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path: root/drivers/pci/setup-bus.c
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Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r--drivers/pci/setup-bus.c151
1 files changed, 77 insertions, 74 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 8333c92c202..9be359594b0 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1297,7 +1297,7 @@ static void pci_bus_dump_resources(struct pci_bus *bus)
}
}
-static int __init pci_bus_get_depth(struct pci_bus *bus)
+static int pci_bus_get_depth(struct pci_bus *bus)
{
int depth = 0;
struct pci_bus *child_bus;
@@ -1312,21 +1312,6 @@ static int __init pci_bus_get_depth(struct pci_bus *bus)
return depth;
}
-static int __init pci_get_max_depth(void)
-{
- int depth = 0;
- struct pci_bus *bus;
-
- list_for_each_entry(bus, &pci_root_buses, node) {
- int ret;
-
- ret = pci_bus_get_depth(bus);
- if (ret > depth)
- depth = ret;
- }
-
- return depth;
-}
/*
* -1: undefined, will auto detect later
@@ -1343,7 +1328,7 @@ enum enable_type {
auto_enabled,
};
-static enum enable_type pci_realloc_enable __initdata = undefined;
+static enum enable_type pci_realloc_enable = undefined;
void __init pci_realloc_get_opt(char *str)
{
if (!strncmp(str, "off", 3))
@@ -1351,45 +1336,64 @@ void __init pci_realloc_get_opt(char *str)
else if (!strncmp(str, "on", 2))
pci_realloc_enable = user_enabled;
}
-static bool __init pci_realloc_enabled(void)
+static bool pci_realloc_enabled(enum enable_type enable)
{
- return pci_realloc_enable >= user_enabled;
+ return enable >= user_enabled;
}
-static void __init pci_realloc_detect(void)
-{
#if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO)
- struct pci_dev *dev = NULL;
-
- if (pci_realloc_enable != undefined)
- return;
-
- for_each_pci_dev(dev) {
- int i;
+static int iov_resources_unassigned(struct pci_dev *dev, void *data)
+{
+ int i;
+ bool *unassigned = data;
- for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
- struct resource *r = &dev->resource[i];
+ for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
+ struct resource *r = &dev->resource[i];
+ struct pci_bus_region region;
- /* Not assigned, or rejected by kernel ? */
- if (r->flags && !r->start) {
- pci_realloc_enable = auto_enabled;
+ /* Not assigned or rejected by kernel? */
+ if (!r->flags)
+ continue;
- return;
- }
+ pcibios_resource_to_bus(dev, &region, r);
+ if (!region.start) {
+ *unassigned = true;
+ return 1; /* return early from pci_walk_bus() */
}
}
-#endif
+
+ return 0;
+}
+
+static enum enable_type pci_realloc_detect(struct pci_bus *bus,
+ enum enable_type enable_local)
+{
+ bool unassigned = false;
+
+ if (enable_local != undefined)
+ return enable_local;
+
+ pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
+ if (unassigned)
+ return auto_enabled;
+
+ return enable_local;
+}
+#else
+static enum enable_type pci_realloc_detect(struct pci_bus *bus,
+ enum enable_type enable_local)
+{
+ return enable_local;
}
+#endif
/*
* first try will not touch pci bridge res
* second and later try will clear small leaf bridge res
* will stop till to the max deepth if can not find good one
*/
-void __init
-pci_assign_unassigned_resources(void)
+void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
{
- struct pci_bus *bus;
LIST_HEAD(realloc_head); /* list of resources that
want additional resources */
struct list_head *add_list = NULL;
@@ -1400,15 +1404,17 @@ pci_assign_unassigned_resources(void)
unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
IORESOURCE_PREFETCH;
int pci_try_num = 1;
+ enum enable_type enable_local;
/* don't realloc if asked to do so */
- pci_realloc_detect();
- if (pci_realloc_enabled()) {
- int max_depth = pci_get_max_depth();
+ enable_local = pci_realloc_detect(bus, pci_realloc_enable);
+ if (pci_realloc_enabled(enable_local)) {
+ int max_depth = pci_bus_get_depth(bus);
pci_try_num = max_depth + 1;
- printk(KERN_DEBUG "PCI: max bus depth: %d pci_try_num: %d\n",
- max_depth, pci_try_num);
+ dev_printk(KERN_DEBUG, &bus->dev,
+ "max bus depth: %d pci_try_num: %d\n",
+ max_depth, pci_try_num);
}
again:
@@ -1420,32 +1426,30 @@ again:
add_list = &realloc_head;
/* Depth first, calculate sizes and alignments of all
subordinate buses. */
- list_for_each_entry(bus, &pci_root_buses, node)
- __pci_bus_size_bridges(bus, add_list);
+ __pci_bus_size_bridges(bus, add_list);
/* Depth last, allocate resources and update the hardware. */
- list_for_each_entry(bus, &pci_root_buses, node)
- __pci_bus_assign_resources(bus, add_list, &fail_head);
+ __pci_bus_assign_resources(bus, add_list, &fail_head);
if (add_list)
BUG_ON(!list_empty(add_list));
tried_times++;
/* any device complain? */
if (list_empty(&fail_head))
- goto enable_and_dump;
+ goto dump;
if (tried_times >= pci_try_num) {
- if (pci_realloc_enable == undefined)
- printk(KERN_INFO "Some PCI device resources are unassigned, try booting with pci=realloc\n");
- else if (pci_realloc_enable == auto_enabled)
- printk(KERN_INFO "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
+ if (enable_local == undefined)
+ dev_info(&bus->dev, "Some PCI device resources are unassigned, try booting with pci=realloc\n");
+ else if (enable_local == auto_enabled)
+ dev_info(&bus->dev, "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n");
free_list(&fail_head);
- goto enable_and_dump;
+ goto dump;
}
- printk(KERN_DEBUG "PCI: No. %d try to assign unassigned res\n",
- tried_times + 1);
+ dev_printk(KERN_DEBUG, &bus->dev,
+ "No. %d try to assign unassigned res\n", tried_times + 1);
/* third times and later will not check if it is leaf */
if ((tried_times + 1) > 2)
@@ -1455,12 +1459,11 @@ again:
* Try to release leaf bridge's resources that doesn't fit resource of
* child device under that bridge
*/
- list_for_each_entry(fail_res, &fail_head, list) {
- bus = fail_res->dev->bus;
- pci_bus_release_bridge_resources(bus,
+ list_for_each_entry(fail_res, &fail_head, list)
+ pci_bus_release_bridge_resources(fail_res->dev->bus,
fail_res->flags & type_mask,
rel_type);
- }
+
/* restore size and flags */
list_for_each_entry(fail_res, &fail_head, list) {
struct resource *res = fail_res->res;
@@ -1475,14 +1478,17 @@ again:
goto again;
-enable_and_dump:
- /* Depth last, update the hardware. */
- list_for_each_entry(bus, &pci_root_buses, node)
- pci_enable_bridges(bus);
-
+dump:
/* dump the resource on buses */
- list_for_each_entry(bus, &pci_root_buses, node)
- pci_bus_dump_resources(bus);
+ pci_bus_dump_resources(bus);
+}
+
+void __init pci_assign_unassigned_resources(void)
+{
+ struct pci_bus *root_bus;
+
+ list_for_each_entry(root_bus, &pci_root_buses, node)
+ pci_assign_unassigned_root_bus_resources(root_bus);
}
void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
@@ -1519,13 +1525,11 @@ again:
* Try to release leaf bridge's resources that doesn't fit resource of
* child device under that bridge
*/
- list_for_each_entry(fail_res, &fail_head, list) {
- struct pci_bus *bus = fail_res->dev->bus;
- unsigned long flags = fail_res->flags;
-
- pci_bus_release_bridge_resources(bus, flags & type_mask,
+ list_for_each_entry(fail_res, &fail_head, list)
+ pci_bus_release_bridge_resources(fail_res->dev->bus,
+ fail_res->flags & type_mask,
whole_subtree);
- }
+
/* restore size and flags */
list_for_each_entry(fail_res, &fail_head, list) {
struct resource *res = fail_res->res;
@@ -1545,7 +1549,6 @@ enable_all:
if (retval)
dev_err(&bridge->dev, "Error reenabling bridge (%d)\n", retval);
pci_set_master(bridge);
- pci_enable_bridges(parent);
}
EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-18 12:29:12 +0000