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-rw-r--r--drivers/pci/probe.c238
-rw-r--r--include/linux/pci.h4
2 files changed, 145 insertions, 97 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index ab002671fa60..4853c8fbd701 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -521,7 +521,7 @@ static void pci_release_host_bridge_dev(struct device *dev)
kfree(bridge);
}
-static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
+static struct pci_host_bridge *pci_alloc_host_bridge(void)
{
struct pci_host_bridge *bridge;
@@ -530,7 +530,7 @@ static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
return NULL;
INIT_LIST_HEAD(&bridge->windows);
- bridge->bus = b;
+
return bridge;
}
@@ -717,6 +717,122 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus)
dev_set_msi_domain(&bus->dev, d);
}
+static int pci_register_host_bridge(struct pci_host_bridge *bridge)
+{
+ struct device *parent = bridge->dev.parent;
+ struct resource_entry *window, *n;
+ struct pci_bus *bus, *b;
+ resource_size_t offset;
+ LIST_HEAD(resources);
+ struct resource *res;
+ char addr[64], *fmt;
+ const char *name;
+ int err;
+
+ bus = pci_alloc_bus(NULL);
+ if (!bus)
+ return -ENOMEM;
+
+ bridge->bus = bus;
+
+ /* temporarily move resources off the list */
+ list_splice_init(&bridge->windows, &resources);
+ bus->sysdata = bridge->sysdata;
+ bus->msi = bridge->msi;
+ bus->ops = bridge->ops;
+ bus->number = bus->busn_res.start = bridge->busnr;
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+ bus->domain_nr = pci_bus_find_domain_nr(bus, parent);
+#endif
+
+ b = pci_find_bus(pci_domain_nr(bus), bridge->busnr);
+ if (b) {
+ /* If we already got to this bus through a different bridge, ignore it */
+ dev_dbg(&b->dev, "bus already known\n");
+ err = -EEXIST;
+ goto free;
+ }
+
+ dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(bus),
+ bridge->busnr);
+
+ err = pcibios_root_bridge_prepare(bridge);
+ if (err)
+ goto free;
+
+ err = device_register(&bridge->dev);
+ if (err)
+ put_device(&bridge->dev);
+
+ bus->bridge = get_device(&bridge->dev);
+ device_enable_async_suspend(bus->bridge);
+ pci_set_bus_of_node(bus);
+ pci_set_bus_msi_domain(bus);
+
+ if (!parent)
+ set_dev_node(bus->bridge, pcibus_to_node(bus));
+
+ bus->dev.class = &pcibus_class;
+ bus->dev.parent = bus->bridge;
+
+ dev_set_name(&bus->dev, "%04x:%02x", pci_domain_nr(bus), bus->number);
+ name = dev_name(&bus->dev);
+
+ err = device_register(&bus->dev);
+ if (err)
+ goto unregister;
+
+ pcibios_add_bus(bus);
+
+ /* Create legacy_io and legacy_mem files for this bus */
+ pci_create_legacy_files(bus);
+
+ if (parent)
+ dev_info(parent, "PCI host bridge to bus %s\n", name);
+ else
+ pr_info("PCI host bridge to bus %s\n", name);
+
+ /* 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->flags & IORESOURCE_BUS)
+ pci_bus_insert_busn_res(bus, bus->number, res->end);
+ else
+ pci_bus_add_resource(bus, res, 0);
+
+ if (offset) {
+ if (resource_type(res) == IORESOURCE_IO)
+ fmt = " (bus address [%#06llx-%#06llx])";
+ else
+ fmt = " (bus address [%#010llx-%#010llx])";
+
+ snprintf(addr, sizeof(addr), fmt,
+ (unsigned long long)(res->start - offset),
+ (unsigned long long)(res->end - offset));
+ } else
+ addr[0] = '\0';
+
+ dev_info(&bus->dev, "root bus resource %pR%s\n", res, addr);
+ }
+
+ down_write(&pci_bus_sem);
+ list_add_tail(&bus->node, &pci_root_buses);
+ up_write(&pci_bus_sem);
+
+ return 0;
+
+unregister:
+ put_device(&bridge->dev);
+ device_unregister(&bridge->dev);
+
+free:
+ kfree(bus);
+ return err;
+}
+
static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
struct pci_dev *bridge, int busnr)
{
@@ -2130,113 +2246,43 @@ void __weak pcibios_remove_bus(struct pci_bus *bus)
{
}
-struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
- struct pci_ops *ops, void *sysdata, struct list_head *resources)
+static struct pci_bus *pci_create_root_bus_msi(struct device *parent,
+ int bus, struct pci_ops *ops, void *sysdata,
+ struct list_head *resources, struct msi_controller *msi)
{
int error;
struct pci_host_bridge *bridge;
- struct pci_bus *b, *b2;
- struct resource_entry *window, *n;
- struct resource *res;
- resource_size_t offset;
- char bus_addr[64];
- char *fmt;
-
- b = pci_alloc_bus(NULL);
- if (!b)
- return NULL;
- b->sysdata = sysdata;
- b->ops = ops;
- b->number = b->busn_res.start = bus;
-#ifdef CONFIG_PCI_DOMAINS_GENERIC
- b->domain_nr = pci_bus_find_domain_nr(b, parent);
-#endif
- b2 = pci_find_bus(pci_domain_nr(b), bus);
- if (b2) {
- /* If we already got to this bus through a different bridge, ignore it */
- dev_dbg(&b2->dev, "bus already known\n");
- goto err_out;
- }
-
- bridge = pci_alloc_host_bridge(b);
+ bridge = pci_alloc_host_bridge();
if (!bridge)
- goto err_out;
+ return NULL;
bridge->dev.parent = parent;
bridge->dev.release = pci_release_host_bridge_dev;
- dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
- error = pcibios_root_bridge_prepare(bridge);
- if (error) {
- kfree(bridge);
- goto err_out;
- }
-
- error = device_register(&bridge->dev);
- if (error) {
- put_device(&bridge->dev);
- goto err_out;
- }
- b->bridge = get_device(&bridge->dev);
- device_enable_async_suspend(b->bridge);
- pci_set_bus_of_node(b);
- pci_set_bus_msi_domain(b);
- if (!parent)
- set_dev_node(b->bridge, pcibus_to_node(b));
-
- b->dev.class = &pcibus_class;
- b->dev.parent = b->bridge;
- dev_set_name(&b->dev, "%04x:%02x", pci_domain_nr(b), bus);
- error = device_register(&b->dev);
- if (error)
- goto class_dev_reg_err;
+ list_splice_init(resources, &bridge->windows);
+ bridge->sysdata = sysdata;
+ bridge->busnr = bus;
+ bridge->ops = ops;
+ bridge->msi = msi;
- pcibios_add_bus(b);
-
- /* Create legacy_io and legacy_mem files for this bus */
- pci_create_legacy_files(b);
-
- if (parent)
- dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
- else
- printk(KERN_INFO "PCI host bridge to bus %s\n", dev_name(&b->dev));
-
- /* Add initial resources to the bus */
- resource_list_for_each_entry_safe(window, n, resources) {
- list_move_tail(&window->node, &bridge->windows);
- res = window->res;
- offset = window->offset;
- if (res->flags & IORESOURCE_BUS)
- pci_bus_insert_busn_res(b, bus, res->end);
- else
- pci_bus_add_resource(b, res, 0);
- if (offset) {
- if (resource_type(res) == IORESOURCE_IO)
- fmt = " (bus address [%#06llx-%#06llx])";
- else
- fmt = " (bus address [%#010llx-%#010llx])";
- snprintf(bus_addr, sizeof(bus_addr), fmt,
- (unsigned long long) (res->start - offset),
- (unsigned long long) (res->end - offset));
- } else
- bus_addr[0] = '\0';
- dev_info(&b->dev, "root bus resource %pR%s\n", res, bus_addr);
- }
+ error = pci_register_host_bridge(bridge);
+ if (error < 0)
+ goto err_out;
- down_write(&pci_bus_sem);
- list_add_tail(&b->node, &pci_root_buses);
- up_write(&pci_bus_sem);
+ return bridge->bus;
- return b;
-
-class_dev_reg_err:
- put_device(&bridge->dev);
- device_unregister(&bridge->dev);
err_out:
- kfree(b);
+ kfree(bridge);
return NULL;
}
+
+struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
+ struct pci_ops *ops, void *sysdata, struct list_head *resources)
+{
+ return pci_create_root_bus_msi(parent, bus, ops, sysdata, resources,
+ NULL);
+}
EXPORT_SYMBOL_GPL(pci_create_root_bus);
int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
@@ -2317,12 +2363,10 @@ struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus,
break;
}
- b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
+ b = pci_create_root_bus_msi(parent, bus, ops, sysdata, resources, msi);
if (!b)
return NULL;
- b->msi = msi;
-
if (!found) {
dev_info(&b->dev,
"No busn resource found for root bus, will use [bus %02x-ff]\n",
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0e49f70dbd9b..f79634612fbf 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -420,9 +420,13 @@ static inline int pci_channel_offline(struct pci_dev *pdev)
struct pci_host_bridge {
struct device dev;
struct pci_bus *bus; /* root bus */
+ struct pci_ops *ops;
+ void *sysdata;
+ int busnr;
struct list_head windows; /* resource_entry */
void (*release_fn)(struct pci_host_bridge *);
void *release_data;
+ struct msi_controller *msi;
unsigned int ignore_reset_delay:1; /* for entire hierarchy */
/* Resource alignment requirements */
resource_size_t (*align_resource)(struct pci_dev *dev,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-15 14:22:15 +0000