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Message-Id: <20251125162949.220488-1-gxxa03070307@gmail.com>
Date: Wed, 26 Nov 2025 00:29:49 +0800
From: Xiang Gao <gxxa03070307@...il.com>
To: sumit.semwal@...aro.org,
christian.koenig@....com,
rostedt@...dmis.org,
mhiramat@...nel.org
Cc: linux-media@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
linaro-mm-sig@...ts.linaro.org,
linux-kernel@...r.kernel.org,
mathieu.desnoyers@...icios.com,
dhowells@...hat.com,
kuba@...nel.org,
brauner@...nel.org,
akpm@...ux-foundation.org,
linux-trace-kernel@...r.kernel.org,
gaoxiang17 <gaoxiang17@...omi.com>
Subject: [PATCH v2] dma-buf: add some tracepoints to debug.
From: gaoxiang17 <gaoxiang17@...omi.com>
I want to track the status of dmabuf in real time in the production environment.
But now we can only check it by traversing the fd in the process or dmabuf_list.
For example:
<...>-8342 [006] ..... 199.626433: dma_buf_export: exp_name=system name=(null) size=32768 ino=2337 f_refcnt=2
<...>-8342 [006] ..... 199.626436: dma_buf_fd: exp_name=system name=(null) size=32768 ino=2337 fd=853 f_refcnt=2
<...>-8342 [006] ..... 199.626472: dma_buf_mmap_internal: exp_name=system name=system size=32768 ino=2337 f_refcnt=6
<...>-3199 [006] ..... 200.719182: dma_buf_get: exp_name=qcom,system name=acb size=184320 ino=2331 fd=111 f_refcnt=6
<...>-894 [006] ..... 199.632342: dma_buf_put: exp_name=system name=system size=32768 ino=2337 f_refcnt=2
<...>-3199 [003] ..... 213.402200: dma_buf_attach: dev_name=soc:qcom,xxx exp_name=qcom,system name=acb size=184320 ino=2331 f_refcnt=7
<...>-1229 [004] ..... 213.850270: dma_buf_detach: exp_name=qcom,system name=acb size=184320 ino=2331 f_refcnt=6
Signed-off-by: Xiang Gao <gaoxiang17@...omi.com>
---
drivers/dma-buf/dma-buf.c | 19 +++
include/trace/events/dma_buf.h | 281 +++++++++++++++++++++++++++++++++
2 files changed, 300 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..ab593dea4617
--- /dev/null
+++ b/include/trace/events/dma_buf.h
@@ -0,0 +1,281 @@
+/* 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)
+ __field(long, f_refcnt)
+ ),
+
+ TP_fast_assign(
+ __assign_str(exp_name);
+ spin_lock(&dmabuf->name_lock);
+ __assign_str(name);
+ spin_unlock(&dmabuf->name_lock);
+ __entry->size = dmabuf->size;
+ __entry->ino = dmabuf->file->f_inode->i_ino;
+ __entry->f_refcnt = file_count(dmabuf->file);
+ ),
+
+ TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+ __get_str(exp_name),
+ __get_str(name),
+ __entry->size,
+ __entry->ino,
+ __entry->f_refcnt)
+);
+
+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)
+ __field(long, f_refcnt)
+ ),
+
+ TP_fast_assign(
+ __assign_str(exp_name);
+ spin_lock(&dmabuf->name_lock);
+ __assign_str(name);
+ spin_unlock(&dmabuf->name_lock);
+ __entry->size = dmabuf->size;
+ __entry->ino = dmabuf->file->f_inode->i_ino;
+ __entry->fd = fd;
+ __entry->f_refcnt = file_count(dmabuf->file);
+ ),
+
+ TP_printk("exp_name=%s name=%s size=%zu ino=%lu fd=%d f_refcnt=%ld",
+ __get_str(exp_name),
+ __get_str(name),
+ __entry->size,
+ __entry->ino,
+ __entry->fd,
+ __entry->f_refcnt)
+);
+
+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)
+ __field(long, f_refcnt)
+ ),
+
+ TP_fast_assign(
+ __assign_str(exp_name);
+ spin_lock(&dmabuf->name_lock);
+ __assign_str(name);
+ spin_unlock(&dmabuf->name_lock);
+ __entry->size = dmabuf->size;
+ __entry->ino = dmabuf->file->f_inode->i_ino;
+ __entry->f_refcnt = file_count(dmabuf->file);
+ ),
+
+ TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+ __get_str(exp_name),
+ __get_str(name),
+ __entry->size,
+ __entry->ino,
+ __entry->f_refcnt)
+);
+
+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)
+ __field(long, f_refcnt)
+ ),
+
+ TP_fast_assign(
+ __assign_str(exp_name);
+ spin_lock(&dmabuf->name_lock);
+ __assign_str(name);
+ spin_unlock(&dmabuf->name_lock);
+ __entry->size = dmabuf->size;
+ __entry->ino = dmabuf->file->f_inode->i_ino;
+ __entry->f_refcnt = file_count(dmabuf->file);
+ ),
+
+ TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+ __get_str(exp_name),
+ __get_str(name),
+ __entry->size,
+ __entry->ino,
+ __entry->f_refcnt)
+);
+
+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)
+ __field(long, f_refcnt)
+ ),
+
+ TP_fast_assign(
+ __assign_str(dname);
+ __assign_str(exp_name);
+ spin_lock(&dmabuf->name_lock);
+ __assign_str(name);
+ spin_unlock(&dmabuf->name_lock);
+ __entry->size = dmabuf->size;
+ __entry->ino = dmabuf->file->f_inode->i_ino;
+ __entry->f_refcnt = file_count(dmabuf->file);
+ ),
+
+ TP_printk("dev_name=%s exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+ __get_str(dname),
+ __get_str(exp_name),
+ __get_str(name),
+ __entry->size,
+ __entry->ino,
+ __entry->f_refcnt)
+);
+
+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)
+ __field(long, f_refcnt)
+ ),
+
+ TP_fast_assign(
+ __assign_str(exp_name);
+ spin_lock(&dmabuf->name_lock);
+ __assign_str(name);
+ spin_unlock(&dmabuf->name_lock);
+ __entry->size = dmabuf->size;
+ __entry->ino = dmabuf->file->f_inode->i_ino;
+ __entry->f_refcnt = file_count(dmabuf->file);
+ ),
+
+ TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+ __get_str(exp_name),
+ __get_str(name),
+ __entry->size,
+ __entry->ino,
+ __entry->f_refcnt)
+);
+
+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_refcnt)
+ ),
+
+ TP_fast_assign(
+ struct dma_buf *dmabuf = (struct dma_buf *)file->private_data;
+
+ __assign_str(exp_name);
+ spin_lock(&dmabuf->name_lock);
+ __assign_str(name);
+ spin_unlock(&dmabuf->name_lock);
+ __entry->size = dmabuf->size;
+ __entry->ino = dmabuf->file->f_inode->i_ino;
+ __entry->fd = fd;
+ __entry->f_refcnt = file_count(file);
+ ),
+
+ TP_printk("exp_name=%s name=%s size=%zu ino=%lu fd=%d f_refcnt=%ld",
+ __get_str(exp_name),
+ __get_str(name),
+ __entry->size,
+ __entry->ino,
+ __entry->fd,
+ __entry->f_refcnt)
+);
+
+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_refcnt)
+ ),
+
+ TP_fast_assign(
+ __assign_str(exp_name);
+ spin_lock(&dmabuf->name_lock);
+ __assign_str(name);
+ spin_unlock(&dmabuf->name_lock);
+ __entry->size = dmabuf->size;
+ __entry->ino = dmabuf->file->f_inode->i_ino;
+ __entry->f_refcnt = file_count(dmabuf->file);
+ ),
+
+ TP_printk("exp_name=%s name=%s size=%zu ino=%lu f_refcnt=%ld",
+ __get_str(exp_name),
+ __get_str(name),
+ __entry->size,
+ __entry->ino,
+ __entry->f_refcnt)
+);
+
+#endif /* _TRACE_DMA_BUF_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
--
2.34.1
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