// SPDX-License-Identifier: GPL-2.0
/*
* PCI support in ACPI
*
* Copyright ( C ) 2005 David Shaohua Li < shaohua . li @ intel . com >
* Copyright ( C ) 2004 Tom Long Nguyen < tom . l . nguyen @ intel . com >
* 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/pci-ecam.h>
#include <linux/pm_runtime.h>
#include <linux/pm_qos.h>
#include <linux/rwsem.h>
#include "pci.h"
/*
* The GUID is defined in the PCI Firmware Specification available
* here to PCI - SIG members :
* https : //members.pcisig.com/wg/PCI-SIG/document/15350
*/
const guid_t pci_acpi_dsm_guid =
GUID_INIT(0 xe5c937d0, 0 x3553, 0 x4d7a,
0 x91, 0 x17, 0 xea, 0 x4d, 0 x19, 0 xc3, 0 x43, 0 x4d);
#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, METHOD_NAME__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;
}
adev = acpi_fetch_acpi_dev(handle);
if (!adev)
return -ENODEV;
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;
}
bool pci_acpi_preserve_config(struct pci_host_bridge *host_bridge)
{
bool ret = false ;
if (ACPI_HANDLE(&host_bridge->dev)) {
union acpi_object *obj;
/*
* Evaluate the " PCI Boot Configuration " _ DSM Function . If it
* exists and returns 0 , we must preserve any PCI resource
* assignments made by firmware for this host bridge .
*/
obj = acpi_evaluate_dsm_typed(ACPI_HANDLE(&host_bridge->dev),
&pci_acpi_dsm_guid,
1 , DSM_PCI_PRESERVE_BOOT_CONFIG,
NULL, ACPI_TYPE_INTEGER);
if (obj && obj->integer.value == 0 )
ret = true ;
ACPI_FREE(obj);
}
return ret;
}
/* _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 = 0 x40,
.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 & 0 xf;
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;
if (!IS_ENABLED(CONFIG_HOTPLUG_PCI_PCIE))
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 || !pdev->d3cold_allowed)
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)
{
struct pci_dev *rpdev;
struct acpi_device *adev, *rpadev;
const union acpi_object *obj;
if (acpi_pci_disabled || !dev->is_pciehp)
return false ;
adev = ACPI_COMPANION(&dev->dev);
if (adev) {
/*
* If the bridge has _ S0W , whether or not it can go into D3
* depends on what is returned by that object . In particular ,
* if the power state returned by _ S0W is D2 or shallower ,
* entering D3 should not be allowed .
*/
if (acpi_dev_power_state_for_wake(adev) <= ACPI_STATE_D2)
return false ;
/*
* Otherwise , assume that the bridge can enter D3 so long as it
* is power - manageable via ACPI .
*/
if (acpi_device_power_manageable(adev))
return true ;
}
rpdev = pcie_find_root_port(dev);
if (!rpdev)
return false ;
if (rpdev == dev)
rpadev = adev;
else
rpadev = ACPI_COMPANION(&rpdev->dev);
if (!rpadev)
return false ;
/*
* If the Root Port cannot signal wakeup signals at all , i . e . , it
* doesn ' t supply a wakeup GPE via _ PRW , it cannot signal hotplug
* events from low - power states including D3hot and D3cold .
*/
if (!rpadev->wakeup.flags.valid)
return false ;
/*
* In the bridge - below - a - Root - Port case , evaluate _ S0W for the Root Port
* to verify whether or not it can signal wakeup from D3 .
*/
if (rpadev != adev &&
acpi_dev_power_state_for_wake(rpadev) <= ACPI_STATE_D2)
return false ;
/*
* The " HotPlugSupportInD3 " property in a Root Port _ DSD indicates
* the Port can signal hotplug events while in D3 . We assume any
* bridges * below * that Root Port can also signal hotplug events
* while in D3 .
*/
if (!acpi_dev_get_property(rpadev, "HotPlugSupportInD3" ,
ACPI_TYPE_INTEGER, &obj) &&
obj->integer.value == 1 )
return true ;
return false ;
}
static void acpi_pci_config_space_access(struct pci_dev *dev, bool enable)
{
int val = enable ? ACPI_REG_CONNECT : ACPI_REG_DISCONNECT;
int ret = acpi_evaluate_reg(ACPI_HANDLE(&dev->dev),
ACPI_ADR_SPACE_PCI_CONFIG, val);
if (ret)
pci_dbg(dev, "ACPI _REG %s evaluation failed (%d)\n" ,
enable ? "connect" : "disconnect" , ret);
}
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;
/* If the ACPI device has _EJ0, ignore the device */
if (!adev || acpi_has_method(adev->handle, "_EJ0" ))
return -ENODEV;
switch (state) {
case PCI_D0:
case PCI_D1:
case PCI_D2:
case PCI_D3hot:
case PCI_D3cold:
break ;
default :
return -EINVAL;
}
if (state == PCI_D3cold) {
if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
PM_QOS_FLAGS_ALL)
return -EBUSY;
/* Notify AML lack of PCI config space availability */
acpi_pci_config_space_access(dev, false );
}
error = acpi_device_set_power(adev, state_conv[state]);
if (error)
return error;
pci_dbg(dev, "power state changed by ACPI to %s\n" ,
acpi_power_state_string(adev->power.state));
/*
* Notify AML of PCI config space availability . Config space is
* accessible in all states except D3cold ; the only transitions
* that change availability are transitions to D3cold and from
* D3cold to D0 .
*/
if (state == PCI_D0)
acpi_pci_config_space_access(dev, true );
return 0 ;
}
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 305 V4A ) 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_typed(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 3 ,
DSM_PCI_POWER_ON_RESET_DELAY, NULL, ACPI_TYPE_INTEGER);
if (!obj)
return ;
if (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_typed(handle, &pci_acpi_dsm_guid, 3 ,
DSM_PCI_DEVICE_READINESS_DURATIONS, NULL,
ACPI_TYPE_PACKAGE);
if (!obj)
return ;
if (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);
if (pci_is_bridge(pci_dev))
acpi_dev_power_up_children_with_adr(adev);
}
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);
#if defined (CONFIG_ARM64) || defined (CONFIG_RISCV)
/*
* Try to assign the IRQ number when probing a new device
*/
int pcibios_alloc_irq(struct pci_dev *dev)
{
if (!acpi_disabled)
acpi_pci_irq_enable(dev);
return 0 ;
}
struct acpi_pci_generic_root_info {
struct acpi_pci_root_info common;
struct pci_config_window *cfg; /* config space mapping */
};
int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
{
struct pci_config_window *cfg = bus->sysdata;
struct acpi_device *adev = to_acpi_device(cfg->parent);
struct acpi_pci_root *root = acpi_driver_data(adev);
return root->segment;
}
int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
{
struct pci_config_window *cfg;
struct acpi_device *adev;
struct device *bus_dev;
if (acpi_disabled)
return 0 ;
cfg = bridge->bus->sysdata;
/*
* On Hyper - V there is no corresponding ACPI device for a root bridge ,
* therefore - > parent is set as NULL by the driver . And set ' adev ' as
* NULL in this case because there is no proper ACPI device .
*/
if (!cfg->parent)
adev = NULL;
else
adev = to_acpi_device(cfg->parent);
bus_dev = &bridge->bus->dev;
ACPI_COMPANION_SET(&bridge->dev, adev);
set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
return 0 ;
}
static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
{
struct resource_entry *entry, *tmp;
int status;
status = acpi_pci_probe_root_resources(ci);
resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
if (!(entry->res->flags & IORESOURCE_WINDOW))
resource_list_destroy_entry(entry);
}
return status;
}
/*
* Lookup the bus range for the domain in MCFG , and set up config space
* mapping .
*/
static struct pci_config_window *
pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
{
struct device *dev = &root->device->dev;
struct resource *bus_res = &root->secondary;
u16 seg = root->segment;
const struct pci_ecam_ops *ecam_ops;
struct resource cfgres;
struct acpi_device *adev;
struct pci_config_window *cfg;
int ret;
ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
if (ret) {
dev_err(dev, "%04x:%pR ECAM region not found\n" , seg, bus_res);
return NULL;
}
adev = acpi_resource_consumer(&cfgres);
if (adev)
dev_info(dev, "ECAM area %pR reserved by %s\n" , &cfgres,
dev_name(&adev->dev));
else
dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n" ,
&cfgres);
cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
if (IS_ERR(cfg)) {
dev_err(dev, "%04x:%pR error %ld mapping ECAM\n" , seg, bus_res,
PTR_ERR(cfg));
return NULL;
}
return cfg;
}
/* release_info: free resources allocated by init_info */
static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
{
struct acpi_pci_generic_root_info *ri;
ri = container_of(ci, struct acpi_pci_generic_root_info, common);
pci_ecam_free(ri->cfg);
kfree(ci->ops);
kfree(ri);
}
/* Interface called from ACPI code to setup PCI host controller */
struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
{
struct acpi_pci_generic_root_info *ri;
struct pci_bus *bus, *child;
struct acpi_pci_root_ops *root_ops;
struct pci_host_bridge *host;
ri = kzalloc(sizeof (*ri), GFP_KERNEL);
if (!ri)
return NULL;
root_ops = kzalloc(sizeof (*root_ops), GFP_KERNEL);
if (!root_ops) {
kfree(ri);
return NULL;
}
ri->cfg = pci_acpi_setup_ecam_mapping(root);
if (!ri->cfg) {
kfree(ri);
kfree(root_ops);
return NULL;
}
root_ops->release_info = pci_acpi_generic_release_info;
root_ops->prepare_resources = pci_acpi_root_prepare_resources;
root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
if (!bus)
return NULL;
/* If we must preserve the resource configuration, claim now */
host = pci_find_host_bridge(bus);
if (host->preserve_config)
pci_bus_claim_resources(bus);
/*
* Assign whatever was left unassigned . If we didn ' t claim above ,
* this will reassign everything .
*/
pci_assign_unassigned_root_bus_resources(bus);
list_for_each_entry(child, &bus->children, node)
pcie_bus_configure_settings(child);
return bus;
}
void pcibios_add_bus(struct pci_bus *bus)
{
acpi_pci_add_bus(bus);
}
void pcibios_remove_bus(struct pci_bus *bus)
{
acpi_pci_remove_bus(bus);
}
#endif
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