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iommu: Add DOMAIN_ATTR_WINDOWS domain attribute 

This attribute can be used to set and get the number of
subwindows on IOMMUs that are window-based.

Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Joerg Roedel 2013-02-04 14:00:01 +01:00
parent d7787d579c
commit 693567125b
2 changed files with 35 additions and 3 deletions
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31
drivers/iommu/iommu.c
View File

@ -891,6 +891,7 @@ int iommu_domain_get_attr(struct iommu_domain *domain,
struct iommu_domain_geometry *geometry;
bool *paging;
int ret = 0;
u32 *count;
switch (attr) {
case DOMAIN_ATTR_GEOMETRY:
@ -901,6 +902,15 @@ int iommu_domain_get_attr(struct iommu_domain *domain,
case DOMAIN_ATTR_PAGING:
paging = data;
*paging = (domain->ops->pgsize_bitmap != 0UL);
break;
case DOMAIN_ATTR_WINDOWS:
count = data;
if (domain->ops->domain_get_windows != NULL)
*count = domain->ops->domain_get_windows(domain);
else
ret = -ENODEV;
break;
default:
if (!domain->ops->domain_get_attr)
@ -916,9 +926,26 @@ EXPORT_SYMBOL_GPL(iommu_domain_get_attr);
int iommu_domain_set_attr(struct iommu_domain *domain,
enum iommu_attr attr, void *data)
{
if (!domain->ops->domain_set_attr)
int ret = 0;
u32 *count;
switch (attr) {
case DOMAIN_ATTR_WINDOWS:
count = data;
if (domain->ops->domain_set_windows != NULL)
ret = domain->ops->domain_set_windows(domain, *count);
else
ret = -ENODEV;
break;
default:
if (domain->ops->domain_set_attr == NULL)
return -EINVAL;
return domain->ops->domain_set_attr(domain, attr, data);
ret = domain->ops->domain_set_attr(domain, attr, data);
}
return ret;
}
EXPORT_SYMBOL_GPL(iommu_domain_set_attr);

5
include/linux/iommu.h
View File

@ -60,6 +60,7 @@ struct iommu_domain {
enum iommu_attr {
DOMAIN_ATTR_GEOMETRY,
DOMAIN_ATTR_PAGING,
DOMAIN_ATTR_WINDOWS,
DOMAIN_ATTR_MAX,
};
@ -106,6 +107,10 @@ struct iommu_ops {
int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
phys_addr_t paddr, u64 size);
void (*domain_window_disable)(struct iommu_domain *domain, u32 wnd_nr);
/* Set the numer of window per domain */
int (*domain_set_windows)(struct iommu_domain *domain, u32 w_count);
/* Get the numer of window per domain */
u32 (*domain_get_windows)(struct iommu_domain *domain);
unsigned long pgsize_bitmap;
};