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dma-direct: improve DMA mask overflow reporting

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Remove the unset dma_mask case as that won't get into mapping calls
anymore, and also report the other errors unconditonally and with a
slightly improved message.  Remove the now pointless report_addr helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad@darnok.org>
This commit is contained in:
Christoph Hellwig 2020-02-03 14:54:50 +01:00
parent 4a47cbae04
commit 75467ee48a
1 changed files with 7 additions and 14 deletions
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21
kernel/dma/direct.c
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@ -23,18 +23,6 @@
*/
unsigned int zone_dma_bits __ro_after_init = 24;
static void report_addr(struct device *dev, dma_addr_t dma_addr, size_t size)
{
if (!dev->dma_mask) {
dev_err_once(dev, "DMA map on device without dma_mask\n");
} else if (*dev->dma_mask >= DMA_BIT_MASK(32) || dev->bus_dma_limit) {
dev_err_once(dev,
"overflow %pad+%zu of DMA mask %llx bus limit %llx\n",
&dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);
}
WARN_ON_ONCE(1);
}
static inline dma_addr_t phys_to_dma_direct(struct device *dev,
phys_addr_t phys)
{
@ -371,7 +359,9 @@ dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
if (swiotlb_force != SWIOTLB_NO_FORCE)
return swiotlb_map(dev, phys, size, dir, attrs);
report_addr(dev, dma_addr, size);
dev_WARN_ONCE(dev, 1,
"DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",
&dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);
return DMA_MAPPING_ERROR;
}
@ -409,7 +399,10 @@ dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
dma_addr_t dma_addr = paddr;
if (unlikely(!dma_capable(dev, dma_addr, size, false))) {
report_addr(dev, dma_addr, size);
dev_err_once(dev,
"DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",
&dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);
WARN_ON_ONCE(1);
return DMA_MAPPING_ERROR;
}