PCI: ACPI: PM: Do not use pci_platform_pm_ops for ACPI

Using struct pci_platform_pm_ops for ACPI adds unnecessary
indirection to the interactions between the PCI core and ACPI PM,
which is also subject to retpolines.

Moreover, it is not particularly clear from the current code that,
as far as PCI PM is concerned, "platform" really means just ACPI
except for the special casess when Intel MID PCI PM is used or when
ACPI support is disabled (through the kernel config or command line,
or because there are no usable ACPI tables on the system).

To address the above, rework the PCI PM code to invoke ACPI PM
functions directly as needed and drop the acpi_pci_platform_pm
object that is not necessary any more.

Accordingly, update some of the ACPI PM functions in question to do
extra checks in case the ACPI support is disabled (which previously
was taken care of by avoiding to set the pci_platform_ops pointer
in those cases).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Tested-by: Ferry Toth <fntoth@gmail.com>

1 files changed, 37 insertions, 1 deletions

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 0cbade42ea48..e6fc14d87a07 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -725,17 +725,53 @@ int pci_acpi_program_hp_params(struct pci_dev *dev);
 extern const struct attribute_group pci_dev_acpi_attr_group;
 void pci_set_acpi_fwnode(struct pci_dev *dev);
 int pci_dev_acpi_reset(struct pci_dev *dev, bool probe);
+bool acpi_pci_power_manageable(struct pci_dev *dev);
+bool acpi_pci_bridge_d3(struct pci_dev *dev);
+int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state);
+pci_power_t acpi_pci_get_power_state(struct pci_dev *dev);
+void acpi_pci_refresh_power_state(struct pci_dev *dev);
+int acpi_pci_wakeup(struct pci_dev *dev, bool enable);
+bool acpi_pci_need_resume(struct pci_dev *dev);
+pci_power_t acpi_pci_choose_state(struct pci_dev *pdev);
 #else
 static inline int pci_dev_acpi_reset(struct pci_dev *dev, bool probe)
 {
 	return -ENOTTY;
 }
-
 static inline void pci_set_acpi_fwnode(struct pci_dev *dev) {}
 static inline int pci_acpi_program_hp_params(struct pci_dev *dev)
 {
 	return -ENODEV;
 }
+static inline bool acpi_pci_power_manageable(struct pci_dev *dev)
+{
+	return false;
+}
+static inline bool acpi_pci_bridge_d3(struct pci_dev *dev)
+{
+	return false;
+}
+static inline int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
+{
+	return -ENODEV;
+}
+static inline pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
+{
+	return PCI_UNKNOWN;
+}
+static inline void acpi_pci_refresh_power_state(struct pci_dev *dev) {}
+static inline int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
+{
+	return -ENODEV;
+}
+static inline bool acpi_pci_need_resume(struct pci_dev *dev)
+{
+	return false;
+}
+static inline pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
+{
+	return PCI_POWER_ERROR;
+}
 #endif
 
 #ifdef CONFIG_PCIEASPM