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of/device: Update dma_range_map only when dev has valid dma-ranges 

The commit e0d072782c ("dma-mapping: introduce DMA range map,
supplanting dma_pfn_offset") always update dma_range_map even though it was
already set, like in the sunxi_mbus driver. the issue is reported at [1].
This patch avoid this(Updating it only when dev has valid dma-ranges).

Meanwhile, dma_range_map contains the devices' dma_ranges information,
This patch moves dma_range_map before of_iommu_configure. The iommu
driver may need to know the dma_address requirements of its iommu
consumer devices.

[1] https://lore.kernel.org/linux-arm-kernel/5c7946f3-b56e-da00-a750-be097c7ceb32@arm.com/

CC: Frank Rowand <frowand.list@gmail.com>
Fixes: e0d072782c ("dma-mapping: introduce DMA range map, supplanting dma_pfn_offset"),
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210119105203.15530-1-yong.wu@mediatek.com
This commit is contained in:
Yong Wu 2021-01-19 18:52:03 +08:00 committed by Rob Herring
parent 30596ae054
commit 89c7cb1608
1 changed files with 7 additions and 3 deletions
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10
drivers/of/device.c
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@ -162,9 +162,11 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
mask = DMA_BIT_MASK(ilog2(end) + 1);
dev->coherent_dma_mask &= mask;
*dev->dma_mask &= mask;
/* ...but only set bus limit if we found valid dma-ranges earlier */
if (!ret)
/* ...but only set bus limit and range map if we found valid dma-ranges earlier */
if (!ret) {
dev->bus_dma_limit = end;
dev->dma_range_map = map;
}
coherent = of_dma_is_coherent(np);
dev_dbg(dev, "device is%sdma coherent\n",
@ -172,6 +174,9 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
iommu = of_iommu_configure(dev, np, id);
if (PTR_ERR(iommu) == -EPROBE_DEFER) {
/* Don't touch range map if it wasn't set from a valid dma-ranges */
if (!ret)
dev->dma_range_map = NULL;
kfree(map);
return -EPROBE_DEFER;
}
@ -181,7 +186,6 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
arch_setup_dma_ops(dev, dma_start, size, iommu, coherent);
dev->dma_range_map = map;
return 0;
}
EXPORT_SYMBOL_GPL(of_dma_configure_id);