linux-kernel - Re: [PATCH v3, part2 17/20] PCI, iommu: use hotplug-safe iterators to walk PCI buses

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Message-ID: <51C08C2D.6080208@gmail.com>
Date:	Wed, 19 Jun 2013 00:34:53 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Don Dutile <ddutile@...hat.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, Joerg Roedel <joro@...tes.org>,
	Ingo Molnar <mingo@...nel.org>, Hannes Reinecke <hare@...e.de>,
	"Li, Zhen-Hua" <zhen-hual@...com>, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH v3, part2 17/20] PCI, iommu: use hotplug-safe iterators
 to walk PCI buses

On 06/18/2013 04:34 AM, Don Dutile wrote:
> On 06/17/2013 04:20 PM, Bjorn Helgaas wrote:
>> On Sun, May 26, 2013 at 11:53:14PM +0800, Jiang Liu wrote:
>>> Enhance iommu drviers to use hotplug-safe iterators to walk
>>> PCI buses.
>>>
>>> Signed-off-by: Jiang Liu<jiang.liu@...wei.com>
>>> Cc: Joerg Roedel<joro@...tes.org>
>>> Cc: Ingo Molnar<mingo@...nel.org>
>>> Cc: Donald Dutile<ddutile@...hat.com>
>>> Cc: Hannes Reinecke<hare@...e.de>
>>> Cc: "Li, Zhen-Hua"<zhen-hual@...com>
>>> Cc: iommu@...ts.linux-foundation.org
>>> Cc: linux-kernel@...r.kernel.org
>>> ---
>>>   drivers/iommu/amd_iommu.c | 4 +++-
>>>   drivers/iommu/dmar.c      | 6 ++++--
>>
>> The AMD and Intel IOMMU drivers are very different, and I would
>> split this into a patch for each.
>>
> +1
Hi Don and Bjorn,

Thanks for review, will split it into two patches.
Regards!
Gerry
> 
>>>   2 files changed, 7 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
>>> index 21d02b0..eef7a7e 100644
>>> --- a/drivers/iommu/amd_iommu.c
>>> +++ b/drivers/iommu/amd_iommu.c
>>> @@ -352,6 +352,7 @@ static int init_iommu_group(struct device *dev)
>>>       struct iommu_dev_data *dev_data;
>>>       struct iommu_group *group;
>>>       struct pci_dev *dma_pdev;
>>> +    struct pci_bus *b = NULL;
>>>       int ret;
>>>
>>>       group = iommu_group_get(dev);
>>> @@ -388,7 +389,7 @@ static int init_iommu_group(struct device *dev)
>>>            * the alias.  Be careful to also test the parent device if
>>>            * we think the alias is the root of the group.
>>>            */
>>> -        bus = pci_find_bus(0, alias>>  8);
>>> +        b = bus = pci_get_bus(0, alias>>  8);
>>>           if (!bus)
>>>               goto use_group;
>>>
>>> @@ -408,6 +409,7 @@ static int init_iommu_group(struct device *dev)
>>>       dma_pdev = get_isolation_root(pci_dev_get(to_pci_dev(dev)));
>>>   use_pdev:
>>>       ret = use_pdev_iommu_group(dma_pdev, dev);
>>> +    pci_bus_put(b);
>>>       pci_dev_put(dma_pdev);
>>>       return ret;
>>>   use_group:
>>> diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
>>> index a7967ce..7162787 100644
>>> --- a/drivers/iommu/dmar.c
>>> +++ b/drivers/iommu/dmar.c
>>> @@ -67,12 +67,12 @@ static void __init dmar_register_drhd_unit(struct
>>> dmar_drhd_unit *drhd)
>>>   static int __init dmar_parse_one_dev_scope(struct
>>> acpi_dmar_device_scope *scope,
>>>                          struct pci_dev **dev, u16 segment)
>>>   {
>>> -    struct pci_bus *bus;
>>> +    struct pci_bus *b, *bus;
>>>       struct pci_dev *pdev = NULL;
>>>       struct acpi_dmar_pci_path *path;
>>>       int count;
>>>
>>> -    bus = pci_find_bus(segment, scope->bus);
>>> +    b = bus = pci_get_bus(segment, scope->bus);
>>>       path = (struct acpi_dmar_pci_path *)(scope + 1);
>>>       count = (scope->length - sizeof(struct acpi_dmar_device_scope))
>>>           / sizeof(struct acpi_dmar_pci_path);
>>> @@ -97,6 +97,8 @@ static int __init dmar_parse_one_dev_scope(struct
>>> acpi_dmar_device_scope *scope,
>>>           count --;
>>>           bus = pdev->subordinate;
>>>       }
>>> +    pci_bus_put(b);
>>> +
>>>       if (!pdev) {
>>>           pr_warn("Device scope device [%04x:%02x:%02x.%02x] not
>>> found\n",
>>>               segment, scope->bus, path->dev, path->fn);
>>> -- 
>>> 1.8.1.2
>>>
> 

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