arm64: PCI: Migrate ACPI related functions to pci-acpi.c

The functions defined in arm64 for ACPI support are required
for RISC-V also. To avoid duplication, move these functions
to common location.
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Will Deacon <will@kernel.org>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://patch.msgid.link/20240812005929.113499-2-sunilvl@ventanamicro.comSigned-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/arm64/kernel/pci.c

@@ -6,28 +6,7 @@
  * Copyright (C) 2014 ARM Ltd.
  */
 
-#include <linux/acpi.h>
-#include <linux/init.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
 #include <linux/pci.h>
-#include <linux/pci-acpi.h>
-#include <linux/pci-ecam.h>
-#include <linux/slab.h>
-
-#ifdef CONFIG_ACPI
-/*
- * Try to assign the IRQ number when probing a new device
- */
-int pcibios_alloc_irq(struct pci_dev *dev)
-{
-	if (!acpi_disabled)
-		acpi_pci_irq_enable(dev);
-
-	return 0;
-}
-#endif
 
 /*
  * raw_pci_read/write - Platform-specific PCI config space access.
@@ -61,173 +40,3 @@ int pcibus_to_node(struct pci_bus *bus)
 EXPORT_SYMBOL(pcibus_to_node);
 
 #endif
-
-#ifdef CONFIG_ACPI
-
-struct acpi_pci_generic_root_info {
-	struct acpi_pci_root_info	common;
-	struct pci_config_window	*cfg;	/* config space mapping */
-};
-
-int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
-{
-	struct pci_config_window *cfg = bus->sysdata;
-	struct acpi_device *adev = to_acpi_device(cfg->parent);
-	struct acpi_pci_root *root = acpi_driver_data(adev);
-
-	return root->segment;
-}
-
-int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
-{
-	struct pci_config_window *cfg;
-	struct acpi_device *adev;
-	struct device *bus_dev;
-
-	if (acpi_disabled)
-		return 0;
-
-	cfg = bridge->bus->sysdata;
-
-	/*
-	 * On Hyper-V there is no corresponding ACPI device for a root bridge,
-	 * therefore ->parent is set as NULL by the driver. And set 'adev' as
-	 * NULL in this case because there is no proper ACPI device.
-	 */
-	if (!cfg->parent)
-		adev = NULL;
-	else
-		adev = to_acpi_device(cfg->parent);
-
-	bus_dev = &bridge->bus->dev;
-
-	ACPI_COMPANION_SET(&bridge->dev, adev);
-	set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
-
-	return 0;
-}
-
-static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
-{
-	struct resource_entry *entry, *tmp;
-	int status;
-
-	status = acpi_pci_probe_root_resources(ci);
-	resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
-		if (!(entry->res->flags & IORESOURCE_WINDOW))
-			resource_list_destroy_entry(entry);
-	}
-	return status;
-}
-
-/*
- * Lookup the bus range for the domain in MCFG, and set up config space
- * mapping.
- */
-static struct pci_config_window *
-pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
-{
-	struct device *dev = &root->device->dev;
-	struct resource *bus_res = &root->secondary;
-	u16 seg = root->segment;
-	const struct pci_ecam_ops *ecam_ops;
-	struct resource cfgres;
-	struct acpi_device *adev;
-	struct pci_config_window *cfg;
-	int ret;
-
-	ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
-	if (ret) {
-		dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
-		return NULL;
-	}
-
-	adev = acpi_resource_consumer(&cfgres);
-	if (adev)
-		dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
-			 dev_name(&adev->dev));
-	else
-		dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
-			 &cfgres);
-
-	cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
-	if (IS_ERR(cfg)) {
-		dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
-			PTR_ERR(cfg));
-		return NULL;
-	}
-
-	return cfg;
-}
-
-/* release_info: free resources allocated by init_info */
-static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
-{
-	struct acpi_pci_generic_root_info *ri;
-
-	ri = container_of(ci, struct acpi_pci_generic_root_info, common);
-	pci_ecam_free(ri->cfg);
-	kfree(ci->ops);
-	kfree(ri);
-}
-
-/* Interface called from ACPI code to setup PCI host controller */
-struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
-{
-	struct acpi_pci_generic_root_info *ri;
-	struct pci_bus *bus, *child;
-	struct acpi_pci_root_ops *root_ops;
-	struct pci_host_bridge *host;
-
-	ri = kzalloc(sizeof(*ri), GFP_KERNEL);
-	if (!ri)
-		return NULL;
-
-	root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
-	if (!root_ops) {
-		kfree(ri);
-		return NULL;
-	}
-
-	ri->cfg = pci_acpi_setup_ecam_mapping(root);
-	if (!ri->cfg) {
-		kfree(ri);
-		kfree(root_ops);
-		return NULL;
-	}
-
-	root_ops->release_info = pci_acpi_generic_release_info;
-	root_ops->prepare_resources = pci_acpi_root_prepare_resources;
-	root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
-	bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
-	if (!bus)
-		return NULL;
-
-	/* If we must preserve the resource configuration, claim now */
-	host = pci_find_host_bridge(bus);
-	if (host->preserve_config)
-		pci_bus_claim_resources(bus);
-
-	/*
-	 * Assign whatever was left unassigned. If we didn't claim above,
-	 * this will reassign everything.
-	 */
-	pci_assign_unassigned_root_bus_resources(bus);
-
-	list_for_each_entry(child, &bus->children, node)
-		pcie_bus_configure_settings(child);
-
-	return bus;
-}
-
-void pcibios_add_bus(struct pci_bus *bus)
-{
-	acpi_pci_add_bus(bus);
-}
-
-void pcibios_remove_bus(struct pci_bus *bus)
-{
-	acpi_pci_remove_bus(bus);
-}
-
-#endif

drivers/pci/pci-acpi.c

@@ -15,6 +15,7 @@
 #include <linux/pci_hotplug.h>
 #include <linux/module.h>
 #include <linux/pci-acpi.h>
+#include <linux/pci-ecam.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_qos.h>
 #include <linux/rwsem.h>
@@ -1541,3 +1542,184 @@ static int __init acpi_pci_init(void)
 	return 0;
 }
 arch_initcall(acpi_pci_init);
+
+#if defined(CONFIG_ARM64)
+
+/*
+ * Try to assign the IRQ number when probing a new device
+ */
+int pcibios_alloc_irq(struct pci_dev *dev)
+{
+	if (!acpi_disabled)
+		acpi_pci_irq_enable(dev);
+
+	return 0;
+}
+
+struct acpi_pci_generic_root_info {
+	struct acpi_pci_root_info	common;
+	struct pci_config_window	*cfg;	/* config space mapping */
+};
+
+int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
+{
+	struct pci_config_window *cfg = bus->sysdata;
+	struct acpi_device *adev = to_acpi_device(cfg->parent);
+	struct acpi_pci_root *root = acpi_driver_data(adev);
+
+	return root->segment;
+}
+
+int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+	struct pci_config_window *cfg;
+	struct acpi_device *adev;
+	struct device *bus_dev;
+
+	if (acpi_disabled)
+		return 0;
+
+	cfg = bridge->bus->sysdata;
+
+	/*
+	 * On Hyper-V there is no corresponding ACPI device for a root bridge,
+	 * therefore ->parent is set as NULL by the driver. And set 'adev' as
+	 * NULL in this case because there is no proper ACPI device.
+	 */
+	if (!cfg->parent)
+		adev = NULL;
+	else
+		adev = to_acpi_device(cfg->parent);
+
+	bus_dev = &bridge->bus->dev;
+
+	ACPI_COMPANION_SET(&bridge->dev, adev);
+	set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
+
+	return 0;
+}
+
+static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
+{
+	struct resource_entry *entry, *tmp;
+	int status;
+
+	status = acpi_pci_probe_root_resources(ci);
+	resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+		if (!(entry->res->flags & IORESOURCE_WINDOW))
+			resource_list_destroy_entry(entry);
+	}
+	return status;
+}
+
+/*
+ * Lookup the bus range for the domain in MCFG, and set up config space
+ * mapping.
+ */
+static struct pci_config_window *
+pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
+{
+	struct device *dev = &root->device->dev;
+	struct resource *bus_res = &root->secondary;
+	u16 seg = root->segment;
+	const struct pci_ecam_ops *ecam_ops;
+	struct resource cfgres;
+	struct acpi_device *adev;
+	struct pci_config_window *cfg;
+	int ret;
+
+	ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
+	if (ret) {
+		dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
+		return NULL;
+	}
+
+	adev = acpi_resource_consumer(&cfgres);
+	if (adev)
+		dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
+			 dev_name(&adev->dev));
+	else
+		dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
+			 &cfgres);
+
+	cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
+	if (IS_ERR(cfg)) {
+		dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
+			PTR_ERR(cfg));
+		return NULL;
+	}
+
+	return cfg;
+}
+
+/* release_info: free resources allocated by init_info */
+static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
+{
+	struct acpi_pci_generic_root_info *ri;
+
+	ri = container_of(ci, struct acpi_pci_generic_root_info, common);
+	pci_ecam_free(ri->cfg);
+	kfree(ci->ops);
+	kfree(ri);
+}
+
+/* Interface called from ACPI code to setup PCI host controller */
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+	struct acpi_pci_generic_root_info *ri;
+	struct pci_bus *bus, *child;
+	struct acpi_pci_root_ops *root_ops;
+	struct pci_host_bridge *host;
+
+	ri = kzalloc(sizeof(*ri), GFP_KERNEL);
+	if (!ri)
+		return NULL;
+
+	root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
+	if (!root_ops) {
+		kfree(ri);
+		return NULL;
+	}
+
+	ri->cfg = pci_acpi_setup_ecam_mapping(root);
+	if (!ri->cfg) {
+		kfree(ri);
+		kfree(root_ops);
+		return NULL;
+	}
+
+	root_ops->release_info = pci_acpi_generic_release_info;
+	root_ops->prepare_resources = pci_acpi_root_prepare_resources;
+	root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
+	bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
+	if (!bus)
+		return NULL;
+
+	/* If we must preserve the resource configuration, claim now */
+	host = pci_find_host_bridge(bus);
+	if (host->preserve_config)
+		pci_bus_claim_resources(bus);
+
+	/*
+	 * Assign whatever was left unassigned. If we didn't claim above,
+	 * this will reassign everything.
+	 */
+	pci_assign_unassigned_root_bus_resources(bus);
+
+	list_for_each_entry(child, &bus->children, node)
+		pcie_bus_configure_settings(child);
+
+	return bus;
+}
+
+void pcibios_add_bus(struct pci_bus *bus)
+{
+	acpi_pci_add_bus(bus);
+}
+
+void pcibios_remove_bus(struct pci_bus *bus)
+{
+	acpi_pci_remove_bus(bus);
+}
+
+#endif