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iommu: Implement reserved_regions iommu-group sysfs file 

A new iommu-group sysfs attribute file is introduced. It contains
the list of reserved regions for the iommu-group. Each reserved
region is described on a separate line:
- first field is the start IOVA address,
- second is the end IOVA address,
- third is the type.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Tomasz Nowicki <tomasz.nowicki@caviumnetworks.com>
Tested-by: Bharat Bhushan <bharat.bhushan@nxp.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Eric Auger 2017-01-19 20:57:52 +00:00 committed by Will Deacon
parent 6c65fb318e
commit bc7d12b91b
2 changed files with 48 additions and 0 deletions
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12
Documentation/ABI/testing/sysfs-kernel-iommu_groups
View File

@ -12,3 +12,15 @@ Description: /sys/kernel/iommu_groups/ contains a number of sub-
file if the IOMMU driver has chosen to register a more
common name for the group.
Users:
What: /sys/kernel/iommu_groups/reserved_regions
Date: January 2017
KernelVersion: v4.11
Contact: Eric Auger <eric.auger@redhat.com>
Description: /sys/kernel/iommu_groups/reserved_regions list IOVA
regions that are reserved. Not necessarily all
reserved regions are listed. This is typically used to
output direct-mapped, MSI, non mappable regions. Each
region is described on a single line: the 1st field is
the base IOVA, the second is the end IOVA and the third
field describes the type of the region.

36
drivers/iommu/iommu.c
View File

@ -68,6 +68,12 @@ struct iommu_group_attribute {
const char *buf, size_t count);
};
static const char * const iommu_group_resv_type_string[] = {
[IOMMU_RESV_DIRECT] = "direct",
[IOMMU_RESV_RESERVED] = "reserved",
[IOMMU_RESV_MSI] = "msi",
};
#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
struct iommu_group_attribute iommu_group_attr_##_name = \
__ATTR(_name, _mode, _show, _store)
@ -231,8 +237,33 @@ int iommu_get_group_resv_regions(struct iommu_group *group,
}
EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);
static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
char *buf)
{
struct iommu_resv_region *region, *next;
struct list_head group_resv_regions;
char *str = buf;
INIT_LIST_HEAD(&group_resv_regions);
iommu_get_group_resv_regions(group, &group_resv_regions);
list_for_each_entry_safe(region, next, &group_resv_regions, list) {
str += sprintf(str, "0x%016llx 0x%016llx %s\n",
(long long int)region->start,
(long long int)(region->start +
region->length - 1),
iommu_group_resv_type_string[region->type]);
kfree(region);
}
return (str - buf);
}
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 void iommu_group_release(struct kobject *kobj)
{
struct iommu_group *group = to_iommu_group(kobj);
@ -310,6 +341,11 @@ struct iommu_group *iommu_group_alloc(void)
*/
kobject_put(&group->kobj);
ret = iommu_group_create_file(group,
&iommu_group_attr_reserved_regions);
if (ret)
return ERR_PTR(ret);
pr_debug("Allocated group %d\n", group->id);
return group;