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author | Chris Metcalf <cmetcalf@tilera.com> | 2011-05-26 18:40:09 +0200 |
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committer | Chris Metcalf <cmetcalf@tilera.com> | 2011-05-27 16:39:05 +0200 |
commit | f133ecca9cbb31b5e6e9bda27cbe3034fbf656df (patch) | |
tree | 1887377b71ee9fc73d4e1226d1d9776ae5a5d7ad /arch/tile/kernel/sysfs.c | |
parent | Merge tag 'v2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds... (diff) | |
download | linux-f133ecca9cbb31b5e6e9bda27cbe3034fbf656df.tar.xz linux-f133ecca9cbb31b5e6e9bda27cbe3034fbf656df.zip |
arch/tile: more /proc and /sys file support
This change introduces a few of the less controversial /proc and
/proc/sys interfaces for tile, along with sysfs attributes for
various things that were originally proposed as /proc/tile files.
It also adjusts the "hardwall" proc API.
Arnd Bergmann reviewed the initial arch/tile submission, which
included a complete set of all the /proc/tile and /proc/sys/tile
knobs that we had added in a somewhat ad hoc way during initial
development, and provided feedback on where most of them should go.
One knob turned out to be similar enough to the existing
/proc/sys/debug/exception-trace that it was re-implemented to use
that model instead.
Another knob was /proc/tile/grid, which reported the "grid" dimensions
of a tile chip (e.g. 8x8 processors = 64-core chip). Arnd suggested
looking at sysfs for that, so this change moves that information
to a pair of sysfs attributes (chip_width and chip_height) in the
/sys/devices/system/cpu directory. We also put the "chip_serial"
and "chip_revision" information from our old /proc/tile/board file
as attributes in /sys/devices/system/cpu.
Other information collected via hypervisor APIs is now placed in
/sys/hypervisor. We create a /sys/hypervisor/type file (holding the
constant string "tilera") to be parallel with the Xen use of
/sys/hypervisor/type holding "xen". We create three top-level files,
"version" (the hypervisor's own version), "config_version" (the
version of the configuration file), and "hvconfig" (the contents of
the configuration file). The remaining information from our old
/proc/tile/board and /proc/tile/switch files becomes an attribute
group appearing under /sys/hypervisor/board/.
Finally, after some feedback from Arnd Bergmann for the previous
version of this patch, the /proc/tile/hardwall file is split up into
two conceptual parts. First, a directory /proc/tile/hardwall/ which
contains one file per active hardwall, each file named after the
hardwall's ID and holding a cpulist that says which cpus are enclosed by
the hardwall. Second, a /proc/PID file "hardwall" that is either
empty (for non-hardwall-using processes) or contains the hardwall ID.
Finally, this change pushes the /proc/sys/tile/unaligned_fixup/
directory, with knobs controlling the kernel code for handling the
fixup of unaligned exceptions.
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/kernel/sysfs.c')
-rw-r--r-- | arch/tile/kernel/sysfs.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/tile/kernel/sysfs.c b/arch/tile/kernel/sysfs.c new file mode 100644 index 000000000000..b671a86f4515 --- /dev/null +++ b/arch/tile/kernel/sysfs.c @@ -0,0 +1,185 @@ +/* + * 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/sysdev.h> +#include <linux/cpu.h> +#include <linux/slab.h> +#include <linux/smp.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 sysdev_class *dev, + struct sysdev_class_attribute *attr, + char *page) +{ + return sprintf(page, "%u\n", smp_width); +} +static SYSDEV_CLASS_ATTR(chip_width, 0444, chip_width_show, NULL); + +static ssize_t chip_height_show(struct sysdev_class *dev, + struct sysdev_class_attribute *attr, + char *page) +{ + return sprintf(page, "%u\n", smp_height); +} +static SYSDEV_CLASS_ATTR(chip_height, 0444, chip_height_show, NULL); + +static ssize_t chip_serial_show(struct sysdev_class *dev, + struct sysdev_class_attribute *attr, + char *page) +{ + return get_hv_confstr(page, HV_CONFSTR_CHIP_SERIAL_NUM); +} +static SYSDEV_CLASS_ATTR(chip_serial, 0444, chip_serial_show, NULL); + +static ssize_t chip_revision_show(struct sysdev_class *dev, + struct sysdev_class_attribute *attr, + char *page) +{ + return get_hv_confstr(page, HV_CONFSTR_CHIP_REV); +} +static SYSDEV_CLASS_ATTR(chip_revision, 0444, chip_revision_show, NULL); + + +static ssize_t type_show(struct sysdev_class *dev, + struct sysdev_class_attribute *attr, + char *page) +{ + return sprintf(page, "tilera\n"); +} +static SYSDEV_CLASS_ATTR(type, 0444, type_show, NULL); + +#define HV_CONF_ATTR(name, conf) \ + static ssize_t name ## _show(struct sysdev_class *dev, \ + struct sysdev_class_attribute *attr, \ + char *page) \ + { \ + return get_hv_confstr(page, conf); \ + } \ + static SYSDEV_CLASS_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(switch_control, HV_CONFSTR_SWITCH_CONTROL) + +static struct attribute *board_attrs[] = { + &attr_board_part.attr, + &attr_board_serial.attr, + &attr_board_revision.attr, + &attr_board_description.attr, + &attr_mezz_part.attr, + &attr_mezz_serial.attr, + &attr_mezz_revision.attr, + &attr_mezz_description.attr, + &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 int __init create_sysfs_entries(void) +{ + struct sysdev_class *cls = &cpu_sysdev_class; + int err = 0; + +#define create_cpu_attr(name) \ + if (!err) \ + err = sysfs_create_file(&cls->kset.kobj, &attr_##name.attr); + 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, &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); + } + + return err; +} +subsys_initcall(create_sysfs_entries); |