linux-kernel - [RFC 4/5] arm64: PCI: Retrieve ACPI device information directly from host bridges

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Date:   Wed, 11 Aug 2021 23:36:18 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Boqun Feng <boqun.feng@...il.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-hyperv@...r.kernel.org,
        Sunil Muthuswamy <sunilmut@...rosoft.com>,
        Marc Zyngier <maz@...nel.org>, Arnd Bergmann <arnd@...db.de>
Subject: [RFC 4/5] arm64: PCI: Retrieve ACPI device information directly from host bridges

Now since we store the corresponding ACPI device pointer in the
->private of pci_host_bridge, use it instead of the sysdata to retrieve
the ACPI device information. Doing this decouples the dependency on the
pci_config_window structure in Hyper-V virtual PCI, because passing a
NULL pointer as the ACPI device is the soly reason of the dependency.

The decoupling avoids adding pci_config_window in hv_pcibus_dev and also
makes the code cleaner.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 arch/arm64/kernel/pci.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 2276689b5411..783971749eb7 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -82,25 +82,13 @@ int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
 
 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
 {
-	struct pci_config_window *cfg;
 	struct acpi_device *adev;
 	struct device *bus_dev;
 
 	if (acpi_disabled)
 		return 0;
 
-	cfg = bridge->bus->sysdata;
-
-	/*
-	 * On Hyper-V there is no corresponding ACPI device for a root bridge,
-	 * therefore ->parent is set as NULL by the driver. And set 'adev' as
-	 * NULL in this case because there is no proper ACPI device.
-	 */
-	if (!cfg->parent)
-		adev = NULL;
-	else
-		adev = to_acpi_device(cfg->parent);
-
+	adev = acpi_pci_root_device(bridge);
 	bus_dev = &bridge->bus->dev;
 
 	ACPI_COMPANION_SET(&bridge->dev, adev);
-- 
2.32.0