diff options
| -rw-r--r-- | lib/sbi/sbi_ipi.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/lib/sbi/sbi_ipi.c b/lib/sbi/sbi_ipi.c index 0bf446a0..5c33a78b 100644 --- a/lib/sbi/sbi_ipi.c +++ b/lib/sbi/sbi_ipi.c @@ -39,7 +39,7 @@ static const struct sbi_ipi_event_ops *ipi_ops_array[SBI_IPI_EVENT_MAX]; static int sbi_ipi_send(struct sbi_scratch *scratch, u32 remote_hartindex, u32 event, void *data) { - int ret; + int ret = 0; struct sbi_scratch *remote_scratch = NULL; struct sbi_ipi_data *ipi_data; const struct sbi_ipi_event_ops *ipi_ops; @@ -64,11 +64,15 @@ static int sbi_ipi_send(struct sbi_scratch *scratch, u32 remote_hartindex, /* * Set IPI type on remote hart's scratch area and - * trigger the interrupt + * trigger the interrupt. + * + * Multiple harts may be trying to send IPI to the + * remote hart so call sbi_ipi_raw_send() only when + * the ipi_type was previously zero. */ - atomic_raw_set_bit(event, &ipi_data->ipi_type); - - ret = sbi_ipi_raw_send(remote_hartindex); + if (!__atomic_fetch_or(&ipi_data->ipi_type, + BIT(event), __ATOMIC_RELAXED)) + ret = sbi_ipi_raw_send(remote_hartindex); sbi_pmu_ctr_incr_fw(SBI_PMU_FW_IPI_SENT); |