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pci-acpi.c
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pci-acpi.c
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// SPDX-License-Identifier: GPL-2.0
/*
* PCI support in ACPI
*
* Copyright (C) 2005 David Shaohua Li <[email protected]>
* Copyright (C) 2004 Tom Long Nguyen <[email protected]>
* Copyright (C) 2004 Intel Corp.
*/
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/irqdomain.h>
#include <linux/pci.h>
#include <linux/msi.h>
#include <linux/pci_hotplug.h>
#include <linux/module.h>
#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
#include <linux/pm_qos.h>
#include "pci.h"
/*
* The GUID is defined in the PCI Firmware Specification available here:
* https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
*/
const guid_t pci_acpi_dsm_guid =
GUID_INIT(0xe5c937d0, 0x3553, 0x4d7a,
0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d);
#if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
{
struct device *dev = &adev->dev;
struct resource_entry *entry;
struct list_head list;
unsigned long flags;
int ret;
INIT_LIST_HEAD(&list);
flags = IORESOURCE_MEM;
ret = acpi_dev_get_resources(adev, &list,
acpi_dev_filter_resource_type_cb,
(void *) flags);
if (ret < 0) {
dev_err(dev, "failed to parse _CRS method, error code %d\n",
ret);
return ret;
}
if (ret == 0) {
dev_err(dev, "no IO and memory resources present in _CRS\n");
return -EINVAL;
}
entry = list_first_entry(&list, struct resource_entry, node);
*res = *entry->res;
acpi_dev_free_resource_list(&list);
return 0;
}
static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
void **retval)
{
u16 *segment = context;
unsigned long long uid;
acpi_status status;
status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
if (ACPI_FAILURE(status) || uid != *segment)
return AE_CTRL_DEPTH;
*(acpi_handle *)retval = handle;
return AE_CTRL_TERMINATE;
}
int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
struct resource *res)
{
struct acpi_device *adev;
acpi_status status;
acpi_handle handle;
int ret;
status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
if (ACPI_FAILURE(status)) {
dev_err(dev, "can't find _HID %s device to locate resources\n",
hid);
return -ENODEV;
}
ret = acpi_bus_get_device(handle, &adev);
if (ret)
return ret;
ret = acpi_get_rc_addr(adev, res);
if (ret) {
dev_err(dev, "can't get resource from %s\n",
dev_name(&adev->dev));
return ret;
}
return 0;
}
#endif
phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
{
acpi_status status = AE_NOT_EXIST;
unsigned long long mcfg_addr;
if (handle)
status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
NULL, &mcfg_addr);
if (ACPI_FAILURE(status))
return 0;
return (phys_addr_t)mcfg_addr;
}
/* _HPX PCI Setting Record (Type 0); same as _HPP */
struct hpx_type0 {
u32 revision; /* Not present in _HPP */
u8 cache_line_size; /* Not applicable to PCIe */
u8 latency_timer; /* Not applicable to PCIe */
u8 enable_serr;
u8 enable_perr;
};
static struct hpx_type0 pci_default_type0 = {
.revision = 1,
.cache_line_size = 8,
.latency_timer = 0x40,
.enable_serr = 0,
.enable_perr = 0,
};
static void program_hpx_type0(struct pci_dev *dev, struct hpx_type0 *hpx)
{
u16 pci_cmd, pci_bctl;
if (!hpx)
hpx = &pci_default_type0;
if (hpx->revision > 1) {
pci_warn(dev, "PCI settings rev %d not supported; using defaults\n",
hpx->revision);
hpx = &pci_default_type0;
}
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpx->cache_line_size);
pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpx->latency_timer);
pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
if (hpx->enable_serr)
pci_cmd |= PCI_COMMAND_SERR;
if (hpx->enable_perr)
pci_cmd |= PCI_COMMAND_PARITY;
pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
/* Program bridge control value */
if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
hpx->latency_timer);
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
if (hpx->enable_perr)
pci_bctl |= PCI_BRIDGE_CTL_PARITY;
pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
}
}
static acpi_status decode_type0_hpx_record(union acpi_object *record,
struct hpx_type0 *hpx0)
{
int i;
union acpi_object *fields = record->package.elements;
u32 revision = fields[1].integer.value;
switch (revision) {
case 1:
if (record->package.count != 6)
return AE_ERROR;
for (i = 2; i < 6; i++)
if (fields[i].type != ACPI_TYPE_INTEGER)
return AE_ERROR;
hpx0->revision = revision;
hpx0->cache_line_size = fields[2].integer.value;
hpx0->latency_timer = fields[3].integer.value;
hpx0->enable_serr = fields[4].integer.value;
hpx0->enable_perr = fields[5].integer.value;
break;
default:
pr_warn("%s: Type 0 Revision %d record not supported\n",
__func__, revision);
return AE_ERROR;
}
return AE_OK;
}
/* _HPX PCI-X Setting Record (Type 1) */
struct hpx_type1 {
u32 revision;
u8 max_mem_read;
u8 avg_max_split;
u16 tot_max_split;
};
static void program_hpx_type1(struct pci_dev *dev, struct hpx_type1 *hpx)
{
int pos;
if (!hpx)
return;
pos = pci_find_capability(dev, PCI_CAP_ID_PCIX);
if (!pos)
return;
pci_warn(dev, "PCI-X settings not supported\n");
}
static acpi_status decode_type1_hpx_record(union acpi_object *record,
struct hpx_type1 *hpx1)
{
int i;
union acpi_object *fields = record->package.elements;
u32 revision = fields[1].integer.value;
switch (revision) {
case 1:
if (record->package.count != 5)
return AE_ERROR;
for (i = 2; i < 5; i++)
if (fields[i].type != ACPI_TYPE_INTEGER)
return AE_ERROR;
hpx1->revision = revision;
hpx1->max_mem_read = fields[2].integer.value;
hpx1->avg_max_split = fields[3].integer.value;
hpx1->tot_max_split = fields[4].integer.value;
break;
default:
pr_warn("%s: Type 1 Revision %d record not supported\n",
__func__, revision);
return AE_ERROR;
}
return AE_OK;
}
static bool pcie_root_rcb_set(struct pci_dev *dev)
{
struct pci_dev *rp = pcie_find_root_port(dev);
u16 lnkctl;
if (!rp)
return false;
pcie_capability_read_word(rp, PCI_EXP_LNKCTL, &lnkctl);
if (lnkctl & PCI_EXP_LNKCTL_RCB)
return true;
return false;
}
/* _HPX PCI Express Setting Record (Type 2) */
struct hpx_type2 {
u32 revision;
u32 unc_err_mask_and;
u32 unc_err_mask_or;
u32 unc_err_sever_and;
u32 unc_err_sever_or;
u32 cor_err_mask_and;
u32 cor_err_mask_or;
u32 adv_err_cap_and;
u32 adv_err_cap_or;
u16 pci_exp_devctl_and;
u16 pci_exp_devctl_or;
u16 pci_exp_lnkctl_and;
u16 pci_exp_lnkctl_or;
u32 sec_unc_err_sever_and;
u32 sec_unc_err_sever_or;
u32 sec_unc_err_mask_and;
u32 sec_unc_err_mask_or;
};
static void program_hpx_type2(struct pci_dev *dev, struct hpx_type2 *hpx)
{
int pos;
u32 reg32;
if (!hpx)
return;
if (!pci_is_pcie(dev))
return;
if (hpx->revision > 1) {
pci_warn(dev, "PCIe settings rev %d not supported\n",
hpx->revision);
return;
}
/*
* Don't allow _HPX to change MPS or MRRS settings. We manage
* those to make sure they're consistent with the rest of the
* platform.
*/
hpx->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD |
PCI_EXP_DEVCTL_READRQ;
hpx->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD |
PCI_EXP_DEVCTL_READRQ);
/* Initialize Device Control Register */
pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL,
~hpx->pci_exp_devctl_and, hpx->pci_exp_devctl_or);
/* Initialize Link Control Register */
if (pcie_cap_has_lnkctl(dev)) {
/*
* If the Root Port supports Read Completion Boundary of
* 128, set RCB to 128. Otherwise, clear it.
*/
hpx->pci_exp_lnkctl_and |= PCI_EXP_LNKCTL_RCB;
hpx->pci_exp_lnkctl_or &= ~PCI_EXP_LNKCTL_RCB;
if (pcie_root_rcb_set(dev))
hpx->pci_exp_lnkctl_or |= PCI_EXP_LNKCTL_RCB;
pcie_capability_clear_and_set_word(dev, PCI_EXP_LNKCTL,
~hpx->pci_exp_lnkctl_and, hpx->pci_exp_lnkctl_or);
}
/* Find Advanced Error Reporting Enhanced Capability */
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
if (!pos)
return;
/* Initialize Uncorrectable Error Mask Register */
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, ®32);
reg32 = (reg32 & hpx->unc_err_mask_and) | hpx->unc_err_mask_or;
pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, reg32);
/* Initialize Uncorrectable Error Severity Register */
pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, ®32);
reg32 = (reg32 & hpx->unc_err_sever_and) | hpx->unc_err_sever_or;
pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, reg32);
/* Initialize Correctable Error Mask Register */
pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, ®32);
reg32 = (reg32 & hpx->cor_err_mask_and) | hpx->cor_err_mask_or;
pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, reg32);
/* Initialize Advanced Error Capabilities and Control Register */
pci_read_config_dword(dev, pos + PCI_ERR_CAP, ®32);
reg32 = (reg32 & hpx->adv_err_cap_and) | hpx->adv_err_cap_or;
/* Don't enable ECRC generation or checking if unsupported */
if (!(reg32 & PCI_ERR_CAP_ECRC_GENC))
reg32 &= ~PCI_ERR_CAP_ECRC_GENE;
if (!(reg32 & PCI_ERR_CAP_ECRC_CHKC))
reg32 &= ~PCI_ERR_CAP_ECRC_CHKE;
pci_write_config_dword(dev, pos + PCI_ERR_CAP, reg32);
/*
* FIXME: The following two registers are not supported yet.
*
* o Secondary Uncorrectable Error Severity Register
* o Secondary Uncorrectable Error Mask Register
*/
}
static acpi_status decode_type2_hpx_record(union acpi_object *record,
struct hpx_type2 *hpx2)
{
int i;
union acpi_object *fields = record->package.elements;
u32 revision = fields[1].integer.value;
switch (revision) {
case 1:
if (record->package.count != 18)
return AE_ERROR;
for (i = 2; i < 18; i++)
if (fields[i].type != ACPI_TYPE_INTEGER)
return AE_ERROR;
hpx2->revision = revision;
hpx2->unc_err_mask_and = fields[2].integer.value;
hpx2->unc_err_mask_or = fields[3].integer.value;
hpx2->unc_err_sever_and = fields[4].integer.value;
hpx2->unc_err_sever_or = fields[5].integer.value;
hpx2->cor_err_mask_and = fields[6].integer.value;
hpx2->cor_err_mask_or = fields[7].integer.value;
hpx2->adv_err_cap_and = fields[8].integer.value;
hpx2->adv_err_cap_or = fields[9].integer.value;
hpx2->pci_exp_devctl_and = fields[10].integer.value;
hpx2->pci_exp_devctl_or = fields[11].integer.value;
hpx2->pci_exp_lnkctl_and = fields[12].integer.value;
hpx2->pci_exp_lnkctl_or = fields[13].integer.value;
hpx2->sec_unc_err_sever_and = fields[14].integer.value;
hpx2->sec_unc_err_sever_or = fields[15].integer.value;
hpx2->sec_unc_err_mask_and = fields[16].integer.value;
hpx2->sec_unc_err_mask_or = fields[17].integer.value;
break;
default:
pr_warn("%s: Type 2 Revision %d record not supported\n",
__func__, revision);
return AE_ERROR;
}
return AE_OK;
}
/* _HPX PCI Express Setting Record (Type 3) */
struct hpx_type3 {
u16 device_type;
u16 function_type;
u16 config_space_location;
u16 pci_exp_cap_id;
u16 pci_exp_cap_ver;
u16 pci_exp_vendor_id;
u16 dvsec_id;
u16 dvsec_rev;
u16 match_offset;
u32 match_mask_and;
u32 match_value;
u16 reg_offset;
u32 reg_mask_and;
u32 reg_mask_or;
};
enum hpx_type3_dev_type {
HPX_TYPE_ENDPOINT = BIT(0),
HPX_TYPE_LEG_END = BIT(1),
HPX_TYPE_RC_END = BIT(2),
HPX_TYPE_RC_EC = BIT(3),
HPX_TYPE_ROOT_PORT = BIT(4),
HPX_TYPE_UPSTREAM = BIT(5),
HPX_TYPE_DOWNSTREAM = BIT(6),
HPX_TYPE_PCI_BRIDGE = BIT(7),
HPX_TYPE_PCIE_BRIDGE = BIT(8),
};
static u16 hpx3_device_type(struct pci_dev *dev)
{
u16 pcie_type = pci_pcie_type(dev);
static const int pcie_to_hpx3_type[] = {
[PCI_EXP_TYPE_ENDPOINT] = HPX_TYPE_ENDPOINT,
[PCI_EXP_TYPE_LEG_END] = HPX_TYPE_LEG_END,
[PCI_EXP_TYPE_RC_END] = HPX_TYPE_RC_END,
[PCI_EXP_TYPE_RC_EC] = HPX_TYPE_RC_EC,
[PCI_EXP_TYPE_ROOT_PORT] = HPX_TYPE_ROOT_PORT,
[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: /* Fall through */
case HPX_CFG_DVSEC: /* Fall through */
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
*/
static 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);
static bool acpi_pci_bridge_d3(struct pci_dev *dev)
{
const struct fwnode_handle *fwnode;
struct acpi_device *adev;
struct pci_dev *root;
u8 val;
if (!dev->is_hotplug_bridge)
return false;
/*
* Look for a special _DSD property for the root port and if it
* is set we know the hierarchy behind it supports D3 just fine.
*/
root = pcie_find_root_port(dev);
if (!root)
return false;
adev = ACPI_COMPANION(&root->dev);
if (root == dev) {
/*
* It is possible that the ACPI companion is not yet bound
* for the root port so look it up manually here.
*/
if (!adev && !pci_dev_is_added(root))
adev = acpi_pci_find_companion(&root->dev);
}
if (!adev)
return false;
fwnode = acpi_fwnode_handle(adev);
if (fwnode_property_read_u8(fwnode, "HotPlugSupportInD3", &val))
return false;
return val == 1;
}
static bool acpi_pci_power_manageable(struct pci_dev *dev)
{
struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
return adev ? acpi_device_power_manageable(adev) : false;
}
static 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) {