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author | Yinghai Lu <yinghai@kernel.org> | 2013-07-22 21:37:15 (GMT) |
---|---|---|
committer | Bjorn Helgaas <bhelgaas@google.com> | 2013-07-25 18:35:03 (GMT) |
commit | 967260cdb13f9c0de3cf56e305b34eb363e41d5b (patch) | |
tree | 7d977adb45121e6e10e9c412c0e8bb4ee424fdbc /drivers/pci/setup-bus.c | |
parent | fa216bf4dbe35e15044b90e7b51509768bab3d9a (diff) | |
download | linux-fsl-qoriq-967260cdb13f9c0de3cf56e305b34eb363e41d5b.tar.xz |
PCI: Enable unassigned resource reallocation on per-bus basis
pci_realloc_detect() turns on automatic resource allocation when it finds
unassigned SR-IOV resources. Previously it did this on a global basis, so
we enabled reallocation if any PCI device anywhere had an unassigned SR-IOV
resource.
This patch changes pci_realloc_detect() so it looks at a single bus, so we
can do this when a host bridge is hot-added.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r-- | drivers/pci/setup-bus.c | 42 |
1 files changed, 23 insertions, 19 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index ed1bd0c..4aaa8d5 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1354,9 +1354,9 @@ 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 __init pci_realloc_enabled(enum enable_type enable) { - return pci_realloc_enable >= user_enabled; + return enable >= user_enabled; } #if defined(CONFIG_PCI_IOV) && defined(CONFIG_PCI_REALLOC_ENABLE_AUTO) @@ -1383,24 +1383,26 @@ static int __init iov_resources_unassigned(struct pci_dev *dev, void *data) return 0; } -static void __init pci_realloc_detect(void) +static enum enable_type __init pci_realloc_detect(struct pci_bus *bus, + enum enable_type enable_local) { bool unassigned = false; - struct pci_bus *bus; - if (pci_realloc_enable != undefined) - return; + if (enable_local != undefined) + return enable_local; - list_for_each_entry(bus, &pci_root_buses, node) { - pci_walk_bus(bus, iov_resources_unassigned, &unassigned); - if (unassigned) { - pci_realloc_enable = auto_enabled; - return; - } - } + pci_walk_bus(bus, iov_resources_unassigned, &unassigned); + if (unassigned) + return auto_enabled; + + return enable_local; } #else -static void __init pci_realloc_detect(void) { } +static enum enable_type __init pci_realloc_detect(struct pci_bus *bus, + enum enable_type enable_local) +{ + return enable_local; +} #endif /* @@ -1422,10 +1424,12 @@ 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 = pci_realloc_enable; + + list_for_each_entry(bus, &pci_root_buses, node) + enable_local = pci_realloc_detect(bus, enable_local); - /* don't realloc if asked to do so */ - pci_realloc_detect(); - if (pci_realloc_enabled()) { + if (pci_realloc_enabled(enable_local)) { int max_depth = pci_get_max_depth(); pci_try_num = max_depth + 1; @@ -1457,9 +1461,9 @@ again: goto enable_and_dump; if (tried_times >= pci_try_num) { - if (pci_realloc_enable == undefined) + if (enable_local == undefined) printk(KERN_INFO "Some PCI device resources are unassigned, try booting with pci=realloc\n"); - else if (pci_realloc_enable == auto_enabled) + else if (enable_local == auto_enabled) printk(KERN_INFO "Automatically enabled pci realloc, if you have problem, try booting with pci=realloc=off\n"); free_list(&fail_head); |