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Message-Id: <1500489596-23255-4-git-send-email-shilpa.bhat@linux.vnet.ibm.com>
Date: Thu, 20 Jul 2017 00:09:56 +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 V7 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 V6:
- Removed a generic read/write interface for all commands. Commands to
set powercap and power-shifting-ratio has been implemented as
generic framework and this driver supports non-generic platform
commands.
arch/powerpc/include/asm/opal-api.h | 3 +-
arch/powerpc/include/asm/opal.h | 1 +
arch/powerpc/include/uapi/asm/opal-occ.h | 23 ++++++
arch/powerpc/platforms/powernv/Makefile | 2 +-
arch/powerpc/platforms/powernv/opal-occ.c | 108 +++++++++++++++++++++++++
arch/powerpc/platforms/powernv/opal-wrappers.S | 1 +
arch/powerpc/platforms/powernv/opal.c | 3 +
7 files changed, 139 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 0d37315..e849bd2 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_PSR 154
#define OPAL_SET_PSR 155
-#define OPAL_LAST 155
+#define OPAL_CLEAR_SENSOR_GROUPS 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 58b30a4..ccf42ae 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_shifting_ratio(u32 handle, int token, u32 *psr);
int opal_set_power_shifting_ratio(u32 handle, int token, u32 psr);
+int opal_clear_sensor_groups(u32 group_hndl, int token);
/* Internal functions */
extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
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..76b8526
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-occ.c
@@ -0,0 +1,108 @@
+/*
+ * 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);
+
+static int send_occ_command(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;
+ }
+
+ mutex_lock(&opal_occ_mutex);
+ rc = opal_clear_sensor_groups(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 %d\n", rc);
+ goto out;
+ }
+ rc = opal_get_async_rc(async_msg);
+ }
+out:
+ mutex_unlock(&opal_occ_mutex);
+ opal_async_release_token(token);
+ return opal_error_code(rc);
+}
+
+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 = send_occ_command(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 9867726..aae48ed 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_shifting_ratio, OPAL_GET_PSR);
OPAL_CALL(opal_set_power_shifting_ratio, OPAL_SET_PSR);
+OPAL_CALL(opal_clear_sensor_groups, OPAL_CLEAR_SENSOR_GROUPS);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index f34033f..9fc4a47 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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