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Subject[PATCH 04/35] lmb: Add lmb_find_area()
Date
it is a wrapper for lmb_find_base

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

-v2: Change name to lmb_find_area() according to Michael Ellerman
-v3: Add generic weak version __lmb_find_area()
so keep the path for fallback to x86 version that handle from low

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
include/linux/lmb.h | 4 ++++
lib/lmb.c | 27 ++++++++++++++++++++++++++-
2 files changed, 30 insertions(+), 1 deletions(-)

diff --git a/include/linux/lmb.h b/include/linux/lmb.h
index 0b073a3..3c23dc8 100644
--- a/include/linux/lmb.h
+++ b/include/linux/lmb.h
@@ -44,6 +44,10 @@ extern struct lmb lmb;
extern int lmb_debug;
extern struct lmb_region lmb_reserved_init_regions[];

+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);
+
extern void __init lmb_init(void);
extern void __init lmb_analyze(void);
extern long lmb_add(phys_addr_t base, phys_addr_t size);
diff --git a/lib/lmb.c b/lib/lmb.c
index 6d49a17..f917dbf 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -155,6 +155,31 @@ static phys_addr_t __init lmb_find_base(phys_addr_t size, phys_addr_t align,
return LMB_ERROR;
}

+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 LMB_ERROR;
+
+ mem = lmb_find_base(size, align, final_start, final_end);
+
+ return mem;
+}
+
+/*
+ * 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)
+{
+ return lmb_find_base(size, align, start, end);
+}
+
static void __init_lmb lmb_remove_region(struct lmb_type *type, unsigned long r)
{
unsigned long i;
@@ -199,7 +224,7 @@ static int __init_lmb lmb_double_array(struct lmb_type *type)
new_array = kmalloc(new_size, GFP_KERNEL);
addr = new_array == NULL ? LMB_ERROR : __pa(new_array);
} else
- addr = lmb_find_base(new_size, sizeof(struct lmb_region), 0, LMB_ALLOC_ACCESSIBLE);
+ addr = lmb_find_area(0, lmb.current_limit, new_size, sizeof(struct lmb_region));
if (addr == LMB_ERROR) {
pr_err("lmb: Failed to double %s array from %ld to %ld entries !\n",
lmb_type_name(type), type->max, type->max * 2);
--
1.6.4.2


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