linux-kernel - [RFC PATCHv2 02/21] cma: Introduce cma_for_each

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Message-Id: <1489798493-16600-3-git-send-email-labbott@redhat.com>
Date:   Fri, 17 Mar 2017 17:54:34 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Sumit Semwal <sumit.semwal@...aro.org>,
        Riley Andrews <riandrews@...roid.com>, arve@...roid.com
Cc:     Laura Abbott <labbott@...hat.com>, romlem@...gle.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Brian Starkey <brian.starkey@....com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Mark Brown <broonie@...nel.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        linux-mm@...ck.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: [RFC PATCHv2 02/21] 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@...hat.com>
---
 include/linux/cma.h |  2 ++
 mm/cma.c            | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/cma.h b/include/linux/cma.h
index d41d1f8..3e8fbf5 100644
--- 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 0d187b1..9a040e1 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -498,3 +498,17 @@ 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;
+}
-- 
2.7.4