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From: Boqun Feng <boqun.feng@gmail.com>
To: Bjorn Helgaas <bhelgaas@google.com>,
	Arnd Bergmann <arnd@arndb.de>, Marc Zyngier <maz@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>,
	Andrew Lunn <andrew@lunn.ch>,
	Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
	Gregory Clement <gregory.clement@bootlin.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Rob Herring <robh@kernel.org>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	Wei Liu <wei.liu@kernel.org>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	Mike Rapoport <rppt@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jon Derrick <jonathan.derrick@intel.com>,
	Sunil Muthuswamy <sunilmut@microsoft.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org,
	linux-pci@vger.kernel.org, linux-hyperv@vger.kernel.org
Subject: [RFC v2 6/7] PCI: arm64: Allow pci_config_window::parent to be NULL
Date: Mon,  3 May 2021 22:46:34 +0800	[thread overview]
Message-ID: <20210503144635.2297386-7-boqun.feng@gmail.com> (raw)
In-Reply-To: <20210503144635.2297386-1-boqun.feng@gmail.com>

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@gmail.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


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  parent reply	other threads:[~2021-05-03 14:50 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-03 14:46 [RFC v2 0/7] PCI: hv: Support host bridge probing on ARM64 Boqun Feng
2021-05-03 14:46 ` [RFC v2 1/7] PCI: Introduce pci_host_bridge::domain_nr Boqun Feng
2021-05-04  5:16   ` Mike Rapoport
2021-05-04 14:34     ` Rob Herring
2021-05-06 10:52     ` Lorenzo Pieralisi
2021-05-10 13:44       ` Boqun Feng
2021-05-14  9:19         ` Lorenzo Pieralisi
2021-05-03 14:46 ` [RFC v2 2/7] PCI: Allow msi domain set-up at host probing time Boqun Feng
2021-05-03 14:46 ` [RFC v2 3/7] PCI: hv: Generify PCI probing Boqun Feng
2021-05-03 14:46 ` [RFC v2 4/7] PCI: hv: Use pci_host_bridge::domain_nr for PCI domain Boqun Feng
2021-05-03 14:46 ` [RFC v2 5/7] PCI: hv: Set up msi domain at bridge probing time Boqun Feng
2021-05-03 14:46 ` Boqun Feng [this message]
2021-05-06 22:25   ` [RFC v2 6/7] PCI: arm64: Allow pci_config_window::parent to be NULL Bjorn Helgaas
2021-05-10  7:04     ` Boqun Feng
2021-05-03 14:46 ` [RFC v2 7/7] PCI: hv: Turn on the host bridge probing on ARM64 Boqun Feng

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