This is a note to let you know that I've just added the patch titled
net: macb: Align the dma and coherent dma masks
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-macb-align-the-dma-and-coherent-dma-masks.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f9acb9925022603da03cf52c2df88b46a952dfbb
Author: Marc St-Amand <mstamand@xxxxxxxxx>
Date: Wed Feb 9 15:13:25 2022 +0530
net: macb: Align the dma and coherent dma masks
[ Upstream commit 37f7860602b5b2d99fc7465f6407f403f5941988 ]
Single page and coherent memory blocks can use different DMA masks
when the macb accesses physical memory directly. The kernel is clever
enough to allocate pages that fit into the requested address width.
When using the ARM SMMU, the DMA mask must be the same for single
pages and big coherent memory blocks. Otherwise the translation
tables turn into one big mess.
[ 74.959909] macb ff0e0000.ethernet eth0: DMA bus error: HRESP not OK
[ 74.959989] arm-smmu fd800000.smmu: Unhandled context fault: fsr=0x402, iova=0x3165687460, fsynr=0x20001, cbfrsynra=0x877, cb=1
[ 75.173939] macb ff0e0000.ethernet eth0: DMA bus error: HRESP not OK
[ 75.173955] arm-smmu fd800000.smmu: Unhandled context fault: fsr=0x402, iova=0x3165687460, fsynr=0x20001, cbfrsynra=0x877, cb=1
Since using the same DMA mask does not hurt direct 1:1 physical
memory mappings, this commit always aligns DMA and coherent masks.
Signed-off-by: Marc St-Amand <mstamand@xxxxxxxxx>
Signed-off-by: Harini Katakam <harini.katakam@xxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Tested-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index d110aa616a957..f162ac7d74e59 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -4073,7 +4073,7 @@ static int macb_probe(struct platform_device *pdev)
#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
if (GEM_BFEXT(DAW64, gem_readl(bp, DCFG6))) {
- dma_set_mask(&pdev->dev, DMA_BIT_MASK(44));
+ dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
bp->hw_dma_cap |= HW_DMA_CAP_64B;
}
#endif
