iommu: Implement reserved_regions iommu-group sysfs file

[karo-tx-linux.git] / drivers / iommu / iommu.c

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 640056ba46c2402d703f67d947adc14e4f9863e0..f4a176e56e3914ec22724e02b9f0262aa1c22f9b 100644 (file)
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -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;