diff mbox series

[v15,2/4] PCI/ACPI: Tidy _OSC control bit checking

Message ID 20261002211828.1293177-3-sathyanarayanan.kuppuswamy@linux.intel.com
State New
Headers show
Series Simplify PCIe native ownership | expand

Commit Message

Kuppuswamy Sathyanarayanan Oct. 2, 2026, 9:18 p.m. UTC 
Add OSC_OWNER() helper to prettify checking the _OSC control bits to learn
whether the platform has granted us control of PCI features.  No functional
change intended.

[bhelgaas: split to separate patch, commit log]
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki (Intel) <rafael@kernel.org>
---
Changes since v14

 * No change.

v14 posting
https://lore.kernel.org/r/20260922204548.3884906-1-sathyanarayanan.kuppuswamy@linux.intel.com

Changes since v13

 * No change.  Picked up Rafael's Acked-by.

v13 posting
https://lore.kernel.org/r/20260919162655.3499010-1-sathyanarayanan.kuppuswamy@linux.intel.com

 drivers/acpi/pci_root.c | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

Comments

sashiko-bot@kernel.org Oct. 3, 2026, 1:33 a.m. UTC | #1 
> Add OSC_OWNER() helper to prettify checking the _OSC control bits to learn
> whether the platform has granted us control of PCI features.  No functional
> change intended.
> 
> [bhelgaas: split to separate patch, commit log]
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Sashiko has reviewed this patch and found no issues. It looks great!
diff mbox series

Patch

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 88c65f34e305..756dc2f055f5 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -993,6 +993,12 @@  static void acpi_pci_root_release_info(struct pci_host_bridge *bridge)
 	__acpi_pci_root_release_info(bridge->release_data);
 }
 
+#define OSC_OWNER(ctrl, bit, flag)		\
+	do {					\
+		if (!((ctrl) & (bit)))		\
+			flag = 0;		\
+	} while (0)
+
 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 				     struct acpi_pci_root_ops *ops,
 				     struct acpi_pci_root_info *info,
@@ -1003,6 +1009,7 @@  struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 	int node = acpi_get_node(device->handle);
 	struct pci_bus *bus;
 	struct pci_host_bridge *host_bridge;
+	u32 ctrl, ext_ctrl;
 
 	info->root = root;
 	info->bridge = device;
@@ -1028,21 +1035,21 @@  struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 		goto out_release_info;
 
 	host_bridge = to_pci_host_bridge(bus->bridge);
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
-		host_bridge->native_pcie_hotplug = 0;
-	if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))
-		host_bridge->native_shpc_hotplug = 0;
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL))
-		host_bridge->native_aer = 0;
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL))
-		host_bridge->native_pme = 0;
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))
-		host_bridge->native_ltr = 0;
-	if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL))
-		host_bridge->native_dpc = 0;
-
-	if (!(root->osc_ext_control_set & OSC_CXL_ERROR_REPORTING_CONTROL))
-		host_bridge->native_cxl_error = 0;
+
+	ctrl = root->osc_control_set;
+	ext_ctrl = root->osc_ext_control_set;
+
+	OSC_OWNER(ctrl, OSC_PCI_EXPRESS_NATIVE_HP_CONTROL,
+		  host_bridge->native_pcie_hotplug);
+	OSC_OWNER(ctrl, OSC_PCI_SHPC_NATIVE_HP_CONTROL,
+		  host_bridge->native_shpc_hotplug);
+	OSC_OWNER(ctrl, OSC_PCI_EXPRESS_AER_CONTROL, host_bridge->native_aer);
+	OSC_OWNER(ctrl, OSC_PCI_EXPRESS_PME_CONTROL, host_bridge->native_pme);
+	OSC_OWNER(ctrl, OSC_PCI_EXPRESS_LTR_CONTROL, host_bridge->native_ltr);
+	OSC_OWNER(ctrl, OSC_PCI_EXPRESS_DPC_CONTROL, host_bridge->native_dpc);
+
+	OSC_OWNER(ext_ctrl, OSC_CXL_ERROR_REPORTING_CONTROL,
+		  host_bridge->native_cxl_error);
 
 	acpi_dev_power_up_children_with_adr(device);