From e36d0a2ed5019184bb9b94ff1138c87c05905789 Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Fri, 29 Sep 2017 13:29:42 +1000 Subject: powerpc/powernv: Implement NMI IPI with OPAL_SIGNAL_SYSTEM_RESET This allows MSR[EE]=0 lockups to be detected on an OPAL (bare metal) system similarly to the hcall NMI IPI on pseries guests, when the platform/firmware supports it. This is an example of CPU10 spinning with interrupts hard disabled: Watchdog CPU:32 detected Hard LOCKUP other CPUS:10 Watchdog CPU:10 Hard LOCKUP CPU: 10 PID: 4410 Comm: bash Not tainted 4.13.0-rc7-00074-ge89ce1f89f62-dirty #34 task: c0000003a82b4400 task.stack: c0000003af55c000 NIP: c0000000000a7b38 LR: c000000000659044 CTR: c0000000000a7b00 REGS: c00000000fd23d80 TRAP: 0100 Not tainted (4.13.0-rc7-00074-ge89ce1f89f62-dirty) MSR: 90000000000c1033 CR: 28422222 XER: 20000000 CFAR: c0000000000a7b38 SOFTE: 0 GPR00: c000000000659044 c0000003af55fbb0 c000000001072a00 0000000000000078 GPR04: c0000003c81b5c80 c0000003c81cc7e8 9000000000009033 0000000000000000 GPR08: 0000000000000000 c0000000000a7b00 0000000000000001 9000000000001003 GPR12: c0000000000a7b00 c00000000fd83200 0000000010180df8 0000000010189e60 GPR16: 0000000010189ed8 0000000010151270 000000001018bd88 000000001018de78 GPR20: 00000000370a0668 0000000000000001 00000000101645e0 0000000010163c10 GPR24: 00007fffd14d6294 00007fffd14d6290 c000000000fba6f0 0000000000000004 GPR28: c000000000f351d8 0000000000000078 c000000000f4095c 0000000000000000 NIP [c0000000000a7b38] sysrq_handle_xmon+0x38/0x40 LR [c000000000659044] __handle_sysrq+0xe4/0x270 Call Trace: [c0000003af55fbd0] [c000000000659044] __handle_sysrq+0xe4/0x270 [c0000003af55fc70] [c000000000659810] write_sysrq_trigger+0x70/0xa0 [c0000003af55fca0] [c0000000003da650] proc_reg_write+0xb0/0x110 [c0000003af55fcf0] [c0000000003423bc] __vfs_write+0x6c/0x1b0 [c0000003af55fd90] [c000000000344398] vfs_write+0xd8/0x240 [c0000003af55fde0] [c00000000034632c] SyS_write+0x6c/0x110 [c0000003af55fe30] [c00000000000b220] system_call+0x58/0x6c Signed-off-by: Nicholas Piggin [mpe: Use kernel types for opal_signal_system_reset()] Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/opal-api.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/powerpc/include/asm/opal-api.h') diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h index 450a60b81d2a..9d191ebea706 100644 --- a/arch/powerpc/include/asm/opal-api.h +++ b/arch/powerpc/include/asm/opal-api.h @@ -188,6 +188,7 @@ #define OPAL_XIVE_DUMP 142 #define OPAL_XIVE_RESERVED3 143 #define OPAL_XIVE_RESERVED4 144 +#define OPAL_SIGNAL_SYSTEM_RESET 145 #define OPAL_NPU_INIT_CONTEXT 146 #define OPAL_NPU_DESTROY_CONTEXT 147 #define OPAL_NPU_MAP_LPAR 148 -- cgit From 54820530c5faa9fd78e1c08cb6449100b1a19157 Mon Sep 17 00:00:00 2001 From: Michael Ellerman Date: Thu, 12 Oct 2017 21:17:18 +1100 Subject: powerpc/powernv: Enable TM without suspend if possible Some Power9 revisions can run in a mode where TM operates without suspended state. If we find ourself on a CPU that might be in this mode, we query OPAL to check, and if so we reenable TM in CPU features, and enable a new user feature to signal to userspace that we are in this mode. We do not enable the "normal" user feature, PPC_FEATURE2_HTM, but we do enable PPC_FEATURE2_HTM_NOSC because that indicates to userspace that the kernel will abort transactions on syscall entry, which is true regardless of the suspend mode. Signed-off-by: Michael Ellerman --- arch/powerpc/include/asm/opal-api.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'arch/powerpc/include/asm/opal-api.h') diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h index 9d191ebea706..233c7504b1f2 100644 --- a/arch/powerpc/include/asm/opal-api.h +++ b/arch/powerpc/include/asm/opal-api.h @@ -896,6 +896,8 @@ enum { */ OPAL_REINIT_CPUS_MMU_HASH = (1 << 2), OPAL_REINIT_CPUS_MMU_RADIX = (1 << 3), + + OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED = (1 << 4), }; typedef struct oppanel_line { -- cgit