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Message-ID: <20210813163942.0e64dd01@coco.lan>
Date: Fri, 13 Aug 2021 16:39:53 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To: Rob Herring <robh@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>, linuxarm@...wei.com,
mauro.chehab@...wei.com, Xiaowei Song <songxiaowei@...ilicon.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: PCI: kirin: fix HiKey970 example
Em Fri, 13 Aug 2021 16:32:55 +0200
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> escreveu:
> Em Thu, 12 Aug 2021 07:56:56 -0500
> Rob Herring <robh@...nel.org> escreveu:
>
> > > + msi-parent = <&its_pcie>;
> >
> > Why do we need this change? Adding the child nodes shouldn't change
> > the behavior here. I'd expect that we'd walk the parent nodes until we
> > find a 'msi-parent' much like 'interrupt-parent'.
> >
> > It looks like we walk PCI bus parents to get the MSI domain, but we
> > don't walk the DT node parents.
> >
> > Adding Marc for his thoughts.
>
> This is actually not directly related with the pcie hierarchy needed by the
> per-slot PERST# signal, but it seems to be related to the fact that, on
> this device, we have this topology:
>
>
> +------------+
> | Kirin 970 | +------------+
> | PCIe bus 0 | ---> | PCIe bus 1 | ---> PCI bus (2 slots + Eth)
> +------------+ +------------+
>
> With this change, we have ("version 1"):
>
> soc {
> its_pcie: interrupt-controller@...00000 {
> reg = <0x0 0xf5100000 0x0 0x100000>;
> compatible = "arm,gic-v3-its";
> msi-controller;
> };
> pcie@...00000 {
> #interrupt-cells = <1>;
> interrupts = <GIC_SPI 283 IRQ_TYPE_LEVEL_HIGH>;
> interrupt-names = "msi";
> interrupt-map-mask = <0 0 0 7>;
> interrupt-map = <0x0 0 0 1 &gic GIC_SPI 282 IRQ_TYPE_LEVEL_HIGH>,
> <0x0 0 0 2 &gic GIC_SPI 283 IRQ_TYPE_LEVEL_HIGH>,
> <0x0 0 0 3 &gic GIC_SPI 284 IRQ_TYPE_LEVEL_HIGH>,
> <0x0 0 0 4 &gic GIC_SPI 285 IRQ_TYPE_LEVEL_HIGH>;
> pcie@0,0 {
> msi-parent = <&its_pcie>;
>
> };
> };
> };
>
> While the original version ("version 2") was:
>
> soc {
> its_pcie: interrupt-controller@...00000 {
> reg = <0x0 0xf5100000 0x0 0x100000>;
> compatible = "arm,gic-v3-its";
> msi-controller;
> };
> pcie@...00000 {
> #interrupt-cells = <1>;
> interrupts = <GIC_SPI 283 IRQ_TYPE_LEVEL_HIGH>;
> interrupt-names = "msi";
> interrupt-map-mask = <0 0 0 7>;
> interrupt-map = <0x0 0 0 1 &gic GIC_SPI 282 IRQ_TYPE_LEVEL_HIGH>,
> <0x0 0 0 2 &gic GIC_SPI 283 IRQ_TYPE_LEVEL_HIGH>,
> <0x0 0 0 3 &gic GIC_SPI 284 IRQ_TYPE_LEVEL_HIGH>,
> <0x0 0 0 4 &gic GIC_SPI 285 IRQ_TYPE_LEVEL_HIGH>;
> msi-parent = <&its_pcie>;
> pcie@0,0 {
> ... (no msi-parent here)
> };
> };
> };
>
> With both versions, PCI works OK.
>
> Wowever, "version 2" produce lots of crap at dmesg (see enclosed).
>
> The root cause seems to be happening on this function:
>
> static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> {
> struct irq_domain *domain;
>
> domain = dev_get_msi_domain(&dev->dev);
> if (domain && irq_domain_is_hierarchy(domain))
> return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
>
> return arch_setup_msi_irqs(dev, nvec, type);
> }
>
> It sounds that dev_get_msi_domain() fails with "version 1", probably
> because of the additional PCIe bridge, but works fine with "version 2".
Sorry, clicked <enter> too soon. I actually meant the reverse here:
It sounds that dev_get_msi_domain() fails with "version 2", probably
because of the additional PCIe bridge, but works fine with "version 1".
>
> Thanks,
> Mauro
>
> [ 5.034618] ------------[ cut here ]------------
> [ 5.039239] WARNING: CPU: 4 PID: 7 at include/linux/msi.h:256 __pci_enable_msi_range+0x398/0x59c
> [ 5.048035] Modules linked in: wl18xx(+) wlcore mac80211 libarc4 cfg80211 wlcore_sdio crct10dif_ce tcpci_rt1711h tcpci tcpm typec phy_hi3670_usb3 phy_hi3670_pcie pcie_kirin hisi_hikey_usb rfkill drm fuse ip_tables x_tables ipv6
> [ 5.068231] CPU: 4 PID: 7 Comm: kworker/u16:0 Not tainted 5.14.0-rc1+ #340
> [ 5.075103] Hardware name: HiKey970 (DT)
> [ 5.079020] Workqueue: events_unbound deferred_probe_work_func
> [ 5.084855] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
> [ 5.088800] mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
> [ 5.090856] pc : __pci_enable_msi_range+0x398/0x59c
> [ 5.090860] lr : __pci_enable_msi_range+0x2b8/0x59c
> [ 5.109813] sp : ffff80001220b670
> [ 5.113119] x29: ffff80001220b670 x28: ffff000104547000 x27: 0000000000000001
> [ 5.120252] x26: ffff0001045472f0 x25: ffff80001216626c x24: 0000000000000000
> [ 5.127383] x23: ffff0001045470c8 x22: 0000000000000001 x21: 0000000000000001
> [ 5.129006] mmc_host mmc1: Bus speed (slot 0) = 25000000Hz (slot req 25000000Hz, actual 25000000HZ div = 0)
> [ 5.134515] x20: 0000000000000001 x19: ffff0001055b7d00 x18: 00000000fffffffd
> [ 5.134519] x17: 6572702066666666 x16: 6632376678302d30 x15: 0000000000000020
> [ 5.158527] x14: 0000000000000001 x13: ffff00010e9ec803 x12: 0000000000000040
> [ 5.165663] x11: ffff000100400248 x10: ffff00010040024a x9 : 0000000000000000
> [ 5.172805] x8 : ffff0001055b7d80 x7 : ffff800013000000 x6 : ffff800008f73190
> [ 5.185571] x5 : 0000000040000000 x4 : 0000000000000000 x3 : ffff800010808ba0
> [ 5.194702] x2 : 0000000000000000 x1 : ffff0001045472f0 x0 : 0000000000000000
> [ 5.201855] Call trace:
> [ 5.201859] __pci_enable_msi_range+0x398/0x59c
> [ 5.201868] pci_alloc_irq_vectors_affinity+0xe0/0x140
> [ 5.201872] pcie_port_device_register+0x15c/0x4fc
> [ 5.201877] pcie_portdrv_probe+0x44/0xfc
> [ 5.201881] local_pci_probe+0x40/0xac
> [ 5.201886] pci_device_probe+0x114/0x1b0
> [ 5.201891] really_probe+0x1b0/0x42c
> [ 5.201895] __driver_probe_device+0x114/0x190
> [ 5.201899] driver_probe_device+0x40/0x100
> [ 5.242782] __device_attach_driver+0x98/0x130
> [ 5.242789] bus_for_each_drv+0x78/0xd0
> [ 5.242792] __device_attach+0xdc/0x1c0
> [ 5.242795] device_attach+0x14/0x20
> [ 5.242800] pci_bus_add_device+0x50/0xb4
> [ 5.242806] pci_bus_add_devices+0x3c/0x8c
> [ 5.266581] pci_host_probe+0x40/0xc4
> [ 5.266593] dw_pcie_host_init+0x198/0x470
> [ 5.266600] kirin_pcie_probe+0x5cc/0x88c [pcie_kirin]
> [ 5.266610] platform_probe+0x68/0xe0
> [ 5.266614] really_probe+0x1b0/0x42c
> [ 5.272805] mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
> [ 5.274366] __driver_probe_device+0x114/0x190
> [ 5.300468] driver_probe_device+0x40/0x100
> [ 5.300480] __device_attach_driver+0x98/0x130
> [ 5.300484] bus_for_each_drv+0x78/0xd0
> [ 5.300488] __device_attach+0xdc/0x1c0
> [ 5.313196] mmc_host mmc1: Bus speed (slot 0) = 25000000Hz (slot req 25000000Hz, actual 25000000HZ div = 0)
> [ 5.316763] device_initial_probe+0x14/0x20
> [ 5.316766] bus_probe_device+0x98/0xa0
> [ 5.316770] deferred_probe_work_func+0x9c/0xf0
> [ 5.339026] process_one_work+0x1cc/0x350
> [ 5.339035] worker_thread+0x138/0x46c
> [ 5.339040] kthread+0x150/0x160
> [ 5.350007] ret_from_fork+0x10/0x18
> [ 5.358700] ---[ end trace a4c2ccee5a840ad8 ]---
> [ 5.363529] ------------[ cut here ]------------
> [ 5.373739] WARNING: CPU: 4 PID: 7 at include/linux/msi.h:262 free_msi_irqs+0x54/0x1a0
> [ 5.373751] Modules linked in: wl18xx wlcore mac80211 libarc4 cfg80211 wlcore_sdio crct10dif_ce tcpci_rt1711h tcpci tcpm typec phy_hi3670_usb3 phy_hi3670_pcie pcie_kirin hisi_hikey_usb rfkill drm fuse ip_tables x_tables ipv6
> [ 5.402792] CPU: 4 PID: 7 Comm: kworker/u16:0 Tainted: G W 5.14.0-rc1+ #340
> [ 5.402801] Hardware name: HiKey970 (DT)
> [ 5.402804] Workqueue: events_unbound deferred_probe_work_func
> [ 5.402816] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
> [ 5.402820] pc : free_msi_irqs+0x54/0x1a0
> [ 5.402825] lr : __pci_enable_msi_range+0x3dc/0x59c
> [ 5.402829] sp : ffff80001220b620
> [ 5.402830] x29: ffff80001220b620 x28: ffff000104547000 x27: 00000000ffffffed
> [ 5.402835] x26: ffff0001045472f0 x25: ffff0001045470c8 x24: 0000000000000000
> [ 5.402840] x23: ffff0001045470c8 x22: ffff000104547000 x21: ffff0001045472f0
> [ 5.402843] x20: 0000000000000001 x19: ffff0001045472f0 x18: 00000000fffffffd
> [ 5.402847] x17: 6572702066666666 x16: 6632376678302d30 x15: 0000000000000020
> [ 5.402851] x14: 0000000000000001 x13: ffff00010e9ec803 x12: 0000000000000040
> [ 5.402855] x11: ffff000100400248 x10: ffff00010040024a
> [ 5.424804] mmc_host mmc1: Bus speed (slot 0) = 400000Hz (slot req 400000Hz, actual 400000HZ div = 0)
> [ 5.426863] x9 : 0000000000000000
> [ 5.426866] x8 : ffff0001055b7d80 x7 : ffff800013000000 x6 : ffff800008f73190
> [ 5.461001] mmc_host mmc1: Bus speed (slot 0) = 25000000Hz (slot req 25000000Hz, actual 25000000HZ div = 0)
> [ 5.467547] x5 : 0000000040000000 x4 : 0000000000000000 x3 : ffff800010808ba0
> [ 5.467552] x2 : 0000000000000000 x1 : ffff0001000cd580 x0 : 0000000000000000
> [ 5.523618] Call trace:
> [ 5.523621] free_msi_irqs+0x54/0x1a0
> [ 5.523625] __pci_enable_msi_range+0x3dc/0x59c
> [ 5.541384] pci_alloc_irq_vectors_affinity+0xe0/0x140
> [ 5.541392] pcie_port_device_register+0x15c/0x4fc
> [ 5.541396] pcie_portdrv_probe+0x44/0xfc
> [ 5.541400] local_pci_probe+0x40/0xac
> [ 5.541404] pci_device_probe+0x114/0x1b0
> [ 5.541407] really_probe+0x1b0/0x42c
> [ 5.541412] __driver_probe_device+0x114/0x190
> [ 5.571173] driver_probe_device+0x40/0x100
> [ 5.571186] __device_attach_driver+0x98/0x130
> [ 5.579813] bus_for_each_drv+0x78/0xd0
> [ 5.579819] __device_attach+0xdc/0x1c0
> [ 5.579822] device_attach+0x14/0x20
> [ 5.579826] pci_bus_add_device+0x50/0xb4
> [ 5.579830] pci_bus_add_devices+0x3c/0x8c
> [ 5.603932] pci_host_probe+0x40/0xc4
> [ 5.607754] dw_pcie_host_init+0x198/0x470
> [ 5.611850] kirin_pcie_probe+0x5cc/0x88c [pcie_kirin]
> [ 5.621932] platform_probe+0x68/0xe0
> [ 5.625594] really_probe+0x1b0/0x42c
> [ 5.629424] __driver_probe_device+0x114/0x190
> [ 5.633870] driver_probe_device+0x40/0x100
> [ 5.643685] __device_attach_driver+0x98/0x130
> [ 5.648123] bus_for_each_drv+0x78/0xd0
> [ 5.652121] __device_attach+0xdc/0x1c0
> [ 5.656118] device_initial_probe+0x14/0x20
> [ 5.660295] bus_probe_device+0x98/0xa0
> [ 5.669763] deferred_probe_work_func+0x9c/0xf0
> [ 5.674288] process_one_work+0x1cc/0x350
> [ 5.678459] worker_thread+0x138/0x46c
> [ 5.682202] kthread+0x150/0x160
> [ 5.690802] ret_from_fork+0x10/0x18
> [ 5.694375] ---[ end trace a4c2ccee5a840ad9 ]---
> [ 5.699345] pcieport 0000:00:00.0: PME: Signaling with IRQ 57
> [ 5.699721] pcieport 0000:00:00.0: AER: enabled with IRQ 57
> [ 5.716257] wlcore: wl18xx HW: 183x or 180x, PG 2.2 (ROM 0x11)
> [ 5.716612] pcieport 0000:01:00.0: enabling device (0000 -> 0002)
> [ 5.729396] wlcore: WARNING Detected unconfigured mac address in nvs, derive from fuse instead.
> [ 5.734803] pcieport 0000:02:07.0: enabling device (0000 -> 0002)
> [ 5.742879] wlcore: WARNING This default nvs file can be removed from the file system
> [ 5.755469] ------------[ cut here ]------------
> [ 5.765439] wlcore: loaded
> [ 5.766377] WARNING: CPU: 6 PID: 7 at include/linux/msi.h:256 __pci_enable_msix_range+0x5ec/0x6b0
> [ 5.777977] Modules linked in: wl18xx wlcore mac80211 libarc4 cfg80211 wlcore_sdio crct10dif_ce tcpci_rt1711h tcpci tcpm typec phy_hi3670_usb3 phy_hi3670_pcie pcie_kirin hisi_hikey_usb rfkill drm fuse ip_tables x_tables ipv6
> [ 5.797948] CPU: 6 PID: 7 Comm: kworker/u16:0 Tainted: G W 5.14.0-rc1+ #340
> [ 5.806233] Hardware name: HiKey970 (DT)
> [ 5.815789] Workqueue: events_unbound deferred_probe_work_func
> [ 5.821884] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)
> [ 5.827915] pc : __pci_enable_msix_range+0x5ec/0x6b0
> [ 5.827937] lr : __pci_enable_msix_range+0x37c/0x6b0
> [ 5.827942] sp : ffff80001220b620
> [ 5.827944] x29: ffff80001220b620 x28: 0000000000000000 x27: ffff000108fce000
> [ 5.827954] x26: ffff000108fce0c8 x25: 0000000000000001 x24: 0000000000000000
> [ 5.827958] x23: 000000000000000c x22: 0000000000000001 x21: ffff000108fce2f0
> [ 5.827962] x20: 0000000000000001 x19: 0000000000000000 x18: 0000000000000002
> [ 5.827966] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
> [ 5.827970] x14: 0000000000000000 x13: 000000000000027e x12: ffff80001286b000
> [ 5.876878] x11: ffff800012869000 x10: 00000000f7200000 x9 : 0000000000000000
> [ 5.876886] x8 : 0000000000000039 x7 : 0000000000000000 x6 : 000000000000003f
> [ 5.876891] x5 : ffff000108fce2f0 x4 : ffff80001220b5e0 x3 : 0000000000000000
> [ 5.876896] x2 : ffff800012869000 x1 : 0000000000000004 x0 : 0000000000000000
> [ 5.876901] Call trace:
> [ 5.876904] __pci_enable_msix_range+0x5ec/0x6b0
> [ 5.919629] pci_alloc_irq_vectors_affinity+0xc0/0x140
> [ 5.919645] rtl_init_one+0x55c/0xf90
> [ 5.919653] local_pci_probe+0x40/0xac
> [ 5.932195] pci_device_probe+0x114/0x1b0
> [ 5.932200] really_probe+0x1b0/0x42c
> [ 5.932205] __driver_probe_device+0x114/0x190
> [ 5.932209] driver_probe_device+0x40/0x100
> [ 5.932212] __device_attach_driver+0x98/0x130
> [ 5.932217] bus_for_each_drv+0x78/0xd0
> [ 5.932220] __device_attach+0xdc/0x1c0
> [ 5.932223] device_attach+0x14/0x20
> [ 5.932227] pci_bus_add_device+0x50/0xb4
> [ 5.932231] pci_bus_add_devices+0x3c/0x8c
> [ 5.932234] pci_bus_add_devices+0x68/0x8c
> [ 5.932236] pci_bus_add_devices+0x68/0x8c
> [ 5.932239] pci_bus_add_devices+0x68/0x8c
> [ 5.932241] pci_host_probe+0x40/0xc4
> [ 5.932244] dw_pcie_host_init+0x198/0x470
> [ 5.932250] kirin_pcie_probe+0x5cc/0x88c [pcie_kirin]
> [ 5.932259] platform_probe+0x68/0xe0
> [ 5.932262] really_probe+0x1b0/0x42c
> [ 5.932265] __driver_probe_device+0x114/0x190
> [ 5.932268] driver_probe_device+0x40/0x100
> [ 5.932271] __device_attach_driver+0x98/0x130
> [ 5.932274] bus_for_each_drv+0x78/0xd0
> [ 5.932277] __device_attach+0xdc/0x1c0
> [ 5.932280] device_initial_probe+0x14/0x20
> [ 5.932283] bus_probe_device+0x98/0xa0
> [ 5.932286] deferred_probe_work_func+0x9c/0xf0
> [ 5.932289] process_one_work+0x1cc/0x350
> [ 5.932295] worker_thread+0x138/0x46c
> [ 5.932298] kthread+0x150/0x160
> [ 5.932302] ret_from_fork+0x10/0x18
> [ 5.932307] ---[ end trace a4c2ccee5a840ada ]---
>
>
Thanks,
Mauro
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