2024-04-22 21:27:34 +00:00
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From cbe56fa207de09512384969097114c3b9bd1d863 Mon Sep 17 00:00:00 2001
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2024-03-04 19:01:07 +00:00
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From: Steven Noonan <steven@uplinklabs.net>
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Date: Wed, 17 Nov 2021 00:26:20 -0800
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Subject: [PATCH 12/21] x86: save/restore TSC counter value during sleep/wake
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Signed-off-by: Steven Noonan <steven@uplinklabs.net>
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Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
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---
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arch/x86/kernel/acpi/sleep.c | 5 +++++
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arch/x86/realmode/rm/wakeup.h | 3 +++
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arch/x86/realmode/rm/wakeup_asm.S | 12 ++++++++++++
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3 files changed, 20 insertions(+)
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diff --git a/arch/x86/kernel/acpi/sleep.c b/arch/x86/kernel/acpi/sleep.c
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index 6dfecb27b846..07b7f6e578e8 100644
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--- a/arch/x86/kernel/acpi/sleep.c
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+++ b/arch/x86/kernel/acpi/sleep.c
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@@ -103,6 +103,11 @@ int x86_acpi_suspend_lowlevel(void)
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header->pmode_misc_en_high))
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header->pmode_behavior |=
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(1 << WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE);
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+ if (!rdmsr_safe(MSR_IA32_TSC,
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+ &header->pmode_tsc_low,
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+ &header->pmode_tsc_high))
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+ header->pmode_behavior |=
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+ (1 << WAKEUP_BEHAVIOR_RESTORE_TSC);
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header->realmode_flags = acpi_realmode_flags;
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header->real_magic = 0x12345678;
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diff --git a/arch/x86/realmode/rm/wakeup.h b/arch/x86/realmode/rm/wakeup.h
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index 0e4fd08ae447..c728d8563de1 100644
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--- a/arch/x86/realmode/rm/wakeup.h
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+++ b/arch/x86/realmode/rm/wakeup.h
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@@ -23,6 +23,8 @@ struct wakeup_header {
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u64 pmode_gdt;
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u32 pmode_misc_en_low; /* Protected mode MISC_ENABLE */
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u32 pmode_misc_en_high;
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+ u32 pmode_tsc_low;
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+ u32 pmode_tsc_high;
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u32 pmode_behavior; /* Wakeup routine behavior flags */
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u32 realmode_flags;
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u32 real_magic;
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@@ -39,5 +41,6 @@ extern struct wakeup_header wakeup_header;
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#define WAKEUP_BEHAVIOR_RESTORE_MISC_ENABLE 0
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#define WAKEUP_BEHAVIOR_RESTORE_CR4 1
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#define WAKEUP_BEHAVIOR_RESTORE_EFER 2
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+#define WAKEUP_BEHAVIOR_RESTORE_TSC 3
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#endif /* ARCH_X86_KERNEL_ACPI_RM_WAKEUP_H */
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diff --git a/arch/x86/realmode/rm/wakeup_asm.S b/arch/x86/realmode/rm/wakeup_asm.S
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index 02d0ba16ae33..0154ef895960 100644
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--- a/arch/x86/realmode/rm/wakeup_asm.S
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+++ b/arch/x86/realmode/rm/wakeup_asm.S
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@@ -27,6 +27,7 @@ SYM_DATA_START(wakeup_header)
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pmode_efer: .quad 0 /* Saved EFER */
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pmode_gdt: .quad 0
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pmode_misc_en: .quad 0 /* Saved MISC_ENABLE MSR */
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+ pmode_tsc: .quad 0 /* Saved TSC MSR */
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pmode_behavior: .long 0 /* Wakeup behavior flags */
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realmode_flags: .long 0
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real_magic: .long 0
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@@ -104,6 +105,17 @@ SYM_CODE_START(wakeup_start)
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wrmsr
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1:
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+ /* Restore TSC */
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+ movl pmode_behavior, %edi
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+ btl $WAKEUP_BEHAVIOR_RESTORE_TSC, %edi
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+ jnc 1f
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+
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+ movl pmode_tsc, %eax
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+ movl pmode_tsc + 4, %edx
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+ movl $MSR_IA32_TSC, %ecx
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+ wrmsr
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+1:
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+
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/* Do any other stuff... */
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#ifndef CONFIG_64BIT
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--
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2.44.0
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