From patchwork Sat Jun 22 02:55:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: yunhui cui X-Patchwork-Id: 13708185 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DB05CC27C4F for ; Sat, 22 Jun 2024 02:55:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=7VJj4SeZkLDvQURXcsDYvSn7uP8jOAEdJuuF1ug0vBY=; b=wrc409yO7TW6mX k/c1zfk1vA6mws+VgwH+LtCDbmQ08fj3JOARGaD2xsWbjx81KPdjSyxdzTRqmaf3tVcIdLVNj/EkD BFqiIoBHgMrjl5bvKOMs2KwpKYUuLGgula8U+5i+GrSOx1Sgo4unkU5LgbpR4CFAkBeyyfZr9uegW 5cny7iEeO8Y/NvAl/xymPv+ttjrTI3ltRvezxboYEPKx/8xdMevyvjJh1TuiKpHeSU3Kz1OUvYrwb LugV1mNu/WF/090DEoCnKtVdQCqtKCqXd8pbj836EASZXlQVBFXeGFreePEKSC6sI9U91OkIkH5JW O/oY/Nlq0kHiYK3F5b2Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sKquj-0000000BEaX-2wFE; Sat, 22 Jun 2024 02:55:41 +0000 Received: from mail-il1-x12e.google.com ([2607:f8b0:4864:20::12e]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sKqug-0000000BEZO-03Iy for linux-riscv@lists.infradead.org; Sat, 22 Jun 2024 02:55:40 +0000 Received: by mail-il1-x12e.google.com with SMTP id e9e14a558f8ab-36dd56cf5f5so9426215ab.3 for ; Fri, 21 Jun 2024 19:55:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1719024935; x=1719629735; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=5if2KmJRWjBL76ROZgI/17GyYKcY5wCvGdrrlEk4u0Q=; b=XsoxBW011gMGFGrI/GRiJKefhYhWV7RYmnWDw8k+/PYj3bLskApZFeobqs/Ak+CihJ xb8YPQTr/x2pPJhhFR3tlUQ2Ewx9eVDRe+h0Jx1HsxWEGspbvt871FH4au153GZJCb0U r5R89axVMcWO00za4f3HpBrrBMFnJIBF7Mqb6B8v2EHlhMrIet7bldFXzxmZ2LW6WKrJ tdj3AY0bYVr6qtpbAsrMFa9FjNBLsLfOtJqol1nyivPxQfFtFu47SBz2uJj6l8Lqe05I IXVxTX0HSfGb032DNd9hDWmhh2CoKKK6ZuAa/0D8SvB7RUr+6uQ5ynbvQn6zVAn0J1ka cEKw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719024935; x=1719629735; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=5if2KmJRWjBL76ROZgI/17GyYKcY5wCvGdrrlEk4u0Q=; b=iIB/zCHL8269G0s8G/m1N0FJuv6WW6AvJDHWWaIXlpfMHsbwUUYUmkL69F1YPvDgH7 EOPNVgrM+FeV0cdu0Nr6YWZwyx1bdkxGnjKqUmrGL9z7ttI4xj3Eikkby0m2yesY0X/X X6nyfwbyygT3HC1fmma9VprrAJqdMw0cDZrom4hStamLb15MJnguhdB/yrhors8v4DUf vS1IGkldfl05qP6MgsT3djBGocd7THR7uQA18yt6l7wjocLIKGjoqcMOFkYW2rhPJ/PF CBjKL9CaNiyCLDFy78LmXZcx7XzNpuWhnT5G0NS+RChAfVmtF9icsngJl1nvFgXc21fC wJSQ== X-Forwarded-Encrypted: i=1; AJvYcCXQm5oPHXtchM/YI75qUqP+AfHr894o1c13ocaBe2hplwe82LSwFY2lt7Fewne60vEbg7DxulacM24n5vahmOKRYnsT6y4Ddckd6LgZtTn7 X-Gm-Message-State: AOJu0Yya9QVJfS6AZ8usKcM75+oApDMCfFsVR0bCC72ho2OJfKlhCFQI ui4NUc7i6nbuNtjTiUKOMqdDqMAHOu4nbmdV+HMK4mwuuoi37ospyQQ8sCxyBuk= X-Google-Smtp-Source: AGHT+IEDqRRjk5TKBUDCMz6j3upGcBor/M5o4HP05d0yYUEeFU9td2Hhs5KyDe0neUdvKGxG88q+Sg== X-Received: by 2002:a05:6e02:1808:b0:375:8a71:4cbf with SMTP id e9e14a558f8ab-3761d708893mr106035865ab.23.1719024935423; Fri, 21 Jun 2024 19:55:35 -0700 (PDT) Received: from L6YN4KR4K9.bytedance.net ([139.177.225.253]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-716ba7a0699sm1776286a12.67.2024.06.21.19.55.30 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 21 Jun 2024 19:55:35 -0700 (PDT) From: Yunhui Cui To: jesse@rivosinc.com, jrtc27@jrtc27.com, corbet@lwn.net, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, cleger@rivosinc.com, evan@rivosinc.com, conor.dooley@microchip.com, cuiyunhui@bytedance.com, costa.shul@redhat.com, andy.chiu@sifive.com, samitolvanen@google.com, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Palmer Dabbelt , Anup Patel Subject: [PATCH v3] RISC-V: Provide the frequency of time CSR via hwprobe Date: Sat, 22 Jun 2024 10:55:14 +0800 Message-Id: <20240622025514.66537-1-cuiyunhui@bytedance.com> X-Mailer: git-send-email 2.39.2 (Apple Git-143) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240621_195538_363092_39A236E8 X-CRM114-Status: GOOD ( 11.86 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Palmer Dabbelt A handful of user-visible behavior is based on the frequency of the time CSR. Signed-off-by: Palmer Dabbelt Signed-off-by: Yunhui Cui Reviewed-by: Evan Green Reviewed-by: Anup Patel Acked-by: Punit Agrawal --- Documentation/arch/riscv/hwprobe.rst | 2 ++ arch/riscv/include/asm/hwprobe.h | 2 +- arch/riscv/include/uapi/asm/hwprobe.h | 1 + arch/riscv/kernel/sys_hwprobe.c | 5 +++++ 4 files changed, 9 insertions(+), 1 deletion(-) diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst index df5045103e73..ec3c99474ed7 100644 --- a/Documentation/arch/riscv/hwprobe.rst +++ b/Documentation/arch/riscv/hwprobe.rst @@ -233,3 +233,5 @@ The following keys are defined: * :c:macro:`RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE`: An unsigned int which represents the size of the Zicboz block in bytes. + +* :c:macro:`RISCV_HWPROBE_KEY_TIME_CSR_FREQ`: Frequency (in Hz) of `time CSR`. diff --git a/arch/riscv/include/asm/hwprobe.h b/arch/riscv/include/asm/hwprobe.h index 150a9877b0af..ef01c182af2b 100644 --- a/arch/riscv/include/asm/hwprobe.h +++ b/arch/riscv/include/asm/hwprobe.h @@ -8,7 +8,7 @@ #include -#define RISCV_HWPROBE_MAX_KEY 7 +#define RISCV_HWPROBE_MAX_KEY 8 static inline bool riscv_hwprobe_key_is_valid(__s64 key) { diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h index 2fb8a8185e7a..5053a9b18710 100644 --- a/arch/riscv/include/uapi/asm/hwprobe.h +++ b/arch/riscv/include/uapi/asm/hwprobe.h @@ -74,6 +74,7 @@ struct riscv_hwprobe { #define RISCV_HWPROBE_MISALIGNED_MASK (7 << 0) #define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6 #define RISCV_HWPROBE_KEY_MISALIGNED_PERF 7 +#define RISCV_HWPROBE_KEY_TIME_CSR_FREQ 8 /* Increase RISCV_HWPROBE_MAX_KEY when adding items. */ /* Flags */ diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c index e4ec9166339f..3d47edc04a3f 100644 --- a/arch/riscv/kernel/sys_hwprobe.c +++ b/arch/riscv/kernel/sys_hwprobe.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include #include @@ -227,6 +228,10 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair, pair->value = riscv_cboz_block_size; break; + case RISCV_HWPROBE_KEY_TIME_CSR_FREQ: + pair->value = riscv_timebase; + break; + /* * For forward compatibility, unknown keys don't fail the whole * call, but get their element key set to -1 and value set to 0