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lib: sbi: Add sbi_trap_set_external_irqfn() API

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This patch adds sbi_trap_set_external_irqfn() API which can be used by
OpenSBI platform code to set a callback function for external interrupts.
The RISC-V AIA IMSIC driver will use this API to implement inter-processor
interrupts on-top-of MSIs.

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 17:07:42 +05:30
committed by Anup Patel
parent 65b4c7c01e
commit 222132f48c
2 changed files with 31 additions and 0 deletions
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2
include/sbi/sbi_trap.h
View File

@@ -205,6 +205,8 @@ struct sbi_trap_info {
int sbi_trap_redirect(struct sbi_trap_regs *regs,
struct sbi_trap_info *trap);
void sbi_trap_set_external_irqfn(int (*fn)(struct sbi_trap_regs *regs));
struct sbi_trap_regs *sbi_trap_handler(struct sbi_trap_regs *regs);
void __noreturn sbi_trap_exit(const struct sbi_trap_regs *regs);

29
lib/sbi/sbi_trap.c
View File

@@ -195,6 +195,27 @@ int sbi_trap_redirect(struct sbi_trap_regs *regs,
return 0;
}
static int default_irqfn(struct sbi_trap_regs *regs)
{
return SBI_ENODEV;
}
static int (*ext_irqfn)(struct sbi_trap_regs *regs) = default_irqfn;
/**
* Set external irq handler function
*
* This function is called by OpenSBI platform code to set a handler for
* external interrupts
*
* @param fn function pointer for handling external irqs
*/
void sbi_trap_set_external_irqfn(int (*fn)(struct sbi_trap_regs *regs))
{
if (fn)
ext_irqfn = fn;
}
static int sbi_trap_nonaia_irq(struct sbi_trap_regs *regs, ulong mcause)
{
mcause &= ~(1UL << (__riscv_xlen - 1));
@@ -205,6 +226,8 @@ static int sbi_trap_nonaia_irq(struct sbi_trap_regs *regs, ulong mcause)
case IRQ_M_SOFT:
sbi_ipi_process();
break;
case IRQ_M_EXT:
return ext_irqfn(regs);
default:
return SBI_ENOENT;
};
@@ -214,6 +237,7 @@ static int sbi_trap_nonaia_irq(struct sbi_trap_regs *regs, ulong mcause)
static int sbi_trap_aia_irq(struct sbi_trap_regs *regs, ulong mcause)
{
int rc;
unsigned long mtopi;
while ((mtopi = csr_read(CSR_MTOPI))) {
@@ -225,6 +249,11 @@ static int sbi_trap_aia_irq(struct sbi_trap_regs *regs, ulong mcause)
case IRQ_M_SOFT:
sbi_ipi_process();
break;
case IRQ_M_EXT:
rc = ext_irqfn(regs);
if (rc)
return rc;
break;
default:
return SBI_ENOENT;
}