Hi,
On 2023/5/20 14:38, Jianmin Lv wrote:
In a dual-bridge system based ACPI, the IRQ on PCH PIC of
"In an ACPI-based dual-bridge system"?
Also what's "the IRQ on PCH PIC of each bridge", is it "IRQ of each bridge's PCH PIC"? Or did I misunderstand it?
each bridge 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 NFor 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 Signed-off-by: Jianmin Lv lvjianmin@loongson.cn Signed-off-by: liuyun liuyun@loongson.cn
What's the patch's proper authorship, Yun Liu or you? Based on the ordering of the tags it seems you should be the author, but Yun should be submitting (because their tag comes later, the patch should be flowing from your tree to theirs); otherwise they should be the author and the two signoff lines should be reversed.
drivers/irqchip/irq-loongson-pch-pic.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c index e5fe4d50be05..921c5c0190d1 100644 --- 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_init(void) 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_domain *parent, } 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);