From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Michael Neuling To: Benjamin Herrenschmidt Subject: [PATCH 10/17] powerpc: Add transactional memory unavaliable execption handler Date: Fri, 18 Jan 2013 16:48:30 +1100 Message-Id: <1358488117-17363-11-git-send-email-mikey@neuling.org> In-Reply-To: <1358488117-17363-1-git-send-email-mikey@neuling.org> References: <1358488117-17363-1-git-send-email-mikey@neuling.org> Cc: Michael Neuling , linuxppc-dev@lists.ozlabs.org, Matt Evans List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 --- arch/powerpc/kernel/exceptions-64s.S | 19 +++++++++++++++++++ arch/powerpc/kernel/traps.c | 21 +++++++++++++++++++++ 2 files changed, 40 insertions(+) diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index 7a1c87c..d0cc657 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -313,6 +313,9 @@ vsx_unavailable_pSeries_1: . = 0xf40 b vsx_unavailable_pSeries + . = 0xf60 + b tm_unavailable_pSeries + #ifdef CONFIG_CBE_RAS STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error) KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202) @@ -528,6 +531,8 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf20) STD_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable) KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf40) + STD_EXCEPTION_PSERIES(., 0xf60, tm_unavailable) + KVM_HANDLER_PR(PACA_EXGEN, EXC_STD, 0xf60) /* * An interrupt came in while soft-disabled. We set paca->irq_happened, then: @@ -817,6 +822,10 @@ vsx_unavailable_relon_pSeries_1: . = 0x4f40 b vsx_unavailable_relon_pSeries +tm_unavailable_relon_pSeries_1: + . = 0x4f60 + b tm_unavailable_relon_pSeries + #ifdef CONFIG_CBE_RAS STD_RELON_EXCEPTION_HV(0x5200, 0x1202, cbe_system_error) #endif /* CONFIG_CBE_RAS */ @@ -1177,6 +1186,15 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX) 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: @@ -1195,6 +1213,7 @@ __end_handlers: STD_RELON_EXCEPTION_PSERIES(., 0xf00, performance_monitor) STD_RELON_EXCEPTION_PSERIES(., 0xf20, altivec_unavailable) STD_RELON_EXCEPTION_PSERIES(., 0xf40, vsx_unavailable) + STD_RELON_EXCEPTION_PSERIES(., 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 2a62f54..dda0517 100644 --- a/arch/powerpc/kernel/traps.c +++ b/arch/powerpc/kernel/traps.c @@ -1171,6 +1171,27 @@ 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++; -- 1.7.10.4