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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SA2PEPF00003AE7.mail.protection.outlook.com (10.167.248.7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7762.17 via Frontend Transport; Thu, 11 Jul 2024 10:29:06 +0000 Received: from shatadru.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Thu, 11 Jul 2024 05:28:59 -0500 From: Dhananjay Ugwekar To: , , , , , , , , , , , , , , , , , CC: , , , , , , , , , Subject: [PATCH v4 05/11] perf/x86/rapl: Move cpumask variable to rapl_pmus struct Date: Thu, 11 Jul 2024 10:24:33 +0000 Message-ID: <20240711102436.4432-6-Dhananjay.Ugwekar@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240711102436.4432-1-Dhananjay.Ugwekar@amd.com> References: <20240711102436.4432-1-Dhananjay.Ugwekar@amd.com> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003AE7:EE_|CH3PR12MB9314:EE_ X-MS-Office365-Filtering-Correlation-Id: 2618600f-cf65-4452-1e47-08dca1944b20 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|82310400026|36860700013|921020; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jul 2024 10:29:06.5208 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2618600f-cf65-4452-1e47-08dca1944b20 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003AE7.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9314 This patch is in preparation for addition of per-core energy counter support for AMD CPUs. Per-core energy counter PMU will need a separate cpumask. It seems like a better approach to add the cpumask inside the rapl_pmus struct, instead of creating another global cpumask variable for per-core PMU. This way, in future, if there is a need for a new PMU with a different scope (e.g. CCD), adding a new global cpumask variable won't be necessary. No functional change. Signed-off-by: Dhananjay Ugwekar --- Changes in v4: * Use cpumask_var_t instead of cpumask_t (Peter) --- arch/x86/events/rapl.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c index d231a9c068af..e3d0a82e12b9 100644 --- a/arch/x86/events/rapl.c +++ b/arch/x86/events/rapl.c @@ -122,6 +122,7 @@ struct rapl_pmu { struct rapl_pmus { struct pmu pmu; + cpumask_var_t cpumask; unsigned int nr_rapl_pmu; struct rapl_pmu *rapl_pmu[] __counted_by(nr_rapl_pmu); }; @@ -142,7 +143,6 @@ struct rapl_model { /* 1/2^hw_unit Joule */ static int rapl_hw_unit[NR_RAPL_DOMAINS] __read_mostly; static struct rapl_pmus *rapl_pmus; -static cpumask_t rapl_cpu_mask; static unsigned int rapl_cntr_mask; static u64 rapl_timer_ms; static struct perf_msr *rapl_msrs; @@ -401,7 +401,7 @@ static void rapl_pmu_event_read(struct perf_event *event) static ssize_t rapl_get_attr_cpumask(struct device *dev, struct device_attribute *attr, char *buf) { - return cpumap_print_to_pagebuf(true, buf, &rapl_cpu_mask); + return cpumap_print_to_pagebuf(true, buf, rapl_pmus->cpumask); } static DEVICE_ATTR(cpumask, S_IRUGO, rapl_get_attr_cpumask, NULL); @@ -572,7 +572,7 @@ static int rapl_cpu_offline(unsigned int cpu) int target; /* Check if exiting cpu is used for collecting rapl events */ - if (!cpumask_test_and_clear_cpu(cpu, &rapl_cpu_mask)) + if (!cpumask_test_and_clear_cpu(cpu, rapl_pmus->cpumask)) return 0; rapl_pmu->cpu = -1; @@ -581,7 +581,7 @@ static int rapl_cpu_offline(unsigned int cpu) /* Migrate rapl events to the new target */ if (target < nr_cpu_ids) { - cpumask_set_cpu(target, &rapl_cpu_mask); + cpumask_set_cpu(target, rapl_pmus->cpumask); rapl_pmu->cpu = target; perf_pmu_migrate_context(rapl_pmu->pmu, cpu, target); } @@ -613,11 +613,11 @@ static int rapl_cpu_online(unsigned int cpu) * Check if there is an online cpu in the package which collects rapl * events already. */ - target = cpumask_any_and(&rapl_cpu_mask, rapl_pmu_cpumask); + target = cpumask_any_and(rapl_pmus->cpumask, rapl_pmu_cpumask); if (target < nr_cpu_ids) return 0; - cpumask_set_cpu(cpu, &rapl_cpu_mask); + cpumask_set_cpu(cpu, rapl_pmus->cpumask); rapl_pmu->cpu = cpu; return 0; } @@ -710,6 +710,9 @@ static int __init init_rapl_pmus(void) rapl_pmus = kzalloc(struct_size(rapl_pmus, rapl_pmu, nr_rapl_pmu), GFP_KERNEL); if (!rapl_pmus) return -ENOMEM; + + if (!alloc_cpumask_var(&rapl_pmus->cpumask, GFP_KERNEL)) + return -ENOMEM; rapl_pmus->nr_rapl_pmu = nr_rapl_pmu; rapl_pmus->pmu.attr_groups = rapl_attr_groups;