From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org
Cc: linuxppc-dev@lists.ozlabs.org,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH -V7 11/12] arch/powerpc: Add 64TB support
Date: Tue, 4 Sep 2012 14:31:28 +0530 [thread overview]
Message-ID: <1346749289-16986-12-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)
In-Reply-To: <1346749289-16986-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Increase max addressable range to 64TB. This is not tested on
real hardware yet.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/mmu-hash64.h | 42 ++++++++++++++++++++------
arch/powerpc/include/asm/pgtable-ppc64-4k.h | 2 +-
arch/powerpc/include/asm/pgtable-ppc64-64k.h | 2 +-
arch/powerpc/include/asm/processor.h | 4 +--
arch/powerpc/include/asm/sparsemem.h | 4 +--
arch/powerpc/kernel/exceptions-64s.S | 4 ++-
arch/powerpc/mm/slb_low.S | 12 ++++++++
7 files changed, 54 insertions(+), 16 deletions(-)
diff --git a/arch/powerpc/include/asm/mmu-hash64.h b/arch/powerpc/include/asm/mmu-hash64.h
index 8c5c5a4..5c52691 100644
--- a/arch/powerpc/include/asm/mmu-hash64.h
+++ b/arch/powerpc/include/asm/mmu-hash64.h
@@ -374,17 +374,21 @@ extern void slb_set_size(u16 size);
* (head.S) and ASM_VSID_SCRAMBLE (below) are changed accordingly.
*/
-#define VSID_MULTIPLIER_256M ASM_CONST(200730139) /* 28-bit prime */
-#define VSID_BITS_256M 36
+/*
+ * This should be computed such that protovosid * vsid_mulitplier
+ * doesn't overflow 64 bits. It should also be co-prime to vsid_modulus
+ */
+#define VSID_MULTIPLIER_256M ASM_CONST(12538073) /* 24-bit prime */
+#define VSID_BITS_256M 38
#define VSID_MODULUS_256M ((1UL<<VSID_BITS_256M)-1)
#define VSID_MULTIPLIER_1T ASM_CONST(12538073) /* 24-bit prime */
-#define VSID_BITS_1T 24
+#define VSID_BITS_1T 26
#define VSID_MODULUS_1T ((1UL<<VSID_BITS_1T)-1)
#define CONTEXT_BITS 19
-#define USER_ESID_BITS 16
-#define USER_ESID_BITS_1T 4
+#define USER_ESID_BITS 18
+#define USER_ESID_BITS_1T 6
#define USER_VSID_RANGE (1UL << (USER_ESID_BITS + SID_SHIFT))
@@ -507,12 +511,32 @@ typedef struct {
})
#endif /* 1 */
-/* This is only valid for addresses >= PAGE_OFFSET */
+/*
+ * This is only valid for addresses >= PAGE_OFFSET
+ * The proto-VSID space is divided into two class
+ * User: 0 to 2^(CONTEXT_BITS + USER_ESID_BITS) -1
+ * kernel: 2^(CONTEXT_BITS + USER_ESID_BITS) to 2^(VSID_BITS) - 1
+ *
+ * With KERNEL_START at 0xc000000000000000, the proto vsid for
+ * the kernel ends up with 0xc00000000 (36 bits). With 64TB
+ * support we need to have kernel proto-VSID in the
+ * [2^37 to 2^38 - 1] range due to the increased USER_ESID_BITS.
+ */
static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize)
{
- if (ssize == MMU_SEGSIZE_256M)
- return vsid_scramble(ea >> SID_SHIFT, 256M);
- return vsid_scramble(ea >> SID_SHIFT_1T, 1T);
+ unsigned long proto_vsid;
+ /*
+ * We need to make sure proto_vsid for the kernel is
+ * >= 2^(CONTEXT_BITS + USER_ESID_BITS[_1T])
+ */
+ if (ssize == MMU_SEGSIZE_256M) {
+ proto_vsid = ea >> SID_SHIFT;
+ proto_vsid |= (1UL << (CONTEXT_BITS + USER_ESID_BITS));
+ return vsid_scramble(proto_vsid, 256M);
+ }
+ proto_vsid = ea >> SID_SHIFT_1T;
+ proto_vsid |= (1UL << (CONTEXT_BITS + USER_ESID_BITS_1T));
+ return vsid_scramble(proto_vsid, 1T);
}
/* Returns the segment size indicator for a user address */
diff --git a/arch/powerpc/include/asm/pgtable-ppc64-4k.h b/arch/powerpc/include/asm/pgtable-ppc64-4k.h
index 6eefdcf..b3eccf2 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64-4k.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64-4k.h
@@ -7,7 +7,7 @@
*/
#define PTE_INDEX_SIZE 9
#define PMD_INDEX_SIZE 7
-#define PUD_INDEX_SIZE 7
+#define PUD_INDEX_SIZE 9
#define PGD_INDEX_SIZE 9
#ifndef __ASSEMBLY__
diff --git a/arch/powerpc/include/asm/pgtable-ppc64-64k.h b/arch/powerpc/include/asm/pgtable-ppc64-64k.h
index 90533dd..be4e287 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64-64k.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64-64k.h
@@ -7,7 +7,7 @@
#define PTE_INDEX_SIZE 12
#define PMD_INDEX_SIZE 12
#define PUD_INDEX_SIZE 0
-#define PGD_INDEX_SIZE 4
+#define PGD_INDEX_SIZE 6
#ifndef __ASSEMBLY__
#define PTE_TABLE_SIZE (sizeof(real_pte_t) << PTE_INDEX_SIZE)
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 53b6dfa..00bda2f 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -97,8 +97,8 @@ extern struct task_struct *last_task_used_spe;
#endif
#ifdef CONFIG_PPC64
-/* 64-bit user address space is 44-bits (16TB user VM) */
-#define TASK_SIZE_USER64 (0x0000100000000000UL)
+/* 64-bit user address space is 46-bits (64TB user VM) */
+#define TASK_SIZE_USER64 (0x0000400000000000UL)
/*
* 32-bit user address space is 4GB - 1 page
diff --git a/arch/powerpc/include/asm/sparsemem.h b/arch/powerpc/include/asm/sparsemem.h
index 0c5fa31..f6fc0ee 100644
--- a/arch/powerpc/include/asm/sparsemem.h
+++ b/arch/powerpc/include/asm/sparsemem.h
@@ -10,8 +10,8 @@
*/
#define SECTION_SIZE_BITS 24
-#define MAX_PHYSADDR_BITS 44
-#define MAX_PHYSMEM_BITS 44
+#define MAX_PHYSADDR_BITS 46
+#define MAX_PHYSMEM_BITS 46
#endif /* CONFIG_SPARSEMEM */
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index e894515..d980818 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -959,7 +959,9 @@ _GLOBAL(do_stab_bolted)
rldimi r10,r11,7,52 /* r10 = first ste of the group */
/* Calculate VSID */
- /* This is a kernel address, so protovsid = ESID */
+ /* This is a kernel address, so protovsid = ESID | 1 << 37 */
+ li r9,0x1
+ rldimi r11,r9,(CONTEXT_BITS + USER_ESID_BITS),0
ASM_VSID_SCRAMBLE(r11, r9, 256M)
rldic r9,r11,12,16 /* r9 = vsid << 12 */
diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S
index f6a2625..1a16ca2 100644
--- a/arch/powerpc/mm/slb_low.S
+++ b/arch/powerpc/mm/slb_low.S
@@ -56,6 +56,12 @@ _GLOBAL(slb_allocate_realmode)
*/
_GLOBAL(slb_miss_kernel_load_linear)
li r11,0
+ li r9,0x1
+ /*
+ * for 1T we shift 12 bits more. slb_finish_load_1T will do
+ * the necessary adjustment
+ */
+ rldimi r10,r9,(CONTEXT_BITS + USER_ESID_BITS),0
BEGIN_FTR_SECTION
b slb_finish_load
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_1T_SEGMENT)
@@ -85,6 +91,12 @@ _GLOBAL(slb_miss_kernel_load_vmemmap)
_GLOBAL(slb_miss_kernel_load_io)
li r11,0
6:
+ li r9,0x1
+ /*
+ * for 1T we shift 12 bits more. slb_finish_load_1T will do
+ * the necessary adjustment
+ */
+ rldimi r10,r9,(CONTEXT_BITS + USER_ESID_BITS),0
BEGIN_FTR_SECTION
b slb_finish_load
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_1T_SEGMENT)
--
1.7.10
next prev parent reply other threads:[~2012-09-04 9:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 9:01 [PATCH -V7 0/12] arch/powerpc: Add 64TB support to ppc64 Aneesh Kumar K.V
2012-09-04 9:01 ` [PATCH -V7 01/12] arch/powerpc: Replace open coded CONTEXT_BITS value Aneesh Kumar K.V
2012-09-04 9:01 ` [PATCH -V7 02/12] arch/powerpc: Use hpt_va to compute virtual address Aneesh Kumar K.V
2012-09-04 9:01 ` [PATCH -V7 03/12] arch/powerpc: Simplify hpte_decode Aneesh Kumar K.V
2012-09-04 9:01 ` [PATCH -V7 04/12] arch/powerpc: Convert virtual address to vpn Aneesh Kumar K.V
2012-09-05 8:26 ` Paul Mackerras
2012-09-05 14:45 ` Aneesh Kumar K.V
2012-09-06 1:24 ` Paul Mackerras
2012-09-04 9:01 ` [PATCH -V7 05/12] arch/powerpc: Rename va " Aneesh Kumar K.V
2012-09-04 9:01 ` [PATCH -V7 06/12] arch/powerpc: Make KERN_VIRT_SIZE not dependend on PGTABLE_RANGE Aneesh Kumar K.V
2012-09-04 9:01 ` [PATCH -V7 07/12] arch/powerpc: Increase the slice range to 64TB Aneesh Kumar K.V
2012-09-05 23:47 ` Paul Mackerras
2012-09-04 9:01 ` [PATCH -V7 08/12] arch/powerpc: Make some of the PGTABLE_RANGE dependency explicit Aneesh Kumar K.V
2012-09-04 9:01 ` [PATCH -V7 09/12] arch/powerpc: Use the required number of VSID bits in slbmte Aneesh Kumar K.V
2012-09-04 9:01 ` [PATCH -V7 10/12] arch/powerpc: Use 32bit array for slb cache Aneesh Kumar K.V
2012-09-04 9:01 ` Aneesh Kumar K.V [this message]
2012-09-06 1:21 ` [PATCH -V7 11/12] arch/powerpc: Add 64TB support Paul Mackerras
2012-09-04 9:01 ` [PATCH -V7 12/12] arch/powerpc: Update VSID allocation documentation Aneesh Kumar K.V
2012-09-06 1:23 ` Paul Mackerras
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