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Mon, 12 Oct 2026 16:05:35 -0700 (PDT) Received: from localhost (2620:10d:c085:208::f) by mail.thefacebook.com (2620:10d:c08b:78::c78f) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.2.2562.49; Mon, 12 Oct 2026 23:05:34 +0000 From: Amir Ayupov To: James Clark , Leo Yan , Suzuki K Poulose , Mike Leach , Alexander Shishkin CC: Jonathan Corbet , Randy Dunlap , Shuah Khan , , , , Subject: [PATCH v2 2/4] coresight: syscfg: Match feature capabilities separately from device class Date: Mon, 12 Oct 2026 16:05:21 -0700 Message-ID: <20261012230527.750567-3-aaupov@fb.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20261012230527.750567-1-aaupov@fb.com> References: <20261012230527.750567-1-aaupov@fb.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [2620:10d:c085:208::f] X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDA5MSBTYWx0ZWRfX8TyiWm39SbKO MWmdUHnkeZEPQEoeLcsLn2jlt7wk0alJrRt0wwH2/KefvWUPVuZJkgxHS3RutQ+mmuw6P82SR7Q N2IX9exxRtLV3DbfZjUco6AMLrs6ObY= X-Proofpoint-GUID: pR0fbDFx4grSowKAFrFiG7P4etG6baAN X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDA5MSBTYWx0ZWRfX7q4EDHAIL8II xKkqnILXFiGTKxEZ4+5g8einZ0BPaP1gYmBwuL07WopidXJB+uoeZQsEYw3NM2+u7orHyoITkHa 75Z4L2QQScT7/Wjp4MoLRhaUbH2JfWVEgaCQR+Sj+C5uq+/JOlh45B22f7b6Z5IHDjDuWAQ50in AuFexDWFG1mTWRFP6LNE7edblIbkxV3p5RycpDTrTeN6LroE2vhvY6oZ69tOEnfSwFt2Put2a72 sfKqmSIgAemIGsvCQT5HOGPNpISfoMXUxv8SWWfCqG4PUnxeT/4GlkN4HBtbRuyCMhepYvx/H5N 1GlfN8RckYBVMh9/vLpfMAY+ZSW8BvI9whfO7fMsfC1XigN7oRZl/nf0RxMoMCdz8mxCq3CDydR 3ueJoYLKKSdbb0xHPpM6xJ9NbSKaD4xkUmFD1GU7yIed7qZhQ8k79nOhWMEEgzzzVqzFOfvS7i+ 4zAKhhjJT7gyISxGTyw== X-Proofpoint-ORIG-GUID: pR0fbDFx4grSowKAFrFiG7P4etG6baAN X-Authority-Analysis: v=2.4 cv=f7rdl+yM c=1 sm=1 tr=0 ts=6acd67bf cx=c_pps a=CB4LiSf2rd0gKozIdrpkBw==:117 a=CB4LiSf2rd0gKozIdrpkBw==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=7x6HtfJdh03M6CCDgxCd:22 a=03ozwUkBphtHgyqjj1sw:22 a=FOH2dFAWAAAA:8 a=RZ0xLGkQKdM_NVGOjToA:9 a=+jEqtf1s3R9VXZ0wqowq2kgwd+I=:19 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-10-12_06,2026-10-09_01,2025-10-01_01 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261012_160548_146181_01F533ED X-CRM114-Status: GOOD ( 18.29 ) 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 A feature loads on a device when the two share any match flag. That works for device classes, where a feature wants any one of them, but not for capabilities a device may or may not have: a feature that sets a class and a capability would still load on a device of that class without the capability. Reserve CS_CFG_MATCH_CAP_MASK for capability flags. A feature now loads on a device that shares one of its other flags and has all of its capabilities. Check this once in cscfg_load_feat_csdev(), which both the feature and the device registration paths call. No capability flags are defined yet, so matching is unchanged. Assisted-by: Devmate:Opus-5.5 Signed-off-by: Amir Ayupov --- .../hwtracing/coresight/coresight-config.h | 6 ++++ .../hwtracing/coresight/coresight-syscfg.c | 35 +++++++++++++------ 2 files changed, 31 insertions(+), 10 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-config.h b/drivers/hwtracing/coresight/coresight-config.h index 90fd937d3bd83..af6ef96b9ae01 100644 --- a/drivers/hwtracing/coresight/coresight-config.h +++ b/drivers/hwtracing/coresight/coresight-config.h @@ -30,6 +30,12 @@ #define CS_CFG_MATCH_CLASS_SRC_ALL 0x0001 /* match any source */ #define CS_CFG_MATCH_CLASS_SRC_ETM4 0x0002 /* match any ETMv4 device */ +/* + * flags defining device capabilities a feature can require. A feature loads on + * a device that matches one of its classes and has all of its capabilities. + */ +#define CS_CFG_MATCH_CAP_MASK 0x0000ff00 + /* flags defining device instance matching - used in config match desc data. */ #define CS_CFG_MATCH_INST_ANY 0x80000000 /* any instance of a class */ diff --git a/drivers/hwtracing/coresight/coresight-syscfg.c b/drivers/hwtracing/coresight/coresight-syscfg.c index a816c22c87bc8..1545d64afec01 100644 --- a/drivers/hwtracing/coresight/coresight-syscfg.c +++ b/drivers/hwtracing/coresight/coresight-syscfg.c @@ -172,7 +172,21 @@ cscfg_alloc_csdev_feat(struct coresight_device *csdev, struct cscfg_feature_desc } /* load one feature into one coresight device */ +/* + * A feature matches a device that shares one of its class flags and has all of + * the capability flags it requires. + */ +static bool cscfg_match_feat_csdev(u32 feat_flags, u32 csdev_flags) +{ + u32 caps = feat_flags & CS_CFG_MATCH_CAP_MASK; + + return (feat_flags & csdev_flags & ~CS_CFG_MATCH_CAP_MASK) && + (csdev_flags & caps) == caps; +} + +/* Load the feature into the device if it matches, otherwise skip it. */ static int cscfg_load_feat_csdev(struct coresight_device *csdev, + u32 match_flags, struct cscfg_feature_desc *feat_desc, struct cscfg_csdev_feat_ops *ops) { @@ -183,6 +197,9 @@ static int cscfg_load_feat_csdev(struct coresight_device *csdev, if (!ops->load_feat) return -EINVAL; + if (!cscfg_match_feat_csdev(feat_desc->match_flags, match_flags)) + return 0; + feat_csdev = cscfg_alloc_csdev_feat(csdev, feat_desc); if (!feat_csdev) return -ENOMEM; @@ -212,11 +229,11 @@ static int cscfg_add_feat_to_csdevs(struct cscfg_feature_desc *feat_desc) int err; list_for_each_entry(csdev_item, &cscfg_mgr->csdev_desc_list, item) { - if (csdev_item->match_flags & feat_desc->match_flags) { - err = cscfg_load_feat_csdev(csdev_item->csdev, feat_desc, &csdev_item->ops); - if (err) - return err; - } + err = cscfg_load_feat_csdev(csdev_item->csdev, + csdev_item->match_flags, feat_desc, + &csdev_item->ops); + if (err) + return err; } return 0; } @@ -739,11 +756,9 @@ static int cscfg_add_feats_csdev(struct coresight_device *csdev, return -EINVAL; list_for_each_entry(feat_desc, &cscfg_mgr->feat_desc_list, item) { - if (feat_desc->match_flags & match_flags) { - err = cscfg_load_feat_csdev(csdev, feat_desc, ops); - if (err) - break; - } + err = cscfg_load_feat_csdev(csdev, match_flags, feat_desc, ops); + if (err) + break; } return err; } -- 2.52.0