[PATCH 5/9] powerpc/book3s/32: Use patch_site to patch hash functions
From: Christophe Leroy
Date: Fri Nov 09 2018 - 12:33:29 EST
Use patch_sites and the new modify_instruction_site() function
instead of hardcoding hash functions patching.
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
---
arch/powerpc/include/asm/book3s/32/mmu-hash.h | 6 +++++
arch/powerpc/mm/hash_low_32.S | 33 ++++++++++++++-----------
arch/powerpc/mm/ppc_mmu_32.c | 35 ++++++++-------------------
3 files changed, 35 insertions(+), 39 deletions(-)
diff --git a/arch/powerpc/include/asm/book3s/32/mmu-hash.h b/arch/powerpc/include/asm/book3s/32/mmu-hash.h
index e38c91388c40..9662a44c5639 100644
--- a/arch/powerpc/include/asm/book3s/32/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/32/mmu-hash.h
@@ -83,6 +83,12 @@ typedef struct {
unsigned long vdso_base;
} mm_context_t;
+/* patch sites */
+extern s32 patch__hash_page_A0, patch__hash_page_A1, patch__hash_page_A2;
+extern s32 patch__hash_page_B, patch__hash_page_C;
+extern s32 patch__flush_hash_A0, patch__flush_hash_A1, patch__flush_hash_A2;
+extern s32 patch__flush_hash_B;
+
#endif /* !__ASSEMBLY__ */
/* We happily ignore the smaller BATs on 601, we don't actually use
diff --git a/arch/powerpc/mm/hash_low_32.S b/arch/powerpc/mm/hash_low_32.S
index 26acf6c8c20c..1e2df3e9f9ea 100644
--- a/arch/powerpc/mm/hash_low_32.S
+++ b/arch/powerpc/mm/hash_low_32.S
@@ -28,6 +28,7 @@
#include <asm/asm-offsets.h>
#include <asm/export.h>
#include <asm/feature-fixups.h>
+#include <asm/code-patching-asm.h>
#ifdef CONFIG_SMP
.section .bss
@@ -337,11 +338,13 @@ END_FTR_SECTION_IFCLR(CPU_FTR_NEED_COHERENT)
rlwimi r5,r4,10,26,31 /* put in API (abbrev page index) */
SET_V(r5) /* set V (valid) bit */
+ patch_site 0f, patch__hash_page_A0
+ patch_site 1f, patch__hash_page_A1
+ patch_site 2f, patch__hash_page_A2
/* Get the address of the primary PTE group in the hash table (r3) */
-_GLOBAL(hash_page_patch_A)
- addis r0,r7,Hash_base@h /* base address of hash table */
- rlwimi r0,r3,LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* VSID -> hash */
- rlwinm r3,r4,20+LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* PI -> hash */
+0: addis r0,r7,Hash_base@h /* base address of hash table */
+1: rlwimi r0,r3,LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* VSID -> hash */
+2: rlwinm r3,r4,20+LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* PI -> hash */
xor r3,r3,r0 /* make primary hash */
li r0,8 /* PTEs/group */
@@ -366,10 +369,10 @@ _GLOBAL(hash_page_patch_A)
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
beq+ found_slot
+ patch_site 0f, patch__hash_page_B
/* Search the secondary PTEG for a matching PTE */
ori r5,r5,PTE_H /* set H (secondary hash) bit */
-_GLOBAL(hash_page_patch_B)
- xoris r4,r3,Hash_msk>>16 /* compute secondary hash */
+0: xoris r4,r3,Hash_msk>>16 /* compute secondary hash */
xori r4,r4,(-PTEG_SIZE & 0xffff)
addi r4,r4,-HPTE_SIZE
mtctr r0
@@ -393,10 +396,10 @@ _GLOBAL(hash_page_patch_B)
addi r6,r6,1
stw r6,primary_pteg_full@l(r4)
+ patch_site 0f, patch__hash_page_C
/* Search the secondary PTEG for an empty slot */
ori r5,r5,PTE_H /* set H (secondary hash) bit */
-_GLOBAL(hash_page_patch_C)
- xoris r4,r3,Hash_msk>>16 /* compute secondary hash */
+0: xoris r4,r3,Hash_msk>>16 /* compute secondary hash */
xori r4,r4,(-PTEG_SIZE & 0xffff)
addi r4,r4,-HPTE_SIZE
mtctr r0
@@ -577,11 +580,13 @@ _GLOBAL(flush_hash_pages)
stwcx. r8,0,r5 /* update the pte */
bne- 33b
+ patch_site 0f, patch__flush_hash_A0
+ patch_site 1f, patch__flush_hash_A1
+ patch_site 2f, patch__flush_hash_A2
/* Get the address of the primary PTE group in the hash table (r3) */
-_GLOBAL(flush_hash_patch_A)
- addis r8,r7,Hash_base@h /* base address of hash table */
- rlwimi r8,r3,LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* VSID -> hash */
- rlwinm r0,r4,20+LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* PI -> hash */
+0: addis r8,r7,Hash_base@h /* base address of hash table */
+1: rlwimi r8,r3,LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* VSID -> hash */
+2: rlwinm r0,r4,20+LG_PTEG_SIZE,HASH_LEFT,HASH_RIGHT /* PI -> hash */
xor r8,r0,r8 /* make primary hash */
/* Search the primary PTEG for a PTE whose 1st (d)word matches r5 */
@@ -593,11 +598,11 @@ _GLOBAL(flush_hash_patch_A)
bdnzf 2,1b /* loop while ctr != 0 && !cr0.eq */
beq+ 3f
+ patch_site 0f, patch__flush_hash_B
/* Search the secondary PTEG for a matching PTE */
ori r11,r11,PTE_H /* set H (secondary hash) bit */
li r0,8 /* PTEs/group */
-_GLOBAL(flush_hash_patch_B)
- xoris r12,r8,Hash_msk>>16 /* compute secondary hash */
+0: xoris r12,r8,Hash_msk>>16 /* compute secondary hash */
xori r12,r12,(-PTEG_SIZE & 0xffff)
addi r12,r12,-HPTE_SIZE
mtctr r0
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index 3c7c73defcb6..cc4b81331167 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -31,6 +31,7 @@
#include <asm/prom.h>
#include <asm/mmu.h>
#include <asm/machdep.h>
+#include <asm/code-patching.h>
#include "mmu_decl.h"
@@ -182,10 +183,6 @@ void __init MMU_init_hw(void)
unsigned int hmask, mb, mb2;
unsigned int n_hpteg, lg_n_hpteg;
- extern unsigned int hash_page_patch_A[];
- extern unsigned int hash_page_patch_B[], hash_page_patch_C[];
- extern unsigned int flush_hash_patch_A[], flush_hash_patch_B[];
-
if (!mmu_has_feature(MMU_FTR_HPTE_TABLE))
return;
@@ -234,31 +231,19 @@ void __init MMU_init_hw(void)
if (lg_n_hpteg > 16)
mb2 = 16 - LG_HPTEG_SIZE;
- hash_page_patch_A[0] = (hash_page_patch_A[0] & ~0xffff)
- | ((unsigned int)(Hash) >> 16);
- hash_page_patch_A[1] = (hash_page_patch_A[1] & ~0x7c0) | (mb << 6);
- hash_page_patch_A[2] = (hash_page_patch_A[2] & ~0x7c0) | (mb2 << 6);
- hash_page_patch_B[0] = (hash_page_patch_B[0] & ~0xffff) | hmask;
- hash_page_patch_C[0] = (hash_page_patch_C[0] & ~0xffff) | hmask;
-
- /*
- * Ensure that the locations we've patched have been written
- * out from the data cache and invalidated in the instruction
- * cache, on those machines with split caches.
- */
- flush_icache_range((unsigned long) &hash_page_patch_A[0],
- (unsigned long) &hash_page_patch_C[1]);
+ modify_instruction_site(&patch__hash_page_A0, 0xffff, (unsigned int)Hash >> 16);
+ modify_instruction_site(&patch__hash_page_A1, 0x7c0, mb << 6);
+ modify_instruction_site(&patch__hash_page_A2, 0x7c0, mb2 << 6);
+ modify_instruction_site(&patch__hash_page_B, 0xffff, hmask);
+ modify_instruction_site(&patch__hash_page_C, 0xffff, hmask);
/*
* Patch up the instructions in hashtable.S:flush_hash_page
*/
- flush_hash_patch_A[0] = (flush_hash_patch_A[0] & ~0xffff)
- | ((unsigned int)(Hash) >> 16);
- flush_hash_patch_A[1] = (flush_hash_patch_A[1] & ~0x7c0) | (mb << 6);
- flush_hash_patch_A[2] = (flush_hash_patch_A[2] & ~0x7c0) | (mb2 << 6);
- flush_hash_patch_B[0] = (flush_hash_patch_B[0] & ~0xffff) | hmask;
- flush_icache_range((unsigned long) &flush_hash_patch_A[0],
- (unsigned long) &flush_hash_patch_B[1]);
+ modify_instruction_site(&patch__flush_hash_A0, 0xffff, (unsigned int)Hash >> 16);
+ modify_instruction_site(&patch__flush_hash_A1, 0x7c0, mb << 6);
+ modify_instruction_site(&patch__flush_hash_A2, 0x7c0, mb2 << 6);
+ modify_instruction_site(&patch__flush_hash_B, 0xffff, hmask);
if ( ppc_md.progress ) ppc_md.progress("hash:done", 0x205);
}
--
2.13.3