1 files changed, 59 insertions, 0 deletions
diff --git a/include/linux/cma.h b/include/linux/cma.h
new file mode 100644
index 000000000..63873b93d
--- /dev/null
+++ b/include/linux/cma.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __CMA_H__
+#define __CMA_H__
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/numa.h>
+
+/*
+ * There is always at least global CMA area and a few optional
+ * areas configured in kernel .config.
+ */
+#ifdef CONFIG_CMA_AREAS
+#define MAX_CMA_AREAS	(1 + CONFIG_CMA_AREAS)
+#endif
+
+#define CMA_MAX_NAME 64
+
+/*
+ *  the buddy -- especially pageblock merging and alloc_contig_range()
+ * -- can deal with only some pageblocks of a higher-order page being
+ *  MIGRATE_CMA, we can use pageblock_nr_pages.
+ */
+#define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages
+#define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
+
+struct cma;
+
+extern unsigned long totalcma_pages;
+extern phys_addr_t cma_get_base(const struct cma *cma);
+extern unsigned long cma_get_size(const struct cma *cma);
+extern const char *cma_get_name(const struct cma *cma);
+
+extern int __init cma_declare_contiguous_nid(phys_addr_t base,
+			phys_addr_t size, phys_addr_t limit,
+			phys_addr_t alignment, unsigned int order_per_bit,
+			bool fixed, const char *name, struct cma **res_cma,
+			int nid);
+static inline int __init cma_declare_contiguous(phys_addr_t base,
+			phys_addr_t size, phys_addr_t limit,
+			phys_addr_t alignment, unsigned int order_per_bit,
+			bool fixed, const char *name, struct cma **res_cma)
+{
+	return cma_declare_contiguous_nid(base, size, limit, alignment,
+			order_per_bit, fixed, name, res_cma, NUMA_NO_NODE);
+}
+extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
+					unsigned int order_per_bit,
+					const char *name,
+					struct cma **res_cma);
+extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
+			      bool no_warn);
+extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
+extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
+
+extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
+
+extern void cma_reserve_pages_on_error(struct cma *cma);
+#endif