| Commit message (Collapse) | Author | Age |
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Use the generic PCI domain and OF functions to provide support for PCI
on arm64.
[bhelgaas: Change comments to use generic PCI, not just PCIe. Nothing at
this level is PCIe-specific.]
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq updates from Thomas Gleixner:
"The irq departement delivers:
- a cleanup series to get rid of mindlessly copied code.
- another bunch of new pointlessly different interrupt chip drivers.
Adding homebrewn irq chips (and timers) to SoCs must provide a
value add which is beyond the imagination of mere mortals.
- the usual SoC irq controller updates, IOW my second cat herding
project"
* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (44 commits)
irqchip: gic-v3: Implement CPU PM notifier
irqchip: gic-v3: Refactor gic_enable_redist to support both enabling and disabling
irqchip: renesas-intc-irqpin: Add minimal runtime PM support
irqchip: renesas-intc-irqpin: Add helper variable dev = &pdev->dev
irqchip: atmel-aic5: Add sama5d4 support
irqchip: atmel-aic5: The sama5d3 has 48 IRQs
Documentation: bcm7120-l2: Add Broadcom BCM7120-style L2 binding
irqchip: bcm7120-l2: Add Broadcom BCM7120-style Level 2 interrupt controller
irqchip: renesas-irqc: Add binding docs for new R-Car Gen2 SoCs
irqchip: renesas-irqc: Add DT binding documentation
irqchip: renesas-intc-irqpin: Document SoC-specific bindings
openrisc: Get rid of handle_IRQ
arm64: Get rid of handle_IRQ
ARM: omap2: irq: Convert to handle_domain_irq
ARM: imx: tzic: Convert to handle_domain_irq
ARM: imx: avic: Convert to handle_domain_irq
irqchip: or1k-pic: Convert to handle_domain_irq
irqchip: atmel-aic5: Convert to handle_domain_irq
irqchip: atmel-aic: Convert to handle_domain_irq
irqchip: gic-v3: Convert to handle_domain_irq
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All the arm64 irqchip drivers have been converted to handle_domain_irq,
making it possible to remove the handle_IRQ stub entierely.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lkml.kernel.org/r/1409047421-27649-26-git-send-email-marc.zyngier@arm.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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In order to limit code duplication, convert the architecture specific
handle_IRQ to use the generic __handle_domain_irq function.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lkml.kernel.org/r/1409047421-27649-3-git-send-email-marc.zyngier@arm.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer updates from Thomas Gleixner:
"Nothing really exciting this time:
- a few fixlets in the NOHZ code
- a new ARM SoC timer abomination. One should expect that we have
enough of them already, but they insist on inventing new ones.
- the usual bunch of ARM SoC timer updates. That feels like herding
cats"
* 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
clocksource: arm_arch_timer: Consolidate arch_timer_evtstrm_enable
clocksource: arm_arch_timer: Enable counter access for 32-bit ARM
clocksource: arm_arch_timer: Change clocksource name if CP15 unavailable
clocksource: sirf: Disable counter before re-setting it
clocksource: cadence_ttc: Add support for 32bit mode
clocksource: tcb_clksrc: Sanitize IRQ request
clocksource: arm_arch_timer: Discard unavailable timers correctly
clocksource: vf_pit_timer: Support shutdown mode
ARM: meson6: clocksource: Add Meson6 timer support
ARM: meson: documentation: Add timer documentation
clocksource: sh_tmu: Document r8a7779 binding
clocksource: sh_mtu2: Document r7s72100 binding
clocksource: sh_cmt: Document SoC specific bindings
timerfd: Remove an always true check
nohz: Avoid tick's double reprogramming in highres mode
nohz: Fix spurious periodic tick behaviour in low-res dynticks mode
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The arch_timer_evtstrm_enable hooks in arm and arm64 are substantially
similar, the only difference being a CONFIG_COMPAT-conditional section
which is relevant only for arm64. Copy the arm64 version to the
driver, removing the arch-specific hooks.
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
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The only difference between arm and arm64's implementations of
arch_counter_set_user_access is that 32-bit ARM does not enable user
access to the virtual counter. We want to enable this access for the
32-bit ARM VDSO, so copy the arm64 version to the driver itself, and
remove the arch-specific implementations.
Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fixes from Ingo Molnar:
"Main changes:
- Fix the deadlock reported by Dave Jones et al
- Clean up and fix nohz_full interaction with arch abilities
- nohz init code consolidation/cleanup"
* 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
nohz: nohz full depends on irq work self IPI support
nohz: Consolidate nohz full init code
arm64: Tell irq work about self IPI support
arm: Tell irq work about self IPI support
x86: Tell irq work about self IPI support
irq_work: Force raised irq work to run on irq work interrupt
irq_work: Introduce arch_irq_work_has_interrupt()
nohz: Move nohz full init call to tick init
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ARM64 irq work self-IPI support depends on __smp_cross_call to point to
some relevant IRQ controller operations. This information should be
available after the call to init_IRQ().
Lets implement arch_irq_work_has_interrupt() accordingly.
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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The nohz full code needs irq work to trigger its own interrupt so that
the subsystem can work even when the tick is stopped.
Lets introduce arch_irq_work_has_interrupt() that archs can override to
tell about their support for this ability.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM64 SoC changes from Arnd Bergmann:
"Starting with 3.18, we are merging SoC-specific changes for arm64
through the arm-soc tree, like we have been doing for arm32.
This time, there is only one set of changes, adding support for the
Cavium "Thunder" Soc family. Since the changes are relatively small,
this includes Kconfig, defconfig and DT changes.
If all goes well, we will never require adding actual C source code
for platform support in arm64, given that the architecture is more
clearly defined and we have moved out a lot of the platform specifics
into device drivers for arm32 already"
* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
arm64, defconfig: Enable Cavium Thunder SoC in defconfig
arm64, thunder: Add Kconfig option for Cavium Thunder SoC Family
arm64, thunder: Document devicetree bindings for Cavium Thunder SoC
arm64, thunder: Add initial dts for Cavium Thunder SoC
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This patch enables Thunder SoCs in the arm64 defconfig. This is
esp. useful to add Thunder platforms to automated builds based on
arm64 defconfig.
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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This introduces ARCH_THUNDER to enable soc specific drivers and dtb
files.
Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Add initial device tree nodes for Cavium Thunder SoCs with support of
48 cores and gicv3. The dtsi file requires further changes, esp. for
pci, gicv3-its and smmu. This changes will be added later together
with the device drivers.
Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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Pull crypto update from Herbert Xu:
- add multibuffer infrastructure (single_task_running scheduler helper,
OKed by Peter on lkml.
- add SHA1 multibuffer implementation for AVX2.
- reenable "by8" AVX CTR optimisation after fixing counter overflow.
- add APM X-Gene SoC RNG support.
- SHA256/SHA512 now handles unaligned input correctly.
- set lz4 decompressed length correctly.
- fix algif socket buffer allocation failure for 64K page machines.
- misc fixes
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (47 commits)
crypto: sha - Handle unaligned input data in generic sha256 and sha512.
Revert "crypto: aesni - disable "by8" AVX CTR optimization"
crypto: aesni - remove unused defines in "by8" variant
crypto: aesni - fix counter overflow handling in "by8" variant
hwrng: printk replacement
crypto: qat - Removed unneeded partial state
crypto: qat - Fix typo in name of tasklet_struct
crypto: caam - Dynamic allocation of addresses for various memory blocks in CAAM.
crypto: mcryptd - Fix typos in CRYPTO_MCRYPTD description
crypto: algif - avoid excessive use of socket buffer in skcipher
arm64: dts: add random number generator dts node to APM X-Gene platform.
Documentation: rng: Add X-Gene SoC RNG driver documentation
hwrng: xgene - add support for APM X-Gene SoC RNG support
crypto: mv_cesa - Add missing #define
crypto: testmgr - add test for lz4 and lz4hc
crypto: lz4,lz4hc - fix decompression
crypto: qat - Use pci_enable_msix_exact() instead of pci_enable_msix()
crypto: drbg - fix maximum value checks on 32 bit systems
crypto: drbg - fix sparse warning for cpu_to_be[32|64]
crypto: sha-mb - sha1_mb_alg_state can be static
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This adds random number generator dts node to APM X-Gene platform.
Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 updates from Catalin Marinas:
- eBPF JIT compiler for arm64
- CPU suspend backend for PSCI (firmware interface) with standard idle
states defined in DT (generic idle driver to be merged via a
different tree)
- Support for CONFIG_DEBUG_SET_MODULE_RONX
- Support for unmapped cpu-release-addr (outside kernel linear mapping)
- set_arch_dma_coherent_ops() implemented and bus notifiers removed
- EFI_STUB improvements when base of DRAM is occupied
- Typos in KGDB macros
- Clean-up to (partially) allow kernel building with LLVM
- Other clean-ups (extern keyword, phys_addr_t usage)
* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (51 commits)
arm64: Remove unneeded extern keyword
ARM64: make of_device_ids const
arm64: Use phys_addr_t type for physical address
aarch64: filter $x from kallsyms
arm64: Use DMA_ERROR_CODE to denote failed allocation
arm64: Fix typos in KGDB macros
arm64: insn: Add return statements after BUG_ON()
arm64: debug: don't re-enable debug exceptions on return from el1_dbg
Revert "arm64: dmi: Add SMBIOS/DMI support"
arm64: Implement set_arch_dma_coherent_ops() to replace bus notifiers
of: amba: use of_dma_configure for AMBA devices
arm64: dmi: Add SMBIOS/DMI support
arm64: Correct ftrace calls to aarch64_insn_gen_branch_imm()
arm64:mm: initialize max_mapnr using function set_max_mapnr
setup: Move unmask of async interrupts after possible earlycon setup
arm64: LLVMLinux: Fix inline arm64 assembly for use with clang
arm64: pageattr: Correctly adjust unaligned start addresses
net: bpf: arm64: fix module memory leak when JIT image build fails
arm64: add PSCI CPU_SUSPEND based cpu_suspend support
arm64: kernel: introduce cpu_init_idle CPU operation
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Function prototypes are never definitions, so remove any 'extern' keyword
from the funcion prototypes in cpu_ops.h. Fixes warnings emited by
checkpatch.
Signed-off-by: Geoff Levand <geoff@infradead.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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of_device_ids (i.e. compatible strings and the respective data) are not
supposed to change at runtime. All functions working with of_device_ids
provided by <linux/of.h> work with const of_device_ids. So mark the
only non-const struct in arch/arm64 as const, too.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Change the type of physical address from unsigned long to phys_addr_t,
make valid_phys_addr_range more readable.
Signed-off-by: Min-Hua Chen <orca.chen@gmail.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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This patch replaces the static assignment of ~0 to dma_handle with
DMA_ERROR_CODE to be consistent with other platforms.
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Some of the KGDB macros used for generating the BRK instructions had the
wrong spelling for DBG and KGDB abbreviations.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Following a recent series of enhancements to the insn code the ARMv8
allnoconfig build has been generating a large number of warnings in the
form of:
arch/arm64/kernel/insn.c:689:8: warning: 'insn' may be used uninitialized in this function [-Wmaybe-uninitialized]
This is because BUG() and related macros can be compiled out so we get
execution paths which normally result in a panic compiling out to noops
instead.
I wasn't able to immediately identify a sensible return value to use in
these cases so just return AARCH64_BREAK_FAULT - this is all "should
never happen" code so hopefully it never has a practical impact.
Signed-off-by: Mark Brown <broonie@kernel.org>
[catalin.marinas@arm.com: AARCH64_BREAK_FAULT definition contributed by Daniel Borkmann]
[catalin.marinas@arm.com: replace return 0 with AARCH64_BREAK_FAULT]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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When returning from a debug exception taken from EL1, we unmask debug
exceptions after handling the exception. This is crucial for debug
exceptions taken from EL0, so that any kernel work on the ret_to_user
path can be debugged by kgdb.
However, when returning back to EL1 the only thing left to do is to
restore the original register state before the exception return. If
single-step has been enabled by the debug exception handler, we will
get stuck in an infinite debug exception loop, since we will take the
step exception as soon as we unmask debug exceptions.
This patch avoids unmasking debug exceptions on the debug exception
return path when the exception was taken from EL1.
Fixes: 2a2830703a23 (arm64: debug: avoid accessing mdscr_el1 on fault paths where possible)
Cc: <stable@vger.kernel.org> #3.16+
Reported-by: David Long <dave.long@linaro.org>
Reported-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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This reverts commit 668ebd106860f09f43993517f786a2ddfd0f9ebe.
... because of lots of warnings during boot if Linux isn't started as an EFI
application:
WARNING: CPU: 4 PID: 1 at
/work/Linux/linux-2.6-aarch64/drivers/firmware/dmi_scan.c:591 dmi_matches+0x10c/0x110()
dmi check: not initialized yet.
Modules linked in:
CPU: 4 PID: 1 Comm: swapper/0 Not tainted 3.17.0-rc4+ #606
Call trace:
[<ffffffc000087fb0>] dump_backtrace+0x0/0x124
[<ffffffc0000880e4>] show_stack+0x10/0x1c
[<ffffffc0004d58f8>] dump_stack+0x74/0xb8
[<ffffffc0000ab640>] warn_slowpath_common+0x8c/0xb4
[<ffffffc0000ab6b4>] warn_slowpath_fmt+0x4c/0x58
[<ffffffc0003f2d7c>] dmi_matches+0x108/0x110
[<ffffffc0003f2da8>] dmi_check_system+0x24/0x68
[<ffffffc0006974c4>] atkbd_init+0x10/0x34
[<ffffffc0000814ac>] do_one_initcall+0x88/0x1a0
[<ffffffc00067aab4>] kernel_init_freeable+0x148/0x1e8
[<ffffffc0004d2c64>] kernel_init+0x10/0xd4
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Commit 6ecba8eb51b7 (arm64: Use bus notifiers to set per-device coherent
DMA ops) introduced bus notifiers to set the coherent dma ops based on
the 'dma-coherent' DT property. Since the generic of_dma_configure()
handles this property for platform and AMBA devices, replace the
notifiers with set_arch_dma_coherent_ops().
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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SMBIOS is important for server hardware vendors. It implements a spec for
providing descriptive information about the platform. Things like serial
numbers, physical layout of the ports, build configuration data, and the like.
This has been tested by dmidecode and lshw tools.
This patch adds the call to dmi_scan_machine() to arm64_enter_virtual_mode(),
as that is the point where the EFI Configuration Tables are registered as
being available. It needs to be in an early_initcall anyway as dmi_id_init(),
which is an arch_initcall itself, depends on dmi_scan_machine() having been
called already.
Signed-off-by: Yi Li <yi.li@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The aarch64_insn_gen_branch_imm() function takes an enum as the last
argument rather than a bool. It happens to work because
AARCH64_INSN_BRANCH_LINK matches 'true' but better to use the actual
type.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Initializing max_mapnr using set_max_mapnr() helper function instead
of direct reference. Also not adding PHYS_PFN_OFFSET to max_pfn,
since it already contains it.
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@caviumnetworks.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The kernel wants to enable reporting of asynchronous interrupts (i.e.
System Errors) as early as possible. But if this happens too early then
any pending System Error on initial entry into the kernel may never be
reported where a user can see it. This situation will occur if the kernel
is configured with CONFIG_PANIC_ON_OOPS set and (default or command line)
enabled, in which case the kernel will panic as intended, however the
associated logging messages indicating this failure condition will remain
only in the kernel ring buffer and never be flushed out to the (not yet
configured) console. Therefore, this patch moves the enabling of
asynchronous interrupts during early setup to as early as reasonable,
but after parsing any possible earlycon parameters setting up earlycon.
Signed-off-by: Jon Masters <jcm@redhat.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Remove '#' from immediate parameter in AARCH64 inline assembly in mmu.
This code now works with both gcc and clang.
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The start address needs to be actually updated after it
is detected to be unaligned. Adjust it and the end address
properly.
Reported-by: Zi Shen Lim <zlim.lnx@gmail.com>
Reviewed-by: Zi Shen Lim <zlim.lnx@gmail.com>
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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On ARM64, when the BPF JIT compiler fills the JIT image body with
opcodes during translation of eBPF into ARM64 opcodes, we may fail
for several reasons during that phase: one being that we jump to
the notyet label for not yet supported eBPF instructions such as
BPF_ST. In that case we only free offsets, but not the actual
allocated target image where opcodes are being stored. Fix it by
calling module_free() on dismantle time in case of errors.
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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* cpuidle:
arm64: add PSCI CPU_SUSPEND based cpu_suspend support
arm64: kernel: introduce cpu_init_idle CPU operation
arm64: kernel: refactor the CPU suspend API for retention states
Documentation: arm: define DT idle states bindings
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This patch implements the cpu_suspend cpu operations method through
the PSCI CPU SUSPEND API. The PSCI implementation translates the idle state
index passed by the cpu_suspend core call into a valid PSCI state according to
the PSCI states initialized at boot through the cpu_init_idle() CPU
operations hook.
The PSCI CPU suspend operation hook checks if the PSCI state is a
standby state. If it is, it calls the PSCI suspend implementation
straight away, without saving any context. If the state is a power
down state the kernel calls the __cpu_suspend API (that saves the CPU
context) and passed the PSCI suspend finisher as a parameter so that PSCI
can be called by the __cpu_suspend implementation after saving and flushing
the context as last function before power down.
For power down states, entry point is set to cpu_resume physical address,
that represents the default kernel execution address following a CPU reset.
Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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The CPUidle subsystem on ARM64 machines requires the idle states
implementation back-end to initialize idle states parameter upon
boot. This patch adds a hook in the CPU operations structure that
should be initialized by the CPU operations back-end in order to
provide a function that initializes cpu idle states.
This patch also adds the infrastructure to arm64 kernel required
to export the CPU operations based initialization interface, so
that drivers (ie CPUidle) can use it when they are initialized
at probe time.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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CPU suspend is the standard kernel interface to be used to enter
low-power states on ARM64 systems. Current cpu_suspend implementation
by default assumes that all low power states are losing the CPU context,
so the CPU registers must be saved and cleaned to DRAM upon state
entry. Furthermore, the current cpu_suspend() implementation assumes
that if the CPU suspend back-end method returns when called, this has
to be considered an error regardless of the return code (which can be
successful) since the CPU was not expected to return from a code path that
is different from cpu_resume code path - eg returning from the reset vector.
All in all this means that the current API does not cope well with low-power
states that preserve the CPU context when entered (ie retention states),
since first of all the context is saved for nothing on state entry for
those states and a successful state entry can return as a normal function
return, which is considered an error by the current CPU suspend
implementation.
This patch refactors the cpu_suspend() API so that it can be split in
two separate functionalities. The arm64 cpu_suspend API just provides
a wrapper around CPU suspend operation hook. A new function is
introduced (for architecture code use only) for states that require
context saving upon entry:
__cpu_suspend(unsigned long arg, int (*fn)(unsigned long))
__cpu_suspend() saves the context on function entry and calls the
so called suspend finisher (ie fn) to complete the suspend operation.
The finisher is not expected to return, unless it fails in which case
the error is propagated back to the __cpu_suspend caller.
The API refactoring results in the following pseudo code call sequence for a
suspending CPU, when triggered from a kernel subsystem:
/*
* int cpu_suspend(unsigned long idx)
* @idx: idle state index
*/
{
-> cpu_suspend(idx)
|---> CPU operations suspend hook called, if present
|--> if (retention_state)
|--> direct suspend back-end call (eg PSCI suspend)
else
|--> __cpu_suspend(idx, &back_end_finisher);
}
By refactoring the cpu_suspend API this way, the CPU operations back-end
has a chance to detect whether idle states require state saving or not
and can call the required suspend operations accordingly either through
simple function call or indirectly through __cpu_suspend() which carries out
state saving and suspend finisher dispatching to complete idle state entry.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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Raising the current maximum limit to 64. This is needed for Cavium's
Thunder systems that will have at least 48 cores per die.
The change keeps the current memory footprint in cpu mask structures.
It does not break existing code. Setting the maximum to 64 cpus still
boots systems with less cpus.
Mark's Juno happily booted with a NR_CPUS=64 kernel.
Tested on our Thunder system with 48 cores. We could see interrupts to
all cores.
Cc: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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The JIT compiler emits A64 instructions. It supports eBPF only.
Legacy BPF is supported thanks to conversion by BPF core.
JIT is enabled in the same way as for other architectures:
echo 1 > /proc/sys/net/core/bpf_jit_enable
Or for additional compiler output:
echo 2 > /proc/sys/net/core/bpf_jit_enable
See Documentation/networking/filter.txt for more information.
The implementation passes all 57 tests in lib/test_bpf.c
on ARMv8 Foundation Model :) Also tested by Will on Juno platform.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate logical (shifted register)
instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate data-processing (3 source) instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate data-processing (2 source) instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate data-processing (1 source) instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate add/subtract (shifted register)
instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate move wide (immediate) instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate bitfield instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate add/subtract (immediate) instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate load/store pair instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate load/store (register offset)
instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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Introduce function to generate conditional branch (immediate)
instructions.
Signed-off-by: Zi Shen Lim <zlim.lnx@gmail.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
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