On 15/11/16 13:09, 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@xxxxxxxxxx>
> ---
> 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;
> +}
I think you need an INIT_LIST_HEAD() in here as well, or
CONFIG_DEBUG_LIST might get unhappy about using an uninitialised head later.
Robin.
> +
> /* 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;
>
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