cma: Introduce cma_for_each_area

Frameworks (e.g. Ion) may want to iterate over each possible CMA area to
allow for enumeration. Introduce a function to allow a callback.

Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/cma.h b/include/linux/cma.h
index d41d1f8d1e281e7d336fd18d14ecb3e80e38541c..3e8fbf5a5c73ae1b0a40308de1158df65988c2fa 100644 (file)
--- a/include/linux/cma.h
+++ b/include/linux/cma.h
@@ -34,4 +34,6 @@ extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
 extern struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align,
                              gfp_t gfp_mask);
 extern bool cma_release(struct cma *cma, const struct page *pages, unsigned int count);
+
+extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
 #endif

diff --git a/mm/cma.c b/mm/cma.c
index 43c1b2c1ac67de714711142c541d2444b2850fd1..978b4a1441ef7120678e1fc7973b38c8ccf4dd5a 100644 (file)
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -504,3 +504,17 @@ bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
 
        return true;
 }
+
+int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data)
+{
+       int i;
+
+       for (i = 0; i < cma_area_count; i++) {
+               int ret = it(&cma_areas[i], data);
+
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}