diff options
| author | Matt Fleming <matt@codeblueprint.co.uk> | 2016-04-25 21:06:59 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-04-28 11:34:03 +0200 |
| commit | f0133f3c5b8bb34ec4dec50c27e7a655aeee8935 (patch) | |
| tree | 77cc29480d4aac1168560722f4bcb3c2b7658667 /drivers/firmware/efi/reboot.c | |
| parent | 806b0351c9ff9890c1ef0ba2c46237baef49ac79 (diff) | |
efi: Add 'capsule' update support
The EFI capsule mechanism allows data blobs to be passed to the EFI
firmware. A common use case is performing firmware updates. This patch
just introduces the main infrastructure for interacting with the
firmware, and a driver that allows users to upload capsules will come
in a later patch.
Once a capsule has been passed to the firmware, the next reboot must
be performed using the ResetSystem() EFI runtime service, which may
involve overriding the reboot type specified by reboot=. This ensures
the reset value returned by QueryCapsuleCapabilities() is used to
reset the system, which is required for the capsule to be processed.
efi_capsule_pending() is provided for this purpose.
At the moment we only allow a single capsule blob to be sent to the
firmware despite the fact that UpdateCapsule() takes a 'CapsuleCount'
parameter. This simplifies the API and shouldn't result in any
downside since it is still possible to send multiple capsules by
repeatedly calling UpdateCapsule().
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Cc: Kweh Hock Leong <hock.leong.kweh@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Peter Jones <pjones@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: joeyli <jlee@suse.com>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-28-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/firmware/efi/reboot.c')
| -rw-r--r-- | drivers/firmware/efi/reboot.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c index 9c59d1c795d1..62ead9b9d871 100644 --- a/drivers/firmware/efi/reboot.c +++ b/drivers/firmware/efi/reboot.c @@ -9,7 +9,8 @@ int efi_reboot_quirk_mode = -1; void efi_reboot(enum reboot_mode reboot_mode, const char *__unused) { - int efi_mode; + const char *str[] = { "cold", "warm", "shutdown", "platform" }; + int efi_mode, cap_reset_mode; if (!efi_enabled(EFI_RUNTIME_SERVICES)) return; @@ -30,6 +31,15 @@ void efi_reboot(enum reboot_mode reboot_mode, const char *__unused) if (efi_reboot_quirk_mode != -1) efi_mode = efi_reboot_quirk_mode; + if (efi_capsule_pending(&cap_reset_mode)) { + if (efi_mode != cap_reset_mode) + printk(KERN_CRIT "efi: %s reset requested but pending " + "capsule update requires %s reset... Performing " + "%s reset.\n", str[efi_mode], str[cap_reset_mode], + str[cap_reset_mode]); + efi_mode = cap_reset_mode; + } + efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL); } |