It can be convenient to put a string value into a ptwrite payload as
a quick and easy way to identify what is being printed.

To make that useful, if the Intel ptwrite payload value contains only
printable ASCII characters padded with NULLs, then print it also as a
string.

Using the example program from the "Emulated PTWRITE" section of
tools/perf/Documentation/perf-intel-pt.txt:

 $ echo -n "Hello" | od -t x8
 0000000 0000006f6c6c6548
 0000005
 $ perf record -e intel_pt//u ./eg_ptw 0x0000006f6c6c6548
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.016 MB perf.data ]
 $ perf script --itrace=ew intel-pt-events.py
 Intel PT Branch Trace, Power Events, Event Trace and PTWRITE
      Switch In   38524/38524 [001]     24166.044995916     0/0
           eg_ptw 38524/38524 [001]     24166.045380004   ptwrite  jmp                   IP: 0 payload: 0x6f6c6c6548 Hello     56532c7ce196 perf_emulate_ptwrite+0x16 (/home/ahunter/git/work/eg_ptw)
 End
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220509152400.376613-4-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

It can be convenient to put a string value into a ptwrite payload as
a quick and easy way to identify what is being printed.

To make that useful, if the Intel ptwrite payload value contains only
printable ASCII characters padded with NULLs, then print it also as a
string.

Using the example program from the "Emulated PTWRITE" section of
tools/perf/Documentation/perf-intel-pt.txt:

 $ echo -n "Hello" | od -t x8
 0000000 0000006f6c6c6548
 0000005
 $ perf record -e intel_pt//u ./eg_ptw 0x0000006f6c6c6548
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.016 MB perf.data ]
 $ perf script --itrace=ew
           eg_ptw 35563 [005] 18256.087338:     ptwrite:  IP: 0 payload: 0x6f6c6c6548 Hello      55e764db5196 perf_emulate_ptwrite+0x16 (/home/user/eg_ptw)
 $
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220509152400.376613-3-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

ptwrite is an Intel x86 instruction that writes arbitrary values into an
Intel PT trace. It is not supported on all hardware, so provide an
alternative that makes use of TNT packets to convey the payload data.
TNT packets encode Taken/Not-taken conditional branch information, so
taking branches based on the payload value will encode the value into
the TNT packet. Refer to the changes to the documentation file
perf-intel-pt.txt in this patch for an example.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220509152400.376613-2-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Cast pointers to unsigned long instead of to uint64_t to avoid this
problem on 32-bit arches:

  31     6.89 debian:experimental-x-mips    : FAIL gcc version 11.2.0 (Debian 11.2.0-18)
    bench/breakpoint.c: In function 'breakpoint_setup':
    bench/breakpoint.c:56:24: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
       56 |         attr.bp_addr = (uint64_t)addr;
          |                        ^
    cc1: all warnings being treated as errors
    make[3]: *** [/git/perf-5.18.0-rc7/tools/build/Makefile.build:139: bench] Error 2

Fixes: 68a6772f ("perf bench: Add breakpoint benchmarks")
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/YoLq1nHx1doi+VWl@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

To pick up fixes from perf/urgent.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Merge tag 'driver-core-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fixes from Greg KH:
 "Here is one fix, and three documentation updates for 5.18-rc7.

  The fix is for the firmware loader which resolves a long-reported
  problem where the credentials of the firmware loader could be set to a
  userspace process without enough permissions to actually load the
  firmware image. Many Android vendors have been reporting this for
  quite some time.

  The documentation updates are for the embargoed-hardware-issues.rst
  file to add a new entry, change an existing one, and sort the list to
  make changes easier in the future.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  Documentation/process: Update ARM contact for embargoed hardware issues
  Documentation/process: Add embargoed HW contact for Ampere Computing
  Documentation/process: Make groups alphabetical and use tabs consistently
  firmware_loader: use kernel credentials when reading firmware

Pull char/misc driver fixes from Greg KH:
 "Here are two small driver fixes for 5.18-rc7 that resolve reported
  problems:

   - slimbus driver irq bugfix

   - interconnect sync state bugfix

  Both of these have been in linux-next with no reported problems"

* tag 'char-misc-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  slimbus: qcom: Fix IRQ check in qcom_slim_probe
  interconnect: Restore sync state by ignoring ipa-virt in provider count

Pull tty/serial driver fixes from Greg KH:
 "Here are some small tty n_gsm and serial driver fixes for 5.18-rc7
  that resolve reported problems. They include:

   - n_gsm fixes for reported issues

   - 8250_mtk driver fixes for some platforms

   - fsl_lpuart driver fix for reported problem.

   - digicolor driver fix for reported problem.

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

* tag 'tty-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  fsl_lpuart: Don't enable interrupts too early
  tty: n_gsm: fix invalid gsmtty_write_room() result
  tty: n_gsm: fix mux activation issues in gsm_config()
  tty: n_gsm: fix buffer over-read in gsm_dlci_data()
  serial: 8250_mtk: Fix register address for XON/XOFF character
  serial: 8250_mtk: Make sure to select the right FEATURE_SEL
  serial: 8250_mtk: Fix UART_EFR register address
  tty/serial: digicolor: fix possible null-ptr-deref in digicolor_uart_probe()

Pull USB fixes from Greg KH:
 "Here are some small fixes for reported issues with some USB drivers.
  They include:

   - xhci fixes for xhci-mtk platform driver

   - typec driver fixes for reported problems.

   - cdc-wdm read-stuck fix

   - gadget driver fix for reported race condition

   - new usb-serial driver ids

  All of these have been in linux-next with no reported problems"

* tag 'usb-5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
  usb: xhci-mtk: remove bandwidth budget table
  usb: xhci-mtk: fix fs isoc's transfer error
  usb: gadget: fix race when gadget driver register via ioctl
  usb: typec: tcpci_mt6360: Update for BMC PHY setting
  usb: gadget: uvc: allow for application to cleanly shutdown
  usb: typec: tcpci: Don't skip cleanup in .remove() on error
  usb: cdc-wdm: fix reading stuck on device close
  USB: serial: qcserial: add support for Sierra Wireless EM7590
  USB: serial: option: add Fibocom MA510 modem
  USB: serial: option: add Fibocom L610 modem
  USB: serial: pl2303: add device id for HP LM930 Display

Pull powerpc fix from Michael Ellerman:

 - Fix KVM PR on 32-bit, which was broken by some MMU code refactoring.

Thanks to: Alexander Graf, and Matt Evans.

* tag 'powerpc-5.18-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu_context()

Pull x86 fix from Thomas Gleixner:
 "A single fix for the handling of unpopulated sub-pmd spaces.

  The copy & pasta from the corresponding s390 code screwed up the
  address calculation for marking the sub-pmd ranges via memset by
  omitting the ALIGN_DOWN() to calculate the proper start address.

  It's a mystery why this code is not generic and shared because there
  is nothing architecture specific in there, but that's too intrusive
  for a backportable fix"

* tag 'x86-urgent-2022-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Fix marking of unused sub-pmd ranges

Pull scheduler fix from Thomas Gleixner:
 "The recent expansion of the sched switch tracepoint inserted a new
  argument in the middle of the arguments. This reordering broke BPF
  programs which relied on the old argument list.

  While tracepoints are not considered stable ABI, it's not trivial to
  make BPF cope with such a change, but it's being worked on. For now
  restore the original argument order and move the new argument to the
  end of the argument list"

* tag 'sched-urgent-2022-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/tracing: Append prev_state to tp args instead

Pull irq fix from Thomas Gleixner:
 "A single fix for a recent (introduced in 5.16) regression in the core
  interrupt code.

  The consolidation of the interrupt handler invocation code added an
  unconditional warning when generic_handle_domain_irq() is invoked from
  outside hard interrupt context. That's overbroad as the requirement
  for invoking these handlers in hard interrupt context is only required
  for certain interrupt types. The subsequently called code already
  contains a warning which triggers conditionally for interrupt chips
  which indicate this requirement in their properties.

  Remove the overbroad one"

* tag 'irq-urgent-2022-05-15' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Remove WARN_ON_ONCE() in generic_handle_domain_irq()

Merge tag 'perf-tools-fixes-for-v5.18-2022-05-14' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux

Pull perf tools fixes from Arnaldo Carvalho de Melo:

 - Fix two NDEBUG warnings in 'perf bench numa'

 - Fix ARM coresight `perf test` failure

 - Sync linux/kvm.h with the kernel sources

 - Add James and Mike as Arm64 performance events reviewers

* tag 'perf-tools-fixes-for-v5.18-2022-05-14' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux:
  MAINTAINERS: Add James and Mike as Arm64 performance events reviewers
  tools headers UAPI: Sync linux/kvm.h with the kernel sources
  perf tests: Fix coresight `perf test` failure.
  perf bench: Fix two numa NDEBUG warnings

Pull more drm fixes from Dave Airlie:
 "Turns out I was right, some fixes hadn't made it to me yet. The vmwgfx
  ones also popped up later, but all seem like bad enough things to fix.
  The dma-buf, vc4 and nouveau ones are all pretty small.

  The fbdev fixes are a bit more complicated: a fix to cleanup fbdev
  devices properly, uncovered some use-after-free bugs in existing
  drivers. Then the fix for those bugs wasn't correct. This reverts that
  fix, and puts the proper fixes in place in the drivers to avoid the
  use-after-frees.

  This has had a fair number of eyes on it at this stage, and I'm
  confident enough that it puts things in the right place, and is less
  dangerous than reverting our way out of the initial change at this
  stage.

  fbdev:
   - revert NULL deref fix that turned into a use-after-free
   - prevent use-after-free in fbdev
   - efifb/simplefb/vesafb: fix cleanup paths to avoid use-after-frees

  dma-buf:
   - fix panic in stats setup

  vc4:
   - fix hdmi build

  nouveau:
   - tegra iommu present fix
   - fix leak in backlight name

  vmwgfx:
   - Black screen due to fences using FIFO checks on SVGA3
   - Random black screens on boot due to uninitialized drm_mode_fb_cmd2
   - Hangs on SVGA3 due to command buffers being used with gbobjects"

* tag 'drm-fixes-2022-05-14' of git://anongit.freedesktop.org/drm/drm:
  drm/vmwgfx: Disable command buffers on svga3 without gbobjects
  drm/vmwgfx: Initialize drm_mode_fb_cmd2
  drm/vmwgfx: Fix fencing on SVGAv3
  drm/vc4: hdmi: Fix build error for implicit function declaration
  dma-buf: call dma_buf_stats_setup after dmabuf is in valid list
  fbdev: efifb: Fix a use-after-free due early fb_info cleanup
  drm/nouveau: Fix a potential theorical leak in nouveau_get_backlight_name()
  drm/nouveau/tegra: Stop using iommu_present()
  fbdev: vesafb: Cleanup fb_info in .fb_destroy rather than .remove
  fbdev: efifb: Cleanup fb_info in .fb_destroy rather than .remove
  fbdev: simplefb: Cleanup fb_info in .fb_destroy rather than .remove
  fbdev: Prevent possible use-after-free in fb_release()
  Revert "fbdev: Make fb_release() return -ENODEV if fbdev was unregistered"

Multiple fixes to fbdev to address a regression at unregistration, an
iommu detection improvement for nouveau, a memory leak fix for nouveau,
pointer dereference fix for dma_buf_file_release(), and a build breakage
fix for vc4
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220513073044.ymayac7x7bzatrt7@houat

Merge tag 'vmwgfx-drm-fixes-5.18-2022-05-13' of https://gitlab.freedesktop.org/zack/vmwgfx into drm-fixes

vmwgfx fixes for:
- Black screen due to fences using FIFO checks on SVGA3
- Random black screens on boot due to uninitialized drm_mode_fb_cmd2
- Hangs on SVGA3 due to command buffers being used with gbobjects
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Zack Rusin <zackr@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/a1d32799e4c74b8540216376d7576bb783ca07ba.camel@vmware.com

Pull gfs2 fixes from Andreas Gruenbacher:
 "We've finally identified commit dc732906 ("gfs2: Introduce flag
  for glock holder auto-demotion") to be the other cause of the
  filesystem corruption we've been seeing. This feature isn't strictly
  necessary anymore, so we've decided to stop using it for now.

  With this and the gfs_iomap_end rounding fix you've already seen
  ("gfs2: Fix filesystem block deallocation for short writes" in this
  pull request), we're corruption free again now.

   - Fix filesystem block deallocation for short writes.

   - Stop using glock holder auto-demotion for now.

   - Get rid of buffered writes inefficiencies due to page faults being
     disabled.

   - Minor other cleanups"

* tag 'gfs2-v5.18-rc4-fix3' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
  gfs2: Stop using glock holder auto-demotion for now
  gfs2: buffered write prefaulting
  gfs2: Align read and write chunks to the page cache
  gfs2: Pull return value test out of should_fault_in_pages
  gfs2: Clean up use of fault_in_iov_iter_{read,write}able
  gfs2: Variable rename
  gfs2: Fix filesystem block deallocation for short writes

We're having unresolved issues with the glock holder auto-demotion mechanism
introduced in commit dc732906.  This mechanism was assumed to be essential
for avoiding frequent short reads and writes until commit 296abc0d
("gfs2: No short reads or writes upon glock contention").  Since then,
when the inode glock is lost, it is simply re-acquired and the operation
is resumed.  This means that apart from the performance penalty, we
might as well drop the inode glock before faulting in pages, and
re-acquire it afterwards.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

In gfs2_file_buffered_write, to increase the likelihood that all the
user memory we're trying to write will be resident in memory, carry out
the write in chunks and fault in each chunk of user memory before trying
to write it.  Otherwise, some workloads will trigger frequent short
"internal" writes, causing filesystem blocks to be allocated and then
partially deallocated again when writing into holes, which is wasteful
and breaks reservations.

Neither the chunked writes nor any of the short "internal" writes are
user visible.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Pull SCSI fixes from James Bottomley:
 "Four fixes, all in drivers.

  These patches mosly fix error legs and exceptional conditions
  (scsi_dh_alua, qla2xxx). The lpfc fixes are for coding issues with
  lpfc features"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: lpfc: Correct BDE DMA address assignment for GEN_REQ_WQE
  scsi: lpfc: Fix split code for FLOGI on FCoE
  scsi: qla2xxx: Fix missed DMA unmap for aborted commands
  scsi: scsi_dh_alua: Properly handle the ALUA transitioning state

Align the chunks that reads and writes are carried out in to the page
cache rather than the user buffers.  This will be more efficient in
general, especially for allocating writes.  Optimizing the case that the
user buffer is gfs2 backed isn't very useful; we only need to make sure
we won't deadlock.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Pull the return value test of the previous read or write operation out
of should_fault_in_pages().  In a following patch, we'll fault in pages
before the I/O and there will be no return value to check.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

No need to store the return value of the fault_in functions in separate
variables.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Instead of counting the number of bytes read from the filesystem,
functions gfs2_file_direct_read and gfs2_file_read_iter count the number
of bytes written into the user buffer.  Conversely, functions
gfs2_file_direct_write and gfs2_file_buffered_write count the number of
bytes read from the user buffer.  This is nothing but confusing, so
change the read functions to count how many bytes they have read, and
the write functions to count how many bytes they have written.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

When a write cannot be carried out in full, gfs2_iomap_end() releases
blocks that have been allocated for this write but haven't been used.

To compute the end of the allocation, gfs2_iomap_end() incorrectly
rounded the end of the attempted write down to the next block boundary
to arrive at the end of the allocation.  It would have to round up, but
the end of the allocation is also available as iomap->offset +
iomap->length, so just use that instead.

In addition, use round_up() for computing the start of the unused range.

Fixes: 64bc06bb ("gfs2: iomap buffered write support")
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Pull ceph fix from Ilya Dryomov:
 "Two fixes to properly maintain xattrs on async creates and thus
  preserve SELinux context on newly created files and to avoid improper
  usage of folio->private field which triggered BUG_ONs.

  Both marked for stable"

* tag 'ceph-for-5.18-rc7' of https://github.com/ceph/ceph-client:
  ceph: check folio PG_private bit instead of folio->private
  ceph: fix setting of xattrs on async created inodes

Pull NFS client bugfixes from Trond Myklebust:
 "One more pull request. There was a bug in the fix to ensure that gss-
  proxy continues to work correctly after we fixed the AF_LOCAL socket
  leak in the RPC code. This therefore reverts that broken patch, and
  replaces it with one that works correctly.

  Stable fixes:

   - SUNRPC: Ensure that the gssproxy client can start in a connected
     state

  Bugfixes:

   - Revert "SUNRPC: Ensure gss-proxy connects on setup"

   - nfs: fix broken handling of the softreval mount option"

* tag 'nfs-for-5.18-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  nfs: fix broken handling of the softreval mount option
  SUNRPC: Ensure that the gssproxy client can start in a connected state
  Revert "SUNRPC: Ensure gss-proxy connects on setup"

Pull misc fixes from Andrew Morton:
 "Seven MM fixes, three of which address issues added in the most recent
  merge window, four of which are cc:stable.

  Three non-MM fixes, none very serious"

[ And yes, that's a real pull request from Andrew, not me creating a
  branch from emailed patches. Woo-hoo! ]

* tag 'mm-hotfixes-stable-2022-05-11' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm:
  MAINTAINERS: add a mailing list for DAMON development
  selftests: vm: Makefile: rename TARGETS to VMTARGETS
  mm/kfence: reset PG_slab and memcg_data before freeing __kfence_pool
  mailmap: add entry for martyna.szapar-mudlaw@intel.com
  arm[64]/memremap: don't abuse pfn_valid() to ensure presence of linear map
  procfs: prevent unprivileged processes accessing fdinfo dir
  mm: mremap: fix sign for EFAULT error return value
  mm/hwpoison: use pr_err() instead of dump_page() in get_any_page()
  mm/huge_memory: do not overkill when splitting huge_zero_page
  Revert "mm/memory-failure.c: skip huge_zero_page in memory_failure()"

Pull arm64 fixes from Will Deacon:

 - TLB invalidation workaround for Qualcomm Kryo-4xx "gold" CPUs

 - Fix broken dependency in the vDSO Makefile

 - Fix pointer authentication overrides in ISAR2 ID register

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Enable repeat tlbi workaround on KRYO4XX gold CPUs
  arm64: cpufeature: remove duplicate ID_AA64ISAR2_EL1 entry
  arm64: vdso: fix makefile dependency on vdso.so

Merge tag 'hwmon-for-v5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fixes from Guenter Roeck:

 - Restrict ltq-cputemp to SOC_XWAY to fix build failure

 - Add OF device ID table to tmp401 driver to enable auto-load

* tag 'hwmon-for-v5.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (ltq-cputemp) restrict it to SOC_XWAY
  hwmon: (tmp401) Add OF device ID table

Pull drm fixes from Dave Airlie:
 "Pretty quiet week on the fixes front, 4 amdgpu and one i915 fix.

  I think there might be a few misc fbdev ones outstanding, but I'll see
  if they are necessary and pass them on if so.

  amdgpu:

   - Disable ASPM for VI boards on ADL platforms

   - S0ix DCN3.1 display fix

   - Resume regression fix

   - Stable pstate fix

  i915:

   - fix for kernel memory corruption when running a lot of OpenCL tests
     in parallel"

* tag 'drm-fixes-2022-05-13' of git://anongit.freedesktop.org/drm/drm:
  drm/amdgpu/ctx: only reset stable pstate if the user changed it (v2)
  Revert "drm/amd/pm: keep the BACO feature enabled for suspend"
  drm/i915: Fix race in __i915_vma_remove_closed
  drm/amd/display: undo clearing of z10 related function pointers
  drm/amdgpu: vi: disable ASPM on Intel Alder Lake based systems

With very limited vram on svga3 it's difficult to handle all the surface
migrations. Without gbobjects, i.e. the ability to store surfaces in
guest mobs, there's no reason to support intermediate svga2 features,
especially because we can fall back to fb traces and svga3 will never
support those in-between features.

On svga3 we wither want to use fb traces or screen targets
(i.e. gbobjects), nothing in between. This fixes presentation on a lot
of fusion/esxi tech previews where the exposed svga3 caps haven't been
finalized yet.
Signed-off-by: Zack Rusin <zackr@vmware.com>
Fixes: 2cd80dbd ("drm/vmwgfx: Add basic support for SVGA3")
Cc: <stable@vger.kernel.org> # v5.14+
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220318174332.440068-5-zack@kde.org

Transition to drm_mode_fb_cmd2 from drm_mode_fb_cmd left the structure
unitialized. drm_mode_fb_cmd2 adds a few additional members, e.g. flags
and modifiers which were never initialized. Garbage in those members
can cause random failures during the bringup of the fbcon.

Initializing the structure fixes random blank screens after bootup due
to flags/modifiers mismatches during the fbcon bring up.

Fixes: dabdcdc9 ("drm/vmwgfx: Switch to mode_cmd2")
Signed-off-by: Zack Rusin <zackr@vmware.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: <stable@vger.kernel.org> # v4.10+
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220302152426.885214-7-zack@kde.org

Port of the vmwgfx to SVGAv3 lacked support for fencing. SVGAv3 removed
FIFO's and replaced them with command buffers and extra registers.
The initial version of SVGAv3 lacked support for most advanced features
(e.g. 3D) which made fences unnecessary. That is no longer the case,
especially as 3D support is being turned on.

Switch from FIFO commands and capabilities to command buffers and extra
registers to enable fences on SVGAv3.

Fixes: 2cd80dbd ("drm/vmwgfx: Add basic support for SVGA3")
Signed-off-by: Zack Rusin <zackr@vmware.com>
Reviewed-by: Martin Krastev <krastevm@vmware.com>
Reviewed-by: Maaz Mombasawala <mombasawalam@vmware.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220302152426.885214-5-zack@kde.org

Merge tag 'icc-5.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/djakov/icc into char-misc-linus

Pull interconnect fixes from Georgi:
 "interconnect fixes for v5.18-rc

  This contains an additional fix for sc7180 and sdx55 platforms that helps
  them to enter suspend even on devices that don't have the most recent DT
  changes.

  - interconnect: Restore sync state by ignoring ipa-virt in provider count

  Signed-off-by: Georgi Djakov <djakov@kernel.org>"

* tag 'icc-5.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/djakov/icc:
  interconnect: Restore sync state by ignoring ipa-virt in provider count

machines__find_host() does not exist. Remove declaration.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20220513084459.6581-1-adrian.hunter@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Add 2 benchmarks:

1. Performance of thread creation/exiting in presence of breakpoints.
2. Performance of breakpoint modification in presence of threads.

The benchmarks capture use cases that we are interested in:
using inheritable breakpoints in large highly-threaded applications.

The benchmarks show significant slowdown imposed by breakpoints
(even when they don't fire).

Testing on Intel 8173M with 112 HW threads show:

  perf bench --repeat=56 breakpoint thread --breakpoints=0 --parallelism=56 --threads=20
        78.675000 usecs/op
  perf bench --repeat=56 breakpoint thread --breakpoints=4 --parallelism=56 --threads=20
     12967.135714 usecs/op

That's 165x slowdown due to presence of the breakpoints.

  perf bench --repeat=20000 breakpoint enable --passive=0 --active=0
         1.433250 usecs/op
  perf bench --repeat=20000 breakpoint enable --passive=224 --active=0
       585.318400 usecs/op
  perf bench --repeat=20000 breakpoint enable --passive=0 --active=111
       635.953000 usecs/op

That's 408x and 444x slowdown due to presence of threads.

Profiles show some overhead in toggle_bp_slot,
but also very high contention:

    90.83%  breakpoint-thre  [kernel.kallsyms]  [k] osq_lock
     4.69%  breakpoint-thre  [kernel.kallsyms]  [k] mutex_spin_on_owner
     2.06%  breakpoint-thre  [kernel.kallsyms]  [k] __reserve_bp_slot
     2.04%  breakpoint-thre  [kernel.kallsyms]  [k] toggle_bp_slot

    79.01%  breakpoint-enab  [kernel.kallsyms]  [k] smp_call_function_single
     9.94%  breakpoint-enab  [kernel.kallsyms]  [k] llist_add_batch
     5.70%  breakpoint-enab  [kernel.kallsyms]  [k] _raw_spin_lock_irq
     1.84%  breakpoint-enab  [kernel.kallsyms]  [k] event_function_call
     1.12%  breakpoint-enab  [kernel.kallsyms]  [k] send_call_function_single_ipi
     0.37%  breakpoint-enab  [kernel.kallsyms]  [k] generic_exec_single
     0.24%  breakpoint-enab  [kernel.kallsyms]  [k] __perf_event_disable
     0.20%  breakpoint-enab  [kernel.kallsyms]  [k] _perf_event_enable
     0.18%  breakpoint-enab  [kernel.kallsyms]  [k] toggle_bp_slot

Committer notes:

Fixup struct init for older compilers:

   3    32.90 alpine:3.5                    : FAIL clang version 3.8.1 (tags/RELEASE_381/final)
    bench/breakpoint.c:49:34: error: missing field 'size' initializer [-Werror,-Wmissing-field-initializers]
            struct perf_event_attr attr = {0};
                                            ^
    1 error generated.
   7    37.31 alpine:3.9                    : FAIL gcc version 8.3.0 (Alpine 8.3.0)
    bench/breakpoint.c:49:34: error: missing field 'size' initializer [-Werror,-Wmissing-field-initializers]
            struct perf_event_attr attr = {0};
                                            ^
    1 error generated.
Signed-off-by: Dmitriy Vyukov <dvyukov@google.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Marco Elver <elver@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220505155745.1690906-1-dvyukov@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

The unused part precedes the new range spanned by the start, end parameters
of vmemmap_use_new_sub_pmd(). This means it actually goes from
ALIGN_DOWN(start, PMD_SIZE) up to start.

Use the correct address when applying the mark using memset.

Fixes: 8d400913 ("x86/vmemmap: handle unpopulated sub-pmd ranges")
Signed-off-by: Adrian-Ken Rueegsegger <ken@codelabs.ch>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220509090637.24152-2-ken@codelabs.ch