1 files changed, 95 insertions, 0 deletions
diff --git a/mm/cma.h b/mm/cma.h
new file mode 100644
index 000000000000..c70180c36559
--- /dev/null
+++ b/mm/cma.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __MM_CMA_H__
+#define __MM_CMA_H__
+
+#include <linux/debugfs.h>
+#include <linux/kobject.h>
+
+struct cma_kobject {
+	struct kobject kobj;
+	struct cma *cma;
+};
+
+/*
+ * Multi-range support. This can be useful if the size of the allocation
+ * is not expected to be larger than the alignment (like with hugetlb_cma),
+ * and the total amount of memory requested, while smaller than the total
+ * amount of memory available, is large enough that it doesn't fit in a
+ * single physical memory range because of memory holes.
+ *
+ * Fields:
+ *   @base_pfn: physical address of range
+ *   @early_pfn: first PFN not reserved through cma_reserve_early
+ *   @count: size of range
+ *   @bitmap: bitmap of allocated (1 << order_per_bit)-sized chunks.
+ */
+struct cma_memrange {
+	unsigned long base_pfn;
+	unsigned long count;
+	union {
+		unsigned long early_pfn;
+		unsigned long *bitmap;
+	};
+#ifdef CONFIG_CMA_DEBUGFS
+	struct debugfs_u32_array dfs_bitmap;
+#endif
+};
+#define CMA_MAX_RANGES 8
+
+struct cma {
+	unsigned long   count;
+	unsigned long	available_count;
+	unsigned int order_per_bit; /* Order of pages represented by one bit */
+	spinlock_t	lock;
+	struct mutex alloc_mutex;
+#ifdef CONFIG_CMA_DEBUGFS
+	struct hlist_head mem_head;
+	spinlock_t mem_head_lock;
+#endif
+	char name[CMA_MAX_NAME];
+	int nranges;
+	struct cma_memrange ranges[CMA_MAX_RANGES];
+#ifdef CONFIG_CMA_SYSFS
+	/* the number of CMA page successful allocations */
+	atomic64_t nr_pages_succeeded;
+	/* the number of CMA page allocation failures */
+	atomic64_t nr_pages_failed;
+	/* the number of CMA page released */
+	atomic64_t nr_pages_released;
+	/* kobject requires dynamic object */
+	struct cma_kobject *cma_kobj;
+#endif
+	unsigned long flags;
+	/* NUMA node (NUMA_NO_NODE if unspecified) */
+	int nid;
+};
+
+enum cma_flags {
+	CMA_RESERVE_PAGES_ON_ERROR,
+	CMA_ZONES_VALID,
+	CMA_ZONES_INVALID,
+	CMA_ACTIVATED,
+};
+
+extern struct cma cma_areas[MAX_CMA_AREAS];
+extern unsigned int cma_area_count;
+
+static inline unsigned long cma_bitmap_maxno(struct cma *cma,
+		struct cma_memrange *cmr)
+{
+	return cmr->count >> cma->order_per_bit;
+}
+
+#ifdef CONFIG_CMA_SYSFS
+void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages);
+void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages);
+void cma_sysfs_account_release_pages(struct cma *cma, unsigned long nr_pages);
+#else
+static inline void cma_sysfs_account_success_pages(struct cma *cma,
+						   unsigned long nr_pages) {};
+static inline void cma_sysfs_account_fail_pages(struct cma *cma,
+						unsigned long nr_pages) {};
+static inline void cma_sysfs_account_release_pages(struct cma *cma,
+						   unsigned long nr_pages) {};
+#endif
+#endif