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![Rafael J. Wysocki](/assets/img/avatar_default.png)
Merge PCI device power management updates for 5.16-rc1: - Make the association of ACPI device objects with PCI devices more straightforward and simplify the code doing that for all devices in general (Rafael Wysocki). - Eliminate struct pci_platform_pm_ops and handle the both of its users (PCI and Intel MID) directly in the PCI bus code (Rafael Wysocki). - Simplify and clarify ACPI PCI device PM helpers (Rafael Wysocki). - Fix ordering of operations in pci_back_from_sleep() (Rafael Wysocki). * pm-pci: PCI: PM: Fix ordering of operations in pci_back_from_sleep() PCI: PM: Do not call platform_pci_power_manageable() unnecessarily PCI: PM: Make pci_choose_state() call pci_target_state() PCI: PM: Rearrange pci_target_state() PCI: PM: Simplify acpi_pci_power_manageable() PCI: PM: Drop struct pci_platform_pm_ops PCI: ACPI: PM: Do not use pci_platform_pm_ops for ACPI PCI: PM: Do not use pci_platform_pm_ops for Intel MID PM ACPI: glue: Look for ACPI bus type only if ACPI companion is not known ACPI: glue: Drop cleanup callback from struct acpi_bus_type PCI: ACPI: Drop acpi_pci_bus
1453 lines
38 KiB
C
1453 lines
38 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCI support in ACPI
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*
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* Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
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* Copyright (C) 2004 Intel Corp.
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/irqdomain.h>
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#include <linux/pci.h>
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#include <linux/msi.h>
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#include <linux/pci_hotplug.h>
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#include <linux/module.h>
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#include <linux/pci-acpi.h>
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#include <linux/pm_runtime.h>
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#include <linux/pm_qos.h>
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#include <linux/rwsem.h>
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#include "pci.h"
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/*
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* The GUID is defined in the PCI Firmware Specification available here:
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* https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
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*/
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const guid_t pci_acpi_dsm_guid =
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GUID_INIT(0xe5c937d0, 0x3553, 0x4d7a,
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0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d);
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#if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
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static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
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{
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struct device *dev = &adev->dev;
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struct resource_entry *entry;
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struct list_head list;
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unsigned long flags;
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int ret;
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INIT_LIST_HEAD(&list);
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flags = IORESOURCE_MEM;
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ret = acpi_dev_get_resources(adev, &list,
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acpi_dev_filter_resource_type_cb,
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(void *) flags);
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if (ret < 0) {
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dev_err(dev, "failed to parse _CRS method, error code %d\n",
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ret);
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return ret;
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}
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if (ret == 0) {
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dev_err(dev, "no IO and memory resources present in _CRS\n");
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return -EINVAL;
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}
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entry = list_first_entry(&list, struct resource_entry, node);
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*res = *entry->res;
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acpi_dev_free_resource_list(&list);
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return 0;
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}
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static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
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void **retval)
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{
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u16 *segment = context;
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unsigned long long uid;
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acpi_status status;
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status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
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if (ACPI_FAILURE(status) || uid != *segment)
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return AE_CTRL_DEPTH;
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*(acpi_handle *)retval = handle;
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return AE_CTRL_TERMINATE;
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}
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int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
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struct resource *res)
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{
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struct acpi_device *adev;
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acpi_status status;
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acpi_handle handle;
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int ret;
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status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
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if (ACPI_FAILURE(status)) {
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dev_err(dev, "can't find _HID %s device to locate resources\n",
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hid);
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return -ENODEV;
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}
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ret = acpi_bus_get_device(handle, &adev);
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if (ret)
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return ret;
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ret = acpi_get_rc_addr(adev, res);
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if (ret) {
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dev_err(dev, "can't get resource from %s\n",
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dev_name(&adev->dev));
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return ret;
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}
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return 0;
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}
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#endif
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phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
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{
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acpi_status status = AE_NOT_EXIST;
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unsigned long long mcfg_addr;
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if (handle)
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status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
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NULL, &mcfg_addr);
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if (ACPI_FAILURE(status))
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return 0;
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return (phys_addr_t)mcfg_addr;
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}
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/* _HPX PCI Setting Record (Type 0); same as _HPP */
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struct hpx_type0 {
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u32 revision; /* Not present in _HPP */
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u8 cache_line_size; /* Not applicable to PCIe */
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u8 latency_timer; /* Not applicable to PCIe */
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u8 enable_serr;
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u8 enable_perr;
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};
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static struct hpx_type0 pci_default_type0 = {
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.revision = 1,
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.cache_line_size = 8,
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.latency_timer = 0x40,
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.enable_serr = 0,
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.enable_perr = 0,
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};
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static void program_hpx_type0(struct pci_dev *dev, struct hpx_type0 *hpx)
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{
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u16 pci_cmd, pci_bctl;
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if (!hpx)
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hpx = &pci_default_type0;
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if (hpx->revision > 1) {
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pci_warn(dev, "PCI settings rev %d not supported; using defaults\n",
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hpx->revision);
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hpx = &pci_default_type0;
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}
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pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpx->cache_line_size);
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pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpx->latency_timer);
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pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
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if (hpx->enable_serr)
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pci_cmd |= PCI_COMMAND_SERR;
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if (hpx->enable_perr)
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pci_cmd |= PCI_COMMAND_PARITY;
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pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
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/* Program bridge control value */
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if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
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pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
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hpx->latency_timer);
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pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
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if (hpx->enable_perr)
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pci_bctl |= PCI_BRIDGE_CTL_PARITY;
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pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
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}
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}
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static acpi_status decode_type0_hpx_record(union acpi_object *record,
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struct hpx_type0 *hpx0)
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{
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int i;
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union acpi_object *fields = record->package.elements;
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u32 revision = fields[1].integer.value;
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switch (revision) {
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case 1:
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if (record->package.count != 6)
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return AE_ERROR;
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for (i = 2; i < 6; i++)
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if (fields[i].type != ACPI_TYPE_INTEGER)
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return AE_ERROR;
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hpx0->revision = revision;
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hpx0->cache_line_size = fields[2].integer.value;
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hpx0->latency_timer = fields[3].integer.value;
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hpx0->enable_serr = fields[4].integer.value;
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hpx0->enable_perr = fields[5].integer.value;
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break;
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default:
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pr_warn("%s: Type 0 Revision %d record not supported\n",
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__func__, revision);
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return AE_ERROR;
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}
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return AE_OK;
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}
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/* _HPX PCI-X Setting Record (Type 1) */
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struct hpx_type1 {
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u32 revision;
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u8 max_mem_read;
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u8 avg_max_split;
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u16 tot_max_split;
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};
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static void program_hpx_type1(struct pci_dev *dev, struct hpx_type1 *hpx)
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{
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int pos;
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if (!hpx)
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return;
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pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
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if (!pos)
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return;
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pci_warn(dev, "PCI-X settings not supported\n");
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}
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static acpi_status decode_type1_hpx_record(union acpi_object *record,
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struct hpx_type1 *hpx1)
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{
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int i;
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union acpi_object *fields = record->package.elements;
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u32 revision = fields[1].integer.value;
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switch (revision) {
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case 1:
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if (record->package.count != 5)
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return AE_ERROR;
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for (i = 2; i < 5; i++)
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if (fields[i].type != ACPI_TYPE_INTEGER)
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return AE_ERROR;
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hpx1->revision = revision;
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hpx1->max_mem_read = fields[2].integer.value;
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hpx1->avg_max_split = fields[3].integer.value;
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hpx1->tot_max_split = fields[4].integer.value;
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break;
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default:
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pr_warn("%s: Type 1 Revision %d record not supported\n",
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__func__, revision);
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return AE_ERROR;
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}
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return AE_OK;
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}
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static bool pcie_root_rcb_set(struct pci_dev *dev)
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{
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struct pci_dev *rp = pcie_find_root_port(dev);
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u16 lnkctl;
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if (!rp)
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return false;
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pcie_capability_read_word(rp, PCI_EXP_LNKCTL, &lnkctl);
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if (lnkctl & PCI_EXP_LNKCTL_RCB)
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return true;
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return false;
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}
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/* _HPX PCI Express Setting Record (Type 2) */
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struct hpx_type2 {
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u32 revision;
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u32 unc_err_mask_and;
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u32 unc_err_mask_or;
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u32 unc_err_sever_and;
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u32 unc_err_sever_or;
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u32 cor_err_mask_and;
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u32 cor_err_mask_or;
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u32 adv_err_cap_and;
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u32 adv_err_cap_or;
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u16 pci_exp_devctl_and;
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u16 pci_exp_devctl_or;
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u16 pci_exp_lnkctl_and;
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u16 pci_exp_lnkctl_or;
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u32 sec_unc_err_sever_and;
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u32 sec_unc_err_sever_or;
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u32 sec_unc_err_mask_and;
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u32 sec_unc_err_mask_or;
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};
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static void program_hpx_type2(struct pci_dev *dev, struct hpx_type2 *hpx)
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{
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int pos;
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u32 reg32;
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if (!hpx)
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return;
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if (!pci_is_pcie(dev))
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return;
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if (hpx->revision > 1) {
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pci_warn(dev, "PCIe settings rev %d not supported\n",
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hpx->revision);
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return;
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}
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/*
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* Don't allow _HPX to change MPS or MRRS settings. We manage
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* those to make sure they're consistent with the rest of the
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* platform.
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*/
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hpx->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
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PCI_EXP_DEVCTL_READRQ;
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hpx->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
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PCI_EXP_DEVCTL_READRQ);
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/* Initialize Device Control Register */
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pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
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~hpx->pci_exp_devctl_and, hpx->pci_exp_devctl_or);
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/* Initialize Link Control Register */
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if (pcie_cap_has_lnkctl(dev)) {
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/*
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* If the Root Port supports Read Completion Boundary of
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* 128, set RCB to 128. Otherwise, clear it.
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*/
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hpx->pci_exp_lnkctl_and |= PCI_EXP_LNKCTL_RCB;
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hpx->pci_exp_lnkctl_or &= ~PCI_EXP_LNKCTL_RCB;
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if (pcie_root_rcb_set(dev))
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hpx->pci_exp_lnkctl_or |= PCI_EXP_LNKCTL_RCB;
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pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
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~hpx->pci_exp_lnkctl_and, hpx->pci_exp_lnkctl_or);
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}
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/* Find Advanced Error Reporting Enhanced Capability */
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
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if (!pos)
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return;
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/* Initialize Uncorrectable Error Mask Register */
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32);
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reg32 = (reg32 & hpx->unc_err_mask_and) | hpx->unc_err_mask_or;
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pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
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/* Initialize Uncorrectable Error Severity Register */
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pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32);
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reg32 = (reg32 & hpx->unc_err_sever_and) | hpx->unc_err_sever_or;
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pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
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/* Initialize Correctable Error Mask Register */
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pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32);
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reg32 = (reg32 & hpx->cor_err_mask_and) | hpx->cor_err_mask_or;
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pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
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/* Initialize Advanced Error Capabilities and Control Register */
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pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
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reg32 = (reg32 & hpx->adv_err_cap_and) | hpx->adv_err_cap_or;
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/* Don't enable ECRC generation or checking if unsupported */
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if (!(reg32 & PCI_ERR_CAP_ECRC_GENC))
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reg32 &= ~PCI_ERR_CAP_ECRC_GENE;
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if (!(reg32 & PCI_ERR_CAP_ECRC_CHKC))
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reg32 &= ~PCI_ERR_CAP_ECRC_CHKE;
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pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
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/*
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* FIXME: The following two registers are not supported yet.
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*
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* o Secondary Uncorrectable Error Severity Register
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* o Secondary Uncorrectable Error Mask Register
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*/
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}
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static acpi_status decode_type2_hpx_record(union acpi_object *record,
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struct hpx_type2 *hpx2)
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{
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int i;
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union acpi_object *fields = record->package.elements;
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u32 revision = fields[1].integer.value;
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switch (revision) {
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case 1:
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if (record->package.count != 18)
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return AE_ERROR;
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for (i = 2; i < 18; i++)
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if (fields[i].type != ACPI_TYPE_INTEGER)
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return AE_ERROR;
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hpx2->revision = revision;
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hpx2->unc_err_mask_and = fields[2].integer.value;
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hpx2->unc_err_mask_or = fields[3].integer.value;
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hpx2->unc_err_sever_and = fields[4].integer.value;
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hpx2->unc_err_sever_or = fields[5].integer.value;
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hpx2->cor_err_mask_and = fields[6].integer.value;
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hpx2->cor_err_mask_or = fields[7].integer.value;
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hpx2->adv_err_cap_and = fields[8].integer.value;
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hpx2->adv_err_cap_or = fields[9].integer.value;
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hpx2->pci_exp_devctl_and = fields[10].integer.value;
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hpx2->pci_exp_devctl_or = fields[11].integer.value;
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hpx2->pci_exp_lnkctl_and = fields[12].integer.value;
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hpx2->pci_exp_lnkctl_or = fields[13].integer.value;
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hpx2->sec_unc_err_sever_and = fields[14].integer.value;
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hpx2->sec_unc_err_sever_or = fields[15].integer.value;
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hpx2->sec_unc_err_mask_and = fields[16].integer.value;
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hpx2->sec_unc_err_mask_or = fields[17].integer.value;
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break;
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default:
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pr_warn("%s: Type 2 Revision %d record not supported\n",
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__func__, revision);
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return AE_ERROR;
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}
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return AE_OK;
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}
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/* _HPX PCI Express Setting Record (Type 3) */
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struct hpx_type3 {
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u16 device_type;
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u16 function_type;
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u16 config_space_location;
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u16 pci_exp_cap_id;
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u16 pci_exp_cap_ver;
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u16 pci_exp_vendor_id;
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u16 dvsec_id;
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u16 dvsec_rev;
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u16 match_offset;
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u32 match_mask_and;
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u32 match_value;
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u16 reg_offset;
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u32 reg_mask_and;
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u32 reg_mask_or;
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};
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enum hpx_type3_dev_type {
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HPX_TYPE_ENDPOINT = BIT(0),
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HPX_TYPE_LEG_END = BIT(1),
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HPX_TYPE_RC_END = BIT(2),
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HPX_TYPE_RC_EC = BIT(3),
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HPX_TYPE_ROOT_PORT = BIT(4),
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HPX_TYPE_UPSTREAM = BIT(5),
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HPX_TYPE_DOWNSTREAM = BIT(6),
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HPX_TYPE_PCI_BRIDGE = BIT(7),
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HPX_TYPE_PCIE_BRIDGE = BIT(8),
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};
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static u16 hpx3_device_type(struct pci_dev *dev)
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{
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u16 pcie_type = pci_pcie_type(dev);
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static const int pcie_to_hpx3_type[] = {
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[PCI_EXP_TYPE_ENDPOINT] = HPX_TYPE_ENDPOINT,
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[PCI_EXP_TYPE_LEG_END] = HPX_TYPE_LEG_END,
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[PCI_EXP_TYPE_RC_END] = HPX_TYPE_RC_END,
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[PCI_EXP_TYPE_RC_EC] = HPX_TYPE_RC_EC,
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[PCI_EXP_TYPE_ROOT_PORT] = HPX_TYPE_ROOT_PORT,
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[PCI_EXP_TYPE_UPSTREAM] = HPX_TYPE_UPSTREAM,
|
|
[PCI_EXP_TYPE_DOWNSTREAM] = HPX_TYPE_DOWNSTREAM,
|
|
[PCI_EXP_TYPE_PCI_BRIDGE] = HPX_TYPE_PCI_BRIDGE,
|
|
[PCI_EXP_TYPE_PCIE_BRIDGE] = HPX_TYPE_PCIE_BRIDGE,
|
|
};
|
|
|
|
if (pcie_type >= ARRAY_SIZE(pcie_to_hpx3_type))
|
|
return 0;
|
|
|
|
return pcie_to_hpx3_type[pcie_type];
|
|
}
|
|
|
|
enum hpx_type3_fn_type {
|
|
HPX_FN_NORMAL = BIT(0),
|
|
HPX_FN_SRIOV_PHYS = BIT(1),
|
|
HPX_FN_SRIOV_VIRT = BIT(2),
|
|
};
|
|
|
|
static u8 hpx3_function_type(struct pci_dev *dev)
|
|
{
|
|
if (dev->is_virtfn)
|
|
return HPX_FN_SRIOV_VIRT;
|
|
else if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_SRIOV) > 0)
|
|
return HPX_FN_SRIOV_PHYS;
|
|
else
|
|
return HPX_FN_NORMAL;
|
|
}
|
|
|
|
static bool hpx3_cap_ver_matches(u8 pcie_cap_id, u8 hpx3_cap_id)
|
|
{
|
|
u8 cap_ver = hpx3_cap_id & 0xf;
|
|
|
|
if ((hpx3_cap_id & BIT(4)) && cap_ver >= pcie_cap_id)
|
|
return true;
|
|
else if (cap_ver == pcie_cap_id)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
enum hpx_type3_cfg_loc {
|
|
HPX_CFG_PCICFG = 0,
|
|
HPX_CFG_PCIE_CAP = 1,
|
|
HPX_CFG_PCIE_CAP_EXT = 2,
|
|
HPX_CFG_VEND_CAP = 3,
|
|
HPX_CFG_DVSEC = 4,
|
|
HPX_CFG_MAX,
|
|
};
|
|
|
|
static void program_hpx_type3_register(struct pci_dev *dev,
|
|
const struct hpx_type3 *reg)
|
|
{
|
|
u32 match_reg, write_reg, header, orig_value;
|
|
u16 pos;
|
|
|
|
if (!(hpx3_device_type(dev) & reg->device_type))
|
|
return;
|
|
|
|
if (!(hpx3_function_type(dev) & reg->function_type))
|
|
return;
|
|
|
|
switch (reg->config_space_location) {
|
|
case HPX_CFG_PCICFG:
|
|
pos = 0;
|
|
break;
|
|
case HPX_CFG_PCIE_CAP:
|
|
pos = pci_find_capability(dev, reg->pci_exp_cap_id);
|
|
if (pos == 0)
|
|
return;
|
|
|
|
break;
|
|
case HPX_CFG_PCIE_CAP_EXT:
|
|
pos = pci_find_ext_capability(dev, reg->pci_exp_cap_id);
|
|
if (pos == 0)
|
|
return;
|
|
|
|
pci_read_config_dword(dev, pos, &header);
|
|
if (!hpx3_cap_ver_matches(PCI_EXT_CAP_VER(header),
|
|
reg->pci_exp_cap_ver))
|
|
return;
|
|
|
|
break;
|
|
case HPX_CFG_VEND_CAP:
|
|
case HPX_CFG_DVSEC:
|
|
default:
|
|
pci_warn(dev, "Encountered _HPX type 3 with unsupported config space location");
|
|
return;
|
|
}
|
|
|
|
pci_read_config_dword(dev, pos + reg->match_offset, &match_reg);
|
|
|
|
if ((match_reg & reg->match_mask_and) != reg->match_value)
|
|
return;
|
|
|
|
pci_read_config_dword(dev, pos + reg->reg_offset, &write_reg);
|
|
orig_value = write_reg;
|
|
write_reg &= reg->reg_mask_and;
|
|
write_reg |= reg->reg_mask_or;
|
|
|
|
if (orig_value == write_reg)
|
|
return;
|
|
|
|
pci_write_config_dword(dev, pos + reg->reg_offset, write_reg);
|
|
|
|
pci_dbg(dev, "Applied _HPX3 at [0x%x]: 0x%08x -> 0x%08x",
|
|
pos, orig_value, write_reg);
|
|
}
|
|
|
|
static void program_hpx_type3(struct pci_dev *dev, struct hpx_type3 *hpx)
|
|
{
|
|
if (!hpx)
|
|
return;
|
|
|
|
if (!pci_is_pcie(dev))
|
|
return;
|
|
|
|
program_hpx_type3_register(dev, hpx);
|
|
}
|
|
|
|
static void parse_hpx3_register(struct hpx_type3 *hpx3_reg,
|
|
union acpi_object *reg_fields)
|
|
{
|
|
hpx3_reg->device_type = reg_fields[0].integer.value;
|
|
hpx3_reg->function_type = reg_fields[1].integer.value;
|
|
hpx3_reg->config_space_location = reg_fields[2].integer.value;
|
|
hpx3_reg->pci_exp_cap_id = reg_fields[3].integer.value;
|
|
hpx3_reg->pci_exp_cap_ver = reg_fields[4].integer.value;
|
|
hpx3_reg->pci_exp_vendor_id = reg_fields[5].integer.value;
|
|
hpx3_reg->dvsec_id = reg_fields[6].integer.value;
|
|
hpx3_reg->dvsec_rev = reg_fields[7].integer.value;
|
|
hpx3_reg->match_offset = reg_fields[8].integer.value;
|
|
hpx3_reg->match_mask_and = reg_fields[9].integer.value;
|
|
hpx3_reg->match_value = reg_fields[10].integer.value;
|
|
hpx3_reg->reg_offset = reg_fields[11].integer.value;
|
|
hpx3_reg->reg_mask_and = reg_fields[12].integer.value;
|
|
hpx3_reg->reg_mask_or = reg_fields[13].integer.value;
|
|
}
|
|
|
|
static acpi_status program_type3_hpx_record(struct pci_dev *dev,
|
|
union acpi_object *record)
|
|
{
|
|
union acpi_object *fields = record->package.elements;
|
|
u32 desc_count, expected_length, revision;
|
|
union acpi_object *reg_fields;
|
|
struct hpx_type3 hpx3;
|
|
int i;
|
|
|
|
revision = fields[1].integer.value;
|
|
switch (revision) {
|
|
case 1:
|
|
desc_count = fields[2].integer.value;
|
|
expected_length = 3 + desc_count * 14;
|
|
|
|
if (record->package.count != expected_length)
|
|
return AE_ERROR;
|
|
|
|
for (i = 2; i < expected_length; i++)
|
|
if (fields[i].type != ACPI_TYPE_INTEGER)
|
|
return AE_ERROR;
|
|
|
|
for (i = 0; i < desc_count; i++) {
|
|
reg_fields = fields + 3 + i * 14;
|
|
parse_hpx3_register(&hpx3, reg_fields);
|
|
program_hpx_type3(dev, &hpx3);
|
|
}
|
|
|
|
break;
|
|
default:
|
|
printk(KERN_WARNING
|
|
"%s: Type 3 Revision %d record not supported\n",
|
|
__func__, revision);
|
|
return AE_ERROR;
|
|
}
|
|
return AE_OK;
|
|
}
|
|
|
|
static acpi_status acpi_run_hpx(struct pci_dev *dev, acpi_handle handle)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
union acpi_object *package, *record, *fields;
|
|
struct hpx_type0 hpx0;
|
|
struct hpx_type1 hpx1;
|
|
struct hpx_type2 hpx2;
|
|
u32 type;
|
|
int i;
|
|
|
|
status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
package = (union acpi_object *)buffer.pointer;
|
|
if (package->type != ACPI_TYPE_PACKAGE) {
|
|
status = AE_ERROR;
|
|
goto exit;
|
|
}
|
|
|
|
for (i = 0; i < package->package.count; i++) {
|
|
record = &package->package.elements[i];
|
|
if (record->type != ACPI_TYPE_PACKAGE) {
|
|
status = AE_ERROR;
|
|
goto exit;
|
|
}
|
|
|
|
fields = record->package.elements;
|
|
if (fields[0].type != ACPI_TYPE_INTEGER ||
|
|
fields[1].type != ACPI_TYPE_INTEGER) {
|
|
status = AE_ERROR;
|
|
goto exit;
|
|
}
|
|
|
|
type = fields[0].integer.value;
|
|
switch (type) {
|
|
case 0:
|
|
memset(&hpx0, 0, sizeof(hpx0));
|
|
status = decode_type0_hpx_record(record, &hpx0);
|
|
if (ACPI_FAILURE(status))
|
|
goto exit;
|
|
program_hpx_type0(dev, &hpx0);
|
|
break;
|
|
case 1:
|
|
memset(&hpx1, 0, sizeof(hpx1));
|
|
status = decode_type1_hpx_record(record, &hpx1);
|
|
if (ACPI_FAILURE(status))
|
|
goto exit;
|
|
program_hpx_type1(dev, &hpx1);
|
|
break;
|
|
case 2:
|
|
memset(&hpx2, 0, sizeof(hpx2));
|
|
status = decode_type2_hpx_record(record, &hpx2);
|
|
if (ACPI_FAILURE(status))
|
|
goto exit;
|
|
program_hpx_type2(dev, &hpx2);
|
|
break;
|
|
case 3:
|
|
status = program_type3_hpx_record(dev, record);
|
|
if (ACPI_FAILURE(status))
|
|
goto exit;
|
|
break;
|
|
default:
|
|
pr_err("%s: Type %d record not supported\n",
|
|
__func__, type);
|
|
status = AE_ERROR;
|
|
goto exit;
|
|
}
|
|
}
|
|
exit:
|
|
kfree(buffer.pointer);
|
|
return status;
|
|
}
|
|
|
|
static acpi_status acpi_run_hpp(struct pci_dev *dev, acpi_handle handle)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
union acpi_object *package, *fields;
|
|
struct hpx_type0 hpx0;
|
|
int i;
|
|
|
|
memset(&hpx0, 0, sizeof(hpx0));
|
|
|
|
status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
package = (union acpi_object *) buffer.pointer;
|
|
if (package->type != ACPI_TYPE_PACKAGE ||
|
|
package->package.count != 4) {
|
|
status = AE_ERROR;
|
|
goto exit;
|
|
}
|
|
|
|
fields = package->package.elements;
|
|
for (i = 0; i < 4; i++) {
|
|
if (fields[i].type != ACPI_TYPE_INTEGER) {
|
|
status = AE_ERROR;
|
|
goto exit;
|
|
}
|
|
}
|
|
|
|
hpx0.revision = 1;
|
|
hpx0.cache_line_size = fields[0].integer.value;
|
|
hpx0.latency_timer = fields[1].integer.value;
|
|
hpx0.enable_serr = fields[2].integer.value;
|
|
hpx0.enable_perr = fields[3].integer.value;
|
|
|
|
program_hpx_type0(dev, &hpx0);
|
|
|
|
exit:
|
|
kfree(buffer.pointer);
|
|
return status;
|
|
}
|
|
|
|
/* pci_acpi_program_hp_params
|
|
*
|
|
* @dev - the pci_dev for which we want parameters
|
|
*/
|
|
int pci_acpi_program_hp_params(struct pci_dev *dev)
|
|
{
|
|
acpi_status status;
|
|
acpi_handle handle, phandle;
|
|
struct pci_bus *pbus;
|
|
|
|
if (acpi_pci_disabled)
|
|
return -ENODEV;
|
|
|
|
handle = NULL;
|
|
for (pbus = dev->bus; pbus; pbus = pbus->parent) {
|
|
handle = acpi_pci_get_bridge_handle(pbus);
|
|
if (handle)
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* _HPP settings apply to all child buses, until another _HPP is
|
|
* encountered. If we don't find an _HPP for the input pci dev,
|
|
* look for it in the parent device scope since that would apply to
|
|
* this pci dev.
|
|
*/
|
|
while (handle) {
|
|
status = acpi_run_hpx(dev, handle);
|
|
if (ACPI_SUCCESS(status))
|
|
return 0;
|
|
status = acpi_run_hpp(dev, handle);
|
|
if (ACPI_SUCCESS(status))
|
|
return 0;
|
|
if (acpi_is_root_bridge(handle))
|
|
break;
|
|
status = acpi_get_parent(handle, &phandle);
|
|
if (ACPI_FAILURE(status))
|
|
break;
|
|
handle = phandle;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* pciehp_is_native - Check whether a hotplug port is handled by the OS
|
|
* @bridge: Hotplug port to check
|
|
*
|
|
* Returns true if the given @bridge is handled by the native PCIe hotplug
|
|
* driver.
|
|
*/
|
|
bool pciehp_is_native(struct pci_dev *bridge)
|
|
{
|
|
const struct pci_host_bridge *host;
|
|
u32 slot_cap;
|
|
|
|
if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
|
|
return false;
|
|
|
|
pcie_capability_read_dword(bridge, PCI_EXP_SLTCAP, &slot_cap);
|
|
if (!(slot_cap & PCI_EXP_SLTCAP_HPC))
|
|
return false;
|
|
|
|
if (pcie_ports_native)
|
|
return true;
|
|
|
|
host = pci_find_host_bridge(bridge->bus);
|
|
return host->native_pcie_hotplug;
|
|
}
|
|
|
|
/**
|
|
* shpchp_is_native - Check whether a hotplug port is handled by the OS
|
|
* @bridge: Hotplug port to check
|
|
*
|
|
* Returns true if the given @bridge is handled by the native SHPC hotplug
|
|
* driver.
|
|
*/
|
|
bool shpchp_is_native(struct pci_dev *bridge)
|
|
{
|
|
return bridge->shpc_managed;
|
|
}
|
|
|
|
/**
|
|
* pci_acpi_wake_bus - Root bus wakeup notification fork function.
|
|
* @context: Device wakeup context.
|
|
*/
|
|
static void pci_acpi_wake_bus(struct acpi_device_wakeup_context *context)
|
|
{
|
|
struct acpi_device *adev;
|
|
struct acpi_pci_root *root;
|
|
|
|
adev = container_of(context, struct acpi_device, wakeup.context);
|
|
root = acpi_driver_data(adev);
|
|
pci_pme_wakeup_bus(root->bus);
|
|
}
|
|
|
|
/**
|
|
* pci_acpi_wake_dev - PCI device wakeup notification work function.
|
|
* @context: Device wakeup context.
|
|
*/
|
|
static void pci_acpi_wake_dev(struct acpi_device_wakeup_context *context)
|
|
{
|
|
struct pci_dev *pci_dev;
|
|
|
|
pci_dev = to_pci_dev(context->dev);
|
|
|
|
if (pci_dev->pme_poll)
|
|
pci_dev->pme_poll = false;
|
|
|
|
if (pci_dev->current_state == PCI_D3cold) {
|
|
pci_wakeup_event(pci_dev);
|
|
pm_request_resume(&pci_dev->dev);
|
|
return;
|
|
}
|
|
|
|
/* Clear PME Status if set. */
|
|
if (pci_dev->pme_support)
|
|
pci_check_pme_status(pci_dev);
|
|
|
|
pci_wakeup_event(pci_dev);
|
|
pm_request_resume(&pci_dev->dev);
|
|
|
|
pci_pme_wakeup_bus(pci_dev->subordinate);
|
|
}
|
|
|
|
/**
|
|
* pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
|
|
* @dev: PCI root bridge ACPI device.
|
|
*/
|
|
acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
|
|
{
|
|
return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
|
|
}
|
|
|
|
/**
|
|
* pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
|
|
* @dev: ACPI device to add the notifier for.
|
|
* @pci_dev: PCI device to check for the PME status if an event is signaled.
|
|
*/
|
|
acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
|
|
struct pci_dev *pci_dev)
|
|
{
|
|
return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
|
|
}
|
|
|
|
/*
|
|
* _SxD returns the D-state with the highest power
|
|
* (lowest D-state number) supported in the S-state "x".
|
|
*
|
|
* If the devices does not have a _PRW
|
|
* (Power Resources for Wake) supporting system wakeup from "x"
|
|
* then the OS is free to choose a lower power (higher number
|
|
* D-state) than the return value from _SxD.
|
|
*
|
|
* But if _PRW is enabled at S-state "x", the OS
|
|
* must not choose a power lower than _SxD --
|
|
* unless the device has an _SxW method specifying
|
|
* the lowest power (highest D-state number) the device
|
|
* may enter while still able to wake the system.
|
|
*
|
|
* ie. depending on global OS policy:
|
|
*
|
|
* if (_PRW at S-state x)
|
|
* choose from highest power _SxD to lowest power _SxW
|
|
* else // no _PRW at S-state x
|
|
* choose highest power _SxD or any lower power
|
|
*/
|
|
|
|
pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
|
|
{
|
|
int acpi_state, d_max;
|
|
|
|
if (pdev->no_d3cold)
|
|
d_max = ACPI_STATE_D3_HOT;
|
|
else
|
|
d_max = ACPI_STATE_D3_COLD;
|
|
acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
|
|
if (acpi_state < 0)
|
|
return PCI_POWER_ERROR;
|
|
|
|
switch (acpi_state) {
|
|
case ACPI_STATE_D0:
|
|
return PCI_D0;
|
|
case ACPI_STATE_D1:
|
|
return PCI_D1;
|
|
case ACPI_STATE_D2:
|
|
return PCI_D2;
|
|
case ACPI_STATE_D3_HOT:
|
|
return PCI_D3hot;
|
|
case ACPI_STATE_D3_COLD:
|
|
return PCI_D3cold;
|
|
}
|
|
return PCI_POWER_ERROR;
|
|
}
|
|
|
|
static struct acpi_device *acpi_pci_find_companion(struct device *dev);
|
|
|
|
void pci_set_acpi_fwnode(struct pci_dev *dev)
|
|
{
|
|
if (!dev_fwnode(&dev->dev) && !pci_dev_is_added(dev))
|
|
ACPI_COMPANION_SET(&dev->dev,
|
|
acpi_pci_find_companion(&dev->dev));
|
|
}
|
|
|
|
/**
|
|
* pci_dev_acpi_reset - do a function level reset using _RST method
|
|
* @dev: device to reset
|
|
* @probe: if true, return 0 if device supports _RST
|
|
*/
|
|
int pci_dev_acpi_reset(struct pci_dev *dev, bool probe)
|
|
{
|
|
acpi_handle handle = ACPI_HANDLE(&dev->dev);
|
|
|
|
if (!handle || !acpi_has_method(handle, "_RST"))
|
|
return -ENOTTY;
|
|
|
|
if (probe)
|
|
return 0;
|
|
|
|
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_RST", NULL, NULL))) {
|
|
pci_warn(dev, "ACPI _RST failed\n");
|
|
return -ENOTTY;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool acpi_pci_power_manageable(struct pci_dev *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
|
|
|
|
return adev && acpi_device_power_manageable(adev);
|
|
}
|
|
|
|
bool acpi_pci_bridge_d3(struct pci_dev *dev)
|
|
{
|
|
const union acpi_object *obj;
|
|
struct acpi_device *adev;
|
|
struct pci_dev *rpdev;
|
|
|
|
if (acpi_pci_disabled || !dev->is_hotplug_bridge)
|
|
return false;
|
|
|
|
/* Assume D3 support if the bridge is power-manageable by ACPI. */
|
|
if (acpi_pci_power_manageable(dev))
|
|
return true;
|
|
|
|
/*
|
|
* The ACPI firmware will provide the device-specific properties through
|
|
* _DSD configuration object. Look for the 'HotPlugSupportInD3' property
|
|
* for the root port and if it is set we know the hierarchy behind it
|
|
* supports D3 just fine.
|
|
*/
|
|
rpdev = pcie_find_root_port(dev);
|
|
if (!rpdev)
|
|
return false;
|
|
|
|
adev = ACPI_COMPANION(&rpdev->dev);
|
|
if (!adev)
|
|
return false;
|
|
|
|
if (acpi_dev_get_property(adev, "HotPlugSupportInD3",
|
|
ACPI_TYPE_INTEGER, &obj) < 0)
|
|
return false;
|
|
|
|
return obj->integer.value == 1;
|
|
}
|
|
|
|
int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
|
|
static const u8 state_conv[] = {
|
|
[PCI_D0] = ACPI_STATE_D0,
|
|
[PCI_D1] = ACPI_STATE_D1,
|
|
[PCI_D2] = ACPI_STATE_D2,
|
|
[PCI_D3hot] = ACPI_STATE_D3_HOT,
|
|
[PCI_D3cold] = ACPI_STATE_D3_COLD,
|
|
};
|
|
int error = -EINVAL;
|
|
|
|
/* If the ACPI device has _EJ0, ignore the device */
|
|
if (!adev || acpi_has_method(adev->handle, "_EJ0"))
|
|
return -ENODEV;
|
|
|
|
switch (state) {
|
|
case PCI_D3cold:
|
|
if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
|
|
PM_QOS_FLAGS_ALL) {
|
|
error = -EBUSY;
|
|
break;
|
|
}
|
|
fallthrough;
|
|
case PCI_D0:
|
|
case PCI_D1:
|
|
case PCI_D2:
|
|
case PCI_D3hot:
|
|
error = acpi_device_set_power(adev, state_conv[state]);
|
|
}
|
|
|
|
if (!error)
|
|
pci_dbg(dev, "power state changed by ACPI to %s\n",
|
|
acpi_power_state_string(adev->power.state));
|
|
|
|
return error;
|
|
}
|
|
|
|
pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
|
|
static const pci_power_t state_conv[] = {
|
|
[ACPI_STATE_D0] = PCI_D0,
|
|
[ACPI_STATE_D1] = PCI_D1,
|
|
[ACPI_STATE_D2] = PCI_D2,
|
|
[ACPI_STATE_D3_HOT] = PCI_D3hot,
|
|
[ACPI_STATE_D3_COLD] = PCI_D3cold,
|
|
};
|
|
int state;
|
|
|
|
if (!adev || !acpi_device_power_manageable(adev))
|
|
return PCI_UNKNOWN;
|
|
|
|
state = adev->power.state;
|
|
if (state == ACPI_STATE_UNKNOWN)
|
|
return PCI_UNKNOWN;
|
|
|
|
return state_conv[state];
|
|
}
|
|
|
|
void acpi_pci_refresh_power_state(struct pci_dev *dev)
|
|
{
|
|
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
|
|
|
|
if (adev && acpi_device_power_manageable(adev))
|
|
acpi_device_update_power(adev, NULL);
|
|
}
|
|
|
|
static int acpi_pci_propagate_wakeup(struct pci_bus *bus, bool enable)
|
|
{
|
|
while (bus->parent) {
|
|
if (acpi_pm_device_can_wakeup(&bus->self->dev))
|
|
return acpi_pm_set_device_wakeup(&bus->self->dev, enable);
|
|
|
|
bus = bus->parent;
|
|
}
|
|
|
|
/* We have reached the root bus. */
|
|
if (bus->bridge) {
|
|
if (acpi_pm_device_can_wakeup(bus->bridge))
|
|
return acpi_pm_set_device_wakeup(bus->bridge, enable);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int acpi_pci_wakeup(struct pci_dev *dev, bool enable)
|
|
{
|
|
if (acpi_pci_disabled)
|
|
return 0;
|
|
|
|
if (acpi_pm_device_can_wakeup(&dev->dev))
|
|
return acpi_pm_set_device_wakeup(&dev->dev, enable);
|
|
|
|
return acpi_pci_propagate_wakeup(dev->bus, enable);
|
|
}
|
|
|
|
bool acpi_pci_need_resume(struct pci_dev *dev)
|
|
{
|
|
struct acpi_device *adev;
|
|
|
|
if (acpi_pci_disabled)
|
|
return false;
|
|
|
|
/*
|
|
* In some cases (eg. Samsung 305V4A) leaving a bridge in suspend over
|
|
* system-wide suspend/resume confuses the platform firmware, so avoid
|
|
* doing that. According to Section 16.1.6 of ACPI 6.2, endpoint
|
|
* devices are expected to be in D3 before invoking the S3 entry path
|
|
* from the firmware, so they should not be affected by this issue.
|
|
*/
|
|
if (pci_is_bridge(dev) && acpi_target_system_state() != ACPI_STATE_S0)
|
|
return true;
|
|
|
|
adev = ACPI_COMPANION(&dev->dev);
|
|
if (!adev || !acpi_device_power_manageable(adev))
|
|
return false;
|
|
|
|
if (adev->wakeup.flags.valid &&
|
|
device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
|
|
return true;
|
|
|
|
if (acpi_target_system_state() == ACPI_STATE_S0)
|
|
return false;
|
|
|
|
return !!adev->power.flags.dsw_present;
|
|
}
|
|
|
|
void acpi_pci_add_bus(struct pci_bus *bus)
|
|
{
|
|
union acpi_object *obj;
|
|
struct pci_host_bridge *bridge;
|
|
|
|
if (acpi_pci_disabled || !bus->bridge || !ACPI_HANDLE(bus->bridge))
|
|
return;
|
|
|
|
acpi_pci_slot_enumerate(bus);
|
|
acpiphp_enumerate_slots(bus);
|
|
|
|
/*
|
|
* For a host bridge, check its _DSM for function 8 and if
|
|
* that is available, mark it in pci_host_bridge.
|
|
*/
|
|
if (!pci_is_root_bus(bus))
|
|
return;
|
|
|
|
obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3,
|
|
DSM_PCI_POWER_ON_RESET_DELAY, NULL);
|
|
if (!obj)
|
|
return;
|
|
|
|
if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
|
|
bridge = pci_find_host_bridge(bus);
|
|
bridge->ignore_reset_delay = 1;
|
|
}
|
|
ACPI_FREE(obj);
|
|
}
|
|
|
|
void acpi_pci_remove_bus(struct pci_bus *bus)
|
|
{
|
|
if (acpi_pci_disabled || !bus->bridge)
|
|
return;
|
|
|
|
acpiphp_remove_slots(bus);
|
|
acpi_pci_slot_remove(bus);
|
|
}
|
|
|
|
/* ACPI bus type */
|
|
|
|
|
|
static DECLARE_RWSEM(pci_acpi_companion_lookup_sem);
|
|
static struct acpi_device *(*pci_acpi_find_companion_hook)(struct pci_dev *);
|
|
|
|
/**
|
|
* pci_acpi_set_companion_lookup_hook - Set ACPI companion lookup callback.
|
|
* @func: ACPI companion lookup callback pointer or NULL.
|
|
*
|
|
* Set a special ACPI companion lookup callback for PCI devices whose companion
|
|
* objects in the ACPI namespace have _ADR with non-standard bus-device-function
|
|
* encodings.
|
|
*
|
|
* Return 0 on success or a negative error code on failure (in which case no
|
|
* changes are made).
|
|
*
|
|
* The caller is responsible for the appropriate ordering of the invocations of
|
|
* this function with respect to the enumeration of the PCI devices needing the
|
|
* callback installed by it.
|
|
*/
|
|
int pci_acpi_set_companion_lookup_hook(struct acpi_device *(*func)(struct pci_dev *))
|
|
{
|
|
int ret;
|
|
|
|
if (!func)
|
|
return -EINVAL;
|
|
|
|
down_write(&pci_acpi_companion_lookup_sem);
|
|
|
|
if (pci_acpi_find_companion_hook) {
|
|
ret = -EBUSY;
|
|
} else {
|
|
pci_acpi_find_companion_hook = func;
|
|
ret = 0;
|
|
}
|
|
|
|
up_write(&pci_acpi_companion_lookup_sem);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_acpi_set_companion_lookup_hook);
|
|
|
|
/**
|
|
* pci_acpi_clear_companion_lookup_hook - Clear ACPI companion lookup callback.
|
|
*
|
|
* Clear the special ACPI companion lookup callback previously set by
|
|
* pci_acpi_set_companion_lookup_hook(). Block until the last running instance
|
|
* of the callback returns before clearing it.
|
|
*
|
|
* The caller is responsible for the appropriate ordering of the invocations of
|
|
* this function with respect to the enumeration of the PCI devices needing the
|
|
* callback cleared by it.
|
|
*/
|
|
void pci_acpi_clear_companion_lookup_hook(void)
|
|
{
|
|
down_write(&pci_acpi_companion_lookup_sem);
|
|
|
|
pci_acpi_find_companion_hook = NULL;
|
|
|
|
up_write(&pci_acpi_companion_lookup_sem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_acpi_clear_companion_lookup_hook);
|
|
|
|
static struct acpi_device *acpi_pci_find_companion(struct device *dev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
struct acpi_device *adev;
|
|
bool check_children;
|
|
u64 addr;
|
|
|
|
if (!dev->parent)
|
|
return NULL;
|
|
|
|
down_read(&pci_acpi_companion_lookup_sem);
|
|
|
|
adev = pci_acpi_find_companion_hook ?
|
|
pci_acpi_find_companion_hook(pci_dev) : NULL;
|
|
|
|
up_read(&pci_acpi_companion_lookup_sem);
|
|
|
|
if (adev)
|
|
return adev;
|
|
|
|
check_children = pci_is_bridge(pci_dev);
|
|
/* Please ref to ACPI spec for the syntax of _ADR */
|
|
addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
|
|
adev = acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
|
|
check_children);
|
|
|
|
/*
|
|
* There may be ACPI device objects in the ACPI namespace that are
|
|
* children of the device object representing the host bridge, but don't
|
|
* represent PCI devices. Both _HID and _ADR may be present for them,
|
|
* even though that is against the specification (for example, see
|
|
* Section 6.1 of ACPI 6.3), but in many cases the _ADR returns 0 which
|
|
* appears to indicate that they should not be taken into consideration
|
|
* as potential companions of PCI devices on the root bus.
|
|
*
|
|
* To catch this special case, disregard the returned device object if
|
|
* it has a valid _HID, addr is 0 and the PCI device at hand is on the
|
|
* root bus.
|
|
*/
|
|
if (adev && adev->pnp.type.platform_id && !addr &&
|
|
pci_is_root_bus(pci_dev->bus))
|
|
return NULL;
|
|
|
|
return adev;
|
|
}
|
|
|
|
/**
|
|
* pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
|
|
* @pdev: the PCI device whose delay is to be updated
|
|
* @handle: ACPI handle of this device
|
|
*
|
|
* Update the d3hot_delay and d3cold_delay of a PCI device from the ACPI _DSM
|
|
* control method of either the device itself or the PCI host bridge.
|
|
*
|
|
* Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
|
|
* host bridge. If it returns one, the OS may assume that all devices in
|
|
* the hierarchy have already completed power-on reset delays.
|
|
*
|
|
* Function 9, "Device Readiness Durations," applies only to the object
|
|
* where it is located. It returns delay durations required after various
|
|
* events if the device requires less time than the spec requires. Delays
|
|
* from this function take precedence over the Reset Delay function.
|
|
*
|
|
* These _DSM functions are defined by the draft ECN of January 28, 2014,
|
|
* titled "ACPI additions for FW latency optimizations."
|
|
*/
|
|
static void pci_acpi_optimize_delay(struct pci_dev *pdev,
|
|
acpi_handle handle)
|
|
{
|
|
struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
|
|
int value;
|
|
union acpi_object *obj, *elements;
|
|
|
|
if (bridge->ignore_reset_delay)
|
|
pdev->d3cold_delay = 0;
|
|
|
|
obj = acpi_evaluate_dsm(handle, &pci_acpi_dsm_guid, 3,
|
|
DSM_PCI_DEVICE_READINESS_DURATIONS, NULL);
|
|
if (!obj)
|
|
return;
|
|
|
|
if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
|
|
elements = obj->package.elements;
|
|
if (elements[0].type == ACPI_TYPE_INTEGER) {
|
|
value = (int)elements[0].integer.value / 1000;
|
|
if (value < PCI_PM_D3COLD_WAIT)
|
|
pdev->d3cold_delay = value;
|
|
}
|
|
if (elements[3].type == ACPI_TYPE_INTEGER) {
|
|
value = (int)elements[3].integer.value / 1000;
|
|
if (value < PCI_PM_D3HOT_WAIT)
|
|
pdev->d3hot_delay = value;
|
|
}
|
|
}
|
|
ACPI_FREE(obj);
|
|
}
|
|
|
|
static void pci_acpi_set_external_facing(struct pci_dev *dev)
|
|
{
|
|
u8 val;
|
|
|
|
if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT)
|
|
return;
|
|
if (device_property_read_u8(&dev->dev, "ExternalFacingPort", &val))
|
|
return;
|
|
|
|
/*
|
|
* These root ports expose PCIe (including DMA) outside of the
|
|
* system. Everything downstream from them is external.
|
|
*/
|
|
if (val)
|
|
dev->external_facing = 1;
|
|
}
|
|
|
|
void pci_acpi_setup(struct device *dev, struct acpi_device *adev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
|
|
pci_acpi_optimize_delay(pci_dev, adev->handle);
|
|
pci_acpi_set_external_facing(pci_dev);
|
|
pci_acpi_add_edr_notifier(pci_dev);
|
|
|
|
pci_acpi_add_pm_notifier(adev, pci_dev);
|
|
if (!adev->wakeup.flags.valid)
|
|
return;
|
|
|
|
device_set_wakeup_capable(dev, true);
|
|
/*
|
|
* For bridges that can do D3 we enable wake automatically (as
|
|
* we do for the power management itself in that case). The
|
|
* reason is that the bridge may have additional methods such as
|
|
* _DSW that need to be called.
|
|
*/
|
|
if (pci_dev->bridge_d3)
|
|
device_wakeup_enable(dev);
|
|
|
|
acpi_pci_wakeup(pci_dev, false);
|
|
acpi_device_power_add_dependent(adev, dev);
|
|
}
|
|
|
|
void pci_acpi_cleanup(struct device *dev, struct acpi_device *adev)
|
|
{
|
|
struct pci_dev *pci_dev = to_pci_dev(dev);
|
|
|
|
pci_acpi_remove_edr_notifier(pci_dev);
|
|
pci_acpi_remove_pm_notifier(adev);
|
|
if (adev->wakeup.flags.valid) {
|
|
acpi_device_power_remove_dependent(adev, dev);
|
|
if (pci_dev->bridge_d3)
|
|
device_wakeup_disable(dev);
|
|
|
|
device_set_wakeup_capable(dev, false);
|
|
}
|
|
}
|
|
|
|
static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
|
|
|
|
/**
|
|
* pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
|
|
* @fn: Callback matching a device to a fwnode that identifies a PCI
|
|
* MSI domain.
|
|
*
|
|
* This should be called by irqchip driver, which is the parent of
|
|
* the MSI domain to provide callback interface to query fwnode.
|
|
*/
|
|
void
|
|
pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
|
|
{
|
|
pci_msi_get_fwnode_cb = fn;
|
|
}
|
|
|
|
/**
|
|
* pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
|
|
* @bus: The PCI host bridge bus.
|
|
*
|
|
* This function uses the callback function registered by
|
|
* pci_msi_register_fwnode_provider() to retrieve the irq_domain with
|
|
* type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
|
|
* This returns NULL on error or when the domain is not found.
|
|
*/
|
|
struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
|
|
{
|
|
struct fwnode_handle *fwnode;
|
|
|
|
if (!pci_msi_get_fwnode_cb)
|
|
return NULL;
|
|
|
|
fwnode = pci_msi_get_fwnode_cb(&bus->dev);
|
|
if (!fwnode)
|
|
return NULL;
|
|
|
|
return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
|
|
}
|
|
|
|
static int __init acpi_pci_init(void)
|
|
{
|
|
if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
|
|
pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
|
|
pci_no_msi();
|
|
}
|
|
|
|
if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
|
|
pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
|
|
pcie_no_aspm();
|
|
}
|
|
|
|
if (acpi_pci_disabled)
|
|
return 0;
|
|
|
|
acpi_pci_slot_init();
|
|
acpiphp_init();
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(acpi_pci_init);
|