[PATCH 06/11] pci: introduce pci_assign_unassigned_bridge_resources

Yinghai Lu
2010-01-16T02:46:07Z

for pciehp to use it later

pci_setup_bridge() will not check enabled for the slot bridge, otherwise
update res is not updated to bridge BAR. that is bridge is enabled already for
port service.

-v2: update it with resource_list_x
-v3: remove the clear busmaster. according to Kenji

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/setup-bus.c | 92 ++++++++++++++++++++++++++++++++++++++++++++--
include/linux/pci.h | 1 +
2 files changed, 89 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 8ad515e..c348882 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -71,6 +71,50 @@ static void free_failed_list(struct resource_list_x *head)
head->next = NULL;
}

+static void pdev_assign_resources_sorted(struct pci_dev *dev,
+ struct resource_list_x *fail_head)
+{
+ struct resource *res;
+ struct resource_list head, *list, *tmp;
+ int idx;
+ u16 class = dev->class >> 8;
+
+ head.next = NULL;
+
+ /* Don't touch classless devices or host bridges or ioapics. */
+ if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
+ return;
+
+ /* Don't touch ioapic devices already enabled by firmware */
+ if (class == PCI_CLASS_SYSTEM_PIC) {
+ u16 command;
+ pci_read_config_word(dev, PCI_COMMAND, &command);
+ if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
+ return;
+ }
+
+ pdev_sort_resources(dev, &head);
+
+ for (list = head.next; list;) {
+ res = list->res;
+ idx = res - &list->dev->resource[0];
+ if (pci_assign_resource(list->dev, idx)) {
+ if (fail_head && !pci_is_root_bus(list->dev->bus)) {
+ /*
+ * device need to keep flags and size
+ * for second try
+ */
+ add_to_failed_list(fail_head, list->dev, res);
+ }
+ res->start = 0;
+ res->end = 0;
+ res->flags = 0;
+ }
+ tmp = list;
+ list = list->next;
+ kfree(tmp);
+ }
+}
static void pbus_assign_resources_sorted(const struct pci_bus *bus,
struct resource_list_x *fail_head)
{
@@ -278,9 +322,6 @@ static void __pci_setup_bridge(struct pci_bus *bus, unsigned long type)
{
struct pci_dev *bridge = bus->self;

- if (pci_is_enabled(bridge))
- return;
-
dev_info(&bridge->dev, "PCI bridge to [bus %02x-%02x]\n",
bus->secondary, bus->subordinate);

@@ -651,7 +692,8 @@ static void __ref __pci_bus_assign_resources(const struct pci_bus *bus,

switch (dev->class >> 8) {
case PCI_CLASS_BRIDGE_PCI:
- pci_setup_bridge(b);
+ if (!pci_is_enabled(dev))
+ pci_setup_bridge(b);
break;

case PCI_CLASS_BRIDGE_CARDBUS:
@@ -672,6 +714,34 @@ void __ref pci_bus_assign_resources(const struct pci_bus *bus)
}
EXPORT_SYMBOL(pci_bus_assign_resources);

+static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
+ struct resource_list_x *fail_head)
+{
+ struct pci_bus *b;
+
+ pdev_assign_resources_sorted((struct pci_dev *)bridge, fail_head);
+
+ b = bridge->subordinate;
+ if (!b)
+ return;
+
+ __pci_bus_assign_resources(b, fail_head);
+
+ switch (bridge->class >> 8) {
+ case PCI_CLASS_BRIDGE_PCI:
+ pci_setup_bridge(b);
+ break;
+
+ case PCI_CLASS_BRIDGE_CARDBUS:
+ pci_setup_cardbus(b);
+ break;
+
+ default:
+ dev_info(&bridge->dev, "not setting up bridge for bus "
+ "%04x:%02x\n", pci_domain_nr(b), b->number);
+ break;
+ }
+}
static void pci_bridge_release_resources(struct pci_bus *bus,
unsigned long type)
{
@@ -934,3 +1004,17 @@ enable_and_dump:
pci_bus_dump_resources(bus);
}
}
+
+void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
+{
+ struct pci_bus *bus;
+ struct pci_bus *parent = bridge->subordinate;
+ int retval;
+
+ pci_bus_size_bridges(parent);
+ __pci_bridge_assign_resources(bridge, NULL);
+ retval = pci_reenable_device(bridge);
+ pci_set_master(bridge);
+ pci_enable_bridges(parent);
+}
+EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 6b2949c..0e240ed 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -806,6 +806,7 @@ void pci_bus_assign_resources(const struct pci_bus *bus);
void pci_bus_size_bridges(struct pci_bus *bus);
int pci_claim_resource(struct pci_dev *, int);
void pci_assign_unassigned_resources(void);
+void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
void pdev_enable_device(struct pci_dev *);
void pdev_sort_resources(struct pci_dev *, struct resource_list *);
int pci_enable_resources(struct pci_dev *, int mask);
--
1.6.4.2