If there's a simple-framebuffer carried over from boot firmware, it's going
to stop working once we setup the LCDC for use via DRM. Kick it off from
the hardware.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Move the CRTC debugfs files into the CRTC specific directory.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Validate the adjusted mode in the CRTC mode_fixup() call to ensure that
any encoder or bridge doesn't supply us with a mode we can't support.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Improve the Dove (Armada 510) LCD clock selection and divider
calculation, limiting to the valid divisor values, and reporting an
error if the clock is not achievable within the bounds of HDMI
clocking requirements.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Add CRTC mode validation to reject modes that the CRTC does not support.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Ensure that the hardware is disabled prior to tearing down the modeset
support.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Add and use bit definitions for RDREG4F on Dove Armada 510.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Add a drm_mode_set_crtcinfo() call in our CRTC's mode_fixup callback
to ensure that any adjustments to the mode made by connectors etc are
properly accounted for by the CRTC.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Add some comments about the format of the HWC32 cursor colour format.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Add support for setting gamma through both the legacy interfaces and
the atomic interfaces.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Move the plane address and pitch calculations to atomic_check rather
than the update function, so we don't have to probe the interlace
setting for the CRTC while updating the plane.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Interlaced support has been missing from the overlay frame, which is
sub-optimal.  Add support for this missing feature.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

When the CRTC is programmed for interlace, we have to halve the Y
parameters for the plane.  Rather than doing this in the update
function (which would need the calculation repeated for the old
state as well as the new state), arrange to do the calculation in
atomic_check and save it in our private plane state structure.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Add accessors for getting the register values for the plane from the
plane state.  This will allow us to generate the values when validating
the plane rather than when programming, which allows us to fix the
interlace handling without adding lots of additional handling in the
update functions.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Use the __drm_atomic_helper_plane_reset() helper in the overlay reset
code to ensure that generic features are correctly reset in future.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

We support interlace, but this was broken when we could no longer get
a ref on the vblank interrupt.  Arrange to get the ref on the vblank
interrupt after we've re-enabled vblank, and put it before we disable
the vblank.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

Pull perf fixes from Ingo Molnar:
 "I'd like to apologize for this very late pull request: I was dithering
  through the week whether to send the fixes, and then yesterday Jiri's
  crash fix for a regression introduced in this cycle clearly marked
  perf/urgent as 'must merge now'.

  Most of the commits are tooling fixes, plus there's three kernel fixes
  via four commits:

    - race fix in the Intel PEBS code

    - fix an AUX bug and roll back a previous attempt

    - fix AMD family 17h generic HW cache-event perf counters

  The largest diffstat contribution comes from the AMD fix - a new event
  table is introduced, which is a fairly low risk change but has a large
  linecount"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel: Fix race in intel_pmu_disable_event()
  perf/x86/intel/pt: Remove software double buffering PMU capability
  perf/ring_buffer: Fix AUX software double buffering
  perf tools: Remove needless asm/unistd.h include fixing build in some places
  tools arch uapi: Copy missing unistd.h headers for arc, hexagon and riscv
  tools build: Add -ldl to the disassembler-four-args feature test
  perf cs-etm: Always allocate memory for cs_etm_queue::prev_packet
  perf cs-etm: Don't check cs_etm_queue::prev_packet validity
  perf report: Report OOM in status line in the GTK UI
  perf bench numa: Add define for RUSAGE_THREAD if not present
  tools lib traceevent: Change tag string for error
  perf annotate: Fix build on 32 bit for BPF annotation
  tools uapi x86: Sync vmx.h with the kernel
  perf bpf: Return value with unlocking in perf_env__find_btf()
  MAINTAINERS: Include vendor specific files under arch/*/events/*
  perf/x86/amd: Update generic hardware cache events for Family 17h

Pull scheduler fix from Ingo Molnar:
 "Fix a kobject memory leak in the cpufreq code"

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/cpufreq: Fix kobject memleak

Pull x86 fix from Ingo Molnar:
 "Disable function tracing during early SME setup to fix a boot crash on
  SME-enabled kernels running distro kernels (some of which have
  function tracing enabled)"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm/mem_encrypt: Disable all instrumentation for early SME setup

Pull vfs fixes from Al Viro:

 - a couple of ->i_link use-after-free fixes

 - regression fix for wrong errno on absent device name in mount(2)
   (this cycle stuff)

 - ancient UFS braino in large GID handling on Solaris UFS images (bogus
   cut'n'paste from large UID handling; wrong field checked to decide
   whether we should look at old (16bit) or new (32bit) field)

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  ufs: fix braino in ufs_get_inode_gid() for solaris UFS flavour
  Abort file_remove_privs() for non-reg. files
  [fix] get rid of checking for absent device name in vfs_get_tree()
  apparmorfs: fix use-after-free on symlink traversal
  securityfs: fix use-after-free on symlink traversal

New race in x86_pmu_stop() was introduced by replacing the
atomic __test_and_clear_bit() of cpuc->active_mask by separate
test_bit() and __clear_bit() calls in the following commit:

  3966c3fe ("x86/perf/amd: Remove need to check "running" bit in NMI handler")

The race causes panic for PEBS events with enabled callchains:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
  ...
  RIP: 0010:perf_prepare_sample+0x8c/0x530
  Call Trace:
   <NMI>
   perf_event_output_forward+0x2a/0x80
   __perf_event_overflow+0x51/0xe0
   handle_pmi_common+0x19e/0x240
   intel_pmu_handle_irq+0xad/0x170
   perf_event_nmi_handler+0x2e/0x50
   nmi_handle+0x69/0x110
   default_do_nmi+0x3e/0x100
   do_nmi+0x11a/0x180
   end_repeat_nmi+0x16/0x1a
  RIP: 0010:native_write_msr+0x6/0x20
  ...
   </NMI>
   intel_pmu_disable_event+0x98/0xf0
   x86_pmu_stop+0x6e/0xb0
   x86_pmu_del+0x46/0x140
   event_sched_out.isra.97+0x7e/0x160
  ...

The event is configured to make samples from PEBS drain code,
but when it's disabled, we'll go through NMI path instead,
where data->callchain will not get allocated and we'll crash:

          x86_pmu_stop
            test_bit(hwc->idx, cpuc->active_mask)
            intel_pmu_disable_event(event)
            {
              ...
              intel_pmu_pebs_disable(event);
              ...

EVENT OVERFLOW ->  <NMI>
                     intel_pmu_handle_irq
                       handle_pmi_common
   TEST PASSES ->        test_bit(bit, cpuc->active_mask))
                           perf_event_overflow
                             perf_prepare_sample
                             {
                               ...
                               if (!(sample_type & __PERF_SAMPLE_CALLCHAIN_EARLY))
                                     data->callchain = perf_callchain(event, regs);

         CRASH ->              size += data->callchain->nr;
                             }
                   </NMI>
              ...
              x86_pmu_disable_event(event)
            }

            __clear_bit(hwc->idx, cpuc->active_mask);

Fixing this by disabling the event itself before setting
off the PEBS bit.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Arcari <darcari@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Lendacky Thomas <Thomas.Lendacky@amd.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Fixes: 3966c3fe ("x86/perf/amd: Remove need to check "running" bit in NMI handler")
Link: http://lkml.kernel.org/r/20190504151556.31031-1-jolsa@kernel.orgSigned-off-by: Ingo Molnar <mingo@kernel.org>

Pull powerpc fix from Michael Ellerman:
 "One regression fix.

  Changes we merged to STRICT_KERNEL_RWX on 32-bit were causing crashes
  under load on some machines depending on memory layout.

  Thanks to Christophe Leroy"

* tag 'powerpc-5.1-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/32s: Fix BATs setting with CONFIG_STRICT_KERNEL_RWX

Pull KVM fixes from Paolo Bonzini:

 - PPC and ARM bugfixes from submaintainers

 - Fix old Windows versions on AMD (recent regression)

 - Fix old Linux versions on processors without EPT

 - Fixes for LAPIC timer optimizations

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: (21 commits)
  KVM: nVMX: Fix size checks in vmx_set_nested_state
  KVM: selftests: make hyperv_cpuid test pass on AMD
  KVM: lapic: Check for in-kernel LAPIC before deferencing apic pointer
  KVM: fix KVM_CLEAR_DIRTY_LOG for memory slots of unaligned size
  x86/kvm/mmu: reset MMU context when 32-bit guest switches PAE
  KVM: x86: Whitelist port 0x7e for pre-incrementing %rip
  Documentation: kvm: fix dirty log ioctl arch lists
  KVM: VMX: Move RSB stuffing to before the first RET after VM-Exit
  KVM: arm/arm64: Don't emulate virtual timers on userspace ioctls
  kvm: arm: Skip stage2 huge mappings for unaligned ipa backed by THP
  KVM: arm/arm64: Ensure vcpu target is unset on reset failure
  KVM: lapic: Convert guest TSC to host time domain if necessary
  KVM: lapic: Allow user to disable adaptive tuning of timer advancement
  KVM: lapic: Track lapic timer advance per vCPU
  KVM: lapic: Disable timer advancement if adaptive tuning goes haywire
  x86: kvm: hyper-v: deal with buggy TLB flush requests from WS2012
  KVM: x86: Consider LAPIC TSC-Deadline timer expired if deadline too short
  KVM: PPC: Book3S: Protect memslots while validating user address
  KVM: PPC: Book3S HV: Perserve PSSCR FAKE_SUSPEND bit on guest exit
  KVM: arm/arm64: vgic-v3: Retire pending interrupts on disabling LPIs
  ...

Merge branch 'i2c/for-current-fixed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "I2C driver bugfixes and a MAINTAINERS update for you"

* 'i2c/for-current-fixed' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: Prevent runtime suspend of adapter when Host Notify is required
  i2c: synquacer: fix enumeration of slave devices
  MAINTAINERS: friendly takeover of i2c-gpio driver
  i2c: designware: ratelimit 'transfer when suspended' errors
  i2c: imx: correct the method of getting private data in notifier_call

Pull drm fix from Dave Airlie:
 "Just a single qxl revert"

* tag 'drm-fixes-2019-05-03' of git://anongit.freedesktop.org/drm/drm:
  Revert "drm/qxl: drop prime import/export callbacks"

Pull clk fixes from Stephen Boyd:
 "Two fixes for the NKMP clks on Allwinner SoCs, a locking fix for
  clkdev where we forgot to hold a lock while iterating a list that can
  change, and finally a build fix that adds some stubs for clk APIs that
  are used by devfreq drivers on platforms without the clk APIs"

* tag 'clk-fixes-for-linus' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/clk/linux:
  clk: Add missing stubs for a few functions
  clkdev: Hold clocks_mutex while iterating clocks list
  clk: sunxi-ng: nkmp: Explain why zero width check is needed
  clk: sunxi-ng: nkmp: Avoid GENMASK(-1, 0)

Pull sound fixes from Takashi Iwai:
 "A few stable fixes at this round.

  The USB Line6 audio fixes are a bit large, but they are rather trivial
  and pretty much device-specific, so should be safe to apply at this
  late stage. Ditto for other HD-audio quirks"

* tag 'sound-5.1' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda/realtek - Apply the fixup for ASUS Q325UAR
  ALSA: line6: use dynamic buffers
  ALSA: hda/realtek - Fixed Dell AIO speaker noise
  ALSA: hda/realtek - Add new Dell platform for headset mode

Now that all AUX allocations are high-order by default, the software
double buffering PMU capability doesn't make sense any more, get rid
of it. In case some PMUs choose to opt out, we can re-introduce it.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: adrian.hunter@intel.com
Link: http://lkml.kernel.org/r/20190503085536.24119-3-alexander.shishkin@linux.intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

This recent commit:

  5768402f ("perf/ring_buffer: Use high order allocations for AUX buffers optimistically")

overlooked the fact that the previous one page granularity of the AUX buffer
provided an implicit double buffering capability to the PMU driver, which
went away when the entire buffer became one high-order page.

Always make the full-trace mode AUX allocation at least two-part to preserve
the previous behavior and allow the implicit double buffering to continue.
Reported-by: Ammy Yi <ammy.yi@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: adrian.hunter@intel.com
Fixes: 5768402f ("perf/ring_buffer: Use high order allocations for AUX buffers optimistically")
Link: http://lkml.kernel.org/r/20190503085536.24119-2-alexander.shishkin@linux.intel.comSigned-off-by: Ingo Molnar <mingo@kernel.org>

Merge tag 'perf-urgent-for-mingo-5.1-20190502' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent

Pull perf/urgent fixes from Arnaldo Carvalho de Melo:

tools UAPI:

  Arnaldo Carvalho de Melo:

  - Sync x86's vmx.h with the kernel.

  - Copy missing unistd.h headers for arc, hexagon and riscv, fixing
    a reported build regression on the ARC 32-bit architecture.

perf bench numa:

  Arnaldo Carvalho de Melo:

  - Add define for RUSAGE_THREAD if not present, fixing the build on the
    ARC architecture when only zlib and libnuma are present.

perf BPF:

  Arnaldo Carvalho de Melo:

  - The disassembler-four-args feature test needs -ldl on distros such as
    Mageia 7.

  Bo YU:

  - Fix unlocking on success in perf_env__find_btf(), detected with
    the coverity tool.

libtraceevent:

  Leo Yan:

  - Change misleading hard coded 'trace-cmd' string in error messages.

ARM hardware tracing:

  Leo Yan:

  - Always allocate memory for cs_etm_queue::prev_packet, fixing a segfault
    when processing CoreSight perf data.

perf annotate:

  Thadeu Lima de Souza Cascardo:

  - Fix build on 32 bit for BPF.

perf report:

  Thomas Richter:

  - Report OOM in status line in the GTK UI.

core libs:

  - Remove needless asm/unistd.h that, used with sys/syscall.h ended
    up redefining the syscalls defines in environments such as the
    ARC arch when using uClibc.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

- One revert for QXL for a DRI3 breakage
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190502122529.hguztj3kncaixe3d@flea

We were including sys/syscall.h and asm/unistd.h, since sys/syscall.h
includes asm/unistd.h, sometimes this leads to the redefinition of
defines, breaking the build.

Noticed on ARC with uCLibc.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Rich Felker <dalias@libc.org>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Link: https://lkml.kernel.org/n/tip-xjpf80o64i2ko74aj2jih0qg@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Since those were introduced in:

  c8ce48f0 ("asm-generic: Make time32 syscall numbers optional")

But when the asm-generic/unistd.h was sync'ed with tools/ in:

  1a787fc5 ("tools headers uapi: Sync copy of asm-generic/unistd.h with the kernel sources")

I forgot to copy the files for the architectures that define
__ARCH_WANT_TIME32_SYSCALLS, so the perf build was breaking there, as
reported by Vineet Gupta for the ARC architecture.

After updating my ARC container to use the glibc based toolchain + cross
building libnuma, zlib and elfutils, I finally managed to reproduce the
problem and verify that this now is fixed and will not regress as will
be tested before each pull req sent upstream.
Reported-by: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Olsa <jolsa@kernel.org>
CC: linux-snps-arc@lists.infradead.org
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/r/20190426193531.GC28586@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Thomas Backlund reported that the perf build was failing on the Mageia 7
distro, that is because it uses:

  cat /tmp/build/perf/feature/test-disassembler-four-args.make.output
  /usr/bin/ld: /usr/lib64/libbfd.a(plugin.o): in function `try_load_plugin':
  /home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:243:
  undefined reference to `dlopen'
  /usr/bin/ld:
  /home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:271:
  undefined reference to `dlsym'
  /usr/bin/ld:
  /home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:256:
  undefined reference to `dlclose'
  /usr/bin/ld:
  /home/iurt/rpmbuild/BUILD/binutils-2.32/objs/bfd/../../bfd/plugin.c:246:
  undefined reference to `dlerror'
  as we allow dynamic linking and loading

Mageia 7 uses these linker flags:
  $ rpm --eval %ldflags
    -Wl,--as-needed -Wl,--no-undefined -Wl,-z,relro -Wl,-O1 -Wl,--build-id -Wl,--enable-new-dtags

So add -ldl to this feature LDFLAGS.
Reported-by: Thomas Backlund <tmb@mageia.org>
Tested-by: Thomas Backlund <tmb@mageia.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Link: https://lkml.kernel.org/r/20190501173158.GC21436@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Robert Walker reported a segmentation fault is observed when process
CoreSight trace data; this issue can be easily reproduced by the command
'perf report --itrace=i1000i' for decoding tracing data.

If neither the 'b' flag (synthesize branches events) nor 'l' flag
(synthesize last branch entries) are specified to option '--itrace',
cs_etm_queue::prev_packet will not been initialised.  After merging the
code to support exception packets and sample flags, there introduced a
number of uses of cs_etm_queue::prev_packet without checking whether it
is valid, for these cases any accessing to uninitialised prev_packet
will cause crash.

As cs_etm_queue::prev_packet is used more widely now and it's already
hard to follow which functions have been called in a context where the
validity of cs_etm_queue::prev_packet has been checked, this patch
always allocates memory for cs_etm_queue::prev_packet.
Reported-by: Robert Walker <robert.walker@arm.com>
Suggested-by: Robert Walker <robert.walker@arm.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Suzuki K Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Fixes: 7100b12c ("perf cs-etm: Generate branch sample for exception packet")
Fixes: 24fff5eb ("perf cs-etm: Avoid stale branch samples when flush packet")
Link: http://lkml.kernel.org/r/20190428083228.20246-1-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Since cs_etm_queue::prev_packet is allocated for all cases, it will
never be NULL pointer; now validity checking prev_packet is pointless,
remove all of them.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Suzuki K Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20190428083228.20246-2-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

An -ENOMEM error is not reported in the GTK GUI.  Instead this error
message pops up on the screen:

[root@m35lp76 perf]# ./perf  report -i perf.data.error68-1

	Processing events... [974K/3M]
	Error:failed to process sample

	0xf4198 [0x8]: failed to process type: 68

However when I use the same perf.data file with --stdio it works:

[root@m35lp76 perf]# ./perf  report -i perf.data.error68-1 --stdio \
		| head -12

  # Total Lost Samples: 0
  #
  # Samples: 76K of event 'cycles'
  # Event count (approx.): 99056160000
  #
  # Overhead  Command          Shared Object      Symbol
  # ........  ...............  .................  .........
  #
     8.81%  find             [kernel.kallsyms]  [k] ftrace_likely_update
     8.74%  swapper          [kernel.kallsyms]  [k] ftrace_likely_update
     8.34%  sshd             [kernel.kallsyms]  [k] ftrace_likely_update
     2.19%  kworker/u512:1-  [kernel.kallsyms]  [k] ftrace_likely_update

The sample precentage is a bit low.....

The GUI always fails in the FINISHED_ROUND event (68) and does not
indicate the reason why.

When happened is the following. Perf report calls a lot of functions and
down deep when a FINISHED_ROUND event is processed, these functions are
called:

  perf_session__process_event()
  + perf_session__process_user_event()
    + process_finished_round()
      + ordered_events__flush()
        + __ordered_events__flush()
	  + do_flush()
	    + ordered_events__deliver_event()
	      + perf_session__deliver_event()
	        + machine__deliver_event()
	          + perf_evlist__deliver_event()
	            + process_sample_event()
	              + hist_entry_iter_add() --> only called in GUI case!!!
	                + hist_iter__report__callback()
	                  + symbol__inc_addr_sample()

	                    Now this functions runs out of memory and
			    returns -ENOMEM. This is reported all the way up
			    until function

perf_session__process_event() returns to its caller, where -ENOMEM is
changed to -EINVAL and processing stops:

 if ((skip = perf_session__process_event(session, event, head)) < 0) {
      pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
	     head, event->header.size, event->header.type);
      err = -EINVAL;
      goto out_err;
 }

This occurred in the FINISHED_ROUND event when it has to process some
10000 entries and ran out of memory.

This patch indicates the root cause and displays it in the status line
of ther perf report GUI.

Output before (on GUI status line):

  0xf4198 [0x8]: failed to process type: 68

Output after:

  0xf4198 [0x8]: failed to process type: 68 [not enough memory]

Committer notes:

the 'skip' variable needs to be initialized to -EINVAL, so that when the
size is less than sizeof(struct perf_event_attr) we avoid this valid
compiler warning:

  util/session.c: In function ‘perf_session__process_events’:
  util/session.c:1936:7: error: ‘skip’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     err = skip;
     ~~~~^~~~~~
  util/session.c:1874:6: note: ‘skip’ was declared here
    s64 skip;
        ^~~~
  cc1: all warnings being treated as errors
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20190423105303.61683-1-tmricht@linux.ibm.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

While cross building perf to the ARC architecture on a fedora 30 host,
we were failing with:

      CC       /tmp/build/perf/bench/numa.o
  bench/numa.c: In function ‘worker_thread’:
  bench/numa.c:1261:12: error: ‘RUSAGE_THREAD’ undeclared (first use in this function); did you mean ‘SIGEV_THREAD’?
    getrusage(RUSAGE_THREAD, &rusage);
              ^~~~~~~~~~~~~
              SIGEV_THREAD
  bench/numa.c:1261:12: note: each undeclared identifier is reported only once for each function it appears in

[perfbuilder@60d5802468f6 perf]$ /arc_gnu_2019.03-rc1_prebuilt_uclibc_le_archs_linux_install/bin/arc-linux-gcc --version | head -1
arc-linux-gcc (ARCv2 ISA Linux uClibc toolchain 2019.03-rc1) 8.3.1 20190225
[perfbuilder@60d5802468f6 perf]$

Trying to reproduce a report by Vineet, I noticed that, with just
cross-built zlib and numactl libraries, I ended up with the above
failure.

So, since RUSAGE_THREAD is available as a define, check for that and
numactl libraries, I ended up with the above failure.

So, since RUSAGE_THREAD is available as a define in the system headers,
check if it is defined in the 'perf bench numa' sources and define it if
not.

Now it builds and I have to figure out if the problem reported by Vineet
only takes place if we have libelf or some other library available.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: linux-snps-arc@lists.infradead.org
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>
Link: https://lkml.kernel.org/n/tip-2wb4r1gir9xrevbpq7qp0amk@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

The traceevent lib is used by the perf tool, and when executing

  perf test -v 6

it outputs error log on the ARM64 platform:

  running test 33 '*:*'trace-cmd: No such file or directory

  [...]

  trace-cmd: Invalid argument

The trace event parsing code originally came from trace-cmd so it keeps
the tag string "trace-cmd" for errors, this easily introduces the
impression that the perf tool launches trace-cmd command for trace event
parsing, but in fact the related parsing is accomplished by the
traceevent lib.

This patch changes the tag string to "libtraceevent" so that we can
avoid confusion and let users to more easily connect the error with
traceevent lib.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20190424013802.27569-1-leo.yan@linaro.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>