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    Subject[PATCH 07/39] lmb: Add lmb_find_area()
    Date
    It will try find area according with size/align in specified range (start, end).

    lmb_find_area() will honor goal/limit.

    also make it more easy for x86 to use lmb.
    x86 early_res is using find/reserve pattern instead of alloc.

    When we need temporaray buff for range array etc for range work, if We are using
    lmb_alloc(), We will need to add some post fix code for buffer that is used
    by range array, because it is in the lmb.reserved already. and have to call
    extra lmb_free().

    -v2: Change name to lmb_find_area() according to Michael Ellerman
    -v3: Add generic weak version __lmb_find_area()

    Signed-off-by: Yinghai Lu <yinghai@kernel.org>
    ---
    include/linux/lmb.h | 4 ++++
    mm/lmb.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
    2 files changed, 53 insertions(+), 0 deletions(-)

    diff --git a/include/linux/lmb.h b/include/linux/lmb.h
    index e14ea8d..4cf2f3b 100644
    --- a/include/linux/lmb.h
    +++ b/include/linux/lmb.h
    @@ -83,6 +83,10 @@ lmb_end_pfn(struct lmb_region *type, unsigned long region_nr)
    lmb_size_pages(type, region_nr);
    }

    +u64 __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
    + u64 size, u64 align);
    +u64 lmb_find_area(u64 start, u64 end, u64 size, u64 align);
    +
    #include <asm/lmb.h>

    #endif /* __KERNEL__ */
    diff --git a/mm/lmb.c b/mm/lmb.c
    index 392d805..7010212 100644
    --- a/mm/lmb.c
    +++ b/mm/lmb.c
    @@ -11,9 +11,13 @@
    */

    #include <linux/kernel.h>
    +#include <linux/types.h>
    #include <linux/init.h>
    #include <linux/bitops.h>
    #include <linux/lmb.h>
    +#include <linux/bootmem.h>
    +#include <linux/mm.h>
    +#include <linux/range.h>

    #define LMB_ALLOC_ANYWHERE 0

    @@ -559,3 +563,48 @@ int lmb_find(struct lmb_property *res)
    }
    return -1;
    }
    +
    +u64 __init __weak __lmb_find_area(u64 ei_start, u64 ei_last, u64 start, u64 end,
    + u64 size, u64 align)
    +{
    + u64 final_start, final_end;
    + u64 mem;
    +
    + final_start = max(ei_start, start);
    + final_end = min(ei_last, end);
    +
    + if (final_start >= final_end)
    + return -1ULL;
    +
    + mem = __lmb_find_base(size, align, final_end);
    +
    + if (mem == -1ULL)
    + return -1ULL;
    +
    + lmb_free(mem, size);
    + if (mem >= final_start)
    + return mem;
    +
    + return -1ULL;
    +}
    +
    +/*
    + * Find a free area with specified alignment in a specific range.
    + */
    +u64 __init __weak lmb_find_area(u64 start, u64 end, u64 size, u64 align)
    +{
    + int i;
    +
    + for (i = lmb.memory.cnt - 1; i >= 0; i--) {
    + u64 ei_start = lmb.memory.region[i].base;
    + u64 ei_last = ei_start + lmb.memory.region[i].size;
    + u64 addr;
    +
    + addr = __lmb_find_area(ei_start, ei_last, start, end,
    + size, align);
    +
    + if (addr != -1ULL)
    + return addr;
    + }
    + return -1ULL;
    +}
    --
    1.6.4.2


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