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[Bug 1728098] Re: [kernel] tty/hvc: Use opal irqchip interface if available

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Frank Heimes <1728098@xxxxxxxxxxxxxxxxxx>
Date: Mon, 11 Dec 2017 14:52:10 -0000
Reply-to: Bug 1728098 <1728098@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Changed in: linux (Ubuntu)
       Status: In Progress => Fix Released

** Changed in: ubuntu-power-systems
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1728098

Title:
  [kernel] tty/hvc: Use opal irqchip interface if available

Status in The Ubuntu-power-systems project:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:

  == SRU Justification ==
  This bug is fixed by commit 00dab8187e18.  The commit updates the hvc
  driver to use the OPAL irqchip if made available by the running firmware.
  If it is not present, the driver falls back to the existing OPAL event number.   

  Commit 00dab8187e18 was added to mainline is v4.8-rc1, so it is not needed in 
  releases newer than Xenial.  The commit is a clean cherry pick in Xenial.

  
  == Fix ==
  commit 00dab8187e182da41122f66c207707b192509df4
  Author: Sam Mendoza-Jonas <sam@xxxxxxxxxxxxxxxx>
  Date:   Mon Jul 11 13:38:58 2016 +1000

      tty/hvc: Use opal irqchip interface if available

  
  == Regression Potential ==
  This change is specific to the hvc driver and has been in mainline since v4.8-rc1
  without any issues reported.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug reporter.
  The bug reporter states the test kernel resolved the bug.

  
  ---Problem Description---
  Please backport console irq patch .

  commit 00dab8187e182da41122f66c207707b192509df4
  Author: Sam Mendoza-Jonas <sam@xxxxxxxxxxxxxxxx>
  Date:   Mon Jul 11 13:38:58 2016 +1000

      tty/hvc: Use opal irqchip interface if available

      Update the hvc driver to use the OPAL irqchip if made available by the
      running firmware. If it is not present, the driver falls back to the
      existing OPAL event number.

      Signed-off-by: Samuel Mendoza-Jonas <sam@xxxxxxxxxxxxxxxx>
      Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>

  ---uname output---
  Linux tul217p1 4.4.0-98-generic #121-Ubuntu SMP Tue Oct 10 14:23:01 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux

  Machine Type = FSP based PowerNV system

  Canonical,

  We need this patch in 16.04 GA 4.4 kernel. This fix will avoid the
  following error:

  Oct 19 22:15:07 tul217p1 kernel: sched: RT throttling activated
  Oct 19 22:15:49 tul217p1 kernel: INFO: rcu_sched self-detected stall on CPU
  Oct 19 22:15:49 tul217p1 kernel:        21-...: (85 GPs behind) idle=d29/140000000000002/0 softirq=26316/26316 fqs=4417
  Oct 19 22:15:49 tul217p1 kernel:         (t=5250 jiffies g=30019 c=30018 q=20591)
  Oct 19 22:15:49 tul217p1 kernel: Call Trace:
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f110] [c0000000000fcbe0] sched_show_task+0xe0/0x180 (unreliable)
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f180] [c00000000013fcf4] rcu_dump_cpu_stacks+0xe4/0x150
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f1d0] [c000000000145424] rcu_check_callbacks+0x6b4/0x9b0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f300] [c00000000014d288] update_process_times+0x58/0xa0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f330] [c0000000001649b8] tick_sched_handle.isra.6+0x48/0xe0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f370] [c000000000164ab4] tick_sched_timer+0x64/0xd0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f3b0] [c00000000014dd54] __hrtimer_run_queues+0x124/0x450
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f440] [c00000000014ed7c] hrtimer_interrupt+0xec/0x2c0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f500] [c00000000001f5fc] __timer_interrupt+0x8c/0x290
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f550] [c00000000001f9b0] timer_interrupt+0xa0/0xe0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f580] [c0000000000099d8] restore_check_irq_replay+0x54/0x70
  Oct 19 22:15:49 tul217p1 kernel: --- interrupt: 901 at arch_local_irq_restore+0x74/0x90
                                       LR = arch_local_irq_restore+0x74/0x90
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f870] [7fffffffffffffff] 0x7fffffffffffffff (unreliable)
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f890] [c0000000000bf808] __do_softirq+0xd8/0x3e0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f980] [c0000000000bfd88] irq_exit+0xc8/0x100
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f9a0] [c00000000001f9b4] timer_interrupt+0xa4/0xe0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0f9d0] [c0000000000099d8] restore_check_irq_replay+0x54/0x70
  Oct 19 22:15:49 tul217p1 kernel: --- interrupt: 901 at irq_work_queue+0x60/0xd0
                                       LR = irq_work_queue+0xa4/0xd0
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0fcc0] [c0000007f4d0fd00] 0xc0000007f4d0fd00 (unreliable)
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0fcf0] [c000000000076a98] opal_handle_events+0x108/0x130
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0fd40] [c000000000070fc8] kopald+0x78/0x100
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0fd80] [c0000000000e7374] kthread+0x124/0x150
  Oct 19 22:15:49 tul217p1 kernel: [c0000007f4d0fe30] [c000000000009538] ret_from_kernel_thread+0x5c/0xa4
  Oct 19 22:15:54 tul217p1 kernel: NMI watchdog: BUG: soft lockup - CPU#21 stuck for 23s! [kopald:494]
  Oct 19 22:15:54 tul217p1 kernel: Modules linked in: ibmpowernv binfmt_misc ipmi_powernv ipmi_msghandler leds_powernv powernv_rng
  uio_pdrv_genirq uio vmx_crypto nfsd auth_rpcgss nfs_acl lockd ib_iser grace rdma_cm iw_cm sunrpc ib_cm ib_sa ib_mad ib_core ib_
  addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq a
  sync_xor async_tx xor raid6_pq libcrc32c raid1 raid0 multipath linear ipr cxl
  Oct 19 22:15:54 tul217p1 kernel: CPU: 21 PID: 494 Comm: kopald Not tainted 4.4.0-98-generic #121-Ubuntu
  Oct 19 22:15:54 tul217p1 kernel: task: c0000007f4cc3f30 ti: c0000007f4d0c000 task.ti: c0000007f4d0c000
  Oct 19 22:15:54 tul217p1 kernel: NIP: c000000000010964 LR: c000000000010964 CTR: c00000000001f100
  Oct 19 22:15:54 tul217p1 kernel: REGS: c0000007f4d0f5f0 TRAP: 0901   Not tainted  (4.4.0-98-generic)
  Oct 19 22:15:54 tul217p1 kernel: MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 28000824  XER: 20000000
  Oct 19 22:15:54 tul217p1 kernel: CFAR: c000000000009958 SOFTE: 1
                                   GPR00: c0000000000bf808 c0000007f4d0f870 c000000001608300 0000000000000900
                                   GPR04: c0000007fbd40400 0000000000000001 0000000000000018 0000000001f404db
                                   GPR08: 0000000000000000 0000000000000000 c0000007f4d0c000 0000000000000005
                                   GPR12: c00000000006e3c8 c00000000fb4c780
  Oct 19 22:15:54 tul217p1 kernel: NIP [c000000000010964] arch_local_irq_restore+0x74/0x90
  Oct 19 22:15:54 tul217p1 kernel: LR [c000000000010964] arch_local_irq_restore+0x74/0x90
  Oct 19 22:15:54 tul217p1 kernel: Call Trace:
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0f870] [7fffffffffffffff] 0x7fffffffffffffff (unreliable)
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0f890] [c0000000000bf808] __do_softirq+0xd8/0x3e0
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0f980] [c0000000000bfd88] irq_exit+0xc8/0x100
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0f9a0] [c00000000001f9b4] timer_interrupt+0xa4/0xe0
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0f9d0] [c0000000000099d8] restore_check_irq_replay+0x54/0x70
  Oct 19 22:15:54 tul217p1 kernel: --- interrupt: 901 at irq_work_queue+0x60/0xd0
                                       LR = irq_work_queue+0xa4/0xd0
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0fcc0] [c0000007f4d0fd00] 0xc0000007f4d0fd00 (unreliable)
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0fcf0] [c000000000076a98] opal_handle_events+0x108/0x130
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0fd40] [c000000000070fc8] kopald+0x78/0x100
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0fd80] [c0000000000e7374] kthread+0x124/0x150
  Oct 19 22:15:54 tul217p1 kernel: [c0000007f4d0fe30] [c000000000009538] ret_from_kernel_thread+0x5c/0xa4
  Oct 19 22:15:54 tul217p1 kernel: Instruction dump:
  Oct 19 22:15:54 tul217p1 kernel: 994d02ca 2fa30000 409e0024 e92d0020 61298000 7d210164 38210020 e8010010
  Oct 19 22:15:54 tul217p1 kernel: 7c0803a6 4e800020 60420000 4bff186d <60000000> 4bffffe4 60420000 e92d0020
  Oct 19 22:16:39 tul217p1 kernel: INFO: rcu_sched self-detected stall on CPU
  Oct 19 22:16:39 tul217p1 kernel:        16-...: (301 GPs behind) idle=5b5/140000000000002/0 softirq=2284/2284 fqs=4838
  Oct 19 22:16:39 tul217p1 kernel:         (t=5250 jiffies g=30159 c=30158 q=20605)
  Oct 19 22:16:39 tul217p1 kernel: Call Trace:
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f150] [c0000000000fcbe0] sched_show_task+0xe0/0x180 (unreliable)
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f1c0] [c00000000013fcf4] rcu_dump_cpu_stacks+0xe4/0x150
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f210] [c000000000145424] rcu_check_callbacks+0x6b4/0x9b0
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f340] [c00000000014d288] update_process_times+0x58/0xa0
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f370] [c0000000001649b8] tick_sched_handle.isra.6+0x48/0xe0
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f3b0] [c000000000164ab4] tick_sched_timer+0x64/0xd0
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f3f0] [c00000000014dd54] __hrtimer_run_queues+0x124/0x450
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f480] [c00000000014ed7c] hrtimer_interrupt+0xec/0x2c0
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f540] [c00000000001f5fc] __timer_interrupt+0x8c/0x290
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f590] [c00000000001f9b0] timer_interrupt+0xa0/0xe0
  Oct 19 22:16:39 tul217p1 kernel: [c0000007f4d0f5c0] [c0000000000099d8] restore_check_irq_replay+0x54/0x70
  Oct 19 22:16:39 tul217p1 kernel: --- interrupt: 901 at arch_local_irq_restore+0x74/0x90

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