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  1. 17 Jun, 2021 1 commit
  3. 11 Jun, 2021 5 commits
    • Rafael J. Wysocki's avatar
      cpuidle: teo: Use kerneldoc documentation in admin-guide · 154ae8bb
      Rafael J. Wysocki authored 
      There are two descriptions of the TEO (Timer Events Oriented) cpuidle
governor in the kernel source tree, one in the C file containing its
code and one in cpuidle.rst which is part of admin-guide.

Instead of trying to keep them both in sync and in order to reduce
text duplication, include the governor description from the C file
directly into cpuidle.rst.
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      154ae8bb
    • Rafael J. Wysocki's avatar
      cpuidle: teo: Rework most recent idle duration values treatment · 77577558
      Rafael J. Wysocki authored 
      The TEO (Timer Events Oriented) cpuidle governor uses several most
recent idle duration values for a given CPU to refine the idle state
selection in case the previous long-term trends have not been
followed recently and a new trend appears to be forming.  That is
done by computing the average of the most recent idle duration
values falling below the time till the next timer event ("sleep
length"), provided that they are the majority of the most recent
idle duration values taken into account, and using it as the new
expected idle duration value.

However, idle state selection based on that value may not be optimal,
because the average does not really indicate which of the idle states
with target residencies less than or equal to it is likely to be the
best fit.

Thus, instead of computing the average, make the governor carry out
computations based on the distribution of the most recent idle
duration values among the bins corresponding to different idle
states.  Namely, if the majority of the most recent idle duration
values taken into consideration are less than the current sleep
length (which means that the CPU is likely to wake up early), find
the idle state closest to the "candidate" one "matching" the sleep
length whose target residency is less than or equal to the majority
of the most recent idle duration values that have fallen below the
current sleep length (which means that it is likely to be "shallow
enough" this time).
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      77577558
    • Rafael J. Wysocki's avatar
      cpuidle: teo: Change the main idle state selection logic · c410a9a1
      Rafael J. Wysocki authored 
      Two aspects of the current main idle state selection logic in the
TEO (Timer Events Oriented) cpuidle governor are quite questionable.

First of all, the "hits" and "misses" metrics used by it are only
updated for a given idle state if the time till the next timer event
("sleep length") is between the target residency of that state and
the target residency of the next one.  Consequently, they are likely
to become stale if the sleep length tends to fall outside that
interval which increases the likelihood of subomtimal idle state
selection.

Second, the decision on whether or not to select the idle state
"matching" the sleep length is based on the metrics collected for
that state alone, whereas in principle the metrics collected for
the other idle states should be taken into consideration when that
decision is made.  For example, if the measured idle duration is less
than the target residency of the idle state "matching" the sleep
length, then it is also less than the target residency of any deeper
idle state and that should be taken into account when considering
whether or not to select any of those states, but currently it is
not.

In order to address the above shortcomings, modify the main idle
state selection logic in the TEO governor to take the metrics
collected for all of the idle states into account when deciding
whether or not to select the one "matching" the sleep length.

Moreover, drop the "misses" metric that becomes redundant after the
above change and rename the "early_hits" metric to "intercepts" so
that its role is better reflected by its name (the idea being that
if a CPU wakes up earlier than indicated by the sleep length, then
it must be a result of a non-timer interrupt that "intercepts" the
CPU).

Also rename the states[] array in struct struct teo_cpu to
state_bins[] to avoid confusing it with the states[] array in
struct cpuidle_driver and update the documentation to match the
new code (and make it more comprehensive while at it).
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      c410a9a1
    • Rafael J. Wysocki's avatar
      cpuidle: teo: Cosmetic modification of teo_select() · b18e0de1
      Rafael J. Wysocki authored 
      Initialize local variables in teo_select() where they are declared.

No functional impact.
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      b18e0de1
    • Rafael J. Wysocki's avatar
      cpuidle: teo: Cosmetic modifications of teo_update() · f53cbdab
      Rafael J. Wysocki authored 
      Rename a local variable in teo_update() so that its purpose is better
reflected by its name and use one more local variable in the loop
over the CPU idle states in that function to make the code somewhat
easier to read.

No functional impact.
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      f53cbdab
  5. 09 Jun, 2021 1 commit
    • Chen Yu's avatar
      intel_idle: Adjust the SKX C6 parameters if PC6 is disabled · 64233338
      Chen Yu authored 
      Because cpuidle assumes worst-case C-state parameters, PC6 parameters
are used for describing C6, which is worst-case for requesting CC6.
When PC6 is enabled, this is appropriate. But if PC6 is disabled
in the BIOS, the exit latency and target residency should be adjusted
accordingly.

Exit latency:
Previously the C6 exit latency was measured as the PC6 exit latency.
With PC6 disabled, the C6 exit latency should be the one of CC6.

Target residency:
With PC6 disabled, the idle duration within [CC6, PC6) would make the
idle governor choose C1E over C6. This would cause low energy-efficiency.
We should lower the bar to request C6 when PC6 is disabled.

To fill this gap, check if PC6 is disabled in the BIOS in the
MSR_PKG_CST_CONFIG_CONTROL(0xe2) register. If so, use the CC6 exit latency
for C6 and set target_residency to 3 times of the new exit latency. [This
is consistent with how intel_idle driver uses _CST to calculate the
target_residency.] As a result, the OS would be more likely to choose C6
over C1E when PC6 is disabled, which is reasonable, because if C6 is
enabled, it implies that the user cares about energy, so choosing C6 more
frequently makes sense.

The new CC6 exit latency of 92us was measured with wult[1] on SKX via NIC
wakeup as the 99.99th percentile. Also CLX and CPX both have the same CPU
model number as SkX, but their CC6 exit latencies are similar to the SKX
one, 96us and 89us respectively, so reuse the SKX value for them.

There is a concern that it might be better to use a more generic approach
instead of optimizing every platform. However, if the required code
complexity and different PC6 bit interpretation on different platforms
are taken into account, tuning the code per platform seems to be an
acceptable tradeoff.

Link: https://intel.github.io/wult/ # [1]
Suggested-by: default avatarLen Brown <len.brown@intel.com>
Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
Reviewed-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      64233338
  7. 06 Jun, 2021 11 commits
    • Linus Torvalds's avatar
      Linux 5.13-rc5 · 614124be
      Linus Torvalds authored
      614124be
    • Linus Torvalds's avatar
      Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi · 90d56a3d
      Linus Torvalds authored 
      Pull SCSI fixes from James Bottomley:
 "Five small and fairly minor fixes, all in drivers"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: scsi_devinfo: Add blacklist entry for HPE OPEN-V
  scsi: ufs: ufs-mediatek: Fix HCI version in some platforms
  scsi: qedf: Do not put host in qedf_vport_create() unconditionally
  scsi: lpfc: Fix failure to transmit ABTS on FC link
  scsi: target: core: Fix warning on realtime kernels
      90d56a3d
    • Linus Torvalds's avatar
      Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 · 20e41d9b
      Linus Torvalds authored 
      Pull ext4 fixes from Ted Ts'o:
 "Miscellaneous ext4 bug fixes"

* tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: Only advertise encrypted_casefold when encryption and unicode are enabled
  ext4: fix no-key deletion for encrypt+casefold
  ext4: fix memory leak in ext4_fill_super
  ext4: fix fast commit alignment issues
  ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed
  ext4: fix accessing uninit percpu counter variable with fast_commit
  ext4: fix memory leak in ext4_mb_init_backend on error path.
      20e41d9b
    • Linus Torvalds's avatar
      Merge tag 'arm-soc-fixes-v5.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc · decad3e1
      Linus Torvalds authored 
      Pull ARM SoC fixes from Olof Johansson:
 "A set of fixes that have been coming in over the last few weeks, the
  usual mix of fixes:

   - DT fixups for TI K3

   - SATA drive detection fix for TI DRA7

   - Power management fixes and a few build warning removals for OMAP

   - OP-TEE fix to use standard API for UUID exporting

   - DT fixes for a handful of i.MX boards

  And a few other smaller items"

* tag 'arm-soc-fixes-v5.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (29 commits)
  arm64: meson: select COMMON_CLK
  soc: amlogic: meson-clk-measure: remove redundant dev_err call in meson_msr_probe()
  ARM: OMAP1: ams-delta: remove unused function ams_delta_camera_power
  bus: ti-sysc: Fix flakey idling of uarts and stop using swsup_sidle_act
  ARM: dts: imx: emcon-avari: Fix nxp,pca8574 #gpio-cells
  ARM: dts: imx7d-pico: Fix the 'tuning-step' property
  ARM: dts: imx7d-meerkat96: Fix the 'tuning-step' property
  arm64: dts: freescale: sl28: var1: fix RGMII clock and voltage
  arm64: dts: freescale: sl28: var4: fix RGMII clock and voltage
  ARM: imx: pm-imx27: Include "common.h"
  arm64: dts: zii-ultra: fix 12V_MAIN voltage
  arm64: dts: zii-ultra: remove second GEN_3V3 regulator instance
  arm64: dts: ls1028a: fix memory node
  bus: ti-sysc: Fix am335x resume hang for usb otg module
  ARM: OMAP2+: Fix build warning when mmc_omap is not built
  ARM: OMAP1: isp1301-omap: Add missing gpiod_add_lookup_table function
  ARM: OMAP1: Fix use of possibly uninitialized irq variable
  optee: use export_uuid() to copy client UUID
  arm64: dts: ti: k3*: Introduce reg definition for interrupt routers
  arm64: dts: ti: k3-am65|j721e|am64: Map the dma / navigator subsystem via explicit ranges
  ...
      decad3e1
    • Linus Torvalds's avatar
      Merge tag 'powerpc-5.13-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · bd7b12aa
      Linus Torvalds authored 
      Pull powerpc fixes from Michael Ellerman:
 "Fix our KVM reverse map real-mode handling since we enabled huge
  vmalloc (in some configurations).

  Revert a recent change to our IOMMU code which broke some devices.

  Fix KVM handling of FSCR on P7/P8, which could have possibly let a
  guest crash it's Qemu.

  Fix kprobes validation of prefixed instructions across page boundary.

  Thanks to Alexey Kardashevskiy, Christophe Leroy, Fabiano Rosas,
  Frederic Barrat, Naveen N. Rao, and Nicholas Piggin"

* tag 'powerpc-5.13-5' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  Revert "powerpc/kernel/iommu: Align size for IOMMU_PAGE_SIZE() to save TCEs"
  KVM: PPC: Book3S HV: Save host FSCR in the P7/8 path
  powerpc: Fix reverse map real-mode address lookup with huge vmalloc
  powerpc/kprobes: Fix validation of prefixed instructions across page boundary
      bd7b12aa
    • Linus Torvalds's avatar
      Merge tag 'x86_urgent_for_v5.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 773ac53b
      Linus Torvalds authored 
      Pull x86 fixes from Borislav Petkov:
 "A bunch of x86/urgent stuff accumulated for the last two weeks so
  lemme unload it to you.

  It should be all totally risk-free, of course. :-)

   - Fix out-of-spec hardware (1st gen Hygon) which does not implement
     MSR_AMD64_SEV even though the spec clearly states so, and check
     CPUID bits first.

   - Send only one signal to a task when it is a SEGV_PKUERR si_code
     type.

   - Do away with all the wankery of reserving X amount of memory in the
     first megabyte to prevent BIOS corrupting it and simply and
     unconditionally reserve the whole first megabyte.

   - Make alternatives NOP optimization work at an arbitrary position
     within the patched sequence because the compiler can put
     single-byte NOPs for alignment anywhere in the sequence (32-bit
     retpoline), vs our previous assumption that the NOPs are only
     appended.

   - Force-disable ENQCMD[S] instructions support and remove
     update_pasid() because of insufficient protection against FPU state
     modification in an interrupt context, among other xstate horrors
     which are being addressed at the moment. This one limits the
     fallout until proper enablement.

   - Use cpu_feature_enabled() in the idxd driver so that it can be
     build-time disabled through the defines in disabled-features.h.

   - Fix LVT thermal setup for SMI delivery mode by making sure the APIC
     LVT value is read before APIC initialization so that softlockups
     during boot do not happen at least on one machine.

   - Mark all legacy interrupts as legacy vectors when the IO-APIC is
     disabled and when all legacy interrupts are routed through the PIC"

* tag 'x86_urgent_for_v5.13-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/sev: Check SME/SEV support in CPUID first
  x86/fault: Don't send SIGSEGV twice on SEGV_PKUERR
  x86/setup: Always reserve the first 1M of RAM
  x86/alternative: Optimize single-byte NOPs at an arbitrary position
  x86/cpufeatures: Force disable X86_FEATURE_ENQCMD and remove update_pasid()
  dmaengine: idxd: Use cpu_feature_enabled()
  x86/thermal: Fix LVT thermal setup for SMI delivery mode
  x86/apic: Mark _all_ legacy interrupts when IO/APIC is missing
      773ac53b
    • Daniel Rosenberg's avatar
      ext4: Only advertise encrypted_casefold when encryption and unicode are enabled · e71f99f2
      Daniel Rosenberg authored 
      Encrypted casefolding is only supported when both encryption and
casefolding are both enabled in the config.

Fixes: 471fbbea ("ext4: handle casefolding with encryption")
Cc: stable@vger.kernel.org # 5.13+
Signed-off-by: default avatarDaniel Rosenberg <drosen@google.com>
Link: https://lore.kernel.org/r/20210603094849.314342-1-drosen@google.comSigned-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      e71f99f2
    • Daniel Rosenberg's avatar
      ext4: fix no-key deletion for encrypt+casefold · 63e7f128
      Daniel Rosenberg authored 
      commit 471fbbea ("ext4: handle casefolding with encryption") is
missing a few checks for the encryption key which are needed to
support deleting enrypted casefolded files when the key is not
present.

This bug made it impossible to delete encrypted+casefolded directories
without the encryption key, due to errors like:

    W         : EXT4-fs warning (device vdc): __ext4fs_dirhash:270: inode #49202: comm Binder:378_4: Siphash requires key

Repro steps in kvm-xfstests test appliance:
      mkfs.ext4 -F -E encoding=utf8 -O encrypt /dev/vdc
      mount /vdc
      mkdir /vdc/dir
      chattr +F /vdc/dir
      keyid=$(head -c 64 /dev/zero | xfs_io -c add_enckey /vdc | awk '{print $NF}')
      xfs_io -c "set_encpolicy $keyid" /vdc/dir
      for i in `seq 1 100`; do
          mkdir /vdc/dir/$i
      done
      xfs_io -c "rm_enckey $keyid" /vdc
      rm -rf /vdc/dir # fails with the bug

Fixes: 471fbbea ("ext4: handle casefolding with encryption")
Signed-off-by: default avatarDaniel Rosenberg <drosen@google.com>
Link: https://lore.kernel.org/r/20210522004132.2142563-1-drosen@google.comSigned-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      63e7f128
    • Alexey Makhalov's avatar
      ext4: fix memory leak in ext4_fill_super · afd09b61
      Alexey Makhalov authored 
      Buffer head references must be released before calling kill_bdev();
otherwise the buffer head (and its page referenced by b_data) will not
be freed by kill_bdev, and subsequently that bh will be leaked.

If blocksizes differ, sb_set_blocksize() will kill current buffers and
page cache by using kill_bdev(). And then super block will be reread
again but using correct blocksize this time. sb_set_blocksize() didn't
fully free superblock page and buffer head, and being busy, they were
not freed and instead leaked.

This can easily be reproduced by calling an infinite loop of:

  systemctl start <ext4_on_lvm>.mount, and
  systemctl stop <ext4_on_lvm>.mount

... since systemd creates a cgroup for each slice which it mounts, and
the bh leak get amplified by a dying memory cgroup that also never
gets freed, and memory consumption is much more easily noticed.

Fixes: ce40733c ("ext4: Check for return value from sb_set_blocksize")
Fixes: ac27a0ec ("ext4: initial copy of files from ext3")
Link: https://lore.kernel.org/r/20210521075533.95732-1-amakhalov@vmware.comSigned-off-by: default avatarAlexey Makhalov <amakhalov@vmware.com>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
      afd09b61
    • Harshad Shirwadkar's avatar
      ext4: fix fast commit alignment issues · a7ba36bc
      Harshad Shirwadkar authored 
      Fast commit recovery data on disk may not be aligned. So, when the
recovery code reads it, this patch makes sure that fast commit info
found on-disk is first memcpy-ed into an aligned variable before
accessing it. As a consequence of it, we also remove some macros that
could resulted in unaligned accesses.

Cc: stable@kernel.org
Fixes: 8016e29f ("ext4: fast commit recovery path")
Signed-off-by: default avatarHarshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20210519215920.2037527-1-harshads@google.comSigned-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      a7ba36bc
    • Ye Bin's avatar
      ext4: fix bug on in ext4_es_cache_extent as ext4_split_extent_at failed · 082cd4ec
      Ye Bin authored 
      We got follow bug_on when run fsstress with injecting IO fault:
[130747.323114] kernel BUG at fs/ext4/extents_status.c:762!
[130747.323117] Internal error: Oops - BUG: 0 [#1] SMP
......
[130747.334329] Call trace:
[130747.334553]  ext4_es_cache_extent+0x150/0x168 [ext4]
[130747.334975]  ext4_cache_extents+0x64/0xe8 [ext4]
[130747.335368]  ext4_find_extent+0x300/0x330 [ext4]
[130747.335759]  ext4_ext_map_blocks+0x74/0x1178 [ext4]
[130747.336179]  ext4_map_blocks+0x2f4/0x5f0 [ext4]
[130747.336567]  ext4_mpage_readpages+0x4a8/0x7a8 [ext4]
[130747.336995]  ext4_readpage+0x54/0x100 [ext4]
[130747.337359]  generic_file_buffered_read+0x410/0xae8
[130747.337767]  generic_file_read_iter+0x114/0x190
[130747.338152]  ext4_file_read_iter+0x5c/0x140 [ext4]
[130747.338556]  __vfs_read+0x11c/0x188
[130747.338851]  vfs_read+0x94/0x150
[130747.339110]  ksys_read+0x74/0xf0

This patch's modification is according to Jan Kara's suggestion in:
https://patchwork.ozlabs.org/project/linux-ext4/patch/20210428085158.3728201-1-yebin10@huawei.com/
"I see. Now I understand your patch. Honestly, seeing how fragile is trying
to fix extent tree after split has failed in the middle, I would probably
go even further and make sure we fix the tree properly in case of ENOSPC
and EDQUOT (those are easily user triggerable).  Anything else indicates a
HW problem or fs corruption so I'd rather leave the extent tree as is and
don't try to fix it (which also means we will not create overlapping
extents)."

Cc: stable@kernel.org
Signed-off-by: default avatarYe Bin <yebin10@huawei.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20210506141042.3298679-1-yebin10@huawei.comSigned-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      082cd4ec
  9. 05 Jun, 2021 22 commits
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