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Re: [PATCH 2/3] hw/acpi/cpu_hotplug: Rename 'parent' MemoryRegion as 'co
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH 2/3] hw/acpi/cpu_hotplug: Rename 'parent' MemoryRegion as 'container' |
Date: |
Tue, 28 Feb 2023 17:21:34 -0500 |
On Tue, Feb 28, 2023 at 11:16:46PM +0100, Philippe Mathieu-Daudé wrote:
> On 28/2/23 22:43, Michael S. Tsirkin wrote:
> > On Fri, Feb 03, 2023 at 05:30:20PM +0100, Philippe Mathieu-Daudé wrote:
> > > No logical change, rename for clarity.
> > >
> > > Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> >
> > Can't say container is clearer. If we are changing things
> > I'd like to see a real improvement.
>
> QOM API usually use 'parent' to indicate the inheritance / hierarchy
> between object.
> Memory API uses 'container', in particular when used with
> memory_region_add_subregion().
It says "container" in the comment but not in the API:
/**
* memory_region_add_subregion: Add a subregion to a container.
*
* Adds a subregion at @offset. The subregion may not overlap with other
* subregions (except for those explicitly marked as overlapping). A region
* may only be added once as a subregion (unless removed with
* memory_region_del_subregion()); use memory_region_init_alias() if you
* want a region to be a subregion in multiple locations.
*
* @mr: the region to contain the new subregion; must be a container
* initialized with memory_region_init().
* @offset: the offset relative to @mr where @subregion is added.
* @subregion: the subregion to be added.
*/
void memory_region_add_subregion(MemoryRegion *mr,
hwaddr offset,
MemoryRegion *subregion);
> I still believe this is a worthwhile change as API style cleanup,
> but I agree the commit description lacks this explanation.
If you are cleaning up APIs it's a good idea to add documentation.
As long as you don't these renames don't add much.
> > > ---
> > > hw/acpi/acpi-cpu-hotplug-stub.c | 2 +-
> > > hw/acpi/cpu_hotplug.c | 10 +++++-----
> > > hw/acpi/piix4.c | 10 +++++-----
> > > include/hw/acpi/cpu_hotplug.h | 2 +-
> > > 4 files changed, 12 insertions(+), 12 deletions(-)
> > >
> > > diff --git a/hw/acpi/acpi-cpu-hotplug-stub.c
> > > b/hw/acpi/acpi-cpu-hotplug-stub.c
> > > index b590ad57e1..cbd7a6ec00 100644
> > > --- a/hw/acpi/acpi-cpu-hotplug-stub.c
> > > +++ b/hw/acpi/acpi-cpu-hotplug-stub.c
> > > @@ -13,7 +13,7 @@ void acpi_switch_to_modern_cphp(AcpiCpuHotplug *gpe,
> > > return;
> > > }
> > > -void legacy_acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
> > > +void legacy_acpi_cpu_hotplug_init(MemoryRegion *container, Object *owner,
> > > AcpiCpuHotplug *gpe, uint16_t base)
> > > {
> > > return;
> > > diff --git a/hw/acpi/cpu_hotplug.c b/hw/acpi/cpu_hotplug.c
> > > index 3cfa4f45dc..636e985c50 100644
> > > --- a/hw/acpi/cpu_hotplug.c
> > > +++ b/hw/acpi/cpu_hotplug.c
> > > @@ -81,14 +81,14 @@ void legacy_acpi_cpu_plug_cb(HotplugHandler
> > > *hotplug_dev, AcpiCpuHotplug *gpe,
> > > acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
> > > }
> > > -void legacy_acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
> > > +void legacy_acpi_cpu_hotplug_init(MemoryRegion *container, Object *owner,
> > > AcpiCpuHotplug *gpe, uint16_t base)
> > > {
> > > CPUState *cpu;
> > > memory_region_init_io(&gpe->io, owner, &AcpiCpuHotplug_ops,
> > > gpe, "acpi-cpu-hotplug", ACPI_GPE_PROC_LEN);
> > > - memory_region_add_subregion(parent, base, &gpe->io);
> > > + memory_region_add_subregion(container, base, &gpe->io);
> > > gpe->device = owner;
> > > CPU_FOREACH(cpu) {
> > > @@ -100,10 +100,10 @@ void acpi_switch_to_modern_cphp(AcpiCpuHotplug *gpe,
> > > CPUHotplugState *cpuhp_state,
> > > uint16_t io_port)
> > > {
> > > - MemoryRegion *parent = pci_address_space_io(PCI_DEVICE(gpe->device));
> > > + MemoryRegion *container =
> > > pci_address_space_io(PCI_DEVICE(gpe->device));
> > > - memory_region_del_subregion(parent, &gpe->io);
> > > - cpu_hotplug_hw_init(parent, gpe->device, cpuhp_state, io_port);
> > > + memory_region_del_subregion(container, &gpe->io);
> > > + cpu_hotplug_hw_init(container, gpe->device, cpuhp_state, io_port);
> > > }
> > > void build_legacy_cpu_hotplug_aml(Aml *ctx, MachineState *machine,
> > > diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
> > > index c702d83f27..5595fe5be5 100644
> > > --- a/hw/acpi/piix4.c
> > > +++ b/hw/acpi/piix4.c
> > > @@ -555,15 +555,15 @@ static void piix4_set_cpu_hotplug_legacy(Object
> > > *obj, bool value, Error **errp)
> > > s->cpu_hotplug_legacy = value;
> > > }
> > > -static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
> > > +static void piix4_acpi_system_hot_add_init(MemoryRegion *container,
> > > PCIBus *bus, PIIX4PMState *s)
> > > {
> > > memory_region_init_io(&s->io_gpe, OBJECT(s), &piix4_gpe_ops, s,
> > > "acpi-gpe0", GPE_LEN);
> > > - memory_region_add_subregion(parent, GPE_BASE, &s->io_gpe);
> > > + memory_region_add_subregion(container, GPE_BASE, &s->io_gpe);
> > > if (s->use_acpi_hotplug_bridge || s->use_acpi_root_pci_hotplug) {
> > > - acpi_pcihp_init(OBJECT(s), &s->acpi_pci_hotplug, bus, parent,
> > > + acpi_pcihp_init(OBJECT(s), &s->acpi_pci_hotplug, bus, container,
> > > s->use_acpi_hotplug_bridge,
> > > ACPI_PCIHP_ADDR_PIIX4);
> > > }
> > > @@ -571,11 +571,11 @@ static void
> > > piix4_acpi_system_hot_add_init(MemoryRegion *parent,
> > > object_property_add_bool(OBJECT(s), "cpu-hotplug-legacy",
> > > piix4_get_cpu_hotplug_legacy,
> > > piix4_set_cpu_hotplug_legacy);
> > > - legacy_acpi_cpu_hotplug_init(parent, OBJECT(s), &s->gpe,
> > > + legacy_acpi_cpu_hotplug_init(container, OBJECT(s), &s->gpe,
> > > PIIX4_CPU_HOTPLUG_IO_BASE);
> > > if (s->acpi_memory_hotplug.is_enabled) {
> > > - acpi_memory_hotplug_init(parent, OBJECT(s),
> > > &s->acpi_memory_hotplug,
> > > + acpi_memory_hotplug_init(container, OBJECT(s),
> > > &s->acpi_memory_hotplug,
> > > ACPI_MEMORY_HOTPLUG_BASE);
> > > }
> > > }
> > > diff --git a/include/hw/acpi/cpu_hotplug.h b/include/hw/acpi/cpu_hotplug.h
> > > index 99c11b7151..5ff24ec417 100644
> > > --- a/include/hw/acpi/cpu_hotplug.h
> > > +++ b/include/hw/acpi/cpu_hotplug.h
> > > @@ -28,7 +28,7 @@ typedef struct AcpiCpuHotplug {
> > > void legacy_acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
> > > AcpiCpuHotplug *gpe,
> > > DeviceState *dev, Error **errp);
> > > -void legacy_acpi_cpu_hotplug_init(MemoryRegion *parent, Object *owner,
> > > +void legacy_acpi_cpu_hotplug_init(MemoryRegion *container, Object *owner,
> > > AcpiCpuHotplug *gpe, uint16_t base);
> > > void acpi_switch_to_modern_cphp(AcpiCpuHotplug *gpe,
> > > --
> > > 2.38.1
> >
Re: [PATCH 0/3] hw/acpi/cpu_hotplug: Convert 'Object *device' -> 'DeviceState *parent', Philippe Mathieu-Daudé, 2023/02/22