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From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: aneesh.kumar@linux.vnet.ibm.com, mpe@ellerman.id.au,
	christophe.leroy@c-s.fr
Subject: [PATCH V4] powerpc/hugetlb: Add ABI defines for supported HugeTLB page sizes
Date: Fri,  7 Apr 2017 09:25:39 +0530	[thread overview]
Message-ID: <20170407035539.21688-1-khandual@linux.vnet.ibm.com> (raw)
In-Reply-To: <5fb76b92-2988-1207-2bed-814a96e6a51a@linux.vnet.ibm.com>

This just adds user space exported ABI definitions for 2MB, 16MB, 1GB,
16GB non default huge page sizes to be used with mmap() system call.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
These defined values will be used along with MAP_HUGETLB while calling
mmap() system call if the desired HugeTLB page size is not the default
one. Follows similar definitions present in x86.

arch/x86/include/uapi/asm/mman.h:#define MAP_HUGE_2MB    (21 << MAP_HUGE_SHIFT)
arch/x86/include/uapi/asm/mman.h:#define MAP_HUGE_1GB    (30 << MAP_HUGE_SHIFT)

Changes in V4:
- Added defines for 512KB and 8MB HugeTLB page sizes per Christophe

Changes in V3:
- Added comment about how these defines will help create 'flags'
  argument for mmap() system call per Balbir

Changes in V2:
- Added definitions for 2MB and 1GB HugeTLB pages per Aneesh

 arch/powerpc/include/uapi/asm/mman.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/powerpc/include/uapi/asm/mman.h b/arch/powerpc/include/uapi/asm/mman.h
index 03c06ba..ebe99c7 100644
--- a/arch/powerpc/include/uapi/asm/mman.h
+++ b/arch/powerpc/include/uapi/asm/mman.h
@@ -29,4 +29,18 @@
 #define MAP_STACK	0x20000		/* give out an address that is best suited for process/thread stacks */
 #define MAP_HUGETLB	0x40000		/* create a huge page mapping */
 
+/*
+ * These constant defines should be used for creating the
+ * 'flags' argument (26:31 bit positions) for mmap() system
+ * call should the caller decide to use non default HugeTLB
+ * page size.
+ */
+#define MAP_HUGE_512KB	(19 << MAP_HUGE_SHIFT)	/* 512KB HugeTLB Page */
+#define MAP_HUGE_1MB	(20 << MAP_HUGE_SHIFT)	/* 1MB   HugeTLB Page */
+#define MAP_HUGE_2MB	(21 << MAP_HUGE_SHIFT)	/* 2MB   HugeTLB Page */
+#define MAP_HUGE_8MB	(23 << MAP_HUGE_SHIFT)	/* 8MB   HugeTLB Page */
+#define MAP_HUGE_16MB	(24 << MAP_HUGE_SHIFT)	/* 16MB  HugeTLB Page */
+#define MAP_HUGE_1GB	(30 << MAP_HUGE_SHIFT)	/* 1GB   HugeTLB Page */
+#define MAP_HUGE_16GB	(34 << MAP_HUGE_SHIFT)	/* 16GB  HugeTLB Page */
+
 #endif /* _UAPI_ASM_POWERPC_MMAN_H */
-- 
1.8.5.2

  reply	other threads:[~2017-04-07  3:56 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-04  6:03 [PATCH] powerpc/hugetlb: Add ABI defines for MAP_HUGE_16MB and MAP_HUGE_16GB Anshuman Khandual
2017-04-04  8:33 ` Aneesh Kumar K.V
2017-04-04 13:50   ` Anshuman Khandual
2017-04-05  5:19     ` [PATCH V2] powerpc/hugetlb: Add ABI defines for supported HugeTLB page sizes Anshuman Khandual
2017-04-05  6:59       ` Balbir Singh
2017-04-05  7:09         ` Michael Ellerman
2017-04-05 11:20           ` [PATCH V3] " Anshuman Khandual
2017-04-06 19:03             ` LEROY Christophe
2017-04-07  3:47               ` Anshuman Khandual
2017-04-07  3:55                 ` Anshuman Khandual [this message]
2017-04-07 13:01                   ` [PATCH V4] " Michael Ellerman
2017-04-07 14:58                     ` Anshuman Khandual
2017-04-07 15:44                     ` Paul Clarke
2017-04-08  9:19                       ` Michael Ellerman
2017-04-10 22:49                   ` [V4] " Michael Ellerman

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