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 <ha...@linux.ibm.com>
---
.../userspace-api/ioctl/ioctl-number.rst | 2 +
arch/powerpc/include/uapi/asm/papr-indices.h | 41 +++++++++++++++++++
2 files changed, 43 insertions(+)
create mode 100644 arch/powerpc/include/uapi/asm/papr-indices.h
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst
b/Documentation/userspace-api/ioctl/ioctl-number.rst
index 6d1465315df3..f9332b634116 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -363,6 +363,8 @@ Code Seq# Include File
Comments
<mailto:linuxppc-dev>
0xB2 01-02 arch/powerpc/include/uapi/asm/papr-sysparm.h
powerpc/pseries system parameter API
<mailto:linuxppc-dev>
+0xB2 03-05 arch/powerpc/include/uapi/asm/papr-indices.h
powerpc/pseries indices API
+
<mailto:linuxppc-dev>
0xB3 00 linux/mmc/ioctl.h
0xB4 00-0F linux/gpio.h
<mailto:linux-g...@vger.kernel.org>
0xB5 00-0F uapi/linux/rpmsg.h
<mailto:linux-remotep...@vger.kernel.org>
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_ */
--
2.43.5
