linux-kernel - Re: [RFC PATCH] ACPI/PCI: Fix bus range comparation in pci_mcfg

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Date:   Tue, 3 Jan 2017 17:07:10 +0800
From:   Zhou Wang <wangzhou1@...ilicon.com>
To:     Tomasz Nowicki <tn@...ihalf.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Jayachandran C <jchandra@...adcom.com>,
        "Lorenzo Pieralisi" <lorenzo.pieralisi@....com>,
        jorn Helgaas <bhelgaas@...gle.com>
CC:     <liudongdong3@...wei.com>, <gabriele.paoloni@...wei.com>,
        <linux-acpi@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] ACPI/PCI: Fix bus range comparation in
 pci_mcfg_lookup

On 2017/1/3 14:39, Tomasz Nowicki wrote:
> On 22.12.2016 10:07, Zhou Wang wrote:
>> Multiple PCIe host bridges may exists in one PCIe segment. So bus range for each
>> host bridge should be in the coverage of bus range of related PCIe segment.
>>
>> This patch will support this kind of scenario:
>>
>> MCFG:
>>     bus range: 0x00~0xff.
>>     segment: 0.
>> DSDT:
>>     host bridge 1:
>>         bus range: 0x00~0x1f.
>>         segment: 0.
>>     host bridge 2:
>>         bus range: 0x20~0x4f.
>>         segment: 0.
>>
>> Signed-off-by: Zhou Wang <wangzhou1@...ilicon.com>
>> ---
>>  drivers/acpi/pci_mcfg.c | 5 ++---
>>  1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
>> index b5b376e..46a3e32 100644
>> --- a/drivers/acpi/pci_mcfg.c
>> +++ b/drivers/acpi/pci_mcfg.c
>> @@ -40,11 +40,10 @@ phys_addr_t pci_mcfg_lookup(u16 seg, struct resource *bus_res)
>>      struct mcfg_entry *e;
>>
>>      /*
>> -     * We expect exact match, unless MCFG entry end bus covers more than
>> -     * specified by caller.
>> +     * We expect the range in bus_res in the coverage of MCFG bus range.
>>       */
>>      list_for_each_entry(e, &pci_mcfg_list, list) {
>> -        if (e->segment == seg && e->bus_start == bus_res->start &&
>> +        if (e->segment == seg && e->bus_start <= bus_res->start &&
>>              e->bus_end >= bus_res->end)
>>              return e->addr;
>>      }
>>
> 
> Looks good to me.
> 
> Reviewed-by: Tomasz Nowicki <tn@...ihalf.com>

Hi Tomasz,

Thanks for your review.

Regards,
Zhou

> 
> Thanks,
> Tomasz
> 
> .
>