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The 1st generation MediaTek PCIe host bridge cannot handle Message Signaled Interrupts (MSIs). The core PCI code is not aware that MSI is not available. This results in warnings of the form: WARNING: CPU: 2 PID: 112 at include/linux/msi.h:219 pci_msi_setup_msi_irqs.constprop.8+0x64/0x6c Modules linked in: ahci(+) libahci libata sd_mod scsi_mod gpio_button_hotplug CPU: 2 PID: 112 Comm: kmodloader Not tainted 5.10.52 #0 Hardware name: Mediatek Cortex-A7 (Device Tree) Import patches that introduce the 'no_msi' attribute to signal missing MSI support to the core PCI. Refresh patches: - 000-spi-fix-fifo.patch - 330-mtk-bmt-support.patch - 510-net-mediatek-add-flow-offload-for-mt7623.patch - 601-PCI-mediatek-Use-regmap-to-get-shared-pcie-cfg-base.patch - 610-pcie-mediatek-fix-clearing-interrupt-status.patch - 700-net-ethernet-mtk_eth_soc-add-support-for-coherent-DM.patch - 710-pci-pcie-mediatek-add-support-for-coherent-DMA.patch Signed-off-by: Nick Hainke <vincent@systemli.org>
45 lines
1.7 KiB
Diff
45 lines
1.7 KiB
Diff
From 94e89b145371b68fa0ea294855adebcd03e0522e Mon Sep 17 00:00:00 2001
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From: Marc Zyngier <maz@kernel.org>
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Date: Tue, 30 Mar 2021 16:11:41 +0100
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Subject: PCI/MSI: Let PCI host bridges declare their reliance on MSI domains
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There is a whole class of host bridges that cannot know whether
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MSIs will be provided or not, as they rely on other blocks
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to provide the MSI functionnality, using MSI domains. This is
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the case for example on systems that use the ARM GIC architecture.
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Introduce a new attribute ('msi_domain') indicating that implicit
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dependency, and use this property to set the NO_MSI flag when
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no MSI domain is found at probe time.
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Link: https://lore.kernel.org/r/20210330151145.997953-11-maz@kernel.org
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Signed-off-by: Marc Zyngier <maz@kernel.org>
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Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
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Acked-by: Bjorn Helgaas <bhelgaas@google.com>
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---
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drivers/pci/probe.c | 2 ++
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include/linux/pci.h | 1 +
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2 files changed, 3 insertions(+)
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--- a/drivers/pci/probe.c
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+++ b/drivers/pci/probe.c
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@@ -925,6 +925,8 @@ static int pci_register_host_bridge(stru
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device_enable_async_suspend(bus->bridge);
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pci_set_bus_of_node(bus);
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pci_set_bus_msi_domain(bus);
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+ if (bridge->msi_domain && !dev_get_msi_domain(&bus->dev))
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+ bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
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if (!parent)
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set_dev_node(bus->bridge, pcibus_to_node(bus));
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--- a/include/linux/pci.h
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+++ b/include/linux/pci.h
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@@ -545,6 +545,7 @@ struct pci_host_bridge {
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unsigned int native_dpc:1; /* OS may use PCIe DPC */
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unsigned int preserve_config:1; /* Preserve FW resource setup */
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unsigned int size_windows:1; /* Enable root bus sizing */
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+ unsigned int msi_domain:1; /* Bridge wants MSI domain */
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/* Resource alignment requirements */
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resource_size_t (*align_resource)(struct pci_dev *dev,
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