Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-25 05:32:00 +00:00
Code Issues Packages Projects Releases Wiki Activity

iommu: Introduce direct mapped region handling

Browse Source 
Add two new functions to the IOMMU-API to allow the IOMMU
drivers to export the requirements for direct mapped regions
per device.
This is useful for exporting the information in Intel VT-d's
RMRR entries or AMD-Vi's unity mappings.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-05-28 18:41:33 +02:00
parent 2c1296d92a
commit a1015c2b99
2 changed files with 47 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/iommu/iommu.c
View File

@ -1469,3 +1469,19 @@ int iommu_domain_set_attr(struct iommu_domain *domain,
return ret;
}
EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
void iommu_get_dm_regions(struct device *dev, struct list_head *list)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (ops && ops->get_dm_regions)
ops->get_dm_regions(dev, list);
}
void iommu_put_dm_regions(struct device *dev, struct list_head *list)
{
const struct iommu_ops *ops = dev->bus->iommu_ops;
if (ops && ops->put_dm_regions)
ops->put_dm_regions(dev, list);
}

31
include/linux/iommu.h
View File

@ -114,6 +114,20 @@ enum iommu_attr {
DOMAIN_ATTR_MAX,
};
/**
* struct iommu_dm_region - descriptor for a direct mapped memory region
* @list: Linked list pointers
* @start: System physical start address of the region
* @length: Length of the region in bytes
* @prot: IOMMU Protection flags (READ/WRITE/...)
*/
struct iommu_dm_region {
struct list_head list;
phys_addr_t start;
size_t length;
int prot;
};
#ifdef CONFIG_IOMMU_API
/**
@ -159,6 +173,10 @@ struct iommu_ops {
int (*domain_set_attr)(struct iommu_domain *domain,
enum iommu_attr attr, void *data);
/* Request/Free a list of direct mapping requirements for a device */
void (*get_dm_regions)(struct device *dev, struct list_head *list);
void (*put_dm_regions)(struct device *dev, struct list_head *list);
/* Window handling functions */
int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
phys_addr_t paddr, u64 size, int prot);
@ -205,6 +223,9 @@ extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, dma_addr_t io
extern void iommu_set_fault_handler(struct iommu_domain *domain,
iommu_fault_handler_t handler, void *token);
extern void iommu_get_dm_regions(struct device *dev, struct list_head *list);
extern void iommu_put_dm_regions(struct device *dev, struct list_head *list);
extern int iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group);
extern void iommu_detach_group(struct iommu_domain *domain,
@ -379,6 +400,16 @@ static inline void iommu_set_fault_handler(struct iommu_domain *domain,
{
}
static inline void iommu_get_dm_regions(struct device *dev,
struct list_head *list)
{
}
static inline void iommu_put_dm_regions(struct device *dev,
struct list_head *list)
{
}
static inline int iommu_attach_group(struct iommu_domain *domain,
struct iommu_group *group)
{