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lib: sbi: Use AIA CSRs for local interrupts when available

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We should use AIA CSRs to process local interrupts whenever AIA
is available.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2021-04-06 16:10:00 +05:30
committed by Anup Patel
parent 8f96070067
commit 65b4c7c01e
1 changed files with 46 additions and 11 deletions
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57
lib/sbi/sbi_trap.c
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@@ -195,6 +195,44 @@ int sbi_trap_redirect(struct sbi_trap_regs *regs,
return 0;
}
static int sbi_trap_nonaia_irq(struct sbi_trap_regs *regs, ulong mcause)
{
mcause &= ~(1UL << (__riscv_xlen - 1));
switch (mcause) {
case IRQ_M_TIMER:
sbi_timer_process();
break;
case IRQ_M_SOFT:
sbi_ipi_process();
break;
default:
return SBI_ENOENT;
};
return 0;
}
static int sbi_trap_aia_irq(struct sbi_trap_regs *regs, ulong mcause)
{
unsigned long mtopi;
while ((mtopi = csr_read(CSR_MTOPI))) {
mtopi = mtopi >> TOPI_IID_SHIFT;
switch (mtopi) {
case IRQ_M_TIMER:
sbi_timer_process();
break;
case IRQ_M_SOFT:
sbi_ipi_process();
break;
default:
return SBI_ENOENT;
}
}
return 0;
}
/**
* Handle trap/interrupt
*
@@ -225,18 +263,15 @@ struct sbi_trap_regs *sbi_trap_handler(struct sbi_trap_regs *regs)
}
if (mcause & (1UL << (__riscv_xlen - 1))) {
mcause &= ~(1UL << (__riscv_xlen - 1));
switch (mcause) {
case IRQ_M_TIMER:
sbi_timer_process();
break;
case IRQ_M_SOFT:
sbi_ipi_process();
break;
default:
msg = "unhandled external interrupt";
if (sbi_hart_has_feature(sbi_scratch_thishart_ptr(),
SBI_HART_HAS_AIA))
rc = sbi_trap_aia_irq(regs, mcause);
else
rc = sbi_trap_nonaia_irq(regs, mcause);
if (rc) {
msg = "unhandled local interrupt";
goto trap_error;
};
}
return regs;
}