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iommu: Introduce iommu domain types 

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.

The domain types can be extended later and some of the
existing domain attributes can be migrated to become domain
flags.

Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-03-26 13:43:05 +01:00
parent 938c470976
commit 8539c7c16b
2 changed files with 29 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/iommu/iommu.c
View File

@ -909,14 +909,15 @@ struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
ops = bus->iommu_ops; ops = bus->iommu_ops;
if (ops->domain_alloc) if (ops->domain_alloc)
domain = ops->domain_alloc(); domain = ops->domain_alloc(IOMMU_DOMAIN_UNMANAGED);
else else
domain = kzalloc(sizeof(*domain), GFP_KERNEL); domain = kzalloc(sizeof(*domain), GFP_KERNEL);
if (!domain) if (!domain)
return NULL; 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)) if (ops->domain_init && domain->ops->domain_init(domain))
goto out_free; goto out_free;

27
include/linux/iommu.h
View File

@ -51,7 +51,32 @@ struct iommu_domain_geometry {
bool force_aperture; /* DMA only allowed in mappable range? */ bool force_aperture; /* DMA only allowed in mappable range? */
}; };
/* Domain feature flags */
#define __IOMMU_DOMAIN_PAGING (1U << 0) /* Support for iommu_map/unmap */
#define __IOMMU_DOMAIN_DMA_API (1U << 1) /* Domain for use in DMA-API
implementation */
#define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity mapped */
/*
* This are the possible domain-types
*
* IOMMU_DOMAIN_BLOCKED - All DMA is blocked, can be used to isolate
* devices
* IOMMU_DOMAIN_IDENTITY - DMA addresses are system physical addresses
* IOMMU_DOMAIN_UNMANAGED - DMA mappings managed by IOMMU-API user, used
* for VMs
* IOMMU_DOMAIN_DMA - Internally used for DMA-API implementations.
* This flag allows IOMMU drivers to implement
* certain optimizations for these domains
*/
#define IOMMU_DOMAIN_BLOCKED (0U)
#define IOMMU_DOMAIN_IDENTITY (__IOMMU_DOMAIN_PT)
#define IOMMU_DOMAIN_UNMANAGED (__IOMMU_DOMAIN_PAGING)
#define IOMMU_DOMAIN_DMA (__IOMMU_DOMAIN_PAGING | \
__IOMMU_DOMAIN_DMA_API)
struct iommu_domain { struct iommu_domain {
unsigned type;
const struct iommu_ops *ops; const struct iommu_ops *ops;
void *priv; void *priv;
iommu_fault_handler_t handler; iommu_fault_handler_t handler;
@ -117,7 +142,7 @@ struct iommu_ops {
void (*domain_destroy)(struct iommu_domain *domain); void (*domain_destroy)(struct iommu_domain *domain);
/* Domain allocation and freeing by the iommu driver */ /* Domain allocation and freeing by the iommu driver */
struct iommu_domain *(*domain_alloc)(void); struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
void (*domain_free)(struct iommu_domain *); void (*domain_free)(struct iommu_domain *);
int (*attach_dev)(struct iommu_domain *domain, struct device *dev); int (*attach_dev)(struct iommu_domain *domain, struct device *dev);