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lib: sbi: Prevent redundant sbi_ipi_process

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Multiple harts may try to send IPI to a particular target hart A
in which case the send_ipi() should be called only when the old
value of the hart A ipi_type is zero.

Signed-off-by: Xiang W <wxjstz@126.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Xiang W
2023-11-22 20:54:38 +08:00
committed by Anup Patel
parent 88398696c8
commit 07419ec84b
1 changed files with 9 additions and 5 deletions
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14
lib/sbi/sbi_ipi.c
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@@ -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);