[PATCH 02/15] iommu: Introduce iommu domain types
From: joro@8bytes.org (Joerg Roedel)
Date: 2015-01-26 23:52:00
Also in:
linux-iommu, linux-samsung-soc, linux-tegra, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
From: Joerg Roedel <redacted> 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 <redacted> --- 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