[PATCH 3/4] hw/mips/loongson3_virt: Wire up loongarch_ipi device

[Jiaxun Yang]

Wire up loongarch_ipi device for loongson3_virt machine, so we
can have SMP support for TCG backend as well.

Signed-off-by: Jiaxun Yang <jiaxun.y...@flygoat.com>
---
 hw/mips/Kconfig           |  1 +
 hw/mips/loongson3_bootp.c |  2 --
 hw/mips/loongson3_bootp.h |  3 +++
 hw/mips/loongson3_virt.c  | 20 ++++++++++++++++++--
 4 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/hw/mips/Kconfig b/hw/mips/Kconfig
index da3a37e215ec..7cb6c1def16c 100644
--- a/hw/mips/Kconfig
+++ b/hw/mips/Kconfig
@@ -40,6 +40,7 @@ config LOONGSON3V
     imply QXL if SPICE
     select SERIAL
     select GOLDFISH_RTC
+    select LOONGARCH_IPI
     select LOONGSON_LIOINTC
     select PCI_DEVICES
     select PCI_EXPRESS_GENERIC_BRIDGE
diff --git a/hw/mips/loongson3_bootp.c b/hw/mips/loongson3_bootp.c
index f99af229327a..474d3556b2e5 100644
--- a/hw/mips/loongson3_bootp.c
+++ b/hw/mips/loongson3_bootp.c
@@ -25,8 +25,6 @@
 #include "hw/boards.h"
 #include "hw/mips/loongson3_bootp.h"
 
-#define LOONGSON3_CORE_PER_NODE 4
-
 static void init_cpu_info(void *g_cpuinfo, uint64_t cpu_freq)
 {
     struct efi_cpuinfo_loongson *c = g_cpuinfo;
diff --git a/hw/mips/loongson3_bootp.h b/hw/mips/loongson3_bootp.h
index d525ab745a69..55f98858a5f4 100644
--- a/hw/mips/loongson3_bootp.h
+++ b/hw/mips/loongson3_bootp.h
@@ -200,6 +200,8 @@ struct boot_params {
     struct efi_reset_system_t reset_system;
 };
 
+#define LOONGSON3_CORE_PER_NODE 4
+
 /* Overall MMIO & Memory layout */
 enum {
     VIRT_LOWMEM,
@@ -211,6 +213,7 @@ enum {
     VIRT_BIOS_ROM,
     VIRT_UART,
     VIRT_LIOINTC,
+    VIRT_IPI,
     VIRT_PCIE_MMIO,
     VIRT_HIGHMEM
 };
diff --git a/hw/mips/loongson3_virt.c b/hw/mips/loongson3_virt.c
index 25534288dd81..a57245012598 100644
--- a/hw/mips/loongson3_virt.c
+++ b/hw/mips/loongson3_virt.c
@@ -38,6 +38,7 @@
 #include "hw/mips/loongson3_bootp.h"
 #include "hw/misc/unimp.h"
 #include "hw/intc/i8259.h"
+#include "hw/intc/loongarch_ipi.h"
 #include "hw/loader.h"
 #include "hw/isa/superio.h"
 #include "hw/pci/msi.h"
@@ -76,6 +77,7 @@ const MemMapEntry virt_memmap[] = {
     [VIRT_PCIE_ECAM] =   { 0x1a000000,     0x2000000 },
     [VIRT_BIOS_ROM] =    { 0x1fc00000,      0x200000 },
     [VIRT_UART] =        { 0x1fe001e0,           0x8 },
+    [VIRT_IPI] =         { 0x3ff01000,         0x400 },
     [VIRT_LIOINTC] =     { 0x3ff01400,          0x64 },
     [VIRT_PCIE_MMIO] =   { 0x40000000,    0x40000000 },
     [VIRT_HIGHMEM] =     { 0x80000000,           0x0 }, /* Variable */
@@ -529,6 +531,8 @@ static void mips_loongson3_virt_init(MachineState *machine)
     clock_set_hz(cpuclk, DEF_LOONGSON3_FREQ);
 
     for (i = 0; i < machine->smp.cpus; i++) {
+        int node = i / LOONGSON3_CORE_PER_NODE;
+        int core = i % LOONGSON3_CORE_PER_NODE;
         int ip;
 
         /* init CPUs */
@@ -539,12 +543,24 @@ static void mips_loongson3_virt_init(MachineState 
*machine)
         cpu_mips_clock_init(cpu);
         qemu_register_reset(main_cpu_reset, cpu);
 
-        if (i >= 4) {
+        /* IPI controller is in kernel for KVM */
+        if (!kvm_enabled()) {
+            DeviceState *ipi;
+
+            hwaddr base = ((hwaddr)node << 44) + virt_memmap[VIRT_IPI].base;
+            base += core * 0x100;
+            ipi = qdev_new(TYPE_LOONGARCH_IPI);
+            sysbus_realize_and_unref(SYS_BUS_DEVICE(ipi), &error_fatal);
+            qdev_connect_gpio_out(ipi, 0, cpu->env.irq[6]);
+            sysbus_mmio_map(SYS_BUS_DEVICE(ipi), 0, base);
+        }
+
+        if (node > 0) {
             continue; /* Only node-0 can be connected to LIOINTC */
         }
 
         for (ip = 0; ip < 4 ; ip++) {
-            int pin = i * 4 + ip;
+            int pin = core * LOONGSON3_CORE_PER_NODE + ip;
             sysbus_connect_irq(SYS_BUS_DEVICE(liointc),
                                pin, cpu->env.irq[ip + 2]);
         }
-- 
2.39.2 (Apple Git-143)