105 lines
3.4 KiB
Diff
105 lines
3.4 KiB
Diff
From: Juergen Gross <jgross@suse.com>
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Date: Wed, 10 Oct 2018 08:14:56 +0200
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Subject: x86/acpi, x86/boot: Take RSDP address for boot params if available
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Origin: https://git.kernel.org/linus/e7b66d16fe41722350ba87f5788052ef53ee28bb
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In case the RSDP address in struct boot_params is specified don't try
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to find the table by searching, but take the address directly as set
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by the boot loader.
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Signed-off-by: Juergen Gross <jgross@suse.com>
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Cc: Andy Lutomirski <luto@kernel.org>
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Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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Cc: Baoquan He <bhe@redhat.com>
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Cc: Borislav Petkov <bp@alien8.de>
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Cc: Jia Zhang <qianyue.zj@alibaba-inc.com>
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Cc: Len Brown <len.brown@intel.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Pavel Machek <pavel@ucw.cz>
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Cc: Pavel Tatashin <pasha.tatashin@oracle.com>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Cc: Thomas Gleixner <tglx@linutronix.de>
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Cc: boris.ostrovsky@oracle.com
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Cc: linux-kernel@vger.kernel.org
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Cc: linux-pm@vger.kernel.org
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Cc: xen-devel@lists.xenproject.org
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Link: http://lkml.kernel.org/r/20181010061456.22238-4-jgross@suse.com
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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---
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arch/x86/include/asm/acpi.h | 7 +++++++
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arch/x86/kernel/acpi/boot.c | 6 ++++++
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arch/x86/kernel/x86_init.c | 3 +--
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3 files changed, 14 insertions(+), 2 deletions(-)
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diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
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index a303d7b7d763..2f01eb4d6208 100644
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--- a/arch/x86/include/asm/acpi.h
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+++ b/arch/x86/include/asm/acpi.h
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@@ -142,6 +142,8 @@ static inline u64 acpi_arch_get_root_pointer(void)
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void acpi_generic_reduced_hw_init(void);
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+u64 x86_default_get_root_pointer(void);
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+
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#else /* !CONFIG_ACPI */
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#define acpi_lapic 0
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@@ -153,6 +155,11 @@ static inline void disable_acpi(void) { }
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static inline void acpi_generic_reduced_hw_init(void) { }
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+static inline u64 x86_default_get_root_pointer(void)
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+{
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+ return 0;
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+}
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+
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#endif /* !CONFIG_ACPI */
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#define ARCH_HAS_POWER_INIT 1
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diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
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index 3b20607d581b..e8fea7ffa306 100644
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--- a/arch/x86/kernel/acpi/boot.c
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+++ b/arch/x86/kernel/acpi/boot.c
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@@ -48,6 +48,7 @@
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#include <asm/mpspec.h>
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#include <asm/smp.h>
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#include <asm/i8259.h>
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+#include <asm/setup.h>
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#include "sleep.h" /* To include x86_acpi_suspend_lowlevel */
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static int __initdata acpi_force = 0;
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@@ -1771,3 +1772,8 @@ void __init arch_reserve_mem_area(acpi_physical_address addr, size_t size)
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e820__range_add(addr, size, E820_TYPE_ACPI);
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e820__update_table_print();
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}
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+
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+u64 x86_default_get_root_pointer(void)
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+{
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+ return boot_params.hdr.acpi_rsdp_addr;
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+}
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diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
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index 2792b5573818..50a2b492fdd6 100644
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--- a/arch/x86/kernel/x86_init.c
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+++ b/arch/x86/kernel/x86_init.c
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@@ -31,7 +31,6 @@ static int __init iommu_init_noop(void) { return 0; }
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static void iommu_shutdown_noop(void) { }
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static bool __init bool_x86_init_noop(void) { return false; }
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static void x86_op_int_noop(int cpu) { }
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-static u64 u64_x86_init_noop(void) { return 0; }
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/*
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* The platform setup functions are preset with the default functions
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@@ -96,7 +95,7 @@ struct x86_init_ops x86_init __initdata = {
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},
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.acpi = {
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- .get_root_pointer = u64_x86_init_noop,
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+ .get_root_pointer = x86_default_get_root_pointer,
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.reduced_hw_early_init = acpi_generic_reduced_hw_init,
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},
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};
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--
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2.19.2
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