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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Sat, 15 Jun 2019 10:23:58 +1000
Subject: [PATCH 2/4] PCI: Don't auto-realloc if we're preserving firmware config
Origin: https://git.kernel.org/linus/7ac0d094fbe95bf7cc96b3066a97e1090ddc734a
Prevent auto-enabling of bridges reallocation when the FW tells us that the
initial configuration must be preserved for a given host bridge.
Link: https://lore.kernel.org/r/20190615002359.29577-3-benh@kernel.crashing.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/setup-bus.c | 5 +++++
1 file changed, 5 insertions(+)
Index: linux/drivers/pci/setup-bus.c
===================================================================
--- linux.orig/drivers/pci/setup-bus.c
+++ linux/drivers/pci/setup-bus.c
@@ -1724,10 +1724,15 @@ static enum enable_type pci_realloc_dete
enum enable_type enable_local)
{
bool unassigned = false;
+ struct pci_host_bridge *host;
if (enable_local != undefined)
return enable_local;
+ host = pci_find_host_bridge(bus);
+ if (host->preserve_config)
+ return auto_disabled;
+
pci_walk_bus(bus, iov_resources_unassigned, &unassigned);
if (unassigned)
return auto_enabled;
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