172 строки
3.5 KiB
C
172 строки
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* PowerNV OPAL Power-Shift-Ratio interface
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*
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* Copyright 2017 IBM Corp.
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*/
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#define pr_fmt(fmt) "opal-psr: " fmt
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#include <linux/of.h>
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#include <linux/kobject.h>
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#include <linux/slab.h>
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#include <asm/opal.h>
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DEFINE_MUTEX(psr_mutex);
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static struct kobject *psr_kobj;
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struct psr_attr {
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u32 handle;
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struct kobj_attribute attr;
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} *psr_attrs;
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static ssize_t psr_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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struct psr_attr *psr_attr = container_of(attr, struct psr_attr, attr);
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struct opal_msg msg;
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int psr, ret, token;
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token = opal_async_get_token_interruptible();
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if (token < 0) {
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pr_devel("Failed to get token\n");
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return token;
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}
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ret = mutex_lock_interruptible(&psr_mutex);
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if (ret)
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goto out_token;
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ret = opal_get_power_shift_ratio(psr_attr->handle, token,
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(u32 *)__pa(&psr));
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switch (ret) {
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case OPAL_ASYNC_COMPLETION:
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ret = opal_async_wait_response(token, &msg);
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if (ret) {
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pr_devel("Failed to wait for the async response\n");
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ret = -EIO;
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goto out;
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}
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ret = opal_error_code(opal_get_async_rc(msg));
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if (!ret) {
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ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
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if (ret < 0)
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ret = -EIO;
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}
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break;
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case OPAL_SUCCESS:
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ret = sprintf(buf, "%u\n", be32_to_cpu(psr));
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if (ret < 0)
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ret = -EIO;
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break;
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default:
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ret = opal_error_code(ret);
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}
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out:
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mutex_unlock(&psr_mutex);
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out_token:
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opal_async_release_token(token);
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return ret;
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}
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static ssize_t psr_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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struct psr_attr *psr_attr = container_of(attr, struct psr_attr, attr);
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struct opal_msg msg;
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int psr, ret, token;
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ret = kstrtoint(buf, 0, &psr);
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if (ret)
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return ret;
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token = opal_async_get_token_interruptible();
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if (token < 0) {
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pr_devel("Failed to get token\n");
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return token;
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}
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ret = mutex_lock_interruptible(&psr_mutex);
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if (ret)
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goto out_token;
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ret = opal_set_power_shift_ratio(psr_attr->handle, token, psr);
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switch (ret) {
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case OPAL_ASYNC_COMPLETION:
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ret = opal_async_wait_response(token, &msg);
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if (ret) {
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pr_devel("Failed to wait for the async response\n");
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ret = -EIO;
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goto out;
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}
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ret = opal_error_code(opal_get_async_rc(msg));
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if (!ret)
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ret = count;
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break;
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case OPAL_SUCCESS:
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ret = count;
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break;
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default:
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ret = opal_error_code(ret);
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}
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out:
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mutex_unlock(&psr_mutex);
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out_token:
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opal_async_release_token(token);
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return ret;
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}
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void __init opal_psr_init(void)
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{
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struct device_node *psr, *node;
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int i = 0;
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psr = of_find_compatible_node(NULL, NULL,
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"ibm,opal-power-shift-ratio");
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if (!psr) {
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pr_devel("Power-shift-ratio node not found\n");
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return;
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}
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psr_attrs = kcalloc(of_get_child_count(psr), sizeof(*psr_attrs),
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GFP_KERNEL);
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if (!psr_attrs)
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return;
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psr_kobj = kobject_create_and_add("psr", opal_kobj);
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if (!psr_kobj) {
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pr_warn("Failed to create psr kobject\n");
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goto out;
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}
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for_each_child_of_node(psr, node) {
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if (of_property_read_u32(node, "handle",
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&psr_attrs[i].handle))
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goto out_kobj;
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sysfs_attr_init(&psr_attrs[i].attr.attr);
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if (of_property_read_string(node, "label",
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&psr_attrs[i].attr.attr.name))
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goto out_kobj;
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psr_attrs[i].attr.attr.mode = 0664;
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psr_attrs[i].attr.show = psr_show;
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psr_attrs[i].attr.store = psr_store;
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if (sysfs_create_file(psr_kobj, &psr_attrs[i].attr.attr)) {
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pr_devel("Failed to create psr sysfs file %s\n",
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psr_attrs[i].attr.attr.name);
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goto out_kobj;
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}
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i++;
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}
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return;
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out_kobj:
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kobject_put(psr_kobj);
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out:
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kfree(psr_attrs);
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}
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