[PATCH] dma-direct: take dma-ranges/offsets into account in resource mapping

[Serge Semin]

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@xxxxxxxxxxxxxxxxxxxx>

---

After a long discussion with Christoph and Robin regarding this patch
here:
https://lore.kernel.org/lkml/20220324014836.19149-4-Sergey.Semin@xxxxxxxxxxxxxxxxxxxx
and here
https://lore.kernel.org/linux-pci/20220503225104.12108-2-Sergey.Semin@xxxxxxxxxxxxxxxxxxxx/
It was decided to consult with wider maintainers audience whether it's ok
to accept the change as is or a more sophisticated solution needs to be
found for the non-linear direct MMIO mapping.

Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>

file: arch/arm/mach-orion5x/board-dt.c
Cc: Andrew Lunn <andrew@xxxxxxx>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
Cc: Gregory Clement <gregory.clement@xxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx

file: drivers/crypto/marvell/cesa/cesa.c
Cc: Srujana Challa <schalla@xxxxxxxxxxx>
Cc: Arnaud Ebalard <arno@xxxxxxxxxxxx>
Cc: Boris Brezillon <bbrezillon@xxxxxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx

file: drivers/dma/{fsl-edma-common.c,pl330.c,sh/rcar-dmac.c}
Cc: Vinod Koul <vkoul@xxxxxxxxxx>
Cc: dmaengine@xxxxxxxxxxxxxxx

file: arch/arm/boot/dts/{vfxxx.dtsi,ls1021a.dtsi,imx7ulp.dtsi,fsl-ls1043a.dtsi}
Cc: Shawn Guo <shawnguo@xxxxxxxxxx>
Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Cc: Li Yang <leoyang.li@xxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx

file: arch/arm/boot/dts/r8a77*.dtsi, arch/arm64/boot/dts/renesas/r8a77*.dtsi
Cc: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Cc: Magnus Damm <magnus.damm@xxxxxxxxx>
Cc: linux-renesas-soc@xxxxxxxxxxxxxxx

file: drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: "Christian König" <christian.koenig@xxxxxxx>
Cc: "Pan, Xinhui" <Xinhui.Pan@xxxxxxx>

file: drivers/gpu/drm/virtio/virtgpu_vram.c
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>

file: drivers/media/common/videobuf2/videobuf2-dma-contig.c
Cc: Tomasz Figa <tfiga@xxxxxxxxxxxx>
Cc: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>

file: drivers/misc/habanalabs/common/memory.c
Cc: Oded Gabbay <ogabbay@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

file: drivers/mtd/nand/raw/qcom_nandc.c
Cc: Manivannan Sadhasivam <mani@xxxxxxxxxx>

file: arch/arm64/boot/dts/qcom/{ipq8074.dtsi,ipq6018.dtsi,qcom-sdx55.dtsi,qcom-ipq4019.dtsi,qcom-ipq8064.dtsi}
Cc: Andy Gross <agross@xxxxxxxxxx>
Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Cc: linux-arm-msm@xxxxxxxxxxxxxxx

file: drivers/net/ethernet/marvell/octeontx2/af/rvu.c
Cc: Sunil Goutham <sgoutham@xxxxxxxxxxx>
Cc: Linu Cherian <lcherian@xxxxxxxxxxx>
Cc: Geetha sowjanya <gakula@xxxxxxxxxxx>

file: drivers/ntb/ntb_transport.c
Cc: Jon Mason <jdmason@xxxxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: ntb@xxxxxxxxxxxxxxx
---
 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 9743c6ccce1a..bc06db74dfdb 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -497,7 +497,7 @@ 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,
-- 
2.35.1