* [PATCH 1/4] powerpc/kernel: Drop HMT_MEDIUM_PPR_DISCARD
@ 2015-11-25 3:25 Michael Ellerman
2015-11-25 3:25 ` [PATCH 2/4] powerpc/kernel: Open code HMT_MEDIUM_LOW_HAS_PPR Michael Ellerman
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: Michael Ellerman @ 2015-11-25 3:25 UTC (permalink / raw)
To: linuxppc-dev
HMT_MEDIUM_PPR_DISCARD is a macro which is present at the start of most
of our first level exception handlers. It conditionally executes a
HMT_MEDIUM instruction, which sets the processor priority to medium.
On on modern systems, ie. Power7 and later, it is nop'ed out at boot.
All it does is make the exception vectors more cramped, and consume 4
bytes of icache.
On old systems it has the effect of boosting the processor priority at
the start of exception processing. If we were previously in the idle
loop for example, we may be at low or very low priority. This is
desirable as we want to process the exception as fast as possible.
However looking closely at the generated code, we see that in all cases
we execute another HMT_MEDIUM just four instructions later. With code
patching applied, the final code on an old (Power6) system will look
like, eg:
c000000000000300 <data_access_pSeries>:
c000000000000300: 7c 42 13 78 mr r2,r2 <-
c000000000000304: 7d b2 43 a6 mtsprg 2,r13
c000000000000308: 7d b1 42 a6 mfsprg r13,1
c00000000000030c: f9 2d 00 80 std r9,128(r13)
c000000000000310: 60 00 00 00 nop
c000000000000314: 7c 42 13 78 mr r2,r2 <-
So I suggest that the added code complexity of HMT_MEDIUM_PPR_DISCARD is
not justified by the benefit of boosting the processor priority for the
duration of four instructions, and therefore we drop it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/include/asm/exception-64s.h | 15 ---------------
arch/powerpc/kernel/exceptions-64s.S | 9 ---------
2 files changed, 24 deletions(-)
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 77f52b26dad6..9b91879b7876 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -130,15 +130,6 @@ BEGIN_FTR_SECTION_NESTED(941) \
END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,941)
/*
- * Increase the priority on systems where PPR save/restore is not
- * implemented/ supported.
- */
-#define HMT_MEDIUM_PPR_DISCARD \
-BEGIN_FTR_SECTION_NESTED(942) \
- HMT_MEDIUM; \
-END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,0,942) /*non P7*/
-
-/*
* Get an SPR into a register if the CPU has the given feature
*/
#define OPT_GET_SPR(ra, spr, ftr) \
@@ -357,7 +348,6 @@ do_kvm_##n: \
. = loc; \
.globl label##_pSeries; \
label##_pSeries: \
- HMT_MEDIUM_PPR_DISCARD; \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
EXC_STD, KVMTEST_PR, vec)
@@ -373,7 +363,6 @@ label##_pSeries: \
. = loc; \
.globl label##_hv; \
label##_hv: \
- HMT_MEDIUM_PPR_DISCARD; \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
EXC_HV, KVMTEST, vec)
@@ -389,7 +378,6 @@ label##_hv: \
. = loc; \
.globl label##_relon_pSeries; \
label##_relon_pSeries: \
- HMT_MEDIUM_PPR_DISCARD; \
/* No guest interrupts come through here */ \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
@@ -405,7 +393,6 @@ label##_relon_pSeries: \
. = loc; \
.globl label##_relon_hv; \
label##_relon_hv: \
- HMT_MEDIUM_PPR_DISCARD; \
/* No guest interrupts come through here */ \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
@@ -463,7 +450,6 @@ label##_relon_hv: \
. = loc; \
.globl label##_pSeries; \
label##_pSeries: \
- HMT_MEDIUM_PPR_DISCARD; \
_MASKABLE_EXCEPTION_PSERIES(vec, label, \
EXC_STD, SOFTEN_TEST_PR)
@@ -481,7 +467,6 @@ label##_hv: \
EXCEPTION_PROLOG_PSERIES_1(label##_common, EXC_HV);
#define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
- HMT_MEDIUM_PPR_DISCARD; \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_PROLOG_0(PACA_EXGEN); \
__EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 0a0399c2af11..9035bda220f5 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -96,7 +96,6 @@ __start_interrupts:
.globl system_reset_pSeries;
system_reset_pSeries:
- HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
#ifdef CONFIG_PPC_P7_NAP
BEGIN_FTR_SECTION
@@ -164,7 +163,6 @@ machine_check_pSeries_1:
* some code path might still want to branch into the original
* vector
*/
- HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13) /* save r13 */
#ifdef CONFIG_PPC_P7_NAP
BEGIN_FTR_SECTION
@@ -199,7 +197,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
. = 0x300
.globl data_access_pSeries
data_access_pSeries:
- HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
KVMTEST, 0x300)
@@ -207,7 +204,6 @@ data_access_pSeries:
. = 0x380
.globl data_access_slb_pSeries
data_access_slb_pSeries:
- HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXSLB)
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
@@ -239,7 +235,6 @@ data_access_slb_pSeries:
. = 0x480
.globl instruction_access_slb_pSeries
instruction_access_slb_pSeries:
- HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_0(PACA_EXSLB)
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
@@ -269,7 +264,6 @@ instruction_access_slb_pSeries:
.globl hardware_interrupt_hv;
hardware_interrupt_pSeries:
hardware_interrupt_hv:
- HMT_MEDIUM_PPR_DISCARD
BEGIN_FTR_SECTION
_MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
EXC_HV, SOFTEN_TEST_HV)
@@ -413,7 +407,6 @@ hv_facility_unavailable_trampoline:
. = 0x1500
.global denorm_exception_hv
denorm_exception_hv:
- HMT_MEDIUM_PPR_DISCARD
mtspr SPRN_SPRG_HSCRATCH0,r13
EXCEPTION_PROLOG_0(PACA_EXGEN)
EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
@@ -527,7 +520,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
machine_check_pSeries:
.globl machine_check_fwnmi
machine_check_fwnmi:
- HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_0(PACA_EXMC)
machine_check_pSeries_0:
@@ -711,7 +703,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
.globl system_reset_fwnmi
.align 7
system_reset_fwnmi:
- HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
NOTEST, 0x100)
--
2.5.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 2/4] powerpc/kernel: Open code HMT_MEDIUM_LOW_HAS_PPR
2015-11-25 3:25 [PATCH 1/4] powerpc/kernel: Drop HMT_MEDIUM_PPR_DISCARD Michael Ellerman
@ 2015-11-25 3:25 ` Michael Ellerman
2015-11-25 3:25 ` [PATCH 3/4] powerpc/kernel: Open code SET_DEFAULT_THREAD_PPR Michael Ellerman
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2015-11-25 3:25 UTC (permalink / raw)
To: linuxppc-dev
HMT_MEDIUM_LOW_HAS_PPR is only used in once place, open code it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/include/asm/ppc_asm.h | 5 -----
arch/powerpc/kernel/entry_64.S | 6 +++++-
2 files changed, 5 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index dd0fc18d8103..67f05d4935a0 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -418,11 +418,6 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
* PPR restore macros used in entry_64.S
* Used for P7 or later processors
*/
-#define HMT_MEDIUM_LOW_HAS_PPR \
-BEGIN_FTR_SECTION_NESTED(944) \
- HMT_MEDIUM_LOW; \
-END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,944)
-
#define SET_DEFAULT_THREAD_PPR(ra, rb) \
BEGIN_FTR_SECTION_NESTED(945) \
lis ra,INIT_PPR@highest; /* default ppr=3 */ \
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index a94f155db78e..c8a60aa07aa5 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -223,7 +223,11 @@ END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
beq- 1f
ACCOUNT_CPU_USER_EXIT(r11, r12)
- HMT_MEDIUM_LOW_HAS_PPR
+
+BEGIN_FTR_SECTION
+ HMT_MEDIUM_LOW
+END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
+
ld r13,GPR13(r1) /* only restore r13 if returning to usermode */
1: ld r2,GPR2(r1)
ld r1,GPR1(r1)
--
2.5.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 3/4] powerpc/kernel: Open code SET_DEFAULT_THREAD_PPR
2015-11-25 3:25 [PATCH 1/4] powerpc/kernel: Drop HMT_MEDIUM_PPR_DISCARD Michael Ellerman
2015-11-25 3:25 ` [PATCH 2/4] powerpc/kernel: Open code HMT_MEDIUM_LOW_HAS_PPR Michael Ellerman
@ 2015-11-25 3:25 ` Michael Ellerman
2015-11-25 3:25 ` [PATCH 4/4] powerpc/kernel: Combine vec/loc for STD_EXCEPTION_PSERIES Michael Ellerman
2015-12-17 11:57 ` [1/4] powerpc/kernel: Drop HMT_MEDIUM_PPR_DISCARD Michael Ellerman
3 siblings, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2015-11-25 3:25 UTC (permalink / raw)
To: linuxppc-dev
This is only used in one location, open code it.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/include/asm/ppc_asm.h | 13 -------------
arch/powerpc/kernel/entry_64.S | 8 +++++++-
2 files changed, 7 insertions(+), 14 deletions(-)
diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 67f05d4935a0..499d9f89435a 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -413,19 +413,6 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
FTR_SECTION_ELSE_NESTED(848); \
mtocrf (FXM), RS; \
ALT_FTR_SECTION_END_NESTED_IFCLR(CPU_FTR_NOEXECUTE, 848)
-
-/*
- * PPR restore macros used in entry_64.S
- * Used for P7 or later processors
- */
-#define SET_DEFAULT_THREAD_PPR(ra, rb) \
-BEGIN_FTR_SECTION_NESTED(945) \
- lis ra,INIT_PPR@highest; /* default ppr=3 */ \
- ld rb,PACACURRENT(r13); \
- sldi ra,ra,32; /* 11- 13 bits are used for ppr */ \
- std ra,TASKTHREADPPR(rb); \
-END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,945)
-
#endif
/*
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index c8a60aa07aa5..a4b0f03cf124 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -316,7 +316,13 @@ syscall_exit_work:
subi r12,r12,TI_FLAGS
4: /* Anything else left to do? */
- SET_DEFAULT_THREAD_PPR(r3, r10) /* Set thread.ppr = 3 */
+BEGIN_FTR_SECTION
+ lis r3,INIT_PPR@highest /* Set thread.ppr = 3 */
+ ld r10,PACACURRENT(r13)
+ sldi r3,r3,32 /* bits 11-13 are used for ppr */
+ std r3,TASKTHREADPPR(r10)
+END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
+
andi. r0,r9,(_TIF_SYSCALL_DOTRACE|_TIF_SINGLESTEP)
beq ret_from_except_lite
--
2.5.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 4/4] powerpc/kernel: Combine vec/loc for STD_EXCEPTION_PSERIES
2015-11-25 3:25 [PATCH 1/4] powerpc/kernel: Drop HMT_MEDIUM_PPR_DISCARD Michael Ellerman
2015-11-25 3:25 ` [PATCH 2/4] powerpc/kernel: Open code HMT_MEDIUM_LOW_HAS_PPR Michael Ellerman
2015-11-25 3:25 ` [PATCH 3/4] powerpc/kernel: Open code SET_DEFAULT_THREAD_PPR Michael Ellerman
@ 2015-11-25 3:25 ` Michael Ellerman
2015-12-17 11:57 ` [1/4] powerpc/kernel: Drop HMT_MEDIUM_PPR_DISCARD Michael Ellerman
3 siblings, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2015-11-25 3:25 UTC (permalink / raw)
To: linuxppc-dev
The STD_EXCEPTION_PSERIES macro takes both a vector number, and a
location (memory address). However both are always identical, so combine
them to save repeating ourselves.
This does mean an exception handler must always exist at the location in
memory that matches its vector number. But that's OK because this is the
"STD" macro (standard), which does exactly that. We have other macros
for the other cases, eg. STD_EXCEPTION_PSERIES_OOL (out of line).
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
---
arch/powerpc/include/asm/exception-64s.h | 4 ++--
arch/powerpc/kernel/exceptions-64s.S | 16 ++++++++--------
2 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index 9b91879b7876..1609448e2583 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -344,8 +344,8 @@ do_kvm_##n: \
/*
* Exception vectors.
*/
-#define STD_EXCEPTION_PSERIES(loc, vec, label) \
- . = loc; \
+#define STD_EXCEPTION_PSERIES(vec, label) \
+ . = vec; \
.globl label##_pSeries; \
label##_pSeries: \
SET_SCRATCH0(r13); /* save r13 */ \
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 9035bda220f5..7ee72d47f926 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -230,7 +230,7 @@ data_access_slb_pSeries:
bctr
#endif
- STD_EXCEPTION_PSERIES(0x400, 0x400, instruction_access)
+ STD_EXCEPTION_PSERIES(0x400, instruction_access)
. = 0x480
.globl instruction_access_slb_pSeries
@@ -274,13 +274,13 @@ hardware_interrupt_hv:
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
- STD_EXCEPTION_PSERIES(0x600, 0x600, alignment)
+ STD_EXCEPTION_PSERIES(0x600, alignment)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x600)
- STD_EXCEPTION_PSERIES(0x700, 0x700, program_check)
+ STD_EXCEPTION_PSERIES(0x700, program_check)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x700)
- STD_EXCEPTION_PSERIES(0x800, 0x800, fp_unavailable)
+ STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x800)
. = 0x900
@@ -293,7 +293,7 @@ decrementer_pSeries:
MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xa00)
- STD_EXCEPTION_PSERIES(0xb00, 0xb00, trap_0b)
+ STD_EXCEPTION_PSERIES(0xb00, trap_0b)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xb00)
. = 0xc00
@@ -325,7 +325,7 @@ system_call_pSeries:
SYSCALL_PSERIES_3
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
- STD_EXCEPTION_PSERIES(0xd00, 0xd00, single_step)
+ STD_EXCEPTION_PSERIES(0xd00, single_step)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xd00)
/* At 0xe??? we have a bunch of hypervisor exceptions, we branch
@@ -401,7 +401,7 @@ hv_facility_unavailable_trampoline:
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
#endif /* CONFIG_CBE_RAS */
- STD_EXCEPTION_PSERIES(0x1300, 0x1300, instruction_breakpoint)
+ STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
KVM_HANDLER_PR_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
. = 0x1500
@@ -428,7 +428,7 @@ denorm_exception_hv:
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
#endif /* CONFIG_CBE_RAS */
- STD_EXCEPTION_PSERIES(0x1700, 0x1700, altivec_assist)
+ STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0x1700)
#ifdef CONFIG_CBE_RAS
--
2.5.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [1/4] powerpc/kernel: Drop HMT_MEDIUM_PPR_DISCARD
2015-11-25 3:25 [PATCH 1/4] powerpc/kernel: Drop HMT_MEDIUM_PPR_DISCARD Michael Ellerman
` (2 preceding siblings ...)
2015-11-25 3:25 ` [PATCH 4/4] powerpc/kernel: Combine vec/loc for STD_EXCEPTION_PSERIES Michael Ellerman
@ 2015-12-17 11:57 ` Michael Ellerman
3 siblings, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2015-12-17 11:57 UTC (permalink / raw)
To: Michael Ellerman, linuxppc-dev
On Wed, 2015-25-11 at 03:25:16 UTC, Michael Ellerman wrote:
> HMT_MEDIUM_PPR_DISCARD is a macro which is present at the start of most
> of our first level exception handlers. It conditionally executes a
> HMT_MEDIUM instruction, which sets the processor priority to medium.
>
> On on modern systems, ie. Power7 and later, it is nop'ed out at boot.
> All it does is make the exception vectors more cramped, and consume 4
> bytes of icache.
>
> On old systems it has the effect of boosting the processor priority at
> the start of exception processing. If we were previously in the idle
> loop for example, we may be at low or very low priority. This is
> desirable as we want to process the exception as fast as possible.
>
> However looking closely at the generated code, we see that in all cases
> we execute another HMT_MEDIUM just four instructions later. With code
> patching applied, the final code on an old (Power6) system will look
> like, eg:
>
> c000000000000300 <data_access_pSeries>:
> c000000000000300: 7c 42 13 78 mr r2,r2 <-
> c000000000000304: 7d b2 43 a6 mtsprg 2,r13
> c000000000000308: 7d b1 42 a6 mfsprg r13,1
> c00000000000030c: f9 2d 00 80 std r9,128(r13)
> c000000000000310: 60 00 00 00 nop
> c000000000000314: 7c 42 13 78 mr r2,r2 <-
>
> So I suggest that the added code complexity of HMT_MEDIUM_PPR_DISCARD is
> not justified by the benefit of boosting the processor priority for the
> duration of four instructions, and therefore we drop it.
>
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Series applied to powerpc next.
https://git.kernel.org/powerpc/c/d6265aeaf815801ad53a95f11c
cheers
^ permalink raw reply [flat|nested] 5+ messages in thread
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