LoongArch: Prepare to support multiple pch-pic and pch-msi irqdomain

For systems with two chipsets, there are two related pch-pic and
pch-msi irqdomains, each of which has the same node id as its
parent irqdomain. So we use a structure to mantain the relation
of node and it's parent irqdomain as pch irqdomin, the 'pci_segment'
field is only used to match the pci segment of a pci device when
setting msi irqdomain for the device.

struct acpi_vector_group {
        int node;
        int pci_segment;
        struct irq_domain *parent;
};

The field 'pci_segment' and 'node' are initialized from MCFG, and
the parent irqdomain driver will set field 'parent' by matching same
'node'.

Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1658314292-35346-7-git-send-email-lvjianmin@loongson.cn

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/loongarch/include/asm/irq.h b/arch/loongarch/include/asm/irq.h
index ace3ea6da72e..a2540d7c533d 100644
--- a/arch/loongarch/include/asm/irq.h
+++ b/arch/loongarch/include/asm/irq.h
@@ -48,6 +48,14 @@ void arch_trigger_cpumask_backtrace(const struct cpumask *mask, bool exclude_sel
 #define MAX_IO_PICS 2
 #define NR_IRQS	(64 + (256 * MAX_IO_PICS))
 
+struct acpi_vector_group {
+	int node;
+	int pci_segment;
+	struct irq_domain *parent;
+};
+extern struct acpi_vector_group pch_group[MAX_IO_PICS];
+extern struct acpi_vector_group msi_group[MAX_IO_PICS];
+
 #define CORES_PER_EIO_NODE	4
 
 #define LOONGSON_CPU_UART0_VEC		10 /* CPU UART0 */