From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 54149C433EF for ; Mon, 18 Oct 2021 06:22:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E67460F9D for ; Mon, 18 Oct 2021 06:22:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230242AbhJRGYw (ORCPT ); Mon, 18 Oct 2021 02:24:52 -0400 Received: from office.oderland.com ([91.201.60.5]:51576 "EHLO office.oderland.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230246AbhJRGYv (ORCPT ); Mon, 18 Oct 2021 02:24:51 -0400 Received: from [193.180.18.161] (port=36186 helo=[10.137.0.14]) by office.oderland.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.94.2) (envelope-from ) id 1mcM2f-00258i-1m; Mon, 18 Oct 2021 08:22:38 +0200 Message-ID: <859dbb71-098f-07f2-f063-4874ccc8523b@oderland.se> Date: Mon, 18 Oct 2021 08:22:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:93.0) Gecko/20100101 Thunderbird/93.0 Content-Language: en-US To: Bjorn Helgaas , linux-pci@vger.kernel.org, xen-devel Cc: Jason Andryuk , Thomas Gleixner From: Josef Johansson Subject: [PATCH] PCI/MSI: Re-add checks for skip masking MSI-X on Xen PV Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - office.oderland.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - oderland.se X-Get-Message-Sender-Via: office.oderland.com: authenticated_id: josjoh@oderland.se X-Authenticated-Sender: office.oderland.com: josjoh@oderland.se Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Josef Johansson PCI/MSI: Re-add checks for skip masking MSI-X on Xen PV 'commit fcacdfbef5a1 ("PCI/MSI: Provide a new set of mask and unmask functions")' introduced functions pci_msi_update_mask() and pci_msix_write_vector_ctrl() that were missing checks for pci_msi_ignore_mask that existed in 'commit 446a98b19fd6 ("PCI/MSI: Use new mask/unmask functions")'. This patch adds them back since it was causing softlocks in amdgpu drivers under Xen. As explained in 'commit 1a519dc7a73c ("PCI/MSI: Skip masking MSI-X on Xen PV")', when running as Xen PV guest, masking MSI-X is a responsibility of the hypervisor. Fixes: fcacdfbef5a1 ("PCI/MSI: Provide a new set of mask and unmask functions") Suggested-by: Jason Andryuk Signed-off-by: Josef Johansson --- This patch solves a major issue with booting 5.15-rc1 under Xen with amdgpu drivers. Specifically Lenovo P14s Gen 1, AMD 4750U. The softlock below takes about ~2-3 minutes to release, and will lock again if I switch between X and console, when staying in X I can do things without it softlock. I have to note that this is my first commit and PCI/MSI area is not my area of expertise. I tried to mimic what was obviously missing between the aforementioned commits. There may be better ways to solve this problem, or other places to put the checks. Should desc->msi_attrib.is_virtual be checked? It is not checked in 'commit 1a519dc7a73c ("PCI/MSI: Skip masking MSI-X on Xen PV")' I should also note that my original problem with *flip done timeout* inside drm during suspend/resume is not solved, but with this patch at least the kernel boots properly. The kernel is much more stable not running inside Xen, and much more stable running pci=nomsi (under Xen). Are we missing something more regarding masking? The error that occurs is: kernel: ------------[ cut here ]------------ kernel: WARNING: CPU: 6 PID: 3754 at drivers/gpu/drm/amd/amdgpu/../display/amdgp u_dm/amdgpu_dm.c:8630 amdgpu_dm_commit_planes+0x9b4/0x9c0 [amdgpu] kernel: Modules linked in: nf_tables nfnetlink vfat fat intel_rapl_msr wmi_bmof intel_rapl_common pcspkr joydev uvcvideo k10temp sp5100_tco videobuf2_vmalloc vi deobuf2_memops i2c_piix4 videobuf2_v4l2 videobuf2_common videodev mc iwlwifi thi nkpad_acpi platform_profile ipmi_devintf ledtrig_audio ucsi_acpi cfg80211 ipmi_m sghandler r8169 snd typec_ucsi soundcore typec rfkill wmi video amd_pmc i2c_scmi fuse xenfs ip_tables dm_thin_pool dm_persistent_data dm_bio_prison dm_crypt tru sted asn1_encoder hid_multitouch amdgpu crct10dif_pclmul iommu_v2 crc32_pclmul c rc32c_intel gpu_sched i2c_algo_bit drm_ttm_helper ttm drm_kms_helper ccp cec gha sh_clmulni_intel sdhci_pci xhci_pci xhci_pci_renesas serio_raw cqhci drm sdhci x hci_hcd mmc_core nvme ehci_pci ehci_hcd nvme_core xen_acpi_processor xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput kernel: CPU: 6 PID: 3754 Comm: Xorg Tainted: G W 5.15.0-1.fc32.qubes.x86_64 #1 kernel: Hardware name: LENOVO 20Y1S02400/20Y1S02400, BIOS R1BET61W(1.30) 12/21/ 2020 kernel: RIP: e030:amdgpu_dm_commit_planes+0x9b4/0x9c0 [amdgpu] kernel: Code: 8b 45 b0 48 c7 c7 4b fc 90 c0 4c 89 55 88 8b b0 f0 03 00 00 e8 6d cb ca ff 4c 8b 55 88 0f b6 55 ab 49 8b 72 08 e9 2b fa ff ff <0f> 0b e9 fa fe ff ff e8 40 2f 6e c1 0f 1f 44 00 00 55 b9 27 00 00 kernel: RSP: e02b:ffffc90042d93638 EFLAGS: 00010002 kernel: RAX: ffff888110840210 RBX: 00000000000083c1 RCX: 0000000000000466 kernel: RDX: 0000000000000001 RSI: 0000000000000204 RDI: ffff888110840170 kernel: RBP: ffffc90042d936f8 R08: 0000000000000002 R09: 0000000000000001 kernel: R10: 0000000000000000 R11: ffff88810cb2e118 R12: ffff888110840210 kernel: R13: ffff88810cb2e000 R14: ffff888103d50400 R15: ffff888103bb2c00 kernel: FS: 0000718c6de4da40(0000) GS:ffff888140780000(0000) knlGS:000000000000 0000 kernel: CS: 10000e030 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 0000726ada294000 CR3: 0000000103f0e000 CR4: 0000000000050660 kernel: Call Trace: kernel: amdgpu_dm_atomic_commit_tail+0xc3e/0x1360 [amdgpu] kernel: commit_tail+0x94/0x130 [drm_kms_helper] kernel: drm_atomic_helper_commit+0x113/0x140 [drm_kms_helper] kernel: drm_client_modeset_commit_atomic+0x1fc/0x240 [drm] kernel: drm_client_modeset_commit_locked+0x53/0x80 [drm] kernel: drm_fb_helper_pan_display+0xdc/0x210 [drm_kms_helper] kernel: fb_pan_display+0x83/0x100 kernel: fb_set_var+0x200/0x3b0 kernel: fbcon_blank+0x186/0x280 kernel: do_unblank_screen+0xaa/0x150 kernel: complete_change_console+0x54/0x120 kernel: vt_ioctl+0x31d/0x5f0 kernel: tty_ioctl+0x312/0x780 kernel: __x64_sys_ioctl+0x83/0xb0 kernel: do_syscall_64+0x3b/0x90 kernel: entry_SYSCALL_64_after_hwframe+0x44/0xae kernel: RIP: 0033:0x718c6e33217b kernel: Code: 0f 1e fa 48 8b 05 1d ad 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ed ac 0c 00 f7 d8 64 89 01 48 kernel: RSP: 002b:00007ffd5c6157c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 kernel: RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000718c6e33217b kernel: RDX: 0000000000000001 RSI: 0000000000005605 RDI: 0000000000000014 kernel: RBP: 000057b9b2aa93f4 R08: 0000000000000000 R09: 0000000000000001 kernel: R10: fffffffffffff9ce R11: 0000000000000246 R12: 000057b9b2aa94b0 kernel: R13: 000057b9b2aa94a0 R14: 000057b9b2aa93f0 R15: 00007ffd5c615844 kernel: ---[ end trace 2c3e3998803422cb ]--- kernel: ------------[ cut here ]------------ kernel: WARNING: CPU: 6 PID: 3754 at drivers/gpu/drm/amd/amdgpu/../display/amdgp u_dm/amdgpu_dm.c:8217 prepare_flip_isr+0x64/0x70 [amdgpu] kernel: Modules linked in: nf_tables nfnetlink vfat fat intel_rapl_msr wmi_bmof intel_rapl_common pcspkr joydev uvcvideo k10temp sp5100_tco videobuf2_vmalloc vi deobuf2_memops i2c_piix4 videobuf2_v4l2 videobuf2_common videodev mc iwlwifi thi nkpad_acpi platform_profile ipmi_devintf ledtrig_audio ucsi_acpi cfg80211 ipmi_m sghandler r8169 snd typec_ucsi soundcore typec rfkill wmi video amd_pmc i2c_scmi fuse xenfs ip_tables dm_thin_pool dm_persistent_data dm_bio_prison dm_crypt tru sted asn1_encoder hid_multitouch amdgpu crct10dif_pclmul iommu_v2 crc32_pclmul c rc32c_intel gpu_sched i2c_algo_bit drm_ttm_helper ttm drm_kms_helper ccp cec gha sh_clmulni_intel sdhci_pci xhci_pci xhci_pci_renesas serio_raw cqhci drm sdhci x hci_hcd mmc_core nvme ehci_pci ehci_hcd nvme_core xen_acpi_processor xen_privcmd xen_pciback xen_blkback xen_gntalloc xen_gntdev xen_evtchn uinput kernel: CPU: 6 PID: 3754 Comm: Xorg Tainted: G W 5.15.0-1.fc32.qubes.x86_64 #1 kernel: Hardware name: LENOVO 20Y1S02400/20Y1S02400, BIOS R1BET61W(1.30) 12/21/ 2020 kernel: RIP: e030:prepare_flip_isr+0x64/0x70 [amdgpu] kernel: Code: 00 48 c7 80 38 01 00 00 00 00 00 00 66 90 c3 8b 97 f0 03 00 00 48 c7 c6 18 72 8d c0 48 c7 c7 90 5b a7 c0 e9 7e 6e 13 c1 0f 0b <0f> 0b eb b4 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 kernel: RSP: e02b:ffffc90042d93630 EFLAGS: 00010086 kernel: RAX: 0000000000000001 RBX: 00000000000083c1 RCX: 0000000000000466 kernel: RDX: 0000000000000001 RSI: 0000000000000204 RDI: ffff88810cb2e000 kernel: RBP: ffffc90042d936f8 R08: 0000000000000002 R09: 0000000000000001 kernel: R10: 0000000000000000 R11: ffff88810cb2e118 R12: ffff888110840210 kernel: R13: ffff88810cb2e000 R14: ffff888103d50400 R15: ffff888103bb2c00 kernel: FS: 0000718c6de4da40(0000) GS:ffff888140780000(0000) knlGS:000000000000 0000 kernel: CS: 10000e030 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 0000726ada294000 CR3: 0000000103f0e000 CR4: 0000000000050660 kernel: Call Trace: kernel: amdgpu_dm_commit_planes+0x8bd/0x9c0 [amdgpu] kernel: amdgpu_dm_atomic_commit_tail+0xc3e/0x1360 [amdgpu] kernel: commit_tail+0x94/0x130 [drm_kms_helper] kernel: drm_atomic_helper_commit+0x113/0x140 [drm_kms_helper] kernel: drm_client_modeset_commit_atomic+0x1fc/0x240 [drm] kernel: drm_client_modeset_commit_locked+0x53/0x80 [drm] kernel: drm_fb_helper_pan_display+0xdc/0x210 [drm_kms_helper] kernel: fb_pan_display+0x83/0x100 kernel: fb_set_var+0x200/0x3b0 kernel: fbcon_blank+0x186/0x280 kernel: do_unblank_screen+0xaa/0x150 kernel: complete_change_console+0x54/0x120 kernel: vt_ioctl+0x31d/0x5f0 kernel: tty_ioctl+0x312/0x780 kernel: __x64_sys_ioctl+0x83/0xb0 kernel: do_syscall_64+0x3b/0x90 kernel: entry_SYSCALL_64_after_hwframe+0x44/0xae kernel: RIP: 0033:0x718c6e33217b kernel: Code: 0f 1e fa 48 8b 05 1d ad 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ed ac 0c 00 f7 d8 64 89 01 48 kernel: RSP: 002b:00007ffd5c6157c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 kernel: RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000718c6e33217b kernel: RDX: 0000000000000001 RSI: 0000000000005605 RDI: 0000000000000014 kernel: RBP: 000057b9b2aa93f4 R08: 0000000000000000 R09: 0000000000000001 kernel: R10: fffffffffffff9ce R11: 0000000000000246 R12: 000057b9b2aa94b0 kernel: R13: 000057b9b2aa94a0 R14: 000057b9b2aa93f0 R15: 00007ffd5c615844 kernel: ---[ end trace 2c3e3998803422cc ]--- It is discussed briefly at: https://lore.kernel.org/linux-pci/CAKf6xpvGyCKVHsvauP54=0j10fxis4XiiqBNWH+1cpkbtt_QJw@mail.gmail.com/ diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 0099a00af361..355b791e382f 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -148,6 +148,9 @@ static noinline void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 s raw_spinlock_t *lock = &desc->dev->msi_lock; unsigned long flags; + if (pci_msi_ignore_mask || desc->msi_attrib.is_virtual) + return; + raw_spin_lock_irqsave(lock, flags); desc->msi_mask &= ~clear; desc->msi_mask |= set; @@ -181,6 +184,9 @@ static void pci_msix_write_vector_ctrl(struct msi_desc *desc, u32 ctrl) { void __iomem *desc_addr = pci_msix_desc_addr(desc); + if (pci_msi_ignore_mask || desc->msi_attrib.is_virtual) + return; + writel(ctrl, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL); } -- 2.31.1