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Merge branch 'pci/resource' 

- Coalesce host bridge contiguous apertures to allow P2P bridge windows
  that span several contiguous host bridge apertures (Kai-Heng Feng)

* pci/resource:
  PCI: Coalesce host bridge contiguous apertures
This commit is contained in:
Bjorn Helgaas 2021-11-05 11:28:45 -05:00
parent 357cf0cddd 7c3855c423
commit 1ebec13fc9
1 changed files with 28 additions and 5 deletions
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33
drivers/pci/probe.c
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@ -883,11 +883,11 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus)
static int pci_register_host_bridge(struct pci_host_bridge *bridge)
{
struct device *parent = bridge->dev.parent;
struct resource_entry *window, *n;
struct resource_entry *window, *next, *n;
struct pci_bus *bus, *b;
resource_size_t offset;
resource_size_t offset, next_offset;
LIST_HEAD(resources);
struct resource *res;
struct resource *res, *next_res;
char addr[64], *fmt;
const char *name;
int err;
@ -970,11 +970,34 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
if (nr_node_ids > 1 && pcibus_to_node(bus) == NUMA_NO_NODE)
dev_warn(&bus->dev, "Unknown NUMA node; performance will be reduced\n");
/* Add initial resources to the bus */
/* Coalesce contiguous windows */
resource_list_for_each_entry_safe(window, n, &resources) {
list_move_tail(&window->node, &bridge->windows);
if (list_is_last(&window->node, &resources))
break;
next = list_next_entry(window, node);
offset = window->offset;
res = window->res;
next_offset = next->offset;
next_res = next->res;
if (res->flags != next_res->flags || offset != next_offset)
continue;
if (res->end + 1 == next_res->start) {
next_res->start = res->start;
res->flags = res->start = res->end = 0;
}
}
/* Add initial resources to the bus */
resource_list_for_each_entry_safe(window, n, &resources) {
offset = window->offset;
res = window->res;
if (!res->end)
continue;
list_move_tail(&window->node, &bridge->windows);
if (res->flags & IORESOURCE_BUS)
pci_bus_insert_busn_res(bus, bus->number, res->end);