diff options
Diffstat (limited to 'kernel/drivers/acpi/pci_root.c')
| -rw-r--r-- | kernel/drivers/acpi/pci_root.c | 667 |
1 files changed, 667 insertions, 0 deletions
diff --git a/kernel/drivers/acpi/pci_root.c b/kernel/drivers/acpi/pci_root.c new file mode 100644 index 000000000..1b5569c09 --- /dev/null +++ b/kernel/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/mutex.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/dmar.h> +#include <linux/acpi.h> +#include <linux/slab.h> +#include <linux/dmi.h> +#include <acpi/apei.h> /* for acpi_hest_init() */ + +#include "internal.h" + +#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, + const struct acpi_device_id *not_used); +static void acpi_pci_root_remove(struct acpi_device *device); + +static int acpi_pci_root_scan_dependent(struct acpi_device *adev) +{ + acpiphp_check_host_bridge(adev); + return 0; +} + +#define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ + | OSC_PCI_ASPM_SUPPORT \ + | OSC_PCI_CLOCK_PM_SUPPORT \ + | OSC_PCI_MSI_SUPPORT) + +static const struct acpi_device_id root_device_ids[] = { + {"PNP0A03", 0}, + {"", 0}, +}; + +static struct acpi_scan_handler pci_root_handler = { + .ids = root_device_ids, + .attach = acpi_pci_root_add, + .detach = acpi_pci_root_remove, + .hotplug = { + .enabled = true, + .scan_dependent = acpi_pci_root_scan_dependent, + }, +}; + +static DEFINE_MUTEX(osc_lock); + +/** + * 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; + acpi_status status; + + status = acpi_resource_to_address64(resource, &address); + if (ACPI_FAILURE(status)) + return AE_OK; + + if ((address.address.address_length > 0) && + (address.resource_type == ACPI_BUS_NUMBER_RANGE)) { + res->start = address.address.minimum; + res->end = address.address.minimum + address.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; +} + +struct pci_osc_bit_struct { + u32 bit; + char *desc; +}; + +static struct pci_osc_bit_struct pci_osc_support_bit[] = { + { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, + { OSC_PCI_ASPM_SUPPORT, "ASPM" }, + { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, + { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, + { OSC_PCI_MSI_SUPPORT, "MSI" }, +}; + +static struct pci_osc_bit_struct pci_osc_control_bit[] = { + { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, + { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, + { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, + { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, + { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, +}; + +static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, + struct pci_osc_bit_struct *table, int size) +{ + char buf[80]; + int i, len = 0; + struct pci_osc_bit_struct *entry; + + buf[0] = '\0'; + for (i = 0, entry = table; i < size; i++, entry++) + if (word & entry->bit) + len += snprintf(buf + len, sizeof(buf) - len, "%s%s", + len ? " " : "", entry->desc); + + dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); +} + +static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) +{ + decode_osc_bits(root, msg, word, pci_osc_support_bit, + ARRAY_SIZE(pci_osc_support_bit)); +} + +static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) +{ + decode_osc_bits(root, msg, word, pci_osc_control_bit, + ARRAY_SIZE(pci_osc_control_bit)); +} + +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_DWORD] = OSC_QUERY_ENABLE; + capbuf[OSC_SUPPORT_DWORD] = support; + if (control) { + *control &= OSC_PCI_CONTROL_MASKS; + capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; + } else { + /* Run _OSC query only with existing controls. */ + capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; + } + + 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; + + 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; + struct acpi_device *device; + + if (acpi_bus_get_device(handle, &device) || + acpi_match_device_ids(device, root_device_ids)) + return NULL; + + root = acpi_driver_data(device); + + return root; +} +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 = AE_OK; + u32 ctrl, capbuf[3]; + + 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; + + 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; + decode_osc_control(root, "platform does not support", + ctrl & ~(*mask)); + ctrl = *mask; + } + + if ((ctrl & req) != req) { + decode_osc_control(root, "not requesting control; platform does not support", + req & ~(ctrl)); + status = AE_SUPPORT; + goto out; + } + + capbuf[OSC_QUERY_DWORD] = 0; + capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; + capbuf[OSC_CONTROL_DWORD] = 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 void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm) +{ + u32 support, control, requested; + acpi_status status; + struct acpi_device *device = root->device; + acpi_handle handle = device->handle; + + /* + * Apple always return failure on _OSC calls when _OSI("Darwin") has + * been called successfully. We know the feature set supported by the + * platform, so avoid calling _OSC at all + */ + + if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) { + root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; + decode_osc_control(root, "OS assumes control of", + root->osc_control_set); + return; + } + + /* + * All supported architectures that use ACPI have support for + * PCI domains, so we indicate this in _OSC support capabilities. + */ + support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; + if (pci_ext_cfg_avail()) + support |= OSC_PCI_EXT_CONFIG_SUPPORT; + if (pcie_aspm_support_enabled()) + support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; + if (pci_msi_enabled()) + support |= OSC_PCI_MSI_SUPPORT; + + decode_osc_support(root, "OS supports", support); + status = acpi_pci_osc_support(root, support); + if (ACPI_FAILURE(status)) { + dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", + acpi_format_exception(status)); + *no_aspm = 1; + return; + } + + if (pcie_ports_disabled) { + dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); + return; + } + + if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { + decode_osc_support(root, "not requesting OS control; OS requires", + ACPI_PCIE_REQ_SUPPORT); + return; + } + + control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL + | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL + | OSC_PCI_EXPRESS_PME_CONTROL; + + if (pci_aer_available()) { + if (aer_acpi_firmware_first()) + dev_info(&device->dev, + "PCIe AER handled by firmware\n"); + else + control |= OSC_PCI_EXPRESS_AER_CONTROL; + } + + requested = control; + status = acpi_pci_osc_control_set(handle, &control, + OSC_PCI_EXPRESS_CAPABILITY_CONTROL); + if (ACPI_SUCCESS(status)) { + decode_osc_control(root, "OS now controls", control); + if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { + /* + * We have ASPM control, but the FADT indicates that + * it's unsupported. Leave existing configuration + * intact and prevent the OS from touching it. + */ + dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); + *no_aspm = 1; + } + } else { + decode_osc_control(root, "OS requested", requested); + decode_osc_control(root, "platform willing to grant", control); + dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", + acpi_format_exception(status)); + + /* + * We want to disable ASPM here, but aspm_disabled + * needs to remain in its state from boot so that we + * properly handle PCIe 1.1 devices. So we set this + * flag here, to defer the action until after the ACPI + * root scan. + */ + *no_aspm = 1; + } +} + +static int acpi_pci_root_add(struct acpi_device *device, + const struct acpi_device_id *not_used) +{ + unsigned long long segment, bus; + acpi_status status; + int result; + struct acpi_pci_root *root; + acpi_handle handle = device->handle; + int no_aspm = 0; + bool hotadd = system_state != SYSTEM_BOOTING; + + root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); + if (!root) + return -ENOMEM; + + segment = 0; + status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, + &segment); + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { + dev_err(&device->dev, "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(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; + dev_warn(&device->dev, + FW_BUG "no secondary bus range in _CRS\n"); + status = acpi_evaluate_integer(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 { + dev_err(&device->dev, "can't evaluate _BBN\n"); + result = -ENODEV; + goto end; + } + } + + 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; + + if (hotadd && dmar_device_add(handle)) { + result = -ENXIO; + goto end; + } + + pr_info(PREFIX "%s [%s] (domain %04x %pR)\n", + acpi_device_name(device), acpi_device_bid(device), + root->segment, &root->secondary); + + root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); + + negotiate_os_control(root, &no_aspm); + + /* + * TBD: Need PCI interface for enumeration/configuration of roots. + */ + + /* + * 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) { + dev_err(&device->dev, + "Bus %04x:%02x not present in PCI namespace\n", + root->segment, (unsigned int)root->secondary.start); + device->driver_data = NULL; + result = -ENODEV; + goto remove_dmar; + } + + if (no_aspm) + pcie_no_aspm(); + + pci_acpi_add_bus_pm_notifier(device); + if (device->wakeup.flags.run_wake) + device_set_run_wake(root->bus->bridge, true); + + if (hotadd) { + pcibios_resource_survey_bus(root->bus); + pci_assign_unassigned_root_bus_resources(root->bus); + acpi_ioapic_add(root); + } + + pci_lock_rescan_remove(); + pci_bus_add_devices(root->bus); + pci_unlock_rescan_remove(); + return 1; + +remove_dmar: + if (hotadd) + dmar_device_remove(handle); +end: + kfree(root); + return result; +} + +static void acpi_pci_root_remove(struct acpi_device *device) +{ + struct acpi_pci_root *root = acpi_driver_data(device); + + pci_lock_rescan_remove(); + + pci_stop_root_bus(root->bus); + + WARN_ON(acpi_ioapic_remove(root)); + + device_set_run_wake(root->bus->bridge, false); + pci_acpi_remove_bus_pm_notifier(device); + + pci_remove_root_bus(root->bus); + + dmar_device_remove(device->handle); + + pci_unlock_rescan_remove(); + + kfree(root); +} + +void __init acpi_pci_root_init(void) +{ + acpi_hest_init(); + if (acpi_pci_disabled) + return; + + pci_acpi_crs_quirks(); + acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root"); +} |