From patchwork Thu Nov 5 17:42:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 11884851 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 75F4C6A2 for ; Thu, 5 Nov 2020 18:01:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5BF662087D for ; Thu, 5 Nov 2020 18:01:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731591AbgKESBt (ORCPT ); Thu, 5 Nov 2020 13:01:49 -0500 Received: from frasgout.his.huawei.com ([185.176.79.56]:2060 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725862AbgKESBt (ORCPT ); Thu, 5 Nov 2020 13:01:49 -0500 Received: from fraeml708-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4CRrSg73zhz67HHg; Fri, 6 Nov 2020 01:42:27 +0800 (CST) Received: from lhreml715-chm.china.huawei.com (10.201.108.66) by fraeml708-chm.china.huawei.com (10.206.15.36) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Thu, 5 Nov 2020 18:44:02 +0100 Received: from DESKTOP-6T4S3DQ.china.huawei.com (10.47.87.221) by lhreml715-chm.china.huawei.com (10.201.108.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1913.5; Thu, 5 Nov 2020 17:44:01 +0000 From: Shiju Jose To: , , , , , , , , CC: , , Subject: [RFC PATCH 2/4] ACPI: PPTT: Add function acpi_find_cache_info Date: Thu, 5 Nov 2020 17:42:31 +0000 Message-ID: <20201105174233.1146-3-shiju.jose@huawei.com> X-Mailer: git-send-email 2.26.0.windows.1 In-Reply-To: <20201105174233.1146-1-shiju.jose@huawei.com> References: <20201105174233.1146-1-shiju.jose@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.47.87.221] X-ClientProxiedBy: lhreml745-chm.china.huawei.com (10.201.108.195) To lhreml715-chm.china.huawei.com (10.201.108.66) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-edac@vger.kernel.org Add function acpi_find_cache_info() to find the information of the caches found in a CPU hierarchy represented in the PPTT. Co-developed-by: Jonathan Cameron Signed-off-by: Jonathan Cameron Signed-off-by: Shiju Jose --- drivers/acpi/pptt.c | 62 +++++++++++++++++++++++++++++++++++++++ include/linux/cacheinfo.h | 12 ++++++++ 2 files changed, 74 insertions(+) diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c index de1dd605d3ad..5f46e6257e6b 100644 --- a/drivers/acpi/pptt.c +++ b/drivers/acpi/pptt.c @@ -670,6 +670,68 @@ int acpi_find_last_cache_level(unsigned int cpu) return number_of_levels; } +/** + * acpi_find_cache_info() - Find the information of CPU caches + * represented in the PPTT. + * @cpu: Kernel logical CPU number. + * @cacheinfo: array of struct acpi_cacheinfo. + * @size: dimension of the array. + * + * Given a logical CPU number, returns the info of caches + * represented in the PPTT. + * Errors caused by lack of a PPTT table, or otherwise, return 0 + * indicating we didn't find any cache levels. + * + * Return: total number of caches found in the CPU hierarchy or error. + */ +int acpi_find_cache_info(unsigned int cpu, struct acpi_cacheinfo *cacheinfo, + size_t size) +{ + u32 acpi_cpu_id; + acpi_status status; + struct acpi_table_header *table_hdr; + struct acpi_pptt_processor *cpu_node = NULL; + struct acpi_pptt_cache *found_cache; + int i, number_of_caches = 0; + int max_level, level = 1; + enum cache_type type[] = { + CACHE_TYPE_DATA, + CACHE_TYPE_INST, + CACHE_TYPE_UNIFIED, + }; + + if (!cacheinfo || !size) + return -ENOMEM; + + status = acpi_get_table(ACPI_SIG_PPTT, 0, &table_hdr); + if (ACPI_FAILURE(status)) { + acpi_pptt_warn_missing(); + return -ENOENT; + } + + acpi_cpu_id = get_acpi_id_for_cpu(cpu); + max_level = acpi_find_cache_levels(table_hdr, acpi_cpu_id); + while (level <= max_level) { + for (i = 0; i < ARRAY_SIZE(type); i++) { + found_cache = acpi_find_cache_node(table_hdr, acpi_cpu_id, + type[i], level, &cpu_node); + if (found_cache) { + cacheinfo[number_of_caches].level = level; + cacheinfo[number_of_caches].type = acpi_cache_type(type[i]); + number_of_caches++; + if (number_of_caches >= size) { + acpi_put_table(table_hdr); + return -ENOMEM; + } + } + } + level++; + } + acpi_put_table(table_hdr); + + return number_of_caches; +} + /** * cache_setup_acpi() - Override CPU cache topology with data from the PPTT * @cpu: Kernel logical CPU number diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h index 4f72b47973c3..7d37945d2650 100644 --- a/include/linux/cacheinfo.h +++ b/include/linux/cacheinfo.h @@ -79,6 +79,11 @@ struct cpu_cacheinfo { bool cpu_map_populated; }; +struct acpi_cacheinfo { + u8 level; + u8 type; +}; + /* * Helpers to make sure "func" is executed on the cpu whose cache * attributes are being detected @@ -114,8 +119,15 @@ static inline int acpi_find_last_cache_level(unsigned int cpu) { return 0; } +static inline int acpi_find_cache_info(unsigned int cpu, struct acpi_cacheinfo *cacheinfo, + size_t size) +{ + return 0; +} #else int acpi_find_last_cache_level(unsigned int cpu); +int acpi_find_cache_info(unsigned int cpu, struct acpi_cacheinfo *cacheinfo, + size_t size); #endif const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);