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Thu, 12 Oct 2023 11:08:15 GMT Received: from jinlmao-gv.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.36; Thu, 12 Oct 2023 04:08:12 -0700 From: Mao Jinlong To: Suzuki K Poulose , Mike Leach , James Clark , Leo Yan , Alexander Shishkin CC: Mao Jinlong , , , , , Tingwei Zhang , Yuanfang Zhang , Tao Zhang Subject: [PATCH] coresight-tmc-etr: Fix busy error when enable multiple sources Date: Thu, 12 Oct 2023 19:07:54 +0800 Message-ID: <20231012110754.32635-1-quic_jinlmao@quicinc.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: tfBzX98pawDRluVK1aJ1l0wIJdHA3E6Y X-Proofpoint-ORIG-GUID: tfBzX98pawDRluVK1aJ1l0wIJdHA3E6Y X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-12_05,2023-10-12_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 mlxscore=0 phishscore=0 lowpriorityscore=0 spamscore=0 clxscore=1011 mlxlogscore=485 suspectscore=0 priorityscore=1501 adultscore=0 malwarescore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310120090 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231012_040832_861785_761F5FCB X-CRM114-Status: GOOD ( 18.18 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In enable sink sysfs function, when etr is enabled, it doesn't need to call enable hw function again. [ 91.057233] ------------[ cut here ]------------ [ 91.061983] WARNING: CPU: 6 PID: 145 at drivers/hwtracing/coresight/coresight-tmc-etr.c:1038 tmc_etr_enable_hw+0xc4/0xd0 [ 91.073153] Modules linked in: [ 91.076302] CPU: 6 PID: 145 Comm: sh Tainted: G S W 6.5.0-rc3-g66d5eaa9e5a7 #111 [ 91.085149] Hardware name: Qualcomm Technologies, Inc. SM8450 QRD (DT) [ 91.091847] pstate: 634000c5 (nZCv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--) [ 91.099000] pc : tmc_etr_enable_hw+0xc4/0xd0 [ 91.103389] lr : tmc_enable_etr_sink+0x13c/0x294 [ 91.108130] sp : ffff8000815cbb30 [ 91.111537] x29: ffff8000815cbb30 x28: ffff68ce4352a800 x27: 0000000000000000 [ 91.118868] x26: ffff68ce414cc040 x25: ffff68ce414a82e0 x24: 0000000000000000 [ 91.126199] x23: ffff68ce423a1ee0 x22: ffff68ce423a1e80 x21: ffff68ce4352a800 [ 91.133527] x20: 0000000000000001 x19: ffff68ce414aa500 x18: fffffda31cf9c008 [ 91.140857] x17: 0000000000000040 x16: 0000000000000001 x15: fffffc0000000000 [ 91.148188] x14: 00000000f0000080 x13: 0000000000000000 x12: ffff9739c0000000 [ 91.155516] x11: ffffbe9cdf71e400 x10: 0000000000001000 x9 : ffff68d0b29e3b28 [ 91.162845] x8 : fffffda31cf983c8 x7 : fffffda31cf98388 x6 : 00000000ffffffd0 [ 91.170174] x5 : ffff68ce435d8ec0 x4 : ffff68d0b29e2610 x3 : ffff68ce435d8ec0 [ 91.177502] x2 : ffff68ce414aa500 x1 : ffff68ce414aa500 x0 : ffff68ce423a1e80 [ 91.184833] Call trace: [ 91.187349] tmc_etr_enable_hw+0xc4/0xd0 [ 91.191388] tmc_enable_etr_sink+0x13c/0x294 [ 91.195777] coresight_enable_path+0x21c/0x24c [ 91.200347] coresight_enable+0x9c/0x204 [ 91.204379] enable_source_store+0x58/0xa0 [ 91.208595] dev_attr_store+0x18/0x2c [ 91.212361] sysfs_kf_write+0x40/0x54 [ 91.216126] kernfs_fop_write_iter+0x164/0x1dc [ 91.220692] vfs_write+0x3a8/0x460 [ 91.224191] ksys_write+0x6c/0x100 [ 91.227690] __arm64_sys_write+0x1c/0x28 [ 91.231728] invoke_syscall+0x44/0x100 [ 91.235586] el0_svc_common.constprop.1+0x6c/0xe4 [ 91.240418] do_el0_svc+0x38/0x94 [ 91.243833] el0_svc+0x28/0x74 [ 91.246981] el0t_64_sync_handler+0xa0/0xc4 [ 91.251282] el0t_64_sync+0x174/0x178 [ 91.255045] ---[ end trace 0000000000000000 ]--- sh: write error: Device or resource busy Signed-off-by: Mao Jinlong --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 66dc5f97a009..e1c7bae9f6ee 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1204,7 +1204,7 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev) static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) { - int ret; + int ret = 0; unsigned long flags; struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); struct etr_buf *sysfs_buf = tmc_etr_get_sysfs_buffer(csdev); @@ -1213,12 +1213,16 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev) return PTR_ERR(sysfs_buf); spin_lock_irqsave(&drvdata->spinlock, flags); + if (drvdata->mode == CS_MODE_SYSFS) + goto out; + ret = tmc_etr_enable_hw(drvdata, sysfs_buf); if (!ret) { drvdata->mode = CS_MODE_SYSFS; atomic_inc(&csdev->refcnt); } +out: spin_unlock_irqrestore(&drvdata->spinlock, flags); if (!ret)