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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 pci_wakeup_event(pci_dev);
50 pci_check_pme_status(pci_dev);
51 pm_runtime_resume(&pci_dev->dev);
52 if (pci_dev->subordinate)
53 pci_pme_wakeup_bus(pci_dev->subordinate);
54 }
55}
56
57/**
58 * add_pm_notifier - Register PM notifier for given ACPI device.
59 * @dev: ACPI device to add the notifier for.
60 * @context: PCI device or bus to check for PME status if an event is signaled.
61 *
62 * NOTE: @dev need not be a run-wake or wake-up device to be a valid source of
63 * PM wake-up events. For example, wake-up events may be generated for bridges
64 * if one of the devices below the bridge is signaling PME, even if the bridge
65 * itself doesn't have a wake-up GPE associated with it.
66 */
67static acpi_status add_pm_notifier(struct acpi_device *dev,
68 acpi_notify_handler handler,
69 void *context)
70{
71 acpi_status status = AE_ALREADY_EXISTS;
72
73 mutex_lock(&pci_acpi_pm_notify_mtx);
74
75 if (dev->wakeup.flags.notifier_present)
76 goto out;
77
78 status = acpi_install_notify_handler(dev->handle,
79 ACPI_SYSTEM_NOTIFY,
80 handler, context);
81 if (ACPI_FAILURE(status))
82 goto out;
83
84 dev->wakeup.flags.notifier_present = true;
85
86 out:
87 mutex_unlock(&pci_acpi_pm_notify_mtx);
88 return status;
89}
90
91/**
92 * remove_pm_notifier - Unregister PM notifier from given ACPI device.
93 * @dev: ACPI device to remove the notifier from.
94 */
95static acpi_status remove_pm_notifier(struct acpi_device *dev,
96 acpi_notify_handler handler)
97{
98 acpi_status status = AE_BAD_PARAMETER;
99
100 mutex_lock(&pci_acpi_pm_notify_mtx);
101
102 if (!dev->wakeup.flags.notifier_present)
103 goto out;
104
105 status = acpi_remove_notify_handler(dev->handle,
106 ACPI_SYSTEM_NOTIFY,
107 handler);
108 if (ACPI_FAILURE(status))
109 goto out;
110
111 dev->wakeup.flags.notifier_present = false;
112
113 out:
114 mutex_unlock(&pci_acpi_pm_notify_mtx);
115 return status;
116}
117
118/**
119 * pci_acpi_add_bus_pm_notifier - Register PM notifier for given PCI bus.
120 * @dev: ACPI device to add the notifier for.
121 * @pci_bus: PCI bus to walk checking for PME status if an event is signaled.
122 */
123acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev,
124 struct pci_bus *pci_bus)
125{
126 return add_pm_notifier(dev, pci_acpi_wake_bus, pci_bus);
127}
128
129/**
130 * pci_acpi_remove_bus_pm_notifier - Unregister PCI bus PM notifier.
131 * @dev: ACPI device to remove the notifier from.
132 */
133acpi_status pci_acpi_remove_bus_pm_notifier(struct acpi_device *dev)
134{
135 return remove_pm_notifier(dev, pci_acpi_wake_bus);
136}
137
138/**
139 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
140 * @dev: ACPI device to add the notifier for.
141 * @pci_dev: PCI device to check for the PME status if an event is signaled.
142 */
143acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
144 struct pci_dev *pci_dev)
145{
146 return add_pm_notifier(dev, pci_acpi_wake_dev, pci_dev);
147}
148
149/**
150 * pci_acpi_remove_pm_notifier - Unregister PCI device PM notifier.
151 * @dev: ACPI device to remove the notifier from.
152 */
153acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
154{
155 return remove_pm_notifier(dev, pci_acpi_wake_dev);
156}
157
158/*
159 * _SxD returns the D-state with the highest power
160 * (lowest D-state number) supported in the S-state "x".
161 *
162 * If the devices does not have a _PRW
163 * (Power Resources for Wake) supporting system wakeup from "x"
164 * then the OS is free to choose a lower power (higher number
165 * D-state) than the return value from _SxD.
166 *
167 * But if _PRW is enabled at S-state "x", the OS
168 * must not choose a power lower than _SxD --
169 * unless the device has an _SxW method specifying
170 * the lowest power (highest D-state number) the device
171 * may enter while still able to wake the system.
172 *
173 * ie. depending on global OS policy:
174 *
175 * if (_PRW at S-state x)
176 * choose from highest power _SxD to lowest power _SxW
177 * else // no _PRW at S-state x
178 * choose highest power _SxD or any lower power
179 */
180
181static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
182{
183 int acpi_state;
184
185 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL);
186 if (acpi_state < 0)
187 return PCI_POWER_ERROR;
188
189 switch (acpi_state) {
190 case ACPI_STATE_D0:
191 return PCI_D0;
192 case ACPI_STATE_D1:
193 return PCI_D1;
194 case ACPI_STATE_D2:
195 return PCI_D2;
196 case ACPI_STATE_D3:
197 return PCI_D3hot;
198 case ACPI_STATE_D3_COLD:
199 return PCI_D3cold;
200 }
201 return PCI_POWER_ERROR;
202}
203
204static bool acpi_pci_power_manageable(struct pci_dev *dev)
205{
206 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
207
208 return handle ? acpi_bus_power_manageable(handle) : false;
209}
210
211static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
212{
213 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
214 acpi_handle tmp;
215 static const u8 state_conv[] = {
216 [PCI_D0] = ACPI_STATE_D0,
217 [PCI_D1] = ACPI_STATE_D1,
218 [PCI_D2] = ACPI_STATE_D2,
219 [PCI_D3hot] = ACPI_STATE_D3,
220 [PCI_D3cold] = ACPI_STATE_D3
221 };
222 int error = -EINVAL;
223
224 /* If the ACPI device has _EJ0, ignore the device */
225 if (!handle || ACPI_SUCCESS(acpi_get_handle(handle, "_EJ0", &tmp)))
226 return -ENODEV;
227
228 switch (state) {
229 case PCI_D0:
230 case PCI_D1:
231 case PCI_D2:
232 case PCI_D3hot:
233 case PCI_D3cold:
234 error = acpi_bus_set_power(handle, state_conv[state]);
235 }
236
237 if (!error)
238 dev_printk(KERN_INFO, &dev->dev,
239 "power state changed by ACPI to D%d\n", state);
240
241 return error;
242}
243
244static bool acpi_pci_can_wakeup(struct pci_dev *dev)
245{
246 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
247
248 return handle ? acpi_bus_can_wakeup(handle) : false;
249}
250
251static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
252{
253 while (bus->parent) {
254 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
255 return;
256 bus = bus->parent;
257 }
258
259 /* We have reached the root bus. */
260 if (bus->bridge)
261 acpi_pm_device_sleep_wake(bus->bridge, enable);
262}
263
264static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
265{
266 if (acpi_pci_can_wakeup(dev))
267 return acpi_pm_device_sleep_wake(&dev->dev, enable);
268
269 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
270 return 0;
271}
272
273/**
274 * acpi_dev_run_wake - Enable/disable wake-up for given device.
275 * @phys_dev: Device to enable/disable the platform to wake-up the system for.
276 * @enable: Whether enable or disable the wake-up functionality.
277 *
278 * Find the ACPI device object corresponding to @pci_dev and try to
279 * enable/disable the GPE associated with it.
280 */
281static int acpi_dev_run_wake(struct device *phys_dev, bool enable)
282{
283 struct acpi_device *dev;
284 acpi_handle handle;
285 int error = -ENODEV;
286
287 if (!device_run_wake(phys_dev))
288 return -EINVAL;
289
290 handle = DEVICE_ACPI_HANDLE(phys_dev);
291 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
292 dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
293 __func__);
294 return -ENODEV;
295 }
296
297 if (enable) {
298 acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
299 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
300 } else {
301 acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
302 acpi_disable_wakeup_device_power(dev);
303 }
304
305 return error;
306}
307
308static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
309{
310 while (bus->parent) {
311 struct pci_dev *bridge = bus->self;
312
313 if (bridge->pme_interrupt)
314 return;
315 if (!acpi_dev_run_wake(&bridge->dev, enable))
316 return;
317 bus = bus->parent;
318 }
319
320 /* We have reached the root bus. */
321 if (bus->bridge)
322 acpi_dev_run_wake(bus->bridge, enable);
323}
324
325static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
326{
327 if (dev->pme_interrupt)
328 return 0;
329
330 if (!acpi_dev_run_wake(&dev->dev, enable))
331 return 0;
332
333 acpi_pci_propagate_run_wake(dev->bus, enable);
334 return 0;
335}
336
337static struct pci_platform_pm_ops acpi_pci_platform_pm = {
338 .is_manageable = acpi_pci_power_manageable,
339 .set_state = acpi_pci_set_power_state,
340 .choose_state = acpi_pci_choose_state,
341 .can_wakeup = acpi_pci_can_wakeup,
342 .sleep_wake = acpi_pci_sleep_wake,
343 .run_wake = acpi_pci_run_wake,
344};
345
346/* ACPI bus type */
347static int acpi_pci_find_device(struct device *dev, acpi_handle *handle)
348{
349 struct pci_dev * pci_dev;
350 u64 addr;
351
352 pci_dev = to_pci_dev(dev);
353 /* Please ref to ACPI spec for the syntax of _ADR */
354 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
355 *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), addr);
356 if (!*handle)
357 return -ENODEV;
358 return 0;
359}
360
361static int acpi_pci_find_root_bridge(struct device *dev, acpi_handle *handle)
362{
363 int num;
364 unsigned int seg, bus;
365
366 /*
367 * The string should be the same as root bridge's name
368 * Please look at 'pci_scan_bus_parented'
369 */
370 num = sscanf(dev_name(dev), "pci%04x:%02x", &seg, &bus);
371 if (num != 2)
372 return -ENODEV;
373 *handle = acpi_get_pci_rootbridge_handle(seg, bus);
374 if (!*handle)
375 return -ENODEV;
376 return 0;
377}
378
379static struct acpi_bus_type acpi_pci_bus = {
380 .bus = &pci_bus_type,
381 .find_device = acpi_pci_find_device,
382 .find_bridge = acpi_pci_find_root_bridge,
383};
384
385static int __init acpi_pci_init(void)
386{
387 int ret;
388
389 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
390 printk(KERN_INFO"ACPI FADT declares the system doesn't support MSI, so disable it\n");
391 pci_no_msi();
392 }
393
394 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
395 printk(KERN_INFO"ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
396 pcie_clear_aspm();
397 pcie_no_aspm();
398 }
399
400 ret = register_acpi_bus_type(&acpi_pci_bus);
401 if (ret)
402 return 0;
403 pci_set_platform_pm(&acpi_pci_platform_pm);
404 return 0;
405}
406arch_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
32#if defined(CONFIG_PCI_QUIRKS) && defined(CONFIG_ARM64)
33static int acpi_get_rc_addr(struct acpi_device *adev, struct resource *res)
34{
35 struct device *dev = &adev->dev;
36 struct resource_entry *entry;
37 struct list_head list;
38 unsigned long flags;
39 int ret;
40
41 INIT_LIST_HEAD(&list);
42 flags = IORESOURCE_MEM;
43 ret = acpi_dev_get_resources(adev, &list,
44 acpi_dev_filter_resource_type_cb,
45 (void *) flags);
46 if (ret < 0) {
47 dev_err(dev, "failed to parse _CRS method, error code %d\n",
48 ret);
49 return ret;
50 }
51
52 if (ret == 0) {
53 dev_err(dev, "no IO and memory resources present in _CRS\n");
54 return -EINVAL;
55 }
56
57 entry = list_first_entry(&list, struct resource_entry, node);
58 *res = *entry->res;
59 acpi_dev_free_resource_list(&list);
60 return 0;
61}
62
63static acpi_status acpi_match_rc(acpi_handle handle, u32 lvl, void *context,
64 void **retval)
65{
66 u16 *segment = context;
67 unsigned long long uid;
68 acpi_status status;
69
70 status = acpi_evaluate_integer(handle, "_UID", NULL, &uid);
71 if (ACPI_FAILURE(status) || uid != *segment)
72 return AE_CTRL_DEPTH;
73
74 *(acpi_handle *)retval = handle;
75 return AE_CTRL_TERMINATE;
76}
77
78int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
79 struct resource *res)
80{
81 struct acpi_device *adev;
82 acpi_status status;
83 acpi_handle handle;
84 int ret;
85
86 status = acpi_get_devices(hid, acpi_match_rc, &segment, &handle);
87 if (ACPI_FAILURE(status)) {
88 dev_err(dev, "can't find _HID %s device to locate resources\n",
89 hid);
90 return -ENODEV;
91 }
92
93 ret = acpi_bus_get_device(handle, &adev);
94 if (ret)
95 return ret;
96
97 ret = acpi_get_rc_addr(adev, res);
98 if (ret) {
99 dev_err(dev, "can't get resource from %s\n",
100 dev_name(&adev->dev));
101 return ret;
102 }
103
104 return 0;
105}
106#endif
107
108phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
109{
110 acpi_status status = AE_NOT_EXIST;
111 unsigned long long mcfg_addr;
112
113 if (handle)
114 status = acpi_evaluate_integer(handle, METHOD_NAME__CBA,
115 NULL, &mcfg_addr);
116 if (ACPI_FAILURE(status))
117 return 0;
118
119 return (phys_addr_t)mcfg_addr;
120}
121
122static acpi_status decode_type0_hpx_record(union acpi_object *record,
123 struct hotplug_params *hpx)
124{
125 int i;
126 union acpi_object *fields = record->package.elements;
127 u32 revision = fields[1].integer.value;
128
129 switch (revision) {
130 case 1:
131 if (record->package.count != 6)
132 return AE_ERROR;
133 for (i = 2; i < 6; i++)
134 if (fields[i].type != ACPI_TYPE_INTEGER)
135 return AE_ERROR;
136 hpx->t0 = &hpx->type0_data;
137 hpx->t0->revision = revision;
138 hpx->t0->cache_line_size = fields[2].integer.value;
139 hpx->t0->latency_timer = fields[3].integer.value;
140 hpx->t0->enable_serr = fields[4].integer.value;
141 hpx->t0->enable_perr = fields[5].integer.value;
142 break;
143 default:
144 printk(KERN_WARNING
145 "%s: Type 0 Revision %d record not supported\n",
146 __func__, revision);
147 return AE_ERROR;
148 }
149 return AE_OK;
150}
151
152static acpi_status decode_type1_hpx_record(union acpi_object *record,
153 struct hotplug_params *hpx)
154{
155 int i;
156 union acpi_object *fields = record->package.elements;
157 u32 revision = fields[1].integer.value;
158
159 switch (revision) {
160 case 1:
161 if (record->package.count != 5)
162 return AE_ERROR;
163 for (i = 2; i < 5; i++)
164 if (fields[i].type != ACPI_TYPE_INTEGER)
165 return AE_ERROR;
166 hpx->t1 = &hpx->type1_data;
167 hpx->t1->revision = revision;
168 hpx->t1->max_mem_read = fields[2].integer.value;
169 hpx->t1->avg_max_split = fields[3].integer.value;
170 hpx->t1->tot_max_split = fields[4].integer.value;
171 break;
172 default:
173 printk(KERN_WARNING
174 "%s: Type 1 Revision %d record not supported\n",
175 __func__, revision);
176 return AE_ERROR;
177 }
178 return AE_OK;
179}
180
181static acpi_status decode_type2_hpx_record(union acpi_object *record,
182 struct hotplug_params *hpx)
183{
184 int i;
185 union acpi_object *fields = record->package.elements;
186 u32 revision = fields[1].integer.value;
187
188 switch (revision) {
189 case 1:
190 if (record->package.count != 18)
191 return AE_ERROR;
192 for (i = 2; i < 18; i++)
193 if (fields[i].type != ACPI_TYPE_INTEGER)
194 return AE_ERROR;
195 hpx->t2 = &hpx->type2_data;
196 hpx->t2->revision = revision;
197 hpx->t2->unc_err_mask_and = fields[2].integer.value;
198 hpx->t2->unc_err_mask_or = fields[3].integer.value;
199 hpx->t2->unc_err_sever_and = fields[4].integer.value;
200 hpx->t2->unc_err_sever_or = fields[5].integer.value;
201 hpx->t2->cor_err_mask_and = fields[6].integer.value;
202 hpx->t2->cor_err_mask_or = fields[7].integer.value;
203 hpx->t2->adv_err_cap_and = fields[8].integer.value;
204 hpx->t2->adv_err_cap_or = fields[9].integer.value;
205 hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
206 hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
207 hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
208 hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
209 hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
210 hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
211 hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
212 hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
213 break;
214 default:
215 printk(KERN_WARNING
216 "%s: Type 2 Revision %d record not supported\n",
217 __func__, revision);
218 return AE_ERROR;
219 }
220 return AE_OK;
221}
222
223static acpi_status acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
224{
225 acpi_status status;
226 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
227 union acpi_object *package, *record, *fields;
228 u32 type;
229 int i;
230
231 /* Clear the return buffer with zeros */
232 memset(hpx, 0, sizeof(struct hotplug_params));
233
234 status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
235 if (ACPI_FAILURE(status))
236 return status;
237
238 package = (union acpi_object *)buffer.pointer;
239 if (package->type != ACPI_TYPE_PACKAGE) {
240 status = AE_ERROR;
241 goto exit;
242 }
243
244 for (i = 0; i < package->package.count; i++) {
245 record = &package->package.elements[i];
246 if (record->type != ACPI_TYPE_PACKAGE) {
247 status = AE_ERROR;
248 goto exit;
249 }
250
251 fields = record->package.elements;
252 if (fields[0].type != ACPI_TYPE_INTEGER ||
253 fields[1].type != ACPI_TYPE_INTEGER) {
254 status = AE_ERROR;
255 goto exit;
256 }
257
258 type = fields[0].integer.value;
259 switch (type) {
260 case 0:
261 status = decode_type0_hpx_record(record, hpx);
262 if (ACPI_FAILURE(status))
263 goto exit;
264 break;
265 case 1:
266 status = decode_type1_hpx_record(record, hpx);
267 if (ACPI_FAILURE(status))
268 goto exit;
269 break;
270 case 2:
271 status = decode_type2_hpx_record(record, hpx);
272 if (ACPI_FAILURE(status))
273 goto exit;
274 break;
275 default:
276 printk(KERN_ERR "%s: Type %d record not supported\n",
277 __func__, type);
278 status = AE_ERROR;
279 goto exit;
280 }
281 }
282 exit:
283 kfree(buffer.pointer);
284 return status;
285}
286
287static acpi_status acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
288{
289 acpi_status status;
290 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
291 union acpi_object *package, *fields;
292 int i;
293
294 memset(hpp, 0, sizeof(struct hotplug_params));
295
296 status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
297 if (ACPI_FAILURE(status))
298 return status;
299
300 package = (union acpi_object *) buffer.pointer;
301 if (package->type != ACPI_TYPE_PACKAGE ||
302 package->package.count != 4) {
303 status = AE_ERROR;
304 goto exit;
305 }
306
307 fields = package->package.elements;
308 for (i = 0; i < 4; i++) {
309 if (fields[i].type != ACPI_TYPE_INTEGER) {
310 status = AE_ERROR;
311 goto exit;
312 }
313 }
314
315 hpp->t0 = &hpp->type0_data;
316 hpp->t0->revision = 1;
317 hpp->t0->cache_line_size = fields[0].integer.value;
318 hpp->t0->latency_timer = fields[1].integer.value;
319 hpp->t0->enable_serr = fields[2].integer.value;
320 hpp->t0->enable_perr = fields[3].integer.value;
321
322exit:
323 kfree(buffer.pointer);
324 return status;
325}
326
327/* pci_get_hp_params
328 *
329 * @dev - the pci_dev for which we want parameters
330 * @hpp - allocated by the caller
331 */
332int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
333{
334 acpi_status status;
335 acpi_handle handle, phandle;
336 struct pci_bus *pbus;
337
338 if (acpi_pci_disabled)
339 return -ENODEV;
340
341 handle = NULL;
342 for (pbus = dev->bus; pbus; pbus = pbus->parent) {
343 handle = acpi_pci_get_bridge_handle(pbus);
344 if (handle)
345 break;
346 }
347
348 /*
349 * _HPP settings apply to all child buses, until another _HPP is
350 * encountered. If we don't find an _HPP for the input pci dev,
351 * look for it in the parent device scope since that would apply to
352 * this pci dev.
353 */
354 while (handle) {
355 status = acpi_run_hpx(handle, hpp);
356 if (ACPI_SUCCESS(status))
357 return 0;
358 status = acpi_run_hpp(handle, hpp);
359 if (ACPI_SUCCESS(status))
360 return 0;
361 if (acpi_is_root_bridge(handle))
362 break;
363 status = acpi_get_parent(handle, &phandle);
364 if (ACPI_FAILURE(status))
365 break;
366 handle = phandle;
367 }
368 return -ENODEV;
369}
370EXPORT_SYMBOL_GPL(pci_get_hp_params);
371
372/**
373 * pciehp_is_native - Check whether a hotplug port is handled by the OS
374 * @pdev: Hotplug port to check
375 *
376 * Walk up from @pdev to the host bridge, obtain its cached _OSC Control Field
377 * and return the value of the "PCI Express Native Hot Plug control" bit.
378 * On failure to obtain the _OSC Control Field return %false.
379 */
380bool pciehp_is_native(struct pci_dev *pdev)
381{
382 struct acpi_pci_root *root;
383 acpi_handle handle;
384
385 handle = acpi_find_root_bridge_handle(pdev);
386 if (!handle)
387 return false;
388
389 root = acpi_pci_find_root(handle);
390 if (!root)
391 return false;
392
393 return root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL;
394}
395
396/**
397 * pci_acpi_wake_bus - Root bus wakeup notification fork function.
398 * @work: Work item to handle.
399 */
400static void pci_acpi_wake_bus(struct work_struct *work)
401{
402 struct acpi_device *adev;
403 struct acpi_pci_root *root;
404
405 adev = container_of(work, struct acpi_device, wakeup.context.work);
406 root = acpi_driver_data(adev);
407 pci_pme_wakeup_bus(root->bus);
408}
409
410/**
411 * pci_acpi_wake_dev - PCI device wakeup notification work function.
412 * @handle: ACPI handle of a device the notification is for.
413 * @work: Work item to handle.
414 */
415static void pci_acpi_wake_dev(struct work_struct *work)
416{
417 struct acpi_device_wakeup_context *context;
418 struct pci_dev *pci_dev;
419
420 context = container_of(work, struct acpi_device_wakeup_context, work);
421 pci_dev = to_pci_dev(context->dev);
422
423 if (pci_dev->pme_poll)
424 pci_dev->pme_poll = false;
425
426 if (pci_dev->current_state == PCI_D3cold) {
427 pci_wakeup_event(pci_dev);
428 pm_runtime_resume(&pci_dev->dev);
429 return;
430 }
431
432 /* Clear PME Status if set. */
433 if (pci_dev->pme_support)
434 pci_check_pme_status(pci_dev);
435
436 pci_wakeup_event(pci_dev);
437 pm_runtime_resume(&pci_dev->dev);
438
439 pci_pme_wakeup_bus(pci_dev->subordinate);
440}
441
442/**
443 * pci_acpi_add_bus_pm_notifier - Register PM notifier for root PCI bus.
444 * @dev: PCI root bridge ACPI device.
445 */
446acpi_status pci_acpi_add_bus_pm_notifier(struct acpi_device *dev)
447{
448 return acpi_add_pm_notifier(dev, NULL, pci_acpi_wake_bus);
449}
450
451/**
452 * pci_acpi_add_pm_notifier - Register PM notifier for given PCI device.
453 * @dev: ACPI device to add the notifier for.
454 * @pci_dev: PCI device to check for the PME status if an event is signaled.
455 */
456acpi_status pci_acpi_add_pm_notifier(struct acpi_device *dev,
457 struct pci_dev *pci_dev)
458{
459 return acpi_add_pm_notifier(dev, &pci_dev->dev, pci_acpi_wake_dev);
460}
461
462/*
463 * _SxD returns the D-state with the highest power
464 * (lowest D-state number) supported in the S-state "x".
465 *
466 * If the devices does not have a _PRW
467 * (Power Resources for Wake) supporting system wakeup from "x"
468 * then the OS is free to choose a lower power (higher number
469 * D-state) than the return value from _SxD.
470 *
471 * But if _PRW is enabled at S-state "x", the OS
472 * must not choose a power lower than _SxD --
473 * unless the device has an _SxW method specifying
474 * the lowest power (highest D-state number) the device
475 * may enter while still able to wake the system.
476 *
477 * ie. depending on global OS policy:
478 *
479 * if (_PRW at S-state x)
480 * choose from highest power _SxD to lowest power _SxW
481 * else // no _PRW at S-state x
482 * choose highest power _SxD or any lower power
483 */
484
485static pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
486{
487 int acpi_state, d_max;
488
489 if (pdev->no_d3cold)
490 d_max = ACPI_STATE_D3_HOT;
491 else
492 d_max = ACPI_STATE_D3_COLD;
493 acpi_state = acpi_pm_device_sleep_state(&pdev->dev, NULL, d_max);
494 if (acpi_state < 0)
495 return PCI_POWER_ERROR;
496
497 switch (acpi_state) {
498 case ACPI_STATE_D0:
499 return PCI_D0;
500 case ACPI_STATE_D1:
501 return PCI_D1;
502 case ACPI_STATE_D2:
503 return PCI_D2;
504 case ACPI_STATE_D3_HOT:
505 return PCI_D3hot;
506 case ACPI_STATE_D3_COLD:
507 return PCI_D3cold;
508 }
509 return PCI_POWER_ERROR;
510}
511
512static bool acpi_pci_power_manageable(struct pci_dev *dev)
513{
514 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
515 return adev ? acpi_device_power_manageable(adev) : false;
516}
517
518static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
519{
520 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
521 static const u8 state_conv[] = {
522 [PCI_D0] = ACPI_STATE_D0,
523 [PCI_D1] = ACPI_STATE_D1,
524 [PCI_D2] = ACPI_STATE_D2,
525 [PCI_D3hot] = ACPI_STATE_D3_HOT,
526 [PCI_D3cold] = ACPI_STATE_D3_COLD,
527 };
528 int error = -EINVAL;
529
530 /* If the ACPI device has _EJ0, ignore the device */
531 if (!adev || acpi_has_method(adev->handle, "_EJ0"))
532 return -ENODEV;
533
534 switch (state) {
535 case PCI_D3cold:
536 if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
537 PM_QOS_FLAGS_ALL) {
538 error = -EBUSY;
539 break;
540 }
541 case PCI_D0:
542 case PCI_D1:
543 case PCI_D2:
544 case PCI_D3hot:
545 error = acpi_device_set_power(adev, state_conv[state]);
546 }
547
548 if (!error)
549 dev_dbg(&dev->dev, "power state changed by ACPI to %s\n",
550 acpi_power_state_string(state_conv[state]));
551
552 return error;
553}
554
555static pci_power_t acpi_pci_get_power_state(struct pci_dev *dev)
556{
557 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
558 static const pci_power_t state_conv[] = {
559 [ACPI_STATE_D0] = PCI_D0,
560 [ACPI_STATE_D1] = PCI_D1,
561 [ACPI_STATE_D2] = PCI_D2,
562 [ACPI_STATE_D3_HOT] = PCI_D3hot,
563 [ACPI_STATE_D3_COLD] = PCI_D3cold,
564 };
565 int state;
566
567 if (!adev || !acpi_device_power_manageable(adev))
568 return PCI_UNKNOWN;
569
570 if (acpi_device_get_power(adev, &state) || state == ACPI_STATE_UNKNOWN)
571 return PCI_UNKNOWN;
572
573 return state_conv[state];
574}
575
576static bool acpi_pci_can_wakeup(struct pci_dev *dev)
577{
578 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
579 return adev ? acpi_device_can_wakeup(adev) : false;
580}
581
582static void acpi_pci_propagate_wakeup_enable(struct pci_bus *bus, bool enable)
583{
584 while (bus->parent) {
585 if (!acpi_pm_device_sleep_wake(&bus->self->dev, enable))
586 return;
587 bus = bus->parent;
588 }
589
590 /* We have reached the root bus. */
591 if (bus->bridge)
592 acpi_pm_device_sleep_wake(bus->bridge, enable);
593}
594
595static int acpi_pci_sleep_wake(struct pci_dev *dev, bool enable)
596{
597 if (acpi_pci_can_wakeup(dev))
598 return acpi_pm_device_sleep_wake(&dev->dev, enable);
599
600 acpi_pci_propagate_wakeup_enable(dev->bus, enable);
601 return 0;
602}
603
604static void acpi_pci_propagate_run_wake(struct pci_bus *bus, bool enable)
605{
606 while (bus->parent) {
607 struct pci_dev *bridge = bus->self;
608
609 if (bridge->pme_interrupt)
610 return;
611 if (!acpi_pm_device_run_wake(&bridge->dev, enable))
612 return;
613 bus = bus->parent;
614 }
615
616 /* We have reached the root bus. */
617 if (bus->bridge)
618 acpi_pm_device_run_wake(bus->bridge, enable);
619}
620
621static int acpi_pci_run_wake(struct pci_dev *dev, bool enable)
622{
623 /*
624 * Per PCI Express Base Specification Revision 2.0 section
625 * 5.3.3.2 Link Wakeup, platform support is needed for D3cold
626 * waking up to power on the main link even if there is PME
627 * support for D3cold
628 */
629 if (dev->pme_interrupt && !dev->runtime_d3cold)
630 return 0;
631
632 if (!acpi_pm_device_run_wake(&dev->dev, enable))
633 return 0;
634
635 acpi_pci_propagate_run_wake(dev->bus, enable);
636 return 0;
637}
638
639static bool acpi_pci_need_resume(struct pci_dev *dev)
640{
641 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
642
643 if (!adev || !acpi_device_power_manageable(adev))
644 return false;
645
646 if (device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
647 return true;
648
649 if (acpi_target_system_state() == ACPI_STATE_S0)
650 return false;
651
652 return !!adev->power.flags.dsw_present;
653}
654
655static const struct pci_platform_pm_ops acpi_pci_platform_pm = {
656 .is_manageable = acpi_pci_power_manageable,
657 .set_state = acpi_pci_set_power_state,
658 .get_state = acpi_pci_get_power_state,
659 .choose_state = acpi_pci_choose_state,
660 .sleep_wake = acpi_pci_sleep_wake,
661 .run_wake = acpi_pci_run_wake,
662 .need_resume = acpi_pci_need_resume,
663};
664
665void acpi_pci_add_bus(struct pci_bus *bus)
666{
667 union acpi_object *obj;
668 struct pci_host_bridge *bridge;
669
670 if (acpi_pci_disabled || !bus->bridge)
671 return;
672
673 acpi_pci_slot_enumerate(bus);
674 acpiphp_enumerate_slots(bus);
675
676 /*
677 * For a host bridge, check its _DSM for function 8 and if
678 * that is available, mark it in pci_host_bridge.
679 */
680 if (!pci_is_root_bus(bus))
681 return;
682
683 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), pci_acpi_dsm_uuid, 3,
684 RESET_DELAY_DSM, NULL);
685 if (!obj)
686 return;
687
688 if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
689 bridge = pci_find_host_bridge(bus);
690 bridge->ignore_reset_delay = 1;
691 }
692 ACPI_FREE(obj);
693}
694
695void acpi_pci_remove_bus(struct pci_bus *bus)
696{
697 if (acpi_pci_disabled || !bus->bridge)
698 return;
699
700 acpiphp_remove_slots(bus);
701 acpi_pci_slot_remove(bus);
702}
703
704/* ACPI bus type */
705static struct acpi_device *acpi_pci_find_companion(struct device *dev)
706{
707 struct pci_dev *pci_dev = to_pci_dev(dev);
708 bool check_children;
709 u64 addr;
710
711 check_children = pci_is_bridge(pci_dev);
712 /* Please ref to ACPI spec for the syntax of _ADR */
713 addr = (PCI_SLOT(pci_dev->devfn) << 16) | PCI_FUNC(pci_dev->devfn);
714 return acpi_find_child_device(ACPI_COMPANION(dev->parent), addr,
715 check_children);
716}
717
718/**
719 * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
720 * @pdev: the PCI device whose delay is to be updated
721 * @handle: ACPI handle of this device
722 *
723 * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
724 * control method of either the device itself or the PCI host bridge.
725 *
726 * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
727 * host bridge. If it returns one, the OS may assume that all devices in
728 * the hierarchy have already completed power-on reset delays.
729 *
730 * Function 9, "Device Readiness Durations," applies only to the object
731 * where it is located. It returns delay durations required after various
732 * events if the device requires less time than the spec requires. Delays
733 * from this function take precedence over the Reset Delay function.
734 *
735 * These _DSM functions are defined by the draft ECN of January 28, 2014,
736 * titled "ACPI additions for FW latency optimizations."
737 */
738static void pci_acpi_optimize_delay(struct pci_dev *pdev,
739 acpi_handle handle)
740{
741 struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
742 int value;
743 union acpi_object *obj, *elements;
744
745 if (bridge->ignore_reset_delay)
746 pdev->d3cold_delay = 0;
747
748 obj = acpi_evaluate_dsm(handle, pci_acpi_dsm_uuid, 3,
749 FUNCTION_DELAY_DSM, NULL);
750 if (!obj)
751 return;
752
753 if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
754 elements = obj->package.elements;
755 if (elements[0].type == ACPI_TYPE_INTEGER) {
756 value = (int)elements[0].integer.value / 1000;
757 if (value < PCI_PM_D3COLD_WAIT)
758 pdev->d3cold_delay = value;
759 }
760 if (elements[3].type == ACPI_TYPE_INTEGER) {
761 value = (int)elements[3].integer.value / 1000;
762 if (value < PCI_PM_D3_WAIT)
763 pdev->d3_delay = value;
764 }
765 }
766 ACPI_FREE(obj);
767}
768
769static void pci_acpi_setup(struct device *dev)
770{
771 struct pci_dev *pci_dev = to_pci_dev(dev);
772 struct acpi_device *adev = ACPI_COMPANION(dev);
773
774 if (!adev)
775 return;
776
777 pci_acpi_optimize_delay(pci_dev, adev->handle);
778
779 pci_acpi_add_pm_notifier(adev, pci_dev);
780 if (!adev->wakeup.flags.valid)
781 return;
782
783 device_set_wakeup_capable(dev, true);
784 acpi_pci_sleep_wake(pci_dev, false);
785 if (adev->wakeup.flags.run_wake)
786 device_set_run_wake(dev, true);
787}
788
789static void pci_acpi_cleanup(struct device *dev)
790{
791 struct acpi_device *adev = ACPI_COMPANION(dev);
792
793 if (!adev)
794 return;
795
796 pci_acpi_remove_pm_notifier(adev);
797 if (adev->wakeup.flags.valid) {
798 device_set_wakeup_capable(dev, false);
799 device_set_run_wake(dev, false);
800 }
801}
802
803static bool pci_acpi_bus_match(struct device *dev)
804{
805 return dev_is_pci(dev);
806}
807
808static struct acpi_bus_type acpi_pci_bus = {
809 .name = "PCI",
810 .match = pci_acpi_bus_match,
811 .find_companion = acpi_pci_find_companion,
812 .setup = pci_acpi_setup,
813 .cleanup = pci_acpi_cleanup,
814};
815
816
817static struct fwnode_handle *(*pci_msi_get_fwnode_cb)(struct device *dev);
818
819/**
820 * pci_msi_register_fwnode_provider - Register callback to retrieve fwnode
821 * @fn: Callback matching a device to a fwnode that identifies a PCI
822 * MSI domain.
823 *
824 * This should be called by irqchip driver, which is the parent of
825 * the MSI domain to provide callback interface to query fwnode.
826 */
827void
828pci_msi_register_fwnode_provider(struct fwnode_handle *(*fn)(struct device *))
829{
830 pci_msi_get_fwnode_cb = fn;
831}
832
833/**
834 * pci_host_bridge_acpi_msi_domain - Retrieve MSI domain of a PCI host bridge
835 * @bus: The PCI host bridge bus.
836 *
837 * This function uses the callback function registered by
838 * pci_msi_register_fwnode_provider() to retrieve the irq_domain with
839 * type DOMAIN_BUS_PCI_MSI of the specified host bridge bus.
840 * This returns NULL on error or when the domain is not found.
841 */
842struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
843{
844 struct fwnode_handle *fwnode;
845
846 if (!pci_msi_get_fwnode_cb)
847 return NULL;
848
849 fwnode = pci_msi_get_fwnode_cb(&bus->dev);
850 if (!fwnode)
851 return NULL;
852
853 return irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
854}
855
856static int __init acpi_pci_init(void)
857{
858 int ret;
859
860 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_MSI) {
861 pr_info("ACPI FADT declares the system doesn't support MSI, so disable it\n");
862 pci_no_msi();
863 }
864
865 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
866 pr_info("ACPI FADT declares the system doesn't support PCIe ASPM, so disable it\n");
867 pcie_no_aspm();
868 }
869
870 ret = register_acpi_bus_type(&acpi_pci_bus);
871 if (ret)
872 return 0;
873
874 pci_set_platform_pm(&acpi_pci_platform_pm);
875 acpi_pci_slot_init();
876 acpiphp_init();
877
878 return 0;
879}
880arch_initcall(acpi_pci_init);