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Message-ID: <4B2BEC1B.9090104@kernel.org>
Date: Fri, 18 Dec 2009 12:54:51 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Jesse Barnes <jbarnes@...tuousgeek.org>,
Ingo Molnar <mingo@...e.hu>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
Alex Chiang <achiang@...com>,
Bjorn Helgaas <bjorn.helgaas@...com>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: [PATCH 2/12] pci: add pci_bridge_release_unused_res and pci_bus_release_unused_bridge_res
-v2
so later we could use it to release small resource before pci assign unassign res
-v2: change name to release_child_resources
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
drivers/pci/setup-bus.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 112 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/pci/setup-bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/setup-bus.c
+++ linux-2.6/drivers/pci/setup-bus.c
@@ -209,7 +209,6 @@ static void pci_setup_bridge_mmio_pref(s
l = (region.start >> 16) & 0xfff0;
l |= region.end & 0xfff00000;
if (res->flags & IORESOURCE_MEM_64) {
- pref_mem64 = 1;
bu = upper_32_bits(region.start);
lu = upper_32_bits(region.end);
}
@@ -608,6 +607,118 @@ void __ref pci_bus_assign_resources(cons
}
EXPORT_SYMBOL(pci_bus_assign_resources);
+static void release_child_resources(struct resource *r)
+{
+ struct resource *p;
+ resource_size_t size;
+
+ p = r->child;
+ while (p) {
+ release_child_resources(p);
+ release_resource(p);
+ printk(KERN_DEBUG "PCI: release child resource %pR\n", p);
+ /* need to restore size, and keep flags */
+ size = resource_size(p);
+ p->start = 0;
+ p->end = size - 1;
+ p = r->child;
+ }
+}
+
+static void pci_bridge_release_unused_res(struct pci_bus *bus,
+ unsigned long type)
+{
+ int idx;
+ bool changed = false;
+ struct pci_dev *dev;
+ struct resource *r;
+ unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
+ IORESOURCE_PREFETCH;
+
+ /* for pci bridges res only */
+ dev = bus->self;
+ for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_BRIDGE_RESOURCES + 3;
+ idx++) {
+ r = &dev->resource[idx];
+ if ((r->flags & type_mask) != type)
+ continue;
+ if (!r->parent)
+ continue;
+ /*
+ * if there are children under that, we should release them
+ * all
+ */
+ release_child_resources(r);
+ if (!release_resource(r)) {
+ dev_printk(KERN_DEBUG, &dev->dev,
+ "resource %d %pR released\n", idx, r);
+ /* keep the old size */
+ r->end = resource_size(r) - 1;
+ r->start = 0;
+ r->flags = 0;
+ changed = true;
+ }
+ }
+
+ if (changed) {
+ if (type & IORESOURCE_PREFETCH) {
+ /* avoiding touch the one without PREF */
+ type = IORESOURCE_PREFETCH;
+ }
+ __pci_setup_bridge(bus, type);
+ }
+}
+
+/*
+ * try to release pci bridge resources that is from leaf bridge,
+ * so we can allocate big new one later
+ * check:
+ * 0: only release the bridge and only the bridge is leaf
+ * 1: release all down side bridge for third shoot
+ */
+static void __ref pci_bus_release_unused_bridge_res(struct pci_bus *bus,
+ unsigned long type,
+ int check_leaf)
+{
+ struct pci_dev *dev;
+ bool is_leaf_bridge = true;
+
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ struct pci_bus *b = dev->subordinate;
+ if (!b)
+ continue;
+
+ switch (dev->class >> 8) {
+ case PCI_CLASS_BRIDGE_CARDBUS:
+ is_leaf_bridge = false;
+ break;
+
+ case PCI_CLASS_BRIDGE_PCI:
+ default:
+ is_leaf_bridge = false;
+ if (!check_leaf)
+ pci_bus_release_unused_bridge_res(b, type,
+ check_leaf);
+ break;
+ }
+ }
+
+ /* The root bus? */
+ if (!bus->self)
+ return;
+
+ switch (bus->self->class >> 8) {
+ case PCI_CLASS_BRIDGE_CARDBUS:
+ break;
+
+ case PCI_CLASS_BRIDGE_PCI:
+ default:
+ if ((check_leaf && is_leaf_bridge) || !check_leaf)
+ pci_bridge_release_unused_res(bus, type);
+ break;
+ }
+}
+
static void pci_bus_dump_res(struct pci_bus *bus)
{
int i;
--
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