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-rw-r--r--arch/powerpc/include/asm/opal-api.h10
-rw-r--r--arch/powerpc/include/asm/opal.h2
-rw-r--r--arch/powerpc/include/asm/time.h2
-rw-r--r--arch/powerpc/kernel/time.c9
-rw-r--r--arch/powerpc/platforms/powernv/opal-call.c1
-rw-r--r--arch/powerpc/platforms/powernv/opal.c21
-rw-r--r--arch/powerpc/platforms/powernv/setup.c5
7 files changed, 49 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index e1d118ac61dc..234fde15b37c 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -209,6 +209,7 @@
#define OPAL_SENSOR_GROUP_ENABLE 163
#define OPAL_PCI_GET_PBCQ_TUNNEL_BAR 164
#define OPAL_PCI_SET_PBCQ_TUNNEL_BAR 165
+#define OPAL_HANDLE_HMI2 166
#define OPAL_NX_COPROC_INIT 167
#define OPAL_XIVE_GET_VP_STATE 170
#define OPAL_LAST 170
@@ -635,6 +636,15 @@ struct OpalHMIEvent {
} u;
};
+/* OPAL_HANDLE_HMI2 out_flags */
+enum {
+ OPAL_HMI_FLAGS_TB_RESYNC = (1ull << 0), /* Timebase has been resynced */
+ OPAL_HMI_FLAGS_DEC_LOST = (1ull << 1), /* DEC lost, needs to be reprogrammed */
+ OPAL_HMI_FLAGS_HDEC_LOST = (1ull << 2), /* HDEC lost, needs to be reprogrammed */
+ OPAL_HMI_FLAGS_TOD_TB_FAIL = (1ull << 3), /* TOD/TB recovery failed. */
+ OPAL_HMI_FLAGS_NEW_EVENT = (1ull << 63), /* An event has been created */
+};
+
enum {
OPAL_P7IOC_DIAG_TYPE_NONE = 0,
OPAL_P7IOC_DIAG_TYPE_RGC = 1,
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 4e978d4dea5c..4cc37e708bc7 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -203,6 +203,7 @@ int64_t opal_set_param(uint64_t token, uint32_t param_id, uint64_t buffer,
int64_t opal_sensor_read(uint32_t sensor_hndl, int token, __be32 *sensor_data);
int64_t opal_sensor_read_u64(u32 sensor_hndl, int token, __be64 *sensor_data);
int64_t opal_handle_hmi(void);
+int64_t opal_handle_hmi2(__be64 *out_flags);
int64_t opal_register_dump_region(uint32_t id, uint64_t start, uint64_t end);
int64_t opal_unregister_dump_region(uint32_t id);
int64_t opal_slw_set_reg(uint64_t cpu_pir, uint64_t sprn, uint64_t val);
@@ -359,6 +360,7 @@ int opal_power_control_init(void);
extern int opal_machine_check(struct pt_regs *regs);
extern bool opal_mce_check_early_recovery(struct pt_regs *regs);
extern int opal_hmi_exception_early(struct pt_regs *regs);
+extern int opal_hmi_exception_early2(struct pt_regs *regs);
extern int opal_handle_hmi_exception(struct pt_regs *regs);
extern void opal_shutdown(void);
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index 54bf7e68a7e1..57e968413d1e 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -36,6 +36,8 @@ extern unsigned long ppc_proc_freq;
extern unsigned long ppc_tb_freq;
#define DEFAULT_TB_FREQ 125000000UL
+extern bool tb_invalid;
+
struct div_result {
u64 result_high;
u64 result_low;
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 6ef32472ee1d..325d60633dfa 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -150,6 +150,8 @@ EXPORT_SYMBOL_GPL(ppc_proc_freq);
unsigned long ppc_tb_freq;
EXPORT_SYMBOL_GPL(ppc_tb_freq);
+bool tb_invalid;
+
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
/*
* Factor for converting from cputime_t (timebase ticks) to
@@ -459,6 +461,13 @@ void __delay(unsigned long loops)
diff += 1000000000;
spin_cpu_relax();
} while (diff < loops);
+ } else if (tb_invalid) {
+ /*
+ * TB is in error state and isn't ticking anymore.
+ * HMI handler was unable to recover from TB error.
+ * Return immediately, so that kernel won't get stuck here.
+ */
+ spin_cpu_relax();
} else {
start = get_tbl();
while (get_tbl() - start < loops)
diff --git a/arch/powerpc/platforms/powernv/opal-call.c b/arch/powerpc/platforms/powernv/opal-call.c
index 7cba0d5da3ff..36c8fa3647a2 100644
--- a/arch/powerpc/platforms/powernv/opal-call.c
+++ b/arch/powerpc/platforms/powernv/opal-call.c
@@ -220,6 +220,7 @@ OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ);
OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
OPAL_CALL(opal_handle_hmi, OPAL_HANDLE_HMI);
+OPAL_CALL(opal_handle_hmi2, OPAL_HANDLE_HMI2);
OPAL_CALL(opal_config_cpu_idle_state, OPAL_CONFIG_CPU_IDLE_STATE);
OPAL_CALL(opal_slw_set_reg, OPAL_SLW_SET_REG);
OPAL_CALL(opal_register_dump_region, OPAL_REGISTER_DUMP_REGION);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 737c51d63480..f2b063b027f0 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -614,6 +614,27 @@ int opal_hmi_exception_early(struct pt_regs *regs)
return 0;
}
+int opal_hmi_exception_early2(struct pt_regs *regs)
+{
+ s64 rc;
+ __be64 out_flags;
+
+ /*
+ * call opal hmi handler.
+ * Check 64-bit flag mask to find out if an event was generated,
+ * and whether TB is still valid or not etc.
+ */
+ rc = opal_handle_hmi2(&out_flags);
+ if (rc != OPAL_SUCCESS)
+ return 0;
+
+ if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_NEW_EVENT)
+ local_paca->hmi_event_available = 1;
+ if (be64_to_cpu(out_flags) & OPAL_HMI_FLAGS_TOD_TB_FAIL)
+ tb_invalid = true;
+ return 1;
+}
+
/* HMI exception handler called in virtual mode during check_irq_replay. */
int opal_handle_hmi_exception(struct pt_regs *regs)
{
diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 14befee4b3f1..3cf40f689aac 100644
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -401,7 +401,10 @@ static void __init pnv_setup_machdep_opal(void)
/* 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;
+ if (opal_check_token(OPAL_HANDLE_HMI2))
+ ppc_md.hmi_exception_early = opal_hmi_exception_early2;
+ else
+ ppc_md.hmi_exception_early = opal_hmi_exception_early;
ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
}