[PATCH 3/5] iommu/virtio: Sort reserved regions
From: Jean-Philippe Brucker <hidden>
Date: 2021-10-13 12:18:31
Also in:
linux-iommu
Subsystem:
iommu subsystem, the rest, virtio iommu driver · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds, Jean-Philippe Brucker
To ease identity mapping support, keep the list of reserved regions sorted. Signed-off-by: Jean-Philippe Brucker <redacted> --- 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(®ion->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(®ion->list, &next->list); return 0; }
--
2.33.0
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