powerpc/powernv: Add support to set power-shifting-ratio (8e84b2d1) · Commits · 戴 / test

Documentation/ABI/testing/sysfs-firmware-opal-psr

0 → 100644

+18 −0

Original line number	Diff line number	Diff line
		What: /sys/firmware/opal/psr
		Date: August 2017
		Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
		Description: Power-Shift-Ratio directory for Powernv P9 servers

		Power-Shift-Ratio allows to provide hints the firmware
		to shift/throttle power between different entities in
		the system. Each attribute in this directory indicates
		a settable PSR.

		What: /sys/firmware/opal/psr/cpu_to_gpu_X
		Date: August 2017
		Contact: Linux for PowerPC mailing list <linuxppc-dev@ozlabs.org>
		Description: PSR sysfs attributes for Powernv P9 servers

		Power-Shift-Ratio between CPU and GPU for a given chip
		with chip-id X. This file gives the ratio (0-100)
		which is used by OCC for power-capping.

arch/powerpc/include/asm/opal-api.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -196,6 +196,8 @@
		#define OPAL_IMC_COUNTERS_STOP 151
		#define OPAL_GET_POWERCAP 152
		#define OPAL_SET_POWERCAP 153
		#define OPAL_GET_POWER_SHIFT_RATIO 154
		#define OPAL_SET_POWER_SHIFT_RATIO 155
		#define OPAL_PCI_SET_P2P 157
		#define OPAL_LAST 157

arch/powerpc/include/asm/opal.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -277,6 +277,8 @@ int64_t opal_imc_counters_stop(uint32_t type, uint64_t cpu_pir);

		int opal_get_powercap(u32 handle, int token, u32 *pcap);
		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);

		/* Internal functions */
		extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
		@@ -356,6 +358,7 @@ 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__ */

arch/powerpc/platforms/powernv/Makefile

+1 −1

Original line number	Diff line number	Diff line
		@@ -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

arch/powerpc/platforms/powernv/opal-psr.c

0 → 100644

+175 −0

Original line number	Diff line number	Diff line
		/*
		* PowerNV OPAL Power-Shift-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;
		} *psr_attrs;

		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;
		}

		ret = mutex_lock_interruptible(&psr_mutex);
		if (ret)
		goto out_token;

		ret = opal_get_power_shift_ratio(psr_attr->handle, token,
		(u32 *)__pa(&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\n");
		ret = -EIO;
		goto out;
		}
		ret = opal_error_code(opal_get_async_rc(msg));
		if (!ret) {
		ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
		if (ret < 0)
		ret = -EIO;
		}
		break;
		case OPAL_SUCCESS:
		ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
		if (ret < 0)
		ret = -EIO;
		break;
		default:
		ret = opal_error_code(ret);
		}

		out:
		mutex_unlock(&psr_mutex);
		out_token:
		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 = kstrtoint(buf, 0, &psr);
		if (ret)
		return ret;

		token = opal_async_get_token_interruptible();
		if (token < 0) {
		pr_devel("Failed to get token\n");
		return token;
		}

		ret = mutex_lock_interruptible(&psr_mutex);
		if (ret)
		goto out_token;

		ret = opal_set_power_shift_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\n");
		ret = -EIO;
		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);
		out_token:
		opal_async_release_token(token);
		return ret;
		}

		void __init opal_psr_init(void)
		{
		struct device_node psr, node;
		int i = 0;

		psr = of_find_compatible_node(NULL, NULL,
		"ibm,opal-power-shift-ratio");
		if (!psr) {
		pr_devel("Power-shift-ratio node not found\n");
		return;
		}

		psr_attrs = kcalloc(of_get_child_count(psr), sizeof(struct psr_attr),
		GFP_KERNEL);
		if (!psr_attrs)
		return;

		psr_kobj = kobject_create_and_add("psr", opal_kobj);
		if (!psr_kobj) {
		pr_warn("Failed to create psr kobject\n");
		goto out;
		}

		for_each_child_of_node(psr, node) {
		if (of_property_read_u32(node, "handle",
		&psr_attrs[i].handle))
		goto out_kobj;

		sysfs_attr_init(&psr_attrs[i].attr.attr);
		if (of_property_read_string(node, "label",
		&psr_attrs[i].attr.attr.name))
		goto out_kobj;
		psr_attrs[i].attr.attr.mode = 0664;
		psr_attrs[i].attr.show = psr_show;
		psr_attrs[i].attr.store = psr_store;
		if (sysfs_create_file(psr_kobj, &psr_attrs[i].attr.attr)) {
		pr_devel("Failed to create psr sysfs file %s\n",
		psr_attrs[i].attr.attr.name);
		goto out_kobj;
		}
		i++;
		}

		return;
		out_kobj:
		kobject_put(psr_kobj);
		out:
		kfree(psr_attrs);
		}

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