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Sun, 9 Mar 2025 21:39:29 +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, sv@linux.ibm.com Subject: [PATCH v7 5/7] powerpc/pseries: Add ibm,get-dynamic-sensor-state RTAS call support Date: Sun, 9 Mar 2025 14:39:13 -0700 Message-ID: <20250309213916.762116-6-haren@linux.ibm.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250309213916.762116-1-haren@linux.ibm.com> References: <20250309213916.762116-1-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-GUID: co16eU4SoAZGl9fqK5hsxKVDeNYX5SWI X-Proofpoint-ORIG-GUID: _yT2lX9ohu18bI-5GWFfkkrFyXZGaKn6 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-09_08,2025-03-07_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 mlxscore=0 priorityscore=1501 suspectscore=0 adultscore=0 spamscore=0 phishscore=0 bulkscore=0 clxscore=1015 mlxlogscore=999 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502100000 definitions=main-2503090171 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 | 67 +++++++++++++++++++ 3 files changed, 69 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 a5f344cc2e53..fb4586bf3c69 100644 --- a/arch/powerpc/platforms/pseries/papr-indices.c +++ b/arch/powerpc/platforms/pseries/papr-indices.c @@ -372,6 +372,67 @@ 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)) { + ret = PTR_ERR(work_area); + goto out; + } + + 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); + + switch (fwrc) { + case RTAS_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_HARDWARE_ERROR: /* Hardware/platform error */ + ret = -EIO; + break; + } + +out: + mutex_unlock(&rtas_ibm_get_dynamic_sensor_state_lock); + return ret; +} + /* * Top-level ioctl handler for /dev/papr-indices. */ @@ -385,6 +446,9 @@ 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); @@ -417,6 +481,9 @@ 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