linux-kernel - [RFC 2/5] PCI/ACPI: Store ACPI device information in the host bridge structure

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Date:   Wed, 11 Aug 2021 23:36:16 +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 2/5] PCI/ACPI: Store ACPI device information in the host bridge structure

In order to decouple the ACPI device information of a PCI host bridge
from the sysdata, ->private of pci_host_bridge is used to store the ACPI
device, and it's done by the new pci_create_root_bus_priv().

A reader function is also added, to retrieve the ACPI device information
in pci_host_bridge.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 drivers/acpi/pci_root.c  | 5 +++--
 include/linux/pci-acpi.h | 5 +++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index d7deedf3548e..82824841cbda 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -894,8 +894,9 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 
 	pci_acpi_root_add_resources(info);
 	pci_add_resource(&info->resources, &root->secondary);
-	bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
-				  sysdata, &info->resources);
+	bus = pci_create_root_bus_priv(NULL, busnum, ops->pci_ops, sysdata,
+				       &info->resources, &root->device,
+				       sizeof(struct acpi_device *));
 	if (!bus)
 		goto out_release_info;
 
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index 5ba475ca9078..21d4cc80aa55 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -80,6 +80,11 @@ extern struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 					    struct acpi_pci_root_ops *ops,
 					    struct acpi_pci_root_info *info,
 					    void *sd);
+static inline struct acpi_device *
+acpi_pci_root_device(struct pci_host_bridge *bridge)
+{
+	return *((struct acpi_device **)bridge->private);
+}
 
 void acpi_pci_add_bus(struct pci_bus *bus);
 void acpi_pci_remove_bus(struct pci_bus *bus);
-- 
2.32.0