From 2f7c68cb55ecb7331f2381deb497c27155f32faf Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 03 Jan 2024 09:43:39 +0000
Subject: [PATCH] update kernel to 5.10.198
---
kernel/arch/x86/kernel/acpi/cstate.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/kernel/arch/x86/kernel/acpi/cstate.c b/kernel/arch/x86/kernel/acpi/cstate.c
index 49ae4e1..d28d43d 100644
--- a/kernel/arch/x86/kernel/acpi/cstate.c
+++ b/kernel/arch/x86/kernel/acpi/cstate.c
@@ -79,6 +79,21 @@
*/
flags->bm_control = 0;
}
+ if (c->x86_vendor == X86_VENDOR_AMD && c->x86 >= 0x17) {
+ /*
+ * For all AMD Zen or newer CPUs that support C3, caches
+ * should not be flushed by software while entering C3
+ * type state. Set bm->check to 1 so that kernel doesn't
+ * need to execute cache flush operation.
+ */
+ flags->bm_check = 1;
+ /*
+ * In current AMD C state implementation ARB_DIS is no longer
+ * used. So set bm_control to zero to indicate ARB_DIS is not
+ * required while entering C3 type state.
+ */
+ flags->bm_control = 0;
+ }
}
EXPORT_SYMBOL(acpi_processor_power_init_bm_check);
--
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