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[POWERPC] vdso: Fixes for cache block sizes

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The current VDSO implementation is hardcoded to 128 byte cache blocks,
which are only used on IBM's 64-bit processors.

Convert it to get the cache block sizes out of vdso_data instead,
similar to how the ppc64 in-kernel cache flush does it.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olof Johansson 2007-11-20 12:24:45 +11:00 committed by Paul Mackerras
parent 92e21e79a8
commit fbe481756d
5 changed files with 81 additions and 24 deletions
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4
arch/powerpc/kernel/asm-offsets.c
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@ -284,6 +284,10 @@ int main(void)
DEFINE(CFG_SYSCALL_MAP32, offsetof(struct vdso_data, syscall_map_32));
DEFINE(WTOM_CLOCK_SEC, offsetof(struct vdso_data, wtom_clock_sec));
DEFINE(WTOM_CLOCK_NSEC, offsetof(struct vdso_data, wtom_clock_nsec));
DEFINE(CFG_ICACHE_BLOCKSZ, offsetof(struct vdso_data, icache_block_size));
DEFINE(CFG_DCACHE_BLOCKSZ, offsetof(struct vdso_data, dcache_block_size));
DEFINE(CFG_ICACHE_LOGBLOCKSZ, offsetof(struct vdso_data, icache_log_block_size));
DEFINE(CFG_DCACHE_LOGBLOCKSZ, offsetof(struct vdso_data, dcache_log_block_size));
#ifdef CONFIG_PPC64
DEFINE(CFG_SYSCALL_MAP64, offsetof(struct vdso_data, syscall_map_64));
DEFINE(TVAL64_TV_SEC, offsetof(struct timeval, tv_sec));

11
arch/powerpc/kernel/vdso.c
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@ -699,11 +699,22 @@ static int __init vdso_init(void)
vdso_data->icache_size = ppc64_caches.isize;
vdso_data->icache_line_size = ppc64_caches.iline_size;
/* XXXOJN: Blocks should be added to ppc64_caches and used instead */
vdso_data->dcache_block_size = ppc64_caches.dline_size;
vdso_data->icache_block_size = ppc64_caches.iline_size;
vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size;
vdso_data->icache_log_block_size = ppc64_caches.log_iline_size;
/*
* Calculate the size of the 64 bits vDSO
*/
vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
#else
vdso_data->dcache_block_size = L1_CACHE_BYTES;
vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
vdso_data->icache_block_size = L1_CACHE_BYTES;
vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
#endif /* CONFIG_PPC64 */

41
arch/powerpc/kernel/vdso32/cacheflush.S
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@ -23,29 +23,46 @@
*
* Flushes the data cache & invalidate the instruction cache for the
* provided range [start, end[
*
* Note: all CPUs supported by this kernel have a 128 bytes cache
* line size so we don't have to peek that info from the datapage
*/
V_FUNCTION_BEGIN(__kernel_sync_dicache)
.cfi_startproc
li r5,127
andc r6,r3,r5 /* round low to line bdy */
mflr r12
.cfi_register lr,r12
mr r11,r3
bl __get_datapage@local
mtlr r12
mr r10,r3
lwz r7,CFG_DCACHE_BLOCKSZ(r10)
addi r5,r7,-1
andc r6,r11,r5 /* round low to line bdy */
subf r8,r6,r4 /* compute length */
add r8,r8,r5 /* ensure we get enough */
srwi. r8,r8,7 /* compute line count */
lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10)
srw. r8,r8,r9 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
mr r3,r6
1: dcbst 0,r3
addi r3,r3,128
1: dcbst 0,r6
add r6,r6,r7
bdnz 1b
sync
/* Now invalidate the instruction cache */
lwz r7,CFG_ICACHE_BLOCKSZ(r10)
addi r5,r7,-1
andc r6,r11,r5 /* round low to line bdy */
subf r8,r6,r4 /* compute length */
add r8,r8,r5
lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10)
srw. r8,r8,r9 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
1: icbi 0,r6
addi r6,r6,128
bdnz 1b
2: icbi 0,r6
add r6,r6,r7
bdnz 2b
isync
li r3,0
blr

41
arch/powerpc/kernel/vdso64/cacheflush.S
View File

@ -23,29 +23,46 @@
*
* Flushes the data cache & invalidate the instruction cache for the
* provided range [start, end[
*
* Note: all CPUs supported by this kernel have a 128 bytes cache
* line size so we don't have to peek that info from the datapage
*/
V_FUNCTION_BEGIN(__kernel_sync_dicache)
.cfi_startproc
li r5,127
andc r6,r3,r5 /* round low to line bdy */
mflr r12
.cfi_register lr,r12
mr r11,r3
bl V_LOCAL_FUNC(__get_datapage)
mtlr r12
mr r10,r3
lwz r7,CFG_DCACHE_BLOCKSZ(r10)
addi r5,r7,-1
andc r6,r11,r5 /* round low to line bdy */
subf r8,r6,r4 /* compute length */
add r8,r8,r5 /* ensure we get enough */
srwi. r8,r8,7 /* compute line count */
lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10)
srw. r8,r8,r9 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
mr r3,r6
1: dcbst 0,r3
addi r3,r3,128
1: dcbst 0,r6
add r6,r6,r7
bdnz 1b
sync
/* Now invalidate the instruction cache */
lwz r7,CFG_ICACHE_BLOCKSZ(r10)
addi r5,r7,-1
andc r6,r11,r5 /* round low to line bdy */
subf r8,r6,r4 /* compute length */
add r8,r8,r5
lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10)
srw. r8,r8,r9 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
1: icbi 0,r6
addi r6,r6,128
bdnz 1b
2: icbi 0,r6
add r6,r6,r7
bdnz 2b
isync
li r3,0
blr

8
include/asm-powerpc/vdso_datapage.h
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@ -77,6 +77,10 @@ struct vdso_data {
/* those additional ones don't have to be located anywhere
* special as they were not part of the original systemcfg
*/
__u32 dcache_block_size; /* L1 d-cache block size */
__u32 icache_block_size; /* L1 i-cache block size */
__u32 dcache_log_block_size; /* L1 d-cache log block size */
__u32 icache_log_block_size; /* L1 i-cache log block size */
__s32 wtom_clock_sec; /* Wall to monotonic clock */
__s32 wtom_clock_nsec;
__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */
@ -99,6 +103,10 @@ struct vdso_data {
__s32 wtom_clock_sec; /* Wall to monotonic clock */
__s32 wtom_clock_nsec;
__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
__u32 dcache_block_size; /* L1 d-cache block size */
__u32 icache_block_size; /* L1 i-cache block size */
__u32 dcache_log_block_size; /* L1 d-cache log block size */
__u32 icache_log_block_size; /* L1 i-cache log block size */
};
#endif /* CONFIG_PPC64 */