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Message-Id: <1501467858-8887-4-git-send-email-shilpa.bhat@linux.vnet.ibm.com>
Date: Mon, 31 Jul 2017 07:54:18 +0530
From: Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
To: stewart@...ux.vnet.ibm.com, cyrilbur@...il.com
Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
ego@...ux.vnet.ibm.com, svaidy@...ux.vnet.ibm.com,
Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH V9 3/3] powernv: Add support to clear sensor groups data
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@...ux.vnet.ibm.com>
---
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
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