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iommu: Add sysfs attribyte for domain type 

While we could print it at setup time, this is an easier way to match
each device to their default IOMMU allocation type.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Olof Johansson 2018-07-11 13:59:36 -07:00 committed by Joerg Roedel
parent 7d0f5fd3e4
commit c52c72d3de
1 changed files with 32 additions and 0 deletions
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32
drivers/iommu/iommu.c
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@ -294,11 +294,39 @@ static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
return (str - buf);
}
static ssize_t iommu_group_show_type(struct iommu_group *group,
char *buf)
{
char *type = "unknown\n";
if (group->default_domain) {
switch (group->default_domain->type) {
case IOMMU_DOMAIN_BLOCKED:
type = "blocked\n";
break;
case IOMMU_DOMAIN_IDENTITY:
type = "identity\n";
break;
case IOMMU_DOMAIN_UNMANAGED:
type = "unmanaged\n";
break;
case IOMMU_DOMAIN_DMA:
type = "DMA";
break;
}
}
strcpy(buf, type);
return strlen(type);
}
static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
static IOMMU_GROUP_ATTR(reserved_regions, 0444,
iommu_group_show_resv_regions, NULL);
static IOMMU_GROUP_ATTR(type, 0444, iommu_group_show_type, NULL);
static void iommu_group_release(struct kobject *kobj)
{
struct iommu_group *group = to_iommu_group(kobj);
@ -380,6 +408,10 @@ struct iommu_group *iommu_group_alloc(void)
if (ret)
return ERR_PTR(ret);
ret = iommu_group_create_file(group, &iommu_group_attr_type);
if (ret)
return ERR_PTR(ret);
pr_debug("Allocated group %d\n", group->id);
return group;