Message-ID: <20210104132250.GE32151@zn.tnic>
Date:   Mon, 4 Jan 2021 14:22:50 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     iommu@...ts.linux-foundation.org
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Interrupts enabled after amd_iommu_resume+0x0/0x40

Hi folks,

syscore_resume() doesn't like when the AMD iommu driver enables
interrupts in its ->resume hook when I resume the box from suspend to
RAM.

All kinds of warnings get triggered too:

[   17.386830] WARNING: CPU: 0 PID: 2 at kernel/time/timekeeping.c:824 ktime_get+0x8d/0xa0
[   17.386830] WARNING: CPU: 0 PID: 2 at kernel/time/timekeeping.c:867 ktime_get_with_offset+0xda/0xf0
[   17.386830] WARNING: CPU: 0 PID: 2 at kernel/time/timekeeping.c:824 ktime_get+0x8d/0xa0
[   17.386830] WARNING: CPU: 0 PID: 2 at kernel/time/timekeeping.c:867 ktime_get_with_offset+0xda/0xf0
[   17.386830] WARNING: CPU: 0 PID: 1576 at drivers/base/syscore.c:103 syscore_resume+0x12d/0x160

but when I comment out the

	amd_iommu_enable_interrupts()

call in the resume hook, all is fine and quiet and box resumes.

I'll try to bisect later to try to pinpoint it better because I don't
see what recent change would've caused this. But someone might have a
better idea so CC the usual suspects.

Thx.

[   17.386830] ------------[ cut here ]------------
[   17.386830] Interrupts enabled after amd_iommu_resume+0x0/0x40
[   17.386830] WARNING: CPU: 0 PID: 1576 at drivers/base/syscore.c:103 syscore_resume+0x12d/0x160
[   17.386830] Modules linked in: nls_ascii nls_cp437 vfat fat joydev iwlmvm edac_mce_amd mac80211 edac_core kvm_amd libarc4 kvm irqbypass
 crct10dif_pclmul crc32_pclmul snd_hda_codec_realtek crc32c_intel iwlwifi ghash_clmulni_intel amdgpu snd_hda_codec_generic snd_hda_codec_h
dmi snd_hda_intel snd_intel_dspcfg snd_hda_codec rtsx_pci_sdmmc aesni_intel snd_hwdep mmc_core glue_helper wmi_bmof snd_hda_core libaes cr
ypto_simd snd_pcm sp5100_tco cryptd nvram watchdog cfg80211 efi_pstore k10temp ledtrig_audio snd_timer ucsi_acpi rapl pcspkr rtsx_pci i2c_
piix4 ccp r8169 gpu_sched mfd_core typec_ucsi snd typec wmi soundcore battery ac video i2c_multi_instantiate acpi_cpufreq i2c_scmi button 
psmouse serio_raw nvme nvme_core
[   17.386830] CPU: 0 PID: 1576 Comm: hib.sh Tainted: G        W         5.11.0-rc2+ #2
[   17.386830] Hardware name: LENOVO 20Y2MMMMCC/20Y2MMMMCC, BIOS R1BET58W(1.27 ) 10/20/2020
[   17.386830] RIP: 0010:syscore_resume+0x12d/0x160
[   17.386830] Code: ff ff ff 80 3d f7 73 fb 00 00 0f 1f 00 0f 85 3b ff ff ff 48 8b 73 18 48 c7 c7 05 4f 15 82 c6 05 dc 73 fb 00 01 e8 41 
2c 2e 00 <0f> 0b e9 1d ff ff ff 80 3d ca 73 fb 00 00 0f 85 d5 fe ff ff 48 c7
[   17.386830] RSP: 0018:ffffc9000171bdd0 EFLAGS: 00010286
[   17.386830] RAX: 0000000000000000 RBX: ffffffff82539960 RCX: 0000000000000000
[   17.386830] RDX: 0000000000000001 RSI: 00000000fff7ffff RDI: 00000000ffffffff
[   17.386830] RBP: 0000000000000003 R08: 0000000000000000 R09: ffffc9000171bc08
[   17.386830] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
[   17.386830] R13: 0000000000000000 R14: ffffc9000171bde8 R15: 0000000000000000
[   17.386830] FS:  00007fc7e51da740(0000) GS:ffff8883fae00000(0000) knlGS:0000000000000000
[   17.386830] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.386830] CR2: 000055bbb352a798 CR3: 0000000172639000 CR4: 0000000000350ef0
[   17.386830] Call Trace:
[   17.386830]  suspend_devices_and_enter+0x6d4/0x810
[   17.386830]  pm_suspend.cold+0x322/0x37b
[   17.386830]  state_store+0x8b/0x100
[   17.386830]  kernfs_fop_write+0xe5/0x1d0
[   17.386830]  vfs_write+0xf0/0x2c0
[   17.386830]  ksys_write+0x70/0x100
[   17.386830]  ? fpregs_assert_state_consistent+0x1e/0x50
[   17.386830]  do_syscall_64+0x33/0x80
[   17.386830]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   17.386830] RIP: 0033:0x7fc7e52cbed3
[   17.386830] Code: 8b 15 c1 ef 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18
[   17.386830] RSP: 002b:00007fffa7f50878 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   17.386830] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fc7e52cbed3
[   17.386830] RDX: 0000000000000004 RSI: 0000563349f39a40 RDI: 0000000000000001
[   17.386830] RBP: 0000563349f39a40 R08: 000000000000000a R09: 0000000000000003
[   17.386830] R10: 0000563349f4f7f0 R11: 0000000000000246 R12: 0000000000000004
[   17.386830] R13: 00007fc7e539c6a0 R14: 0000000000000004 R15: 00007fc7e539c8a0
[   17.386830] ---[ end trace b6887b5ff5d2a76e ]---

-- 
Regards/Gruss,
    Boris.

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