evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

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.

Change-Id: Iab55341a8526084a5110dc5a2d4448fd46e3296a
Signed-off-by: Joerg Roedel <jroedel@suse.de>
[pdaly@codeaurora.org Resolve minor conflicts]
This commit is contained in:
Joerg Roedel 2015-05-28 18:41:33 +02:00 • committed by David Keitel
parent 2944c708c9
commit ef3a0f2227
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

@ -1570,3 +1570,19 @@ int iommu_dma_supported(struct iommu_domain *domain, struct device *dev,
return domain->ops->dma_supported(domain, dev, mask);
return 0;
}
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

@ -131,6 +131,20 @@ enum iommu_attr {
extern struct dentry *iommu_debugfs_top;
/**
* 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
/**
@ -182,6 +196,10 @@ 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);
@ -245,6 +263,9 @@ extern unsigned long iommu_reg_read(struct iommu_domain *domain,
extern void iommu_reg_write(struct iommu_domain *domain, unsigned long offset,
unsigned long val);
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,
@ -454,6 +475,16 @@ static inline void iommu_reg_write(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)
{