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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 | // SPDX-License-Identifier: GPL-2.0-only /* * pci_slot.c - ACPI PCI Slot Driver * * The code here is heavily leveraged from the acpiphp module. * Thanks to Matthew Wilcox <matthew@wil.cx> for much guidance. * Thanks to Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> for code * review and fixes. * * Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P. * Alex Chiang <achiang@hp.com> * * Copyright (C) 2013 Huawei Tech. Co., Ltd. * Jiang Liu <jiang.liu@huawei.com> */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/list.h> #include <linux/pci.h> #include <linux/acpi.h> #include <linux/dmi.h> #include <linux/pci-acpi.h> static int check_sta_before_sun; #define _COMPONENT ACPI_PCI_COMPONENT ACPI_MODULE_NAME("pci_slot"); #define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */ struct acpi_pci_slot { struct pci_slot *pci_slot; /* corresponding pci_slot */ struct list_head list; /* node in the list of slots */ }; static LIST_HEAD(slot_list); static DEFINE_MUTEX(slot_list_lock); static int check_slot(acpi_handle handle, unsigned long long *sun) { int device = -1; unsigned long long adr, sta; acpi_status status; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); pr_debug("Checking slot on path: %s\n", (char *)buffer.pointer); if (check_sta_before_sun) { /* If SxFy doesn't have _STA, we just assume it's there */ status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT)) goto out; } status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); if (ACPI_FAILURE(status)) { pr_debug("_ADR returned %d on %s\n", status, (char *)buffer.pointer); goto out; } /* No _SUN == not a slot == bail */ status = acpi_evaluate_integer(handle, "_SUN", NULL, sun); if (ACPI_FAILURE(status)) { pr_debug("_SUN returned %d on %s\n", status, (char *)buffer.pointer); goto out; } device = (adr >> 16) & 0xffff; out: kfree(buffer.pointer); return device; } /* * Check whether handle has an associated slot and create PCI slot if it has. */ static acpi_status register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) { int device; unsigned long long sun; char name[SLOT_NAME_SIZE]; struct acpi_pci_slot *slot; struct pci_slot *pci_slot; struct pci_bus *pci_bus = context; device = check_slot(handle, &sun); if (device < 0) return AE_OK; /* * There may be multiple PCI functions associated with the same slot. * Check whether PCI slot has already been created for this PCI device. */ list_for_each_entry(slot, &slot_list, list) { pci_slot = slot->pci_slot; if (pci_slot->bus == pci_bus && pci_slot->number == device) return AE_OK; } slot = kmalloc(sizeof(*slot), GFP_KERNEL); if (!slot) return AE_OK; snprintf(name, sizeof(name), "%llu", sun); pci_slot = pci_create_slot(pci_bus, device, name, NULL); if (IS_ERR(pci_slot)) { pr_err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot)); kfree(slot); return AE_OK; } slot->pci_slot = pci_slot; list_add(&slot->list, &slot_list); get_device(&pci_bus->dev); pr_debug("%p, pci_bus: %x, device: %d, name: %s\n", pci_slot, pci_bus->number, device, name); return AE_OK; } void acpi_pci_slot_enumerate(struct pci_bus *bus) { acpi_handle handle = ACPI_HANDLE(bus->bridge); if (handle) { mutex_lock(&slot_list_lock); acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, register_slot, NULL, bus, NULL); mutex_unlock(&slot_list_lock); } } void acpi_pci_slot_remove(struct pci_bus *bus) { struct acpi_pci_slot *slot, *tmp; mutex_lock(&slot_list_lock); list_for_each_entry_safe(slot, tmp, &slot_list, list) { if (slot->pci_slot->bus == bus) { list_del(&slot->list); pci_destroy_slot(slot->pci_slot); put_device(&bus->dev); kfree(slot); } } mutex_unlock(&slot_list_lock); } static int do_sta_before_sun(const struct dmi_system_id *d) { pr_info("%s detected: will evaluate _STA before calling _SUN\n", d->ident); check_sta_before_sun = 1; return 0; } static const struct dmi_system_id acpi_pci_slot_dmi_table[] __initconst = { /* * Fujitsu Primequest machines will return 1023 to indicate an * error if the _SUN method is evaluated on SxFy objects that * are not present (as indicated by _STA), so for those machines, * we want to check _STA before evaluating _SUN. */ { .callback = do_sta_before_sun, .ident = "Fujitsu PRIMEQUEST", .matches = { DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"), DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"), }, }, {} }; void __init acpi_pci_slot_init(void) { dmi_check_system(acpi_pci_slot_dmi_table); } |