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authorMike Travis <mike.travis@hpe.com>2018-10-02 21:01:45 +0300
committerThomas Gleixner <tglx@linutronix.de>2018-10-02 22:29:16 +0300
commit20a8378aa9dd108a01cb0e695599f5257a885c4b (patch)
tree8844bde01c32cf4999edfe1d91c43e2bad95ceff /arch/x86/include/asm/uv
parent7c03e7035ac1cf2a6165754e4f3a49c2f1977838 (diff)
downloadlinux-20a8378aa9dd108a01cb0e695599f5257a885c4b.tar.xz
x86/platform/uv: Provide is_early_uv_system()
Introduce is_early_uv_system() which uses efi.uv_systab to decide early in the boot process whether the kernel runs on a UV system. This is needed to skip other early setup/init code that might break the UV platform if done too early such as before necessary ACPI tables parsing takes place. Suggested-by: Hedi Berriche <hedi.berriche@hpe.com> Signed-off-by: Mike Travis <mike.travis@hpe.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Russ Anderson <rja@hpe.com> Reviewed-by: Dimitri Sivanich <sivanich@hpe.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Russ Anderson <russ.anderson@hpe.com> Cc: Dimitri Sivanich <dimitri.sivanich@hpe.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Kate Stewart <kstewart@linuxfoundation.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Pavel Tatashin <pasha.tatashin@oracle.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Len Brown <len.brown@intel.com> Cc: Dou Liyang <douly.fnst@cn.fujitsu.com> Cc: Xiaoming Gao <gxm.linux.kernel@gmail.com> Cc: Rajvi Jingar <rajvi.jingar@intel.com> Link: https://lkml.kernel.org/r/20181002180144.801700401@stormcage.americas.sgi.com
Diffstat (limited to 'arch/x86/include/asm/uv')
-rw-r--r--arch/x86/include/asm/uv/uv.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h
index a80c0673798f..e60c45fd3679 100644
--- a/arch/x86/include/asm/uv/uv.h
+++ b/arch/x86/include/asm/uv/uv.h
@@ -10,8 +10,13 @@ struct cpumask;
struct mm_struct;
#ifdef CONFIG_X86_UV
+#include <linux/efi.h>
extern enum uv_system_type get_uv_system_type(void);
+static inline bool is_early_uv_system(void)
+{
+ return !((efi.uv_systab == EFI_INVALID_TABLE_ADDR) || !efi.uv_systab);
+}
extern int is_uv_system(void);
extern int is_uv_hubless(void);
extern void uv_cpu_init(void);
@@ -23,6 +28,7 @@ extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
#else /* X86_UV */
static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; }
+static inline bool is_early_uv_system(void) { return 0; }
static inline int is_uv_system(void) { return 0; }
static inline int is_uv_hubless(void) { return 0; }
static inline void uv_cpu_init(void) { }