linux-sg2042/drivers/scsi/isci
Matt Fleming 83e6818974 efi: Make 'efi_enabled' a function to query EFI facilities
Originally 'efi_enabled' indicated whether a kernel was booted from
EFI firmware. Over time its semantics have changed, and it now
indicates whether or not we are booted on an EFI machine with
bit-native firmware, e.g. 64-bit kernel with 64-bit firmware.

The immediate motivation for this patch is the bug report at,

    https://bugs.launchpad.net/ubuntu-cdimage/+bug/1040557

which details how running a platform driver on an EFI machine that is
designed to run under BIOS can cause the machine to become
bricked. Also, the following report,

    https://bugzilla.kernel.org/show_bug.cgi?id=47121

details how running said driver can also cause Machine Check
Exceptions. Drivers need a new means of detecting whether they're
running on an EFI machine, as sadly the expression,

    if (!efi_enabled)

hasn't been a sufficient condition for quite some time.

Users actually want to query 'efi_enabled' for different reasons -
what they really want access to is the list of available EFI
facilities.

For instance, the x86 reboot code needs to know whether it can invoke
the ResetSystem() function provided by the EFI runtime services, while
the ACPI OSL code wants to know whether the EFI config tables were
mapped successfully. There are also checks in some of the platform
driver code to simply see if they're running on an EFI machine (which
would make it a bad idea to do BIOS-y things).

This patch is a prereq for the samsung-laptop fix patch.

Cc: David Airlie <airlied@linux.ie>
Cc: Corentin Chary <corentincj@iksaif.net>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Olof Johansson <olof@lixom.net>
Cc: Peter Jones <pjones@redhat.com>
Cc: Colin Ian King <colin.king@canonical.com>
Cc: Steve Langasek <steve.langasek@canonical.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Konrad Rzeszutek Wilk <konrad@kernel.org>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: <stable@vger.kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2013-01-30 11:51:59 -08:00
..
Makefile isci: merge sata.[ch] into request.c 2011-07-03 04:04:52 -07:00
host.c SCSI for-linus on 20121002 2012-10-02 19:01:32 -07:00
host.h [SCSI] isci: implement suspend/resume support 2012-08-24 13:10:24 +04:00
init.c efi: Make 'efi_enabled' a function to query EFI facilities 2013-01-30 11:51:59 -08:00
isci.h [SCSI] isci: oem parameter format v1.3 (cable select) 2012-01-16 11:43:04 +04:00
phy.c isci: add a couple __iomem annotations 2012-07-03 12:09:32 -07:00
phy.h isci: kill sci_phy_protocol and sci_request_protocol 2012-05-17 12:27:11 -07:00
port.c scsi: fix various printk and comment typos 2012-09-01 08:24:35 -07:00
port.h isci: Manage the link layer hang detect timer for RNC suspensions. 2012-05-17 14:33:36 -07:00
port_config.c isci: fix 'link-up' events occur after 'start-complete' 2012-05-17 12:27:12 -07:00
probe_roms.c isci: fix isci_pci_probe() generates warning on efi failure path 2012-07-03 12:09:30 -07:00
probe_roms.h isci: refactor initialization for S3/S4 2012-05-17 12:27:12 -07:00
registers.h isci: Changes in COMSAS timings enabling ISCI to detect buggy disc drives. 2012-05-17 12:27:28 -07:00
remote_device.c isci: End the RNC resumption wait when the RNC is destroyed. 2012-05-17 14:33:44 -07:00
remote_device.h isci: Restore the ATAPI device RNC management code. 2012-05-17 14:33:43 -07:00
remote_node_context.c isci: End the RNC resumption wait when the RNC is destroyed. 2012-05-17 14:33:44 -07:00
remote_node_context.h isci: make function declaration match implementation 2012-07-03 12:09:31 -07:00
remote_node_table.c isci: retire scic_sds_ and scic_ prefixes 2011-07-03 04:04:52 -07:00
remote_node_table.h isci: retire scic_sds_ and scic_ prefixes 2011-07-03 04:04:52 -07:00
request.c [SCSI] isci: copy fis 0x34 response into proper buffer 2012-11-13 13:45:14 +00:00
request.h isci: Remove obviated host callback list. 2012-05-17 14:33:44 -07:00
sas.h [SCSI] isci: fix support for large smp requests 2011-10-02 13:07:17 -05:00
scu_completion_codes.h isci: Handle all suspending TC completions 2012-05-17 14:33:37 -07:00
scu_event_codes.h isci: uplevel register hardware data structures and unsolicited frame handling 2011-07-03 04:04:47 -07:00
scu_remote_node_context.h isci: move remote_device handling out of the core 2011-07-03 04:00:38 -07:00
scu_task_context.h [SCSI] isci: T10 DIF support 2012-02-19 09:14:24 -06:00
task.c treewide: fix comment/printk/variable typos 2012-09-01 10:33:05 -07:00
task.h isci: Redesign device suspension, abort, cleanup. 2012-05-17 14:33:38 -07:00
unsolicited_frame_control.c isci: refactor initialization for S3/S4 2012-05-17 12:27:12 -07:00
unsolicited_frame_control.h isci: refactor initialization for S3/S4 2012-05-17 12:27:12 -07:00