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Fri, 9 Jun 2023 11:40:27 +0000 (GMT) From: Kajol Jain To: mpe@ellerman.id.au Subject: [PATCH 05/10] powerpc/hv_gpci: Add sysfs file inside hv_gpci device to show affinity domain via virtual processor information Date: Fri, 9 Jun 2023 17:09:56 +0530 Message-Id: <20230609114001.169235-6-kjain@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230609114001.169235-1-kjain@linux.ibm.com> References: <20230609114001.169235-1-kjain@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: QOCJNLpGlKXHkWwiMGFVz38iGGw5ivM- X-Proofpoint-ORIG-GUID: QOCJNLpGlKXHkWwiMGFVz38iGGw5ivM- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.573,FMLib:17.11.176.26 definitions=2023-06-09_08,2023-06-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 malwarescore=0 mlxlogscore=974 bulkscore=0 adultscore=0 suspectscore=0 priorityscore=1501 spamscore=0 mlxscore=0 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306090097 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: disgoel@linux.ibm.com, kjain@linux.ibm.com, atrajeev@linux.vnet.ibm.com, maddy@linux.ibm.com, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" The hcall H_GET_PERF_COUNTER_INFO with counter request value as AFFINITY_DOMAIN_INFORMATION_BY_VIRTUAL_PROCESSOR(0XA0), can be used to get the system affinity domain via virtual processor information. To expose the system affinity domain via virtual processor information, patch adds sysfs file called "affinity_domain_via_virtual_processor" to the "/sys/devices/hv_gpci/interface/" of hv_gpci pmu driver. Add macro for AFFINITY_DOMAIN_VIA_VP, which points to counter request value for "affinity_domain_via_virtual_processor" in hv-gpci.h file. The affinity_domain_via_virtual_processor sysfs file is only available for power10 and above platforms. Add a macro called INTERFACE_AFFINITY_DOMAIN_VIA_VP_ATTR, which points to the index of NULL placeholder, for affinity_domain_via_virtual_processor attribute in interface_attrs array. Also updated the value of INTERFACE_NULL_ATTR macro in hv-gpci.h file. Signed-off-by: Kajol Jain --- arch/powerpc/perf/hv-gpci.c | 84 +++++++++++++++++++++++++++++++++++++ arch/powerpc/perf/hv-gpci.h | 4 +- 2 files changed, 87 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/perf/hv-gpci.c b/arch/powerpc/perf/hv-gpci.c index c9fe74373e5f..cac726f06221 100644 --- a/arch/powerpc/perf/hv-gpci.c +++ b/arch/powerpc/perf/hv-gpci.c @@ -303,6 +303,75 @@ static ssize_t processor_config_show(struct device *dev, struct device_attribute return ret; } +static ssize_t affinity_domain_via_virtual_processor_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct hv_gpci_request_buffer *arg; + unsigned long ret; + size_t n = 0; + + arg = (void *)get_cpu_var(hv_gpci_reqb); + memset(arg, 0, HGPCI_REQ_BUFFER_SIZE); + + /* + * Pass the counter request 0xA0 corresponds to request + * type 'Affinity_domain_information_by_virutal_processor', + * to retrieve the system affinity domain information. + * starting_index value refers to the starting hardware + * processor index. + */ + ret = systeminfo_gpci_request(AFFINITY_DOMAIN_VIA_VP, 0, 0, buf, &n, arg); + + if (!ret) + return n; + + if (ret != H_PARAMETER) + goto out; + + /* + * ret value as 'H_PARAMETER' corresponds to 'GEN_BUF_TOO_SMALL', which + * implies that buffer can't accommodate all information, and a partial buffer + * returned. To handle that, we need to take subsequent requests + * with next secondary index to retrieve additional (missing) data. + * Below loop do subsequent hcalls with next secondary index and add it + * to buffer util we get all the information. + */ + while (ret == H_PARAMETER) { + int returned_values = be16_to_cpu(arg->params.returned_values); + int elementsize = be16_to_cpu(arg->params.cv_element_size); + int last_element = (returned_values - 1) * elementsize; + + /* + * Since the starting index and secondary index type is part of the + * counter_value buffer elements, use the starting index value in the + * last array element as subsequent starting index, and use secondary index + * value in the last array element plus 1 as subsequent secondary index. + * For counter request '0xA0', starting index points to partition id + * and secondary index points to corresponding virtual processor index. + */ + u32 starting_index = arg->bytes[last_element + 1] + (arg->bytes[last_element] << 8); + u16 secondary_index = arg->bytes[last_element + 3] + + (arg->bytes[last_element + 2] << 8) + 1; + + memset(arg, 0, HGPCI_REQ_BUFFER_SIZE); + + ret = systeminfo_gpci_request(AFFINITY_DOMAIN_VIA_VP, starting_index, + secondary_index, buf, &n, arg); + + if (!ret) + return n; + + if (ret != H_PARAMETER) + goto out; + } + + return n; + +out: + put_cpu_var(hv_gpci_reqb); + return ret; +} + static DEVICE_ATTR_RO(kernel_version); static DEVICE_ATTR_RO(cpumask); @@ -329,6 +398,11 @@ static struct attribute *interface_attrs[] = { * attribute, set in init function if applicable. */ NULL, + /* + * This NULL is a placeholder for the affinity_domain_via_virtual_processor + * attribute, set in init function if applicable. + */ + NULL, NULL, }; @@ -561,6 +635,10 @@ static void sysinfo_device_attr_create(int sysinfo_interface_group_index) attr->attr.name = "processor_config"; attr->show = processor_config_show; break; + case INTERFACE_AFFINITY_DOMAIN_VIA_VP_ATTR: + attr->attr.name = "affinity_domain_via_virtual_processor"; + attr->show = affinity_domain_via_virtual_processor_show; + break; } attr->attr.mode = 0444; @@ -574,6 +652,12 @@ static void add_sysinfo_interface_files(void) /* Add processor_config attribute in the interface_attrs attribute array */ sysinfo_device_attr_create(INTERFACE_PROCESSOR_CONFIG_ATTR); + + /* + * Add affinity_domain_via_virtual_processor attribute in the + * interface_attrs attribute array + */ + sysinfo_device_attr_create(INTERFACE_AFFINITY_DOMAIN_VIA_VP_ATTR); } static int hv_gpci_init(void) diff --git a/arch/powerpc/perf/hv-gpci.h b/arch/powerpc/perf/hv-gpci.h index 0d324a7c684b..c88599fbcaa5 100644 --- a/arch/powerpc/perf/hv-gpci.h +++ b/arch/powerpc/perf/hv-gpci.h @@ -26,11 +26,13 @@ enum { /* Counter request value to retrieve system information */ #define PROCESSOR_BUS_TOPOLOGY 0XD0 #define PROCESSOR_CONFIG 0X90 +#define AFFINITY_DOMAIN_VIA_VP 0xA0 /* affinity domain via virtual processor */ /* Interface attribute array index to store system information */ #define INTERFACE_PROCESSOR_BUS_TOPOLOGY_ATTR 6 #define INTERFACE_PROCESSOR_CONFIG_ATTR 7 -#define INTERFACE_NULL_ATTR 8 +#define INTERFACE_AFFINITY_DOMAIN_VIA_VP_ATTR 8 +#define INTERFACE_NULL_ATTR 9 #define REQUEST_FILE "../hv-gpci-requests.h" #define NAME_LOWER hv_gpci -- 2.35.3