X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Facpi%2Fosl.c;h=07c18dbde698bbba86c17d7894a6ff5360abdcba;hb=7924e4f6519dd5b349ed146fe9fe35206730be67;hp=aabc6ca4a81c72463529c3e711b012f8b6e909a7;hpb=cfa76f024f7c9e65169425804e5b32e71f66d0ee;p=pandora-kernel.git diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index aabc6ca4a81c..07c18dbde698 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 +static 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; } @@ -207,8 +250,12 @@ acpi_physical_address __init acpi_os_get_root_pointer(void) "System description tables not found\n"); return 0; } - } else - return acpi_find_rsdp(); + } else { + acpi_physical_address pa = 0; + + acpi_find_root_pointer(&pa); + return pa; + } } void __iomem *acpi_os_map_memory(acpi_physical_address phys, acpi_size size) @@ -387,17 +434,14 @@ acpi_status acpi_os_read_port(acpi_io_address port, u32 * value, u32 width) if (!value) value = &dummy; - switch (width) { - case 8: + *value = 0; + if (width <= 8) { *(u8 *) value = inb(port); - break; - case 16: + } else if (width <= 16) { *(u16 *) value = inw(port); - break; - case 32: + } else if (width <= 32) { *(u32 *) value = inl(port); - break; - default: + } else { BUG(); } @@ -408,17 +452,13 @@ EXPORT_SYMBOL(acpi_os_read_port); acpi_status acpi_os_write_port(acpi_io_address port, u32 value, u32 width) { - switch (width) { - case 8: + if (width <= 8) { outb(value, port); - break; - case 16: + } else if (width <= 16) { outw(value, port); - break; - case 32: + } else if (width <= 32) { outl(value, port); - break; - default: + } else { BUG(); } @@ -625,25 +665,6 @@ static void acpi_os_execute_deferred(struct work_struct *work) dpc->function(dpc->context); kfree(dpc); - /* Yield cpu to notify thread */ - cond_resched(); - - return; -} - -static void acpi_os_execute_notify(struct work_struct *work) -{ - struct acpi_os_dpc *dpc = container_of(work, struct acpi_os_dpc, work); - - if (!dpc) { - printk(KERN_ERR PREFIX "Invalid (NULL) context\n"); - return; - } - - dpc->function(dpc->context); - - kfree(dpc); - return; } @@ -667,7 +688,7 @@ acpi_status acpi_os_execute(acpi_execute_type type, { acpi_status status = AE_OK; struct acpi_os_dpc *dpc; - + struct workqueue_struct *queue; ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "Scheduling function [%p(%p)] for deferred execution.\n", function, context)); @@ -691,20 +712,13 @@ acpi_status acpi_os_execute(acpi_execute_type type, dpc->function = function; dpc->context = context; - if (type == OSL_NOTIFY_HANDLER) { - INIT_WORK(&dpc->work, acpi_os_execute_notify); - if (!queue_work(kacpi_notify_wq, &dpc->work)) { - status = AE_ERROR; - kfree(dpc); - } - } else { - INIT_WORK(&dpc->work, acpi_os_execute_deferred); - if (!queue_work(kacpid_wq, &dpc->work)) { - ACPI_DEBUG_PRINT((ACPI_DB_ERROR, - "Call to queue_work() failed.\n")); - status = AE_ERROR; - kfree(dpc); - } + INIT_WORK(&dpc->work, acpi_os_execute_deferred); + queue = (type == OSL_NOTIFY_HANDLER) ? kacpi_notify_wq : kacpid_wq; + if (!queue_work(queue, &dpc->work)) { + ACPI_DEBUG_PRINT((ACPI_DB_ERROR, + "Call to queue_work() failed.\n")); + status = AE_ERROR; + kfree(dpc); } return_ACPI_STATUS(status); } @@ -971,13 +985,37 @@ 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; +} + +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 */ - if (osi_linux != enable) - printk(KERN_INFO PREFIX "%sabled _OSI(Linux)\n", - enable ? "En": "Dis"); + set_osi_linux(enable); - osi_linux = enable; return; } @@ -994,12 +1032,12 @@ 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); @@ -1148,6 +1186,34 @@ 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 + */ +static int acpi_dmi_dump(void) +{ + + if (!dmi_available) + return -1; + + printk(KERN_NOTICE PREFIX "DMI System Vendor: %s\n", + dmi_get_system_info(DMI_SYS_VENDOR)); + printk(KERN_NOTICE PREFIX "DMI Product Name: %s\n", + dmi_get_system_info(DMI_PRODUCT_NAME)); + printk(KERN_NOTICE PREFIX "DMI Product Version: %s\n", + dmi_get_system_info(DMI_PRODUCT_VERSION)); + printk(KERN_NOTICE PREFIX "DMI Board Name: %s\n", + dmi_get_system_info(DMI_BOARD_NAME)); + printk(KERN_NOTICE PREFIX "DMI BIOS Vendor: %s\n", + dmi_get_system_info(DMI_BIOS_VENDOR)); + printk(KERN_NOTICE PREFIX "DMI BIOS Date: %s\n", + dmi_get_system_info(DMI_BIOS_DATE)); + + return 0; +} + + /****************************************************************************** * * FUNCTION: acpi_os_validate_interface @@ -1167,13 +1233,29 @@ 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; @@ -1205,28 +1287,4 @@ 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