On Wed, 04 Jul 2018 23:30:12 +0530 Mahesh J Salgaonkar <mah...@linux.vnet.ibm.com> wrote:
> From: Mahesh Salgaonkar <mah...@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 <mah...@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
