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Shenoy" CC: Perry Yuan , , , Dhananjay Ugwekar , Mario Limonciello Subject: [PATCH 11/15] cpufreq/amd-pstate: Cache EPP value and use that everywhere Date: Thu, 5 Dec 2024 16:28:43 -0600 Message-ID: <20241205222847.7889-12-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241205222847.7889-1-mario.limonciello@amd.com> References: <20241205222847.7889-1-mario.limonciello@amd.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH1PEPF0000A347:EE_|PH7PR12MB6884:EE_ X-MS-Office365-Filtering-Correlation-Id: 2d07fbd9-79a5-4484-86d5-08dd157c3e00 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|36860700013|1800799024|376014|82310400026; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17; CTRY:US; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:SATLEXMB04.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(36860700013)(1800799024)(376014)(82310400026); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Dec 2024 22:29:11.5890 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2d07fbd9-79a5-4484-86d5-08dd157c3e00 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: CH1PEPF0000A347.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6884 Cache the value in cpudata->epp_cached, and use that for all callers. As all callers use cached value merge amd_pstate_get_energy_pref_index() into show_energy_performance_preference(). Check if the EPP value is changed before writing it to MSR or shared memory region. Signed-off-by: Mario Limonciello --- drivers/cpufreq/amd-pstate.c | 107 +++++++++++++++-------------------- 1 file changed, 45 insertions(+), 62 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 5ee53b45c1ca1..20de3a9fd992d 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -186,29 +186,28 @@ static inline int get_mode_idx_from_str(const char *str, size_t size) static DEFINE_MUTEX(amd_pstate_limits_lock); static DEFINE_MUTEX(amd_pstate_driver_lock); -static s16 msr_get_epp(struct amd_cpudata *cpudata, u64 cppc_req_cached) +static s16 msr_get_epp(struct amd_cpudata *cpudata) { + u64 value; int ret; - if (!cppc_req_cached) { - ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, &cppc_req_cached); - if (ret < 0) { - pr_debug("Could not retrieve energy perf value (%d)\n", ret); - return ret; - } + ret = rdmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, &value); + if (ret < 0) { + pr_debug("Could not retrieve energy perf value (%d)\n", ret); + return ret; } - return FIELD_GET(AMD_PSTATE_EPP_PERF_MASK, cppc_req_cached); + return FIELD_GET(AMD_PSTATE_EPP_PERF_MASK, value); } DEFINE_STATIC_CALL(amd_pstate_get_epp, msr_get_epp); -static inline s16 amd_pstate_get_epp(struct amd_cpudata *cpudata, u64 cppc_req_cached) +static inline s16 amd_pstate_get_epp(struct amd_cpudata *cpudata) { - return static_call(amd_pstate_get_epp)(cpudata, cppc_req_cached); + return static_call(amd_pstate_get_epp)(cpudata); } -static s16 shmem_get_epp(struct amd_cpudata *cpudata, u64 dummy) +static s16 shmem_get_epp(struct amd_cpudata *cpudata) { u64 epp; int ret; @@ -222,35 +221,6 @@ static s16 shmem_get_epp(struct amd_cpudata *cpudata, u64 dummy) return (s16)(epp & 0xff); } -static int amd_pstate_get_energy_pref_index(struct amd_cpudata *cpudata) -{ - s16 epp; - int index = -EINVAL; - - epp = amd_pstate_get_epp(cpudata, 0); - if (epp < 0) - return epp; - - switch (epp) { - case AMD_CPPC_EPP_PERFORMANCE: - index = EPP_INDEX_PERFORMANCE; - break; - case AMD_CPPC_EPP_BALANCE_PERFORMANCE: - index = EPP_INDEX_BALANCE_PERFORMANCE; - break; - case AMD_CPPC_EPP_BALANCE_POWERSAVE: - index = EPP_INDEX_BALANCE_POWERSAVE; - break; - case AMD_CPPC_EPP_POWERSAVE: - index = EPP_INDEX_POWERSAVE; - break; - default: - break; - } - - return index; -} - static int msr_update_perf(struct amd_cpudata *cpudata, u32 min_perf, u32 des_perf, u32 max_perf, bool fast_switch) { @@ -275,19 +245,23 @@ static inline int amd_pstate_update_perf(struct amd_cpudata *cpudata, static int msr_set_epp(struct amd_cpudata *cpudata, u32 epp) { - u64 value = READ_ONCE(cpudata->cppc_req_cached); + u64 value, prev; int ret; + value = prev = READ_ONCE(cpudata->cppc_req_cached); value &= ~AMD_PSTATE_EPP_PERF_MASK; value |= FIELD_PREP(AMD_PSTATE_EPP_PERF_MASK, epp); + if (value == prev) + return 0; + ret = wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value); if (ret) { pr_err("failed to set energy perf value (%d)\n", ret); return ret; } - cpudata->epp_cached = epp; + WRITE_ONCE(cpudata->epp_cached, epp); WRITE_ONCE(cpudata->cppc_req_cached, value); return ret; @@ -305,13 +279,16 @@ static int shmem_set_epp(struct amd_cpudata *cpudata, u32 epp) int ret; struct cppc_perf_ctrls perf_ctrls; + if (epp == cpudata->epp_cached) + return 0; + perf_ctrls.energy_perf = epp; ret = cppc_set_epp_perf(cpudata->cpu, &perf_ctrls, 1); if (ret) { pr_debug("failed to set energy perf value (%d)\n", ret); return ret; } - cpudata->epp_cached = epp; + WRITE_ONCE(cpudata->epp_cached, epp); return ret; } @@ -1216,9 +1193,22 @@ static ssize_t show_energy_performance_preference( struct amd_cpudata *cpudata = policy->driver_data; int preference; - preference = amd_pstate_get_energy_pref_index(cpudata); - if (preference < 0) - return preference; + switch (cpudata->epp_cached) { + case AMD_CPPC_EPP_PERFORMANCE: + preference = EPP_INDEX_PERFORMANCE; + break; + case AMD_CPPC_EPP_BALANCE_PERFORMANCE: + preference = EPP_INDEX_BALANCE_PERFORMANCE; + break; + case AMD_CPPC_EPP_BALANCE_POWERSAVE: + preference = EPP_INDEX_BALANCE_POWERSAVE; + break; + case AMD_CPPC_EPP_POWERSAVE: + preference = EPP_INDEX_POWERSAVE; + break; + default: + return -EINVAL; + } return sysfs_emit(buf, "%s\n", energy_perf_strings[preference]); } @@ -1503,7 +1493,7 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy) policy->driver_data = cpudata; - cpudata->epp_cached = cpudata->epp_default = amd_pstate_get_epp(cpudata, 0); + cpudata->epp_cached = cpudata->epp_default = amd_pstate_get_epp(cpudata); policy->min = policy->cpuinfo.min_freq; policy->max = policy->cpuinfo.max_freq; @@ -1557,35 +1547,26 @@ static int amd_pstate_epp_update_limit(struct cpufreq_policy *policy) { struct amd_cpudata *cpudata = policy->driver_data; u64 value; - s16 epp; amd_pstate_update_min_max_limit(policy); value = READ_ONCE(cpudata->cppc_req_cached); value &= ~(AMD_PSTATE_MAX_PERF_MASK | AMD_PSTATE_MIN_PERF_MASK | - AMD_PSTATE_DES_PERF_MASK); + AMD_PSTATE_DES_PERF_MASK | AMD_PSTATE_EPP_PERF_MASK); value |= FIELD_PREP(AMD_PSTATE_MAX_PERF_MASK, cpudata->max_limit_perf); value |= FIELD_PREP(AMD_PSTATE_DES_PERF_MASK, 0); value |= FIELD_PREP(AMD_PSTATE_MIN_PERF_MASK, cpudata->min_limit_perf); - /* Get BIOS pre-defined epp value */ - epp = amd_pstate_get_epp(cpudata, value); - if (epp < 0) { - /** - * This return value can only be negative for shared_memory - * systems where EPP register read/write not supported. - */ - return epp; - } - if (cpudata->policy == CPUFREQ_POLICY_PERFORMANCE) - epp = 0; + WRITE_ONCE(cpudata->epp_cached, 0); + value |= FIELD_PREP(AMD_PSTATE_EPP_PERF_MASK, cpudata->epp_cached); WRITE_ONCE(cpudata->cppc_req_cached, value); if (trace_amd_pstate_epp_perf_enabled()) { - trace_amd_pstate_epp_perf(cpudata->cpu, cpudata->highest_perf, epp, + trace_amd_pstate_epp_perf(cpudata->cpu, cpudata->highest_perf, + cpudata->epp_cached, cpudata->min_limit_perf, cpudata->max_limit_perf, cpudata->boost_state); @@ -1594,7 +1575,7 @@ static int amd_pstate_epp_update_limit(struct cpufreq_policy *policy) amd_pstate_update_perf(cpudata, cpudata->min_limit_perf, 0U, cpudata->max_limit_perf, false); - return amd_pstate_set_epp(cpudata, epp); + return amd_pstate_set_epp(cpudata, READ_ONCE(cpudata->epp_cached)); } static int amd_pstate_epp_set_policy(struct cpufreq_policy *policy) @@ -1610,6 +1591,8 @@ static int amd_pstate_epp_set_policy(struct cpufreq_policy *policy) cpudata->policy = policy->policy; + guard(mutex)(&amd_pstate_limits_lock); + ret = amd_pstate_epp_update_limit(policy); if (ret) return ret;