diff options
Diffstat (limited to 'drivers/acpi/pci_root.c')
| -rw-r--r-- | drivers/acpi/pci_root.c | 667 |
1 files changed, 667 insertions, 0 deletions
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c new file mode 100644 index 00000000..7aff6312 --- /dev/null +++ b/drivers/acpi/pci_root.c @@ -0,0 +1,667 @@ +/* + * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $) + * + * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> + * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at + * your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/spinlock.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <linux/pci.h> +#include <linux/pci-acpi.h> +#include <linux/pci-aspm.h> +#include <linux/acpi.h> +#include <linux/slab.h> +#include <acpi/acpi_bus.h> +#include <acpi/acpi_drivers.h> +#include <acpi/apei.h> + +#define PREFIX "ACPI: " + +#define _COMPONENT ACPI_PCI_COMPONENT +ACPI_MODULE_NAME("pci_root"); +#define ACPI_PCI_ROOT_CLASS "pci_bridge" +#define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge" +static int acpi_pci_root_add(struct acpi_device *device); +static int acpi_pci_root_remove(struct acpi_device *device, int type); +static int acpi_pci_root_start(struct acpi_device *device); + +#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \ + | OSC_ACTIVE_STATE_PWR_SUPPORT \ + | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \ + | OSC_MSI_SUPPORT) + +static const struct acpi_device_id root_device_ids[] = { + {"PNP0A03", 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, root_device_ids); + +static struct acpi_driver acpi_pci_root_driver = { + .name = "pci_root", + .class = ACPI_PCI_ROOT_CLASS, + .ids = root_device_ids, + .ops = { + .add = acpi_pci_root_add, + .remove = acpi_pci_root_remove, + .start = acpi_pci_root_start, + }, +}; + +static LIST_HEAD(acpi_pci_roots); + +static struct acpi_pci_driver *sub_driver; +static DEFINE_MUTEX(osc_lock); + +int acpi_pci_register_driver(struct acpi_pci_driver *driver) +{ + int n = 0; + struct acpi_pci_root *root; + + struct acpi_pci_driver **pptr = &sub_driver; + while (*pptr) + pptr = &(*pptr)->next; + *pptr = driver; + + if (!driver->add) + return 0; + + list_for_each_entry(root, &acpi_pci_roots, node) { + driver->add(root->device->handle); + n++; + } + + return n; +} + +EXPORT_SYMBOL(acpi_pci_register_driver); + +void acpi_pci_unregister_driver(struct acpi_pci_driver *driver) +{ + struct acpi_pci_root *root; + + struct acpi_pci_driver **pptr = &sub_driver; + while (*pptr) { + if (*pptr == driver) + break; + pptr = &(*pptr)->next; + } + BUG_ON(!*pptr); + *pptr = (*pptr)->next; + + if (!driver->remove) + return; + + list_for_each_entry(root, &acpi_pci_roots, node) + driver->remove(root->device->handle); +} + +EXPORT_SYMBOL(acpi_pci_unregister_driver); + +acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus) +{ + struct acpi_pci_root *root; + + list_for_each_entry(root, &acpi_pci_roots, node) + if ((root->segment == (u16) seg) && + (root->secondary.start == (u16) bus)) + return root->device->handle; + return NULL; +} + +EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle); + +/** + * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge + * @handle - the ACPI CA node in question. + * + * Note: we could make this API take a struct acpi_device * instead, but + * for now, it's more convenient to operate on an acpi_handle. + */ +int acpi_is_root_bridge(acpi_handle handle) +{ + int ret; + struct acpi_device *device; + + ret = acpi_bus_get_device(handle, &device); + if (ret) + return 0; + + ret = acpi_match_device_ids(device, root_device_ids); + if (ret) + return 0; + else + return 1; +} +EXPORT_SYMBOL_GPL(acpi_is_root_bridge); + +static acpi_status +get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data) +{ + struct resource *res = data; + struct acpi_resource_address64 address; + + if (resource->type != ACPI_RESOURCE_TYPE_ADDRESS16 && + resource->type != ACPI_RESOURCE_TYPE_ADDRESS32 && + resource->type != ACPI_RESOURCE_TYPE_ADDRESS64) + return AE_OK; + + acpi_resource_to_address64(resource, &address); + if ((address.address_length > 0) && + (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { + res->start = address.minimum; + res->end = address.minimum + address.address_length - 1; + } + + return AE_OK; +} + +static acpi_status try_get_root_bridge_busnr(acpi_handle handle, + struct resource *res) +{ + acpi_status status; + + res->start = -1; + status = + acpi_walk_resources(handle, METHOD_NAME__CRS, + get_root_bridge_busnr_callback, res); + if (ACPI_FAILURE(status)) + return status; + if (res->start == -1) + return AE_ERROR; + return AE_OK; +} + +static void acpi_pci_bridge_scan(struct acpi_device *device) +{ + int status; + struct acpi_device *child = NULL; + + if (device->flags.bus_address) + if (device->parent && device->parent->ops.bind) { + status = device->parent->ops.bind(device); + if (!status) { + list_for_each_entry(child, &device->children, node) + acpi_pci_bridge_scan(child); + } + } +} + +static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; + +static acpi_status acpi_pci_run_osc(acpi_handle handle, + const u32 *capbuf, u32 *retval) +{ + struct acpi_osc_context context = { + .uuid_str = pci_osc_uuid_str, + .rev = 1, + .cap.length = 12, + .cap.pointer = (void *)capbuf, + }; + acpi_status status; + + status = acpi_run_osc(handle, &context); + if (ACPI_SUCCESS(status)) { + *retval = *((u32 *)(context.ret.pointer + 8)); + kfree(context.ret.pointer); + } + return status; +} + +static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, + u32 support, + u32 *control) +{ + acpi_status status; + u32 result, capbuf[3]; + + support &= OSC_PCI_SUPPORT_MASKS; + support |= root->osc_support_set; + + capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; + capbuf[OSC_SUPPORT_TYPE] = support; + if (control) { + *control &= OSC_PCI_CONTROL_MASKS; + capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; + } else { + /* Run _OSC query for all possible controls. */ + capbuf[OSC_CONTROL_TYPE] = OSC_PCI_CONTROL_MASKS; + } + + status = acpi_pci_run_osc(root->device->handle, capbuf, &result); + if (ACPI_SUCCESS(status)) { + root->osc_support_set = support; + if (control) + *control = result; + } + return status; +} + +static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) +{ + acpi_status status; + acpi_handle tmp; + + status = acpi_get_handle(root->device->handle, "_OSC", &tmp); + if (ACPI_FAILURE(status)) + return status; + mutex_lock(&osc_lock); + status = acpi_pci_query_osc(root, flags, NULL); + mutex_unlock(&osc_lock); + return status; +} + +struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle) +{ + struct acpi_pci_root *root; + + list_for_each_entry(root, &acpi_pci_roots, node) { + if (root->device->handle == handle) + return root; + } + return NULL; +} +EXPORT_SYMBOL_GPL(acpi_pci_find_root); + +struct acpi_handle_node { + struct list_head node; + acpi_handle handle; +}; + +/** + * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev + * @handle: the handle in question + * + * Given an ACPI CA handle, the desired PCI device is located in the + * list of PCI devices. + * + * If the device is found, its reference count is increased and this + * function returns a pointer to its data structure. The caller must + * decrement the reference count by calling pci_dev_put(). + * If no device is found, %NULL is returned. + */ +struct pci_dev *acpi_get_pci_dev(acpi_handle handle) +{ + int dev, fn; + unsigned long long adr; + acpi_status status; + acpi_handle phandle; + struct pci_bus *pbus; + struct pci_dev *pdev = NULL; + struct acpi_handle_node *node, *tmp; + struct acpi_pci_root *root; + LIST_HEAD(device_list); + + /* + * Walk up the ACPI CA namespace until we reach a PCI root bridge. + */ + phandle = handle; + while (!acpi_is_root_bridge(phandle)) { + node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL); + if (!node) + goto out; + + INIT_LIST_HEAD(&node->node); + node->handle = phandle; + list_add(&node->node, &device_list); + + status = acpi_get_parent(phandle, &phandle); + if (ACPI_FAILURE(status)) + goto out; + } + + root = acpi_pci_find_root(phandle); + if (!root) + goto out; + + pbus = root->bus; + + /* + * Now, walk back down the PCI device tree until we return to our + * original handle. Assumes that everything between the PCI root + * bridge and the device we're looking for must be a P2P bridge. + */ + list_for_each_entry(node, &device_list, node) { + acpi_handle hnd = node->handle; + status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr); + if (ACPI_FAILURE(status)) + goto out; + dev = (adr >> 16) & 0xffff; + fn = adr & 0xffff; + + pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn)); + if (!pdev || hnd == handle) + break; + + pbus = pdev->subordinate; + pci_dev_put(pdev); + + /* + * This function may be called for a non-PCI device that has a + * PCI parent (eg. a disk under a PCI SATA controller). In that + * case pdev->subordinate will be NULL for the parent. + */ + if (!pbus) { + dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n"); + pdev = NULL; + break; + } + } +out: + list_for_each_entry_safe(node, tmp, &device_list, node) + kfree(node); + + return pdev; +} +EXPORT_SYMBOL_GPL(acpi_get_pci_dev); + +/** + * acpi_pci_osc_control_set - Request control of PCI root _OSC features. + * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex). + * @mask: Mask of _OSC bits to request control of, place to store control mask. + * @req: Mask of _OSC bits the control of is essential to the caller. + * + * Run _OSC query for @mask and if that is successful, compare the returned + * mask of control bits with @req. If all of the @req bits are set in the + * returned mask, run _OSC request for it. + * + * The variable at the @mask address may be modified regardless of whether or + * not the function returns success. On success it will contain the mask of + * _OSC bits the BIOS has granted control of, but its contents are meaningless + * on failure. + **/ +acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) +{ + struct acpi_pci_root *root; + acpi_status status; + u32 ctrl, capbuf[3]; + acpi_handle tmp; + + if (!mask) + return AE_BAD_PARAMETER; + + ctrl = *mask & OSC_PCI_CONTROL_MASKS; + if ((ctrl & req) != req) + return AE_TYPE; + + root = acpi_pci_find_root(handle); + if (!root) + return AE_NOT_EXIST; + + status = acpi_get_handle(handle, "_OSC", &tmp); + if (ACPI_FAILURE(status)) + return status; + + mutex_lock(&osc_lock); + + *mask = ctrl | root->osc_control_set; + /* No need to evaluate _OSC if the control was already granted. */ + if ((root->osc_control_set & ctrl) == ctrl) + goto out; + + /* Need to check the available controls bits before requesting them. */ + while (*mask) { + status = acpi_pci_query_osc(root, root->osc_support_set, mask); + if (ACPI_FAILURE(status)) + goto out; + if (ctrl == *mask) + break; + ctrl = *mask; + } + + if ((ctrl & req) != req) { + status = AE_SUPPORT; + goto out; + } + + capbuf[OSC_QUERY_TYPE] = 0; + capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; + capbuf[OSC_CONTROL_TYPE] = ctrl; + status = acpi_pci_run_osc(handle, capbuf, mask); + if (ACPI_SUCCESS(status)) + root->osc_control_set = *mask; +out: + mutex_unlock(&osc_lock); + return status; +} +EXPORT_SYMBOL(acpi_pci_osc_control_set); + +static int __devinit acpi_pci_root_add(struct acpi_device *device) +{ + unsigned long long segment, bus; + acpi_status status; + int result; + struct acpi_pci_root *root; + acpi_handle handle; + struct acpi_device *child; + u32 flags, base_flags; + + root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); + if (!root) + return -ENOMEM; + + segment = 0; + status = acpi_evaluate_integer(device->handle, METHOD_NAME__SEG, NULL, + &segment); + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { + printk(KERN_ERR PREFIX "can't evaluate _SEG\n"); + result = -ENODEV; + goto end; + } + + /* Check _CRS first, then _BBN. If no _BBN, default to zero. */ + root->secondary.flags = IORESOURCE_BUS; + status = try_get_root_bridge_busnr(device->handle, &root->secondary); + if (ACPI_FAILURE(status)) { + /* + * We need both the start and end of the downstream bus range + * to interpret _CBA (MMCONFIG base address), so it really is + * supposed to be in _CRS. If we don't find it there, all we + * can do is assume [_BBN-0xFF] or [0-0xFF]. + */ + root->secondary.end = 0xFF; + printk(KERN_WARNING FW_BUG PREFIX + "no secondary bus range in _CRS\n"); + status = acpi_evaluate_integer(device->handle, METHOD_NAME__BBN, + NULL, &bus); + if (ACPI_SUCCESS(status)) + root->secondary.start = bus; + else if (status == AE_NOT_FOUND) + root->secondary.start = 0; + else { + printk(KERN_ERR PREFIX "can't evaluate _BBN\n"); + result = -ENODEV; + goto end; + } + } + + INIT_LIST_HEAD(&root->node); + root->device = device; + root->segment = segment & 0xFFFF; + strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME); + strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS); + device->driver_data = root; + + /* + * All supported architectures that use ACPI have support for + * PCI domains, so we indicate this in _OSC support capabilities. + */ + flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; + acpi_pci_osc_support(root, flags); + + /* + * TBD: Need PCI interface for enumeration/configuration of roots. + */ + + /* TBD: Locking */ + list_add_tail(&root->node, &acpi_pci_roots); + + printk(KERN_INFO PREFIX "%s [%s] (domain %04x %pR)\n", + acpi_device_name(device), acpi_device_bid(device), + root->segment, &root->secondary); + + /* + * Scan the Root Bridge + * -------------------- + * Must do this prior to any attempt to bind the root device, as the + * PCI namespace does not get created until this call is made (and + * thus the root bridge's pci_dev does not exist). + */ + root->bus = pci_acpi_scan_root(root); + if (!root->bus) { + printk(KERN_ERR PREFIX + "Bus %04x:%02x not present in PCI namespace\n", + root->segment, (unsigned int)root->secondary.start); + result = -ENODEV; + goto end; + } + + /* + * Attach ACPI-PCI Context + * ----------------------- + * Thus binding the ACPI and PCI devices. + */ + result = acpi_pci_bind_root(device); + if (result) + goto end; + + /* + * PCI Routing Table + * ----------------- + * Evaluate and parse _PRT, if exists. + */ + status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle); + if (ACPI_SUCCESS(status)) + result = acpi_pci_irq_add_prt(device->handle, root->bus); + + /* + * Scan and bind all _ADR-Based Devices + */ + list_for_each_entry(child, &device->children, node) + acpi_pci_bridge_scan(child); + + /* Indicate support for various _OSC capabilities. */ + if (pci_ext_cfg_avail(root->bus->self)) + flags |= OSC_EXT_PCI_CONFIG_SUPPORT; + if (pcie_aspm_support_enabled()) + flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | + OSC_CLOCK_PWR_CAPABILITY_SUPPORT; + if (pci_msi_enabled()) + flags |= OSC_MSI_SUPPORT; + if (flags != base_flags) + acpi_pci_osc_support(root, flags); + + if (!pcie_ports_disabled + && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { + flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL + | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL + | OSC_PCI_EXPRESS_PME_CONTROL; + + if (pci_aer_available()) { + if (aer_acpi_firmware_first()) + dev_dbg(root->bus->bridge, + "PCIe errors handled by BIOS.\n"); + else + flags |= OSC_PCI_EXPRESS_AER_CONTROL; + } + + dev_info(root->bus->bridge, + "Requesting ACPI _OSC control (0x%02x)\n", flags); + + status = acpi_pci_osc_control_set(device->handle, &flags, + OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); + if (ACPI_SUCCESS(status)) { + dev_info(root->bus->bridge, + "ACPI _OSC control (0x%02x) granted\n", flags); + if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { + /* + * We have ASPM control, but the FADT indicates + * that it's unsupported. Clear it. + */ + pcie_clear_aspm(root->bus); + } + } else { + dev_info(root->bus->bridge, + "ACPI _OSC request failed (%s), " + "returned control mask: 0x%02x\n", + acpi_format_exception(status), flags); + pr_info("ACPI _OSC control for PCIe not granted, " + "disabling ASPM\n"); + pcie_no_aspm(); + } + } else { + dev_info(root->bus->bridge, + "Unable to request _OSC control " + "(_OSC support mask: 0x%02x)\n", flags); + } + + pci_acpi_add_bus_pm_notifier(device, root->bus); + if (device->wakeup.flags.run_wake) + device_set_run_wake(root->bus->bridge, true); + + return 0; + +end: + if (!list_empty(&root->node)) + list_del(&root->node); + kfree(root); + return result; +} + +static int acpi_pci_root_start(struct acpi_device *device) +{ + struct acpi_pci_root *root = acpi_driver_data(device); + + pci_bus_add_devices(root->bus); + return 0; +} + +static int acpi_pci_root_remove(struct acpi_device *device, int type) +{ + struct acpi_pci_root *root = acpi_driver_data(device); + + device_set_run_wake(root->bus->bridge, false); + pci_acpi_remove_bus_pm_notifier(device); + + kfree(root); + return 0; +} + +static int __init acpi_pci_root_init(void) +{ + acpi_hest_init(); + + if (acpi_pci_disabled) + return 0; + + pci_acpi_crs_quirks(); + if (acpi_bus_register_driver(&acpi_pci_root_driver) < 0) + return -ENODEV; + + return 0; +} + +subsys_initcall(acpi_pci_root_init); |