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linux-next/drivers/acpi/osi.c
Alex Hung 28586a51ee ACPI / OSI: Add OEM _OSI string to enable dGPU direct output 
For HP Inc. mobile workstation with hybrid graphics support, dGPU can
directly output to external monitors; however, Nvidia and AMD's Linux
drivers aren't able to support this feature.

The OEM _OSI string "Linux-HPI-Hybrid-Graphics" is used by BIOS to
implement dGPU direct output to external monitors.

The form of the OEM _OSI strings is defined by each OEMs and is
discussed in Documentation/acpi/osi.txt.

Signed-off-by: Alex Hung <alex.hung@canonical.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-12-18 11:06:05 +01:00

527 lines
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/*
* osi.c - _OSI implementation
*
* Copyright (C) 2016 Intel Corporation
* Author: Lv Zheng <lv.zheng@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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; either version 2 of the License, or (at
* your option) any later version.
*
* 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. See the GNU
* General Public License for more details.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
/* Uncomment next line to get verbose printout */
/* #define DEBUG */
#define pr_fmt(fmt) "ACPI: " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/platform_data/x86/apple.h>
#include "internal.h"
#define OSI_STRING_LENGTH_MAX 64
#define OSI_STRING_ENTRIES_MAX 16
struct acpi_osi_entry {
char string[OSI_STRING_LENGTH_MAX];
bool enable;
};
static struct acpi_osi_config {
u8 default_disabling;
unsigned int linux_enable:1;
unsigned int linux_dmi:1;
unsigned int linux_cmdline:1;
unsigned int darwin_enable:1;
unsigned int darwin_dmi:1;
unsigned int darwin_cmdline:1;
} osi_config;
static struct acpi_osi_config osi_config;
static struct acpi_osi_entry
osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = {
{"Module Device", true},
{"Processor Device", true},
{"3.0 _SCP Extensions", true},
{"Processor Aggregator Device", true},
/*
* Linux-Dell-Video is used by BIOS to disable RTD3 for NVidia graphics
* cards as RTD3 is not supported by drivers now. Systems with NVidia
* cards will hang without RTD3 disabled.
*
* Once NVidia drivers officially support RTD3, this _OSI strings can
* be removed if both new and old graphics cards are supported.
*/
{"Linux-Dell-Video", true},
/*
* Linux-Lenovo-NV-HDMI-Audio is used by BIOS to power on NVidia's HDMI
* audio device which is turned off for power-saving in Windows OS.
* This power management feature observed on some Lenovo Thinkpad
* systems which will not be able to output audio via HDMI without
* a BIOS workaround.
*/
{"Linux-Lenovo-NV-HDMI-Audio", true},
/*
* Linux-HPI-Hybrid-Graphics is used by BIOS to enable dGPU to
* output video directly to external monitors on HP Inc. mobile
* workstations as Nvidia and AMD VGA drivers provide limited
* hybrid graphics supports.
*/
{"Linux-HPI-Hybrid-Graphics", true},
};
static u32 acpi_osi_handler(acpi_string interface, u32 supported)
{
if (!strcmp("Linux", interface)) {
pr_notice_once(FW_BUG
"BIOS _OSI(Linux) query %s%s\n",
osi_config.linux_enable ? "honored" : "ignored",
osi_config.linux_cmdline ? " via cmdline" :
osi_config.linux_dmi ? " via DMI" : "");
}
if (!strcmp("Darwin", interface)) {
pr_notice_once(
"BIOS _OSI(Darwin) query %s%s\n",
osi_config.darwin_enable ? "honored" : "ignored",
osi_config.darwin_cmdline ? " via cmdline" :
osi_config.darwin_dmi ? " via DMI" : "");
}
return supported;
}
void __init acpi_osi_setup(char *str)
{
struct acpi_osi_entry *osi;
bool enable = true;
int i;
if (!acpi_gbl_create_osi_method)
return;
if (str == NULL || *str == '\0') {
pr_info("_OSI method disabled\n");
acpi_gbl_create_osi_method = FALSE;
return;
}
if (*str == '!') {
str++;
if (*str == '\0') {
/* Do not override acpi_osi=!* */
if (!osi_config.default_disabling)
osi_config.default_disabling =
ACPI_DISABLE_ALL_VENDOR_STRINGS;
return;
} else if (*str == '*') {
osi_config.default_disabling = ACPI_DISABLE_ALL_STRINGS;
for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
osi = &osi_setup_entries[i];
osi->enable = false;
}
return;
} else if (*str == '!') {
osi_config.default_disabling = 0;
return;
}
enable = false;
}
for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
osi = &osi_setup_entries[i];
if (!strcmp(osi->string, str)) {
osi->enable = enable;
break;
} else if (osi->string[0] == '\0') {
osi->enable = enable;
strncpy(osi->string, str, OSI_STRING_LENGTH_MAX);
break;
}
}
}
static void __init __acpi_osi_setup_darwin(bool enable)
{
osi_config.darwin_enable = !!enable;
if (enable) {
acpi_osi_setup("!");
acpi_osi_setup("Darwin");
} else {
acpi_osi_setup("!!");
acpi_osi_setup("!Darwin");
}
}
static void __init acpi_osi_setup_darwin(bool enable)
{
/* Override acpi_osi_dmi_blacklisted() */
osi_config.darwin_dmi = 0;
osi_config.darwin_cmdline = 1;
__acpi_osi_setup_darwin(enable);
}
/*
* The story of _OSI(Linux)
*
* From pre-history through Linux-2.6.22, Linux responded TRUE upon a BIOS
* OSI(Linux) query.
*
* Unfortunately, reference BIOS writers got wind of this and put
* OSI(Linux) in their example code, quickly exposing this string as
* ill-conceived and opening the door to an un-bounded number of BIOS
* incompatibilities.
*
* For example, OSI(Linux) was used on resume to re-POST a video card on
* one system, because Linux at that time could not do a speedy restore in
* its native driver. But then upon gaining quick native restore
* capability, Linux has no way to tell the BIOS to skip the time-consuming
* POST -- putting Linux at a permanent performance disadvantage. On
* another system, the BIOS writer used OSI(Linux) to infer native OS
* support for IPMI! On other systems, OSI(Linux) simply got in the way of
* Linux claiming to be compatible with other operating systems, exposing
* BIOS issues such as skipped device initialization.
*
* So "Linux" turned out to be a really poor chose of OSI string, and from
* Linux-2.6.23 onward we respond FALSE.
*
* BIOS writers should NOT query _OSI(Linux) on future systems. Linux will
* complain on the console when it sees it, and return FALSE. To get Linux
* to return TRUE for your system will require a kernel source update to
* add a DMI entry, or boot with "acpi_osi=Linux"
*/
static void __init __acpi_osi_setup_linux(bool enable)
{
osi_config.linux_enable = !!enable;
if (enable)
acpi_osi_setup("Linux");
else
acpi_osi_setup("!Linux");
}
static void __init acpi_osi_setup_linux(bool enable)
{
/* Override acpi_osi_dmi_blacklisted() */
osi_config.linux_dmi = 0;
osi_config.linux_cmdline = 1;
__acpi_osi_setup_linux(enable);
}
/*
* Modify the list of "OS Interfaces" reported to BIOS via _OSI
*
* empty string disables _OSI
* string starting with '!' disables that string
* otherwise string is added to list, augmenting built-in strings
*/
static void __init acpi_osi_setup_late(void)
{
struct acpi_osi_entry *osi;
char *str;
int i;
acpi_status status;
if (osi_config.default_disabling) {
status = acpi_update_interfaces(osi_config.default_disabling);
if (ACPI_SUCCESS(status))
pr_info("Disabled all _OSI OS vendors%s\n",
osi_config.default_disabling ==
ACPI_DISABLE_ALL_STRINGS ?
" and feature groups" : "");
}
for (i = 0; i < OSI_STRING_ENTRIES_MAX; i++) {
osi = &osi_setup_entries[i];
str = osi->string;
if (*str == '\0')
break;
if (osi->enable) {
status = acpi_install_interface(str);
if (ACPI_SUCCESS(status))
pr_info("Added _OSI(%s)\n", str);
} else {
status = acpi_remove_interface(str);
if (ACPI_SUCCESS(status))
pr_info("Deleted _OSI(%s)\n", str);
}
}
}
static int __init osi_setup(char *str)
{
if (str && !strcmp("Linux", str))
acpi_osi_setup_linux(true);
else if (str && !strcmp("!Linux", str))
acpi_osi_setup_linux(false);
else if (str && !strcmp("Darwin", str))
acpi_osi_setup_darwin(true);
else if (str && !strcmp("!Darwin", str))
acpi_osi_setup_darwin(false);
else
acpi_osi_setup(str);
return 1;
}
__setup("acpi_osi=", osi_setup);
bool acpi_osi_is_win8(void)
{
return acpi_gbl_osi_data >= ACPI_OSI_WIN_8;
}
EXPORT_SYMBOL(acpi_osi_is_win8);
static void __init acpi_osi_dmi_darwin(void)
{
pr_notice("DMI detected to setup _OSI(\"Darwin\"): Apple hardware\n");
osi_config.darwin_dmi = 1;
__acpi_osi_setup_darwin(true);
}
static void __init acpi_osi_dmi_linux(bool enable,
const struct dmi_system_id *d)
{
pr_notice("DMI detected to setup _OSI(\"Linux\"): %s\n", d->ident);
osi_config.linux_dmi = 1;
__acpi_osi_setup_linux(enable);
}
static int __init dmi_enable_osi_linux(const struct dmi_system_id *d)
{
acpi_osi_dmi_linux(true, d);
return 0;
}
static int __init dmi_disable_osi_vista(const struct dmi_system_id *d)
{
pr_notice("DMI detected: %s\n", d->ident);
acpi_osi_setup("!Windows 2006");
acpi_osi_setup("!Windows 2006 SP1");
acpi_osi_setup("!Windows 2006 SP2");
return 0;
}
static int __init dmi_disable_osi_win7(const struct dmi_system_id *d)
{
pr_notice("DMI detected: %s\n", d->ident);
acpi_osi_setup("!Windows 2009");
return 0;
}
static int __init dmi_disable_osi_win8(const struct dmi_system_id *d)
{
pr_notice("DMI detected: %s\n", d->ident);
acpi_osi_setup("!Windows 2012");
return 0;
}
/*
* Linux default _OSI response behavior is determined by this DMI table.
*
* Note that _OSI("Linux")/_OSI("Darwin") determined here can be overridden
* by acpi_osi=!Linux/acpi_osi=!Darwin command line options.
*/
static const struct dmi_system_id acpi_osi_dmi_table[] __initconst = {
{
.callback = dmi_disable_osi_vista,
.ident = "Fujitsu Siemens",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile V5505"),
},
},
{
/*
* There have a NVIF method in MSI GX723 DSDT need call by Nvidia
* driver (e.g. nouveau) when user press brightness hotkey.
* Currently, nouveau driver didn't do the job and it causes there
* have a infinite while loop in DSDT when user press hotkey.
* We add MSI GX723's dmi information to this table for workaround
* this issue.
* Will remove MSI GX723 from the table after nouveau grows support.
*/
.callback = dmi_disable_osi_vista,
.ident = "MSI GX723",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star International"),
DMI_MATCH(DMI_PRODUCT_NAME, "GX723"),
},
},
{
.callback = dmi_disable_osi_vista,
.ident = "Sony VGN-NS10J_S",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS10J_S"),
},
},
{
.callback = dmi_disable_osi_vista,
.ident = "Sony VGN-SR290J",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR290J"),
},
},
{
.callback = dmi_disable_osi_vista,
.ident = "VGN-NS50B_L",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NS50B_L"),
},
},
{
.callback = dmi_disable_osi_vista,
.ident = "VGN-SR19XN",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR19XN"),
},
},
{
.callback = dmi_disable_osi_vista,
.ident = "Toshiba Satellite L355",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_VERSION, "Satellite L355"),
},
},
{
.callback = dmi_disable_osi_win7,
.ident = "ASUS K50IJ",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "K50IJ"),
},
},
{
.callback = dmi_disable_osi_vista,
.ident = "Toshiba P305D",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "Satellite P305D"),
},
},
{
.callback = dmi_disable_osi_vista,
.ident = "Toshiba NB100",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "NB100"),
},
},
/*
* The wireless hotkey does not work on those machines when
* returning true for _OSI("Windows 2012")
*/
{
.callback = dmi_disable_osi_win8,
.ident = "Dell Inspiron 7737",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7737"),
},
},
{
.callback = dmi_disable_osi_win8,
.ident = "Dell Inspiron 7537",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 7537"),
},
},
{
.callback = dmi_disable_osi_win8,
.ident = "Dell Inspiron 5437",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 5437"),
},
},
{
.callback = dmi_disable_osi_win8,
.ident = "Dell Inspiron 3437",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron 3437"),
},
},
{
.callback = dmi_disable_osi_win8,
.ident = "Dell Vostro 3446",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3446"),
},
},
{
.callback = dmi_disable_osi_win8,
.ident = "Dell Vostro 3546",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3546"),
},
},
/*
* BIOS invocation of _OSI(Linux) is almost always a BIOS bug.
* Linux ignores it, except for the machines enumerated below.
*/
/*
* Without this this EEEpc exports a non working WMI interface, with
* this it exports a working "good old" eeepc_laptop interface, fixing
* both brightness control, and rfkill not working.
*/
{
.callback = dmi_enable_osi_linux,
.ident = "Asus EEE PC 1015PX",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer INC."),
DMI_MATCH(DMI_PRODUCT_NAME, "1015PX"),
},
},
{}
};
static __init void acpi_osi_dmi_blacklisted(void)
{
dmi_check_system(acpi_osi_dmi_table);
/* Enable _OSI("Darwin") for Apple platforms. */
if (x86_apple_machine)
acpi_osi_dmi_darwin();
}
int __init early_acpi_osi_init(void)
{
acpi_osi_dmi_blacklisted();
return 0;
}
int __init acpi_osi_init(void)
{
acpi_install_interface_handler(acpi_osi_handler);
acpi_osi_setup_late();
return 0;
}
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