linux-kernel - [PATCH] kernel/dma: export dma_alloc_from

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Message-ID: <20190711053343.28873-1-miles.chen@mediatek.com>
Date:   Thu, 11 Jul 2019 13:33:43 +0800
From:   <miles.chen@...iatek.com>
To:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>
CC:     <linux-kernel@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
        <wsd_upstream@...iatek.com>, <linux-mediatek@...ts.infradead.org>,
        Miles Chen <miles.chen@...iatek.com>
Subject: [PATCH] kernel/dma: export dma_alloc_from_contiguous to modules

From: Miles Chen <miles.chen@...iatek.com>

This change exports dma_alloc_from_contiguous and
dma_release_from_contiguous to modules.

Currently, we can add a reserve a memory node in dts files, make
it a CMA memory by setting compatible = "shared-dma-pool",
and setup the dev->cma_area by using of_reserved_mem_device_init_by_idx().

Export dma_alloc_from_contiguous and dma_release_from_contiguous, so we
can allocate/free from/to dev->cma_area in kernel modules.

Signed-off-by: Miles Chen <miles.chen@...iatek.com>
---
 kernel/dma/contiguous.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index b2a87905846d..d5920bdedc77 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -197,6 +197,7 @@ struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
 
 	return cma_alloc(dev_get_cma_area(dev), count, align, no_warn);
 }
+EXPORT_SYMBOL_GPL(dma_alloc_from_contiguous);
 
 /**
  * dma_release_from_contiguous() - release allocated pages
@@ -213,6 +214,7 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages,
 {
 	return cma_release(dev_get_cma_area(dev), pages, count);
 }
+EXPORT_SYMBOL_GPL(dma_release_from_contiguous);
 
 /*
  * Support for reserved memory regions defined in device tree
-- 
2.18.0