diff options
Diffstat (limited to 'drivers/pci/hotplug/acpiphp_glue.c')
| -rw-r--r-- | drivers/pci/hotplug/acpiphp_glue.c | 1748 |
1 files changed, 730 insertions, 1018 deletions
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index e7f41294f81..602d153c705 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -4,6 +4,10 @@ * 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 (matthew.wilcox@hp.com) + * Copyright (C) 2003-2005 Hewlett Packard + * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com) + * Copyright (C) 2005 Intel Corporation * * All rights reserved. * @@ -22,890 +26,598 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * - * Send feedback to <t-kochi@bq.jp.nec.com> + * Send feedback to <kristen.c.accardi@intel.com> * */ -#include <linux/init.h> +/* + * 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/smp_lock.h> -#include <asm/semaphore.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 "pci_hotplug.h" #include "acpiphp.h" static LIST_HEAD(bridge_list); +static DEFINE_MUTEX(bridge_mutex); -#define MY_NAME "acpiphp_glue" - -static void handle_hotplug_event_bridge (acpi_handle, u32, void *); -static void handle_hotplug_event_func (acpi_handle, u32, void *); - -/* - * initialization & terminatation routines - */ +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 acpiphp_set_hpp_values(struct pci_bus *bus); +static void hotplug_event(u32 type, struct acpiphp_context *context); +static void free_bridge(struct kref *kref); /** - * is_ejectable - determine if a slot is ejectable - * @handle: handle to acpi namespace - * - * Ejectable slot should satisfy at least these conditions: - * - * 1. has _ADR method - * 2. has _EJ0 method - * - * optionally - * - * 1. has _STA method - * 2. has _PS0 method - * 3. has _PS3 method - * 4. .. + * 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 int is_ejectable(acpi_handle handle) +static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev) { - acpi_status status; - acpi_handle tmp; + struct acpiphp_context *context; - status = acpi_get_handle(handle, "_ADR", &tmp); - if (ACPI_FAILURE(status)) { - return 0; - } + context = kzalloc(sizeof(*context), GFP_KERNEL); + if (!context) + return NULL; - status = acpi_get_handle(handle, "_EJ0", &tmp); - if (ACPI_FAILURE(status)) { - return 0; - } - - return 1; + context->refcount = 1; + acpi_set_hp_context(adev, &context->hp, acpiphp_hotplug_notify, NULL, + acpiphp_post_dock_fixup); + return context; } - -/* callback routine to check the existence of ejectable slots */ -static acpi_status -is_ejectable_slot(acpi_handle handle, u32 lvl, void *context, void **rv) +/** + * 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) { - int *count = (int *)context; + struct acpiphp_context *context; - if (is_ejectable(handle)) { - (*count)++; - /* only one ejectable slot is enough */ - return AE_CTRL_TERMINATE; - } else { - return AE_OK; - } -} + if (!adev->hp) + return NULL; + context = to_acpiphp_context(adev->hp); + context->refcount++; + return context; +} -/* callback routine to register each ACPI PCI slot object */ -static acpi_status -register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) +/** + * 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) { - struct acpiphp_bridge *bridge = (struct acpiphp_bridge *)context; - struct acpiphp_slot *slot; - struct acpiphp_func *newfunc; - acpi_handle tmp; - acpi_status status = AE_OK; - unsigned long adr, sun; - int device, function; - static int num_slots = 0; /* XXX if we support I/O node hotplug... */ - - status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); - - if (ACPI_FAILURE(status)) - return AE_OK; - - status = acpi_get_handle(handle, "_EJ0", &tmp); - - if (ACPI_FAILURE(status)) - return AE_OK; - - device = (adr >> 16) & 0xffff; - function = adr & 0xffff; - - newfunc = kmalloc(sizeof(struct acpiphp_func), GFP_KERNEL); - if (!newfunc) - return AE_NO_MEMORY; - memset(newfunc, 0, sizeof(struct acpiphp_func)); - - INIT_LIST_HEAD(&newfunc->sibling); - newfunc->handle = handle; - newfunc->function = function; - newfunc->flags = FUNC_HAS_EJ0; - - if (ACPI_SUCCESS(acpi_get_handle(handle, "_STA", &tmp))) - newfunc->flags |= FUNC_HAS_STA; - - if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS0", &tmp))) - newfunc->flags |= FUNC_HAS_PS0; - - if (ACPI_SUCCESS(acpi_get_handle(handle, "_PS3", &tmp))) - newfunc->flags |= FUNC_HAS_PS3; - - status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun); - if (ACPI_FAILURE(status)) - sun = -1; - - /* search for objects that share the same slot */ - for (slot = bridge->slots; slot; slot = slot->next) - if (slot->device == device) { - if (slot->sun != sun) - warn("sibling found, but _SUN doesn't match!\n"); - break; - } - - if (!slot) { - slot = kmalloc(sizeof(struct acpiphp_slot), GFP_KERNEL); - if (!slot) { - kfree(newfunc); - return AE_NO_MEMORY; - } - - memset(slot, 0, sizeof(struct acpiphp_slot)); - slot->bridge = bridge; - slot->id = num_slots++; - slot->device = device; - slot->sun = sun; - INIT_LIST_HEAD(&slot->funcs); - init_MUTEX(&slot->crit_sect); - - slot->next = bridge->slots; - bridge->slots = slot; - - bridge->nr_slots++; - - dbg("found ACPI PCI Hotplug slot at PCI %02x:%02x Slot:%d\n", - slot->bridge->bus, slot->device, slot->sun); - } - - newfunc->slot = slot; - list_add_tail(&newfunc->sibling, &slot->funcs); - - /* associate corresponding pci_dev */ - newfunc->pci_dev = pci_find_slot(bridge->bus, - PCI_DEVFN(device, function)); - if (newfunc->pci_dev) { - if (acpiphp_init_func_resource(newfunc) < 0) { - kfree(newfunc); - return AE_ERROR; - } - slot->flags |= (SLOT_ENABLED | SLOT_POWEREDON); - } - - /* install notify handler */ - status = acpi_install_notify_handler(handle, - ACPI_SYSTEM_NOTIFY, - handle_hotplug_event_func, - newfunc); - - if (ACPI_FAILURE(status)) { - err("failed to register interrupt notify handler\n"); - return status; - } + if (--context->refcount) + return; - return AE_OK; + WARN_ON(context->bridge); + context->hp.self->hp = NULL; + kfree(context); } - -/* see if it's worth looking at this bridge */ -static int detect_ejectable_slots(acpi_handle *bridge_handle) +static inline void get_bridge(struct acpiphp_bridge *bridge) { - acpi_status status; - int count; - - count = 0; - - /* only check slots defined directly below bridge object */ - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge_handle, (u32)1, - is_ejectable_slot, (void *)&count, NULL); - - return count; + kref_get(&bridge->ref); } - -/* decode ACPI _CRS data and convert into our internal resource list - * TBD: _TRA, etc. - */ -static acpi_status -decode_acpi_resource(struct acpi_resource *resource, void *context) +static inline void put_bridge(struct acpiphp_bridge *bridge) { - struct acpiphp_bridge *bridge = (struct acpiphp_bridge *) context; - struct acpi_resource_address64 address; - struct pci_resource *res; - - if (resource->id != ACPI_RSTYPE_ADDRESS16 && - resource->id != ACPI_RSTYPE_ADDRESS32 && - resource->id != ACPI_RSTYPE_ADDRESS64) - return AE_OK; + kref_put(&bridge->ref, free_bridge); +} - acpi_resource_to_address64(resource, &address); - - if (address.producer_consumer == ACPI_PRODUCER && address.address_length > 0) { - dbg("resource type: %d: 0x%llx - 0x%llx\n", address.resource_type, - (unsigned long long)address.min_address_range, - (unsigned long long)address.max_address_range); - res = acpiphp_make_resource(address.min_address_range, - address.address_length); - if (!res) { - err("out of memory\n"); - return AE_OK; - } +static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev) +{ + struct acpiphp_context *context; - switch (address.resource_type) { - case ACPI_MEMORY_RANGE: - if (address.attribute.memory.cache_attribute == ACPI_PREFETCHABLE_MEMORY) { - res->next = bridge->p_mem_head; - bridge->p_mem_head = res; - } else { - res->next = bridge->mem_head; - bridge->mem_head = res; - } - break; - case ACPI_IO_RANGE: - res->next = bridge->io_head; - bridge->io_head = res; - break; - case ACPI_BUS_NUMBER_RANGE: - res->next = bridge->bus_head; - bridge->bus_head = res; - break; - default: - /* invalid type */ - kfree(res); - break; - } + acpi_lock_hp_context(); + context = acpiphp_get_context(adev); + if (!context || context->func.parent->is_going_away) { + acpi_unlock_hp_context(); + return NULL; } - - return AE_OK; + get_bridge(context->func.parent); + acpiphp_put_context(context); + acpi_unlock_hp_context(); + return context; } -/* decode ACPI 2.0 _HPP hot plug parameters */ -static void decode_hpp(struct acpiphp_bridge *bridge) +static void acpiphp_let_context_go(struct acpiphp_context *context) { - acpi_status status; - struct acpi_buffer buffer = { .length = ACPI_ALLOCATE_BUFFER, - .pointer = NULL}; - union acpi_object *package; - int i; + put_bridge(context->func.parent); +} - /* default numbers */ - bridge->hpp.cache_line_size = 0x10; - bridge->hpp.latency_timer = 0x40; - bridge->hpp.enable_SERR = 0; - bridge->hpp.enable_PERR = 0; +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; - status = acpi_evaluate_object(bridge->handle, "_HPP", NULL, &buffer); + acpi_lock_hp_context(); - if (ACPI_FAILURE(status)) { - dbg("_HPP evaluation failed\n"); - return; - } + bridge = container_of(kref, struct acpiphp_bridge, ref); - package = (union acpi_object *) buffer.pointer; + 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)); - if (!package || package->type != ACPI_TYPE_PACKAGE || - package->package.count != 4 || !package->package.elements) { - err("invalid _HPP object; ignoring\n"); - goto err_exit; + kfree(slot); } - for (i = 0; i < 4; i++) { - if (package->package.elements[i].type != ACPI_TYPE_INTEGER) { - err("invalid _HPP parameter type; ignoring\n"); - goto err_exit; - } + 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); } - bridge->hpp.cache_line_size = package->package.elements[0].integer.value; - bridge->hpp.latency_timer = package->package.elements[1].integer.value; - bridge->hpp.enable_SERR = package->package.elements[2].integer.value; - bridge->hpp.enable_PERR = package->package.elements[3].integer.value; - - dbg("_HPP parameter = (%02x, %02x, %02x, %02x)\n", - bridge->hpp.cache_line_size, - bridge->hpp.latency_timer, - bridge->hpp.enable_SERR, - bridge->hpp.enable_PERR); + put_device(&bridge->pci_bus->dev); + pci_dev_put(bridge->pci_dev); + kfree(bridge); - bridge->flags |= BRIDGE_HAS_HPP; - - err_exit: - kfree(buffer.pointer); + acpi_unlock_hp_context(); } - -/* initialize miscellaneous stuff for both root and PCI-to-PCI bridge */ -static void init_bridge_misc(struct acpiphp_bridge *bridge) +/** + * 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) { - acpi_status status; - - /* decode ACPI 2.0 _HPP (hot plug parameters) */ - decode_hpp(bridge); + struct acpiphp_context *context = acpiphp_grab_context(adev); + struct pci_bus *bus; + u32 buses; - /* subtract all resources already allocated */ - acpiphp_detect_pci_resource(bridge); - - /* register all slot objects under this bridge */ - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, bridge->handle, (u32)1, - register_slot, bridge, NULL); + if (!context) + return; - /* install notify handler */ - status = acpi_install_notify_handler(bridge->handle, - ACPI_SYSTEM_NOTIFY, - handle_hotplug_event_bridge, - bridge); + bus = context->func.slot->bus; + if (!bus->self) + goto out; - if (ACPI_FAILURE(status)) { - err("failed to register interrupt notify handler\n"); + /* 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); } - list_add(&bridge->list, &bridge_list); - - dbg("Bridge resource:\n"); - acpiphp_dump_resource(bridge); + out: + acpiphp_let_context_go(context); } - -/* allocate and initialize host bridge data structure */ -static void add_host_bridge(acpi_handle *handle, int seg, int bus) +/* Check whether the PCI device is managed by native PCIe hotplug driver */ +static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev) { - acpi_status status; - struct acpiphp_bridge *bridge; - - bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); - if (bridge == NULL) - return; - - memset(bridge, 0, sizeof(struct acpiphp_bridge)); - - bridge->type = BRIDGE_TYPE_HOST; - bridge->handle = handle; - bridge->seg = seg; - bridge->bus = bus; - - bridge->pci_bus = pci_find_bus(seg, bus); - - spin_lock_init(&bridge->res_lock); + u32 reg32; + acpi_handle tmp; + struct acpi_pci_root *root; - /* to be overridden when we decode _CRS */ - bridge->sub = bridge->bus; + /* Check whether the PCIe port supports native PCIe hotplug */ + if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32)) + return false; + if (!(reg32 & PCI_EXP_SLTCAP_HPC)) + return false; - /* decode resources */ + /* + * Check whether native PCIe hotplug has been enabled for + * this PCIe hierarchy. + */ + tmp = acpi_find_root_bridge_handle(pdev); + if (!tmp) + return false; + root = acpi_pci_find_root(tmp); + if (!root) + return false; + if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) + return false; + + return true; +} - status = acpi_walk_resources(handle, METHOD_NAME__CRS, - decode_acpi_resource, bridge); +/** + * 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)) { - err("failed to decode bridge resources\n"); - kfree(bridge); - return; - } - - acpiphp_resource_sort_and_combine(&bridge->io_head); - acpiphp_resource_sort_and_combine(&bridge->mem_head); - acpiphp_resource_sort_and_combine(&bridge->p_mem_head); - acpiphp_resource_sort_and_combine(&bridge->bus_head); - - dbg("ACPI _CRS resource:\n"); - acpiphp_dump_resource(bridge); - - if (bridge->bus_head) { - bridge->bus = bridge->bus_head->base; - bridge->sub = bridge->bus_head->base + bridge->bus_head->length - 1; + 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; - init_bridge_misc(bridge); -} - + device = (adr >> 16) & 0xffff; + function = adr & 0xffff; -/* allocate and initialize PCI-to-PCI bridge data structure */ -static void add_p2p_bridge(acpi_handle *handle, int seg, int bus, int dev, int fn) -{ - struct acpiphp_bridge *bridge; - u8 tmp8; - u16 tmp16; - u64 base64, limit64; - u32 base, limit, base32u, limit32u; - - bridge = kmalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); - if (bridge == NULL) { - err("out of memory\n"); - return; + 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(); - memset(bridge, 0, sizeof(struct acpiphp_bridge)); + /* + * 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; - bridge->type = BRIDGE_TYPE_P2P; - bridge->handle = handle; - bridge->seg = seg; + if (acpi_has_method(handle, "_STA")) + newfunc->flags |= FUNC_HAS_STA; - bridge->pci_dev = pci_find_slot(bus, PCI_DEVFN(dev, fn)); - if (!bridge->pci_dev) { - err("Can't get pci_dev\n"); - kfree(bridge); - return; - } + /* search for objects that share the same slot */ + list_for_each_entry(slot, &bridge->slots, node) + if (slot->device == device) + goto slot_found; - bridge->pci_bus = bridge->pci_dev->subordinate; - if (!bridge->pci_bus) { - err("This is not a PCI-to-PCI bridge!\n"); - kfree(bridge); - return; + 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; } - spin_lock_init(&bridge->res_lock); + slot->bus = bridge->pci_bus; + slot->device = device; + INIT_LIST_HEAD(&slot->funcs); - bridge->bus = bridge->pci_bus->number; - bridge->sub = bridge->pci_bus->subordinate; + list_add_tail(&slot->node, &bridge->slots); /* - * decode resources under this P2P bridge + * 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), becuase 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 && device_is_managed_by_native_pciehp(pdev))) { + unsigned long long sun; + int retval; - /* I/O resources */ - pci_read_config_byte(bridge->pci_dev, PCI_IO_BASE, &tmp8); - base = tmp8; - pci_read_config_byte(bridge->pci_dev, PCI_IO_LIMIT, &tmp8); - limit = tmp8; - - switch (base & PCI_IO_RANGE_TYPE_MASK) { - case PCI_IO_RANGE_TYPE_16: - base = (base << 8) & 0xf000; - limit = ((limit << 8) & 0xf000) + 0xfff; - bridge->io_head = acpiphp_make_resource((u64)base, limit - base + 1); - if (!bridge->io_head) { - err("out of memory\n"); - kfree(bridge); - return; - } - dbg("16bit I/O range: %04x-%04x\n", - (u32)bridge->io_head->base, - (u32)(bridge->io_head->base + bridge->io_head->length - 1)); - break; - case PCI_IO_RANGE_TYPE_32: - pci_read_config_word(bridge->pci_dev, PCI_IO_BASE_UPPER16, &tmp16); - base = ((u32)tmp16 << 16) | ((base << 8) & 0xf000); - pci_read_config_word(bridge->pci_dev, PCI_IO_LIMIT_UPPER16, &tmp16); - limit = (((u32)tmp16 << 16) | ((limit << 8) & 0xf000)) + 0xfff; - bridge->io_head = acpiphp_make_resource((u64)base, limit - base + 1); - if (!bridge->io_head) { - err("out of memory\n"); - kfree(bridge); - return; + 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); } - dbg("32bit I/O range: %08x-%08x\n", - (u32)bridge->io_head->base, - (u32)(bridge->io_head->base + bridge->io_head->length - 1)); - break; - case 0x0f: - dbg("I/O space unsupported\n"); - break; - default: - warn("Unknown I/O range type\n"); + /* Even if the slot registration fails, we can still use it. */ } - /* Memory resources (mandatory for P2P bridge) */ - pci_read_config_word(bridge->pci_dev, PCI_MEMORY_BASE, &tmp16); - base = (tmp16 & 0xfff0) << 16; - pci_read_config_word(bridge->pci_dev, PCI_MEMORY_LIMIT, &tmp16); - limit = ((tmp16 & 0xfff0) << 16) | 0xfffff; - bridge->mem_head = acpiphp_make_resource((u64)base, limit - base + 1); - if (!bridge->mem_head) { - err("out of memory\n"); - kfree(bridge); - return; - } - dbg("32bit Memory range: %08x-%08x\n", - (u32)bridge->mem_head->base, - (u32)(bridge->mem_head->base + bridge->mem_head->length-1)); - - /* Prefetchable Memory resources (optional) */ - pci_read_config_word(bridge->pci_dev, PCI_PREF_MEMORY_BASE, &tmp16); - base = tmp16; - pci_read_config_word(bridge->pci_dev, PCI_PREF_MEMORY_LIMIT, &tmp16); - limit = tmp16; - - switch (base & PCI_MEMORY_RANGE_TYPE_MASK) { - case PCI_PREF_RANGE_TYPE_32: - base = (base & 0xfff0) << 16; - limit = ((limit & 0xfff0) << 16) | 0xfffff; - bridge->p_mem_head = acpiphp_make_resource((u64)base, limit - base + 1); - if (!bridge->p_mem_head) { - err("out of memory\n"); - kfree(bridge); - return; - } - dbg("32bit Prefetchable memory range: %08x-%08x\n", - (u32)bridge->p_mem_head->base, - (u32)(bridge->p_mem_head->base + bridge->p_mem_head->length - 1)); - break; - case PCI_PREF_RANGE_TYPE_64: - pci_read_config_dword(bridge->pci_dev, PCI_PREF_BASE_UPPER32, &base32u); - pci_read_config_dword(bridge->pci_dev, PCI_PREF_LIMIT_UPPER32, &limit32u); - base64 = ((u64)base32u << 32) | ((base & 0xfff0) << 16); - limit64 = (((u64)limit32u << 32) | ((limit & 0xfff0) << 16)) + 0xfffff; - - bridge->p_mem_head = acpiphp_make_resource(base64, limit64 - base64 + 1); - if (!bridge->p_mem_head) { - err("out of memory\n"); - kfree(bridge); - return; - } - dbg("64bit Prefetchable memory range: %08x%08x-%08x%08x\n", - (u32)(bridge->p_mem_head->base >> 32), - (u32)(bridge->p_mem_head->base & 0xffffffff), - (u32)((bridge->p_mem_head->base + bridge->p_mem_head->length - 1) >> 32), - (u32)((bridge->p_mem_head->base + bridge->p_mem_head->length - 1) & 0xffffffff)); - break; - case 0x0f: - break; - default: - warn("Unknown prefetchale memory type\n"); - } + slot_found: + newfunc->slot = slot; + list_add_tail(&newfunc->sibling, &slot->funcs); - init_bridge_misc(bridge); -} + if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function), + &val, 60*1000)) + slot->flags |= SLOT_ENABLED; + return AE_OK; +} -/* callback routine to find P2P bridges */ -static acpi_status -find_p2p_bridge(acpi_handle handle, u32 lvl, void *context, void **rv) +static struct acpiphp_bridge *acpiphp_dev_to_bridge(struct acpi_device *adev) { - acpi_status status; - acpi_handle dummy_handle; - unsigned long *segbus = context; - unsigned long tmp; - int seg, bus, device, function; - struct pci_dev *dev; + struct acpiphp_bridge *bridge = NULL; - /* get PCI address */ - seg = (*segbus >> 8) & 0xff; - bus = *segbus & 0xff; - - status = acpi_get_handle(handle, "_ADR", &dummy_handle); - if (ACPI_FAILURE(status)) - return AE_OK; /* continue */ - - status = acpi_evaluate_integer(handle, "_ADR", NULL, &tmp); - if (ACPI_FAILURE(status)) { - dbg("%s: _ADR evaluation failure\n", __FUNCTION__); - return AE_OK; - } - - device = (tmp >> 16) & 0xffff; - function = tmp & 0xffff; - - dev = pci_find_slot(bus, PCI_DEVFN(device, function)); - - if (!dev) - return AE_OK; - - if (!dev->subordinate) - return AE_OK; - - /* check if this bridge has ejectable slots */ - if (detect_ejectable_slots(handle) > 0) { - dbg("found PCI-to-PCI bridge at PCI %s\n", pci_name(dev)); - add_p2p_bridge(handle, seg, bus, device, function); + acpi_lock_hp_context(); + if (adev->hp) { + bridge = to_acpiphp_root_context(adev->hp)->root_bridge; + if (bridge) + get_bridge(bridge); } - - return AE_OK; + acpi_unlock_hp_context(); + return bridge; } - -/* find hot-pluggable slots, and then find P2P bridge */ -static int add_bridge(acpi_handle handle) +static void cleanup_bridge(struct acpiphp_bridge *bridge) { - acpi_status status; - unsigned long tmp; - int seg, bus; - acpi_handle dummy_handle; - - /* if the bridge doesn't have _STA, we assume it is always there */ - status = acpi_get_handle(handle, "_STA", &dummy_handle); - if (ACPI_SUCCESS(status)) { - status = acpi_evaluate_integer(handle, "_STA", NULL, &tmp); - if (ACPI_FAILURE(status)) { - dbg("%s: _STA evaluation failure\n", __FUNCTION__); - return 0; - } - if ((tmp & ACPI_STA_FUNCTIONING) == 0) - /* don't register this object */ - return 0; - } - - /* get PCI segment number */ - status = acpi_evaluate_integer(handle, "_SEG", NULL, &tmp); - - seg = ACPI_SUCCESS(status) ? tmp : 0; - - /* get PCI bus number */ - status = acpi_evaluate_integer(handle, "_BBN", NULL, &tmp); + struct acpiphp_slot *slot; + struct acpiphp_func *func; - if (ACPI_SUCCESS(status)) { - bus = tmp; - } else { - warn("can't get bus number, assuming 0\n"); - bus = 0; - } + 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); - /* check if this bridge has ejectable slots */ - if (detect_ejectable_slots(handle) > 0) { - dbg("found PCI host-bus bridge with hot-pluggable slots\n"); - add_host_bridge(handle, seg, bus); - return 0; + 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); } - tmp = seg << 8 | bus; - - /* search P2P bridges under this host bridge */ - status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, (u32)1, - find_p2p_bridge, &tmp, NULL); + mutex_lock(&bridge_mutex); + list_del(&bridge->list); + mutex_unlock(&bridge_mutex); - if (ACPI_FAILURE(status)) - warn("find_p2p_bridge faied (error code = 0x%x)\n",status); - - return 0; + acpi_lock_hp_context(); + bridge->is_going_away = true; + acpi_unlock_hp_context(); } - -static void remove_bridge(acpi_handle handle) +/** + * 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) { - /* No-op for now .. */ -} + 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; -static int power_on_slot(struct acpiphp_slot *slot) -{ - acpi_status status; - struct acpiphp_func *func; - struct list_head *l; - int retval = 0; - - /* if already enabled, just skip */ - if (slot->flags & SLOT_POWEREDON) - goto err_exit; - - list_for_each (l, &slot->funcs) { - func = list_entry(l, struct acpiphp_func, sibling); - - if (func->flags & FUNC_HAS_PS0) { - dbg("%s: executing _PS0\n", __FUNCTION__); - status = acpi_evaluate_object(func->handle, "_PS0", NULL, NULL); - if (ACPI_FAILURE(status)) { - warn("%s: _PS0 failed\n", __FUNCTION__); - retval = -1; - goto err_exit; - } else - break; - } + list_for_each_entry(tmp, &bus->children, node) { + n = pci_bus_max_busnr(tmp); + if (n > max) + max = n; } - - /* TBD: evaluate _STA to check if the slot is enabled */ - - slot->flags |= SLOT_POWEREDON; - - err_exit: - return retval; + return max; } - -static int power_off_slot(struct acpiphp_slot *slot) +static void acpiphp_set_acpi_region(struct acpiphp_slot *slot) { - acpi_status status; struct acpiphp_func *func; - struct list_head *l; + union acpi_object params[2]; struct acpi_object_list arg_list; - union acpi_object arg; - int retval = 0; - - /* if already disabled, just skip */ - if ((slot->flags & SLOT_POWEREDON) == 0) - goto err_exit; + 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); + } +} - list_for_each (l, &slot->funcs) { - func = list_entry(l, struct acpiphp_func, sibling); +static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev) +{ + struct acpiphp_func *func; - if (func->pci_dev && (func->flags & FUNC_HAS_PS3)) { - status = acpi_evaluate_object(func->handle, "_PS3", NULL, NULL); - if (ACPI_FAILURE(status)) { - warn("%s: _PS3 failed\n", __FUNCTION__); - retval = -1; - goto err_exit; - } else - break; - } - } + /* quirk, or pcie could set it already */ + if (dev->is_hotplug_bridge) + return; - list_for_each (l, &slot->funcs) { - func = list_entry(l, struct acpiphp_func, sibling); - - /* We don't want to call _EJ0 on non-existing functions. */ - if (func->pci_dev && (func->flags & FUNC_HAS_EJ0)) { - /* _EJ0 method take one argument */ - arg_list.count = 1; - arg_list.pointer = &arg; - arg.type = ACPI_TYPE_INTEGER; - arg.integer.value = 1; - - status = acpi_evaluate_object(func->handle, "_EJ0", &arg_list, NULL); - if (ACPI_FAILURE(status)) { - warn("%s: _EJ0 failed\n", __FUNCTION__); - retval = -1; - goto err_exit; - } else - break; + list_for_each_entry(func, &slot->funcs, sibling) { + if (PCI_FUNC(dev->devfn) == func->function) { + dev->is_hotplug_bridge = 1; + break; } } +} - /* TBD: evaluate _STA to check if the slot is disabled */ +static int acpiphp_rescan_slot(struct acpiphp_slot *slot) +{ + struct acpiphp_func *func; - slot->flags &= (~SLOT_POWEREDON); + list_for_each_entry(func, &slot->funcs, sibling) { + struct acpi_device *adev = func_to_acpi_device(func); - err_exit: - return retval; + 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)); } - /** - * enable_device - enable, configure a slot + * enable_slot - enable, configure a slot * @slot: slot to be enabled * * This function should be called per *physical slot*, * not per each slot object in ACPI namespace. - * */ -static int enable_device(struct acpiphp_slot *slot) +static void enable_slot(struct acpiphp_slot *slot) { - u8 bus; struct pci_dev *dev; - struct pci_bus *child; - struct list_head *l; + struct pci_bus *bus = slot->bus; struct acpiphp_func *func; - int retval = 0; - int num; - - if (slot->flags & SLOT_ENABLED) - goto err_exit; - - /* sanity check: dev should be NULL when hot-plugged in */ - dev = pci_find_slot(slot->bridge->bus, PCI_DEVFN(slot->device, 0)); - if (dev) { - /* This case shouldn't happen */ - err("pci_dev structure already exists.\n"); - retval = -1; - goto err_exit; - } + int max, pass; + LIST_HEAD(add_list); + + acpiphp_rescan_slot(slot); + max = acpiphp_max_busnr(bus); + for (pass = 0; pass < 2; pass++) { + list_for_each_entry(dev, &bus->devices, bus_list) { + if (PCI_SLOT(dev->devfn) != slot->device) + continue; - /* allocate resources to device */ - retval = acpiphp_configure_slot(slot); - if (retval) - goto err_exit; - - /* returned `dev' is the *first function* only! */ - num = pci_scan_slot(slot->bridge->pci_bus, PCI_DEVFN(slot->device, 0)); - if (num) - pci_bus_add_devices(slot->bridge->pci_bus); - dev = pci_find_slot(slot->bridge->bus, PCI_DEVFN(slot->device, 0)); - - if (!dev) { - err("No new device found\n"); - retval = -1; - goto err_exit; + if (pci_is_bridge(dev)) { + 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); - if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) { - pci_read_config_byte(dev, PCI_SECONDARY_BUS, &bus); - child = (struct pci_bus*) pci_add_new_bus(dev->bus, dev, bus); - pci_do_scan_bus(child); + acpiphp_sanitize_bus(bus); + acpiphp_set_hpp_values(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 (!dev->is_added) + dev->current_state = PCI_D0; } - /* associate pci_dev to our representation */ - list_for_each (l, &slot->funcs) { - func = list_entry(l, struct acpiphp_func, sibling); + pci_bus_add_devices(bus); - func->pci_dev = pci_find_slot(slot->bridge->bus, - PCI_DEVFN(slot->device, - func->function)); - if (!func->pci_dev) + 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; - - /* configure device */ - retval = acpiphp_configure_function(func); - if (retval) - goto err_exit; + } } - - slot->flags |= SLOT_ENABLED; - - dbg("Available resources:\n"); - acpiphp_dump_resource(slot->bridge); - - err_exit: - return retval; } - /** - * disable_device - disable a slot + * disable_slot - disable a slot + * @slot: ACPI PHP slot */ -static int disable_device(struct acpiphp_slot *slot) +static void disable_slot(struct acpiphp_slot *slot) { - int retval = 0; + struct pci_bus *bus = slot->bus; + struct pci_dev *dev, *prev; struct acpiphp_func *func; - struct list_head *l; - - /* is this slot already disabled? */ - if (!(slot->flags & SLOT_ENABLED)) - goto err_exit; - list_for_each (l, &slot->funcs) { - func = list_entry(l, struct acpiphp_func, sibling); + /* + * 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); - if (func->pci_dev) - acpiphp_unconfigure_function(func); - } + list_for_each_entry(func, &slot->funcs, sibling) + acpi_bus_trim(func_to_acpi_device(func)); slot->flags &= (~SLOT_ENABLED); +} - err_exit: - return retval; +static bool acpiphp_no_hotplug(struct acpi_device *adev) +{ + return adev && adev->flags.no_hotplug; } +static bool slot_no_hotplug(struct acpiphp_slot *slot) +{ + struct acpiphp_func *func; + + list_for_each_entry(func, &slot->funcs, sibling) + if (acpiphp_no_hotplug(func_to_acpi_device(func))) + 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 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 + * 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 + * Otherwise return 0. */ static unsigned int get_slot_status(struct acpiphp_slot *slot) { - acpi_status status; - unsigned long sta = 0; - u32 dvid; - struct list_head *l; + unsigned long long sta = 0; struct acpiphp_func *func; - list_for_each (l, &slot->funcs) { - func = list_entry(l, struct acpiphp_func, sibling); - + list_for_each_entry(func, &slot->funcs, sibling) { if (func->flags & FUNC_HAS_STA) { - status = acpi_evaluate_integer(func->handle, "_STA", NULL, &sta); + acpi_status status; + + status = acpi_evaluate_integer(func_to_handle(func), + "_STA", NULL, &sta); if (ACPI_SUCCESS(status) && sta) break; } else { - pci_bus_read_config_dword(slot->bridge->pci_bus, + u32 dvid; + + pci_bus_read_config_dword(slot->bus, PCI_DEVFN(slot->device, func->function), PCI_VENDOR_ID, &dvid); @@ -919,373 +631,402 @@ static unsigned int get_slot_status(struct acpiphp_slot *slot) 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 = false; + + if (adev) { + acpi_status status; + unsigned long long sta; + + status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); + alive = (ACPI_SUCCESS(status) && device_status_valid(sta)) + || acpiphp_no_hotplug(adev); + } + if (!alive) + alive = pci_device_is_present(dev); + + if (!alive) { + 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 int acpiphp_check_bridge(struct acpiphp_bridge *bridge) +static void acpiphp_check_bridge(struct acpiphp_bridge *bridge) { struct acpiphp_slot *slot; - int retval = 0; - int enabled, disabled; - enabled = disabled = 0; + /* Bail out if the bridge is going away. */ + if (bridge->is_going_away) + return; - for (slot = bridge->slots; slot; slot = slot->next) { - unsigned int status = get_slot_status(slot); - if (slot->flags & SLOT_ENABLED) { - if (status == ACPI_STA_ALL) - continue; - retval = acpiphp_disable_slot(slot); - if (retval) { - err("Error occurred in disabling\n"); - goto err_exit; - } - disabled++; + 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); } else { - if (status != ACPI_STA_ALL) - continue; - retval = acpiphp_enable_slot(slot); - if (retval) { - err("Error occurred in enabling\n"); - goto err_exit; - } - enabled++; + disable_slot(slot); } } +} - dbg("%s: %d enabled, %d disabled\n", __FUNCTION__, enabled, disabled); +static void acpiphp_set_hpp_values(struct pci_bus *bus) +{ + struct pci_dev *dev; - err_exit: - return retval; + list_for_each_entry(dev, &bus->devices, bus_list) + pci_configure_slot(dev); } /* - * ACPI event handlers + * 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; + } + } + } +} -/** - * handle_hotplug_event_bridge - handle ACPI event on bridges - * - * @handle: Notify()'ed acpi_handle - * @type: Notify code - * @context: pointer to acpiphp_bridge structure - * - * handles ACPI event notification on {host,p2p} bridges - * +/* + * ACPI event handlers */ -static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) + +void acpiphp_check_host_bridge(struct acpi_device *adev) { struct acpiphp_bridge *bridge; - char objname[64]; - struct acpi_buffer buffer = { .length = sizeof(objname), - .pointer = objname }; - - bridge = (struct acpiphp_bridge *)context; - acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); + bridge = acpiphp_dev_to_bridge(adev); + if (bridge) { + pci_lock_rescan_remove(); - switch (type) { - case ACPI_NOTIFY_BUS_CHECK: - /* bus re-enumerate */ - dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); acpiphp_check_bridge(bridge); - break; - - case ACPI_NOTIFY_DEVICE_CHECK: - /* device check */ - dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); - acpiphp_check_bridge(bridge); - break; - case ACPI_NOTIFY_DEVICE_WAKE: - /* wake event */ - dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); - break; - - case ACPI_NOTIFY_EJECT_REQUEST: - /* request device eject */ - dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); - break; - - case ACPI_NOTIFY_FREQUENCY_MISMATCH: - printk(KERN_ERR "Device %s cannot be configured due" - " to a frequency mismatch\n", objname); - break; - - case ACPI_NOTIFY_BUS_MODE_MISMATCH: - printk(KERN_ERR "Device %s cannot be configured due" - " to a bus mode mismatch\n", objname); - break; - - case ACPI_NOTIFY_POWER_FAULT: - printk(KERN_ERR "Device %s has suffered a power fault\n", - objname); - break; - - default: - warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); - break; + pci_unlock_rescan_remove(); + put_bridge(bridge); } } +static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot); -/** - * handle_hotplug_event_func - handle ACPI event on functions (i.e. slots) - * - * @handle: Notify()'ed acpi_handle - * @type: Notify code - * @context: pointer to acpiphp_func structure - * - * handles ACPI event notification on slots - * - */ -static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context) +static void hotplug_event(u32 type, struct acpiphp_context *context) { - struct acpiphp_func *func; - char objname[64]; - struct acpi_buffer buffer = { .length = sizeof(objname), - .pointer = objname }; + 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_get_name(handle, ACPI_FULL_PATHNAME, &buffer); + acpi_unlock_hp_context(); - func = (struct acpiphp_func *)context; + pci_lock_rescan_remove(); switch (type) { case ACPI_NOTIFY_BUS_CHECK: /* bus re-enumerate */ - dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname); - acpiphp_enable_slot(func->slot); - break; + 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); - case ACPI_NOTIFY_DEVICE_CHECK: - /* device check : re-enumerate from parent bus */ - dbg("%s: Device check notify on %s\n", __FUNCTION__, objname); - acpiphp_check_bridge(func->slot->bridge); break; - case ACPI_NOTIFY_DEVICE_WAKE: - /* wake event */ - dbg("%s: Device wake notify on %s\n", __FUNCTION__, objname); + 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 */ - dbg("%s: Device eject notify on %s\n", __FUNCTION__, objname); - acpiphp_disable_slot(func->slot); - break; - - default: - warn("notify_handler: unknown event type 0x%x for %s\n", type, objname); + acpi_handle_debug(handle, "Eject request in %s()\n", __func__); + acpiphp_disable_and_eject_slot(slot); break; } -} - -static struct acpi_pci_driver acpi_pci_hp_driver = { - .add = add_bridge, - .remove = remove_bridge, -}; + pci_unlock_rescan_remove(); + if (bridge) + put_bridge(bridge); +} -/** - * acpiphp_glue_init - initializes all PCI hotplug - ACPI glue data structures - * - */ -int __init acpiphp_glue_init(void) +static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type) { - int num; - - if (list_empty(&pci_root_buses)) - return -1; + struct acpiphp_context *context; - num = acpi_pci_register_driver(&acpi_pci_hp_driver); - - if (num <= 0) - return -1; + context = acpiphp_grab_context(adev); + if (!context) + return -ENODATA; + hotplug_event(type, context); + acpiphp_let_context_go(context); return 0; } - /** - * acpiphp_glue_exit - terminates all PCI hotplug - ACPI glue data structures + * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus. + * @bus: PCI bus to enumerate the slots for. * - * This function frees all data allocated in acpiphp_glue_init() + * 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 __exit acpiphp_glue_exit(void) +void acpiphp_enumerate_slots(struct pci_bus *bus) { - struct list_head *l1, *l2, *n1, *n2; struct acpiphp_bridge *bridge; - struct acpiphp_slot *slot, *next; - struct acpiphp_func *func; + struct acpi_device *adev; + acpi_handle handle; acpi_status status; - list_for_each_safe (l1, n1, &bridge_list) { - bridge = (struct acpiphp_bridge *)l1; - slot = bridge->slots; - while (slot) { - next = slot->next; - list_for_each_safe (l2, n2, &slot->funcs) { - func = list_entry(l2, struct acpiphp_func, sibling); - acpiphp_free_resource(&func->io_head); - acpiphp_free_resource(&func->mem_head); - acpiphp_free_resource(&func->p_mem_head); - acpiphp_free_resource(&func->bus_head); - status = acpi_remove_notify_handler(func->handle, - ACPI_SYSTEM_NOTIFY, - handle_hotplug_event_func); - if (ACPI_FAILURE(status)) - err("failed to remove notify handler\n"); - kfree(func); - } - kfree(slot); - slot = next; - } - status = acpi_remove_notify_handler(bridge->handle, ACPI_SYSTEM_NOTIFY, - handle_hotplug_event_bridge); - if (ACPI_FAILURE(status)) - err("failed to remove notify handler\n"); + if (acpiphp_disabled) + return; - acpiphp_free_resource(&bridge->io_head); - acpiphp_free_resource(&bridge->mem_head); - acpiphp_free_resource(&bridge->p_mem_head); - acpiphp_free_resource(&bridge->bus_head); + adev = ACPI_COMPANION(bus->bridge); + if (!adev) + return; - kfree(bridge); + handle = adev->handle; + bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL); + if (!bridge) { + acpi_handle_err(handle, "No memory for bridge object\n"); + return; } - acpi_pci_unregister_driver(&acpi_pci_hp_driver); -} + 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); -/** - * acpiphp_get_num_slots - count number of slots in a system - */ -int __init acpiphp_get_num_slots(void) -{ - struct list_head *node; - struct acpiphp_bridge *bridge; - int num_slots; + acpi_lock_hp_context(); + if (pci_is_root_bus(bridge->pci_bus)) { + struct acpiphp_root_context *root_context; - num_slots = 0; + root_context = kzalloc(sizeof(*root_context), GFP_KERNEL); + if (!root_context) + goto err; - list_for_each (node, &bridge_list) { - bridge = (struct acpiphp_bridge *)node; - dbg("Bus%d %dslot(s)\n", bridge->bus, bridge->nr_slots); - num_slots += bridge->nr_slots; + root_context->root_bridge = bridge; + acpi_set_hp_context(adev, &root_context->hp, NULL, NULL, NULL); + } 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(); - dbg("Total %dslots\n", num_slots); - return num_slots; -} + /* 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; -#if 0 -/** - * acpiphp_for_each_slot - call function for each slot - * @fn: callback function - * @data: context to be passed to callback function - * - */ -static int acpiphp_for_each_slot(acpiphp_callback fn, void *data) + err: + acpi_unlock_hp_context(); + put_device(&bus->dev); + pci_dev_put(bridge->pci_dev); + kfree(bridge); +} + +void acpiphp_drop_bridge(struct acpiphp_bridge *bridge) { - struct list_head *node; - struct acpiphp_bridge *bridge; - struct acpiphp_slot *slot; - int retval = 0; - - list_for_each (node, &bridge_list) { - bridge = (struct acpiphp_bridge *)node; - for (slot = bridge->slots; slot; slot = slot->next) { - retval = fn(slot, data); - if (!retval) - goto err_exit; - } + 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); } - - err_exit: - return retval; + cleanup_bridge(bridge); + put_bridge(bridge); } -#endif -/* search matching slot from id */ -struct acpiphp_slot *get_slot_from_id(int id) +/** + * 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 list_head *node; struct acpiphp_bridge *bridge; - struct acpiphp_slot *slot; - list_for_each (node, &bridge_list) { - bridge = (struct acpiphp_bridge *)node; - for (slot = bridge->slots; slot; slot = slot->next) - if (slot->id == id) - return slot; - } + if (acpiphp_disabled) + return; - /* should never happen! */ - err("%s: no object for id %d\n", __FUNCTION__, id); - WARN_ON(1); - return NULL; -} + 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) { - int retval; - - down(&slot->crit_sect); + pci_lock_rescan_remove(); - /* wake up all functions */ - retval = power_on_slot(slot); - if (retval) - goto err_exit; + if (slot->flags & SLOT_IS_GOING_AWAY) + return -ENODEV; - if (get_slot_status(slot) == ACPI_STA_ALL) - /* configure all functions */ - retval = enable_device(slot); + /* configure all functions */ + if (!(slot->flags & SLOT_ENABLED)) + enable_slot(slot); - err_exit: - up(&slot->crit_sect); - return retval; + pci_unlock_rescan_remove(); + return 0; } - /** - * acpiphp_disable_slot - power off slot + * acpiphp_disable_and_eject_slot - power off and eject slot + * @slot: ACPI PHP slot */ -int acpiphp_disable_slot(struct acpiphp_slot *slot) +static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot) { - int retval = 0; + struct acpiphp_func *func; - down(&slot->crit_sect); + if (slot->flags & SLOT_IS_GOING_AWAY) + return -ENODEV; /* unconfigure all functions */ - retval = disable_device(slot); - if (retval) - goto err_exit; - - /* power off all functions */ - retval = power_off_slot(slot); - if (retval) - goto err_exit; - - acpiphp_resource_sort_and_combine(&slot->bridge->io_head); - acpiphp_resource_sort_and_combine(&slot->bridge->mem_head); - acpiphp_resource_sort_and_combine(&slot->bridge->p_mem_head); - acpiphp_resource_sort_and_combine(&slot->bridge->bus_head); - dbg("Available resources:\n"); - acpiphp_dump_resource(slot->bridge); - - err_exit: - up(&slot->crit_sect); - return retval; + 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 @@ -1293,52 +1034,23 @@ int acpiphp_disable_slot(struct acpiphp_slot *slot) */ u8 acpiphp_get_power_status(struct acpiphp_slot *slot) { - unsigned int sta; - - sta = get_slot_status(slot); - - return (sta & ACPI_STA_ENABLED) ? 1 : 0; + return (slot->flags & SLOT_ENABLED); } - /* - * latch closed: 1 - * latch open: 0 + * latch open: 1 + * latch closed: 0 */ u8 acpiphp_get_latch_status(struct acpiphp_slot *slot) { - unsigned int sta; - - sta = get_slot_status(slot); - - return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0; + return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI); } - /* * adapter presence : 1 * absence : 0 */ u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot) { - unsigned int sta; - - sta = get_slot_status(slot); - - return (sta == 0) ? 0 : 1; -} - - -/* - * pci address (seg/bus/dev) - */ -u32 acpiphp_get_address(struct acpiphp_slot *slot) -{ - u32 address; - - address = ((slot->bridge->seg) << 16) | - ((slot->bridge->bus) << 8) | - slot->device; - - return address; + return !!get_slot_status(slot); } |