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 D3261225A5B; Fri, 22 Aug 2025 15:31:11 +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=1755876673; cv=none; b=goEUFPjq227wDToVh18g5yn6pIwruM0O85vsMiBf2rHrSmipSYdoYfB6cMuM6YkPALi2KQK/2E0b22d+wP0Ij9hf5+fdjQUoABtFz6gMultUV535FS930G/Yw1pXuUjNrRUjXaUGh9KVIIAwkfYzyiU9rlI3wYLrI43CED0rrfQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755876673; c=relaxed/simple; bh=9QqXXJStw71ZU66vliOsj/UdHd+j+97HYjUzko96Bhw=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=HsTWau6uvV86CwvdThdw2i7Ta6XD7M3YFCNvevNGpozf0AzBm8dY7xBkNY+J4hBsu35isiyAWUlW1Xmy4GpL2sjSJMJQVMxgRB0F1Av4rAaa0Rm6AIHbDxo8nM4UI0W3kZZPWtFl43D6ynqN0gjinUWFixAkL0CmqUOgGLeOxdQ= 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 A680827DC; Fri, 22 Aug 2025 08:31:02 -0700 (PDT) Received: from merodach.members.linode.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 970AB3F63F; Fri, 22 Aug 2025 08:31:05 -0700 (PDT) From: James Morse To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org Cc: James Morse , shameerali.kolothum.thodi@huawei.com, 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 , Rex Nie , 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 , Krzysztof Kozlowski , Conor Dooley , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich Subject: [PATCH 01/33] cacheinfo: Expose the code to generate a cache-id from a device_node Date: Fri, 22 Aug 2025 15:29:42 +0000 Message-Id: <20250822153048.2287-2-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250822153048.2287-1-james.morse@arm.com> References: <20250822153048.2287-1-james.morse@arm.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The MPAM driver identifies caches by id for use with resctrl. It needs to know the cache-id when probe-ing, but the value isn't set in cacheinfo until device_initcall(). Expose the code that generates the cache-id. The parts of the MPAM driver that run early can use this to set up the resctrl structures before cacheinfo is ready in device_initcall(). Signed-off-by: James Morse --- Changes since v1: * Renamed cache_of_get_id() cache_of_calculate_id(). --- drivers/base/cacheinfo.c | 19 +++++++++++++------ include/linux/cacheinfo.h | 1 + 2 files changed, 14 insertions(+), 6 deletions(-) diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c index 613410705a47..f6289d142ba9 100644 --- a/drivers/base/cacheinfo.c +++ b/drivers/base/cacheinfo.c @@ -207,11 +207,10 @@ static bool match_cache_node(struct device_node *cpu, #define arch_compact_of_hwid(_x) (_x) #endif -static void cache_of_set_id(struct cacheinfo *this_leaf, - struct device_node *cache_node) +unsigned long cache_of_calculate_id(struct device_node *cache_node) { struct device_node *cpu; - u32 min_id = ~0; + unsigned long min_id = ~0UL; for_each_of_cpu_node(cpu) { u64 id = of_get_cpu_hwid(cpu, 0); @@ -219,15 +218,23 @@ static void cache_of_set_id(struct cacheinfo *this_leaf, id = arch_compact_of_hwid(id); if (FIELD_GET(GENMASK_ULL(63, 32), id)) { of_node_put(cpu); - return; + return ~0UL; } if (match_cache_node(cpu, cache_node)) min_id = min(min_id, id); } - if (min_id != ~0) { - this_leaf->id = min_id; + return min_id; +} + +static void cache_of_set_id(struct cacheinfo *this_leaf, + struct device_node *cache_node) +{ + unsigned long id = cache_of_calculate_id(cache_node); + + if (id != ~0UL) { + this_leaf->id = id; this_leaf->attributes |= CACHE_ID; } } diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h index c8f4f0a0b874..2dcbb69139e9 100644 --- a/include/linux/cacheinfo.h +++ b/include/linux/cacheinfo.h @@ -112,6 +112,7 @@ int acpi_get_cache_info(unsigned int cpu, #endif const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf); +unsigned long cache_of_calculate_id(struct device_node *np); /* * Get the cacheinfo structure for the cache associated with @cpu at -- 2.20.1