Both dump_stack() and show_stack() are currently implemented by each
architecture. show_stack(NULL, NULL) dumps the backtrace for the
current task as does dump_stack(). On some archs, dump_stack() prints
extra information - pid, utsname and so on - in addition to the
backtrace while the two are identical on other archs.
The usages in arch-independent code of the two functions indicate
show_stack(NULL, NULL) should print out bare backtrace while
dump_stack() is used for debugging purposes when something went wrong,
so it does make sense to print additional information on the task which
triggered dump_stack().
There's no reason to require archs to implement two separate but mostly
identical functions. It leads to unnecessary subtle information.
This patch expands the dummy fallback dump_stack() implementation in
lib/dump_stack.c such that it prints out debug information (taken from
x86) and invokes show_stack(NULL, NULL) and drops arch-specific
dump_stack() implementations in all archs except blackfin. Blackfin's
dump_stack() does something wonky that I don't understand.
Debug information can be printed separately by calling
dump_stack_print_info() so that arch-specific dump_stack()
implementation can still emit the same debug information. This is used
in blackfin.
This patch brings the following behavior changes.
* On some archs, an extra level in backtrace for show_stack() could be
printed. This is because the top frame was determined in
dump_stack() on those archs while generic dump_stack() can't do that
reliably. It can be compensated by inlining dump_stack() but not
sure whether that'd be necessary.
* Most archs didn't use to print debug info on dump_stack(). They do
now.
An example WARN dump follows.
WARNING: at kernel/workqueue.c:4841 init_workqueues+0x35/0x505()
Hardware name: empty
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.9.0-rc1-work+ #9
0000000000000009 ffff88007c861e08 ffffffff81c614dc ffff88007c861e48
ffffffff8108f50f ffffffff82228240 0000000000000040 ffffffff8234a03c
0000000000000000 0000000000000000 0000000000000000 ffff88007c861e58
Call Trace:
[<ffffffff81c614dc>] dump_stack+0x19/0x1b
[<ffffffff8108f50f>] warn_slowpath_common+0x7f/0xc0
[<ffffffff8108f56a>] warn_slowpath_null+0x1a/0x20
[<ffffffff8234a071>] init_workqueues+0x35/0x505
...
v2: CPU number added to the generic debug info as requested by s390
folks and dropped the s390 specific dump_stack(). This loses %ksp
from the debug message which the maintainers think isn't important
enough to keep the s390-specific dump_stack() implementation.
dump_stack_print_info() is moved to kernel/printk.c from
lib/dump_stack.c. Because linkage is per objecct file,
dump_stack_print_info() living in the same lib file as generic
dump_stack() means that archs which implement custom dump_stack()
- at this point, only blackfin - can't use dump_stack_print_info()
as that will bring in the generic version of dump_stack() too. v1
The v1 patch broke build on blackfin due to this issue. The build
breakage was reported by Fengguang Wu.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> [s390 bits]
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Fengguang Wu <fengguang.wu@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon bits]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
- Versatile Express SoC (model) support - DT files and Kconfig entries
(there are no arch/arm64/mach-* directories). The bulk of the code has
already been moved to drivers/ as part of the ARM SoC clean-up.
- Basic multi-cluster support (CPU logical map initialised from the DT).
- Simple earlyprintk support for UART 8250/16550 and FastModel console
output.
- Optimised kernel library bitops and string functions.
- Automatic initialisation of the irqchip and clocks via DT.
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Merge tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64
Pull arm64 update from Catalin Marinas:
"Main features:
- Versatile Express SoC (model) support - DT files and Kconfig
entries (there are no arch/arm64/mach-* directories). The bulk of
the code has already been moved to drivers/ as part of the ARM SoC
clean-up.
- Basic multi-cluster support (CPU logical map initialised from the
DT)
- Simple earlyprintk support for UART 8250/16550 and FastModel
console output
- Optimised kernel library bitops and string functions.
- Automatic initialisation of the irqchip and clocks via DT"
* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (26 commits)
arm64: Use acquire/release semantics instead of explicit DMB
arm64: klib: bitops: fix unpredictable stxr usage
arm64: vexpress: Enable ARMv8 RTSM model (SoC) support
arm64: vexpress: Add dts files for the ARMv8 RTSM models
arm64: Survive invalid cpu enable-methods
arm64: mm: Correct show_pte behaviour
arm64: Fix compat types affecting struct compat_stat
arm64: Execute DSB during thread switching for TLB/cache maintenance
arm64: compiling issue, need add include/asm/vga.h file
arm64: smp: honour #address-size when parsing CPU reg property
arm64: Define cmpxchg64 and cmpxchg64_local for outside use
arm64: Define readq and writeq for driver module using
arm64: Fix task tracing
arm64: add explicit symbols to ESR_EL1 decoding
arm64: Use irqchip_init() for interrupt controller initialisation
arm64: psci: Use the MPIDR values from cpu_logical_map for cpu ids.
arm64: klib: Optimised atomic bitops
arm64: klib: Optimised string functions
arm64: klib: Optimised memory functions
arm64: head: match all affinity levels in the pen of the secondaries
...
This patch changes the test_and_*_bit functions to use the
load-acquire/store-release instructions instead of explicit DMB.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
We're currently relying on unpredictable behaviour in our testops
(test_and_*_bit), as stxr is unpredictable when the status register and
the source register are the same
This patch changes reallocates the status register so as to bring us back into
the realm of predictable behaviour. Boot tested on an AEMv8 model.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Pull SMP/hotplug changes from Ingo Molnar:
"This is a pretty large, multi-arch series unifying and generalizing
the various disjunct pieces of idle routines that architectures have
historically copied from each other and have grown in random, wildly
inconsistent and sometimes buggy directions:
101 files changed, 455 insertions(+), 1328 deletions(-)
this went through a number of review and test iterations before it was
committed, it was tested on various architectures, was exposed to
linux-next for quite some time - nevertheless it might cause problems
on architectures that don't read the mailing lists and don't regularly
test linux-next.
This cat herding excercise was motivated by the -rt kernel, and was
brought to you by Thomas "the Whip" Gleixner."
* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
idle: Remove GENERIC_IDLE_LOOP config switch
um: Use generic idle loop
ia64: Make sure interrupts enabled when we "safe_halt()"
sparc: Use generic idle loop
idle: Remove unused ARCH_HAS_DEFAULT_IDLE
bfin: Fix typo in arch_cpu_idle()
xtensa: Use generic idle loop
x86: Use generic idle loop
unicore: Use generic idle loop
tile: Use generic idle loop
tile: Enter idle with preemption disabled
sh: Use generic idle loop
score: Use generic idle loop
s390: Use generic idle loop
powerpc: Use generic idle loop
parisc: Use generic idle loop
openrisc: Use generic idle loop
mn10300: Use generic idle loop
mips: Use generic idle loop
microblaze: Use generic idle loop
...
The sparse code, when asking the architecture to populate the vmemmap,
specifies the section range as a starting page and a number of pages.
This is an awkward interface, because none of the arch-specific code
actually thinks of the range in terms of 'struct page' units and always
translates it to bytes first.
In addition, later patches mix huge page and regular page backing for
the vmemmap. For this, they need to call vmemmap_populate_basepages()
on sub-section ranges with PAGE_SIZE and PMD_SIZE in mind. But these
are not necessarily multiples of the 'struct page' size and so this unit
is too coarse.
Just translate the section range into bytes once in the generic sparse
code, then pass byte ranges down the stack.
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Bernhard Schmidt <Bernhard.Schmidt@lrz.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Tested-by: David S. Miller <davem@davemloft.net>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Use common help functions to free reserved pages.
Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Cc: Russell King <linux@arm.linux.org.uk>
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>
This patch adds the necessary Kconfig entries to enable support for the
ARMv8 software model (Versatile Express platform) together with the
defconfig update.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This patch adds the DTS files for the ARMv8 RTSM and Foundation models.
Signed-off-by: Pawel Moll <Pawel.Moll@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Currently, if you pass the kernel a dtb where a cpu node has an
unsupported enable-method property (e.g. "not-psci"), it'll explode
horribly, as it iterates over the enable_ops array incorrectly. It
increments the pointer *at* the current element, rather than
incrementing the pointer *to* the current element. As the first two
elements pointed to structures that were contiguous in memory, this
happened to be equivalent. However the third element is NULL, so when
the list is exhausted, smp_get_enable_ops generates the wrong pointer,
and dereferences an arbitrary portion of memory, which currently happens
to contain zero.
This patch fixes this by indirecting the pointer one level, so we
iterate over the array elements correctly, avoiding the below panic:
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
show_pte makes use of the *_none_or_clear_bad style functions. If a
pgd, pud or pmd is identified as being bad, it will then be cleared.
As show_pte appears to be called from either the user or kernel
fault handlers this side effect can lead to unpredictable behaviour;
especially as TLB entries are not invalidated.
This patch removes the page table sanitisation from show_pte. If a
bad pgd, pud or pmd is encountered it is left unmodified.
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The compat_stat structure doesn't match the arch/arm/ struct stat
definition. This patch fixes the compat types and struct compat_stat
definition accordingly.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
The DSB following TLB or cache maintenance ops must be run on the same
CPU. With kernel preemption enabled or for user-space cache maintenance
this may not be the case. This patch adds an explicit DSB in the
__switch_to() function.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
For compiling with allmodconfig, need vga.h file, so generate it which
just only include the asm-generic one.
It is firstly used by drivers/gpu/drm/drm_irq.c.
The related error:
include/video/vga.h:22:21: fatal error: asm/vga.h: No such file or directory
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
For systems where the top 32-bits of the MPIDR are all zero, we should
allow the device-tree to specify an #address-size of 0x1 for the CPU reg
property and then zero extend the value there.
Without this patch, kvmtool breaks with the recent mpidr parsing code
introduced in 4c7aa00213 ("arm64: kernel: initialise cpu_logical_map
from the DT").
Acked-by: Javi Merino <javi.merino@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Drivers use cmpxchg64, cmpxchg64_local to perform 64-bit operation, so
they can cross 32-bit and 64-bit platforms (it is a standard way).
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
when compiling with allmodconfig, CONFIG_64BIT=y the file
drivers/base/regmap/regmap-mmio.c will use readq and writeq so we need
implement these functions.
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
the following changes:
- Add sched_clock selection logic to select the highest frequency clock
- Use full 64-bit arch timer counter for sched_clock
- Convert arch timer, sp804 and integrator-cp timers to CLKSRC_OF and
adapt all users to use clocksource_of_init
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Merge tag 'clksrc-cleanup-for-3.10-part2' of git://sources.calxeda.com/kernel/linux into late/clksrc
This is the 2nd part of ARM timer clean-ups for 3.10. This series has
the following changes:
- Add sched_clock selection logic to select the highest frequency clock
- Use full 64-bit arch timer counter for sched_clock
- Convert arch timer, sp804 and integrator-cp timers to CLKSRC_OF and
adapt all users to use clocksource_of_init
* tag 'clksrc-cleanup-for-3.10-part2' of git://sources.calxeda.com/kernel/linux:
devtree: add binding documentation for sp804
ARM: integrator-cp: convert use CLKSRC_OF for timer init
ARM: versatile: use OF init for sp804 timer
ARM: versatile: add versatile dtbs to dtbs target
ARM: vexpress: remove extra timer-sp control register clearing
ARM: dts: vexpress: disable CA9 core tile sp804 timer
ARM: vexpress: remove sp804 OF init
ARM: highbank: use OF init for sp804 timer
ARM: timer-sp: convert to use CLKSRC_OF init
OF: add empty of_device_is_available for !OF
ARM: convert arm/arm64 arch timer to use CLKSRC_OF init
ARM: make machine_desc->init_time default to clocksource_of_init
ARM: arch_timer: use full 64-bit counter for sched_clock
ARM: make sched_clock just call a function pointer
ARM: sched_clock: allow changing to higher frequency counter
Signed-off-by: Olof Johansson <olof@lixom.net>
This has a nasty set of conflicts with the exynos MCT code, which was
moved in a separate branch, and then fixed up when merged in, but still
conflicts a bit here. It should have been sorted out by this merge though.
For accurate accounting call contextidr_thread_switch before a
task is scheduled, rather than after, when the 'next' variable has a
different meaning since we switched the stacks.
Signed-off-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The ESR_EL1 decoding process is a bit cryptic, and KVM has also
a need for the same constants.
Add a new esr.h file containing the appropriate exception classes
constants, and change entry.S to use it. Fix a small bug in the
EL1 breakpoint check while we're at it.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
GENERIC_GPIO has been made equivalent to GPIOLIB in architecture code
and all driver code has been switch to depend on GPIOLIB. It is thus
safe to have GENERIC_GPIO removed.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
This converts arm and arm64 to use CLKSRC_OF DT based initialization for
the arch timer. A new function arch_timer_arch_init is added to allow for
arch specific setup.
This has a side effect of enabling sched_clock on omap5 and exynos5. There
should not be any reason not to use the arch timers for sched_clock.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-omap@vger.kernel.org
Cc: linux-sh@vger.kernel.org
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
This patch uses the generic irqchip_init() function for initialising the
interrupt controller on arm64. It also adds several definitions required
by the ARM GIC irqchip driver but does not enable ARM_GIC yet.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
With the (re)introduction of cpu_logical_map in arm64 we switch to
the use of MPIDR values to identify CPUs. Update the psci code to
do that.
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The 'CONFIG_' prefix is not implicit in IS_ENABLED().
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This patch implements the AArch64-specific atomic bitops functions using
exclusive memory accesses to avoid locking.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This patch introduces AArch64-specific memory functions (memcpy,
memmove, memchr, memset). These functions are not optimised for any CPU
implementation but can be used as a starting point once hardware is
available.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The reg property of the cpu nodes in the DT now contains all the
affinity levels in (MPIDR[39:32] and MPIDR[23:0]) and that's what
boot_secondary() writes in the pen, so increase the mask in
secondary_holding_pen accordingly.
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
When booting the kernel, the cpu logical id map must be initialised
using device tree data passed by FW or through an embedded blob.
This patch parses the reg property in device tree "cpu" nodes,
retrieves the corresponding CPUs hardware identifiers (MPIDR) and
initialises the cpu logical map accordingly.
The device tree HW identifiers are considered valid if all CPU nodes
contain a "reg" property, there are no duplicate "reg" entries and the
DT defines a CPU node whose "reg" property defines affinity levels
that matches those of the boot CPU.
The primary CPU is assigned cpu logical number 0 to keep the current
convention valid.
Based on a0ae024050 (ARM: kernel: add
device tree init map function).
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Change the prototype of write_pen_release() accordingly and clarify
that's holding the hardware id of the secondary that's going to boot.
This is in preparation of getting HWIDs parsed from the DT.
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This patch adds support for using earlyprintk with 8250/16550 UART
ports. The 8250/16550 UART can either have 8-bit or 32-bit aligned
registers which is HW vendor dependent.
Kernel args for 8-bit aligned regs: earlyprintk=uart8250-8bit,<phys_address>
Kernel args for 32-bit aligned regs: earlyprintk=uart8250-32bit,<phys_address>
Signed-off-by: Anup Patel <anup.patel@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Enable early_printk to use the FastModel semihosting to output
the early kernel messages. Works both for host and guest kernels.
To use this feature, pass "early_printk=smh" to the kernel.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
In order to preserve some kind of source compatibility between
arm and arm64, introduce read_cpuid_{implementor,part_number,mpidr}
which are used on KVM to find out which CPU we're running on.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The Kconfig entry for DEBUG_ERRORS is a verbatim copy of the former arm
entry for that symbol. It got removed in v2.6.39 because it wasn't
actually used anywhere. There are still no users of DEBUG_ERRORS so
remove this entry too.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
[catalin.marinas@arm.com: removed option from defconfig]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Config option GENERIC_HARDIRQS_NO_DEPRECATED was removed in commit
78c8982564 ("genirq: Remove the now obsolete
config options and select statements"), but the select was accidentally
reintroduced in commit 8c2c3df31e ("arm64:
Build infrastructure").
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The expression to compute the padding needed to fill the uc_sigmask field
to 1024 bits actually computes the padding needed for 1080 bits.
Fortunately, due to the 16-byte alignment of the following field
(uc_mcontext) the definition in glibc contains enough bytes of padding
after uc_sigmask so that the overall offsets and size match in both
definitions.
Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The __atomic_hash is only defined when SMP is enabled but the
arm64ksyms.c exports it even for the UP case.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Pull signal/compat fixes from Al Viro:
"Fixes for several regressions introduced in the last signal.git pile,
along with fixing bugs in truncate and ftruncate compat (on just about
anything biarch at least one of those two had been done wrong)."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal:
compat: restore timerfd settime and gettime compat syscalls
[regression] braino in "sparc: convert to ksignal"
fix compat truncate/ftruncate
switch lseek to COMPAT_SYSCALL_DEFINE
lseek() and truncate() on sparc really need sign extension
This branch contains the usual set of individual driver improvements and
bug fixes, as well as updates to the core code. The more notable changes
include:
- Internally add new API for referencing GPIOs by gpio_desc instead of
number. Eventually this will become a public API
- ACPI GPIO binding support
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Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux
Pull GPIO changes from Grant Likely:
"This branch contains the usual set of individual driver improvements
and bug fixes, as well as updates to the core code. The more notable
changes include:
- Internally add new API for referencing GPIOs by gpio_desc instead
of number. Eventually this will become a public API
- ACPI GPIO binding support"
* tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux: (33 commits)
arm64: select ARCH_WANT_OPTIONAL_GPIOLIB
gpio: em: Use irq_domain_add_simple() to fix runtime error
gpio: using common order: let 'static const' instead of 'const static'
gpio/vt8500: memory cleanup missing
gpiolib: Fix locking on gpio debugfs files
gpiolib: let gpio_chip reference its descriptors
gpiolib: use descriptors internally
gpiolib: use gpio_chips list in gpiochip_find_base
gpiolib: use gpio_chips list in sysfs ops
gpiolib: use gpio_chips list in gpiochip_find
gpiolib: use gpio_chips list in gpiolib_sysfs_init
gpiolib: link all gpio_chips using a list
gpio/langwell: cleanup driver
gpio/langwell: Add Cloverview ids to pci device table
gpio/lynxpoint: add chipset gpio driver.
gpiolib: add missing braces in gpio_direction_show
gpiolib-acpi: Fix error checks in interrupt requesting
gpio: mpc8xxx: don't set IRQ_TYPE_NONE when creating irq mapping
gpiolib: remove gpiochip_reserve()
arm: pxa: tosa: do not use gpiochip_reserve()
...
lockdep, but it's a mechanical change.
Cheers,
Rusty.
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Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux
Pull module update from Rusty Russell:
"The sweeping change is to make add_taint() explicitly indicate whether
to disable lockdep, but it's a mechanical change."
* tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
MODSIGN: Add option to not sign modules during modules_install
MODSIGN: Add -s <signature> option to sign-file
MODSIGN: Specify the hash algorithm on sign-file command line
MODSIGN: Simplify Makefile with a Kconfig helper
module: clean up load_module a little more.
modpost: Ignore ARC specific non-alloc sections
module: constify within_module_*
taint: add explicit flag to show whether lock dep is still OK.
module: printk message when module signature fail taints kernel.
Pull signal handling cleanups from Al Viro:
"This is the first pile; another one will come a bit later and will
contain SYSCALL_DEFINE-related patches.
- a bunch of signal-related syscalls (both native and compat)
unified.
- a bunch of compat syscalls switched to COMPAT_SYSCALL_DEFINE
(fixing several potential problems with missing argument
validation, while we are at it)
- a lot of now-pointless wrappers killed
- a couple of architectures (cris and hexagon) forgot to save
altstack settings into sigframe, even though they used the
(uninitialized) values in sigreturn; fixed.
- microblaze fixes for delivery of multiple signals arriving at once
- saner set of helpers for signal delivery introduced, several
architectures switched to using those."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (143 commits)
x86: convert to ksignal
sparc: convert to ksignal
arm: switch to struct ksignal * passing
alpha: pass k_sigaction and siginfo_t using ksignal pointer
burying unused conditionals
make do_sigaltstack() static
arm64: switch to generic old sigaction() (compat-only)
arm64: switch to generic compat rt_sigaction()
arm64: switch compat to generic old sigsuspend
arm64: switch to generic compat rt_sigqueueinfo()
arm64: switch to generic compat rt_sigpending()
arm64: switch to generic compat rt_sigprocmask()
arm64: switch to generic sigaltstack
sparc: switch to generic old sigsuspend
sparc: COMPAT_SYSCALL_DEFINE does all sign-extension as well as SYSCALL_DEFINE
sparc: kill sign-extending wrappers for native syscalls
kill sparc32_open()
sparc: switch to use of generic old sigaction
sparc: switch sys_compat_rt_sigaction() to COMPAT_SYSCALL_DEFINE
mips: switch to generic sys_fork() and sys_clone()
...
Introduce a new API vmemmap_free() to free and remove vmemmap
pagetables. Since pagetable implements are different, each architecture
has to provide its own version of vmemmap_free(), just like
vmemmap_populate().
Note: vmemmap_free() is not implemented for ia64, ppc, s390, and sparc.
[mhocko@suse.cz: fix implicit declaration of remove_pagetable]
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Wu Jianguo <wujianguo@huawei.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
An architecture should not unconditionally enable 'GENERIC_GPIO'
without providing an implementation. In case of arm64, selecting
ARCH_WANT_OPTIONAL_GPIOLIB is the right solution, because it
lets us enable GPIOLIB when configuring the kernel, and that
implicitly turns on GENERIC_GPIO.
Reported-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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.
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Merge tag 'virt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
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
...
interface).
- Simple earlyprintk support.
- Platform devices populated by default from the DT (SoC-agnostic).
- CONTEXTIDR support (used by external trace tools).
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Merge tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64
Pull arm64 patches from Catalin Marinas:
- SMP support for the PSCI booting protocol (power state coordination
interface).
- Simple earlyprintk support.
- Platform devices populated by default from the DT (SoC-agnostic).
- CONTEXTIDR support (used by external trace tools).
* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64:
arm64: mm: update CONTEXTIDR register to contain PID of current process
arm64: atomics: fix grossly inconsistent asm constraints for exclusives
arm64: compat: use compat_uptr_t type for compat_ucontext.uc_link
arm64: Select ARCH_WANT_FRAME_POINTERS
arm64: Add kvm_para.h and xor.h generic headers
arm64: SMP: enable PSCI boot method
arm64: psci: add support for PSCI invocations from the kernel
arm64: SMP: rework the SMP code to be enabling method agnostic
arm64: perf: add guest vs host discrimination
arm64: add COMPAT_PSR_*_BIT flags
arm64: Add simple earlyprintk support
arm64: Populate the platform devices
- Rework of the ACPI namespace scanning code from Rafael J. Wysocki
with contributions from Bjorn Helgaas, Jiang Liu, Mika Westerberg,
Toshi Kani, and Yinghai Lu.
- ACPI power resources handling and ACPI device PM update from
Rafael J. Wysocki.
- ACPICA update to version 20130117 from Bob Moore and Lv Zheng
with contributions from Aaron Lu, Chao Guan, Jesper Juhl, and
Tim Gardner.
- Support for Intel Lynxpoint LPSS from Mika Westerberg.
- cpuidle update from Len Brown including Intel Haswell support, C1
state for intel_idle, removal of global pm_idle.
- cpuidle fixes and cleanups from Daniel Lezcano.
- cpufreq fixes and cleanups from Viresh Kumar and Fabio Baltieri
with contributions from Stratos Karafotis and Rickard Andersson.
- Intel P-states driver for Sandy Bridge processors from
Dirk Brandewie.
- cpufreq driver for Marvell Kirkwood SoCs from Andrew Lunn.
- cpufreq fixes related to ordering issues between acpi-cpufreq and
powernow-k8 from Borislav Petkov and Matthew Garrett.
- cpufreq support for Calxeda Highbank processors from Mark Langsdorf
and Rob Herring.
- cpufreq driver for the Freescale i.MX6Q SoC and cpufreq-cpu0 update
from Shawn Guo.
- cpufreq Exynos fixes and cleanups from Jonghwan Choi, Sachin Kamat,
and Inderpal Singh.
- Support for "lightweight suspend" from Zhang Rui.
- Removal of the deprecated power trace API from Paul Gortmaker.
- Assorted updates from Andreas Fleig, Colin Ian King,
Davidlohr Bueso, Joseph Salisbury, Kees Cook, Li Fei,
Nishanth Menon, ShuoX Liu, Srinivas Pandruvada, Tejun Heo,
Thomas Renninger, and Yasuaki Ishimatsu.
/
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Merge tag 'pm+acpi-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management updates from Rafael Wysocki:
- Rework of the ACPI namespace scanning code from Rafael J. Wysocki
with contributions from Bjorn Helgaas, Jiang Liu, Mika Westerberg,
Toshi Kani, and Yinghai Lu.
- ACPI power resources handling and ACPI device PM update from Rafael
J Wysocki.
- ACPICA update to version 20130117 from Bob Moore and Lv Zheng with
contributions from Aaron Lu, Chao Guan, Jesper Juhl, and Tim Gardner.
- Support for Intel Lynxpoint LPSS from Mika Westerberg.
- cpuidle update from Len Brown including Intel Haswell support, C1
state for intel_idle, removal of global pm_idle.
- cpuidle fixes and cleanups from Daniel Lezcano.
- cpufreq fixes and cleanups from Viresh Kumar and Fabio Baltieri with
contributions from Stratos Karafotis and Rickard Andersson.
- Intel P-states driver for Sandy Bridge processors from Dirk
Brandewie.
- cpufreq driver for Marvell Kirkwood SoCs from Andrew Lunn.
- cpufreq fixes related to ordering issues between acpi-cpufreq and
powernow-k8 from Borislav Petkov and Matthew Garrett.
- cpufreq support for Calxeda Highbank processors from Mark Langsdorf
and Rob Herring.
- cpufreq driver for the Freescale i.MX6Q SoC and cpufreq-cpu0 update
from Shawn Guo.
- cpufreq Exynos fixes and cleanups from Jonghwan Choi, Sachin Kamat,
and Inderpal Singh.
- Support for "lightweight suspend" from Zhang Rui.
- Removal of the deprecated power trace API from Paul Gortmaker.
- Assorted updates from Andreas Fleig, Colin Ian King, Davidlohr Bueso,
Joseph Salisbury, Kees Cook, Li Fei, Nishanth Menon, ShuoX Liu,
Srinivas Pandruvada, Tejun Heo, Thomas Renninger, and Yasuaki
Ishimatsu.
* tag 'pm+acpi-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (267 commits)
PM idle: remove global declaration of pm_idle
unicore32 idle: delete stray pm_idle comment
openrisc idle: delete pm_idle
mn10300 idle: delete pm_idle
microblaze idle: delete pm_idle
m32r idle: delete pm_idle, and other dead idle code
ia64 idle: delete pm_idle
cris idle: delete idle and pm_idle
ARM64 idle: delete pm_idle
ARM idle: delete pm_idle
blackfin idle: delete pm_idle
sparc idle: rename pm_idle to sparc_idle
sh idle: rename global pm_idle to static sh_idle
x86 idle: rename global pm_idle to static x86_idle
APM idle: register apm_cpu_idle via cpuidle
cpufreq / intel_pstate: Add kernel command line option disable intel_pstate.
cpufreq / intel_pstate: Change to disallow module build
tools/power turbostat: display SMI count by default
intel_idle: export both C1 and C1E
ACPI / hotplug: Fix concurrency issues and memory leaks
...
Pull irq core changes from Ingo Molnar:
"The biggest changes are the IRQ-work and printk changes from Frederic
Weisbecker, which prepare the code for 'full dynticks' (the ability to
stop or slow down the periodic tick arbitrarily, not just in idle time
as today):
- Don't stop tick with irq works pending. This fix is generally
useful and concerns archs that can't raise self IPIs.
- Flush irq works before CPU offlining.
- Introduce "lazy" irq works that can wait for the next tick to be
executed, unless it's stopped.
- Implement klogd wake up using irq work. This removes the ad-hoc
printk_tick()/printk_needs_cpu() hooks and make it working even in
dynticks mode.
- Cleanups and fixes."
* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq: Export enable/disable_percpu_irq()
arch Kconfig: Remove references to IRQ_PER_CPU
irq_work: Remove return value from the irq_work_queue() function
genirq: Avoid deadlock in spurious handling
printk: Wake up klogd using irq_work
irq_work: Make self-IPIs optable
irq_work: Warn if there's still work on cpu_down
irq_work: Flush work on CPU_DYING
irq_work: Don't stop the tick with pending works
nohz: Add API to check tick state
irq_work: Remove CONFIG_HAVE_IRQ_WORK
irq_work: Fix racy check on work pending flag
irq_work: Fix racy IRQ_WORK_BUSY flag setting
pm_idle() on arm64 was a synonym for default_idle(),
so remove it and invoke default_idle() directly.
Signed-off-by: Len Brown <len.brown@intel.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
__ARCH_WANT_SYS_RT_SIGACTION,
__ARCH_WANT_SYS_RT_SIGSUSPEND,
__ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND,
__ARCH_WANT_COMPAT_SYS_SCHED_RR_GET_INTERVAL - not used anymore
CONFIG_GENERIC_{SIGALTSTACK,COMPAT_RT_SIG{ACTION,QUEUEINFO,PENDING,PROCMASK}} -
can be assumed always set.
This patch is a port of 575320d62 ("ARM: 7445/1: mm: update CONTEXTIDR
register to contain PID of current process") from ARM that introduces a
new Kconfig option which, when enabled, causes the kernel to write the
PID of the current task into the CONTEXTIDR register on context switch.
This is useful when analysing hardware trace, since writes to this
register can be configured to emit an event into the trace stream.
Signed-off-by: Will Deacon <will.deacon@arm.com>
[catalin.marinas@arm.com: contextidr_thread_switch() moved to mmu_context.h]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Our uses of inline asm constraints for atomic operations are fairly
wild and varied. We basically need to guarantee the following:
1. Any instructions with barrier implications
(load-acquire/store-release) have a "memory" clobber
2. When performing exclusive accesses, the addresing mode is generated
using the "Q" constraint
3. Atomic blocks which use the condition flags, have a "cc" clobber
This patch addresses these concerns which, as well as fixing the
semantics of the code, stops GCC complaining about impossible asm
constraints.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
struct compat_ucontext * is a 64-bit pointer, so we need to use a
compat_uptr_t instead to avoid declaring a structure incompatible with
what AArch32 userspace expects.
Cc: <stable@vger.kernel.org>
Reported-by: Edmund Grimley-Evans <Edmund.Grimley-Evans@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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>
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>
Wire the PSCI implementation into the SMP secondary startup
code.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This patch adds support for the Power State Coordination Interface
defined by ARM, allowing Linux to request CPU-centric power-management
operations from firmware implementing the PSCI protocol.
Signed-off-by: Will Deacon <will.deacon@arm.com>
[Marc: s/u32/u64/ in the relevant spots, and switch from an initcall
to an simpler init function]
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
In order to introduce PSCI support, let the SMP code handle
multiple enabling methods. This also allow CPUs to be booted
using different methods (though this feels a bit weird...).
In the process, move the spin-table code to its own file.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Add minimal guest support to perf, so it can distinguish whether
the PMU interrupt was in the host or the guest, as well as collecting
some very basic information (guest PC, user vs kernel mode).
This is not feature complete though, as it doesn't support backtracing
in the guest.
Based on the x86 implementation, tested with KVM/arm64.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
In order to mess with the processor state when running 32bit
guests, define all the AArch32 PSR flags.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This patch adds support for "earlyprintk=" parameter on the kernel
command line. The format is:
earlyprintk=<name>[,<addr>][,<options>]
where <name> is the name of the (UART) device, e.g. "pl011", <addr> is
the I/O address. The <options> aren't currently used.
The mapping of the earlyprintk device is done very early during kernel
boot and there are restrictions on which functions it can call. A
special early_io_map() function is added which creates the mapping from
the pre-defined EARLY_IOBASE to the device I/O address passed via the
kernel parameter. The pgd entry corresponding to EARLY_IOBASE is
pre-populated in head.S during kernel boot.
Only PL011 is currently supported and it is assumed that the interface
is already initialised by the boot loader before the kernel is started.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This patch add a device_initcall() to populate the platform devices
(of_default_bus_match_table). This allows SoC implementations that do
not require earlier initcalls to avoid any platform-specific code under
arch/arm64.
GIC and generic timer initialisation is done via FDT and CPU notifiers
independently of the SoC code.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
The kernel's internal definition of ELF_NGREG uses struct pt_regs, which
means that we disagree with userspace on the size of coredumps since
glibc correctly uses the user-visible struct user_pt_regs.
This patch fixes our ELF_NGREG definition to use struct user_pt_regs
and introduces our own ELF_CORE_COPY_REGS to convert between the user
and kernel structure definitions.
Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Fix up all callers as they were before, with make one change: an
unsigned module taints the kernel, but doesn't turn off lockdep.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
There have been a number of new syscalls introduced to arch/arm/ since
the compat layer was implemented for arm64, so add pointers to the
relevant functions to the compat syscall table.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
if_changed (used by the *.dts->*.dtc rule) rebuilds files if they aren't
contained in $(targets). (make V=2 indicates this). Add $(dtb-y) to
$(targets) to prevent *.dtb from always being rebuilt. Note
This fixes a regression introduced by the .dtb rule rework in da4cbc6
"arm64: use new common dtc rule", although since arm64 doesn't actually
have any *.dts yet, this isn't a critical issue.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
This is mostly a port of dbf62d5006 ("ARM: mm: introduce L_PTE_VALID
for page table entries") and 26ffd0d43b ("ARM: mm: introduce present,
faulting entries for PAGE_NONE") from ARM, which makes use of present,
faulting page table entries for page table entries mapped as PROT_NONE.
The main difference with this implementation is that we can make use of
the two pte type bits in order to avoid allocating a software bit for
identifying PROT_NONE pages, instead reserving the 10b suffix for these
types of mappings.
This is required to prevent users from accessing such pages via syscalls
such as read/write over a pipe.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Marking non-present ptes as read-only can corrupt file ptes, breaking
things like swap and file mappings.
This patch ensures that we only manipulate user pte bits when the pte
is marked present.
Cc: <stable@vger.kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This patch is an arm64 version of ce73ec6db4 ("powerpc/vdso: Remove
redundant locking in update_vsyscall_tz()").
Timezone data is not protected, so the sequence counter is not required
to ensure consistency. Furthermore, having multiple paths updating the
counter leads to a race between update_vsyscall and update_vsyscall_tz,
so remove the timezone sequence counting from both the kernel and the
vdso.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This fixes up all of the smaller arches that had __dev* markings for
their platform-specific drivers.
CONFIG_HOTPLUG is going away as an option. As a result, the __dev*
markings need to be removed.
This change removes the use of __devinit, __devexit_p, __devinitdata,
__devinitconst, and __devexit from these drivers.
Based on patches originally written by Bill Pemberton, but redone by me
in order to handle some of the coding style issues better, by hand.
Cc: Bill Pemberton <wfp5p@virginia.edu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: Lennox Wu <lennox.wu@gmail.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Bob Liu <lliubbo@gmail.com>
Cc: Srinivas Kandagatla <srinivas.kandagatla@st.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Myron Stowe <myron.stowe@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Yong Zhang <yong.zhang0@gmail.com>
Cc: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Jan Glauber <jang@linux.vnet.ibm.com>
Cc: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Cc: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Commit 9b064fc3f9 (new helper:
compat_user_stack_pointer()) introduces a call to current_pt_regs()
which is defined in linux/ptrace.h, not currently included asm/compat.h.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Pull signal handling cleanups from Al Viro:
"sigaltstack infrastructure + conversion for x86, alpha and um,
COMPAT_SYSCALL_DEFINE infrastructure.
Note that there are several conflicts between "unify
SS_ONSTACK/SS_DISABLE definitions" and UAPI patches in mainline;
resolution is trivial - just remove definitions of SS_ONSTACK and
SS_DISABLED from arch/*/uapi/asm/signal.h; they are all identical and
include/uapi/linux/signal.h contains the unified variant."
Fixed up conflicts as per Al.
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal:
alpha: switch to generic sigaltstack
new helpers: __save_altstack/__compat_save_altstack, switch x86 and um to those
generic compat_sys_sigaltstack()
introduce generic sys_sigaltstack(), switch x86 and um to it
new helper: compat_user_stack_pointer()
new helper: restore_altstack()
unify SS_ONSTACK/SS_DISABLE definitions
new helper: current_user_stack_pointer()
missing user_stack_pointer() instances
Bury the conditionals from kernel_thread/kernel_execve series
COMPAT_SYSCALL_DEFINE: infrastructure
A few new features this merge-window. The most important one is
probably, that dma-debug now warns if a dma-handle is not checked with
dma_mapping_error by the device driver. This requires minor changes to
some architectures which make use of dma-debug. Most of these changes
have the respective Acks by the Arch-Maintainers.
Besides that there are updates to the AMD IOMMU driver for refactor the
IOMMU-Groups support and to make sure it does not trigger a hardware
erratum.
The OMAP changes (for which I pulled in a branch from Tony Lindgren's
tree) have a conflict in linux-next with the arm-soc tree. The conflict
is in the file arch/arm/mach-omap2/clock44xx_data.c which is deleted in
the arm-soc tree. It is safe to delete the file too so solve the
conflict. Similar changes are done in the arm-soc tree in the common
clock framework migration. A missing hunk from the patch in the IOMMU
tree will be submitted as a seperate patch when the merge-window is
closed.
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Merge tag 'iommu-updates-v3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu
Pull IOMMU updates from Joerg Roedel:
"A few new features this merge-window. The most important one is
probably, that dma-debug now warns if a dma-handle is not checked with
dma_mapping_error by the device driver. This requires minor changes
to some architectures which make use of dma-debug. Most of these
changes have the respective Acks by the Arch-Maintainers.
Besides that there are updates to the AMD IOMMU driver for refactor
the IOMMU-Groups support and to make sure it does not trigger a
hardware erratum.
The OMAP changes (for which I pulled in a branch from Tony Lindgren's
tree) have a conflict in linux-next with the arm-soc tree. The
conflict is in the file arch/arm/mach-omap2/clock44xx_data.c which is
deleted in the arm-soc tree. It is safe to delete the file too so
solve the conflict. Similar changes are done in the arm-soc tree in
the common clock framework migration. A missing hunk from the patch
in the IOMMU tree will be submitted as a seperate patch when the
merge-window is closed."
* tag 'iommu-updates-v3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (29 commits)
ARM: dma-mapping: support debug_dma_mapping_error
ARM: OMAP4: hwmod data: ipu and dsp to use parent clocks instead of leaf clocks
iommu/omap: Adapt to runtime pm
iommu/omap: Migrate to hwmod framework
iommu/omap: Keep mmu enabled when requested
iommu/omap: Remove redundant clock handling on ISR
iommu/amd: Remove obsolete comment
iommu/amd: Don't use 512GB pages
iommu/tegra: smmu: Move bus_set_iommu after probe for multi arch
iommu/tegra: gart: Move bus_set_iommu after probe for multi arch
iommu/tegra: smmu: Remove unnecessary PTC/TLB flush all
tile: dma_debug: add debug_dma_mapping_error support
sh: dma_debug: add debug_dma_mapping_error support
powerpc: dma_debug: add debug_dma_mapping_error support
mips: dma_debug: add debug_dma_mapping_error support
microblaze: dma-mapping: support debug_dma_mapping_error
ia64: dma_debug: add debug_dma_mapping_error support
c6x: dma_debug: add debug_dma_mapping_error support
ARM64: dma_debug: add debug_dma_mapping_error support
intel-iommu: Prevent devices with RMRRs from being placed into SI Domain
...
Compat counterpart of current_user_stack_pointer(); for most of the biarch
architectures those two are identical, but e.g. arm64 and arm use different
registers for stack pointer...
Note that amd64 variants of current_user_stack_pointer/compat_user_stack_pointer
do *not* rely on pt_regs having been through FIXUP_TOP_OF_STACK.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
All architectures have
CONFIG_GENERIC_KERNEL_THREAD
CONFIG_GENERIC_KERNEL_EXECVE
__ARCH_WANT_SYS_EXECVE
None of them have __ARCH_WANT_KERNEL_EXECVE and there are only two callers
of kernel_execve() (which is a trivial wrapper for do_execve() now) left.
Kill the conditionals and make both callers use do_execve().
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This function is used by sparc, powerpc tile and arm64 for compat support.
The patch adds a generic implementation with a wrapper for PowerPC to do
the u32->int sign extension.
The reason for a single patch covering powerpc, tile, sparc and arm64 is
to keep it bisectable, otherwise kernel building may fail with mismatched
function declarations.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Chris Metcalf <cmetcalf@tilera.com> [for tile]
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pull big execve/kernel_thread/fork unification series from Al Viro:
"All architectures are converted to new model. Quite a bit of that
stuff is actually shared with architecture trees; in such cases it's
literally shared branch pulled by both, not a cherry-pick.
A lot of ugliness and black magic is gone (-3KLoC total in this one):
- kernel_thread()/kernel_execve()/sys_execve() redesign.
We don't do syscalls from kernel anymore for either kernel_thread()
or kernel_execve():
kernel_thread() is essentially clone(2) with callback run before we
return to userland, the callbacks either never return or do
successful do_execve() before returning.
kernel_execve() is a wrapper for do_execve() - it doesn't need to
do transition to user mode anymore.
As a result kernel_thread() and kernel_execve() are
arch-independent now - they live in kernel/fork.c and fs/exec.c
resp. sys_execve() is also in fs/exec.c and it's completely
architecture-independent.
- daemonize() is gone, along with its parts in fs/*.c
- struct pt_regs * is no longer passed to do_fork/copy_process/
copy_thread/do_execve/search_binary_handler/->load_binary/do_coredump.
- sys_fork()/sys_vfork()/sys_clone() unified; some architectures
still need wrappers (ones with callee-saved registers not saved in
pt_regs on syscall entry), but the main part of those suckers is in
kernel/fork.c now."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (113 commits)
do_coredump(): get rid of pt_regs argument
print_fatal_signal(): get rid of pt_regs argument
ptrace_signal(): get rid of unused arguments
get rid of ptrace_signal_deliver() arguments
new helper: signal_pt_regs()
unify default ptrace_signal_deliver
flagday: kill pt_regs argument of do_fork()
death to idle_regs()
don't pass regs to copy_process()
flagday: don't pass regs to copy_thread()
bfin: switch to generic vfork, get rid of pointless wrappers
xtensa: switch to generic clone()
openrisc: switch to use of generic fork and clone
unicore32: switch to generic clone(2)
score: switch to generic fork/vfork/clone
c6x: sanitize copy_thread(), get rid of clone(2) wrapper, switch to generic clone()
take sys_fork/sys_vfork/sys_clone prototypes to linux/syscalls.h
mn10300: switch to generic fork/vfork/clone
h8300: switch to generic fork/vfork/clone
tile: switch to generic clone()
...
Conflicts:
arch/microblaze/include/asm/Kbuild
- Generic execve, kernel_thread, fork/vfork/clone.
- Preparatory patches for KVM support (initialising EL2 mode for later
installing KVM support, hypervisor stub).
- Signal handling corner case fix (alternative signal stack set up for a
SEGV handler, which is raised in response to RLIMIT_STACK being
reached).
- Sub-nanosecond timer error fix.
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Merge tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64
Pull ARM64 updates from Catalin Marinas:
- Generic execve, kernel_thread, fork/vfork/clone.
- Preparatory patches for KVM support (initialising EL2 mode for later
installing KVM support, hypervisor stub).
- Signal handling corner case fix (alternative signal stack set up for
a SEGV handler, which is raised in response to RLIMIT_STACK being
reached).
- Sub-nanosecond timer error fix.
* tag 'arm64-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64: (30 commits)
arm64: Update the MAINTAINERS entry
arm64: compat for clock_adjtime(2) is miswired
arm64: move FP-SIMD save/restore code to a macro
arm64: hyp: initialize vttbr_el2 to zero
arm64: add hypervisor stub
arm64: record boot mode when entering the kernel
arm64: move vector entry macro to assembler.h
arm64: add AArch32 execution modes to ptrace.h
arm64: expand register mapping between AArch32 and AArch64
arm64: generic timer: use virtual counter instead of physical at EL0
arm64: vdso: defer shifting of nanosecond component of timespec
arm64: vdso: rework __do_get_tspec register allocation and return shift
arm64: vdso: check sequence counter even for coarse realtime operations
arm64: vdso: fix clocksource mask when extracting bottom 56 bits
ARM64: Remove incorrect Kconfig symbol HAVE_SPARSE_IRQ
Documentation: Fixes a word in Documentation/arm64/memory.txt
arm64: Make !dirty ptes read-only
arm64: Convert empty flush_cache_{mm,page} functions to static inline
arm64: signal: let the compiler inline compat_get_sigframe
arm64: signal: return struct rt_sigframe from get_sigframe
...
Conflicts:
arch/arm64/include/asm/unistd32.h
Pull perf updates from Ingo Molnar:
"Lots of activity:
211 files changed, 8328 insertions(+), 4116 deletions(-)
most of it on the tooling side.
Main changes:
* ftrace enhancements and fixes from Steve Rostedt.
* uprobes fixes, cleanups and preparation for the ARM port from Oleg
Nesterov.
* UAPI fixes, from David Howels - prepares the arch/x86 UAPI
transition
* Separate perf tests into multiple objects, one per test, from Jiri
Olsa.
* Make hardware event translations available in sysfs, from Jiri
Olsa.
* Fixes to /proc/pid/maps parsing, preparatory to supporting data
maps, from Namhyung Kim
* Implement ui_progress for GTK, from Namhyung Kim
* Add framework for automated perf_event_attr tests, where tools with
different command line options will be run from a 'perf test', via
python glue, and the perf syscall will be intercepted to verify
that the perf_event_attr fields set by the tool are those expected,
from Jiri Olsa
* Add a 'link' method for hists, so that we can have the leader with
buckets for all the entries in all the hists. This new method is
now used in the default 'diff' output, making the sum of the
'baseline' column be 100%, eliminating blind spots.
* libtraceevent fixes for compiler warnings trying to make perf it
build on some distros, like fedora 14, 32-bit, some of the warnings
really pointed to real bugs.
* Add a browser for 'perf script' and make it available from the
report and annotate browsers. It does filtering to find the
scripts that handle events found in the perf.data file used. From
Feng Tang
* perf inject changes to allow showing where a task sleeps, from
Andrew Vagin.
* Makefile improvements from Namhyung Kim.
* Add --pre and --post command hooks in 'stat', from Peter Zijlstra.
* Don't stop synthesizing threads when one vanishes, this is for the
existing threads when we start a tool like trace.
* Use sched:sched_stat_runtime to provide a thread summary, this
produces the same output as the 'trace summary' subcommand of
tglx's original "trace" tool.
* Support interrupted syscalls in 'trace'
* Add an event duration column and filter in 'trace'.
* There are references to the man pages in some tools, so try to
build Documentation when installing, warning the user if that is
not possible, from Borislav Petkov.
* Give user better message if precise is not supported, from David
Ahern.
* Try to find cross-built objdump path by using the session
environment information in the perf.data file header, from Irina
Tirdea, original patch and idea by Namhyung Kim.
* Diplays more output on features check for make V=1, so that one can
figure out what is happening by looking at gcc output, etc. From
Jiri Olsa.
* Add on_exit implementation for systems without one, e.g. Android,
from Bernhard Rosenkraenzer.
* Only process events for vcpus of interest, helps handling large
number of events, from David Ahern.
* Cross compilation fixes for Android, from Irina Tirdea.
* Add documentation on compiling for Android, from Irina Tirdea.
* perf diff improvements from Jiri Olsa.
* Target (task/user/cpu/syswide) handling improvements, from Namhyung
Kim.
* Add support in 'trace' for tracing workload given by command line,
from Namhyung Kim.
* ... and much more."
* 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (194 commits)
uprobes: Use percpu_rw_semaphore to fix register/unregister vs dup_mmap() race
perf evsel: Introduce is_group_member method
perf powerpc: Use uapi/unistd.h to fix build error
tools: Pass the target in descend
tools: Honour the O= flag when tool build called from a higher Makefile
tools: Define a Makefile function to do subdir processing
perf ui: Always compile browser setup code
perf ui: Add ui_progress__finish()
perf ui gtk: Implement ui_progress functions
perf ui: Introduce generic ui_progress helper
perf ui tui: Move progress.c under ui/tui directory
perf tools: Add basic event modifier sanity check
perf tools: Omit group members from perf_evlist__disable/enable
perf tools: Ensure single disable call per event in record comand
perf tools: Fix 'disabled' attribute config for record command
perf tools: Fix attributes for '{}' defined event groups
perf tools: Use sscanf for parsing /proc/pid/maps
perf tools: Add gtk.<command> config option for launching GTK browser
perf tools: Fix compile error on NO_NEWT=1 build
perf hists: Initialize all of he->stat with zeroes
...
Bug fixes, little cleanups, and documentation changes. The most invasive
thing here touches a bunch of the arch directories to use a common build
rule for .dtb files. There are no major changes to functionality here
other than a ew new helper functions.
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Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux-2.6
Pull device tree changes from Grant Likely:
"Here are the DT changes I've got queued up for v3.8. As described
below, there are a lot of bug fixes here and documentation updates but
nothing major:
Bug fixes, little cleanups, and documentation changes. The most
invasive thing here touches a bunch of the arch directories to use a
common build rule for .dtb files. There are no major changes to
functionality here other than a few new helper functions."
* tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux-2.6: (34 commits)
arm64: Fix the dtbs target building
mtd: nand: davinci: fix the binding documentation
rtc: rtc-mv: Add the device tree binding documentation
devicetree/bindings: Move gpio-leds binding into leds directory
of/vendor-prefixes: add Imagination Technologies
microblaze: use new common dtc rule
c6x: use new common dtc rule
openrisc: use new common dtc rule
arm64: Add dtbs target for building all the enabled dtb files
arm64: use new common dtc rule
ARM: dt: change .dtb build rules to build in dts directory
kbuild: centralize .dts->.dtb rule
Fix build when CONFIG_W1_MASTER_GPIO=m b exporting "allnodes"
of/spi: Honour "status=disabled" property of device
of_mdio: Honour "status=disabled" property of device
of_i2c: Honour "status=disabled" property of device
powerpc: Fix fallout from device_node->name constification
of: add 'const' for of_parse_phandle parameter *np
Documentation: correct of_platform_populate() argument list
script: dtc: clean generated files
...
The arch/arm64/Makefile was not passing the right target to the
boot/dts/Makefile.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
struct timex is different on arm and arm64; adjtimex(2) takes care to
convert, clock_adjtime(2) doesn't...
Signed-off-by: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
In order to be able to reuse the save-restore code in KVM, move
it to a pair of macros, similar to what the 32bit code does.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The architecture doesn't mandate any reset value for vttbr_el2.
Better set it to a known value before some HYP code gets confused.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
If booted in EL2, install an dummy hypervisor whose only purpose
is to be replaced by a full fledged one.
A minimal API allows to:
- obtain the current HYP vectors (__hyp_get_vectors)
- set new HYP vectors (__hyp_set_vectors)
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
To be able to signal the availability of EL2 to other parts of
the kernel, record the boot mode.
Once booted, two predicates indicate if HYP mode is available,
and if not, whether this is due to a boot mode mismatch or not.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This macro is also useful to other bits defining vectors (hypervisor
stub, KVM...).
Move it to a common location.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The general purpose registers in AArch32 are mapped in an
architecturally defined manner into the AArch64 registers.
It allows the AArch32 registers of an application or a virtual
machine to be inspected by the OS or an hypervisor.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
We want to use the virtual counter at EL0, as the physical counter
may not track the current clocksource for guests running under a
hypervisor.
This patch updates the vdso and generic timer driver to use the virtual
counter. The kernel EL2 entry code is also updated to ensure that the
virtual offset is initialised to zero.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Shifting the nanosecond component of the computed timespec early can
lead to sub-ns inaccuracies when using the truncated value as input to
further arithmetic for things like conversions to monotonic time.
This patch defers the timespec shifting until after the final value has
been computed.
Reported-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
In preparation for sub-ns precision in the vdso timespec maths, change
the __do_get_tspec register allocation so that we return the clocksource
shift value instead of the unused xtime tspec.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
When returning coarse realtime values from clock_gettime, we must still
check the sequence counter to ensure that the kernel does not update
the vdso datapage whilst we are loading the coarse timespec as this
could potentially result in time appearing to go backwards.
This patch delays the coarse realtime check until after we have loaded
successfully from the vdso datapage. This does mean that we always load
the wtm timespec, but conditionalising the load and adding an extra
sequence test is unlikely to buy us anything other than messy code,
particularly as the sequence test implies a read barrier.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The generic timer clocksource has 56 bits of precision and as such must
be masked appropriately after we have read it. The current mask
generated by a movn instruction is off by 4 bits, so we accidentally
include the top 4 bits in the final value.
This patch fixes the broken mask.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Based on Rob Herring's patches for arch/arm, this patch adds a dtbs
target to arch/arm64/boot/Makefile.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
The current rules have the .dtb files build in a different directory
from the .dts files. This patch changes arm64 to use the generic dtb
rule which builds .dtb files in the same directory as the source .dts.
This requires moving parts of arch/arm64/boot/Makefile into newly created
arch/arm64/boot/dts/Makefile, and updating arch/arm64/Makefile to call the
new Makefile.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
The usual rules for open()/openat()/open_by_handle_at() are
1) native 32bit - don't force O_LARGEFILE in flags
2) native 64bit - force O_LARGEFILE in flags
3) compat on 64bit host - as for native 32bit
4) native 32bit ABI for 64bit system (mips/n32, x86/x32) - as for
native 64bit
There are only two exceptions - s390 compat has open() forcing
O_LARGEFILE and arm64 compat has open_by_handle_at() doing the same
thing. The same binaries on native host (s390/31 and arm resp.) will
*not* force O_LARGEFILE, so IMO both are emulation bugs.
Objections? The fix is obvious...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Kernel does not contain symbol HAVE_SPARSE_IRQ. Definition
in arch/arm64/Kconfig seems typo because valid symbol is
MAY_HAVE_SPARSE_IRQ.
In any case SPARSE_IRQ is selected by default and we just
remove selecting of this symbol.
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
The AArch64 Linux port relies on the mm code to wrprotect clean ptes.
This however is not the case with newly created ptes and
PAGE_SHARED(_EXEC) is writable but !dirty.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
Add dma-debug interface debug_dma_mapping_error() to debug drivers that fail
to check dma mapping errors on addresses returned by dma_map_single() and
dma_map_page() interfaces.
Signed-off-by: Shuah Khan <shuah.khan@hp.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
There's no reason to mark compat_get_sigframe inline explicitly, so
remove the annotation and let the compiler decide what's best.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
We only have one type of frame (rt_sigframe) for arm64, so just return
that type directly and dispense with the framesize argument, which is
presumably a hangover from code copied from arch/arm/.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
setup_return is a void function, so make compat_setup_return look the
same rather then unconditionally return 0.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
To allow debuggers to unwind through signal frames, we create a fake
stack unwinding prologue containing the link register and frame pointer
of the interrupted context. The signal frame is then offset by 16 bytes
to make room for the two saved registers which are pushed onto the frame
of the *interrupted* context, rather than placed directly above the
signal stack.
This doesn't work when an alternative signal stack is set up for a SEGV
handler, which is raised in response to RLIMIT_STACK being reached. In
this case, we try to push the unwinding prologue onto the full stack and
subsequently take a fault which we fail to resolve, causing setup_return
to return -EFAULT and handle_signal to force_sigsegv on the current task.
This patch fixes the problem by including the unwinding prologue as part
of the rt_sigframe definition, which is populated during setup_sigframe,
ensuring that it always ends up on the signal stack.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: <stable@vger.kernel.org>
This patch updates the arm64 asm/Kbuild file to include the clkdev.h
generic header.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Viresh Kumar <Viresh.kumar@linaro.org>
Force all platforms to use the common clk framework to ensure that we do
not end up with platform-specific implementations ala ARM32.
Signed-off-by: Deepak Saxena <dsaxena@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
irq work can run on any arch even without IPI
support because of the hook on update_process_times().
So lets remove HAVE_IRQ_WORK because it doesn't reflect
any backend requirement.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Backmerge from mainline commit that introduced a trivial conflict in
arch/arm64/kernel/process.c - a bunch of functions removed next to the
place where kernel_thread() used to be.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
On AArch64, the meaning of the XN bit has changed to UXN (user). The PXN
(privileged) bit must be set to prevent kernel execution. Without the
PXN bit set, the CPU may speculatively access device memory. This patch
ensures that all the mappings that the kernel must not execute from
(including user mappings) have the PXN bit set.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Commit f483a853b0 ("arm64: mm: fix booting on systems with no memory
below 4GB") sets max_dma32 to the minimum of the maximum pfn and
MAX_DMA32_PFN. This value is later used as the base of the NORMAL zone,
which is incorrect when MAX_DMA32_PFN is below the minimum pfn (i.e. all
memory is above 4GB).
This patch fixes the problem by ensuring that max_dma32 is always set to
the end of the DMA32 zone.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
For user space faults the kernel reports "unhandled page fault" and it
gives the ESR value. With this patch the error message looked up in the
fault info array to give a better description.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
In order to promote interoperability between userspace tracers and ftrace,
add a trace_clock that reports raw TSC values which will then be recorded
in the ring buffer. Userspace tracers that also record TSCs are then on
exactly the same time base as the kernel and events can be unambiguously
interlaced.
Tested: Enabled a tracepoint and the "tsc" trace_clock and saw very large
timestamp values.
v2:
Move arch-specific bits out of generic code.
v3:
Rename "x86-tsc", cleanups
v7:
Generic arch bits in Kbuild.
Google-Bug-Id: 6980623
Link: http://lkml.kernel.org/r/1352837903-32191-1-git-send-email-dhsharp@google.com
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@linux.intel.com>
Signed-off-by: David Sharp <dhsharp@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Booting on a system with all of its memory above the 4GB boundary breaks
for two reasons:
(1) We still try to create a non-empty DMA32 zone
(2) no-bootmem limits allocations to 0xffffffff
This patch fixes these issues for ARM64.
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Commit 149c24151e ("ARM: SMP: use a timing out completion for cpu
hotplug") modified arm's CPU up path to use completions. It seems that
we only got half of this patch for arm64, so add the missing call to
complete.
Reported-by: Jon Brawn <jon.brawn@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
