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lib: sbi_ipi: Process self-IPIs in sbi_ipi_send()

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An IPI sent to the local hart can be processed directly instead of
triggering the IPI device. This is more efficient, and it avoids a
deadlock when the .sync callback is defined. Since interrupts are
disabled while handling an ecall, the IPI would not get delivered
until the next mret, but sbi_ipi_sync() is called before then.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Xiang W <wxjstz@126.com>
This commit is contained in:
Samuel Holland 2023-12-08 13:22:58 -08:00 • committed by Anup Patel
parent a894187e28
commit 446fa65eb5
1 changed files with 8 additions and 0 deletions
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8
lib/sbi/sbi_ipi.c
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@ -60,6 +60,14 @@ static int sbi_ipi_send(struct sbi_scratch *scratch, u32 remote_hartindex,
remote_hartindex, data);
if (ret != SBI_IPI_UPDATE_SUCCESS)
return ret;
} else if (scratch == remote_scratch) {
/*
* IPI events with an update() callback are expected to return
* SBI_IPI_UPDATE_BREAK for self-IPIs. For other events, check
* for self-IPI and execute the callback directly here.
*/
ipi_ops->process(scratch);
return 0;
}
/*