linux-kernel - [tip:x86/mm] acpi: Introduce acpi_arch_get_root

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Date:   Mon, 26 Feb 2018 00:46:06 -0800
From:   tip-bot for Juergen Gross <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     keescook@...omium.org, tglx@...utronix.de, hpa@...or.com,
        peterz@...radead.org, bp@...en8.de, torvalds@...ux-foundation.org,
        rafael.j.wysocki@...el.com, mingo@...nel.org,
        kirill.shutemov@...ux.intel.com, ebiederm@...ssion.com,
        linux-kernel@...r.kernel.org, jgross@...e.com,
        andy.shevchenko@...il.com
Subject: [tip:x86/mm] acpi: Introduce acpi_arch_get_root_pointer() for
 getting rsdp address

Commit-ID:  dfc9327ab7c99bc13e12106448615efba833886b
Gitweb:     https://git.kernel.org/tip/dfc9327ab7c99bc13e12106448615efba833886b
Author:     Juergen Gross <jgross@...e.com>
AuthorDate: Mon, 19 Feb 2018 11:09:04 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 26 Feb 2018 08:43:20 +0100

acpi: Introduce acpi_arch_get_root_pointer() for getting rsdp address

Add an architecture specific function to get the address of the RSDP
table. Per default it will just return 0 indicating falling back to
the current mechanism.

Signed-off-by: Juergen Gross <jgross@...e.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: boris.ostrovsky@...cle.com
Cc: lenb@...nel.org
Cc: linux-acpi@...r.kernel.org
Cc: xen-devel@...ts.xenproject.org
Link: http://lkml.kernel.org/r/20180219100906.14265-2-jgross@suse.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/acpi/osl.c   | 5 ++++-
 include/linux/acpi.h | 7 +++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 3bb46cb24a99..7ca41bf023c9 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -189,12 +189,15 @@ early_param("acpi_rsdp", setup_acpi_rsdp);
 
 acpi_physical_address __init acpi_os_get_root_pointer(void)
 {
-	acpi_physical_address pa = 0;
+	acpi_physical_address pa;
 
 #ifdef CONFIG_KEXEC
 	if (acpi_rsdp)
 		return acpi_rsdp;
 #endif
+	pa = acpi_arch_get_root_pointer();
+	if (pa)
+		return pa;
 
 	if (efi_enabled(EFI_CONFIG_TABLES)) {
 		if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 968173ec2726..15bfb15c2fa5 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -623,6 +623,13 @@ bool acpi_gtdt_c3stop(int type);
 int acpi_arch_timer_mem_init(struct arch_timer_mem *timer_mem, int *timer_count);
 #endif
 
+#ifndef ACPI_HAVE_ARCH_GET_ROOT_POINTER
+static inline u64 acpi_arch_get_root_pointer(void)
+{
+	return 0;
+}
+#endif
+
 #else	/* !CONFIG_ACPI */
 
 #define acpi_disabled 1