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1/*
2 * File: pci-acpi.c
3 * Purpose: Provide PCI support in ACPI
4 *
5 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
7 * Copyright (C) 2004 Intel Corp.
8 */
9
10#include <linux/delay.h>
11#include <linux/init.h>
12#include <linux/pci.h>
13#include <linux/module.h>
14#include <linux/pci-aspm.h>
15#include <acpi/acpi.h>
16#include <acpi/acpi_bus.h>
17
18#include <linux/pci-acpi.h>
19#include <linux/pm_runtime.h>
20#include "pci.h"
21
22static DEFINE_MUTEX(pci_acpi_pm_notify_mtx);
23
24/**
25 * pci_acpi_wake_bus - Wake-up notification handler for root buses.
26 * @handle: ACPI handle of a device the notification is for.
27 * @event: Type of the signaled event.
28 * @context: PCI root bus to wake up devices on.
29 */
30static void pci_acpi_wake_bus(acpi_handle handle, u32 event, void *context)
31{
32 struct pci_bus *pci_bus = context;
33
34 if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_bus)
35 pci_pme_wakeup_bus(pci_bus);
36}
37
38/**
39 * pci_acpi_wake_dev - Wake-up notification handler for PCI devices.
40 * @handle: ACPI handle of a device the notification is for.
41 * @event: Type of the signaled event.
42 * @context: PCI device object to wake up.
43 */
44static void pci_acpi_wake_dev(acpi_handle handle, u32 event, void *context)
45{
46 struct pci_dev *pci_dev = context;
47
48 if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev)
49 return;
50
51 if (!pci_dev->pm_cap || !pci_dev->pme_support
52 || pci_check_pme_status(pci_dev)) {
53 if (pci_dev->pme_poll)
54 pci_dev->pme_poll = false;
55
56 pci_wakeup_event(pci_dev);
57 pm_runtime_resume(&pci_dev->dev);
58 }
59
60 if (pci_dev->subordinate)
61 pci_pme_wakeup_bus(pci_dev->subordinate);
62}
63
64/**
65 * add_pm_notifier - Register PM notifier for given ACPI device.
66 * @dev: ACPI device to add the notifier for.
67 * @context: PCI device or bus to check for PME status if an event is signaled.
68 *
69 * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
70 * PM wake-up events. For example, wake-up events may be generated for bridges
71 * if one of the devices below the bridge is signaling PME, even if the bridge
72 * itself doesn't have a wake-up GPE associated with it.
73 */
74static acpi_status add_pm_notifier(struct acpi_device *dev,
75 acpi_notify_handler handler,
76 void *context)
77{
78 acpi_status status = AE_ALREADY_EXISTS;
79
80 mutex_lock(&pci_acpi_pm_notify_mtx);
81
82 if (dev->wakeup.flags.notifier_present)
83 goto out;
84
85 status = acpi_install_notify_handler(dev->handle,
86 ACPI_SYSTEM_NOTIFY,
87 handler, context);
88 if (ACPI_FAILURE(status))
89 goto out;
90
91 dev->wakeup.flags.notifier_present = true;
92
93 out:
94 mutex_unlock(&pci_acpi_pm_notify_mtx);
95 return status;
96}
97
98/**
99 * remove_pm_notifier - Unregister PM notifier from given ACPI device.
100 * @dev: ACPI device to remove the notifier from.
101 */
102static acpi_status remove_pm_notifier(struct acpi_device *dev,
103 acpi_notify_handler handler)
104{
105 acpi_status status = AE_BAD_PARAMETER;
106
107 mutex_lock(&pci_acpi_pm_notify_mtx);
108
109 if (!dev->wakeup.flags.notifier_present)
110 goto out;
111
112 status = acpi_remove_notify_handler(dev->handle,
113 ACPI_SYSTEM_NOTIFY,
114 handler);
115 if (ACPI_FAILURE(status))
116 goto out;
117
118 dev->wakeup.flags.notifier_present = false;
119
120 out:
121 mutex_unlock(&pci_acpi_pm_notify_mtx);
122 return status;
123}
124
125/**
126 * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
127 * @dev: ACPI device to add the notifier for.
128 * @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
129 */
130acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
131 struct pci_bus *pci_bus)
132{
133 return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
134}
135
136/**
137 * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
138 * @dev: ACPI device to remove the notifier from.
139 */
140acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
141{
142 return remove_pm_notifier(dev, pci_acpi_wake_bus);
143}
144
145/**
146 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
147 * @dev: ACPI device to add the notifier for.
148 * @pci_dev: PCI device to check for the PME status if an event is signaled.
149 */
150acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
151 struct pci_dev *pci_dev)
152{
153 return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
154}
155
156/**
157 * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
158 * @dev: ACPI device to remove the notifier from.
159 */
160acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
161{
162 return remove_pm_notifier(dev, pci_acpi_wake_dev);
163}
164
165/*
166 * _SxD returns the D-state with the highest power
167 * (lowest D-state number) supported in the S-state "x".
168 *
169 * If the devices does not have a _PRW
170 * (Power Resources for Wake) supporting system wakeup from "x"
171 * then the OS is free to choose a lower power (higher number
172 * D-state) than the return value from _SxD.
173 *
174 * But if _PRW is enabled at S-state "x", the OS
175 * must not choose a power lower than _SxD --
176 * unless the device has an _SxW method specifying
177 * the lowest power (highest D-state number) the device
178 * may enter while still able to wake the system.
179 *
180 * ie. depending on global OS policy:
181 *
182 * if (_PRW at S-state x)
183 * choose from highest power _SxD to lowest power _SxW
184 * else // no _PRW at S-state x
185 * choose highest power _SxD or any lower power
186 */
187
188static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
189{
190 int acpi_state;
191
192 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
193 if (acpi_state < 0)
194 return PCI_POWER_ERROR;
195
196 switch (acpi_state) {
197 case ACPI_STATE_D0:
198 return PCI_D0;
199 case ACPI_STATE_D1:
200 return PCI_D1;
201 case ACPI_STATE_D2:
202 return PCI_D2;
203 case ACPI_STATE_D3_HOT:
204 return PCI_D3hot;
205 case ACPI_STATE_D3_COLD:
206 return PCI_D3cold;
207 }
208 return PCI_POWER_ERROR;
209}
210
211static bool acpi_pci_power_manageable(struct pci_dev *dev)
212{
213 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
214
215 return handle ? acpi_bus_power_manageable(handle) : false;
216}
217
218static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
219{
220 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
221 acpi_handle tmp;
222 static const u8 state_conv[] = {
223 [PCI_D0] = ACPI_STATE_D0,
224 [PCI_D1] = ACPI_STATE_D1,
225 [PCI_D2] = ACPI_STATE_D2,
226 [PCI_D3hot] = ACPI_STATE_D3,
227 [PCI_D3cold] = ACPI_STATE_D3
228 };
229 int error = -EINVAL;
230
231 /* If the ACPI device has _EJ0, ignore the device */
232 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
233 return -ENODEV;
234
235 switch (state) {
236 case PCI_D0:
237 case PCI_D1:
238 case PCI_D2:
239 case PCI_D3hot:
240 case PCI_D3cold:
241 error = acpi_bus_set_power(handle, state_conv[state]);
242 }
243
244 if (!error)
245 dev_printk(KERN_INFO, &dev->dev,
246 "power state changed by ACPI to D%d\n", state);
247
248 return error;
249}
250
251static bool acpi_pci_can_wakeup(struct pci_dev *dev)
252{
253 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
254
255 return handle ? acpi_bus_can_wakeup(handle) : false;
256}
257
258static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
259{
260 while (bus->parent) {
261 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
262 return;
263 bus = bus->parent;
264 }
265
266 /* We have reached the root bus. */
267 if (bus->bridge)
268 acpi_pm_device_sleep_wake(bus->bridge, enable);
269}
270
271static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
272{
273 if (acpi_pci_can_wakeup(dev))
274 return acpi_pm_device_sleep_wake(&dev->dev, enable);
275
276 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
277 return 0;
278}
279
280static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
281{
282 while (bus->parent) {
283 struct pci_dev *bridge = bus->self;
284
285 if (bridge->pme_interrupt)
286 return;
287 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
288 return;
289 bus = bus->parent;
290 }
291
292 /* We have reached the root bus. */
293 if (bus->bridge)
294 acpi_pm_device_run_wake(bus->bridge, enable);
295}
296
297static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
298{
299 if (dev->pme_interrupt)
300 return 0;
301
302 if (!acpi_pm_device_run_wake(&dev->dev, enable))
303 return 0;
304
305 acpi_pci_propagate_run_wake(dev->bus, enable);
306 return 0;
307}
308
309static struct pci_platform_pm_ops acpi_pci_platform_pm = {
310 .is_manageable = acpi_pci_power_manageable,
311 .set_state = acpi_pci_set_power_state,
312 .choose_state = acpi_pci_choose_state,
313 .can_wakeup = acpi_pci_can_wakeup,
314 .sleep_wake = acpi_pci_sleep_wake,
315 .run_wake = acpi_pci_run_wake,
316};
317
318/* ACPI bus type */
319static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
320{
321 struct pci_dev * pci_dev;
322 u64 addr;
323
324 pci_dev = to_pci_dev(dev);
325 /* Please ref to ACPI spec for the syntax of _ADR */
326 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
327 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
328 if (!*handle)
329 return -ENODEV;
330 return 0;
331}
332
333static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
334{
335 int num;
336 unsigned int seg, bus;
337
338 /*
339 * The string should be the same as root bridge's name
340 * Please look at 'pci_scan_bus_parented'
341 */
342 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
343 if (num != 2)
344 return -ENODEV;
345 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
346 if (!*handle)
347 return -ENODEV;
348 return 0;
349}
350
351static struct acpi_bus_type acpi_pci_bus = {
352 .bus = &pci_bus_type,
353 .find_device = acpi_pci_find_device,
354 .find_bridge = acpi_pci_find_root_bridge,
355};
356
357static int __init acpi_pci_init(void)
358{
359 int ret;
360
361 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
362 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
363 pci_no_msi();
364 }
365
366 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
367 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
368 pcie_no_aspm();
369 }
370
371 ret = register_acpi_bus_type(&acpi_pci_bus);
372 if (ret)
373 return 0;
374 pci_set_platform_pm(&acpi_pci_platform_pm);
375 return 0;
376}
377arch_initcall(acpi_pci_init);
1/*
2 * File: pci-acpi.c
3 * Purpose: Provide PCI support in ACPI
4 *
5 * Copyright (C) 2005 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (C) 2004 Tom Long Nguyen <tom.l.nguyen@intel.com>
7 * Copyright (C) 2004 Intel Corp.
8 */
9
10#include <linux/delay.h>
11#include <linux/init.h>
12#include <linux/irqdomain.h>
13#include <linux/pci.h>
14#include <linux/msi.h>
15#include <linux/pci_hotplug.h>
16#include <linux/module.h>
17#include <linux/pci-aspm.h>
18#include <linux/pci-acpi.h>
19#include <linux/pm_runtime.h>
20#include <linux/pm_qos.h>
21#include "pci.h"
22
23/*
24 * The UUID is defined in the PCI Firmware Specification available here:
25 * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
26 */
27const u8 pci_acpi_dsm_uuid[] = {
28 0xd0, 0x37, 0xc9, 0xe5, 0x53, 0x35, 0x7a, 0x4d,
29 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d
30};
31
32phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
33{
34 acpi_status status = AE_NOT_EXIST;
35 unsigned long long mcfg_addr;
36
37 if (handle)
38 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
39 NULL, &mcfg_addr);
40 if (ACPI_FAILURE(status))
41 return 0;
42
43 return (phys_addr_t)mcfg_addr;
44}
45
46static acpi_status decode_type0_hpx_record(union acpi_object *record,
47 struct hotplug_params *hpx)
48{
49 int i;
50 union acpi_object *fields = record->package.elements;
51 u32 revision = fields[1].integer.value;
52
53 switch (revision) {
54 case 1:
55 if (record->package.count != 6)
56 return AE_ERROR;
57 for (i = 2; i < 6; i++)
58 if (fields[i].type != ACPI_TYPE_INTEGER)
59 return AE_ERROR;
60 hpx->t0 = &hpx->type0_data;
61 hpx->t0->revision = revision;
62 hpx->t0->cache_line_size = fields[2].integer.value;
63 hpx->t0->latency_timer = fields[3].integer.value;
64 hpx->t0->enable_serr = fields[4].integer.value;
65 hpx->t0->enable_perr = fields[5].integer.value;
66 break;
67 default:
68 printk(KERN_WARNING
69 "%s: Type 0 Revision %d record not supported\n",
70 __func__, revision);
71 return AE_ERROR;
72 }
73 return AE_OK;
74}
75
76static acpi_status decode_type1_hpx_record(union acpi_object *record,
77 struct hotplug_params *hpx)
78{
79 int i;
80 union acpi_object *fields = record->package.elements;
81 u32 revision = fields[1].integer.value;
82
83 switch (revision) {
84 case 1:
85 if (record->package.count != 5)
86 return AE_ERROR;
87 for (i = 2; i < 5; i++)
88 if (fields[i].type != ACPI_TYPE_INTEGER)
89 return AE_ERROR;
90 hpx->t1 = &hpx->type1_data;
91 hpx->t1->revision = revision;
92 hpx->t1->max_mem_read = fields[2].integer.value;
93 hpx->t1->avg_max_split = fields[3].integer.value;
94 hpx->t1->tot_max_split = fields[4].integer.value;
95 break;
96 default:
97 printk(KERN_WARNING
98 "%s: Type 1 Revision %d record not supported\n",
99 __func__, revision);
100 return AE_ERROR;
101 }
102 return AE_OK;
103}
104
105static acpi_status decode_type2_hpx_record(union acpi_object *record,
106 struct hotplug_params *hpx)
107{
108 int i;
109 union acpi_object *fields = record->package.elements;
110 u32 revision = fields[1].integer.value;
111
112 switch (revision) {
113 case 1:
114 if (record->package.count != 18)
115 return AE_ERROR;
116 for (i = 2; i < 18; i++)
117 if (fields[i].type != ACPI_TYPE_INTEGER)
118 return AE_ERROR;
119 hpx->t2 = &hpx->type2_data;
120 hpx->t2->revision = revision;
121 hpx->t2->unc_err_mask_and = fields[2].integer.value;
122 hpx->t2->unc_err_mask_or = fields[3].integer.value;
123 hpx->t2->unc_err_sever_and = fields[4].integer.value;
124 hpx->t2->unc_err_sever_or = fields[5].integer.value;
125 hpx->t2->cor_err_mask_and = fields[6].integer.value;
126 hpx->t2->cor_err_mask_or = fields[7].integer.value;
127 hpx->t2->adv_err_cap_and = fields[8].integer.value;
128 hpx->t2->adv_err_cap_or = fields[9].integer.value;
129 hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
130 hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
131 hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
132 hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
133 hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
134 hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
135 hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
136 hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
137 break;
138 default:
139 printk(KERN_WARNING
140 "%s: Type 2 Revision %d record not supported\n",
141 __func__, revision);
142 return AE_ERROR;
143 }
144 return AE_OK;
145}
146
147static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
148{
149 acpi_status status;
150 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
151 union acpi_object *package, *record, *fields;
152 u32 type;
153 int i;
154
155 /* Clear the return buffer with zeros */
156 memset(hpx, 0, sizeof(struct hotplug_params));
157
158 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
159 if (ACPI_FAILURE(status))
160 return status;
161
162 package = (union acpi_object *)buffer.pointer;
163 if (package->type != ACPI_TYPE_PACKAGE) {
164 status = AE_ERROR;
165 goto exit;
166 }
167
168 for (i = 0; i < package->package.count; i++) {
169 record = &package->package.elements[i];
170 if (record->type != ACPI_TYPE_PACKAGE) {
171 status = AE_ERROR;
172 goto exit;
173 }
174
175 fields = record->package.elements;
176 if (fields[0].type != ACPI_TYPE_INTEGER ||
177 fields[1].type != ACPI_TYPE_INTEGER) {
178 status = AE_ERROR;
179 goto exit;
180 }
181
182 type = fields[0].integer.value;
183 switch (type) {
184 case 0:
185 status = decode_type0_hpx_record(record, hpx);
186 if (ACPI_FAILURE(status))
187 goto exit;
188 break;
189 case 1:
190 status = decode_type1_hpx_record(record, hpx);
191 if (ACPI_FAILURE(status))
192 goto exit;
193 break;
194 case 2:
195 status = decode_type2_hpx_record(record, hpx);
196 if (ACPI_FAILURE(status))
197 goto exit;
198 break;
199 default:
200 printk(KERN_ERR "%s: Type %d record not supported\n",
201 __func__, type);
202 status = AE_ERROR;
203 goto exit;
204 }
205 }
206 exit:
207 kfree(buffer.pointer);
208 return status;
209}
210
211static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
212{
213 acpi_status status;
214 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
215 union acpi_object *package, *fields;
216 int i;
217
218 memset(hpp, 0, sizeof(struct hotplug_params));
219
220 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
221 if (ACPI_FAILURE(status))
222 return status;
223
224 package = (union acpi_object *) buffer.pointer;
225 if (package->type != ACPI_TYPE_PACKAGE ||
226 package->package.count != 4) {
227 status = AE_ERROR;
228 goto exit;
229 }
230
231 fields = package->package.elements;
232 for (i = 0; i < 4; i++) {
233 if (fields[i].type != ACPI_TYPE_INTEGER) {
234 status = AE_ERROR;
235 goto exit;
236 }
237 }
238
239 hpp->t0 = &hpp->type0_data;
240 hpp->t0->revision = 1;
241 hpp->t0->cache_line_size = fields[0].integer.value;
242 hpp->t0->latency_timer = fields[1].integer.value;
243 hpp->t0->enable_serr = fields[2].integer.value;
244 hpp->t0->enable_perr = fields[3].integer.value;
245
246exit:
247 kfree(buffer.pointer);
248 return status;
249}
250
251/* pci_get_hp_params
252 *
253 * @dev - the pci_dev for which we want parameters
254 * @hpp - allocated by the caller
255 */
256int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
257{
258 acpi_status status;
259 acpi_handle handle, phandle;
260 struct pci_bus *pbus;
261
262 if (acpi_pci_disabled)
263 return -ENODEV;
264
265 handle = NULL;
266 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
267 handle = acpi_pci_get_bridge_handle(pbus);
268 if (handle)
269 break;
270 }
271
272 /*
273 * _HPP settings apply to all child buses, until another _HPP is
274 * encountered. If we don't find an _HPP for the input pci dev,
275 * look for it in the parent device scope since that would apply to
276 * this pci dev.
277 */
278 while (handle) {
279 status = acpi_run_hpx(handle, hpp);
280 if (ACPI_SUCCESS(status))
281 return 0;
282 status = acpi_run_hpp(handle, hpp);
283 if (ACPI_SUCCESS(status))
284 return 0;
285 if (acpi_is_root_bridge(handle))
286 break;
287 status = acpi_get_parent(handle, &phandle);
288 if (ACPI_FAILURE(status))
289 break;
290 handle = phandle;
291 }
292 return -ENODEV;
293}
294EXPORT_SYMBOL_GPL(pci_get_hp_params);
295
296/**
297 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
298 * @work: Work item to handle.
299 */
300static void pci_acpi_wake_bus(struct work_struct *work)
301{
302 struct acpi_device *adev;
303 struct acpi_pci_root *root;
304
305 adev = container_of(work, struct acpi_device, wakeup.context.work);
306 root = acpi_driver_data(adev);
307 pci_pme_wakeup_bus(root->bus);
308}
309
310/**
311 * pci_acpi_wake_dev - PCI device wakeup notification work function.
312 * @handle: ACPI handle of a device the notification is for.
313 * @work: Work item to handle.
314 */
315static void pci_acpi_wake_dev(struct work_struct *work)
316{
317 struct acpi_device_wakeup_context *context;
318 struct pci_dev *pci_dev;
319
320 context = container_of(work, struct acpi_device_wakeup_context, work);
321 pci_dev = to_pci_dev(context->dev);
322
323 if (pci_dev->pme_poll)
324 pci_dev->pme_poll = false;
325
326 if (pci_dev->current_state == PCI_D3cold) {
327 pci_wakeup_event(pci_dev);
328 pm_runtime_resume(&pci_dev->dev);
329 return;
330 }
331
332 /* Clear PME Status if set. */
333 if (pci_dev->pme_support)
334 pci_check_pme_status(pci_dev);
335
336 pci_wakeup_event(pci_dev);
337 pm_runtime_resume(&pci_dev->dev);
338
339 pci_pme_wakeup_bus(pci_dev->subordinate);
340}
341
342/**
343 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
344 * @dev: PCI root bridge ACPI device.
345 */
346acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
347{
348 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
349}
350
351/**
352 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
353 * @dev: ACPI device to add the notifier for.
354 * @pci_dev: PCI device to check for the PME status if an event is signaled.
355 */
356acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
357 struct pci_dev *pci_dev)
358{
359 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
360}
361
362/*
363 * _SxD returns the D-state with the highest power
364 * (lowest D-state number) supported in the S-state "x".
365 *
366 * If the devices does not have a _PRW
367 * (Power Resources for Wake) supporting system wakeup from "x"
368 * then the OS is free to choose a lower power (higher number
369 * D-state) than the return value from _SxD.
370 *
371 * But if _PRW is enabled at S-state "x", the OS
372 * must not choose a power lower than _SxD --
373 * unless the device has an _SxW method specifying
374 * the lowest power (highest D-state number) the device
375 * may enter while still able to wake the system.
376 *
377 * ie. depending on global OS policy:
378 *
379 * if (_PRW at S-state x)
380 * choose from highest power _SxD to lowest power _SxW
381 * else // no _PRW at S-state x
382 * choose highest power _SxD or any lower power
383 */
384
385static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
386{
387 int acpi_state, d_max;
388
389 if (pdev->no_d3cold)
390 d_max = ACPI_STATE_D3_HOT;
391 else
392 d_max = ACPI_STATE_D3_COLD;
393 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
394 if (acpi_state < 0)
395 return PCI_POWER_ERROR;
396
397 switch (acpi_state) {
398 case ACPI_STATE_D0:
399 return PCI_D0;
400 case ACPI_STATE_D1:
401 return PCI_D1;
402 case ACPI_STATE_D2:
403 return PCI_D2;
404 case ACPI_STATE_D3_HOT:
405 return PCI_D3hot;
406 case ACPI_STATE_D3_COLD:
407 return PCI_D3cold;
408 }
409 return PCI_POWER_ERROR;
410}
411
412static bool acpi_pci_power_manageable(struct pci_dev *dev)
413{
414 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
415 return adev ? acpi_device_power_manageable(adev) : false;
416}
417
418static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
419{
420 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
421 static const u8 state_conv[] = {
422 [PCI_D0] = ACPI_STATE_D0,
423 [PCI_D1] = ACPI_STATE_D1,
424 [PCI_D2] = ACPI_STATE_D2,
425 [PCI_D3hot] = ACPI_STATE_D3_HOT,
426 [PCI_D3cold] = ACPI_STATE_D3_COLD,
427 };
428 int error = -EINVAL;
429
430 /* If the ACPI device has _EJ0, ignore the device */
431 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
432 return -ENODEV;
433
434 switch (state) {
435 case PCI_D3cold:
436 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
437 PM_QOS_FLAGS_ALL) {
438 error = -EBUSY;
439 break;
440 }
441 case PCI_D0:
442 case PCI_D1:
443 case PCI_D2:
444 case PCI_D3hot:
445 error = acpi_device_set_power(adev, state_conv[state]);
446 }
447
448 if (!error)
449 dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
450 acpi_power_state_string(state_conv[state]));
451
452 return error;
453}
454
455static bool acpi_pci_can_wakeup(struct pci_dev *dev)
456{
457 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
458 return adev ? acpi_device_can_wakeup(adev) : false;
459}
460
461static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
462{
463 while (bus->parent) {
464 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
465 return;
466 bus = bus->parent;
467 }
468
469 /* We have reached the root bus. */
470 if (bus->bridge)
471 acpi_pm_device_sleep_wake(bus->bridge, enable);
472}
473
474static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
475{
476 if (acpi_pci_can_wakeup(dev))
477 return acpi_pm_device_sleep_wake(&dev->dev, enable);
478
479 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
480 return 0;
481}
482
483static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
484{
485 while (bus->parent) {
486 struct pci_dev *bridge = bus->self;
487
488 if (bridge->pme_interrupt)
489 return;
490 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
491 return;
492 bus = bus->parent;
493 }
494
495 /* We have reached the root bus. */
496 if (bus->bridge)
497 acpi_pm_device_run_wake(bus->bridge, enable);
498}
499
500static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
501{
502 /*
503 * Per PCI Express Base Specification Revision 2.0 section
504 * 5.3.3.2 Link Wakeup, platform support is needed for D3cold
505 * waking up to power on the main link even if there is PME
506 * support for D3cold
507 */
508 if (dev->pme_interrupt && !dev->runtime_d3cold)
509 return 0;
510
511 if (!acpi_pm_device_run_wake(&dev->dev, enable))
512 return 0;
513
514 acpi_pci_propagate_run_wake(dev->bus, enable);
515 return 0;
516}
517
518static bool acpi_pci_need_resume(struct pci_dev *dev)
519{
520 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
521
522 if (!adev || !acpi_device_power_manageable(adev))
523 return false;
524
525 if (device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
526 return true;
527
528 if (acpi_target_system_state() == ACPI_STATE_S0)
529 return false;
530
531 return !!adev->power.flags.dsw_present;
532}
533
534static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
535 .is_manageable = acpi_pci_power_manageable,
536 .set_state = acpi_pci_set_power_state,
537 .choose_state = acpi_pci_choose_state,
538 .sleep_wake = acpi_pci_sleep_wake,
539 .run_wake = acpi_pci_run_wake,
540 .need_resume = acpi_pci_need_resume,
541};
542
543void acpi_pci_add_bus(struct pci_bus *bus)
544{
545 union acpi_object *obj;
546 struct pci_host_bridge *bridge;
547
548 if (acpi_pci_disabled || !bus->bridge)
549 return;
550
551 acpi_pci_slot_enumerate(bus);
552 acpiphp_enumerate_slots(bus);
553
554 /*
555 * For a host bridge, check its _DSM for function 8 and if
556 * that is available, mark it in pci_host_bridge.
557 */
558 if (!pci_is_root_bus(bus))
559 return;
560
561 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), pci_acpi_dsm_uuid, 3,
562 RESET_DELAY_DSM, NULL);
563 if (!obj)
564 return;
565
566 if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
567 bridge = pci_find_host_bridge(bus);
568 bridge->ignore_reset_delay = 1;
569 }
570 ACPI_FREE(obj);
571}
572
573void acpi_pci_remove_bus(struct pci_bus *bus)
574{
575 if (acpi_pci_disabled || !bus->bridge)
576 return;
577
578 acpiphp_remove_slots(bus);
579 acpi_pci_slot_remove(bus);
580}
581
582/* ACPI bus type */
583static struct acpi_device *acpi_pci_find_companion(struct device *dev)
584{
585 struct pci_dev *pci_dev = to_pci_dev(dev);
586 bool check_children;
587 u64 addr;
588
589 check_children = pci_is_bridge(pci_dev);
590 /* Please ref to ACPI spec for the syntax of _ADR */
591 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
592 return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
593 check_children);
594}
595
596/**
597 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
598 * @pdev: the PCI device whose delay is to be updated
599 * @handle: ACPI handle of this device
600 *
601 * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
602 * control method of either the device itself or the PCI host bridge.
603 *
604 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
605 * host bridge. If it returns one, the OS may assume that all devices in
606 * the hierarchy have already completed power-on reset delays.
607 *
608 * Function 9, "Device Readiness Durations," applies only to the object
609 * where it is located. It returns delay durations required after various
610 * events if the device requires less time than the spec requires. Delays
611 * from this function take precedence over the Reset Delay function.
612 *
613 * These _DSM functions are defined by the draft ECN of January 28, 2014,
614 * titled "ACPI additions for FW latency optimizations."
615 */
616static void pci_acpi_optimize_delay(struct pci_dev *pdev,
617 acpi_handle handle)
618{
619 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
620 int value;
621 union acpi_object *obj, *elements;
622
623 if (bridge->ignore_reset_delay)
624 pdev->d3cold_delay = 0;
625
626 obj = acpi_evaluate_dsm(handle, pci_acpi_dsm_uuid, 3,
627 FUNCTION_DELAY_DSM, NULL);
628 if (!obj)
629 return;
630
631 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
632 elements = obj->package.elements;
633 if (elements[0].type == ACPI_TYPE_INTEGER) {
634 value = (int)elements[0].integer.value / 1000;
635 if (value < PCI_PM_D3COLD_WAIT)
636 pdev->d3cold_delay = value;
637 }
638 if (elements[3].type == ACPI_TYPE_INTEGER) {
639 value = (int)elements[3].integer.value / 1000;
640 if (value < PCI_PM_D3_WAIT)
641 pdev->d3_delay = value;
642 }
643 }
644 ACPI_FREE(obj);
645}
646
647static void pci_acpi_setup(struct device *dev)
648{
649 struct pci_dev *pci_dev = to_pci_dev(dev);
650 struct acpi_device *adev = ACPI_COMPANION(dev);
651
652 if (!adev)
653 return;
654
655 pci_acpi_optimize_delay(pci_dev, adev->handle);
656
657 pci_acpi_add_pm_notifier(adev, pci_dev);
658 if (!adev->wakeup.flags.valid)
659 return;
660
661 device_set_wakeup_capable(dev, true);
662 acpi_pci_sleep_wake(pci_dev, false);
663 if (adev->wakeup.flags.run_wake)
664 device_set_run_wake(dev, true);
665}
666
667static void pci_acpi_cleanup(struct device *dev)
668{
669 struct acpi_device *adev = ACPI_COMPANION(dev);
670
671 if (!adev)
672 return;
673
674 pci_acpi_remove_pm_notifier(adev);
675 if (adev->wakeup.flags.valid) {
676 device_set_wakeup_capable(dev, false);
677 device_set_run_wake(dev, false);
678 }
679}
680
681static bool pci_acpi_bus_match(struct device *dev)
682{
683 return dev_is_pci(dev);
684}
685
686static struct acpi_bus_type acpi_pci_bus = {
687 .name = "PCI",
688 .match = pci_acpi_bus_match,
689 .find_companion = acpi_pci_find_companion,
690 .setup = pci_acpi_setup,
691 .cleanup = pci_acpi_cleanup,
692};
693
694
695static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
696
697/**
698 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
699 * @fn: Callback matching a device to a fwnode that identifies a PCI
700 * MSI domain.
701 *
702 * This should be called by irqchip driver, which is the parent of
703 * the MSI domain to provide callback interface to query fwnode.
704 */
705void
706pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
707{
708 pci_msi_get_fwnode_cb = fn;
709}
710
711/**
712 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
713 * @bus: The PCI host bridge bus.
714 *
715 * This function uses the callback function registered by
716 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
717 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
718 * This returns NULL on error or when the domain is not found.
719 */
720struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
721{
722 struct fwnode_handle *fwnode;
723
724 if (!pci_msi_get_fwnode_cb)
725 return NULL;
726
727 fwnode = pci_msi_get_fwnode_cb(&bus->dev);
728 if (!fwnode)
729 return NULL;
730
731 return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
732}
733
734static int __init acpi_pci_init(void)
735{
736 int ret;
737
738 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
739 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
740 pci_no_msi();
741 }
742
743 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
744 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
745 pcie_no_aspm();
746 }
747
748 ret = register_acpi_bus_type(&acpi_pci_bus);
749 if (ret)
750 return 0;
751
752 pci_set_platform_pm(&acpi_pci_platform_pm);
753 acpi_pci_slot_init();
754 acpiphp_init();
755
756 return 0;
757}
758arch_initcall(acpi_pci_init);