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-rw-r--r--drivers/pci/setup-bus.c162
1 files changed, 72 insertions, 90 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 720159bca54d..3bc329b1b923 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -2059,15 +2059,16 @@ static void remove_dev_resource(struct resource *avail, struct pci_dev *dev,
avail->start = min(avail->start + tmp, avail->end + 1);
}
-static void remove_dev_resources(struct pci_dev *dev, struct resource *io,
- struct resource *mmio,
- struct resource *mmio_pref)
+static void remove_dev_resources(struct pci_dev *dev,
+ struct resource available[PCI_P2P_BRIDGE_RESOURCE_NUM])
{
+ struct resource *mmio_pref = &available[PCI_BUS_BRIDGE_PREF_MEM_WINDOW];
struct resource *res;
pci_dev_for_each_resource(dev, res) {
if (resource_type(res) == IORESOURCE_IO) {
- remove_dev_resource(io, dev, res);
+ remove_dev_resource(&available[PCI_BUS_BRIDGE_IO_WINDOW],
+ dev, res);
} else if (resource_type(res) == IORESOURCE_MEM) {
/*
@@ -2081,10 +2082,13 @@ static void remove_dev_resources(struct pci_dev *dev, struct resource *io,
*/
if ((res->flags & IORESOURCE_PREFETCH) &&
((res->flags & IORESOURCE_MEM_64) ==
- (mmio_pref->flags & IORESOURCE_MEM_64)))
- remove_dev_resource(mmio_pref, dev, res);
- else
- remove_dev_resource(mmio, dev, res);
+ (mmio_pref->flags & IORESOURCE_MEM_64))) {
+ remove_dev_resource(&available[PCI_BUS_BRIDGE_PREF_MEM_WINDOW],
+ dev, res);
+ } else {
+ remove_dev_resource(&available[PCI_BUS_BRIDGE_MEM_WINDOW],
+ dev, res);
+ }
}
}
}
@@ -2099,45 +2103,39 @@ static void remove_dev_resources(struct pci_dev *dev, struct resource *io,
* shared with the bridges.
*/
static void pci_bus_distribute_available_resources(struct pci_bus *bus,
- struct list_head *add_list,
- struct resource io,
- struct resource mmio,
- struct resource mmio_pref)
+ struct list_head *add_list,
+ struct resource available_in[PCI_P2P_BRIDGE_RESOURCE_NUM])
{
+ struct resource available[PCI_P2P_BRIDGE_RESOURCE_NUM];
unsigned int normal_bridges = 0, hotplug_bridges = 0;
- struct resource *io_res, *mmio_res, *mmio_pref_res;
struct pci_dev *dev, *bridge = bus->self;
- resource_size_t io_per_b, mmio_per_b, mmio_pref_per_b, align;
+ resource_size_t per_bridge[PCI_P2P_BRIDGE_RESOURCE_NUM];
+ resource_size_t align;
+ int i;
- io_res = &bridge->resource[PCI_BRIDGE_IO_WINDOW];
- mmio_res = &bridge->resource[PCI_BRIDGE_MEM_WINDOW];
- mmio_pref_res = &bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
+ for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++) {
+ struct resource *res = pci_bus_resource_n(bus, i);
- /*
- * The alignment of this bridge is yet to be considered, hence it must
- * be done now before extending its bridge window.
- */
- align = pci_resource_alignment(bridge, io_res);
- if (!io_res->parent && align)
- io.start = min(ALIGN(io.start, align), io.end + 1);
-
- align = pci_resource_alignment(bridge, mmio_res);
- if (!mmio_res->parent && align)
- mmio.start = min(ALIGN(mmio.start, align), mmio.end + 1);
+ available[i] = available_in[i];
- align = pci_resource_alignment(bridge, mmio_pref_res);
- if (!mmio_pref_res->parent && align)
- mmio_pref.start = min(ALIGN(mmio_pref.start, align),
- mmio_pref.end + 1);
+ /*
+ * The alignment of this bridge is yet to be considered,
+ * hence it must be done now before extending its bridge
+ * window.
+ */
+ align = pci_resource_alignment(bridge, res);
+ if (!res->parent && align)
+ available[i].start = min(ALIGN(available[i].start, align),
+ available[i].end + 1);
- /*
- * Now that we have adjusted for alignment, update the bridge window
- * resources to fill as much remaining resource space as possible.
- */
- adjust_bridge_window(bridge, io_res, add_list, resource_size(&io));
- adjust_bridge_window(bridge, mmio_res, add_list, resource_size(&mmio));
- adjust_bridge_window(bridge, mmio_pref_res, add_list,
- resource_size(&mmio_pref));
+ /*
+ * Now that we have adjusted for alignment, update the
+ * bridge window resources to fill as much remaining
+ * resource space as possible.
+ */
+ adjust_bridge_window(bridge, res, add_list,
+ resource_size(&available[i]));
+ }
/*
* Calculate how many hotplug bridges and normal bridges there
@@ -2161,7 +2159,7 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
*/
list_for_each_entry(dev, &bus->devices, bus_list) {
if (!dev->is_virtfn)
- remove_dev_resources(dev, &io, &mmio, &mmio_pref);
+ remove_dev_resources(dev, available);
}
/*
@@ -2173,16 +2171,9 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
* split between non-hotplug bridges. This is to allow possible
* hotplug bridges below them to get the extra space as well.
*/
- if (hotplug_bridges) {
- io_per_b = div64_ul(resource_size(&io), hotplug_bridges);
- mmio_per_b = div64_ul(resource_size(&mmio), hotplug_bridges);
- mmio_pref_per_b = div64_ul(resource_size(&mmio_pref),
- hotplug_bridges);
- } else {
- io_per_b = div64_ul(resource_size(&io), normal_bridges);
- mmio_per_b = div64_ul(resource_size(&mmio), normal_bridges);
- mmio_pref_per_b = div64_ul(resource_size(&mmio_pref),
- normal_bridges);
+ for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++) {
+ per_bridge[i] = div64_ul(resource_size(&available[i]),
+ hotplug_bridges ?: normal_bridges);
}
for_each_pci_bridge(dev, bus) {
@@ -2195,49 +2186,41 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
if (hotplug_bridges && !dev->is_hotplug_bridge)
continue;
- res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
+ for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++) {
+ res = pci_bus_resource_n(bus, i);
- /*
- * Make sure the split resource space is properly aligned
- * for bridge windows (align it down to avoid going above
- * what is available).
- */
- align = pci_resource_alignment(dev, res);
- resource_set_size(&io, ALIGN_DOWN_IF_NONZERO(io_per_b, align));
-
- /*
- * The x_per_b holds the extra resource space that can be
- * added for each bridge but there is the minimal already
- * reserved as well so adjust x.start down accordingly to
- * cover the whole space.
- */
- io.start -= resource_size(res);
-
- res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
- align = pci_resource_alignment(dev, res);
- resource_set_size(&mmio,
- ALIGN_DOWN_IF_NONZERO(mmio_per_b,align));
- mmio.start -= resource_size(res);
+ /*
+ * Make sure the split resource space is properly
+ * aligned for bridge windows (align it down to
+ * avoid going above what is available).
+ */
+ align = pci_resource_alignment(dev, res);
+ resource_set_size(&available[i],
+ ALIGN_DOWN_IF_NONZERO(per_bridge[i],
+ align));
- res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
- align = pci_resource_alignment(dev, res);
- resource_set_size(&mmio_pref,
- ALIGN_DOWN_IF_NONZERO(mmio_pref_per_b, align));
- mmio_pref.start -= resource_size(res);
+ /*
+ * The per_bridge holds the extra resource space
+ * that can be added for each bridge but there is
+ * the minimal already reserved as well so adjust
+ * x.start down accordingly to cover the whole
+ * space.
+ */
+ available[i].start -= resource_size(res);
+ }
- pci_bus_distribute_available_resources(b, add_list, io, mmio,
- mmio_pref);
+ pci_bus_distribute_available_resources(b, add_list, available);
- io.start += io.end + 1;
- mmio.start += mmio.end + 1;
- mmio_pref.start += mmio_pref.end + 1;
+ for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++)
+ available[i].start += available[i].end + 1;
}
}
static void pci_bridge_distribute_available_resources(struct pci_dev *bridge,
struct list_head *add_list)
{
- struct resource available_io, available_mmio, available_mmio_pref;
+ struct resource *res, available[PCI_P2P_BRIDGE_RESOURCE_NUM];
+ unsigned int i;
if (!bridge->is_hotplug_bridge)
return;
@@ -2245,14 +2228,13 @@ static void pci_bridge_distribute_available_resources(struct pci_dev *bridge,
pci_dbg(bridge, "distributing available resources\n");
/* Take the initial extra resources from the hotplug port */
- available_io = bridge->resource[PCI_BRIDGE_IO_WINDOW];
- available_mmio = bridge->resource[PCI_BRIDGE_MEM_WINDOW];
- available_mmio_pref = bridge->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
+ for (i = 0; i < PCI_P2P_BRIDGE_RESOURCE_NUM; i++) {
+ res = pci_resource_n(bridge, PCI_BRIDGE_RESOURCES + i);
+ available[i] = *res;
+ }
pci_bus_distribute_available_resources(bridge->subordinate,
- add_list, available_io,
- available_mmio,
- available_mmio_pref);
+ add_list, available);
}
static bool pci_bridge_resources_not_assigned(struct pci_dev *dev)
generated by cgit (git 2.34.1) at 2025-12-26 23:25:49 +0000