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[PATCH v2 06/12] range: Introduce range_inverse_array()
From: |
Eric Auger |
Subject: |
[PATCH v2 06/12] range: Introduce range_inverse_array() |
Date: |
Wed, 13 Sep 2023 10:01:41 +0200 |
This helper reverses an array of regions, turning original
regions into holes and original holes into actual regions,
covering the whole UINT64_MAX span.
Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
v1 -> v2:
- Move range_inverse_array description comment in the header
- Take low/high params
---
include/qemu/range.h | 8 ++++++++
util/range.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 53 insertions(+)
diff --git a/include/qemu/range.h b/include/qemu/range.h
index 7e2b1cc447..2b59e3bf0c 100644
--- a/include/qemu/range.h
+++ b/include/qemu/range.h
@@ -219,4 +219,12 @@ static inline int ranges_overlap(uint64_t first1, uint64_t
len1,
GList *range_list_insert(GList *list, Range *data);
+/*
+ * Inverse an array of sorted ranges over the [low, high] span, ie.
+ * original ranges becomes holes in the newly allocated inv_ranges
+ */
+void range_inverse_array(uint32_t nr_ranges, Range *ranges,
+ uint32_t *nr_inv_ranges, Range **inv_ranges,
+ uint64_t low, uint64_t high);
+
#endif
diff --git a/util/range.c b/util/range.c
index 098d9d2dc0..4baeb588cc 100644
--- a/util/range.c
+++ b/util/range.c
@@ -70,3 +70,48 @@ GList *range_list_insert(GList *list, Range *data)
return list;
}
+
+void range_inverse_array(uint32_t nr_ranges, Range *ranges,
+ uint32_t *nr_inv_ranges, Range **inv_ranges,
+ uint64_t low, uint64_t high)
+{
+ Range *resv;
+ int i = 0, j = 0;
+
+ resv = g_malloc0_n(nr_ranges + 1, sizeof(Range));
+
+ for (; j < nr_ranges && (range_upb(&ranges[j]) < low); j++) {
+ continue; /* skip all ranges below mon */
+ }
+
+ if (j == nr_ranges) {
+ range_set_bounds(&resv[i++], low, high);
+ goto realloc;
+ }
+
+ /* first range lob is greater than min, insert a first range */
+ if (range_lob(&ranges[j]) > low) {
+ range_set_bounds(&resv[i++], low,
+ MIN(range_lob(&ranges[j]) - 1, high));
+ }
+
+ /* insert a range inbetween each original range until we reach max */
+ for (; j < nr_ranges - 1; j++) {
+ if (range_lob(&ranges[j]) >= high) {
+ goto realloc;
+ }
+ if (range_compare(&ranges[j], &ranges[j + 1])) {
+ range_set_bounds(&resv[i++], range_upb(&ranges[j]) + 1,
+ MIN(range_lob(&ranges[j + 1]) - 1, high));
+ }
+ }
+ /* last range upb is less than max, insert a last range */
+ if (range_upb(&ranges[j]) < high) {
+ range_set_bounds(&resv[i++],
+ range_upb(&ranges[j]) + 1, high);
+ }
+realloc:
+ *nr_inv_ranges = i;
+ resv = g_realloc(resv, i * sizeof(Range));
+ *inv_ranges = resv;
+}
--
2.41.0
- [PATCH v2 03/12] vfio: Collect container iova range info, (continued)
- [PATCH v2 03/12] vfio: Collect container iova range info, Eric Auger, 2023/09/13
- [PATCH v2 04/12] virtio-iommu: Rename reserved_regions into prop_resv_regions, Eric Auger, 2023/09/13
- [PATCH v2 05/12] virtio-iommu: Introduce per IOMMUDevice reserved regions, Eric Auger, 2023/09/13
- [PATCH v2 06/12] range: Introduce range_inverse_array(),
Eric Auger <=
- [PATCH v2 07/12] virtio-iommu: Implement set_iova_ranges() callback, Eric Auger, 2023/09/13
- [PATCH v2 08/12] range: Make range_compare() public, Eric Auger, 2023/09/13
- [PATCH v2 09/12] util/reserved-region: Add new ReservedRegion helpers, Eric Auger, 2023/09/13
- [PATCH v2 10/12] virtio-iommu: Consolidate host reserved regions and property set ones, Eric Auger, 2023/09/13
- [PATCH v2 11/12] test: Add some tests for range and resv-mem helpers, Eric Auger, 2023/09/13
- [PATCH v2 12/12] vfio: Remove 64-bit IOVA address space assumption, Eric Auger, 2023/09/13