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| author | Haren Myneni <haren@linux.ibm.com> | 2025-04-16 15:57:40 -0700 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2025-04-17 11:42:29 +0530 |
| commit | 496c7524dcec16d3993382db35b960f8c3955083 (patch) | |
| tree | b31963672ec10a8172a28ac57f33cdac4130a4ed /arch/powerpc/kernel | |
| parent | f60a3796f84f96d21de1a4fa2b9fd0637378f026 (diff) | |
| download | linux-496c7524dcec16d3993382db35b960f8c3955083.tar.gz linux-496c7524dcec16d3993382db35b960f8c3955083.tar.bz2 linux-496c7524dcec16d3993382db35b960f8c3955083.zip | |
powerpc/pseries: Add ibm,get-dynamic-sensor-state RTAS call support
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 <haren@linux.ibm.com>
Tested-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416225743.596462-6-haren@linux.ibm.com
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/rtas.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index e497b3b95ef2..2aab71481da3 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] = { |