summaryrefslogtreecommitdiff
path: root/drivers/pci/slot.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/slot.c')
-rw-r--r--drivers/pci/slot.c194
1 files changed, 56 insertions, 138 deletions
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index c1e9284a677b..50fb3eb595fe 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -1,5 +1,5 @@
+// SPDX-License-Identifier: GPL-2.0
/*
- * drivers/pci/slot.c
* Copyright (C) 2006 Matthew Wilcox <matthew@wil.cx>
* Copyright (C) 2006-2009 Hewlett-Packard Development Company, L.P.
* Alex Chiang <achiang@hp.com>
@@ -7,7 +7,6 @@
#include <linux/kobject.h>
#include <linux/slab.h>
-#include <linux/module.h>
#include <linux/pci.h>
#include <linux/err.h>
#include "pci.h"
@@ -39,53 +38,19 @@ static const struct sysfs_ops pci_slot_sysfs_ops = {
static ssize_t address_read_file(struct pci_slot *slot, char *buf)
{
if (slot->number == 0xff)
- return sprintf(buf, "%04x:%02x\n",
- pci_domain_nr(slot->bus),
- slot->bus->number);
- else
- return sprintf(buf, "%04x:%02x:%02x\n",
- pci_domain_nr(slot->bus),
- slot->bus->number,
- slot->number);
+ return sysfs_emit(buf, "%04x:%02x\n",
+ pci_domain_nr(slot->bus),
+ slot->bus->number);
+
+ return sysfs_emit(buf, "%04x:%02x:%02x\n",
+ pci_domain_nr(slot->bus),
+ slot->bus->number,
+ slot->number);
}
-/* these strings match up with the values in pci_bus_speed */
-static const char *pci_bus_speed_strings[] = {
- "33 MHz PCI", /* 0x00 */
- "66 MHz PCI", /* 0x01 */
- "66 MHz PCI-X", /* 0x02 */
- "100 MHz PCI-X", /* 0x03 */
- "133 MHz PCI-X", /* 0x04 */
- NULL, /* 0x05 */
- NULL, /* 0x06 */
- NULL, /* 0x07 */
- NULL, /* 0x08 */
- "66 MHz PCI-X 266", /* 0x09 */
- "100 MHz PCI-X 266", /* 0x0a */
- "133 MHz PCI-X 266", /* 0x0b */
- "Unknown AGP", /* 0x0c */
- "1x AGP", /* 0x0d */
- "2x AGP", /* 0x0e */
- "4x AGP", /* 0x0f */
- "8x AGP", /* 0x10 */
- "66 MHz PCI-X 533", /* 0x11 */
- "100 MHz PCI-X 533", /* 0x12 */
- "133 MHz PCI-X 533", /* 0x13 */
- "2.5 GT/s PCIe", /* 0x14 */
- "5.0 GT/s PCIe", /* 0x15 */
- "8.0 GT/s PCIe", /* 0x16 */
-};
-
static ssize_t bus_speed_read(enum pci_bus_speed speed, char *buf)
{
- const char *speed_string;
-
- if (speed < ARRAY_SIZE(pci_bus_speed_strings))
- speed_string = pci_bus_speed_strings[speed];
- else
- speed_string = "Unknown";
-
- return sprintf(buf, "%s\n", speed_string);
+ return sysfs_emit(buf, "%s\n", pci_speed_string(speed));
}
static ssize_t max_speed_read_file(struct pci_slot *slot, char *buf)
@@ -106,21 +71,24 @@ static void pci_slot_release(struct kobject *kobj)
dev_dbg(&slot->bus->dev, "dev %02x, released physical slot %s\n",
slot->number, pci_slot_name(slot));
+ down_read(&pci_bus_sem);
list_for_each_entry(dev, &slot->bus->devices, bus_list)
if (PCI_SLOT(dev->devfn) == slot->number)
dev->slot = NULL;
+ up_read(&pci_bus_sem);
list_del(&slot->list);
+ pci_bus_put(slot->bus);
kfree(slot);
}
static struct pci_slot_attribute pci_slot_attr_address =
- __ATTR(address, (S_IFREG | S_IRUGO), address_read_file, NULL);
+ __ATTR(address, S_IRUGO, address_read_file, NULL);
static struct pci_slot_attribute pci_slot_attr_max_speed =
- __ATTR(max_bus_speed, (S_IFREG | S_IRUGO), max_speed_read_file, NULL);
+ __ATTR(max_bus_speed, S_IRUGO, max_speed_read_file, NULL);
static struct pci_slot_attribute pci_slot_attr_cur_speed =
- __ATTR(cur_bus_speed, (S_IFREG | S_IRUGO), cur_speed_read_file, NULL);
+ __ATTR(cur_bus_speed, S_IRUGO, cur_speed_read_file, NULL);
static struct attribute *pci_slot_default_attrs[] = {
&pci_slot_attr_address.attr,
@@ -128,11 +96,12 @@ static struct attribute *pci_slot_default_attrs[] = {
&pci_slot_attr_cur_speed.attr,
NULL,
};
+ATTRIBUTE_GROUPS(pci_slot_default);
-static struct kobj_type pci_slot_ktype = {
+static const struct kobj_type pci_slot_ktype = {
.sysfs_ops = &pci_slot_sysfs_ops,
.release = &pci_slot_release,
- .default_attrs = pci_slot_default_attrs,
+ .default_groups = pci_slot_default_groups,
};
static char *make_slot_name(const char *name)
@@ -191,12 +160,22 @@ static int rename_slot(struct pci_slot *slot, const char *name)
return result;
}
+void pci_dev_assign_slot(struct pci_dev *dev)
+{
+ struct pci_slot *slot;
+
+ mutex_lock(&pci_slot_mutex);
+ list_for_each_entry(slot, &dev->bus->slots, list)
+ if (PCI_SLOT(dev->devfn) == slot->number)
+ dev->slot = slot;
+ mutex_unlock(&pci_slot_mutex);
+}
+
static struct pci_slot *get_slot(struct pci_bus *parent, int slot_nr)
{
struct pci_slot *slot;
- /*
- * We already hold pci_bus_sem so don't worry
- */
+
+ /* We already hold pci_slot_mutex */
list_for_each_entry(slot, &parent->slots, list)
if (slot->number == slot_nr) {
kobject_get(&slot->kobj);
@@ -253,7 +232,7 @@ struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
int err = 0;
char *slot_name = NULL;
- down_write(&pci_bus_sem);
+ mutex_lock(&pci_slot_mutex);
if (slot_nr == -1)
goto placeholder;
@@ -265,12 +244,13 @@ struct pci_slot *pci_create_slot(struct pci_bus *parent, int slot_nr,
slot = get_slot(parent, slot_nr);
if (slot) {
if (hotplug) {
- if ((err = slot->hotplug ? -EBUSY : 0)
- || (err = rename_slot(slot, name))) {
- kobject_put(&slot->kobj);
- slot = NULL;
- goto err;
+ if (slot->hotplug) {
+ err = -EBUSY;
+ goto put_slot;
}
+ err = rename_slot(slot, name);
+ if (err)
+ goto put_slot;
}
goto out;
}
@@ -282,7 +262,7 @@ placeholder:
goto err;
}
- slot->bus = parent;
+ slot->bus = pci_bus_get(parent);
slot->number = slot_nr;
slot->kobj.kset = pci_slots_kset;
@@ -290,62 +270,42 @@ placeholder:
slot_name = make_slot_name(name);
if (!slot_name) {
err = -ENOMEM;
+ pci_bus_put(slot->bus);
+ kfree(slot);
goto err;
}
+ INIT_LIST_HEAD(&slot->list);
+ list_add(&slot->list, &parent->slots);
+
err = kobject_init_and_add(&slot->kobj, &pci_slot_ktype, NULL,
"%s", slot_name);
if (err)
- goto err;
-
- INIT_LIST_HEAD(&slot->list);
- list_add(&slot->list, &parent->slots);
+ goto put_slot;
+ down_read(&pci_bus_sem);
list_for_each_entry(dev, &parent->devices, bus_list)
if (PCI_SLOT(dev->devfn) == slot_nr)
dev->slot = slot;
+ up_read(&pci_bus_sem);
dev_dbg(&parent->dev, "dev %02x, created physical slot %s\n",
slot_nr, pci_slot_name(slot));
out:
kfree(slot_name);
- up_write(&pci_bus_sem);
+ mutex_unlock(&pci_slot_mutex);
return slot;
+
+put_slot:
+ kobject_put(&slot->kobj);
err:
- kfree(slot);
slot = ERR_PTR(err);
goto out;
}
EXPORT_SYMBOL_GPL(pci_create_slot);
/**
- * pci_renumber_slot - update %struct pci_slot -> number
- * @slot: &struct pci_slot to update
- * @slot_nr: new number for slot
- *
- * The primary purpose of this interface is to allow callers who earlier
- * created a placeholder slot in pci_create_slot() by passing a -1 as
- * slot_nr, to update their %struct pci_slot with the correct @slot_nr.
- */
-void pci_renumber_slot(struct pci_slot *slot, int slot_nr)
-{
- struct pci_slot *tmp;
-
- down_write(&pci_bus_sem);
-
- list_for_each_entry(tmp, &slot->bus->slots, list) {
- WARN_ON(tmp->number == slot_nr);
- goto out;
- }
-
- slot->number = slot_nr;
-out:
- up_write(&pci_bus_sem);
-}
-EXPORT_SYMBOL_GPL(pci_renumber_slot);
-
-/**
* pci_destroy_slot - decrement refcount for physical PCI slot
* @slot: struct pci_slot to decrement
*
@@ -356,56 +316,14 @@ EXPORT_SYMBOL_GPL(pci_renumber_slot);
void pci_destroy_slot(struct pci_slot *slot)
{
dev_dbg(&slot->bus->dev, "dev %02x, dec refcount to %d\n",
- slot->number, atomic_read(&slot->kobj.kref.refcount) - 1);
+ slot->number, kref_read(&slot->kobj.kref) - 1);
- down_write(&pci_bus_sem);
+ mutex_lock(&pci_slot_mutex);
kobject_put(&slot->kobj);
- up_write(&pci_bus_sem);
+ mutex_unlock(&pci_slot_mutex);
}
EXPORT_SYMBOL_GPL(pci_destroy_slot);
-#if defined(CONFIG_HOTPLUG_PCI) || defined(CONFIG_HOTPLUG_PCI_MODULE)
-#include <linux/pci_hotplug.h>
-/**
- * pci_hp_create_link - create symbolic link to the hotplug driver module.
- * @pci_slot: struct pci_slot
- *
- * Helper function for pci_hotplug_core.c to create symbolic link to
- * the hotplug driver module.
- */
-void pci_hp_create_module_link(struct pci_slot *pci_slot)
-{
- struct hotplug_slot *slot = pci_slot->hotplug;
- struct kobject *kobj = NULL;
- int ret;
-
- if (!slot || !slot->ops)
- return;
- kobj = kset_find_obj(module_kset, slot->ops->mod_name);
- if (!kobj)
- return;
- ret = sysfs_create_link(&pci_slot->kobj, kobj, "module");
- if (ret)
- dev_err(&pci_slot->bus->dev, "Error creating sysfs link (%d)\n",
- ret);
- kobject_put(kobj);
-}
-EXPORT_SYMBOL_GPL(pci_hp_create_module_link);
-
-/**
- * pci_hp_remove_link - remove symbolic link to the hotplug driver module.
- * @pci_slot: struct pci_slot
- *
- * Helper function for pci_hotplug_core.c to remove symbolic link to
- * the hotplug driver module.
- */
-void pci_hp_remove_module_link(struct pci_slot *pci_slot)
-{
- sysfs_remove_link(&pci_slot->kobj, "module");
-}
-EXPORT_SYMBOL_GPL(pci_hp_remove_module_link);
-#endif
-
static int pci_slot_init(void)
{
struct kset *pci_bus_kset;
@@ -414,7 +332,7 @@ static int pci_slot_init(void)
pci_slots_kset = kset_create_and_add("slots", NULL,
&pci_bus_kset->kobj);
if (!pci_slots_kset) {
- printk(KERN_ERR "PCI: Slot initialization failure\n");
+ pr_err("PCI: Slot initialization failure\n");
return -ENOMEM;
}
return 0;
generated by cgit (git 2.34.1) at 2025-12-25 08:19:26 +0000