Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/acpi/pci_root.c

  1 /*
  2  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
  3  *
  4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  6  *
  7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  8  *
  9  *  This program is free software; you can redistribute it and/or modify
 10  *  it under the terms of the GNU General Public License as published by
 11  *  the Free Software Foundation; either version 2 of the License, or (at
 12  *  your option) any later version.
 13  *
 14  *  This program is distributed in the hope that it will be useful, but
 15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
 16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 17  *  General Public License for more details.
 18  *
 19  *  You should have received a copy of the GNU General Public License along
 20  *  with this program; if not, write to the Free Software Foundation, Inc.,
 21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 22  *
 23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 24  */
 25 
 26 #include <linux/kernel.h>
 27 #include <linux/module.h>
 28 #include <linux/init.h>
 29 #include <linux/types.h>
 30 #include <linux/mutex.h>
 31 #include <linux/pm.h>
 32 #include <linux/pm_runtime.h>
 33 #include <linux/pci.h>
 34 #include <linux/pci-acpi.h>
 35 #include <linux/pci-aspm.h>
 36 #include <linux/dmar.h>
 37 #include <linux/acpi.h>
 38 #include <linux/slab.h>
 39 #include <linux/dmi.h>
 40 #include <acpi/apei.h>  /* for acpi_hest_init() */
 41 
 42 #include "internal.h"
 43 
 44 #define _COMPONENT              ACPI_PCI_COMPONENT
 45 ACPI_MODULE_NAME("pci_root");
 46 #define ACPI_PCI_ROOT_CLASS             "pci_bridge"
 47 #define ACPI_PCI_ROOT_DEVICE_NAME       "PCI Root Bridge"
 48 static int acpi_pci_root_add(struct acpi_device *device,
 49                              const struct acpi_device_id *not_used);
 50 static void acpi_pci_root_remove(struct acpi_device *device);
 51 
 52 static int acpi_pci_root_scan_dependent(struct acpi_device *adev)
 53 {
 54         acpiphp_check_host_bridge(adev);
 55         return 0;
 56 }
 57 
 58 #define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \
 59                                 | OSC_PCI_ASPM_SUPPORT \
 60                                 | OSC_PCI_CLOCK_PM_SUPPORT \
 61                                 | OSC_PCI_MSI_SUPPORT)
 62 
 63 static const struct acpi_device_id root_device_ids[] = {
 64         {"PNP0A03", 0},
 65         {"", 0},
 66 };
 67 
 68 static struct acpi_scan_handler pci_root_handler = {
 69         .ids = root_device_ids,
 70         .attach = acpi_pci_root_add,
 71         .detach = acpi_pci_root_remove,
 72         .hotplug = {
 73                 .enabled = true,
 74                 .scan_dependent = acpi_pci_root_scan_dependent,
 75         },
 76 };
 77 
 78 static DEFINE_MUTEX(osc_lock);
 79 
 80 /**
 81  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
 82  * @handle - the ACPI CA node in question.
 83  *
 84  * Note: we could make this API take a struct acpi_device * instead, but
 85  * for now, it's more convenient to operate on an acpi_handle.
 86  */
 87 int acpi_is_root_bridge(acpi_handle handle)
 88 {
 89         int ret;
 90         struct acpi_device *device;
 91 
 92         ret = acpi_bus_get_device(handle, &device);
 93         if (ret)
 94                 return 0;
 95 
 96         ret = acpi_match_device_ids(device, root_device_ids);
 97         if (ret)
 98                 return 0;
 99         else
100                 return 1;
101 }
102 EXPORT_SYMBOL_GPL(acpi_is_root_bridge);
103 
104 static acpi_status
105 get_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
106 {
107         struct resource *res = data;
108         struct acpi_resource_address64 address;
109         acpi_status status;
110 
111         status = acpi_resource_to_address64(resource, &address);
112         if (ACPI_FAILURE(status))
113                 return AE_OK;
114 
115         if ((address.address.address_length > 0) &&
116             (address.resource_type == ACPI_BUS_NUMBER_RANGE)) {
117                 res->start = address.address.minimum;
118                 res->end = address.address.minimum + address.address.address_length - 1;
119         }
120 
121         return AE_OK;
122 }
123 
124 static acpi_status try_get_root_bridge_busnr(acpi_handle handle,
125                                              struct resource *res)
126 {
127         acpi_status status;
128 
129         res->start = -1;
130         status =
131             acpi_walk_resources(handle, METHOD_NAME__CRS,
132                                 get_root_bridge_busnr_callback, res);
133         if (ACPI_FAILURE(status))
134                 return status;
135         if (res->start == -1)
136                 return AE_ERROR;
137         return AE_OK;
138 }
139 
140 struct pci_osc_bit_struct {
141         u32 bit;
142         char *desc;
143 };
144 
145 static struct pci_osc_bit_struct pci_osc_support_bit[] = {
146         { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" },
147         { OSC_PCI_ASPM_SUPPORT, "ASPM" },
148         { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" },
149         { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" },
150         { OSC_PCI_MSI_SUPPORT, "MSI" },
151 };
152 
153 static struct pci_osc_bit_struct pci_osc_control_bit[] = {
154         { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" },
155         { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" },
156         { OSC_PCI_EXPRESS_PME_CONTROL, "PME" },
157         { OSC_PCI_EXPRESS_AER_CONTROL, "AER" },
158         { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" },
159 };
160 
161 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,
162                             struct pci_osc_bit_struct *table, int size)
163 {
164         char buf[80];
165         int i, len = 0;
166         struct pci_osc_bit_struct *entry;
167 
168         buf[0] = '\0';
169         for (i = 0, entry = table; i < size; i++, entry++)
170                 if (word & entry->bit)
171                         len += snprintf(buf + len, sizeof(buf) - len, "%s%s",
172                                         len ? " " : "", entry->desc);
173 
174         dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);
175 }
176 
177 static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)
178 {
179         decode_osc_bits(root, msg, word, pci_osc_support_bit,
180                         ARRAY_SIZE(pci_osc_support_bit));
181 }
182 
183 static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)
184 {
185         decode_osc_bits(root, msg, word, pci_osc_control_bit,
186                         ARRAY_SIZE(pci_osc_control_bit));
187 }
188 
189 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
190 
191 static acpi_status acpi_pci_run_osc(acpi_handle handle,
192                                     const u32 *capbuf, u32 *retval)
193 {
194         struct acpi_osc_context context = {
195                 .uuid_str = pci_osc_uuid_str,
196                 .rev = 1,
197                 .cap.length = 12,
198                 .cap.pointer = (void *)capbuf,
199         };
200         acpi_status status;
201 
202         status = acpi_run_osc(handle, &context);
203         if (ACPI_SUCCESS(status)) {
204                 *retval = *((u32 *)(context.ret.pointer + 8));
205                 kfree(context.ret.pointer);
206         }
207         return status;
208 }
209 
210 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,
211                                         u32 support,
212                                         u32 *control)
213 {
214         acpi_status status;
215         u32 result, capbuf[3];
216 
217         support &= OSC_PCI_SUPPORT_MASKS;
218         support |= root->osc_support_set;
219 
220         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
221         capbuf[OSC_SUPPORT_DWORD] = support;
222         if (control) {
223                 *control &= OSC_PCI_CONTROL_MASKS;
224                 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;
225         } else {
226                 /* Run _OSC query only with existing controls. */
227                 capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;
228         }
229 
230         status = acpi_pci_run_osc(root->device->handle, capbuf, &result);
231         if (ACPI_SUCCESS(status)) {
232                 root->osc_support_set = support;
233                 if (control)
234                         *control = result;
235         }
236         return status;
237 }
238 
239 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)
240 {
241         acpi_status status;
242 
243         mutex_lock(&osc_lock);
244         status = acpi_pci_query_osc(root, flags, NULL);
245         mutex_unlock(&osc_lock);
246         return status;
247 }
248 
249 struct acpi_pci_root *acpi_pci_find_root(acpi_handle handle)
250 {
251         struct acpi_pci_root *root;
252         struct acpi_device *device;
253 
254         if (acpi_bus_get_device(handle, &device) ||
255             acpi_match_device_ids(device, root_device_ids))
256                 return NULL;
257 
258         root = acpi_driver_data(device);
259 
260         return root;
261 }
262 EXPORT_SYMBOL_GPL(acpi_pci_find_root);
263 
264 struct acpi_handle_node {
265         struct list_head node;
266         acpi_handle handle;
267 };
268 
269 /**
270  * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
271  * @handle: the handle in question
272  *
273  * Given an ACPI CA handle, the desired PCI device is located in the
274  * list of PCI devices.
275  *
276  * If the device is found, its reference count is increased and this
277  * function returns a pointer to its data structure.  The caller must
278  * decrement the reference count by calling pci_dev_put().
279  * If no device is found, %NULL is returned.
280  */
281 struct pci_dev *acpi_get_pci_dev(acpi_handle handle)
282 {
283         int dev, fn;
284         unsigned long long adr;
285         acpi_status status;
286         acpi_handle phandle;
287         struct pci_bus *pbus;
288         struct pci_dev *pdev = NULL;
289         struct acpi_handle_node *node, *tmp;
290         struct acpi_pci_root *root;
291         LIST_HEAD(device_list);
292 
293         /*
294          * Walk up the ACPI CA namespace until we reach a PCI root bridge.
295          */
296         phandle = handle;
297         while (!acpi_is_root_bridge(phandle)) {
298                 node = kzalloc(sizeof(struct acpi_handle_node), GFP_KERNEL);
299                 if (!node)
300                         goto out;
301 
302                 INIT_LIST_HEAD(&node->node);
303                 node->handle = phandle;
304                 list_add(&node->node, &device_list);
305 
306                 status = acpi_get_parent(phandle, &phandle);
307                 if (ACPI_FAILURE(status))
308                         goto out;
309         }
310 
311         root = acpi_pci_find_root(phandle);
312         if (!root)
313                 goto out;
314 
315         pbus = root->bus;
316 
317         /*
318          * Now, walk back down the PCI device tree until we return to our
319          * original handle. Assumes that everything between the PCI root
320          * bridge and the device we're looking for must be a P2P bridge.
321          */
322         list_for_each_entry(node, &device_list, node) {
323                 acpi_handle hnd = node->handle;
324                 status = acpi_evaluate_integer(hnd, "_ADR", NULL, &adr);
325                 if (ACPI_FAILURE(status))
326                         goto out;
327                 dev = (adr >> 16) & 0xffff;
328                 fn  = adr & 0xffff;
329 
330                 pdev = pci_get_slot(pbus, PCI_DEVFN(dev, fn));
331                 if (!pdev || hnd == handle)
332                         break;
333 
334                 pbus = pdev->subordinate;
335                 pci_dev_put(pdev);
336 
337                 /*
338                  * This function may be called for a non-PCI device that has a
339                  * PCI parent (eg. a disk under a PCI SATA controller).  In that
340                  * case pdev->subordinate will be NULL for the parent.
341                  */
342                 if (!pbus) {
343                         dev_dbg(&pdev->dev, "Not a PCI-to-PCI bridge\n");
344                         pdev = NULL;
345                         break;
346                 }
347         }
348 out:
349         list_for_each_entry_safe(node, tmp, &device_list, node)
350                 kfree(node);
351 
352         return pdev;
353 }
354 EXPORT_SYMBOL_GPL(acpi_get_pci_dev);
355 
356 /**
357  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
358  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
359  * @mask: Mask of _OSC bits to request control of, place to store control mask.
360  * @req: Mask of _OSC bits the control of is essential to the caller.
361  *
362  * Run _OSC query for @mask and if that is successful, compare the returned
363  * mask of control bits with @req.  If all of the @req bits are set in the
364  * returned mask, run _OSC request for it.
365  *
366  * The variable at the @mask address may be modified regardless of whether or
367  * not the function returns success.  On success it will contain the mask of
368  * _OSC bits the BIOS has granted control of, but its contents are meaningless
369  * on failure.
370  **/
371 acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req)
372 {
373         struct acpi_pci_root *root;
374         acpi_status status = AE_OK;
375         u32 ctrl, capbuf[3];
376 
377         if (!mask)
378                 return AE_BAD_PARAMETER;
379 
380         ctrl = *mask & OSC_PCI_CONTROL_MASKS;
381         if ((ctrl & req) != req)
382                 return AE_TYPE;
383 
384         root = acpi_pci_find_root(handle);
385         if (!root)
386                 return AE_NOT_EXIST;
387 
388         mutex_lock(&osc_lock);
389 
390         *mask = ctrl | root->osc_control_set;
391         /* No need to evaluate _OSC if the control was already granted. */
392         if ((root->osc_control_set & ctrl) == ctrl)
393                 goto out;
394 
395         /* Need to check the available controls bits before requesting them. */
396         while (*mask) {
397                 status = acpi_pci_query_osc(root, root->osc_support_set, mask);
398                 if (ACPI_FAILURE(status))
399                         goto out;
400                 if (ctrl == *mask)
401                         break;
402                 decode_osc_control(root, "platform does not support",
403                                    ctrl & ~(*mask));
404                 ctrl = *mask;
405         }
406 
407         if ((ctrl & req) != req) {
408                 decode_osc_control(root, "not requesting control; platform does not support",
409                                    req & ~(ctrl));
410                 status = AE_SUPPORT;
411                 goto out;
412         }
413 
414         capbuf[OSC_QUERY_DWORD] = 0;
415         capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;
416         capbuf[OSC_CONTROL_DWORD] = ctrl;
417         status = acpi_pci_run_osc(handle, capbuf, mask);
418         if (ACPI_SUCCESS(status))
419                 root->osc_control_set = *mask;
420 out:
421         mutex_unlock(&osc_lock);
422         return status;
423 }
424 EXPORT_SYMBOL(acpi_pci_osc_control_set);
425 
426 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
427 {
428         u32 support, control, requested;
429         acpi_status status;
430         struct acpi_device *device = root->device;
431         acpi_handle handle = device->handle;
432 
433         /*
434          * Apple always return failure on _OSC calls when _OSI("Darwin") has
435          * been called successfully. We know the feature set supported by the
436          * platform, so avoid calling _OSC at all
437          */
438 
439         if (dmi_match(DMI_SYS_VENDOR, "Apple Inc.")) {
440                 root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;
441                 decode_osc_control(root, "OS assumes control of",
442                                    root->osc_control_set);
443                 return;
444         }
445 
446         /*
447          * All supported architectures that use ACPI have support for
448          * PCI domains, so we indicate this in _OSC support capabilities.
449          */
450         support = OSC_PCI_SEGMENT_GROUPS_SUPPORT;
451         if (pci_ext_cfg_avail())
452                 support |= OSC_PCI_EXT_CONFIG_SUPPORT;
453         if (pcie_aspm_support_enabled())
454                 support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT;
455         if (pci_msi_enabled())
456                 support |= OSC_PCI_MSI_SUPPORT;
457 
458         decode_osc_support(root, "OS supports", support);
459         status = acpi_pci_osc_support(root, support);
460         if (ACPI_FAILURE(status)) {
461                 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
462                          acpi_format_exception(status));
463                 *no_aspm = 1;
464                 return;
465         }
466 
467         if (pcie_ports_disabled) {
468                 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n");
469                 return;
470         }
471 
472         if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) {
473                 decode_osc_support(root, "not requesting OS control; OS requires",
474                                    ACPI_PCIE_REQ_SUPPORT);
475                 return;
476         }
477 
478         control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL
479                 | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL
480                 | OSC_PCI_EXPRESS_PME_CONTROL;
481 
482         if (pci_aer_available()) {
483                 if (aer_acpi_firmware_first())
484                         dev_info(&device->dev,
485                                  "PCIe AER handled by firmware\n");
486                 else
487                         control |= OSC_PCI_EXPRESS_AER_CONTROL;
488         }
489 
490         requested = control;
491         status = acpi_pci_osc_control_set(handle, &control,
492                                           OSC_PCI_EXPRESS_CAPABILITY_CONTROL);
493         if (ACPI_SUCCESS(status)) {
494                 decode_osc_control(root, "OS now controls", control);
495                 if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) {
496                         /*
497                          * We have ASPM control, but the FADT indicates that
498                          * it's unsupported. Leave existing configuration
499                          * intact and prevent the OS from touching it.
500                          */
501                         dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n");
502                         *no_aspm = 1;
503                 }
504         } else {
505                 decode_osc_control(root, "OS requested", requested);
506                 decode_osc_control(root, "platform willing to grant", control);
507                 dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n",
508                         acpi_format_exception(status));
509 
510                 /*
511                  * We want to disable ASPM here, but aspm_disabled
512                  * needs to remain in its state from boot so that we
513                  * properly handle PCIe 1.1 devices.  So we set this
514                  * flag here, to defer the action until after the ACPI
515                  * root scan.
516                  */
517                 *no_aspm = 1;
518         }
519 }
520 
521 static int acpi_pci_root_add(struct acpi_device *device,
522                              const struct acpi_device_id *not_used)
523 {
524         unsigned long long segment, bus;
525         acpi_status status;
526         int result;
527         struct acpi_pci_root *root;
528         acpi_handle handle = device->handle;
529         int no_aspm = 0;
530         bool hotadd = system_state != SYSTEM_BOOTING;
531 
532         root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);
533         if (!root)
534                 return -ENOMEM;
535 
536         segment = 0;
537         status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL,
538                                        &segment);
539         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
540                 dev_err(&device->dev,  "can't evaluate _SEG\n");
541                 result = -ENODEV;
542                 goto end;
543         }
544 
545         /* Check _CRS first, then _BBN.  If no _BBN, default to zero. */
546         root->secondary.flags = IORESOURCE_BUS;
547         status = try_get_root_bridge_busnr(handle, &root->secondary);
548         if (ACPI_FAILURE(status)) {
549                 /*
550                  * We need both the start and end of the downstream bus range
551                  * to interpret _CBA (MMCONFIG base address), so it really is
552                  * supposed to be in _CRS.  If we don't find it there, all we
553                  * can do is assume [_BBN-0xFF] or [0-0xFF].
554                  */
555                 root->secondary.end = 0xFF;
556                 dev_warn(&device->dev,
557                          FW_BUG "no secondary bus range in _CRS\n");
558                 status = acpi_evaluate_integer(handle, METHOD_NAME__BBN,
559                                                NULL, &bus);
560                 if (ACPI_SUCCESS(status))
561                         root->secondary.start = bus;
562                 else if (status == AE_NOT_FOUND)
563                         root->secondary.start = 0;
564                 else {
565                         dev_err(&device->dev, "can't evaluate _BBN\n");
566                         result = -ENODEV;
567                         goto end;
568                 }
569         }
570 
571         root->device = device;
572         root->segment = segment & 0xFFFF;
573         strcpy(acpi_device_name(device), ACPI_PCI_ROOT_DEVICE_NAME);
574         strcpy(acpi_device_class(device), ACPI_PCI_ROOT_CLASS);
575         device->driver_data = root;
576 
577         if (hotadd && dmar_device_add(handle)) {
578                 result = -ENXIO;
579                 goto end;
580         }
581 
582         pr_info(PREFIX "%s [%s] (domain %04x %pR)\n",
583                acpi_device_name(device), acpi_device_bid(device),
584                root->segment, &root->secondary);
585 
586         root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);
587 
588         negotiate_os_control(root, &no_aspm);
589 
590         /*
591          * TBD: Need PCI interface for enumeration/configuration of roots.
592          */
593 
594         /*
595          * Scan the Root Bridge
596          * --------------------
597          * Must do this prior to any attempt to bind the root device, as the
598          * PCI namespace does not get created until this call is made (and
599          * thus the root bridge's pci_dev does not exist).
600          */
601         root->bus = pci_acpi_scan_root(root);
602         if (!root->bus) {
603                 dev_err(&device->dev,
604                         "Bus %04x:%02x not present in PCI namespace\n",
605                         root->segment, (unsigned int)root->secondary.start);
606                 device->driver_data = NULL;
607                 result = -ENODEV;
608                 goto remove_dmar;
609         }
610 
611         if (no_aspm)
612                 pcie_no_aspm();
613 
614         pci_acpi_add_bus_pm_notifier(device);
615         if (device->wakeup.flags.run_wake)
616                 device_set_run_wake(root->bus->bridge, true);
617 
618         if (hotadd) {
619                 pcibios_resource_survey_bus(root->bus);
620                 pci_assign_unassigned_root_bus_resources(root->bus);
621                 acpi_ioapic_add(root);
622         }
623 
624         pci_lock_rescan_remove();
625         pci_bus_add_devices(root->bus);
626         pci_unlock_rescan_remove();
627         return 1;
628 
629 remove_dmar:
630         if (hotadd)
631                 dmar_device_remove(handle);
632 end:
633         kfree(root);
634         return result;
635 }
636 
637 static void acpi_pci_root_remove(struct acpi_device *device)
638 {
639         struct acpi_pci_root *root = acpi_driver_data(device);
640 
641         pci_lock_rescan_remove();
642 
643         pci_stop_root_bus(root->bus);
644 
645         WARN_ON(acpi_ioapic_remove(root));
646 
647         device_set_run_wake(root->bus->bridge, false);
648         pci_acpi_remove_bus_pm_notifier(device);
649 
650         pci_remove_root_bus(root->bus);
651 
652         dmar_device_remove(device->handle);
653 
654         pci_unlock_rescan_remove();
655 
656         kfree(root);
657 }
658 
659 void __init acpi_pci_root_init(void)
660 {
661         acpi_hest_init();
662         if (acpi_pci_disabled)
663                 return;
664 
665         pci_acpi_crs_quirks();
666         acpi_scan_add_handler_with_hotplug(&pci_root_handler, "pci_root");
667 }
668 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us