linux-kernel - [PATCH v6 4/4] coresight-tpda: Optimize the function of reading element size

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20241125130555.19924-5-quic_taozha@quicinc.com>
Date: Mon, 25 Nov 2024 21:05:55 +0800
From: Tao Zhang <quic_taozha@...cinc.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
	<mike.leach@...aro.org>, James Clark <james.clark@....com>,
        Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan
	<leo.yan@...ux.dev>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC: Tao Zhang <quic_taozha@...cinc.com>, <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>
Subject: [PATCH v6 4/4] coresight-tpda: Optimize the function of reading element size

Since the new funnel device supports multi-port output scenarios,
there may be more than one TPDM connected to one TPDA. In this
way, when reading the element size of the TPDM, TPDA driver needs
to find the expected TPDM corresponding to the filter source.
When TPDA finds a TPDM or a filter source from a input connection,
it will read the Devicetree to get the expected TPDM's element
size.

Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
---
 drivers/hwtracing/coresight/coresight-tpda.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
index ad023a2a99d1..413828f19d60 100644
--- a/drivers/hwtracing/coresight/coresight-tpda.c
+++ b/drivers/hwtracing/coresight/coresight-tpda.c
@@ -110,6 +110,16 @@ static int tpda_get_element_size(struct tpda_drvdata *drvdata,
 		    csdev->pdata->in_conns[i]->dest_port != inport)
 			continue;
 
+		/*
+		 * If this port has a hardcoded filter, use the source
+		 * device directly.
+		 */
+		if (csdev->pdata->in_conns[i]->filter_src_fwnode) {
+			in = csdev->pdata->in_conns[i]->filter_src_dev;
+			if (!in)
+				continue;
+		}
+
 		if (coresight_device_is_tpdm(in)) {
 			if (drvdata->dsb_esize || drvdata->cmb_esize)
 				return -EEXIST;
@@ -124,7 +134,6 @@ static int tpda_get_element_size(struct tpda_drvdata *drvdata,
 		}
 	}
 
-
 	return rc;
 }
 
-- 
2.17.1