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

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Date:   Wed, 4 Jan 2017 13:44:44 +0800
From:   Zhou Wang <wangzhou1@...ilicon.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Tomasz Nowicki <tn@...ihalf.com>,
        Jayachandran C <jchandra@...adcom.com>,
        jorn Helgaas <bhelgaas@...gle.com>, <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 20:00, Lorenzo Pieralisi wrote:
> On Thu, Dec 22, 2016 at 05:07:43PM +0800, 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.
> 
> "The configuration data provided by an MCFG region (ie PCI segment and
> bus range) may span multiple host bridges.
> 
> Current code in pci_mcfg_lookup() carries out an exact match of host
> bridge bus range start value against the MCFG region(s) bus range start
> value which would cause configurations like the following:
> 
> MCFG region:
> 	bus range: 0x00~0xff.
> 	segment: 0.
> 
> PCI host bridges configuration (segment numbers and bus ranges):
> 	host bridge 1:
> 		bus range: 0x00~0x1f.
> 		segment: 0.
> 	host bridge 2:
> 		bus range: 0x20~0x4f.
> 		segment: 0.
> 
> to fail, in that the bus range start value for host bridge 2 does
> not match the bus range start value of the respective MCFG region.
> 
> Relax the bus range check in pci_mcfg_lookup() to cater for
> PCI configurations with multiple host bridges sharing the same
> MCFG region."
> 
> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>

Hi Lorenzo,

Thanks for your view.

I will modify the commit message and post a new version patch.

Regards,
Zhou

> 
>> 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;
>>  	}
>> -- 
>> 1.9.1
>>
> 
> .
>