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authorNicholas Johnson <nicholas.johnson-opensource@outlook.com.au>2020-01-06 18:47:46 +0300
committerBjorn Helgaas <bhelgaas@google.com>2020-01-30 01:57:28 +0300
commitae4611f1d7e99eda6916bbc5fc8df26516edf95e (patch)
treed5fab11937c023158404e45c687edf686bfdefa8 /drivers/pci
parent1e58f4e1cb47de03988f8b14f07f6941acc7e669 (diff)
downloadlinux-ae4611f1d7e99eda6916bbc5fc8df26516edf95e.tar.xz
PCI: Set resource size directly in adjust_bridge_window()
Change adjust_bridge_window() to set resource size directly instead of using additional resource lists. Because additional resource lists are optional resources, any algorithm that requires guaranteed allocation that uses them cannot be guaranteed to work. Remove the resource from add_list, as a zero-sized additional resource is redundant. Update comment in pci_bus_distribute_available_resources() to reflect the above changes. Link: https://lore.kernel.org/r/PSXP216MB04386BA48874B56BC5CB0292803C0@PSXP216MB0438.KORP216.PROD.OUTLOOK.COM Signed-off-by: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/setup-bus.c23
1 files changed, 7 insertions, 16 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 12fe926e32b4..742055908656 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1842,7 +1842,7 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
struct list_head *add_list,
resource_size_t new_size)
{
- struct pci_dev_resource *dev_res;
+ resource_size_t add_size;
if (res->parent)
return;
@@ -1850,17 +1850,10 @@ static void adjust_bridge_window(struct pci_dev *bridge, struct resource *res,
if (resource_size(res) >= new_size)
return;
- dev_res = res_to_dev_res(add_list, res);
- if (!dev_res)
- return;
-
- /* Is there room to extend the window? */
- if (new_size - resource_size(res) <= dev_res->add_size)
- return;
-
- dev_res->add_size = new_size - resource_size(res);
- pci_dbg(bridge, "bridge window %pR extended by %pa\n", res,
- &dev_res->add_size);
+ add_size = new_size - resource_size(res);
+ pci_dbg(bridge, "bridge window %pR extended by %pa\n", res, &add_size);
+ res->end = res->start + new_size - 1;
+ remove_from_list(add_list, res);
}
static void pci_bus_distribute_available_resources(struct pci_bus *bus,
@@ -1896,10 +1889,8 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
mmio_pref.end + 1);
/*
- * Update additional resource list (add_list) to fill all the
- * extra resource space available for this port except the space
- * calculated in __pci_bus_size_bridges() which covers all the
- * devices currently connected to the port and below.
+ * Now that we have adjusted for alignment, update the bridge window
+ * resources to fill as much remaining resource space as possible.
*/
adjust_bridge_window(bridge, io_res, add_list, resource_size(&io));
adjust_bridge_window(bridge, mmio_res, add_list, resource_size(&mmio));