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authorBjorn Helgaas <bhelgaas@google.com>2021-07-06 10:56:25 -0500
committerBjorn Helgaas <bhelgaas@google.com>2021-07-06 10:56:25 -0500
commit131e4f76c9ae9636046bf04d19d43af0e4ae9807 (patch)
tree2a7a8843c095d2689099fb2bfa2da6b7eea5ede8 /drivers/pci
parent76d826c32f88a1c39bc51cf262db48b4babc7414 (diff)
parent65db04053efea3f3e412a7e0cc599962999c96b4 (diff)
Merge branch 'pci/resource'
- Coalesce host bridge apertures so we can allocate large BARs that cross contiguous apertures (Kai-Heng Feng) * pci/resource: PCI: Coalesce host bridge contiguous apertures
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/probe.c50
1 files changed, 46 insertions, 4 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 7d9eddc2c913..72fccb86330f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -19,6 +19,7 @@
#include <linux/hypervisor.h>
#include <linux/irqdomain.h>
#include <linux/pm_runtime.h>
+#include <linux/list_sort.h>
#include "pci.h"
#define CARDBUS_LATENCY_TIMER 176 /* secondary latency timer */
@@ -874,14 +875,31 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus)
dev_set_msi_domain(&bus->dev, d);
}
+static int res_cmp(void *priv, const struct list_head *a,
+ const struct list_head *b)
+{
+ struct resource_entry *entry1, *entry2;
+
+ entry1 = container_of(a, struct resource_entry, node);
+ entry2 = container_of(b, struct resource_entry, node);
+
+ if (entry1->res->flags != entry2->res->flags)
+ return entry1->res->flags > entry2->res->flags;
+
+ if (entry1->offset != entry2->offset)
+ return entry1->offset > entry2->offset;
+
+ return entry1->res->start > entry2->res->start;
+}
+
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;
@@ -960,11 +978,35 @@ 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");
+ /* Sort and coalesce contiguous windows */
+ list_sort(NULL, &resources, res_cmp);
+ resource_list_for_each_entry_safe(window, n, &resources) {
+ 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) {
- list_move_tail(&window->node, &bridge->windows);
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);