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irqchip/riscv-intc: Allow drivers to directly discover INTC hwnode

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Various RISC-V drivers (such as SBI IPI, SBI Timer, SBI PMU, and
KVM RISC-V) don't have associated DT node but these drivers need
standard per-CPU (local) interrupts defined by the RISC-V privileged
specification.

We add riscv_get_intc_hwnode() in arch/riscv which allows RISC-V
drivers not having DT node to discover INTC hwnode which in-turn
helps these drivers to map per-CPU (local) interrupts provided
by the INTC driver.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230328035223.1480939-3-apatel@ventanamicro.com
This commit is contained in:
Anup Patel 2023-03-28 09:22:18 +05:30 committed by Marc Zyngier
parent 3ee92565b8
commit 0c60a31ce6
3 changed files with 29 additions and 0 deletions
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4
arch/riscv/include/asm/irq.h
View File

@ -12,6 +12,10 @@
#include <asm-generic/irq.h>
void riscv_set_intc_hwnode_fn(struct fwnode_handle *(*fn)(void));
struct fwnode_handle *riscv_get_intc_hwnode(void);
extern void __init init_IRQ(void);
#endif /* _ASM_RISCV_IRQ_H */

18
arch/riscv/kernel/irq.c
View File

@ -7,9 +7,27 @@
#include <linux/interrupt.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <asm/smp.h>
static struct fwnode_handle *(*__get_intc_node)(void);
void riscv_set_intc_hwnode_fn(struct fwnode_handle *(*fn)(void))
{
__get_intc_node = fn;
}
struct fwnode_handle *riscv_get_intc_hwnode(void)
{
if (__get_intc_node)
return __get_intc_node();
return NULL;
}
EXPORT_SYMBOL_GPL(riscv_get_intc_hwnode);
int arch_show_interrupts(struct seq_file *p, int prec)
{
show_ipi_stats(p, prec);

7
drivers/irqchip/irq-riscv-intc.c
View File

@ -92,6 +92,11 @@ static const struct irq_domain_ops riscv_intc_domain_ops = {
.xlate = irq_domain_xlate_onecell,
};
static struct fwnode_handle *riscv_intc_hwnode(void)
{
return intc_domain->fwnode;
}
static int __init riscv_intc_init(struct device_node *node,
struct device_node *parent)
{
@ -126,6 +131,8 @@ static int __init riscv_intc_init(struct device_node *node,
return rc;
}
riscv_set_intc_hwnode_fn(riscv_intc_hwnode);
cpuhp_setup_state(CPUHP_AP_IRQ_RISCV_STARTING,
"irqchip/riscv/intc:starting",
riscv_intc_cpu_starting,