linux-kernel - [RFC][PATCH 3/4] dma-buf: cma_heap: Extend logic to export CMA regions tagged with "linux,cma-heap"

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Message-Id: <20200501073949.120396-4-john.stultz@linaro.org>
Date:   Fri,  1 May 2020 07:39:48 +0000
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        "Andrew F. Davis" <afd@...com>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Liam Mark <lmark@...eaurora.org>,
        Pratik Patel <pratikp@...eaurora.org>,
        Laura Abbott <labbott@...hat.com>,
        Brian Starkey <Brian.Starkey@....com>,
        Chenbo Feng <fengc@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Sandeep Patil <sspatil@...gle.com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-mm@...ck.org
Subject: [RFC][PATCH 3/4] dma-buf: cma_heap: Extend logic to export CMA regions tagged with "linux,cma-heap"

This patch reworks the cma_heap initialization so that
we expose both the default CMA region and any CMA regions
tagged with "linux,cma-heap" in the device-tree.

Cc: Rob Herring <robh+dt@...nel.org>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Cc: "Andrew F. Davis" <afd@...com>
Cc: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Cc: Liam Mark <lmark@...eaurora.org>
Cc: Pratik Patel <pratikp@...eaurora.org>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Brian Starkey <Brian.Starkey@....com>
Cc: Chenbo Feng <fengc@...gle.com>
Cc: Alistair Strachan <astrachan@...gle.com>
Cc: Sandeep Patil <sspatil@...gle.com>
Cc: Hridya Valsaraju <hridya@...gle.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: devicetree@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-mm@...ck.org
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/dma-buf/heaps/cma_heap.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c
index 626cf7fd033a..dd154e2db101 100644
--- a/drivers/dma-buf/heaps/cma_heap.c
+++ b/drivers/dma-buf/heaps/cma_heap.c
@@ -141,6 +141,11 @@ static int __add_cma_heap(struct cma *cma, void *data)
 {
 	struct cma_heap *cma_heap;
 	struct dma_heap_export_info exp_info;
+	struct cma *default_cma = dev_get_cma_area(NULL);
+
+	/* We only add the default heap and explicitly tagged heaps */
+	if (cma != default_cma && !cma_dma_heap_enabled(cma))
+		return 0;
 
 	cma_heap = kzalloc(sizeof(*cma_heap), GFP_KERNEL);
 	if (!cma_heap)
@@ -162,16 +167,11 @@ static int __add_cma_heap(struct cma *cma, void *data)
 	return 0;
 }
 
-static int add_default_cma_heap(void)
+static int cma_heaps_init(void)
 {
-	struct cma *default_cma = dev_get_cma_area(NULL);
-	int ret = 0;
-
-	if (default_cma)
-		ret = __add_cma_heap(default_cma, NULL);
-
-	return ret;
+	cma_for_each_area(__add_cma_heap, NULL);
+	return 0;
 }
-module_init(add_default_cma_heap);
+module_init(cma_heaps_init);
 MODULE_DESCRIPTION("DMA-BUF CMA Heap");
 MODULE_LICENSE("GPL v2");
-- 
2.17.1