From d0c0c9a13f682157e8610565b6125a31d24434bc Mon Sep 17 00:00:00 2001 From: Michael Neuling Date: Wed, 13 Feb 2013 16:21:38 +0000 Subject: [PATCH] powerpc: Add transactional memory unavaliable execption handler These should never happen since we always turn on MSR TM when in userspace. We don't do lazy TM. Hence if we hit this, we barf and kill the task as something's gone horribly wrong. Signed-off-by: Matt Evans Signed-off-by: Michael Neuling Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/exceptions-64s.S | 23 +++++++++++++++++++++++ arch/powerpc/kernel/traps.c | 21 +++++++++++++++++++++ 2 files changed, 44 insertions(+) diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index b9bcf21dbb11..c6b88c1f3ebd 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -336,6 +336,11 @@ vsx_unavailable_pSeries_1: EXCEPTION_PROLOG_0(PACA_EXGEN) b vsx_unavailable_pSeries + . = 0xf60 + SET_SCRATCH0(r13) + EXCEPTION_PROLOG_0(PACA_EXGEN) + b tm_unavailable_pSeries + #ifdef CONFIG_CBE_RAS STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202) @@ -550,6 +555,8 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20) STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40) + STD_EXCEPTION_PSERIES_OOL(0xf60, tm_unavailable) + KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60) /* * An interrupt came in while soft-disabled. We set paca->irq_happened, then: @@ -852,6 +859,12 @@ vsx_unavailable_relon_pSeries_1: EXCEPTION_PROLOG_0(PACA_EXGEN) b vsx_unavailable_relon_pSeries +tm_unavailable_relon_pSeries_1: + . = 0x4f60 + SET_SCRATCH0(r13) + EXCEPTION_PROLOG_0(PACA_EXGEN) + b tm_unavailable_relon_pSeries + STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint) #ifdef CONFIG_PPC_DENORMALISATION . = 0x5500 @@ -1201,6 +1214,15 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX) bl .vsx_unavailable_exception b .ret_from_except + .align 7 + .globl tm_unavailable_common +tm_unavailable_common: + EXCEPTION_PROLOG_COMMON(0xf60, PACA_EXGEN) + bl .save_nvgprs + addi r3,r1,STACK_FRAME_OVERHEAD + bl .tm_unavailable_exception + b .ret_from_except + .align 7 .globl __end_handlers __end_handlers: @@ -1220,6 +1242,7 @@ __end_handlers: STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor) STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable) STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable) + STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, tm_unavailable) #if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) /* diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c index bd5de5deaf51..f829e05d8b1b 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1168,6 +1168,27 @@ void vsx_unavailable_exception(struct pt_regs *regs) die("Unrecoverable VSX Unavailable Exception", regs, SIGABRT); } +void tm_unavailable_exception(struct pt_regs *regs) +{ + /* We restore the interrupt state now */ + if (!arch_irq_disabled_regs(regs)) + local_irq_enable(); + + /* Currently we never expect a TMU exception. Catch + * this and kill the process! + */ + printk(KERN_EMERG "Unexpected TM unavailable exception at %lx " + "(msr %lx)\n", + regs->nip, regs->msr); + + if (user_mode(regs)) { + _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); + return; + } + + die("Unexpected TM unavailable exception", regs, SIGABRT); +} + void performance_monitor_exception(struct pt_regs *regs) { __get_cpu_var(irq_stat).pmu_irqs++; -- GitLab