[PATCH 04/13] lib: sbi: Add sbi_trap_set_external_irqfn() API
Anup Patel
apatel at ventanamicro.com
Tue Jan 4 02:13:14 PST 2022
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 at wdc.com>
Signed-off-by: Anup Patel <apatel at ventanamicro.com>
---
include/sbi/sbi_trap.h | 2 ++
lib/sbi/sbi_trap.c | 29 +++++++++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/include/sbi/sbi_trap.h b/include/sbi/sbi_trap.h
index d205056..4f611fa 100644
--- a/include/sbi/sbi_trap.h
+++ b/include/sbi/sbi_trap.h
@@ -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);
diff --git a/lib/sbi/sbi_trap.c b/lib/sbi/sbi_trap.c
index bc8961f..faab90a 100644
--- a/lib/sbi/sbi_trap.c
+++ b/lib/sbi/sbi_trap.c
@@ -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;
}
--
2.25.1
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