From: Joerg Roedel <[email protected]> This allows to handle domains differently based on their type in the future. An IOMMU driver can implement certain optimizations for DMA-API domains for example.
Signed-off-by: Joerg Roedel <[email protected]> --- drivers/iommu/iommu.c | 5 +++-- include/linux/iommu.h | 11 ++++++++++- 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 684efc0..ab24d77 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -909,14 +909,15 @@ struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) ops = bus->iommu_ops; if (ops->domain_alloc) - domain = ops->domain_alloc(); + domain = ops->domain_alloc(IOMMU_DOMAIN_UNMANAGED); else domain = kzalloc(sizeof(*domain), GFP_KERNEL); if (!domain) return NULL; - domain->ops = bus->iommu_ops; + domain->ops = bus->iommu_ops; + domain->type = IOMMU_DOMAIN_UNMANAGED; if (ops->domain_init && domain->ops->domain_init(domain)) goto out_free; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 69d1d12..0b67f65 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -51,7 +51,16 @@ struct iommu_domain_geometry { bool force_aperture; /* DMA only allowed in mappable range? */ }; +/* This are the possible domain-types */ +enum iommu_domain_type { + IOMMU_DOMAIN_DMA, /* Domain used for DMA-API */ + IOMMU_DOMAIN_IDENTITY, /* Identity mapped domain */ + IOMMU_DOMAIN_UNMANAGED, /* Domain mappings are managed by a third party + user (like KVM or VFIO) */ +}; + struct iommu_domain { + enum iommu_domain_type type; const struct iommu_ops *ops; void *priv; iommu_fault_handler_t handler; @@ -117,7 +126,7 @@ struct iommu_ops { void (*domain_destroy)(struct iommu_domain *domain); /* Domain allocation and freeing by the iommu driver */ - struct iommu_domain *(*domain_alloc)(void); + struct iommu_domain *(*domain_alloc)(enum iommu_domain_type); void (*domain_free)(struct iommu_domain *); int (*attach_dev)(struct iommu_domain *domain, struct device *dev); -- 1.8.4.5 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
