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Tue, 13 May 2025 15:03:56 -0700 (PDT) Received: from [192.168.1.14] ([38.175.170.29]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4fa224d8d13sm2302262173.31.2025.05.13.15.03.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 May 2025 15:03:55 -0700 (PDT) Message-ID: <09c7ad5e-4061-4c0b-b097-fa575c12a244@linuxfoundation.org> Date: Tue, 13 May 2025 16:03:55 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] tools/powercap: Implement powercap_set_enabled() To: Suchit Karunakaran , trenn@suse.com, shuah@kernel.org, jwyatt@redhat.com, jkacur@redhat.com, linux-pm@vger.kernel.org Cc: linux-kernel-mentees@lists.linux.dev, linux-kernel@vger.kernel.org, Shuah Khan References: <20250510184709.44935-1-suchitkarunakaran@gmail.com> Content-Language: en-US From: Shuah Khan In-Reply-To: <20250510184709.44935-1-suchitkarunakaran@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 5/10/25 12:47, Suchit Karunakaran wrote: > The powercap_set_enabled() function previously returned a dummy value > and was marked with a TODO comment. This patch implements the function > by writing the desired mode (0 or 1) to /sys/class/powercap/intel-rapl/enabled The short summary should say cpupower: Implement powercap_set_enabled() > > Signed-off-by: Suchit Karunakaran > --- > tools/power/cpupower/lib/powercap.c | 22 ++++++++++++++++++---- > 1 file changed, 18 insertions(+), 4 deletions(-) > > diff --git a/tools/power/cpupower/lib/powercap.c b/tools/power/cpupower/lib/powercap.c > index 94a0c69e55ef..7947b9809239 100644 > --- a/tools/power/cpupower/lib/powercap.c > +++ b/tools/power/cpupower/lib/powercap.c > @@ -70,6 +70,22 @@ static int sysfs_get_enabled(char *path, int *mode) > return ret; > } > > +static int sysfs_set_enabled(const char *path, int mode) > +{ > + int fd; > + char buf[2] = { mode ? '1' : '0', '\n' }; > + ssize_t ret; > + > + fd = open(path, O_WRONLY); > + if (fd == -1) > + return -1; > + > + ret = write(fd, buf, sizeof(buf)); > + close(fd); > + > + return ret == sizeof(buf) ? 0 : -1; > +} > + > int powercap_get_enabled(int *mode) > { > char path[SYSFS_PATH_MAX] = PATH_TO_POWERCAP "/intel-rapl/enabled"; > @@ -77,12 +93,10 @@ int powercap_get_enabled(int *mode) > return sysfs_get_enabled(path, mode); > } > > -/* > - * TODO: implement function. Returns dummy 0 for now. > - */ > int powercap_set_enabled(int mode) > { > - return 0; > + char path[SYSFS_PATH_MAX] = PATH_TO_POWERCAP "/intel-rapl/enabled"; > + return sysfs_set_enabled(path, mode); Did you compile this? thanks, -- Shuah