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,
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
The file layout is inspired of /sys/bus/pci/devices/BDF/resource.
I also read Documentation/filesystems/sysfs.txt so I expect this
to be frowned upon.
---
drivers/iommu/iommu.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index e0fbcc5..ce9a465 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -32,6 +32,7 @@
#include <linux/pci.h>
#include <linux/bitops.h>
#include <linux/property.h>
+#include <linux/list_sort.h>
#include <trace/events/iommu.h>
static struct kset *iommu_group_kset;
@@ -186,8 +187,47 @@ int iommu_get_group_resv_regions(struct iommu_group *group,
}
EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);
+static int iommu_resv_region_cmp(void *priv, struct list_head *a,
+ struct list_head *b)
+{
+ struct iommu_resv_region *rega, *regb;
+
+ rega = container_of(a, struct iommu_resv_region, list);
+ regb = container_of(b, struct iommu_resv_region, list);
+
+ if (rega->start + rega->length - 1 < regb->start)
+ return -1;
+ if (regb->start + regb->length - 1 < rega->start)
+ return 1;
+ else
+ return 0;
+}
+
+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_sort(NULL, &group_resv_regions, iommu_resv_region_cmp);
+
+ list_for_each_entry_safe(region, next, &group_resv_regions, list) {
+ str += sprintf(str, "0x%016llx 0x%016llx\n", region->start,
+ region->start + region->length - 1);
+ kfree(region);
+ }
+
+ return (str - buf);
+}
+
static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
+static IOMMU_GROUP_ATTR(reserved_regions, S_IRUGO,
+ iommu_group_show_resv_regions, NULL);
+
static void iommu_group_release(struct kobject *kobj)
{
struct iommu_group *group = to_iommu_group(kobj);
@@ -202,6 +242,8 @@ static void iommu_group_release(struct kobject *kobj)
if (group->default_domain)
iommu_domain_free(group->default_domain);
+ iommu_group_remove_file(group, &iommu_group_attr_reserved_regions);
+
kfree(group->name);
kfree(group);
}
@@ -265,6 +307,11 @@ 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;
--
1.9.1
--
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