From: Jayachandran C <jchandra@broadcom.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Tomasz Nowicki <tn@semihalf.com>,
Bjorn Helgaas <helgaas@kernel.org>,
Will Deacon <will.deacon@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Rafael Wysocki <rafael@kernel.org>,
Hanjun Guo <hanjun.guo@linaro.org>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
Sinan Kaya <okaya@codeaurora.org>,
robert.richter@caviumnetworks.com,
Marcin Wojtas <mw@semihalf.com>,
Liviu.Dudau@arm.com, David Daney <ddaney@caviumnetworks.com>,
Wangyijing <wangyijing@huawei.com>,
Suravee Suthikulanit <Suravee.Suthikulpanit@amd.com>,
Mark Salter <msalter@redhat.com>,
Linux PCI <linux-pci@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linaro-acpi@lists.linaro.org, Jon Masters <jcm@redhat.com>,
Andrea Gallo <andrea.gallo@linaro.org>, Duc Dang <dhdang@apm.com>,
jeremy.linton@arm.com, liudongdong3@huawei.com,
Christopher Covington <cov@codeaurora.org>
Subject: Re: [PATCH V8 9/9] pci, acpi: ARM64 support for ACPI based generic PCI host controller
Date: Mon, 30 May 2016 21:43:58 +0530 [thread overview]
Message-ID: <CAKc_7PW3Hdk9zTZ53yhGVdeeFVGFaFExZEvp456s16DnnMMjWg@mail.gmail.com> (raw)
In-Reply-To: <8385994.W7ve9PrvHG@wuerfel>
On Mon, May 30, 2016 at 9:08 PM, Arnd Bergmann <arnd@arndb.de> wrote:
> On Monday, May 30, 2016 5:14:22 PM CEST Tomasz Nowicki wrote:
>> + bsz = 1 << pci_generic_ecam_ops.bus_shift;
>> + cfgres.start = root->mcfg_addr + bus_res->start * bsz;
>> + cfgres.end = cfgres.start + resource_size(bus_res) * bsz - 1;
>> + cfgres.flags = IORESOURCE_MEM;
>> + cfg = pci_ecam_create(&root->device->dev, &cfgres, bus_res,
>> + &pci_generic_ecam_ops);
>> + if (IS_ERR(cfg)) {
>> + pr_err("%04x:%pR error %ld mapping CAM\n", seg, bus_res,
>> + PTR_ERR(cfg));
>> + return PTR_ERR(cfg);
>> + }
>> +
>> + ri->cfg = cfg;
>> + return 0;
>> +}
>
> I wonder if we could do this a little simpler and just put a pointer
> to the mmconfig space into struct pci_host_bridge, and then have a trivial
> map_bus function alongside pci_generic_config_read/pci_generic_config_write.
>
> As this code is specific to arch/arm64, we don't need any of the complexity
> of drivers/pci/ecam.c, which basically only exists to work around the
> limited virtual address space of 32-bit machines.
The map_bus provided by pci-ecam.h is already trivial in 64bit case,
it was written so that it could be optimized at compile time. The
pci_ecam_create is a useful to have here instead of redoing the
request_resource/ioremap sequence.
The struct pci_config_window can be moved into struct
pci_host_bridge (or a wrapper of pci_host_bridge) when we have
the setup to point bus->sysdata to something like that. The ECAM
API can be fixed up to handle that case as well. I did not make
any changes since the pci_host_bridge discussion is still going on.
JC.
next prev parent reply other threads:[~2016-05-30 16:14 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-30 15:14 [PATCH V8 0/9] Support for ARM64 ACPI based PCI host controller Tomasz Nowicki
2016-05-30 15:14 ` [PATCH V8 1/9] PCI: ecam: move ecam.h to linux/include/pci-ecam.h Tomasz Nowicki
2016-06-02 9:48 ` Lorenzo Pieralisi
2016-05-30 15:14 ` [PATCH V8 2/9] PCI: ecam: Add parent device field to pci_config_window Tomasz Nowicki
2016-06-02 10:13 ` Lorenzo Pieralisi
2016-05-30 15:14 ` [PATCH V8 3/9] pci: Add new function to unmap IO resources Tomasz Nowicki
2016-06-02 16:50 ` Lorenzo Pieralisi
2016-05-30 15:14 ` [PATCH V8 4/9] acpi, pci: Support IO resources when parsing PCI host bridge resources Tomasz Nowicki
2016-06-02 17:30 ` Lorenzo Pieralisi
2016-06-07 23:56 ` Bjorn Helgaas
2016-05-30 15:14 ` [PATCH V8 5/9] pci, acpi: add acpi hook to assign domain number Tomasz Nowicki
2016-06-08 0:15 ` Bjorn Helgaas
2016-06-08 10:21 ` Tomasz Nowicki
2016-06-08 13:22 ` Bjorn Helgaas
2016-06-10 15:14 ` Lorenzo Pieralisi
2016-06-10 15:49 ` Lorenzo Pieralisi
2016-06-10 16:49 ` Tomasz Nowicki
2016-06-10 18:18 ` Bjorn Helgaas
2016-06-10 18:54 ` Jon Masters
2016-05-30 15:14 ` [PATCH V8 6/9] arm64, pci, acpi: ACPI support for legacy IRQs parsing and consolidation with DT code Tomasz Nowicki
2016-05-30 15:14 ` [PATCH V8 7/9] acpi: Add generic MCFG table handling Tomasz Nowicki
2016-06-03 11:38 ` Lorenzo Pieralisi
2016-06-06 12:55 ` Tomasz Nowicki
2016-06-08 1:56 ` Bjorn Helgaas
2016-06-08 12:21 ` Tomasz Nowicki
2016-06-08 13:17 ` Bjorn Helgaas
2016-06-08 13:44 ` Tomasz Nowicki
2016-05-30 15:14 ` [PATCH V8 8/9] arm64, pci, acpi: Provide ACPI-specific prerequisites for PCI bus enumeration Tomasz Nowicki
2016-06-02 9:45 ` Lorenzo Pieralisi
2016-06-02 9:51 ` Tomasz Nowicki
2016-05-30 15:14 ` [PATCH V8 9/9] pci, acpi: ARM64 support for ACPI based generic PCI host controller Tomasz Nowicki
2016-05-30 15:38 ` Arnd Bergmann
2016-05-30 16:13 ` Jayachandran C [this message]
2016-06-02 9:35 ` Lorenzo Pieralisi
2016-06-02 9:44 ` Tomasz Nowicki
2016-06-08 2:14 ` Bjorn Helgaas
2016-06-01 7:36 ` [PATCH V8 0/9] Support for ARM64 ACPI based " Gabriele Paoloni
2016-06-02 7:31 ` Jon Masters
2016-06-02 10:06 ` Gabriele Paoloni
2016-06-02 8:52 ` Tomasz Nowicki
2016-06-02 9:58 ` Gabriele Paoloni
2016-06-02 8:48 ` Jon Masters
2016-06-07 23:13 ` Bjorn Helgaas
2016-06-08 9:20 ` Dongdong Liu
2016-06-09 16:45 ` Suravee Suthikulanit
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAKc_7PW3Hdk9zTZ53yhGVdeeFVGFaFExZEvp456s16DnnMMjWg@mail.gmail.com \
--to=jchandra@broadcom.com \
--cc=Liviu.Dudau@arm.com \
--cc=Lorenzo.Pieralisi@arm.com \
--cc=Suravee.Suthikulpanit@amd.com \
--cc=andrea.gallo@linaro.org \
--cc=arnd@arndb.de \
--cc=catalin.marinas@arm.com \
--cc=cov@codeaurora.org \
--cc=ddaney@caviumnetworks.com \
--cc=dhdang@apm.com \
--cc=hanjun.guo@linaro.org \
--cc=helgaas@kernel.org \
--cc=jcm@redhat.com \
--cc=jeremy.linton@arm.com \
--cc=linaro-acpi@lists.linaro.org \
--cc=linux-acpi@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=liudongdong3@huawei.com \
--cc=msalter@redhat.com \
--cc=mw@semihalf.com \
--cc=okaya@codeaurora.org \
--cc=rafael@kernel.org \
--cc=robert.richter@caviumnetworks.com \
--cc=tn@semihalf.com \
--cc=wangyijing@huawei.com \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).