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    Subject[RFC v3 04/10] iommu: iommu_alloc_resv_region
    Date
    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>
    ---
    drivers/iommu/iommu.c | 16 ++++++++++++++++
    include/linux/iommu.h | 8 ++++++++
    2 files changed, 24 insertions(+)

    diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
    index c7ed334..6ee529f 100644
    --- a/drivers/iommu/iommu.c
    +++ b/drivers/iommu/iommu.c
    @@ -1562,6 +1562,22 @@ 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,
    + unsigned int prot)
    +{
    + struct iommu_resv_region *region;
    +
    + region = kzalloc(sizeof(*region), GFP_KERNEL);
    + if (!region)
    + return NULL;
    +
    + region->start = start;
    + region->length = length;
    + region->prot = prot;
    + 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 02cf565..0aea877 100644
    --- a/include/linux/iommu.h
    +++ b/include/linux/iommu.h
    @@ -241,6 +241,8 @@ 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, unsigned int prot);

    extern int iommu_attach_group(struct iommu_domain *domain,
    struct iommu_group *group);
    @@ -454,6 +456,12 @@ static inline void iommu_put_resv_regions(struct device *dev,
    {
    }

    +static inline struct iommu_resv_region *
    +iommu_alloc_resv_region(phys_addr_t start, size_t length, unsigned int prot)
    +{
    + return NULL;
    +}
    +
    static inline int iommu_request_dm_for_dev(struct device *dev)
    {
    return -ENODEV;
    --
    1.9.1
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