUSH_CTX to man-pages [2].
[1] https://github.com/riscv/riscv-j-extension
[2] https://lore.kernel.org/linux-man/20240124-fencei_prctl-v1-1-0bddafcef331@rivosinc.com
Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
Changes in v10:
- Fix fence.i condition to properly only flush on migration (Alex)
- Fix documentation wording (Alex)
- Link to v9: https://lore.kernel.org/r/20240123-fencei-v9-0-71411bfe8d71@rivosinc.com
Changes in v9:
- Remove prev_cpu from mm (Alex)
- Link to v8: https://lore.kernel.org/r/20240116-fencei-v8-0-43a42134f021@rivosinc.com
Changes in v8:
- Only flush icache if migrated to different cpu (Alex)
- Move flushing to switch_to to catch per-thread flushing properly
- Link to v7: https://lore.kernel.org/r/20240112-fencei-v7-0-78f0614e1db0@rivosinc.com
Changes in v7:
- Change "per_thread" parameter to "scope" and provide constants for the
parameter.
- Link to v6: https://lore.kernel.org/r/20240109-fencei-v6-0-04116e51445c@rivosinc.com
Changes in v6:
- Fixup documentation formatting
- Link to v5: https://lore.kernel.org/r/20240108-fencei-v5-0-aa1e51d7222f@rivosinc.com
Changes in v5:
- Minor documentation changes (Randy)
- Link to v4: https://lore.kernel.org/r/20240107-fencei-v4-0-d4cf2fb905d3@rivosinc.com
Changes in v4:
- Add OFF flag to disallow fence.i in userspace (Atish)
- Fix documentation issues (Atish)
- Link to v3: https://lore.kernel.org/r/20231213-fencei-v3-0-b75158238eb7@rivosinc.com
Changes in v3:
- Check if value force_icache_flush set on thread, rather than in mm
twice (Clément)
- Link to v2: https://lore.kernel.org/r/20231130-fencei-v2-0-2cb623ab1b1f@rivosinc.com
Changes in v2:
- Fix kernel-doc comment (Conor)
- Link to v1: https://lore.kernel.org/r/20231122-fencei-v1-0-bec0811cb212@rivosinc.com
---
Charlie Jenkins (2):
riscv: Include riscv_set_icache_flush_ctx prctl
documentation: Document PR_RISCV_SET_ICACHE_FLUSH_CTX prctl
Documentation/arch/riscv/cmodx.rst | 96 ++++++++++++++++++++++++++++++++++++++
Documentation/arch/riscv/index.rst | 1 +
arch/riscv/include/asm/mmu.h | 2 +
arch/riscv/include/asm/processor.h | 7 +++
arch/riscv/include/asm/switch_to.h | 13 ++++++
arch/riscv/mm/cacheflush.c | 67 ++++++++++++++++++++++++++
arch/riscv/mm/context.c | 13 ++++--
include/uapi/linux/prctl.h | 6 +++
kernel/sys.c | 6 +++
9 files changed, 208 insertions(+), 3 deletions(-)
---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20231117-fencei-f9f60d784fa0