iommu: iommu_get_group_resv_regions (6c65fb31) · Commits · 戴 / test

drivers/iommu/iommu.c

+98 −0

Original line number	Diff line number	Diff line
		@@ -133,6 +133,104 @@ static ssize_t iommu_group_show_name(struct iommu_group group, char buf)
		return sprintf(buf, "%s\n", group->name);
		}

		/**
		* iommu_insert_resv_region - Insert a new region in the
		* list of reserved regions.
		* @new: new region to insert
		* @regions: list of regions
		*
		* The new element is sorted by address with respect to the other
		* regions of the same type. In case it overlaps with another
		* region of the same type, regions are merged. In case it
		* overlaps with another region of different type, regions are
		* not merged.
		*/
		static int iommu_insert_resv_region(struct iommu_resv_region *new,
		struct list_head *regions)
		{
		struct iommu_resv_region *region;
		phys_addr_t start = new->start;
		phys_addr_t end = new->start + new->length - 1;
		struct list_head *pos = regions->next;

		while (pos != regions) {
		struct iommu_resv_region *entry =
		list_entry(pos, struct iommu_resv_region, list);
		phys_addr_t a = entry->start;
		phys_addr_t b = entry->start + entry->length - 1;
		int type = entry->type;

		if (end < a) {
		goto insert;
		} else if (start > b) {
		pos = pos->next;
		} else if ((start >= a) && (end <= b)) {
		if (new->type == type)
		goto done;
		else
		pos = pos->next;
		} else {
		if (new->type == type) {
		phys_addr_t new_start = min(a, start);
		phys_addr_t new_end = max(b, end);

		list_del(&entry->list);
		entry->start = new_start;
		entry->length = new_end - new_start + 1;
		iommu_insert_resv_region(entry, regions);
		} else {
		pos = pos->next;
		}
		}
		}
		insert:
		region = iommu_alloc_resv_region(new->start, new->length,
		new->prot, new->type);
		if (!region)
		return -ENOMEM;

		list_add_tail(&region->list, pos);
		done:
		return 0;
		}

		static int
		iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
		struct list_head *group_resv_regions)
		{
		struct iommu_resv_region *entry;
		int ret;

		list_for_each_entry(entry, dev_resv_regions, list) {
		ret = iommu_insert_resv_region(entry, group_resv_regions);
		if (ret)
		break;
		}
		return ret;
		}

		int iommu_get_group_resv_regions(struct iommu_group *group,
		struct list_head *head)
		{
		struct iommu_device *device;
		int ret = 0;

		mutex_lock(&group->mutex);
		list_for_each_entry(device, &group->devices, list) {
		struct list_head dev_resv_regions;

		INIT_LIST_HEAD(&dev_resv_regions);
		iommu_get_resv_regions(device->dev, &dev_resv_regions);
		ret = iommu_insert_device_resv_regions(&dev_resv_regions, head);
		iommu_put_resv_regions(device->dev, &dev_resv_regions);
		if (ret)
		break;
		}
		mutex_unlock(&group->mutex);
		return ret;
		}
		EXPORT_SYMBOL_GPL(iommu_get_group_resv_regions);

		static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL);

		static void iommu_group_release(struct kobject *kobj)

include/linux/iommu.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -246,6 +246,8 @@ extern void iommu_put_resv_regions(struct device dev, struct list_head list);
		extern int iommu_request_dm_for_dev(struct device *dev);
		extern struct iommu_resv_region *
		iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, int type);
		extern int iommu_get_group_resv_regions(struct iommu_group *group,
		struct list_head *head);

		extern int iommu_attach_group(struct iommu_domain *domain,
		struct iommu_group *group);
		@@ -463,6 +465,12 @@ static inline void iommu_put_resv_regions(struct device *dev,
		{
		}

		static inline int iommu_get_group_resv_regions(struct iommu_group *group,
		struct list_head *head)
		{
		return -ENODEV;
		}

		static inline int iommu_request_dm_for_dev(struct device *dev)
		{
		return -ENODEV;

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