linux-kernel - [PATCH v2 1/2] x86/UV: Introduce a helper function to check UV system at earlier stage

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Message-Id: <1495281758-11320-2-git-send-email-bhe@redhat.com>
Date:   Sat, 20 May 2017 20:02:37 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Baoquan He <bhe@...hat.com>, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Russ Anderson <rja@....com>,
        Dimitri Sivanich <sivanich@....com>,
        "travis@....com" <travis@....com>,
        Mike Travis <mike.travis@....com>,
        Frank Ramsay <frank.ramsay@....com>
Subject: [PATCH v2 1/2] x86/UV: Introduce a helper function to check UV system at earlier stage

The SGI BIOS adds UVsystab, and only systems running SGI BIOS
(and now HPE Hawks2) will have UVsystab. And UVsystab is detected in
efi_init() which is at very early stage. So introduce a new helper
function is_early_uv_system() for later usage.

Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Cc: Russ Anderson <rja@....com>
Cc: Dimitri Sivanich <sivanich@....com>
Cc: "travis@....com" <travis@....com>
Cc: Mike Travis <mike.travis@....com>
Cc: Frank Ramsay <frank.ramsay@....com>
---
 arch/x86/include/asm/uv/uv.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h
index 6686820..159f698 100644
--- a/arch/x86/include/asm/uv/uv.h
+++ b/arch/x86/include/asm/uv/uv.h
@@ -19,6 +19,11 @@ extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
 						 unsigned long start,
 						 unsigned long end,
 						 unsigned int cpu);
+#include <linux/efi.h>
+static inline int is_early_uv_system(void)
+{
+	return !((efi.uv_systab == EFI_INVALID_TABLE_ADDR) || !efi.uv_systab);
+}
 
 #else	/* X86_UV */
 
@@ -31,6 +36,7 @@ static inline const struct cpumask *
 uv_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm,
 		    unsigned long start, unsigned long end, unsigned int cpu)
 { return cpumask; }
+static inline int is_early_uv_system(void)	{ return 0; }
 
 #endif	/* X86_UV */
 
-- 
2.5.5