From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 978BBE77197 for ; Sat, 4 Jan 2025 20:47:59 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4YQXZ85M82z30W6; Sun, 5 Jan 2025 07:47:28 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=148.163.156.1 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1736023648; cv=none; b=Y2WB4rpgbusYNtakxEPi8UswMM0kT/Xk5ijbEiey8Lhv+g8apebF6g8pDzFi420dGuhpbZQKn/t1CobXUTq5FjtevXeT8+NH1TzinyO2m9YVKBxJqA0LG/4iQj7YyRMefHPNF0lH9LHb/y0IxZa+bXECU9rsEFnBYIo4FBKXXPp/0DjTc1sefTMKNPc68ZbKP7h11+tdIgC56k6EK7KndPKAkQot/pkEYZrp6vnXYEJKIfxoye//7Nma/NILNxPheT85YoWA1DR0hkz3GPu0xrxENwsUFUnMe8gNxTZj8BauI+Up6gve0dFs2ehci0rmKL0D/5/hgKoY8N9wvFR28A== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1736023648; c=relaxed/relaxed; bh=pEWb6LulazKFYWIeQv81Tl6r0XKE/Ti8AjTB/gEGJtU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HdZsGGs7RPjh7lGK9Ca5US6m/xXf+QSMUXI0owdXszTZ5vTiRhVF05Eeo5/3QeSkhQAeDXCERo5TXWXtb6mXEwYH44t0qpu55mJWLUBfN3mK7kTpeHRrycidl1/0bFhZ7FP1CnqPyq0nfrzH2tRIIcVwRQCj7mUb5yHggu1nxrmC6GFwMfRlpE6antZTIC8SST6/JvCYIf1Pj5A5EJZx3M5IvxG+I2cvZQm4+nTrb6sZPdVOPic8U8BhpdA0qbemEhlMbpMgPjiPlHOozkHkkw6r5Tdy3ZnmrHprtqJcp5NF91VoZ27zhd2vVItNAhjHjx+q4k6NTGfOBXa9nRQa+g== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=Tp+gXvkt; dkim-atps=neutral; spf=pass (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=haren@linux.ibm.com; receiver=lists.ozlabs.org) smtp.mailfrom=linux.ibm.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=Tp+gXvkt; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=haren@linux.ibm.com; receiver=lists.ozlabs.org) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4YQXZ75h0mz2ynn for ; Sun, 5 Jan 2025 07:47:27 +1100 (AEDT) Received: from pps.filterd (m0360083.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 504CvaY1004647; Sat, 4 Jan 2025 20:47:21 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=pEWb6LulazKFYWIeQ v81Tl6r0XKE/Ti8AjTB/gEGJtU=; b=Tp+gXvkt60ThAsH1a/lq2GtCQIPqeP6OH UrmMBhQCbhN9whBBy+WCP0Fjc5hJ8X+kkAdrHy3bW3sqeaP9E1CHqDe0/ib3FwOH RxgeJCz/3GJiJQHiF0Y4yeduoliLemXcYsw/d0DJC//BwOZNphHshIcCUvnQpbAs b0x2h+8VBwY1inVPddCsyx4g0U3vK0o5nMDFw9Nym8XxBq00QLq5QrTTb0V9rT8L w1VNJoEXCtnoRvVSGyYSQ/Qn0ipx1aUYSW0m4ZWzLTjzG3/0OPz1F5Vt49tGVXoy LIK+2VwxEmbbPIziGwFd/IA92ZlyQBSsJbdrE9q1xneMy4sgU7EgA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 43xwfbadje-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 04 Jan 2025 20:47:21 +0000 (GMT) Received: from m0360083.ppops.net (m0360083.ppops.net [127.0.0.1]) by pps.reinject (8.18.0.8/8.18.0.8) with ESMTP id 504KlKR1007238; Sat, 4 Jan 2025 20:47:20 GMT Received: from ppma11.dal12v.mail.ibm.com (db.9e.1632.ip4.static.sl-reverse.com [50.22.158.219]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 43xwfbadja-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 04 Jan 2025 20:47:20 +0000 (GMT) Received: from pps.filterd (ppma11.dal12v.mail.ibm.com [127.0.0.1]) by ppma11.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 504K1RDS026999; Sat, 4 Jan 2025 20:47:19 GMT Received: from smtprelay04.wdc07v.mail.ibm.com ([172.16.1.71]) by ppma11.dal12v.mail.ibm.com (PPS) with ESMTPS id 43txc2bcvy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 04 Jan 2025 20:47:19 +0000 Received: from smtpav03.wdc07v.mail.ibm.com (smtpav03.wdc07v.mail.ibm.com [10.39.53.230]) by smtprelay04.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 504KlGCS47579598 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sat, 4 Jan 2025 20:47:16 GMT Received: from smtpav03.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 51C715805A; Sat, 4 Jan 2025 20:47:16 +0000 (GMT) Received: from smtpav03.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4029558054; Sat, 4 Jan 2025 20:47:15 +0000 (GMT) Received: from li-4910aacc-2eed-11b2-a85c-d93b702d4d28.ibm.com.com (unknown [9.61.16.236]) by smtpav03.wdc07v.mail.ibm.com (Postfix) with ESMTP; Sat, 4 Jan 2025 20:47:15 +0000 (GMT) From: Haren Myneni To: linuxppc-dev@lists.ozlabs.org Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, msuchanek@suse.de, mahesh@linux.ibm.com, tyreld@linux.ibm.com, hbabu@us.ibm.com, haren@linux.ibm.com Subject: [PATCH 5/6] powerpc/pseries: Add ibm,get-dynamic-sensor-state RTAS call support Date: Sat, 4 Jan 2025 12:46:49 -0800 Message-ID: <20250104204652.388720-6-haren@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250104204652.388720-1-haren@linux.ibm.com> References: <20250104204652.388720-1-haren@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: SX1nCJma1vYYS2gM3G7BVewfo37-A8qa X-Proofpoint-GUID: qR1FmBkGkEd1r5kqKd3QpxvAhpcEqMsN X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 mlxscore=0 mlxlogscore=999 lowpriorityscore=0 impostorscore=0 suspectscore=0 phishscore=0 malwarescore=0 priorityscore=1501 spamscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501040181 The RTAS call ibm,get-dynamic-sensor-state is used to get the sensor state identified by the location code and the sensor token. The librtas library provides an API rtas_get_dynamic_sensor() which uses /dev/mem access for work area allocation but is restricted under system lockdown. This patch provides an interface with new ioctl PAPR_DYNAMIC_SENSOR_IOC_GET to the papr-indices character driver which executes this HCALL and copies the sensor state in the user specified ioctl buffer. Refer PAPR 7.3.19 ibm,get-dynamic-sensor-state for more information on this RTAS call. - User input parameters to the RTAS call: location code string and the sensor token Expose these interfaces to user space with a /dev/papr-indices character device using the following programming model: int fd = open("/dev/papr-indices", O_RDWR); int ret = ioctl(fd, PAPR_DYNAMIC_SENSOR_IOC_GET, struct papr_indices_io_block) - The user space specifies input parameters in papr_indices_io_block struct - Returned state for the specified sensor is copied to papr_indices_io_block.dynamic_param.state Signed-off-by: Haren Myneni --- arch/powerpc/include/asm/rtas.h | 1 + arch/powerpc/kernel/rtas.c | 2 +- arch/powerpc/platforms/pseries/papr-indices.c | 64 +++++++++++++++++++ 3 files changed, 66 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h index 2da52f59e4c6..fcd822f0e1d7 100644 --- a/arch/powerpc/include/asm/rtas.h +++ b/arch/powerpc/include/asm/rtas.h @@ -517,6 +517,7 @@ extern unsigned long rtas_rmo_buf; extern struct mutex rtas_ibm_get_vpd_lock; extern struct mutex rtas_ibm_get_indices_lock; extern struct mutex rtas_ibm_set_dynamic_indicator_lock; +extern struct mutex rtas_ibm_get_dynamic_sensor_state_lock; #define GLOBAL_INTERRUPT_QUEUE 9005 diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index 88fa416730af..a4848e7f248e 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -92,12 +92,12 @@ struct rtas_function { * Per-function locks for sequence-based RTAS functions. */ static DEFINE_MUTEX(rtas_ibm_activate_firmware_lock); -static DEFINE_MUTEX(rtas_ibm_get_dynamic_sensor_state_lock); static DEFINE_MUTEX(rtas_ibm_lpar_perftools_lock); static DEFINE_MUTEX(rtas_ibm_physical_attestation_lock); DEFINE_MUTEX(rtas_ibm_get_vpd_lock); DEFINE_MUTEX(rtas_ibm_get_indices_lock); DEFINE_MUTEX(rtas_ibm_set_dynamic_indicator_lock); +DEFINE_MUTEX(rtas_ibm_get_dynamic_sensor_state_lock); static struct rtas_function rtas_function_table[] __ro_after_init = { [RTAS_FNIDX__CHECK_EXCEPTION] = { diff --git a/arch/powerpc/platforms/pseries/papr-indices.c b/arch/powerpc/platforms/pseries/papr-indices.c index 30dfd928d192..079e01d0427c 100644 --- a/arch/powerpc/platforms/pseries/papr-indices.c +++ b/arch/powerpc/platforms/pseries/papr-indices.c @@ -438,6 +438,64 @@ static long papr_dynamic_indicator_ioc_set(struct papr_indices_io_block __user * return ret; } +/** + * papr_dynamic_sensor_ioc_get - ibm,get-dynamic-sensor-state RTAS Call + * PAPR 2.13 7.3.19 + * + * @ubuf: Input parameters to RTAS call such as sensor token + * Copies the state in user space buffer. + * + * + * Returns success or -errno. + */ + +static long papr_dynamic_sensor_ioc_get(struct papr_indices_io_block __user *ubuf) +{ + struct papr_indices_io_block kbuf; + struct rtas_work_area *work_area; + s32 fwrc, token, ret; + u32 rets; + + token = rtas_function_token(RTAS_FN_IBM_GET_DYNAMIC_SENSOR_STATE); + if (token == RTAS_UNKNOWN_SERVICE) + return -ENOENT; + + mutex_lock(&rtas_ibm_get_dynamic_sensor_state_lock); + work_area = papr_dynamic_indice_buf_from_user(ubuf, &kbuf); + if (IS_ERR(work_area)) + return PTR_ERR(work_area); + + do { + fwrc = rtas_call(token, 2, 2, &rets, + kbuf.dynamic_param.token, + rtas_work_area_phys(work_area)); + } while (rtas_busy_delay(fwrc)); + + rtas_work_area_free(work_area); + mutex_unlock(&rtas_ibm_get_dynamic_sensor_state_lock); + + switch (fwrc) { + case RTAS_IBM_DYNAMIC_INDICE_SUCCESS: + if (put_user(rets, &ubuf->dynamic_param.state)) + ret = -EFAULT; + else + ret = 0; + break; + case RTAS_IBM_DYNAMIC_INDICE_NO_INDICATOR: /* No such indicator */ + ret = -EOPNOTSUPP; + break; + default: + pr_err("unexpected ibm,get-dynamic-sensor result %d\n", + fwrc); + fallthrough; + case RTAS_IBM_DYNAMIC_INDICE_HW_ERROR: /* Hardware/platform error */ + ret = -EIO; + break; + } + + return ret; +} + /* * Top-level ioctl handler for /dev/papr-indices. */ @@ -451,6 +509,9 @@ static long papr_indices_dev_ioctl(struct file *filp, unsigned int ioctl, case PAPR_INDICES_IOC_GET: ret = papr_indices_create_handle(argp); break; + case PAPR_DYNAMIC_SENSOR_IOC_GET: + ret = papr_dynamic_sensor_ioc_get(argp); + break; case PAPR_DYNAMIC_INDICATOR_IOC_SET: if (filp->f_mode & FMODE_WRITE) ret = papr_dynamic_indicator_ioc_set(argp); @@ -483,6 +544,9 @@ static __init int papr_indices_init(void) if (!rtas_function_implemented(RTAS_FN_IBM_SET_DYNAMIC_INDICATOR)) return -ENODEV; + if (!rtas_function_implemented(RTAS_FN_IBM_GET_DYNAMIC_SENSOR_STATE)) + return -ENODEV; + return misc_register(&papr_indices_dev); } machine_device_initcall(pseries, papr_indices_init); -- 2.43.5