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1/*
2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
3 *
4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
6 * Copyright (C) 2002,2003 NEC Corporation
7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
8 * Copyright (C) 2003-2005 Hewlett Packard
9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
10 * Copyright (C) 2005 Intel Corporation
11 *
12 * All rights reserved.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
22 * NON INFRINGEMENT. See the GNU General Public License for more
23 * details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 *
29 * Send feedback to <kristen.c.accardi@intel.com>
30 *
31 */
32
33/*
34 * Lifetime rules for pci_dev:
35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
36 * when the bridge is scanned and it loses a refcount when the bridge
37 * is removed.
38 * - When a P2P bridge is present, we elevate the refcount on the subordinate
39 * bus. It loses the refcount when the the driver unloads.
40 */
41
42#define pr_fmt(fmt) "acpiphp_glue: " fmt
43
44#include <linux/init.h>
45#include <linux/module.h>
46
47#include <linux/kernel.h>
48#include <linux/pci.h>
49#include <linux/pci_hotplug.h>
50#include <linux/pci-acpi.h>
51#include <linux/pm_runtime.h>
52#include <linux/mutex.h>
53#include <linux/slab.h>
54#include <linux/acpi.h>
55
56#include "../pci.h"
57#include "acpiphp.h"
58
59static LIST_HEAD(bridge_list);
60static DEFINE_MUTEX(bridge_mutex);
61
62static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type);
63static void acpiphp_post_dock_fixup(struct acpi_device *adev);
64static void acpiphp_sanitize_bus(struct pci_bus *bus);
65static void acpiphp_set_hpp_values(struct pci_bus *bus);
66static void hotplug_event(u32 type, struct acpiphp_context *context);
67static void free_bridge(struct kref *kref);
68
69/**
70 * acpiphp_init_context - Create hotplug context and grab a reference to it.
71 * @adev: ACPI device object to create the context for.
72 *
73 * Call under acpi_hp_context_lock.
74 */
75static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev)
76{
77 struct acpiphp_context *context;
78
79 context = kzalloc(sizeof(*context), GFP_KERNEL);
80 if (!context)
81 return NULL;
82
83 context->refcount = 1;
84 acpi_set_hp_context(adev, &context->hp, acpiphp_hotplug_notify, NULL,
85 acpiphp_post_dock_fixup);
86 return context;
87}
88
89/**
90 * acpiphp_get_context - Get hotplug context and grab a reference to it.
91 * @adev: ACPI device object to get the context for.
92 *
93 * Call under acpi_hp_context_lock.
94 */
95static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev)
96{
97 struct acpiphp_context *context;
98
99 if (!adev->hp)
100 return NULL;
101
102 context = to_acpiphp_context(adev->hp);
103 context->refcount++;
104 return context;
105}
106
107/**
108 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
109 * @context: ACPI hotplug context to drop a reference to.
110 *
111 * The context object is removed if there are no more references to it.
112 *
113 * Call under acpi_hp_context_lock.
114 */
115static void acpiphp_put_context(struct acpiphp_context *context)
116{
117 if (--context->refcount)
118 return;
119
120 WARN_ON(context->bridge);
121 context->hp.self->hp = NULL;
122 kfree(context);
123}
124
125static inline void get_bridge(struct acpiphp_bridge *bridge)
126{
127 kref_get(&bridge->ref);
128}
129
130static inline void put_bridge(struct acpiphp_bridge *bridge)
131{
132 kref_put(&bridge->ref, free_bridge);
133}
134
135static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev)
136{
137 struct acpiphp_context *context;
138
139 acpi_lock_hp_context();
140 context = acpiphp_get_context(adev);
141 if (!context || context->func.parent->is_going_away) {
142 acpi_unlock_hp_context();
143 return NULL;
144 }
145 get_bridge(context->func.parent);
146 acpiphp_put_context(context);
147 acpi_unlock_hp_context();
148 return context;
149}
150
151static void acpiphp_let_context_go(struct acpiphp_context *context)
152{
153 put_bridge(context->func.parent);
154}
155
156static void free_bridge(struct kref *kref)
157{
158 struct acpiphp_context *context;
159 struct acpiphp_bridge *bridge;
160 struct acpiphp_slot *slot, *next;
161 struct acpiphp_func *func, *tmp;
162
163 acpi_lock_hp_context();
164
165 bridge = container_of(kref, struct acpiphp_bridge, ref);
166
167 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
168 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
169 acpiphp_put_context(func_to_context(func));
170
171 kfree(slot);
172 }
173
174 context = bridge->context;
175 /* Root bridges will not have hotplug context. */
176 if (context) {
177 /* Release the reference taken by acpiphp_enumerate_slots(). */
178 put_bridge(context->func.parent);
179 context->bridge = NULL;
180 acpiphp_put_context(context);
181 }
182
183 put_device(&bridge->pci_bus->dev);
184 pci_dev_put(bridge->pci_dev);
185 kfree(bridge);
186
187 acpi_unlock_hp_context();
188}
189
190/**
191 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
192 * @adev: ACPI device object corresponding to a PCI device.
193 *
194 * TBD - figure out a way to only call fixups for systems that require them.
195 */
196static void acpiphp_post_dock_fixup(struct acpi_device *adev)
197{
198 struct acpiphp_context *context = acpiphp_grab_context(adev);
199 struct pci_bus *bus;
200 u32 buses;
201
202 if (!context)
203 return;
204
205 bus = context->func.slot->bus;
206 if (!bus->self)
207 goto out;
208
209 /* fixup bad _DCK function that rewrites
210 * secondary bridge on slot
211 */
212 pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses);
213
214 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
215 buses = (buses & 0xff000000)
216 | ((unsigned int)(bus->primary) << 0)
217 | ((unsigned int)(bus->busn_res.start) << 8)
218 | ((unsigned int)(bus->busn_res.end) << 16);
219 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
220 }
221
222 out:
223 acpiphp_let_context_go(context);
224}
225
226/* Check whether the PCI device is managed by native PCIe hotplug driver */
227static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
228{
229 u32 reg32;
230 acpi_handle tmp;
231 struct acpi_pci_root *root;
232
233 /* Check whether the PCIe port supports native PCIe hotplug */
234 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
235 return false;
236 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
237 return false;
238
239 /*
240 * Check whether native PCIe hotplug has been enabled for
241 * this PCIe hierarchy.
242 */
243 tmp = acpi_find_root_bridge_handle(pdev);
244 if (!tmp)
245 return false;
246 root = acpi_pci_find_root(tmp);
247 if (!root)
248 return false;
249 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
250 return false;
251
252 return true;
253}
254
255/**
256 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
257 * @handle: ACPI handle of the object to add a context to.
258 * @lvl: Not used.
259 * @data: The object's parent ACPIPHP bridge.
260 * @rv: Not used.
261 */
262static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
263 void **rv)
264{
265 struct acpiphp_bridge *bridge = data;
266 struct acpiphp_context *context;
267 struct acpi_device *adev;
268 struct acpiphp_slot *slot;
269 struct acpiphp_func *newfunc;
270 acpi_status status = AE_OK;
271 unsigned long long adr;
272 int device, function;
273 struct pci_bus *pbus = bridge->pci_bus;
274 struct pci_dev *pdev = bridge->pci_dev;
275 u32 val;
276
277 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
278 if (ACPI_FAILURE(status)) {
279 if (status != AE_NOT_FOUND)
280 acpi_handle_warn(handle,
281 "can't evaluate _ADR (%#x)\n", status);
282 return AE_OK;
283 }
284 if (acpi_bus_get_device(handle, &adev))
285 return AE_OK;
286
287 device = (adr >> 16) & 0xffff;
288 function = adr & 0xffff;
289
290 acpi_lock_hp_context();
291 context = acpiphp_init_context(adev);
292 if (!context) {
293 acpi_unlock_hp_context();
294 acpi_handle_err(handle, "No hotplug context\n");
295 return AE_NOT_EXIST;
296 }
297 newfunc = &context->func;
298 newfunc->function = function;
299 newfunc->parent = bridge;
300 acpi_unlock_hp_context();
301
302 /*
303 * If this is a dock device, its _EJ0 should be executed by the dock
304 * notify handler after calling _DCK.
305 */
306 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
307 newfunc->flags = FUNC_HAS_EJ0;
308
309 if (acpi_has_method(handle, "_STA"))
310 newfunc->flags |= FUNC_HAS_STA;
311
312 /* search for objects that share the same slot */
313 list_for_each_entry(slot, &bridge->slots, node)
314 if (slot->device == device)
315 goto slot_found;
316
317 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
318 if (!slot) {
319 acpi_lock_hp_context();
320 acpiphp_put_context(context);
321 acpi_unlock_hp_context();
322 return AE_NO_MEMORY;
323 }
324
325 slot->bus = bridge->pci_bus;
326 slot->device = device;
327 INIT_LIST_HEAD(&slot->funcs);
328
329 list_add_tail(&slot->node, &bridge->slots);
330
331 /*
332 * Expose slots to user space for functions that have _EJ0 or _RMV or
333 * are located in dock stations. Do not expose them for devices handled
334 * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
335 * expose slots to user space in those cases.
336 */
337 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
338 && !(pdev && device_is_managed_by_native_pciehp(pdev))) {
339 unsigned long long sun;
340 int retval;
341
342 bridge->nr_slots++;
343 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
344 if (ACPI_FAILURE(status))
345 sun = bridge->nr_slots;
346
347 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
348 sun, pci_domain_nr(pbus), pbus->number, device);
349
350 retval = acpiphp_register_hotplug_slot(slot, sun);
351 if (retval) {
352 slot->slot = NULL;
353 bridge->nr_slots--;
354 if (retval == -EBUSY)
355 pr_warn("Slot %llu already registered by another "
356 "hotplug driver\n", sun);
357 else
358 pr_warn("acpiphp_register_hotplug_slot failed "
359 "(err code = 0x%x)\n", retval);
360 }
361 /* Even if the slot registration fails, we can still use it. */
362 }
363
364 slot_found:
365 newfunc->slot = slot;
366 list_add_tail(&newfunc->sibling, &slot->funcs);
367
368 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
369 &val, 60*1000))
370 slot->flags |= SLOT_ENABLED;
371
372 return AE_OK;
373}
374
375static struct acpiphp_bridge *acpiphp_dev_to_bridge(struct acpi_device *adev)
376{
377 struct acpiphp_context *context;
378 struct acpiphp_bridge *bridge = NULL;
379
380 acpi_lock_hp_context();
381 context = acpiphp_get_context(adev);
382 if (context) {
383 bridge = context->bridge;
384 if (bridge)
385 get_bridge(bridge);
386
387 acpiphp_put_context(context);
388 }
389 acpi_unlock_hp_context();
390 return bridge;
391}
392
393static void cleanup_bridge(struct acpiphp_bridge *bridge)
394{
395 struct acpiphp_slot *slot;
396 struct acpiphp_func *func;
397
398 list_for_each_entry(slot, &bridge->slots, node) {
399 list_for_each_entry(func, &slot->funcs, sibling) {
400 struct acpi_device *adev = func_to_acpi_device(func);
401
402 acpi_lock_hp_context();
403 adev->hp->notify = NULL;
404 adev->hp->fixup = NULL;
405 acpi_unlock_hp_context();
406 }
407 slot->flags |= SLOT_IS_GOING_AWAY;
408 if (slot->slot)
409 acpiphp_unregister_hotplug_slot(slot);
410 }
411
412 mutex_lock(&bridge_mutex);
413 list_del(&bridge->list);
414 mutex_unlock(&bridge_mutex);
415
416 acpi_lock_hp_context();
417 bridge->is_going_away = true;
418 acpi_unlock_hp_context();
419}
420
421/**
422 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
423 * @bus: bus to start search with
424 */
425static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
426{
427 struct pci_bus *tmp;
428 unsigned char max, n;
429
430 /*
431 * pci_bus_max_busnr will return the highest
432 * reserved busnr for all these children.
433 * that is equivalent to the bus->subordinate
434 * value. We don't want to use the parent's
435 * bus->subordinate value because it could have
436 * padding in it.
437 */
438 max = bus->busn_res.start;
439
440 list_for_each_entry(tmp, &bus->children, node) {
441 n = pci_bus_max_busnr(tmp);
442 if (n > max)
443 max = n;
444 }
445 return max;
446}
447
448static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
449{
450 struct acpiphp_func *func;
451 union acpi_object params[2];
452 struct acpi_object_list arg_list;
453
454 list_for_each_entry(func, &slot->funcs, sibling) {
455 arg_list.count = 2;
456 arg_list.pointer = params;
457 params[0].type = ACPI_TYPE_INTEGER;
458 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
459 params[1].type = ACPI_TYPE_INTEGER;
460 params[1].integer.value = 1;
461 /* _REG is optional, we don't care about if there is failure */
462 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
463 NULL);
464 }
465}
466
467static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
468{
469 struct acpiphp_func *func;
470
471 /* quirk, or pcie could set it already */
472 if (dev->is_hotplug_bridge)
473 return;
474
475 list_for_each_entry(func, &slot->funcs, sibling) {
476 if (PCI_FUNC(dev->devfn) == func->function) {
477 dev->is_hotplug_bridge = 1;
478 break;
479 }
480 }
481}
482
483static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
484{
485 struct acpiphp_func *func;
486
487 list_for_each_entry(func, &slot->funcs, sibling) {
488 struct acpi_device *adev = func_to_acpi_device(func);
489
490 acpi_bus_scan(adev->handle);
491 if (acpi_device_enumerated(adev))
492 acpi_device_set_power(adev, ACPI_STATE_D0);
493 }
494 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
495}
496
497/**
498 * enable_slot - enable, configure a slot
499 * @slot: slot to be enabled
500 *
501 * This function should be called per *physical slot*,
502 * not per each slot object in ACPI namespace.
503 */
504static void __ref enable_slot(struct acpiphp_slot *slot)
505{
506 struct pci_dev *dev;
507 struct pci_bus *bus = slot->bus;
508 struct acpiphp_func *func;
509 int max, pass;
510 LIST_HEAD(add_list);
511
512 acpiphp_rescan_slot(slot);
513 max = acpiphp_max_busnr(bus);
514 for (pass = 0; pass < 2; pass++) {
515 list_for_each_entry(dev, &bus->devices, bus_list) {
516 if (PCI_SLOT(dev->devfn) != slot->device)
517 continue;
518
519 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
520 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
521 max = pci_scan_bridge(bus, dev, max, pass);
522 if (pass && dev->subordinate) {
523 check_hotplug_bridge(slot, dev);
524 pcibios_resource_survey_bus(dev->subordinate);
525 __pci_bus_size_bridges(dev->subordinate,
526 &add_list);
527 }
528 }
529 }
530 }
531 __pci_bus_assign_resources(bus, &add_list, NULL);
532
533 acpiphp_sanitize_bus(bus);
534 acpiphp_set_hpp_values(bus);
535 acpiphp_set_acpi_region(slot);
536
537 list_for_each_entry(dev, &bus->devices, bus_list) {
538 /* Assume that newly added devices are powered on already. */
539 if (!dev->is_added)
540 dev->current_state = PCI_D0;
541 }
542
543 pci_bus_add_devices(bus);
544
545 slot->flags |= SLOT_ENABLED;
546 list_for_each_entry(func, &slot->funcs, sibling) {
547 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
548 func->function));
549 if (!dev) {
550 /* Do not set SLOT_ENABLED flag if some funcs
551 are not added. */
552 slot->flags &= (~SLOT_ENABLED);
553 continue;
554 }
555 }
556}
557
558/**
559 * disable_slot - disable a slot
560 * @slot: ACPI PHP slot
561 */
562static void disable_slot(struct acpiphp_slot *slot)
563{
564 struct pci_bus *bus = slot->bus;
565 struct pci_dev *dev, *prev;
566 struct acpiphp_func *func;
567
568 /*
569 * enable_slot() enumerates all functions in this device via
570 * pci_scan_slot(), whether they have associated ACPI hotplug
571 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
572 * here.
573 */
574 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
575 if (PCI_SLOT(dev->devfn) == slot->device)
576 pci_stop_and_remove_bus_device(dev);
577
578 list_for_each_entry(func, &slot->funcs, sibling)
579 acpi_bus_trim(func_to_acpi_device(func));
580
581 slot->flags &= (~SLOT_ENABLED);
582}
583
584static bool acpiphp_no_hotplug(struct acpi_device *adev)
585{
586 return adev && adev->flags.no_hotplug;
587}
588
589static bool slot_no_hotplug(struct acpiphp_slot *slot)
590{
591 struct acpiphp_func *func;
592
593 list_for_each_entry(func, &slot->funcs, sibling)
594 if (acpiphp_no_hotplug(func_to_acpi_device(func)))
595 return true;
596
597 return false;
598}
599
600/**
601 * get_slot_status - get ACPI slot status
602 * @slot: ACPI PHP slot
603 *
604 * If a slot has _STA for each function and if any one of them
605 * returned non-zero status, return it.
606 *
607 * If a slot doesn't have _STA and if any one of its functions'
608 * configuration space is configured, return 0x0f as a _STA.
609 *
610 * Otherwise return 0.
611 */
612static unsigned int get_slot_status(struct acpiphp_slot *slot)
613{
614 unsigned long long sta = 0;
615 struct acpiphp_func *func;
616
617 list_for_each_entry(func, &slot->funcs, sibling) {
618 if (func->flags & FUNC_HAS_STA) {
619 acpi_status status;
620
621 status = acpi_evaluate_integer(func_to_handle(func),
622 "_STA", NULL, &sta);
623 if (ACPI_SUCCESS(status) && sta)
624 break;
625 } else {
626 u32 dvid;
627
628 pci_bus_read_config_dword(slot->bus,
629 PCI_DEVFN(slot->device,
630 func->function),
631 PCI_VENDOR_ID, &dvid);
632 if (dvid != 0xffffffff) {
633 sta = ACPI_STA_ALL;
634 break;
635 }
636 }
637 }
638
639 return (unsigned int)sta;
640}
641
642static inline bool device_status_valid(unsigned int sta)
643{
644 /*
645 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
646 * if the device is valid but does not require a device driver to be
647 * loaded (Section 6.3.7 of ACPI 5.0A).
648 */
649 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
650 return (sta & mask) == mask;
651}
652
653/**
654 * trim_stale_devices - remove PCI devices that are not responding.
655 * @dev: PCI device to start walking the hierarchy from.
656 */
657static void trim_stale_devices(struct pci_dev *dev)
658{
659 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
660 struct pci_bus *bus = dev->subordinate;
661 bool alive = false;
662
663 if (adev) {
664 acpi_status status;
665 unsigned long long sta;
666
667 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
668 alive = (ACPI_SUCCESS(status) && device_status_valid(sta))
669 || acpiphp_no_hotplug(adev);
670 }
671 if (!alive)
672 alive = pci_device_is_present(dev);
673
674 if (!alive) {
675 pci_stop_and_remove_bus_device(dev);
676 if (adev)
677 acpi_bus_trim(adev);
678 } else if (bus) {
679 struct pci_dev *child, *tmp;
680
681 /* The device is a bridge. so check the bus below it. */
682 pm_runtime_get_sync(&dev->dev);
683 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
684 trim_stale_devices(child);
685
686 pm_runtime_put(&dev->dev);
687 }
688}
689
690/**
691 * acpiphp_check_bridge - re-enumerate devices
692 * @bridge: where to begin re-enumeration
693 *
694 * Iterate over all slots under this bridge and make sure that if a
695 * card is present they are enabled, and if not they are disabled.
696 */
697static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
698{
699 struct acpiphp_slot *slot;
700
701 /* Bail out if the bridge is going away. */
702 if (bridge->is_going_away)
703 return;
704
705 list_for_each_entry(slot, &bridge->slots, node) {
706 struct pci_bus *bus = slot->bus;
707 struct pci_dev *dev, *tmp;
708
709 if (slot_no_hotplug(slot)) {
710 ; /* do nothing */
711 } else if (device_status_valid(get_slot_status(slot))) {
712 /* remove stale devices if any */
713 list_for_each_entry_safe_reverse(dev, tmp,
714 &bus->devices, bus_list)
715 if (PCI_SLOT(dev->devfn) == slot->device)
716 trim_stale_devices(dev);
717
718 /* configure all functions */
719 enable_slot(slot);
720 } else {
721 disable_slot(slot);
722 }
723 }
724}
725
726static void acpiphp_set_hpp_values(struct pci_bus *bus)
727{
728 struct pci_dev *dev;
729
730 list_for_each_entry(dev, &bus->devices, bus_list)
731 pci_configure_slot(dev);
732}
733
734/*
735 * Remove devices for which we could not assign resources, call
736 * arch specific code to fix-up the bus
737 */
738static void acpiphp_sanitize_bus(struct pci_bus *bus)
739{
740 struct pci_dev *dev, *tmp;
741 int i;
742 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
743
744 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
745 for (i=0; i<PCI_BRIDGE_RESOURCES; i++) {
746 struct resource *res = &dev->resource[i];
747 if ((res->flags & type_mask) && !res->start &&
748 res->end) {
749 /* Could not assign a required resources
750 * for this device, remove it */
751 pci_stop_and_remove_bus_device(dev);
752 break;
753 }
754 }
755 }
756}
757
758/*
759 * ACPI event handlers
760 */
761
762void acpiphp_check_host_bridge(struct acpi_device *adev)
763{
764 struct acpiphp_bridge *bridge;
765
766 bridge = acpiphp_dev_to_bridge(adev);
767 if (bridge) {
768 pci_lock_rescan_remove();
769
770 acpiphp_check_bridge(bridge);
771
772 pci_unlock_rescan_remove();
773 put_bridge(bridge);
774 }
775}
776
777static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
778
779static void hotplug_event(u32 type, struct acpiphp_context *context)
780{
781 acpi_handle handle = context->hp.self->handle;
782 struct acpiphp_func *func = &context->func;
783 struct acpiphp_slot *slot = func->slot;
784 struct acpiphp_bridge *bridge;
785
786 acpi_lock_hp_context();
787 bridge = context->bridge;
788 if (bridge)
789 get_bridge(bridge);
790
791 acpi_unlock_hp_context();
792
793 pci_lock_rescan_remove();
794
795 switch (type) {
796 case ACPI_NOTIFY_BUS_CHECK:
797 /* bus re-enumerate */
798 acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
799 if (bridge)
800 acpiphp_check_bridge(bridge);
801 else if (!(slot->flags & SLOT_IS_GOING_AWAY))
802 enable_slot(slot);
803
804 break;
805
806 case ACPI_NOTIFY_DEVICE_CHECK:
807 /* device check */
808 acpi_handle_debug(handle, "Device check in %s()\n", __func__);
809 if (bridge) {
810 acpiphp_check_bridge(bridge);
811 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
812 /*
813 * Check if anything has changed in the slot and rescan
814 * from the parent if that's the case.
815 */
816 if (acpiphp_rescan_slot(slot))
817 acpiphp_check_bridge(func->parent);
818 }
819 break;
820
821 case ACPI_NOTIFY_EJECT_REQUEST:
822 /* request device eject */
823 acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
824 acpiphp_disable_and_eject_slot(slot);
825 break;
826 }
827
828 pci_unlock_rescan_remove();
829 if (bridge)
830 put_bridge(bridge);
831}
832
833static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
834{
835 struct acpiphp_context *context;
836
837 context = acpiphp_grab_context(adev);
838 if (!context)
839 return -ENODATA;
840
841 hotplug_event(type, context);
842 acpiphp_let_context_go(context);
843 return 0;
844}
845
846/**
847 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
848 * @bus: PCI bus to enumerate the slots for.
849 *
850 * A "slot" is an object associated with a PCI device number. All functions
851 * (PCI devices) with the same bus and device number belong to the same slot.
852 */
853void acpiphp_enumerate_slots(struct pci_bus *bus)
854{
855 struct acpiphp_bridge *bridge;
856 struct acpi_device *adev;
857 acpi_handle handle;
858 acpi_status status;
859
860 if (acpiphp_disabled)
861 return;
862
863 adev = ACPI_COMPANION(bus->bridge);
864 if (!adev)
865 return;
866
867 handle = adev->handle;
868 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
869 if (!bridge) {
870 acpi_handle_err(handle, "No memory for bridge object\n");
871 return;
872 }
873
874 INIT_LIST_HEAD(&bridge->slots);
875 kref_init(&bridge->ref);
876 bridge->pci_dev = pci_dev_get(bus->self);
877 bridge->pci_bus = bus;
878
879 /*
880 * Grab a ref to the subordinate PCI bus in case the bus is
881 * removed via PCI core logical hotplug. The ref pins the bus
882 * (which we access during module unload).
883 */
884 get_device(&bus->dev);
885
886 if (!pci_is_root_bus(bridge->pci_bus)) {
887 struct acpiphp_context *context;
888
889 /*
890 * This bridge should have been registered as a hotplug function
891 * under its parent, so the context should be there, unless the
892 * parent is going to be handled by pciehp, in which case this
893 * bridge is not interesting to us either.
894 */
895 acpi_lock_hp_context();
896 context = acpiphp_get_context(adev);
897 if (!context) {
898 acpi_unlock_hp_context();
899 put_device(&bus->dev);
900 pci_dev_put(bridge->pci_dev);
901 kfree(bridge);
902 return;
903 }
904 bridge->context = context;
905 context->bridge = bridge;
906 /* Get a reference to the parent bridge. */
907 get_bridge(context->func.parent);
908 acpi_unlock_hp_context();
909 }
910
911 /* Must be added to the list prior to calling acpiphp_add_context(). */
912 mutex_lock(&bridge_mutex);
913 list_add(&bridge->list, &bridge_list);
914 mutex_unlock(&bridge_mutex);
915
916 /* register all slot objects under this bridge */
917 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
918 acpiphp_add_context, NULL, bridge, NULL);
919 if (ACPI_FAILURE(status)) {
920 acpi_handle_err(handle, "failed to register slots\n");
921 cleanup_bridge(bridge);
922 put_bridge(bridge);
923 }
924}
925
926/**
927 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
928 * @bus: PCI bus to remove the slot objects for.
929 */
930void acpiphp_remove_slots(struct pci_bus *bus)
931{
932 struct acpiphp_bridge *bridge;
933
934 if (acpiphp_disabled)
935 return;
936
937 mutex_lock(&bridge_mutex);
938 list_for_each_entry(bridge, &bridge_list, list)
939 if (bridge->pci_bus == bus) {
940 mutex_unlock(&bridge_mutex);
941 cleanup_bridge(bridge);
942 put_bridge(bridge);
943 return;
944 }
945
946 mutex_unlock(&bridge_mutex);
947}
948
949/**
950 * acpiphp_enable_slot - power on slot
951 * @slot: ACPI PHP slot
952 */
953int acpiphp_enable_slot(struct acpiphp_slot *slot)
954{
955 pci_lock_rescan_remove();
956
957 if (slot->flags & SLOT_IS_GOING_AWAY)
958 return -ENODEV;
959
960 /* configure all functions */
961 if (!(slot->flags & SLOT_ENABLED))
962 enable_slot(slot);
963
964 pci_unlock_rescan_remove();
965 return 0;
966}
967
968/**
969 * acpiphp_disable_and_eject_slot - power off and eject slot
970 * @slot: ACPI PHP slot
971 */
972static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
973{
974 struct acpiphp_func *func;
975
976 if (slot->flags & SLOT_IS_GOING_AWAY)
977 return -ENODEV;
978
979 /* unconfigure all functions */
980 disable_slot(slot);
981
982 list_for_each_entry(func, &slot->funcs, sibling)
983 if (func->flags & FUNC_HAS_EJ0) {
984 acpi_handle handle = func_to_handle(func);
985
986 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
987 acpi_handle_err(handle, "_EJ0 failed\n");
988
989 break;
990 }
991
992 return 0;
993}
994
995int acpiphp_disable_slot(struct acpiphp_slot *slot)
996{
997 int ret;
998
999 /*
1000 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
1001 * acpiphp_disable_and_eject_slot() will be synchronized properly.
1002 */
1003 acpi_scan_lock_acquire();
1004 pci_lock_rescan_remove();
1005 ret = acpiphp_disable_and_eject_slot(slot);
1006 pci_unlock_rescan_remove();
1007 acpi_scan_lock_release();
1008 return ret;
1009}
1010
1011/*
1012 * slot enabled: 1
1013 * slot disabled: 0
1014 */
1015u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1016{
1017 return (slot->flags & SLOT_ENABLED);
1018}
1019
1020/*
1021 * latch open: 1
1022 * latch closed: 0
1023 */
1024u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1025{
1026 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1027}
1028
1029/*
1030 * adapter presence : 1
1031 * absence : 0
1032 */
1033u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1034{
1035 return !!get_slot_status(slot);
1036}
1/*
2 * ACPI PCI HotPlug glue functions to ACPI CA subsystem
3 *
4 * Copyright (C) 2002,2003 Takayoshi Kochi (t-kochi@bq.jp.nec.com)
5 * Copyright (C) 2002 Hiroshi Aono (h-aono@ap.jp.nec.com)
6 * Copyright (C) 2002,2003 NEC Corporation
7 * Copyright (C) 2003-2005 Matthew Wilcox (matthew.wilcox@hp.com)
8 * Copyright (C) 2003-2005 Hewlett Packard
9 * Copyright (C) 2005 Rajesh Shah (rajesh.shah@intel.com)
10 * Copyright (C) 2005 Intel Corporation
11 *
12 * All rights reserved.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or (at
17 * your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful, but
20 * WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
22 * NON INFRINGEMENT. See the GNU General Public License for more
23 * details.
24 *
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 *
29 * Send feedback to <kristen.c.accardi@intel.com>
30 *
31 */
32
33/*
34 * Lifetime rules for pci_dev:
35 * - The one in acpiphp_bridge has its refcount elevated by pci_get_slot()
36 * when the bridge is scanned and it loses a refcount when the bridge
37 * is removed.
38 * - When a P2P bridge is present, we elevate the refcount on the subordinate
39 * bus. It loses the refcount when the the driver unloads.
40 */
41
42#define pr_fmt(fmt) "acpiphp_glue: " fmt
43
44#include <linux/module.h>
45
46#include <linux/kernel.h>
47#include <linux/pci.h>
48#include <linux/pci_hotplug.h>
49#include <linux/pci-acpi.h>
50#include <linux/pm_runtime.h>
51#include <linux/mutex.h>
52#include <linux/slab.h>
53#include <linux/acpi.h>
54
55#include "../pci.h"
56#include "acpiphp.h"
57
58static LIST_HEAD(bridge_list);
59static DEFINE_MUTEX(bridge_mutex);
60
61static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type);
62static void acpiphp_post_dock_fixup(struct acpi_device *adev);
63static void acpiphp_sanitize_bus(struct pci_bus *bus);
64static void hotplug_event(u32 type, struct acpiphp_context *context);
65static void free_bridge(struct kref *kref);
66
67/**
68 * acpiphp_init_context - Create hotplug context and grab a reference to it.
69 * @adev: ACPI device object to create the context for.
70 *
71 * Call under acpi_hp_context_lock.
72 */
73static struct acpiphp_context *acpiphp_init_context(struct acpi_device *adev)
74{
75 struct acpiphp_context *context;
76
77 context = kzalloc(sizeof(*context), GFP_KERNEL);
78 if (!context)
79 return NULL;
80
81 context->refcount = 1;
82 context->hp.notify = acpiphp_hotplug_notify;
83 context->hp.fixup = acpiphp_post_dock_fixup;
84 acpi_set_hp_context(adev, &context->hp);
85 return context;
86}
87
88/**
89 * acpiphp_get_context - Get hotplug context and grab a reference to it.
90 * @adev: ACPI device object to get the context for.
91 *
92 * Call under acpi_hp_context_lock.
93 */
94static struct acpiphp_context *acpiphp_get_context(struct acpi_device *adev)
95{
96 struct acpiphp_context *context;
97
98 if (!adev->hp)
99 return NULL;
100
101 context = to_acpiphp_context(adev->hp);
102 context->refcount++;
103 return context;
104}
105
106/**
107 * acpiphp_put_context - Drop a reference to ACPI hotplug context.
108 * @context: ACPI hotplug context to drop a reference to.
109 *
110 * The context object is removed if there are no more references to it.
111 *
112 * Call under acpi_hp_context_lock.
113 */
114static void acpiphp_put_context(struct acpiphp_context *context)
115{
116 if (--context->refcount)
117 return;
118
119 WARN_ON(context->bridge);
120 context->hp.self->hp = NULL;
121 kfree(context);
122}
123
124static inline void get_bridge(struct acpiphp_bridge *bridge)
125{
126 kref_get(&bridge->ref);
127}
128
129static inline void put_bridge(struct acpiphp_bridge *bridge)
130{
131 kref_put(&bridge->ref, free_bridge);
132}
133
134static struct acpiphp_context *acpiphp_grab_context(struct acpi_device *adev)
135{
136 struct acpiphp_context *context;
137
138 acpi_lock_hp_context();
139 context = acpiphp_get_context(adev);
140 if (!context || context->func.parent->is_going_away) {
141 acpi_unlock_hp_context();
142 return NULL;
143 }
144 get_bridge(context->func.parent);
145 acpiphp_put_context(context);
146 acpi_unlock_hp_context();
147 return context;
148}
149
150static void acpiphp_let_context_go(struct acpiphp_context *context)
151{
152 put_bridge(context->func.parent);
153}
154
155static void free_bridge(struct kref *kref)
156{
157 struct acpiphp_context *context;
158 struct acpiphp_bridge *bridge;
159 struct acpiphp_slot *slot, *next;
160 struct acpiphp_func *func, *tmp;
161
162 acpi_lock_hp_context();
163
164 bridge = container_of(kref, struct acpiphp_bridge, ref);
165
166 list_for_each_entry_safe(slot, next, &bridge->slots, node) {
167 list_for_each_entry_safe(func, tmp, &slot->funcs, sibling)
168 acpiphp_put_context(func_to_context(func));
169
170 kfree(slot);
171 }
172
173 context = bridge->context;
174 /* Root bridges will not have hotplug context. */
175 if (context) {
176 /* Release the reference taken by acpiphp_enumerate_slots(). */
177 put_bridge(context->func.parent);
178 context->bridge = NULL;
179 acpiphp_put_context(context);
180 }
181
182 put_device(&bridge->pci_bus->dev);
183 pci_dev_put(bridge->pci_dev);
184 kfree(bridge);
185
186 acpi_unlock_hp_context();
187}
188
189/**
190 * acpiphp_post_dock_fixup - Post-dock fixups for PCI devices.
191 * @adev: ACPI device object corresponding to a PCI device.
192 *
193 * TBD - figure out a way to only call fixups for systems that require them.
194 */
195static void acpiphp_post_dock_fixup(struct acpi_device *adev)
196{
197 struct acpiphp_context *context = acpiphp_grab_context(adev);
198 struct pci_bus *bus;
199 u32 buses;
200
201 if (!context)
202 return;
203
204 bus = context->func.slot->bus;
205 if (!bus->self)
206 goto out;
207
208 /* fixup bad _DCK function that rewrites
209 * secondary bridge on slot
210 */
211 pci_read_config_dword(bus->self, PCI_PRIMARY_BUS, &buses);
212
213 if (((buses >> 8) & 0xff) != bus->busn_res.start) {
214 buses = (buses & 0xff000000)
215 | ((unsigned int)(bus->primary) << 0)
216 | ((unsigned int)(bus->busn_res.start) << 8)
217 | ((unsigned int)(bus->busn_res.end) << 16);
218 pci_write_config_dword(bus->self, PCI_PRIMARY_BUS, buses);
219 }
220
221 out:
222 acpiphp_let_context_go(context);
223}
224
225/* Check whether the PCI device is managed by native PCIe hotplug driver */
226static bool device_is_managed_by_native_pciehp(struct pci_dev *pdev)
227{
228 u32 reg32;
229 acpi_handle tmp;
230 struct acpi_pci_root *root;
231
232 /* Check whether the PCIe port supports native PCIe hotplug */
233 if (pcie_capability_read_dword(pdev, PCI_EXP_SLTCAP, ®32))
234 return false;
235 if (!(reg32 & PCI_EXP_SLTCAP_HPC))
236 return false;
237
238 /*
239 * Check whether native PCIe hotplug has been enabled for
240 * this PCIe hierarchy.
241 */
242 tmp = acpi_find_root_bridge_handle(pdev);
243 if (!tmp)
244 return false;
245 root = acpi_pci_find_root(tmp);
246 if (!root)
247 return false;
248 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))
249 return false;
250
251 return true;
252}
253
254/**
255 * acpiphp_add_context - Add ACPIPHP context to an ACPI device object.
256 * @handle: ACPI handle of the object to add a context to.
257 * @lvl: Not used.
258 * @data: The object's parent ACPIPHP bridge.
259 * @rv: Not used.
260 */
261static acpi_status acpiphp_add_context(acpi_handle handle, u32 lvl, void *data,
262 void **rv)
263{
264 struct acpiphp_bridge *bridge = data;
265 struct acpiphp_context *context;
266 struct acpi_device *adev;
267 struct acpiphp_slot *slot;
268 struct acpiphp_func *newfunc;
269 acpi_status status = AE_OK;
270 unsigned long long adr;
271 int device, function;
272 struct pci_bus *pbus = bridge->pci_bus;
273 struct pci_dev *pdev = bridge->pci_dev;
274 u32 val;
275
276 status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr);
277 if (ACPI_FAILURE(status)) {
278 if (status != AE_NOT_FOUND)
279 acpi_handle_warn(handle,
280 "can't evaluate _ADR (%#x)\n", status);
281 return AE_OK;
282 }
283 if (acpi_bus_get_device(handle, &adev))
284 return AE_OK;
285
286 device = (adr >> 16) & 0xffff;
287 function = adr & 0xffff;
288
289 acpi_lock_hp_context();
290 context = acpiphp_init_context(adev);
291 if (!context) {
292 acpi_unlock_hp_context();
293 acpi_handle_err(handle, "No hotplug context\n");
294 return AE_NOT_EXIST;
295 }
296 newfunc = &context->func;
297 newfunc->function = function;
298 newfunc->parent = bridge;
299 acpi_unlock_hp_context();
300
301 /*
302 * If this is a dock device, its _EJ0 should be executed by the dock
303 * notify handler after calling _DCK.
304 */
305 if (!is_dock_device(adev) && acpi_has_method(handle, "_EJ0"))
306 newfunc->flags = FUNC_HAS_EJ0;
307
308 if (acpi_has_method(handle, "_STA"))
309 newfunc->flags |= FUNC_HAS_STA;
310
311 /* search for objects that share the same slot */
312 list_for_each_entry(slot, &bridge->slots, node)
313 if (slot->device == device)
314 goto slot_found;
315
316 slot = kzalloc(sizeof(struct acpiphp_slot), GFP_KERNEL);
317 if (!slot) {
318 acpi_lock_hp_context();
319 acpiphp_put_context(context);
320 acpi_unlock_hp_context();
321 return AE_NO_MEMORY;
322 }
323
324 slot->bus = bridge->pci_bus;
325 slot->device = device;
326 INIT_LIST_HEAD(&slot->funcs);
327
328 list_add_tail(&slot->node, &bridge->slots);
329
330 /*
331 * Expose slots to user space for functions that have _EJ0 or _RMV or
332 * are located in dock stations. Do not expose them for devices handled
333 * by the native PCIe hotplug (PCIeHP), becuase that code is supposed to
334 * expose slots to user space in those cases.
335 */
336 if ((acpi_pci_check_ejectable(pbus, handle) || is_dock_device(adev))
337 && !(pdev && device_is_managed_by_native_pciehp(pdev))) {
338 unsigned long long sun;
339 int retval;
340
341 bridge->nr_slots++;
342 status = acpi_evaluate_integer(handle, "_SUN", NULL, &sun);
343 if (ACPI_FAILURE(status))
344 sun = bridge->nr_slots;
345
346 pr_debug("found ACPI PCI Hotplug slot %llu at PCI %04x:%02x:%02x\n",
347 sun, pci_domain_nr(pbus), pbus->number, device);
348
349 retval = acpiphp_register_hotplug_slot(slot, sun);
350 if (retval) {
351 slot->slot = NULL;
352 bridge->nr_slots--;
353 if (retval == -EBUSY)
354 pr_warn("Slot %llu already registered by another hotplug driver\n", sun);
355 else
356 pr_warn("acpiphp_register_hotplug_slot failed (err code = 0x%x)\n", retval);
357 }
358 /* Even if the slot registration fails, we can still use it. */
359 }
360
361 slot_found:
362 newfunc->slot = slot;
363 list_add_tail(&newfunc->sibling, &slot->funcs);
364
365 if (pci_bus_read_dev_vendor_id(pbus, PCI_DEVFN(device, function),
366 &val, 60*1000))
367 slot->flags |= SLOT_ENABLED;
368
369 return AE_OK;
370}
371
372static void cleanup_bridge(struct acpiphp_bridge *bridge)
373{
374 struct acpiphp_slot *slot;
375 struct acpiphp_func *func;
376
377 list_for_each_entry(slot, &bridge->slots, node) {
378 list_for_each_entry(func, &slot->funcs, sibling) {
379 struct acpi_device *adev = func_to_acpi_device(func);
380
381 acpi_lock_hp_context();
382 adev->hp->notify = NULL;
383 adev->hp->fixup = NULL;
384 acpi_unlock_hp_context();
385 }
386 slot->flags |= SLOT_IS_GOING_AWAY;
387 if (slot->slot)
388 acpiphp_unregister_hotplug_slot(slot);
389 }
390
391 mutex_lock(&bridge_mutex);
392 list_del(&bridge->list);
393 mutex_unlock(&bridge_mutex);
394
395 acpi_lock_hp_context();
396 bridge->is_going_away = true;
397 acpi_unlock_hp_context();
398}
399
400/**
401 * acpiphp_max_busnr - return the highest reserved bus number under the given bus.
402 * @bus: bus to start search with
403 */
404static unsigned char acpiphp_max_busnr(struct pci_bus *bus)
405{
406 struct pci_bus *tmp;
407 unsigned char max, n;
408
409 /*
410 * pci_bus_max_busnr will return the highest
411 * reserved busnr for all these children.
412 * that is equivalent to the bus->subordinate
413 * value. We don't want to use the parent's
414 * bus->subordinate value because it could have
415 * padding in it.
416 */
417 max = bus->busn_res.start;
418
419 list_for_each_entry(tmp, &bus->children, node) {
420 n = pci_bus_max_busnr(tmp);
421 if (n > max)
422 max = n;
423 }
424 return max;
425}
426
427static void acpiphp_set_acpi_region(struct acpiphp_slot *slot)
428{
429 struct acpiphp_func *func;
430 union acpi_object params[2];
431 struct acpi_object_list arg_list;
432
433 list_for_each_entry(func, &slot->funcs, sibling) {
434 arg_list.count = 2;
435 arg_list.pointer = params;
436 params[0].type = ACPI_TYPE_INTEGER;
437 params[0].integer.value = ACPI_ADR_SPACE_PCI_CONFIG;
438 params[1].type = ACPI_TYPE_INTEGER;
439 params[1].integer.value = 1;
440 /* _REG is optional, we don't care about if there is failure */
441 acpi_evaluate_object(func_to_handle(func), "_REG", &arg_list,
442 NULL);
443 }
444}
445
446static void check_hotplug_bridge(struct acpiphp_slot *slot, struct pci_dev *dev)
447{
448 struct acpiphp_func *func;
449
450 /* quirk, or pcie could set it already */
451 if (dev->is_hotplug_bridge)
452 return;
453
454 list_for_each_entry(func, &slot->funcs, sibling) {
455 if (PCI_FUNC(dev->devfn) == func->function) {
456 dev->is_hotplug_bridge = 1;
457 break;
458 }
459 }
460}
461
462static int acpiphp_rescan_slot(struct acpiphp_slot *slot)
463{
464 struct acpiphp_func *func;
465
466 list_for_each_entry(func, &slot->funcs, sibling) {
467 struct acpi_device *adev = func_to_acpi_device(func);
468
469 acpi_bus_scan(adev->handle);
470 if (acpi_device_enumerated(adev))
471 acpi_device_set_power(adev, ACPI_STATE_D0);
472 }
473 return pci_scan_slot(slot->bus, PCI_DEVFN(slot->device, 0));
474}
475
476/**
477 * enable_slot - enable, configure a slot
478 * @slot: slot to be enabled
479 *
480 * This function should be called per *physical slot*,
481 * not per each slot object in ACPI namespace.
482 */
483static void enable_slot(struct acpiphp_slot *slot)
484{
485 struct pci_dev *dev;
486 struct pci_bus *bus = slot->bus;
487 struct acpiphp_func *func;
488 int max, pass;
489 LIST_HEAD(add_list);
490
491 acpiphp_rescan_slot(slot);
492 max = acpiphp_max_busnr(bus);
493 for (pass = 0; pass < 2; pass++) {
494 list_for_each_entry(dev, &bus->devices, bus_list) {
495 if (PCI_SLOT(dev->devfn) != slot->device)
496 continue;
497
498 if (pci_is_bridge(dev)) {
499 max = pci_scan_bridge(bus, dev, max, pass);
500 if (pass && dev->subordinate) {
501 check_hotplug_bridge(slot, dev);
502 pcibios_resource_survey_bus(dev->subordinate);
503 __pci_bus_size_bridges(dev->subordinate,
504 &add_list);
505 }
506 }
507 }
508 }
509 __pci_bus_assign_resources(bus, &add_list, NULL);
510
511 acpiphp_sanitize_bus(bus);
512 pcie_bus_configure_settings(bus);
513 acpiphp_set_acpi_region(slot);
514
515 list_for_each_entry(dev, &bus->devices, bus_list) {
516 /* Assume that newly added devices are powered on already. */
517 if (!dev->is_added)
518 dev->current_state = PCI_D0;
519 }
520
521 pci_bus_add_devices(bus);
522
523 slot->flags |= SLOT_ENABLED;
524 list_for_each_entry(func, &slot->funcs, sibling) {
525 dev = pci_get_slot(bus, PCI_DEVFN(slot->device,
526 func->function));
527 if (!dev) {
528 /* Do not set SLOT_ENABLED flag if some funcs
529 are not added. */
530 slot->flags &= (~SLOT_ENABLED);
531 continue;
532 }
533 }
534}
535
536/**
537 * disable_slot - disable a slot
538 * @slot: ACPI PHP slot
539 */
540static void disable_slot(struct acpiphp_slot *slot)
541{
542 struct pci_bus *bus = slot->bus;
543 struct pci_dev *dev, *prev;
544 struct acpiphp_func *func;
545
546 /*
547 * enable_slot() enumerates all functions in this device via
548 * pci_scan_slot(), whether they have associated ACPI hotplug
549 * methods (_EJ0, etc.) or not. Therefore, we remove all functions
550 * here.
551 */
552 list_for_each_entry_safe_reverse(dev, prev, &bus->devices, bus_list)
553 if (PCI_SLOT(dev->devfn) == slot->device)
554 pci_stop_and_remove_bus_device(dev);
555
556 list_for_each_entry(func, &slot->funcs, sibling)
557 acpi_bus_trim(func_to_acpi_device(func));
558
559 slot->flags &= (~SLOT_ENABLED);
560}
561
562static bool slot_no_hotplug(struct acpiphp_slot *slot)
563{
564 struct pci_bus *bus = slot->bus;
565 struct pci_dev *dev;
566
567 list_for_each_entry(dev, &bus->devices, bus_list) {
568 if (PCI_SLOT(dev->devfn) == slot->device && dev->ignore_hotplug)
569 return true;
570 }
571 return false;
572}
573
574/**
575 * get_slot_status - get ACPI slot status
576 * @slot: ACPI PHP slot
577 *
578 * If a slot has _STA for each function and if any one of them
579 * returned non-zero status, return it.
580 *
581 * If a slot doesn't have _STA and if any one of its functions'
582 * configuration space is configured, return 0x0f as a _STA.
583 *
584 * Otherwise return 0.
585 */
586static unsigned int get_slot_status(struct acpiphp_slot *slot)
587{
588 unsigned long long sta = 0;
589 struct acpiphp_func *func;
590
591 list_for_each_entry(func, &slot->funcs, sibling) {
592 if (func->flags & FUNC_HAS_STA) {
593 acpi_status status;
594
595 status = acpi_evaluate_integer(func_to_handle(func),
596 "_STA", NULL, &sta);
597 if (ACPI_SUCCESS(status) && sta)
598 break;
599 } else {
600 u32 dvid;
601
602 pci_bus_read_config_dword(slot->bus,
603 PCI_DEVFN(slot->device,
604 func->function),
605 PCI_VENDOR_ID, &dvid);
606 if (dvid != 0xffffffff) {
607 sta = ACPI_STA_ALL;
608 break;
609 }
610 }
611 }
612
613 return (unsigned int)sta;
614}
615
616static inline bool device_status_valid(unsigned int sta)
617{
618 /*
619 * ACPI spec says that _STA may return bit 0 clear with bit 3 set
620 * if the device is valid but does not require a device driver to be
621 * loaded (Section 6.3.7 of ACPI 5.0A).
622 */
623 unsigned int mask = ACPI_STA_DEVICE_ENABLED | ACPI_STA_DEVICE_FUNCTIONING;
624 return (sta & mask) == mask;
625}
626
627/**
628 * trim_stale_devices - remove PCI devices that are not responding.
629 * @dev: PCI device to start walking the hierarchy from.
630 */
631static void trim_stale_devices(struct pci_dev *dev)
632{
633 struct acpi_device *adev = ACPI_COMPANION(&dev->dev);
634 struct pci_bus *bus = dev->subordinate;
635 bool alive = dev->ignore_hotplug;
636
637 if (adev) {
638 acpi_status status;
639 unsigned long long sta;
640
641 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
642 alive = alive || (ACPI_SUCCESS(status) && device_status_valid(sta));
643 }
644 if (!alive)
645 alive = pci_device_is_present(dev);
646
647 if (!alive) {
648 pci_stop_and_remove_bus_device(dev);
649 if (adev)
650 acpi_bus_trim(adev);
651 } else if (bus) {
652 struct pci_dev *child, *tmp;
653
654 /* The device is a bridge. so check the bus below it. */
655 pm_runtime_get_sync(&dev->dev);
656 list_for_each_entry_safe_reverse(child, tmp, &bus->devices, bus_list)
657 trim_stale_devices(child);
658
659 pm_runtime_put(&dev->dev);
660 }
661}
662
663/**
664 * acpiphp_check_bridge - re-enumerate devices
665 * @bridge: where to begin re-enumeration
666 *
667 * Iterate over all slots under this bridge and make sure that if a
668 * card is present they are enabled, and if not they are disabled.
669 */
670static void acpiphp_check_bridge(struct acpiphp_bridge *bridge)
671{
672 struct acpiphp_slot *slot;
673
674 /* Bail out if the bridge is going away. */
675 if (bridge->is_going_away)
676 return;
677
678 list_for_each_entry(slot, &bridge->slots, node) {
679 struct pci_bus *bus = slot->bus;
680 struct pci_dev *dev, *tmp;
681
682 if (slot_no_hotplug(slot)) {
683 ; /* do nothing */
684 } else if (device_status_valid(get_slot_status(slot))) {
685 /* remove stale devices if any */
686 list_for_each_entry_safe_reverse(dev, tmp,
687 &bus->devices, bus_list)
688 if (PCI_SLOT(dev->devfn) == slot->device)
689 trim_stale_devices(dev);
690
691 /* configure all functions */
692 enable_slot(slot);
693 } else {
694 disable_slot(slot);
695 }
696 }
697}
698
699/*
700 * Remove devices for which we could not assign resources, call
701 * arch specific code to fix-up the bus
702 */
703static void acpiphp_sanitize_bus(struct pci_bus *bus)
704{
705 struct pci_dev *dev, *tmp;
706 int i;
707 unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
708
709 list_for_each_entry_safe_reverse(dev, tmp, &bus->devices, bus_list) {
710 for (i = 0; i < PCI_BRIDGE_RESOURCES; i++) {
711 struct resource *res = &dev->resource[i];
712 if ((res->flags & type_mask) && !res->start &&
713 res->end) {
714 /* Could not assign a required resources
715 * for this device, remove it */
716 pci_stop_and_remove_bus_device(dev);
717 break;
718 }
719 }
720 }
721}
722
723/*
724 * ACPI event handlers
725 */
726
727void acpiphp_check_host_bridge(struct acpi_device *adev)
728{
729 struct acpiphp_bridge *bridge = NULL;
730
731 acpi_lock_hp_context();
732 if (adev->hp) {
733 bridge = to_acpiphp_root_context(adev->hp)->root_bridge;
734 if (bridge)
735 get_bridge(bridge);
736 }
737 acpi_unlock_hp_context();
738 if (bridge) {
739 pci_lock_rescan_remove();
740
741 acpiphp_check_bridge(bridge);
742
743 pci_unlock_rescan_remove();
744 put_bridge(bridge);
745 }
746}
747
748static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot);
749
750static void hotplug_event(u32 type, struct acpiphp_context *context)
751{
752 acpi_handle handle = context->hp.self->handle;
753 struct acpiphp_func *func = &context->func;
754 struct acpiphp_slot *slot = func->slot;
755 struct acpiphp_bridge *bridge;
756
757 acpi_lock_hp_context();
758 bridge = context->bridge;
759 if (bridge)
760 get_bridge(bridge);
761
762 acpi_unlock_hp_context();
763
764 pci_lock_rescan_remove();
765
766 switch (type) {
767 case ACPI_NOTIFY_BUS_CHECK:
768 /* bus re-enumerate */
769 acpi_handle_debug(handle, "Bus check in %s()\n", __func__);
770 if (bridge)
771 acpiphp_check_bridge(bridge);
772 else if (!(slot->flags & SLOT_IS_GOING_AWAY))
773 enable_slot(slot);
774
775 break;
776
777 case ACPI_NOTIFY_DEVICE_CHECK:
778 /* device check */
779 acpi_handle_debug(handle, "Device check in %s()\n", __func__);
780 if (bridge) {
781 acpiphp_check_bridge(bridge);
782 } else if (!(slot->flags & SLOT_IS_GOING_AWAY)) {
783 /*
784 * Check if anything has changed in the slot and rescan
785 * from the parent if that's the case.
786 */
787 if (acpiphp_rescan_slot(slot))
788 acpiphp_check_bridge(func->parent);
789 }
790 break;
791
792 case ACPI_NOTIFY_EJECT_REQUEST:
793 /* request device eject */
794 acpi_handle_debug(handle, "Eject request in %s()\n", __func__);
795 acpiphp_disable_and_eject_slot(slot);
796 break;
797 }
798
799 pci_unlock_rescan_remove();
800 if (bridge)
801 put_bridge(bridge);
802}
803
804static int acpiphp_hotplug_notify(struct acpi_device *adev, u32 type)
805{
806 struct acpiphp_context *context;
807
808 context = acpiphp_grab_context(adev);
809 if (!context)
810 return -ENODATA;
811
812 hotplug_event(type, context);
813 acpiphp_let_context_go(context);
814 return 0;
815}
816
817/**
818 * acpiphp_enumerate_slots - Enumerate PCI slots for a given bus.
819 * @bus: PCI bus to enumerate the slots for.
820 *
821 * A "slot" is an object associated with a PCI device number. All functions
822 * (PCI devices) with the same bus and device number belong to the same slot.
823 */
824void acpiphp_enumerate_slots(struct pci_bus *bus)
825{
826 struct acpiphp_bridge *bridge;
827 struct acpi_device *adev;
828 acpi_handle handle;
829 acpi_status status;
830
831 if (acpiphp_disabled)
832 return;
833
834 adev = ACPI_COMPANION(bus->bridge);
835 if (!adev)
836 return;
837
838 handle = adev->handle;
839 bridge = kzalloc(sizeof(struct acpiphp_bridge), GFP_KERNEL);
840 if (!bridge) {
841 acpi_handle_err(handle, "No memory for bridge object\n");
842 return;
843 }
844
845 INIT_LIST_HEAD(&bridge->slots);
846 kref_init(&bridge->ref);
847 bridge->pci_dev = pci_dev_get(bus->self);
848 bridge->pci_bus = bus;
849
850 /*
851 * Grab a ref to the subordinate PCI bus in case the bus is
852 * removed via PCI core logical hotplug. The ref pins the bus
853 * (which we access during module unload).
854 */
855 get_device(&bus->dev);
856
857 acpi_lock_hp_context();
858 if (pci_is_root_bus(bridge->pci_bus)) {
859 struct acpiphp_root_context *root_context;
860
861 root_context = kzalloc(sizeof(*root_context), GFP_KERNEL);
862 if (!root_context)
863 goto err;
864
865 root_context->root_bridge = bridge;
866 acpi_set_hp_context(adev, &root_context->hp);
867 } else {
868 struct acpiphp_context *context;
869
870 /*
871 * This bridge should have been registered as a hotplug function
872 * under its parent, so the context should be there, unless the
873 * parent is going to be handled by pciehp, in which case this
874 * bridge is not interesting to us either.
875 */
876 context = acpiphp_get_context(adev);
877 if (!context)
878 goto err;
879
880 bridge->context = context;
881 context->bridge = bridge;
882 /* Get a reference to the parent bridge. */
883 get_bridge(context->func.parent);
884 }
885 acpi_unlock_hp_context();
886
887 /* Must be added to the list prior to calling acpiphp_add_context(). */
888 mutex_lock(&bridge_mutex);
889 list_add(&bridge->list, &bridge_list);
890 mutex_unlock(&bridge_mutex);
891
892 /* register all slot objects under this bridge */
893 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
894 acpiphp_add_context, NULL, bridge, NULL);
895 if (ACPI_FAILURE(status)) {
896 acpi_handle_err(handle, "failed to register slots\n");
897 cleanup_bridge(bridge);
898 put_bridge(bridge);
899 }
900 return;
901
902 err:
903 acpi_unlock_hp_context();
904 put_device(&bus->dev);
905 pci_dev_put(bridge->pci_dev);
906 kfree(bridge);
907}
908
909static void acpiphp_drop_bridge(struct acpiphp_bridge *bridge)
910{
911 if (pci_is_root_bus(bridge->pci_bus)) {
912 struct acpiphp_root_context *root_context;
913 struct acpi_device *adev;
914
915 acpi_lock_hp_context();
916 adev = ACPI_COMPANION(bridge->pci_bus->bridge);
917 root_context = to_acpiphp_root_context(adev->hp);
918 adev->hp = NULL;
919 acpi_unlock_hp_context();
920 kfree(root_context);
921 }
922 cleanup_bridge(bridge);
923 put_bridge(bridge);
924}
925
926/**
927 * acpiphp_remove_slots - Remove slot objects associated with a given bus.
928 * @bus: PCI bus to remove the slot objects for.
929 */
930void acpiphp_remove_slots(struct pci_bus *bus)
931{
932 struct acpiphp_bridge *bridge;
933
934 if (acpiphp_disabled)
935 return;
936
937 mutex_lock(&bridge_mutex);
938 list_for_each_entry(bridge, &bridge_list, list)
939 if (bridge->pci_bus == bus) {
940 mutex_unlock(&bridge_mutex);
941 acpiphp_drop_bridge(bridge);
942 return;
943 }
944
945 mutex_unlock(&bridge_mutex);
946}
947
948/**
949 * acpiphp_enable_slot - power on slot
950 * @slot: ACPI PHP slot
951 */
952int acpiphp_enable_slot(struct acpiphp_slot *slot)
953{
954 pci_lock_rescan_remove();
955
956 if (slot->flags & SLOT_IS_GOING_AWAY) {
957 pci_unlock_rescan_remove();
958 return -ENODEV;
959 }
960
961 /* configure all functions */
962 if (!(slot->flags & SLOT_ENABLED))
963 enable_slot(slot);
964
965 pci_unlock_rescan_remove();
966 return 0;
967}
968
969/**
970 * acpiphp_disable_and_eject_slot - power off and eject slot
971 * @slot: ACPI PHP slot
972 */
973static int acpiphp_disable_and_eject_slot(struct acpiphp_slot *slot)
974{
975 struct acpiphp_func *func;
976
977 if (slot->flags & SLOT_IS_GOING_AWAY)
978 return -ENODEV;
979
980 /* unconfigure all functions */
981 disable_slot(slot);
982
983 list_for_each_entry(func, &slot->funcs, sibling)
984 if (func->flags & FUNC_HAS_EJ0) {
985 acpi_handle handle = func_to_handle(func);
986
987 if (ACPI_FAILURE(acpi_evaluate_ej0(handle)))
988 acpi_handle_err(handle, "_EJ0 failed\n");
989
990 break;
991 }
992
993 return 0;
994}
995
996int acpiphp_disable_slot(struct acpiphp_slot *slot)
997{
998 int ret;
999
1000 /*
1001 * Acquire acpi_scan_lock to ensure that the execution of _EJ0 in
1002 * acpiphp_disable_and_eject_slot() will be synchronized properly.
1003 */
1004 acpi_scan_lock_acquire();
1005 pci_lock_rescan_remove();
1006 ret = acpiphp_disable_and_eject_slot(slot);
1007 pci_unlock_rescan_remove();
1008 acpi_scan_lock_release();
1009 return ret;
1010}
1011
1012/*
1013 * slot enabled: 1
1014 * slot disabled: 0
1015 */
1016u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
1017{
1018 return (slot->flags & SLOT_ENABLED);
1019}
1020
1021/*
1022 * latch open: 1
1023 * latch closed: 0
1024 */
1025u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
1026{
1027 return !(get_slot_status(slot) & ACPI_STA_DEVICE_UI);
1028}
1029
1030/*
1031 * adapter presence : 1
1032 * absence : 0
1033 */
1034u8 acpiphp_get_adapter_status(struct acpiphp_slot *slot)
1035{
1036 return !!get_slot_status(slot);
1037}