linux-kernel - [RFC v2 6/7] PCI: arm64: Allow pci_config

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Message-Id: <20210503144635.2297386-7-boqun.feng@gmail.com>
Date:   Mon,  3 May 2021 22:46:34 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>, Arnd Bergmann <arnd@...db.de>,
        Marc Zyngier <maz@...nel.org>
Cc:     Russell King <linux@...linux.org.uk>, Andrew Lunn <andrew@...n.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Mike Rapoport <rppt@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-hyperv@...r.kernel.org
Subject: [RFC v2 6/7] PCI: arm64: Allow pci_config_window::parent to be NULL

This is purely a hack, for ARM64 Hyper-V guest, there is no
corresponding ACPI device for the root bridge, so the best we can
provide is an all-zeroed pci_config_window, and in this case make
pcibios_root_bridge_prepare() act as the ACPI device is NULL.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 arch/arm64/kernel/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index e9a6eeb6a694..f159df903ccb 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -83,7 +83,7 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 {
 	if (!acpi_disabled) {
 		struct pci_config_window *cfg = bridge->bus->sysdata;
-		struct acpi_device *adev = to_acpi_device(cfg->parent);
+		struct acpi_device *adev = cfg->parent ? to_acpi_device(cfg->parent) : NULL;
 		struct device *bus_dev = &bridge->bus->dev;
 
 		ACPI_COMPANION_SET(&bridge->dev, adev);
-- 
2.30.2