linux-toradex.git/arch/powerpc/include, branch v3.19.7

powerpc: Re-enable dynticks

2015-04-19T08:10:16+00:00

commit fea559f303567e558bfab9c8ba4a2af5b309205a upstream.

Implement arch_irq_work_has_interrupt() for powerpc

Commit 9b01f5bf3 introduced a dependency on "IRQ work self-IPIs" for
full dynamic ticks to be enabled, by expecting architectures to
implement a suitable arch_irq_work_has_interrupt() routine.

Several arches have implemented this routine, including x86 (3010279f)
and arm (09f6edd4), but powerpc was omitted.

This patch implements this routine for powerpc.

The symptom, at boot (on powerpc systems) with "nohz_full="
is displayed:

     NO_HZ: Can't run full dynticks because arch doesn't support irq work self-IPIs

after this patch:

     NO_HZ: Full dynticks CPUs: .

Tested against 3.19.

powerpc implements "IRQ work self-IPIs" by setting the decrementer to 1 in
arch_irq_work_raise(), which causes a decrementer exception on the next
timebase tick. We then handle the work in __timer_interrupt().

CC: Frederic Weisbecker 
Signed-off-by: Paul A. Clarke 
Reviewed-by: Paul E. McKenney 
[mpe: Flesh out change log, fix ws & include guards, remove include of processor.h]
Signed-off-by: Michael Ellerman 
Signed-off-by: Greg Kroah-Hartman

powerpc: fix memory corruption by pnv_alloc_idle_core_states

2015-04-19T08:10:16+00:00

commit d52356e7f48e400ca258c6763a232a92fa82ff68 upstream.

Space allocated for paca is based off nr_cpu_ids,
but pnv_alloc_idle_core_states() iterates paca with
cpu_nr_cores()*threads_per_core, which is using NR_CPUS.

This causes pnv_alloc_idle_core_states() to write over memory,
which is outside of paca array and may later lead to various panics.

Fixes: 7cba160ad789 (powernv/cpuidle: Redesign idle states management)
Signed-off-by: Jan Stancek 
Signed-off-by: Michael Ellerman 
Signed-off-by: Preet U. Murthy 
Signed-off-by: Greg Kroah-Hartman

powerpc/iommu: Remove IOMMU device references via bus notifier

2015-03-26T12:59:48+00:00

commit 4ad04e5987115ece5fa8a0cf1dc72fcd4707e33e upstream.

After d905c5df9aef ("PPC: POWERNV: move iommu_add_device earlier"), the
refcnt on the kobject backing the IOMMU group for a PCI device is
elevated by each call to pci_dma_dev_setup_pSeriesLP() (via
set_iommu_table_base_and_group). When we go to dlpar a multi-function
PCI device out:

        iommu_reconfig_notifier ->
                iommu_free_table ->
                        iommu_group_put
                        BUG_ON(tbl->it_group)

We trip this BUG_ON, because there are still references on the table, so
it is not freed. Fix this by moving the powernv bus notifier to common
code and calling it for both powernv and pseries.

Fixes: d905c5df9aef ("PPC: POWERNV: move iommu_add_device earlier")
Signed-off-by: Nishanth Aravamudan 
Tested-by: Nishanth Aravamudan 
Signed-off-by: Michael Ellerman 
Signed-off-by: Greg Kroah-Hartman

cxl: Fix device_node reference counting

2015-03-18T13:11:12+00:00

commit 6f963ec2d6bf2476a16799eece920acb2100ff1c upstream.

When unbinding and rebinding the driver on a system with a card in PHB0, this
error condition is reached after a few attempts:

ERROR: Bad of_node_put() on /pciex@3fffe40000000
CPU: 0 PID: 3040 Comm: bash Not tainted 3.18.0-rc3-12545-g3627ffe #152
Call Trace:
[c000000721acb5c0] [c00000000086ef94] .dump_stack+0x84/0xb0 (unreliable)
[c000000721acb640] [c00000000073a0a8] .of_node_release+0xd8/0xe0
[c000000721acb6d0] [c00000000044bc44] .kobject_release+0x74/0xe0
[c000000721acb760] [c0000000007394fc] .of_node_put+0x1c/0x30
[c000000721acb7d0] [c000000000545cd8] .cxl_probe+0x1a98/0x1d50
[c000000721acb900] [c0000000004845a0] .local_pci_probe+0x40/0xc0
[c000000721acb980] [c000000000484998] .pci_device_probe+0x128/0x170
[c000000721acba30] [c00000000052400c] .driver_probe_device+0xac/0x2a0
[c000000721acbad0] [c000000000522468] .bind_store+0x108/0x160
[c000000721acbb70] [c000000000521448] .drv_attr_store+0x38/0x60
[c000000721acbbe0] [c000000000293840] .sysfs_kf_write+0x60/0xa0
[c000000721acbc50] [c000000000292500] .kernfs_fop_write+0x140/0x1d0
[c000000721acbcf0] [c000000000208648] .vfs_write+0xd8/0x260
[c000000721acbd90] [c000000000208b18] .SyS_write+0x58/0x100
[c000000721acbe30] [c000000000009258] syscall_exit+0x0/0x98

We are missing a call to of_node_get(). pnv_pci_to_phb_node() should
call of_node_get() otherwise np's reference count isn't incremented and
it might go away. Rename pnv_pci_to_phb_node() to pnv_pci_get_phb_node()
so it's clear it calls of_node_get().

Signed-off-by: Ryan Grimm 
Acked-by: Ian Munsie 
Signed-off-by: Michael Ellerman 
Signed-off-by: Greg Kroah-Hartman

mm/debug_pagealloc: fix build failure on ppc and some other archs

2015-02-05T21:35:30+00:00

Kim Phillips reported following build failure.

  LD      init/built-in.o
  mm/built-in.o: In function `free_pages_prepare':
  mm/page_alloc.c:770: undefined reference to `.kernel_map_pages'
  mm/built-in.o: In function `prep_new_page':
  mm/page_alloc.c:933: undefined reference to `.kernel_map_pages'
  mm/built-in.o: In function `map_pages':
  mm/compaction.c:61: undefined reference to `.kernel_map_pages'
  make: *** [vmlinux] Error 1

Reason for this problem is that commit 031bc5743f15
("mm/debug-pagealloc: make debug-pagealloc boottime configurable")
forgot to remove the old declaration of kernel_map_pages() for some
architectures.  This patch removes them to fix build failure.

Reported-by: Kim Phillips 
Signed-off-by: Joonsoo Kim 
Cc: Heiko Carstens 
Cc: Martin Schwidefsky 
Cc: David Miller 
Cc: David Howells 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

powerpc: Work around gcc bug in current_thread_info()

2015-01-12T05:40:02+00:00

In commit a3e5b356b3ab "powerpc: Don't use local named register variable
in current_thread_info" Anton changed the way we did current_thread_info()
to accommodate LLVM, and it was not meant to have any effect elsewhere.

Unfortunately it has exposed a gcc bug, where r1 gets copied into
another register and then gcc uses that register to restore the toc
after a function call, even when that register is volatile and has been
clobbered by the function call.

We could revert Anton's patch, but it's not clear the original code is
safe either, we may just have been lucky.

The cleanest solution is to just use the existing CURRENT_THREAD_INFO()
asm macro, and call it using inline asm.

Segher points out we don't need volatile on the asm, if the result of
the shift is unused it's fine for the compiler to elide it.

Fixes: a3e5b356b3ab ("powerpc: Don't use local named register variable in current_thread_info")
Reported-by: Alexander Graf 
Signed-off-by: Michael Ellerman

powerpc/kdump: Ignore failure in enabling big endian exception during crash

2014-12-29T04:44:53+00:00

In LE kernel, we currently have a hack for kexec that resets the exception
endian before starting a new kernel as the kernel that is loaded could be a
big endian or a little endian kernel. In kdump case, resetting exception
endian fails when one or more cpus is disabled. But we can ignore the failure
and still go ahead, as in most cases crashkernel will be of same endianess
as primary kernel and reseting endianess is not even needed in those cases.
This patch adds a new inline function to say if this is kdump path. This
function is used at places where such a check is needed.

Signed-off-by: Hari Bathini 
[mpe: Rename to kdump_in_progress(), use bool, and edit comment]
Signed-off-by: Michael Ellerman

powerpc: Wire up sys_execveat() syscall

2014-12-29T04:44:53+00:00

Wire up sys_execveat(). This passes the selftests for the system call.

Check success of execveat(3, '../execveat', 0)... [OK]
Check success of execveat(5, 'execveat', 0)... [OK]
Check success of execveat(6, 'execveat', 0)... [OK]
Check success of execveat(-100, '/home/pranith/linux/...ftests/exec/execveat', 0)... [OK]
Check success of execveat(99, '/home/pranith/linux/...ftests/exec/execveat', 0)... [OK]
Check success of execveat(8, '', 4096)... [OK]
Check success of execveat(17, '', 4096)... [OK]
Check success of execveat(9, '', 4096)... [OK]
Check success of execveat(14, '', 4096)... [OK]
Check success of execveat(14, '', 4096)... [OK]
Check success of execveat(15, '', 4096)... [OK]
Check failure of execveat(8, '', 0) with ENOENT... [OK]
Check failure of execveat(8, '(null)', 4096) with EFAULT... [OK]
Check success of execveat(5, 'execveat.symlink', 0)... [OK]
Check success of execveat(6, 'execveat.symlink', 0)... [OK]
Check success of execveat(-100, '/home/pranith/linux/...xec/execveat.symlink', 0)... [OK]
Check success of execveat(10, '', 4096)... [OK]
Check success of execveat(10, '', 4352)... [OK]
Check failure of execveat(5, 'execveat.symlink', 256) with ELOOP... [OK]
Check failure of execveat(6, 'execveat.symlink', 256) with ELOOP... [OK]
Check failure of execveat(-100, '/home/pranith/linux/tools/testing/selftests/exec/execveat.symlink', 256) with ELOOP... [OK]
Check success of execveat(3, '../script', 0)... [OK]
Check success of execveat(5, 'script', 0)... [OK]
Check success of execveat(6, 'script', 0)... [OK]
Check success of execveat(-100, '/home/pranith/linux/...elftests/exec/script', 0)... [OK]
Check success of execveat(13, '', 4096)... [OK]
Check success of execveat(13, '', 4352)... [OK]
Check failure of execveat(18, '', 4096) with ENOENT... [OK]
Check failure of execveat(7, 'script', 0) with ENOENT... [OK]
Check success of execveat(16, '', 4096)... [OK]
Check success of execveat(16, '', 4096)... [OK]
Check success of execveat(4, '../script', 0)... [OK]
Check success of execveat(4, 'script', 0)... [OK]
Check success of execveat(4, '../script', 0)... [OK]
Check failure of execveat(4, 'script', 0) with ENOENT... [OK]
Check failure of execveat(5, 'execveat', 65535) with EINVAL... [OK]
Check failure of execveat(5, 'no-such-file', 0) with ENOENT... [OK]
Check failure of execveat(6, 'no-such-file', 0) with ENOENT... [OK]
Check failure of execveat(-100, 'no-such-file', 0) with ENOENT... [OK]
Check failure of execveat(5, '', 4096) with EACCES... [OK]
Check failure of execveat(5, 'Makefile', 0) with EACCES... [OK]
Check failure of execveat(11, '', 4096) with EACCES... [OK]
Check failure of execveat(12, '', 4096) with EACCES... [OK]
Check failure of execveat(99, '', 4096) with EBADF... [OK]
Check failure of execveat(99, 'execveat', 0) with EBADF... [OK]
Check failure of execveat(8, 'execveat', 0) with ENOTDIR... [OK]
Invoke copy of 'execveat' via filename of length 4093:
Check success of execveat(19, '', 4096)... [OK]
Check success of execveat(5, 'xxxxxxxxxxxxxxxxxxxx...yyyyyyyyyyyyyyyyyyyy', 0)... [OK]
Invoke copy of 'script' via filename of length 4093:
Check success of execveat(20, '', 4096)... [OK]
/bin/sh: 0: Can't open /dev/fd/5/xxxxxxx(... a long line of x's and y's, 0)... [OK]
Check success of execveat(5, 'xxxxxxxxxxxxxxxxxxxx...yyyyyyyyyyyyyyyyyyyy', 0)... [OK]

Tested on a 32-bit powerpc system.

Signed-off-by: Pranith Kumar 
Signed-off-by: Michael Ellerman

Merge tag 'powerpc-3.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux

2014-12-19T20:57:45+00:00

Pull second batch of powerpc updates from Michael Ellerman:
 "The highlight is the series that reworks the idle management on
  powernv, which allows us to use deeper idle states on those machines.

  There's the fix from Anton for the "BUG at kernel/smpboot.c:134!"
  problem.

  An i2c driver for powernv.  This is acked by Wolfram Sang, and he
  asked that we take it through the powerpc tree.

  A fix for audit from rgb at Red Hat, acked by Paul Moore who is one of
  the audit maintainers.

  A patch from Ben to export the symbol map of our OPAL firmware as a
  sysfs file, so that tools can use it.

  Also some CXL fixes, a couple of powerpc perf fixes, a fix for
  smt-enabled, and the patch to add __force to get_user() so we can use
  bitwise types"

* tag 'powerpc-3.19-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
  powerpc/powernv: Ignore smt-enabled on Power8 and later
  powerpc/uaccess: Allow get_user() with bitwise types
  powerpc/powernv: Expose OPAL firmware symbol map
  powernv/powerpc: Add winkle support for offline cpus
  powernv/cpuidle: Redesign idle states management
  powerpc/powernv: Enable Offline CPUs to enter deep idle states
  powerpc/powernv: Switch off MMU before entering nap/sleep/rvwinkle mode
  i2c: Driver to expose PowerNV platform i2c busses
  powerpc: add little endian flag to syscall_get_arch()
  power/perf/hv-24x7: Use kmem_cache_free() instead of kfree
  powerpc/perf/hv-24x7: Use per-cpu page buffer
  cxl: Unmap MMIO regions when detaching a context
  cxl: Add timeout to process element commands
  cxl: Change contexts_lock to a mutex to fix sleep while atomic bug
  powerpc: Secondary CPUs must set cpu_callin_map after setting active and online

Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

2014-12-19T00:05:28+00:00

Pull KVM update from Paolo Bonzini:
 "3.19 changes for KVM:

   - spring cleaning: removed support for IA64, and for hardware-
     assisted virtualization on the PPC970

   - ARM, PPC, s390 all had only small fixes

  For x86:
   - small performance improvements (though only on weird guests)
   - usual round of hardware-compliancy fixes from Nadav
   - APICv fixes
   - XSAVES support for hosts and guests.  XSAVES hosts were broken
     because the (non-KVM) XSAVES patches inadvertently changed the KVM
     userspace ABI whenever XSAVES was enabled; hence, this part is
     going to stable.  Guest support is just a matter of exposing the
     feature and CPUID leaves support"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (179 commits)
  KVM: move APIC types to arch/x86/
  KVM: PPC: Book3S: Enable in-kernel XICS emulation by default
  KVM: PPC: Book3S HV: Improve H_CONFER implementation
  KVM: PPC: Book3S HV: Fix endianness of instruction obtained from HEIR register
  KVM: PPC: Book3S HV: Remove code for PPC970 processors
  KVM: PPC: Book3S HV: Tracepoints for KVM HV guest interactions
  KVM: PPC: Book3S HV: Simplify locking around stolen time calculations
  arch: powerpc: kvm: book3s_paired_singles.c: Remove unused function
  arch: powerpc: kvm: book3s_pr.c: Remove unused function
  arch: powerpc: kvm: book3s.c: Remove some unused functions
  arch: powerpc: kvm: book3s_32_mmu.c: Remove unused function
  KVM: PPC: Book3S HV: Check wait conditions before sleeping in kvmppc_vcore_blocked
  KVM: PPC: Book3S HV: ptes are big endian
  KVM: PPC: Book3S HV: Fix inaccuracies in ICP emulation for H_IPI
  KVM: PPC: Book3S HV: Fix KSM memory corruption
  KVM: PPC: Book3S HV: Fix an issue where guest is paused on receiving HMI
  KVM: PPC: Book3S HV: Fix computation of tlbie operand
  KVM: PPC: Book3S HV: Add missing HPTE unlock
  KVM: PPC: BookE: Improve irq inject tracepoint
  arm/arm64: KVM: Require in-kernel vgic for the arch timers
  ...