Currently, the implementation of the RISC-V INTC driver uses the interrupt cause as hwirq and has a limitation of supporting a maximum of 64 hwirqs. However, according to the privileged spec, interrupt causes >= 16 are defined for platform use. This limitation prevents us from fully utilizing the available local interrupt sources. Additionally, the hwirqs used on RISC-V are sparse, with only interrupt numbers 1, 5 and 9 (plus Sscofpmf or T-Head's PMU irq) being currently used for supervisor mode. Switch to using irq_domain_create_tree() to create the radix tree map, so a larger number of hardware interrupts can be handled. Signed-off-by: Yu Chien Peter Lin <peterlin@xxxxxxxxxxxxx> Reviewed-by: Charles Ci-Jyun Wu <dminus@xxxxxxxxxxxxx> Reviewed-by: Leo Yu-Chi Liang <ycliang@xxxxxxxxxxxxx> --- Changes v1 -> v2: - Fixed irq mapping failure checking (suggested by Clément and Anup) Changes v2 -> v3: - No change Changes v3 -> v4: (Suggested by Thomas [1]) - Use pr_warn_ratelimited instead - Fix coding style and commit message [1] https://patchwork.kernel.org/project/linux-riscv/patch/20231023004100.2663486-3-peterlin@xxxxxxxxxxxxx/#25573085 --- drivers/irqchip/irq-riscv-intc.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c index e8d01b14ccdd..2fdd40f2a791 100644 --- a/drivers/irqchip/irq-riscv-intc.c +++ b/drivers/irqchip/irq-riscv-intc.c @@ -24,10 +24,9 @@ static asmlinkage void riscv_intc_irq(struct pt_regs *regs) { unsigned long cause = regs->cause & ~CAUSE_IRQ_FLAG; - if (unlikely(cause >= BITS_PER_LONG)) - panic("unexpected interrupt cause"); - - generic_handle_domain_irq(intc_domain, cause); + if (generic_handle_domain_irq(intc_domain, cause)) + pr_warn_ratelimited("Failed to handle interrupt (cause: %ld)\n", + cause); } /* @@ -117,8 +116,7 @@ static int __init riscv_intc_init_common(struct fwnode_handle *fn) { int rc; - intc_domain = irq_domain_create_linear(fn, BITS_PER_LONG, - &riscv_intc_domain_ops, NULL); + intc_domain = irq_domain_create_tree(fn, &riscv_intc_domain_ops, NULL); if (!intc_domain) { pr_err("unable to add IRQ domain\n"); return -ENXIO; @@ -132,8 +130,6 @@ static int __init riscv_intc_init_common(struct fwnode_handle *fn) riscv_set_intc_hwnode_fn(riscv_intc_hwnode); - pr_info("%d local interrupts mapped\n", BITS_PER_LONG); - return 0; } -- 2.34.1
