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| author | Haren Myneni <haren@linux.ibm.com> | 2025-04-16 15:57:39 -0700 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2025-04-17 11:42:29 +0530 |
| commit | f60a3796f84f96d21de1a4fa2b9fd0637378f026 (patch) | |
| tree | 8dddb95a5f0f44b66076b58844708a7de2c9a92a /arch/powerpc/kernel | |
| parent | 6e9aec544682670e884f02fab910021c5d87985e (diff) | |
| download | linux-f60a3796f84f96d21de1a4fa2b9fd0637378f026.tar.gz linux-f60a3796f84f96d21de1a4fa2b9fd0637378f026.tar.bz2 linux-f60a3796f84f96d21de1a4fa2b9fd0637378f026.zip | |
powerpc/pseries: Add ibm,set-dynamic-indicator RTAS call support
The RTAS call ibm,set-dynamic-indicator is used to set the new
indicator state identified by a location code. The current
implementation uses rtas_set_dynamic_indicator() API provided by
librtas library which allocates RMO buffer and issue this RTAS
call in the user space. But /dev/mem access by the user space
is prohibited under system lockdown.
This patch provides an interface with new ioctl
PAPR_DYNAMIC_INDICATOR_IOC_SET to the papr-indices character
driver and expose this interface to the user space that is
compatible with lockdown.
Refer PAPR 7.3.18 ibm,set-dynamic-indicator for more
information on this RTAS call.
- User input parameters to the RTAS call: location code
string, indicator token and new state
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_INDICATOR_IOC_SET,
struct papr_indices_io_block)
- The user space passes input parameters in papr_indices_io_block
struct
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/20250416225743.596462-5-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 039ac5099aed..e497b3b95ef2 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -95,9 +95,9 @@ 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); -static DEFINE_MUTEX(rtas_ibm_set_dynamic_indicator_lock); DEFINE_MUTEX(rtas_ibm_get_vpd_lock); DEFINE_MUTEX(rtas_ibm_get_indices_lock); +DEFINE_MUTEX(rtas_ibm_set_dynamic_indicator_lock); static struct rtas_function rtas_function_table[] __ro_after_init = { [RTAS_FNIDX__CHECK_EXCEPTION] = { |