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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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	Dave Stevenson <dave.stevenson@raspberrypi.com>
Subject: [PATCH 01/18] dma-direct: take dma-ranges/offsets into account in resource mapping
Date: Fri, 24 May 2024 19:26:45 +0100
Message-Id: <20240524182702.1317935-2-dave.stevenson@raspberrypi.com>
In-Reply-To: <20240524182702.1317935-1-dave.stevenson@raspberrypi.com>
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From: Serge Semin <Sergey.Semin@baikalelectronics.ru>

A basic device-specific linear memory mapping was introduced back in
commit ("dma: Take into account dma_pfn_offset") as a single-valued offset
preserved in the device.dma_pfn_offset field, which was initialized for
instance by means of the "dma-ranges" DT property. Afterwards the
functionality was extended to support more than one device-specific region
defined in the device.dma_range_map list of maps. But all of these
improvements concerned a single pointer, page or sg DMA-mapping methods,
while the system resource mapping function turned to miss the
corresponding modification. Thus the dma_direct_map_resource() method now
just casts the CPU physical address to the device DMA address with no
dma-ranges-based mapping taking into account, which is obviously wrong.
Let's fix it by using the phys_to_dma_direct() method to get the
device-specific bus address from the passed memory resource for the case
of the directly mapped DMA.

Fixes: 25f1e1887088 ("dma: Take into account dma_pfn_offset")
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 kernel/dma/direct.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 4d543b1e9d57..916a16959575 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -509,7 +509,7 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
 dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
 		size_t size, enum dma_data_direction dir, unsigned long attrs)
 {
-	dma_addr_t dma_addr = paddr;
+	dma_addr_t dma_addr = phys_to_dma_direct(dev, paddr);
 
 	if (unlikely(!dma_capable(dev, dma_addr, size, false))) {
 		dev_err_once(dev,
-- 
2.34.1