From 25d962081cde0e153a1377933e916bcee4a874ab Mon Sep 17 00:00:00 2001 From: leoliu-oc Date: Tue, 4 Nov 2025 09:46:43 +0800 Subject: [PATCH 1/2] cpufreq: ACPI: add ITMT support when CPPC enabled zhaoxin inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IA61ZD CVE: NA ------------------- The _CPC method can get per-core highest frequency. The highest frequency may varies between cores which mean cores can running at different max frequency, so can use it as a core priority and give a hint to scheduler in order to put critical task to the higher priority core. Signed-off-by: leoliu-oc --- arch/x86/kernel/itmt.c | 2 ++ drivers/cpufreq/acpi-cpufreq.c | 64 +++++++++++++++++++++++++++++++++- 2 files changed, 65 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c index 1afbdd1dd777..458d2790d9be 100644 --- a/arch/x86/kernel/itmt.c +++ b/arch/x86/kernel/itmt.c @@ -131,6 +131,7 @@ int sched_set_itmt_support(void) return 0; } +EXPORT_SYMBOL_GPL(sched_set_itmt_support); /** * sched_clear_itmt_support() - Revoke platform's support of ITMT @@ -203,3 +204,4 @@ void sched_set_itmt_core_prio(int prio, int core_cpu) i++; } } +EXPORT_SYMBOL_GPL(sched_set_itmt_core_prio); diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index 3f9150909126..54ebfd22508c 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -634,6 +634,9 @@ static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c) #endif #ifdef CONFIG_ACPI_CPPC_LIB +static bool cppc_highest_perf_diff; +static struct cpumask core_prior_mask; + static u64 get_max_boost_ratio(unsigned int cpu) { struct cppc_perf_caps perf_caps; @@ -665,8 +668,59 @@ static u64 get_max_boost_ratio(unsigned int cpu) return div_u64(highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf); } + +/* The work item is needed to avoid CPU hotplug locking issues */ +static void sched_itmt_work_fn(struct work_struct *work) +{ + sched_set_itmt_support(); +} + +static DECLARE_WORK(sched_itmt_work, sched_itmt_work_fn); + +static void core_set_itmt_prio(int cpu) +{ + struct cppc_perf_caps perf_caps; + u64 highest_perf = 0; + static u32 max_highest_perf = 0, min_highest_perf = U32_MAX; + int ret; + + ret = cppc_get_perf_caps(cpu, &perf_caps); + if (ret) { + pr_debug("CPU%d: Unable to get performance capabilities (%d)\n", cpu, ret); + return; + } + + highest_perf = perf_caps.highest_perf; + + sched_set_itmt_core_prio(highest_perf, cpu); + cpumask_set_cpu(cpu, &core_prior_mask); + + if (max_highest_perf <= min_highest_perf) { + if (perf_caps.highest_perf > max_highest_perf) + max_highest_perf = perf_caps.highest_perf; + + if (perf_caps.highest_perf < min_highest_perf) + min_highest_perf = perf_caps.highest_perf; + + if (max_highest_perf > min_highest_perf) { + /* + * This code can be run during CPU online under the + * CPU hotplug locks, so sched_set_itmt_support() + * cannot be called from here. Queue up a work item + * to invoke it. + */ + cppc_highest_perf_diff = true; + } + } + + if (cppc_highest_perf_diff && cpumask_equal(&core_prior_mask, cpu_online_mask)) { + pr_debug("queue a work to set itmt enabled\n"); + schedule_work(&sched_itmt_work); + } +} #else static inline u64 get_max_boost_ratio(unsigned int cpu) { return 0; } +static inline void core_set_itmt_prio(int cpu) { } #endif static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) @@ -679,7 +733,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) unsigned int valid_states = 0; unsigned int result = 0; u64 max_boost_ratio; - unsigned int i; + unsigned int i, j = 0; #ifdef CONFIG_SMP static int blacklisted; #endif @@ -744,6 +798,14 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy) } #endif +#if defined(CONFIG_CPU_SUP_ZHAOXIN) || defined(CONFIG_CPU_SUP_CENTAUR) + if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR || + boot_cpu_data.x86_vendor == X86_VENDOR_ZHAOXIN) { + for_each_cpu(j, policy->cpus) + core_set_itmt_prio(j); + } +#endif + /* capability check */ if (perf->state_count <= 1) { pr_debug("No P-States\n"); -- Gitee From 87c5c4a179c4b339998ed387a4fffbb8bdd815f9 Mon Sep 17 00:00:00 2001 From: leoliu-oc Date: Tue, 4 Nov 2025 09:46:46 +0800 Subject: [PATCH 2/2] Set ASYM_PACKING Flag on Zhaoxin KH-40000 platform zhaoxin inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IA60NZ CVE: NA -------------------- Set ASYM_PACKING Flag on Zhaoxin KH-40000 platform Signed-off-by: leoliu-oc --- kernel/sched/topology.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index 3a8673a1a3fc..9e15f429e4f3 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -2465,6 +2465,17 @@ build_sched_domains(const struct cpumask *cpu_map, struct sched_domain_attr *att } } +#ifdef CONFIG_X86 + if ((boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR || + boot_cpu_data.x86_vendor == X86_VENDOR_ZHAOXIN) && + (boot_cpu_data.x86 == 7 && boot_cpu_data.x86_model == 0x5b)) { + for_each_cpu(i, cpu_map) { + for (sd = *per_cpu_ptr(d.sd, i); sd; sd = sd->parent) + sd->flags |= SD_ASYM_PACKING; + } + } +#endif + /* Calculate CPU capacity for physical packages and nodes */ for (i = nr_cpumask_bits-1; i >= 0; i--) { if (!cpumask_test_cpu(i, cpu_map)) -- Gitee