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Shenoy" To: Nathan Lynch , Michael Ellerman , Vaidyanathan Srinivasan , Kamalesh Babulal , "Naveen N. Rao" , Tyrel Datwyler Subject: [PATCH v3 4/6] powerpc/sysfs: Show idle_purr and idle_spurr for every CPU Date: Wed, 11 Mar 2020 15:07:39 +0530 Message-Id: <1583919461-27405-5-git-send-email-ego@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1583919461-27405-1-git-send-email-ego@linux.vnet.ibm.com> References: <1583919461-27405-1-git-send-email-ego@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-03-11_02:2020-03-10, 2020-03-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 mlxscore=0 spamscore=0 mlxlogscore=968 bulkscore=0 malwarescore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 priorityscore=1501 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003110061 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Gautham R. Shenoy" , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: "Gautham R. Shenoy" On Pseries LPARs, to calculate utilization, we need to know the [S]PURR ticks when the CPUs were busy or idle. The total PURR and SPURR ticks are already exposed via the per-cpu sysfs files "purr" and "spurr". This patch adds support for exposing the idle PURR and SPURR ticks via new per-cpu sysfs files named "idle_purr" and "idle_spurr". Signed-off-by: Gautham R. Shenoy --- arch/powerpc/kernel/sysfs.c | 54 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 51 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c index 479c706..c9ddb83 100644 --- a/arch/powerpc/kernel/sysfs.c +++ b/arch/powerpc/kernel/sysfs.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include "cacheinfo.h" @@ -760,6 +761,42 @@ static void create_svm_file(void) } #endif /* CONFIG_PPC_SVM */ +static void read_idle_purr(void *val) +{ + u64 *ret = val; + + *ret = read_this_idle_purr(); +} + +static ssize_t idle_purr_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, dev); + u64 val; + + smp_call_function_single(cpu->dev.id, read_idle_purr, &val, 1); + return sprintf(buf, "%llx\n", val); +} +static DEVICE_ATTR(idle_purr, 0400, idle_purr_show, NULL); + +static void read_idle_spurr(void *val) +{ + u64 *ret = val; + + *ret = read_this_idle_spurr(); +} + +static ssize_t idle_spurr_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cpu *cpu = container_of(dev, struct cpu, dev); + u64 val; + + smp_call_function_single(cpu->dev.id, read_idle_spurr, &val, 1); + return sprintf(buf, "%llx\n", val); +} +static DEVICE_ATTR(idle_spurr, 0400, idle_spurr_show, NULL); + static int register_cpu_online(unsigned int cpu) { struct cpu *c = &per_cpu(cpu_devices, cpu); @@ -823,10 +860,15 @@ static int register_cpu_online(unsigned int cpu) if (!firmware_has_feature(FW_FEATURE_LPAR)) add_write_permission_dev_attr(&dev_attr_purr); device_create_file(s, &dev_attr_purr); + if (firmware_has_feature(FW_FEATURE_LPAR)) + device_create_file(s, &dev_attr_idle_purr); } - if (cpu_has_feature(CPU_FTR_SPURR)) + if (cpu_has_feature(CPU_FTR_SPURR)) { device_create_file(s, &dev_attr_spurr); + if (firmware_has_feature(FW_FEATURE_LPAR)) + device_create_file(s, &dev_attr_idle_spurr); + } if (cpu_has_feature(CPU_FTR_DSCR)) device_create_file(s, &dev_attr_dscr); @@ -910,11 +952,17 @@ static int unregister_cpu_online(unsigned int cpu) device_remove_file(s, &dev_attr_mmcra); #endif /* CONFIG_PMU_SYSFS */ - if (cpu_has_feature(CPU_FTR_PURR)) + if (cpu_has_feature(CPU_FTR_PURR)) { device_remove_file(s, &dev_attr_purr); + if (firmware_has_feature(FW_FEATURE_LPAR)) + device_remove_file(s, &dev_attr_idle_purr); + } - if (cpu_has_feature(CPU_FTR_SPURR)) + if (cpu_has_feature(CPU_FTR_SPURR)) { device_remove_file(s, &dev_attr_spurr); + if (firmware_has_feature(FW_FEATURE_LPAR)) + device_remove_file(s, &dev_attr_idle_spurr); + } if (cpu_has_feature(CPU_FTR_DSCR)) device_remove_file(s, &dev_attr_dscr); -- 1.9.4