Commit 68b6dbf1 authored by Sean Anderson's avatar Sean Anderson Committed by Christoph Hellwig
Browse files

dma-mapping: trace more error paths 



It can be surprising to the user if DMA functions are only traced on
success. On failure, it can be unclear what the source of the problem
is. Fix this by tracing all functions even when they fail. Cases where
we BUG/WARN are skipped, since those should be sufficiently noisy
already.

Signed-off-by: default avatarSean Anderson <sean.anderson@linux.dev>
Reviewed-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent c4484ab8

include/trace/events/dma.h

+36 −0
Original line number Diff line number Diff line
@@ -156,6 +156,7 @@ DEFINE_EVENT(dma_alloc_class, name, \ 


DEFINE_ALLOC_EVENT(dma_alloc);

DEFINE_ALLOC_EVENT(dma_alloc_pages);

DEFINE_ALLOC_EVENT(dma_alloc_sgt_err);



TRACE_EVENT(dma_alloc_sgt,

	TP_PROTO(struct device *dev, struct sg_table *sgt, size_t size,
@@ -320,6 +321,41 @@ TRACE_EVENT(dma_map_sg, 
		decode_dma_attrs(__entry->attrs))

);



TRACE_EVENT(dma_map_sg_err,

	TP_PROTO(struct device *dev, struct scatterlist *sgl, int nents,

		 int err, enum dma_data_direction dir, unsigned long attrs),

	TP_ARGS(dev, sgl, nents, err, dir, attrs),



	TP_STRUCT__entry(

		__string(device, dev_name(dev))

		__dynamic_array(u64, phys_addrs, nents)

		__field(int, err)

		__field(enum dma_data_direction, dir)

		__field(unsigned long, attrs)

	),



	TP_fast_assign(

		struct scatterlist *sg;

		int i;



		__assign_str(device);

		for_each_sg(sgl, sg, nents, i)

			((u64 *)__get_dynamic_array(phys_addrs))[i] = sg_phys(sg);

		__entry->err = err;

		__entry->dir = dir;

		__entry->attrs = attrs;

	),



	TP_printk("%s dir=%s dma_addrs=%s err=%d attrs=%s",

		__get_str(device),

		decode_dma_data_direction(__entry->dir),

		__print_array(__get_dynamic_array(phys_addrs),

			      __get_dynamic_array_len(phys_addrs) /

				sizeof(u64), sizeof(u64)),

		__entry->err,

		decode_dma_attrs(__entry->attrs))

);



TRACE_EVENT(dma_unmap_sg,

	TP_PROTO(struct device *dev, struct scatterlist *sgl, int nents,

		 enum dma_data_direction dir, unsigned long attrs),

kernel/dma/mapping.c

+18 −7
Original line number Diff line number Diff line
@@ -223,6 +223,7 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, 
		debug_dma_map_sg(dev, sg, nents, ents, dir, attrs);

	} else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM &&

				ents != -EIO && ents != -EREMOTEIO)) {

		trace_dma_map_sg_err(dev, sg, nents, ents, dir, attrs);

		return -EIO;

	}
@@ -604,20 +605,26 @@ void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, 
	if (WARN_ON_ONCE(flag & __GFP_COMP))

		return NULL;



	if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))

	if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr)) {

		trace_dma_alloc(dev, cpu_addr, *dma_handle, size,

				DMA_BIDIRECTIONAL, flag, attrs);

		return cpu_addr;

	}



	/* let the implementation decide on the zone to allocate from: */

	flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);



	if (dma_alloc_direct(dev, ops))

	if (dma_alloc_direct(dev, ops)) {

		cpu_addr = dma_direct_alloc(dev, size, dma_handle, flag, attrs);

	else if (use_dma_iommu(dev))

	} else if (use_dma_iommu(dev)) {

		cpu_addr = iommu_dma_alloc(dev, size, dma_handle, flag, attrs);

	else if (ops->alloc)

	} else if (ops->alloc) {

		cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);

	else

	} else {

		trace_dma_alloc(dev, NULL, 0, size, DMA_BIDIRECTIONAL, flag,

				attrs);

		return NULL;

	}



	trace_dma_alloc(dev, cpu_addr, *dma_handle, size, DMA_BIDIRECTIONAL,

			flag, attrs);
@@ -642,11 +649,11 @@ void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, 
	 */

	WARN_ON(irqs_disabled());



	trace_dma_free(dev, cpu_addr, dma_handle, size, DMA_BIDIRECTIONAL,

		       attrs);

	if (!cpu_addr)

		return;



	trace_dma_free(dev, cpu_addr, dma_handle, size, DMA_BIDIRECTIONAL,

		       attrs);

	debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);

	if (dma_alloc_direct(dev, ops))

		dma_direct_free(dev, size, cpu_addr, dma_handle, attrs);
@@ -688,6 +695,8 @@ struct page *dma_alloc_pages(struct device *dev, size_t size, 
		trace_dma_alloc_pages(dev, page_to_virt(page), *dma_handle,

				      size, dir, gfp, 0);

		debug_dma_map_page(dev, page, 0, size, dir, *dma_handle, 0);

	} else {

		trace_dma_alloc_pages(dev, NULL, 0, size, dir, gfp, 0);

	}

	return page;

}
@@ -772,6 +781,8 @@ struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size, 
		sgt->nents = 1;

		trace_dma_alloc_sgt(dev, sgt, size, dir, gfp, attrs);

		debug_dma_map_sg(dev, sgt->sgl, sgt->orig_nents, 1, dir, attrs);

	} else {

		trace_dma_alloc_sgt_err(dev, NULL, 0, size, gfp, dir, attrs);

	}

	return sgt;

}