New subject: 答复: [External Mail]Re: [PATCH] dma-buf: add some tracepoints to debug.

24 Nov 2025

From: gaoxiang17 gaoxiang17@xiaomi.com
With these tracepoints, we can track dmabuf in real time.
For example:
   binder:3025_3-10524   [000] .....   553.310313: dma_buf_export: exp_name=qcom,system name=(null) size=12771328 ino=2799
   binder:3025_3-10524   [000] .....   553.310318: dma_buf_fd: exp_name=qcom,system name=(null) size=12771328 ino=2799 fd=8
    RenderThread-9307    [000] .....   553.310869: dma_buf_get: exp_name=qcom,system name=blastBufferQueue for scaleUpDow size=12771328 ino=2799 fd=673 f_ref=4
    RenderThread-9307    [000] .....   553.310871: dma_buf_attach: dev_name=kgsl-3d0 exp_name=qcom,system name=blastBufferQueue for scaleUpDow size=12771328 ino=2799
    RenderThread-9307    [000] .....   553.310946: dma_buf_mmap_internal: exp_name=qcom,system name=blastBufferQueue for scaleUpDow size=12771328 ino=2799
    RenderThread-9307    [004] .....   553.315084: dma_buf_detach: exp_name=qcom,system name=blastBufferQueue for scaleUpDow size=12771328 ino=2799
    RenderThread-9307    [004] .....   553.315084: dma_buf_put: exp_name=qcom,system name=blastBufferQueue for scaleUpDow size=12771328 ino=2799 f_ref=5
Signed-off-by: gaoxiang17 gaoxiang17@xiaomi.com
---
 drivers/dma-buf/dma-buf.c      |  19 +++
 include/trace/events/dma_buf.h | 245 +++++++++++++++++++++++++++++++++
 2 files changed, 264 insertions(+)
 create mode 100644 include/trace/events/dma_buf.h

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 2bcf9ceca997..8b5af73f0218 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -35,6 +35,9 @@
#include "dma-buf-sysfs-stats.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/dma_buf.h>
+
 static inline int is_dma_buf_file(struct file *);
static DEFINE_MUTEX(dmabuf_list_mutex);
@@ -220,6 +223,8 @@ static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma)
        dmabuf->size >> PAGE_SHIFT)
    	return -EINVAL;
+	trace_dma_buf_mmap_internal(dmabuf);
+
    return dmabuf->ops->mmap(dmabuf, vma);
 }
@@ -745,6 +750,8 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
__dma_buf_list_add(dmabuf);
+	trace_dma_buf_export(dmabuf);
+
    return dmabuf;
err_dmabuf:
@@ -779,6 +786,8 @@ int dma_buf_fd(struct dma_buf *dmabuf, int flags)
fd_install(fd, dmabuf->file);
+	trace_dma_buf_fd(dmabuf, fd);
+
    return fd;
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_fd, "DMA_BUF");
@@ -805,6 +814,8 @@ struct dma_buf *dma_buf_get(int fd)
    	return ERR_PTR(-EINVAL);
    }
+	trace_dma_buf_get(fd, file);
+
    return file->private_data;
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_get, "DMA_BUF");
@@ -825,6 +836,8 @@ void dma_buf_put(struct dma_buf *dmabuf)
    	return;
fput(dmabuf->file);
+
+	trace_dma_buf_put(dmabuf);
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_put, "DMA_BUF");
@@ -998,6 +1011,8 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_dynamic_attach, "DMA_BUF");
 struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
    				  struct device *dev)
 {
+	trace_dma_buf_attach(dmabuf, dev);
+
    return dma_buf_dynamic_attach(dmabuf, dev, NULL, NULL);
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_attach, "DMA_BUF");
@@ -1024,6 +1039,8 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
    	dmabuf->ops->detach(dmabuf, attach);
kfree(attach);
+
+	trace_dma_buf_detach(dmabuf);
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_detach, "DMA_BUF");
@@ -1488,6 +1505,8 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma,
    vma_set_file(vma, dmabuf->file);
    vma->vm_pgoff = pgoff;
+	trace_dma_buf_mmap(dmabuf);
+
    return dmabuf->ops->mmap(dmabuf, vma);
 }
 EXPORT_SYMBOL_NS_GPL(dma_buf_mmap, "DMA_BUF");
diff --git a/include/trace/events/dma_buf.h b/include/trace/events/dma_buf.h
new file mode 100644
index 000000000000..796ae444f6ae
--- /dev/null
+++ b/include/trace/events/dma_buf.h
@@ -0,0 +1,245 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM dma_buf
+
+#if !defined(_TRACE_DMA_BUF_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_DMA_BUF_H
+
+#include <linux/dma-buf.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(dma_buf_export,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		__assign_str(name);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino)
+);
+
+TRACE_EVENT(dma_buf_fd,
+
+	TP_PROTO(struct dma_buf *dmabuf, int fd),
+
+	TP_ARGS(dmabuf, fd),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(int, fd)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		__assign_str(name);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->fd = fd;
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu fd=%d",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->fd)
+);
+
+TRACE_EVENT(dma_buf_mmap_internal,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		__assign_str(name);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino)
+);
+
+TRACE_EVENT(dma_buf_mmap,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		__assign_str(name);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino)
+);
+
+TRACE_EVENT(dma_buf_attach,
+
+	TP_PROTO(struct dma_buf *dmabuf, struct device *dev),
+
+	TP_ARGS(dmabuf, dev),
+
+	TP_STRUCT__entry(
+		__string(dname, dev_name(dev))
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+	),
+
+	TP_fast_assign(
+		__assign_str(dname);
+		__assign_str(exp_name);
+		__assign_str(name);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+	),
+
+	TP_printk("dev_name=%s exp_name=%s name=%s size=%zu ino=%lu",
+		  __get_str(dname),
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino)
+);
+
+TRACE_EVENT(dma_buf_detach,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		__assign_str(name);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino)
+);
+
+TRACE_EVENT(dma_buf_get,
+
+	TP_PROTO(int fd, struct file *file),
+
+	TP_ARGS(fd, file),
+
+	TP_STRUCT__entry(
+		__string(exp_name, ((struct dma_buf *)file->private_data)->exp_name)
+		__string(name, ((struct dma_buf *)file->private_data)->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(int, fd)
+		__field(long, f_ref)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		__assign_str(name);
+		__entry->size = ((struct dma_buf *)file->private_data)->size;
+		__entry->ino = ((struct dma_buf *)file->private_data)->file->f_inode->i_ino;
+		__entry->fd = fd;
+		__entry->f_ref = file_ref_get(&file->f_ref);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu fd=%d f_ref=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->fd,
+		  __entry->f_ref)
+);
+
+TRACE_EVENT(dma_buf_put,
+
+	TP_PROTO(struct dma_buf *dmabuf),
+
+	TP_ARGS(dmabuf),
+
+	TP_STRUCT__entry(
+		__string(exp_name, dmabuf->exp_name)
+		__string(name, dmabuf->name)
+		__field(size_t, size)
+		__field(ino_t, ino)
+		__field(long, f_ref)
+	),
+
+	TP_fast_assign(
+		__assign_str(exp_name);
+		__assign_str(name);
+		__entry->size = dmabuf->size;
+		__entry->ino = dmabuf->file->f_inode->i_ino;
+		__entry->f_ref = file_ref_get(&dmabuf->file->f_ref);
+	),
+
+	TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_ref=%ld",
+		  __get_str(exp_name),
+		  __get_str(name),
+		  __entry->size,
+		  __entry->ino,
+		  __entry->f_ref)
+);
+
+#endif /* _TRACE_DMA_BUF_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
-- 
2.34.1


    