[PATCH V9 3/3] powernv: Add support to clear sensor groups data
From: Shilpasri G Bhat
Date: Sun Jul 30 2017 - 22:24:51 EST
Adds support for clearing different sensor groups. OCC inband sensor
groups like CSM, Profiler, Job Scheduler can be cleared using this
driver. The min/max of all sensors belonging to these sensor groups
will be cleared.
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@xxxxxxxxxxxxxxxxxx>
---
Changes from V8:
- Use mutex_lock_interruptible()
- Fix error codes returned to user
arch/powerpc/include/asm/opal-api.h | 3 +-
arch/powerpc/include/asm/opal.h | 2 +
arch/powerpc/include/uapi/asm/opal-occ.h | 23 +++++
arch/powerpc/platforms/powernv/Makefile | 2 +-
arch/powerpc/platforms/powernv/opal-occ.c | 115 +++++++++++++++++++++++++
arch/powerpc/platforms/powernv/opal-wrappers.S | 1 +
arch/powerpc/platforms/powernv/opal.c | 3 +
7 files changed, 147 insertions(+), 2 deletions(-)
create mode 100644 arch/powerpc/include/uapi/asm/opal-occ.h
create mode 100644 arch/powerpc/platforms/powernv/opal-occ.c
diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 92e31fd..0841659 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -195,7 +195,8 @@
#define OPAL_SET_POWERCAP 153
#define OPAL_GET_POWER_SHIFT_RATIO 154
#define OPAL_SET_POWER_SHIFT_RATIO 155
-#define OPAL_LAST 155
+#define OPAL_SENSOR_GROUPS_CLEAR 156
+#define OPAL_LAST 156
/* Device tree flags */
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index b9ea77f..a716def 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -271,6 +271,7 @@ int64_t opal_xive_set_vp_info(uint64_t vp,
int opal_set_powercap(u32 handle, int token, u32 pcap);
int opal_get_power_shift_ratio(u32 handle, int token, u32 *psr);
int opal_set_power_shift_ratio(u32 handle, int token, u32 psr);
+int opal_sensor_groups_clear(u32 group_hndl, int token);
/* Internal functions */
extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
@@ -351,6 +352,7 @@ static inline int opal_get_async_rc(struct opal_msg msg)
void opal_powercap_init(void);
void opal_psr_init(void);
+int opal_sensor_groups_clear_history(u32 handle);
#endif /* __ASSEMBLY__ */
diff --git a/arch/powerpc/include/uapi/asm/opal-occ.h b/arch/powerpc/include/uapi/asm/opal-occ.h
new file mode 100644
index 0000000..97c45e2
--- /dev/null
+++ b/arch/powerpc/include/uapi/asm/opal-occ.h
@@ -0,0 +1,23 @@
+/*
+ * OPAL OCC command interface
+ * Supported on POWERNV platform
+ *
+ * (C) Copyright IBM 2017
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _UAPI_ASM_POWERPC_OPAL_OCC_H_
+#define _UAPI_ASM_POWERPC_OPAL_OCC_H_
+
+#define OPAL_OCC_IOCTL_CLEAR_SENSOR_GROUPS _IOR('o', 1, u32)
+
+#endif /* _UAPI_ASM_POWERPC_OPAL_OCC_H */
diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index 9ed7d33..f193b33 100644
--- a/arch/powerpc/platforms/powernv/Makefile
+++ b/arch/powerpc/platforms/powernv/Makefile
@@ -2,7 +2,7 @@ obj-y += setup.o opal-wrappers.o opal.o opal-async.o idle.o
obj-y += opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
obj-y += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o
-obj-y += opal-kmsg.o opal-powercap.o opal-psr.o
+obj-y += opal-kmsg.o opal-powercap.o opal-psr.o opal-occ.o
obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o
diff --git a/arch/powerpc/platforms/powernv/opal-occ.c b/arch/powerpc/platforms/powernv/opal-occ.c
new file mode 100644
index 0000000..f3ce880
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-occ.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright IBM Corporation 2017
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "opal-occ: " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/miscdevice.h>
+#include <linux/fs.h>
+#include <asm/opal.h>
+#include <asm/opal-occ.h>
+
+DEFINE_MUTEX(opal_occ_mutex);
+
+int opal_sensor_groups_clear_history(u32 handle)
+{
+ struct opal_msg async_msg;
+ int token, rc;
+
+ token = opal_async_get_token_interruptible();
+ if (token < 0) {
+ pr_devel("Failed to get the token %d\n", token);
+ return token;
+ }
+
+ rc = mutex_lock_interruptible(&opal_occ_mutex);
+ if (rc)
+ return rc;
+
+ rc = opal_sensor_groups_clear(handle, token);
+ if (rc == OPAL_ASYNC_COMPLETION) {
+ rc = opal_async_wait_response(token, &async_msg);
+ if (rc) {
+ pr_devel("Failed to wait for async response\n");
+ rc = -EIO;
+ goto out;
+ }
+ rc = opal_get_async_rc(async_msg);
+ }
+
+ rc = opal_error_code(rc);
+out:
+ mutex_unlock(&opal_occ_mutex);
+ opal_async_release_token(token);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(opal_sensor_groups_clear_history);
+
+static long opal_occ_ioctl(struct file *file, unsigned int cmd,
+ unsigned long param)
+{
+ int rc = -EINVAL;
+
+ switch (cmd) {
+ case OPAL_OCC_IOCTL_CLEAR_SENSOR_GROUPS:
+ rc = opal_sensor_groups_clear_history(param);
+ break;
+ default:
+ break;
+ }
+
+ return rc;
+}
+
+static const struct file_operations opal_occ_fops = {
+ .unlocked_ioctl = opal_occ_ioctl,
+ .owner = THIS_MODULE,
+};
+
+static struct miscdevice occ_dev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "occ",
+ .fops = &opal_occ_fops,
+};
+
+static int opal_occ_probe(struct platform_device *pdev)
+{
+ return misc_register(&occ_dev);
+}
+
+static int opal_occ_remove(struct platform_device *pdev)
+{
+ misc_deregister(&occ_dev);
+ return 0;
+}
+
+static const struct of_device_id opal_occ_match[] = {
+ { .compatible = "ibm,opal-occ-sensor-group" },
+ { },
+};
+
+static struct platform_driver opal_occ_driver = {
+ .driver = {
+ .name = "opal-occ",
+ .of_match_table = opal_occ_match,
+ },
+ .probe = opal_occ_probe,
+ .remove = opal_occ_remove,
+};
+
+module_platform_driver(opal_occ_driver);
+
+MODULE_DESCRIPTION("PowerNV OPAL-OCC driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index f565979..0613408 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -314,3 +314,4 @@ OPAL_CALL(opal_get_powercap, OPAL_GET_POWERCAP);
OPAL_CALL(opal_set_powercap, OPAL_SET_POWERCAP);
OPAL_CALL(opal_get_power_shift_ratio, OPAL_GET_POWER_SHIFT_RATIO);
OPAL_CALL(opal_set_power_shift_ratio, OPAL_SET_POWER_SHIFT_RATIO);
+OPAL_CALL(opal_sensor_groups_clear, OPAL_SENSOR_GROUPS_CLEAR);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 280a736..097c33c 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -842,6 +842,9 @@ static int __init opal_init(void)
/* Initialise OPAL Power-Shifting-Ratio interface */
opal_psr_init();
+ /* Initialize platform device: OCC interface */
+ opal_pdev_init("ibm,opal-occ-sensor-group");
+
return 0;
}
machine_subsys_initcall(powernv, opal_init);
--
1.8.3.1