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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7723f4858e6sm24285076b3a.4.2025.09.07.19.03.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 07 Sep 2025 19:03:05 -0700 (PDT) From: Jie Gan Date: Mon, 08 Sep 2025 10:02:00 +0800 Subject: [PATCH v6 8/9] coresight: tmc: integrate byte-cntr's read_ops with sysfs file_ops Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250908-enable-byte-cntr-for-tmc-v6-8-1db9e621441a@oss.qualcomm.com> References: <20250908-enable-byte-cntr-for-tmc-v6-0-1db9e621441a@oss.qualcomm.com> In-Reply-To: <20250908-enable-byte-cntr-for-tmc-v6-0-1db9e621441a@oss.qualcomm.com> To: Suzuki K Poulose , Mike Leach , James Clark , Alexander Shishkin , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Tingwei Zhang , Jinlong Mao , Bjorn Andersson , Konrad Dybcio Cc: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, Jie Gan X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1757296941; l=3612; i=jie.gan@oss.qualcomm.com; s=20240927; h=from:subject:message-id; bh=gqGZH6Yi8iA2PurHK4Hr0SugFLFi+Qumto7o2U0LAyM=; b=rkZkwzh3bZlNzouhvpi4j27HlwAMQmPx/lQCC/2XzkvPU+KvSz1Tf9dJhzWLdQbQgwzS8RzSQ JFhe9Q00/zZDLuuMF1J0EKQbLCrPjwFMOwBuv7RMFKBnbIl9o5gx67X X-Developer-Key: i=jie.gan@oss.qualcomm.com; a=ed25519; pk=OZh7JyRifqJh4xmrcGgmwa8/LCS8O11Q+mtx4aZGmi4= X-Proofpoint-ORIG-GUID: gMljxHu-6y5b1EsobljAtwHn_aYzpFNh X-Proofpoint-GUID: gMljxHu-6y5b1EsobljAtwHn_aYzpFNh X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTA2MDAxOCBTYWx0ZWRfX71OxLnpjSvHV pldxMpL14c39oWuBkQDfTOb6ug+1voJrEeS9eCgr5uk32RqjHcqiilZhFK+56kQzpDSdgMIfwrE RB3OXCXnjXREyMZMpRvrLua+5+0obRLyY9QSR982cDWgLBrDLWR6stu6Fbp7Zik1WZOWTM33spf qQaaYLuOJTUX+o0REzM047QMqWwcOCGJoGkg67z2om0nc+YF23020FUWWG5iQqWqObVU18JA2Wc EFBKU6eid8sUXvh2yIKwnfCdAc4INvT/PvuYr1lY0WZ+6BsAwjW1HDe+5rJzBn61iVVl2rHwX2r BtnZKCopR75he/u6FyVK74rUvUl1d2VKPEk/7xnAhcQURbc53Lx64vR9gowosSaVRb2BO2EwaB0 WECeCfsA X-Authority-Analysis: v=2.4 cv=G4kcE8k5 c=1 sm=1 tr=0 ts=68be395b cx=c_pps a=mDZGXZTwRPZaeRUbqKGCBw==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=EUspDBNiAAAA:8 a=i2GxayCjj04of9N-vEoA:9 a=+jEqtf1s3R9VXZ0wqowq2kgwd+I=:19 a=QEXdDO2ut3YA:10 a=zc0IvFSfCIW2DFIPzwfm:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-07_10,2025-09-04_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 bulkscore=0 suspectscore=0 clxscore=1015 malwarescore=0 adultscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2509060018 Add code logic to invoke byte-cntr's sysfs_read_ops if the byte-cntr is enabled. Signed-off-by: Jie Gan --- drivers/hwtracing/coresight/coresight-tmc-core.c | 53 ++++++++++++++++++++= +++- 1 file changed, 52 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwt= racing/coresight/coresight-tmc-core.c index ccb177d953b9..2895a9b431c3 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-core.c +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c @@ -31,6 +31,7 @@ =20 #include "coresight-priv.h" #include "coresight-tmc.h" +#include "coresight-ctcu.h" =20 DEFINE_CORESIGHT_DEVLIST(etb_devs, "tmc_etb"); DEFINE_CORESIGHT_DEVLIST(etf_devs, "tmc_etf"); @@ -228,15 +229,47 @@ static int tmc_prepare_crashdata(struct tmc_drvdata *= drvdata) return 0; } =20 +/* Return the byte-cntr's sysfs_read_ops if in use */ +static const struct sysfs_read_ops *tmc_get_byte_cntr_sysfs_ops(struct tmc= _drvdata *drvdata) +{ + struct ctcu_byte_cntr *byte_cntr_data; + struct ctcu_drvdata *ctcu_drvdata; + struct coresight_device *helper; + int port; + + helper =3D coresight_get_helper(drvdata->csdev, CORESIGHT_DEV_SUBTYPE_HEL= PER_CTCU); + if (!helper) + return NULL; + + port =3D coresight_get_in_port_dest(drvdata->csdev, helper); + if (port < 0) + return NULL; + + ctcu_drvdata =3D dev_get_drvdata(helper->dev.parent); + byte_cntr_data =3D &ctcu_drvdata->byte_cntr_data[port]; + if (byte_cntr_data && byte_cntr_data->thresh_val) + return ctcu_drvdata->byte_cntr_sysfs_read_ops; + + return NULL; +} + static int tmc_read_prepare(struct tmc_drvdata *drvdata) { + const struct sysfs_read_ops *byte_cntr_sysfs_read_ops; int ret =3D 0; =20 + byte_cntr_sysfs_read_ops =3D tmc_get_byte_cntr_sysfs_ops(drvdata); + if (byte_cntr_sysfs_read_ops) { + ret =3D byte_cntr_sysfs_read_ops->read_prepare(drvdata); + goto out; + } + if (drvdata->sysfs_ops) ret =3D drvdata->sysfs_ops->read_prepare(drvdata); else ret =3D -EINVAL; =20 +out: if (!ret) dev_dbg(&drvdata->csdev->dev, "TMC read start\n"); =20 @@ -245,13 +278,21 @@ static int tmc_read_prepare(struct tmc_drvdata *drvda= ta) =20 static int tmc_read_unprepare(struct tmc_drvdata *drvdata) { + const struct sysfs_read_ops *byte_cntr_sysfs_read_ops; int ret =3D 0; =20 + byte_cntr_sysfs_read_ops =3D tmc_get_byte_cntr_sysfs_ops(drvdata); + if (byte_cntr_sysfs_read_ops) { + ret =3D byte_cntr_sysfs_read_ops->read_unprepare(drvdata); + goto out; + } + if (drvdata->sysfs_ops) ret =3D drvdata->sysfs_ops->read_unprepare(drvdata); else ret =3D -EINVAL; =20 +out: if (!ret) dev_dbg(&drvdata->csdev->dev, "TMC read end\n"); =20 @@ -277,6 +318,12 @@ static int tmc_open(struct inode *inode, struct file *= file) static ssize_t tmc_get_sysfs_trace(struct tmc_drvdata *drvdata, loff_t pos= , size_t len, char **bufpp) { + const struct sysfs_read_ops *byte_cntr_sysfs_read_ops; + + byte_cntr_sysfs_read_ops =3D tmc_get_byte_cntr_sysfs_ops(drvdata); + if (byte_cntr_sysfs_read_ops) + return byte_cntr_sysfs_read_ops->get_trace_data(drvdata, pos, len, bufpp= ); + if (drvdata->sysfs_ops) return drvdata->sysfs_ops->get_trace_data(drvdata, pos, len, bufpp); =20 @@ -300,7 +347,11 @@ static ssize_t tmc_read(struct file *file, char __user= *data, size_t len, return -EFAULT; } =20 - *ppos +=3D actual; + if (drvdata->reading_node) + drvdata->reading_node->pos +=3D actual; + else + *ppos +=3D actual; + dev_dbg(&drvdata->csdev->dev, "%zu bytes copied\n", actual); =20 return actual; --=20 2.34.1