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Message-Id: <20241018150036.2878190-4-sean.anderson@linux.dev>
Date: Fri, 18 Oct 2024 11:00:36 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Christoph Hellwig <hch@....de>,
iommu@...ts.linux.dev
Cc: Robin Murphy <robin.murphy@....com>,
linux-trace-kernel@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
linux-kernel@...r.kernel.org,
Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH v2 3/4] dma-mapping: Use trace_dma_alloc for dma_alloc* instead of using trace_dma_map
In some cases, we use trace_dma_map to trace dma_alloc* functions. This
generally follows dma_debug. However, this does not record all of the
relevant information for allocations, such as GFP flags. Create new
dma_alloc tracepoints for these functions. Note that while
dma_alloc_noncontiguous may allocate discontiguous pages (from the CPU's
point of view), the device will only see one contiguous mapping.
Therefore, we just need to trace dma_addr and size.
Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
---
Changes in v2:
- Use macros to define events in a class
include/trace/events/dma.h | 99 +++++++++++++++++++++++++++++++++++++-
kernel/dma/mapping.c | 10 ++--
2 files changed, 102 insertions(+), 7 deletions(-)
diff --git a/include/trace/events/dma.h b/include/trace/events/dma.h
index 267cfa49d9d5..7a9606b8934e 100644
--- a/include/trace/events/dma.h
+++ b/include/trace/events/dma.h
@@ -112,7 +112,7 @@ DEFINE_EVENT(dma_unmap, name, \
DEFINE_UNMAP_EVENT(dma_unmap_page);
DEFINE_UNMAP_EVENT(dma_unmap_resource);
-TRACE_EVENT(dma_alloc,
+DECLARE_EVENT_CLASS(dma_alloc_class,
TP_PROTO(struct device *dev, void *virt_addr, dma_addr_t dma_addr,
size_t size, enum dma_data_direction dir, gfp_t flags,
unsigned long attrs),
@@ -147,7 +147,58 @@ TRACE_EVENT(dma_alloc,
decode_dma_attrs(__entry->attrs))
);
-TRACE_EVENT(dma_free,
+#define DEFINE_ALLOC_EVENT(name) \
+DEFINE_EVENT(dma_alloc_class, name, \
+ TP_PROTO(struct device *dev, void *virt_addr, dma_addr_t dma_addr, \
+ size_t size, enum dma_data_direction dir, gfp_t flags, \
+ unsigned long attrs), \
+ TP_ARGS(dev, virt_addr, dma_addr, size, dir, flags, attrs))
+
+DEFINE_ALLOC_EVENT(dma_alloc);
+DEFINE_ALLOC_EVENT(dma_alloc_pages);
+
+TRACE_EVENT(dma_alloc_sgt,
+ TP_PROTO(struct device *dev, struct sg_table *sgt, size_t size,
+ enum dma_data_direction dir, gfp_t flags, unsigned long attrs),
+ TP_ARGS(dev, sgt, size, dir, flags, attrs),
+
+ TP_STRUCT__entry(
+ __string(device, dev_name(dev))
+ __dynamic_array(u64, phys_addrs, sgt->orig_nents)
+ __field(u64, dma_addr)
+ __field(size_t, size)
+ __field(enum dma_data_direction, dir)
+ __field(gfp_t, flags)
+ __field(unsigned long, attrs)
+ ),
+
+ TP_fast_assign(
+ struct scatterlist *sg;
+ int i;
+
+ __assign_str(device);
+ for_each_sg(sgt->sgl, sg, sgt->orig_nents, i)
+ ((u64 *)__get_dynamic_array(phys_addrs))[i] = sg_phys(sg);
+ __entry->dma_addr = sg_dma_address(sgt->sgl);
+ __entry->size = size;
+ __entry->dir = dir;
+ __entry->flags = flags;
+ __entry->attrs = attrs;
+ ),
+
+ TP_printk("%s dir=%s dma_addr=%llx size=%zu phys_addrs=%s flags=%s attrs=%s",
+ __get_str(device),
+ decode_dma_data_direction(__entry->dir),
+ __entry->dma_addr,
+ __entry->size,
+ __print_array(__get_dynamic_array(phys_addrs),
+ __get_dynamic_array_len(phys_addrs) /
+ sizeof(u64), sizeof(u64)),
+ show_gfp_flags(__entry->flags),
+ decode_dma_attrs(__entry->attrs))
+);
+
+DECLARE_EVENT_CLASS(dma_free_class,
TP_PROTO(struct device *dev, void *virt_addr, dma_addr_t dma_addr,
size_t size, enum dma_data_direction dir, unsigned long attrs),
TP_ARGS(dev, virt_addr, dma_addr, size, dir, attrs),
@@ -179,6 +230,50 @@ TRACE_EVENT(dma_free,
decode_dma_attrs(__entry->attrs))
);
+#define DEFINE_FREE_EVENT(name) \
+DEFINE_EVENT(dma_free_class, name, \
+ TP_PROTO(struct device *dev, void *virt_addr, dma_addr_t dma_addr, \
+ size_t size, enum dma_data_direction dir, unsigned long attrs), \
+ TP_ARGS(dev, virt_addr, dma_addr, size, dir, attrs))
+
+DEFINE_FREE_EVENT(dma_free);
+DEFINE_FREE_EVENT(dma_free_pages);
+
+TRACE_EVENT(dma_free_sgt,
+ TP_PROTO(struct device *dev, struct sg_table *sgt, size_t size,
+ enum dma_data_direction dir),
+ TP_ARGS(dev, sgt, size, dir),
+
+ TP_STRUCT__entry(
+ __string(device, dev_name(dev))
+ __dynamic_array(u64, phys_addrs, sgt->orig_nents)
+ __field(u64, dma_addr)
+ __field(size_t, size)
+ __field(enum dma_data_direction, dir)
+ ),
+
+ TP_fast_assign(
+ struct scatterlist *sg;
+ int i;
+
+ __assign_str(device);
+ for_each_sg(sgt->sgl, sg, sgt->orig_nents, i)
+ ((u64 *)__get_dynamic_array(phys_addrs))[i] = sg_phys(sg);
+ __entry->dma_addr = sg_dma_address(sgt->sgl);
+ __entry->size = size;
+ __entry->dir = dir;
+ ),
+
+ TP_printk("%s dir=%s dma_addr=%llx size=%zu phys_addrs=%s",
+ __get_str(device),
+ decode_dma_data_direction(__entry->dir),
+ __entry->dma_addr,
+ __entry->size,
+ __print_array(__get_dynamic_array(phys_addrs),
+ __get_dynamic_array_len(phys_addrs) /
+ sizeof(u64), sizeof(u64)))
+);
+
TRACE_EVENT(dma_map_sg,
TP_PROTO(struct device *dev, struct scatterlist *sgl, int nents,
int ents, enum dma_data_direction dir, unsigned long attrs),
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 944ac835030a..b8a6bc492fae 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -685,8 +685,8 @@ struct page *dma_alloc_pages(struct device *dev, size_t size,
struct page *page = __dma_alloc_pages(dev, size, dma_handle, dir, gfp);
if (page) {
- trace_dma_map_page(dev, page_to_phys(page), *dma_handle, size,
- dir, 0);
+ 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);
}
return page;
@@ -710,7 +710,7 @@ static void __dma_free_pages(struct device *dev, size_t size, struct page *page,
void dma_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
- trace_dma_unmap_page(dev, dma_handle, size, dir, 0);
+ trace_dma_free_pages(dev, page_to_virt(page), dma_handle, size, dir, 0);
debug_dma_unmap_page(dev, dma_handle, size, dir);
__dma_free_pages(dev, size, page, dma_handle, dir);
}
@@ -770,7 +770,7 @@ struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
if (sgt) {
sgt->nents = 1;
- trace_dma_map_sg(dev, sgt->sgl, sgt->orig_nents, 1, dir, attrs);
+ trace_dma_alloc_sgt(dev, sgt, size, dir, gfp, attrs);
debug_dma_map_sg(dev, sgt->sgl, sgt->orig_nents, 1, dir, attrs);
}
return sgt;
@@ -789,7 +789,7 @@ static void free_single_sgt(struct device *dev, size_t size,
void dma_free_noncontiguous(struct device *dev, size_t size,
struct sg_table *sgt, enum dma_data_direction dir)
{
- trace_dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir, 0);
+ trace_dma_free_sgt(dev, sgt, size, dir);
debug_dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir);
if (use_dma_iommu(dev))
--
2.35.1.1320.gc452695387.dirty
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