Lines Matching +full:- +full:- +full:root
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
19 #include <linux/pci-acpi.h>
28 #define ACPI_PCI_ROOT_DEVICE_NAME "PCI Root Bridge"
60 * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
95 res->start = address.address.minimum; in get_root_bridge_busnr_callback()
96 res->end = address.address.minimum + address.address.address_length - 1; in get_root_bridge_busnr_callback()
107 res->start = -1; in try_get_root_bridge_busnr()
113 if (res->start == -1) in try_get_root_bridge_busnr()
130 { OSC_PCI_HPX_TYPE_3_SUPPORT, "HPX-Type3" },
154 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, in decode_osc_bits() argument
163 if (word & entry->bit) in decode_osc_bits()
164 len += scnprintf(buf + len, sizeof(buf) - len, "%s%s", in decode_osc_bits()
165 len ? " " : "", entry->desc); in decode_osc_bits()
167 dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); in decode_osc_bits()
170 static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) in decode_osc_support() argument
172 decode_osc_bits(root, msg, word, pci_osc_support_bit, in decode_osc_support()
176 static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) in decode_osc_control() argument
178 decode_osc_bits(root, msg, word, pci_osc_control_bit, in decode_osc_control()
182 static void decode_cxl_osc_support(struct acpi_pci_root *root, char *msg, u32 word) in decode_cxl_osc_support() argument
184 decode_osc_bits(root, msg, word, cxl_osc_support_bit, in decode_cxl_osc_support()
188 static void decode_cxl_osc_control(struct acpi_pci_root *root, char *msg, u32 word) in decode_cxl_osc_control() argument
190 decode_osc_bits(root, msg, word, cxl_osc_control_bit, in decode_cxl_osc_control()
194 static inline bool is_pcie(struct acpi_pci_root *root) in is_pcie() argument
196 return root->bridge_type == ACPI_BRIDGE_TYPE_PCIE; in is_pcie()
199 static inline bool is_cxl(struct acpi_pci_root *root) in is_cxl() argument
201 return root->bridge_type == ACPI_BRIDGE_TYPE_CXL; in is_cxl()
204 static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766";
205 static u8 cxl_osc_uuid_str[] = "68F2D50B-C469-4d8A-BD3D-941A103FD3FC";
207 static char *to_uuid(struct acpi_pci_root *root) in to_uuid() argument
209 if (is_cxl(root)) in to_uuid()
214 static int cap_length(struct acpi_pci_root *root) in cap_length() argument
216 if (is_cxl(root)) in cap_length()
221 static acpi_status acpi_pci_run_osc(struct acpi_pci_root *root, in acpi_pci_run_osc() argument
226 .uuid_str = to_uuid(root), in acpi_pci_run_osc()
228 .cap.length = cap_length(root), in acpi_pci_run_osc()
233 status = acpi_run_osc(root->device->handle, &context); in acpi_pci_run_osc()
236 if (is_cxl(root)) in acpi_pci_run_osc()
243 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, u32 support, in acpi_pci_query_osc() argument
250 support |= root->osc_support_set; in acpi_pci_query_osc()
254 capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; in acpi_pci_query_osc()
256 if (is_cxl(root)) { in acpi_pci_query_osc()
257 cxl_support |= root->osc_ext_support_set; in acpi_pci_query_osc()
259 capbuf[OSC_EXT_CONTROL_DWORD] = *cxl_control | root->osc_ext_control_set; in acpi_pci_query_osc()
263 status = acpi_pci_run_osc(root, capbuf, &pci_result, &cxl_result); in acpi_pci_query_osc()
265 root->osc_support_set = support; in acpi_pci_query_osc()
267 if (is_cxl(root)) { in acpi_pci_query_osc()
268 root->osc_ext_support_set = cxl_support; in acpi_pci_query_osc()
271 } else if (is_cxl(root)) { in acpi_pci_query_osc()
276 root->bridge_type = ACPI_BRIDGE_TYPE_PCIE; in acpi_pci_query_osc()
285 struct acpi_pci_root *root; in acpi_pci_find_root() local
290 root = acpi_driver_data(device); in acpi_pci_find_root()
292 return root; in acpi_pci_find_root()
302 * acpi_get_pci_dev - convert ACPI CA handle to struct pci_dev
322 mutex_lock(&adev->physical_node_lock); in acpi_get_pci_dev()
324 list_for_each_entry(pn, &adev->physical_node_list, node) { in acpi_get_pci_dev()
325 if (dev_is_pci(pn->dev)) { in acpi_get_pci_dev()
326 get_device(pn->dev); in acpi_get_pci_dev()
327 pci_dev = to_pci_dev(pn->dev); in acpi_get_pci_dev()
332 mutex_unlock(&adev->physical_node_lock); in acpi_get_pci_dev()
339 * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
340 * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
360 struct acpi_pci_root *root; in acpi_pci_osc_control_set() local
367 root = acpi_pci_find_root(handle); in acpi_pci_osc_control_set()
368 if (!root) in acpi_pci_osc_control_set()
372 *mask |= root->osc_control_set; in acpi_pci_osc_control_set()
374 if (is_cxl(root)) { in acpi_pci_osc_control_set()
376 *cxl_mask |= root->osc_ext_control_set; in acpi_pci_osc_control_set()
383 status = acpi_pci_query_osc(root, support, mask, cxl_support, in acpi_pci_osc_control_set()
387 if (is_cxl(root)) { in acpi_pci_osc_control_set()
398 decode_osc_control(root, "platform does not support", in acpi_pci_osc_control_set()
401 decode_cxl_osc_control(root, "CXL platform does not support", in acpi_pci_osc_control_set()
408 if ((root->osc_control_set & ctrl) == ctrl && in acpi_pci_osc_control_set()
409 (root->osc_ext_control_set & cxl_ctrl) == cxl_ctrl) in acpi_pci_osc_control_set()
413 decode_osc_control(root, "not requesting control; platform does not support", in acpi_pci_osc_control_set()
419 capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; in acpi_pci_osc_control_set()
421 if (is_cxl(root)) { in acpi_pci_osc_control_set()
422 capbuf[OSC_EXT_SUPPORT_DWORD] = root->osc_ext_support_set; in acpi_pci_osc_control_set()
426 status = acpi_pci_run_osc(root, capbuf, mask, cxl_mask); in acpi_pci_osc_control_set()
430 root->osc_control_set = *mask; in acpi_pci_osc_control_set()
431 root->osc_ext_control_set = *cxl_mask; in acpi_pci_osc_control_set()
489 * [1]: https://lore.kernel.org/all/20201122014203.4706-1-ashok.raj@intel.com/
526 * the PCI Firmware Spec, r3.2, sec 4.5.1, table 4-5, in calculate_control()
546 static bool os_control_query_checks(struct acpi_pci_root *root, u32 support) in os_control_query_checks() argument
548 struct acpi_device *device = root->device; in os_control_query_checks()
551 dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); in os_control_query_checks()
556 decode_osc_support(root, "not requesting OS control; OS requires", in os_control_query_checks()
564 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm) in negotiate_os_control() argument
569 struct acpi_device *device = root->device; in negotiate_os_control()
570 acpi_handle handle = device->handle; in negotiate_os_control()
578 root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL; in negotiate_os_control()
579 decode_osc_control(root, "OS assumes control of", in negotiate_os_control()
580 root->osc_control_set); in negotiate_os_control()
586 decode_osc_support(root, "OS supports", support); in negotiate_os_control()
588 if (os_control_query_checks(root, support)) in negotiate_os_control()
591 if (is_cxl(root)) { in negotiate_os_control()
593 decode_cxl_osc_support(root, "OS supports", cxl_support); in negotiate_os_control()
601 decode_osc_control(root, "OS now controls", control); in negotiate_os_control()
603 decode_cxl_osc_control(root, "OS now controls", in negotiate_os_control()
612 dev_info(&device->dev, "FADT indicates ASPM is unsupported, using BIOS configuration\n"); in negotiate_os_control()
621 * root scan. in negotiate_os_control()
626 if (status == AE_NOT_FOUND && !is_pcie(root)) in negotiate_os_control()
630 decode_osc_control(root, "OS requested", requested); in negotiate_os_control()
631 decode_osc_control(root, "platform willing to grant", control); in negotiate_os_control()
634 decode_cxl_osc_control(root, "OS requested", cxl_requested); in negotiate_os_control()
635 decode_cxl_osc_control(root, "platform willing to grant", in negotiate_os_control()
639 dev_info(&device->dev, "_OSC: platform retains control of PCIe features (%s)\n", in negotiate_os_control()
650 struct acpi_pci_root *root; in acpi_pci_root_add() local
651 acpi_handle handle = device->handle; in acpi_pci_root_add()
656 root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); in acpi_pci_root_add()
657 if (!root) in acpi_pci_root_add()
658 return -ENOMEM; in acpi_pci_root_add()
664 dev_err(&device->dev, "can't evaluate _SEG\n"); in acpi_pci_root_add()
665 result = -ENODEV; in acpi_pci_root_add()
670 root->secondary.flags = IORESOURCE_BUS; in acpi_pci_root_add()
671 status = try_get_root_bridge_busnr(handle, &root->secondary); in acpi_pci_root_add()
677 * can do is assume [_BBN-0xFF] or [0-0xFF]. in acpi_pci_root_add()
679 root->secondary.end = 0xFF; in acpi_pci_root_add()
680 dev_warn(&device->dev, in acpi_pci_root_add()
685 root->secondary.start = bus; in acpi_pci_root_add()
687 root->secondary.start = 0; in acpi_pci_root_add()
689 dev_err(&device->dev, "can't evaluate _BBN\n"); in acpi_pci_root_add()
690 result = -ENODEV; in acpi_pci_root_add()
695 root->device = device; in acpi_pci_root_add()
696 root->segment = segment & 0xFFFF; in acpi_pci_root_add()
699 device->driver_data = root; in acpi_pci_root_add()
702 result = -ENXIO; in acpi_pci_root_add()
708 root->segment, &root->secondary); in acpi_pci_root_add()
710 root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); in acpi_pci_root_add()
712 acpi_hid = acpi_device_hid(root->device); in acpi_pci_root_add()
714 root->bridge_type = ACPI_BRIDGE_TYPE_PCIE; in acpi_pci_root_add()
716 root->bridge_type = ACPI_BRIDGE_TYPE_CXL; in acpi_pci_root_add()
718 dev_dbg(&device->dev, "Assuming non-PCIe host bridge\n"); in acpi_pci_root_add()
720 negotiate_os_control(root, &no_aspm); in acpi_pci_root_add()
727 * Scan the Root Bridge in acpi_pci_root_add()
728 * -------------------- in acpi_pci_root_add()
729 * Must do this prior to any attempt to bind the root device, as the in acpi_pci_root_add()
731 * thus the root bridge's pci_dev does not exist). in acpi_pci_root_add()
733 root->bus = pci_acpi_scan_root(root); in acpi_pci_root_add()
734 if (!root->bus) { in acpi_pci_root_add()
735 dev_err(&device->dev, in acpi_pci_root_add()
737 root->segment, (unsigned int)root->secondary.start); in acpi_pci_root_add()
738 device->driver_data = NULL; in acpi_pci_root_add()
739 result = -ENODEV; in acpi_pci_root_add()
747 device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid); in acpi_pci_root_add()
750 pcibios_resource_survey_bus(root->bus); in acpi_pci_root_add()
751 pci_assign_unassigned_root_bus_resources(root->bus); in acpi_pci_root_add()
753 * This is only called for the hotadd case. For the boot-time in acpi_pci_root_add()
757 * This is currently x86-specific, because acpi_ioapic_add() in acpi_pci_root_add()
762 acpi_ioapic_add(root->device->handle); in acpi_pci_root_add()
766 pci_bus_add_devices(root->bus); in acpi_pci_root_add()
774 kfree(root); in acpi_pci_root_add()
780 struct acpi_pci_root *root = acpi_driver_data(device); in acpi_pci_root_remove() local
784 pci_stop_root_bus(root->bus); in acpi_pci_root_remove()
786 pci_ioapic_remove(root); in acpi_pci_root_remove()
787 device_set_wakeup_capable(root->bus->bridge, false); in acpi_pci_root_remove()
790 pci_remove_root_bus(root->bus); in acpi_pci_root_remove()
791 WARN_ON(acpi_ioapic_remove(root)); in acpi_pci_root_remove()
793 dmar_device_remove(device->handle); in acpi_pci_root_remove()
797 kfree(root); in acpi_pci_root_remove()
810 struct resource *res1, *res2, *root = NULL; in acpi_pci_root_validate_resources() local
814 root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource; in acpi_pci_root_validate_resources()
821 res1 = entry->res; in acpi_pci_root_validate_resources()
822 if (!(res1->flags & type)) in acpi_pci_root_validate_resources()
825 /* Exclude non-addressable range or non-addressable portion */ in acpi_pci_root_validate_resources()
826 end = min(res1->end, root->end); in acpi_pci_root_validate_resources()
827 if (end <= res1->start) { in acpi_pci_root_validate_resources()
832 } else if (res1->end != end) { in acpi_pci_root_validate_resources()
833 dev_info(dev, "host bridge window %pR ([%#llx-%#llx] ignored, not CPU addressable)\n", in acpi_pci_root_validate_resources()
835 (unsigned long long)res1->end); in acpi_pci_root_validate_resources()
836 res1->end = end; in acpi_pci_root_validate_resources()
840 res2 = entry2->res; in acpi_pci_root_validate_resources()
841 if (!(res2->flags & type)) in acpi_pci_root_validate_resources()
870 struct resource *res = entry->res; in acpi_pci_root_remap_iospace()
871 resource_size_t cpu_addr = res->start; in acpi_pci_root_remap_iospace()
872 resource_size_t pci_addr = cpu_addr - entry->offset; in acpi_pci_root_remap_iospace()
880 if (port == (unsigned long)-1) in acpi_pci_root_remap_iospace()
883 res->start = port; in acpi_pci_root_remap_iospace()
884 res->end = port + length - 1; in acpi_pci_root_remap_iospace()
885 entry->offset = port - pci_addr; in acpi_pci_root_remap_iospace()
893 res->flags |= IORESOURCE_DISABLED; in acpi_pci_root_remap_iospace()
900 struct list_head *list = &info->resources; in acpi_pci_probe_root_resources()
901 struct acpi_device *device = info->bridge; in acpi_pci_probe_root_resources()
910 dev_warn(&device->dev, in acpi_pci_probe_root_resources()
913 dev_dbg(&device->dev, in acpi_pci_probe_root_resources()
917 if (entry->res->flags & IORESOURCE_IO) in acpi_pci_probe_root_resources()
918 acpi_pci_root_remap_iospace(&device->fwnode, in acpi_pci_probe_root_resources()
921 if (entry->res->flags & IORESOURCE_DISABLED) in acpi_pci_probe_root_resources()
924 entry->res->name = info->name; in acpi_pci_probe_root_resources()
926 acpi_pci_root_validate_resources(&device->dev, list, in acpi_pci_probe_root_resources()
928 acpi_pci_root_validate_resources(&device->dev, list, in acpi_pci_probe_root_resources()
938 struct resource *res, *conflict, *root = NULL; in pci_acpi_root_add_resources() local
940 resource_list_for_each_entry_safe(entry, tmp, &info->resources) { in pci_acpi_root_add_resources()
941 res = entry->res; in pci_acpi_root_add_resources()
942 if (res->flags & IORESOURCE_MEM) in pci_acpi_root_add_resources()
943 root = &iomem_resource; in pci_acpi_root_add_resources()
944 else if (res->flags & IORESOURCE_IO) in pci_acpi_root_add_resources()
945 root = &ioport_resource; in pci_acpi_root_add_resources()
953 if (res == root) in pci_acpi_root_add_resources()
956 conflict = insert_resource_conflict(root, res); in pci_acpi_root_add_resources()
958 dev_info(&info->bridge->dev, in pci_acpi_root_add_resources()
960 res, conflict->name, conflict); in pci_acpi_root_add_resources()
974 resource_list_for_each_entry_safe(entry, tmp, &info->resources) { in __acpi_pci_root_release_info()
975 res = entry->res; in __acpi_pci_root_release_info()
976 if (res->parent && in __acpi_pci_root_release_info()
977 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) in __acpi_pci_root_release_info()
982 info->ops->release_info(info); in __acpi_pci_root_release_info()
990 resource_list_for_each_entry(entry, &bridge->windows) { in acpi_pci_root_release_info()
991 res = entry->res; in acpi_pci_root_release_info()
992 if (res->flags & IORESOURCE_IO) in acpi_pci_root_release_info()
994 if (res->parent && in acpi_pci_root_release_info()
995 (res->flags & (IORESOURCE_MEM | IORESOURCE_IO))) in acpi_pci_root_release_info()
998 __acpi_pci_root_release_info(bridge->release_data); in acpi_pci_root_release_info()
1001 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root, in acpi_pci_root_create() argument
1006 int ret, busnum = root->secondary.start; in acpi_pci_root_create()
1007 struct acpi_device *device = root->device; in acpi_pci_root_create()
1008 int node = acpi_get_node(device->handle); in acpi_pci_root_create()
1013 info->root = root; in acpi_pci_root_create()
1014 info->bridge = device; in acpi_pci_root_create()
1015 info->ops = ops; in acpi_pci_root_create()
1016 INIT_LIST_HEAD(&info->resources); in acpi_pci_root_create()
1017 snprintf(info->name, sizeof(info->name), "PCI Bus %04x:%02x", in acpi_pci_root_create()
1018 root->segment, busnum); in acpi_pci_root_create()
1020 if (ops->init_info && ops->init_info(info)) in acpi_pci_root_create()
1022 if (ops->prepare_resources) in acpi_pci_root_create()
1023 ret = ops->prepare_resources(info); in acpi_pci_root_create()
1030 pci_add_resource(&info->resources, &root->secondary); in acpi_pci_root_create()
1031 bus = pci_create_root_bus(NULL, busnum, ops->pci_ops, in acpi_pci_root_create()
1032 sysdata, &info->resources); in acpi_pci_root_create()
1036 host_bridge = to_pci_host_bridge(bus->bridge); in acpi_pci_root_create()
1037 if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) in acpi_pci_root_create()
1038 host_bridge->native_pcie_hotplug = 0; in acpi_pci_root_create()
1039 if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL)) in acpi_pci_root_create()
1040 host_bridge->native_shpc_hotplug = 0; in acpi_pci_root_create()
1041 if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL)) in acpi_pci_root_create()
1042 host_bridge->native_aer = 0; in acpi_pci_root_create()
1043 if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL)) in acpi_pci_root_create()
1044 host_bridge->native_pme = 0; in acpi_pci_root_create()
1045 if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) in acpi_pci_root_create()
1046 host_bridge->native_ltr = 0; in acpi_pci_root_create()
1047 if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL)) in acpi_pci_root_create()
1048 host_bridge->native_dpc = 0; in acpi_pci_root_create()
1050 if (!(root->osc_ext_control_set & OSC_CXL_ERROR_REPORTING_CONTROL)) in acpi_pci_root_create()
1051 host_bridge->native_cxl_error = 0; in acpi_pci_root_create()
1058 obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, in acpi_pci_root_create()
1060 if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) in acpi_pci_root_create()
1061 host_bridge->preserve_config = 1; in acpi_pci_root_create()
1070 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node); in acpi_pci_root_create()