Re: [PATCH v14 08/22] vfio iommu type1: Add find_iommu_group() function

[Kirti Wankhede <kwankhede@nvidia.com>]

Hi Eric,

Thanks for your reviews.
Alex had already pulled this series into his next branch for v4.10.

http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1274745.html

Thanks,
Kirti

On 11/21/2016 4:59 PM, Auger Eric wrote:
> Hi,
> On 16/11/2016 21:46, Kirti Wankhede wrote:
>> Add find_iommu_group()
>>
>> Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
>> Signed-off-by: Neo Jia <cjia@nvidia.com>
>> Reviewed-by: Jike Song <jike.song@intel.com>
>> Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
>>
>> Change-Id: I9d372f1ebe9eb01a5a21374b8a2b03f7df73601f
>> ---
>>  drivers/vfio/vfio_iommu_type1.c | 57 ++++++++++++++++++++++++-----------------
>>  1 file changed, 33 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>> index 52af5fc01d91..ffe2026f1341 100644
>> --- a/drivers/vfio/vfio_iommu_type1.c
>> +++ b/drivers/vfio/vfio_iommu_type1.c
>> @@ -752,11 +752,24 @@ static void vfio_test_domain_fgsp(struct vfio_domain *domain)
>>  	__free_pages(pages, order);
>>  }
>>  
>> +static struct vfio_group *find_iommu_group(struct vfio_domain *domain,
>> +					   struct iommu_group *iommu_group)
>> +{
>> +	struct vfio_group *g;
>> +
>> +	list_for_each_entry(g, &domain->group_list, next) {
>> +		if (g->iommu_group == iommu_group)
>> +			return g;
>> +	}
>> +
>> +	return NULL;
>> +}
>> +
>>  static int vfio_iommu_type1_attach_group(void *iommu_data,
>>  					 struct iommu_group *iommu_group)
>>  {
>>  	struct vfio_iommu *iommu = iommu_data;
>> -	struct vfio_group *group, *g;
>> +	struct vfio_group *group;
>>  	struct vfio_domain *domain, *d;
>>  	struct bus_type *bus = NULL;
>>  	int ret;
>> @@ -764,10 +777,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
>>  	mutex_lock(&iommu->lock);
>>  
>>  	list_for_each_entry(d, &iommu->domain_list, next) {
>> -		list_for_each_entry(g, &d->group_list, next) {
>> -			if (g->iommu_group != iommu_group)
>> -				continue;
>> -
>> +		if (find_iommu_group(d, iommu_group)) {
>>  			mutex_unlock(&iommu->lock);
>>  			return -EINVAL;
>>  		}
>> @@ -887,27 +897,26 @@ static void vfio_iommu_type1_detach_group(void *iommu_data,
>>  	mutex_lock(&iommu->lock);
>>  
>>  	list_for_each_entry(domain, &iommu->domain_list, next) {
>> -		list_for_each_entry(group, &domain->group_list, next) {
>> -			if (group->iommu_group != iommu_group)
>> -				continue;
>> +		group = find_iommu_group(domain, iommu_group);
>> +		if (!group)
>> +			continue;
>>  
>> -			iommu_detach_group(domain->domain, iommu_group);
>> -			list_del(&group->next);
>> -			kfree(group);
>> -			/*
>> -			 * Group ownership provides privilege, if the group
>> -			 * list is empty, the domain goes away.  If it's the
>> -			 * last domain, then all the mappings go away too.
>> -			 */
>> -			if (list_empty(&domain->group_list)) {
>> -				if (list_is_singular(&iommu->domain_list))
>> -					vfio_iommu_unmap_unpin_all(iommu);
>> -				iommu_domain_free(domain->domain);
>> -				list_del(&domain->next);
>> -				kfree(domain);
>> -			}
>> -			goto done;
>> +		iommu_detach_group(domain->domain, iommu_group);
>> +		list_del(&group->next);
>> +		kfree(group);
>> +		/*
>> +		 * Group ownership provides privilege, if the group
>> +		 * list is empty, the domain goes away.  If it's the
>> +		 * last domain, then all the mappings go away too.
>> +		 */
>> +		if (list_empty(&domain->group_list)) {
>> +			if (list_is_singular(&iommu->domain_list))
>> +				vfio_iommu_unmap_unpin_all(iommu);
>> +			iommu_domain_free(domain->domain);
>> +			list_del(&domain->next);
>> +			kfree(domain);
>>  		}
>> +		goto done;
>>  	}
>>  
>>  done:
>>
> Reviewed-by: Eric Auger <eric.auger@redhat.com>
> 
> Eric
>