Fix /proc/cpuinfo revision for POWER9 DD2

Bug #1698844 reported by bugproxy on 2017-06-19
This bug affects 1 person
Affects Status Importance Assigned to Milestone
The Ubuntu-power-systems project
Canonical Kernel Team
linux (Ubuntu)
Ubuntu on IBM Power Systems Bug Triage
Ubuntu on IBM Power Systems Bug Triage

Bug Description

== Comment: #0 - Breno Leitao <email address hidden> - 2017-06-19 09:44:36 ==
The P9 PVR bits 12-15 don't indicate a revision but instead different
chip configurations. From BookIV we have:
   Bits Configuration
    0 : Scale out 12 cores
    1 : Scale out 24 cores
    2 : Scale up 12 cores
    3 : Scale up 24 cores

DD1 doesn't use this but DD2 does. Linux will mostly use the "Scale
out 24 core" configuration (ie. SMT4 not SMT8) which results in a PVR
of 0x004e1200. The reported revision in /proc/cpuinfo is hence
reported incorrectly as "18.0".

This patch fixes this to mask off only the relevant bits for the major
revision (ie. bits 8-11) for POWER9.

Please cherry pick:

bugproxy (bugproxy) on 2017-06-19
tags: added: architecture-ppc64le bugnameltc-155824 severity-medium targetmilestone-inin16043
Changed in ubuntu:
assignee: nobody → Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
affects: ubuntu → linux (Ubuntu)
Changed in ubuntu-power-systems:
assignee: nobody → Canonical Kernel Team (canonical-kernel-team)
Seth Forshee (sforshee) on 2017-06-20
Changed in linux (Ubuntu Artful):
status: New → Fix Committed
Stefan Bader (smb) on 2017-06-21
Changed in linux (Ubuntu Zesty):
importance: Undecided → Medium
status: New → Fix Committed
Changed in ubuntu-power-systems:
status: New → Fix Committed
importance: Undecided → Medium

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-zesty' to 'verification-done-zesty'. If the problem still exists, change the tag 'verification-needed-zesty' to 'verification-failed-zesty'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See for documentation how to enable and use -proposed. Thank you!

tags: added: verification-needed-zesty

------- Comment From <email address hidden> 2017-07-10 09:08 EDT-------
Tested on our side. Thanks!

tags: added: verification-done-zesty
removed: verification-needed-zesty
Launchpad Janitor (janitor) wrote :
Download full text (4.0 KiB)

This bug was fixed in the package linux - 4.11.0-10.15

linux (4.11.0-10.15) artful; urgency=low

  * linux: 4.11.0-10.15 -proposed tracker (LP: #1701271)

  * Artful update to v4.11.8 stable release (LP: #1701269)
    - clk: sunxi-ng: a31: Correct lcd1-ch1 clock register offset
    - clk: sunxi-ng: v3s: Fix usb otg device reset bit
    - clk: sunxi-ng: sun5i: Fix ahb_bist_clk definition
    - xen/blkback: fix disconnect while I/Os in flight
    - xen-blkback: don't leak stack data via response ring
    - ALSA: firewire-lib: Fix stall of process context at packet error
    - ALSA: pcm: Don't treat NULL chmap as a fatal error
    - ALSA: hda - Add Coffelake PCI ID
    - ALSA: hda - Apply quirks to Broxton-T, too
    - fs/exec.c: account for argv/envp pointers
    - powerpc/perf: Fix oops when kthread execs user process
    - autofs: sanity check status reported with AUTOFS_DEV_IOCTL_FAIL
    - fs/dax.c: fix inefficiency in dax_writeback_mapping_range()
    - lib/cmdline.c: fix get_options() overflow while parsing ranges
    - perf/x86/intel: Add 1G DTLB load/store miss support for SKL
    - perf probe: Fix probe definition for inlined functions
    - KVM: x86: fix singlestepping over syscall
    - KVM: MIPS: Fix maybe-uninitialized build failure
    - KVM: s390: gaccess: fix real-space designation asce handling for gmap
    - KVM: PPC: Book3S HV: Cope with host using large decrementer mode
    - KVM: PPC: Book3S HV: Preserve userspace HTM state properly
    - KVM: PPC: Book3S HV: Ignore timebase offset on POWER9 DD1
    - KVM: PPC: Book3S HV: Context-switch EBB registers properly
    - KVM: PPC: Book3S HV: Restore critical SPRs to host values on guest exit
    - KVM: PPC: Book3S HV: Save/restore host values of debug registers
    - CIFS: Improve readdir verbosity
    - CIFS: Fix some return values in case of error in 'crypt_message'
    - cxgb4: notify uP to route ctrlq compl to rdma rspq
    - HID: Add quirk for Dell PIXART OEM mouse
    - random: silence compiler warnings and fix race
    - signal: Only reschedule timers on signals timers have sent
    - powerpc/kprobes: Pause function_graph tracing during jprobes handling
    - powerpc/64s: Handle data breakpoints in Radix mode
    - Input: i8042 - add Fujitsu Lifebook AH544 to notimeout list
    - brcmfmac: add parameter to pass error code in firmware callback
    - brcmfmac: use firmware callback upon failure to load
    - brcmfmac: unbind all devices upon failure in firmware callback
    - time: Fix clock->read(clock) race around clocksource changes
    - time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting
    - arm64/vdso: Fix nsec handling for CLOCK_MONOTONIC_RAW
    - target: Fix kref->refcount underflow in transport_cmd_finish_abort
    - iscsi-target: Fix delayed logout processing greater than
    - iscsi-target: Reject immediate data underflow larger than SCSI transfer
    - drm/radeon: add a PX quirk for another K53TK variant
    - drm/radeon: add a quirk for Toshiba Satellite L20-183
    - drm/amdgpu/atom: fix ps allocation size for EnableDispPowerGating
    - drm/amdgpu: adjust default display clock


Changed in linux (Ubuntu Artful):
status: Fix Committed → Fix Released
Launchpad Janitor (janitor) wrote :
Download full text (8.1 KiB)

This bug was fixed in the package linux - 4.10.0-28.32

linux (4.10.0-28.32) zesty; urgency=low

  * linux: 4.10.0-28.32 -proposed tracker (LP: #1701013)

  * KILLER1435-S[0489:e0a2] BT cannot search BT 4.0 device (LP: #1699651)
    - Bluetooth: btusb: Add support for 0489:e0a2 QCA_ROME device

  * aacraid driver may return uninitialized stack data to userspace
    (LP: #1700077)
    - SAUCE: scsi: aacraid: Don't copy uninitialized stack memory to userspace

  * CVE-2017-9605
    - drm/vmwgfx: Make sure backup_handle is always valid

  * CVE-2017-1000380
    - ALSA: timer: Fix race between read and ioctl
    - ALSA: timer: Fix missing queue indices reset at SNDRV_TIMER_IOCTL_SELECT

  * XDP eBPF programs fail to verify on Zesty ppc64el (LP: #1699627)
    - [Config] ppc64el: build for Power8 not Power7

  * AACRAID for power9 platform (LP: #1689980)
    - scripts/spelling.txt: add "therfore" pattern and fix typo instances
    - scsi: aacraid: fix PCI error recovery path
    - scsi: aacraid: pci_alloc_consistent() failures on ARM64
    - scsi: aacraid: Remove __GFP_DMA for raw srb memory
    - scsi: aacraid: Fix DMAR issues with iommu=pt
    - scsi: aacraid: Added 32 and 64 queue depth for arc natives
    - scsi: aacraid: Set correct Queue Depth for HBA1000 RAW disks
    - scsi: aacraid: Remove reset support from check_health
    - scsi: aacraid: Change wait time for fib completion
    - scsi: aacraid: Log count info of scsi cmds before reset
    - scsi: aacraid: Print ctrl status before eh reset
    - scsi: aacraid: Using single reset mask for IOP reset
    - scsi: aacraid: Rework IOP reset
    - scsi: aacraid: Add periodic checks to see IOP reset status
    - scsi: aacraid: Rework SOFT reset code
    - scsi: aacraid: Rework aac_src_restart
    - scsi: aacraid: Use correct function to get ctrl health
    - scsi: aacraid: Make sure ioctl returns on controller reset
    - scsi: aacraid: Enable ctrl reset for both hba and arc
    - scsi: aacraid: Add reset debugging statements
    - scsi: aacraid: Remove reference to Series-9
    - scsi: aacraid: Update driver version to 50834

  * arm64 kernel crashdump support (LP: #1694859)
    - memblock: add memblock_clear_nomap()
    - memblock: add memblock_cap_memory_range()
    - arm64: limit memory regions based on DT property, usable-memory-range
    - arm64: kdump: reserve memory for crash dump kernel
    - arm64: mm: add set_memory_valid()
    - arm64: mm: use phys_addr_t instead of unsigned long in __map_memblock
    - arm64: kdump: protect crash dump kernel memory
    - arm64: hibernate: preserve kdump image around hibernation
    - arm64: kdump: implement machine_crash_shutdown()
    - arm64: kdump: add VMCOREINFO's for user-space tools
    - [Config] CONFIG_CRASH_DUMP=y on arm64
    - arm64: kdump: provide /proc/vmcore file
    - Documentation: kdump: describe arm64 port
    - Documentation: dt: chosen properties for arm64 kdump
    - efi/libstub/arm*: Set default address and size cells values for an empty dtb

  * hibmc driver does not include "pci:" prefix in bus ID (LP: #1698700)
    - SAUCE: drm: hibmc: Use set_busid function from drm core

  * Processes in "D" state due to za...


Changed in linux (Ubuntu Zesty):
status: Fix Committed → Fix Released
Changed in ubuntu-power-systems:
status: Fix Committed → Fix Released
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