From: Bjorn Helgaas <helgaas@kernel.org>
To: Tomasz Nowicki <tn@semihalf.com>
Cc: arnd@arndb.de, will.deacon@arm.com, catalin.marinas@arm.com,
rafael@kernel.org, hanjun.guo@linaro.org,
Lorenzo.Pieralisi@arm.com, okaya@codeaurora.org,
jiang.liu@linux.intel.com, jchandra@broadcom.com,
robert.richter@caviumnetworks.com, mw@semihalf.com,
Liviu.Dudau@arm.com, ddaney@caviumnetworks.com,
wangyijing@huawei.com, Suravee.Suthikulpanit@amd.com,
msalter@redhat.com, linux-pci@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org,
linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org,
jcm@redhat.com
Subject: Re: [PATCH V6 03/13] x86, ia64: Include acpi_pci_{add|remove}_bus to the default pcibios_{add|remove}_bus implementation.
Date: Tue, 26 Apr 2016 21:34:29 -0500 [thread overview]
Message-ID: <20160427023429.GE6789@localhost> (raw)
In-Reply-To: <1460740008-19489-4-git-send-email-tn@semihalf.com>
On Fri, Apr 15, 2016 at 07:06:38PM +0200, Tomasz Nowicki wrote:
> x86 and ia64 are the only arches that implement pcibios_{add|remove}_bus hooks
> and implement them in the same way. Moreover ARM64 is going to do the same.
> So it seems that acpi_pci_{add|remove}_bus is generic enough to be default
> option for pcibios_{add|remove}_bus hooks. Also, it is always safe to run
> acpi_pci_{add|remove}_bus as they have empty stubs for !ACPI case and
> return if ACPI has been switched off in run time.
>
> After all we can remove x86 and ia64 pcibios_{add|remove}_bus
> implementation.
>
> Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@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>
> ---
> arch/ia64/pci/pci.c | 10 ----------
> arch/x86/pci/common.c | 10 ----------
> drivers/pci/probe.c | 3 +++
> 3 files changed, 3 insertions(+), 20 deletions(-)
>
> diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
> index 978d6af..be4c9ef 100644
> --- a/arch/ia64/pci/pci.c
> +++ b/arch/ia64/pci/pci.c
> @@ -358,16 +358,6 @@ void pcibios_fixup_bus(struct pci_bus *b)
> platform_pci_fixup_bus(b);
> }
>
> -void pcibios_add_bus(struct pci_bus *bus)
> -{
> - acpi_pci_add_bus(bus);
> -}
> -
> -void pcibios_remove_bus(struct pci_bus *bus)
> -{
> - acpi_pci_remove_bus(bus);
> -}
> -
> void pcibios_set_master (struct pci_dev *dev)
> {
> /* No special bus mastering setup handling */
> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
> index 381a43c..7763a84 100644
> --- a/arch/x86/pci/common.c
> +++ b/arch/x86/pci/common.c
> @@ -170,16 +170,6 @@ void pcibios_fixup_bus(struct pci_bus *b)
> pcibios_fixup_device_resources(dev);
> }
>
> -void pcibios_add_bus(struct pci_bus *bus)
> -{
> - acpi_pci_add_bus(bus);
> -}
> -
> -void pcibios_remove_bus(struct pci_bus *bus)
> -{
> - acpi_pci_remove_bus(bus);
> -}
> -
> /*
> * Only use DMI information to set this if nothing was passed
> * on the kernel command line (which was parsed earlier).
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 8087297..ef569e8 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -12,6 +12,7 @@
> #include <linux/slab.h>
> #include <linux/module.h>
> #include <linux/cpumask.h>
> +#include <linux/pci-acpi.h>
> #include <linux/pci-aspm.h>
> #include <linux/aer.h>
> #include <linux/acpi.h>
> @@ -2101,10 +2102,12 @@ int __weak pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
>
> void __weak pcibios_add_bus(struct pci_bus *bus)
> {
> + acpi_pci_add_bus(bus);
> }
>
> void __weak pcibios_remove_bus(struct pci_bus *bus)
> {
> + acpi_pci_remove_bus(bus);
> }
Is this buying us something more than just getting rid of these
pcibios functions in the arches? The arch-specific pcibios methods
by themselves don't seem too onerous, and I don't really want to add
#includes and calls to every firmware interface under the sun.
I admit it's a net removal of 17 lines, but I'm not sure it's a net
reduction in complexity for the reader, who now has to remember that
this ACPI stuff is a no-op on most arches.
As a tangent, some of the stuff in acpi_pci_add_bus() really belongs
elsewhere anyway. For example, the _DSM stuff should probably be in
acpi_pci_root_create() since it's a one-per-host bridge kind of thing.
> struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> --
> 1.9.1
>
next prev parent reply other threads:[~2016-04-27 2:34 UTC|newest]
Thread overview: 106+ 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
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
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 [this message]
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
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
2016-04-17 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)
2016-04-28 21:27 ` [PATCH] acpi: pci: QDF2432 32 bit config space accessors Christopher Covington
2016-04-28 21:35 ` Rafael J. Wysocki
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