[RFC PATCH 07/10] hw/pci/pci: Introduce pci_register_portio_list()

[Bernhard Beschow <shentey@gmail.com>]

pci_ide_init_ioport() and pci_register_portio_list() are introduced which
mirror their ISA counterparts. But rather than asking for an ISADevice, the
functions ask for PCIDevice which can be used in hw/ide/piix which fixes
having to pass a NULL ISADevice which is not avialable there.

Passing NULL as ISADevice to pci_ide_init_ioport() also causes a NULL
ISADevice to be passed to isa_register_ioport(). Currently this function
always uses the isabus global. To fix this, we'll want to determine the
ISABus using isa_bus_from_device(), so no call-site must pass a NULL
ISADevice.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 hw/ide/ioport.c           | 14 ++++++++++++++
 hw/pci/pci.c              | 18 ++++++++++++++++++
 include/hw/ide/internal.h |  1 +
 include/hw/pci/pci.h      | 21 +++++++++++++++++++++
 4 files changed, 54 insertions(+)

diff --git a/hw/ide/ioport.c b/hw/ide/ioport.c
index ed1f34f573..69e4fa15d4 100644
--- a/hw/ide/ioport.c
+++ b/hw/ide/ioport.c
@@ -25,6 +25,7 @@
 
 #include "qemu/osdep.h"
 #include "hw/isa/isa.h"
+#include "hw/pci/pci_bus.h"
 #include "qemu/error-report.h"
 #include "qemu/timer.h"
 #include "sysemu/blockdev.h"
@@ -62,3 +63,16 @@ void isa_ide_init_ioport(IDEBus *bus, ISADevice *dev, int iobase, int iobase2)
                                  iobase2, ide_portio2_list, bus, "ide");
     }
 }
+
+void pci_ide_init_ioport(IDEBus *bus, PCIDevice *dev, int iobase, int iobase2)
+{
+    assert(dev);
+
+    pci_register_portio_list(dev, &bus->portio_list,
+                             iobase, ide_portio_list, bus, "ide");
+
+    if (iobase2) {
+        pci_register_portio_list(dev, &bus->portio2_list,
+                                 iobase2, ide_portio2_list, bus, "ide");
+    }
+}
diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 2f450f6a72..3046dd5477 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1440,6 +1440,24 @@ pcibus_t pci_bar_address(PCIDevice *d,
     return new_addr;
 }
 
+void pci_register_portio_list(PCIDevice *dev,
+                              PortioList *piolist, uint16_t start,
+                              const MemoryRegionPortio *pio_start,
+                              void *opaque, const char *name)
+{
+    PCIBus *bus;
+
+    assert(dev);
+    assert(piolist && !piolist->owner);
+
+    bus = pci_get_bus(dev);
+
+    assert(bus);
+
+    portio_list_init(piolist, OBJECT(dev), pio_start, opaque, name);
+    portio_list_add(piolist, bus->address_space_io, start);
+}
+
 static void pci_update_mappings(PCIDevice *d)
 {
     PCIIORegion *r;
diff --git a/include/hw/ide/internal.h b/include/hw/ide/internal.h
index 86ecc04ce4..4a375d3c09 100644
--- a/include/hw/ide/internal.h
+++ b/include/hw/ide/internal.h
@@ -625,6 +625,7 @@ int ide_init_drive(IDEState *s, BlockBackend *blk, IDEDriveKind kind,
 void ide_init2(IDEBus *bus, qemu_irq irq);
 void ide_exit(IDEState *s);
 void isa_ide_init_ioport(IDEBus *bus, ISADevice *isa, int iobase, int iobase2);
+void pci_ide_init_ioport(IDEBus *bus, PCIDevice *isa, int iobase, int iobase2);
 void ide_register_restart_cb(IDEBus *bus);
 
 void ide_exec_cmd(IDEBus *bus, uint32_t val);
diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index b54b6ef88f..91b479d542 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -522,6 +522,27 @@ void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque);
 pcibus_t pci_bar_address(PCIDevice *d,
                          int reg, uint8_t type, pcibus_t size);
 
+/**
+ * pci_register_portio_list: Initialize a set of io ports
+ *
+ * Several ISA devices have many dis-joint I/O ports.  Worse, these I/O
+ * ports can be interleaved with I/O ports from other devices.  This
+ * function makes it easy to create multiple MemoryRegions for a single
+ * device and use the legacy portio routines.
+ *
+ * @dev: the PCIDevice against which these are registered
+ * @piolist: the PortioList associated with the io ports
+ * @start: the base I/O port against which the portio->offset is applied.
+ * @portio: the ports, sorted by offset.
+ * @opaque: passed into the portio callbacks.
+ * @name: passed into memory_region_init_io.
+ */
+void pci_register_portio_list(PCIDevice *dev,
+                              PortioList *piolist,
+                              uint16_t start,
+                              const MemoryRegionPortio *portio,
+                              void *opaque, const char *name);
+
 static inline void
 pci_set_byte(uint8_t *config, uint8_t val)
 {
-- 
2.36.1