diff options
| -rw-r--r-- | arch/powerpc/include/asm/opal-api.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/opal.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/opal-wrappers.S | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/setup.c | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/powernv/smp.c | 52 |
5 files changed, 57 insertions, 0 deletions
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 diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h index 726c23304a57..04c32b08ffa1 100644 --- a/arch/powerpc/include/asm/opal.h +++ b/arch/powerpc/include/asm/opal.h @@ -281,6 +281,8 @@ int opal_get_power_shift_ratio(u32 handle, int token, u32 *psr); int opal_set_power_shift_ratio(u32 handle, int token, u32 psr); int opal_sensor_group_clear(u32 group_hndl, int token); +s64 opal_signal_system_reset(s32 cpu); + /* Internal functions */ extern int early_init_dt_scan_opal(unsigned long node, const char *uname, int depth, void *data); diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S index 8c1ede2d3f7e..37cd170201a2 100644 --- a/arch/powerpc/platforms/powernv/opal-wrappers.S +++ b/arch/powerpc/platforms/powernv/opal-wrappers.S @@ -307,6 +307,7 @@ OPAL_CALL(opal_xive_get_vp_info, OPAL_XIVE_GET_VP_INFO); OPAL_CALL(opal_xive_set_vp_info, OPAL_XIVE_SET_VP_INFO); OPAL_CALL(opal_xive_sync, OPAL_XIVE_SYNC); OPAL_CALL(opal_xive_dump, OPAL_XIVE_DUMP); +OPAL_CALL(opal_signal_system_reset, OPAL_SIGNAL_SYSTEM_RESET); OPAL_CALL(opal_npu_init_context, OPAL_NPU_INIT_CONTEXT); OPAL_CALL(opal_npu_destroy_context, OPAL_NPU_DESTROY_CONTEXT); OPAL_CALL(opal_npu_map_lpar, OPAL_NPU_MAP_LPAR); diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c index 897aa1400eb8..cf52d53da460 100644 --- a/arch/powerpc/platforms/powernv/setup.c +++ b/arch/powerpc/platforms/powernv/setup.c @@ -282,6 +282,7 @@ static void __init pnv_setup_machdep_opal(void) ppc_md.restart = pnv_restart; pm_power_off = pnv_power_off; ppc_md.halt = pnv_halt; + /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */ ppc_md.machine_check_exception = opal_machine_check; ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery; ppc_md.hmi_exception_early = opal_hmi_exception_early; diff --git a/arch/powerpc/platforms/powernv/smp.c b/arch/powerpc/platforms/powernv/smp.c index 355d3f99cafb..ba030669eca1 100644 --- a/arch/powerpc/platforms/powernv/smp.c +++ b/arch/powerpc/platforms/powernv/smp.c @@ -297,6 +297,54 @@ static void __init pnv_smp_probe(void) } } +static int pnv_system_reset_exception(struct pt_regs *regs) +{ + if (smp_handle_nmi_ipi(regs)) + return 1; + return 0; +} + +static int pnv_cause_nmi_ipi(int cpu) +{ + int64_t rc; + + if (cpu >= 0) { + rc = opal_signal_system_reset(get_hard_smp_processor_id(cpu)); + if (rc != OPAL_SUCCESS) + return 0; + return 1; + + } else if (cpu == NMI_IPI_ALL_OTHERS) { + bool success = true; + int c; + + + /* + * We do not use broadcasts (yet), because it's not clear + * exactly what semantics Linux wants or the firmware should + * provide. + */ + for_each_online_cpu(c) { + if (c == smp_processor_id()) + continue; + + rc = opal_signal_system_reset( + get_hard_smp_processor_id(c)); + if (rc != OPAL_SUCCESS) + success = false; + } + if (success) + return 1; + + /* + * Caller will fall back to doorbells, which may pick + * up the remainders. + */ + } + + return 0; +} + static struct smp_ops_t pnv_smp_ops = { .message_pass = NULL, /* Use smp_muxed_ipi_message_pass */ .cause_ipi = NULL, /* Filled at runtime by pnv_smp_probe() */ @@ -315,6 +363,10 @@ static struct smp_ops_t pnv_smp_ops = { /* This is called very early during platform setup_arch */ void __init pnv_smp_init(void) { + if (opal_check_token(OPAL_SIGNAL_SYSTEM_RESET)) { + ppc_md.system_reset_exception = pnv_system_reset_exception; + pnv_smp_ops.cause_nmi_ipi = pnv_cause_nmi_ipi; + } smp_ops = &pnv_smp_ops; #ifdef CONFIG_HOTPLUG_CPU |