Enable CONFIG_SCOM_DEBUGFS for ppc64el kernels

[Benjamin Herrenschmidt]

[Impact]
Please enable CONFIG_SCOM_DEBUGFS for ppc64el kernels, this creates some new files in debugfs that allow userspace (root only) to access the P7/P8 chip internal XSCOM bus, which is needed for various debug/diag/mfg tools. There should be no runtime impact on performance or stability by just enabling that option.

[Test Case]
 ls /sys/kernel/debug/powerpc/scom/*

[Fix]
Enable CONFIG_SCOM_DEBUGFS for powerpc/powerpc64-smp and ppc64el/generic arch/flavors.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1395855

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Adam Conrad (adconrad)]

This should be enabled for ppc64-smp on powerpc as well, for the same reasons.

[Chris J Arges (arges)]

posted patches to <email address hidden>

[Brad Figg (brad-figg)]

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-trusty' to 'verification-done-trusty'.

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 https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Brad Figg (brad-figg)]

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-utopic' to 'verification-done-utopic'.

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 https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Benjamin Herrenschmidt (benh-kernel)]

Hrm, I can't seem to get that updated kernel, I've added utopic-proposed to my sources list and done apt-get install linux-image/utopic-proposed (or various other variants of "linux") to no avail... what's up ?

[Benjamin Herrenschmidt (benh-kernel)]

Regarding trusty, I don't have a trusty machine at hand, if anybody around does, check for the xscom nodes being present in /sys/kernel/debug/powerpc/

[Chris J Arges (arges)]

Benh,

You can find the builds to download manually by going here:
https://launchpad.net/ubuntu/+source/linux

If you click on the Utopic/Proposed tab, you can see a ppc64el arch build and download them from here:
https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/6593609

Anyway, I've verified with Utopic; and I can do the same with Trusty soon.

[Chris J Arges (arges)]

Also verified on 3.13.0-41:

ls /sys/kernel/debug/powerpc/scom/*
/sys/kernel/debug/powerpc/scom/00000000:
access devspec

/sys/kernel/debug/powerpc/scom/00000001:
access devspec

/sys/kernel/debug/powerpc/scom/00000010:
access devspec

/sys/kernel/debug/powerpc/scom/00000011:
access devspec

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.13.0-41.70

---------------
linux (3.13.0-41.70) trusty; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1396112

  [ Chris J Arges ]

  * [Config] CONFIG_SCOM_DEBUGFS=y for powerpc/powerpc64-smp
    ppc64el/generic
    - LP: #1395855

  [ Upstream Kernel Changes ]

  * Revert "KVM: x86: Handle errors when RIP is set during far jumps"
    - LP: #1393477
  * Revert "net/macb: add pinctrl consumer support"
    - LP: #1393477
  * Revert "iwlwifi: mvm: treat EAPOLs like mgmt frames wrt rate"
    - LP: #1393477
  * Revert "ipmi: simplify locking"
    - LP: #1383921
  * ACPI / blacklist: add Win8 OSI quirks for some Dell laptop models
    - LP: #1339456
  * ACPI / battery: Accelerate battery resume callback
    - LP: #838543
  * tools: cpu-hotplug fix unexpected operator error
  * netlink: reset network header before passing to taps
    - LP: #1393477
  * rtnetlink: fix VF info size
    - LP: #1393477
  * myri10ge: check for DMA mapping errors
    - LP: #1393477
  * tcp: don't use timestamp from repaired skb-s to calculate RTT (v2)
    - LP: #1393477
  * sit: Fix ipip6_tunnel_lookup device matching criteria
    - LP: #1393477
  * tcp: fix tcp_release_cb() to dispatch via address family for
    mtu_reduced()
    - LP: #1393477
  * tcp: fix ssthresh and undo for consecutive short FRTO episodes
    - LP: #1393477
  * packet: handle too big packets for PACKET_V3
    - LP: #1393477
  * openvswitch: fix panic with multiple vlan headers
    - LP: #1393477
  * vxlan: fix incorrect initializer in union vxlan_addr
    - LP: #1393477
  * l2tp: fix race while getting PMTU on PPP pseudo-wire
    - LP: #1393477
  * bonding: fix div by zero while enslaving and transmitting
    - LP: #1393477
  * bridge: Check if vlan filtering is enabled only once.
    - LP: #1393477
  * bridge: Fix br_should_learn to check vlan_enabled
    - LP: #1393477
  * net: allow macvlans to move to net namespace
    - LP: #1393477
  * tg3: Work around HW/FW limitations with vlan encapsulated frames
    - LP: #1393477
  * tg3: Allow for recieve of full-size 8021AD frames
    - LP: #1393477
  * xfrm: Generate blackhole routes only from route lookup functions
    - LP: #1393477
  * xfrm: Generate queueing routes only from route lookup functions
    - LP: #1393477
  * macvtap: Fix race between device delete and open.
    - LP: #1393477
  * gro: fix aggregation for skb using frag_list
    - LP: #1393477
  * hyperv: Fix a bug in netvsc_start_xmit()
    - LP: #1393477
  * ip6_gre: fix flowi6_proto value in xmit path
    - LP: #1393477
  * team: avoid race condition in scheduling delayed work
    - LP: #1393477
  * sctp: handle association restarts when the socket is closed.
    - LP: #1393477
  * tcp: fixing TLP's FIN recovery
    - LP: #1393477
  * sparc64: Do not disable interrupts in nmi_cpu_busy()
    - LP: #1393477
  * sparc64: Fix pcr_ops initialization and usage bugs.
    - LP: #1393477
  * sparc32: dma_alloc_coherent must honour gfp flags
    - LP: #1393477
  * sparc64: sun4v TLB error power off events
    - LP: #1393477
  * sparc64: Fix corrupted thread fault code.
    - LP: #1393477
  * sparc64: find_node adjustment
   ...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.16.0-26.35

---------------
linux (3.16.0-26.35) utopic; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1398118

  [ Upstream Kernel Changes ]

  * Revert "drm/nouveau: punt fbcon resume out to a workqueue"
  * Revert "drm/nouveau/kms: take more care when pulling down accelerated
    fbcon"

linux (3.16.0-26.34) utopic; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1395892

  [ Chris J Arges ]

  * [Config] CONFIG_SCOM_DEBUGFS=y for powerpc/powerpc64-smp ppc64el/generic
    - LP: #1395855

  [ Tim Gardner ]

  * [Config] CONFIG_GENWQE_PLATFORM_ERROR_RECOVERY=1 for powerpc/ppc64el
    - LP: #1392021

  [ Upstream Kernel Changes ]

  * Revert "usb: dwc3: dwc3-omap: Disable/Enable only wrapper interrupts in
    prepare/complete"
    - LP: #1393401
  * Revert "iwlwifi: mvm: treat EAPOLs like mgmt frames wrt rate"
    - LP: #1393401
  * Revert "block: all blk-mq requests are tagged"
    - LP: #1393401
  * ACPI / blacklist: add Win8 OSI quirks for some Dell laptop models
    - LP: #1339456
  * PCI: Remove "no hotplug settings from platform" warning
    - LP: #1390182
  * drm/nouveau/kms: take more care when pulling down accelerated fbcon
    - LP: #1386695
  * drm/nouveau: punt fbcon resume out to a workqueue
    - LP: #1386695
  * drm/tilcdc: Fix the error path in tilcdc_load()
    - LP: #1393401
  * builddeb: put the dbg files into the correct directory
    - LP: #1393401
  * switch iov_iter_get_pages() to passing maximal number of pages
    - LP: #1393401
  * fuse: honour max_read and max_write in direct_io mode
    - LP: #1393401
  * usb: phy: return -ENODEV on failure of try_module_get
    - LP: #1393401
  * PM / clk: Fix crash in clocks management code if !CONFIG_PM_RUNTIME
    - LP: #1393401
  * rt2x00: support Ralink 5362.
    - LP: #1393401
  * wireless: rt2x00: add new rt2800usb devices
    - LP: #1393401
  * NFS: Fix /proc/fs/nfsfs/servers and /proc/fs/nfsfs/volumes
    - LP: #1393401
  * nfs: fix duplicate proc entries
    - LP: #1393401
  * ext4: check EA value offset when loading
    - LP: #1393401
  * jbd2: free bh when descriptor block checksum fails
    - LP: #1393401
  * ext4: don't check quota format when there are no quota files
    - LP: #1393401
  * target: Fix queue full status NULL pointer for SCF_TRANSPORT_TASK_SENSE
    - LP: #1393401
  * vfs: fix data corruption when blocksize < pagesize for mmaped data
    - LP: #1393401
  * ext4: fix mmap data corruption when blocksize < pagesize
    - LP: #1393401
  * ext4: grab missed write_count for EXT4_IOC_SWAP_BOOT
    - LP: #1393401
  * qla_target: don't delete changed nacls
    - LP: #1393401
  * target: Fix APTPL metadata handling for dynamic MappedLUNs
    - LP: #1393401
  * iser-target: Disable TX completion interrupt coalescing
    - LP: #1393401
  * ext4: don't orphan or truncate the boot loader inode
    - LP: #1393401
  * ext4: add ext4_iget_normal() which is to be used for dir tree lookups
    - LP: #1393401
  * ext4: fix reservation overflow in ext4_da_write_begin
    - LP: #1393401
  * ext4: Replace open coded mdata csum feature to helper function
    - LP: #1393401
  * ext4: move error ...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.16.0-28.38

---------------
linux (3.16.0-28.38) utopic; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1401966

  [ Upstream Kernel Changes ]

  * net: skb_fclone_busy() needs to detect orphaned skb
    - LP: #1401079
 -- Brad Figg <email address hidden> Fri, 12 Dec 2014 08:35:42 -0800