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Date: Fri, 31 May 2024 07:04:21 +0000
From: "Linda Chai(BJ-RD)" <LindaChai@...oxin.com>
To: "ricardo.neri-calderon@...ux.intel.com"
<ricardo.neri-calderon@...ux.intel.com>
CC: "Cobe Chen(BJ-RD)" <CobeChen@...oxin.com>, LeoLiu-oc
<LeoLiu-oc@...oxin.com>, "Linda Chai(BJ-RD)" <LindaChai@...oxin.com>, "Tim
Guo(BJ-RD)" <TimGuo@...oxin.com>, Tony W Wang-oc <TonyWWang-oc@...oxin.com>,
"acpica-devel@...ts.linux.dev" <acpica-devel@...ts.linux.dev>, "bp@...en8.de"
<bp@...en8.de>, "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
"hpa@...or.com" <hpa@...or.com>, "j.granados@...sung.com"
<j.granados@...sung.com>, "lenb@...nel.org" <lenb@...nel.org>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "mcgrof@...nel.org"
<mcgrof@...nel.org>, "mingo@...hat.com" <mingo@...hat.com>,
"peterz@...radead.org" <peterz@...radead.org>, "rafael@...nel.org"
<rafael@...nel.org>, "robert.moore@...el.com" <robert.moore@...el.com>,
"tglx@...utronix.de" <tglx@...utronix.de>, "viresh.kumar@...aro.org"
<viresh.kumar@...aro.org>, "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH 3/3] ACPI: cpufreq: Add ITMT support when CPPC enabled for
Zhaoxin CPUs
Hi ,Ricardo
About this itmt dumplicated code in intel-pstate and acpi-cpufreq driver;
how about we put these common codes in arch/x86/kernel/itmt.c?
in intel-pstate/acpi-cpufreq driver, it only get highest frequency through cppc interface and call sched_set_itmt_core_prio provided by itmt.c;
in the sched_set_itmt_core_prio, do these following works:
1) set core priorty according to the highest frequency;
2) check whether cores’highest frequencies are different, if yes, set itmt capable & enable;
3) check whether all online cores have updated core priority, which guarantee rebuild_sched_domains will get the correct priority info for each online core;
Following this rule, the patch looks like this:
diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c
index 9a7c03d47861..eb24df2826bc 100644
--- a/arch/x86/kernel/itmt.c
+++ b/arch/x86/kernel/itmt.c
@@ -22,6 +22,7 @@
#include <linux/mutex.h>
#include <linux/sysctl.h>
#include <linux/nodemask.h>
+#include <linux/itmt.h>
static DEFINE_MUTEX(itmt_update_mutex);
DEFINE_PER_CPU_READ_MOSTLY(int, sched_core_priority);
@@ -162,6 +163,13 @@ int arch_asym_cpu_priority(int cpu)
return per_cpu(sched_core_priority, cpu);
}
+/* 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);
+
/**
* sched_set_itmt_core_prio() - Set CPU priority based on ITMT
* @prio: Priority of @cpu
@@ -176,7 +184,36 @@ int arch_asym_cpu_priority(int cpu)
* the CPU priorities. The sched domains have no
* dependency on CPU priorities.
*/
+
+static u64 max_highest_prio = 0, min_highest_prio = U64_MAX;
+static bool core_priority_diff=false;
+static struct cpumask core_prio_cpumask;
void sched_set_itmt_core_prio(int prio, int cpu)
{
per_cpu(sched_core_priority, cpu) = prio;
+ cpumask_set_cpu(cpu, &core_prio_cpumask);
+
+ if (max_highest_prio <= min_highest_prio)
+ {
+ if (prio > max_highest_prio)
+ max_highest_prio = prio;
+
+ if (prio < min_highest_prio)
+ min_highest_prio = prio;
+
+ if (max_highest_prio > min_highest_prio)
+ core_priority_diff = true;
+ }
+
+ if (core_priority_diff && cpumask_equal(&core_prio_cpumask, cpu_online_mask))
+ {
+ /*
+ * This code can be run during CPU online under the CPU hotplug locks,
+ * so sched_set_itmt cannot be called from here.
+ * queue a work item to invoke it
+ */
+ pr_debug("queue a work to set itmt support and enable\n");
+ schedule_work(&sched_itmt_work);
+ }
+
}
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 37f1cdf46d29..3e5e0f66b2ed 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -30,6 +30,7 @@
#include <acpi/processor.h>
#include <acpi/cppc_acpi.h>
+#include <linux/itmt.h>
#include <asm/msr.h>
#include <asm/processor.h>
#include <asm/cpufeature.h>
@@ -663,8 +664,17 @@ static u64 get_max_boost_ratio(unsigned int cpu)
return div_u64(highest_perf << SCHED_CAPACITY_SHIFT, nominal_perf);
}
+
+static void core_set_itmt_prio(int cpu)
+{
+ u64 highest_perf;
+ cppc_get_highest_perf(cpu, &highest_perf);
+ sched_set_itmt_core_prio(highest_perf, cpu);
+}
+
#else
static inline u64 get_max_boost_ratio(unsigned int cpu) { return 0; }
+static void core_set_itmt_prio(int cpu) {}
#endif
static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
@@ -677,7 +687,7 @@ 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;
#ifdef CONFIG_SMP
static int blacklisted;
#endif
@@ -741,6 +751,10 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
pr_info_once("overriding BIOS provided _PSD data\n");
}
#endif
+ for_each_cpu(j,policy->cpus)
+ {
+ core_set_itmt_prio(j);
+ }
/* capability check */
if (perf->state_count <= 1) {
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index dbbf299f4219..4b04e6db9d5b 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -27,6 +27,7 @@
#include <linux/pm_qos.h>
#include <linux/bitfield.h>
#include <trace/events/power.h>
+#include <linux/itmt.h>
#include <asm/cpu.h>
#include <asm/div64.h>
@@ -340,23 +341,14 @@ static bool intel_pstate_get_ppc_enable_status(void)
#ifdef CONFIG_ACPI_CPPC_LIB
-/* The work item is needed to avoid CPU hotplug locking issues */
-static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)
-{
- sched_set_itmt_support();
-}
-
-static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);
-
#define CPPC_MAX_PERF U8_MAX
static void intel_pstate_set_itmt_prio(int cpu)
{
- struct cppc_perf_caps cppc_perf;
- static u32 max_highest_perf = 0, min_highest_perf = U32_MAX;
+ u64 highest_perf;
int ret;
- ret = cppc_get_perf_caps(cpu, &cppc_perf);
+ ret = cppc_get_highest_perf(cpu,&highest_perf);
if (ret)
return;
@@ -365,33 +357,15 @@ static void intel_pstate_set_itmt_prio(int cpu)
* In this case we can't use CPPC.highest_perf to enable ITMT.
* In this case we can look at MSR_HWP_CAPABILITIES bits [8:0] to decide.
*/
- if (cppc_perf.highest_perf == CPPC_MAX_PERF)
- cppc_perf.highest_perf = HWP_HIGHEST_PERF(READ_ONCE(all_cpu_data[cpu]->hwp_cap_cached));
+ if (highest_perf == CPPC_MAX_PERF)
+ highest_perf = HWP_HIGHEST_PERF(READ_ONCE(all_cpu_data[cpu]->hwp_cap_cached));
/*
* The priorities can be set regardless of whether or not
* sched_set_itmt_support(true) has been called and it is valid to
* update them at any time after it has been called.
*/
- sched_set_itmt_core_prio(cppc_perf.highest_perf, cpu);
-
- if (max_highest_perf <= min_highest_perf) {
- if (cppc_perf.highest_perf > max_highest_perf)
- max_highest_perf = cppc_perf.highest_perf;
-
- if (cppc_perf.highest_perf < min_highest_perf)
- min_highest_perf = cppc_perf.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.
- */
- schedule_work(&sched_itmt_work);
- }
- }
+ sched_set_itmt_core_prio(highest_perf, cpu);
}
static int intel_pstate_get_cppc_guaranteed(int cpu)
Thanks
Linda
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