| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * ACPI PCI HotPlug glue functions to ACPI CA subsystem |
| * |
| * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com) |
| * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com) |
| * Copyright (C) 2002,2003 NEC Corporation |
| * Copyright (C) 2003-2005 Matthew Wilcox (willy@infradead.org) |
| * Copyright (C) 2003-2005 Hewlett Packard |
| * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) |
| * Copyright (C) 2005 Intel Corporation |
| * |
| * All rights reserved. |
| * |
| * Send feedback to <kristen.c.accardi@intel.com> |
| * |
| */ |
| |
| /* |
| * Lifetime rules for pci_dev: |
| * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot() |
| * when the bridge is scanned and it loses a refcount when the bridge |
| * is removed. |
| * - When a P2P bridge is present, we elevate the refcount on the subordinate |
| * bus. It loses the refcount when the the driver unloads. |
| */ |
| |
| #define pr_fmt(fmt) "acpiphp_glue: " fmt |
| |
| #include <linux/module.h> |
| |
| #include <linux/kernel.h> |
| #include <linux/pci.h> |
| #include <linux/pci_hotplug.h> |
| #include <linux/pci-acpi.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/mutex.h> |
| #include <linux/slab.h> |
| #include <linux/acpi.h> |
| |
| #include "../pci.h" |
| #include "acpiphp.h" |
| |
| static LIST_HEAD(bridge_list); |
| static DEFINE_MUTEX(bridge_mutex); |
| |
| static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type); |
| static void acpiphp_post_dock_fixup(struct acpi_device *adev); |
| static void acpiphp_sanitize_bus(struct pci_bus *bus); |
| static void hotplug_event(u32 type, struct acpiphp_context *context); |
| static void free_bridge(struct kref *kref); |
| |
| /** |
| * acpiphp_init_context - Create hotplug context and grab a reference to it. |
| * @adev: ACPI device object to create the context for. |
| * |
| * Call under acpi_hp_context_lock. |
| */ |
| static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev) |
| { |
| struct acpiphp_context *context; |
| |
| context = kzalloc(sizeof(*context), GFP_KERNEL); |
| if (!context) |
| return NULL; |
| |
| context->refcount = 1; |
| context->hp.notify = acpiphp_hotplug_notify; |
| context->hp.fixup = acpiphp_post_dock_fixup; |
| acpi_set_hp_context(adev, &context->hp); |
| return context; |
| } |
| |
| /** |
| * acpiphp_get_context - Get hotplug context and grab a reference to it. |
| * @adev: ACPI device object to get the context for. |
| * |
| * Call under acpi_hp_context_lock. |
| */ |
| static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev) |
| { |
| struct acpiphp_context *context; |
| |
| if (!adev->hp) |
| return NULL; |
| |
| context = to_acpiphp_context(adev->hp); |
| context->refcount++; |
| return context; |
| } |
| |
| /** |
| * acpiphp_put_context - Drop a reference to ACPI hotplug context. |
| * @context: ACPI hotplug context to drop a reference to. |
| * |
| * The context object is removed if there are no more references to it. |
| * |
| * Call under acpi_hp_context_lock. |
| */ |
| static void acpiphp_put_context(struct acpiphp_context *context) |
| { |
| if (--context->refcount) |
| return; |
| |
| WARN_ON(context->bridge); |
| context->hp.self->hp = NULL; |
| kfree(context); |
| } |
| |
| static inline void get_bridge(struct acpiphp_bridge *bridge) |
| { |
| kref_get(&bridge->ref); |
| } |
| |
| static inline void put_bridge(struct acpiphp_bridge *bridge) |
| { |
| kref_put(&bridge->ref, free_bridge); |
| } |
| |
| static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev) |
| { |
| struct acpiphp_context *context; |
| |
| acpi_lock_hp_context(); |
| |
| context = acpiphp_get_context(adev); |
| if (!context) |
| goto unlock; |
| |
| if (context->func.parent->is_going_away) { |
| acpiphp_put_context(context); |
| context = NULL; |
| goto unlock; |
| } |
| |
| get_bridge(context->func.parent); |
| acpiphp_put_context(context); |
| |
| unlock: |
| acpi_unlock_hp_context(); |
| return context; |
| } |
| |
| static void acpiphp_let_context_go(struct acpiphp_context *context) |
| { |
| put_bridge(context->func.parent); |
| } |
| |
| static void free_bridge(struct kref *kref) |
| { |
| struct acpiphp_context *context; |
| struct acpiphp_bridge *bridge; |
| struct acpiphp_slot *slot, *next; |
| struct acpiphp_func *func, *tmp; |
| |
| acpi_lock_hp_context(); |
| |
| bridge = container_of(kref, struct acpiphp_bridge, ref); |
| |
| list_for_each_entry_safe(slot, next, &bridge->slots, node) { |
| list_for_each_entry_safe(func, tmp, &slot->funcs, sibling) |
| acpiphp_put_context(func_to_context(func)); |
| |
| kfree(slot); |
| } |
| |
| context = bridge->context; |
| /* Root bridges will not have hotplug context. */ |
| if (context) { |
| /* Release the reference taken by acpiphp_enumerate_slots(). */ |
| put_bridge(context->func.parent); |
| context->bridge = NULL; |
| acpiphp_put_context(context); |
| } |
| |
| put_device(&bridge->pci_bus->dev); |
| pci_dev_put(bridge->pci_dev); |
| kfree(bridge); |
| |
| acpi_unlock_hp_context(); |
| } |
| |
| /** |
| * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices. |
| * @adev: ACPI device object corresponding to a PCI device. |
| * |
| * TBD - figure out a way to only call fixups for systems that require them. |
| */ |
| static void acpiphp_post_dock_fixup(struct acpi_device *adev) |
| { |
| struct acpiphp_context *context = acpiphp_grab_context(adev); |
| struct pci_bus *bus; |
| u32 buses; |
| |
| if (!context) |
| return; |
| |
| bus = context->func.slot->bus; |
| if (!bus->self) |
| goto out; |
| |
| /* fixup bad _DCK function that rewrites |
| * secondary bridge on slot |
| */ |
| pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses); |
| |
| if (((buses >> 8) & 0xff) != bus->busn_res.start) { |
| buses = (buses & 0xff000000) |
| | ((unsigned int)(bus->primary) << 0) |
| | ((unsigned int)(bus->busn_res.start) << 8) |
| | ((unsigned int)(bus->busn_res.end) << 16); |
| pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses); |
| } |
| |
| out: |
| acpiphp_let_context_go(context); |
| } |
| |
| /** |
| * acpiphp_add_context - Add ACPIPHP context to an ACPI device object. |
| * @handle: ACPI handle of the object to add a context to. |
| * @lvl: Not used. |
| * @data: The object's parent ACPIPHP bridge. |
| * @rv: Not used. |
| */ |
| static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data, |
| void **rv) |
| { |
| struct acpiphp_bridge *bridge = data; |
| struct acpiphp_context *context; |
| struct acpi_device *adev; |
| struct acpiphp_slot *slot; |
| struct acpiphp_func *newfunc; |
| acpi_status status = AE_OK; |
| unsigned long long adr; |
| int device, function; |
| struct pci_bus *pbus = bridge->pci_bus; |
| struct pci_dev *pdev = bridge->pci_dev; |
| u32 val; |
| |
| status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); |
| if (ACPI_FAILURE(status)) { |
| if (status != AE_NOT_FOUND) |
| acpi_handle_warn(handle, |
| "can't evaluate _ADR (%#x)\n", status); |
| return AE_OK; |
| } |
| if (acpi_bus_get_device(handle, &adev)) |
| return AE_OK; |
| |
| device = (adr >> 16) & 0xffff; |
| function = adr & 0xffff; |
| |
| acpi_lock_hp_context(); |
| context = acpiphp_init_context(adev); |
| if (!context) { |
| acpi_unlock_hp_context(); |
| acpi_handle_err(handle, "No hotplug context\n"); |
| return AE_NOT_EXIST; |
| } |
| newfunc = &context->func; |
| newfunc->function = function; |
| newfunc->parent = bridge; |
| acpi_unlock_hp_context(); |
| |
| /* |
| * If this is a dock device, its _EJ0 should be executed by the dock |
| * notify handler after calling _DCK. |
| */ |
| if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0")) |
| newfunc->flags = FUNC_HAS_EJ0; |
| |
| if (acpi_has_method(handle, "_STA")) |
| newfunc->flags |= FUNC_HAS_STA; |
| |
| /* search for objects that share the same slot */ |
| list_for_each_entry(slot, &bridge->slots, node) |
| if (slot->device == device) |
| goto slot_found; |
| |
| slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); |
| if (!slot) { |
| acpi_lock_hp_context(); |
| acpiphp_put_context(context); |
| acpi_unlock_hp_context(); |
| return AE_NO_MEMORY; |
| } |
| |
| slot->bus = bridge->pci_bus; |
| slot->device = device; |
| INIT_LIST_HEAD(&slot->funcs); |
| |
| list_add_tail(&slot->node, &bridge->slots); |
| |
| /* |
| * Expose slots to user space for functions that have _EJ0 or _RMV or |
| * are located in dock stations. Do not expose them for devices handled |
| * by the native PCIe hotplug (PCIeHP) or standard PCI hotplug |
| * (SHPCHP), because that code is supposed to expose slots to user |
| * space in those cases. |
| */ |
| if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev)) |
| && !(pdev && hotplug_is_native(pdev))) { |
| unsigned long long sun; |
| int retval; |
| |
| bridge->nr_slots++; |
| status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); |
| if (ACPI_FAILURE(status)) |
| sun = bridge->nr_slots; |
| |
| pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n", |
| sun, pci_domain_nr(pbus), pbus->number, device); |
| |
| retval = acpiphp_register_hotplug_slot(slot, sun); |
| if (retval) { |
| slot->slot = NULL; |
| bridge->nr_slots--; |
| if (retval == -EBUSY) |
| pr_warn("Slot %llu already registered by another hotplug driver\n", sun); |
| else |
| pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval); |
| } |
| /* Even if the slot registration fails, we can still use it. */ |
| } |
| |
| slot_found: |
| newfunc->slot = slot; |
| list_add_tail(&newfunc->sibling, &slot->funcs); |
| |
| if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), |
| &val, 60*1000)) |
| slot->flags |= SLOT_ENABLED; |
| |
| return AE_OK; |
| } |
| |
| static void cleanup_bridge(struct acpiphp_bridge *bridge) |
| { |
| struct acpiphp_slot *slot; |
| struct acpiphp_func *func; |
| |
| list_for_each_entry(slot, &bridge->slots, node) { |
| list_for_each_entry(func, &slot->funcs, sibling) { |
| struct acpi_device *adev = func_to_acpi_device(func); |
| |
| acpi_lock_hp_context(); |
| adev->hp->notify = NULL; |
| adev->hp->fixup = NULL; |
| acpi_unlock_hp_context(); |
| } |
| slot->flags |= SLOT_IS_GOING_AWAY; |
| if (slot->slot) |
| acpiphp_unregister_hotplug_slot(slot); |
| } |
| |
| mutex_lock(&bridge_mutex); |
| list_del(&bridge->list); |
| mutex_unlock(&bridge_mutex); |
| |
| acpi_lock_hp_context(); |
| bridge->is_going_away = true; |
| acpi_unlock_hp_context(); |
| } |
| |
| /** |
| * acpiphp_max_busnr - return the highest reserved bus number under the given bus. |
| * @bus: bus to start search with |
| */ |
| static unsigned char acpiphp_max_busnr(struct pci_bus *bus) |
| { |
| struct pci_bus *tmp; |
| unsigned char max, n; |
| |
| /* |
| * pci_bus_max_busnr will return the highest |
| * reserved busnr for all these children. |
| * that is equivalent to the bus->subordinate |
| * value. We don't want to use the parent's |
| * bus->subordinate value because it could have |
| * padding in it. |
| */ |
| max = bus->busn_res.start; |
| |
| list_for_each_entry(tmp, &bus->children, node) { |
| n = pci_bus_max_busnr(tmp); |
| if (n > max) |
| max = n; |
| } |
| return max; |
| } |
| |
| static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) |
| { |
| struct acpiphp_func *func; |
| union acpi_object params[2]; |
| struct acpi_object_list arg_list; |
| |
| list_for_each_entry(func, &slot->funcs, sibling) { |
| arg_list.count = 2; |
| arg_list.pointer = params; |
| params[0].type = ACPI_TYPE_INTEGER; |
| params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG; |
| params[1].type = ACPI_TYPE_INTEGER; |
| params[1].integer.value = 1; |
| /* _REG is optional, we don't care about if there is failure */ |
| acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list, |
| NULL); |
| } |
| } |
| |
| static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) |
| { |
| struct acpiphp_func *func; |
| |
| /* quirk, or pcie could set it already */ |
| if (dev->is_hotplug_bridge) |
| return; |
| |
| list_for_each_entry(func, &slot->funcs, sibling) { |
| if (PCI_FUNC(dev->devfn) == func->function) { |
| dev->is_hotplug_bridge = 1; |
| break; |
| } |
| } |
| } |
| |
| static int acpiphp_rescan_slot(struct acpiphp_slot *slot) |
| { |
| struct acpiphp_func *func; |
| |
| list_for_each_entry(func, &slot->funcs, sibling) { |
| struct acpi_device *adev = func_to_acpi_device(func); |
| |
| acpi_bus_scan(adev->handle); |
| if (acpi_device_enumerated(adev)) |
| acpi_device_set_power(adev, ACPI_STATE_D0); |
| } |
| return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0)); |
| } |
| |
| static void acpiphp_native_scan_bridge(struct pci_dev *bridge) |
| { |
| struct pci_bus *bus = bridge->subordinate; |
| struct pci_dev *dev; |
| int max; |
| |
| if (!bus) |
| return; |
| |
| max = bus->busn_res.start; |
| /* Scan already configured non-hotplug bridges */ |
| for_each_pci_bridge(dev, bus) { |
| if (!hotplug_is_native(dev)) |
| max = pci_scan_bridge(bus, dev, max, 0); |
| } |
| |
| /* Scan non-hotplug bridges that need to be reconfigured */ |
| for_each_pci_bridge(dev, bus) { |
| if (hotplug_is_native(dev)) |
| continue; |
| |
| max = pci_scan_bridge(bus, dev, max, 1); |
| if (dev->subordinate) { |
| pcibios_resource_survey_bus(dev->subordinate); |
| pci_bus_size_bridges(dev->subordinate); |
| pci_bus_assign_resources(dev->subordinate); |
| } |
| } |
| } |
| |
| /** |
| * enable_slot - enable, configure a slot |
| * @slot: slot to be enabled |
| * @bridge: true if enable is for the whole bridge (not a single slot) |
| * |
| * This function should be called per *physical slot*, |
| * not per each slot object in ACPI namespace. |
| */ |
| static void enable_slot(struct acpiphp_slot *slot, bool bridge) |
| { |
| struct pci_dev *dev; |
| struct pci_bus *bus = slot->bus; |
| struct acpiphp_func *func; |
| |
| if (bridge && bus->self && hotplug_is_native(bus->self)) { |
| /* |
| * If native hotplug is used, it will take care of hotplug |
| * slot management and resource allocation for hotplug |
| * bridges. However, ACPI hotplug may still be used for |
| * non-hotplug bridges to bring in additional devices such |
| * as a Thunderbolt host controller. |
| */ |
| for_each_pci_bridge(dev, bus) { |
| if (PCI_SLOT(dev->devfn) == slot->device) |
| acpiphp_native_scan_bridge(dev); |
| } |
| } else { |
| LIST_HEAD(add_list); |
| int max, pass; |
| |
| acpiphp_rescan_slot(slot); |
| max = acpiphp_max_busnr(bus); |
| for (pass = 0; pass < 2; pass++) { |
| for_each_pci_bridge(dev, bus) { |
| if (PCI_SLOT(dev->devfn) != slot->device) |
| continue; |
| |
| max = pci_scan_bridge(bus, dev, max, pass); |
| if (pass && dev->subordinate) { |
| check_hotplug_bridge(slot, dev); |
| pcibios_resource_survey_bus(dev->subordinate); |
| __pci_bus_size_bridges(dev->subordinate, |
| &add_list); |
| } |
| } |
| } |
| __pci_bus_assign_resources(bus, &add_list, NULL); |
| } |
| |
| acpiphp_sanitize_bus(bus); |
| pcie_bus_configure_settings(bus); |
| acpiphp_set_acpi_region(slot); |
| |
| list_for_each_entry(dev, &bus->devices, bus_list) { |
| /* Assume that newly added devices are powered on already. */ |
| if (!pci_dev_is_added(dev)) |
| dev->current_state = PCI_D0; |
| } |
| |
| pci_bus_add_devices(bus); |
| |
| slot->flags |= SLOT_ENABLED; |
| list_for_each_entry(func, &slot->funcs, sibling) { |
| dev = pci_get_slot(bus, PCI_DEVFN(slot->device, |
| func->function)); |
| if (!dev) { |
| /* Do not set SLOT_ENABLED flag if some funcs |
| are not added. */ |
| slot->flags &= ~SLOT_ENABLED; |
| continue; |
| } |
| pci_dev_put(dev); |
| } |
| } |
| |
| /** |
| * disable_slot - disable a slot |
| * @slot: ACPI PHP slot |
| */ |
| static void disable_slot(struct acpiphp_slot *slot) |
| { |
| struct pci_bus *bus = slot->bus; |
| struct pci_dev *dev, *prev; |
| struct acpiphp_func *func; |
| |
| /* |
| * enable_slot() enumerates all functions in this device via |
| * pci_scan_slot(), whether they have associated ACPI hotplug |
| * methods (_EJ0, etc.) or not. Therefore, we remove all functions |
| * here. |
| */ |
| list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list) |
| if (PCI_SLOT(dev->devfn) == slot->device) |
| pci_stop_and_remove_bus_device(dev); |
| |
| list_for_each_entry(func, &slot->funcs, sibling) |
| acpi_bus_trim(func_to_acpi_device(func)); |
| |
| slot->flags &= ~SLOT_ENABLED; |
| } |
| |
| static bool slot_no_hotplug(struct acpiphp_slot *slot) |
| { |
| struct pci_bus *bus = slot->bus; |
| struct pci_dev *dev; |
| |
| list_for_each_entry(dev, &bus->devices, bus_list) { |
| if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug) |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * get_slot_status - get ACPI slot status |
| * @slot: ACPI PHP slot |
| * |
| * If a slot has _STA for each function and if any one of them |
| * returned non-zero status, return it. |
| * |
| * If a slot doesn't have _STA and if any one of its functions' |
| * configuration space is configured, return 0x0f as a _STA. |
| * |
| * Otherwise return 0. |
| */ |
| static unsigned int get_slot_status(struct acpiphp_slot *slot) |
| { |
| unsigned long long sta = 0; |
| struct acpiphp_func *func; |
| u32 dvid; |
| |
| list_for_each_entry(func, &slot->funcs, sibling) { |
| if (func->flags & FUNC_HAS_STA) { |
| acpi_status status; |
| |
| status = acpi_evaluate_integer(func_to_handle(func), |
| "_STA", NULL, &sta); |
| if (ACPI_SUCCESS(status) && sta) |
| break; |
| } else { |
| if (pci_bus_read_dev_vendor_id(slot->bus, |
| PCI_DEVFN(slot->device, func->function), |
| &dvid, 0)) { |
| sta = ACPI_STA_ALL; |
| break; |
| } |
| } |
| } |
| |
| if (!sta) { |
| /* |
| * Check for the slot itself since it may be that the |
| * ACPI slot is a device below PCIe upstream port so in |
| * that case it may not even be reachable yet. |
| */ |
| if (pci_bus_read_dev_vendor_id(slot->bus, |
| PCI_DEVFN(slot->device, 0), &dvid, 0)) { |
| sta = ACPI_STA_ALL; |
| } |
| } |
| |
| return (unsigned int)sta; |
| } |
| |
| static inline bool device_status_valid(unsigned int sta) |
| { |
| /* |
| * ACPI spec says that _STA may return bit 0 clear with bit 3 set |
| * if the device is valid but does not require a device driver to be |
| * loaded (Section 6.3.7 of ACPI 5.0A). |
| */ |
| unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING; |
| return (sta & mask) == mask; |
| } |
| |
| /** |
| * trim_stale_devices - remove PCI devices that are not responding. |
| * @dev: PCI device to start walking the hierarchy from. |
| */ |
| static void trim_stale_devices(struct pci_dev *dev) |
| { |
| struct acpi_device *adev = ACPI_COMPANION(&dev->dev); |
| struct pci_bus *bus = dev->subordinate; |
| bool alive = dev->ignore_hotplug; |
| |
| if (adev) { |
| acpi_status status; |
| unsigned long long sta; |
| |
| status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); |
| alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta)); |
| } |
| if (!alive) |
| alive = pci_device_is_present(dev); |
| |
| if (!alive) { |
| pci_dev_set_disconnected(dev, NULL); |
| if (pci_has_subordinate(dev)) |
| pci_walk_bus(dev->subordinate, pci_dev_set_disconnected, |
| NULL); |
| |
| pci_stop_and_remove_bus_device(dev); |
| if (adev) |
| acpi_bus_trim(adev); |
| } else if (bus) { |
| struct pci_dev *child, *tmp; |
| |
| /* The device is a bridge. so check the bus below it. */ |
| pm_runtime_get_sync(&dev->dev); |
| list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list) |
| trim_stale_devices(child); |
| |
| pm_runtime_put(&dev->dev); |
| } |
| } |
| |
| /** |
| * acpiphp_check_bridge - re-enumerate devices |
| * @bridge: where to begin re-enumeration |
| * |
| * Iterate over all slots under this bridge and make sure that if a |
| * card is present they are enabled, and if not they are disabled. |
| */ |
| static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) |
| { |
| struct acpiphp_slot *slot; |
| |
| /* Bail out if the bridge is going away. */ |
| if (bridge->is_going_away) |
| return; |
| |
| if (bridge->pci_dev) |
| pm_runtime_get_sync(&bridge->pci_dev->dev); |
| |
| list_for_each_entry(slot, &bridge->slots, node) { |
| struct pci_bus *bus = slot->bus; |
| struct pci_dev *dev, *tmp; |
| |
| if (slot_no_hotplug(slot)) { |
| ; /* do nothing */ |
| } else if (device_status_valid(get_slot_status(slot))) { |
| /* remove stale devices if any */ |
| list_for_each_entry_safe_reverse(dev, tmp, |
| &bus->devices, bus_list) |
| if (PCI_SLOT(dev->devfn) == slot->device) |
| trim_stale_devices(dev); |
| |
| /* configure all functions */ |
| enable_slot(slot, true); |
| } else { |
| disable_slot(slot); |
| } |
| } |
| |
| if (bridge->pci_dev) |
| pm_runtime_put(&bridge->pci_dev->dev); |
| } |
| |
| /* |
| * Remove devices for which we could not assign resources, call |
| * arch specific code to fix-up the bus |
| */ |
| static void acpiphp_sanitize_bus(struct pci_bus *bus) |
| { |
| struct pci_dev *dev, *tmp; |
| int i; |
| unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM; |
| |
| list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) { |
| for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) { |
| struct resource *res = &dev->resource[i]; |
| if ((res->flags & type_mask) && !res->start && |
| res->end) { |
| /* Could not assign a required resources |
| * for this device, remove it */ |
| pci_stop_and_remove_bus_device(dev); |
| break; |
| } |
| } |
| } |
| } |
| |
| /* |
| * ACPI event handlers |
| */ |
| |
| void acpiphp_check_host_bridge(struct acpi_device *adev) |
| { |
| struct acpiphp_bridge *bridge = NULL; |
| |
| acpi_lock_hp_context(); |
| if (adev->hp) { |
| bridge = to_acpiphp_root_context(adev->hp)->root_bridge; |
| if (bridge) |
| get_bridge(bridge); |
| } |
| acpi_unlock_hp_context(); |
| if (bridge) { |
| pci_lock_rescan_remove(); |
| |
| acpiphp_check_bridge(bridge); |
| |
| pci_unlock_rescan_remove(); |
| put_bridge(bridge); |
| } |
| } |
| |
| static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); |
| |
| static void hotplug_event(u32 type, struct acpiphp_context *context) |
| { |
| acpi_handle handle = context->hp.self->handle; |
| struct acpiphp_func *func = &context->func; |
| struct acpiphp_slot *slot = func->slot; |
| struct acpiphp_bridge *bridge; |
| |
| acpi_lock_hp_context(); |
| bridge = context->bridge; |
| if (bridge) |
| get_bridge(bridge); |
| |
| acpi_unlock_hp_context(); |
| |
| pci_lock_rescan_remove(); |
| |
| switch (type) { |
| case ACPI_NOTIFY_BUS_CHECK: |
| /* bus re-enumerate */ |
| acpi_handle_debug(handle, "Bus check in %s()\n", __func__); |
| if (bridge) |
| acpiphp_check_bridge(bridge); |
| else if (!(slot->flags & SLOT_IS_GOING_AWAY)) |
| enable_slot(slot, false); |
| |
| break; |
| |
| case ACPI_NOTIFY_DEVICE_CHECK: |
| /* device check */ |
| acpi_handle_debug(handle, "Device check in %s()\n", __func__); |
| if (bridge) { |
| acpiphp_check_bridge(bridge); |
| } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) { |
| /* |
| * Check if anything has changed in the slot and rescan |
| * from the parent if that's the case. |
| */ |
| if (acpiphp_rescan_slot(slot)) |
| acpiphp_check_bridge(func->parent); |
| } |
| break; |
| |
| case ACPI_NOTIFY_EJECT_REQUEST: |
| /* request device eject */ |
| acpi_handle_debug(handle, "Eject request in %s()\n", __func__); |
| acpiphp_disable_and_eject_slot(slot); |
| break; |
| } |
| |
| pci_unlock_rescan_remove(); |
| if (bridge) |
| put_bridge(bridge); |
| } |
| |
| static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type) |
| { |
| struct acpiphp_context *context; |
| |
| context = acpiphp_grab_context(adev); |
| if (!context) |
| return -ENODATA; |
| |
| hotplug_event(type, context); |
| acpiphp_let_context_go(context); |
| return 0; |
| } |
| |
| /** |
| * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. |
| * @bus: PCI bus to enumerate the slots for. |
| * |
| * A "slot" is an object associated with a PCI device number. All functions |
| * (PCI devices) with the same bus and device number belong to the same slot. |
| */ |
| void acpiphp_enumerate_slots(struct pci_bus *bus) |
| { |
| struct acpiphp_bridge *bridge; |
| struct acpi_device *adev; |
| acpi_handle handle; |
| acpi_status status; |
| |
| if (acpiphp_disabled) |
| return; |
| |
| adev = ACPI_COMPANION(bus->bridge); |
| if (!adev) |
| return; |
| |
| handle = adev->handle; |
| bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); |
| if (!bridge) |
| return; |
| |
| INIT_LIST_HEAD(&bridge->slots); |
| kref_init(&bridge->ref); |
| bridge->pci_dev = pci_dev_get(bus->self); |
| bridge->pci_bus = bus; |
| |
| /* |
| * Grab a ref to the subordinate PCI bus in case the bus is |
| * removed via PCI core logical hotplug. The ref pins the bus |
| * (which we access during module unload). |
| */ |
| get_device(&bus->dev); |
| |
| acpi_lock_hp_context(); |
| if (pci_is_root_bus(bridge->pci_bus)) { |
| struct acpiphp_root_context *root_context; |
| |
| root_context = kzalloc(sizeof(*root_context), GFP_KERNEL); |
| if (!root_context) |
| goto err; |
| |
| root_context->root_bridge = bridge; |
| acpi_set_hp_context(adev, &root_context->hp); |
| } else { |
| struct acpiphp_context *context; |
| |
| /* |
| * This bridge should have been registered as a hotplug function |
| * under its parent, so the context should be there, unless the |
| * parent is going to be handled by pciehp, in which case this |
| * bridge is not interesting to us either. |
| */ |
| context = acpiphp_get_context(adev); |
| if (!context) |
| goto err; |
| |
| bridge->context = context; |
| context->bridge = bridge; |
| /* Get a reference to the parent bridge. */ |
| get_bridge(context->func.parent); |
| } |
| acpi_unlock_hp_context(); |
| |
| /* Must be added to the list prior to calling acpiphp_add_context(). */ |
| mutex_lock(&bridge_mutex); |
| list_add(&bridge->list, &bridge_list); |
| mutex_unlock(&bridge_mutex); |
| |
| /* register all slot objects under this bridge */ |
| status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, |
| acpiphp_add_context, NULL, bridge, NULL); |
| if (ACPI_FAILURE(status)) { |
| acpi_handle_err(handle, "failed to register slots\n"); |
| cleanup_bridge(bridge); |
| put_bridge(bridge); |
| } |
| return; |
| |
| err: |
| acpi_unlock_hp_context(); |
| put_device(&bus->dev); |
| pci_dev_put(bridge->pci_dev); |
| kfree(bridge); |
| } |
| |
| static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge) |
| { |
| if (pci_is_root_bus(bridge->pci_bus)) { |
| struct acpiphp_root_context *root_context; |
| struct acpi_device *adev; |
| |
| acpi_lock_hp_context(); |
| adev = ACPI_COMPANION(bridge->pci_bus->bridge); |
| root_context = to_acpiphp_root_context(adev->hp); |
| adev->hp = NULL; |
| acpi_unlock_hp_context(); |
| kfree(root_context); |
| } |
| cleanup_bridge(bridge); |
| put_bridge(bridge); |
| } |
| |
| /** |
| * acpiphp_remove_slots - Remove slot objects associated with a given bus. |
| * @bus: PCI bus to remove the slot objects for. |
| */ |
| void acpiphp_remove_slots(struct pci_bus *bus) |
| { |
| struct acpiphp_bridge *bridge; |
| |
| if (acpiphp_disabled) |
| return; |
| |
| mutex_lock(&bridge_mutex); |
| list_for_each_entry(bridge, &bridge_list, list) |
| if (bridge->pci_bus == bus) { |
| mutex_unlock(&bridge_mutex); |
| acpiphp_drop_bridge(bridge); |
| return; |
| } |
| |
| mutex_unlock(&bridge_mutex); |
| } |
| |
| /** |
| * acpiphp_enable_slot - power on slot |
| * @slot: ACPI PHP slot |
| */ |
| int acpiphp_enable_slot(struct acpiphp_slot *slot) |
| { |
| pci_lock_rescan_remove(); |
| |
| if (slot->flags & SLOT_IS_GOING_AWAY) { |
| pci_unlock_rescan_remove(); |
| return -ENODEV; |
| } |
| |
| /* configure all functions */ |
| if (!(slot->flags & SLOT_ENABLED)) |
| enable_slot(slot, false); |
| |
| pci_unlock_rescan_remove(); |
| return 0; |
| } |
| |
| /** |
| * acpiphp_disable_and_eject_slot - power off and eject slot |
| * @slot: ACPI PHP slot |
| */ |
| static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) |
| { |
| struct acpiphp_func *func; |
| |
| if (slot->flags & SLOT_IS_GOING_AWAY) |
| return -ENODEV; |
| |
| /* unconfigure all functions */ |
| disable_slot(slot); |
| |
| list_for_each_entry(func, &slot->funcs, sibling) |
| if (func->flags & FUNC_HAS_EJ0) { |
| acpi_handle handle = func_to_handle(func); |
| |
| if (ACPI_FAILURE(acpi_evaluate_ej0(handle))) |
| acpi_handle_err(handle, "_EJ0 failed\n"); |
| |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int acpiphp_disable_slot(struct acpiphp_slot *slot) |
| { |
| int ret; |
| |
| /* |
| * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in |
| * acpiphp_disable_and_eject_slot() will be synchronized properly. |
| */ |
| acpi_scan_lock_acquire(); |
| pci_lock_rescan_remove(); |
| ret = acpiphp_disable_and_eject_slot(slot); |
| pci_unlock_rescan_remove(); |
| acpi_scan_lock_release(); |
| return ret; |
| } |
| |
| /* |
| * slot enabled: 1 |
| * slot disabled: 0 |
| */ |
| u8 acpiphp_get_power_status(struct acpiphp_slot *slot) |
| { |
| return (slot->flags & SLOT_ENABLED); |
| } |
| |
| /* |
| * latch open: 1 |
| * latch closed: 0 |
| */ |
| u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) |
| { |
| return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); |
| } |
| |
| /* |
| * adapter presence : 1 |
| * absence : 0 |
| */ |
| u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) |
| { |
| return !!get_slot_status(slot); |
| } |