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Subject[PATCH V8 2/4] genalloc:support memory-allocation from offset
Date
Add new algo for genalloc, it finds the first available region
from a specific offset address of memory matching the size
requirement (no alignment constraint)

Signed-off-by: Zhao Qiang <qiang.zhao@freescale.com>
---
include/linux/genalloc.h | 11 +++++++++++
lib/genalloc.c | 26 ++++++++++++++++++++++++++
2 files changed, 37 insertions(+)

diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index aaf3dc2..c384791 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -82,6 +82,13 @@ struct genpool_data_align {
int align; /* alignment by bytes for starting address */
};

+/*
+ * gen_pool data descriptor for gen_pool_first_fit_offset.
+ */
+struct genpool_data_offset {
+ unsigned long offset; /* The offset to start searching at */
+};
+
extern struct gen_pool *gen_pool_create(int, int);
extern phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long);
extern int gen_pool_add_virt(struct gen_pool *, unsigned long, phys_addr_t,
@@ -121,6 +128,10 @@ extern unsigned long gen_pool_first_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data,
struct gen_pool *pool);

+extern unsigned long gen_pool_first_fit_offset(unsigned long *map,
+ unsigned long size, unsigned long start, unsigned int nr,
+ void *data, struct gen_pool *pool);
+
extern unsigned long gen_pool_first_fit_align(unsigned long *map,
unsigned long size, unsigned long start, unsigned int nr,
void *data, struct gen_pool *pool);
diff --git a/lib/genalloc.c b/lib/genalloc.c
index b8762b1..b4f9182 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -554,6 +554,32 @@ unsigned long gen_pool_first_fit_align(unsigned long *map, unsigned long size,
EXPORT_SYMBOL(gen_pool_first_fit_align);

/**
+ * gen_pool_first_fit_offset - find the first available region
+ * from a specific offset address of memory matching the size
+ * requirement (no alignment constraint)
+ * @map: The address to base the search on
+ * @size: The bitmap size in bits
+ * @start: The bitnumber to start searching at
+ * @nr: The number of zeroed bits we're looking for
+ * @data: data for alignment
+ * @pool: pool to get order from
+ */
+unsigned long gen_pool_first_fit_offset(unsigned long *map, unsigned long size,
+ unsigned long start, unsigned int nr, void *data,
+ struct gen_pool *pool)
+{
+ struct genpool_data_offset *offset_data;
+ int order;
+ unsigned long offset_bit;
+
+ offset_data = data;
+ order = pool->min_alloc_order;
+ offset_bit = (offset_data->offset + (1UL << order) - 1) >> order;
+ return bitmap_find_next_zero_area(map, size, start + offset_bit, nr, 0);
+}
+EXPORT_SYMBOL(gen_pool_first_fit_offset);
+
+/**
* gen_pool_first_fit_order_align - find the first available region
* of memory matching the size requirement. The region will be aligned
* to the order of the size specified.
--
2.1.0.27.g96db324


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