* [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
@ 2014-12-16 15:03 ` Christophe Leroy
0 siblings, 0 replies; 12+ messages in thread
From: Christophe Leroy @ 2014-12-16 15:03 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, scottwood
Cc: linux-kernel, linuxppc-dev, Joakim Tjernlund
All accessed to PGD entries are done via 0(r11).
By using lower part of swapper_pg_dir as load index to r11, we can remove the
ori instruction.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index ae05f28..aa45225 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -322,13 +322,12 @@ InstructionTLBMiss:
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
#ifdef CONFIG_MODULES
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
#endif
/* Insert level 1 index */
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* Load the MI_TWC with the attributes for this "segment." */
MTSPR_CPU6(SPRN_MI_TWC, r11, r3) /* Set segment attributes */
@@ -376,12 +375,11 @@ DataStoreTLBMiss:
andis. r11, r10, 0x8000
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
/* Insert level 1 index */
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* We have a pte table, so load fetch the pte from the table.
*/
@@ -510,12 +508,11 @@ FixupDAR:/* Entry point for dcbx workaround. */
mfspr r10, SPRN_SRR0
andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
- beq- 3f /* Branch if user space */
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ beq 3f
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
/* Insert level 1 index */
3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
rlwinm r11, r11,0,0,19 /* Extract page descriptor page address */
/* Insert level 2 index */
rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
@@ -670,8 +667,7 @@ start_here:
* init's THREAD like the context switch code does, but this is
* easier......until someone changes init's static structures.
*/
- lis r6, swapper_pg_dir@h
- ori r6, r6, swapper_pg_dir@l
+ lis r6, swapper_pg_dir@ha
tophys(r6,r6)
#ifdef CONFIG_8xx_CPU6
lis r4, cpu6_errata_word@h
@@ -850,6 +846,8 @@ _GLOBAL(set_context)
stw r4, 0x4(r5)
#endif
+ li r5, (swapper_pg_dir-PAGE_OFFSET)@l
+ sub r4, r4, r5
#ifdef CONFIG_8xx_CPU6
lis r6, cpu6_errata_word@h
ori r6, r6, cpu6_errata_word@l
--
2.1.0
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
@ 2014-12-16 15:03 ` Christophe Leroy
0 siblings, 0 replies; 12+ messages in thread
From: Christophe Leroy @ 2014-12-16 15:03 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, scottwood
Cc: linuxppc-dev, linux-kernel
All accessed to PGD entries are done via 0(r11).
By using lower part of swapper_pg_dir as load index to r11, we can remove the
ori instruction.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index ae05f28..aa45225 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -322,13 +322,12 @@ InstructionTLBMiss:
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
#ifdef CONFIG_MODULES
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
#endif
/* Insert level 1 index */
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* Load the MI_TWC with the attributes for this "segment." */
MTSPR_CPU6(SPRN_MI_TWC, r11, r3) /* Set segment attributes */
@@ -376,12 +375,11 @@ DataStoreTLBMiss:
andis. r11, r10, 0x8000
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
/* Insert level 1 index */
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* We have a pte table, so load fetch the pte from the table.
*/
@@ -510,12 +508,11 @@ FixupDAR:/* Entry point for dcbx workaround. */
mfspr r10, SPRN_SRR0
andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
- beq- 3f /* Branch if user space */
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ beq 3f
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
/* Insert level 1 index */
3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
rlwinm r11, r11,0,0,19 /* Extract page descriptor page address */
/* Insert level 2 index */
rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
@@ -670,8 +667,7 @@ start_here:
* init's THREAD like the context switch code does, but this is
* easier......until someone changes init's static structures.
*/
- lis r6, swapper_pg_dir@h
- ori r6, r6, swapper_pg_dir@l
+ lis r6, swapper_pg_dir@ha
tophys(r6,r6)
#ifdef CONFIG_8xx_CPU6
lis r4, cpu6_errata_word@h
@@ -850,6 +846,8 @@ _GLOBAL(set_context)
stw r4, 0x4(r5)
#endif
+ li r5, (swapper_pg_dir-PAGE_OFFSET)@l
+ sub r4, r4, r5
#ifdef CONFIG_8xx_CPU6
lis r6, cpu6_errata_word@h
ori r6, r6, cpu6_errata_word@l
--
2.1.0
^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
2014-12-16 15:03 ` Christophe Leroy
@ 2015-01-05 18:33 ` Joakim Tjernlund
-1 siblings, 0 replies; 12+ messages in thread
From: Joakim Tjernlund @ 2015-01-05 18:33 UTC (permalink / raw)
To: christophe.leroy; +Cc: scottwood, paulus, mpe, benh, linux-kernel, linuxppc-dev
On Tue, 2014-12-16 at 16:03 +0100, Christophe Leroy wrote:
> All accessed to PGD entries are done via 0(r11).
> By using lower part of swapper_pg_dir as load index to r11, we can remove the
> ori instruction.
>
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Nice :)
Acked-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
>
> ---
> arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
> 1 file changed, 10 insertions(+), 12 deletions(-)
>
> diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
> index ae05f28..aa45225 100644
> --- a/arch/powerpc/kernel/head_8xx.S
> +++ b/arch/powerpc/kernel/head_8xx.S
> @@ -322,13 +322,12 @@ InstructionTLBMiss:
> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> #ifdef CONFIG_MODULES
> beq 3f
> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> 3:
> #endif
> /* Insert level 1 index */
> rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
> - lwz r11, 0(r11)/* Get the level 1 entry */
> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level 1 entry */
>
> /* Load the MI_TWC with the attributes for this "segment." */
> MTSPR_CPU6(SPRN_MI_TWC, r11, r3)/* Set segment attributes */
> @@ -376,12 +375,11 @@ DataStoreTLBMiss:
> andis. r11, r10, 0x8000
> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> beq 3f
> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> 3:
> /* Insert level 1 index */
> rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
> - lwz r11, 0(r11)/* Get the level 1 entry */
> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level 1 entry */
>
> /* We have a pte table, so load fetch the pte from the table.
> */
> @@ -510,12 +508,11 @@ FixupDAR:/* Entry point for dcbx workaround. */
> mfspr r10, SPRN_SRR0
> andis. r11, r10, 0x8000/* Address >= 0x80000000 */
> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> - beq- 3f /* Branch if user space */
> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> + beq 3f
> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> /* Insert level 1 index */
> 3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
> - lwz r11, 0(r11)/* Get the level 1 entry */
> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level 1 entry */
> rlwinm r11, r11,0,0,19/* Extract page descriptor page address */
> /* Insert level 2 index */
> rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
> @@ -670,8 +667,7 @@ start_here:
> * init's THREAD like the context switch code does, but this is
> * easier......until someone changes init's static structures.
> */
> - lis r6, swapper_pg_dir@h
> - ori r6, r6, swapper_pg_dir@l
> + lis r6, swapper_pg_dir@ha
> tophys(r6,r6)
> #ifdef CONFIG_8xx_CPU6
> lis r4, cpu6_errata_word@h
> @@ -850,6 +846,8 @@ _GLOBAL(set_context)
> stw r4, 0x4(r5)
> #endif
>
> + li r5, (swapper_pg_dir-PAGE_OFFSET)@l
> + sub r4, r4, r5
> #ifdef CONFIG_8xx_CPU6
> lis r6, cpu6_errata_word@h
> ori r6, r6, cpu6_errata_word@l
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
@ 2015-01-05 18:33 ` Joakim Tjernlund
0 siblings, 0 replies; 12+ messages in thread
From: Joakim Tjernlund @ 2015-01-05 18:33 UTC (permalink / raw)
To: christophe.leroy; +Cc: linux-kernel, paulus, scottwood, linuxppc-dev
On Tue, 2014-12-16 at 16:03 +0100, Christophe Leroy wrote:
> All accessed to PGD entries are done via 0(r11).
> By using lower part of swapper_pg_dir as load index to r11, we can remove=
the
> ori instruction.
>=20
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Nice :)
Acked-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
>=20
> ---
> arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
> 1 file changed, 10 insertions(+), 12 deletions(-)
>=20
> diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8x=
x.S
> index ae05f28..aa45225 100644
> --- a/arch/powerpc/kernel/head_8xx.S
> +++ b/arch/powerpc/kernel/head_8xx.S
> @@ -322,13 +322,12 @@ InstructionTLBMiss:
> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> #ifdef CONFIG_MODULES
> beq 3f
> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> 3:
> #endif
> /* Insert level 1 index */
> rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) =
<< 1, 29
> - lwz r11, 0(r11)/* Get the level 1 entry */
> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level =
1 entry */
> =20
> /* Load the MI_TWC with the attributes for this "segment." */
> MTSPR_CPU6(SPRN_MI_TWC, r11, r3)/* Set segment attributes */
> @@ -376,12 +375,11 @@ DataStoreTLBMiss:
> andis. r11, r10, 0x8000
> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> beq 3f
> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> 3:
> /* Insert level 1 index */
> rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) =
<< 1, 29
> - lwz r11, 0(r11)/* Get the level 1 entry */
> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level =
1 entry */
> =20
> /* We have a pte table, so load fetch the pte from the table.
> */
> @@ -510,12 +508,11 @@ FixupDAR:/* Entry point for dcbx workaround. */
> mfspr r10, SPRN_SRR0
> andis. r11, r10, 0x8000/* Address >=3D 0x80000000 */
> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> - beq- 3f /* Branch if user space */
> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> + beq 3f
> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> /* Insert level 1 index */
> 3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) =
<< 1, 29
> - lwz r11, 0(r11)/* Get the level 1 entry */
> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level =
1 entry */
> rlwinm r11, r11,0,0,19/* Extract page descriptor page address */
> /* Insert level 2 index */
> rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
> @@ -670,8 +667,7 @@ start_here:
> * init's THREAD like the context switch code does, but th=
is is
> * easier......until someone changes init's static structu=
res.
> */
> - lis r6, swapper_pg_dir@h
> - ori r6, r6, swapper_pg_dir@l
> + lis r6, swapper_pg_dir@ha
> tophys(r6,r6)
> #ifdef CONFIG_8xx_CPU6
> lis r4, cpu6_errata_word@h
> @@ -850,6 +846,8 @@ _GLOBAL(set_context)
> stw r4, 0x4(r5)
> #endif
> =20
> + li r5, (swapper_pg_dir-PAGE_OFFSET)@l
> + sub r4, r4, r5
> #ifdef CONFIG_8xx_CPU6
> lis r6, cpu6_errata_word@h
> ori r6, r6, cpu6_errata_word@l=
^ permalink raw reply [flat|nested] 12+ messages in thread
* RE: [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
2015-01-05 18:33 ` Joakim Tjernlund
@ 2015-01-06 12:08 ` David Laight
-1 siblings, 0 replies; 12+ messages in thread
From: David Laight @ 2015-01-06 12:08 UTC (permalink / raw)
To: 'Joakim Tjernlund', christophe.leroy
Cc: linux-kernel, paulus, scottwood, linuxppc-dev
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="utf-8", Size: 1584 bytes --]
> On Tue, 2014-12-16 at 16:03 +0100, Christophe Leroy wrote:
> > All accessed to PGD entries are done via 0(r11).
> > By using lower part of swapper_pg_dir as load index to r11, we can remove the
> > ori instruction.
> >
> > Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
>
> Nice :)
> Acked-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
>
> >
> > ---
> > arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
> > 1 file changed, 10 insertions(+), 12 deletions(-)
> >
> > diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
> > index ae05f28..aa45225 100644
> > --- a/arch/powerpc/kernel/head_8xx.S
> > +++ b/arch/powerpc/kernel/head_8xx.S
> > @@ -322,13 +322,12 @@ InstructionTLBMiss:
> > mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> > #ifdef CONFIG_MODULES
> > beq 3f
> > - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> > - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> > + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> > 3:
> > #endif
> > /* Insert level 1 index */
> > rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
> > - lwz r11, 0(r11)/* Get the level 1 entry */
> > + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level 1 entry */
> >
On the face of it that fragment doesn't look right when CONFIG_MODULES is undefined.
David
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^ permalink raw reply [flat|nested] 12+ messages in thread* RE: [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
@ 2015-01-06 12:08 ` David Laight
0 siblings, 0 replies; 12+ messages in thread
From: David Laight @ 2015-01-06 12:08 UTC (permalink / raw)
To: 'Joakim Tjernlund', christophe.leroy
Cc: scottwood, linuxppc-dev, paulus, linux-kernel
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^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
2015-01-06 12:08 ` David Laight
@ 2015-01-06 13:27 ` leroy christophe
-1 siblings, 0 replies; 12+ messages in thread
From: leroy christophe @ 2015-01-06 13:27 UTC (permalink / raw)
To: David Laight, 'Joakim Tjernlund'
Cc: linux-kernel, paulus, scottwood, linuxppc-dev
Le 06/01/2015 13:08, David Laight a écrit :
>> On Tue, 2014-12-16 at 16:03 +0100, Christophe Leroy wrote:
>>> All accessed to PGD entries are done via 0(r11).
>>> By using lower part of swapper_pg_dir as load index to r11, we can remove the
>>> ori instruction.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
>> Nice :)
>> Acked-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
>>
>>> ---
>>> arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
>>> 1 file changed, 10 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
>>> index ae05f28..aa45225 100644
>>> --- a/arch/powerpc/kernel/head_8xx.S
>>> +++ b/arch/powerpc/kernel/head_8xx.S
>>> @@ -322,13 +322,12 @@ InstructionTLBMiss:
>>> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
>>> #ifdef CONFIG_MODULES
>>> beq 3f
>>> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
>>> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
>>> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
>>> 3:
>>> #endif
>>> /* Insert level 1 index */
>>> rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
>>> - lwz r11, 0(r11)/* Get the level 1 entry */
>>> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level 1 entry */
>>>
> On the face of it that fragment doesn't look right when CONFIG_MODULES is undefined.
>
> David
>
I'm not sure I understand what you mean.
The other part of the patch adds the following:
+ li r5, (swapper_pg_dir-PAGE_OFFSET)@l
+ sub r4, r4, r5
r4 is the value put into SPRN_M_TW, so I don't see what may be wrong.
Christophe
^ permalink raw reply [flat|nested] 12+ messages in thread
* Re: [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
@ 2015-01-06 13:27 ` leroy christophe
0 siblings, 0 replies; 12+ messages in thread
From: leroy christophe @ 2015-01-06 13:27 UTC (permalink / raw)
To: David Laight, 'Joakim Tjernlund'
Cc: scottwood, linuxppc-dev, paulus, linux-kernel
Le 06/01/2015 13:08, David Laight a écrit :
>> On Tue, 2014-12-16 at 16:03 +0100, Christophe Leroy wrote:
>>> All accessed to PGD entries are done via 0(r11).
>>> By using lower part of swapper_pg_dir as load index to r11, we can remove the
>>> ori instruction.
>>>
>>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
>> Nice :)
>> Acked-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
>>
>>> ---
>>> arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
>>> 1 file changed, 10 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
>>> index ae05f28..aa45225 100644
>>> --- a/arch/powerpc/kernel/head_8xx.S
>>> +++ b/arch/powerpc/kernel/head_8xx.S
>>> @@ -322,13 +322,12 @@ InstructionTLBMiss:
>>> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
>>> #ifdef CONFIG_MODULES
>>> beq 3f
>>> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
>>> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
>>> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
>>> 3:
>>> #endif
>>> /* Insert level 1 index */
>>> rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
>>> - lwz r11, 0(r11)/* Get the level 1 entry */
>>> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level 1 entry */
>>>
> On the face of it that fragment doesn't look right when CONFIG_MODULES is undefined.
>
> David
>
I'm not sure I understand what you mean.
The other part of the patch adds the following:
+ li r5, (swapper_pg_dir-PAGE_OFFSET)@l
+ sub r4, r4, r5
r4 is the value put into SPRN_M_TW, so I don't see what may be wrong.
Christophe
^ permalink raw reply [flat|nested] 12+ messages in thread
* RE: [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
2015-01-06 13:27 ` leroy christophe
@ 2015-01-06 14:41 ` David Laight
-1 siblings, 0 replies; 12+ messages in thread
From: David Laight @ 2015-01-06 14:41 UTC (permalink / raw)
To: 'leroy christophe', 'Joakim Tjernlund'
Cc: linux-kernel, paulus, scottwood, linuxppc-dev
From: leroy christophe
> Le 06/01/2015 13:08, David Laight a écrit :
> >> On Tue, 2014-12-16 at 16:03 +0100, Christophe Leroy wrote:
> >>> All accessed to PGD entries are done via 0(r11).
> >>> By using lower part of swapper_pg_dir as load index to r11, we can remove the
> >>> ori instruction.
> >>>
> >>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> >> Nice :)
> >> Acked-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
> >>
> >>> ---
> >>> arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
> >>> 1 file changed, 10 insertions(+), 12 deletions(-)
> >>>
> >>> diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
> >>> index ae05f28..aa45225 100644
> >>> --- a/arch/powerpc/kernel/head_8xx.S
> >>> +++ b/arch/powerpc/kernel/head_8xx.S
> >>> @@ -322,13 +322,12 @@ InstructionTLBMiss:
> >>> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> >>> #ifdef CONFIG_MODULES
> >>> beq 3f
> >>> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> >>> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> >>> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> >>> 3:
> >>> #endif
> >>> /* Insert level 1 index */
> >>> rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
> >>> - lwz r11, 0(r11)/* Get the level 1 entry */
> >>> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the level 1 entry */
> >>>
> > On the face of it that fragment doesn't look right when CONFIG_MODULES is undefined.
> >
> > David
> >
> I'm not sure I understand what you mean.
>
> The other part of the patch adds the following:
> + li r5, (swapper_pg_dir-PAGE_OFFSET)@l
> + sub r4, r4, r5
>
> r4 is the value put into SPRN_M_TW, so I don't see what may be wrong.
Ok, but it is completely non-obvious.
You probably need to change some comments somewhere about what is held
in SPRN_M_TW - since it is no longer the L1 base address, but that value
offset by some 'random' amount.
David
^ permalink raw reply [flat|nested] 12+ messages in thread
* RE: [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
@ 2015-01-06 14:41 ` David Laight
0 siblings, 0 replies; 12+ messages in thread
From: David Laight @ 2015-01-06 14:41 UTC (permalink / raw)
To: 'leroy christophe', 'Joakim Tjernlund'
Cc: scottwood, linuxppc-dev, paulus, linux-kernel
From: leroy christophe
> Le 06/01/2015 13:08, David Laight a =E9crit :
> >> On Tue, 2014-12-16 at 16:03 +0100, Christophe Leroy wrote:
> >>> All accessed to PGD entries are done via 0(r11).
> >>> By using lower part of swapper_pg_dir as load index to r11, we can re=
move the
> >>> ori instruction.
> >>>
> >>> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> >> Nice :)
> >> Acked-by: Joakim Tjernlund <joakim.tjernlund@transmode.se>
> >>
> >>> ---
> >>> arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
> >>> 1 file changed, 10 insertions(+), 12 deletions(-)
> >>>
> >>> diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/hea=
d_8xx.S
> >>> index ae05f28..aa45225 100644
> >>> --- a/arch/powerpc/kernel/head_8xx.S
> >>> +++ b/arch/powerpc/kernel/head_8xx.S
> >>> @@ -322,13 +322,12 @@ InstructionTLBMiss:
> >>> mfspr r11, SPRN_M_TW/* Get level 1 table base address */
> >>> #ifdef CONFIG_MODULES
> >>> beq 3f
> >>> - lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
> >>> - ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
> >>> + lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
> >>> 3:
> >>> #endif
> >>> /* Insert level 1 index */
> >>> rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT =
- 2) << 1, 29
> >>> - lwz r11, 0(r11)/* Get the level 1 entry */
> >>> + lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11)/* Get the le=
vel 1 entry */
> >>>
> > On the face of it that fragment doesn't look right when CONFIG_MODULES =
is undefined.
> >
> > David
> >
> I'm not sure I understand what you mean.
>=20
> The other part of the patch adds the following:
> + li r5, (swapper_pg_dir-PAGE_OFFSET)@l
> + sub r4, r4, r5
>=20
> r4 is the value put into SPRN_M_TW, so I don't see what may be wrong.
Ok, but it is completely non-obvious.
You probably need to change some comments somewhere about what is held
in SPRN_M_TW - since it is no longer the L1 base address, but that value
offset by some 'random' amount.
David
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
@ 2015-04-20 5:26 ` Christophe Leroy
0 siblings, 0 replies; 12+ messages in thread
From: Christophe Leroy @ 2015-04-20 5:26 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, scottwood
Cc: linux-kernel, linuxppc-dev, Joakim Tjernlund
All accessed to PGD entries are done via 0(r11).
By using lower part of swapper_pg_dir as load index to r11, we can remove the
ori instruction.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index ae05f28..aa45225 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -322,13 +322,12 @@ InstructionTLBMiss:
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
#ifdef CONFIG_MODULES
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
#endif
/* Insert level 1 index */
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* Load the MI_TWC with the attributes for this "segment." */
MTSPR_CPU6(SPRN_MI_TWC, r11, r3) /* Set segment attributes */
@@ -376,12 +375,11 @@ DataStoreTLBMiss:
andis. r11, r10, 0x8000
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
/* Insert level 1 index */
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* We have a pte table, so load fetch the pte from the table.
*/
@@ -510,12 +508,11 @@ FixupDAR:/* Entry point for dcbx workaround. */
mfspr r10, SPRN_SRR0
andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
- beq- 3f /* Branch if user space */
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ beq 3f
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
/* Insert level 1 index */
3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
rlwinm r11, r11,0,0,19 /* Extract page descriptor page address */
/* Insert level 2 index */
rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
@@ -670,8 +667,7 @@ start_here:
* init's THREAD like the context switch code does, but this is
* easier......until someone changes init's static structures.
*/
- lis r6, swapper_pg_dir@h
- ori r6, r6, swapper_pg_dir@l
+ lis r6, swapper_pg_dir@ha
tophys(r6,r6)
#ifdef CONFIG_8xx_CPU6
lis r4, cpu6_errata_word@h
@@ -850,6 +846,8 @@ _GLOBAL(set_context)
stw r4, 0x4(r5)
#endif
+ li r5, (swapper_pg_dir-PAGE_OFFSET)@l
+ sub r4, r4, r5
#ifdef CONFIG_8xx_CPU6
lis r6, cpu6_errata_word@h
ori r6, r6, cpu6_errata_word@l
--
2.1.0
^ permalink raw reply related [flat|nested] 12+ messages in thread
* [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir
@ 2015-04-20 5:26 ` Christophe Leroy
0 siblings, 0 replies; 12+ messages in thread
From: Christophe Leroy @ 2015-04-20 5:26 UTC (permalink / raw)
To: Benjamin Herrenschmidt, Paul Mackerras, Michael Ellerman, scottwood
Cc: linuxppc-dev, linux-kernel
All accessed to PGD entries are done via 0(r11).
By using lower part of swapper_pg_dir as load index to r11, we can remove the
ori instruction.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
arch/powerpc/kernel/head_8xx.S | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index ae05f28..aa45225 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -322,13 +322,12 @@ InstructionTLBMiss:
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
#ifdef CONFIG_MODULES
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
#endif
/* Insert level 1 index */
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* Load the MI_TWC with the attributes for this "segment." */
MTSPR_CPU6(SPRN_MI_TWC, r11, r3) /* Set segment attributes */
@@ -376,12 +375,11 @@ DataStoreTLBMiss:
andis. r11, r10, 0x8000
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
beq 3f
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
3:
/* Insert level 1 index */
rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
/* We have a pte table, so load fetch the pte from the table.
*/
@@ -510,12 +508,11 @@ FixupDAR:/* Entry point for dcbx workaround. */
mfspr r10, SPRN_SRR0
andis. r11, r10, 0x8000 /* Address >= 0x80000000 */
mfspr r11, SPRN_M_TW /* Get level 1 table base address */
- beq- 3f /* Branch if user space */
- lis r11, (swapper_pg_dir-PAGE_OFFSET)@h
- ori r11, r11, (swapper_pg_dir-PAGE_OFFSET)@l
+ beq 3f
+ lis r11, (swapper_pg_dir-PAGE_OFFSET)@ha
/* Insert level 1 index */
3: rlwimi r11, r10, 32 - ((PAGE_SHIFT - 2) << 1), (PAGE_SHIFT - 2) << 1, 29
- lwz r11, 0(r11) /* Get the level 1 entry */
+ lwz r11, (swapper_pg_dir-PAGE_OFFSET)@l(r11) /* Get the level 1 entry */
rlwinm r11, r11,0,0,19 /* Extract page descriptor page address */
/* Insert level 2 index */
rlwimi r11, r10, 32 - (PAGE_SHIFT - 2), 32 - PAGE_SHIFT, 29
@@ -670,8 +667,7 @@ start_here:
* init's THREAD like the context switch code does, but this is
* easier......until someone changes init's static structures.
*/
- lis r6, swapper_pg_dir@h
- ori r6, r6, swapper_pg_dir@l
+ lis r6, swapper_pg_dir@ha
tophys(r6,r6)
#ifdef CONFIG_8xx_CPU6
lis r4, cpu6_errata_word@h
@@ -850,6 +846,8 @@ _GLOBAL(set_context)
stw r4, 0x4(r5)
#endif
+ li r5, (swapper_pg_dir-PAGE_OFFSET)@l
+ sub r4, r4, r5
#ifdef CONFIG_8xx_CPU6
lis r6, cpu6_errata_word@h
ori r6, r6, cpu6_errata_word@l
--
2.1.0
^ permalink raw reply related [flat|nested] 12+ messages in thread
end of thread, other threads:[~2015-04-20 5:30 UTC | newest]
Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-12-16 15:03 [PATCH 05/11] powerpc/8xx: Optimise access to swapper_pg_dir Christophe Leroy
2014-12-16 15:03 ` Christophe Leroy
2015-01-05 18:33 ` Joakim Tjernlund
2015-01-05 18:33 ` Joakim Tjernlund
2015-01-06 12:08 ` David Laight
2015-01-06 12:08 ` David Laight
2015-01-06 13:27 ` leroy christophe
2015-01-06 13:27 ` leroy christophe
2015-01-06 14:41 ` David Laight
2015-01-06 14:41 ` David Laight
2015-04-20 5:26 Christophe Leroy
2015-04-20 5:26 ` Christophe Leroy
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