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From: Boqun Feng <boqun.feng@gmail.com>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: "Catalin Marinas" <catalin.marinas@arm.com>,
	"Will Deacon" <will@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	"Len Brown" <lenb@kernel.org>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	"Haiyang Zhang" <haiyangz@microsoft.com>,
	"Stephen Hemminger" <sthemmin@microsoft.com>,
	"Wei Liu" <wei.liu@kernel.org>,
	"Dexuan Cui" <decui@microsoft.com>,
	"Rob Herring" <robh@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Boqun Feng" <boqun.feng@gmail.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-acpi@vger.kernel.org, linux-hyperv@vger.kernel.org,
	"Sunil Muthuswamy" <sunilmut@microsoft.com>,
	"Marc Zyngier" <maz@kernel.org>, "Arnd Bergmann" <arnd@arndb.de>
Subject: [RFC 2/5] PCI/ACPI: Store ACPI device information in the host bridge structure
Date: Wed, 11 Aug 2021 23:36:16 +0800	[thread overview]
Message-ID: <20210811153619.88922-3-boqun.feng@gmail.com> (raw)
In-Reply-To: <20210811153619.88922-1-boqun.feng@gmail.com>

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@gmail.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


  parent reply	other threads:[~2021-08-11 15:36 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 15:36 [RFC 0/5] PCI: Use the private field of pci_host_bridge for ACPI device Boqun Feng
2021-08-11 15:36 ` [RFC 1/5] PCI: Introduce pci_create_root_bus_priv() Boqun Feng
2021-08-11 15:36 ` Boqun Feng [this message]
2021-08-11 15:36 ` [RFC 3/5] PCI: hv: Set NULL as the ACPI device for the PCI host bridge Boqun Feng
2021-08-11 15:36 ` [RFC 4/5] arm64: PCI: Retrieve ACPI device information directly from host bridges Boqun Feng
2021-08-11 15:36 ` [RFC 5/5] PCI: hv: Remove the dependency of pci_config_window Boqun Feng

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