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authorMatt Fleming <matt.fleming@intel.com>2014-06-13 12:35:21 +0100
committerMatt Fleming <matt.fleming@intel.com>2014-07-18 21:23:52 +0100
commit0c5ed61adbdbf2ca5de934642d5be1e971c498c1 (patch)
tree99c8e1a6e69d58b3902118dcfcd8a261b67ff254 /include/linux/efi.h
parent8562c99cdd30217dea3609e268572f8764f401a5 (diff)
downloadblackbird-op-linux-0c5ed61adbdbf2ca5de934642d5be1e971c498c1.tar.gz
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efi/reboot: Allow powering off machines using EFI
Not only can EfiResetSystem() be used to reboot, it can also be used to power down machines. By and large, this functionality doesn't work very well across the range of EFI machines in the wild, so it should definitely only be used as a last resort. In an ideal world, this wouldn't be needed at all. Unfortunately, we're starting to see machines where EFI is the *only* reliable way to power down, and nothing else, not PCI, not ACPI, works. efi_poweroff_required() should be implemented on a per-architecture basis, since exactly when we should be using EFI runtime services is a platform-specific decision. There's no analogue for reboot because each architecture handles reboot very differently - the x86 code in particular is pretty complex. Patches to enable this for specific classes of hardware will be submitted separately. Tested-by: Mark Salter <msalter@redhat.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'include/linux/efi.h')
-rw-r--r--include/linux/efi.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/efi.h b/include/linux/efi.h
index e6980ba528ec..9917f58ee83e 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -878,6 +878,8 @@ extern void efi_reserve_boot_services(void);
extern int efi_get_fdt_params(struct efi_fdt_params *params, int verbose);
extern struct efi_memory_map memmap;
+extern bool efi_poweroff_required(void);
+
/* Iterate through an efi_memory_map */
#define for_each_efi_memory_desc(m, md) \
for ((md) = (m)->map; \
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