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powerpc: Implement PPR save/restore

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[PATCH 6/6] powerpc: Implement PPR save/restore

When the task enters in to kernel space, the user defined priority (PPR)
will be saved in to PACA at the beginning of first level exception
vector and then copy from PACA to thread_info in second level vector.
PPR will be restored from thread_info before exits the kernel space.

P7/P8 temporarily raises the thread priority to higher level during
exception until the program executes HMT_* calls. But it will not modify
PPR register. So we save PPR value whenever some register is available
to use and then calls HMT_MEDIUM to increase the priority. This feature
supports on P7 or later processors.

We save/ restore PPR for all exception vectors except system call entry.
GLIBC will be saving / restore for system calls. So the default PPR
value (3) will be set for the system call exit when the task returned
to the user space.

Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Haren Myneni 2012-12-06 21:51:04 +00:00 committed by Benjamin Herrenschmidt
parent 13e7a8e846
commit 44e9309f1f
3 changed files with 26 additions and 18 deletions
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18
arch/powerpc/include/asm/exception-64s.h
View File

@ -147,8 +147,9 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,943)
#define __EXCEPTION_PROLOG_1(area, extra, vec) \
GET_PACA(r13); \
std r9,area+EX_R9(r13); /* save r9 - r12 */ \
std r10,area+EX_R10(r13); \
std r9,area+EX_R9(r13); /* save r9 */ \
HMT_MEDIUM_PPR_SAVE(area, r9); \
std r10,area+EX_R10(r13); /* save r10 - r12 */ \
BEGIN_FTR_SECTION_NESTED(66); \
mfspr r10,SPRN_CFAR; \
std r10,area+EX_CFAR(r13); \
@ -264,6 +265,7 @@ do_kvm_##n: \
std r10,GPR1(r1); /* save r1 in stackframe */ \
beq 4f; /* if from kernel mode */ \
ACCOUNT_CPU_USER_ENTRY(r9, r10); \
SAVE_PPR(area, r9, r10); \
4: std r2,GPR2(r1); /* save r2 in stackframe */ \
SAVE_4GPRS(3, r1); /* save r3 - r6 in stackframe */ \
SAVE_2GPRS(7, r1); /* save r7, r8 in stackframe */ \
@ -305,7 +307,7 @@ do_kvm_##n: \
. = loc; \
.globl label##_pSeries; \
label##_pSeries: \
HMT_MEDIUM; \
HMT_MEDIUM_PPR_DISCARD; \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
EXC_STD, KVMTEST_PR, vec)
@ -314,7 +316,7 @@ label##_pSeries: \
. = loc; \
.globl label##_hv; \
label##_hv: \
HMT_MEDIUM; \
HMT_MEDIUM_PPR_DISCARD; \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
EXC_HV, KVMTEST, vec)
@ -323,7 +325,7 @@ label##_hv: \
. = loc; \
.globl label##_relon_pSeries; \
label##_relon_pSeries: \
HMT_MEDIUM; \
HMT_MEDIUM_PPR_DISCARD; \
/* No guest interrupts come through here */ \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
@ -333,7 +335,7 @@ label##_relon_pSeries: \
. = loc; \
.globl label##_relon_hv; \
label##_relon_hv: \
HMT_MEDIUM; \
HMT_MEDIUM_PPR_DISCARD; \
/* No guest interrupts come through here */ \
SET_SCRATCH0(r13); /* save r13 */ \
EXCEPTION_RELON_PROLOG_PSERIES(PACA_EXGEN, label##_common, \
@ -371,7 +373,7 @@ label##_relon_hv: \
#define SOFTEN_NOTEST_HV(vec) _SOFTEN_TEST(EXC_HV, vec)
#define __MASKABLE_EXCEPTION_PSERIES(vec, label, h, extra) \
HMT_MEDIUM; \
HMT_MEDIUM_PPR_DISCARD; \
SET_SCRATCH0(r13); /* save r13 */ \
__EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
EXCEPTION_PROLOG_PSERIES_1(label##_common, h);
@ -393,7 +395,7 @@ label##_hv: \
EXC_HV, SOFTEN_TEST_HV)
#define __MASKABLE_RELON_EXCEPTION_PSERIES(vec, label, h, extra) \
HMT_MEDIUM; \
HMT_MEDIUM_PPR_DISCARD; \
SET_SCRATCH0(r13); /* save r13 */ \
__EXCEPTION_PROLOG_1(PACA_EXGEN, extra, vec); \
EXCEPTION_RELON_PROLOG_PSERIES_1(label##_common, h);

3
arch/powerpc/kernel/entry_64.S
View File

@ -227,6 +227,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
beq- 1f
ACCOUNT_CPU_USER_EXIT(r11, r12)
HMT_MEDIUM_LOW_HAS_PPR
ld r13,GPR13(r1) /* only restore r13 if returning to usermode */
1: ld r2,GPR2(r1)
ld r1,GPR1(r1)
@ -303,6 +304,7 @@ syscall_exit_work:
subi r12,r12,TI_FLAGS
4: /* Anything else left to do? */
SET_DEFAULT_THREAD_PPR(r3, r9) /* Set thread.ppr = 3 */
andi. r0,r9,(_TIF_SYSCALL_T_OR_A|_TIF_SINGLESTEP)
beq .ret_from_except_lite
@ -758,6 +760,7 @@ fast_exception_return:
andi. r0,r3,MSR_PR
beq 1f
ACCOUNT_CPU_USER_EXIT(r2, r4)
RESTORE_PPR(r2, r4)
REST_GPR(13, r1)
1:
mtspr SPRN_SRR1,r3

23
arch/powerpc/kernel/exceptions-64s.S
View File

@ -104,7 +104,7 @@ __start_interrupts:
.globl system_reset_pSeries;
system_reset_pSeries:
HMT_MEDIUM;
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
#ifdef CONFIG_PPC_P7_NAP
BEGIN_FTR_SECTION
@ -158,7 +158,7 @@ machine_check_pSeries_1:
. = 0x300
.globl data_access_pSeries
data_access_pSeries:
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
BEGIN_FTR_SECTION
b data_access_check_stab
@ -170,7 +170,7 @@ END_MMU_FTR_SECTION_IFCLR(MMU_FTR_SLB)
. = 0x380
.globl data_access_slb_pSeries
data_access_slb_pSeries:
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
std r3,PACA_EXSLB+EX_R3(r13)
@ -201,7 +201,7 @@ data_access_slb_pSeries:
. = 0x480
.globl instruction_access_slb_pSeries
instruction_access_slb_pSeries:
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST_PR, 0x480)
std r3,PACA_EXSLB+EX_R3(r13)
@ -324,10 +324,11 @@ vsx_unavailable_pSeries_1:
. = 0x1500
.global denorm_exception_hv
denorm_exception_hv:
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
mtspr SPRN_SPRG_HSCRATCH0,r13
mfspr r13,SPRN_SPRG_HPACA
std r9,PACA_EXGEN+EX_R9(r13)
HMT_MEDIUM_PPR_SAVE(PACA_EXGEN, r9)
std r10,PACA_EXGEN+EX_R10(r13)
std r11,PACA_EXGEN+EX_R11(r13)
std r12,PACA_EXGEN+EX_R12(r13)
@ -369,7 +370,7 @@ denorm_exception_hv:
machine_check_pSeries:
.globl machine_check_fwnmi
machine_check_fwnmi:
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common,
EXC_STD, KVMTEST, 0x200)
@ -498,6 +499,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
mtspr SPRN_HSRR0,r11
mtcrf 0x80,r9
ld r9,PACA_EXGEN+EX_R9(r13)
RESTORE_PPR_PACA(PACA_EXGEN, r10)
ld r10,PACA_EXGEN+EX_R10(r13)
ld r11,PACA_EXGEN+EX_R11(r13)
ld r12,PACA_EXGEN+EX_R12(r13)
@ -603,7 +605,7 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
.globl system_reset_fwnmi
.align 7
system_reset_fwnmi:
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13) /* save r13 */
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
NOTEST, 0x100)
@ -716,7 +718,7 @@ machine_check_common:
. = 0x4380
.globl data_access_slb_relon_pSeries
data_access_slb_relon_pSeries:
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
std r3,PACA_EXSLB+EX_R3(r13)
@ -741,7 +743,7 @@ data_access_slb_relon_pSeries:
. = 0x4480
.globl instruction_access_slb_relon_pSeries
instruction_access_slb_relon_pSeries:
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
std r3,PACA_EXSLB+EX_R3(r13)
@ -1062,6 +1064,7 @@ _GLOBAL(slb_miss_realmode)
mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
.machine pop
RESTORE_PPR_PACA(PACA_EXSLB, r9)
ld r9,PACA_EXSLB+EX_R9(r13)
ld r10,PACA_EXSLB+EX_R10(r13)
ld r11,PACA_EXSLB+EX_R11(r13)
@ -1411,7 +1414,7 @@ initial_stab:
#ifdef CONFIG_PPC_POWERNV
_GLOBAL(opal_mc_secondary_handler)
HMT_MEDIUM
HMT_MEDIUM_PPR_DISCARD
SET_SCRATCH0(r13)
GET_PACA(r13)
clrldi r3,r3,2