[Qemu-devel] [RFC 39/47] pc: pcihp: expose MMIO base and len as properties

[Igor Mammedov <imammedo@redhat.com>]

it will be used later to dynamically reserve MMIO region
instead of manually punching holes in PCI0._CRS

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/acpi/pcihp.c         | 18 ++++++++++++------
 hw/acpi/piix4.c         |  2 +-
 include/hw/acpi/pcihp.h |  7 ++++++-
 3 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index 34dedf1..612fec0 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -297,10 +297,11 @@ static const MemoryRegionOps acpi_pcihp_io_ops = {
     },
 };
 
-void acpi_pcihp_init(AcpiPciHpState *s, PCIBus *root_bus,
+void acpi_pcihp_init(Object *owner, AcpiPciHpState *s, PCIBus *root_bus,
                      MemoryRegion *address_space_io, bool bridges_enabled)
 {
-    uint16_t io_size = ACPI_PCIHP_SIZE;
+    s->io_len = ACPI_PCIHP_SIZE;
+    s->io_base = ACPI_PCIHP_ADDR;
 
     s->root= root_bus;
     s->legacy_piix = !bridges_enabled;
@@ -308,16 +309,21 @@ void acpi_pcihp_init(AcpiPciHpState *s, PCIBus *root_bus,
     if (s->legacy_piix) {
         unsigned *bus_bsel = g_malloc(sizeof *bus_bsel);
 
-        io_size = ACPI_PCIHP_LEGACY_SIZE;
+        s->io_len = ACPI_PCIHP_LEGACY_SIZE;
 
         *bus_bsel = ACPI_PCIHP_BSEL_DEFAULT;
         object_property_add_uint32_ptr(OBJECT(root_bus), ACPI_PCIHP_PROP_BSEL,
                                        bus_bsel, NULL);
     }
 
-    memory_region_init_io(&s->io, NULL, &acpi_pcihp_io_ops, s,
-                          "acpi-pci-hotplug", io_size);
-    memory_region_add_subregion(address_space_io, ACPI_PCIHP_ADDR, &s->io);
+    memory_region_init_io(&s->io, owner, &acpi_pcihp_io_ops, s,
+                          "acpi-pci-hotplug", s->io_len);
+    memory_region_add_subregion(address_space_io, s->io_base, &s->io);
+
+    object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_BASE_PROP, &s->io_base,
+                                   &error_abort);
+    object_property_add_uint16_ptr(owner, ACPI_PCIHP_IO_LEN_PROP, &s->io_len,
+                                   &error_abort);
 }
 
 const VMStateDescription vmstate_acpi_pcihp_pci_status = {
diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index 481a16c..757f7d8 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -556,7 +556,7 @@ static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
                           "acpi-gpe0", GPE_LEN);
     memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe);
 
-    acpi_pcihp_init(&s->acpi_pci_hotplug, bus, parent,
+    acpi_pcihp_init(OBJECT(s), &s->acpi_pci_hotplug, bus, parent,
                     s->use_acpi_pci_hotplug);
 
     acpi_cpu_hotplug_init(parent, OBJECT(s), &s->gpe_cpu,
diff --git a/include/hw/acpi/pcihp.h b/include/hw/acpi/pcihp.h
index 9323838..f3526d4 100644
--- a/include/hw/acpi/pcihp.h
+++ b/include/hw/acpi/pcihp.h
@@ -32,6 +32,9 @@
 #include "hw/acpi/acpi.h"
 #include "migration/vmstate.h"
 
+#define ACPI_PCIHP_IO_BASE_PROP "acpi-pcihp-io-base"
+#define ACPI_PCIHP_IO_LEN_PROP "acpi-pcihp-io-len"
+
 typedef struct AcpiPciHpPciStatus {
     uint32_t up;
     uint32_t down;
@@ -48,9 +51,11 @@ typedef struct AcpiPciHpState {
     PCIBus *root;
     MemoryRegion io;
     bool legacy_piix;
+    uint16_t io_base;
+    uint16_t io_len;
 } AcpiPciHpState;
 
-void acpi_pcihp_init(AcpiPciHpState *, PCIBus *root,
+void acpi_pcihp_init(Object *owner, AcpiPciHpState *, PCIBus *root,
                      MemoryRegion *address_space_io, bool bridges_enabled);
 
 void acpi_pcihp_device_plug_cb(ACPIREGS *ar, qemu_irq irq, AcpiPciHpState *s,
-- 
1.8.3.1