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dma-mapping fixes for 4.19-rc2

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A few fixes for the fallout of being a little more pedantic about
 dma masks.
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Merge tag 'dma-mapping-4.19-2' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fixes from Christoph Hellwig:
 "A few fixes for the fallout of being a little more pedantic about dma
  masks"

* tag 'dma-mapping-4.19-2' of git://git.infradead.org/users/hch/dma-mapping:
  of/platform: initialise AMBA default DMA masks
  sparc: set a default 32-bit dma mask for OF devices
  kernel/dma/direct: take DMA offset into account in dma_direct_supported
This commit is contained in:
Linus Torvalds 2018-09-02 20:09:36 -07:00
commit 60c1f89241
4 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/sparc/kernel/of_device_32.c
View File

@ -9,6 +9,7 @@
#include <linux/irq.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>
#include <asm/leon.h>
#include <asm/leon_amba.h>
@ -381,6 +382,9 @@ static struct platform_device * __init scan_one_device(struct device_node *dp,
else
dev_set_name(&op->dev, "%08x", dp->phandle);
op->dev.coherent_dma_mask = DMA_BIT_MASK(32);
op->dev.dma_mask = &op->dev.coherent_dma_mask;
if (of_device_register(op)) {
printk("%s: Could not register of device.\n",
dp->full_name);

3
arch/sparc/kernel/of_device_64.c
View File

@ -2,6 +2,7 @@
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/mod_devicetable.h>
@ -675,6 +676,8 @@ static struct platform_device * __init scan_one_device(struct device_node *dp,
dev_set_name(&op->dev, "root");
else
dev_set_name(&op->dev, "%08x", dp->phandle);
op->dev.coherent_dma_mask = DMA_BIT_MASK(32);
op->dev.dma_mask = &op->dev.coherent_dma_mask;
if (of_device_register(op)) {
printk("%s: Could not register of device.\n",

4
drivers/of/platform.c
View File

@ -241,6 +241,10 @@ static struct amba_device *of_amba_device_create(struct device_node *node,
if (!dev)
goto err_clear_flag;
/* AMBA devices only support a single DMA mask */
dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
/* setup generic device info */
dev->dev.of_node = of_node_get(node);
dev->dev.fwnode = &node->fwnode;

4
kernel/dma/direct.c
View File

@ -168,7 +168,7 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
int dma_direct_supported(struct device *dev, u64 mask)
{
#ifdef CONFIG_ZONE_DMA
if (mask < DMA_BIT_MASK(ARCH_ZONE_DMA_BITS))
if (mask < phys_to_dma(dev, DMA_BIT_MASK(ARCH_ZONE_DMA_BITS)))
return 0;
#else
/*
@ -177,7 +177,7 @@ int dma_direct_supported(struct device *dev, u64 mask)
* memory, or by providing a ZONE_DMA32. If neither is the case, the
* architecture needs to use an IOMMU instead of the direct mapping.
*/
if (mask < DMA_BIT_MASK(32))
if (mask < phys_to_dma(dev, DMA_BIT_MASK(32)))
return 0;
#endif
/*