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Merge branch 'pci/yinghai-assign-unassigned-v6' into next

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* pci/yinghai-assign-unassigned-v6:
  PCI: Assign resources for hot-added host bridge more aggressively
  PCI: Move resource reallocation code to non-__init
  PCI: Delay enabling bridges until they're needed
  PCI: Assign resources on a per-bus basis
  PCI: Enable unassigned resource reallocation on per-bus basis
  PCI: Turn on reallocation for unassigned resources with host bridge offset
  PCI: Look for unassigned resources on per-bus basis
  PCI: Drop temporary variable in pci_assign_unassigned_resources()
This commit is contained in:
Bjorn Helgaas
2013-08-26 15:40:03 -06:00
parent 7d8c4a2c5a 39772038ea
commit 1193725f54
13 changed files with 99 additions and 110 deletions
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151
drivers/pci/setup-bus.c
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@@ -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;
static int iov_resources_unassigned(struct pci_dev *dev, void *data)
{
int i;
bool *unassigned = data;
if (pci_realloc_enable != undefined)
return;
for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
struct resource *r = &dev->resource[i];
struct pci_bus_region region;
for_each_pci_dev(dev) {
int i;
/* Not assigned or rejected by kernel? */
if (!r->flags)
continue;
for (i = PCI_IOV_RESOURCES; i <= PCI_IOV_RESOURCE_END; i++) {
struct resource *r = &dev->resource[i];
/* Not assigned, or rejected by kernel ? */
if (r->flags && !r->start) {
pci_realloc_enable = auto_enabled;
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);