Re: [PATCH v5 08/11] hw/loongarch: Implement avec set irq

[Bibo Mao]

On 2025/7/11 下午4:59, Song Gao wrote:
Implement avec set irq and update CSR_MSIS.

Signed-off-by: Song Gao <gaos...@loongson.cn>
---
  hw/intc/loongarch_avec.c | 34 ++++++++++++++++++++++++++++++++--
  1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/hw/intc/loongarch_avec.c b/hw/intc/loongarch_avec.c
index 1f9f376898..af6c75c4a9 100644
--- a/hw/intc/loongarch_avec.c
+++ b/hw/intc/loongarch_avec.c
@@ -16,6 +16,12 @@
  #include "migration/vmstate.h"
  #include "trace.h"
  #include "hw/qdev-properties.h"
+#include "target/loongarch/cpu.h"
+
+/* msg addr field */
+FIELD(MSG_ADDR, IRQ_NUM, 4, 8)
+FIELD(MSG_ADDR, CPU_NUM, 12, 8)
+FIELD(MSG_ADDR, FIX, 28, 12)
  
  static uint64_t loongarch_avec_mem_read(void *opaque,
                                          hwaddr addr, unsigned size)
@@ -23,12 +29,36 @@ static uint64_t loongarch_avec_mem_read(void *opaque,
      return 0;
  }
  
+static void avec_set_irq(LoongArchAVECState *s, int cpu_num, int irq_num, int level)
+{
+    MachineState *machine = MACHINE(qdev_get_machine());
+    MachineClass *mc = MACHINE_GET_CLASS(machine);
+    const CPUArchIdList *id_list = NULL;
+    CPUState *cpu;
+    CPULoongArchState *env;
+
+    assert(mc->possible_cpu_arch_ids(machine));
+    id_list = mc->possible_cpu_arch_ids(machine);
+    cpu = id_list->cpus[cpu_num].cpu;
+    env = &LOONGARCH_CPU(cpu)->env;
+
+    if (level) {
+        set_bit(irq_num, &env->CSR_MSGIS[irq_num / 64]);
+    }
+    qemu_set_irq(s->cpu[cpu_num].parent_irq, level);
+}
+
  static void loongarch_avec_mem_write(void *opaque, hwaddr addr,
                                       uint64_t val, unsigned size)
  {
-    return;
-}
+    int irq_num, cpu_num = 0;
+    LoongArchAVECState *s = LOONGARCH_AVEC(opaque);
+    uint64_t msg_addr = addr + VIRT_AVEC_BASE;
  
+    cpu_num = FIELD_EX64(msg_addr, MSG_ADDR, CPU_NUM);
Here is physical cpuid rather than logic cpu index. We need convert 
physical cpuid to logic cpu index.

Regards
Bibo Mao
+    irq_num = FIELD_EX64(msg_addr, MSG_ADDR, IRQ_NUM);
+    avec_set_irq(s, cpu_num, irq_num, 1);
+}
  
  static const MemoryRegionOps loongarch_avec_ops = {
      .read = loongarch_avec_mem_read,