On 12/16/25 07:39, Xiang Gao wrote: > From: gaoxiang17 <[email protected]> > > Since we can only inspect dmabuf by iterating over process FDs or the > dmabuf_list, we need to add our own tracepoints to track its status in > real time in production. > > For example: > binder:3016_1-3102 [006] ...1. 255.126521: dma_buf_export: > exp_name=qcom,system size=12685312 ino=2738 > binder:3016_1-3102 [006] ...1. 255.126528: dma_buf_fd: > exp_name=qcom,system size=12685312 ino=2738 fd=8 > binder:3016_1-3102 [006] ...1. 255.126642: dma_buf_mmap_internal: > exp_name=qcom,system size=28672 ino=2739 > kworker/6:1-86 [006] ...1. 255.127194: dma_buf_put: > exp_name=qcom,system size=12685312 ino=2738 > RenderThread-9293 [006] ...1. 316.618179: dma_buf_get: > exp_name=qcom,system size=12771328 ino=2762 fd=176 > RenderThread-9293 [006] ...1. 316.618195: dma_buf_dynamic_attach: > exp_name=qcom,system size=12771328 ino=2762 attachment:ffffff880a18dd00 > is_dynamic=0 dev_name=kgsl-3d0 > RenderThread-9293 [006] ...1. 318.878220: dma_buf_detach: > exp_name=qcom,system size=12771328 ino=2762 attachment:ffffff880a18dd00 > is_dynamic=0 dev_name=kgsl-3d0 > > Signed-off-by: Xiang Gao <[email protected]>
Reviewed-by: Christian König <[email protected]> Going to push this to drm-misc-next today unless somebody has some last minute objections. Regards, Christian. > --- > drivers/dma-buf/dma-buf.c | 42 ++++++++- > include/trace/events/dma_buf.h | 154 +++++++++++++++++++++++++++++++++ > 2 files changed, 195 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..831973de76c4 100644 > --- a/drivers/dma-buf/dma-buf.c > +++ b/drivers/dma-buf/dma-buf.c > @@ -35,6 +35,25 @@ > > #include "dma-buf-sysfs-stats.h" > > +#define CREATE_TRACE_POINTS > +#include <trace/events/dma_buf.h> > + > +/* > + * dmabuf->name must be accessed with holding dmabuf->name_lock. > + * we need to take the lock around the tracepoint call itself where > + * it is called in the code. > + * > + * Note: FUNC##_enabled() is a static branch that will only > + * be set when the trace event is enabled. > + */ > +#define DMA_BUF_TRACE(FUNC, ...) \ > + do { \ > + if (FUNC##_enabled()) { \ > + guard(spinlock)(&dmabuf->name_lock); \ > + FUNC(__VA_ARGS__); \ > + } \ > + } while (0) > + > static inline int is_dma_buf_file(struct file *); > > static DEFINE_MUTEX(dmabuf_list_mutex); > @@ -220,6 +239,8 @@ static int dma_buf_mmap_internal(struct file *file, > struct vm_area_struct *vma) > dmabuf->size >> PAGE_SHIFT) > return -EINVAL; > > + DMA_BUF_TRACE(trace_dma_buf_mmap_internal, dmabuf); > + > return dmabuf->ops->mmap(dmabuf, vma); > } > > @@ -745,6 +766,8 @@ struct dma_buf *dma_buf_export(const struct > dma_buf_export_info *exp_info) > > __dma_buf_list_add(dmabuf); > > + DMA_BUF_TRACE(trace_dma_buf_export, dmabuf); > + > return dmabuf; > > err_dmabuf: > @@ -779,6 +802,8 @@ int dma_buf_fd(struct dma_buf *dmabuf, int flags) > > fd_install(fd, dmabuf->file); > > + DMA_BUF_TRACE(trace_dma_buf_fd, dmabuf, fd); > + > return fd; > } > EXPORT_SYMBOL_NS_GPL(dma_buf_fd, "DMA_BUF"); > @@ -794,6 +819,7 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_fd, "DMA_BUF"); > struct dma_buf *dma_buf_get(int fd) > { > struct file *file; > + struct dma_buf *dmabuf; > > file = fget(fd); > > @@ -805,7 +831,11 @@ struct dma_buf *dma_buf_get(int fd) > return ERR_PTR(-EINVAL); > } > > - return file->private_data; > + dmabuf = file->private_data; > + > + DMA_BUF_TRACE(trace_dma_buf_get, dmabuf, fd); > + > + return dmabuf; > } > EXPORT_SYMBOL_NS_GPL(dma_buf_get, "DMA_BUF"); > > @@ -825,6 +855,8 @@ void dma_buf_put(struct dma_buf *dmabuf) > return; > > fput(dmabuf->file); > + > + DMA_BUF_TRACE(trace_dma_buf_put, dmabuf); > } > EXPORT_SYMBOL_NS_GPL(dma_buf_put, "DMA_BUF"); > > @@ -979,6 +1011,9 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct > device *dev, > list_add(&attach->node, &dmabuf->attachments); > dma_resv_unlock(dmabuf->resv); > > + DMA_BUF_TRACE(trace_dma_buf_dynamic_attach, dmabuf, attach, > + dma_buf_attachment_is_dynamic(attach), dev); > + > return attach; > > err_attach: > @@ -1023,6 +1058,9 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct > dma_buf_attachment *attach) > if (dmabuf->ops->detach) > dmabuf->ops->detach(dmabuf, attach); > > + DMA_BUF_TRACE(trace_dma_buf_detach, dmabuf, attach, > + dma_buf_attachment_is_dynamic(attach), attach->dev); > + > kfree(attach); > } > EXPORT_SYMBOL_NS_GPL(dma_buf_detach, "DMA_BUF"); > @@ -1488,6 +1526,8 @@ int dma_buf_mmap(struct dma_buf *dmabuf, struct > vm_area_struct *vma, > vma_set_file(vma, dmabuf->file); > vma->vm_pgoff = pgoff; > > + DMA_BUF_TRACE(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..81ee4d05979c > --- /dev/null > +++ b/include/trace/events/dma_buf.h > @@ -0,0 +1,154 @@ > +/* 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> > + > +DECLARE_EVENT_CLASS(dma_buf, > + > + TP_PROTO(struct dma_buf *dmabuf), > + > + TP_ARGS(dmabuf), > + > + TP_STRUCT__entry( > + __string(exp_name, dmabuf->exp_name) > + __field(size_t, size) > + __field(ino_t, ino) > + ), > + > + TP_fast_assign( > + __assign_str(exp_name); > + __entry->size = dmabuf->size; > + __entry->ino = dmabuf->file->f_inode->i_ino; > + ), > + > + TP_printk("exp_name=%s size=%zu ino=%lu", > + __get_str(exp_name), > + __entry->size, > + __entry->ino) > +); > + > +DECLARE_EVENT_CLASS(dma_buf_attach_dev, > + > + TP_PROTO(struct dma_buf *dmabuf, struct dma_buf_attachment *attach, > bool is_dynamic, struct device *dev), > + > + TP_ARGS(dmabuf, attach, is_dynamic, dev), > + > + TP_STRUCT__entry( > + __string(dev_name, dev_name(dev)) > + __string(exp_name, dmabuf->exp_name) > + __field(size_t, size) > + __field(ino_t, ino) > + __field(struct dma_buf_attachment *, attach) > + __field(bool, is_dynamic) > + ), > + > + TP_fast_assign( > + __assign_str(dev_name); > + __assign_str(exp_name); > + __entry->size = dmabuf->size; > + __entry->ino = dmabuf->file->f_inode->i_ino; > + __entry->is_dynamic = is_dynamic; > + __entry->attach = attach; > + ), > + > + TP_printk("exp_name=%s size=%zu ino=%lu attachment:%p is_dynamic=%d > dev_name=%s", > + __get_str(exp_name), > + __entry->size, > + __entry->ino, > + __entry->attach, > + __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) > + __field(size_t, size) > + __field(ino_t, ino) > + __field(int, fd) > + ), > + > + TP_fast_assign( > + __assign_str(exp_name); > + __entry->size = dmabuf->size; > + __entry->ino = dmabuf->file->f_inode->i_ino; > + __entry->fd = fd; > + ), > + > + TP_printk("exp_name=%s size=%zu ino=%lu fd=%d", > + __get_str(exp_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, struct dma_buf_attachment *attach, > bool is_dynamic, struct device *dev), > + > + TP_ARGS(dmabuf, attach, is_dynamic, dev) > +); > + > +DEFINE_EVENT(dma_buf_attach_dev, dma_buf_detach, > + > + TP_PROTO(struct dma_buf *dmabuf, struct dma_buf_attachment *attach, > bool is_dynamic, struct device *dev), > + > + TP_ARGS(dmabuf, attach, 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 <trace/define_trace.h>
