[Qemu-devel] [PATCH v3 10/10] hw/arm/virt: Init GED device and enable memory hotplug

[Shameer Kolothum]

This initializes the GED device with base memory and irq,
configures ged memory hotplug event and builds the
corresponding aml code.

GED irq routing to Guest is also enabled. Memory hotplug
should now work.

Signed-off-by: Shameer Kolothum <address@hidden>
---
 hw/acpi/generic_event_device.c | 18 ++++++++++++++++++
 hw/arm/virt-acpi-build.c       |  9 +++++++++
 hw/arm/virt.c                  | 30 +++++++++++++++++++++++++-----
 include/hw/arm/virt.h          |  2 ++
 4 files changed, 54 insertions(+), 5 deletions(-)

diff --git a/hw/acpi/generic_event_device.c b/hw/acpi/generic_event_device.c
index 9deaa33..02d5e66 100644
--- a/hw/acpi/generic_event_device.c
+++ b/hw/acpi/generic_event_device.c
@@ -200,6 +200,23 @@ static void acpi_ged_event(GEDState *ged_st, uint32_t 
ged_irq_sel)
     qemu_irq_pulse(ged_st->gsi[ged_st->irq]);
 }
 
+static void acpi_ged_init(MemoryRegion *as, DeviceState *dev, GEDState *ged_st)
+{
+    VirtAcpiState *s = VIRT_ACPI(dev);
+
+    assert(!ged_io_base && !ged_events && !ged_events_size);
+
+    ged_io_base = s->ged_base;
+    ged_events = s->ged_events;
+    ged_events_size = s->ged_events_size;
+    ged_st->irq = s->ged_irq;
+    ged_st->gsi = s->gsi;
+    qemu_mutex_init(&ged_st->lock);
+    memory_region_init_io(&ged_st->io, OBJECT(dev), &ged_ops, ged_st,
+                          "acpi-ged-event", ACPI_GED_REG_LEN);
+    memory_region_add_subregion(as, ged_io_base, &ged_st->io);
+}
+
 static void virt_device_plug_cb(HotplugHandler *hotplug_dev,
                                 DeviceState *dev, Error **errp)
 {
@@ -242,6 +259,7 @@ static void virt_device_realize(DeviceState *dev, Error 
**errp)
         acpi_memory_hotplug_init(get_system_memory(), OBJECT(dev),
                                  &s->memhp_state,
                                  s->memhp_base);
+        acpi_ged_init(get_system_memory(), dev, &s->ged_state);
     }
 }
 
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 1887531..116e9c9 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -41,6 +41,7 @@
 #include "hw/hw.h"
 #include "hw/acpi/aml-build.h"
 #include "hw/acpi/memory_hotplug.h"
+#include "hw/acpi/generic_event_device.h"
 #include "hw/pci/pcie_host.h"
 #include "hw/pci/pci.h"
 #include "hw/arm/virt.h"
@@ -50,6 +51,13 @@
 #define ARM_SPI_BASE 32
 #define ACPI_POWER_BUTTON_DEVICE "PWRB"
 
+static void acpi_dsdt_add_ged(Aml *scope, VirtMachineState *vms)
+{
+    int irq =  vms->irqmap[VIRT_ACPI_GED] + ARM_SPI_BASE;
+
+    build_ged_aml(scope, "\\_SB."GED_DEVICE, irq, AML_SYSTEM_MEMORY);
+}
+
 static void acpi_dsdt_add_memory_hotplug(Aml *scope, MachineState *ms)
 {
     uint32_t nr_mem = ms->ram_slots;
@@ -758,6 +766,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, 
VirtMachineState *vms)
      */
     scope = aml_scope("\\_SB");
     acpi_dsdt_add_memory_hotplug(scope, MACHINE(vms));
+    acpi_dsdt_add_ged(scope, vms);
     acpi_dsdt_add_cpus(scope, vms->smp_cpus);
     acpi_dsdt_add_uart(scope, &memmap[VIRT_UART],
                        (irqmap[VIRT_UART] + ARM_SPI_BASE));
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index b602151..e3f8aa7 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -63,6 +63,7 @@
 #include "target/arm/internals.h"
 #include "hw/mem/pc-dimm.h"
 #include "hw/mem/nvdimm.h"
+#include "hw/acpi/generic_event_device.h"
 
 #define DEFINE_VIRT_MACHINE_LATEST(major, minor, latest) \
     static void virt_##major##_##minor##_class_init(ObjectClass *oc, \
@@ -134,6 +135,7 @@ static const MemMapEntry base_memmap[] = {
     [VIRT_SECURE_UART] =        { 0x09040000, 0x00001000 },
     [VIRT_SMMU] =               { 0x09050000, 0x00020000 },
     [VIRT_PCDIMM_ACPI] =        { 0x09070000, 0x00010000 },
+    [VIRT_ACPI_GED] =           { 0x09080000, 0x00010000 },
     [VIRT_MMIO] =               { 0x0a000000, 0x00000200 },
     /* ...repeating for a total of NUM_VIRTIO_TRANSPORTS, each of that size */
     [VIRT_PLATFORM_BUS] =       { 0x0c000000, 0x02000000 },
@@ -169,6 +171,7 @@ static const int a15irqmap[] = {
     [VIRT_PCIE] = 3, /* ... to 6 */
     [VIRT_GPIO] = 7,
     [VIRT_SECURE_UART] = 8,
+    [VIRT_ACPI_GED] = 9,
     [VIRT_MMIO] = 16, /* ...to 16 + NUM_VIRTIO_TRANSPORTS - 1 */
     [VIRT_GIC_V2M] = 48, /* ...to 48 + NUM_GICV2M_SPIS - 1 */
     [VIRT_SMMU] = 74,    /* ...to 74 + NUM_SMMU_IRQS - 1 */
@@ -184,6 +187,13 @@ static const char *valid_cpus[] = {
     ARM_CPU_TYPE_NAME("max"),
 };
 
+static GedEvent ged_events[] = {
+    {
+        .selector = ACPI_GED_IRQ_SEL_MEM,
+        .event    = GED_MEMORY_HOTPLUG,
+    },
+};
+
 static bool cpu_type_valid(const char *cpu)
 {
     int i;
@@ -524,6 +534,11 @@ static DeviceState *create_virt_acpi(VirtMachineState *vms)
     dev = qdev_create(NULL, "virt-acpi");
     qdev_prop_set_uint64(dev, "memhp_base",
                          vms->memmap[VIRT_PCDIMM_ACPI].base);
+    qdev_prop_set_ptr(dev, "gsi", vms->gsi);
+    qdev_prop_set_uint64(dev, "ged_base", vms->memmap[VIRT_ACPI_GED].base);
+    qdev_prop_set_uint32(dev, "ged_irq", vms->irqmap[VIRT_ACPI_GED]);
+    qdev_prop_set_ptr(dev, "ged_events", ged_events);
+    qdev_prop_set_uint32(dev, "ged_events_size", ARRAY_SIZE(ged_events));
     qdev_init_nofail(dev);
 
     return dev;
@@ -568,6 +583,12 @@ static void create_v2m(VirtMachineState *vms, qemu_irq 
*pic)
     fdt_add_v2m_gic_node(vms);
 }
 
+static void virt_gsi_handler(void *opaque, int n, int level)
+{
+    qemu_irq *gic_irq = opaque;
+    qemu_set_irq(gic_irq[n], level);
+}
+
 static void create_gic(VirtMachineState *vms, qemu_irq *pic)
 {
     /* We create a standalone GIC */
@@ -683,6 +704,8 @@ static void create_gic(VirtMachineState *vms, qemu_irq *pic)
         pic[i] = qdev_get_gpio_in(gicdev, i);
     }
 
+    vms->gsi = qemu_allocate_irqs(virt_gsi_handler, pic, NUM_IRQS);
+
     fdt_add_gic_node(vms);
 
     if (type == 3 && vms->its) {
@@ -1431,7 +1454,7 @@ static void machvirt_init(MachineState *machine)
     VirtMachineClass *vmc = VIRT_MACHINE_GET_CLASS(machine);
     MachineClass *mc = MACHINE_GET_CLASS(machine);
     const CPUArchIdList *possible_cpus;
-    qemu_irq pic[NUM_IRQS];
+    qemu_irq *pic;
     MemoryRegion *sysmem = get_system_memory();
     MemoryRegion *secure_sysmem = NULL;
     int n, virt_max_cpus;
@@ -1627,6 +1650,7 @@ static void machvirt_init(MachineState *machine)
 
     create_flash(vms, sysmem, secure_sysmem ? secure_sysmem : sysmem);
 
+    pic = g_new0(qemu_irq, NUM_IRQS);
     create_gic(vms, pic);
 
     fdt_add_pmu_nodes(vms);
@@ -1842,10 +1866,6 @@ static void virt_memory_pre_plug(HotplugHandler 
*hotplug_dev, DeviceState *dev,
 {
     const bool is_nvdimm = object_dynamic_cast(OBJECT(dev), TYPE_NVDIMM);
 
-    if (dev->hotplugged) {
-        error_setg(errp, "memory hotplug is not supported");
-    }
-
     if (is_nvdimm) {
         error_setg(errp, "nvdimm is not yet supported");
         return;
diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
index 14b2e0a..850296a 100644
--- a/include/hw/arm/virt.h
+++ b/include/hw/arm/virt.h
@@ -78,6 +78,7 @@ enum {
     VIRT_SECURE_UART,
     VIRT_SECURE_MEM,
     VIRT_PCDIMM_ACPI,
+    VIRT_ACPI_GED,
     VIRT_LOWMEMMAP_LAST,
 };
 
@@ -135,6 +136,7 @@ typedef struct {
     int psci_conduit;
     hwaddr highest_gpa;
     DeviceState *acpi;
+    qemu_irq *gsi;
 } VirtMachineState;
 
 #define VIRT_ECAM_ID(high) (high ? VIRT_HIGH_PCIE_ECAM : VIRT_PCIE_ECAM)
-- 
2.7.4