diff options
author | Ram Pai <linuxram@us.ibm.com> | 2011-07-07 18:19:10 (GMT) |
---|---|---|
committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2011-07-08 22:49:20 (GMT) |
commit | f483d3923dc3a6394c483e28ccb3fe700bdf399e (patch) | |
tree | ef487babd0ef104e1fa8323c23050d66096c0f3a /drivers/pci/setup-bus.c | |
parent | a2fa83faf47b514ab947cea916d3691b66525073 (diff) | |
download | linux-f483d3923dc3a6394c483e28ccb3fe700bdf399e.tar.xz |
PCI: conditional resource-reallocation through kernel parameter pci=realloc
Multiple attempts to dynamically reallocate pci resources have
unfortunately lead to regressions. Though we continue to fix the
regressions and fine tune the dynamic-reallocation behavior, we have not
reached a acceptable state yet.
This patch provides a interim solution. It disables dynamic reallocation
by default, but adds the ability to enable it through pci=realloc kernel
command line parameter.
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r-- | drivers/pci/setup-bus.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 1e9e5a5..9995842 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -47,6 +47,13 @@ struct resource_list_x { (head)->next = NULL; \ } while (0) +int pci_realloc_enable = 0; +#define pci_realloc_enabled() pci_realloc_enable +void pci_realloc(void) +{ + pci_realloc_enable = 1; +} + /** * add_to_list() - add a new resource tracker to the list * @head: Head of the list @@ -1025,6 +1032,7 @@ static int __init pci_get_max_depth(void) return depth; } + /* * first try will not touch pci bridge res * second and later try will clear small leaf bridge res @@ -1068,6 +1076,13 @@ again: /* any device complain? */ if (!head.next) goto enable_and_dump; + + /* don't realloc if asked to do so */ + if (!pci_realloc_enabled()) { + free_list(resource_list_x, &head); + goto enable_and_dump; + } + failed_type = 0; for (list = head.next; list;) { failed_type |= list->flags; |