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187 lines
4.7 KiB
187 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* pci_slot.c - ACPI PCI Slot Driver |
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* |
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* The code here is heavily leveraged from the acpiphp module. |
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* Thanks to Matthew Wilcox <[email protected]> for much guidance. |
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* Thanks to Kenji Kaneshige <[email protected]> for code |
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* review and fixes. |
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* |
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* Copyright (C) 2007-2008 Hewlett-Packard Development Company, L.P. |
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* Alex Chiang <[email protected]> |
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* |
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* Copyright (C) 2013 Huawei Tech. Co., Ltd. |
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* Jiang Liu <[email protected]> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#include <linux/list.h> |
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#include <linux/pci.h> |
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#include <linux/acpi.h> |
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#include <linux/dmi.h> |
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#include <linux/pci-acpi.h> |
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static int check_sta_before_sun; |
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#define SLOT_NAME_SIZE 21 /* Inspired by #define in acpiphp.h */ |
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struct acpi_pci_slot { |
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struct pci_slot *pci_slot; /* corresponding pci_slot */ |
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struct list_head list; /* node in the list of slots */ |
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}; |
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static LIST_HEAD(slot_list); |
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static DEFINE_MUTEX(slot_list_lock); |
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static int |
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check_slot(acpi_handle handle, unsigned long long *sun) |
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{ |
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int device = -1; |
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unsigned long long adr, sta; |
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acpi_status status; |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
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pr_debug("Checking slot on path: %s\n", (char *)buffer.pointer); |
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if (check_sta_before_sun) { |
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/* If SxFy doesn't have _STA, we just assume it's there */ |
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status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
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if (ACPI_SUCCESS(status) && !(sta & ACPI_STA_DEVICE_PRESENT)) |
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goto out; |
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} |
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status = acpi_evaluate_integer(handle, "_ADR", NULL, &adr); |
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if (ACPI_FAILURE(status)) { |
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pr_debug("_ADR returned %d on %s\n", |
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status, (char *)buffer.pointer); |
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goto out; |
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} |
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/* No _SUN == not a slot == bail */ |
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status = acpi_evaluate_integer(handle, "_SUN", NULL, sun); |
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if (ACPI_FAILURE(status)) { |
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pr_debug("_SUN returned %d on %s\n", |
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status, (char *)buffer.pointer); |
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goto out; |
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} |
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device = (adr >> 16) & 0xffff; |
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out: |
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kfree(buffer.pointer); |
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return device; |
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} |
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/* |
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* Check whether handle has an associated slot and create PCI slot if it has. |
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*/ |
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static acpi_status |
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register_slot(acpi_handle handle, u32 lvl, void *context, void **rv) |
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{ |
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int device; |
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unsigned long long sun; |
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char name[SLOT_NAME_SIZE]; |
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struct acpi_pci_slot *slot; |
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struct pci_slot *pci_slot; |
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struct pci_bus *pci_bus = context; |
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device = check_slot(handle, &sun); |
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if (device < 0) |
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return AE_OK; |
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/* |
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* There may be multiple PCI functions associated with the same slot. |
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* Check whether PCI slot has already been created for this PCI device. |
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*/ |
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list_for_each_entry(slot, &slot_list, list) { |
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pci_slot = slot->pci_slot; |
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if (pci_slot->bus == pci_bus && pci_slot->number == device) |
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return AE_OK; |
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} |
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slot = kmalloc(sizeof(*slot), GFP_KERNEL); |
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if (!slot) |
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return AE_OK; |
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snprintf(name, sizeof(name), "%llu", sun); |
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pci_slot = pci_create_slot(pci_bus, device, name, NULL); |
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if (IS_ERR(pci_slot)) { |
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pr_err("pci_create_slot returned %ld\n", PTR_ERR(pci_slot)); |
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kfree(slot); |
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return AE_OK; |
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} |
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slot->pci_slot = pci_slot; |
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list_add(&slot->list, &slot_list); |
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get_device(&pci_bus->dev); |
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pr_debug("%p, pci_bus: %x, device: %d, name: %s\n", |
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pci_slot, pci_bus->number, device, name); |
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return AE_OK; |
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} |
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void acpi_pci_slot_enumerate(struct pci_bus *bus) |
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{ |
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acpi_handle handle = ACPI_HANDLE(bus->bridge); |
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if (handle) { |
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mutex_lock(&slot_list_lock); |
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acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, |
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register_slot, NULL, bus, NULL); |
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mutex_unlock(&slot_list_lock); |
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} |
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} |
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void acpi_pci_slot_remove(struct pci_bus *bus) |
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{ |
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struct acpi_pci_slot *slot, *tmp; |
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mutex_lock(&slot_list_lock); |
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list_for_each_entry_safe(slot, tmp, &slot_list, list) { |
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if (slot->pci_slot->bus == bus) { |
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list_del(&slot->list); |
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pci_destroy_slot(slot->pci_slot); |
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put_device(&bus->dev); |
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kfree(slot); |
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} |
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} |
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mutex_unlock(&slot_list_lock); |
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} |
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static int do_sta_before_sun(const struct dmi_system_id *d) |
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{ |
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pr_info("%s detected: will evaluate _STA before calling _SUN\n", |
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d->ident); |
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check_sta_before_sun = 1; |
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return 0; |
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} |
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static const struct dmi_system_id acpi_pci_slot_dmi_table[] __initconst = { |
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/* |
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* Fujitsu Primequest machines will return 1023 to indicate an |
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* error if the _SUN method is evaluated on SxFy objects that |
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* are not present (as indicated by _STA), so for those machines, |
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* we want to check _STA before evaluating _SUN. |
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*/ |
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{ |
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.callback = do_sta_before_sun, |
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.ident = "Fujitsu PRIMEQUEST", |
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.matches = { |
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DMI_MATCH(DMI_BIOS_VENDOR, "FUJITSU LIMITED"), |
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DMI_MATCH(DMI_BIOS_VERSION, "PRIMEQUEST"), |
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}, |
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}, |
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{} |
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}; |
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void __init acpi_pci_slot_init(void) |
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{ |
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dmi_check_system(acpi_pci_slot_dmi_table); |
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}
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