From: Arnd Bergmann <arnd@arndb.de>
To: linux-pci@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-kernel@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
linuxppc-dev@lists.ozlabs.org, linux-acpi@vger.kernel.org,
Arnd Bergmann <arnd@arndb.de>
Subject: [RFC 08/15] x86: PCI: clean up pcibios_scan_root()
Date: Fri, 17 Aug 2018 12:26:38 +0200 [thread overview]
Message-ID: <20180817102645.3839621-9-arnd@arndb.de> (raw)
In-Reply-To: <20180817102645.3839621-1-arnd@arndb.de>
pcibios_scan_root() is now just a wrapper around pci_scan_root_bus(),
and merging the two into one makes it shorter and more readable.
We can also take advantage of pci_alloc_host_bridge() doing the
allocation of the sysdata for us, which helps if we ever want to
allow hot-unplugging the host bridge itself.
We might be able to simplify it further using pci_host_probe(),
but I wasn't sure about the resource registration there.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/x86/pci/common.c | 53 ++++++++++++++-----------------------------
1 file changed, 17 insertions(+), 36 deletions(-)
diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
index e740d9aa4024..920d0885434c 100644
--- a/arch/x86/pci/common.c
+++ b/arch/x86/pci/common.c
@@ -453,54 +453,35 @@ void __init dmi_check_pciprobe(void)
dmi_check_system(pciprobe_dmi_table);
}
-static struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
- struct pci_ops *ops, void *sysdata, struct list_head *resources)
+void pcibios_scan_root(int busnum)
{
+ struct pci_sysdata *sd;
struct pci_host_bridge *bridge;
int error;
- bridge = pci_alloc_host_bridge(0);
- if (!bridge)
- return NULL;
+ bridge = pci_alloc_host_bridge(sizeof(sd));
+ if (!bridge) {
+ printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busnum);
+ return;
+ }
+ sd = pci_host_bridge_priv(bridge);
- list_splice_init(resources, &bridge->windows);
- bridge->dev.parent = parent;
- bridge->sysdata = sysdata;
- bridge->busnr = bus;
- bridge->ops = ops;
+ sd->node = x86_pci_root_bus_node(busnum);
+ x86_pci_root_bus_resources(busnum, &bridge->windows);
+ bridge->sysdata = sd;
+ bridge->busnr = busnum;
+ bridge->ops = &pci_root_ops;
+ printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
error = pci_scan_root_bus_bridge(bridge);
if (error < 0)
goto err_out;
- return bridge->bus;
+ pci_bus_add_devices(bridge->bus);
+ return;
err_out:
- kfree(bridge);
- return NULL;
-}
-
-void pcibios_scan_root(int busnum)
-{
- struct pci_bus *bus;
- struct pci_sysdata *sd;
- LIST_HEAD(resources);
-
- sd = kzalloc(sizeof(*sd), GFP_KERNEL);
- if (!sd) {
- printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busnum);
- return;
- }
- sd->node = x86_pci_root_bus_node(busnum);
- x86_pci_root_bus_resources(busnum, &resources);
- printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
- bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources);
- if (!bus) {
- pci_free_resource_list(&resources);
- kfree(sd);
- return;
- }
- pci_bus_add_devices(bus);
+ pci_free_host_bridge(bridge);
}
void __init pcibios_set_cache_line_size(void)
--
2.18.0
next prev parent reply other threads:[~2018-08-17 10:33 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-17 10:26 [RFC 00/15] PCI: turn some __weak functions into callbacks Arnd Bergmann
2018-08-17 10:26 ` [RFC 01/15] PCI: clean up legacy host bridge scan functions Arnd Bergmann
2018-08-17 10:26 ` [RFC 02/15] PCI: move pci_scan_bus into callers Arnd Bergmann
2018-08-17 10:26 ` [RFC 03/15] PCI: move pci_scan_root_bus " Arnd Bergmann
2018-08-17 10:26 ` [RFC 04/15] PCI: export pci_register_host_bridge Arnd Bergmann
2018-08-17 10:26 ` [RFC 05/15] PCI: move pci_create_root_bus into callers Arnd Bergmann
2018-08-17 10:26 ` [RFC 06/15] powerpc/pci: fold pci_create_root_bus into pcibios_scan_phb Arnd Bergmann
2018-08-17 10:26 ` [RFC 07/15] PCI/ACPI: clean up acpi_pci_root_create() Arnd Bergmann
2018-08-20 8:23 ` Rafael J. Wysocki
2018-08-20 11:19 ` Arnd Bergmann
2018-08-20 11:24 ` Rafael J. Wysocki
2018-08-20 11:36 ` Arnd Bergmann
2018-08-17 10:26 ` Arnd Bergmann [this message]
2018-08-20 8:31 ` [RFC 08/15] x86: PCI: clean up pcibios_scan_root() Rafael J. Wysocki
2018-08-20 11:16 ` Arnd Bergmann
2018-08-20 11:26 ` Rafael J. Wysocki
2018-08-17 10:26 ` [RFC 09/15] PCI: xenfront: clean up pcifront_scan_root() Arnd Bergmann
2018-08-17 10:26 ` [RFC 10/15] sparc/PCI: simplify pci_scan_one_pbm Arnd Bergmann
2018-08-17 10:26 ` [RFC 11/15] PCI: hyperv: convert to pci_scan_root_bus_bridge Arnd Bergmann
2018-08-17 10:26 ` [RFC 12/15] PCI: make pcibios_bus_add_device() a callback function Arnd Bergmann
2018-08-17 10:26 ` [RFC 13/15] PCI: turn pcibios_alloc_irq into a callback Arnd Bergmann
2018-08-17 10:26 ` [RFC 14/15] PCI: make pcibios_root_bridge_prepare " Arnd Bergmann
2018-08-17 10:26 ` [RFC 15/15] PCI: make pcibios_add_bus/remove_bus callbacks Arnd Bergmann
2018-08-21 6:14 ` [RFC 00/15] PCI: turn some __weak functions into callbacks Christoph Hellwig
2018-08-21 10:07 ` Arnd Bergmann
2018-08-21 11:30 ` David Woodhouse
2018-08-21 13:14 ` Christoph Hellwig
2018-10-02 20:59 ` Bjorn Helgaas
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