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From cf977b1af9ec67fabcc6a625589c49c52d07b11d Mon Sep 17 00:00:00 2001
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From: AKASHI Takahiro <takahiro.akashi@linaro.org>
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Date: Wed, 18 Dec 2019 11:42:30 -0500
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Subject: [PATCH 1/3] kexec: add variant helper functions for handling memory
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regions
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mem_regions_alloc_and_add() and mem_regions_alloc_and_exclude() are
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functionally equivalent to, respectively, mem_regions_add() and
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mem_regions_exclude() except the formers will re-allocate memory
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dynamically when no more entries are available in 'ranges' array.
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Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
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Tested-by: Bhupesh Sharma <bhsharma@redhat.com>
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Tested-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
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Signed-off-by: Simon Horman <horms@verge.net.au>
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---
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kexec/mem_regions.c | 42 ++++++++++++++++++++++++++++++++++++++++++
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kexec/mem_regions.h | 7 +++++++
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2 files changed, 49 insertions(+)
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diff --git a/kexec/mem_regions.c b/kexec/mem_regions.c
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index 50c8abccb93a..ad7d3f13fd84 100644
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--- a/kexec/mem_regions.c
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+++ b/kexec/mem_regions.c
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@@ -125,3 +125,45 @@ int mem_regions_exclude(struct memory_ranges *ranges,
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}
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return 0;
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}
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+
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+#define KEXEC_MEMORY_RANGES 16
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+
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+int mem_regions_alloc_and_add(struct memory_ranges *ranges,
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+ unsigned long long base,
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+ unsigned long long length, int type)
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+{
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+ void *new_ranges;
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+
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+ if (ranges->size >= ranges->max_size) {
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+ new_ranges = realloc(ranges->ranges,
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+ sizeof(struct memory_range) *
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+ (ranges->max_size + KEXEC_MEMORY_RANGES));
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+ if (!new_ranges)
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+ return -1;
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+
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+ ranges->ranges = new_ranges;
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+ ranges->max_size += KEXEC_MEMORY_RANGES;
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+ }
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+
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+ return mem_regions_add(ranges, base, length, type);
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+}
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+
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+int mem_regions_alloc_and_exclude(struct memory_ranges *ranges,
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+ const struct memory_range *range)
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+{
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+ void *new_ranges;
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+
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+ /* for safety, we should have at least one free entry in ranges */
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+ if (ranges->size >= ranges->max_size) {
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+ new_ranges = realloc(ranges->ranges,
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+ sizeof(struct memory_range) *
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+ (ranges->max_size + KEXEC_MEMORY_RANGES));
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+ if (!new_ranges)
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+ return -1;
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+
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+ ranges->ranges = new_ranges;
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+ ranges->max_size += KEXEC_MEMORY_RANGES;
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+ }
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+
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+ return mem_regions_exclude(ranges, range);
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+}
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diff --git a/kexec/mem_regions.h b/kexec/mem_regions.h
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index ae9e972b0206..e306d67e3261 100644
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--- a/kexec/mem_regions.h
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+++ b/kexec/mem_regions.h
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@@ -12,4 +12,11 @@ int mem_regions_exclude(struct memory_ranges *ranges,
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int mem_regions_add(struct memory_ranges *ranges, unsigned long long base,
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unsigned long long length, int type);
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+int mem_regions_alloc_and_exclude(struct memory_ranges *ranges,
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+ const struct memory_range *range);
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+
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+int mem_regions_alloc_and_add(struct memory_ranges *ranges,
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+ unsigned long long base,
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+ unsigned long long length, int type);
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+
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#endif
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--
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2.7.4
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