diff options
Diffstat (limited to 'drivers/acpi/bus.c')
| -rw-r--r-- | drivers/acpi/bus.c | 99 |
1 files changed, 84 insertions, 15 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 262ca31b86d9..85b7d07fe5c8 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -30,6 +30,9 @@ #include <linux/acpi.h> #include <linux/slab.h> #include <linux/regulator/machine.h> +#include <linux/workqueue.h> +#include <linux/reboot.h> +#include <linux/delay.h> #ifdef CONFIG_X86 #include <asm/mpspec.h> #endif @@ -174,22 +177,17 @@ void acpi_bus_detach_private_data(acpi_handle handle) EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); static void acpi_print_osc_error(acpi_handle handle, - struct acpi_osc_context *context, char *error) + struct acpi_osc_context *context, char *error) { - struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; int i; - if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) - printk(KERN_DEBUG "%s: %s\n", context->uuid_str, error); - else { - printk(KERN_DEBUG "%s (%s): %s\n", - (char *)buffer.pointer, context->uuid_str, error); - kfree(buffer.pointer); - } - printk(KERN_DEBUG "_OSC request data:"); + acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error); + + pr_debug("_OSC request data:"); for (i = 0; i < context->cap.length; i += sizeof(u32)) - printk(" %x", *((u32 *)(context->cap.pointer + i))); - printk("\n"); + pr_debug(" %x", *((u32 *)(context->cap.pointer + i))); + + pr_debug("\n"); } acpi_status acpi_str_to_uuid(char *str, u8 *uuid) @@ -302,6 +300,14 @@ out_kfree: EXPORT_SYMBOL(acpi_run_osc); bool osc_sb_apei_support_acked; + +/* + * ACPI 6.0 Section 8.4.4.2 Idle State Coordination + * OSPM supports platform coordinated low power idle(LPI) states + */ +bool osc_pc_lpi_support_confirmed; +EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); + static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; static void acpi_bus_osc_support(void) { @@ -322,6 +328,7 @@ static void acpi_bus_osc_support(void) capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; + capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT; if (!ghes_disable) capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; @@ -329,9 +336,12 @@ static void acpi_bus_osc_support(void) return; if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { u32 *capbuf_ret = context.ret.pointer; - if (context.ret.length > OSC_SUPPORT_DWORD) + if (context.ret.length > OSC_SUPPORT_DWORD) { osc_sb_apei_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; + osc_pc_lpi_support_confirmed = + capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT; + } kfree(context.ret.pointer); } /* do we need to check other returned cap? Sounds no */ @@ -475,6 +485,56 @@ static void acpi_device_remove_notify_handler(struct acpi_device *device) acpi_device_notify); } +/* Handle events targeting \_SB device (at present only graceful shutdown) */ + +#define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81 +#define ACPI_SB_INDICATE_INTERVAL 10000 + +static void sb_notify_work(struct work_struct *dummy) +{ + acpi_handle sb_handle; + + orderly_poweroff(true); + + /* + * After initiating graceful shutdown, the ACPI spec requires OSPM + * to evaluate _OST method once every 10seconds to indicate that + * the shutdown is in progress + */ + acpi_get_handle(NULL, "\\_SB", &sb_handle); + while (1) { + pr_info("Graceful shutdown in progress.\n"); + acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN, + ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL); + msleep(ACPI_SB_INDICATE_INTERVAL); + } +} + +static void acpi_sb_notify(acpi_handle handle, u32 event, void *data) +{ + static DECLARE_WORK(acpi_sb_work, sb_notify_work); + + if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) { + if (!work_busy(&acpi_sb_work)) + schedule_work(&acpi_sb_work); + } else + pr_warn("event %x is not supported by \\_SB device\n", event); +} + +static int __init acpi_setup_sb_notify_handler(void) +{ + acpi_handle sb_handle; + + if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle))) + return -ENXIO; + + if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY, + acpi_sb_notify, NULL))) + return -EINVAL; + + return 0; +} + /* -------------------------------------------------------------------------- Device Matching -------------------------------------------------------------------------- */ @@ -961,8 +1021,7 @@ void __init acpi_early_init(void) /** * acpi_subsystem_init - Finalize the early initialization of ACPI. * - * Switch over the platform to the ACPI mode (if possible), initialize the - * handling of ACPI events, install the interrupt and global lock handlers. + * Switch over the platform to the ACPI mode (if possible). * * Doing this too early is generally unsafe, but at the same time it needs to be * done before all things that really depend on ACPI. The right spot appears to @@ -990,6 +1049,13 @@ void __init acpi_subsystem_init(void) } } +static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context) +{ + acpi_scan_table_handler(event, table, context); + + return acpi_sysfs_table_handler(event, table, context); +} + static int __init acpi_bus_init(void) { int result; @@ -1043,6 +1109,8 @@ static int __init acpi_bus_init(void) * _PDC control method may load dynamic SSDT tables, * and we need to install the table handler before that. */ + status = acpi_install_table_handler(acpi_bus_table_handler, NULL); + acpi_sysfs_init(); acpi_early_processor_set_pdc(); @@ -1124,6 +1192,7 @@ static int __init acpi_init(void) acpi_sleep_proc_init(); acpi_wakeup_device_init(); acpi_debugger_init(); + acpi_setup_sb_notify_handler(); return 0; } |