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2013-12-20arm64: dts: Reduce size of virtio block device for foundation modelMark Brown1-1/+1
Will Deacon observed that kvmtool uses a size of 0x200 for virtio block memory region and that the virtio block spec only uses 31 bytes in the device specific region at 0x100 so reduce the region to a less wasteful 0x200. Signed-off-by: Mark Brown <broonie@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-20arm64: Remove unused __data_loc variableGeoff Levand2-12/+0
The __data_loc variable is an unused left over from the 32 bit arm implementation. Remove that variable and adjust the __mmap_switched startup routine accordingly. Signed-off-by: Geoff Levand <geoff@infradead.org> for Huawei, Linaro Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19Merge tag 'arm64-suspend' of git://linux-arm.org/linux-2.6-lp into upstreamCatalin Marinas17-70/+737
* tag 'arm64-suspend' of git://linux-arm.org/linux-2.6-lp: arm64: add CPU power management menu/entries arm64: kernel: add PM build infrastructure arm64: kernel: add CPU idle call arm64: enable generic clockevent broadcast arm64: kernel: implement HW breakpoints CPU PM notifier arm64: kernel: refactor code to install/uninstall breakpoints arm: kvm: implement CPU PM notifier arm64: kernel: implement fpsimd CPU PM notifier arm64: kernel: cpu_{suspend/resume} implementation arm64: kernel: suspend/resume registers save/restore arm64: kernel: build MPIDR_EL1 hash function data structure arm64: kernel: add MPIDR_EL1 accessors macros Conflicts: arch/arm64/Kconfig
2013-12-19arm64: Enable CMALaura Abbott4-2/+56
arm64 bit targets need the features CMA provides. Add the appropriate hooks, header files, and Kconfig to allow this to happen. Cc: Will Deacon <will.deacon@arm.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: Warn on NULL device structure for dma APIsLaura Abbott1-0/+10
Although parts of the DMA apis may properly check for NULL devices, there may be some places that don't. Rather than fix up all the possible locations, just require a non-NULL device structure to be used for allocating/freeing. Cc: Will Deacon <will.deacon@arm.com> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Laura Abbott <lauraa@codeaurora.org> [catalin.marinas@arm.com: s/WARN/WARN_ONCE/] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: Add hwcaps for crypto and CRC32 extensions.Steve Capper2-1/+42
Advertise the optional cryptographic and CRC32 instructions to user space where present. Several hwcap bits [3-7] are allocated. Signed-off-by: Steve Capper <steve.capper@linaro.org> [bit 2 is taken now so use bits 3-7 instead] Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: drop redundant macros from read_cpuid()Ard Biesheuvel1-14/+4
asm/cputype.h contains a bunch of #defines for CPU id registers that essentially map to themselves. Remove the #defines and pass the tokens directly to the inline asm() that reads the registers. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: Remove outdated commentLiviu Dudau1-5/+0
Code referenced in the comment has moved to arch/arm64/kernel/cputable.c Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: cmpxchg: update macros to prevent warningsMark Hambleton1-11/+17
Make sure the value we are going to return is referenced in order to avoid warnings from newer GCCs such as: arch/arm64/include/asm/cmpxchg.h:162:3: warning: value computed is not used [-Wunused-value] ((__typeof__(*(ptr)))__cmpxchg_mb((ptr), \ ^ net/netfilter/nf_conntrack_core.c:674:2: note: in expansion of macro ‘cmpxchg’ cmpxchg(&nf_conntrack_hash_rnd, 0, rand); [Modified to use the current underlying implementation as current mainline for both cmpxchg() and cmpxchg_local() does -- broonie] Signed-off-by: Mark Hambleton <mahamble@broadcom.com> Signed-off-by: Mark Brown <broonie@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: support single-step and breakpoint handler hooksSandeepa Prabhu3-1/+110
AArch64 Single Steping and Breakpoint debug exceptions will be used by multiple debug framworks like kprobes & kgdb. This patch implements the hooks for those frameworks to register their own handlers for handling breakpoint and single step events. Reworked the debug exception handler in entry.S: do_dbg to route software breakpoint (BRK64) exception to do_debug_exception() Signed-off-by: Sandeepa Prabhu <sandeepa.prabhu@linaro.org> Signed-off-by: Deepak Saxena <dsaxena@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19ARM64: fix framepointer check in unwind_frameKonstantin Khlebnikov1-1/+1
We need at least 24 bytes above frame pointer. Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19ARM64: check stack pointer in get_wchanKonstantin Khlebnikov1-2/+5
get_wchan() is lockless. Task may wakeup at any time and change its own stack, thus each next stack frame may be overwritten and filled with random stuff. Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: kconfig: select HAVE_EFFICIENT_UNALIGNED_ACCESSWill Deacon1-0/+1
ARMv8 CPUs can perform efficient unaligned memory accesses in hardware and this feature is relied up on by code such as the dcache word-at-a-time name hashing. This patch selects HAVE_EFFICIENT_UNALIGNED_ACCESS for arm64. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: dcache: select DCACHE_WORD_ACCESS for little-endian CPUsWill Deacon2-0/+41
DCACHE_WORD_ACCESS uses the word-at-a-time API for optimised string comparisons in the vfs layer. This patch implements support for load_unaligned_zeropad in much the same way as has been done for ARM, although big-endian systems are also supported. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: futex: ensure .fixup entries are sufficiently alignedWill Deacon1-0/+1
AArch64 instructions must be 4-byte aligned, so make sure this is true for the futex .fixup section. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: use generic strnlen_user and strncpy_from_user functionsWill Deacon7-127/+64
This patch implements the word-at-a-time interface for arm64 using the same algorithm as ARM. We use the fls64 macro, which expands to a clz instruction via a compiler builtin. Big-endian configurations make use of the implementation from asm-generic. With this implemented, we can replace our byte-at-a-time strnlen_user and strncpy_from_user functions with the optimised generic versions. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: percpu: implement optimised pcpu access using tpidr_el1Will Deacon4-3/+55
This patch implements optimised percpu variable accesses using the el1 r/w thread register (tpidr_el1) along the same lines as arch/arm/. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: perf: add support for percpu pmu interruptVinayak Kale1-30/+78
Add support for irq registration when pmu interrupt is percpu. Signed-off-by: Vinayak Kale <vkale@apm.com> Signed-off-by: Tuan Phan <tphan@apm.com> [will: tidied up cross-calling to pass &irq] Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: vmlinux.lds.S: drop redundant .commentMark Rutland1-1/+0
We currently try to emit .comment twice, once in STABS_DEBUG, and once in the line immediately following it. As the two section definitions are identical, the latter is redundant and can be dropped. This patch drops the redundant .comment section definition. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: dts: Add a virtio disk to the RTSM motherboardMark Hambleton1-0/+6
Describe the virtio device so we can mount disk images in the simulator. [Reduced the size of the region based on feedback from review -- broonie] Signed-off-by: Mark Hambleton <mahamble@broadcom.com> Signed-off-by: Mark Brown <broonie@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-19arm64: Correct virt_addr_validLaura Abbott1-2/+1
The definition of virt_addr_valid is that virt_addr_valid should return true if and only if virt_to_page returns a valid pointer. The current definition of virt_addr_valid only checks against the virtual address range. There's no guarantee that just because a virtual address falls bewteen PAGE_OFFSET and high_memory the associated physical memory has a valid backing struct page. Follow the example of other architectures and convert to pfn_valid to verify that the virtual address is actually valid. Cc: Will Deacon <will.deacon@arm.com> Cc: Nicolas Pitre <nico@linaro.org> Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-16arm64: add CPU power management menu/entriesLorenzo Pieralisi1-0/+6
This patch provides a menu for CPU power management options in the arm64 Kconfig and adds an entry to enable the generic CPU idle configuration. Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: add PM build infrastructureLorenzo Pieralisi2-0/+14
This patch adds the required makefile and kconfig entries to enable PM for arm64 systems. The kernel relies on the cpu_{suspend}/{resume} infrastructure to properly save the context for a CPU and put it to sleep, hence this patch adds the config option required to enable cpu_{suspend}/{resume} API. In order to rely on the CPU PM implementation for saving and restoring of CPU subsystems like GIC and PMU, the arch Kconfig must be also augmented to select the CONFIG_CPU_PM option when SUSPEND or CPU_IDLE kernel implementations are selected. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: add CPU idle callLorenzo Pieralisi1-2/+5
When CPU idle is enabled, the architectural idle call should go through the idle subsystem to allow CPUs to enter idle states defined by the platform CPU idle back-end operations. This patch, mirroring other archs behaviour, adds the CPU idle call to the architectural arch_cpu_idle implementation for arm64. Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: enable generic clockevent broadcastLorenzo Pieralisi3-1/+20
On platforms with power management capabilities, timers that are shut down when a CPU enters deep C-states must be emulated using an always-on timer and a timer IPI to relay the timer IRQ to target CPUs on an SMP system. This patch enables the generic clockevents broadcast infrastructure for arm64, by providing the required Kconfig entries and adding the timer IPI infrastructure. Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: implement HW breakpoints CPU PM notifierLorenzo Pieralisi1-13/+66
When a CPU is shutdown either through CPU idle or suspend to RAM, the content of HW breakpoint registers must be reset or restored to proper values when CPU resume from low power states. This patch adds debug register restore operations to the HW breakpoint control function and implements a CPU PM notifier that allows to restore the content of HW breakpoint registers to allow proper suspend/resume operations. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: refactor code to install/uninstall breakpointsLorenzo Pieralisi1-54/+88
Most of the code executed to install and uninstall breakpoints is common and can be factored out in a function that through a runtime operations type provides the requested implementation. This patch creates a common function that can be used to install/uninstall breakpoints and defines the set of operations that can be carried out through it. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: implement fpsimd CPU PM notifierLorenzo Pieralisi1-0/+36
When a CPU enters a low power state, its FP register content is lost. This patch adds a notifier to save the FP context on CPU shutdown and restore it on CPU resume. The context is saved and restored only if the suspending thread is not a kernel thread, mirroring the current context switch behaviour. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: cpu_{suspend/resume} implementationLorenzo Pieralisi5-0/+319
Kernel subsystems like CPU idle and suspend to RAM require a generic mechanism to suspend a processor, save its context and put it into a quiescent state. The cpu_{suspend}/{resume} implementation provides such a framework through a kernel interface allowing to save/restore registers, flush the context to DRAM and suspend/resume to/from low-power states where processor context may be lost. The CPU suspend implementation relies on the suspend protocol registered in CPU operations to carry out a suspend request after context is saved and flushed to DRAM. The cpu_suspend interface: int cpu_suspend(unsigned long arg); allows to pass an opaque parameter that is handed over to the suspend CPU operations back-end so that it can take action according to the semantics attached to it. The arg parameter allows suspend to RAM and CPU idle drivers to communicate to suspend protocol back-ends; it requires standardization so that the interface can be reused seamlessly across systems, paving the way for generic drivers. Context memory is allocated on the stack, whose address is stashed in a per-cpu variable to keep track of it and passed to core functions that save/restore the registers required by the architecture. Even though, upon successful execution, the cpu_suspend function shuts down the suspending processor, the warm boot resume mechanism, based on the cpu_resume function, makes the resume path operate as a cpu_suspend function return, so that cpu_suspend can be treated as a C function by the caller, which simplifies coding the PM drivers that rely on the cpu_suspend API. Upon context save, the minimal amount of memory is flushed to DRAM so that it can be retrieved when the MMU is off and caches are not searched. The suspend CPU operation, depending on the required operations (eg CPU vs Cluster shutdown) is in charge of flushing the cache hierarchy either implicitly (by calling firmware implementations like PSCI) or explicitly by executing the required cache maintainance functions. Debug exceptions are disabled during cpu_{suspend}/{resume} operations so that debug registers can be saved and restored properly preventing preemption from debug agents enabled in the kernel. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: suspend/resume registers save/restoreLorenzo Pieralisi3-0/+90
Power management software requires the kernel to save and restore CPU registers while going through suspend and resume operations triggered by kernel subsystems like CPU idle and suspend to RAM. This patch implements code that provides save and restore mechanism for the arm v8 implementation. Memory for the context is passed as parameter to both cpu_do_suspend and cpu_do_resume functions, and allows the callers to implement context allocation as they deem fit. The registers that are saved and restored correspond to the registers set actually required by the kernel to be up and running which represents a subset of v8 ISA. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: build MPIDR_EL1 hash function data structureLorenzo Pieralisi2-0/+83
On ARM64 SMP systems, cores are identified by their MPIDR_EL1 register. The MPIDR_EL1 guidelines in the ARM ARM do not provide strict enforcement of MPIDR_EL1 layout, only recommendations that, if followed, split the MPIDR_EL1 on ARM 64 bit platforms in four affinity levels. In multi-cluster systems like big.LITTLE, if the affinity guidelines are followed, the MPIDR_EL1 can not be considered a linear index. This means that the association between logical CPU in the kernel and the HW CPU identifier becomes somewhat more complicated requiring methods like hashing to associate a given MPIDR_EL1 to a CPU logical index, in order for the look-up to be carried out in an efficient and scalable way. This patch provides a function in the kernel that starting from the cpu_logical_map, implement collision-free hashing of MPIDR_EL1 values by checking all significative bits of MPIDR_EL1 affinity level bitfields. The hashing can then be carried out through bits shifting and ORing; the resulting hash algorithm is a collision-free though not minimal hash that can be executed with few assembly instructions. The mpidr_el1 is filtered through a mpidr mask that is built by checking all bits that toggle in the set of MPIDR_EL1s corresponding to possible CPUs. Bits that do not toggle do not carry information so they do not contribute to the resulting hash. Pseudo code: /* check all bits that toggle, so they are required */ for (i = 1, mpidr_el1_mask = 0; i < num_possible_cpus(); i++) mpidr_el1_mask |= (cpu_logical_map(i) ^ cpu_logical_map(0)); /* * Build shifts to be applied to aff0, aff1, aff2, aff3 values to hash the * mpidr_el1 * fls() returns the last bit set in a word, 0 if none * ffs() returns the first bit set in a word, 0 if none */ fs0 = mpidr_el1_mask[7:0] ? ffs(mpidr_el1_mask[7:0]) - 1 : 0; fs1 = mpidr_el1_mask[15:8] ? ffs(mpidr_el1_mask[15:8]) - 1 : 0; fs2 = mpidr_el1_mask[23:16] ? ffs(mpidr_el1_mask[23:16]) - 1 : 0; fs3 = mpidr_el1_mask[39:32] ? ffs(mpidr_el1_mask[39:32]) - 1 : 0; ls0 = fls(mpidr_el1_mask[7:0]); ls1 = fls(mpidr_el1_mask[15:8]); ls2 = fls(mpidr_el1_mask[23:16]); ls3 = fls(mpidr_el1_mask[39:32]); bits0 = ls0 - fs0; bits1 = ls1 - fs1; bits2 = ls2 - fs2; bits3 = ls3 - fs3; aff0_shift = fs0; aff1_shift = 8 + fs1 - bits0; aff2_shift = 16 + fs2 - (bits0 + bits1); aff3_shift = 32 + fs3 - (bits0 + bits1 + bits2); u32 hash(u64 mpidr_el1) { u32 l[4]; u64 mpidr_el1_masked = mpidr_el1 & mpidr_el1_mask; l[0] = mpidr_el1_masked & 0xff; l[1] = mpidr_el1_masked & 0xff00; l[2] = mpidr_el1_masked & 0xff0000; l[3] = mpidr_el1_masked & 0xff00000000; return (l[0] >> aff0_shift | l[1] >> aff1_shift | l[2] >> aff2_shift | l[3] >> aff3_shift); } The hashing algorithm relies on the inherent properties set in the ARM ARM recommendations for the MPIDR_EL1. Exotic configurations, where for instance the MPIDR_EL1 values at a given affinity level have large holes, can end up requiring big hash tables since the compression of values that can be achieved through shifting is somewhat crippled when holes are present. Kernel warns if the number of buckets of the resulting hash table exceeds the number of possible CPUs by a factor of 4, which is a symptom of a very sparse HW MPIDR_EL1 configuration. The hash algorithm is quite simple and can easily be implemented in assembly code, to be used in code paths where the kernel virtual address space is not set-up (ie cpu_resume) and instruction and data fetches are strongly ordered so code must be compact and must carry out few data accesses. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-16arm64: kernel: add MPIDR_EL1 accessors macrosLorenzo Pieralisi1-0/+10
In order to simplify access to different affinity levels within the MPIDR_EL1 register values, this patch implements some preprocessor macros that allow to retrieve the MPIDR_EL1 affinity level value according to the level passed as input parameter. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
2013-12-06arm64: mm: Fix PMD_SECT_PROT_NONE definitionSteve Capper1-1/+1
Modify the value of PMD_SECT_PROT_NONE to match that of PTE_NONE. This should have been in commit 3676f9ef5481 (Move PTE_PROT_NONE higher up). Signed-off-by: Steve Capper <steve.capper@linaro.org> Cc: <stable@vger.kernel.org> # 3.11+: 3676f9ef5481: arm64: Move PTE_PROT_NONE higher up Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-06arm64: Fix memory shareability attribute for ioremap_wc/cacheCatalin Marinas1-1/+1
Write-combine and cacheable mappings use Normal memory on arm64. On SMP systems, the pte needs the shareability bit which is set in pgprot_default. Use this for defining PROT_DEFAULT used by ioremap_wc and ioremap_cache (Device memory is shareable by default, does not need additional attributes). Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-06arm64: kernel: add code to set cpu boot mode to secondary_entry shimLorenzo Pieralisi1-1/+2
The refactoring of el2_setup split code setting up EL2 and detecting the CPU boot mode in separate chunks. This allows the code that sets up EL2 to run in an endian independent way - ie before the endianess is set up in the respective sctlr registers. This patch brings secondary_entry up-to-date so that CPUs entering the kernel through this code path set-up EL2 and the cpu boot mode properly. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Mark Rutland <mark.rutand@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-06arm64: make default NR_CPUS 8Rob Herring1-2/+1
Rather than continue to add per platform defaults, make the default a likely common core count. 8 is also the default for x86. Signed-off-by: Rob Herring <rob.herring@calxeda.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-12-06arm64: ensure completion of TLB invalidatationMark Rutland1-1/+1
Currently there is no dsb between the tlbi in __cpu_setup and the write to SCTLR_EL1 which enables the MMU in __turn_mmu_on. This means that the TLB invalidation is not guaranteed to have completed at the point address translation is enabled, leading to a number of possible issues including incorrect translations and TLB conflict faults. This patch moves the tlbi in __cpu_setup above an existing dsb used to synchronise I-cache invalidation, ensuring that the TLBs have been invalidated at the point the MMU is enabled. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-29arm64: Move PTE_PROT_NONE higher upCatalin Marinas1-14/+17
PTE_PROT_NONE means that a pte is present but does not have any read/write attributes. However, setting the memory type like pgprot_writecombine() is allowed and such bits overlap with PTE_PROT_NONE. This causes mmap/munmap issues in drivers that change the vma->vm_pg_prot on PROT_NONE mappings. This patch reverts the PTE_FILE/PTE_PROT_NONE shift in commit 59911ca4325d (ARM64: mm: Move PTE_PROT_NONE bit) and moves PTE_PROT_NONE together with the other software bits. Signed-off-by: Steve Capper <steve.capper@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Steve Capper <steve.capper@linaro.org> Cc: <stable@vger.kernel.org> # 3.11+
2013-11-29arm64: Use Normal NonCacheable memory for writecombineCatalin Marinas1-1/+1
This provides better performance compared to Device GRE and also allows unaligned accesses. Such memory is intended to be used with standard RAM (e.g. framebuffers) and not I/O. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-28arm64: debug: make aarch32 bkpt checking endian cleanMatthew Leach1-8/+12
The current breakpoint instruction checking code for A32 is not endian clean. Fix this with appropriate byte-swapping when retrieving instructions. Signed-off-by: Matthew Leach <matthew.leach@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-28arm64: ptrace: fix compat registes get/set to be endian cleanMatthew Leach1-21/+19
On a BE system the wrong half of the X registers is retrieved/written when attempting to get/set the value of aarch32 registers through ptrace. Ensure that types are the correct width so that the relevant casting occurs. Signed-off-by: Matthew Leach <matthew.leach@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-25arm64: Unmask asynchronous aborts when in kernel modeCatalin Marinas3-0/+9
The asynchronous aborts are generally fatal for the kernel but they can be masked via the pstate A bit. If a system error happens while in kernel mode, it won't be visible until returning to user space. This patch enables this kind of abort early to help identifying the cause. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-25arm64: dts: Reserve the memory used for secondary CPU release addressCatalin Marinas1-0/+2
With the spin-table SMP booting method, secondary CPUs poll a location passed in the DT. The foundation-v8.dts file doesn't have this memory reserved and there is a risk of Linux using it before secondary CPUs are started. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-25arm64: let the core code deal with preempt_countMarc Zyngier1-22/+7
Commit f27dde8deef3 (sched: Add NEED_RESCHED to the preempt_count) introduced the use of bit 31 in preempt_count for obscure scheduling purposes. This causes interrupts taken from EL0 to hit the (open coded) BUG when this flag is flipped while handling the interrupt (we compare the values before and after, and kill the kernel if they are different). The fix is to stop messing with the preempt count entirely, as this is already being dealt with in the generic code (irq_enter/irq_exit). Tested on a dual A53 FPGA running cyclictest. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-11-19Merge branch 'irq-urgent-for-linus' of ↵Linus Torvalds1-6/+0
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull irq cleanups from Ingo Molnar: "This is a multi-arch cleanup series from Thomas Gleixner, which we kept to near the end of the merge window, to not interfere with architecture updates. This series (motivated by the -rt kernel) unifies more aspects of IRQ handling and generalizes PREEMPT_ACTIVE" * 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: preempt: Make PREEMPT_ACTIVE generic sparc: Use preempt_schedule_irq ia64: Use preempt_schedule_irq m32r: Use preempt_schedule_irq hardirq: Make hardirq bits generic m68k: Simplify low level interrupt handling code genirq: Prevent spurious detection for unconditionally polled interrupts
2013-11-15Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds8-15/+113
Pull KVM changes from Paolo Bonzini: "Here are the 3.13 KVM changes. There was a lot of work on the PPC side: the HV and emulation flavors can now coexist in a single kernel is probably the most interesting change from a user point of view. On the x86 side there are nested virtualization improvements and a few bugfixes. ARM got transparent huge page support, improved overcommit, and support for big endian guests. Finally, there is a new interface to connect KVM with VFIO. This helps with devices that use NoSnoop PCI transactions, letting the driver in the guest execute WBINVD instructions. This includes some nVidia cards on Windows, that fail to start without these patches and the corresponding userspace changes" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (146 commits) kvm, vmx: Fix lazy FPU on nested guest arm/arm64: KVM: PSCI: propagate caller endianness to the incoming vcpu arm/arm64: KVM: MMIO support for BE guest kvm, cpuid: Fix sparse warning kvm: Delete prototype for non-existent function kvm_check_iopl kvm: Delete prototype for non-existent function complete_pio hung_task: add method to reset detector pvclock: detect watchdog reset at pvclock read kvm: optimize out smp_mb after srcu_read_unlock srcu: API for barrier after srcu read unlock KVM: remove vm mmap method KVM: IOMMU: hva align mapping page size KVM: x86: trace cpuid emulation when called from emulator KVM: emulator: cleanup decode_register_operand() a bit KVM: emulator: check rex prefix inside decode_register() KVM: x86: fix emulation of "movzbl %bpl, %eax" kvm_host: typo fix KVM: x86: emulate SAHF instruction MAINTAINERS: add tree for kvm.git Documentation/kvm: add a 00-INDEX file ...
2013-11-15Merge tag 'stable/for-linus-3.13-rc0-tag' of ↵Linus Torvalds5-2/+72
git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip Pull Xen updates from Konrad Rzeszutek Wilk: "This has tons of fixes and two major features which are concentrated around the Xen SWIOTLB library. The short <blurb> is that the tracing facility (just one function) has been added to SWIOTLB to make it easier to track I/O progress. Additionally under Xen and ARM (32 & 64) the Xen-SWIOTLB driver "is used to translate physical to machine and machine to physical addresses of foreign[guest] pages for DMA operations" (Stefano) when booting under hardware without proper IOMMU. There are also bug-fixes, cleanups, compile warning fixes, etc. The commit times for some of the commits is a bit fresh - that is b/c we wanted to make sure we have the Ack's from the ARM folks - which with the string of back-to-back conferences took a bit of time. Rest assured - the code has been stewing in #linux-next for some time. Features: - SWIOTLB has tracing added when doing bounce buffer. - Xen ARM/ARM64 can use Xen-SWIOTLB. This work allows Linux to safely program real devices for DMA operations when running as a guest on Xen on ARM, without IOMMU support. [*1] - xen_raw_printk works with PVHVM guests if needed. Bug-fixes: - Make memory ballooning work under HVM with large MMIO region. - Inform hypervisor of MCFG regions found in ACPI DSDT. - Remove deprecated IRQF_DISABLED. - Remove deprecated __cpuinit. [*1]: "On arm and arm64 all Xen guests, including dom0, run with second stage translation enabled. As a consequence when dom0 programs a device for a DMA operation is going to use (pseudo) physical addresses instead machine addresses. This work introduces two trees to track physical to machine and machine to physical mappings of foreign pages. Local pages are assumed mapped 1:1 (physical address == machine address). It enables the SWIOTLB-Xen driver on ARM and ARM64, so that Linux can translate physical addresses to machine addresses for dma operations when necessary. " (Stefano)" * tag 'stable/for-linus-3.13-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (32 commits) xen/arm: pfn_to_mfn and mfn_to_pfn return the argument if nothing is in the p2m arm,arm64/include/asm/io.h: define struct bio_vec swiotlb-xen: missing include dma-direction.h pci-swiotlb-xen: call pci_request_acs only ifdef CONFIG_PCI arm: make SWIOTLB available xen: delete new instances of added __cpuinit xen/balloon: Set balloon's initial state to number of existing RAM pages xen/mcfg: Call PHYSDEVOP_pci_mmcfg_reserved for MCFG areas. xen: remove deprecated IRQF_DISABLED x86/xen: remove deprecated IRQF_DISABLED swiotlb-xen: fix error code returned by xen_swiotlb_map_sg_attrs swiotlb-xen: static inline xen_phys_to_bus, xen_bus_to_phys, xen_virt_to_bus and range_straddles_page_boundary grant-table: call set_phys_to_machine after mapping grant refs arm,arm64: do not always merge biovec if we are running on Xen swiotlb: print a warning when the swiotlb is full swiotlb-xen: use xen_dma_map/unmap_page, xen_dma_sync_single_for_cpu/device xen: introduce xen_dma_map/unmap_page and xen_dma_sync_single_for_cpu/device tracing/events: Fix swiotlb tracepoint creation swiotlb-xen: use xen_alloc/free_coherent_pages xen: introduce xen_alloc/free_coherent_pages ...
2013-11-15kernel: remove CONFIG_USE_GENERIC_SMP_HELPERSChristoph Hellwig1-1/+0
We've switched over every architecture that supports SMP to it, so remove the new useless config variable. Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-15arm64: handle pgtable_page_ctor() failKirill A. Shutemov1-3/+6
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-11-14Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-armLinus Torvalds4-34/+19
Pull ARM updates from Russell King: "Included in this series are: 1. BE8 (modern big endian) changes for ARM from Ben Dooks 2. big.Little support from Nicolas Pitre and Dave Martin 3. support for LPAE systems with all system memory above 4GB 4. Perf updates from Will Deacon 5. Additional prefetching and other performance improvements from Will. 6. Neon-optimised AES implementation fro Ard. 7. A number of smaller fixes scattered around the place. There is a rather horrid merge conflict in tools/perf - I was never notified of the conflict because it originally occurred between Will's tree and other stuff. Consequently I have a resolution which Will forwarded me, which I'll forward on immediately after sending this mail. The other notable thing is I'm expecting some build breakage in the crypto stuff on ARM only with Ard's AES patches. These were merged into a stable git branch which others had already pulled, so there's little I can do about this. The problem is caused because these patches have a dependency on some code in the crypto git tree - I tried requesting a branch I can pull to resolve these, and all I got each time from the crypto people was "we'll revert our patches then" which would only make things worse since I still don't have the dependent patches. I've no idea what's going on there or how to resolve that, and since I can't split these patches from the rest of this pull request, I'm rather stuck with pushing this as-is or reverting Ard's patches. Since it should "come out in the wash" I've left them in - the only build problems they seem to cause at the moment are with randconfigs, and since it's a new feature anyway. However, if by -rc1 the dependencies aren't in, I think it'd be best to revert Ard's patches" I resolved the perf conflict roughly as per the patch sent by Russell, but there may be some differences. Any errors are likely mine. Let's see how the crypto issues work out.. * 'for-linus' of git://git.linaro.org/people/rmk/linux-arm: (110 commits) ARM: 7868/1: arm/arm64: remove atomic_clear_mask() in "include/asm/atomic.h" ARM: 7867/1: include: asm: use 'int' instead of 'unsigned long' for 'oldval' in atomic_cmpxchg(). ARM: 7866/1: include: asm: use 'long long' instead of 'u64' within atomic.h ARM: 7871/1: amba: Extend number of IRQS ARM: 7887/1: Don't smp_cross_call() on UP devices in arch_irq_work_raise() ARM: 7872/1: Support arch_irq_work_raise() via self IPIs ARM: 7880/1: Clear the IT state independent of the Thumb-2 mode ARM: 7878/1: nommu: Implement dummy early_paging_init() ARM: 7876/1: clear Thumb-2 IT state on exception handling ARM: 7874/2: bL_switcher: Remove cpu_hotplug_driver_{lock,unlock}() ARM: footbridge: fix build warnings for netwinder ARM: 7873/1: vfp: clear vfp_current_hw_state for dying cpu ARM: fix misplaced arch_virt_to_idmap() ARM: 7848/1: mcpm: Implement cpu_kill() to synchronise on powerdown ARM: 7847/1: mcpm: Factor out logical-to-physical CPU translation ARM: 7869/1: remove unused XSCALE_PMU Kconfig param ARM: 7864/1: Handle 64-bit memory in case of 32-bit phys_addr_t ARM: 7863/1: Let arm_add_memory() always use 64-bit arguments ARM: 7862/1: pcpu: replace __get_cpu_var_uses ARM: 7861/1: cacheflush: consolidate single-CPU ARMv7 cache disabling code ...