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[139.178.88.99]) by mx.google.com with ESMTPS id jg2-20020a17090326c200b001d3f68db02asi3783156plb.120.2024.01.10.06.57.31 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Jan 2024 06:57:31 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel+bounces-22385-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20230601 header.b=KNDs6P6r; spf=pass (google.com: domain of linux-kernel+bounces-22385-ouuuleilei=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) smtp.mailfrom="linux-kernel+bounces-22385-ouuuleilei=gmail.com@vger.kernel.org"; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com 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 67BF8286884 for ; Wed, 10 Jan 2024 14:57:31 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 101E54CDFD; Wed, 10 Jan 2024 14:56:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="KNDs6P6r" Received: from mail-ej1-f45.google.com (mail-ej1-f45.google.com [209.85.218.45]) (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 C81994CB27; Wed, 10 Jan 2024 14:56:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-ej1-f45.google.com with SMTP id a640c23a62f3a-a28b2e1a13fso444335066b.3; Wed, 10 Jan 2024 06:56:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1704898569; x=1705503369; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=cEsiVEXZ3aHRFWQgBMV3CYshoa+SSWa26OTBHMwiUvc=; b=KNDs6P6rM02RykLozrGoI+FROJqXg73tnkaaBgchryrp6UH2k94Pj/+xViw0WhXcA/ SiB6NBX5EmJ3wLsytBsgjp4nc2uAPXX11EUlDz8jf+Rqr/ux+clGQvr7qvdQqnmvjveS eM3EDlbafQJGhsNeyHv4ljhyL/g7VIA0w4teRIUIUunnqOG7W5s3miJW9n5Q9fPeWRnI 0Y3dez+VPvb+zWP/webpjmkb38cntkRj6lEucEDb6FYO8fyCEXXxsjv0wqES95bJs+eD pIADt1R4aBxNBvt7mhimGay3+w3xTpO/0QCnRkMFlmYvuUc5ZXhWKxIrBdViXYNyfEdQ XaYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1704898569; x=1705503369; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=cEsiVEXZ3aHRFWQgBMV3CYshoa+SSWa26OTBHMwiUvc=; b=rHduOY+RzvWYGphgK7LEThdZFWDXPLBEGGLcf1wmQy2Ty7SFg/DOs426fFD0gDQfbB hCzwlnHsHulAQxkfAcm0s/g7aHbc/QxJU7WfYHzrjFxifPDpGAGjLIJISy35c2FaXrVh kJxaiYkc5zb16bOVBcV0uBE1JNQy1RkKP9fTYfiZTOjnzo3QUs2fvTo1ON/QpyoKEbtJ rFx5bfW/n1qHJD34YXqUptraNXztv9jX9OUFAZ7gtAxngGIgYBtX+zST4QUrNmdYVsaM R9XMqxIRhfQ0L5bbiQITIzhrmHGyoyYYElnvgF7P2IklgiOuurL2jUtv0Tp5fKpeohml Ltiw== X-Gm-Message-State: AOJu0Yy9uBQ9Q6cC/Mb1DEVjrMzr2+AuUpbxvaAxH2qliFs5F78iCkOm pKW9t15OrqLaU+TQFoi3icA= X-Received: by 2002:a17:906:168d:b0:a2b:61dd:1687 with SMTP id s13-20020a170906168d00b00a2b61dd1687mr665162ejd.116.1704898569033; Wed, 10 Jan 2024 06:56:09 -0800 (PST) Received: from andrea.wind3.hub ([31.189.29.12]) by smtp.gmail.com with ESMTPSA id bm3-20020a170906c04300b00a2a4efe7d3dsm2161032ejb.79.2024.01.10.06.56.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Jan 2024 06:56:08 -0800 (PST) From: Andrea Parri To: paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, mathieu.desnoyers@efficios.com, paulmck@kernel.org, corbet@lwn.net Cc: mmaas@google.com, hboehm@google.com, striker@us.ibm.com, charlie@rivosinc.com, rehn@rivosinc.com, linux-riscv@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Andrea Parri Subject: [PATCH v3 3/4] locking: Introduce prepare_sync_core_cmd() Date: Wed, 10 Jan 2024 15:55:32 +0100 Message-Id: <20240110145533.60234-4-parri.andrea@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240110145533.60234-1-parri.andrea@gmail.com> References: <20240110145533.60234-1-parri.andrea@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1787715808822449577 X-GMAIL-MSGID: 1787715808822449577 Introduce an architecture function that architectures can use to set up ("prepare") SYNC_CORE commands. The function will be used by RISC-V to update its "deferred icache- flush" data structures (icache_stale_mask). Architectures defining prepare_sync_core_cmd() static inline need to select ARCH_HAS_PREPARE_SYNC_CORE_CMD. Suggested-by: Mathieu Desnoyers Signed-off-by: Andrea Parri Reviewed-by: Mathieu Desnoyers --- include/linux/sync_core.h | 16 +++++++++++++++- init/Kconfig | 3 +++ kernel/sched/membarrier.c | 1 + 3 files changed, 19 insertions(+), 1 deletion(-) diff --git a/include/linux/sync_core.h b/include/linux/sync_core.h index 013da4b8b3272..67bb9794b8758 100644 --- a/include/linux/sync_core.h +++ b/include/linux/sync_core.h @@ -17,5 +17,19 @@ static inline void sync_core_before_usermode(void) } #endif -#endif /* _LINUX_SYNC_CORE_H */ +#ifdef CONFIG_ARCH_HAS_PREPARE_SYNC_CORE_CMD +#include +#else +/* + * This is a dummy prepare_sync_core_cmd() implementation that can be used on + * all architectures which provide unconditional core serializing instructions + * in switch_mm(). + * If your architecture doesn't provide such core serializing instructions in + * switch_mm(), you may need to write your own functions. + */ +static inline void prepare_sync_core_cmd(struct mm_struct *mm) +{ +} +#endif +#endif /* _LINUX_SYNC_CORE_H */ diff --git a/init/Kconfig b/init/Kconfig index 9ffb103fc927b..87daf50838f02 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1972,6 +1972,9 @@ source "kernel/Kconfig.locks" config ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE bool +config ARCH_HAS_PREPARE_SYNC_CORE_CMD + bool + config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE bool diff --git a/kernel/sched/membarrier.c b/kernel/sched/membarrier.c index f3d91628d6b8a..6d1f31b3a967b 100644 --- a/kernel/sched/membarrier.c +++ b/kernel/sched/membarrier.c @@ -320,6 +320,7 @@ static int membarrier_private_expedited(int flags, int cpu_id) MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE_READY)) return -EPERM; ipi_func = ipi_sync_core; + prepare_sync_core_cmd(mm); } else if (flags == MEMBARRIER_FLAG_RSEQ) { if (!IS_ENABLED(CONFIG_RSEQ)) return -EINVAL;