From: Robin Holt <holt@sgi.com>
Date: Wed, 16 Dec 2009 00:47:54 +0000 (-0800)
Subject: x86: uv: introduce uv_gpa_is_mmr
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fae419f2abd15ab7d1cd1413e6683a276a4e14e2;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

x86: uv: introduce uv_gpa_is_mmr

Provide a mechanism for determining if a global physical address is
pointing to a UV hub MMR.

Signed-off-by: Robin Holt <holt@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h
index 0cc955f16ae..8f1332bbfd7 100644
--- a/arch/x86/include/asm/uv/uv_hub.h
+++ b/arch/x86/include/asm/uv/uv_hub.h
@@ -232,6 +232,13 @@ static inline unsigned long uv_gpa(void *v)
 	return uv_soc_phys_ram_to_gpa(__pa(v));
 }
 
+/* Top two bits indicate the requested address is in MMR space.  */
+static inline int
+uv_gpa_in_mmr_space(unsigned long gpa)
+{
+	return (gpa >> 62) == 0x3UL;
+}
+
 /* UV global physical address --> socket phys RAM */
 static inline unsigned long uv_gpa_to_soc_phys_ram(unsigned long gpa)
 {