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Wed, 06 May 2020 11:08:04 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 046B82BP62849244 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 6 May 2020 11:08:02 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9EB1DA4053; Wed, 6 May 2020 11:08:02 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id AE6D4A4040; Wed, 6 May 2020 11:07:58 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.199.39.184]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 6 May 2020 11:07:58 +0000 (GMT) From: Kajol Jain To: acme@kernel.org, linuxppc-dev@lists.ozlabs.org, mpe@ellerman.id.au, suka@us.ibm.com Subject: [PATCH v8 2/5] powerpc/hv-24x7: Add rtas call in hv-24x7 driver to get processor details Date: Wed, 6 May 2020 16:37:34 +0530 Message-Id: <20200506110737.14904-3-kjain@linux.ibm.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200506110737.14904-1-kjain@linux.ibm.com> References: <20200506110737.14904-1-kjain@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.676 definitions=2020-05-06_03:2020-05-05, 2020-05-06 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=999 clxscore=1015 priorityscore=1501 malwarescore=0 impostorscore=0 bulkscore=0 suspectscore=0 adultscore=0 phishscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005060079 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: ravi.bangoria@linux.ibm.com, maddy@linux.vnet.ibm.com, jmario@redhat.com, peterz@infradead.org, gregkh@linuxfoundation.org, mpetlan@redhat.com, alexander.shishkin@linux.intel.com, ak@linux.intel.com, yao.jin@linux.intel.com, anju@linux.vnet.ibm.com, mamatha4@linux.vnet.ibm.com, jolsa@kernel.org, namhyung@kernel.org, mingo@kernel.org, kan.liang@linux.intel.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" For hv_24x7 socket/chip level events, specific chip-id to which the data requested should be added as part of pmu events. But number of chips/socket in the system details are not exposed. Patch implements read_sys_info_pseries() to get system parameter values like number of sockets and chips per socket. Rtas_call with token "PROCESSOR_MODULE_INFO" is used to get these values. Sub-sequent patch exports these values via sysfs. Patch also make these parameters default to 1. Signed-off-by: Kajol Jain --- arch/powerpc/include/asm/rtas.h | 1 + arch/powerpc/perf/hv-24x7.c | 72 +++++++++++++++++++++++++++++++++ 2 files changed, 73 insertions(+) diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h index 3c1887351c71..1c11f814932d 100644 --- a/arch/powerpc/include/asm/rtas.h +++ b/arch/powerpc/include/asm/rtas.h @@ -482,6 +482,7 @@ static inline void rtas_initialize(void) { }; #endif extern int call_rtas(const char *, int, int, unsigned long *, ...); +extern void read_sys_info_pseries(void); #endif /* __KERNEL__ */ #endif /* _POWERPC_RTAS_H */ diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c index 48e8f4b17b91..8cf242aad98f 100644 --- a/arch/powerpc/perf/hv-24x7.c +++ b/arch/powerpc/perf/hv-24x7.c @@ -20,6 +20,7 @@ #include #include +#include #include "hv-24x7.h" #include "hv-24x7-catalog.h" #include "hv-common.h" @@ -57,6 +58,75 @@ static bool is_physical_domain(unsigned domain) } } +/* + * The Processor Module Information system parameter allows transferring + * of certain processor module information from the platform to the OS. + * Refer PAPR+ document to get parameter token value as '43'. + */ + +#define PROCESSOR_MODULE_INFO 43 +#define PROCESSOR_MAX_LENGTH (8 * 1024) + +DEFINE_SPINLOCK(rtas_local_data_buf_lock); +EXPORT_SYMBOL(rtas_local_data_buf_lock); + +static u32 phys_sockets; /* Physical sockets */ +static u32 phys_chipspersocket; /* Physical chips per socket*/ +static u32 phys_coresperchip; /* Physical cores per chip */ + +/* + * Function read_sys_info_pseries() make a rtas_call which require + * data buffer of size 8K. As standard 'rtas_data_buf' is of size + * 4K, we are adding new local buffer 'rtas_local_data_buf'. + */ +static __be16 rtas_local_data_buf[PROCESSOR_MAX_LENGTH] __cacheline_aligned; + +/* + * read_sys_info_pseries() + * Retrieve the number of sockets and chips per socket and cores per + * chip details through the get-system-parameter rtas call. + */ +void read_sys_info_pseries(void) +{ + int call_status, len, ntypes; + + /* + * Making system parameter: chips and sockets and cores per chip + * default to 1. + */ + phys_sockets = 1; + phys_chipspersocket = 1; + phys_coresperchip = 1; + memset(rtas_local_data_buf, 0, PROCESSOR_MAX_LENGTH * sizeof(__be16)); + spin_lock(&rtas_local_data_buf_lock); + + call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, + NULL, + PROCESSOR_MODULE_INFO, + __pa(rtas_local_data_buf), + PROCESSOR_MAX_LENGTH); + + spin_unlock(&rtas_local_data_buf_lock); + + if (call_status != 0) { + pr_info("Error calling get-system-parameter (0x%x)\n", + call_status); + } else { + rtas_local_data_buf[PROCESSOR_MAX_LENGTH - 1] = '\0'; + len = be16_to_cpup((__be16 *)&rtas_local_data_buf[0]); + if (len < 4) + return; + + ntypes = be16_to_cpup(&rtas_local_data_buf[1]); + + if (!ntypes) + return; + phys_sockets = be16_to_cpup(&rtas_local_data_buf[2]); + phys_chipspersocket = be16_to_cpup(&rtas_local_data_buf[3]); + phys_coresperchip = be16_to_cpup(&rtas_local_data_buf[4]); + } +} + /* Domains for which more than one result element are returned for each event. */ static bool domain_needs_aggregation(unsigned int domain) { @@ -1605,6 +1675,8 @@ static int hv_24x7_init(void) if (r) return r; + read_sys_info_pseries(); + return 0; } -- 2.18.2