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powerpc/44x: use patch_sites for TLB handlers patching 

Use patch sites and associated helpers to manage TLB handlers
patching instead of hardcoding.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-11-09 17:33:30 +00:00 committed by Michael Ellerman
parent d16952a629
commit 6c16816b91
3 changed files with 11 additions and 17 deletions
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3
arch/powerpc/include/asm/nohash/32/mmu-44x.h
View File

@ -111,6 +111,9 @@ typedef struct {
unsigned long vdso_base;
} mm_context_t;
/* patch sites */
extern s32 patch__tlb_44x_hwater_D, patch__tlb_44x_hwater_I;
#endif /* !__ASSEMBLY__ */
#ifndef CONFIG_PPC_EARLY_DEBUG_44x

11
arch/powerpc/kernel/head_44x.S
View File

@ -40,6 +40,7 @@
#include <asm/ptrace.h>
#include <asm/synch.h>
#include <asm/export.h>
#include <asm/code-patching-asm.h>
#include "head_booke.h"
@ -382,10 +383,9 @@ interrupt_base:
/* Increment, rollover, and store TLB index */
addi r13,r13,1
patch_site 0f, patch__tlb_44x_hwater_D
/* Compare with watermark (instruction gets patched) */
.globl tlb_44x_patch_hwater_D
tlb_44x_patch_hwater_D:
cmpwi 0,r13,1 /* reserve entries */
0: cmpwi 0,r13,1 /* reserve entries */
ble 5f
li r13,0
5:
@ -478,10 +478,9 @@ tlb_44x_patch_hwater_D:
/* Increment, rollover, and store TLB index */
addi r13,r13,1
patch_site 0f, patch__tlb_44x_hwater_I
/* Compare with watermark (instruction gets patched) */
.globl tlb_44x_patch_hwater_I
tlb_44x_patch_hwater_I:
cmpwi 0,r13,1 /* reserve entries */
0: cmpwi 0,r13,1 /* reserve entries */
ble 5f
li r13,0
5:

14
arch/powerpc/mm/44x_mmu.c
View File

@ -29,6 +29,7 @@
#include <asm/mmu.h>
#include <asm/page.h>
#include <asm/cacheflush.h>
#include <asm/code-patching.h>
#include "mmu_decl.h"
@ -43,22 +44,13 @@ unsigned long tlb_47x_boltmap[1024/8];
static void ppc44x_update_tlb_hwater(void)
{
extern unsigned int tlb_44x_patch_hwater_D[];
extern unsigned int tlb_44x_patch_hwater_I[];
/* The TLB miss handlers hard codes the watermark in a cmpli
* instruction to improve performances rather than loading it
* from the global variable. Thus, we patch the instructions
* in the 2 TLB miss handlers when updating the value
*/
tlb_44x_patch_hwater_D[0] = (tlb_44x_patch_hwater_D[0] & 0xffff0000) |
tlb_44x_hwater;
flush_icache_range((unsigned long)&tlb_44x_patch_hwater_D[0],
(unsigned long)&tlb_44x_patch_hwater_D[1]);
tlb_44x_patch_hwater_I[0] = (tlb_44x_patch_hwater_I[0] & 0xffff0000) |
tlb_44x_hwater;
flush_icache_range((unsigned long)&tlb_44x_patch_hwater_I[0],
(unsigned long)&tlb_44x_patch_hwater_I[1]);
modify_instruction_site(&patch__tlb_44x_hwater_D, 0xffff, tlb_44x_hwater);
modify_instruction_site(&patch__tlb_44x_hwater_I, 0xffff, tlb_44x_hwater);
}
/*