| Message ID | 1452867091-4023-1-git-send-email-shannon.zhao@linaro.org |
|---|---|
| State | New |
| Headers | show |
On Fri, Jan 15, 2016 at 10:11:31PM +0800, Shannon Zhao wrote: > When booting the VM with UEFI, UEFI takes ownership of the RTC hardware. > While UEFI can use libfdt to disable the RTC device node in the DTB that > it passes to the OS, it cannot modify AML. Therefore, we won't generate > the RTC ACPI device at all when using UEFI. > > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> > Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > Reviewed-by: Laszlo Ersek <lersek@redhat.com> > --- > V3: add comments to explain why it doesn't generate RTC ACPI device > --- > hw/arm/virt-acpi-build.c | 24 +++++------------------- > 1 file changed, 5 insertions(+), 19 deletions(-) > > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c > index 0caf5ce..0d5c635 100644 > --- a/hw/arm/virt-acpi-build.c > +++ b/hw/arm/virt-acpi-build.c > @@ -94,23 +94,6 @@ static void acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap, > aml_append(scope, dev); > } > > -static void acpi_dsdt_add_rtc(Aml *scope, const MemMapEntry *rtc_memmap, > - uint32_t rtc_irq) > -{ > - Aml *dev = aml_device("RTC0"); > - aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0013"))); > - aml_append(dev, aml_name_decl("_UID", aml_int(0))); > - > - Aml *crs = aml_resource_template(); > - aml_append(crs, aml_memory32_fixed(rtc_memmap->base, > - rtc_memmap->size, AML_READ_WRITE)); > - aml_append(crs, > - aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH, > - AML_EXCLUSIVE, &rtc_irq, 1)); > - aml_append(dev, aml_name_decl("_CRS", crs)); > - aml_append(scope, dev); > -} > - > static void acpi_dsdt_add_flash(Aml *scope, const MemMapEntry *flash_memmap) > { > Aml *dev, *crs; > @@ -571,12 +554,15 @@ build_dsdt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info) > /* Reserve space for header */ > acpi_data_push(dsdt->buf, sizeof(AcpiTableHeader)); > > + /* When booting the VM with UEFI, UEFI takes ownership of the RTC hardware. > + * While UEFI can use libfdt to disable the RTC device node in the DTB that > + * it passes to the OS, it cannot modify AML. Therefore, we won't generate > + * the RTC ACPI device at all when using UEFI. > + */ > scope = aml_scope("\\_SB"); > acpi_dsdt_add_cpus(scope, guest_info->smp_cpus); > acpi_dsdt_add_uart(scope, &memmap[VIRT_UART], > (irqmap[VIRT_UART] + ARM_SPI_BASE)); > - acpi_dsdt_add_rtc(scope, &memmap[VIRT_RTC], > - (irqmap[VIRT_RTC] + ARM_SPI_BASE)); > acpi_dsdt_add_flash(scope, &memmap[VIRT_FLASH]); > acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO], > (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS); > -- > 2.1.0 > > Reviewed-by: Andrew Jones <drjones@redhat.com>
On 15 January 2016 at 14:11, Shannon Zhao <shannon.zhao@linaro.org> wrote: > When booting the VM with UEFI, UEFI takes ownership of the RTC hardware. > While UEFI can use libfdt to disable the RTC device node in the DTB that > it passes to the OS, it cannot modify AML. Therefore, we won't generate > the RTC ACPI device at all when using UEFI. > > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> > Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > Reviewed-by: Laszlo Ersek <lersek@redhat.com> > --- > V3: add comments to explain why it doesn't generate RTC ACPI device Applied to target-arm.next, thanks. -- PMM
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index 0caf5ce..0d5c635 100644 --- a/hw/arm/virt-acpi-build.c +++ b/hw/arm/virt-acpi-build.c @@ -94,23 +94,6 @@ static void acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap, aml_append(scope, dev); } -static void acpi_dsdt_add_rtc(Aml *scope, const MemMapEntry *rtc_memmap, - uint32_t rtc_irq) -{ - Aml *dev = aml_device("RTC0"); - aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0013"))); - aml_append(dev, aml_name_decl("_UID", aml_int(0))); - - Aml *crs = aml_resource_template(); - aml_append(crs, aml_memory32_fixed(rtc_memmap->base, - rtc_memmap->size, AML_READ_WRITE)); - aml_append(crs, - aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH, - AML_EXCLUSIVE, &rtc_irq, 1)); - aml_append(dev, aml_name_decl("_CRS", crs)); - aml_append(scope, dev); -} - static void acpi_dsdt_add_flash(Aml *scope, const MemMapEntry *flash_memmap) { Aml *dev, *crs; @@ -571,12 +554,15 @@ build_dsdt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info) /* Reserve space for header */ acpi_data_push(dsdt->buf, sizeof(AcpiTableHeader)); + /* When booting the VM with UEFI, UEFI takes ownership of the RTC hardware. + * While UEFI can use libfdt to disable the RTC device node in the DTB that + * it passes to the OS, it cannot modify AML. Therefore, we won't generate + * the RTC ACPI device at all when using UEFI. + */ scope = aml_scope("\\_SB"); acpi_dsdt_add_cpus(scope, guest_info->smp_cpus); acpi_dsdt_add_uart(scope, &memmap[VIRT_UART], (irqmap[VIRT_UART] + ARM_SPI_BASE)); - acpi_dsdt_add_rtc(scope, &memmap[VIRT_RTC], - (irqmap[VIRT_RTC] + ARM_SPI_BASE)); acpi_dsdt_add_flash(scope, &memmap[VIRT_FLASH]); acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO], (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS);