cascardo/linux.git
8 years agoarm64: locks: patch in lse instructions when supported by the CPU
Will Deacon [Tue, 10 Feb 2015 03:03:15 +0000 (03:03 +0000)]
arm64: locks: patch in lse instructions when supported by the CPU

On CPUs which support the LSE atomic instructions introduced in ARMv8.1,
it makes sense to use them in preference to ll/sc sequences.

This patch introduces runtime patching of our locking functions so that
LSE atomic instructions are used for spinlocks and rwlocks.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: atomics: patch in lse instructions when supported by the CPU
Will Deacon [Tue, 3 Feb 2015 16:14:13 +0000 (16:14 +0000)]
arm64: atomics: patch in lse instructions when supported by the CPU

On CPUs which support the LSE atomic instructions introduced in ARMv8.1,
it makes sense to use them in preference to ll/sc sequences.

This patch introduces runtime patching of atomic_t and atomic64_t
routines so that the call-site for the out-of-line ll/sc sequences is
patched with an LSE atomic instruction when we detect that
the CPU supports it.

If binutils is not recent enough to assemble the LSE instructions, then
the ll/sc sequences are inlined as though CONFIG_ARM64_LSE_ATOMICS=n.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: introduce CONFIG_ARM64_LSE_ATOMICS as fallback to ll/sc atomics
Will Deacon [Tue, 3 Feb 2015 12:39:03 +0000 (12:39 +0000)]
arm64: introduce CONFIG_ARM64_LSE_ATOMICS as fallback to ll/sc atomics

In order to patch in the new atomic instructions at runtime, we need to
generate wrappers around the out-of-line exclusive load/store atomics.

This patch adds a new Kconfig option, CONFIG_ARM64_LSE_ATOMICS. which
causes our atomic functions to branch to the out-of-line ll/sc
implementations. To avoid the register spill overhead of the PCS, the
out-of-line functions are compiled with specific compiler flags to
force out-of-line save/restore of any registers that are usually
caller-saved.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: alternatives: add cpu feature for lse atomics
Will Deacon [Wed, 4 Feb 2015 12:17:55 +0000 (12:17 +0000)]
arm64: alternatives: add cpu feature for lse atomics

Add a CPU feature for the LSE atomic instructions, so that they can be
patched in at runtime when we detect that they are supported.

Reviewed-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: elf: advertise 8.1 atomic instructions as new hwcap
Will Deacon [Mon, 26 Jan 2015 18:46:19 +0000 (18:46 +0000)]
arm64: elf: advertise 8.1 atomic instructions as new hwcap

The ARM v8.1 architecture introduces new atomic instructions to the A64
instruction set for things like cmpxchg, so advertise their availability
to userspace using a hwcap.

Reviewed-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: atomics: move ll/sc atomics into separate header file
Will Deacon [Tue, 3 Feb 2015 11:26:53 +0000 (11:26 +0000)]
arm64: atomics: move ll/sc atomics into separate header file

In preparation for the Large System Extension (LSE) atomic instructions
introduced by ARM v8.1, move the current exclusive load/store (LL/SC)
atomics into their own header file.

Reviewed-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: cpufeature.h: add missing #include of kernel.h
Will Deacon [Thu, 30 Apr 2015 17:55:50 +0000 (18:55 +0100)]
arm64: cpufeature.h: add missing #include of kernel.h

cpufeature.h makes use of DECLARE_BITMAP, which in turn relies on the
BITS_TO_LONGS and DIV_ROUND_UP macros.

This patch includes kernel.h in cpufeature.h to prevent all users having
to do the same thing.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: rwlocks: don't fail trylock purely due to contention
Will Deacon [Wed, 22 Jul 2015 17:25:52 +0000 (18:25 +0100)]
arm64: rwlocks: don't fail trylock purely due to contention

STXR can fail for a number of reasons, so don't fail an rwlock trylock
operation simply because the STXR reported failure.

I'm not aware of any issues with the current code, but this makes it
consistent with spin_trylock and also other architectures (e.g. arch/arm).

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoMerge branch 'locking/arch-atomic' of git://git.kernel.org/pub/scm/linux/kernel/git...
Will Deacon [Mon, 27 Jul 2015 13:21:15 +0000 (14:21 +0100)]
Merge branch 'locking/arch-atomic' of git://git./linux/kernel/git/tip/tip into aarch64/for-next/core

Merge in PeterZ's logical atomic ops so that we can implement them in
our subsequent LSE atomics.

8 years agoatomic: Add simple atomic_t tests
Peter Zijlstra [Mon, 13 Jul 2015 10:55:58 +0000 (12:55 +0200)]
atomic: Add simple atomic_t tests

Add a few atomic_t tests, gets some compile coverage for the new
operations.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoatomic: Replace atomic_{set,clear}_mask() usage
Peter Zijlstra [Thu, 23 Apr 2015 23:12:32 +0000 (01:12 +0200)]
atomic: Replace atomic_{set,clear}_mask() usage

Replace the deprecated atomic_{set,clear}_mask() usage with the now
ubiquous atomic_{or,andnot}() functions.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoatomic: Collapse all atomic_{set,clear}_mask definitions
Peter Zijlstra [Thu, 23 Apr 2015 23:12:32 +0000 (01:12 +0200)]
atomic: Collapse all atomic_{set,clear}_mask definitions

Move the now generic definitions of atomic_{set,clear}_mask() into
linux/atomic.h to avoid endless and pointless repetition.

Also, provide an atomic_andnot() wrapper for those few archs that can
implement that.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoatomic: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:32:50 +0000 (19:32 +0200)]
atomic: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agotile: Provide atomic_{or,xor,and}
Chris Metcalf [Thu, 9 Jul 2015 20:38:17 +0000 (16:38 -0400)]
tile: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

For tilegx, these are relatively straightforward; the architecture
provides atomic "or" and "and", both 32-bit and 64-bit.  To support
xor we provide a loop using "cmpexch".

For the older 32-bit tilepro architecture, we have to extend
the set of low-level assembly routines to include 32-bit "and",
as well as all three 64-bit routines.  Somewhat confusingly,
some 32-bit versions are already used by the bitops inlines, with
parameter types appropriate for bitops, so we have to do a bit of
casting to match "int" to "unsigned long".

Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1436474297-32187-1-git-send-email-cmetcalf@ezchip.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoh8300: Provide atomic_{or,xor,and}
Peter Zijlstra [Fri, 10 Jul 2015 10:55:45 +0000 (12:55 +0200)]
h8300: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Also rework the atomic implementation in terms of CPP macros to avoid
the typical repetition -- I seem to have missed this arch the last
time around when I did that.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agofrv: Rewrite atomic implementation
Peter Zijlstra [Thu, 23 Apr 2015 22:49:20 +0000 (00:49 +0200)]
frv: Rewrite atomic implementation

Mostly complete rewrite of the FRV atomic implementation, instead of
using assembly files, use inline assembler.

The out-of-line CONFIG option makes a bit of a mess of things, but a
little CPP trickery gets that done too.

FRV already had the atomic logic ops but under a non standard name,
the reimplementation provides the generic names and provides the
intermediate form required for the bitops implementation.

The slightly inconsistent __atomic32_fetch_##op naming is because
__atomic_fetch_##op conlicts with GCC builtin functions.

The 64bit atomic ops use the inline assembly %Ln construct to access
the low word register (r+1), afaik this construct was not previously
used in the kernel and is completely undocumented, but I found it in
the FRV GCC code and it seems to work.

FRV had a non-standard definition of atomic_{clear,set}_mask() which
would work types other than atomic_t, the one user relying on that
(arch/frv/kernel/dma.c) got converted to use the new intermediate
form.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agox86: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:28:37 +0000 (20:28 +0200)]
x86: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agos390: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:15:48 +0000 (20:15 +0200)]
s390: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoxtensa: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:35:00 +0000 (19:35 +0200)]
xtensa: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agosparc: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:40:25 +0000 (19:40 +0200)]
sparc: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agosh: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:44:20 +0000 (19:44 +0200)]
sh: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agopowerpc: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:46:23 +0000 (19:46 +0200)]
powerpc: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoparisc: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:47:25 +0000 (19:47 +0200)]
parisc: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agomn10300: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:50:20 +0000 (19:50 +0200)]
mn10300: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agomips: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:51:36 +0000 (19:51 +0200)]
mips: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agometag: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:53:39 +0000 (19:53 +0200)]
metag: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agom68k: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:56:20 +0000 (19:56 +0200)]
m68k: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agom32r: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 17:57:49 +0000 (19:57 +0200)]
m32r: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoia64: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:00:01 +0000 (20:00 +0200)]
ia64: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agohexagon: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:00:54 +0000 (20:00 +0200)]
hexagon: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoblackfin: Provide atomic_{or,xor,and}
Peter Zijlstra [Thu, 23 Apr 2015 19:44:42 +0000 (21:44 +0200)]
blackfin: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

TODO: use inline asm or at least asm macros to collapse the lot.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoavr32: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:02:20 +0000 (20:02 +0200)]
avr32: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoarm64: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:03:13 +0000 (20:03 +0200)]
arm64: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoarm: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:04:39 +0000 (20:04 +0200)]
arm: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoarc: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:06:20 +0000 (20:06 +0200)]
arc: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Acked-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoalpha: Provide atomic_{or,xor,and}
Peter Zijlstra [Wed, 23 Apr 2014 18:07:47 +0000 (20:07 +0200)]
alpha: Provide atomic_{or,xor,and}

Implement atomic logic ops -- atomic_{or,xor,and}.

These will replace the atomic_{set,clear}_mask functions that are
available on some archs.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoatomic: Prepare generic atomic implementation for logic ops
Peter Zijlstra [Wed, 15 Jul 2015 13:47:25 +0000 (15:47 +0200)]
atomic: Prepare generic atomic implementation for logic ops

Clean up the #ifdef guards a bit to prepare for architectures to
supply their own logic ops.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoarm64: include linux/types.h in asm/spinlock_types.h
Will Deacon [Mon, 27 Jul 2015 10:07:03 +0000 (11:07 +0100)]
arm64: include linux/types.h in asm/spinlock_types.h

Our ticket-based spinlock structures rely on a definition of u16, so
include linux/types.h explicitly to ensure the thing compiles.

Found by a module build failure in -next:

  arch/arm64/include/asm/spinlock_types.h:27:2: error: unknown type name 'u16'
  arch/arm64/include/asm/spinlock_types.h:28:2: error: unknown type name 'u16'
  arch/arm64/include/asm/spinlock_types.h:33:13: error: expected declaration specifiers or '...' before numeric constant
  include/linux/spinlock_types.h:21:2: error: unknown type name 'arch_spinlock_t'
  arch/arm64/include/asm/spinlock.h:34:35: error: unknown type name 'arch_spinlock_t'
  arch/arm64/include/asm/spinlock.h:65:37: error: unknown type name 'arch_spinlock_t'

Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/BUG: Show explicit backtrace for WARNs
Dave P Martin [Fri, 24 Jul 2015 15:37:49 +0000 (16:37 +0100)]
arm64/BUG: Show explicit backtrace for WARNs

The generic slowpath WARN implementation prints a backtrace, but
the report_bug() based implementation does not, opting to print the
registers instead which is generally not as useful.

Ideally, report_bug() should be fixed to make the behaviour more
consistent, but in the meantime this patch generates a backtrace
directly from the arm64 backend instead so that this functionality
is not lost with the migration to report_bug().

As a side-effect, the backtrace will be outside the oops end
marker, but that's hard to avoid without modifying generic code.

This patch can go away if report_bug() grows the ability in the
future to generate a backtrace directly or call an arch hook at the
appropriate time.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/BUG: Use BRK instruction for generic BUG traps
Dave P Martin [Fri, 24 Jul 2015 15:37:48 +0000 (16:37 +0100)]
arm64/BUG: Use BRK instruction for generic BUG traps

Currently, the minimal default BUG() implementation from asm-
generic is used for arm64.

This patch uses the BRK software breakpoint instruction to generate
a trap instead, similarly to most other arches, with the generic
BUG code generating the dmesg boilerplate.

This allows bug metadata to be moved to a separate table and
reduces the amount of inline code at BUG and WARN sites.  This also
avoids clobbering any registers before they can be dumped.

To mitigate the size of the bug table further, this patch makes
use of the existing infrastructure for encoding addresses within
the bug table as 32-bit offsets instead of absolute pointers.
(Note that this limits the kernel size to 2GB.)

Traps are registered at arch_initcall time for aarch64, but BUG
has minimal real dependencies and it is desirable to be able to
generate bug splats as early as possible.  This patch redirects
all debug exceptions caused by BRK directly to bug_handler() until
the full debug exception support has been initialised.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/debug: Add missing #includes
Dave P Martin [Fri, 24 Jul 2015 15:37:47 +0000 (16:37 +0100)]
arm64/debug: Add missing #includes

<asm/debug-monitors.h> relies on <asm/ptrace.h>, but doesn't
declare this dependency.  This becomes a problem once
debug-monitors.h starts getting included all over the place to get
the BRK immedates.

The missing include of <asm/memory.h> (for UL()) in <asm/esr.h> is
also added.  The series no longer relies on this, but I spotted it
during development and it may as well get fixed.

No functional change.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/debug: Simplify BRK insn opcode declarations
Dave P Martin [Fri, 24 Jul 2015 15:37:46 +0000 (16:37 +0100)]
arm64/debug: Simplify BRK insn opcode declarations

The way the KGDB_DYN_BRK_INS_BYTEx macros are declared is more
complex than it needs to be.  Also, the macros are only used in one
place, which is arch-specific anyway.

This patch refactors the macros to simplify them, and exposes an
argument so that we can have a single macro instead of 4.

As a side effect, this patch also fixes some anomalous spellings of
"KGDB".

These changes alter the compile types of some integer constants
that are harmless but trigger truncation warnings in gcc when
assigning to 32-bit variables.  This patch adds an explicit cast
for the affected cases.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/debug: Move BRK ESR template macro into <asm/esr.h>
Dave P Martin [Fri, 24 Jul 2015 15:37:45 +0000 (16:37 +0100)]
arm64/debug: Move BRK ESR template macro into <asm/esr.h>

It makes sense to keep all the architectural exception syndrome
definitions in the same place.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/debug: More consistent naming for the BRK ESR template macro
Dave P Martin [Fri, 24 Jul 2015 15:37:44 +0000 (16:37 +0100)]
arm64/debug: More consistent naming for the BRK ESR template macro

The naming of DBG_ESR_VAL_BRK is inconsistent with the way other
similar macros are named.

This patch makes the naming more consistent, and appends "64"
as a reminder that this ESR pattern only matches from AArch64
state.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/debug: Eliminate magic number from ESR template definition
Dave P Martin [Fri, 24 Jul 2015 15:37:43 +0000 (16:37 +0100)]
arm64/debug: Eliminate magic number from ESR template definition

<asm/esr.h> has perfectly good constants for defining ESR values
already.  Let's use them.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/debug: Mask off all reserved bits from generated ESR values
Dave P Martin [Fri, 24 Jul 2015 15:37:42 +0000 (16:37 +0100)]
arm64/debug: Mask off all reserved bits from generated ESR values

There are only 16 comment bits in a BRK instruction, which
correspond to ESR bits 15:0.  Bits 24:16 of the ESR are RES0,
and might have weird meanings in the future.

This code inserts 16 bits of comment in the ESR value instead of
20 (almost certainly a typo in the original code).

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64/debug: Eliminate magic number for size of BRK instruction
Dave P Martin [Fri, 24 Jul 2015 15:37:41 +0000 (16:37 +0100)]
arm64/debug: Eliminate magic number for size of BRK instruction

The size of an A64 BRK instruction is the same as the size of all other
A64 instructions, because all A64 instructions are the same size.

BREAK_INSTR_SIZE is retained for readibility, but it should not be
an independent constant from AARCH64_INSN_SIZE.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: insn: use set_fixmap_offset to make it more clear
yalin wang [Fri, 24 Jul 2015 11:52:28 +0000 (12:52 +0100)]
arm64: insn: use set_fixmap_offset to make it more clear

A little change to patch_map() function,
use set_fixmap_offset() to make code more clear.

Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: efi: prefer AllocatePages() over efi_low_alloc() for vmlinux
Ard Biesheuvel [Fri, 24 Jul 2015 11:38:27 +0000 (12:38 +0100)]
arm64: efi: prefer AllocatePages() over efi_low_alloc() for vmlinux

When allocating memory for the kernel image, try the AllocatePages()
boot service to obtain memory at the preferred offset of
'dram_base + TEXT_OFFSET', and only revert to efi_low_alloc() if that
fails. This is the only way to allocate at the base of DRAM if DRAM
starts at 0x0, since efi_low_alloc() refuses to allocate at 0x0.

Tested-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kernel: remove non-legit DT warnings when booting using ACPI
Sudeep Holla [Thu, 23 Jul 2015 17:28:26 +0000 (18:28 +0100)]
arm64: kernel: remove non-legit DT warnings when booting using ACPI

Since both CONFIG_ACPI and CONFIG_OF are enabled when booting using ACPI
tables on ARM64 platforms, we get few device tree warnings which are not
valid for ACPI boot. We can use of_have_populated_dt to check if the
device tree is populated or not before throwing out those errors.

This patch uses of_have_populated_dt to remove non legitimate device
tree warning when booting using ACPI tables.

Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: alternatives: add enable parameter to conditional asm macros
Will Deacon [Thu, 23 Jul 2015 12:51:46 +0000 (13:51 +0100)]
arm64: alternatives: add enable parameter to conditional asm macros

There are cases where we want to compile out both versions of an
alternative code block, so add an enable parameter to the new conditional
alternative assembly macros in the same way as alternative_insn.

Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kernel: Add support for Privileged Access Never
James Morse [Wed, 22 Jul 2015 18:05:54 +0000 (19:05 +0100)]
arm64: kernel: Add support for Privileged Access Never

'Privileged Access Never' is a new arm8.1 feature which prevents
privileged code from accessing any virtual address where read or write
access is also permitted at EL0.

This patch enables the PAN feature on all CPUs, and modifies {get,put}_user
helpers temporarily to permit access.

This will catch kernel bugs where user memory is accessed directly.
'Unprivileged loads and stores' using ldtrb et al are unaffected by PAN.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
[will: use ALTERNATIVE in asm and tidy up pan_enable check]
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: Generalise msr_s/mrs_s operations
Suzuki K. Poulose [Wed, 22 Jul 2015 10:38:14 +0000 (11:38 +0100)]
arm64: Generalise msr_s/mrs_s operations

The system register encoding generated by sys_reg() works only
for MRS/MSR(Register) operations, as we hardcode Bit20 to 1 in
mrs_s/msr_s mask. This makes it unusable for generating instructions
accessing registers with Op0 < 2(e.g, PSTATE.x with Op0=0).

As per ARMv8 ARM, (Ref: ARMv8 ARM, Section: "System instruction class
encoding overview", C5.2, version:ARM DDI 0487A.f), the instruction
encoding reserves bits [20-19] for Op0.

This patch generalises the sys_reg, mrs_s and msr_s macros, so that
we could use them to access any of the supported system register.

Cc: James Morse <james.morse@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kernel: Add optional CONFIG_ parameter to ALTERNATIVE()
James Morse [Tue, 21 Jul 2015 12:23:30 +0000 (13:23 +0100)]
arm64: kernel: Add optional CONFIG_ parameter to ALTERNATIVE()

Some uses of ALTERNATIVE() may depend on a feature that is disabled at
compile time by a Kconfig option. In this case the unused alternative
instructions waste space, and if the original instruction is a nop, it
wastes time and space.

This patch adds an optional 'config' option to ALTERNATIVE() and
alternative_insn that allows the compiler to remove both the original
and alternative instructions if the config option is not defined.

Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kernel: Add min_field_value and use '>=' for feature detection
James Morse [Tue, 21 Jul 2015 12:23:29 +0000 (13:23 +0100)]
arm64: kernel: Add min_field_value and use '>=' for feature detection

When a new cpu feature is available, the cpu feature bits will have some
initial value, which is incremented when the feature is updated.
This patch changes 'register_value' to be 'min_field_value', and checks
the feature bits value (interpreted as a signed int) is greater than this
minimum.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kernel: Add cpufeature 'enable' callback
James Morse [Tue, 21 Jul 2015 12:23:28 +0000 (13:23 +0100)]
arm64: kernel: Add cpufeature 'enable' callback

This patch adds an 'enable()' callback to cpu capability/feature
detection, allowing features that require some setup or configuration
to get this opportunity once the feature has been detected.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kernel: Move config_sctlr_el1
James Morse [Tue, 21 Jul 2015 12:23:27 +0000 (13:23 +0100)]
arm64: kernel: Move config_sctlr_el1

Later patches need config_sctlr_el1 to set/clear bits in the sctlr_el1
register.

This patch moves this function into header a file.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kvm: Adopt new alternative assembler macros
Daniel Thompson [Wed, 22 Jul 2015 11:21:04 +0000 (12:21 +0100)]
arm64: kvm: Adopt new alternative assembler macros

Convert the dynamic patching for ARM64_HAS_SYSREG_GIC_CPUIF over to
the newly added alternative assembler macros.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kernel: Adopt new alternative assembler macros
Daniel Thompson [Wed, 22 Jul 2015 11:21:03 +0000 (12:21 +0100)]
arm64: kernel: Adopt new alternative assembler macros

Convert the dynamic patching for ARM64_WORKAROUND_845719 over to
the newly added alternative assembler macros.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: mm: Adopt new alternative assembler macros
Daniel Thompson [Wed, 22 Jul 2015 11:21:02 +0000 (12:21 +0100)]
arm64: mm: Adopt new alternative assembler macros

Convert the dynamic patching for ARM64_WORKAROUND_CLEAN_CACHE over to
the newly added alternative assembler macros.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: alternative: Provide if/else/endif assembler macros
Daniel Thompson [Wed, 22 Jul 2015 11:21:01 +0000 (12:21 +0100)]
arm64: alternative: Provide if/else/endif assembler macros

The existing alternative_insn macro has some limitations that make it
hard to work with. In particular the fact it takes instructions from it
own macro arguments means it doesn't play very nicely with C pre-processor
macros because the macro arguments look like a string to the C
pre-processor. Workarounds are (probably) possible but things start to
look ugly.

Introduce an alternative set of macros that allows instructions to be
presented to the assembler as normal and switch everything over to the
new macros.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: kernel: Add cpuid_feature_extract_field() for 4bit sign extension
James Morse [Tue, 21 Jul 2015 12:23:26 +0000 (13:23 +0100)]
arm64: kernel: Add cpuid_feature_extract_field() for 4bit sign extension

Based on arch/arm/include/asm/cputype.h, this function does the
shifting and sign extension necessary when accessing cpu feature fields.

Signed-off-by: James Morse <james.morse@arm.com>
Suggested-by: Russell King <linux@arm.linux.org.uk>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: perf: condense event number maps
Mark Rutland [Tue, 21 Jul 2015 10:36:39 +0000 (11:36 +0100)]
arm64: perf: condense event number maps

Most of the cache events an architecture might support do not map well
to those provided by the ARM architecture, and as such most entries in
the event number maps are *_UNSUPPORTED. Unfortuantely as 0 is a valid
physical event identifier, the *_UNSUPPORTED macros expand to a non-zero
value and thus each unsupported event must be explicitly initialised as
such. This leads to large diffs when adding support for a new CPU, and
makes it difficult to spot the important information.

This patch follows arch/arm/ in making use of PERF_*_ALL_UNSUPPORTED
macros to initialise all entries to *_UNSUPPORTED before overriding this
for the specific events we actually support, resulting in a significant
source code reduction.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: hugetlb: remove paragraph about writing to FSF
Jisheng Zhang [Tue, 21 Jul 2015 14:43:58 +0000 (15:43 +0100)]
arm64: hugetlb: remove paragraph about writing to FSF

Remove paragraph about writing to the Free Software Foundation's
mailing address from GPL notice.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: dma-mapping: implement dma_get_sgtable()
Robin Murphy [Fri, 17 Jul 2015 15:58:21 +0000 (16:58 +0100)]
arm64: dma-mapping: implement dma_get_sgtable()

The default dma_common_get_sgtable() implementation relies on the CPU
address of the buffer being a regular lowmem address. This is not always
the case on arm64, since allocations from the various DMA pools may have
remapped vmalloc addresses, rendering the use of virt_to_page() invalid.

Fix this by providing our own implementation based on the fact that we
can safely derive a physical address from the DMA address in both cases.

CC: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[will: made static]
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: force CONFIG_SMP=y and remove redundant #ifdefs
Will Deacon [Fri, 29 May 2015 17:28:44 +0000 (18:28 +0100)]
arm64: force CONFIG_SMP=y and remove redundant #ifdefs

Nobody seems to be producing !SMP systems anymore, so this is just
becoming a source of kernel bugs, particularly if people want to use
coherent DMA with non-shared pages.

This patch forces CONFIG_SMP=y for arm64, removing a modest amount of
code in the process.

Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: perf: factor out callchain code
Mark Rutland [Mon, 6 Jul 2015 11:23:54 +0000 (12:23 +0100)]
arm64: perf: factor out callchain code

We currently bundle the callchain handling code with the PMU code,
despite the fact the two are distinct, and the former can be useful even
in the absence of the latter.

Follow the example of arch/arm and factor the callchain handling into
its own file dependent on CONFIG_PERF_EVENTS rather than
CONFIG_HW_PERF_EVENTS.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: lib: use pair accessors for copy_*_user routines
Will Deacon [Tue, 2 Jun 2015 14:18:38 +0000 (15:18 +0100)]
arm64: lib: use pair accessors for copy_*_user routines

The AArch64 instruction set contains load/store pair memory accessors,
so use these in our copy_*_user routines to transfer 16 bytes per
iteration.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: Better native ptrace support for compat tasks
Catalin Marinas [Tue, 14 Jul 2015 15:20:17 +0000 (16:20 +0100)]
arm64: Better native ptrace support for compat tasks

The compat ptrace interface allows access to the TLS register, hardware
breakpoints and watchpoints, syscall number. However, a native task
using the native ptrace interface to debug compat tasks (e.g. multi-arch
gdb) only has access to the general and VFP register sets. The compat
ptrace interface cannot be accessed from a native task.

This patch adds a new user_aarch32_ptrace_view which contains the TLS,
hardware breakpoint/watchpoint and syscall number regsets in addition to
the existing GPR and VFP regsets. This view is backwards compatible with
the previous kernels. Core dumping of 32-bit tasks and compat ptrace are
not affected since the original user_aarch32_view is preserved.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Yao Qi <yao.qi@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: enable more compressed Image formats
Olof Johansson [Thu, 16 Jul 2015 20:26:16 +0000 (21:26 +0100)]
arm64: enable more compressed Image formats

Plumb up Makefile arguments for the already supported formats in the kbuild
system: lz4, bzip2, lzma, and lzo.

Note that just as with Image.gz, these images are not self-decompressing and
the booting firmware still needs to handle decompression before launching the
kernel image.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: Add support for hardware updates of the access and dirty pte bits
Catalin Marinas [Fri, 10 Jul 2015 16:24:28 +0000 (17:24 +0100)]
arm64: Add support for hardware updates of the access and dirty pte bits

The ARMv8.1 architecture extensions introduce support for hardware
updates of the access and dirty information in page table entries. With
TCR_EL1.HA enabled, when the CPU accesses an address with the PTE_AF bit
cleared in the page table, instead of raising an access flag fault the
CPU sets the actual page table entry bit. To ensure that kernel
modifications to the page tables do not inadvertently revert a change
introduced by hardware updates, the exclusive monitor (ldxr/stxr) is
adopted in the pte accessors.

When TCR_EL1.HD is enabled, a write access to a memory location with the
DBM (Dirty Bit Management) bit set in the corresponding pte
automatically clears the read-only bit (AP[2]). Such DBM bit maps onto
the Linux PTE_WRITE bit and to check whether a writable (DBM set) page
is dirty, the kernel tests the PTE_RDONLY bit. In order to allow
read-only and dirty pages, the kernel needs to preserve the software
dirty bit. The hardware dirty status is transferred to the software
dirty bit in ptep_set_wrprotect() (using load/store exclusive loop) and
pte_modify().

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: remove dead code
Mark Salter [Thu, 16 Jul 2015 17:58:53 +0000 (18:58 +0100)]
arm64: remove dead code

Commit 68234df4ea79 ("arm64: kill flush_cache_all()") removed
soft_reset() from the kernel. This was the only caller of
setup_mm_for_reboot(), so remove that also.

Signed-off-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: move update_mmu_cache() into asm/pgtable.h
Will Deacon [Thu, 16 Jul 2015 18:26:02 +0000 (19:26 +0100)]
arm64: move update_mmu_cache() into asm/pgtable.h

Mark Brown reported an allnoconfig build failure in -next:

  Today's linux-next fails to build an arm64 allnoconfig due to "mm:
  make GUP handle pfn mapping unless FOLL_GET is requested" which
  causes:

  >       arm64-allnoconfig
  > ../mm/gup.c:51:4: error: implicit declaration of function
    'update_mmu_cache' [-Werror=implicit-function-declaration]

Fix the error by moving the function to asm/pgtable.h, as is the case
for most other architectures.

Reported-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: consolidate __swiotlb_mmap
Robin Murphy [Fri, 10 Jul 2015 15:47:56 +0000 (16:47 +0100)]
arm64: consolidate __swiotlb_mmap

Since commit 9d3bfbb4df58 ("arm64: Combine coherent and non-coherent
swiotlb dma_ops"), __dma_common_mmap is no longer shared between two
callers, so roll it into the remaining one.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: Remove unused macros from assembler.h
Daniel Thompson [Fri, 10 Jul 2015 13:58:00 +0000 (14:58 +0100)]
arm64: Remove unused macros from assembler.h

Commit 68234df4ea79 ("arm64: kill flush_cache_all()") removed the
only users of these macros.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: modify the dump mem for 64 bit addresses
Rohit Thapliyal [Fri, 10 Jul 2015 08:23:59 +0000 (09:23 +0100)]
arm64: modify the dump mem for 64 bit addresses

On 64bit kernel, the dump_mem gives 32 bit addresses
on the stack dump. This gives unorganized information regarding
the 64bit values on the stack. Hence, modified to get a complete 64bit memory
dump.

With patch:
[   93.534801] Process insmod (pid: 1587, stack limit = 0xffffffc976be4058)
[   93.541441] Stack: (0xffffffc976be7cf0 to 0xffffffc976be8000)
[   93.547136] 7ce0:                                   ffffffc976be7d00 ffffffc00008163c
[   93.554898] 7d00: ffffffc976be7d40 ffffffc0000f8a44 ffffffc00098ef38 ffffffbffc000088
[   93.562659] 7d20: ffffffc00098ef50 ffffffbffc0000c0 0000000000000001 ffffffbffc000070
[   93.570419] 7d40: ffffffc976be7e40 ffffffc0000f935c 0000000000000000 000000002b424090
[   93.578179] 7d60: 000000002b424010 0000007facc555f4 0000000080000000 0000000000000015
[   93.585937] 7d80: 0000000000000116 0000000000000069 ffffffc00097b000 ffffffc976be4000
[   93.593694] 7da0: 0000000000000064 0000000000000072 000000000000006e 000000000000003f
[   93.601453] 7dc0: 000000000000feff 000000000000fff1 ffffffbffc002028 0000000000000124
[   93.609211] 7de0: ffffffc976be7e10 0000000000000001 ffffff8000000000 ffffffbbffff0000
[   93.616969] 7e00: ffffffc976be7e60 0000000000000000 0000000000000000 0000000000000000
[   93.624726] 7e20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[   93.632484] 7e40: 0000007fcc474550 ffffffc0000841ec 000000002b424010 0000007facda0710
[   93.640241] 7e60: ffffffffffffffff ffffffc0000be6dc ffffff80007d2000 000000000001c010
[   93.647999] 7e80: ffffff80007e0ae0 ffffff80007e09d0 ffffff80007edf70 0000000000000288
[   93.655757] 7ea0: 00000000000002e8 0000000000000000 0000000000000000 0000001c0000001b
[   93.663514] 7ec0: 0000000000000009 0000000000000007 000000002b424090 000000000001c010
[   93.671272] 7ee0: 000000002b424010 0000007faccd3a48 0000000000000000 0000000000000000
[   93.679030] 7f00: 0000007fcc4743f8 0000007fcc4743f8 0000000000000069 0000000000000003
[   93.686787] 7f20: 0101010101010101 0000000000000004 0000000000000020 00000000000003f3
[   93.694544] 7f40: 0000007facb95664 0000007facda7030 0000007facc555d0 0000000000498378
[   93.702301] 7f60: 0000000000000000 000000002b424010 0000007facda0710 000000002b424090
[   93.710058] 7f80: 0000007fcc474698 0000000000498000 0000007fcc474ebb 0000000000474f58
[   93.717815] 7fa0: 0000000000498000 0000000000000000 0000000000000000 0000007fcc474550
[   93.725573] 7fc0: 00000000004104bc 0000007fcc474430 0000007facc555f4 0000000080000000
[   93.733330] 7fe0: 000000002b424090 0000000000000069 0950020128000244 4104000008000004
[   93.741084] Call trace:

The above output makes a debugger life a lot more easier.

Signed-off-by: Rohit Thapliyal <r.thapliyal@samsung.com>
Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: perf: replace arch_find_n_match_cpu_physical_id with of_cpu_device_node_get
Sudeep Holla [Tue, 30 Jun 2015 12:56:56 +0000 (13:56 +0100)]
arm64: perf: replace arch_find_n_match_cpu_physical_id with of_cpu_device_node_get

arch_find_n_match_cpu_physical_id parses the device tree to get the
device node for a given logical cpu index. However, since ARM PMUs get
probed after the CPU device nodes are stashed while registering the
cpus, we can use of_cpu_device_node_get to avoid another DT parse.

This patch replaces arch_find_n_match_cpu_physical_id with
of_cpu_device_node_get to reuse the stashed value directly instead.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoarm64: perf: Remove unnecessary printk
Suzuki K. Poulose [Fri, 12 Jun 2015 14:39:28 +0000 (15:39 +0100)]
arm64: perf: Remove unnecessary printk

ARM64 pmu prints an error message in event_init() when
no hardware PMU is available. This is pretty annoying as
it keeps printing the message for every single trial, flooding
the kernel logs, unnecessarily. The return code is sufficient for
the user to figure out the reason.

Signed-off-by: Suzuki K. Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
8 years agoLinux 4.2-rc4 v4.2-rc4
Linus Torvalds [Sun, 26 Jul 2015 19:26:21 +0000 (12:26 -0700)]
Linux 4.2-rc4

8 years agoMerge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 26 Jul 2015 18:46:32 +0000 (11:46 -0700)]
Merge branch 'perf-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull perf fix from Thomas Gleixner:
 "A single fix for the intel cqm perf facility to prevent IPIs from
  interrupt context"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/cqm: Return cached counter value from IRQ context

8 years agoMerge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
Linus Torvalds [Sun, 26 Jul 2015 18:14:04 +0000 (11:14 -0700)]
Merge branch 'x86-urgent-for-linus' of git://git./linux/kernel/git/tip/tip

Pull x86 fixes from Thomas Gleixner:
 "This update contains:

   - the manual revert of the SYSCALL32 changes which caused a
     regression

   - a fix for the MPX vma handling

   - three fixes for the ioremap 'is ram' checks.

   - PAT warning fixes

   - a trivial fix for the size calculation of TLB tracepoints

   - handle old EFI structures gracefully

  This also contains a PAT fix from Jan plus a revert thereof.  Toshi
  explained why the code is correct"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm/pat: Revert 'Adjust default caching mode translation tables'
  x86/asm/entry/32: Revert 'Do not use R9 in SYSCALL32' commit
  x86/mm: Fix newly introduced printk format warnings
  mm: Fix bugs in region_is_ram()
  x86/mm: Remove region_is_ram() call from ioremap
  x86/mm: Move warning from __ioremap_check_ram() to the call site
  x86/mm/pat, drivers/media/ivtv: Move the PAT warning and replace WARN() with pr_warn()
  x86/mm/pat, drivers/infiniband/ipath: Replace WARN() with pr_warn()
  x86/mm/pat: Adjust default caching mode translation tables
  x86/fpu: Disable dependent CPU features on "noxsave"
  x86/mpx: Do not set ->vm_ops on MPX VMAs
  x86/mm: Add parenthesis for TLB tracepoint size calculation
  efi: Handle memory error structures produced based on old versions of standard

8 years agox86/mm/pat: Revert 'Adjust default caching mode translation tables'
Thomas Gleixner [Sun, 26 Jul 2015 08:27:37 +0000 (10:27 +0200)]
x86/mm/pat: Revert 'Adjust default caching mode translation tables'

Toshi explains:

"No, the default values need to be set to the fallback types,
 i.e. minimal supported mode.  For WC and WT, UC is the fallback type.

 When PAT is disabled, pat_init() does update the tables below to
 enable WT per the default BIOS setup.  However, when PAT is enabled,
 but CPU has PAT -errata, WT falls back to UC per the default values."

Revert: ca1fec58bc6a 'x86/mm/pat: Adjust default caching mode translation tables'
Requested-by: Toshi Kani <toshi.kani@hp.com>
Cc: Jan Beulich <jbeulich@suse.de>
Link: http://lkml.kernel.org/r/1437577776.3214.252.camel@hp.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoperf/x86/intel/cqm: Return cached counter value from IRQ context
Matt Fleming [Tue, 21 Jul 2015 14:55:09 +0000 (15:55 +0100)]
perf/x86/intel/cqm: Return cached counter value from IRQ context

Peter reported the following potential crash which I was able to
reproduce with his test program,

[  148.765788] ------------[ cut here ]------------
[  148.765796] WARNING: CPU: 34 PID: 2840 at kernel/smp.c:417 smp_call_function_many+0xb6/0x260()
[  148.765797] Modules linked in:
[  148.765800] CPU: 34 PID: 2840 Comm: perf Not tainted 4.2.0-rc1+ #4
[  148.765803]  ffffffff81cdc398 ffff88085f105950 ffffffff818bdfd5 0000000000000007
[  148.765805]  0000000000000000 ffff88085f105990 ffffffff810e413a 0000000000000000
[  148.765807]  ffffffff82301080 0000000000000022 ffffffff8107f640 ffffffff8107f640
[  148.765809] Call Trace:
[  148.765810]  <NMI>  [<ffffffff818bdfd5>] dump_stack+0x45/0x57
[  148.765818]  [<ffffffff810e413a>] warn_slowpath_common+0x8a/0xc0
[  148.765822]  [<ffffffff8107f640>] ? intel_cqm_stable+0x60/0x60
[  148.765824]  [<ffffffff8107f640>] ? intel_cqm_stable+0x60/0x60
[  148.765825]  [<ffffffff810e422a>] warn_slowpath_null+0x1a/0x20
[  148.765827]  [<ffffffff811613f6>] smp_call_function_many+0xb6/0x260
[  148.765829]  [<ffffffff8107f640>] ? intel_cqm_stable+0x60/0x60
[  148.765831]  [<ffffffff81161748>] on_each_cpu_mask+0x28/0x60
[  148.765832]  [<ffffffff8107f6ef>] intel_cqm_event_count+0x7f/0xe0
[  148.765836]  [<ffffffff811cdd35>] perf_output_read+0x2a5/0x400
[  148.765839]  [<ffffffff811d2e5a>] perf_output_sample+0x31a/0x590
[  148.765840]  [<ffffffff811d333d>] ? perf_prepare_sample+0x26d/0x380
[  148.765841]  [<ffffffff811d3497>] perf_event_output+0x47/0x60
[  148.765843]  [<ffffffff811d36c5>] __perf_event_overflow+0x215/0x240
[  148.765844]  [<ffffffff811d4124>] perf_event_overflow+0x14/0x20
[  148.765847]  [<ffffffff8107e7f4>] intel_pmu_handle_irq+0x1d4/0x440
[  148.765849]  [<ffffffff811d07a6>] ? __perf_event_task_sched_in+0x36/0xa0
[  148.765853]  [<ffffffff81219bad>] ? vunmap_page_range+0x19d/0x2f0
[  148.765854]  [<ffffffff81219d11>] ? unmap_kernel_range_noflush+0x11/0x20
[  148.765859]  [<ffffffff814ce6fe>] ? ghes_copy_tofrom_phys+0x11e/0x2a0
[  148.765863]  [<ffffffff8109e5db>] ? native_apic_msr_write+0x2b/0x30
[  148.765865]  [<ffffffff8109e44d>] ? x2apic_send_IPI_self+0x1d/0x20
[  148.765869]  [<ffffffff81065135>] ? arch_irq_work_raise+0x35/0x40
[  148.765872]  [<ffffffff811c8d86>] ? irq_work_queue+0x66/0x80
[  148.765875]  [<ffffffff81075306>] perf_event_nmi_handler+0x26/0x40
[  148.765877]  [<ffffffff81063ed9>] nmi_handle+0x79/0x100
[  148.765879]  [<ffffffff81064422>] default_do_nmi+0x42/0x100
[  148.765880]  [<ffffffff81064563>] do_nmi+0x83/0xb0
[  148.765884]  [<ffffffff818c7c0f>] end_repeat_nmi+0x1e/0x2e
[  148.765886]  [<ffffffff811d07a6>] ? __perf_event_task_sched_in+0x36/0xa0
[  148.765888]  [<ffffffff811d07a6>] ? __perf_event_task_sched_in+0x36/0xa0
[  148.765890]  [<ffffffff811d07a6>] ? __perf_event_task_sched_in+0x36/0xa0
[  148.765891]  <<EOE>>  [<ffffffff8110ab66>] finish_task_switch+0x156/0x210
[  148.765898]  [<ffffffff818c1671>] __schedule+0x341/0x920
[  148.765899]  [<ffffffff818c1c87>] schedule+0x37/0x80
[  148.765903]  [<ffffffff810ae1af>] ? do_page_fault+0x2f/0x80
[  148.765905]  [<ffffffff818c1f4a>] schedule_user+0x1a/0x50
[  148.765907]  [<ffffffff818c666c>] retint_careful+0x14/0x32
[  148.765908] ---[ end trace e33ff2be78e14901 ]---

The CQM task events are not safe to be called from within interrupt
context because they require performing an IPI to read the counter value
on all sockets. And performing IPIs from within IRQ context is a
"no-no".

Make do with the last read counter value currently event in
event->count when we're invoked in this context.

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vikas Shivappa <vikas.shivappa@intel.com>
Cc: Kanaka Juvva <kanaka.d.juvva@intel.com>
Cc: Will Auld <will.auld@intel.com>
Cc: <stable@vger.kernel.org>
Link: http://lkml.kernel.org/r/1437490509-15373-1-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
8 years agoMerge tag 'usb-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Linus Torvalds [Sun, 26 Jul 2015 03:11:12 +0000 (20:11 -0700)]
Merge tag 'usb-4.2-rc4' of git://git./linux/kernel/git/gregkh/usb

Pull USB fixes from Greg KH:
 "Here's a few USB and PHY fixes for 4.2-rc4.

  Nothing major, the shortlog has the full details.

  All of these have been in linux-next successfully"

* tag 'usb-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (21 commits)
  USB: OHCI: fix bad #define in ohci-tmio.c
  cdc-acm: Destroy acm_minors IDR on module exit
  usb-storage: Add ignore-device quirk for gm12u320 based usb mini projectors
  usb-storage: ignore ZTE MF 823 card reader in mode 0x1225
  USB: OHCI: Fix race between ED unlink and URB submission
  usb: core: lpm: set lpm_capable for root hub device
  xhci: do not report PLC when link is in internal resume state
  xhci: prevent bus_suspend if SS port resuming in phase 1
  xhci: report U3 when link is in resume state
  xhci: Calculate old endpoints correctly on device reset
  usb: xhci: Bugfix for NULL pointer deference in xhci_endpoint_init() function
  xhci: Workaround to get D3 working in Intel xHCI
  xhci: call BIOS workaround to enable runtime suspend on Intel Braswell
  usb: dwc3: Reset the transfer resource index on SET_INTERFACE
  usb: gadget: udc: core: Fix argument of dma_map_single for IOMMU
  usb: gadget: mv_udc_core: fix phy_regs I/O memory leak
  usb: ulpi: ulpi_init should be executed in subsys_initcall
  phy: berlin-usb: fix divider for BG2
  phy: berlin-usb: fix divider for BG2CD
  phy/pxa: add HAS_IOMEM dependency
  ...

8 years agoMerge tag 'tty-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Linus Torvalds [Sun, 26 Jul 2015 03:05:07 +0000 (20:05 -0700)]
Merge tag 'tty-4.2-rc4' of git://git./linux/kernel/git/gregkh/tty

Pull tty/serial driver fixes from Greg KH:
 "Here are a number of small serial and tty fixes for reported issues.

  All have been in linux-next successfully"

* tag 'tty-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: vt: Fix !TASK_RUNNING diagnostic warning from paste_selection()
  serial: core: Fix crashes while echoing when closing
  m32r: Add ioreadXX/iowriteXX big-endian mmio accessors
  Revert "serial: imx: initialized DMA w/o HW flow enabled"
  sc16is7xx: fix FIFO address of secondary UART
  sc16is7xx: fix Kconfig dependencies
  serial: etraxfs-uart: Fix release etraxfs_uart_ports
  tty/vt: Fix the memory leak in visual_init
  serial: amba-pl011: Fix devm_ioremap_resource return value check
  n_tty: signal and flush atomically

8 years agoMerge tag 'staging-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sun, 26 Jul 2015 03:03:10 +0000 (20:03 -0700)]
Merge tag 'staging-4.2-rc4' of git://git./linux/kernel/git/gregkh/staging

Pull staging driver fixes from Greg KH:
 "Here are a number of iio and staging driver fixes for reported issues
  for 4.2-rc4.

  All have been in linux-next for a while with no problems"

* tag 'staging-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (34 commits)
  iio:light:stk3310: make endianness independent of host
  iio:light:stk3310: move device register to end of probe
  iio: mma8452: use iio event type IIO_EV_TYPE_MAG
  iio: mcp320x: Fix NULL pointer dereference
  iio: adc: vf610: fix the adc register read fail issue
  iio: mlx96014: Replace offset sign
  iio: magnetometer: mmc35240: fix SET/RESET sequence
  iio: magnetometer: mmc35240: Fix SET/RESET mask
  iio: magnetometer: mmc35240: Fix crash in pm suspend
  iio:magnetometer:bmc150_magn: output intended variable
  iio:magnetometer:bmc150_magn: add regmap dependency
  staging: vt6656: check ieee80211_bss_conf bssid not NULL
  staging: vt6655: check ieee80211_bss_conf bssid not NULL
  iio: tmp006: Check channel info on write
  iio: sx9500: Add missing init in sx9500_buffer_pre{en,dis}able()
  iio:light:ltr501: fix regmap dependency
  iio:light:ltr501: fix variable in ltr501_init
  iio: sx9500: fix bug in compensation code
  iio: sx9500: rework error handling of raw readings
  iio: magnetometer: mmc35240: fix available sampling frequencies
  ...

8 years agoMerge tag 'char-misc-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
Linus Torvalds [Sun, 26 Jul 2015 02:50:59 +0000 (19:50 -0700)]
Merge tag 'char-misc-4.2-rc4' of git://git./linux/kernel/git/gregkh/char-misc

Pull char/misc driver fixes from Greg KH:
 "Here are some char and misc driver fixes for reported issues.

  One parport patch is reverted as it was incorrect, thanks to testing
  by the 0-day bot"

* tag 'char-misc-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  parport: Revert "parport: fix memory leak"
  mei: prevent unloading mei hw modules while the device is opened.
  misc: mic: scif bug fix for vmalloc_to_page crash
  parport: fix freeing freed memory
  parport: fix memory leak
  parport: fix error handling

8 years agoparport: Revert "parport: fix memory leak"
Sudip Mukherjee [Sat, 25 Jul 2015 07:49:40 +0000 (13:19 +0530)]
parport: Revert "parport: fix memory leak"

This reverts commit 23c405912b88 ("parport: fix memory leak")

par_dev->state was already being removed in parport_unregister_device().

Reported-by: Ying Huang <ying.huang@intel.com>
Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8 years agoMerge tag 'trace-v4.2-rc2-fix3' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Sat, 25 Jul 2015 18:42:54 +0000 (11:42 -0700)]
Merge tag 'trace-v4.2-rc2-fix3' of git://git./linux/kernel/git/rostedt/linux-trace

Pull ftrace fix from Steven Rostedt:
 "Back in 3.16 the ftrace code was redesigned and cleaned up to remove
  the double iteration list (one for registered ftrace ops, and one for
  registered "global" ops), to just use one list.  That simplified the
  code but also broke the function tracing filtering on pid.

  This updates the code to handle the filtering again with the new
  logic"

* tag 'trace-v4.2-rc2-fix3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Fix breakage of set_ftrace_pid

8 years agoMerge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw...
Linus Torvalds [Sat, 25 Jul 2015 18:36:12 +0000 (11:36 -0700)]
Merge branch 'libnvdimm-fixes' of git://git./linux/kernel/git/djbw/nvdimm

Pull libnvdimm fix from Dan Williams:
 "A minor fix for the libnvdimm subsystem.

  This is not critical.  The problem can be worked around in userspace
  by putting the namespace temporarily into raw mode
  (ndctl_namespace_set_raw_mode() from libndctl), but that is awkward
  for management utilities.

* 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm:
  libnvdimm: fix namespace seed creation

8 years agoMerge tag 'md/4.2-fixes' of git://neil.brown.name/md
Linus Torvalds [Sat, 25 Jul 2015 18:24:58 +0000 (11:24 -0700)]
Merge tag 'md/4.2-fixes' of git://neil.brown.name/md

Pull md fixes from Neil Brown:
 "Some md fixes for 4.2

  Several are tagged for -stable.
  A few aren't because they are not very, serious or because they are in
  the 'experimental' cluster code"

* tag 'md/4.2-fixes' of git://neil.brown.name/md:
  md/raid5: clear R5_NeedReplace when no longer needed.
  Fix read-balancing during node failure
  md-cluster: fix bitmap sub-offset in bitmap_read_sb
  md: Return error if request_module fails and returns positive value
  md: Skip cluster setup in case of error while reading bitmap
  md/raid1: fix test for 'was read error from last working device'.
  md: Skip cluster setup for dm-raid
  md: flush ->event_work before stopping array.
  md/raid10: always set reshape_safe when initializing reshape_position.
  md/raid5: avoid races when changing cache size.

8 years agoMerge tag 'for-linus-20150724' of git://git.infradead.org/linux-mtd
Linus Torvalds [Sat, 25 Jul 2015 18:19:38 +0000 (11:19 -0700)]
Merge tag 'for-linus-20150724' of git://git.infradead.org/linux-mtd

Pull MTD fixes from Brian Norris:
 "Two trivial updates.  I meant to send these much earlier, but I've
  been preoccupied.

   - Add MAINTAINERS entry for diskonchip g3 driver

   - Fix an overlooked conflict in bitfield value assignments

  The latter update is a bit overdue, but there's no reason to wait any
  longer"

* tag 'for-linus-20150724' of git://git.infradead.org/linux-mtd:
  mtd: nand: Fix NAND_USE_BOUNCE_BUFFER flag conflict
  MAINTAINERS: mtd: docg3: add docg3 maintainer

8 years agolibnvdimm: fix namespace seed creation
Dan Williams [Sat, 25 Jul 2015 03:42:34 +0000 (23:42 -0400)]
libnvdimm: fix namespace seed creation

A new BLK namespace "seed" device is created whenever the current seed
is successfully probed.  However, if that namespace is assigned to a BTT
it may never directly experience a successful probe as it is a
subordinate device to a BTT configuration.

The effect of the current code is that no new namespaces can be
instantiated, after the seed namespace, to consume available BLK DPA
capacity.  Fix this by treating a successful BTT probe event as a
successful probe event for the backing namespace.

Reported-by: Nicholas Moulin <nicholas.w.moulin@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
8 years agoMerge branch 'for-linus' of git://git.kernel.dk/linux-block
Linus Torvalds [Sat, 25 Jul 2015 00:00:04 +0000 (17:00 -0700)]
Merge branch 'for-linus' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Four smaller fixes for the current series.  This contains:

   - A fix for clones of discard bio's, that can cause data corruption.
     From Martin.

   - A fix for null_blk, where in certain queue modes it could access a
     request after it had been freed.  From Mike Krinkin.

   - An error handling leak fix for blkcg, from Tejun.

   - Also from Tejun, export of the functions that a file system needs
     to implement cgroup writeback support"

* 'for-linus' of git://git.kernel.dk/linux-block:
  block: Do a full clone when splitting discard bios
  block: export bio_associate_*() and wbc_account_io()
  blkcg: fix gendisk reference leak in blkg_conf_prep()
  null_blk: fix use-after-free problem

8 years agoMerge branch 'for-4.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
Linus Torvalds [Fri, 24 Jul 2015 23:54:59 +0000 (16:54 -0700)]
Merge branch 'for-4.2-fixes' of git://git./linux/kernel/git/tj/libata

Pull libata fixes from Tejun Heo:
 "A couple important fixes.

   - A block layer change which removed restriction on max transfer size
     led to silent data corruption on some devices.  A new quirk is
     added to restore the old size limit for the reported device.  If it
     gets reported on more devices, we might have to consider restoring
     the restriction for ATA devices by default.

   - There finally is a SSD which is confirmed to cause data corruption
     on TRIM regardless of which flavor is used.  A new quirk is added
     and the device is blacklisted

   - Other device-specific workarounds"

* 'for-4.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
  libata: Do not blacklist M510DC
  libata: increase the timeout when setting transfer mode
  libata: add ATA_HORKAGE_MAX_SEC_1024 to revert back to previous max_sectors limit
  libata: force disable trim for SuperSSpeed S238
  libata: add ATA_HORKAGE_NOTRIM
  libata: add ATA_HORKAGE_BROKEN_FPDMA_AA quirk for HP 250GB SATA disk VB0250EAVER
  ata: pmp: add quirk for Marvell 4140 SATA PMP

8 years agoMerge tag 'mmc-4.2-rc3' of git://git.linaro.org/people/ulf.hansson/mmc
Linus Torvalds [Fri, 24 Jul 2015 23:43:16 +0000 (16:43 -0700)]
Merge tag 'mmc-4.2-rc3' of git://git.linaro.org/people/ulf.hansson/mmc

Pull MMC fixes from Ulf Hansson:
 "Here are some mmc fixes intended for v4.2 rc4.

  Note, most of the changes are for the sdhci-esdhc-imx controller,
  which also required us to modify some related DTS files.  Those
  changes have been acked by the SoC maintainer.

  MMC core:
   - Fix a reference inbalance issue for power_ro_lock_show() sysfs handler

  MMC host:
   - omap_hsmmc: Fix IRQ errorhandling for CD, DTO, and CRC
   - sdhci: Prevent a kernel panic while using DMA
   - mtk-sd: Let it depend on HAS_DMA to prevent build errors
   - sdhci-esdhc: Make 8BIT bus work
   - sdhci-esdhc-imx: Fix some regressions for DT based platforms
   - sdhci-pxav3: Fix a regression for DT based platforms"

* tag 'mmc-4.2-rc3' of git://git.linaro.org/people/ulf.hansson/mmc:
  mmc: sdhci-pxav3: fix platform_data is not initialized
  dts: mmc: fsl-imx-esdhc: remove fsl,cd-controller support
  mmc: sdhci-esdhc-imx: clear f_max in boarddata
  mmc: sdhci-esdhc-imx: remove duplicated dts parsing
  mmc: sdhci: make max-frequency property in device tree work
  mmc: sdhci-esdhc-imx: move all non dt probe code into one function
  mmc: sdhci-esdhc-imx: fix cd regression for dt platform
  dts: imx7: fix sd card gpio polarity specified in device tree
  dts: imx25: fix sd card gpio polarity specified in device tree
  dts: imx6: fix sd card gpio polarity specified in device tree
  dts: imx53: fix sd card gpio polarity specified in device tree
  dts: imx51: fix sd card gpio polarity specified in device tree
  mmc: sdhci-esdhc: Make 8BIT bus work
  mmc: block: Add missing mmc_blk_put() in power_ro_lock_show()
  mmc: MMC_MTK should depend on HAS_DMA
  mmc: sdhci check parameters before call dma_free_coherent
  mmc: omap_hsmmc: Handle BADA, DEB and CEB interrupts
  mmc: omap_hsmmc: Fix DTO and DCRC handling

8 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Linus Torvalds [Fri, 24 Jul 2015 23:33:11 +0000 (16:33 -0700)]
Merge branch 'for-linus' of git://git./linux/kernel/git/dtor/input

Pull input fixes from Dmitry Torokhov:
 "A fix for the warnings/oops when handling HID devices with "unnamed"
  LEDs and couple of other driver fixups""

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: goodix - fix touch coordinates on WinBook TW100 and TW700
  Input: LEDs - skip unnamed LEDs
  Input: usbtouchscreen - avoid unresponsive TSC-30 touch screen
  Input: elantech - force resolution of 31 u/mm
  Input: zforce - don't overwrite the stack

8 years agoMerge tag 'regulator-fix-v4.2-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git...
Linus Torvalds [Fri, 24 Jul 2015 20:14:06 +0000 (13:14 -0700)]
Merge tag 'regulator-fix-v4.2-rc3' of git://git./linux/kernel/git/broonie/regulator

Pull regulator fixes from Mark Brown:
 "As well as some driver specific fixes there's several fixes here for
  the core support for regulators supplying other regulators fixing both
  an issue with ACPI support (which had never been tested before) and
  some error handling and device removal issues that Javier noticed"

* tag 'regulator-fix-v4.2-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
  regulator: core: Fix memory leak in regulator_resolve_supply()
  regulator: core: Increase refcount for regulator supply's module
  regulator: core: Handle full constraints systems when resolving supplies
  regulator: 88pm800: fix LDO vsel_mask value
  regulator: max8973: Fix up control flag option for bias control
  regulator: s2mps11: Fix GPIO suspend enable shift wrapping bug

8 years agoMerge tag 'spi-fix-v4.2-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Linus Torvalds [Fri, 24 Jul 2015 20:13:28 +0000 (13:13 -0700)]
Merge tag 'spi-fix-v4.2-rc3' of git://git./linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown:
 "A small collection of pretty much unremarkable driver specific fixes
  here plus the addition of a new device ID to spidev which requires no
  other code changes"

* tag 'spi-fix-v4.2-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
  spi: imx: Fix small DMA transfers
  spi: zynq: missing break statement
  spi: SPI_ZYNQMP_GQSPI should depend on HAS_DMA
  spi: spidev: add compatible value for LTC2488
  spi: img-spfi: fix support for speeds up to 1/4th input clock

8 years agoMerge tag 'sound-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai...
Linus Torvalds [Fri, 24 Jul 2015 19:50:19 +0000 (12:50 -0700)]
Merge tag 'sound-4.2-rc4' of git://git./linux/kernel/git/tiwai/sound

Pull sound fixes from Takashi Iwai:
 "This has been a calm week again: one minor lockdep fix for PCM core,
  and the most of the rest are HD-audio quirks and fixups for various
  chips and machines"

* tag 'sound-4.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda - Add headset mic pin quirk for a Dell device
  ALSA: hda - remove one pin from ALC292_STANDARD_PINS
  ALSA: hda - Add new GPU codec ID 0x10de007d to snd-hda
  ALSA: hda: add new AMD PCI IDs with proper driver caps
  ALSA: hda - Fix Skylake codec timeout
  ALSA: hda - Add headset mic support for Acer Aspire V5-573G
  ALSA: sparc: Add missing kfree in error path
  ALSA: pcm: Fix lockdep warning with nonatomic PCM ops