diff options
Diffstat (limited to 'arch/tile/kernel/sysfs.c')
| -rw-r--r-- | arch/tile/kernel/sysfs.c | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/arch/tile/kernel/sysfs.c b/arch/tile/kernel/sysfs.c new file mode 100644 index 000000000..a3ed12f8f --- /dev/null +++ b/arch/tile/kernel/sysfs.c @@ -0,0 +1,269 @@ +/* + * Copyright 2011 Tilera Corporation. All Rights Reserved. + * + * 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, version 2. + * + * 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, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + * + * /sys entry support. + */ + +#include <linux/device.h> +#include <linux/cpu.h> +#include <linux/slab.h> +#include <linux/smp.h> +#include <linux/stat.h> +#include <hv/hypervisor.h> + +/* Return a string queried from the hypervisor, truncated to page size. */ +static ssize_t get_hv_confstr(char *page, int query) +{ + ssize_t n = hv_confstr(query, (unsigned long)page, PAGE_SIZE - 1); + n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1) - 1; + if (n) + page[n++] = '\n'; + page[n] = '\0'; + return n; +} + +static ssize_t chip_width_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + return sprintf(page, "%u\n", smp_width); +} +static DEVICE_ATTR(chip_width, 0444, chip_width_show, NULL); + +static ssize_t chip_height_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + return sprintf(page, "%u\n", smp_height); +} +static DEVICE_ATTR(chip_height, 0444, chip_height_show, NULL); + +static ssize_t chip_serial_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + return get_hv_confstr(page, HV_CONFSTR_CHIP_SERIAL_NUM); +} +static DEVICE_ATTR(chip_serial, 0444, chip_serial_show, NULL); + +static ssize_t chip_revision_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + return get_hv_confstr(page, HV_CONFSTR_CHIP_REV); +} +static DEVICE_ATTR(chip_revision, 0444, chip_revision_show, NULL); + + +static ssize_t type_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + return sprintf(page, "tilera\n"); +} +static DEVICE_ATTR(type, 0444, type_show, NULL); + +#define HV_CONF_ATTR(name, conf) \ + static ssize_t name ## _show(struct device *dev, \ + struct device_attribute *attr, \ + char *page) \ + { \ + return get_hv_confstr(page, conf); \ + } \ + static DEVICE_ATTR(name, 0444, name ## _show, NULL); + +HV_CONF_ATTR(version, HV_CONFSTR_HV_SW_VER) +HV_CONF_ATTR(config_version, HV_CONFSTR_HV_CONFIG_VER) + +HV_CONF_ATTR(board_part, HV_CONFSTR_BOARD_PART_NUM) +HV_CONF_ATTR(board_serial, HV_CONFSTR_BOARD_SERIAL_NUM) +HV_CONF_ATTR(board_revision, HV_CONFSTR_BOARD_REV) +HV_CONF_ATTR(board_description, HV_CONFSTR_BOARD_DESC) +HV_CONF_ATTR(mezz_part, HV_CONFSTR_MEZZ_PART_NUM) +HV_CONF_ATTR(mezz_serial, HV_CONFSTR_MEZZ_SERIAL_NUM) +HV_CONF_ATTR(mezz_revision, HV_CONFSTR_MEZZ_REV) +HV_CONF_ATTR(mezz_description, HV_CONFSTR_MEZZ_DESC) +HV_CONF_ATTR(cpumod_part, HV_CONFSTR_CPUMOD_PART_NUM) +HV_CONF_ATTR(cpumod_serial, HV_CONFSTR_CPUMOD_SERIAL_NUM) +HV_CONF_ATTR(cpumod_revision, HV_CONFSTR_CPUMOD_REV) +HV_CONF_ATTR(cpumod_description,HV_CONFSTR_CPUMOD_DESC) +HV_CONF_ATTR(switch_control, HV_CONFSTR_SWITCH_CONTROL) + +static struct attribute *board_attrs[] = { + &dev_attr_board_part.attr, + &dev_attr_board_serial.attr, + &dev_attr_board_revision.attr, + &dev_attr_board_description.attr, + &dev_attr_mezz_part.attr, + &dev_attr_mezz_serial.attr, + &dev_attr_mezz_revision.attr, + &dev_attr_mezz_description.attr, + &dev_attr_cpumod_part.attr, + &dev_attr_cpumod_serial.attr, + &dev_attr_cpumod_revision.attr, + &dev_attr_cpumod_description.attr, + &dev_attr_switch_control.attr, + NULL +}; + +static struct attribute_group board_attr_group = { + .name = "board", + .attrs = board_attrs, +}; + + +static struct bin_attribute hvconfig_bin; + +static ssize_t +hvconfig_bin_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + static size_t size; + + /* Lazily learn the true size (minus the trailing NUL). */ + if (size == 0) + size = hv_confstr(HV_CONFSTR_HV_CONFIG, 0, 0) - 1; + + /* Check and adjust input parameters. */ + if (off > size) + return -EINVAL; + if (count > size - off) + count = size - off; + + if (count) { + /* Get a copy of the hvc and copy out the relevant portion. */ + char *hvc; + + size = off + count; + hvc = kmalloc(size, GFP_KERNEL); + if (hvc == NULL) + return -ENOMEM; + hv_confstr(HV_CONFSTR_HV_CONFIG, (unsigned long)hvc, size); + memcpy(buf, hvc + off, count); + kfree(hvc); + } + + return count; +} + +static ssize_t hv_stats_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + int cpu = dev->id; + long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu)); + + ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS, + (unsigned long)page, PAGE_SIZE - 1, + lotar, 0); + n = n < 0 ? 0 : min(n, (ssize_t)PAGE_SIZE - 1); + page[n] = '\0'; + return n; +} + +static ssize_t hv_stats_store(struct device *dev, + struct device_attribute *attr, + const char *page, + size_t count) +{ + int cpu = dev->id; + long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu)); + + ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS, 0, 0, lotar, 1); + return n < 0 ? n : count; +} + +static DEVICE_ATTR(hv_stats, 0644, hv_stats_show, hv_stats_store); + +static int hv_stats_device_add(struct device *dev, struct subsys_interface *sif) +{ + int err, cpu = dev->id; + + if (!cpu_online(cpu)) + return 0; + + err = sysfs_create_file(&dev->kobj, &dev_attr_hv_stats.attr); + + return err; +} + +static int hv_stats_device_remove(struct device *dev, + struct subsys_interface *sif) +{ + int cpu = dev->id; + + if (!cpu_online(cpu)) + return 0; + + sysfs_remove_file(&dev->kobj, &dev_attr_hv_stats.attr); + return 0; +} + + +static struct subsys_interface hv_stats_interface = { + .name = "hv_stats", + .subsys = &cpu_subsys, + .add_dev = hv_stats_device_add, + .remove_dev = hv_stats_device_remove, +}; + +static int __init create_sysfs_entries(void) +{ + int err = 0; + +#define create_cpu_attr(name) \ + if (!err) \ + err = device_create_file(cpu_subsys.dev_root, &dev_attr_##name); + create_cpu_attr(chip_width); + create_cpu_attr(chip_height); + create_cpu_attr(chip_serial); + create_cpu_attr(chip_revision); + +#define create_hv_attr(name) \ + if (!err) \ + err = sysfs_create_file(hypervisor_kobj, &dev_attr_##name.attr); + create_hv_attr(type); + create_hv_attr(version); + create_hv_attr(config_version); + + if (!err) + err = sysfs_create_group(hypervisor_kobj, &board_attr_group); + + if (!err) { + sysfs_bin_attr_init(&hvconfig_bin); + hvconfig_bin.attr.name = "hvconfig"; + hvconfig_bin.attr.mode = S_IRUGO; + hvconfig_bin.read = hvconfig_bin_read; + hvconfig_bin.size = PAGE_SIZE; + err = sysfs_create_bin_file(hypervisor_kobj, &hvconfig_bin); + } + + if (!err) { + /* + * Don't bother adding the hv_stats files on each CPU if + * our hypervisor doesn't supply statistics. + */ + int cpu = raw_smp_processor_id(); + long lotar = HV_XY_TO_LOTAR(cpu_x(cpu), cpu_y(cpu)); + char dummy; + ssize_t n = hv_confstr(HV_CONFSTR_HV_STATS, + (unsigned long) &dummy, 1, + lotar, 0); + if (n >= 0) + err = subsys_interface_register(&hv_stats_interface); + } + + return err; +} +subsys_initcall(create_sysfs_entries); |