linux-kernel - Re: [RFC PATCH v2, part3 07/11] PCI, xen-pcifront: use new PCI interfaces to simplify implementation

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Date:	Fri, 07 Jun 2013 23:50:49 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC PATCH v2, part3 07/11] PCI, xen-pcifront: use new PCI interfaces
 to simplify implementation

On Fri 07 Jun 2013 10:50:24 PM CST, Konrad Rzeszutek Wilk wrote:
> On Thu, May 16, 2013 at 11:50:55PM +0800, Jiang Liu wrote:
>> Use new PCI interfaces to simplify xen-pcifront implementation:
>> 1) Use pci_create_root_bus() instead of pci_scan_bus_parented()
>>    because pci_scan_bus_parented() is marked as __deprecated.This
>>    also gets rid of a duplicated call of pci_bus_start_devices().
>> 2) Use pci_stop_root_bus() and pci_remove_root_bus() instead of
>>    open-coded private implementation.
>> 3) Use pci_set_host_bridge_release() to release data structures
>>    associated with PCI root buses.
>> 4) Use pci_bus_get()/pci_bus_put() to manage PCI root bus reference
>>    count.
>>
>> This is also a preparation for coming PCI bus lock enhancement.
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
>> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
>> Cc: Jeremy Fitzhardinge <jeremy@...p.org>
>> Cc: xen-devel@...ts.xensource.com
>> Cc: virtualization@...ts.linux-foundation.org
>> Cc: linux-pci@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> ---
>>  drivers/pci/xen-pcifront.c | 81 ++++++++++++++++++++++------------------------
>>  1 file changed, 39 insertions(+), 42 deletions(-)
>>
>> diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
>> index 816cf94..6aa2c0f 100644
>> --- a/drivers/pci/xen-pcifront.c
>> +++ b/drivers/pci/xen-pcifront.c
......
>> @@ -480,12 +490,14 @@ static int pcifront_scan_root(struct pcifront_device *pdev,
>>  		goto err_out;
>>  	}
>>
>> -	bus_entry->bus = b;
>> +	pci_set_host_bridge_release(to_pci_host_bridge(b->bridge),
>> +				    pcifront_release_sd, sd);
>>
>> -	list_add(&bus_entry->list, &pdev->root_buses);
>> -
>> -	/* pci_scan_bus_parented skips devices which do not have a have
>> -	* devfn==0. The pcifront_scan_bus enumerates all devfn. */
>> +	/*
>> +	 * Every PCI physical device should have function 0, but that's not
>> +	 * true for xen.
>
> That is incorrect. There are two types of backends - one of them will
> start at zero, but the other might not.
Hi Konrad,
      Forgive my poor knowledge about Xen:(, so I will skip this change.
Regards!
Gerry
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