powerpc/pseries: Define papr_indices_io_block for papr-indices ioctls

To issue ibm,get-indices, ibm,set-dynamic-indicator and
ibm,get-dynamic-sensor-state in the user space, the RMO buffer is
allocated for the work area which is restricted under system
lockdown. So instead of user space execution, the kernel will
provide /dev/papr-indices interface to execute these RTAS calls.

The user space assigns data in papr_indices_io_block struct
depends on the specific HCALL and passes to the following ioctls:

PAPR_INDICES_IOC_GET:		Use for ibm,get-indices. Returns a
				get-indices handle fd to read data.
PAPR_DYNAMIC_SENSOR_IOC_GET:	Use for  ibm,get-dynamic-sensor-state.
				Updates the sensor state in
				papr_indices_io_block.dynamic_param.state

PAPR_DYNAMIC_INDICATOR_IOC_SET:	Use for ibm,set-dynamic-indicator.
				Sets the new state for the input
				indicator.

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/20250416225743.596462-3-haren@linux.ibm.com

1 files changed, 41 insertions, 0 deletions

diff --git a/arch/powerpc/include/uapi/asm/papr-indices.h b/arch/powerpc/include/uapi/asm/papr-indices.h
new file mode 100644
index 000000000000..c2999d89d52a
--- /dev/null
+++ b/arch/powerpc/include/uapi/asm/papr-indices.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_PAPR_INDICES_H_
+#define _UAPI_PAPR_INDICES_H_
+
+#include <linux/types.h>
+#include <asm/ioctl.h>
+#include <asm/papr-miscdev.h>
+
+#define LOC_CODE_SIZE			80
+#define RTAS_GET_INDICES_BUF_SIZE	SZ_4K
+
+struct papr_indices_io_block {
+	union {
+		struct {
+			__u8 is_sensor; /* 0 for indicator and 1 for sensor */
+			__u32 indice_type;
+		} indices;
+		struct {
+			__u32 token; /* Sensor or indicator token */
+			__u32 state; /* get / set state */
+			/*
+			 * PAPR+ 12.3.2.4 Converged Location Code Rules - Length
+			 * Restrictions. 79 characters plus null.
+			 */
+			char location_code_str[LOC_CODE_SIZE]; /* location code */
+		} dynamic_param;
+	};
+};
+
+/*
+ * ioctls for /dev/papr-indices.
+ * PAPR_INDICES_IOC_GET: Returns a get-indices handle fd to read data
+ * PAPR_DYNAMIC_SENSOR_IOC_GET: Gets the state of the input sensor
+ * PAPR_DYNAMIC_INDICATOR_IOC_SET: Sets the new state for the input indicator
+ */
+#define PAPR_INDICES_IOC_GET		_IOW(PAPR_MISCDEV_IOC_ID, 3, struct papr_indices_io_block)
+#define PAPR_DYNAMIC_SENSOR_IOC_GET	_IOWR(PAPR_MISCDEV_IOC_ID, 4, struct papr_indices_io_block)
+#define PAPR_DYNAMIC_INDICATOR_IOC_SET	_IOW(PAPR_MISCDEV_IOC_ID, 5, struct papr_indices_io_block)
+
+
+#endif /* _UAPI_PAPR_INDICES_H_ */