From patchwork Thu Dec 16 23:31:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring \(Arm\)" X-Patchwork-Id: 525277 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46C8DC43219 for ; Thu, 16 Dec 2021 23:31:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229707AbhLPXbj (ORCPT ); Thu, 16 Dec 2021 18:31:39 -0500 Received: from mail-oi1-f173.google.com ([209.85.167.173]:39475 "EHLO mail-oi1-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229648AbhLPXbf (ORCPT ); Thu, 16 Dec 2021 18:31:35 -0500 Received: by mail-oi1-f173.google.com with SMTP id bf8so1148882oib.6; Thu, 16 Dec 2021 15:31:35 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=tg2oCBFq5G88h+ck8cHgDUdDvDFgPbXH7dXGlomqHsQ=; b=bkhaFBoUjW+8we8ZsYlDsX9gi1mQkHAWGeCvgCRRHoG0vWA77O0iVpAXp7tG+fVljM VLgxMbNxcQJ8AmhbkHSiTxXNxE+Y+NSYjZ1956QtSIvRMj8KPLCGQ6Xsyc3+tmpZbu0a II/Rj4OztF9aEqwb1S2PnSqK3+yNdKUNTJymnB6mRsXwbH6dWFInaXJouiQI6sKRgwAl QLIJVH2lgjWPfg+J/oKQ/jRuUZlvYgcXnfTRdkMwYQj44yMkASlNtFm/2f2DcJftMB1k ArzADVKScZYfRiw21TgWqOMmdS3Ux/xHLp7GQ1c5psj1EVoMcPbbVJCtIKdfdlQk44DJ VXvA== X-Gm-Message-State: AOAM533goHL6HKh7X2a1HiP2nTC3W27L2XHCRvYLRI7sBGGna6X/pgfq +hIvrSFNGnMfwOSYBdMWououJ6kU0Q== X-Google-Smtp-Source: ABdhPJzvFgF0rdegvhuQuQN0VTaHMD+mkgyRbm/qcieGt8GT8s/5GRC4K1MdoZJ+46/yeYCuwAF3Yw== X-Received: by 2002:a05:6808:218b:: with SMTP id be11mr169423oib.80.1639697494978; Thu, 16 Dec 2021 15:31:34 -0800 (PST) Received: from xps15.herring.priv (66-90-148-213.dyn.grandenetworks.net. [66.90.148.213]) by smtp.googlemail.com with ESMTPSA id n11sm1256646oor.9.2021.12.16.15.31.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Dec 2021 15:31:34 -0800 (PST) From: Rob Herring To: Greg Kroah-Hartman , James Morse , Jeremy Linton Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Sudeep Holla , "Rafael J. Wysocki" , Len Brown , devicetree@vger.kernel.org, linux-acpi@vger.kernel.org Subject: [PATCH 6/6] cacheinfo: Add cacheinfo_get_cache_affinity() function Date: Thu, 16 Dec 2021 17:31:25 -0600 Message-Id: <20211216233125.1130793-7-robh@kernel.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211216233125.1130793-1-robh@kernel.org> References: <20211216233125.1130793-1-robh@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add a cacheinfo_get_cache_affinity() function to retrieve the CPU affinity mask for a given cache identified by level and cache id. This is needed by Arm MPAM to get the CPU affinity of MPAM enabled caches. Cc: Greg Kroah-Hartman Cc: "Rafael J. Wysocki" Signed-off-by: Rob Herring --- include/linux/cacheinfo.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h index 37652cfdd8dc..5e72420cdc75 100644 --- a/include/linux/cacheinfo.h +++ b/include/linux/cacheinfo.h @@ -123,4 +123,28 @@ static inline int get_cpu_cacheinfo_id(int cpu, int level) return -1; } +/* + * Get the CPU affinity of the cache associated with @cpu at level @level and + * with identifier @id. + * cpuhp lock must be held. + */ +static inline int cacheinfo_get_cache_affinity(int cpu, int level, int id, + cpumask_t *mask) +{ + struct cpu_cacheinfo *ci = get_cpu_cacheinfo(cpu); + int i; + + for (i = 0; ci->info_list && i < ci->num_leaves; i++) { + if ((ci->info_list[i].level == level) && + (ci->info_list[i].attributes & CACHE_ID) && + (ci->info_list[i].id == id)) { + cpumask_copy(mask, &ci->info_list[i].cpu_affinity_map); + return 0; + } + } + + return -EINVAL; +} + + #endif /* _LINUX_CACHEINFO_H */