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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7723f4858e6sm24285076b3a.4.2025.09.07.19.02.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 07 Sep 2025 19:02:45 -0700 (PDT) From: Jie Gan Date: Mon, 08 Sep 2025 10:01:56 +0800 Subject: [PATCH v6 4/9] coresight: tmc: add create/clean functions for etr_buf_list 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-v6-4-1db9e621441a@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=1757296940; l=4084; i=jie.gan@oss.qualcomm.com; s=20240927; h=from:subject:message-id; bh=9ZOyPv6bhMLRODUqaJ5ztJAwxo4d0yjUaaXYVxTCAts=; b=Ext6XQLN/vl2Miak4a6zi3Ok0V3h/UEyTz5zaNVhvOcLYXMtifEtk3eMxF/scd+Y50Uy8GxSf KSShG160avQD2blhk4TJzYjiKYrGLH/EM2PNXbqrQAafCaUfoSk3nWR X-Developer-Key: i=jie.gan@oss.qualcomm.com; a=ed25519; pk=OZh7JyRifqJh4xmrcGgmwa8/LCS8O11Q+mtx4aZGmi4= X-Proofpoint-ORIG-GUID: WX3IgAt_tvioqL1sw45XQx1OvEzWpsFB X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTA2MDAyNyBTYWx0ZWRfXwN7YFHnD3xx4 ii1NZQ6rQvrC8f3CWW5WPLqdCkmMR/B8BiErZgzqBX6q+8sGf0FxudvH7mnJz24EbBM9AgM02YY d9IO6HtrBjEo1m3/z+n7qIF2xRjj+jJKNm+/4hScYRQ8HVcZ2d21Z+3bmfqU7LGP2dLTbuAqAh6 HPOOmOB3rilTsStJFSg4EviqE1HyGQaBEBSQh99RUGynBs8AXnq8x9j9bMmRI3wKM7JNCX590AS Pkx7CdhS4VZiW77vIXI25ORHvNo7KpJeGf0BT4eS2PnENFZYBtFqv/soJh4PEBdpbq/OZHAmV4r A2pdN0Wp5Ebh9hnYTSyNF3HrGEuiw0+W9XDu2ihe7biqsd9h915VYbNIfLgWdyDzPGUa/1wwWAo wromBkhn X-Authority-Analysis: v=2.4 cv=cYXSrmDM c=1 sm=1 tr=0 ts=68be3947 cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=EUspDBNiAAAA:8 a=iCabL5HRm4xHoUrnq98A:9 a=QEXdDO2ut3YA:10 a=OpyuDcXvxspvyRM73sMx:22 X-Proofpoint-GUID: WX3IgAt_tvioqL1sw45XQx1OvEzWpsFB 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 bulkscore=0 adultscore=0 impostorscore=0 clxscore=1015 malwarescore=0 phishscore=0 spamscore=0 suspectscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2509060027 Create and insert or remove the etr_buf_node to/from the etr_buf_list. Signed-off-by: Jie Gan --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 94 +++++++++++++++++++++= ++++ drivers/hwtracing/coresight/coresight-tmc.h | 2 + 2 files changed, 96 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtr= acing/coresight/coresight-tmc-etr.c index b07fcdb3fe1a..ed15991b3217 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1909,6 +1909,100 @@ const struct coresight_ops tmc_etr_cs_ops =3D { .panic_ops =3D &tmc_etr_sync_ops, }; =20 +/** + * tmc_clean_etr_buf_list - clean the etr_buf_list. + * @drvdata: driver data of the TMC device. + * + * Remove the allocated node from the list and free the extra buffer. + */ +void tmc_clean_etr_buf_list(struct tmc_drvdata *drvdata) +{ + struct etr_buf_node *nd, *next; + + list_for_each_entry_safe(nd, next, &drvdata->etr_buf_list, node) { + if (nd->sysfs_buf =3D=3D drvdata->sysfs_buf) { + if (coresight_get_mode(drvdata->csdev) =3D=3D CS_MODE_DISABLED) { + drvdata->sysfs_buf =3D NULL; + tmc_free_etr_buf(nd->sysfs_buf); + nd->sysfs_buf =3D NULL; + } + list_del(&nd->node); + kfree(nd); + } else { + /* Free allocated buffers which are not utilized by ETR */ + list_del(&nd->node); + tmc_free_etr_buf(nd->sysfs_buf); + nd->sysfs_buf =3D NULL; + kfree(nd); + } + } +} +EXPORT_SYMBOL_GPL(tmc_clean_etr_buf_list); + +/** + * tmc_create_etr_buf_list - create a list to manage the etr_buf_node. + * @drvdata: driver data of the TMC device. + * @num_nodes: number of nodes want to create with the list. + * + * Return 0 upon success and return the error number if fail. + */ +int tmc_create_etr_buf_list(struct tmc_drvdata *drvdata, int num_nodes) +{ + struct etr_buf_node *new_node; + struct etr_buf *sysfs_buf; + int i =3D 0, ret =3D 0; + + /* We dont need a list if there is only one node */ + if (num_nodes < 2) + return -EINVAL; + + /* We expect that sysfs_buf in drvdata has already been allocated. */ + if (drvdata->sysfs_buf) { + /* Directly insert the allocated sysfs_buf into the list first */ + new_node =3D kzalloc(sizeof(struct etr_buf_node), GFP_KERNEL); + if (IS_ERR(new_node)) + return PTR_ERR(new_node); + + new_node->sysfs_buf =3D drvdata->sysfs_buf; + new_node->is_free =3D false; + list_add(&new_node->node, &drvdata->etr_buf_list); + i++; + } + + while (i < num_nodes) { + new_node =3D kzalloc(sizeof(struct etr_buf_node), GFP_KERNEL); + if (IS_ERR(new_node)) { + ret =3D PTR_ERR(new_node); + break; + } + + sysfs_buf =3D tmc_alloc_etr_buf(drvdata, drvdata->size, 0, cpu_to_node(0= ), NULL); + if (IS_ERR(sysfs_buf)) { + kfree(new_node); + ret =3D PTR_ERR(new_node); + break; + } + + /* We dont have a available sysfs_buf in drvdata, setup one */ + if (!drvdata->sysfs_buf) { + drvdata->sysfs_buf =3D sysfs_buf; + new_node->is_free =3D false; + } else + new_node->is_free =3D true; + + new_node->sysfs_buf =3D sysfs_buf; + list_add(&new_node->node, &drvdata->etr_buf_list); + i++; + } + + /* Clean the list if there is an error */ + if (ret) + tmc_clean_etr_buf_list(drvdata); + + return ret; +} +EXPORT_SYMBOL_GPL(tmc_create_etr_buf_list); + int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) { int ret =3D 0; diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracin= g/coresight/coresight-tmc.h index 292e25d82b62..ca0cba860d5f 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.h +++ b/drivers/hwtracing/coresight/coresight-tmc.h @@ -459,5 +459,7 @@ void tmc_etr_remove_catu_ops(void); struct etr_buf *tmc_etr_get_buffer(struct coresight_device *csdev, enum cs_mode mode, void *data); extern const struct attribute_group coresight_etr_group; +void tmc_clean_etr_buf_list(struct tmc_drvdata *drvdata); +int tmc_create_etr_buf_list(struct tmc_drvdata *drvdata, int num_nodes); =20 #endif --=20 2.34.1