PCI/ACPI: Request _OSC control once for each root bridge (v3)

Move the evaluation of acpi_pci_osc_control_set() (to request control of
PCI Express native features) into acpi_pci_root_add() to avoid calling
it many times for the same root complex with the same arguments.
Additionally, check if all of the requisite _OSC support bits are set
before calling acpi_pci_osc_control_set() for a given root complex.

References: https://bugzilla.kernel.org/show_bug.cgi?id=20232
Reported-by: Ozan Caglayan <ozan@pardus.org.tr>
Tested-by: Ozan Caglayan <ozan@pardus.org.tr>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 63cbadce337e..12dd86a82a15 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -994,6 +994,9 @@ extern void pci_restore_msi_state(struct pci_dev *dev);
 extern int pci_msi_enabled(void);
 #endif
 
+extern bool pcie_ports_disabled;
+extern bool pcie_ports_auto;
+
 #ifndef CONFIG_PCIEASPM
 static inline int pcie_aspm_enabled(void)
 {
@@ -1003,6 +1006,14 @@ static inline int pcie_aspm_enabled(void)
 extern int pcie_aspm_enabled(void);
 #endif
 
+#ifdef CONFIG_PCIEAER
+void pci_no_aer(void);
+bool pci_aer_available(void);
+#else
+static inline void pci_no_aer(void) { }
+static inline bool pci_aer_available(void) { return false; }
+#endif
+
 #ifndef CONFIG_PCIE_ECRC
 static inline void pcie_set_ecrc_checking(struct pci_dev *dev)
 {