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Wysocki" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Wang Qing Subject: [PATCH 1/2] arch_topology: support for describing cache topology from DT Date: Thu, 21 Apr 2022 07:55:57 -0700 Message-Id: <1650552960-60165-2-git-send-email-wangqing@vivo.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1650552960-60165-1-git-send-email-wangqing@vivo.com> References: <1650552960-60165-1-git-send-email-wangqing@vivo.com> Content-Type: text/plain X-ClientProxiedBy: TY2PR02CA0005.apcprd02.prod.outlook.com (2603:1096:404:56::17) To SL2PR06MB3082.apcprd06.prod.outlook.com (2603:1096:100:37::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6e098ae7-9425-4fde-9901-08da23a71980 X-MS-TrafficTypeDiagnostic: KL1PR0601MB4308:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: uXWuqiXzwQSAHnADQQXOVJPnNFo+DFShzWw0oLj3OwEbT1/RP2iAFkjFgAgwITIzk42kOMah+qDJx//swCHjQmcM99yH3VcF8ELYP/tXxdAkS6PN5hbdVotyxcXCx0GCK8JUqgM0wjlLAaN9p6bmKIqUfQ6YCHh03tWrddrIZ859zSzfzX3164T+0cJ5q6UUL3X504t++cni4DlAzWnordMOMl9nvdUC90+l6XhOaSYjYcDEnoyeICkDNsOlZK6imp9TxBrkpko8MLOH5AnpH1WJKpTLazreIArwYR/dEIfTRgAVKWyCAacvImrHYPN2LQGhAGzq74+IJcIPC0qz8o4NsKAmCwUQqE/VSIOoIsQtuIccYMl1+IfvWTEq2oHOX0+ZcJbYcINnU3MPbingDcoasDX8th1nCMnRh/MyBuN/eF7l9Y0ZIhwYxrN3EqUga3JN+Y9DohV6REsfuAtlBrM0h0LfHqe3yCt5YsY1qTTksgNjB4+NnlHOPC3JEVxcf5iVVAQ2eZyev+q2DOylkCUJ6fq3R/eMqIj6eUz4F9Fk6tr4DSvRsZPLTXI4ZyBCJtgDgvVCwPW9/c7p5v5Lcw6G+i8dlOrczZIVZliOwXi1zybC420E/CfGdY8l34duagz+DC4X+MOAAZGjTEMOvR0fUccGhJdrElI/SNjbDsiZPhqx/1dd16ATePxVvglqL/c7F+zD2yDmc+TC7KW8vg== X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SL2PR06MB3082.apcprd06.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(4636009)(366004)(6486002)(38100700002)(38350700002)(8936002)(508600001)(26005)(86362001)(316002)(110136005)(52116002)(107886003)(4326008)(186003)(66556008)(36756003)(83380400001)(6506007)(66946007)(6512007)(2906002)(5660300002)(66476007)(2616005)(6666004)(8676002);DIR:OUT;SFP:1102; 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* L2_1: l2-cache { * compatible = "cache"; * next-level-cache = <&L3_1>; * }; * L3_1: l3-cache { * compatible = "cache"; * }; * }; * * cpu1: cpu@001 { * next-level-cache = <&L2_1>; * }; * ... * }; cache_topology hold the pointer describing "next-level-cache", it can describe the cache topology of every level. Signed-off-by: Wang Qing --- drivers/base/arch_topology.c | 47 ++++++++++++++++++++++++++++++++++- include/linux/arch_topology.h | 3 +++ 2 files changed, 49 insertions(+), 1 deletion(-) diff --git a/drivers/base/arch_topology.c b/drivers/base/arch_topology.c index 1d6636ebaac5..46e84ce2ec0c 100644 --- a/drivers/base/arch_topology.c +++ b/drivers/base/arch_topology.c @@ -480,8 +480,10 @@ static int __init get_cpu_for_node(struct device_node *node) return -1; cpu = of_cpu_node_to_id(cpu_node); - if (cpu >= 0) + if (cpu >= 0) { topology_parse_cpu_capacity(cpu_node, cpu); + topology_parse_cpu_caches(cpu_node, cpu); + } else pr_info("CPU node for %pOF exist but the possible cpu range is :%*pbl\n", cpu_node, cpumask_pr_args(cpu_possible_mask)); @@ -647,6 +649,49 @@ static int __init parse_dt_topology(void) } #endif +/* + * cpu cache topology table + */ +#define MAX_CACHE_LEVEL 7 +staic struct device_node *cache_topology[NR_CPUS][MAX_CACHE_LEVEL]; + +void topology_parse_cpu_caches(struct device_node *cpu_node, int cpu) +{ + struct device_node *node_cache = cpu_node; + int level = 0; + + while (level < MAX_CACHE_LEVEL) { + node_cache = of_parse_phandle(node_cache, "next-level-cache", 0); + if (!node_cache) + break; + + cache_topology[cpu][level++] = node_cache; + } +} + +/* + * find the maximum level shared cache under giving mask + */ +void find_max_sub_sc(const struct cpumask *giving_mask, int cpu, + struct cpumask *sc_mask) +{ + int cache_level, cpu_id; + + for (cache_level = MAX_CACHE_LEVEL - 1; cache_level >= 0; cache_level--) { + if (!cache_topology[cpu][cache_level]) + continue; + + cpumask_clear(sc_mask); + for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++) { + if (cache_topology[cpu][cache_level] == cache_topology[cpu_id][cache_level]) + cpumask_set_cpu(cpu_id, sc_mask); + } + + if (cpumask_subset(sc_mask, giving_mask)) + break; + } +} + /* * cpu topology table */ diff --git a/include/linux/arch_topology.h b/include/linux/arch_topology.h index 58cbe18d825c..c6ed727e453c 100644 --- a/include/linux/arch_topology.h +++ b/include/linux/arch_topology.h @@ -93,6 +93,9 @@ void update_siblings_masks(unsigned int cpu); void remove_cpu_topology(unsigned int cpuid); void reset_cpu_topology(void); int parse_acpi_topology(void); +void topology_parse_cpu_caches(struct device_node *cpu_node, int cpu); +void find_max_sub_sc(const struct cpumask *giving_mask, int cpu, + struct cpumask *sc_mask); #endif #endif /* _LINUX_ARCH_TOPOLOGY_H_ */ -- 2.27.0.windows.1