Messages in this thread Patch in this message |  | | From | "GuoRui.Yu" <> | Subject | [PATCH 3/4] swiotlb: Add tracepoint swiotlb_unbounced | Date | Sat, 28 Jan 2023 16:32:53 +0800 |
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Add a new tracepoint swiotlb_unbounced to facilitate statistics of swiotlb buffer usage.
Signed-off-by: GuoRui.Yu <GuoRui.Yu@linux.alibaba.com> --- include/trace/events/swiotlb.h | 28 ++++++++++++++++++++++++++++ kernel/dma/common-swiotlb.c | 1 + 2 files changed, 29 insertions(+)
diff --git a/include/trace/events/swiotlb.h b/include/trace/events/swiotlb.h index da05c9ebd224..0707adc34df5 100644 --- a/include/trace/events/swiotlb.h +++ b/include/trace/events/swiotlb.h @@ -35,6 +35,34 @@ TRACE_EVENT(swiotlb_bounced, __entry->force ? "FORCE" : "NORMAL") ); +TRACE_EVENT(swiotlb_unbounced, + TP_PROTO(struct device *dev, dma_addr_t dev_addr, size_t size), + TP_ARGS(dev, dev_addr, size), + + TP_STRUCT__entry( + __string(dev_name, dev_name(dev)) + __field(u64, dma_mask) + __field(dma_addr_t, dev_addr) + __field(size_t, size) + __field(bool, force) + ), + + TP_fast_assign( + __assign_str(dev_name, dev_name(dev)); + __entry->dma_mask = (dev->dma_mask ? *dev->dma_mask : 0); + __entry->dev_addr = dev_addr; + __entry->size = size; + __entry->force = is_swiotlb_force_bounce(dev); + ), + + TP_printk("dev_name: %s dma_mask=%llx dev_addr=%llx size=%zu %s", + __get_str(dev_name), + __entry->dma_mask, + (unsigned long long)__entry->dev_addr, + __entry->size, + __entry->force ? "FORCE" : "NORMAL") +); + #endif /* _TRACE_SWIOTLB_H */ /* This part must be outside protection */ diff --git a/kernel/dma/common-swiotlb.c b/kernel/dma/common-swiotlb.c index 553325d5c9cd..e3676a8358f2 100644 --- a/kernel/dma/common-swiotlb.c +++ b/kernel/dma/common-swiotlb.c @@ -46,6 +46,7 @@ void swiotlb_tbl_unmap_single(struct device *dev, phys_addr_t tlb_addr, size_t mapping_size, enum dma_data_direction dir, unsigned long attrs) { + trace_swiotlb_unbounced(dev, phys_to_dma(dev, tlb_addr), mapping_size); /* * First, sync the memory before unmapping the entry */ -- 2.31.1
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