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Date: Fri, 28 Nov 2025 16:52:15 +0800 Message-Id: <20251128085215.550100-1-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:3031_4-18348 [005] ...1. 545.568275: dma_buf_export: exp_name= =3Dqcom,system name=3D(null) size=3D217088 ino=3D2750 binder:3031_4-18348 [005] ...1. 545.568284: dma_buf_fd: exp_name=3Dq= com,system name=3D(null) size=3D217088 ino=3D2750 fd=3D8 binder:3031_4-18348 [005] ...1. 545.568399: dma_buf_mmap_internal: e= xp_name=3Dqcom,system name=3Dqcom,system size=3D28672 ino=3D2751 kworker/5:1-130 [005] ...1. 545.570193: dma_buf_put: exp_name=3D= qcom,system name=3Dab size=3D28672 ino=3D2751 RenderThread-18891 [005] ...1. 545.602994: dma_buf_get: exp_name=3D= qcom,system name=3Dab size=3D217088 ino=3D2750 fd=3D1087 RenderThread-9409 [000] .n.1. 545.745004: dma_buf_dynamic_attach: = exp_name=3Dqcom,system name=3Dab size=3D217088 ino=3D2750 is_dynamic=3D0 de= v_name=3Dkgsl-3d0 RenderThread-9409 [005] ...1. 545.747802: dma_buf_detach: exp_name= =3Dqcom,system name=3Dbq size=3D12771328 ino=3D2764 is_dynamic=3D0 dev_name= =3Dkgsl-3d0 Signed-off-by: Xiang Gao --- drivers/dma-buf/dma-buf.c | 48 +++++++++- include/trace/events/dma_buf.h | 160 +++++++++++++++++++++++++++++++++ 2 files changed, 207 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..6e04e12f149e 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 +223,11 @@ 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 +753,11 @@ 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 +792,11 @@ 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 +812,7 @@ 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 +824,14 @@ 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 +851,11 @@ 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 @@ -979,6 +1010,11 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct= device *dev, list_add(&attach->node, &dmabuf->attachments); dma_resv_unlock(dmabuf->resv); =20 + if (trace_dma_buf_dynamic_attach_enabled()) { + guard(spinlock)(&dmabuf->name_lock); + trace_dma_buf_dynamic_attach(dmabuf, dma_buf_attachment_is_dynamic(attac= h), dev); + } + return attach; =20 err_attach: @@ -1023,6 +1059,11 @@ 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, dma_buf_attachment_is_dynamic(attach), atta= ch->dev); + } + kfree(attach); } EXPORT_SYMBOL_NS_GPL(dma_buf_detach, "DMA_BUF"); @@ -1488,6 +1529,11 @@ 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..f4b6ba5241fa --- /dev/null +++ b/include/trace/events/dma_buf.h @@ -0,0 +1,160 @@ +/* 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) + ), + + TP_fast_assign( + __assign_str(exp_name); + __assign_str(name); + __entry->size =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu", + __get_str(exp_name), + __get_str(name), + __entry->size, + __entry->ino) +); + +DECLARE_EVENT_CLASS(dma_buf_attach_dev, + + TP_PROTO(struct dma_buf *dmabuf, bool is_dynamic, struct device *dev), + + TP_ARGS(dmabuf, is_dynamic, dev), + + TP_STRUCT__entry( + __string(dev_name, dev_name(dev)) + __string(exp_name, dmabuf->exp_name) + __string(name, dmabuf->name) + __field(size_t, size) + __field(ino_t, ino) + __field(bool, is_dynamic) + ), + + TP_fast_assign( + __assign_str(dev_name); + __assign_str(exp_name); + __assign_str(name); + __entry->size =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->is_dynamic =3D is_dynamic; + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu is_dynamic=3D%d d= ev_name=3D%s", + __get_str(exp_name), + __get_str(name), + __entry->size, + __entry->ino, + __entry->is_dynamic, + __get_str(dev_name)) +); + +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) + ), + + 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; + ), + + TP_printk("exp_name=3D%s name=3D%s size=3D%zu ino=3D%lu fd=3D%d", + __get_str(exp_name), + __get_str(name), + __entry->size, + __entry->ino, + __entry->fd) +); + +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_dynamic_attach, + + TP_PROTO(struct dma_buf *dmabuf, bool is_dynamic, struct device *dev), + + TP_ARGS(dmabuf, is_dynamic, dev) +); + +DEFINE_EVENT(dma_buf_attach_dev, dma_buf_detach, + + TP_PROTO(struct dma_buf *dmabuf, bool is_dynamic, struct device *dev), + + TP_ARGS(dmabuf, is_dynamic, 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