Hi Mika,
Unfortunately my system was de-racked meanwhile, so it will take few
more days for me to test this. So far I only successfully built it on
my 5.15.79 kernel. Meanwhile some comments below:
On 12.01.2023 05:59, Mika Westerberg wrote:
After division the extra resource space per hotplug bridge may not be
aligned according to the window alignment so do that before passing it
down for further distribution.
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
---
drivers/pci/setup-bus.c | 25 +++++++++++++++++++------
1 file changed, 19 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index b4096598dbcb..34a74bc581b0 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -1891,6 +1891,7 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
* resource space between hotplug bridges.
*/
for_each_pci_bridge(dev, bus) {
+ struct resource *res;
struct pci_bus *b;
b = dev->subordinate;
@@ -1902,16 +1903,28 @@ static void pci_bus_distribute_available_resources(struct pci_bus *bus,
* hotplug-capable downstream ports taking alignment into
* account.
*/
- io.end = io.start + io_per_hp - 1;
- mmio.end = mmio.start + mmio_per_hp - 1;
- mmio_pref.end = mmio_pref.start + mmio_pref_per_hp - 1;
+ res = &dev->resource[PCI_BRIDGE_IO_WINDOW];
+ align = pci_resource_alignment(dev, res);
+ io.end = align ? io.start + ALIGN_DOWN(io_per_hp, align) - 1
+ : io.start + io_per_hp - 1;
Not bug probably, but if we align x_per_b down for one bridge, we could
be able to increase it for other(s).
+
+ res = &dev->resource[PCI_BRIDGE_MEM_WINDOW];
+ align = pci_resource_alignment(dev, res);
+ mmio.end = align ? mmio.start + ALIGN_DOWN(mmio_per_hp, align) - 1
+ : mmio.start + io_per_hp - 1;
Here is a typo, it should be mmio_per_hp here ^^^.
+
+ res = &dev->resource[PCI_BRIDGE_PREF_MEM_WINDOW];
+ align = pci_resource_alignment(dev, res);
+ mmio_pref.end = align ? mmio_pref.start +
+ ALIGN_DOWN(mmio_pref_per_hp, align) - 1
+ : mmio_pref.start + mmio_pref_per_hp;
pci_bus_distribute_available_resources(b, add_list, io, mmio,
mmio_pref);
- io.start += io_per_hp;
- mmio.start += mmio_per_hp;
- mmio_pref.start += mmio_pref_per_hp;
+ io.start += io.end + 1;
+ mmio.start += mmio.end + 1;
+ mmio_pref.start += mmio_pref.end + 1;
}
}
--
Alexander Motin
