diff options
Diffstat (limited to 'drivers/acpi/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 173 |
1 files changed, 130 insertions, 43 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index e3a673a00845..e53fb516f9d4 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -77,11 +77,55 @@ static struct workqueue_struct *kacpi_notify_wq; #define OSI_STRING_LENGTH_MAX 64 /* arbitrary */ static char osi_additional_string[OSI_STRING_LENGTH_MAX]; -static int osi_linux; /* disable _OSI(Linux) by default */ +/* + * "Ode to _OSI(Linux)" + * + * osi_linux -- Control response to BIOS _OSI(Linux) query. + * + * As Linux evolves, the features that it supports change. + * So an OSI string such as "Linux" is not specific enough + * to be useful across multiple versions of Linux. It + * doesn't identify any particular feature, interface, + * or even any particular version of Linux... + * + * Unfortunately, Linux-2.6.22 and earlier responded "yes" + * to a BIOS _OSI(Linux) query. When + * a reference mobile BIOS started using it, its use + * started to spread to many vendor platforms. + * As it is not supportable, we need to halt that spread. + * + * Today, most BIOS references to _OSI(Linux) are noise -- + * they have no functional effect and are just dead code + * carried over from the reference BIOS. + * + * The next most common case is that _OSI(Linux) harms Linux, + * usually by causing the BIOS to follow paths that are + * not tested during Windows validation. + * + * Finally, there is a short list of platforms + * where OSI(Linux) benefits Linux. + * + * In Linux-2.6.23, OSI(Linux) is first disabled by default. + * DMI is used to disable the dmesg warning about OSI(Linux) + * on platforms where it is known to have no effect. + * But a dmesg warning remains for systems where + * we do not know if OSI(Linux) is good or bad for the system. + * DMI is also used to enable OSI(Linux) for the machines + * that are known to need it. + * + * BIOS writers should NOT query _OSI(Linux) on future systems. + * It will be ignored by default, and to get Linux to + * not ignore it will require a kernel source update to + * add a DMI entry, or a boot-time "acpi_osi=Linux" invocation. + */ +#define OSI_LINUX_ENABLE 0 -#ifdef CONFIG_DMI -static struct __initdata dmi_system_id acpi_osl_dmi_table[]; -#endif +struct osi_linux { + unsigned int enable:1; + unsigned int dmi:1; + unsigned int cmdline:1; + unsigned int known:1; +} osi_linux = { OSI_LINUX_ENABLE, 0, 0, 0}; static void __init acpi_request_region (struct acpi_generic_address *addr, unsigned int length, char *desc) @@ -133,7 +177,6 @@ device_initcall(acpi_reserve_resources); acpi_status __init acpi_os_initialize(void) { - dmi_check_system(acpi_osl_dmi_table); return AE_OK; } @@ -964,13 +1007,37 @@ static int __init acpi_os_name_setup(char *str) __setup("acpi_os_name=", acpi_os_name_setup); -static void enable_osi_linux(int enable) { +static void __init set_osi_linux(unsigned int enable) +{ + if (osi_linux.enable != enable) { + osi_linux.enable = enable; + printk(KERN_NOTICE PREFIX "%sed _OSI(Linux)\n", + enable ? "Add": "Delet"); + } + return; +} - if (osi_linux != enable) - printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n", - enable ? "En": "Dis"); +static void __init acpi_cmdline_osi_linux(unsigned int enable) +{ + osi_linux.cmdline = 1; /* cmdline set the default */ + set_osi_linux(enable); + + return; +} + +void __init acpi_dmi_osi_linux(int enable, const struct dmi_system_id *d) +{ + osi_linux.dmi = 1; /* DMI knows that this box asks OSI(Linux) */ + + printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident); + + if (enable == -1) + return; + + osi_linux.known = 1; /* DMI knows which OSI(Linux) default needed */ + + set_osi_linux(enable); - osi_linux = enable; return; } @@ -987,12 +1054,12 @@ static int __init acpi_osi_setup(char *str) printk(KERN_INFO PREFIX "_OSI method disabled\n"); acpi_gbl_create_osi_method = FALSE; } else if (!strcmp("!Linux", str)) { - enable_osi_linux(0); + acpi_cmdline_osi_linux(0); /* !enable */ } else if (*str == '!') { if (acpi_osi_invalidate(++str) == AE_OK) printk(KERN_INFO PREFIX "Deleted _OSI(%s)\n", str); } else if (!strcmp("Linux", str)) { - enable_osi_linux(1); + acpi_cmdline_osi_linux(1); /* enable */ } else if (*osi_additional_string == '\0') { strncpy(osi_additional_string, str, OSI_STRING_LENGTH_MAX); printk(KERN_INFO PREFIX "Added _OSI(%s)\n", str); @@ -1141,6 +1208,34 @@ acpi_status acpi_os_release_object(acpi_cache_t * cache, void *object) return (AE_OK); } +/** + * acpi_dmi_dump - dump DMI slots needed for blacklist entry + * + * Returns 0 on success + */ +int acpi_dmi_dump(void) +{ + + if (!dmi_available) + return -1; + + printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n", + dmi_get_slot(DMI_SYS_VENDOR)); + printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n", + dmi_get_slot(DMI_PRODUCT_NAME)); + printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n", + dmi_get_slot(DMI_PRODUCT_VERSION)); + printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n", + dmi_get_slot(DMI_BOARD_NAME)); + printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n", + dmi_get_slot(DMI_BIOS_VENDOR)); + printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n", + dmi_get_slot(DMI_BIOS_DATE)); + + return 0; +} + + /****************************************************************************** * * FUNCTION: acpi_os_validate_interface @@ -1160,13 +1255,29 @@ acpi_os_validate_interface (char *interface) if (!strncmp(osi_additional_string, interface, OSI_STRING_LENGTH_MAX)) return AE_OK; if (!strcmp("Linux", interface)) { - printk(KERN_WARNING PREFIX - "System BIOS is requesting _OSI(Linux)\n"); - printk(KERN_WARNING PREFIX - "If \"acpi_osi=Linux\" works better,\n" - "Please send dmidecode " - "to linux-acpi@vger.kernel.org\n"); - if(osi_linux) + + printk(KERN_NOTICE PREFIX + "BIOS _OSI(Linux) query %s%s\n", + osi_linux.enable ? "honored" : "ignored", + osi_linux.cmdline ? " via cmdline" : + osi_linux.dmi ? " via DMI" : ""); + + if (!osi_linux.dmi) { + if (acpi_dmi_dump()) + printk(KERN_NOTICE PREFIX + "[please extract dmidecode output]\n"); + printk(KERN_NOTICE PREFIX + "Please send DMI info above to " + "linux-acpi@vger.kernel.org\n"); + } + if (!osi_linux.known && !osi_linux.cmdline) { + printk(KERN_NOTICE PREFIX + "If \"acpi_osi=%sLinux\" works better, " + "please notify linux-acpi@vger.kernel.org\n", + osi_linux.enable ? "!" : ""); + } + + if (osi_linux.enable) return AE_OK; } return AE_SUPPORT; @@ -1198,28 +1309,4 @@ acpi_os_validate_address ( return AE_OK; } -#ifdef CONFIG_DMI -static int dmi_osi_linux(const struct dmi_system_id *d) -{ - printk(KERN_NOTICE "%s detected: enabling _OSI(Linux)\n", d->ident); - enable_osi_linux(1); - return 0; -} - -static struct dmi_system_id acpi_osl_dmi_table[] __initdata = { - /* - * Boxes that need _OSI(Linux) - */ - { - .callback = dmi_osi_linux, - .ident = "Intel Napa CRB", - .matches = { - DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"), - DMI_MATCH(DMI_BOARD_NAME, "MPAD-MSAE Customer Reference Boards"), - }, - }, - {} -}; -#endif /* CONFIG_DMI */ - #endif |