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authorDavid S. Miller <davem@sunset.davemloft.net>2006-03-18 23:55:11 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 01:16:41 -0800
commitbb8646d8340fa7c1b66a037428e39f85f8738f0a (patch)
tree931d4505a0ba65124b662f0f8b5935e0b154bd66 /arch
parent88d7079458f87d6f2d2261b2f87b7b9416019f5e (diff)
[SPARC64]: Optimized TSB table initialization.
We only need to write an invalid tag every 16 bytes, so taking advantage of this can save many instructions compared to the simple memset() call we make now. A prefetching implementation is implemented for sun4u and a block-init store version if implemented for Niagara. The next trick is to be able to perform an init and a copy_tsb() in parallel when growing a TSB table. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc64/kernel/tsb.S69
-rw-r--r--arch/sparc64/lib/NGbzero.S1
-rw-r--r--arch/sparc64/mm/tsb.c2
3 files changed, 71 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/tsb.S b/arch/sparc64/kernel/tsb.S
index 1b154c863628..118baea44f69 100644
--- a/arch/sparc64/kernel/tsb.S
+++ b/arch/sparc64/kernel/tsb.S
@@ -371,3 +371,72 @@ copy_tsb: /* %o0=old_tsb_base, %o1=old_tsb_size
retl
TSB_MEMBAR
.size copy_tsb, .-copy_tsb
+
+ /* Set the invalid bit in all TSB entries. */
+ .align 32
+ .globl tsb_init
+ .type tsb_init,#function
+tsb_init: /* %o0 = TSB vaddr, %o1 = size in bytes */
+ prefetch [%o0 + 0x000], #n_writes
+ mov 1, %g1
+ prefetch [%o0 + 0x040], #n_writes
+ sllx %g1, TSB_TAG_INVALID_BIT, %g1
+ prefetch [%o0 + 0x080], #n_writes
+1: prefetch [%o0 + 0x0c0], #n_writes
+ stx %g1, [%o0 + 0x00]
+ stx %g1, [%o0 + 0x10]
+ stx %g1, [%o0 + 0x20]
+ stx %g1, [%o0 + 0x30]
+ prefetch [%o0 + 0x100], #n_writes
+ stx %g1, [%o0 + 0x40]
+ stx %g1, [%o0 + 0x50]
+ stx %g1, [%o0 + 0x60]
+ stx %g1, [%o0 + 0x70]
+ prefetch [%o0 + 0x140], #n_writes
+ stx %g1, [%o0 + 0x80]
+ stx %g1, [%o0 + 0x90]
+ stx %g1, [%o0 + 0xa0]
+ stx %g1, [%o0 + 0xb0]
+ prefetch [%o0 + 0x180], #n_writes
+ stx %g1, [%o0 + 0xc0]
+ stx %g1, [%o0 + 0xd0]
+ stx %g1, [%o0 + 0xe0]
+ stx %g1, [%o0 + 0xf0]
+ subcc %o1, 0x100, %o1
+ bne,pt %xcc, 1b
+ add %o0, 0x100, %o0
+ retl
+ nop
+ nop
+ nop
+ .size tsb_init, .-tsb_init
+
+ .globl NGtsb_init
+ .type NGtsb_init,#function
+NGtsb_init:
+ rd %asi, %g2
+ mov 1, %g1
+ wr %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
+ sllx %g1, TSB_TAG_INVALID_BIT, %g1
+1: stxa %g1, [%o0 + 0x00] %asi
+ stxa %g1, [%o0 + 0x10] %asi
+ stxa %g1, [%o0 + 0x20] %asi
+ stxa %g1, [%o0 + 0x30] %asi
+ stxa %g1, [%o0 + 0x40] %asi
+ stxa %g1, [%o0 + 0x50] %asi
+ stxa %g1, [%o0 + 0x60] %asi
+ stxa %g1, [%o0 + 0x70] %asi
+ stxa %g1, [%o0 + 0x80] %asi
+ stxa %g1, [%o0 + 0x90] %asi
+ stxa %g1, [%o0 + 0xa0] %asi
+ stxa %g1, [%o0 + 0xb0] %asi
+ stxa %g1, [%o0 + 0xc0] %asi
+ stxa %g1, [%o0 + 0xd0] %asi
+ stxa %g1, [%o0 + 0xe0] %asi
+ stxa %g1, [%o0 + 0xf0] %asi
+ subcc %o1, 0x100, %o1
+ bne,pt %xcc, 1b
+ add %o0, 0x100, %o0
+ retl
+ wr %g2, 0x0, %asi
+ .size NGtsb_init, .-NGtsb_init
diff --git a/arch/sparc64/lib/NGbzero.S b/arch/sparc64/lib/NGbzero.S
index fef584f745dc..e86baece5cc8 100644
--- a/arch/sparc64/lib/NGbzero.S
+++ b/arch/sparc64/lib/NGbzero.S
@@ -157,6 +157,7 @@ niagara_patch_bzero:
NG_DO_PATCH(memset, NGmemset)
NG_DO_PATCH(__bzero, NGbzero)
NG_DO_PATCH(__clear_user, NGclear_user)
+ NG_DO_PATCH(tsb_init, NGtsb_init)
retl
nop
.size niagara_patch_bzero,.-niagara_patch_bzero
diff --git a/arch/sparc64/mm/tsb.c b/arch/sparc64/mm/tsb.c
index 1af797a0a092..b2064e2a44d6 100644
--- a/arch/sparc64/mm/tsb.c
+++ b/arch/sparc64/mm/tsb.c
@@ -313,7 +313,7 @@ retry_tsb_alloc:
}
/* Mark all tags as invalid. */
- memset(new_tsb, 0x40, new_size);
+ tsb_init(new_tsb, new_size);
/* Ok, we are about to commit the changes. If we are
* growing an existing TSB the locking is very tricky,