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[68.147.0.187]) by smtp.gmail.com with ESMTPSA id h66sm3110587pgc.34.2021.12.10.09.22.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Dec 2021 09:22:23 -0800 (PST) Date: Fri, 10 Dec 2021 10:22:20 -0700 From: Mathieu Poirier To: James Clark Cc: Suzuki K Poulose , coresight@lists.linaro.org, Mike Leach , Leo Yan , John Garry , Will Deacon , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: Re: [PATCH 2/3] coresight: Fail to open with return stacks if they are unavailable Message-ID: <20211210172220.GA1238770@p14s> References: <20211208160907.749482-1-james.clark@arm.com> <20211208160907.749482-2-james.clark@arm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211210_092225_527642_ACB8DD8B X-CRM114-Status: GOOD ( 29.60 ) 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: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi James, On Thu, Dec 09, 2021 at 11:13:55AM +0000, James Clark wrote: > = > = > On 09/12/2021 11:00, Suzuki K Poulose wrote: > > On 08/12/2021 16:09, James Clark wrote: > >> Maintain consistency with the other options by failing to open when th= ey > >> aren't supported. For example ETM_OPT_TS, ETM_OPT_CTXTID2 and the newly > >> added ETM_OPT_BRANCH_BROADCAST all return with -EINVAL if they are > >> requested but not supported by hardware. > >> > >> The consequence of not doing this is that the user may not be > >> aware that they are not enabling the feature as it is silently disable= d. > >> > >> Signed-off-by: James Clark > >> --- > >> =A0 drivers/hwtracing/coresight/coresight-etm4x-core.c | 13 +++++++++-= --- > >> =A0 1 file changed, 9 insertions(+), 4 deletions(-) > >> > >> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/driv= ers/hwtracing/coresight/coresight-etm4x-core.c > >> index d2bafb50c66a..0a9bb943a5e5 100644 > >> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c > >> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c > >> @@ -674,10 +674,15 @@ static int etm4_parse_event_config(struct coresi= ght_device *csdev, > >> =A0=A0=A0=A0=A0 } > >> =A0 =A0=A0=A0=A0=A0 /* return stack - enable if selected and supported= */ > >> -=A0=A0=A0 if ((attr->config & BIT(ETM_OPT_RETSTK)) && drvdata->retsta= ck) > >> -=A0=A0=A0=A0=A0=A0=A0 /* bit[12], Return stack enable bit */ > >> -=A0=A0=A0=A0=A0=A0=A0 config->cfg |=3D BIT(12); > >> - > >> +=A0=A0=A0 if (attr->config & BIT(ETM_OPT_RETSTK)) { > >> +=A0=A0=A0=A0=A0=A0=A0 if (!drvdata->retstack) { > >> +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 ret =3D -EINVAL; > >> +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 goto out; > >> +=A0=A0=A0=A0=A0=A0=A0 } else { > >> +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 /* bit[12], Return stack enable bit= */ > >> +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 config->cfg |=3D BIT(12); > >> +=A0=A0=A0=A0=A0=A0=A0 } > > = > > nit: While at this, please could you change the hard coded value > > to ETM4_CFG_BIT_RETSTK ? > > = > I started changing them all because I had trouble searching for bits by n= ame but then > I thought it would snowball into a bigger change so I undid it. > = > I think I'll just go and do it now if it's an issue here. I can apply this set right away and you send another patch to fix all hard = coded bitfields or you can send another revision with all 4 patches included in it (bitfields fix plus these 3). Just let me know what you want to do. And n= ext time please add a cover letter. Thanks, Mathieu > = > > Otherwise, looks good to me > > = > > Suzuki _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel