[PATCH V7 0/3] powernv : Add support for OPAL-OCC command/response interface

[PATCH V7 0/3] powernv : Add support for OPAL-OCC command/response interface

[Shilpasri G Bhat]

In P9, OCC (On-Chip-Controller) supports shared memory based
commad-response interface. Within the shared memory there is an OPAL
command buffer and OCC response buffer that can be used to send
inband commands to OCC. The following commands are supported:

1) Set system powercap
2) Set CPU-GPU power shifting ratio
3) Clear min/max for OCC sensor groups

The skiboot patch for this interface is posted here:
https://lists.ozlabs.org/pipermail/skiboot/2017-July/008293.html

Shilpasri G Bhat (3):
  powernv: powercap: Add support for powercap framework
  powernv: Add support to set power-shifting-ratio
  powernv : Add support to clear sensor groups data

 arch/powerpc/include/asm/opal-api.h            |   8 +-
 arch/powerpc/include/asm/opal.h                |   8 +
 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-powercap.c | 237 +++++++++++++++++++++++++
 arch/powerpc/platforms/powernv/opal-psr.c      | 169 ++++++++++++++++++
 arch/powerpc/platforms/powernv/opal-wrappers.S |   5 +
 arch/powerpc/platforms/powernv/opal.c          |  10 ++
 9 files changed, 568 insertions(+), 2 deletions(-)
 create mode 100644 arch/powerpc/include/uapi/asm/opal-occ.h
 create mode 100644 arch/powerpc/platforms/powernv/opal-occ.c
 create mode 100644 arch/powerpc/platforms/powernv/opal-powercap.c
 create mode 100644 arch/powerpc/platforms/powernv/opal-psr.c

-- 
1.8.3.1

[PATCH V7 1/3] powernv: powercap: Add support for powercap framework

[Shilpasri G Bhat]

Adds a generic powercap framework to change the system powercap
inband through OPAL-OCC command/response interface.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/opal-api.h            |   5 +-
 arch/powerpc/include/asm/opal.h                |   4 +
 arch/powerpc/platforms/powernv/Makefile        |   2 +-
 arch/powerpc/platforms/powernv/opal-powercap.c | 237 +++++++++++++++++++++++++
 arch/powerpc/platforms/powernv/opal-wrappers.S |   2 +
 arch/powerpc/platforms/powernv/opal.c          |   4 +
 6 files changed, 252 insertions(+), 2 deletions(-)
 create mode 100644 arch/powerpc/platforms/powernv/opal-powercap.c

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 3130a73..c3e0c4a 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -42,6 +42,7 @@
 #define OPAL_I2C_STOP_ERR	-24
 #define OPAL_XIVE_PROVISIONING	-31
 #define OPAL_XIVE_FREE_ACTIVE	-32
+#define OPAL_TIMEOUT		-33
 
 /* API Tokens (in r0) */
 #define OPAL_INVALID_CALL		       -1
@@ -190,7 +191,9 @@
 #define OPAL_NPU_INIT_CONTEXT			146
 #define OPAL_NPU_DESTROY_CONTEXT		147
 #define OPAL_NPU_MAP_LPAR			148
-#define OPAL_LAST				148
+#define OPAL_GET_POWERCAP			152
+#define OPAL_SET_POWERCAP			153
+#define OPAL_LAST				153
 
 /* Device tree flags */
 
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 588fb1c..ec2087c 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -267,6 +267,8 @@ int64_t opal_xive_set_vp_info(uint64_t vp,
 int64_t opal_xive_free_irq(uint32_t girq);
 int64_t opal_xive_sync(uint32_t type, uint32_t id);
 int64_t opal_xive_dump(uint32_t type, uint32_t id);
+int opal_get_powercap(u32 handle, int token, u32 *pcap);
+int opal_set_powercap(u32 handle, int token, u32 pcap);
 
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
@@ -345,6 +347,8 @@ static inline int opal_get_async_rc(struct opal_msg msg)
 
 void opal_wake_poller(void);
 
+void opal_powercap_init(void);
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_OPAL_H */
diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index b5d98cb..e79f806 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
+obj-y			+= opal-kmsg.o opal-powercap.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-powercap.c b/arch/powerpc/platforms/powernv/opal-powercap.c
new file mode 100644
index 0000000..8c2cdba
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-powercap.c
@@ -0,0 +1,237 @@
+/*
+ * PowerNV OPAL Powercap interface
+ *
+ * Copyright 2017 IBM Corp.
+ *
+ * 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 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt)     "opal-powercap: " fmt
+
+#include <linux/of.h>
+#include <linux/kobject.h>
+#include <linux/slab.h>
+
+#include <asm/opal.h>
+
+DEFINE_MUTEX(powercap_mutex);
+
+static struct kobject *powercap_kobj;
+
+struct powercap_attr {
+	u32 handle;
+	struct kobj_attribute attr;
+};
+
+static struct attribute_group *pattr_groups;
+static struct powercap_attr *pcap_attrs;
+
+static ssize_t powercap_show(struct kobject *kobj, struct kobj_attribute *attr,
+			     char *buf)
+{
+	struct powercap_attr *pcap_attr = container_of(attr,
+						struct powercap_attr, attr);
+	struct opal_msg msg;
+	u32 pcap;
+	int ret, token;
+
+	token = opal_async_get_token_interruptible();
+	if (token < 0) {
+		pr_devel("Failed to get token\n");
+		return token;
+	}
+
+	mutex_lock(&powercap_mutex);
+	ret = opal_get_powercap(pcap_attr->handle, token, &pcap);
+	switch (ret) {
+	case OPAL_ASYNC_COMPLETION:
+		ret = opal_async_wait_response(token, &msg);
+		if (ret) {
+			pr_devel("Failed to wait for the async response %d\n",
+				 ret);
+			goto out;
+		}
+		ret = opal_error_code(opal_get_async_rc(msg));
+		if (!ret)
+			ret = sprintf(buf, "%u\n", be32_to_cpu(pcap));
+		break;
+	case OPAL_SUCCESS:
+		ret = sprintf(buf, "%u\n", be32_to_cpu(pcap));
+		break;
+	default:
+		ret = opal_error_code(ret);
+	}
+
+out:
+	mutex_unlock(&powercap_mutex);
+	opal_async_release_token(token);
+	return ret;
+}
+
+static ssize_t powercap_store(struct kobject *kobj,
+			      struct kobj_attribute *attr, const char *buf,
+			      size_t count)
+{
+	struct powercap_attr *pcap_attr = container_of(attr,
+						struct powercap_attr, attr);
+	struct opal_msg msg;
+	u32 pcap;
+	int ret, token;
+
+	ret = sscanf(buf, "%u", &pcap);
+	if (ret != 1)
+		return -EINVAL;
+
+	token = opal_async_get_token_interruptible();
+	if (token < 0) {
+		pr_devel("Failed to get token\n");
+		return token;
+	}
+
+	mutex_lock(&powercap_mutex);
+	ret = opal_set_powercap(pcap_attr->handle, token, pcap);
+	switch (ret) {
+	case OPAL_ASYNC_COMPLETION:
+		ret = opal_async_wait_response(token, &msg);
+		if (ret) {
+			pr_devel("Failed to wait for the async response %d\n",
+				 ret);
+			goto out;
+		}
+		ret = opal_error_code(opal_get_async_rc(msg));
+		if (!ret)
+			ret = count;
+		break;
+	case OPAL_SUCCESS:
+		ret = count;
+		break;
+	default:
+		ret = opal_error_code(ret);
+	}
+
+out:
+	mutex_unlock(&powercap_mutex);
+	opal_async_release_token(token);
+
+	return ret;
+}
+
+static void powercap_add_attr(int handle, const char *name,
+			      struct powercap_attr *attr)
+{
+	attr->handle = handle;
+	sysfs_attr_init(&attr->attr.attr);
+	attr->attr.attr.name = name;
+	attr->attr.attr.mode = 0444;
+	attr->attr.show = powercap_show;
+}
+
+void __init opal_powercap_init(void)
+{
+	struct device_node *powercap, *node;
+	int pattr_group_count = 0, total_attr_count = 0;
+	int i, count;
+
+	powercap = of_find_node_by_path("/ibm,opal/power-mgt/powercap");
+	if (!powercap) {
+		pr_devel("/ibm,opal/power-mgt/powercap node not found\n");
+		return;
+	}
+
+	for_each_child_of_node(powercap, node)
+		pattr_group_count++;
+
+	pattr_groups = kcalloc(pattr_group_count,
+			       sizeof(struct attribute_group), GFP_KERNEL);
+	if (!pattr_groups)
+		return;
+
+	i = 0;
+	for_each_child_of_node(powercap, node) {
+		int attr_count = 0;
+
+		if (of_find_property(node, "powercap-min", NULL))
+			attr_count++;
+		if (of_find_property(node, "powercap-max", NULL))
+			attr_count++;
+		if (of_find_property(node, "powercap-cur", NULL))
+			attr_count++;
+
+		total_attr_count += attr_count;
+		pattr_groups[i].attrs = kcalloc(attr_count + 1,
+						sizeof(struct attribute *),
+						GFP_KERNEL);
+		if (!pattr_groups[i].attrs) {
+			while (--i >= 0)
+				kfree(pattr_groups[i].attrs);
+			goto out_pattr_groups;
+		}
+		i++;
+	}
+
+	pcap_attrs = kcalloc(total_attr_count, sizeof(struct powercap_attr),
+			     GFP_KERNEL);
+	if (!pcap_attrs)
+		goto out_pattr_groups_attrs;
+
+	count = 0;
+	i = 0;
+	for_each_child_of_node(powercap, node) {
+		u32 handle;
+		int j = 0;
+
+		pattr_groups[i].name = node->name;
+
+		if (!of_property_read_u32(node, "powercap-min", &handle)) {
+			powercap_add_attr(handle, "powercap-min",
+					  &pcap_attrs[count]);
+			pattr_groups[i].attrs[j++] =
+				&pcap_attrs[count++].attr.attr;
+		}
+
+		if (!of_property_read_u32(node, "powercap-max", &handle)) {
+			powercap_add_attr(handle, "powercap-max",
+					  &pcap_attrs[count]);
+			pattr_groups[i].attrs[j++] =
+				&pcap_attrs[count++].attr.attr;
+		}
+
+		if (!of_property_read_u32(node, "powercap-cur", &handle)) {
+			powercap_add_attr(handle, "powercap-cur",
+					  &pcap_attrs[count]);
+			pcap_attrs[count].attr.attr.mode |= 0220;
+			pcap_attrs[count].attr.store = powercap_store;
+			pattr_groups[i].attrs[j++] =
+				&pcap_attrs[count++].attr.attr;
+		}
+		i++;
+	}
+
+	powercap_kobj = kobject_create_and_add("powercap", opal_kobj);
+	if (!powercap_kobj) {
+		pr_warn("Failed to create powercap kobject\n");
+		goto out_pcap_attrs;
+	}
+
+	for (i = 0; i < pattr_group_count; i++) {
+		if (sysfs_create_group(powercap_kobj, &pattr_groups[i])) {
+			pr_warn("Failed to create powercap attribute group %s\n",
+				pattr_groups[i].name);
+			goto out;
+		}
+	}
+
+	return;
+out:
+	kobject_put(powercap_kobj);
+out_pcap_attrs:
+	kfree(pcap_attrs);
+out_pattr_groups_attrs:
+	while (--pattr_group_count >= 0)
+		kfree(pattr_groups[i].attrs);
+out_pattr_groups:
+	kfree(pattr_groups);
+}
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index 4ca6c26..eff5fe7 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -310,3 +310,5 @@ OPAL_CALL(opal_xive_dump,			OPAL_XIVE_DUMP);
 OPAL_CALL(opal_npu_init_context,		OPAL_NPU_INIT_CONTEXT);
 OPAL_CALL(opal_npu_destroy_context,		OPAL_NPU_DESTROY_CONTEXT);
 OPAL_CALL(opal_npu_map_lpar,			OPAL_NPU_MAP_LPAR);
+OPAL_CALL(opal_get_powercap,			OPAL_GET_POWERCAP);
+OPAL_CALL(opal_set_powercap,			OPAL_SET_POWERCAP);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 9b87abb..d893cba 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -836,6 +836,9 @@ static int __init opal_init(void)
 	/* Initialise OPAL kmsg dumper for flushing console on panic */
 	opal_kmsg_init();
 
+	/* Initialise OPAL powercap interface */
+	opal_powercap_init();
+
 	return 0;
 }
 machine_subsys_initcall(powernv, opal_init);
@@ -952,6 +955,7 @@ int opal_error_code(int rc)
 	case OPAL_UNSUPPORTED:		return -EIO;
 	case OPAL_HARDWARE:		return -EIO;
 	case OPAL_INTERNAL_ERROR:	return -EIO;
+	case OPAL_TIMEOUT:		return -ETIMEDOUT;
 	default:
 		pr_err("%s: unexpected OPAL error %d\n", __func__, rc);
 		return -EIO;
-- 
1.8.3.1

[PATCH V7 2/3] powernv: Add support to set power-shifting-ratio

[Shilpasri G Bhat]

This patch adds support to set power-shifting-ratio for CPU-GPU which
is used by OCC power capping algorithm.

Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/opal-api.h            |   4 +-
 arch/powerpc/include/asm/opal.h                |   3 +
 arch/powerpc/platforms/powernv/Makefile        |   2 +-
 arch/powerpc/platforms/powernv/opal-psr.c      | 169 +++++++++++++++++++++++++
 arch/powerpc/platforms/powernv/opal-wrappers.S |   2 +
 arch/powerpc/platforms/powernv/opal.c          |   3 +
 6 files changed, 181 insertions(+), 2 deletions(-)
 create mode 100644 arch/powerpc/platforms/powernv/opal-psr.c

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index c3e0c4a..0d37315 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -193,7 +193,9 @@
 #define OPAL_NPU_MAP_LPAR			148
 #define OPAL_GET_POWERCAP			152
 #define OPAL_SET_POWERCAP			153
-#define OPAL_LAST				153
+#define OPAL_GET_PSR				154
+#define OPAL_SET_PSR				155
+#define OPAL_LAST				155
 
 /* Device tree flags */
 
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index ec2087c..58b30a4 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -269,6 +269,8 @@ int64_t opal_xive_set_vp_info(uint64_t vp,
 int64_t opal_xive_dump(uint32_t type, uint32_t id);
 int opal_get_powercap(u32 handle, int token, u32 *pcap);
 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);
 
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
@@ -348,6 +350,7 @@ static inline int opal_get_async_rc(struct opal_msg msg)
 void opal_wake_poller(void);
 
 void opal_powercap_init(void);
+void opal_psr_init(void);
 
 #endif /* __ASSEMBLY__ */
 
diff --git a/arch/powerpc/platforms/powernv/Makefile b/arch/powerpc/platforms/powernv/Makefile
index e79f806..9ed7d33 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
+obj-y			+= opal-kmsg.o opal-powercap.o opal-psr.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-psr.c b/arch/powerpc/platforms/powernv/opal-psr.c
new file mode 100644
index 0000000..ca98b181
--- /dev/null
+++ b/arch/powerpc/platforms/powernv/opal-psr.c
@@ -0,0 +1,169 @@
+/*
+ * PowerNV OPAL Power-Shifting-Ratio interface
+ *
+ * Copyright 2017 IBM Corp.
+ *
+ * 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 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt)     "opal-psr: " fmt
+
+#include <linux/of.h>
+#include <linux/kobject.h>
+#include <linux/slab.h>
+
+#include <asm/opal.h>
+
+DEFINE_MUTEX(psr_mutex);
+
+static struct kobject *psr_kobj;
+
+struct psr_attr {
+	u32 handle;
+	struct kobj_attribute attr;
+};
+
+static struct psr_attr *psr_attrs;
+static struct kobject *psr_kobj;
+
+static ssize_t psr_show(struct kobject *kobj, struct kobj_attribute *attr,
+			char *buf)
+{
+	struct psr_attr *psr_attr = container_of(attr, struct psr_attr, attr);
+	struct opal_msg msg;
+	int psr, ret, token;
+
+	token = opal_async_get_token_interruptible();
+	if (token < 0) {
+		pr_devel("Failed to get token\n");
+		return token;
+	}
+
+	mutex_lock(&psr_mutex);
+	ret = opal_get_power_shifting_ratio(psr_attr->handle, token, &psr);
+	switch (ret) {
+	case OPAL_ASYNC_COMPLETION:
+		ret = opal_async_wait_response(token, &msg);
+		if (ret) {
+			pr_devel("Failed to wait for the async response %d\n",
+				 ret);
+			goto out;
+		}
+		ret = opal_error_code(opal_get_async_rc(msg));
+		if (!ret)
+			ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
+		break;
+	case OPAL_SUCCESS:
+		ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
+		break;
+	default:
+		ret = opal_error_code(ret);
+	}
+
+out:
+	mutex_unlock(&psr_mutex);
+	opal_async_release_token(token);
+	return ret;
+}
+
+static ssize_t psr_store(struct kobject *kobj, struct kobj_attribute *attr,
+			 const char *buf, size_t count)
+{
+	struct psr_attr *psr_attr = container_of(attr, struct psr_attr, attr);
+	struct opal_msg msg;
+	int psr, ret, token;
+
+	ret = sscanf(buf, "%u", &psr);
+	if (ret != 1)
+		return -EINVAL;
+
+	token = opal_async_get_token_interruptible();
+	if (token < 0) {
+		pr_devel("Failed to get token\n");
+		return token;
+	}
+
+	mutex_lock(&psr_mutex);
+	ret = opal_set_power_shifting_ratio(psr_attr->handle, token, psr);
+	switch (ret) {
+	case OPAL_ASYNC_COMPLETION:
+		ret = opal_async_wait_response(token, &msg);
+		if (ret) {
+			pr_devel("Failed to wait for the async response %d\n",
+				 ret);
+			goto out;
+		}
+		ret = opal_error_code(opal_get_async_rc(msg));
+		if (!ret)
+			ret = count;
+		break;
+	case OPAL_SUCCESS:
+		ret = count;
+		break;
+	default:
+		ret = opal_error_code(ret);
+	}
+
+out:
+	mutex_unlock(&psr_mutex);
+	opal_async_release_token(token);
+
+	return ret;
+}
+
+void __init opal_psr_init(void)
+{
+	struct device_node *psr, *node;
+	int psr_attr_count = 0, i = 0;
+
+	psr = of_find_node_by_path("/ibm,opal/power-mgt/psr");
+	if (!psr) {
+		pr_devel("/ibm,opal/power-mgt/psr node not found\n");
+		return;
+	}
+
+	for_each_child_of_node(psr, node)
+		psr_attr_count++;
+
+	psr_attrs = kcalloc(psr_attr_count, sizeof(struct psr_attr),
+			    GFP_KERNEL);
+	if (!psr_attrs)
+		return;
+
+	for_each_child_of_node(psr, node) {
+		if (of_property_read_u32(node, "handle",
+					 &psr_attrs[i].handle))
+			goto out;
+
+		sysfs_attr_init(&psr_attrs[i].attr.attr);
+		if (of_property_read_string(node, "label",
+					    &psr_attrs[i].attr.attr.name))
+			goto out;
+		psr_attrs[i].attr.attr.mode = 0664;
+		psr_attrs[i].attr.show = psr_show;
+		psr_attrs[i].attr.store = psr_store;
+		i++;
+	}
+
+	psr_kobj = kobject_create_and_add("psr", opal_kobj);
+	if (!psr_kobj) {
+		pr_warn("Failed to create psr kobkect\n");
+		goto out;
+	}
+
+	for (i = 0; i < psr_attr_count; i++)
+		if (sysfs_create_file(psr_kobj, &psr_attrs[i].attr.attr)) {
+			pr_devel("Failed to create sysfs file %s\n",
+				 psr_attrs[i].attr.attr.name);
+			goto out_kobj;
+		}
+
+	return;
+out_kobj:
+	kobject_put(psr_kobj);
+out:
+	kfree(psr_attrs);
+}
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index eff5fe7..9867726 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -312,3 +312,5 @@ OPAL_CALL(opal_npu_destroy_context,		OPAL_NPU_DESTROY_CONTEXT);
 OPAL_CALL(opal_npu_map_lpar,			OPAL_NPU_MAP_LPAR);
 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);
diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index d893cba..f34033f 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -839,6 +839,9 @@ static int __init opal_init(void)
 	/* Initialise OPAL powercap interface */
 	opal_powercap_init();
 
+	/* Initialise OPAL Power-Shifting-Ratio interface */
+	opal_psr_init();
+
 	return 0;
 }
 machine_subsys_initcall(powernv, opal_init);
-- 
1.8.3.1

[PATCH V7 3/3] powernv : Add support to clear sensor groups data

[Shilpasri G Bhat]

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@linux.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