From nobody Sun Feb 8 14:34:42 2026 Received: from mail-pf1-f181.google.com (mail-pf1-f181.google.com [209.85.210.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A1FFD248F64 for ; Wed, 24 Dec 2025 01:35:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766540105; cv=none; b=eoinlYcVpJX9nr3IxJJcoU3ER7jlH4+pfXt60/+g4icAInsnZcKK2FJt0A6WmR1UBv/gticxaTKQkRNL6hzp9SkjLYmC1tu577R2dyBty+kzpOZPrmmX9fVC/l4W6FC5kqpKAitm2bPFlV5Tv20wN2YIGsxMekCb1T46Hw0q5XE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766540105; c=relaxed/simple; bh=Tv4vtw7Tbr+wgMrHd9/3cbmNcKI2RBnt+0OwiSlgBuU=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=H1+rzoziJW66xAzNh1e3YniOtbTNfnnANsQ5kzcQVyKTjmr9hrgh8nKfKslpMvGpYLxa5uPATpD8ZJDNuaxNLJOEGm/P5G6M6iI4hfZtgsYkJEa+q2UBnpXt+NNin0S0r16bT7ZtWh5wzcHSJDPkOJl/12taG5Y8YtUu/TrRjxg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=Ho5Df/GZ; arc=none smtp.client-ip=209.85.210.181 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="Ho5Df/GZ" Received: by mail-pf1-f181.google.com with SMTP id d2e1a72fcca58-7b80fed1505so5820655b3a.3 for ; Tue, 23 Dec 2025 17:35:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1766540103; x=1767144903; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=eLgDSVcqpjH9P0lPmmEO0GCItc6WAA5nc00aszWHtzk=; b=Ho5Df/GZZUCIZOrlM8/PQRX3Q0cZM3cUAcClf1msdbC5TWpwagfNaH/TtOsszo77mO BkS0Gfn3jRd8CpwHO70z3EBC3faoZvnf+CResrUQZzJnefZHwT1DooIXp0EyrqpY8lAz 081g4VguqQjrWh32HeyWFCO1OHbfKHFxHAwg76Q/06La/qcwoeuu9HpmKhPYhFUzFnq/ 5+ZGp5ipQKGyTCilTCkkFL651nQTY+15UT+zQWl2qq0+SH7lvOHmuMJZpLeZRUX0mlli imC81vEkwKhsjxHgEoJGwjNamJ1rEWITjovKUqtbl/9hkWavC+p6t1OWU2Hj6o8Vcbyz 1Hpg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766540103; x=1767144903; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=eLgDSVcqpjH9P0lPmmEO0GCItc6WAA5nc00aszWHtzk=; b=WtRQEbgMOblPWFZ7/O7cJ1o0kn/ftitoUbd9S/fXPXNc77sAZrkvXU1MLu+UaXMoIF n4yx0kk6va/e3C95RhKCM7xDI6oi8F/Fw184vJP1hh/zBtObwrcQgRJ7xfneg6/nZPKE QLP0Z/L4ks2kl6n0H5zG5PevbLCiase/tQzOXJsBZ4gzF2uz5qAuz0Td1jQ0HzepjRHP aAN3Mn3qN3KJxljIRegxx3gstqg4xmrEZCLLlFkS5medwbTvakRrI6VQAOItAE3dtRcU mzgFl46XeBGFbWGB8eiAR++iSDedoJ2Nyoz0sV+zhizjJJ31c81PDb+L6Sd5eUbAUCi9 3o6w== X-Forwarded-Encrypted: i=1; AJvYcCUrViWuL9v6imsC9n8pWvu3LhFY37DiRHCY9jMVdSU8pzsmcWM7RTS/QEDf7eqmzD0KJuxheHK9zDQMqhc=@vger.kernel.org X-Gm-Message-State: AOJu0YzFq5oGpujB6glEcoof/Wif8eCb0ppqSAvE9cXmmgE1caHHeE6G 7fYzTeLneMZaapTqzVdg0VOaLZe/htDOrqNu8sSeaXOE7V1sjz9cS2pV X-Gm-Gg: AY/fxX4RISGuwWUh4GKXH3XW0bTrSQIii7Iyu6viBxIL0d9xub3+HGxZoyMBZd30xzE hPO3PbVkApLJ3xcAaKXrLydkWPr9NQCqYdJr4F6T5YNQoTexlbwg/1DBQNERQab1PcljKG8sqXA /MdmQDC6n6ilutMB/2vFBq6lcl3snJeajQZwXPGwct8B7KVKQ6/1zdnb+y27doAt7iufSr4DyhC 5I+LphKqwyOCpBOfLtE//NIvxCfzsKjSl4VtObuxnlAT5lEtmizLqRUQ8RIp/U1Pb2wzC/f1SOd uiLXkibn4Lvtb99dx72R5plCGQ3qfj02+Y7jZ0Ada9BLCJHwyi9D8Ydk1BWur2g7RxQHywx6Cjl tFrFAcF4AI4Em08uwwOLh/ACCGIVA0mQtARdXjwGxtbEPZBuKe2cHDyUSXDJZ1aAr+f/jKwJFoA I5un+JbPUl7Djzko38Zu5/ X-Google-Smtp-Source: AGHT+IFTBuM3TfizJm1mOjlbks6r4SS68r/TDo9u052WC6bOg2K+nOmrc49Dnw3fRCDvPURsdk9ABQ== X-Received: by 2002:a05:6a20:9392:b0:366:14af:9bc2 with SMTP id adf61e73a8af0-376ab2e7a5dmr14766328637.76.1766540102836; Tue, 23 Dec 2025 17:35:02 -0800 (PST) Received: from xiao.mioffice.cn ([43.224.245.230]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7ff7e682870sm14956614b3a.57.2025.12.23.17.34.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Dec 2025 17:35:02 -0800 (PST) From: Xiang Gao To: sumit.semwal@linaro.org, christian.koenig@amd.com, rostedt@goodmis.org, mhiramat@kernel.org Cc: linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, dhowells@redhat.com, kuba@kernel.org, brauner@kernel.org, akpm@linux-foundation.org, linux-trace-kernel@vger.kernel.org, gaoxiang17 Subject: [PATCH v10] dma-buf: add some tracepoints to debug. Date: Wed, 24 Dec 2025 09:34:55 +0800 Message-Id: <20251224013455.1649879-1-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 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= =3Dqcom,system size=3D12685312 ino=3D2738 binder:3016_1-3102 [006] ...1. 255.126528: dma_buf_fd: exp_name=3Dq= com,system size=3D12685312 ino=3D2738 fd=3D8 binder:3016_1-3102 [006] ...1. 255.126642: dma_buf_mmap_internal: e= xp_name=3Dqcom,system size=3D28672 ino=3D2739 kworker/6:1-86 [006] ...1. 255.127194: dma_buf_put: exp_name=3D= qcom,system size=3D12685312 ino=3D2738 RenderThread-9293 [006] ...1. 316.618179: dma_buf_get: exp_name=3D= qcom,system size=3D12771328 ino=3D2762 fd=3D176 RenderThread-9293 [006] ...1. 316.618195: dma_buf_dynamic_attach: = exp_name=3Dqcom,system size=3D12771328 ino=3D2762 attachment:ffffff880a18dd= 00 is_dynamic=3D0 dev_name=3Dkgsl-3d0 RenderThread-9293 [006] ...1. 318.878220: dma_buf_detach: exp_name= =3Dqcom,system size=3D12771328 ino=3D2762 attachment:ffffff880a18dd00 is_dy= namic=3D0 dev_name=3Dkgsl-3d0 Signed-off-by: Xiang Gao --- drivers/dma-buf/dma-buf.c | 49 +++++++++- include/trace/events/dma_buf.h | 157 +++++++++++++++++++++++++++++++++ 2 files changed, 204 insertions(+), 2 deletions(-) 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 edaa9e4ee4ae..5e6f65cd0306 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -35,6 +35,26 @@ =20 #include "dma-buf-sysfs-stats.h" =20 +#define CREATE_TRACE_POINTS +#include + +/* + * 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 { \ + /* Always expose lock if lockdep is enabled */ \ + if (IS_ENABLED(CONFIG_LOCKDEP) || FUNC##_enabled()) { \ + guard(spinlock)(&dmabuf->name_lock); \ + FUNC(__VA_ARGS__); \ + } \ + } while (0) + static inline int is_dma_buf_file(struct file *); =20 static DEFINE_MUTEX(dmabuf_list_mutex); @@ -220,6 +240,8 @@ static int dma_buf_mmap_internal(struct file *file, str= uct vm_area_struct *vma) dmabuf->size >> PAGE_SHIFT) return -EINVAL; =20 + DMA_BUF_TRACE(trace_dma_buf_mmap_internal, dmabuf); + return dmabuf->ops->mmap(dmabuf, vma); } =20 @@ -745,6 +767,8 @@ struct dma_buf *dma_buf_export(const struct dma_buf_exp= ort_info *exp_info) =20 __dma_buf_list_add(dmabuf); =20 + DMA_BUF_TRACE(trace_dma_buf_export, dmabuf); + return dmabuf; =20 err_dmabuf: @@ -768,10 +792,16 @@ EXPORT_SYMBOL_NS_GPL(dma_buf_export, "DMA_BUF"); */ int dma_buf_fd(struct dma_buf *dmabuf, int flags) { + int fd; + if (!dmabuf || !dmabuf->file) return -EINVAL; =20 - return FD_ADD(flags, dmabuf->file); + fd =3D FD_ADD(flags, dmabuf->file); + if (fd >=3D 0) + DMA_BUF_TRACE(trace_dma_buf_fd, dmabuf, fd); + + return fd; } EXPORT_SYMBOL_NS_GPL(dma_buf_fd, "DMA_BUF"); =20 @@ -786,6 +816,7 @@ 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 @@ -797,7 +828,11 @@ struct dma_buf *dma_buf_get(int fd) return ERR_PTR(-EINVAL); } =20 - return file->private_data; + dmabuf =3D file->private_data; + + DMA_BUF_TRACE(trace_dma_buf_get, dmabuf, fd); + + return dmabuf; } EXPORT_SYMBOL_NS_GPL(dma_buf_get, "DMA_BUF"); =20 @@ -817,6 +852,8 @@ void dma_buf_put(struct dma_buf *dmabuf) return; =20 fput(dmabuf->file); + + DMA_BUF_TRACE(trace_dma_buf_put, dmabuf); } EXPORT_SYMBOL_NS_GPL(dma_buf_put, "DMA_BUF"); =20 @@ -971,6 +1008,9 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct = device *dev, list_add(&attach->node, &dmabuf->attachments); dma_resv_unlock(dmabuf->resv); =20 + DMA_BUF_TRACE(trace_dma_buf_dynamic_attach, dmabuf, attach, + dma_buf_attachment_is_dynamic(attach), dev); + return attach; =20 err_attach: @@ -1015,6 +1055,9 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dm= a_buf_attachment *attach) if (dmabuf->ops->detach) dmabuf->ops->detach(dmabuf, attach); =20 + 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"); @@ -1480,6 +1523,8 @@ 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 + 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..2c9ba8533467 --- /dev/null +++ b/include/trace/events/dma_buf.h @@ -0,0 +1,157 @@ +/* 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) + __field( size_t, size) + __field( ino_t, ino) + ), + + TP_fast_assign( + __assign_str(exp_name); + __entry->size =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + ), + + TP_printk("exp_name=3D%s size=3D%zu ino=3D%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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->is_dynamic =3D is_dynamic; + __entry->attach =3D attach; + ), + + TP_printk("exp_name=3D%s size=3D%zu ino=3D%lu attachment:%p is_dynamic=3D= %d dev_name=3D%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 =3D dmabuf->size; + __entry->ino =3D dmabuf->file->f_inode->i_ino; + __entry->fd =3D fd; + ), + + TP_printk("exp_name=3D%s size=3D%zu ino=3D%lu fd=3D%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 --=20 2.34.1