From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/drivers/acpi/processor_perflib.c | 42 ++++++++++++++++++++++++++++++++----------
1 files changed, 32 insertions(+), 10 deletions(-)
diff --git a/kernel/drivers/acpi/processor_perflib.c b/kernel/drivers/acpi/processor_perflib.c
index b04a689..fc42d64 100644
--- a/kernel/drivers/acpi/processor_perflib.c
+++ b/kernel/drivers/acpi/processor_perflib.c
@@ -56,6 +56,8 @@
{
acpi_status status = 0;
unsigned long long ppc = 0;
+ s32 qos_value;
+ int index;
int ret;
if (!pr)
@@ -75,17 +77,30 @@
return -ENODEV;
}
- pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
- (int)ppc, ppc ? "" : "not");
+ index = ppc;
- pr->performance_platform_limit = (int)ppc;
-
- if (ppc >= pr->performance->state_count ||
- unlikely(!freq_qos_request_active(&pr->perflib_req)))
+ if (pr->performance_platform_limit == index ||
+ ppc >= pr->performance->state_count)
return 0;
- ret = freq_qos_update_request(&pr->perflib_req,
- pr->performance->states[ppc].core_frequency * 1000);
+ pr_debug("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
+ index, index ? "is" : "is not");
+
+ pr->performance_platform_limit = index;
+
+ if (unlikely(!freq_qos_request_active(&pr->perflib_req)))
+ return 0;
+
+ /*
+ * If _PPC returns 0, it means that all of the available states can be
+ * used ("no limit").
+ */
+ if (index == 0)
+ qos_value = FREQ_QOS_MAX_DEFAULT_VALUE;
+ else
+ qos_value = pr->performance->states[index].core_frequency * 1000;
+
+ ret = freq_qos_update_request(&pr->perflib_req, qos_value);
if (ret < 0) {
pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
pr->id, ret);
@@ -168,9 +183,16 @@
if (!pr)
continue;
+ /*
+ * Reset performance_platform_limit in case there is a stale
+ * value in it, so as to make it match the "no limit" QoS value
+ * below.
+ */
+ pr->performance_platform_limit = 0;
+
ret = freq_qos_add_request(&policy->constraints,
- &pr->perflib_req,
- FREQ_QOS_MAX, INT_MAX);
+ &pr->perflib_req, FREQ_QOS_MAX,
+ FREQ_QOS_MAX_DEFAULT_VALUE);
if (ret < 0)
pr_err("Failed to add freq constraint for CPU%d (%d)\n",
cpu, ret);
--
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