[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@xxxxxxxxxxxxxxxxxx>
---
 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