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Date: Wed, 26 Nov 2025 00:29:49 +0800 Message-Id: <20251125162949.220488-1-gxxa03070307@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: gaoxiang17 I want to track the status of dmabuf in real time in the production environ= ment.=20 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=3Dsyst= em name=3D(null) size=3D32768 ino=3D2337 f_refcnt=3D2 <...>-8342 [006] ..... 199.626436: dma_buf_fd: exp_name=3Dsystem n= ame=3D(null) size=3D32768 ino=3D2337 fd=3D853 f_refcnt=3D2 <...>-8342 [006] ..... 199.626472: dma_buf_mmap_internal: exp_name= =3Dsystem name=3Dsystem size=3D32768 ino=3D2337 f_refcnt=3D6 <...>-3199 [006] ..... 200.719182: dma_buf_get: exp_name=3Dqcom,sy= stem name=3Dacb size=3D184320 ino=3D2331 fd=3D111 f_refcnt=3D6 <...>-894 [006] ..... 199.632342: dma_buf_put: exp_name=3Dsystem = name=3Dsystem size=3D32768 ino=3D2337 f_refcnt=3D2 <...>-3199 [003] ..... 213.402200: dma_buf_attach: dev_name=3Dsoc:= qcom,xxx exp_name=3Dqcom,system name=3Dacb size=3D184320 ino=3D2331 f_refcn= t=3D7 <...>-1229 [004] ..... 213.850270: dma_buf_detach: exp_name=3Dqcom= ,system name=3Dacb size=3D184320 ino=3D2331 f_refcnt=3D6 Signed-off-by: Xiang Gao --- 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 @@ =20 #include "dma-buf-sysfs-stats.h" =20 +#define CREATE_TRACE_POINTS +#include + static inline int is_dma_buf_file(struct file *); =20 static DEFINE_MUTEX(dmabuf_list_mutex); @@ -220,6 +223,8 @@ static int dma_buf_mmap_internal(struct file *file, str= uct vm_area_struct *vma) dmabuf->size >> PAGE_SHIFT) return -EINVAL; =20 + trace_dma_buf_mmap_internal(dmabuf); + return dmabuf->ops->mmap(dmabuf, vma); } =20 @@ -745,6 +750,8 @@ struct dma_buf *dma_buf_export(const struct dma_buf_exp= ort_info *exp_info) =20 __dma_buf_list_add(dmabuf); =20 + trace_dma_buf_export(dmabuf); + return dmabuf; =20 err_dmabuf: @@ -779,6 +786,8 @@ int dma_buf_fd(struct dma_buf *dmabuf, int flags) =20 fd_install(fd, dmabuf->file); =20 + 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); } =20 + 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; =20 fput(dmabuf->file); + + trace_dma_buf_put(dmabuf); } EXPORT_SYMBOL_NS_GPL(dma_buf_put, "DMA_BUF"); =20 @@ -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 dm= a_buf_attachment *attach) dmabuf->ops->detach(dmabuf, attach); =20 kfree(attach); + + trace_dma_buf_detach(dmabuf); } EXPORT_SYMBOL_NS_GPL(dma_buf_detach, "DMA_BUF"); =20 @@ -1488,6 +1505,8 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_ar= ea_struct *vma, vma_set_file(vma, dmabuf->file); vma->vm_pgoff =3D pgoff; =20 + 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 +#include + +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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->f_refcnt =3D file_count(dmabuf->file); + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu f_refcnt=3D%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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->fd =3D fd; + __entry->f_refcnt =3D file_count(dmabuf->file); + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu fd=3D%d f_refcnt= =3D%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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->f_refcnt =3D file_count(dmabuf->file); + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu f_refcnt=3D%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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->f_refcnt =3D file_count(dmabuf->file); + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu f_refcnt=3D%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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->f_refcnt =3D file_count(dmabuf->file); + ), + + TP_printk("dev_name=3D%s exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu f_r= efcnt=3D%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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->f_refcnt =3D file_count(dmabuf->file); + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu f_refcnt=3D%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 =3D (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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->fd =3D fd; + __entry->f_refcnt =3D file_count(file); + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu fd=3D%d f_refcnt= =3D%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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->f_refcnt =3D file_count(dmabuf->file); + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu f_refcnt=3D%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 --=20 2.34.1