From: Jianmin Lv lvjianmin@loongson.cn
commit f679616565f1cf1a4acb245dbc0032dafcd40637 upstream.
In an ACPI-based dual-bridge system, IRQ of each bridge's PCH PIC sent to CPU is always a zero-based number, which means that the IRQ on PCH PIC of each bridge is mapped into vector range from 0 to 63 of upstream irqchip(e.g. EIOINTC).
EIOINTC N: [0 ... 63 | 64 ... 255] -------- ---------- ^ ^ | | PCH PIC N | PCH MSI N
For example, the IRQ vector number of sata controller on PCH PIC of each bridge is 16, which is sent to upstream irqchip of EIOINTC when an interrupt occurs, which will set bit 16 of EIOINTC. Since hwirq of 16 on EIOINTC has been mapped to a irq_desc for sata controller during hierarchy irq allocation, the related mapped IRQ will be found through irq_resolve_mapping() in the IRQ domain of EIOINTC.
So, the IRQ number set in HT vector register should be fixed to be a zero-based number.
Cc: stable@vger.kernel.org Reviewed-by: Huacai Chen chenhuacai@loongson.cn Co-developed-by: liuyun liuyun@loongson.cn Signed-off-by: liuyun liuyun@loongson.cn Signed-off-by: Jianmin Lv lvjianmin@loongson.cn Signed-off-by: Marc Zyngier maz@kernel.org Link: https://lore.kernel.org/r/20230614115936.5950-2-lvjianmin@loongson.cn Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/irqchip/irq-loongson-pch-pic.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
--- a/drivers/irqchip/irq-loongson-pch-pic.c +++ b/drivers/irqchip/irq-loongson-pch-pic.c @@ -401,14 +401,12 @@ static int __init acpi_cascade_irqdomain int __init pch_pic_acpi_init(struct irq_domain *parent, struct acpi_madt_bio_pic *acpi_pchpic) { - int ret, vec_base; + int ret; struct fwnode_handle *domain_handle;
if (find_pch_pic(acpi_pchpic->gsi_base) >= 0) return 0;
- vec_base = acpi_pchpic->gsi_base - GSI_MIN_PCH_IRQ; - domain_handle = irq_domain_alloc_fwnode(&acpi_pchpic->address); if (!domain_handle) { pr_err("Unable to allocate domain handle\n"); @@ -416,7 +414,7 @@ int __init pch_pic_acpi_init(struct irq_ }
ret = pch_pic_init(acpi_pchpic->address, acpi_pchpic->size, - vec_base, parent, domain_handle, acpi_pchpic->gsi_base); + 0, parent, domain_handle, acpi_pchpic->gsi_base);
if (ret < 0) { irq_domain_free_fwnode(domain_handle);