From: tn@semihalf•com (Tomasz Nowicki)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH V6 02/13] pci, acpi: Provide generic way to assign bus domain number.
Date: Wed, 27 Apr 2016 13:59:30 +0200 [thread overview]
Message-ID: <5720A9A2.6000609@semihalf.com> (raw)
In-Reply-To: <20160427022649.GD6789@localhost>
On 27.04.2016 04:26, Bjorn Helgaas wrote:
> On Fri, Apr 15, 2016 at 07:06:37PM +0200, Tomasz Nowicki wrote:
>> As we now have valid PCI host bridge device reference we can
>> introduce code that is going to find its bus domain number using
>> ACPI _SEG method.
>>
>> Note that _SEG method is optional, therefore _SEG absence means
>> that all PCI buses belong to domain 0.
>>
>> While at it, for the sake of code clarity we put ACPI and DT domain
>> assign methods into the corresponding helpers.
>>
>> Signed-off-by: Tomasz Nowicki <tn@semihalf•com>
>> Reviewed-by: Liviu Dudau <Liviu.Dudau@arm•com>
>> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd•com>
>> Tested-by: Jeremy Linton <jeremy.linton@arm•com>
>> Tested-by: Duc Dang <dhdang@apm•com>
>> Tested-by: Dongdong Liu <liudongdong3@huawei•com>
>> Tested-by: Hanjun Guo <hanjun.guo@linaro•org>
>> Tested-by: Graeme Gregory <graeme.gregory@linaro•org>
>> Tested-by: Sinan Kaya <okaya@codeaurora•org>
>> ---
>> drivers/acpi/pci_root.c | 18 ++++++++++++++++++
>> drivers/pci/pci.c | 11 +++++++++--
>> include/linux/pci-acpi.h | 2 ++
>> 3 files changed, 29 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
>> index 4581e0e..d9a70c4 100644
>> --- a/drivers/acpi/pci_root.c
>> +++ b/drivers/acpi/pci_root.c
>> @@ -419,6 +419,24 @@ out:
>> }
>> EXPORT_SYMBOL(acpi_pci_osc_control_set);
>>
>> +int acpi_pci_bus_domain_nr(struct device *parent)
>> +{
>> + struct acpi_device *acpi_dev = to_acpi_device(parent);
>> + unsigned long long segment = 0;
>> + acpi_status status;
>> +
>> + /*
>> + * If _SEG method does not exist, following ACPI spec (6.5.6)
>> + * all PCI buses belong to domain 0.
>> + */
>> + status = acpi_evaluate_integer(acpi_dev->handle, METHOD_NAME__SEG, NULL,
>> + &segment);
>
> We already have code in acpi_pci_root_add() to evaluate _SEG. We
> don't want to evaluate it *twice*, do we?
Ideally we do not want.
The main intention here was to avoid using "void *sysdata" to retrieve
domain number. sysdata means something different for each architectures.
This would be common way for all arch using PCI_DOMAINS_GENERIC option
such as ARM64.
>
> I was sort of expecting that if you added it here, we'd remove the
> existing call, but it looks like you're keeping both?
I leave _SEG evaluation in acpi_pci_root_add to keep support for IA64
and x86 which are still using arch-specific sysdata (struct
pci_sysdata->domain for x86 and struct pci_controller->segment for IA64)
to retrieve domain number.
ARM64 uses PCI_DOMAINS_GENERIC for DT boot method, it would be
consistent to keep it for ACPI too.
I am open to suggestions, do you think we should use sysdata for ARM64?
Thanks,
Tomasz
next prev parent reply other threads:[~2016-04-27 11:59 UTC|newest]
Thread overview: 105+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-15 17:06 [PATCH V6 00/13] Support for generic ACPI based PCI host controller Tomasz Nowicki
2016-04-15 17:06 ` [PATCH V6 01/13] pci, acpi, x86, ia64: Move ACPI host bridge device companion assignment to core code Tomasz Nowicki
2016-04-15 20:41 ` kbuild test robot
2016-04-26 22:36 ` Bjorn Helgaas
2016-04-27 10:12 ` Tomasz Nowicki
2016-04-27 2:45 ` Bjorn Helgaas
2016-05-04 8:10 ` Tomasz Nowicki
2016-05-09 22:18 ` Rafael J. Wysocki
2016-05-10 10:27 ` Lorenzo Pieralisi
2016-05-09 22:56 ` Rafael J. Wysocki
2016-05-10 1:53 ` Bjorn Helgaas
2016-05-10 10:07 ` Lorenzo Pieralisi
2016-04-15 17:06 ` [PATCH V6 02/13] pci, acpi: Provide generic way to assign bus domain number Tomasz Nowicki
2016-04-27 2:26 ` Bjorn Helgaas
2016-04-27 11:17 ` Lorenzo Pieralisi
2016-04-27 16:44 ` Bjorn Helgaas
2016-04-27 17:31 ` Lorenzo Pieralisi
2016-04-28 8:13 ` Liviu.Dudau at arm.com
2016-04-28 15:12 ` Bjorn Helgaas
2016-04-28 15:34 ` Arnd Bergmann
2016-04-29 22:50 ` Arnd Bergmann
2016-05-02 12:43 ` Tomasz Nowicki
2016-05-02 13:26 ` Jayachandran C
2016-05-03 11:02 ` Lorenzo Pieralisi
2016-05-03 14:22 ` Jayachandran C
2016-05-03 14:55 ` Lorenzo Pieralisi
2016-04-27 11:59 ` Tomasz Nowicki [this message]
2016-04-15 17:06 ` [PATCH V6 03/13] x86, ia64: Include acpi_pci_{add|remove}_bus to the default pcibios_{add|remove}_bus implementation Tomasz Nowicki
2016-04-27 2:34 ` Bjorn Helgaas
2016-04-27 13:19 ` Tomasz Nowicki
2016-04-15 17:06 ` [PATCH V6 04/13] pci, of: Move the PCI I/O space management to PCI core code Tomasz Nowicki
2016-04-15 17:06 ` [PATCH V6 05/13] acpi, pci: Support IO resources when parsing PCI host bridge resources Tomasz Nowicki
2016-04-27 2:39 ` Bjorn Helgaas
2016-04-27 5:36 ` Jon Masters
2016-04-28 21:53 ` Jon Masters
2016-04-27 14:26 ` Lorenzo Pieralisi
2016-04-27 15:10 ` Liviu.Dudau at arm.com
2016-04-27 16:09 ` Lorenzo Pieralisi
2016-04-28 15:45 ` Bjorn Helgaas
2016-04-15 17:06 ` [PATCH V6 06/13] arm64, pci, acpi: ACPI support for legacy IRQs parsing and consolidation with DT code Tomasz Nowicki
2016-04-27 2:44 ` Bjorn Helgaas
2016-04-27 11:46 ` Lorenzo Pieralisi
2016-04-15 17:06 ` [PATCH V6 07/13] PCI: Provide common functions for ECAM mapping Tomasz Nowicki
2016-04-15 18:41 ` Arnd Bergmann
2016-04-28 21:47 ` Bjorn Helgaas
2016-04-29 8:01 ` Jayachandran C
2016-05-05 9:24 ` Jayachandran C
2016-05-05 10:38 ` Tomasz Nowicki
2016-04-15 17:06 ` [PATCH V6 08/13] PCI: generic, thunder: update to use generic ECAM API Tomasz Nowicki
2016-04-15 18:39 ` Arnd Bergmann
2016-04-16 7:20 ` Jayachandran C
2016-04-16 7:31 ` Arnd Bergmann
2016-04-16 14:36 ` Jayachandran C
2016-04-18 13:03 ` Tomasz Nowicki
2016-04-18 14:44 ` Arnd Bergmann
2016-04-18 19:31 ` Tomasz Nowicki
2016-04-19 13:06 ` Arnd Bergmann
2016-04-21 9:28 ` Tomasz Nowicki
2016-04-21 9:36 ` Arnd Bergmann
2016-04-21 10:08 ` Tomasz Nowicki
2016-04-22 14:30 ` Jon Masters
2016-04-22 16:00 ` David Daney
2016-04-28 20:14 ` Bjorn Helgaas
2016-04-28 20:40 ` Arnd Bergmann
2016-04-28 21:18 ` Bjorn Helgaas
2016-04-28 21:47 ` Jon Masters
2016-04-29 9:41 ` Lorenzo Pieralisi
2016-04-19 21:40 ` Arnd Bergmann
2016-04-20 0:22 ` Jayachandran C
2016-04-15 17:06 ` [PATCH V6 09/13] pci, acpi: Support for ACPI based generic PCI host controller Tomasz Nowicki
2016-04-20 19:12 ` Jayachandran C
2016-04-21 9:06 ` Tomasz Nowicki
2016-04-22 12:49 ` Jayachandran C
2016-04-22 14:40 ` Jon Masters
2016-04-23 15:23 ` Jon Masters
2016-04-28 21:48 ` Bjorn Helgaas
2016-04-29 8:37 ` Lorenzo Pieralisi
2016-04-29 17:35 ` Jayachandran C
2016-05-02 11:31 ` Tomasz Nowicki
2016-05-03 8:46 ` Lorenzo Pieralisi
2016-05-02 11:03 ` Tomasz Nowicki
2016-04-15 17:06 ` [PATCH V6 10/13] arm64, pci, acpi: Start using ACPI based PCI host controller driver for ARM64 Tomasz Nowicki
2016-04-15 17:06 ` [PATCH V6 11/13] pci, acpi: Match PCI config space accessors against platfrom specific quirks Tomasz Nowicki
2016-04-18 11:37 ` liudongdong (C)
2016-04-18 12:21 ` Tomasz Nowicki
2016-04-15 17:06 ` [PATCH V6 12/13] pci, pci-thunder-ecam: Add ACPI support for ThunderX ECAM Tomasz Nowicki
2016-04-19 10:26 ` Tomasz Nowicki
2016-04-19 10:41 ` [Linaro-acpi] " G Gregory
2016-04-19 11:12 ` Graeme Gregory
2016-04-19 11:22 ` Tomasz Nowicki
2016-04-19 12:29 ` G Gregory
2016-04-15 17:06 ` [PATCH V6 13/13] pci, pci-thunder-pem: Add ACPI support for ThunderX PEM Tomasz Nowicki
2016-04-15 18:19 ` [PATCH V6 00/13] Support for generic ACPI based PCI host controller Jon Masters
2016-04-16 15:31 ` Jayachandran C
2016-04-18 13:33 ` Tomasz Nowicki
2016-04-18 14:38 ` Arnd Bergmann
2016-04-18 15:26 ` Tomasz Nowicki
2016-04-18 16:14 ` Mark Langsdorf
2016-04-17 9:23 ` Martinez Kristofer
2016-04-16 18:30 ` Duc Dang
2016-04-17 4:18 ` Sinan Kaya
2016-04-22 16:08 ` Robert Richter
2016-04-22 20:46 ` Suravee Suthikulpanit
2016-04-25 17:23 ` Jeremy Linton
2016-04-26 9:07 ` liudongdong (C)
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