From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4AE0428373; Fri, 12 Sep 2025 15:09:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757689745; cv=none; b=KoG2FGPh9n4TZ0oK3/gkl4BxI/evb3O28y2Mqu5HzUaxrxFVbs7piA5Vwg1+tYqkMNLo0hL0mdK/Z5E+In9zo3Tx2rEC4XYSAvukhyOAtMbJ5vXLrcGzG6Ht5UbXsNkdmFXHvBNaR6dfCVteOOtfNS48niqR7cfXhXKwsADL3Tw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757689745; c=relaxed/simple; bh=Sf3Dy8uUFZpug9JpadlwWUw65olplxRVsQughTo54IQ=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=IvzJp0R0N7W02M4sl7ghWni91ZKGwSg/iV7/flNiY0GfiDPPgufXZVrqOBJEuxzjOq4ya+V326PsHKiMN2kiYPS4WTq8/HZEYWEE7lb+W6FHR51wmfiKKiByTadnq3c9DW4Cl8/CbjtTsIiCb0yrf+AfRPPE3ktUqHwPdOR1MEo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2B8FD12FC; Fri, 12 Sep 2025 08:08:55 -0700 (PDT) Received: from [10.1.196.46] (e134344.arm.com [10.1.196.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DE3143F694; Fri, 12 Sep 2025 08:08:58 -0700 (PDT) Message-ID: <842edca0-11c7-43ac-ba4b-ab40678034e2@arm.com> Date: Fri, 12 Sep 2025 16:08:57 +0100 Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 23/29] arm_mpam: Add mpam_msmon_read() to read monitor value From: Ben Horgan To: James Morse , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org Cc: D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Dave Martin , Koba Ko , Shanker Donthineni , fenghuay@nvidia.com, baisheng.gao@unisoc.com, Jonathan Cameron , Rob Herring , Rohit Mathew , Rafael Wysocki , Len Brown , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich References: <20250910204309.20751-1-james.morse@arm.com> <20250910204309.20751-24-james.morse@arm.com> <1344b395-66aa-4714-b1fc-9c970c0fd0bf@arm.com> Content-Language: en-US In-Reply-To: <1344b395-66aa-4714-b1fc-9c970c0fd0bf@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi James, On 9/11/25 16:46, Ben Horgan wrote: > Hi James, > > On 9/10/25 21:43, James Morse wrote: >> Reading a monitor involves configuring what you want to monitor, and >> reading the value. Components made up of multiple MSC may need values >> from each MSC. MSCs may take time to configure, returning 'not ready'. >> The maximum 'not ready' time should have been provided by firmware. >> >> Add mpam_msmon_read() to hide all this. If (one of) the MSC returns >> not ready, then wait the full timeout value before trying again. >> >> CC: Shanker Donthineni >> Signed-off-by: James Morse >> --- >> Changes since v1: >> * Added XCL support. >> * Merged FLT/CTL constants. >> * a spelling mistake in a comment. >> * moved structrues around. >> --- >> drivers/resctrl/mpam_devices.c | 226 ++++++++++++++++++++++++++++++++ >> drivers/resctrl/mpam_internal.h | 19 +++ >> 2 files changed, 245 insertions(+) >> >> diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c >> index cf190f896de1..1543c33c5d6a 100644 >> --- a/drivers/resctrl/mpam_devices.c >> +++ b/drivers/resctrl/mpam_devices.c >> + >> +static void gen_msmon_ctl_flt_vals(struct mon_read *m, u32 *ctl_val, >> + u32 *flt_val) >> +{ >> + struct mon_cfg *ctx = m->ctx; >> + >> + /* >> + * For CSU counters its implementation-defined what happens when not >> + * filtering by partid. >> + */ >> + *ctl_val |= MSMON_CFG_x_CTL_MATCH_PARTID; >> + >> + *flt_val = FIELD_PREP(MSMON_CFG_x_FLT_PARTID, ctx->partid); >> + if (m->ctx->match_pmg) { >> + *ctl_val |= MSMON_CFG_x_CTL_MATCH_PMG; >> + *flt_val |= FIELD_PREP(MSMON_CFG_x_FLT_PMG, ctx->pmg); >> + } >> + >> + switch (m->type) { >> + case mpam_feat_msmon_csu: >> + *ctl_val = MSMON_CFG_CSU_CTL_TYPE_CSU; >> + >> + if (mpam_has_feature(mpam_feat_msmon_csu_xcl, &m->ris->props)) >> + *flt_val |= FIELD_PREP(MSMON_CFG_CSU_FLT_XCL, >> + ctx->csu_exclude_clean); >> + >> + break; >> + case mpam_feat_msmon_mbwu: >> + *ctl_val = MSMON_CFG_MBWU_CTL_TYPE_MBWU; As you mentioned offline, this zeroes the other bits in *ctl_val. Thanks, Ben