Another week, another batch of fixes for arm-soc platforms.
Again, nothing controversial. A few more than would be ideal, but all
are valid fixes. In particular the prima2 panic patch is critical since
it fixes a problem where multiplatform kernels panic on all but prima2
hardware.
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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Olof Johansson:
"These are a little later than I planned on since I got caught up with
handling merges for 3.11 most of the week.
Another week, another batch of fixes for arm-soc platforms.
Again, nothing controversial. A few more than would be ideal, but all
are valid fixes. In particular the prima2 panic patch is critical
since it fixes a problem where multiplatform kernels panic on all but
prima2 hardware."
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
ARM: SAMSUNG: pm: Adjust for pinctrl- and DT-enabled platforms
ARM: prima2: fix incorrect panic usage
arm: mvebu: armada-xp-{gp,openblocks-ax3-4}: specify PCIe range
ARM: Kirkwood: handle mv88f6282 cpu in __kirkwood_variant().
ARM: omap3: clock: fix wrong container_of in clock36xx.c
ARM: dts: OMAP5: Fix missing PWM capability to timer nodes
ARM: dts: omap4-panda|sdp: Fix mux for twl6030 IRQ pin and msecure line
ARM: dts: AM33xx: Fix properties on gpmc node
arm: omap2: fix AM33xx hwmod infos for UART2
ARM: OMAP3: Fix iva2_pwrdm settings for 3703
Pull powerpc fixes from Benjamin Herrenschmidt:
"So here are 3 fixes still for 3.10. Fixes are simple, bugs are nasty
(though not recent regressions, nasty enough) and all targeted at
stable"
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
powerpc: Fix missing/delayed calls to irq_work
powerpc: Fix emulation of illegal instructions on PowerNV platform
powerpc: Fix stack overflow crash in resume_kernel when ftracing
When replaying interrupts (as a result of the interrupt occurring
while soft-disabled), in the case of the decrementer, we are exclusively
testing for a pending timer target. However we also use decrementer
interrupts to trigger the new "irq_work", which in this case would
be missed.
This change the logic to force a replay in both cases of a timer
boundary reached and a decrementer interrupt having actually occurred
while disabled. The former test is still useful to catch cases where
a CPU having been hard-disabled for a long time completely misses the
interrupt due to a decrementer rollover.
CC: <stable@vger.kernel.org> [v3.4+]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Normally, the kernel emulates a few instructions that are unimplemented
on some processors (e.g. the old dcba instruction), or privileged (e.g.
mfpvr). The emulation of unimplemented instructions is currently not
working on the PowerNV platform. The reason is that on these machines,
unimplemented and illegal instructions cause a hypervisor emulation
assist interrupt, rather than a program interrupt as on older CPUs.
Our vector for the emulation assist interrupt just calls
program_check_exception() directly, without setting the bit in SRR1
that indicates an illegal instruction interrupt. This fixes it by
making the emulation assist interrupt set that bit before calling
program_check_interrupt(). With this, old programs that use no-longer
implemented instructions such as dcba now work again.
CC: <stable@vger.kernel.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
It's possible for us to crash when running with ftrace enabled, eg:
Bad kernel stack pointer bffffd12 at c00000000000a454
cpu 0x3: Vector: 300 (Data Access) at [c00000000ffe3d40]
pc: c00000000000a454: resume_kernel+0x34/0x60
lr: c00000000000335c: performance_monitor_common+0x15c/0x180
sp: bffffd12
msr: 8000000000001032
dar: bffffd12
dsisr: 42000000
If we look at current's stack (paca->__current->stack) we see it is
equal to c0000002ecab0000. Our stack is 16K, and comparing to
paca->kstack (c0000002ecab3e30) we can see that we have overflowed our
kernel stack. This leads to us writing over our struct thread_info, and
in this case we have corrupted thread_info->flags and set
_TIF_EMULATE_STACK_STORE.
Dumping the stack we see:
3:mon> t c0000002ecab0000
[c0000002ecab0000] c00000000002131c .performance_monitor_exception+0x5c/0x70
[c0000002ecab0080] c00000000000335c performance_monitor_common+0x15c/0x180
--- Exception: f01 (Performance Monitor) at c0000000000fb2ec .trace_hardirqs_off+0x1c/0x30
[c0000002ecab0370] c00000000016fdb0 .trace_graph_entry+0xb0/0x280 (unreliable)
[c0000002ecab0410] c00000000003d038 .prepare_ftrace_return+0x98/0x130
[c0000002ecab04b0] c00000000000a920 .ftrace_graph_caller+0x14/0x28
[c0000002ecab0520] c0000000000d6b58 .idle_cpu+0x18/0x90
[c0000002ecab05a0] c00000000000a934 .return_to_handler+0x0/0x34
[c0000002ecab0620] c00000000001e660 .timer_interrupt+0x160/0x300
[c0000002ecab06d0] c0000000000025dc decrementer_common+0x15c/0x180
--- Exception: 901 (Decrementer) at c0000000000104d4 .arch_local_irq_restore+0x74/0xa0
[c0000002ecab09c0] c0000000000fe044 .trace_hardirqs_on+0x14/0x30 (unreliable)
[c0000002ecab0fb0] c00000000016fe3c .trace_graph_entry+0x13c/0x280
[c0000002ecab1050] c00000000003d038 .prepare_ftrace_return+0x98/0x130
[c0000002ecab10f0] c00000000000a920 .ftrace_graph_caller+0x14/0x28
[c0000002ecab1160] c0000000000161f0 .__ppc64_runlatch_on+0x10/0x40
[c0000002ecab11d0] c00000000000a934 .return_to_handler+0x0/0x34
--- Exception: 901 (Decrementer) at c0000000000104d4 .arch_local_irq_restore+0x74/0xa0
... and so on
__ppc64_runlatch_on() is called from RUNLATCH_ON in the exception entry
path. At that point the irq state is not consistent, ie. interrupts are
hard disabled (by the exception entry), but the paca soft-enabled flag
may be out of sync.
This leads to the local_irq_restore() in trace_graph_entry() actually
enabling interrupts, which we do not want. Because we have not yet
reprogrammed the decrementer we immediately take another decrementer
exception, and recurse.
The fix is twofold. Firstly make sure we call DISABLE_INTS before
calling RUNLATCH_ON. The badly named DISABLE_INTS actually reconciles
the irq state in the paca with the hardware, making it safe again to
call local_irq_save/restore().
Although that should be sufficient to fix the bug, we also mark the
runlatch routines as notrace. They are called very early in the
exception entry and we are asking for trouble tracing them. They are
also fairly uninteresting and tracing them just adds unnecessary
overhead.
[ This regression was introduced by fe1952fc0a
"powerpc: Rework runlatch code" by myself --BenH
]
CC: <stable@vger.kernel.org> [v3.4+]
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This branch contains the following bug fixes:
- Fix locking vs. interrupts. Bug caught by lockdep checks
- Fix parsing of cpp #line directive output by dtc
- Fix 'make clean' for dtc temporary files.
There is also a commit that regenerates the dtc lexer and parser files
with Bison 2.5. The only purpose of this commit is to separate the
functional change in the dtc bug fix from the code generation change
caused by a different Bison version.
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Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux
Pull device tree bug fixes from Grant Likely:
"This branch contains the following bug fixes:
- Fix locking vs. interrupts. Bug caught by lockdep checks
- Fix parsing of cpp #line directive output by dtc
- Fix 'make clean' for dtc temporary files.
There is also a commit that regenerates the dtc lexer and parser files
with Bison 2.5. The only purpose of this commit is to separate the
functional change in the dtc bug fix from the code generation change
caused by a different Bison version"
* tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux:
dtc: ensure #line directives don't consume data from the next line
dtc: Update generated files to output from Bison 2.5
of: Fix locking vs. interrupts
kbuild: make sure we clean up DTB temporary files
The OF code uses irqsafe locks everywhere except in a handful of functions
for no obvious reasons. Since the conversion from the old rwlocks, this
now triggers lockdep warnings when used at interrupt time. At least one
driver (ibmvscsi) seems to be doing that from softirq context.
This converts the few non-irqsafe locks into irqsafe ones, making them
consistent with the rest of the code.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Pull x86 fixes from Peter Anvin:
"Another set of fixes, the biggest bit of this is yet another tweak to
the UEFI anti-bricking code; apparently we finally got some feedback
from Samsung as to what makes at least their systems fail. This set
should actually fix the boot regressions that some other systems (e.g.
SGI) have exhibited.
Other than that, there is a patch to avoid a panic with particularly
unhappy memory layouts and two minor protocol fixes which may or may
not be manifest bugs"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86: Fix typo in kexec register clearing
x86, relocs: Move __vvar_page from S_ABS to S_REL
Modify UEFI anti-bricking code
x86: Fix adjust_range_size_mask calling position
Pull s390 fixes from Martin Schwidefsky:
"Three kvm related memory management fixes, a fix for show_trace, a fix
for early console output and a patch from Ben to help prevent compile
errors in regard to irq functions (or our lack thereof)"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/pci: Implement IRQ functions if !PCI
s390/sclp: fix new line detection
s390/pgtable: make pgste lock an explicit barrier
s390/pgtable: Save pgste during modify_prot_start/commit
s390/dumpstack: fix address ranges for asynchronous and panic stack
s390/pgtable: Fix guest overindication for change bit
few users were reporting boot regressions in v3.9. This has now been
fixed with a more accurate "minimum storage requirement to avoid
bricking" value from Samsung (5K instead of 50%) and code to trigger
garbage collection when we near our limit - Matthew Garrett.
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Merge tag 'efi-urgent' into x86/urgent
* More tweaking to the EFI variable anti-bricking algorithm. Quite a
few users were reporting boot regressions in v3.9. This has now been
fixed with a more accurate "minimum storage requirement to avoid
bricking" value from Samsung (5K instead of 50%) and code to trigger
garbage collection when we near our limit - Matthew Garrett.
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Fixes a typo in register clearing code. Thanks to PaX Team for fixing
this originally, and James Troup for pointing it out.
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: http://lkml.kernel.org/r/20130605184718.GA8396@www.outflux.net
Cc: <stable@vger.kernel.org> v2.6.30+
Cc: PaX Team <pageexec@freemail.hu>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
The __vvar_page relocation should actually be listed in S_REL instead
of S_ABS. Oddly, this didn't always cause things to break, presumably
because there are no users for relocation information on 64 bits yet.
[ hpa: Not for stable - new code in 3.10 ]
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: http://lkml.kernel.org/r/20130611185652.GA23674@www.outflux.net
Reported-by: Michael Davidson <md@google.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Pull MIPS fixes from Ralf Baechle:
"Resurrect Alchemy platforms by invoking the WAIT instructions with
interrupts enabled. This still leaves the race condition between
testing TIF_NEED_RESCHED and the WAIT instruction for Alchemy
platforms which need a different fix than other MIPS platforms. But
at least it gets MIPS platforms flying again.
There are also fixes for two build errors (CONFIG_FTRACE=y with
CONFIG_DYNAMIC_FTRACE=n) and CONFIG_VIRTUALIZATION without CONFIG_KVM"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: ftrace: Add missing CONFIG_DYNAMIC_FTRACE
MIPS: include: mmu_context.h: Replace VIRTUALIZATION with KVM
MIPS: Alchemy: fix wait function
- mvebu
- fix PCIe ranges property so NOR flash is visible
- kirkwood
- fix identification of 88f6282 so MPPs can be set correctly
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Merge tag 'fixes-3.10-4' of git://git.infradead.org/users/jcooper/linux into fixes
From Jason Cooper, mvebu fixes for v3.10 round 4:
- mvebu
- fix PCIe ranges property so NOR flash is visible
- kirkwood
- fix identification of 88f6282 so MPPs can be set correctly
* tag 'fixes-3.10-4' of git://git.infradead.org/users/jcooper/linux:
arm: mvebu: armada-xp-{gp,openblocks-ax3-4}: specify PCIe range
ARM: Kirkwood: handle mv88f6282 cpu in __kirkwood_variant().
Signed-off-by: Olof Johansson <olof@lixom.net>
Pull kvm bugfixes from Gleb Natapov:
"There is one more fix for MIPS KVM ABI here, MIPS and PPC build
breakage fixes and a couple of PPC bug fixes"
* 'fixes' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
kvm/ppc/booke64: Fix lazy ee handling in kvmppc_handle_exit()
kvm/ppc/booke: Hold srcu lock when calling gfn functions
kvm/ppc/booke64: Disable e6500 support
kvm/ppc/booke64: Fix AltiVec interrupt numbers and build breakage
mips/kvm: Use KVM_REG_MIPS and proper size indicators for *_ONE_REG
kvm: Add definition of KVM_REG_MIPS
KVM: add kvm_para_available to asm-generic/kvm_para.h
EE is hard-disabled on entry to kvmppc_handle_exit(), so call
hard_irq_disable() so that PACA_IRQ_HARD_DIS is set, and soft_enabled
is unset.
Without this, we get warnings such as arch/powerpc/kernel/time.c:300,
and sometimes host kernel hangs.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
KVM core expects arch code to acquire the srcu lock when calling
gfn_to_memslot and similar functions.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
The previous patch made 64-bit booke KVM build again, but Altivec
support is still not complete, and we can't prevent the guest from
turning on Altivec (which can corrupt host state until state
save/restore is implemented). Disable e6500 on KVM until this is
fixed.
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Interrupt numbers defined for Book3E follows IVORs definition. Align
BOOKE_INTERRUPT_ALTIVEC_UNAVAIL and BOOKE_INTERRUPT_ALTIVEC_ASSIST to this
rule which also fixes the build breakage.
IVORs 32 and 33 are shared so reflect this in the interrupts naming.
This fixes a build break for 64-bit booke KVM.
Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This patch makes legacy code on suspend/resume path being executed
conditionally, on non-DT platforms only, to fix suspend/resume of
DT-enabled systems, for which the code is inappropriate.
Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[olof: add #include <linux/of.h>]
Signed-off-by: Olof Johansson <olof@lixom.net>
The API requires that the GET_ONE_REG and SET_ONE_REG ioctls have this
extra information encoded in the register identifiers.
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
In prima2, some functions of checking DT is registered in initcall
level. If it doesn't match the compatible name of sirf, kernel
will panic. It blocks the usage of multiplatform on other verndor.
The error message is in below.
Knic - not syncing: unable to find compatible pwrc node in dtb
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-rc3-00006-gd7f26ea-dirty #86
[<c0013adc>] (unwind_backtrace+0x0/0xf8) from [<c0011430>] (show_stack+0x10/0x1)
[<c0011430>] (show_stack+0x10/0x14) from [<c026f724>] (panic+0x90/0x1e8)
[<c026f724>] (panic+0x90/0x1e8) from [<c03267fc>] (sirfsoc_of_pwrc_init+0x24/0x)
[<c03267fc>] (sirfsoc_of_pwrc_init+0x24/0x58) from [<c0320864>] (do_one_initcal)
[<c0320864>] (do_one_initcall+0x90/0x150) from [<c0320a20>] (kernel_init_freeab)
[<c0320a20>] (kernel_init_freeable+0xfc/0x1c4) from [<c026b9e8>] (kernel_init+0)
[<c026b9e8>] (kernel_init+0x8/0xe4) from [<c000e158>] (ret_from_fork+0x14/0x3c)
Signen-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
This patch reworks the UEFI anti-bricking code, including an effective
reversion of cc5a080c and 31ff2f20. It turns out that calling
QueryVariableInfo() from boot services results in some firmware
implementations jumping to physical addresses even after entering virtual
mode, so until we have 1:1 mappings for UEFI runtime space this isn't
going to work so well.
Reverting these gets us back to the situation where we'd refuse to create
variables on some systems because they classify deleted variables as "used"
until the firmware triggers a garbage collection run, which they won't do
until they reach a lower threshold. This results in it being impossible to
install a bootloader, which is unhelpful.
Feedback from Samsung indicates that the firmware doesn't need more than
5KB of storage space for its own purposes, so that seems like a reasonable
threshold. However, there's still no guarantee that a platform will attempt
garbage collection merely because it drops below this threshold. It seems
that this is often only triggered if an attempt to write generates a
genuine EFI_OUT_OF_RESOURCES error. We can force that by attempting to
create a variable larger than the remaining space. This should fail, but if
it somehow succeeds we can then immediately delete it.
I've tested this on the UEFI machines I have available, but I don't have
a Samsung and so can't verify that it avoids the bricking problem.
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Lee, Chun-Y <jlee@suse.com> [ dummy variable cleanup ]
Cc: <stable@vger.kernel.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
- xen/tmem stopped working after a certain combination of modprobe/swapon was used
- cpu online/offlining would trigger WARN_ON.
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Merge tag 'stable/for-linus-3.10-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
Pull xen fixes from Konrad Rzeszutek Wilk:
"Two bug-fixes for regressions:
- xen/tmem stopped working after a certain combination of
modprobe/swapon was used
- cpu online/offlining would trigger WARN_ON."
* tag 'stable/for-linus-3.10-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
xen/tmem: Don't over-write tmem_frontswap_poolid after tmem_frontswap_init set it.
xen/smp: Fixup NOHZ per cpu data when onlining an offline CPU.
arch_ftrace_update_code and ftrace_modify_all_code are only
available if CONFIG_DYNAMIC_FTRACE is selected.
Fixes the following build problem on MIPS randconfig:
arch/mips/kernel/ftrace.c: In function 'arch_ftrace_update_code':
arch/mips/kernel/ftrace.c:31:2: error: implicit declaration of function
'ftrace_modify_all_code' [-Werror=implicit-function-declaration]
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Acked-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5435/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
The kvm_* symbols are only available if KVM is selected.
Fixes the following linking problem on a randconfig:
arch/mips/built-in.o: In function `local_flush_tlb_mm':
(.text+0x18a94): undefined reference to `kvm_local_flush_tlb_all'
arch/mips/built-in.o: In function `local_flush_tlb_range':
(.text+0x18d0c): undefined reference to `kvm_local_flush_tlb_all'
kernel/built-in.o: In function `__schedule':
core.c:(.sched.text+0x2a00): undefined reference to `kvm_local_flush_tlb_all'
mm/built-in.o: In function `use_mm':
(.text+0x30214): undefined reference to `kvm_local_flush_tlb_all'
fs/built-in.o: In function `flush_old_exec':
(.text+0xf0a0): undefined reference to `kvm_local_flush_tlb_all'
make: *** [vmlinux] Error 1
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Acked-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5437/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Only an interrupt can wake the core from 'wait', enable interrupts
locally before executing 'wait'.
[ralf@linux-mips.org: This leave the race between an interrupt that's
setting TIF_NEED_RESCHEd and entering the WAIT status. but at least it's
going to bring Alchemy back from the dead, so I'm going to apply this
patch.]
Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Cc: Maciej W. Rozycki <macro@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/5408/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
All architectures must implement IRQ functions. Since various
dependencies on !S390 were removed, there are various drivers that can
be selected but will fail to link. Provide a dummy implementation of
these functions for the !PCI case.
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: stable@vger.kernel.org # 3.9
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Pull powerpc fixes from Benjamin Herrenschmidt:
"This is purely regressions (though not all recent ones) or stable
material"
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
powerpc: Partial revert of "Context switch more PMU related SPRs"
powerpc/perf: Fix deadlock caused by calling printk() in PMU exception
powerpc/hw_breakpoints: Add DABRX cpu feature to fix 32-bit regression
powerpc/power8: Update denormalization handler
powerpc/pseries: Simplify denormalization handler
powerpc/power8: Fix oprofile and perf
powerpc/eeh: Don't check RTAS token to get PE addr
powerpc/pci: Check the bus address instead of resource address in pcibios_fixup_resources
Pull ARM fixes from Russell King:
"The biggest two fixes are fixing a compilation error with the
decompressor, and a problem with our __my_cpu_offset implementation.
Other changes are very trivial and small, which seems to be the way
for most -rc stuff."
* 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
ARM: 7747/1: pcpu: ensure __my_cpu_offset cannot be re-ordered across barrier()
ARM: 7750/1: update legacy CPU ID in decompressor cache support jump table
ARM: 7743/1: compressed/head.S: work around new binutils warning
ARM: 7742/1: topology: export cpu_topology
ARM: 7737/1: fix kernel decompressor compilation error with CONFIG_DEBUG_SEMIHOSTING
In commit 59affcd I added context switching of more PMU SPRs, because
they are potentially exposed to userspace on Power8. However despite me
being a smart arse in the commit message it's actually not correct. In
particular it interacts badly with a global perf record.
We will have to do something more complicated, but that will have to
wait for 3.11.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
In commit bc09c21 "Fix finding overflowed PMC in interrupt" we added
a printk() to the PMU exception handler. Unfortunately that is not safe.
The problem is that the PMU exception may run even when interrupts are
soft disabled, aka NMI context. We do this so that we can profile parts
of the kernel that have interrupts soft-disabled.
But by calling printk() from the exception handler, we can potentially
deadlock in the printk code on logbuf_lock, eg:
[c00000038ba575c0] c000000000081928 .vprintk_emit+0xa8/0x540
[c00000038ba576a0] c0000000007bcde8 .printk+0x48/0x58
[c00000038ba57710] c000000000076504 .perf_event_interrupt+0x2d4/0x490
[c00000038ba57810] c00000000001f6f8 .performance_monitor_exception+0x48/0x60
[c00000038ba57880] c0000000000032cc performance_monitor_common+0x14c/0x180
--- Exception: f01 (Performance Monitor) at c0000000007b25d4 ._raw_spin_lock_irq
+0x64/0xc0
[c00000038ba57bf0] c00000000007ed90 .devkmsg_read+0xd0/0x5a0
[c00000038ba57d00] c0000000001c2934 .vfs_read+0xc4/0x1e0
[c00000038ba57d90] c0000000001c2cd8 .SyS_read+0x58/0xd0
[c00000038ba57e30] c000000000009d54 syscall_exit+0x0/0x98
--- Exception: c01 (System Call) at 00001fffffbf6f7c
SP (3ffff6d4de10) is in userspace
Fix it by making sure we only call printk() when we are not in NMI
context.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Cc: <stable@vger.kernel.org> # 3.9
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
When introducing support for DABRX in 4474ef0, we broke older 32-bit CPUs
that don't have that register.
Some CPUs have a DABR but not DABRX. Configuration are:
- No 32bit CPUs have DABRX but some have DABR.
- POWER4+ and below have the DABR but no DABRX.
- 970 and POWER5 and above have DABR and DABRX.
- POWER8 has DAWR, hence no DABRX.
This introduces CPU_FTR_DABRX and sets it on appropriate CPUs. We use
the top 64 bits for CPU FTR bits since only 64 bit CPUs have this.
Processors that don't have the DABRX will still work as they will fall
back to software filtering these breakpoints via perf_exclude_event().
Signed-off-by: Michael Neuling <mikey@neuling.org>
Reported-by: "Gorelik, Jacob (335F)" <jacob.gorelik@jpl.nasa.gov>
cc: stable@vger.kernel.org (v3.9 only)
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
POWER8 can take a denormalisation exception on any VSX registers.
This does the extra 32 VSX registers we don't currently handle.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
The following simplifies the denorm code by using macros to generate the long
stream of almost identical instructions.
This patch results in no changes to the output binary, but removes a lot of
lines of code.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
In 2ac6f42 powerpc/cputable: Fix oprofile_cpu_type on power8
we broke all power8 hw events.
This reverts this change and uses oprofile_type instead. Perf now works
on POWER8 again and oprofile will revert to using timers on POWER8.
Kudos to mpe this fix.
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
RTAS token "ibm,get-config-addr-info" or ibm,get-config-addr-info2"
are used to retrieve the PE address according to PCI address, which
made up of domain/bus/slot/function. If we don't have those 2 tokens,
the domain/bus/slot/function would be used as the address for EEH
RTAS operations. Some older f/w might not have those 2 tokens and
that blocks the EEH functionality to be initialized. It was introduced
by commit e2af155c ("powerpc/eeh: pseries platform EEH initialization").
The patch skips the check on those 2 tokens so we can bring up EEH
functionality successfully. And domain/bus/slot/function will be
used as address for EEH RTAS operations.
Cc: <stable@vger.kernel.org> # v3.4+
Reported-by: Robert Knight <knight@princeton.edu>
Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Tested-by: Robert Knight <knight@princeton.edu>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
If a BAR has the value of 0, we would assume that it is unset yet and
then mark the resource as unset and would reassign it later. But after
commit 6c5705fe (powerpc/PCI: get rid of device resource fixups)
the pcibios_fixup_resources is invoked after the bus address was
translated to linux resource. So the value of res->start is resource
address. And since the resource and bus address may be different, we
should translate it to the bus address before doing the check.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Another week, another batch of fixes for arm-soc platforms.
Nothing controversial here, a handful of fixes for regressions and/or
serious problems across several of the platforms. Things are slowing
down nicely on fix rates for 3.10.
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Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Olof Johansson:
"Another week, another batch of fixes for arm-soc platforms.
Nothing controversial here, a handful of fixes for regressions and/or
serious problems across several of the platforms. Things are slowing
down nicely on fix rates for 3.10"
* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
ARM: exynos: add debug_ll_io_init() call in exynos_init_io()
ARM: EXYNOS: uncompress - print debug messages if DEBUG_LL is defined
ARM: shmobile: sh73a0: Update CMT clockevent rating to 80
sh-pfc: r8a7779: Don't group USB OVC and PENC pins
ARM: mxs: icoll: Fix interrupts gpio bank 0
ARM: imx: clk-imx6q: AXI clock select index is incorrect
ARM: bcm2835: override the HW UART periphid
ARM: mvebu: Fix bug in coherency fabric low level init function
ARM: Kirkwood: TS219: Fix crash by double PCIe instantiation
ARM: ux500: Provide supplies for AUX1, AUX2 and AUX3
ARM: ux500: Only configure wake-up reasons on ux500 based platforms
ARM: dts: imx: fix clocks for cspi
ARM i.MX6q: fix for ldb_di_sels
Pull MIPS fixes from Ralf Baechle:
"MIPS fixes across the field. The only area that's standing out is the
exception handling which received it's dose of breakage as part of the
microMIPS patchset"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: ralink: add missing SZ_1M multiplier
MIPS: Compat: Fix cputime_to_timeval() arguments in compat binfmt_elf.
MIPS: OCTEON: Improve _machine_halt implementation.
MIPS: rtlx: Fix implicit declaration of function set_vi_handler()
MIPS: Trap exception handling fixes
MIPS: Quit exposing Kconfig symbols in uapi headers.
MIPS: Remove duplicate definition of check_for_high_segbits.
Pull m68knommu fix from Greg Ungerer:
"A single fix for compilation breakage to many of the ColdFire CPU
targets"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu:
m68k: only use local gpio_request_one if not using GPIOLIB
- One device tree fix for all spi node to have per clock added.
The clock is needed by spi driver to calculate bit rate divisor.
The spi node in the current device trees either does not have the
clock or is defined as dummy clock, in which case the driver probe
will fail or spi will run at a wrong bit rate.
- Two imx6q clock fixes, which correct axi_sels and ldb_di_sels.
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Merge tag 'imx-fixes-3.10-2' of git://git.linaro.org/people/shawnguo/linux-2.6 into fixes
From Shawn Guo, imx fixes for 3.10, take 2:
- One device tree fix for all spi node to have per clock added.
The clock is needed by spi driver to calculate bit rate divisor.
The spi node in the current device trees either does not have the
clock or is defined as dummy clock, in which case the driver probe
will fail or spi will run at a wrong bit rate.
- Two imx6q clock fixes, which correct axi_sels and ldb_di_sels.
* tag 'imx-fixes-3.10-2' of git://git.linaro.org/people/shawnguo/linux-2.6:
ARM: imx: clk-imx6q: AXI clock select index is incorrect
ARM: dts: imx: fix clocks for cspi
ARM i.MX6q: fix for ldb_di_sels
Signed-off-by: Olof Johansson <olof@lixom.net>
If the early MMU mapping of the UART happens to get booted out of the
TLB between the start of paging_init() and when we finally re-add the
UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if
we've got early_printk enabled. Avoid this hang by calling
debug_ll_io_init() early.
Without this patch, you can reliably reproduce a hang when early
printk is enabled by adding flush_tlb_all() at the start of
exynos_init_io(). After this patch the hang goes away.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
* Correction to USB OVC and PENC pin groupings on r8a7779 SoC.
This avoids conflicts when the USB_OVCn pins are used by another function.
This has been observed to be a problem in v3.10-rc1.
* Update CMT clock rating for sh73a0 SoC to resolve boot failure
on kzm9g-reference. This resolves a regression between v3.9 and v3.10-rc1.
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Merge tag 'renesas-fixes-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes
From Simon Horman, Renesas ARM based SoC fixes for v3.10:
- Correction to USB OVC and PENC pin groupings on r8a7779 SoC.
This avoids conflicts when the USB_OVCn pins are used by another function.
This has been observed to be a problem in v3.10-rc1.
- Update CMT clock rating for sh73a0 SoC to resolve boot failure
on kzm9g-reference. This resolves a regression between v3.9 and v3.10-rc1.
* tag 'renesas-fixes-for-v3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
ARM: shmobile: sh73a0: Update CMT clockevent rating to 80
sh-pfc: r8a7779: Don't group USB OVC and PENC pins
Signed-off-by: Olof Johansson <olof@lixom.net>
Printing low-level debug messages make an assumption that the specified
UART port has been preconfigured by the bootloader. Incorrectly
specified UART port results in system getting stalled while printing the
message "Uncompressing Linux... done, booting the kernel"
This UART port number is specified through S3C_LOWLEVEL_UART_PORT. Since
the UART port might different for different board, it is not possible to
specify it correctly for every board that use a common defconfig file.
Calling this print subroutine only when DEBUG_LL fixes the problem. By
disabling DEBUG_LL in default config file, we would be able to boot
multiple boards with different default UART ports.
With this current approach, we miss the print "Uncompressing Linux...
done, booting the kernel." when DEBUG_LL is not defined.
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Also fixes some CCF-related breakage on OMAP36xx/37xx, affecting DSS
at the very least.
Basic test logs for this branch are here:
http://www.pwsan.com/omap/testlogs/fixes_b_v3.10-rc/20130606093449/
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Merge tag 'omap-fixes-b-for-3.10-rc' of git://git.kernel.org/pub/scm/linux/kernel/git/pjw/omap-pending into omap-for-v3.10/fixes
More OMAP hwmod and clock fixes for v3.10-rc. Fixes the AM33xx UART2.
Also fixes some CCF-related breakage on OMAP36xx/37xx, affecting DSS
at the very least.
Basic test logs for this branch are here:
http://www.pwsan.com/omap/testlogs/fixes_b_v3.10-rc/20130606093449/
PCI ROM from EFI
x86/PCI: Map PCI setup data with ioremap() so it can be in highmem
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Merge tag 'pci-v3.10-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI fixes from Bjorn Helgaas:
"This fixes a crash when booting a 32-bit kernel via the EFI boot stub.
PCI ROM from EFI
x86/PCI: Map PCI setup data with ioremap() so it can be in highmem"
* tag 'pci-v3.10-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
x86/PCI: Map PCI setup data with ioremap() so it can be in highmem
The ranges DT entry needed by the PCIe controller is defined at the
SoC .dtsi level. However, some boards have a NOR flash, and to support
it, they need to override the SoC-level ranges property to add an
additional range. Since PCIe and NOR support came separately, some
boards were not properly changed to include the PCIe range in their
ranges property at the .dts level.
This commit fixes those platforms.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Linus Torvalds