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Re: [PATCH v2 08/10] hw/ide: Let ide_init_ioport() take a MemoryRegion a


From: Mark Cave-Ayland
Subject: Re: [PATCH v2 08/10] hw/ide: Let ide_init_ioport() take a MemoryRegion argument instead of ISADevice
Date: Sun, 5 Feb 2023 22:02:02 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0

On 26/01/2023 21:17, Bernhard Beschow wrote:

Both callers to ide_init_ioport() have access to the I/O memory region
of the ISA bus, so can pass it directly. This allows ide_init_ioport()
to directly call portio_list_init().

Note, now the callers become the owner of the PortioList.

Inspired-by: <20210518215545.1793947-10-philmd@redhat.com>
   'hw/ide: Let ide_init_ioport() take an ISA bus argument instead of device'
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
  include/hw/ide/internal.h |  3 ++-
  hw/ide/ioport.c           | 15 ++++++++-------
  hw/ide/isa.c              |  4 +++-
  hw/ide/piix.c             |  8 ++++++--
  4 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/include/hw/ide/internal.h b/include/hw/ide/internal.h
index 42c49414f4..c3e4d192fa 100644
--- a/include/hw/ide/internal.h
+++ b/include/hw/ide/internal.h
@@ -628,7 +628,8 @@ int ide_init_drive(IDEState *s, BlockBackend *blk, 
IDEDriveKind kind,
                     int chs_trans, Error **errp);
  void ide_init2(IDEBus *bus, qemu_irq irq);
  void ide_exit(IDEState *s);
-void ide_init_ioport(IDEBus *bus, ISADevice *isa, int iobase, int iobase2);
+void ide_init_ioport(IDEBus *bus, MemoryRegion *address_space_io, Object 
*owner,
+                     int iobase, int iobase2);
  void ide_register_restart_cb(IDEBus *bus);
void ide_exec_cmd(IDEBus *bus, uint32_t val);
diff --git a/hw/ide/ioport.c b/hw/ide/ioport.c
index b613ff3bba..00e9baf0d1 100644
--- a/hw/ide/ioport.c
+++ b/hw/ide/ioport.c
@@ -50,15 +50,16 @@ static const MemoryRegionPortio ide_portio2_list[] = {
      PORTIO_END_OF_LIST(),
  };
-void ide_init_ioport(IDEBus *bus, ISADevice *dev, int iobase, int iobase2)
+void ide_init_ioport(IDEBus *bus, MemoryRegion *address_space_io, Object 
*owner,
+                     int iobase, int iobase2)
  {
-    /* ??? Assume only ISA and PCI configurations, and that the PCI-ISA
-       bridge has been setup properly to always register with ISA.  */
-    isa_register_portio_list(dev, &bus->portio_list,
-                             iobase, ide_portio_list, bus, "ide");
+    assert(address_space_io);
+
+    portio_list_init(&bus->portio_list, owner, ide_portio_list, bus, "ide",
+                     address_space_io, iobase);
if (iobase2) {
-        isa_register_portio_list(dev, &bus->portio2_list,
-                                 iobase2, ide_portio2_list, bus, "ide");
+        portio_list_init(&bus->portio2_list, owner, ide_portio2_list, bus,
+                         "ide", address_space_io, iobase2);
      }
  }
diff --git a/hw/ide/isa.c b/hw/ide/isa.c
index 8bedbd13f1..cab5d0a07a 100644
--- a/hw/ide/isa.c
+++ b/hw/ide/isa.c
@@ -72,9 +72,11 @@ static void isa_ide_realizefn(DeviceState *dev, Error **errp)
  {
      ISADevice *isadev = ISA_DEVICE(dev);
      ISAIDEState *s = ISA_IDE(dev);
+    ISABus *isabus = isa_bus_from_device(isadev);
ide_bus_init(&s->bus, sizeof(s->bus), dev, 0, 2);
-    ide_init_ioport(&s->bus, isadev, s->iobase, s->iobase2);
+    ide_init_ioport(&s->bus, isabus->address_space_io, OBJECT(dev),
+                    s->iobase, s->iobase2);
      s->irq = isa_get_irq(isadev, s->isairq);
      ide_init2(&s->bus, s->irq);
      vmstate_register(VMSTATE_IF(dev), 0, &vmstate_ide_isa, s);
diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index f0d95761ac..236b5b7416 100644
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -29,6 +29,7 @@
#include "qemu/osdep.h"
  #include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
  #include "migration/vmstate.h"
  #include "qapi/error.h"
  #include "qemu/module.h"
@@ -143,8 +144,11 @@ static void pci_piix_init_ports(PCIIDEState *d, ISABus 
*isa_bus)
          {0x1f0, 0x3f6, 14},
          {0x170, 0x376, 15},
      };
+    PCIBus *pci_bus = pci_get_bus(&d->parent_obj);
      int i;
+ assert(pci_bus);
+
      if (isa_bus) {
          d->isa_irqs[0] = isa_bus->irqs[port_info[0].isairq];
          d->isa_irqs[1] = isa_bus->irqs[port_info[1].isairq];
@@ -154,8 +158,8 @@ static void pci_piix_init_ports(PCIIDEState *d, ISABus 
*isa_bus)
for (i = 0; i < 2; i++) {
          ide_bus_init(&d->bus[i], sizeof(d->bus[i]), DEVICE(d), i, 2);
-        ide_init_ioport(&d->bus[i], NULL, port_info[i].iobase,
-                        port_info[i].iobase2);
+        ide_init_ioport(&d->bus[i], pci_bus->address_space_io, OBJECT(d),
+                        port_info[i].iobase, port_info[i].iobase2);
          ide_init2(&d->bus[i], qdev_get_gpio_in(DEVICE(d), i));
bmdma_init(&d->bus[i], &d->bmdma[i], d);

Again, given that I suspect ioports are specific to x86 I'd be inclined to leave this as a reference to ISA. I could see there being a function that exists such as isa_get_address_space_io(ISADevice *isa) in the same way as pci_address_space_io(), for example.


ATB,

Mark.



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