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2013-02-11ARM: KVM: arch_timers: Wire the init code and config optionv3.9-kvm-armMarc Zyngier
It is now possible to select CONFIG_KVM_ARM_TIMER to enable the KVM architected timer support. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: arch_timers: Add timer world switchMarc Zyngier
Do the necessary save/restore dance for the timers in the world switch code. In the process, allow the guest to read the physical counter, which is useful for its own clock_event_device. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: arch_timers: Add guest timer core supportMarc Zyngier
Add some the architected timer related infrastructure, and support timer interrupt injection, which can happen as a resultof three possible events: - The virtual timer interrupt has fired while we were still executing the guest - The timer interrupt hasn't fired, but it expired while we were doing the world switch - A hrtimer we programmed earlier has fired Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11Merge branch 'for-arm-soc/arch-timers' of ↵Marc Zyngier
git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into kvm-arm/timer
2013-02-11ARM: KVM: Add VGIC configuration optionMarc Zyngier
It is now possible to select the VGIC configuration option. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: VGIC initialisation codeMarc Zyngier
Add the init code for the hypervisor, the virtual machine, and the virtual CPUs. An interrupt handler is also wired to allow the VGIC maintenance interrupts, used to deal with level triggered interrupts and LR underflows. A CPU hotplug notifier is registered to disable/enable the interrupt as requested. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: VGIC control interface world switchMarc Zyngier
Enable the VGIC control interface to be save-restored on world switch. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: VGIC interrupt injectionMarc Zyngier
Plug the interrupt injection code. Interrupts can now be generated from user space. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: vgic: retire queued, disabled interruptsMarc Zyngier
An interrupt may have been disabled after being made pending on the CPU interface (the classic case is a timer running while we're rebooting the guest - the interrupt would kick as soon as the CPU interface gets enabled, with deadly consequences). The solution is to examine already active LRs, and check the interrupt is still enabled. If not, just retire it. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: VGIC virtual CPU interface managementMarc Zyngier
Add VGIC virtual CPU interface code, picking pending interrupts from the distributor and stashing them in the VGIC control interface list registers. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: VGIC distributor handlingMarc Zyngier
Add the GIC distributor emulation code. A number of the GIC features are simply ignored as they are not required to boot a Linux guest. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: VGIC accept vcpu and dist base addresses from user spaceChristoffer Dall
User space defines the model to emulate to a guest and should therefore decide which addresses are used for both the virtual CPU interface directly mapped in the guest physical address space and for the emulated distributor interface, which is mapped in software by the in-kernel VGIC support. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: Initial VGIC infrastructure codeMarc Zyngier
Wire the basic framework code for VGIC support and the initial in-kernel MMIO support code for the VGIC, used for the distributor emulation. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: Keep track of currently running vcpusMarc Zyngier
When an interrupt occurs for the guest, it is sometimes necessary to find out which vcpu was running at that point. Keep track of which vcpu is being run in kvm_arch_vcpu_ioctl_run(), and allow the data to be retrieved using either: - kvm_arm_get_running_vcpu(): returns the vcpu running at this point on the current CPU. Can only be used in a non-preemptible context. - kvm_arm_get_running_vcpus(): returns the per-CPU variable holding the running vcpus, usable for per-CPU interrupts. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11KVM: ARM: Introduce KVM_ARM_SET_DEVICE_ADDR ioctlChristoffer Dall
On ARM some bits are specific to the model being emulated for the guest and user space needs a way to tell the kernel about those bits. An example is mmio device base addresses, where KVM must know the base address for a given device to properly emulate mmio accesses within a certain address range or directly map a device with virtualiation extensions into the guest address space. We make this API ARM-specific as we haven't yet reached a consensus for a generic API for all KVM architectures that will allow us to do something like this. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: gic: add __ASSEMBLY__ guard to C definitionsMarc Zyngier
The GIC include file being used by some of the KVM assembly code, wrap the C definitions with a #ifdef __ASSEMBLY__ guard. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: gic: define GICH offsets for VGIC supportMarc Zyngier
The GICH_* constants are defined by the GIC HW spec, and even though they only be used by KVM to begin with, define them generically in gic.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: gic: add missing distributor defintionsChristoffer Dall
Add missing register map offsets for the distributor and rename GIC_DIST_ACTIVE_BIT to GIC_DIST_ACTIVE_SET to be consistent. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-01Merge branch 'for-will/arch-timer-unification' of ↵Will Deacon
git://linux-arm.org/linux-mr into for-arm-soc/arch-timers
2013-02-01Merge branch 'clocks/broadcast-arm' of git://linux-arm.org/linux-mr into ↵Will Deacon
for-rmk/broadcast
2013-02-01Merge branch 'timers/for-arm' of ↵Will Deacon
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into for-rmk/broadcast
2013-02-01arm: Add generic timer broadcast supportMark Rutland
Implement timer_broadcast for the arm architecture, allowing for the use of clock_event_device_drivers decoupled from the timer tick broadcast mechanism. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
2013-02-01arm: Use generic timer broadcast receiverMark Rutland
Currently, the ARM backend must maintain a redundant list of timers for the purpose of centralising timer broadcast functionality. This prevents sharing timer drivers across architectures. This patch moves the pain of dealing with timer broadcasts to the core clockevents tick broadcast code, which already maintains its own list of timers. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
2013-01-31clockevents: Add generic timer broadcast functionMark Rutland
Currently, the timer broadcast mechanism is defined by a function pointer on struct clock_event_device. As the fundamental mechanism for broadcast is architecture-specific, this means that clock_event_device drivers cannot be shared across multiple architectures. This patch adds an (optional) architecture-specific function for timer tick broadcast, allowing drivers which may require broadcast functionality to be shared across multiple architectures. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: linux-arm-kernel@lists.infradead.org Cc: nico@linaro.org Cc: Will.Deacon@arm.com Cc: Marc.Zyngier@arm.com Cc: john.stultz@linaro.org Link: http://lkml.kernel.org/r/1358183124-28461-3-git-send-email-mark.rutland@arm.com Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-01-31clockevents: Add generic timer broadcast receiverMark Rutland
Currently the broadcast mechanism used for timers is abstracted by a function pointer on struct clock_event_device. As the fundamental mechanism for broadcast is architecture-specific, this ties each clock_event_device driver to a single architecture, even where the driver is otherwise generic. This patch adds a standard path for the receipt of timer broadcasts, so drivers and/or architecture backends need not manage redundant lists of timers for the purpose of routing broadcast timer ticks. [tglx: Made the implementation depend on the config switch as well ] Signed-off-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: linux-arm-kernel@lists.infradead.org Cc: nico@linaro.org Cc: Will.Deacon@arm.com Cc: Marc.Zyngier@arm.com Cc: john.stultz@linaro.org Link: http://lkml.kernel.org/r/1358183124-28461-2-git-send-email-mark.rutland@arm.com Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2013-01-31ARM: arch_timers: switch to physical timers if HYP mode is availableMarc Zyngier
If we're booted in HYP mode, it is possible that we'll run some kind of virtualized environment. In this case, it is a better to switch to the physical timers, and leave the virtual timers to guests. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2013-01-31Documentation: Add ARMv8 to arch_timer devicetreeMark Rutland
Currently the documentation for the arch_timer devicetree binding only lists "arm,armv7-timer". Add "arm,armv8-timer" to the list of compatible strings. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
2013-01-31arm64: move from arm_generic to arm_arch_timerMark Rutland
The arch_timer driver supports a superset of the functionality of the arm_generic driver, and is not tied to a particular arch. This patch moves arm64 to use the arch_timer driver, gaining additional functionality in doing so, and removes the (now unused) arm_generic driver. Timer-related hooks specific to arm64 are moved into arch/arm64/kernel/time.c. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
2013-01-31arm64: arm_generic: prevent reading stale timeMark Rutland
Currently arch_counter_get_cnt{p,v}ct can be speculated, allowing for stale time values to be read. This could be problematic for the delay loop and other sensitive functions, as the time delta could jump around unexpectedly. This patch adds isbs to arch_counter_get_cnt{p,v}ct, preventing this possibility. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2013-01-31arm: arch_timer: move core to drivers/clocksourceMark Rutland
The core functionality of the arch_timer driver is not directly tied to anything under arch/arm, and can be split out. This patch factors out the core of the arch_timer driver, so it can be shared with other architectures. A couple of functions are added so that architecture-specific code can interact with the driver without needing to touch its internals. The ARM_ARCH_TIMER config variable is moved out to drivers/clocksource/Kconfig, existing uses in arch/arm are replaced with HAVE_ARM_ARCH_TIMER, which selects it. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
2013-01-31arm: arch_timer: add arch_counter_set_user_accessMark Rutland
Several bits in CNTKCTL reset to 0, including PL0VTEN. For architectures using the generic timer which wish to have a fast gettimeofday vDSO implementation, these bits must be set to 1 by the kernel. For architectures without a vDSO, it's best to leave the bits set to 0 for now to ensure that if and when support is added, it's implemented sanely architecture wide. As the bootloader might set PL0VTEN to a value that doesn't correspond to that which the kernel prefers, we must explicitly set it to the architecture port's preferred value. This patch adds arch_counter_set_user_access, which sets the PL0 access permissions to that required by the architecture. For arch/arm, this currently means disabling all userspace access. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2013-01-31arm: arch_timer: divorce from local_timer apiMark Rutland
Currently, the arch_timer driver is tied to the arm port, as it relies on code in arch/arm/smp.c to setup and teardown timers as cores are hotplugged on and off. The timer is registered through an arm-specific registration mechanism, preventing sharing the driver with the arm64 port. This patch moves the driver to using a cpu notifier instead, making it easier to port. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
2013-01-31arm: arch_timer: add isbs to register accessorsMark Rutland
Without the isbs in arch_timer_get_cnt{p,v}ct the cpu may speculate reads and return stale values. This could be bad for code sensitive to changes in expected deltas between calls (e.g. the delay loop). Without isbs in arch_timer_reg_write the processor may reorder instructions around enabling/disabling of the timer or writing the compare value, which we probably don't want. This patch adds isbs to prevent those issues. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2013-01-31arm: arch_timer: factor out register accessorsMark Rutland
Currently the arch_timer register accessors are thrown together with the main driver, preventing us from porting the driver to other architectures. This patch moves the register accessors into a header file, as with the arm64 version. Constants required by the accessors are also moved. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
2013-01-31arm: arch_timer: split cntfrq accessorMark Rutland
The CNTFRQ register is not duplicated for physical and virtual timers, and accessing it as if it were is confusing. Instead, use a separate accessor which doesn't take the access type as a parameter. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
2013-01-31arm: arch_timer: standardise counter readingMark Rutland
We're currently inconsistent with respect to our accesses to the physical and virtual counters, mixing and matching the two. This patch introduces and uses a function pointer for accessing the correct counter based on whether we're using physical or virtual interrupts. All current accesses to the counter accessors are redirected through it. When the driver is moved out to drivers/clocksource, there's the possibility that code called before the timer code is initialised will attempt to call arch_timer_read_counter (e.g. sched_clock for AArch64). To avoid having to have to check whether the timer has been initialised either in arch_timer_read_counter or one of it's callers, a default implementation is assigned that simply returns 0. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
2013-01-31arm: arch_timer: use u64/u32 for register dataMark Rutland
To ensure the correct size of types, use u64 for the return value of arch_timer_get_cnt{p,v}ct, and u32 for arch_timer_rate, matching the size of the registers these values are taken from. While we're changing them anyway, simplify the implementation of arch_timer_get_cnt{p,v}ct. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
2013-01-31arm: arch_timer: remove redundant available checkMark Rutland
This check is a holdover from the pre-devicetree days. As the timer is not probed except by platforms which register it via devicetree, it's not strictly necessary. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
2013-01-31arm: arch_timer: balance device_node refcountingMark Rutland
When we get the device_node for the arch timer, it's refcount is automatically incremented in of_find_matching_node, but it is never decremented. This patch decrements the refcount on the node after we're finished using it. Reported-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com>
2013-01-31Merge branch 'x86-efi-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 EFI fixes from Peter Anvin: "This is a collection of fixes for the EFI support. The controversial bit here is a set of patches which bumps the boot protocol version as part of fixing some serious problems with the EFI handover protocol, used when booting under EFI using a bootloader as opposed to directly from EFI. These changes should also make it a lot saner to support cross-mode 32/64-bit EFI booting in the future. Getting these changes into 3.8 means we avoid presenting an inconsistent ABI to bootloaders. Other changes are display detection and fixing efivarfs." * 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, efi: remove attribute check from setup_efi_pci x86, build: Dynamically find entry points in compressed startup code x86, efi: Fix PCI ROM handing in EFI boot stub, in 32-bit mode x86, efi: Fix 32-bit EFI handover protocol entry point x86, efi: Fix display detection in EFI boot stub x86, boot: Define the 2.12 bzImage boot protocol x86/boot: Fix minor fd leakage in tools/relocs.c x86, efi: Set runtime_version to the EFI spec revision x86, efi: fix 32-bit warnings in setup_efi_pci() efivarfs: Delete dentry from dcache in efivarfs_file_write() efivarfs: Never return ENOENT from firmware efi, x86: Pass a proper identity mapping in efi_call_phys_prelog efivarfs: Drop link count of the right inode
2013-01-31Merge branch 'x86-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fixes from Peter Anvin: "This is a collection of miscellaneous fixes, the most important one is the fix for the Samsung laptop bricking issue (auto-blacklisting the samsung-laptop driver); the efi_enabled() changes you see below are prerequisites for that fix. The other issues fixed are booting on OLPC XO-1.5, an UV fix, NMI debugging, and requiring CAP_SYS_RAWIO for MSR references, just as with I/O port references." * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: samsung-laptop: Disable on EFI hardware efi: Make 'efi_enabled' a function to query EFI facilities smp: Fix SMP function call empty cpu mask race x86/msr: Add capabilities check x86/dma-debug: Bump PREALLOC_DMA_DEBUG_ENTRIES x86/olpc: Fix olpc-xo1-sci.c build errors arch/x86/platform/uv: Fix incorrect tlb flush all issue x86-64: Fix unwind annotations in recent NMI changes x86-32: Start out cr0 clean, disable paging before modifying cr3/4
2013-01-31Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linuxLinus Torvalds
Pull console lockdep checking revert from Dave Airlie. The lockdep splat this showed was interesting, but it's very very old, and we won't be fixing it until 3.9. In the meantime, undo the lockdep annotation so that we don't generate the (known) console lockdep issue, and then possibly hide any potential other (unknown) lockdep problems that got disabled by the first one that triggered. * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: Revert "console: implement lockdep support for console_lock"
2013-01-31Revert "console: implement lockdep support for console_lock"Dave Airlie
This reverts commit daee779718a319ff9f83e1ba3339334ac650bb22. I'll requeue this after the console locking fixes, so lockdep is useful again for people until fbcon is fixed. Signed-off-by: Dave Airlie <airlied@redhat.com>
2013-01-30Merge tag 'efi-for-3.8' into x86/efiH. Peter Anvin
Various urgent EFI fixes and some warning cleanups for v3.8 * EFI boot stub fix for Macbook Pro's from Maarten Lankhorst * Fix an oops in efivarfs from Lingzhu Xiang * 32-bit warning cleanups from Jan Beulich * Patch to Boot on >512GB RAM systems from Nathan Zimmer * Set efi.runtime_version correctly * efivarfs updates Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2013-01-30samsung-laptop: Disable on EFI hardwareMatt Fleming
It has been reported that running this driver on some Samsung laptops with EFI can cause those machines to become bricked as detailed in the following report, https://bugs.launchpad.net/ubuntu-cdimage/+bug/1040557 There have also been reports of this driver causing Machine Check Exceptions on recent EFI-enabled Samsung laptops, https://bugzilla.kernel.org/show_bug.cgi?id=47121 So disable it if booting from EFI since this driver relies on grovelling around in the BIOS memory map which isn't going to work. Cc: Corentin Chary <corentincj@iksaif.net> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Colin Ian King <colin.king@canonical.com> Cc: Steve Langasek <steve.langasek@canonical.com> Cc: <stable@vger.kernel.org> Signed-off-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2013-01-30efi: Make 'efi_enabled' a function to query EFI facilitiesMatt Fleming
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>
2013-01-30Merge tag 'edac_for_3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bpLinus Torvalds
Pull EDAC fixlets from Borislav Petkov: "Two minor correctness fixlets from Dan Carpenter and Joe Perches each." * tag 'edac_for_3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp: EDAC: Fix kcalloc argument order EDAC: Test correct variable in ->store function
2013-01-30Merge tag 'sound-3.8' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound Pull sound fixes from Takashi Iwai: - A collection of small ASoC driver fixes (error path fixes, register correction, regulator bypass mode fix, etc) - A few regression fixes and quirks of HD-audio (wrong page attributes for SG-buffer, Poulsbo/Oaktrail controller fix, digital mic fix for Acer, etc) - A fix for USB-audio UAC2 devices wrt FU length check * tag 'sound-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: hda - Fix non-snoop page handling ALSA: hda - Enable LPIB delay count for Poulsbo / Oaktrail ALSA: hda - fix inverted internal mic on Acer AOA150/ZG5 ALSA: usb-audio: fix invalid length check for RME and other UAC 2 devices ALSA: hda - Add a fixup for Packard-Bell desktop with ALC880 ASoC: wm_adsp: Release firmware on error ASoC: wm_adsp: Use GFP_DMA for things that may be DMAed ASoC: arizona: Use actual rather than desired BCLK when calculating LRCLK ASoC: wm2200: correct mixer values and text ASoC: MAINTAINERS: Update email address. ASoC: wm5110: Correct AEC loopback mask ASoC: wm5102: Correct AEC loopback mask ASoC: dapm: Fix sense of regulator bypass mode ASoC: fsl: fix multiple definition of init_module ASoC: arizona: Disable free-running mode on FLL1
2013-01-30EDAC: Fix kcalloc argument orderJoe Perches
First number, then size. Signed-off-by: Joe Perches <joe@perches.com> Cc: <stable@vger.kernel.org> Signed-off-by: Borislav Petkov <bp@suse.de>
2013-01-30EDAC: Test correct variable in ->store functionDan Carpenter
We're testing for ->show but calling ->store(). Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: stable@vger.kernel.org Signed-off-by: Borislav Petkov <bp@suse.de>