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Subject[PATCH v2 3/5] iommu/virtio: Sort reserved regions
Date
To ease identity mapping support, keep the list of reserved regions
sorted.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
drivers/iommu/virtio-iommu.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index ee8a7afd667b..d63ec4d11b00 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -423,7 +423,7 @@ static int viommu_add_resv_mem(struct viommu_endpoint *vdev,
size_t size;
u64 start64, end64;
phys_addr_t start, end;
- struct iommu_resv_region *region = NULL;
+ struct iommu_resv_region *region = NULL, *next;
unsigned long prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;

start = start64 = le64_to_cpu(mem->start);
@@ -454,7 +454,12 @@ static int viommu_add_resv_mem(struct viommu_endpoint *vdev,
if (!region)
return -ENOMEM;

- list_add(&region->list, &vdev->resv_regions);
+ /* Keep the list sorted */
+ list_for_each_entry(next, &vdev->resv_regions, list) {
+ if (next->start > region->start)
+ break;
+ }
+ list_add_tail(&region->list, &next->list);
return 0;
}

--
2.33.1
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