From: Dongdong Liu <liudongdong3@huawei.com>
To: Duc Dang <dhdang@apm.com>, Christopher Covington <cov@codeaurora.org>
Cc: Bjorn Helgaas <helgaas@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
"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>,
<okaya@codeaurora.org>, Jayachandran C <jchandra@broadcom.com>,
Tomasz Nowicki <tn@semihalf.com>,
<robert.richter@caviumnetworks.com>,
Marcin Wojtas <mw@semihalf.com>,
"Liviu Dudau" <Liviu.Dudau@arm.com>,
David Daney <ddaney@caviumnetworks.com>,
"Yijing Wang" <wangyijing@huawei.com>,
Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>,
Mark Salter <msalter@redhat.com>, <linux-pci@vger.kernel.org>,
linux-arm <linux-arm-kernel@lists.infradead.org>,
<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>, <jeremy.linton@arm.com>,
Gabriele Paoloni <gabriele.paoloni@huawei.com>,
<charles.chenxin@huawei.com>, <linuxarm@huawei.com>
Subject: Re: [RFC PATCH V2 1/2] ACPI/PCI: Match PCI config space accessors against platfrom specific ECAM quirks
Date: Tue, 14 Jun 2016 13:51:09 +0800 [thread overview]
Message-ID: <575F9B4D.8080501@huawei.com> (raw)
In-Reply-To: <CADaLNDkfKxxXWmG3eAawH1H=B+4ia6ZYh41anjTuOdTWGbhfNg@mail.gmail.com>
Hi Duc
在 2016/6/14 4:57, Duc Dang 写道:
> On Mon, Jun 13, 2016 at 8:47 AM, Christopher Covington
> <cov@codeaurora.org> wrote:
>> Hi Dongdong,
>>
>> On 06/13/2016 09:02 AM, Dongdong Liu wrote:
>>> diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
>>> index d3c3e85..49612b3 100644
>>> --- a/drivers/acpi/pci_mcfg.c
>>> +++ b/drivers/acpi/pci_mcfg.c
>>> @@ -22,6 +22,10 @@
>>> #include <linux/kernel.h>
>>> #include <linux/pci.h>
>>> #include <linux/pci-acpi.h>
>>> +#include <linux/pci-ecam.h>
>>> +
>>> +/* Root pointer to the mapped MCFG table */
>>> +static struct acpi_table_mcfg *mcfg_table;
>>>
>>> /* Structure to hold entries from the MCFG table */
>>> struct mcfg_entry {
>>> @@ -35,6 +39,38 @@ struct mcfg_entry {
>>> /* List to save mcfg entries */
>>> static LIST_HEAD(pci_mcfg_list);
>>>
>>> +extern struct pci_cfg_fixup __start_acpi_mcfg_fixups[];
>>> +extern struct pci_cfg_fixup __end_acpi_mcfg_fixups[];
>>> +
>>> +struct pci_ecam_ops *pci_mcfg_get_ops(struct acpi_pci_root *root)
>>> +{
>>> + int bus_num = root->secondary.start;
>>> + int domain = root->segment;
>>> + struct pci_cfg_fixup *f;
>>> +
>>> + if (!mcfg_table)
>>> + return &pci_generic_ecam_ops;
>>> +
>>> + /*
>>> + * Match against platform specific quirks and return corresponding
>>> + * CAM ops.
>>> + *
>>> + * First match against PCI topology <domain:bus> then use OEM ID and
>>> + * OEM revision from MCFG table standard header.
>>> + */
>>> + for (f = __start_acpi_mcfg_fixups; f < __end_acpi_mcfg_fixups; f++) {
>>> + if ((f->domain == domain || f->domain == PCI_MCFG_DOMAIN_ANY) &&
>>> + (f->bus_num == bus_num || f->bus_num == PCI_MCFG_BUS_ANY) &&
>>> + (!strncmp(f->oem_id, mcfg_table->header.oem_id,
>>> + ACPI_OEM_ID_SIZE)) &&
>>> + (!strncmp(f->oem_table_id, mcfg_table->header.oem_table_id,
>>> + ACPI_OEM_TABLE_ID_SIZE)))
>>
>> This would just be a small convenience, but if the character count used here were
>>
>> min(strlen(f->oem_id), ACPI_OEM_ID_SIZE)
>>
>> then the parameters to DECLARE_ACPI_MCFG_FIXUP macro could be substrings and
>> wouldn't need to be padded out to the full length.
>>
>>> + return f->ops;
>>> + }
>>> + /* No quirks, use ECAM */
>>> + return &pci_generic_ecam_ops;
>>> +}
>>
>>> diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
>>> index 7d63a66..088a1da 100644
>>> --- a/include/linux/pci-acpi.h
>>> +++ b/include/linux/pci-acpi.h
>>> @@ -25,6 +25,7 @@ static inline acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
>>> extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle);
>>>
>>> extern phys_addr_t pci_mcfg_lookup(u16 domain, struct resource *bus_res);
>>> +extern struct pci_ecam_ops *pci_mcfg_get_ops(struct acpi_pci_root *root);
>>>
>>> static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
>>> {
>>> @@ -72,6 +73,25 @@ struct acpi_pci_root_ops {
>>> int (*prepare_resources)(struct acpi_pci_root_info *info);
>>> };
>>>
>>> +struct pci_cfg_fixup {
>>> + struct pci_ecam_ops *ops;
>>> + char *oem_id;
>>> + char *oem_table_id;
>>> + int domain;
>>> + int bus_num;
>>> +};
>>> +
>>> +#define PCI_MCFG_DOMAIN_ANY -1
>>> +#define PCI_MCFG_BUS_ANY -1
>>> +
>>> +/* Designate a routine to fix up buggy MCFG */
>>> +#define DECLARE_ACPI_MCFG_FIXUP(ops, oem_id, oem_table_id, dom, bus) \
>>> + static const struct pci_cfg_fixup \
>>> + __mcfg_fixup_##oem_id##oem_table_id##dom##bus \
>>
>> I'm not entirely sure that this is the right fix--I'm pretty blindly
>> following a GCC documentation suggestion [1]--but removing the first two
>> preprocessor concatenation operators "##" solved the following build error
>> for me.
>>
>> include/linux/pci-acpi.h:90:2: error: pasting "__mcfg_fixup_" and ""QCOM"" does not give a valid preprocessing token
>> __mcfg_fixup_##oem_id##oem_table_id##dom##bus \
>
> I think the problem is gcc is not happy with quoted string when
> processing these tokens
> (""QCOM"", the extra "" are added by gcc). So should we not concat
> string tokens and
> use the fixup definition in v1 of this RFC:
> /* Designate a routine to fix up buggy MCFG */
> #define DECLARE_ACPI_MCFG_FIXUP(ops, oem_id, rev, dom, bus) \
> static const struct pci_cfg_fixup __mcfg_fixup_##system##dom##bus\
> __used __attribute__((__section__(".acpi_fixup_mcfg"), \
> aligned((sizeof(void *))))) = \
> { ops, oem_id, rev, dom, bus };
V1 fixup exist the redefinition error when compiling mutiple DECLARE_ACPI_MCFG_FIXUP
with the same PCI_MCFG_DOMAIN_ANY and PCI_MCFG_BUS_ANY.
#define EFI_ACPI_HISI_OEM_ID "HISI"
#define EFI_ACPI_HISI_D02_OEM_TABLE_ID "HISI-D02"
#define EFI_ACPI_HISI_D03_OEM_TABLE_ID "HISI-D03"
DECLARE_ACPI_MCFG_FIXUP(&hisi_pcie_ecam_ops, EFI_ACPI_HISI_OEM_ID,
EFI_ACPI_HISI_D02_OEM_TABLE_ID, PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY);
DECLARE_ACPI_MCFG_FIXUP(&hisi_pcie_ecam_ops, EFI_ACPI_HISI_OEM_ID,
EFI_ACPI_HISI_D03_OEM_TABLE_ID, PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY);
In file included from drivers/pci/host/pcie-hisi-acpi.c:15:0:
include/linux/pci-acpi.h:98:43: error: redefinition of '__mcfg_fixup_systemPCI_MCFG_DOMAIN_ANYPCI_MCFG_BUS_ANY'
static const struct pci_cfg_fixup __mcfg_fixup_##system##dom##bus\
^
drivers/pci/host/pcie-hisi-acpi.c:215:1: note: in expansion of macro 'DECLARE_ACPI_MCFG_FIXUP'
DECLARE_ACPI_MCFG_FIXUP(&hisi_pcie_ecam_ops, EFI_ACPI_HISI_OEM_ID,
^
include/linux/pci-acpi.h:98:43: note: previous definition of '__mcfg_fixup_systemPCI_MCFG_DOMAIN_ANYPCI_MCFG_BUS_ANY' was here
static const struct pci_cfg_fixup __mcfg_fixup_##system##dom##bus\
^
drivers/pci/host/pcie-hisi-acpi.c:212:1: note: in expansion of macro 'DECLARE_ACPI_MCFG_FIXUP'
V2 fixup can resolve the redefinition error, but need to use macro.
We can see that the name of macro is not replace with it's value in
"__mcfg_fixup_EFI_ACPI_HISI_OEM_IDEFI_ACPI_HISI_D03_OEM_TABLE_IDPCI_MCFG_DOMAIN_ANYPCI_MCFG_BUS_ANY".
Any good idea is appreciated.
Thanks
Dongdong
>
> Regards,
> Duc Dang.
>
>
>> ^
>> arch/arm64/kernel/pci.c:225:1: note: in expansion of macro ‘DECLARE_ACPI_MCFG_FIXUP’
>> DECLARE_ACPI_MCFG_FIXUP(&pci_32b_ecam_ops, "QCOM", "QDF2432", PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY);
>> ^
>> arch/arm64/kernel/pci.c:225:44: error: pasting ""QCOM"" and ""QDF2432"" does not give a valid preprocessing token
>> DECLARE_ACPI_MCFG_FIXUP(&pci_32b_ecam_ops, "QCOM", "QDF2432", PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY);
>> ^
>> include/linux/pci-acpi.h:90:17: note: in definition of macro ‘DECLARE_ACPI_MCFG_FIXUP’
>> __mcfg_fixup_##oem_id##oem_table_id##dom##bus \
>> ^
>> arch/arm64/kernel/pci.c:225:52: error: pasting ""QDF2432"" and "PCI_MCFG_DOMAIN_ANY" does not give a valid preprocessi
>> ng token
>> DECLARE_ACPI_MCFG_FIXUP(&pci_32b_ecam_ops, "QCOM", "QDF2432", PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY);
>> ^
>> include/linux/pci-acpi.h:90:25: note: in definition of macro ‘DECLARE_ACPI_MCFG_FIXUP’
>> __mcfg_fixup_##oem_id##oem_table_id##dom##bus \
>> ^
>> arch/arm64/kernel/pci.c:225:44: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before string constant
>> DECLARE_ACPI_MCFG_FIXUP(&pci_32b_ecam_ops, "QCOM", "QDF2432", PCI_MCFG_DOMAIN_ANY, PCI_MCFG_BUS_ANY);
>> ^
>> include/linux/pci-acpi.h:90:17: note: in definition of macro ‘DECLARE_ACPI_MCFG_FIXUP’
>> __mcfg_fixup_##oem_id##oem_table_id##dom##bus \
>> ^
>> make[1]: *** [arch/arm64/kernel/pci.o] Error 1
>> make: *** [arch/arm64/kernel] Error 2
>>
>> 1. https://gcc.gnu.org/onlinedocs/cpp/Concatenation.html#Concatenation
>>
>>> + __used __attribute__((__section__(".acpi_fixup_mcfg"), \
>>> + aligned((sizeof(void *))))) = \
>>> + { ops, oem_id, oem_table_id, dom, bus };
>>> +
>>> extern int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info);
>>> extern struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
>>> struct acpi_pci_root_ops *ops,
>>>
>>
>> Thanks,
>> Cov
>>
>> --
>> Qualcomm Innovation Center, Inc.
>> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
>> a Linux Foundation Collaborative Project
>
> .
>
next prev parent reply other threads:[~2016-06-14 5:52 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-13 13:02 [RFC PATCH V2 0/2] ECAM quirks handling for ARM64 platforms Dongdong Liu
2016-06-13 13:02 ` [RFC PATCH V2 1/2] ACPI/PCI: Match PCI config space accessors against platfrom specific ECAM quirks Dongdong Liu
2016-06-13 13:54 ` Gabriele Paoloni
2016-06-13 14:02 ` Sinan Kaya
2016-06-13 14:29 ` Gabriele Paoloni
2016-06-13 15:12 ` okaya
2016-06-13 15:59 ` Jeffrey Hugo
2016-06-13 21:07 ` Duc Dang
2016-06-16 6:31 ` [Linaro-acpi] " Jon Masters
2016-06-16 7:45 ` Duc Dang
2016-06-16 7:54 ` Jon Masters
2016-06-13 15:47 ` Christopher Covington
2016-06-13 20:57 ` Duc Dang
2016-06-14 5:51 ` Dongdong Liu [this message]
2016-06-14 9:00 ` Duc Dang
2016-06-14 9:45 ` Dongdong Liu
2016-06-14 11:52 ` Tomasz Nowicki
2016-06-14 17:43 ` Duc Dang
2016-06-13 13:02 ` [RFC PATCH V2 2/2] ARM64/PCI: Start using quirks handling for ACPI based PCI host controller Dongdong Liu
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=575F9B4D.8080501@huawei.com \
--to=liudongdong3@huawei.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=charles.chenxin@huawei.com \
--cc=cov@codeaurora.org \
--cc=ddaney@caviumnetworks.com \
--cc=dhdang@apm.com \
--cc=gabriele.paoloni@huawei.com \
--cc=hanjun.guo@linaro.org \
--cc=helgaas@kernel.org \
--cc=jchandra@broadcom.com \
--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=linuxarm@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).