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PCI: Allow root and child buses to have different pci_ops 

PCI host bridges often have different ways to access the root and child
bus config spaces. The host bridge drivers have invented their own
abstractions to handle this. Let's support having different root and
child bus pci_ops so these per driver abstractions can be removed.

Link: https://lore.kernel.org/r/20200821035420.380495-2-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Rob Herring 2020-08-20 21:53:41 -06:00 committed by Lorenzo Pieralisi
parent 16270a9235
commit 07e292950b
2 changed files with 8 additions and 1 deletions
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8
drivers/pci/probe.c
View File

@ -1036,6 +1036,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
struct pci_dev *bridge, int busnr)
{
struct pci_bus *child;
struct pci_host_bridge *host;
int i;
int ret;
@ -1045,11 +1046,16 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
return NULL;
child->parent = parent;
child->ops = parent->ops;
child->msi = parent->msi;
child->sysdata = parent->sysdata;
child->bus_flags = parent->bus_flags;
host = pci_find_host_bridge(parent);
if (host->child_ops)
child->ops = host->child_ops;
else
child->ops = parent->ops;
/*
* Initialize some portions of the bus device, but don't register
* it now as the parent is not properly set up yet.

1
include/linux/pci.h
View File

@ -523,6 +523,7 @@ struct pci_host_bridge {
struct device dev;
struct pci_bus *bus; /* Root bus */
struct pci_ops *ops;
struct pci_ops *child_ops;
void *sysdata;
int busnr;
struct list_head windows; /* resource_entry */