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>
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@ -12,3 +12,15 @@ Description: /sys/kernel/iommu_groups/ contains a number of sub-
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file if the IOMMU driver has chosen to register a more
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common name for the group.
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Users:
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What: /sys/kernel/iommu_groups/reserved_regions
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Date: January 2017
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KernelVersion: v4.11
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Contact: Eric Auger <eric.auger@redhat.com>
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Description: /sys/kernel/iommu_groups/reserved_regions list IOVA
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regions that are reserved. Not necessarily all
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reserved regions are listed. This is typically used to
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output direct-mapped, MSI, non mappable regions. Each
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region is described on a single line: the 1st field is
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the base IOVA, the second is the end IOVA and the third
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field describes the type of the region.
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@ -68,6 +68,12 @@ struct iommu_group_attribute {
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const char *buf, size_t count);
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};
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static const char * const iommu_group_resv_type_string[] = {
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[IOMMU_RESV_DIRECT] = "direct",
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[IOMMU_RESV_RESERVED] = "reserved",
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[IOMMU_RESV_MSI] = "msi",
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};
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#define IOMMU_GROUP_ATTR(_name, _mode, _show, _store) \
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struct iommu_group_attribute iommu_group_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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@ -231,8 +237,33 @@ int iommu_get_group_resv_regions(struct iommu_group *group,
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}
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EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);
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static ssize_t iommu_group_show_resv_regions(struct iommu_group *group,
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char *buf)
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{
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struct iommu_resv_region *region, *next;
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struct list_head group_resv_regions;
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char *str = buf;
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INIT_LIST_HEAD(&group_resv_regions);
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iommu_get_group_resv_regions(group, &group_resv_regions);
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list_for_each_entry_safe(region, next, &group_resv_regions, list) {
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str += sprintf(str, "0x%016llx 0x%016llx %s\n",
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(long long int)region->start,
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(long long int)(region->start +
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region->length - 1),
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iommu_group_resv_type_string[region->type]);
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kfree(region);
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}
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return (str - buf);
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}
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static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);
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static IOMMU_GROUP_ATTR(reserved_regions, 0444,
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iommu_group_show_resv_regions, NULL);
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static void iommu_group_release(struct kobject *kobj)
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{
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struct iommu_group *group = to_iommu_group(kobj);
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@ -310,6 +341,11 @@ struct iommu_group *iommu_group_alloc(void)
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*/
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kobject_put(&group->kobj);
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ret = iommu_group_create_file(group,
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&iommu_group_attr_reserved_regions);
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if (ret)
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return ERR_PTR(ret);
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pr_debug("Allocated group %d\n", group->id);
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return group;
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