lmb: Add support of flags for no-map properties
Add "flags" in lmb_property to save the "no-map" property of
reserved region and a new function lmb_reserve_flags() to check
this flag.
The default allocation use flags = LMB_NONE.
The adjacent reserved memory region are merged only when they have
the same flags value.
This patch is partially based on flags support done in Linux kernel
mm/memblock .c (previously lmb.c); it is why LMB_NOMAP = 0x4, it is
aligned with MEMBLOCK_NOMAP value.
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/lmb.h b/include/lmb.h
index 541e170..e900b3d 100644
--- a/include/lmb.h
+++ b/include/lmb.h
@@ -13,6 +13,16 @@
*/
/**
+ * enum lmb_flags - definition of memory region attributes
+ * @LMB_NONE: no special request
+ * @LMB_NOMAP: don't add to mmu configuration
+ */
+enum lmb_flags {
+ LMB_NONE = 0x0,
+ LMB_NOMAP = 0x4,
+};
+
+/**
* struct lmb_property - Description of one region.
*
* @base: Base address of the region.
@@ -21,6 +31,7 @@
struct lmb_property {
phys_addr_t base;
phys_size_t size;
+ enum lmb_flags flags;
};
/**
@@ -69,6 +80,17 @@
phys_size_t size, void *fdt_blob);
extern long lmb_add(struct lmb *lmb, phys_addr_t base, phys_size_t size);
extern long lmb_reserve(struct lmb *lmb, phys_addr_t base, phys_size_t size);
+/**
+ * lmb_reserve_flags - Reserve one region with a specific flags bitfield.
+ *
+ * @lmb the logical memory block struct
+ * @base base address of the memory region
+ * @size size of the memory region
+ * @flags flags for the memory region
+ * @return 0 if OK, > 0 for coalesced region or a negative error code.
+ */
+long lmb_reserve_flags(struct lmb *lmb, phys_addr_t base,
+ phys_size_t size, enum lmb_flags flags);
extern phys_addr_t lmb_alloc(struct lmb *lmb, phys_size_t size, ulong align);
extern phys_addr_t lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align,
phys_addr_t max_addr);
@@ -92,6 +114,13 @@
void board_lmb_reserve(struct lmb *lmb);
void arch_lmb_reserve(struct lmb *lmb);
+/* Low level functions */
+
+static inline bool lmb_is_nomap(struct lmb_property *m)
+{
+ return m->flags & LMB_NOMAP;
+}
+
#endif /* __KERNEL__ */
#endif /* _LINUX_LMB_H */