[PATCH] hw/loongarch/virt: rename PCH_PIC_IRQ_OFFSET with VIRT_GSI_BASE

[Bibo Mao]

In theory gsi base can start from 0 on loongarch virt machine,
however gsi base is hard-coded in linux kernel loongarch system,
else system fails to boot.

This patch renames macro PCH_PIC_IRQ_OFFSET with VIRT_GSI_BASE,
keeps value unchanged. GSI base is common concept in acpi spec
and easy to understand.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 hw/loongarch/acpi-build.c  |  2 +-
 hw/loongarch/virt.c        |  8 ++++----
 include/hw/pci-host/ls7a.h | 17 +++++++++--------
 3 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/hw/loongarch/acpi-build.c b/hw/loongarch/acpi-build.c
index c2b237736d..33e04e4b76 100644
--- a/hw/loongarch/acpi-build.c
+++ b/hw/loongarch/acpi-build.c
@@ -272,7 +272,7 @@ static void build_pci_device_aml(Aml *scope, 
LoongArchMachineState *lams)
         .pio.size    = VIRT_PCI_IO_SIZE,
         .ecam.base   = VIRT_PCI_CFG_BASE,
         .ecam.size   = VIRT_PCI_CFG_SIZE,
-        .irq         = PCH_PIC_IRQ_OFFSET + VIRT_DEVICE_IRQS,
+        .irq         = VIRT_GSI_BASE + VIRT_DEVICE_IRQS,
         .bus         = lams->pci_bus,
     };
 
diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index c8a495ea30..3754e2151f 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -432,7 +432,7 @@ static DeviceState *create_acpi_ged(DeviceState *pch_pic, 
LoongArchMachineState
     sysbus_mmio_map(SYS_BUS_DEVICE(dev), 2, VIRT_GED_REG_ADDR);
 
     sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0,
-                       qdev_get_gpio_in(pch_pic, VIRT_SCI_IRQ - 
PCH_PIC_IRQ_OFFSET));
+                       qdev_get_gpio_in(pch_pic, VIRT_SCI_IRQ - 
VIRT_GSI_BASE));
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
     return dev;
 }
@@ -452,7 +452,7 @@ static DeviceState *create_platform_bus(DeviceState 
*pch_pic)
 
     sysbus = SYS_BUS_DEVICE(dev);
     for (i = 0; i < VIRT_PLATFORM_BUS_NUM_IRQS; i++) {
-        irq = VIRT_PLATFORM_BUS_IRQ - PCH_PIC_IRQ_OFFSET + i;
+        irq = VIRT_PLATFORM_BUS_IRQ - VIRT_GSI_BASE + i;
         sysbus_connect_irq(sysbus, i, qdev_get_gpio_in(pch_pic, irq));
     }
 
@@ -509,7 +509,7 @@ static void loongarch_devices_init(DeviceState *pch_pic, 
LoongArchMachineState *
 
     serial_mm_init(get_system_memory(), VIRT_UART_BASE, 0,
                    qdev_get_gpio_in(pch_pic,
-                                    VIRT_UART_IRQ - PCH_PIC_IRQ_OFFSET),
+                                    VIRT_UART_IRQ - VIRT_GSI_BASE),
                    115200, serial_hd(0), DEVICE_LITTLE_ENDIAN);
     fdt_add_uart_node(lams);
 
@@ -531,7 +531,7 @@ static void loongarch_devices_init(DeviceState *pch_pic, 
LoongArchMachineState *
     create_unimplemented_device("pci-dma-cfg", 0x1001041c, 0x4);
     sysbus_create_simple("ls7a_rtc", VIRT_RTC_REG_BASE,
                          qdev_get_gpio_in(pch_pic,
-                         VIRT_RTC_IRQ - PCH_PIC_IRQ_OFFSET));
+                         VIRT_RTC_IRQ - VIRT_GSI_BASE));
     fdt_add_rtc_node(lams);
 
     pm_mem = g_new(MemoryRegion, 1);
diff --git a/include/hw/pci-host/ls7a.h b/include/hw/pci-host/ls7a.h
index df7fa55a30..194aac905e 100644
--- a/include/hw/pci-host/ls7a.h
+++ b/include/hw/pci-host/ls7a.h
@@ -28,24 +28,25 @@
 #define VIRT_PCH_MSI_ADDR_LOW    0x2FF00000UL
 
 /*
- * According to the kernel pch irq start from 64 offset
- * 0 ~ 16 irqs used for non-pci device while 16 ~ 64 irqs
- * used for pci device.
+ * GSI_BASE is hard-coded with 64 in linux kernel, else kernel fails to boot
+ * 0  - 15  GSI for ISA devices even if there is no ISA devices
+ * 16 - 63  GSI for CPU devices such as timers/perf monitor etc
+ * 64 -     GSI for external devices
  */
-#define PCH_PIC_IRQ_OFFSET       64
+#define VIRT_GSI_BASE            64
 #define VIRT_DEVICE_IRQS         16
 #define VIRT_PCI_IRQS            48
-#define VIRT_UART_IRQ            (PCH_PIC_IRQ_OFFSET + 2)
+#define VIRT_UART_IRQ            (VIRT_GSI_BASE + 2)
 #define VIRT_UART_BASE           0x1fe001e0
 #define VIRT_UART_SIZE           0X100
-#define VIRT_RTC_IRQ             (PCH_PIC_IRQ_OFFSET + 3)
+#define VIRT_RTC_IRQ             (VIRT_GSI_BASE + 3)
 #define VIRT_MISC_REG_BASE       (VIRT_PCH_REG_BASE + 0x00080000)
 #define VIRT_RTC_REG_BASE        (VIRT_MISC_REG_BASE + 0x00050100)
 #define VIRT_RTC_LEN             0x100
-#define VIRT_SCI_IRQ             (PCH_PIC_IRQ_OFFSET + 4)
+#define VIRT_SCI_IRQ             (VIRT_GSI_BASE + 4)
 
 #define VIRT_PLATFORM_BUS_BASEADDRESS   0x16000000
 #define VIRT_PLATFORM_BUS_SIZE          0x2000000
 #define VIRT_PLATFORM_BUS_NUM_IRQS      2
-#define VIRT_PLATFORM_BUS_IRQ           69
+#define VIRT_PLATFORM_BUS_IRQ           (VIRT_GSI_BASE + 5)
 #endif
-- 
2.27.0