![Mario Limonciello](/assets/img/avatar_default.png)
Some Dell servers can use dell-smbios but they don't support the token interface. Make it optional. Signed-off-by: Mario Limonciello <mario.limonciello@dell.com> Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
655 lines
17 KiB
C
655 lines
17 KiB
C
/*
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* Common functions for kernel modules using Dell SMBIOS
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*
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* Copyright (c) Red Hat <mjg@redhat.com>
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* Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com>
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* Copyright (c) 2014 Pali Rohár <pali.rohar@gmail.com>
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*
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* Based on documentation in the libsmbios package:
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* Copyright (C) 2005-2014 Dell Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/capability.h>
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#include <linux/dmi.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include "dell-smbios.h"
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static u32 da_supported_commands;
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static int da_num_tokens;
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static struct platform_device *platform_device;
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static struct calling_interface_token *da_tokens;
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static struct device_attribute *token_location_attrs;
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static struct device_attribute *token_value_attrs;
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static struct attribute **token_attrs;
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static DEFINE_MUTEX(smbios_mutex);
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struct smbios_device {
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struct list_head list;
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struct device *device;
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int (*call_fn)(struct calling_interface_buffer *arg);
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};
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struct smbios_call {
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u32 need_capability;
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int cmd_class;
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int cmd_select;
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};
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/* calls that are whitelisted for given capabilities */
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static struct smbios_call call_whitelist[] = {
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/* generally tokens are allowed, but may be further filtered or
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* restricted by token blacklist or whitelist
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*/
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{CAP_SYS_ADMIN, CLASS_TOKEN_READ, SELECT_TOKEN_STD},
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{CAP_SYS_ADMIN, CLASS_TOKEN_READ, SELECT_TOKEN_AC},
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{CAP_SYS_ADMIN, CLASS_TOKEN_READ, SELECT_TOKEN_BAT},
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{CAP_SYS_ADMIN, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD},
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{CAP_SYS_ADMIN, CLASS_TOKEN_WRITE, SELECT_TOKEN_AC},
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{CAP_SYS_ADMIN, CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT},
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/* used by userspace: fwupdate */
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{CAP_SYS_ADMIN, CLASS_ADMIN_PROP, SELECT_ADMIN_PROP},
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/* used by userspace: fwupd */
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{CAP_SYS_ADMIN, CLASS_INFO, SELECT_DOCK},
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{CAP_SYS_ADMIN, CLASS_FLASH_INTERFACE, SELECT_FLASH_INTERFACE},
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};
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/* calls that are explicitly blacklisted */
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static struct smbios_call call_blacklist[] = {
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{0x0000, 1, 7}, /* manufacturing use */
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{0x0000, 6, 5}, /* manufacturing use */
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{0x0000, 11, 3}, /* write once */
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{0x0000, 11, 7}, /* write once */
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{0x0000, 11, 11}, /* write once */
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{0x0000, 19, -1}, /* diagnostics */
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/* handled by kernel: dell-laptop */
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{0x0000, CLASS_INFO, SELECT_RFKILL},
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{0x0000, CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT},
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};
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struct token_range {
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u32 need_capability;
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u16 min;
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u16 max;
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};
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/* tokens that are whitelisted for given capabilities */
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static struct token_range token_whitelist[] = {
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/* used by userspace: fwupdate */
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{CAP_SYS_ADMIN, CAPSULE_EN_TOKEN, CAPSULE_DIS_TOKEN},
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/* can indicate to userspace that WMI is needed */
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{0x0000, WSMT_EN_TOKEN, WSMT_DIS_TOKEN}
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};
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/* tokens that are explicitly blacklisted */
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static struct token_range token_blacklist[] = {
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{0x0000, 0x0058, 0x0059}, /* ME use */
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{0x0000, 0x00CD, 0x00D0}, /* raid shadow copy */
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{0x0000, 0x013A, 0x01FF}, /* sata shadow copy */
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{0x0000, 0x0175, 0x0176}, /* write once */
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{0x0000, 0x0195, 0x0197}, /* diagnostics */
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{0x0000, 0x01DC, 0x01DD}, /* manufacturing use */
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{0x0000, 0x027D, 0x0284}, /* diagnostics */
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{0x0000, 0x02E3, 0x02E3}, /* manufacturing use */
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{0x0000, 0x02FF, 0x02FF}, /* manufacturing use */
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{0x0000, 0x0300, 0x0302}, /* manufacturing use */
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{0x0000, 0x0325, 0x0326}, /* manufacturing use */
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{0x0000, 0x0332, 0x0335}, /* fan control */
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{0x0000, 0x0350, 0x0350}, /* manufacturing use */
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{0x0000, 0x0363, 0x0363}, /* manufacturing use */
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{0x0000, 0x0368, 0x0368}, /* manufacturing use */
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{0x0000, 0x03F6, 0x03F7}, /* manufacturing use */
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{0x0000, 0x049E, 0x049F}, /* manufacturing use */
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{0x0000, 0x04A0, 0x04A3}, /* disagnostics */
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{0x0000, 0x04E6, 0x04E7}, /* manufacturing use */
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{0x0000, 0x4000, 0x7FFF}, /* internal BIOS use */
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{0x0000, 0x9000, 0x9001}, /* internal BIOS use */
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{0x0000, 0xA000, 0xBFFF}, /* write only */
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{0x0000, 0xEFF0, 0xEFFF}, /* internal BIOS use */
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/* handled by kernel: dell-laptop */
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{0x0000, BRIGHTNESS_TOKEN, BRIGHTNESS_TOKEN},
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{0x0000, KBD_LED_OFF_TOKEN, KBD_LED_AUTO_TOKEN},
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{0x0000, KBD_LED_AC_TOKEN, KBD_LED_AC_TOKEN},
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{0x0000, KBD_LED_AUTO_25_TOKEN, KBD_LED_AUTO_75_TOKEN},
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{0x0000, KBD_LED_AUTO_100_TOKEN, KBD_LED_AUTO_100_TOKEN},
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{0x0000, GLOBAL_MIC_MUTE_ENABLE, GLOBAL_MIC_MUTE_DISABLE},
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};
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static LIST_HEAD(smbios_device_list);
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int dell_smbios_error(int value)
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{
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switch (value) {
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case 0: /* Completed successfully */
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return 0;
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case -1: /* Completed with error */
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return -EIO;
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case -2: /* Function not supported */
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return -ENXIO;
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default: /* Unknown error */
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return -EINVAL;
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}
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}
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EXPORT_SYMBOL_GPL(dell_smbios_error);
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int dell_smbios_register_device(struct device *d, void *call_fn)
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{
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struct smbios_device *priv;
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priv = devm_kzalloc(d, sizeof(struct smbios_device), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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get_device(d);
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priv->device = d;
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priv->call_fn = call_fn;
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mutex_lock(&smbios_mutex);
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list_add_tail(&priv->list, &smbios_device_list);
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mutex_unlock(&smbios_mutex);
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dev_dbg(d, "Added device: %s\n", d->driver->name);
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return 0;
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}
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EXPORT_SYMBOL_GPL(dell_smbios_register_device);
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void dell_smbios_unregister_device(struct device *d)
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{
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struct smbios_device *priv;
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mutex_lock(&smbios_mutex);
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list_for_each_entry(priv, &smbios_device_list, list) {
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if (priv->device == d) {
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list_del(&priv->list);
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put_device(d);
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break;
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}
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}
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mutex_unlock(&smbios_mutex);
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dev_dbg(d, "Remove device: %s\n", d->driver->name);
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}
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EXPORT_SYMBOL_GPL(dell_smbios_unregister_device);
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int dell_smbios_call_filter(struct device *d,
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struct calling_interface_buffer *buffer)
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{
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u16 t = 0;
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int i;
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/* can't make calls over 30 */
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if (buffer->cmd_class > 30) {
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dev_dbg(d, "class too big: %u\n", buffer->cmd_class);
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return -EINVAL;
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}
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/* supported calls on the particular system */
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if (!(da_supported_commands & (1 << buffer->cmd_class))) {
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dev_dbg(d, "invalid command, supported commands: 0x%8x\n",
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da_supported_commands);
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return -EINVAL;
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}
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/* match against call blacklist */
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for (i = 0; i < ARRAY_SIZE(call_blacklist); i++) {
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if (buffer->cmd_class != call_blacklist[i].cmd_class)
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continue;
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if (buffer->cmd_select != call_blacklist[i].cmd_select &&
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call_blacklist[i].cmd_select != -1)
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continue;
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dev_dbg(d, "blacklisted command: %u/%u\n",
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buffer->cmd_class, buffer->cmd_select);
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return -EINVAL;
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}
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/* if a token call, find token ID */
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if ((buffer->cmd_class == CLASS_TOKEN_READ ||
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buffer->cmd_class == CLASS_TOKEN_WRITE) &&
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buffer->cmd_select < 3) {
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/* tokens enabled ? */
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if (!da_tokens) {
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dev_dbg(d, "no token support on this system\n");
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return -EINVAL;
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}
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/* find the matching token ID */
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for (i = 0; i < da_num_tokens; i++) {
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if (da_tokens[i].location != buffer->input[0])
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continue;
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t = da_tokens[i].tokenID;
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break;
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}
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/* token call; but token didn't exist */
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if (!t) {
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dev_dbg(d, "token at location %04x doesn't exist\n",
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buffer->input[0]);
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return -EINVAL;
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}
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/* match against token blacklist */
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for (i = 0; i < ARRAY_SIZE(token_blacklist); i++) {
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if (!token_blacklist[i].min || !token_blacklist[i].max)
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continue;
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if (t >= token_blacklist[i].min &&
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t <= token_blacklist[i].max)
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return -EINVAL;
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}
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/* match against token whitelist */
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for (i = 0; i < ARRAY_SIZE(token_whitelist); i++) {
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if (!token_whitelist[i].min || !token_whitelist[i].max)
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continue;
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if (t < token_whitelist[i].min ||
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t > token_whitelist[i].max)
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continue;
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if (!token_whitelist[i].need_capability ||
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capable(token_whitelist[i].need_capability)) {
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dev_dbg(d, "whitelisted token: %x\n", t);
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return 0;
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}
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}
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}
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/* match against call whitelist */
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for (i = 0; i < ARRAY_SIZE(call_whitelist); i++) {
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if (buffer->cmd_class != call_whitelist[i].cmd_class)
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continue;
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if (buffer->cmd_select != call_whitelist[i].cmd_select)
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continue;
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if (!call_whitelist[i].need_capability ||
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capable(call_whitelist[i].need_capability)) {
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dev_dbg(d, "whitelisted capable command: %u/%u\n",
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buffer->cmd_class, buffer->cmd_select);
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return 0;
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}
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dev_dbg(d, "missing capability %d for %u/%u\n",
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call_whitelist[i].need_capability,
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buffer->cmd_class, buffer->cmd_select);
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}
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/* not in a whitelist, only allow processes with capabilities */
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if (capable(CAP_SYS_RAWIO)) {
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dev_dbg(d, "Allowing %u/%u due to CAP_SYS_RAWIO\n",
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buffer->cmd_class, buffer->cmd_select);
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return 0;
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}
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return -EACCES;
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}
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EXPORT_SYMBOL_GPL(dell_smbios_call_filter);
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int dell_smbios_call(struct calling_interface_buffer *buffer)
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{
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int (*call_fn)(struct calling_interface_buffer *) = NULL;
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struct device *selected_dev = NULL;
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struct smbios_device *priv;
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int ret;
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mutex_lock(&smbios_mutex);
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list_for_each_entry(priv, &smbios_device_list, list) {
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if (!selected_dev || priv->device->id >= selected_dev->id) {
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dev_dbg(priv->device, "Trying device ID: %d\n",
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priv->device->id);
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call_fn = priv->call_fn;
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selected_dev = priv->device;
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}
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}
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if (!selected_dev) {
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ret = -ENODEV;
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pr_err("No dell-smbios drivers are loaded\n");
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goto out_smbios_call;
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}
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ret = call_fn(buffer);
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out_smbios_call:
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mutex_unlock(&smbios_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dell_smbios_call);
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struct calling_interface_token *dell_smbios_find_token(int tokenid)
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{
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int i;
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if (!da_tokens)
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return NULL;
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for (i = 0; i < da_num_tokens; i++) {
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if (da_tokens[i].tokenID == tokenid)
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return &da_tokens[i];
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(dell_smbios_find_token);
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static BLOCKING_NOTIFIER_HEAD(dell_laptop_chain_head);
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int dell_laptop_register_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&dell_laptop_chain_head, nb);
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}
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EXPORT_SYMBOL_GPL(dell_laptop_register_notifier);
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int dell_laptop_unregister_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&dell_laptop_chain_head, nb);
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}
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EXPORT_SYMBOL_GPL(dell_laptop_unregister_notifier);
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void dell_laptop_call_notifier(unsigned long action, void *data)
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{
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blocking_notifier_call_chain(&dell_laptop_chain_head, action, data);
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}
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EXPORT_SYMBOL_GPL(dell_laptop_call_notifier);
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static void __init parse_da_table(const struct dmi_header *dm)
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{
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/* Final token is a terminator, so we don't want to copy it */
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int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1;
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struct calling_interface_token *new_da_tokens;
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struct calling_interface_structure *table =
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container_of(dm, struct calling_interface_structure, header);
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/*
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* 4 bytes of table header, plus 7 bytes of Dell header
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* plus at least 6 bytes of entry
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*/
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if (dm->length < 17)
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return;
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da_supported_commands = table->supportedCmds;
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new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) *
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sizeof(struct calling_interface_token),
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GFP_KERNEL);
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if (!new_da_tokens)
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return;
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da_tokens = new_da_tokens;
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memcpy(da_tokens+da_num_tokens, table->tokens,
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sizeof(struct calling_interface_token) * tokens);
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da_num_tokens += tokens;
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}
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static void zero_duplicates(struct device *dev)
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{
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int i, j;
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for (i = 0; i < da_num_tokens; i++) {
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if (da_tokens[i].tokenID == 0)
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continue;
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for (j = i+1; j < da_num_tokens; j++) {
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if (da_tokens[j].tokenID == 0)
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continue;
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if (da_tokens[i].tokenID == da_tokens[j].tokenID) {
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dev_dbg(dev, "Zeroing dup token ID %x(%x/%x)\n",
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da_tokens[j].tokenID,
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da_tokens[j].location,
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da_tokens[j].value);
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da_tokens[j].tokenID = 0;
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}
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}
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}
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}
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static void __init find_tokens(const struct dmi_header *dm, void *dummy)
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{
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switch (dm->type) {
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case 0xd4: /* Indexed IO */
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case 0xd5: /* Protected Area Type 1 */
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case 0xd6: /* Protected Area Type 2 */
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break;
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case 0xda: /* Calling interface */
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parse_da_table(dm);
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break;
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}
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}
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static int match_attribute(struct device *dev,
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struct device_attribute *attr)
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{
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int i;
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for (i = 0; i < da_num_tokens * 2; i++) {
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if (!token_attrs[i])
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continue;
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if (strcmp(token_attrs[i]->name, attr->attr.name) == 0)
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return i/2;
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}
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dev_dbg(dev, "couldn't match: %s\n", attr->attr.name);
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return -EINVAL;
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}
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static ssize_t location_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int i;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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i = match_attribute(dev, attr);
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if (i > 0)
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return scnprintf(buf, PAGE_SIZE, "%08x", da_tokens[i].location);
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return 0;
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}
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static ssize_t value_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int i;
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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i = match_attribute(dev, attr);
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if (i > 0)
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return scnprintf(buf, PAGE_SIZE, "%08x", da_tokens[i].value);
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return 0;
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}
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static struct attribute_group smbios_attribute_group = {
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.name = "tokens"
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};
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static struct platform_driver platform_driver = {
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.driver = {
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.name = "dell-smbios",
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},
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};
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static int build_tokens_sysfs(struct platform_device *dev)
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{
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char *location_name;
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char *value_name;
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size_t size;
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int ret;
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int i, j;
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/* (number of tokens + 1 for null terminated */
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size = sizeof(struct device_attribute) * (da_num_tokens + 1);
|
|
token_location_attrs = kzalloc(size, GFP_KERNEL);
|
|
if (!token_location_attrs)
|
|
return -ENOMEM;
|
|
token_value_attrs = kzalloc(size, GFP_KERNEL);
|
|
if (!token_value_attrs)
|
|
goto out_allocate_value;
|
|
|
|
/* need to store both location and value + terminator*/
|
|
size = sizeof(struct attribute *) * ((2 * da_num_tokens) + 1);
|
|
token_attrs = kzalloc(size, GFP_KERNEL);
|
|
if (!token_attrs)
|
|
goto out_allocate_attrs;
|
|
|
|
for (i = 0, j = 0; i < da_num_tokens; i++) {
|
|
/* skip empty */
|
|
if (da_tokens[i].tokenID == 0)
|
|
continue;
|
|
/* add location */
|
|
location_name = kasprintf(GFP_KERNEL, "%04x_location",
|
|
da_tokens[i].tokenID);
|
|
if (location_name == NULL)
|
|
goto out_unwind_strings;
|
|
sysfs_attr_init(&token_location_attrs[i].attr);
|
|
token_location_attrs[i].attr.name = location_name;
|
|
token_location_attrs[i].attr.mode = 0444;
|
|
token_location_attrs[i].show = location_show;
|
|
token_attrs[j++] = &token_location_attrs[i].attr;
|
|
|
|
/* add value */
|
|
value_name = kasprintf(GFP_KERNEL, "%04x_value",
|
|
da_tokens[i].tokenID);
|
|
if (value_name == NULL)
|
|
goto loop_fail_create_value;
|
|
sysfs_attr_init(&token_value_attrs[i].attr);
|
|
token_value_attrs[i].attr.name = value_name;
|
|
token_value_attrs[i].attr.mode = 0444;
|
|
token_value_attrs[i].show = value_show;
|
|
token_attrs[j++] = &token_value_attrs[i].attr;
|
|
continue;
|
|
|
|
loop_fail_create_value:
|
|
kfree(location_name);
|
|
goto out_unwind_strings;
|
|
}
|
|
smbios_attribute_group.attrs = token_attrs;
|
|
|
|
ret = sysfs_create_group(&dev->dev.kobj, &smbios_attribute_group);
|
|
if (ret)
|
|
goto out_unwind_strings;
|
|
return 0;
|
|
|
|
out_unwind_strings:
|
|
while (i--) {
|
|
kfree(token_location_attrs[i].attr.name);
|
|
kfree(token_value_attrs[i].attr.name);
|
|
}
|
|
kfree(token_attrs);
|
|
out_allocate_attrs:
|
|
kfree(token_value_attrs);
|
|
out_allocate_value:
|
|
kfree(token_location_attrs);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void free_group(struct platform_device *pdev)
|
|
{
|
|
int i;
|
|
|
|
sysfs_remove_group(&pdev->dev.kobj,
|
|
&smbios_attribute_group);
|
|
for (i = 0; i < da_num_tokens; i++) {
|
|
kfree(token_location_attrs[i].attr.name);
|
|
kfree(token_value_attrs[i].attr.name);
|
|
}
|
|
kfree(token_attrs);
|
|
kfree(token_value_attrs);
|
|
kfree(token_location_attrs);
|
|
}
|
|
|
|
static int __init dell_smbios_init(void)
|
|
{
|
|
int ret, wmi, smm;
|
|
|
|
if (!dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL) &&
|
|
!dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "www.dell.com", NULL)) {
|
|
pr_err("Unable to run on non-Dell system\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
dmi_walk(find_tokens, NULL);
|
|
|
|
ret = platform_driver_register(&platform_driver);
|
|
if (ret)
|
|
goto fail_platform_driver;
|
|
|
|
platform_device = platform_device_alloc("dell-smbios", 0);
|
|
if (!platform_device) {
|
|
ret = -ENOMEM;
|
|
goto fail_platform_device_alloc;
|
|
}
|
|
ret = platform_device_add(platform_device);
|
|
if (ret)
|
|
goto fail_platform_device_add;
|
|
|
|
/* register backends */
|
|
wmi = init_dell_smbios_wmi();
|
|
if (wmi)
|
|
pr_debug("Failed to initialize WMI backend: %d\n", wmi);
|
|
smm = init_dell_smbios_smm();
|
|
if (smm)
|
|
pr_debug("Failed to initialize SMM backend: %d\n", smm);
|
|
if (wmi && smm) {
|
|
pr_err("No SMBIOS backends available (wmi: %d, smm: %d)\n",
|
|
wmi, smm);
|
|
goto fail_create_group;
|
|
}
|
|
|
|
if (da_tokens) {
|
|
/* duplicate tokens will cause problems building sysfs files */
|
|
zero_duplicates(&platform_device->dev);
|
|
|
|
ret = build_tokens_sysfs(platform_device);
|
|
if (ret)
|
|
goto fail_sysfs;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_sysfs:
|
|
free_group(platform_device);
|
|
|
|
fail_create_group:
|
|
platform_device_del(platform_device);
|
|
|
|
fail_platform_device_add:
|
|
platform_device_put(platform_device);
|
|
|
|
fail_platform_device_alloc:
|
|
platform_driver_unregister(&platform_driver);
|
|
|
|
fail_platform_driver:
|
|
kfree(da_tokens);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit dell_smbios_exit(void)
|
|
{
|
|
exit_dell_smbios_wmi();
|
|
exit_dell_smbios_smm();
|
|
mutex_lock(&smbios_mutex);
|
|
if (platform_device) {
|
|
if (da_tokens)
|
|
free_group(platform_device);
|
|
platform_device_unregister(platform_device);
|
|
platform_driver_unregister(&platform_driver);
|
|
}
|
|
kfree(da_tokens);
|
|
mutex_unlock(&smbios_mutex);
|
|
}
|
|
|
|
module_init(dell_smbios_init);
|
|
module_exit(dell_smbios_exit);
|
|
|
|
MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
|
|
MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>");
|
|
MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>");
|
|
MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>");
|
|
MODULE_DESCRIPTION("Common functions for kernel modules using Dell SMBIOS");
|
|
MODULE_LICENSE("GPL");
|