Message ID | 153072717270.29016.18207683951100257477.stgit@jupiter.in.ibm.com (mailing list archive) |
---|---|
State | Superseded |
Headers | show |
Series | powerpc/pseries: Machine check handler improvements. | expand |
On Wed, 04 Jul 2018 23:30:12 +0530 Mahesh J Salgaonkar <mahesh@linux.vnet.ibm.com> wrote: > From: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> > > Now that other platforms also implements real mode mce handler, > lets consolidate the code by sharing existing powernv machine check > early code. Rename machine_check_powernv_early to > machine_check_common_early and reuse the code. > > Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> > --- > arch/powerpc/kernel/exceptions-64s.S | 56 +++++++--------------------------- > 1 file changed, 11 insertions(+), 45 deletions(-) > > diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S > index 0038596b7906..3e877ec55d50 100644 > --- a/arch/powerpc/kernel/exceptions-64s.S > +++ b/arch/powerpc/kernel/exceptions-64s.S > @@ -243,14 +243,13 @@ EXC_REAL_BEGIN(machine_check, 0x200, 0x100) > SET_SCRATCH0(r13) /* save r13 */ > EXCEPTION_PROLOG_0(PACA_EXMC) > BEGIN_FTR_SECTION > - b machine_check_powernv_early > + b machine_check_common_early > FTR_SECTION_ELSE > b machine_check_pSeries_0 > ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) > EXC_REAL_END(machine_check, 0x200, 0x100) > EXC_VIRT_NONE(0x4200, 0x100) > -TRAMP_REAL_BEGIN(machine_check_powernv_early) > -BEGIN_FTR_SECTION > +TRAMP_REAL_BEGIN(machine_check_common_early) > EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) > /* > * Register contents: > @@ -306,7 +305,9 @@ BEGIN_FTR_SECTION > /* Save r9 through r13 from EXMC save area to stack frame. */ > EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) > mfmsr r11 /* get MSR value */ > +BEGIN_FTR_SECTION > ori r11,r11,MSR_ME /* turn on ME bit */ > +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) > ori r11,r11,MSR_RI /* turn on RI bit */ > LOAD_HANDLER(r12, machine_check_handle_early) > 1: mtspr SPRN_SRR0,r12 > @@ -325,7 +326,6 @@ BEGIN_FTR_SECTION > andc r11,r11,r10 /* Turn off MSR_ME */ > b 1b > b . /* prevent speculative execution */ > -END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) > > TRAMP_REAL_BEGIN(machine_check_pSeries) > .globl machine_check_fwnmi > @@ -333,7 +333,7 @@ machine_check_fwnmi: > SET_SCRATCH0(r13) /* save r13 */ > EXCEPTION_PROLOG_0(PACA_EXMC) > BEGIN_FTR_SECTION > - b machine_check_pSeries_early > + b machine_check_common_early > END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) > machine_check_pSeries_0: > EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) > @@ -346,45 +346,6 @@ machine_check_pSeries_0: > > TRAMP_KVM_SKIP(PACA_EXMC, 0x200) > > -TRAMP_REAL_BEGIN(machine_check_pSeries_early) > -BEGIN_FTR_SECTION > - EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) > - mr r10,r1 /* Save r1 */ > - ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ > - subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ > - mfspr r11,SPRN_SRR0 /* Save SRR0 */ > - mfspr r12,SPRN_SRR1 /* Save SRR1 */ > - EXCEPTION_PROLOG_COMMON_1() > - EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) > - EXCEPTION_PROLOG_COMMON_3(0x200) > - addi r3,r1,STACK_FRAME_OVERHEAD > - BRANCH_LINK_TO_FAR(machine_check_early) /* Function call ABI */ > - > - /* Move original SRR0 and SRR1 into the respective regs */ > - ld r9,_MSR(r1) > - mtspr SPRN_SRR1,r9 > - ld r3,_NIP(r1) > - mtspr SPRN_SRR0,r3 > - ld r9,_CTR(r1) > - mtctr r9 > - ld r9,_XER(r1) > - mtxer r9 > - ld r9,_LINK(r1) > - mtlr r9 > - REST_GPR(0, r1) > - REST_8GPRS(2, r1) > - REST_GPR(10, r1) > - ld r11,_CCR(r1) > - mtcr r11 > - REST_GPR(11, r1) > - REST_2GPRS(12, r1) > - /* restore original r1. */ > - ld r1,GPR1(r1) > - SET_SCRATCH0(r13) /* save r13 */ > - EXCEPTION_PROLOG_0(PACA_EXMC) > - b machine_check_pSeries_0 > -END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) > - > EXC_COMMON_BEGIN(machine_check_common) > /* > * Machine check is different because we use a different > @@ -483,6 +444,9 @@ EXC_COMMON_BEGIN(machine_check_handle_early) > bl machine_check_early > std r3,RESULT(r1) /* Save result */ > ld r12,_MSR(r1) > +BEGIN_FTR_SECTION > + bne 9f /* pSeries: continue to V mode. */ > +END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) Should this be "b 9f" ? Although... > > #ifdef CONFIG_PPC_P7_NAP > /* > @@ -564,7 +528,9 @@ EXC_COMMON_BEGIN(machine_check_handle_early) > 9: > /* Deliver the machine check to host kernel in V mode. */ > MACHINE_CHECK_HANDLER_WINDUP > - b machine_check_pSeries > + SET_SCRATCH0(r13) /* save r13 */ > + EXCEPTION_PROLOG_0(PACA_EXMC) > + b machine_check_pSeries_0 I'm not sure that's quite right. You're missing out testing the result of the early handler call? Is this buggy in existing code too? We should be testing that result in all cases, shouldn't we? But it doesn't seem like we are. Thanks, Nick
On Fri, 6 Jul 2018 19:40:24 +1000 Nicholas Piggin <npiggin@gmail.com> wrote: > On Wed, 04 Jul 2018 23:30:12 +0530 > Mahesh J Salgaonkar <mahesh@linux.vnet.ibm.com> wrote: > > > From: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> > > > > Now that other platforms also implements real mode mce handler, > > lets consolidate the code by sharing existing powernv machine check > > early code. Rename machine_check_powernv_early to > > machine_check_common_early and reuse the code. > > > > Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> > > --- > > arch/powerpc/kernel/exceptions-64s.S | 56 > > +++++++--------------------------- 1 file changed, 11 > > insertions(+), 45 deletions(-) > > > > diff --git a/arch/powerpc/kernel/exceptions-64s.S > > b/arch/powerpc/kernel/exceptions-64s.S index > > 0038596b7906..3e877ec55d50 100644 --- > > a/arch/powerpc/kernel/exceptions-64s.S +++ > > b/arch/powerpc/kernel/exceptions-64s.S @@ -243,14 +243,13 @@ > > EXC_REAL_BEGIN(machine_check, 0x200, 0x100) > > SET_SCRATCH0(r13) /* save r13 */ > > EXCEPTION_PROLOG_0(PACA_EXMC) BEGIN_FTR_SECTION > > - b machine_check_powernv_early > > + b machine_check_common_early > > FTR_SECTION_ELSE > > b machine_check_pSeries_0 > > ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) > > EXC_REAL_END(machine_check, 0x200, 0x100) > > EXC_VIRT_NONE(0x4200, 0x100) > > -TRAMP_REAL_BEGIN(machine_check_powernv_early) > > -BEGIN_FTR_SECTION > > +TRAMP_REAL_BEGIN(machine_check_common_early) > > EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) > > /* > > * Register contents: > > @@ -306,7 +305,9 @@ BEGIN_FTR_SECTION > > /* Save r9 through r13 from EXMC save area to stack frame. > > */ EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) > > mfmsr r11 /* get MSR value */ > > +BEGIN_FTR_SECTION > > ori r11,r11,MSR_ME /* turn on ME bit > > */ +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) > > ori r11,r11,MSR_RI /* turn on RI bit > > */ LOAD_HANDLER(r12, machine_check_handle_early) > > 1: mtspr SPRN_SRR0,r12 > > @@ -325,7 +326,6 @@ BEGIN_FTR_SECTION > > andc r11,r11,r10 /* Turn off MSR_ME > > */ b 1b > > b . /* prevent speculative execution */ > > -END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) > > > > TRAMP_REAL_BEGIN(machine_check_pSeries) > > .globl machine_check_fwnmi > > @@ -333,7 +333,7 @@ machine_check_fwnmi: > > SET_SCRATCH0(r13) /* save r13 */ > > EXCEPTION_PROLOG_0(PACA_EXMC) > > BEGIN_FTR_SECTION > > - b machine_check_pSeries_early > > + b machine_check_common_early > > END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) > > machine_check_pSeries_0: > > EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) > > @@ -346,45 +346,6 @@ machine_check_pSeries_0: > > > > TRAMP_KVM_SKIP(PACA_EXMC, 0x200) > > > > -TRAMP_REAL_BEGIN(machine_check_pSeries_early) > > -BEGIN_FTR_SECTION > > - EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) > > - mr r10,r1 /* Save r1 */ > > - ld r1,PACAMCEMERGSP(r13) /* Use MC emergency > > stack */ > > - subi r1,r1,INT_FRAME_SIZE /* alloc stack > > frame */ > > - mfspr r11,SPRN_SRR0 /* Save SRR0 */ > > - mfspr r12,SPRN_SRR1 /* Save SRR1 */ > > - EXCEPTION_PROLOG_COMMON_1() > > - EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) > > - EXCEPTION_PROLOG_COMMON_3(0x200) > > - addi r3,r1,STACK_FRAME_OVERHEAD > > - BRANCH_LINK_TO_FAR(machine_check_early) /* Function call > > ABI */ - > > - /* Move original SRR0 and SRR1 into the respective regs */ > > - ld r9,_MSR(r1) > > - mtspr SPRN_SRR1,r9 > > - ld r3,_NIP(r1) > > - mtspr SPRN_SRR0,r3 > > - ld r9,_CTR(r1) > > - mtctr r9 > > - ld r9,_XER(r1) > > - mtxer r9 > > - ld r9,_LINK(r1) > > - mtlr r9 > > - REST_GPR(0, r1) > > - REST_8GPRS(2, r1) > > - REST_GPR(10, r1) > > - ld r11,_CCR(r1) > > - mtcr r11 > > - REST_GPR(11, r1) > > - REST_2GPRS(12, r1) > > - /* restore original r1. */ > > - ld r1,GPR1(r1) > > - SET_SCRATCH0(r13) /* save r13 */ > > - EXCEPTION_PROLOG_0(PACA_EXMC) > > - b machine_check_pSeries_0 > > -END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) > > - > > EXC_COMMON_BEGIN(machine_check_common) > > /* > > * Machine check is different because we use a different > > @@ -483,6 +444,9 @@ EXC_COMMON_BEGIN(machine_check_handle_early) > > bl machine_check_early > > std r3,RESULT(r1) /* Save result */ > > ld r12,_MSR(r1) > > +BEGIN_FTR_SECTION > > + bne 9f /* pSeries: continue > > to V mode. */ +END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) > > Should this be "b 9f" ? Although... > > > > > #ifdef CONFIG_PPC_P7_NAP > > /* > > @@ -564,7 +528,9 @@ EXC_COMMON_BEGIN(machine_check_handle_early) > > 9: > > /* Deliver the machine check to host kernel in V mode. */ > > MACHINE_CHECK_HANDLER_WINDUP > > - b machine_check_pSeries > > + SET_SCRATCH0(r13) /* save r13 */ > > + EXCEPTION_PROLOG_0(PACA_EXMC) > > + b machine_check_pSeries_0 > > I'm not sure that's quite right. You're missing out testing the result > of the early handler call? Is this buggy in existing code too? We > should be testing that result in all cases, shouldn't we? But it > doesn't seem like we are. At least for the pSeries case the result of realmode handler is stored in the MCE log data. Both the real and virtual part of the handler should be called in any case. They do different and independent things. Thanks Michal
On Mon, 9 Jul 2018 18:02:39 +0200 Michal Suchánek <msuchanek@suse.de> wrote: > On Fri, 6 Jul 2018 19:40:24 +1000 > Nicholas Piggin <npiggin@gmail.com> wrote: > > > On Wed, 04 Jul 2018 23:30:12 +0530 > > Mahesh J Salgaonkar <mahesh@linux.vnet.ibm.com> wrote: > > > > > From: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> > > > > > > Now that other platforms also implements real mode mce handler, > > > lets consolidate the code by sharing existing powernv machine check > > > early code. Rename machine_check_powernv_early to > > > machine_check_common_early and reuse the code. > > > > > > Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> > > > --- > > > arch/powerpc/kernel/exceptions-64s.S | 56 > > > +++++++--------------------------- 1 file changed, 11 > > > insertions(+), 45 deletions(-) > > > > > > diff --git a/arch/powerpc/kernel/exceptions-64s.S > > > b/arch/powerpc/kernel/exceptions-64s.S index > > > 0038596b7906..3e877ec55d50 100644 --- > > > a/arch/powerpc/kernel/exceptions-64s.S +++ > > > b/arch/powerpc/kernel/exceptions-64s.S @@ -243,14 +243,13 @@ > > > EXC_REAL_BEGIN(machine_check, 0x200, 0x100) > > > SET_SCRATCH0(r13) /* save r13 */ > > > EXCEPTION_PROLOG_0(PACA_EXMC) BEGIN_FTR_SECTION > > > - b machine_check_powernv_early > > > + b machine_check_common_early > > > FTR_SECTION_ELSE > > > b machine_check_pSeries_0 > > > ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) > > > EXC_REAL_END(machine_check, 0x200, 0x100) > > > EXC_VIRT_NONE(0x4200, 0x100) > > > -TRAMP_REAL_BEGIN(machine_check_powernv_early) > > > -BEGIN_FTR_SECTION > > > +TRAMP_REAL_BEGIN(machine_check_common_early) > > > EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) > > > /* > > > * Register contents: > > > @@ -306,7 +305,9 @@ BEGIN_FTR_SECTION > > > /* Save r9 through r13 from EXMC save area to stack frame. > > > */ EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) > > > mfmsr r11 /* get MSR value */ > > > +BEGIN_FTR_SECTION > > > ori r11,r11,MSR_ME /* turn on ME bit > > > */ +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) > > > ori r11,r11,MSR_RI /* turn on RI bit > > > */ LOAD_HANDLER(r12, machine_check_handle_early) > > > 1: mtspr SPRN_SRR0,r12 > > > @@ -325,7 +326,6 @@ BEGIN_FTR_SECTION > > > andc r11,r11,r10 /* Turn off MSR_ME > > > */ b 1b > > > b . /* prevent speculative execution */ > > > -END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) > > > > > > TRAMP_REAL_BEGIN(machine_check_pSeries) > > > .globl machine_check_fwnmi > > > @@ -333,7 +333,7 @@ machine_check_fwnmi: > > > SET_SCRATCH0(r13) /* save r13 */ > > > EXCEPTION_PROLOG_0(PACA_EXMC) > > > BEGIN_FTR_SECTION > > > - b machine_check_pSeries_early > > > + b machine_check_common_early > > > END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) > > > machine_check_pSeries_0: > > > EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) > > > @@ -346,45 +346,6 @@ machine_check_pSeries_0: > > > > > > TRAMP_KVM_SKIP(PACA_EXMC, 0x200) > > > > > > -TRAMP_REAL_BEGIN(machine_check_pSeries_early) > > > -BEGIN_FTR_SECTION > > > - EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) > > > - mr r10,r1 /* Save r1 */ > > > - ld r1,PACAMCEMERGSP(r13) /* Use MC emergency > > > stack */ > > > - subi r1,r1,INT_FRAME_SIZE /* alloc stack > > > frame */ > > > - mfspr r11,SPRN_SRR0 /* Save SRR0 */ > > > - mfspr r12,SPRN_SRR1 /* Save SRR1 */ > > > - EXCEPTION_PROLOG_COMMON_1() > > > - EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) > > > - EXCEPTION_PROLOG_COMMON_3(0x200) > > > - addi r3,r1,STACK_FRAME_OVERHEAD > > > - BRANCH_LINK_TO_FAR(machine_check_early) /* Function call > > > ABI */ - > > > - /* Move original SRR0 and SRR1 into the respective regs */ > > > - ld r9,_MSR(r1) > > > - mtspr SPRN_SRR1,r9 > > > - ld r3,_NIP(r1) > > > - mtspr SPRN_SRR0,r3 > > > - ld r9,_CTR(r1) > > > - mtctr r9 > > > - ld r9,_XER(r1) > > > - mtxer r9 > > > - ld r9,_LINK(r1) > > > - mtlr r9 > > > - REST_GPR(0, r1) > > > - REST_8GPRS(2, r1) > > > - REST_GPR(10, r1) > > > - ld r11,_CCR(r1) > > > - mtcr r11 > > > - REST_GPR(11, r1) > > > - REST_2GPRS(12, r1) > > > - /* restore original r1. */ > > > - ld r1,GPR1(r1) > > > - SET_SCRATCH0(r13) /* save r13 */ > > > - EXCEPTION_PROLOG_0(PACA_EXMC) > > > - b machine_check_pSeries_0 > > > -END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) > > > - > > > EXC_COMMON_BEGIN(machine_check_common) > > > /* > > > * Machine check is different because we use a different > > > @@ -483,6 +444,9 @@ EXC_COMMON_BEGIN(machine_check_handle_early) > > > bl machine_check_early > > > std r3,RESULT(r1) /* Save result */ > > > ld r12,_MSR(r1) > > > +BEGIN_FTR_SECTION > > > + bne 9f /* pSeries: continue > > > to V mode. */ +END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) > > > > Should this be "b 9f" ? Although... > > > > > > > > #ifdef CONFIG_PPC_P7_NAP > > > /* > > > @@ -564,7 +528,9 @@ EXC_COMMON_BEGIN(machine_check_handle_early) > > > 9: > > > /* Deliver the machine check to host kernel in V mode. */ > > > MACHINE_CHECK_HANDLER_WINDUP > > > - b machine_check_pSeries > > > + SET_SCRATCH0(r13) /* save r13 */ > > > + EXCEPTION_PROLOG_0(PACA_EXMC) > > > + b machine_check_pSeries_0 > > > > I'm not sure that's quite right. You're missing out testing the result > > of the early handler call? Is this buggy in existing code too? We > > should be testing that result in all cases, shouldn't we? But it > > doesn't seem like we are. > > At least for the pSeries case the result of realmode handler is stored > in the MCE log data. Both the real and virtual part of the handler > should be called in any case. They do different and independent things. Hmm, well the return code of the function in the powernv case is put into regs->result which is missing here, but I guess it gets picked up again when the pseries code is consolidated back with powernv. But... maybe that result is not actually used anywhere though. I guess that's okay, maybe we should just make it return void though. We want to avoid the case of going to virtual mode if we have errors in the SLB or TLB that causes a recursive MCE, but the recursion limit will eventually catch that and checkstop us which might be the sanest option. Thanks, Nick
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 0038596b7906..3e877ec55d50 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -243,14 +243,13 @@ EXC_REAL_BEGIN(machine_check, 0x200, 0x100) SET_SCRATCH0(r13) /* save r13 */ EXCEPTION_PROLOG_0(PACA_EXMC) BEGIN_FTR_SECTION - b machine_check_powernv_early + b machine_check_common_early FTR_SECTION_ELSE b machine_check_pSeries_0 ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE) EXC_REAL_END(machine_check, 0x200, 0x100) EXC_VIRT_NONE(0x4200, 0x100) -TRAMP_REAL_BEGIN(machine_check_powernv_early) -BEGIN_FTR_SECTION +TRAMP_REAL_BEGIN(machine_check_common_early) EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) /* * Register contents: @@ -306,7 +305,9 @@ BEGIN_FTR_SECTION /* Save r9 through r13 from EXMC save area to stack frame. */ EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) mfmsr r11 /* get MSR value */ +BEGIN_FTR_SECTION ori r11,r11,MSR_ME /* turn on ME bit */ +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) ori r11,r11,MSR_RI /* turn on RI bit */ LOAD_HANDLER(r12, machine_check_handle_early) 1: mtspr SPRN_SRR0,r12 @@ -325,7 +326,6 @@ BEGIN_FTR_SECTION andc r11,r11,r10 /* Turn off MSR_ME */ b 1b b . /* prevent speculative execution */ -END_FTR_SECTION_IFSET(CPU_FTR_HVMODE) TRAMP_REAL_BEGIN(machine_check_pSeries) .globl machine_check_fwnmi @@ -333,7 +333,7 @@ machine_check_fwnmi: SET_SCRATCH0(r13) /* save r13 */ EXCEPTION_PROLOG_0(PACA_EXMC) BEGIN_FTR_SECTION - b machine_check_pSeries_early + b machine_check_common_early END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) machine_check_pSeries_0: EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST_PR, 0x200) @@ -346,45 +346,6 @@ machine_check_pSeries_0: TRAMP_KVM_SKIP(PACA_EXMC, 0x200) -TRAMP_REAL_BEGIN(machine_check_pSeries_early) -BEGIN_FTR_SECTION - EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200) - mr r10,r1 /* Save r1 */ - ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */ - subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */ - mfspr r11,SPRN_SRR0 /* Save SRR0 */ - mfspr r12,SPRN_SRR1 /* Save SRR1 */ - EXCEPTION_PROLOG_COMMON_1() - EXCEPTION_PROLOG_COMMON_2(PACA_EXMC) - EXCEPTION_PROLOG_COMMON_3(0x200) - addi r3,r1,STACK_FRAME_OVERHEAD - BRANCH_LINK_TO_FAR(machine_check_early) /* Function call ABI */ - - /* Move original SRR0 and SRR1 into the respective regs */ - ld r9,_MSR(r1) - mtspr SPRN_SRR1,r9 - ld r3,_NIP(r1) - mtspr SPRN_SRR0,r3 - ld r9,_CTR(r1) - mtctr r9 - ld r9,_XER(r1) - mtxer r9 - ld r9,_LINK(r1) - mtlr r9 - REST_GPR(0, r1) - REST_8GPRS(2, r1) - REST_GPR(10, r1) - ld r11,_CCR(r1) - mtcr r11 - REST_GPR(11, r1) - REST_2GPRS(12, r1) - /* restore original r1. */ - ld r1,GPR1(r1) - SET_SCRATCH0(r13) /* save r13 */ - EXCEPTION_PROLOG_0(PACA_EXMC) - b machine_check_pSeries_0 -END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) - EXC_COMMON_BEGIN(machine_check_common) /* * Machine check is different because we use a different @@ -483,6 +444,9 @@ EXC_COMMON_BEGIN(machine_check_handle_early) bl machine_check_early std r3,RESULT(r1) /* Save result */ ld r12,_MSR(r1) +BEGIN_FTR_SECTION + bne 9f /* pSeries: continue to V mode. */ +END_FTR_SECTION_IFCLR(CPU_FTR_HVMODE) #ifdef CONFIG_PPC_P7_NAP /* @@ -564,7 +528,9 @@ EXC_COMMON_BEGIN(machine_check_handle_early) 9: /* Deliver the machine check to host kernel in V mode. */ MACHINE_CHECK_HANDLER_WINDUP - b machine_check_pSeries + SET_SCRATCH0(r13) /* save r13 */ + EXCEPTION_PROLOG_0(PACA_EXMC) + b machine_check_pSeries_0 EXC_COMMON_BEGIN(unrecover_mce) /* Invoke machine_check_exception to print MCE event and panic. */