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SubjectRe: [PATCH v8 04/18] iommu: iommu_alloc_resv_region
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On 11.01.2017 10:41, Eric Auger wrote:
> Introduce a new helper serving the purpose to allocate a reserved
> region. This will be used in iommu driver implementing reserved
> region callbacks.
>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>

Reviewed-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>

Thanks,
Tomasz

>
> ---
>
> v3 -> v4:
> - add INIT_LIST_HEAD(&region->list)
> - use int for prot param and add int type param
> - remove implementation outside of CONFIG_IOMMU_API
> ---
> drivers/iommu/iommu.c | 18 ++++++++++++++++++
> include/linux/iommu.h | 2 ++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 1cee5c3..927878d 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -1575,6 +1575,24 @@ void iommu_put_resv_regions(struct device *dev, struct list_head *list)
> ops->put_resv_regions(dev, list);
> }
>
> +struct iommu_resv_region *iommu_alloc_resv_region(phys_addr_t start,
> + size_t length,
> + int prot, int type)
> +{
> + struct iommu_resv_region *region;
> +
> + region = kzalloc(sizeof(*region), GFP_KERNEL);
> + if (!region)
> + return NULL;
> +
> + INIT_LIST_HEAD(&region->list);
> + region->start = start;
> + region->length = length;
> + region->prot = prot;
> + region->type = type;
> + return region;
> +}
> +
> /* Request that a device is direct mapped by the IOMMU */
> int iommu_request_dm_for_dev(struct device *dev)
> {
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 233a6bf..f6bb55d3 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -244,6 +244,8 @@ extern void iommu_set_fault_handler(struct iommu_domain *domain,
> extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
> extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
> extern int iommu_request_dm_for_dev(struct device *dev);
> +extern struct iommu_resv_region *
> +iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, int type);
>
> extern int iommu_attach_group(struct iommu_domain *domain,
> struct iommu_group *group);
>

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