linux-toradex.git/arch/mips, branch v3.10.41

MIPS: Hibernate: Flush TLB entries in swsusp_arch_resume()

2014-05-13T11:59:41+00:00

commit c14af233fbe279d0e561ecf84f1208b1bae087ef upstream.

The original MIPS hibernate code flushes cache and TLB entries in
swsusp_arch_resume(). But they are removed in Commit 44eeab67416711
(MIPS: Hibernation: Remove SMP TLB and cacheflushing code.). A cross-
CPU flush is surely unnecessary because all but the local CPU have
already been disabled. But a local flush (at least the TLB flush) is
needed. When we do hibernation on Loongson-3 with an E1000E NIC, it is
very easy to produce a kernel panic (kernel page fault, or unaligned
access). The root cause is E1000E driver use vzalloc_node() to allocate
pages, the stale TLB entries of the booting kernel will be misused by
the resumed target kernel.

Signed-off-by: Huacai Chen 
Cc: John Crispin 
Cc: Steven J. Hill 
Cc: Aurelien Jarno 
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang 
Cc: Zhangjin Wu 
Patchwork: https://patchwork.linux-mips.org/patch/6643/
Signed-off-by: Ralf Baechle 
Signed-off-by: Greg Kroah-Hartman

MIPS: KVM: Pass reserved instruction exceptions to guest

2014-05-13T11:59:41+00:00

commit 15505679362270d02c449626385cb74af8905514 upstream.

Previously a reserved instruction exception while in guest code would
cause a KVM internal error if kvm_mips_handle_ri() didn't recognise the
instruction (including a RDHWR from an unrecognised hardware register).

However the guest OS should really have the opportunity to catch the
exception so that it can take the appropriate actions such as sending a
SIGILL to the guest user process or emulating the instruction itself.

Therefore in these cases emulate a guest RI exception and only return
EMULATE_FAIL if that fails, being careful to revert the PC first in case
the exception occurred in a branch delay slot in which case the PC will
already point to the branch target.

Also turn the printk messages relating to these cases into kvm_debug
messages so that they aren't usually visible.

This allows crashme to run in the guest without killing the entire VM.

Signed-off-by: James Hogan 
Cc: Ralf Baechle 
Cc: Gleb Natapov 
Cc: Paolo Bonzini 
Cc: Sanjay Lal 
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini 
Signed-off-by: Greg Kroah-Hartman

MIPS: include linux/types.h

2014-03-24T04:38:20+00:00

commit 87c99203fea897fbdd84b681ad9fced2517dcf98 upstream.

The file uses u16 type but doesn't include its definition explicitly

I was getting this error when including this header in my driver:

  arch/mips/include/asm/mipsregs.h:644:33: error: unknown type name ‘u16’

Signed-off-by: Qais Yousef 
Reviewed-by: Steven J. Hill 
Acked-by: David Daney 
Signed-off-by: John Crispin 
Patchwork: http://patchwork.linux-mips.org/patch/6212/
Signed-off-by: Greg Kroah-Hartman

MIPS: DMA: For BMIPS5000 cores flush region just like non-coherent R10000

2013-12-20T15:45:06+00:00

commit f86f55d3ad21b21b736bdeb29bee0f0937b77138 upstream.

The BMIPS5000 (Zephyr) processor utilizes instruction speculation. A
stale misprediction address in either the JTB or the CRS may trigger
a prefetch inside a region that is currently being used by a DMA engine,
which is not IO-coherent.  This prefetch will fetch a line into the
scache, and that line will soon become stale (ie wrong) during/after the
DMA.  Mayhem ensues.

In dma-default.c, the r10000 is handled as a special case in the same way
that we want to handle Zephyr.  So we generalize the exception cases into
a function, and include Zephyr as one of the processors that needs this
special care.

Signed-off-by: Jim Quinlan 
Cc: linux-mips@linux-mips.org
Cc: cernekee@gmail.com
Patchwork: https://patchwork.linux-mips.org/patch/5776/
Signed-off-by: Ralf Baechle 
Cc: John Ulvr 
Signed-off-by: Greg Kroah-Hartman

compiler/gcc4: Add quirk for 'asm goto' miscompilation bug

2013-10-18T14:45:45+00:00

commit 3f0116c3238a96bc18ad4b4acefe4e7be32fa861 upstream.

Fengguang Wu, Oleg Nesterov and Peter Zijlstra tracked down
a kernel crash to a GCC bug: GCC miscompiles certain 'asm goto'
constructs, as outlined here:

  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670

Implement a workaround suggested by Jakub Jelinek.

Reported-and-tested-by: Fengguang Wu 
Reported-by: Oleg Nesterov 
Reported-by: Peter Zijlstra 
Suggested-by: Jakub Jelinek 
Reviewed-by: Richard Henderson 
Cc: Linus Torvalds 
Cc: Andrew Morton 
Link: http://lkml.kernel.org/r/20131015062351.GA4666@gmail.com
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

MIPS: ath79: Fix ar933x watchdog clock

2013-09-27T00:18:27+00:00

commit a1191927ace7e6f827132aa9e062779eb3f11fa5 upstream.

The watchdog device on the AR933x is connected to
the AHB clock, however the current code uses the
reference clock. Due to the wrong rate, the watchdog
driver can't calculate correct register values for
a given timeout value and the watchdog unexpectedly
restarts the system.

The code uses the wrong value since the initial
commit 04225e1d227c8e68d685936ecf42ac175fec0e54
(MIPS: ath79: add AR933X specific clock init)

The patch fixes the code to use the correct clock
rate to avoid the problem.

Signed-off-by: Felix Fietkau 
Signed-off-by: Gabor Juhos 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5777/
Signed-off-by: Ralf Baechle 
Signed-off-by: Greg Kroah-Hartman

MIPS: Expose missing pci_io{map,unmap} declarations

2013-08-15T05:59:10+00:00

commit 78857614104a26cdada4c53eea104752042bf5a1 upstream.

The GENERIC_PCI_IOMAP does not depend on CONFIG_PCI so move
it to the CONFIG_MIPS symbol so it's always selected for MIPS.
This fixes the missing pci_iomap declaration for MIPS.
Moreover, the pci_iounmap function was not defined in the
io.h header file if the CONFIG_PCI symbol is not set,
but it should since MIPS is not using CONFIG_GENERIC_IOMAP.

This fixes the following problem on a allyesconfig:

drivers/net/ethernet/3com/3c59x.c:1031:2: error: implicit declaration of
function 'pci_iomap' [-Werror=implicit-function-declaration]
drivers/net/ethernet/3com/3c59x.c:1044:3: error: implicit declaration of
function 'pci_iounmap' [-Werror=implicit-function-declaration]

Signed-off-by: Markos Chandras 
Acked-by: Steven J. Hill 
Patchwork: https://patchwork.linux-mips.org/patch/5478/
Signed-off-by: Ralf Baechle 
Cc: Guenter Roeck 
Signed-off-by: Greg Kroah-Hartman

MIPS: Oceton: Fix build error.

2013-07-28T23:30:07+00:00

commit 39205750efa6d335fac4f9bcd32b49c7e71c12b7 upstream.

If CONFIG_CAVIUM_OCTEON_LOCK_L2_TLB, CONFIG_CAVIUM_OCTEON_LOCK_L2_EXCEPTION,
CONFIG_CAVIUM_OCTEON_LOCK_L2_LOW_LEVEL_INTERRUPT and
CONFIG_CAVIUM_OCTEON_LOCK_L2_INTERRUPT are all undefined:

arch/mips/cavium-octeon/setup.c: In function ‘prom_init’:
arch/mips/cavium-octeon/setup.c:715:12: error: unused variable ‘ebase’ [-Werror=unused-variable]

Signed-off-by: Ralf Baechle 
Signed-off-by: Greg Kroah-Hartman

MIPS: Octeon: Don't clobber bootloader data structures.

2013-07-25T21:07:42+00:00

commit d949b4fe6d23dd92b5fa48cbf7af90ca32beed2e upstream.

Commit abe77f90dc (MIPS: Octeon: Add kexec and kdump support) added a
bootmem region for the kernel image itself.  The problem is that this
is rounded up to a 0x100000 boundary, which is memory that may not be
owned by the kernel.  Depending on the kernel's configuration based
size, this 'extra' memory may contain data passed from the bootloader
to the kernel itself, which if clobbered makes the kernel crash in
various ways.

The fix: Quit rounding the size up, so that we only use memory
assigned to the kernel.

Signed-off-by: David Daney 
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/5449/
Signed-off-by: Ralf Baechle 
Signed-off-by: Greg Kroah-Hartman

Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus

2013-06-12T18:48:14+00:00

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