linux-kernel - [RFC PATCH v4 03/20] PCI: Make pci_create_root_bus() declare its reliance on MSI domains

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Date: Mon, 15 Apr 2024 22:30:56 +0530
From: Sunil V L <sunilvl@...tanamicro.com>
To: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org,
	acpica-devel@...ts.linux.dev
Cc: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	"Rafael J . Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Anup Patel <anup@...infault.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Samuel Holland <samuel.holland@...ive.com>,
	Robert Moore <robert.moore@...el.com>,
	Haibo1 Xu <haibo1.xu@...el.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Atish Kumar Patra <atishp@...osinc.com>,
	Andrei Warkentin <andrei.warkentin@...el.com>,
	Marc Zyngier <maz@...nel.org>,
	Björn Töpel <bjorn@...nel.org>,
	Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH v4 03/20] PCI: Make pci_create_root_bus() declare its reliance on MSI domains

Similar to commit 9ec37efb8783 ("PCI/MSI: Make
pci_host_common_probe() declare its reliance on MSI domains"), declare
this dependency for PCI probe in ACPI based flow.

This is required especially for RISC-V platforms where MSI controller
can be absent. However, setting this for all architectures seem to cause
issues on non RISC-V architectures [1]. Hence, enabled this only for
RISC-V.

[1] - https://lore.kernel.org/oe-lkp/202403041047.791cb18e-oliver.sang@intel.com

Signed-off-by: Sunil V L <sunilvl@...tanamicro.com>
---
 drivers/pci/probe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 1325fbae2f28..e09915bee2ee 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3048,6 +3048,9 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 	bridge->sysdata = sysdata;
 	bridge->busnr = bus;
 	bridge->ops = ops;
+#ifdef CONFIG_RISCV
+	bridge->msi_domain = true;
+#endif
 
 	error = pci_register_host_bridge(bridge);
 	if (error < 0)
-- 
2.40.1