Patchwork [v3,part2,17/20] PCI, iommu: use hotplug-safe iterators to walk PCI buses

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Submitter Jiang Liu
Date May 26, 2013, 3:53 p.m.
Message ID <1369583597-3801-18-git-send-email-jiang.liu@huawei.com>
Download mbox | patch
Permalink /patch/246421/
State Rejected
Headers show

Comments

Jiang Liu - May 26, 2013, 3:53 p.m.
Enhance iommu drviers to use hotplug-safe iterators to walk
PCI buses.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Donald Dutile <ddutile@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: "Li, Zhen-Hua" <zhen-hual@hp.com>
Cc: iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/iommu/amd_iommu.c | 4 +++-
 drivers/iommu/dmar.c      | 6 ++++--
 2 files changed, 7 insertions(+), 3 deletions(-)
Bjorn Helgaas - June 17, 2013, 8:20 p.m.
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@huawei.com>
> Cc: Joerg Roedel <joro@8bytes.org>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Donald Dutile <ddutile@redhat.com>
> Cc: Hannes Reinecke <hare@suse.de>
> Cc: "Li, Zhen-Hua" <zhen-hual@hp.com>
> Cc: iommu@lists.linux-foundation.org
> Cc: linux-kernel@vger.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.

>  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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Don Dutile - June 17, 2013, 8:34 p.m.
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@huawei.com>
>> Cc: Joerg Roedel<joro@8bytes.org>
>> Cc: Ingo Molnar<mingo@kernel.org>
>> Cc: Donald Dutile<ddutile@redhat.com>
>> Cc: Hannes Reinecke<hare@suse.de>
>> Cc: "Li, Zhen-Hua"<zhen-hual@hp.com>
>> Cc: iommu@lists.linux-foundation.org
>> Cc: linux-kernel@vger.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

>>   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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Jiang Liu - June 18, 2013, 4:34 p.m.
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@huawei.com>
>>> Cc: Joerg Roedel<joro@8bytes.org>
>>> Cc: Ingo Molnar<mingo@kernel.org>
>>> Cc: Donald Dutile<ddutile@redhat.com>
>>> Cc: Hannes Reinecke<hare@suse.de>
>>> Cc: "Li, Zhen-Hua"<zhen-hual@hp.com>
>>> Cc: iommu@lists.linux-foundation.org
>>> Cc: linux-kernel@vger.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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Patch

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);