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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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On architectures like arm64, swiotlb is tied intimately to the core architecture DMA support. In addition, ZONE_DMA cannot be disabled. To aid debugging and catch devices not supporting DMA to memory outside the 32-bit address space, add a kernel command line option "swiotlb=noforce", which disables the use of bounce buffers. If specified, trying to map memory that cannot be used with DMA will fail, and a rate-limited warning will be printed. Note that io_tlb_nslabs is set to 1, which is the minimal supported value. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
#undef TRACE_SYSTEM
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#define TRACE_SYSTEM swiotlb
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#if !defined(_TRACE_SWIOTLB_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_SWIOTLB_H
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#include <linux/tracepoint.h>
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TRACE_EVENT(swiotlb_bounced,
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TP_PROTO(struct device *dev,
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dma_addr_t dev_addr,
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size_t size,
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enum swiotlb_force swiotlb_force),
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TP_ARGS(dev, dev_addr, size, swiotlb_force),
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TP_STRUCT__entry(
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__string( dev_name, dev_name(dev) )
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__field( u64, dma_mask )
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__field( dma_addr_t, dev_addr )
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__field( size_t, size )
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__field( enum swiotlb_force, swiotlb_force )
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),
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TP_fast_assign(
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__assign_str(dev_name, dev_name(dev));
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__entry->dma_mask = (dev->dma_mask ? *dev->dma_mask : 0);
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__entry->dev_addr = dev_addr;
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__entry->size = size;
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__entry->swiotlb_force = swiotlb_force;
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),
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TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx "
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"size=%zu %s",
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__get_str(dev_name),
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__entry->dma_mask,
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(unsigned long long)__entry->dev_addr,
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__entry->size,
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__print_symbolic(__entry->swiotlb_force,
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{ SWIOTLB_NORMAL, "NORMAL" },
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{ SWIOTLB_FORCE, "FORCE" },
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{ SWIOTLB_NO_FORCE, "NO_FORCE" }))
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);
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#endif /* _TRACE_SWIOTLB_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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