[PATCH v3 0/3] Small INTx fixes for Rockchip's dwc based PCIe controller driver
Diederik de Haas
diederik at cknow-tech.com
Wed Sep 23 02:13:13 PDT 2026
Hi,
On Tue Sep 22, 2026 at 4:36 AM CEST, Shawn Lin wrote:
>
> This short series fixes the INTx handling around the newly introduced
> .reset_root_port() (b376b3ff9cb0), and is split in three patches per
> Niklas' suggestion:
>
> Patch 1 stops .reset_root_port() from recreating the INTx irq domain
> on every root port reset, which leaked the old domain and silently
> broke INTx delivery afterwards, the downstream devices' virqs were
> allocated in the previous domain and were never re-mapped. By moving
> the of_irq_get_byname() lookup, the INTx irq domain creation and the
> chained handler installation into rockchip_pcie_configure_rc(), right
> after dw_pcie_host_init(). This leaves .init() with nothing but
> idempotent register programming, so it can safely be re-run by
> .reset_root_port() and dw_pcie_resume_noirq().
>
> Patch 2 makes the irq domain and the chained handler devm-managed, so
> that they are released with the device instead of leaking, which also
> addresses the probe failure leak/use-after-free flagged by the Sashiko
> review.
>
> Patch 3 keeps the INTx IRQ masked while .reset_root_port() gates the
> controller clocks, so the chained handler cannot read the unclocked
> APB bus and raise a synchronous external abort.
I build a kernel with this patch set (7.3~rc4-2) and got several warnings
like this, shortly followed by a stack trace:
irq: no irq domain found for legacy-interrupt-controller !
Then I build another kernel (7.3~rc4-3) where I disabled this patch set
and then I did not get the warnings/stack traces.
I was able to reproduce this on the following devices:
1) NanoPC-T6 Plus (RK3588)
2) Rock 5B (RK3588)
3) NanoPi-R5S (RK3568)
ad 3) Possibly unrelated, but I sometimes get this error:
gpio-keys gpio-keys: error -ENXIO: Unable to get irq number for GPIO
But that is *not* dependent on this patch set; I'm not sure if I've
seen it with this patch set. Could be because I haven't booted enough
with the 7.3~rc4-2 kernel. Or maybe this patch set fixed it?
The (only) correlation is that it has to do with IRQs.
I don't know if this patch set caused the warning/stack traces or just
brought an underlying issue to surface, but hopefully you do.
Warnings/stack trace on NanoPC-T6 Plus (because it's the most extensive):
```
root at nanopc-t6-plus:~# dmesg --level 4
[ 2.684054] pci 0003:30:00.0: Primary bus is hard wired to 0
[ 2.691234] irq: no irq domain found for legacy-interrupt-controller !
[ 3.043257] irq: no irq domain found for legacy-interrupt-controller !
[ 3.133600] ------------[ cut here ]------------
[ 3.133619] error: hwirq 0x0 is too large for :pcie at fe150000:legacy-interrupt-controller
[ 3.133639] WARNING: kernel/irq/irqdomain.c:676 at irq_domain_associate_locked+0x118/0x1a0, CPU#7: kworker/u32:5/60
[ 3.133662] Modules linked in: nvme rk808_regulator nvme_core nvme_keyring nvme_auth fusb302 tcpm rockchipdrm fan53555 aux_hpd_bridge dw_hdmi_qp rtc_hym8563 dw_mipi_dsi dw_hdmi analogix_dp drm_dp_aux_bus drm_display_helper rockchip_saradc fixed sdhci_of_dwcmshc cec phy_rockchip_usbdp sdhci_pltfm industrialio_triggered_buffer phy_rockchip_naneng_combphy dw_mmc_rockchip sdhci rc_core typec dw_mmc_pltfm gpio_rockchip phy_rockchip_samsung_hdptx display_connector phy_rockchip_snps_pcie3 kfifo_buf nvmem_rockchip_otp drm_client_lib cqhci ohci_platform spi_rockchip_sfc dw_mmc dw_wdt spi_rockchip rockchip_dfi pl330 drm_dma_helper ehci_platform drm_kms_helper dwc3 ehci_hcd drm ohci_hcd udc_core adc_keys usbcore i2c_rk3x phy_rockchip_inno_usb2 industrialio pwm_rockchip ulpi usb_common
[ 3.133815] CPU: 7 UID: 0 PID: 60 Comm: kworker/u32:5 Not tainted 7.3-rc4+unreleased-arm64-cknow #1 PREEMPTLAZY Debian 7.3~rc4-2
[ 3.133831] Hardware name: FriendlyElec NanoPC-T6 Plus (DT)
[ 3.133838] Workqueue: async async_run_entry_fn
[ 3.133852] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 3.133862] pc : irq_domain_associate_locked+0x118/0x1a0
[ 3.133872] lr : irq_domain_associate_locked+0x118/0x1a0
[ 3.133881] sp : ffff80008043b9c0
[ 3.133887] x29: ffff80008043b9c0 x28: 0000000000000000 x27: 0000000000000000
[ 3.133900] x26: ffff000100038c00 x25: 00000000fffffef7 x24: ffff0001095393e8
[ 3.133913] x23: 0000000000000000 x22: 0000000000000073 x21: 0000000000000000
[ 3.133925] x20: ffff0001196c9e30 x19: ffff000108e8d500 x18: 000000000000000a
[ 3.133937] x17: 7075727265746e69 x16: 2d79636167656c3a x15: 0720072007200720
[ 3.133949] x14: 0720072007200720 x13: 0720072007200720 x12: 000000000006ff90
[ 3.133961] x11: ffffc87b581950d0 x10: ffffc87b5810cf08 x9 : ffffc87b55db6444
[ 3.133974] x8 : ffffc87b5817d0e8 x7 : ffffffffffffefff x6 : 0000000000000001
[ 3.133985] x5 : ffffc87b5817d078 x4 : 0000000000000000 x3 : 0000000000000000
[ 3.133997] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000100b7a580
[ 3.134010] Call trace:
[ 3.134016] irq_domain_associate_locked+0x118/0x1a0 (P)
[ 3.134028] irq_create_mapping_affinity_locked+0x98/0x1b8
[ 3.134039] irq_create_fwspec_mapping+0x320/0x3e0
[ 3.134049] irq_create_of_mapping+0x74/0xb0
[ 3.134059] of_irq_parse_and_map_pci+0xf8/0x1f8
[ 3.134072] pci_assign_irq+0x9c/0x180
[ 3.134082] pci_device_probe+0x68/0x170
[ 3.134091] really_probe+0xc8/0x3f8
[ 3.134102] __driver_probe_device+0x168/0x1c8
[ 3.134110] driver_probe_device+0x44/0x128
[ 3.134119] __driver_attach_async_helper+0x58/0xf8
[ 3.134128] async_run_entry_fn+0x40/0x1a0
[ 3.134138] process_one_work+0x1cc/0x550
[ 3.134150] worker_thread+0x18c/0x2f0
[ 3.134161] kthread+0x134/0x150
[ 3.134171] ret_from_fork+0x10/0x20
[ 3.134183] ---[ end trace 0000000000000000 ]---
[ 3.331933] pci 0004:40:00.0: Primary bus is hard wired to 0
[ 3.338953] irq: no irq domain found for legacy-interrupt-controller !
[ 3.492147] ------------[ cut here ]------------
[ 3.492161] error: hwirq 0x0 is too large for :pcie at fe190000:legacy-interrupt-controller
[ 3.492182] WARNING: kernel/irq/irqdomain.c:676 at irq_domain_associate_locked+0x118/0x1a0, CPU#6: (udev-worker)/187
[ 3.492205] Modules linked in: r8169(+) realtek phy_package mdio_devres of_mdio fixed_phy fwnode_mdio libphy mdio_bus xhci_plat_hcd xhci_hcd nvme rk808_regulator nvme_core nvme_keyring nvme_auth fusb302 tcpm rockchipdrm fan53555 aux_hpd_bridge dw_hdmi_qp rtc_hym8563 dw_mipi_dsi dw_hdmi analogix_dp drm_dp_aux_bus drm_display_helper rockchip_saradc fixed sdhci_of_dwcmshc cec phy_rockchip_usbdp sdhci_pltfm industrialio_triggered_buffer phy_rockchip_naneng_combphy dw_mmc_rockchip sdhci rc_core typec dw_mmc_pltfm gpio_rockchip phy_rockchip_samsung_hdptx display_connector phy_rockchip_snps_pcie3 kfifo_buf nvmem_rockchip_otp drm_client_lib cqhci ohci_platform spi_rockchip_sfc dw_mmc dw_wdt spi_rockchip rockchip_dfi pl330 drm_dma_helper ehci_platform drm_kms_helper dwc3 ehci_hcd drm ohci_hcd udc_core adc_keys usbcore i2c_rk3x phy_rockchip_inno_usb2 industrialio pwm_rockchip ulpi usb_common
[ 3.492388] CPU: 6 UID: 0 PID: 187 Comm: (udev-worker) Tainted: G W 7.3-rc4+unreleased-arm64-cknow #1 PREEMPTLAZY Debian 7.3~rc4-2
[ 3.492404] Tainted: [W]=WARN
[ 3.492410] Hardware name: FriendlyElec NanoPC-T6 Plus (DT)
[ 3.492417] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 3.492427] pc : irq_domain_associate_locked+0x118/0x1a0
[ 3.492437] lr : irq_domain_associate_locked+0x118/0x1a0
[ 3.492446] sp : ffff8000818335e0
[ 3.492451] x29: ffff8000818335e0 x28: ffffc87b5865ccb8 x27: ffffc87ae59d7818
[ 3.492465] x26: 000000000000000c x25: ffff000103534310 x24: ffff00010a50cde8
[ 3.492477] x23: 0000000000000000 x22: 0000000000000088 x21: 0000000000000000
[ 3.492490] x20: ffff000168464630 x19: ffff000108fb2a00 x18: 000000000000000a
[ 3.492502] x17: 7075727265746e69 x16: 2d79636167656c3a x15: 0720072007200720
[ 3.492514] x14: 0720072007200720 x13: 0720072007200720 x12: 000000000006ff90
[ 3.492526] x11: ffffc87b581950d0 x10: ffffc87b5810cf08 x9 : ffffc87b55db6444
[ 3.492538] x8 : ffffc87b5817d0e8 x7 : ffffffffffffefff x6 : 0000000000000001
[ 3.492550] x5 : ffffc87b5817d078 x4 : 0000000000000000 x3 : 0000000000000000
[ 3.492562] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0001097192c0
[ 3.492574] Call trace:
[ 3.492579] irq_domain_associate_locked+0x118/0x1a0 (P)
[ 3.492591] irq_create_mapping_affinity_locked+0x98/0x1b8
[ 3.492602] irq_create_fwspec_mapping+0x320/0x3e0
[ 3.492613] irq_create_of_mapping+0x74/0xb0
[ 3.492623] of_irq_parse_and_map_pci+0xf8/0x1f8
[ 3.492635] pci_assign_irq+0x9c/0x180
[ 3.492646] pci_device_probe+0x68/0x170
[ 3.492656] really_probe+0xc8/0x3f8
[ 3.492666] __driver_probe_device+0x168/0x1c8
[ 3.492675] driver_probe_device+0x44/0x128
[ 3.492683] __driver_attach+0xd0/0x228
[ 3.492692] bus_for_each_dev+0x84/0xf0
[ 3.492704] driver_attach+0x2c/0x40
[ 3.492712] bus_add_driver+0x124/0x280
[ 3.492720] driver_register+0x70/0x138
[ 3.492729] __pci_register_driver+0x48/0x60
[ 3.492742] rtl8169_pci_driver_init+0x30/0xfd0 [r8169]
[ 3.492768] do_one_initcall+0x5c/0x458
[ 3.492778] do_init_module+0x5c/0x280
[ 3.492788] load_module+0x1cc0/0x25b8
[ 3.492796] init_module_from_file+0xe8/0x158
[ 3.492805] __arm64_sys_finit_module+0x208/0x360
[ 3.492814] invoke_syscall.constprop.0+0xac/0x110
[ 3.492829] el0_svc_common.constprop.0+0x40/0xf0
[ 3.492842] do_el0_svc+0x24/0x40
[ 3.492854] el0_svc+0x40/0x260
[ 3.492867] el0t_64_sync_handler+0xa0/0xe8
[ 3.492879] el0t_64_sync+0x198/0x1a0
[ 3.492888] ---[ end trace 0000000000000000 ]---
[ 3.554818] pci 0002:20:00.0: Primary bus is hard wired to 0
[ 3.563276] irq: no irq domain found for legacy-interrupt-controller !
[ 3.569263] irq: no irq domain found for legacy-interrupt-controller !
[ 8.679178] panthor fb000000.gpu: [drm] Firmware protected mode entry is not supported, ignoring
[ 8.871598] rockchip-i2s-tdm fddf0000.i2s: using zero-initialized flat cache, this may cause unexpected behavior
[ 9.004753] ------------[ cut here ]------------
[ 9.004768] error: hwirq 0x0 is too large for :pcie at fe180000:legacy-interrupt-controller
[ 9.004779] WARNING: kernel/irq/irqdomain.c:676 at irq_domain_associate_locked+0x118/0x1a0, CPU#5: (udev-worker)/399
[ 9.004791] Modules linked in: mt7925e(+) aes_ce_blk mt7925_common snd_soc_audio_graph_card(+) ghash_ce gf128mul mt792x_lib pwm_fan mt76_connac_lib btusb leds_gpio snd_soc_simple_card gpio_ir_recv btrtl snd_soc_simple_card_utils mt76 btintel rk805_pwrkey btbcm snd_soc_hdmi_codec ofpart snd_soc_rockchip_i2s_tdm snd_soc_es8389 mac80211 btmtk snd_soc_core rockchip_thermal bluetooth rockchip_vdec synopsys_hdmirx spi_nor v4l2_vp9 rockchip_rga snd_compress mtd v4l2_dv_timings v4l2_h264 ecdh_generic snd_pcm_dmaengine videobuf2_dma_contig v4l2_mem2mem rockchip_rng videobuf2_dma_sg snd_pcm videobuf2_memops cfg80211 videobuf2_v4l2 videodev snd_timer panthor snd rocket drm_gpuvm videobuf2_common rfkill soundcore gpu_sched libarc4 vsi_iommu mc drm_shmem_helper drm_exec cpufreq_dt evdev pkcs8_key_parser nvme_fabrics efi_pstore configfs autofs4 ext4 crc16 mbcache jbd2 onboard_usb_dev r8169 realtek phy_package mdio_devres of_mdio fixed_phy fwnode_mdio libphy mdio_bus xhci_plat_hcd xhci_hcd nvme rk808_regulator nvme_core nvme_keyring
[ 9.004872] nvme_auth fusb302 tcpm rockchipdrm fan53555 aux_hpd_bridge dw_hdmi_qp rtc_hym8563 dw_mipi_dsi dw_hdmi analogix_dp drm_dp_aux_bus drm_display_helper rockchip_saradc fixed sdhci_of_dwcmshc cec phy_rockchip_usbdp sdhci_pltfm industrialio_triggered_buffer phy_rockchip_naneng_combphy dw_mmc_rockchip sdhci rc_core typec dw_mmc_pltfm gpio_rockchip phy_rockchip_samsung_hdptx display_connector phy_rockchip_snps_pcie3 kfifo_buf nvmem_rockchip_otp drm_client_lib cqhci ohci_platform spi_rockchip_sfc dw_mmc dw_wdt spi_rockchip rockchip_dfi pl330 drm_dma_helper ehci_platform drm_kms_helper dwc3 ehci_hcd drm ohci_hcd udc_core adc_keys usbcore i2c_rk3x phy_rockchip_inno_usb2 industrialio pwm_rockchip ulpi usb_common
[ 9.004964] CPU: 5 UID: 0 PID: 399 Comm: (udev-worker) Tainted: G W 7.3-rc4+unreleased-arm64-cknow #1 PREEMPTLAZY Debian 7.3~rc4-2
[ 9.004971] Tainted: [W]=WARN
[ 9.004974] Hardware name: FriendlyElec NanoPC-T6 Plus (DT)
[ 9.004977] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 9.004982] pc : irq_domain_associate_locked+0x118/0x1a0
[ 9.004986] lr : irq_domain_associate_locked+0x118/0x1a0
[ 9.004989] sp : ffff800083c734d0
[ 9.004992] x29: ffff800083c734d0 x28: ffffc87b5865ccb8 x27: ffffc87ae61951d8
[ 9.004998] x26: 000000000000000c x25: ffff0001035340b0 x24: ffff000107ec6ae8
[ 9.005003] x23: 0000000000000000 x22: 00000000000000a3 x21: 0000000000000000
[ 9.005008] x20: ffff0001180b0030 x19: ffff000108e26200 x18: 000000000000000a
[ 9.005013] x17: 7075727265746e69 x16: 2d79636167656c3a x15: 0720072007200720
[ 9.005018] x14: 0720072007200720 x13: 0720072007200720 x12: 000000000006ff90
[ 9.005023] x11: ffffc87b581950d0 x10: ffffc87b5810cf08 x9 : ffffc87b55db6444
[ 9.005028] x8 : ffffc87b5817d0e8 x7 : ffffffffffffefff x6 : 0000000000000001
[ 9.005033] x5 : ffff0005fdeff208 x4 : ffff378aa5f0e000 x3 : ffff000168385dc0
[ 9.005038] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000168385dc0
[ 9.005044] Call trace:
[ 9.005046] irq_domain_associate_locked+0x118/0x1a0 (P)
[ 9.005052] irq_create_mapping_affinity_locked+0x98/0x1b8
[ 9.005056] irq_create_fwspec_mapping+0x320/0x3e0
[ 9.005061] irq_create_of_mapping+0x74/0xb0
[ 9.005065] of_irq_parse_and_map_pci+0xf8/0x1f8
[ 9.005071] pci_assign_irq+0x9c/0x180
[ 9.005076] pci_device_probe+0x68/0x170
[ 9.005080] really_probe+0xc8/0x3f8
[ 9.005085] __driver_probe_device+0x168/0x1c8
[ 9.005088] driver_probe_device+0x44/0x128
[ 9.005092] __driver_attach+0xd0/0x228
[ 9.005095] bus_for_each_dev+0x84/0xf0
[ 9.005100] driver_attach+0x2c/0x40
[ 9.005103] bus_add_driver+0x124/0x280
[ 9.005106] driver_register+0x70/0x138
[ 9.005110] __pci_register_driver+0x48/0x60
[ 9.005116] mt7925_pci_driver_init+0x30/0xfd0 [mt7925e]
[ 9.005125] do_one_initcall+0x5c/0x458
[ 9.005129] do_init_module+0x5c/0x280
[ 9.005134] load_module+0x1cc0/0x25b8
[ 9.005137] init_module_from_file+0xe8/0x158
[ 9.005141] __arm64_sys_finit_module+0x208/0x360
[ 9.005144] invoke_syscall.constprop.0+0xac/0x110
[ 9.005151] el0_svc_common.constprop.0+0xc0/0xf0
[ 9.005156] do_el0_svc+0x24/0x40
[ 9.005161] el0_svc+0x40/0x260
[ 9.005167] el0t_64_sync_handler+0xa0/0xe8
[ 9.005171] el0t_64_sync+0x198/0x1a0
[ 9.005176] ---[ end trace 0000000000000000 ]---
[ 10.568235] Bluetooth: hci0: HCI Enhanced Setup Synchronous Connection command is advertised, but not supported.
```
The ``mt7925`` one is from my M.2 Wi-Fi+BT card plugged into the system.
rk3588-nanopc-t6-plus-intx-fixes-stacktraces-dmesg.txt:
https://paste.sr.ht/~diederik/85ee576b76934754139a496488d451ef89f88db0
rk3588-rock5b-intx-fixes-stacktraces-dmesg.txt:
https://paste.sr.ht/~diederik/c6d46b2e5e0de22316bd31ad63152afed1a2dc70
rk3568-nanopi-r5s-intx-fixes-stacktraces-dmesg.txt:
https://paste.sr.ht/~diederik/9b83b304646df3823687b75e5e07c683658d1024
Cheers,
Diederik
> Changes in v3:
> - split devm-managed part into a seperate patch
>
> Changes in v2:
> - Moved the of_irq_get_byname() lookup, the INTx irq domain creation
> and the chained handler installation out of the host ops .init()
> callback into rockchip_pcie_configure_rc(), right after
> dw_pcie_host_init(), as suggested by Niklas Cassel. This supersedes
> v1 patch 1/2, as .init() no longer creates the irq domain, and
> removes the rockchip_pcie_host_hw_init() helper from v1.
> - Made the INTx irq domain devm-managed with
> devm_irq_domain_instantiate() and uninstall the chained handler
> through a devres action, addressing the probe failure leak and
> use-after-free flagged by the Sashiko review.
> - keep the INTx IRQ masked while .reset_root_port()
> gates the controller clocks, responding to the Sashiko review
> finding about accessing the unclocked APB bus.
>
> Shawn Lin (3):
> PCI: dw-rockchip: Move the INTx irq setup to probe
> PCI: dw-rockchip: Make the INTx irq setup devm-managed
> PCI: dw-rockchip: Mask the INTx IRQ while the controller clocks are
> gated
>
> drivers/pci/controller/dwc/pcie-dw-rockchip.c | 77 ++++++++++++++++++++-------
> 1 file changed, 57 insertions(+), 20 deletions(-)
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