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* Merge tag 'virt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds2013-02-2139-878/+3466
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pull ARM virtualization changes: "This contains parts of the ARM KVM support that have dependencies on other patches merged through the arm-soc tree. In combination with patches coming through Russell's tree, this will finally add full support for the kernel based virtual machine on ARM, which has been awaited for some time now. Further, we now have a separate platform for virtual machines and qemu booting that is used by both Xen and KVM, separating these from the Versatile Express reference implementation. Obviously, this new platform is multiplatform capable so it can be combined with existing machines in the same kernel." * tag 'virt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (38 commits) ARM: arch_timer: include linux/errno.h arm: arch_timer: add missing inline in stub function ARM: KVM: arch_timers: Wire the init code and config option ARM: KVM: arch_timers: Add timer world switch ARM: KVM: arch_timers: Add guest timer core support ARM: KVM: Add VGIC configuration option ARM: KVM: VGIC initialisation code ARM: KVM: VGIC control interface world switch ARM: KVM: VGIC interrupt injection ARM: KVM: vgic: retire queued, disabled interrupts ARM: KVM: VGIC virtual CPU interface management ARM: KVM: VGIC distributor handling ARM: KVM: VGIC accept vcpu and dist base addresses from user space ARM: KVM: Initial VGIC infrastructure code ARM: KVM: Keep track of currently running vcpus KVM: ARM: Introduce KVM_ARM_SET_DEVICE_ADDR ioctl ARM: gic: add __ASSEMBLY__ guard to C definitions ARM: gic: define GICH offsets for VGIC support ARM: gic: add missing distributor defintions ARM: mach-virt: fixup machine descriptor after removal of sys_timer ...
| * ARM: arch_timer: include linux/errno.hArnd Bergmann2013-02-151-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Patch 8a4da6e "arm: arch_timer: move core to drivers/clocksource" moved a lot of code out of arch_timer.c, but ended up deleting too much, which broke some configurations. Obviously, include linux/errno.h is required to return error values. Without this patch, building allmodconfig results in: arch/arm/kernel/arch_timer.c: In function 'arch_timer_sched_clock_init': arch/arm/kernel/arch_timer.c:55:11: error: 'ENXIO' undeclared (first use in this function) arch/arm/kernel/arch_timer.c:55:11: note: each undeclared identifier is reported only once for each function it appears in Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com>
| * Merge branch 'kvm-arm/timer' of ↵Olof Johansson2013-02-1218-14/+2581
| |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into next/virt From Marc Zyngier, this branch enables virtual GIC and timer for KVM/ARM. * 'kvm-arm/timer' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms: ARM: KVM: arch_timers: Wire the init code and config option ARM: KVM: arch_timers: Add timer world switch ARM: KVM: arch_timers: Add guest timer core support ARM: KVM: Add VGIC configuration option ARM: KVM: VGIC initialisation code ARM: KVM: VGIC control interface world switch ARM: KVM: VGIC interrupt injection ARM: KVM: vgic: retire queued, disabled interrupts ARM: KVM: VGIC virtual CPU interface management ARM: KVM: VGIC distributor handling ARM: KVM: VGIC accept vcpu and dist base addresses from user space ARM: KVM: Initial VGIC infrastructure code ARM: KVM: Keep track of currently running vcpus KVM: ARM: Introduce KVM_ARM_SET_DEVICE_ADDR ioctl ARM: gic: add __ASSEMBLY__ guard to C definitions ARM: gic: define GICH offsets for VGIC support ARM: gic: add missing distributor defintions
| | * ARM: KVM: arch_timers: Wire the init code and config optionMarc Zyngier2013-02-114-0/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * ARM: KVM: arch_timers: Add timer world switchMarc Zyngier2013-02-115-1/+74
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * ARM: KVM: arch_timers: Add guest timer core supportMarc Zyngier2013-02-115-0/+394
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * Merge branch 'for-arm-soc/arch-timers' of ↵Marc Zyngier2013-02-11802-5425/+14764
| | |\ | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into kvm-arm/timer
| | * | ARM: KVM: Add VGIC configuration optionMarc Zyngier2013-02-111-0/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: VGIC initialisation codeMarc Zyngier2013-02-113-0/+250
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: VGIC control interface world switchMarc Zyngier2013-02-112-0/+86
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: VGIC interrupt injectionMarc Zyngier2013-02-113-10/+170
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: vgic: retire queued, disabled interruptsMarc Zyngier2013-02-111-0/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: VGIC virtual CPU interface managementMarc Zyngier2013-02-112-1/+357
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: VGIC distributor handlingMarc Zyngier2013-02-112-1/+677
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: VGIC accept vcpu and dist base addresses from user spaceChristoffer Dall2013-02-115-1/+90
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: Initial VGIC infrastructure codeMarc Zyngier2013-02-117-1/+275
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: KVM: Keep track of currently running vcpusMarc Zyngier2013-02-112-0/+40
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | KVM: ARM: Introduce KVM_ARM_SET_DEVICE_ADDR ioctlChristoffer Dall2013-02-114-1/+80
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: gic: add __ASSEMBLY__ guard to C definitionsMarc Zyngier2013-02-111-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: gic: define GICH offsets for VGIC supportMarc Zyngier2013-02-111-0/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | ARM: gic: add missing distributor defintionsChristoffer Dall2013-02-111-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | * | Merge remote-tracking branch 'arm-soc/irqchip/gic-vic-move' into kvm-arm/vgicMarc Zyngier2013-01-24147-607/+338
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| * | | | arm: arch_timer: add missing inline in stub functionOlof Johansson2013-02-111-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fixes: In file included from arch/arm/include/asm/arch_timer.h:10:0, from arch/arm/mach-shmobile/timer.c:23: include/clocksource/arm_arch_timer.h:56:28: warning: 'arch_timer_get_timecounter' defined but not used [-Wunused-function] Signed-off-by: Olof Johansson <olof@lixom.net>
| * | | | ARM: mach-virt: fixup machine descriptor after removal of sys_timerWill Deacon2013-02-111-5/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now that sys_timer has been removed, update the mach-virt machine descriptor to use a direct pointer to its timer_init function. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Olof Johansson <olof@lixom.net>
| * | | | Merge branch 'for-arm-soc/virt/mach' of ↵Olof Johansson2013-02-116-0/+135
| |\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into next/virt From Will Deacon, this lays the foundation for a basic virtualzed machine type. * 'for-arm-soc/virt/mach' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux: ARM: mach-virt: add SMP support using PSCI ARM: Dummy Virtual Machine platform support Signed-off-by: Olof Johansson <olof@lixom.net>
| | * | | | ARM: mach-virt: add SMP support using PSCIWill Deacon2013-02-024-0/+64
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support for SMP to mach-virt using the PSCI infrastructure. Acked-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
| | * | | | ARM: Dummy Virtual Machine platform supportMarc Zyngier2013-02-025-0/+71
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for the smallest, dumbest possible platform, to be used as a guest for KVM or other hypervisors. It only mandates a GIC and architected timers. Fits nicely with a multiplatform zImage. Uses very little silicon area. Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Nicolas Pitre <nico@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> [will: fixed up conflicts with GIC move to drivers/irqchip/] Signed-off-by: Will Deacon <will.deacon@arm.com>
| | * | | | Merge branch 'irqchip/gic-vic-move' of ↵Will Deacon2013-02-02147-607/+338
| | |\ \ \ \ | | | | |/ / | | | |/| | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc into for-arm-soc/virt/mach
| | * | | | Merge branch 'for-rmk/virt/psci' into for-arm-soc/virt/machWill Deacon2013-02-017-0/+338
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| * | | | | Merge branch 'depends/cleanup' into next/virtOlof Johansson2013-02-11547-1734/+1018
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| * \ \ \ \ \ Merge branch 'depends/rmk-psci' into next/virtOlof Johansson2013-02-117-0/+338
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| * | | | | | Merge branch 'irqchip/gic-vic-move' into next/virtOlof Johansson2013-02-11147-607/+338
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| * | | | | | Merge branch 'for-arm-soc/arch-timers' of ↵Olof Johansson2013-02-1115-855/+748
| |\ \ \ \ \ \ | | | |_|_|/ / | | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into next/virt From Will Deacon: This set of changes moves the arch-timer driver out from arch/arm/ and into drivers/clocksource and unifies the new driver with the arm64 copy. * 'for-arm-soc/arch-timers' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux: ARM: arch_timers: switch to physical timers if HYP mode is available Documentation: Add ARMv8 to arch_timer devicetree arm64: move from arm_generic to arm_arch_timer arm64: arm_generic: prevent reading stale time arm: arch_timer: move core to drivers/clocksource arm: arch_timer: add arch_counter_set_user_access arm: arch_timer: divorce from local_timer api arm: arch_timer: add isbs to register accessors arm: arch_timer: factor out register accessors arm: arch_timer: split cntfrq accessor arm: arch_timer: standardise counter reading arm: arch_timer: use u64/u32 for register data arm: arch_timer: remove redundant available check arm: arch_timer: balance device_node refcounting Signed-off-by: Olof Johansson <olof@lixom.net>
| | * | | | | Merge branch 'for-will/arch-timer-unification' of ↵Will Deacon2013-02-0115-855/+748
| | |\ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | git://linux-arm.org/linux-mr into for-arm-soc/arch-timers
| | | * | | | | ARM: arch_timers: switch to physical timers if HYP mode is availableMarc Zyngier2013-01-311-1/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | Documentation: Add ARMv8 to arch_timer devicetreeMark Rutland2013-01-311-3/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm64: move from arm_generic to arm_arch_timerMark Rutland2013-01-319-363/+162
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm64: arm_generic: prevent reading stale timeMark Rutland2013-01-311-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: move core to drivers/clocksourceMark Rutland2013-01-318-386/+476
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: add arch_counter_set_user_accessMark Rutland2013-01-312-0/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: divorce from local_timer apiMark Rutland2013-01-311-23/+29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: add isbs to register accessorsMark Rutland2013-01-311-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: factor out register accessorsMark Rutland2013-01-312-92/+94
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: split cntfrq accessorMark Rutland2013-01-311-7/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: standardise counter readingMark Rutland2013-01-311-36/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: use u64/u32 for register dataMark Rutland2013-01-311-19/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: remove redundant available checkMark Rutland2013-01-311-12/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| | | * | | | | arm: arch_timer: balance device_node refcountingMark Rutland2013-01-311-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * | | | | | | Merge branch 'for-rmk/broadcast' of ↵Olof Johansson2013-02-115-9/+48
| |\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into next/virt * 'for-rmk/broadcast' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux: arm: Add generic timer broadcast support arm: Use generic timer broadcast receiver clockevents: Add generic timer broadcast function clockevents: Add generic timer broadcast receiver
| | * | | | | | Merge branch 'clocks/broadcast-arm' of git://linux-arm.org/linux-mr into ↵Will Deacon2013-02-012-9/+5
| | |\ \ \ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | for-rmk/broadcast