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Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _H
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID |
Date: |
Mon, 6 Jan 2020 04:39:51 -0500 |
On Sun, Jan 05, 2020 at 04:54:20PM -0600, Corey Minyard wrote:
> On Sun, Jan 05, 2020 at 07:33:55AM -0500, Michael S. Tsirkin wrote:
> > On Thu, Dec 19, 2019 at 02:47:59PM +0800, Heyi Guo wrote:
> > > According to ACPI spec, _ADR should be used for device which is on a
> > > bus that has a standard enumeration algorithm. It does not make sense
> > > to have a _ADR object for devices which already have _HID and will be
> > > enumerated by OSPM.
> > >
> > > Signed-off-by: Heyi Guo <address@hidden>
> >
> > Are you sure? I would think this depends on the ID and the device
> > really. E.g. PCI devices all are expected to have _ADR and some of them
> > have a _HID.
>
> That's my understanding, too.
>
> >
> > CC Corey who added a device with both HID and ADR to x86 recenly.
> >
> > Apropos Corey, why was HID APP0005 chosen?
>
> I don't remember. I thought I had looked it up someplace, but I didn't
> document it.
>
> >From reading the spec, I believe you could safely delete the _HID and it
> would be fine. However, I don't see anything that says it can't be
> there, either. But it is extraneous.
>
> Searching on the web a bit, I see that the APP0005 has confused windows.
Could you post the link you found pls?
> It does look to be wrong. Maybe deleting it would be a good idea.
>
> -corey
>
> >
> > > ---
> > > Cc: Shannon Zhao <address@hidden>
> > > Cc: Peter Maydell <address@hidden>
> > > Cc: "Michael S. Tsirkin" <address@hidden>
> > > Cc: Igor Mammedov <address@hidden>
> > > Cc: address@hidden
> > > Cc: address@hidden
> > > ---
> > > hw/arm/virt-acpi-build.c | 8 --------
> > > tests/data/acpi/virt/DSDT | Bin 18449 -> 18426 bytes
> > > tests/data/acpi/virt/DSDT.memhp | Bin 19786 -> 19763 bytes
> > > tests/data/acpi/virt/DSDT.numamem | Bin 18449 -> 18426 bytes
> > > 4 files changed, 8 deletions(-)
> > >
> > > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> > > index 9f4c7d1889..be752c0ad8 100644
> > > --- a/hw/arm/virt-acpi-build.c
> > > +++ b/hw/arm/virt-acpi-build.c
> > > @@ -78,11 +78,6 @@ static void acpi_dsdt_add_uart(Aml *scope, const
> > > MemMapEntry *uart_memmap,
> > > AML_EXCLUSIVE, &uart_irq, 1));
> > > aml_append(dev, aml_name_decl("_CRS", crs));
> > >
> > > - /* The _ADR entry is used to link this device to the UART described
> > > - * in the SPCR table, i.e. SPCR.base_address.address == _ADR.
> > > - */
> > > - aml_append(dev, aml_name_decl("_ADR", aml_int(uart_memmap->base)));
> > > -
> > > aml_append(scope, dev);
> > > }
> > >
> > > @@ -170,7 +165,6 @@ static void acpi_dsdt_add_pci(Aml *scope, const
> > > MemMapEntry *memmap,
> > > aml_append(dev, aml_name_decl("_CID", aml_string("PNP0A03")));
> > > aml_append(dev, aml_name_decl("_SEG", aml_int(0)));
> > > aml_append(dev, aml_name_decl("_BBN", aml_int(0)));
> > > - aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> > > aml_append(dev, aml_name_decl("_UID", aml_string("PCI0")));
> > > aml_append(dev, aml_name_decl("_STR", aml_unicode("PCIe 0 Device")));
> > > aml_append(dev, aml_name_decl("_CCA", aml_int(1)));
> > > @@ -334,7 +328,6 @@ static void acpi_dsdt_add_gpio(Aml *scope, const
> > > MemMapEntry *gpio_memmap,
> > > {
> > > Aml *dev = aml_device("GPO0");
> > > aml_append(dev, aml_name_decl("_HID", aml_string("ARMH0061")));
> > > - aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> > > aml_append(dev, aml_name_decl("_UID", aml_int(0)));
> > >
> > > Aml *crs = aml_resource_template();
> > > @@ -364,7 +357,6 @@ static void acpi_dsdt_add_power_button(Aml *scope)
> > > {
> > > Aml *dev = aml_device(ACPI_POWER_BUTTON_DEVICE);
> > > aml_append(dev, aml_name_decl("_HID", aml_string("PNP0C0C")));
> > > - aml_append(dev, aml_name_decl("_ADR", aml_int(0)));
> > > aml_append(dev, aml_name_decl("_UID", aml_int(0)));
> > > aml_append(scope, dev);
> > > }
> > > diff --git a/tests/data/acpi/virt/DSDT b/tests/data/acpi/virt/DSDT
> >
> >
> > Please do not include binary changes in acpi patches.
> >
> > See comment at the top of tests/bios-tables-test.c for documentation
> > on how to update these.
> >
> > --
> > MST
> >
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Michael S. Tsirkin, 2020/01/05
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Corey Minyard, 2020/01/05
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID,
Michael S. Tsirkin <=
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Peter Maydell, 2020/01/06
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Guoheyi, 2020/01/14
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Michael S. Tsirkin, 2020/01/15
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Guoheyi, 2020/01/15
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Michael S. Tsirkin, 2020/01/15
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Michael S. Tsirkin, 2020/01/15
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Peter Maydell, 2020/01/16
- Re: [PATCH 2/2] arm/virt/acpi: remove _ADR from devices identified by _HID, Guoheyi, 2020/01/16