![Viresh Kumar](/assets/img/avatar_default.png)
Its return value is not used by the subsys core and nothing meaningful can be done with it, even if we want to use it. The subsys device is anyway getting removed. Update prototype of ->remove_dev() to make its return type as void. Fix all usage sites as well. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
267 lines
7.1 KiB
C
267 lines
7.1 KiB
C
/*
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* Copyright 2011 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* /sys entry support.
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*/
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#include <linux/device.h>
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#include <linux/cpu.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/stat.h>
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#include <hv/hypervisor.h>
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/* Return a string queried from the hypervisor, truncated to page size. */
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static ssize_t get_hv_confstr(char *page, int query)
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{
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ssize_t n = hv_confstr(query, (unsigned long)page, PAGE_SIZE - 1);
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n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1) - 1;
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if (n)
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page[n++] = '\n';
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page[n] = '\0';
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return n;
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}
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static ssize_t chip_width_show(struct device *dev,
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struct device_attribute *attr,
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char *page)
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{
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return sprintf(page, "%u\n", smp_width);
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}
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static DEVICE_ATTR(chip_width, 0444, chip_width_show, NULL);
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static ssize_t chip_height_show(struct device *dev,
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struct device_attribute *attr,
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char *page)
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{
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return sprintf(page, "%u\n", smp_height);
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}
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static DEVICE_ATTR(chip_height, 0444, chip_height_show, NULL);
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static ssize_t chip_serial_show(struct device *dev,
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struct device_attribute *attr,
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char *page)
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{
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return get_hv_confstr(page, HV_CONFSTR_CHIP_SERIAL_NUM);
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}
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static DEVICE_ATTR(chip_serial, 0444, chip_serial_show, NULL);
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static ssize_t chip_revision_show(struct device *dev,
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struct device_attribute *attr,
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char *page)
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{
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return get_hv_confstr(page, HV_CONFSTR_CHIP_REV);
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}
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static DEVICE_ATTR(chip_revision, 0444, chip_revision_show, NULL);
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static ssize_t type_show(struct device *dev,
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struct device_attribute *attr,
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char *page)
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{
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return sprintf(page, "tilera\n");
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}
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static DEVICE_ATTR(type, 0444, type_show, NULL);
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#define HV_CONF_ATTR(name, conf) \
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static ssize_t name ## _show(struct device *dev, \
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struct device_attribute *attr, \
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char *page) \
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{ \
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return get_hv_confstr(page, conf); \
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} \
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static DEVICE_ATTR(name, 0444, name ## _show, NULL);
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HV_CONF_ATTR(version, HV_CONFSTR_HV_SW_VER)
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HV_CONF_ATTR(config_version, HV_CONFSTR_HV_CONFIG_VER)
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HV_CONF_ATTR(board_part, HV_CONFSTR_BOARD_PART_NUM)
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HV_CONF_ATTR(board_serial, HV_CONFSTR_BOARD_SERIAL_NUM)
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HV_CONF_ATTR(board_revision, HV_CONFSTR_BOARD_REV)
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HV_CONF_ATTR(board_description, HV_CONFSTR_BOARD_DESC)
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HV_CONF_ATTR(mezz_part, HV_CONFSTR_MEZZ_PART_NUM)
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HV_CONF_ATTR(mezz_serial, HV_CONFSTR_MEZZ_SERIAL_NUM)
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HV_CONF_ATTR(mezz_revision, HV_CONFSTR_MEZZ_REV)
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HV_CONF_ATTR(mezz_description, HV_CONFSTR_MEZZ_DESC)
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HV_CONF_ATTR(cpumod_part, HV_CONFSTR_CPUMOD_PART_NUM)
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HV_CONF_ATTR(cpumod_serial, HV_CONFSTR_CPUMOD_SERIAL_NUM)
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HV_CONF_ATTR(cpumod_revision, HV_CONFSTR_CPUMOD_REV)
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HV_CONF_ATTR(cpumod_description,HV_CONFSTR_CPUMOD_DESC)
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HV_CONF_ATTR(switch_control, HV_CONFSTR_SWITCH_CONTROL)
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static struct attribute *board_attrs[] = {
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&dev_attr_board_part.attr,
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&dev_attr_board_serial.attr,
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&dev_attr_board_revision.attr,
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&dev_attr_board_description.attr,
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&dev_attr_mezz_part.attr,
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&dev_attr_mezz_serial.attr,
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&dev_attr_mezz_revision.attr,
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&dev_attr_mezz_description.attr,
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&dev_attr_cpumod_part.attr,
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&dev_attr_cpumod_serial.attr,
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&dev_attr_cpumod_revision.attr,
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&dev_attr_cpumod_description.attr,
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&dev_attr_switch_control.attr,
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NULL
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};
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static struct attribute_group board_attr_group = {
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.name = "board",
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.attrs = board_attrs,
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};
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static struct bin_attribute hvconfig_bin;
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static ssize_t
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hvconfig_bin_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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static size_t size;
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/* Lazily learn the true size (minus the trailing NUL). */
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if (size == 0)
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size = hv_confstr(HV_CONFSTR_HV_CONFIG, 0, 0) - 1;
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/* Check and adjust input parameters. */
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if (off > size)
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return -EINVAL;
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if (count > size - off)
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count = size - off;
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if (count) {
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/* Get a copy of the hvc and copy out the relevant portion. */
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char *hvc;
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size = off + count;
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hvc = kmalloc(size, GFP_KERNEL);
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if (hvc == NULL)
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return -ENOMEM;
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hv_confstr(HV_CONFSTR_HV_CONFIG, (unsigned long)hvc, size);
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memcpy(buf, hvc + off, count);
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kfree(hvc);
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}
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return count;
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}
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static ssize_t hv_stats_show(struct device *dev,
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struct device_attribute *attr,
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char *page)
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{
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int cpu = dev->id;
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long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
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ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS,
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(unsigned long)page, PAGE_SIZE - 1,
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lotar, 0);
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n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1);
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page[n] = '\0';
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return n;
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}
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static ssize_t hv_stats_store(struct device *dev,
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struct device_attribute *attr,
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const char *page,
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size_t count)
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{
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int cpu = dev->id;
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long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
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ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS, 0, 0, lotar, 1);
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return n < 0 ? n : count;
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}
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static DEVICE_ATTR(hv_stats, 0644, hv_stats_show, hv_stats_store);
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static int hv_stats_device_add(struct device *dev, struct subsys_interface *sif)
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{
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int err, cpu = dev->id;
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if (!cpu_online(cpu))
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return 0;
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err = sysfs_create_file(&dev->kobj, &dev_attr_hv_stats.attr);
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return err;
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}
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static void hv_stats_device_remove(struct device *dev,
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struct subsys_interface *sif)
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{
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int cpu = dev->id;
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if (cpu_online(cpu))
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sysfs_remove_file(&dev->kobj, &dev_attr_hv_stats.attr);
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}
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static struct subsys_interface hv_stats_interface = {
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.name = "hv_stats",
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.subsys = &cpu_subsys,
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.add_dev = hv_stats_device_add,
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.remove_dev = hv_stats_device_remove,
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};
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static int __init create_sysfs_entries(void)
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{
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int err = 0;
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#define create_cpu_attr(name) \
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if (!err) \
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err = device_create_file(cpu_subsys.dev_root, &dev_attr_##name);
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create_cpu_attr(chip_width);
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create_cpu_attr(chip_height);
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create_cpu_attr(chip_serial);
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create_cpu_attr(chip_revision);
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#define create_hv_attr(name) \
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if (!err) \
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err = sysfs_create_file(hypervisor_kobj, &dev_attr_##name.attr);
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create_hv_attr(type);
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create_hv_attr(version);
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create_hv_attr(config_version);
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if (!err)
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err = sysfs_create_group(hypervisor_kobj, &board_attr_group);
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if (!err) {
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sysfs_bin_attr_init(&hvconfig_bin);
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hvconfig_bin.attr.name = "hvconfig";
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hvconfig_bin.attr.mode = S_IRUGO;
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hvconfig_bin.read = hvconfig_bin_read;
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hvconfig_bin.size = PAGE_SIZE;
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err = sysfs_create_bin_file(hypervisor_kobj, &hvconfig_bin);
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}
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if (!err) {
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/*
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* Don't bother adding the hv_stats files on each CPU if
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* our hypervisor doesn't supply statistics.
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*/
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int cpu = raw_smp_processor_id();
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long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu));
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char dummy;
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ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS,
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(unsigned long) &dummy, 1,
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lotar, 0);
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if (n >= 0)
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err = subsys_interface_register(&hv_stats_interface);
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}
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return err;
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}
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subsys_initcall(create_sysfs_entries);
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