From patchwork Thu Jun 12 17:13:36 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Morse X-Patchwork-Id: 895768 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 776D11E5B68 for ; Thu, 12 Jun 2025 17:14:11 +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=1749748453; cv=none; b=pwqEhlNPFL4QexjWbmMlLNZ9P7PmkqnCQgmE/iYpwbbpZGy0tm68pdtKUHp/jMHqAqYnlixdQUCGkFf8erivedoieteEoPjBDJtLFUZx767PcDEguOjCo4XhcwCdFpfbMs54mLjda0MtXWKpmCE8u44rwoPZSxi9k1wfE5TFJj0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749748453; c=relaxed/simple; bh=OQZFRvVHIwxHfRxW5AJVHtpN2QcJ4qff+VU6a5UufO0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=Yq4HSA7ovGAsCvT+UC3r1hMfOF4m4hlRTNAqxdUSrvejXjwdWka+ubtHiugF21gGWlF7BxLbtrLQiIdJ/f4L5qALgFJDVUjAfVTEwJ11MyStfjR5RKc5jH+I65JnSROVPvfAiSnVkLC2VogArYmwKJf3rBhWipQ0MtEoh2dYE/4= 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 633A11C25; Thu, 12 Jun 2025 10:13:50 -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 8EC393F59E; Thu, 12 Jun 2025 10:14:09 -0700 (PDT) From: James Morse To: linux-acpi@vger.kernel.org Cc: Rafael Wysocki , Len Brown , sudeep.holla@arm.com, jeremy.linton@arm.com, James Morse , Rohit Mathew Subject: [PATCH 4/4] ACPI / PPTT: Add a helper to fill a cpumask from a cache_id Date: Thu, 12 Jun 2025 17:13:36 +0000 Message-Id: <20250612171336.4858-5-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20250612171336.4858-1-james.morse@arm.com> References: <20250612171336.4858-1-james.morse@arm.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 MPAM identifies CPUs by the cache_id in the PPTT cache structure. The driver needs to know which CPUs are associated with the cache, the CPUs may not all be online, so cacheinfo does not have the information. Add a helper to pull this information out of the PPTT. CC: Rohit Mathew Signed-off-by: James Morse --- drivers/acpi/pptt.c | 70 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/acpi.h | 6 ++++ 2 files changed, 76 insertions(+) diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c index 09be7d52d7ac..0ecb9378787a 100644 --- a/drivers/acpi/pptt.c +++ b/drivers/acpi/pptt.c @@ -983,3 +983,73 @@ int find_acpi_cache_level_from_id(u32 cache_id) acpi_put_table(table); return -ENOENT; } + +/** + * acpi_pptt_get_cpumask_from_cache_id() - Get the cpus associated with the + * specified cache + * @cache_id: The id field of the unified cache + * @cpus: Where to build the cpumask + * + * Determine which CPUs are below this cache in the PPTT. This allows the property + * to be found even if the CPUs are offline. + * + * The PPTT table must be rev 3 or later, + * + * Return: -ENOENT if the PPTT doesn't exist, or the cache cannot be found. + * Otherwise returns 0 and sets the cpus in the provided cpumask. + */ +int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus) +{ + u32 acpi_cpu_id; + acpi_status status; + int level, cpu, num_levels; + struct acpi_pptt_cache *cache; + struct acpi_table_header *table; + struct acpi_pptt_cache_v1 *cache_v1; + struct acpi_pptt_processor *cpu_node; + + cpumask_clear(cpus); + + status = acpi_get_table(ACPI_SIG_PPTT, 0, &table); + if (ACPI_FAILURE(status)) { + acpi_pptt_warn_missing(); + return -ENOENT; + } + + if (table->revision < 3) { + acpi_put_table(table); + return -ENOENT; + } + + /* + * If we found the cache first, we'd still need to walk from each cpu. + */ + for_each_possible_cpu(cpu) { + acpi_cpu_id = get_acpi_id_for_cpu(cpu); + cpu_node = acpi_find_processor_node(table, acpi_cpu_id); + if (!cpu_node) + break; + acpi_count_levels(table, cpu_node, &num_levels, NULL); + + /* Start at 1 for L1 */ + for (level = 1; level <= num_levels; level++) { + cache = acpi_find_cache_node(table, acpi_cpu_id, + ACPI_PPTT_CACHE_TYPE_UNIFIED, + level, &cpu_node); + if (!cache) + continue; + + cache_v1 = ACPI_ADD_PTR(struct acpi_pptt_cache_v1, + cache, + sizeof(struct acpi_pptt_cache)); + + if (cache->flags & ACPI_PPTT_CACHE_ID_VALID && + cache_v1->cache_id == cache_id) { + cpumask_set_cpu(cpu, cpus); + } + } + } + + acpi_put_table(table); + return 0; +} diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 82947f6d2a43..61ac3d1de1e8 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1543,6 +1543,7 @@ int find_acpi_cpu_topology_package(unsigned int cpu); int find_acpi_cpu_topology_hetero_id(unsigned int cpu); int acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus); int find_acpi_cache_level_from_id(u32 cache_id); +int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus); #else static inline int acpi_pptt_cpu_is_thread(unsigned int cpu) { @@ -1573,6 +1574,11 @@ static inline int find_acpi_cache_level_from_id(u32 cache_id) { return -EINVAL; } +static inline int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, + cpumask_t *cpus) +{ + return -EINVAL; +} #endif void acpi_arch_init(void);