diff options
author | Yinghai Lu <yinghai@kernel.org> | 2012-02-24 03:23:32 (GMT) |
---|---|---|
committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2012-02-24 17:38:59 (GMT) |
commit | b07f2ebc109b607789f648dedcff4b125f9afec6 (patch) | |
tree | 3868d50119a2ba1721914e9b53f12d996c5d45b4 /drivers/pci/setup-bus.c | |
parent | eb572e7c76f154d75f90a783924f88afc34d5fec (diff) | |
download | linux-b07f2ebc109b607789f648dedcff4b125f9afec6.tar.xz |
PCI: add a PCI resource reallocation config option
Add a new config option, PCI_REALLOC_ENABLE_AUTO, which will
automatically try to re-allocate PCI resources if PCI_IOV support is
enabled and the SR-IOV resources are unassigned. Behavior can still be
controlled using the pci=realloc= parameter.
-v2: According to Jesse, adding one CONFIG option for distribution to
disable it or enable it.
-v3: update Kconfig text (jbarnes)
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r-- | drivers/pci/setup-bus.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index e21e1c2..c9214a1 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1294,6 +1294,31 @@ static bool __init pci_realloc_enabled(void) return pci_realloc_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; + + 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; + } + } + } +#endif +} + /* * first try will not touch pci bridge res * second and later try will clear small leaf bridge res @@ -1315,6 +1340,7 @@ pci_assign_unassigned_resources(void) int pci_try_num = 1; /* don't realloc if asked to do so */ + pci_realloc_detect(); if (pci_realloc_enabled()) { int max_depth = pci_get_max_depth(); @@ -1349,6 +1375,8 @@ again: 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"); free_list(&fail_head); goto enable_and_dump; |