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PCI: conditional resource-reallocation through kernel parameter pci=realloc

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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>
This commit is contained in:
Ram Pai
2011-07-07 11:19:10 -07:00
committed by Jesse Barnes
parent a2fa83faf4
commit f483d3923d
4 changed files with 21 additions and 0 deletions
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15
drivers/pci/setup-bus.c
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@ -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;