[5.17,106/146] powerpc/time: Always set decrementer in timer_interrupt()

From: Michael Ellerman <mpe@ellerman.id.au>

From: Michael Ellerman <mpe@ellerman.id.au>

[ Upstream commit d2b9be1f4af5cabed1ee5bb341f887f64b1c1669 ]

This is a partial revert of commit 0faf20a1ad16 ("powerpc/64s/interrupt:
Don't enable MSR[EE] in irq handlers unless perf is in use").

Prior to that commit, we always set the decrementer in
timer_interrupt(), to clear the timer interrupt. Otherwise we could end
up continuously taking timer interrupts.

When high res timers are enabled there is no problem seen with leaving
the decrementer untouched in timer_interrupt(), because it will be
programmed via hrtimer_interrupt() -> tick_program_event() ->
clockevents_program_event() -> decrementer_set_next_event().

However with CONFIG_HIGH_RES_TIMERS=n or booting with highres=off, we
see a stall/lockup, because tick_nohz_handler() does not cause a
reprogram of the decrementer, leading to endless timer interrupts.
Example trace:

  [    1.898617][    T7] Freeing initrd memory: 2624K^M
  [   22.680919][    C1] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:^M
  [   22.682281][    C1] rcu:     0-....: (25 ticks this GP) idle=073/0/0x1 softirq=10/16 fqs=1050 ^M
  [   22.682851][    C1]  (detected by 1, t=2102 jiffies, g=-1179, q=476)^M
  [   22.683649][    C1] Sending NMI from CPU 1 to CPUs 0:^M
  [   22.685252][    C0] NMI backtrace for cpu 0^M
  [   22.685649][    C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.16.0-rc2-00185-g0faf20a1ad16 #145^M
  [   22.686393][    C0] NIP:  c000000000016d64 LR: c000000000f6cca4 CTR: c00000000019c6e0^M
  [   22.686774][    C0] REGS: c000000002833590 TRAP: 0500   Not tainted  (5.16.0-rc2-00185-g0faf20a1ad16)^M
  [   22.687222][    C0] MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24000222  XER: 00000000^M
  [   22.688297][    C0] CFAR: c00000000000c854 IRQMASK: 0 ^M
  ...
  [   22.692637][    C0] NIP [c000000000016d64] arch_local_irq_restore+0x174/0x250^M
  [   22.694443][    C0] LR [c000000000f6cca4] __do_softirq+0xe4/0x3dc^M
  [   22.695762][    C0] Call Trace:^M
  [   22.696050][    C0] [c000000002833830] [c000000000f6cc80] __do_softirq+0xc0/0x3dc (unreliable)^M
  [   22.697377][    C0] [c000000002833920] [c000000000151508] __irq_exit_rcu+0xd8/0x130^M
  [   22.698739][    C0] [c000000002833950] [c000000000151730] irq_exit+0x20/0x40^M
  [   22.699938][    C0] [c000000002833970] [c000000000027f40] timer_interrupt+0x270/0x460^M
  [   22.701119][    C0] [c0000000028339d0] [c0000000000099a8] decrementer_common_virt+0x208/0x210^M

Possibly this should be fixed in the lowres timing code, but that would
be a generic change and could take some time and may not backport
easily, so for now make the programming of the decrementer unconditional
again in timer_interrupt() to avoid the stall/lockup.

Fixes: 0faf20a1ad16 ("powerpc/64s/interrupt: Don't enable MSR[EE] in irq handlers unless perf is in use")
Reported-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Link: https://lore.kernel.org/r/20220420141657.771442-1-mpe@ellerman.id.au
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/powerpc/kernel/time.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

Message ID	20220426081753.037463942@linuxfoundation.org
State	New
Headers	show Return-Path: <stable-owner@kernel.org> X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90641C3527E for <stable@archiver.kernel.org>; Tue, 26 Apr 2022 09:08:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346792AbiDZJLu (ORCPT <rfc822;stable@archiver.kernel.org>); Tue, 26 Apr 2022 05:11:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346921AbiDZJJ0 (ORCPT <rfc822;stable@vger.kernel.org>); Tue, 26 Apr 2022 05:09:26 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5520C17ABD7; Tue, 26 Apr 2022 01:49:22 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E7F946149A; Tue, 26 Apr 2022 08:49:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E3924C385A4; Tue, 26 Apr 2022 08:49:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650962961; bh=8KrmE0KfLpZ6Zj6gWZMaFJNNGs1Kvhw+34J7TsZNZJg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wPLr9MAhq3iJld8G1lfNyu8VsLaZKJJfJza+x2fsErd64ZtcsLiy6+UYlyVwLiBKx SzmqUpm62dkrmHkTvxU7CG1OStae3u0lqELEeUjxFwLXbon7Sp8V6i8Z8jj7tWsny/ 0xrPCHb4FNMUFDVd2lBcQcRdDcdVMoR8W0FVA1xQ= From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, stable@vger.kernel.org, Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>, Michael Ellerman <mpe@ellerman.id.au>, Nicholas Piggin <npiggin@gmail.com>, Sasha Levin <sashal@kernel.org> Subject: [PATCH 5.17 106/146] powerpc/time: Always set decrementer in timer_interrupt() Date: Tue, 26 Apr 2022 10:21:41 +0200 Message-Id: <20220426081753.037463942@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081750.051179617@linuxfoundation.org> References: <20220426081750.051179617@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: <stable.vger.kernel.org> X-Mailing-List: stable@vger.kernel.org
Series	None \| expand [5.17,002/146] perf tools: Fix segfault accessing sample_id xyarray [5.17,003/146] drm/amd/display: Only set PSR version when valid [5.17,004/146] block/compat_ioctl: fix range check in BLKGETSIZE [5.17,005/146] gfs2: assign rgrp glock before compute_bitstructs [5.17,006/146] scsi: ufs: core: scsi_get_lba() error fix [5.17,007/146] net/sched: cls_u32: fix netns refcount changes in u32_change() [5.17,008/146] ALSA: usb-audio: Clear MIDI port active flag after draining [5.17,009/146] ALSA: usb-audio: add mapping for MSI MAG X570S Torpedo MAX. [5.17,010/146] ALSA: hda/realtek: Add quirk for Clevo NP70PNP [5.17,011/146] ASoC: atmel: Remove system clock tree configuration for at91sam9g20ek [5.17,012/146] ASoC: topology: Correct error handling in soc_tplg_dapm_widget_create() [5.17,013/146] ASoC: rk817: Use devm_clk_get() in rk817_platform_probe [5.17,014/146] ASoC: msm8916-wcd-digital: Check failure for devm_snd_soc_register_component [5.17,015/146] ASoC: codecs: wcd934x: do not switch off SIDO Buck when codec is in use [5.17,016/146] dmaengine: idxd: fix device cleanup on disable [5.17,017/146] dmaengine: imx-sdma: Fix error checking in sdma_event_remap [5.17,018/146] dmaengine: mediatek:Fix PM usage reference leak of mtk_uart_apdma_alloc_chan_resou... [5.17,019/146] dmaengine: dw-edma: Fix unaligned 64bit access [5.17,020/146] spi: spi-mtk-nor: initialize spi controller after resume [5.17,021/146] firmware: cs_dsp: Fix overrun of unterminated control name string [5.17,022/146] esp: limit skb_page_frag_refill use to a single page [5.17,023/146] spi: cadence-quadspi: fix incorrect supports_op() return value [5.17,024/146] igc: Fix infinite loop in release_swfw_sync [5.17,025/146] igc: Fix BUG: scheduling while atomic [5.17,026/146] igc: Fix suspending when PTM is active [5.17,027/146] ice: allow creating VFs for !CONFIG_NET_SWITCHDEV [5.17,028/146] ice: fix crash in switchdev mode [5.17,029/146] ice: Fix memory leak in ice_get_orom_civd_data() [5.17,030/146] ALSA: hda/hdmi: fix warning about PCM count when used with SOF [5.17,031/146] rxrpc: Restore removed timer deletion [5.17,032/146] net/smc: Fix sock leak when release after smc_shutdown() [5.17,033/146] net/packet: fix packet_sock xmit return value checking [5.17,034/146] ip6_gre: Avoid updating tunnel->tun_hlen in __gre6_xmit() [5.17,035/146] ip6_gre: Fix skb_under_panic in __gre6_xmit() [5.17,036/146] net: restore alpha order to Ethernet devices in config [5.17,037/146] net/sched: cls_u32: fix possible leak in u32_init_knode() [5.17,038/146] l3mdev: l3mdev_master_upper_ifindex_by_index_rcu should be using netdev_master_upp... [5.17,039/146] ipv6: make ip6_rt_gc_expire an atomic_t [5.17,040/146] can: isotp: stop timeout monitoring when no first frame was sent [5.17,041/146] net: dsa: hellcreek: Calculate checksums in tagger [5.17,042/146] net: mscc: ocelot: fix broken IP multicast flooding [5.17,043/146] netlink: reset network and mac headers in netlink_dump() [5.17,044/146] drm/i915/display/psr: Unset enable_psr2_sel_fetch if other checks in intel_psr2_co... [5.17,045/146] RISC-V: KVM: Remove s & u as valid ISA extension [5.17,046/146] RISC-V: KVM: Restrict the extensions that can be disabled [5.17,047/146] net: stmmac: Use readl_poll_timeout_atomic() in atomic state [5.17,048/146] dmaengine: idxd: match type for retries var in idxd_enqcmds() [5.17,049/146] dmaengine: idxd: fix retry value to be constant for duration of function call [5.17,050/146] dmaengine: idxd: add RO check for wq max_batch_size write [5.17,051/146] dmaengine: idxd: add RO check for wq max_transfer_size write [5.17,052/146] dmaengine: idxd: skip clearing device context when device is read-only [5.17,053/146] selftests: mlxsw: vxlan_flooding: Prevent flooding of unwanted packets [5.17,054/146] selftests: mlxsw: vxlan_flooding_ipv6: Prevent flooding of unwanted packets [5.17,055/146] userfaultfd: mark uffd_wp regardless of VM_WRITE flag [5.17,056/146] arm64: mm: fix p?d_leaf() [5.17,057/146] XArray: Disallow sibling entries of nodes [5.17,058/146] drm/msm/gpu: Rename runtime suspend/resume functions [5.17,059/146] drm/msm/gpu: Remove mutex from wait_event condition [5.17,060/146] ARM: vexpress/spc: Avoid negative array index when !SMP [5.17,061/146] reset: renesas: Check return value of reset_control_deassert() [5.17,062/146] reset: tegra-bpmp: Restore Handle errors in BPMP response [5.17,063/146] platform/x86: samsung-laptop: Fix an unsigned comparison which can never be negative [5.17,064/146] ALSA: usb-audio: Fix undefined behavior due to shift overflowing the constant [5.17,065/146] drm/msm/disp: check the return value of kzalloc() [5.17,066/146] selftests: KVM: Free the GIC FD when cleaning up in arch_timer [5.17,067/146] ALSA: hda: intel-dsp-config: update AlderLake PCI IDs [5.17,068/146] arm64: dts: imx: Fix imx8*-var-som touchscreen property sizes [5.17,069/146] vxlan: fix error return code in vxlan_fdb_append [5.17,070/146] cifs: Check the IOCB_DIRECT flag, not O_DIRECT [5.17,071/146] net: atlantic: Avoid out-of-bounds indexing [5.17,072/146] mt76: Fix undefined behavior due to shift overflowing the constant [5.17,073/146] brcmfmac: sdio: Fix undefined behavior due to shift overflowing the constant [5.17,074/146] dpaa_eth: Fix missing of_node_put in dpaa_get_ts_info() [5.17,075/146] drm/msm/mdp5: check the return of kzalloc() [5.17,076/146] KVM: x86: hyper-v: Avoid writing to TSC page without an active vCPU [5.17,077/146] net: macb: Restart tx only if queue pointer is lagging [5.17,078/146] scsi: iscsi: Release endpoint ID when its freed [5.17,079/146] scsi: iscsi: Merge suspend fields [5.17,080/146] scsi: iscsi: Fix NOP handling during conn recovery [5.17,081/146] scsi: qedi: Fix failed disconnect handling [5.17,082/146] stat: fix inconsistency between struct stat and struct compat_stat [5.17,083/146] VFS: filename_create(): fix incorrect intent. [5.17,084/146] nvme: add a quirk to disable namespace identifiers [5.17,085/146] nvme-pci: disable namespace identifiers for the MAXIO MAP1002/1202 [5.17,086/146] nvme-pci: disable namespace identifiers for Qemu controllers [5.17,087/146] irq_work: use kasan_record_aux_stack_noalloc() record callstack [5.17,088/146] EDAC/synopsys: Read the error count from the correct register [5.17,089/146] mm/memory-failure.c: skip huge_zero_page in memory_failure() [5.17,090/146] memcg: sync flush only if periodic flush is delayed [5.17,091/146] mm, hugetlb: allow for "high" userspace addresses [5.17,092/146] oom_kill.c: futex: delay the OOM reaper to allow time for proper futex cleanup [5.17,093/146] mm/mmu_notifier.c: fix race in mmu_interval_notifier_remove() [5.17,094/146] ata: pata_marvell: Check the bmdma_addr beforing reading [5.17,095/146] dma: at_xdmac: fix a missing check on list iterator [5.17,096/146] dmaengine: imx-sdma: fix init of uart scripts [5.17,097/146] net: atlantic: invert deep par in pm functions, preventing null derefs [5.17,098/146] drm/radeon: fix logic inversion in radeon_sync_resv [5.17,099/146] io_uring: free iovec if file assignment fails [5.17,100/146] Input: omap4-keypad - fix pm_runtime_get_sync() error checking [5.17,101/146] scsi: sr: Do not leak information in ioctl [5.17,102/146] sched/pelt: Fix attach_entity_load_avg() corner case [5.17,103/146] perf/core: Fix perf_mmap fail when CONFIG_PERF_USE_VMALLOC enabled [5.17,104/146] drm/panel/raspberrypi-touchscreen: Avoid NULL deref if not initialised [5.17,105/146] drm/panel/raspberrypi-touchscreen: Initialise the bridge in prepare [5.17,106/146] powerpc/time: Always set decrementer in timer_interrupt() [5.17,107/146] KVM: PPC: Fix TCE handling for VFIO [5.17,108/146] drm/vc4: Use pm_runtime_resume_and_get to fix pm_runtime_get_sync() usage [5.17,109/146] powerpc/perf: Fix power9 event alternatives [5.17,110/146] powerpc/perf: Fix power10 event alternatives [5.17,111/146] arm/xen: Fix some refcount leaks [5.17,112/146] perf script: Always allow field data_src for auxtrace [5.17,113/146] perf report: Set PERF_SAMPLE_DATA_SRC bit for Arm SPE event [5.17,114/146] fs: fix acl translation [5.17,115/146] cifs: fix NULL ptr dereference in refresh_mounts() [5.17,116/146] cifs: use correct lock type in cifs_reconnect() [5.17,117/146] xtensa: patch_text: Fixup last cpu should be master [5.17,118/146] xtensa: fix a7 clobbering in coprocessor context load/store [5.17,119/146] openvswitch: fix OOB access in reserve_sfa_size() [5.17,120/146] gpio: Request interrupts after IRQ is initialized [5.17,121/146] ASoC: rt5682: fix an incorrect NULL check on list iterator [5.17,122/146] ASoC: soc-dapm: fix two incorrect uses of list iterator [5.17,123/146] e1000e: Fix possible overflow in LTR decoding [5.17,124/146] codecs: rt5682s: fix an incorrect NULL check on list iterator [5.17,125/146] ARC: entry: fix syscall_trace_exit argument [5.17,126/146] drm/vmwgfx: Fix gem refcounting and memory evictions [5.17,127/146] arm_pmu: Validate single/group leader events [5.17,128/146] KVM: x86/pmu: Update AMD PMC sample period to fix guest NMI-watchdog [5.17,129/146] KVM: x86: Dont re-acquire SRCU lock in complete_emulated_io() [5.17,130/146] KVM: x86: Pend KVM_REQ_APICV_UPDATE during vCPU creation to fix a race [5.17,131/146] KVM: nVMX: Defer APICv updates while L2 is active until L1 is active [5.17,132/146] KVM: SVM: Simplify and harden helper to flush SEV guest page(s) [5.17,133/146] KVM: SVM: Flush when freeing encrypted pages even on SME_COHERENT CPUs [5.17,134/146] ext4: fix fallocate to use file_modified to update permissions consistently [5.17,135/146] ext4: fix symlink file size not match to file content [5.17,136/146] ext4: fix use-after-free in ext4_search_dir [5.17,137/146] ext4: limit length to bitmap_maxbytes - blocksize in punch_hole [5.17,138/146] ext4, doc: fix incorrect h_reserved size [5.17,139/146] ext4: fix overhead calculation to account for the reserved gdt blocks [5.17,140/146] ext4: force overhead calculation if the s_overhead_cluster makes no sense [5.17,141/146] ext4: update the cached overhead value in the superblock [5.17,142/146] jbd2: fix a potential race while discarding reserved buffers after an abort [5.17,143/146] spi: atmel-quadspi: Fix the buswidth adjustment between spi-mem and controller [5.17,144/146] ASoC: SOF: topology: cleanup dailinks on widget unload [5.17,145/146] io_uring: fix leaks on IOPOLL and CQE_SKIP [5.17,146/146] arm64: dts: qcom: add IPA qcom,qmp property

[5.17,106/146] powerpc/time: Always set decrementer in timer_interrupt()

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