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Date: Thu, 27 Nov 2025 08:43:52 +0800 Message-Id: <20251127004352.376307-1-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. But now we can only check it by traversing the fd in the process or dmabuf_= list. For example: binder:2962_2-2962 [005] ...1. 208.453940: dma_buf_export: exp_name= =3Dqcom,system name=3D(null) size=3D28672 ino=3D2580 f_refcnt=3D2 binder:2962_2-2962 [005] ...1. 208.453943: dma_buf_fd: exp_name=3Dq= com,system name=3D(null) size=3D28672 ino=3D2580 fd=3D9 f_refcnt=3D2 binder:2962_2-2962 [005] ...1. 208.453977: dma_buf_mmap_internal: e= xp_name=3Dqcom,system name=3Dqcom,system size=3D28672 ino=3D2580 f_refcnt= =3D4 kworker/5:2-194 [005] ...1. 208.460580: dma_buf_put: exp_name=3D= qcom,system name=3Dab pid [8176] size=3D28672 ino=3D2580 f_refcnt=3D3 RenderThread-11305 [007] ...1. 208.599094: dma_buf_get: exp_name=3D= qcom,system name=3Dab pid [8176] size=3D217088 ino=3D2579 fd=3D1114 f_refcn= t=3D7 RenderThread-11305 [007] ...1. 208.599098: dma_buf_attach: dev_name= =3Dkgsl-3d0 exp_name=3Dqcom,system name=3Dab pid [8176] size=3D217088 ino= =3D2579 f_refcnt=3D7 <...>-14 [001] ...1. 208.726359: dma_buf_detach: dev_name= =3Dkgsl-3d0 exp_name=3Dqcom,system name=3Dab pid [3317] size=3D217088 ino= =3D2581 f_refcnt=3D3 Signed-off-by: Xiang Gao --- drivers/dma-buf/dma-buf.c | 57 ++++++++++- include/trace/events/dma_buf.h | 166 +++++++++++++++++++++++++++++++++ 2 files changed, 222 insertions(+), 1 deletion(-) 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..7cef816ddcac 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -35,6 +35,18 @@ =20 #include "dma-buf-sysfs-stats.h" =20 +#define CREATE_TRACE_POINTS +#include + +EXPORT_TRACEPOINT_SYMBOL(dma_buf_export); +EXPORT_TRACEPOINT_SYMBOL(dma_buf_mmap_internal); +EXPORT_TRACEPOINT_SYMBOL(dma_buf_mmap); +EXPORT_TRACEPOINT_SYMBOL(dma_buf_put); +EXPORT_TRACEPOINT_SYMBOL(dma_buf_attach); +EXPORT_TRACEPOINT_SYMBOL(dma_buf_detach); +EXPORT_TRACEPOINT_SYMBOL(dma_buf_fd); +EXPORT_TRACEPOINT_SYMBOL(dma_buf_get); + static inline int is_dma_buf_file(struct file *); =20 static DEFINE_MUTEX(dmabuf_list_mutex); @@ -220,6 +232,11 @@ static int dma_buf_mmap_internal(struct file *file, st= ruct vm_area_struct *vma) dmabuf->size >> PAGE_SHIFT) return -EINVAL; =20 + if (trace_dma_buf_mmap_internal_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + trace_dma_buf_mmap_internal(dmabuf); + } + return dmabuf->ops->mmap(dmabuf, vma); } =20 @@ -745,6 +762,11 @@ struct dma_buf *dma_buf_export(const struct dma_buf_ex= port_info *exp_info) =20 __dma_buf_list_add(dmabuf); =20 + if (trace_dma_buf_export_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + trace_dma_buf_export(dmabuf); + } + return dmabuf; =20 err_dmabuf: @@ -779,6 +801,11 @@ int dma_buf_fd(struct dma_buf *dmabuf, int flags) =20 fd_install(fd, dmabuf->file); =20 + if (trace_dma_buf_fd_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + trace_dma_buf_fd(dmabuf, fd); + } + return fd; } EXPORT_SYMBOL_NS_GPL(dma_buf_fd, "DMA_BUF"); @@ -794,6 +821,7 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_fd, "DMA_BUF"); struct dma_buf *dma_buf_get(int fd) { struct file *file; + struct dma_buf *dmabuf; =20 file =3D fget(fd); =20 @@ -805,7 +833,14 @@ struct dma_buf *dma_buf_get(int fd) return ERR_PTR(-EINVAL); } =20 - return file->private_data; + dmabuf =3D file->private_data; + + if (trace_dma_buf_get_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + trace_dma_buf_get(dmabuf, fd); + } + + return dmabuf; } EXPORT_SYMBOL_NS_GPL(dma_buf_get, "DMA_BUF"); =20 @@ -825,6 +860,11 @@ void dma_buf_put(struct dma_buf *dmabuf) return; =20 fput(dmabuf->file); + + if (trace_dma_buf_put_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + trace_dma_buf_put(dmabuf); + } } EXPORT_SYMBOL_NS_GPL(dma_buf_put, "DMA_BUF"); =20 @@ -998,6 +1038,11 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_dynamic_attach, "DMA_BUF= "); struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, struct device *dev) { + if (trace_dma_buf_attach_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + trace_dma_buf_attach(dmabuf, dev); + } + return dma_buf_dynamic_attach(dmabuf, dev, NULL, NULL); } EXPORT_SYMBOL_NS_GPL(dma_buf_attach, "DMA_BUF"); @@ -1023,6 +1068,11 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct d= ma_buf_attachment *attach) if (dmabuf->ops->detach) dmabuf->ops->detach(dmabuf, attach); =20 + if (trace_dma_buf_detach_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + trace_dma_buf_detach(dmabuf, attach->dev); + } + kfree(attach); } EXPORT_SYMBOL_NS_GPL(dma_buf_detach, "DMA_BUF"); @@ -1488,6 +1538,11 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_a= rea_struct *vma, vma_set_file(vma, dmabuf->file); vma->vm_pgoff =3D pgoff; =20 + if (trace_dma_buf_mmap_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + 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..fe9da89bacd0 --- /dev/null +++ b/include/trace/events/dma_buf.h @@ -0,0 +1,166 @@ +/* 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 + +DECLARE_EVENT_CLASS(dma_buf, + + 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); + __assign_str(name); + __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) +); + +DECLARE_EVENT_CLASS(dma_buf_attach_dev, + + 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); + __assign_str(name); + __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) +); + +DECLARE_EVENT_CLASS(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); + __assign_str(name); + __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) +); + +DEFINE_EVENT(dma_buf, dma_buf_export, + + TP_PROTO(struct dma_buf *dmabuf), + + TP_ARGS(dmabuf) +); + +DEFINE_EVENT(dma_buf, dma_buf_mmap_internal, + + TP_PROTO(struct dma_buf *dmabuf), + + TP_ARGS(dmabuf) +); + +DEFINE_EVENT(dma_buf, dma_buf_mmap, + + TP_PROTO(struct dma_buf *dmabuf), + + TP_ARGS(dmabuf) +); + +DEFINE_EVENT(dma_buf, dma_buf_put, + + TP_PROTO(struct dma_buf *dmabuf), + + TP_ARGS(dmabuf) +); + +DEFINE_EVENT(dma_buf_attach_dev, dma_buf_attach, + + TP_PROTO(struct dma_buf *dmabuf, struct device *dev), + + TP_ARGS(dmabuf, dev) +); + +DEFINE_EVENT(dma_buf_attach_dev, dma_buf_detach, + + TP_PROTO(struct dma_buf *dmabuf, struct device *dev), + + TP_ARGS(dmabuf, dev) +); + +DEFINE_EVENT(dma_buf_fd, dma_buf_fd, + + TP_PROTO(struct dma_buf *dmabuf, int fd), + + TP_ARGS(dmabuf, fd) +); + +DEFINE_EVENT(dma_buf_fd, dma_buf_get, + + TP_PROTO(struct dma_buf *dmabuf, int fd), + + TP_ARGS(dmabuf, fd) +); + +#endif /* _TRACE_DMA_BUF_H */ + +/* This part must be outside protection */ +#include --=20 2.34.1