![Lukas Wunner](/assets/img/avatar_default.png)
When the PCI hotplug core and its first user, cpqphp, were introduced in February 2002 with historic commit a8a2069f432c, cpqphp allocated a slot struct for its internal use plus a hotplug_slot struct to be registered with the hotplug core and linked the two with pointers: https://git.kernel.org/tglx/history/c/a8a2069f432c Nowadays, the predominant pattern in the tree is to embed ("subclass") such structures in one another and cast to the containing struct with container_of(). But it wasn't until July 2002 that container_of() was introduced with historic commit ec4f214232cf: https://git.kernel.org/tglx/history/c/ec4f214232cf pnv_php, introduced in 2016, did the right thing and embedded struct hotplug_slot in its internal struct pnv_php_slot, but all other drivers cargo-culted cpqphp's design and linked separate structs with pointers. Embedding structs is preferrable to linking them with pointers because it requires fewer allocations, thereby reducing overhead and simplifying error paths. Casting an embedded struct to the containing struct becomes a cheap subtraction rather than a dereference. And having fewer pointers reduces the risk of them pointing nowhere either accidentally or due to an attack. Convert all drivers to embed struct hotplug_slot in their internal slot struct. The "private" pointer in struct hotplug_slot thereby becomes unused, so drop it. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> # drivers/pci/hotplug/rpa* Acked-by: Sebastian Ott <sebott@linux.ibm.com> # drivers/pci/hotplug/s390* Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> # drivers/platform/x86 Cc: Len Brown <lenb@kernel.org> Cc: Scott Murray <scott@spiteful.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Oliver OHalloran <oliveroh@au1.ibm.com> Cc: Gavin Shan <gwshan@linux.vnet.ibm.com> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> Cc: Corentin Chary <corentin.chary@gmail.com> Cc: Darren Hart <dvhart@infradead.org>
646 lines
14 KiB
C
646 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* CompactPCI Hot Plug Driver
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*
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* Copyright (C) 2002,2005 SOMA Networks, Inc.
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* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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*
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* All rights reserved.
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*
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* Send feedback to <scottm@somanetworks.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/atomic.h>
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#include <linux/delay.h>
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#include <linux/kthread.h>
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#include "cpci_hotplug.h"
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#define DRIVER_AUTHOR "Scott Murray <scottm@somanetworks.com>"
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#define DRIVER_DESC "CompactPCI Hot Plug Core"
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#define MY_NAME "cpci_hotplug"
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#define dbg(format, arg...) \
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do { \
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if (cpci_debug) \
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printk(KERN_DEBUG "%s: " format "\n", \
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MY_NAME, ## arg); \
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} while (0)
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#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)
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#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)
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#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg)
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/* local variables */
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static DECLARE_RWSEM(list_rwsem);
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static LIST_HEAD(slot_list);
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static int slots;
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static atomic_t extracting;
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int cpci_debug;
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static struct cpci_hp_controller *controller;
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static struct task_struct *cpci_thread;
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static int thread_finished;
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static int enable_slot(struct hotplug_slot *slot);
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static int disable_slot(struct hotplug_slot *slot);
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static int set_attention_status(struct hotplug_slot *slot, u8 value);
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static int get_power_status(struct hotplug_slot *slot, u8 *value);
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static int get_attention_status(struct hotplug_slot *slot, u8 *value);
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static int get_adapter_status(struct hotplug_slot *slot, u8 *value);
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static int get_latch_status(struct hotplug_slot *slot, u8 *value);
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static const struct hotplug_slot_ops cpci_hotplug_slot_ops = {
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.enable_slot = enable_slot,
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.disable_slot = disable_slot,
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.set_attention_status = set_attention_status,
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.get_power_status = get_power_status,
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.get_attention_status = get_attention_status,
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.get_adapter_status = get_adapter_status,
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.get_latch_status = get_latch_status,
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};
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static int
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enable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = to_slot(hotplug_slot);
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int retval = 0;
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dbg("%s - physical_slot = %s", __func__, slot_name(slot));
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if (controller->ops->set_power)
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retval = controller->ops->set_power(slot, 1);
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return retval;
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}
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static int
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disable_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = to_slot(hotplug_slot);
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int retval = 0;
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dbg("%s - physical_slot = %s", __func__, slot_name(slot));
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down_write(&list_rwsem);
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/* Unconfigure device */
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dbg("%s - unconfiguring slot %s", __func__, slot_name(slot));
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retval = cpci_unconfigure_slot(slot);
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if (retval) {
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err("%s - could not unconfigure slot %s",
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__func__, slot_name(slot));
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goto disable_error;
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}
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dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot));
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/* Clear EXT (by setting it) */
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if (cpci_clear_ext(slot)) {
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err("%s - could not clear EXT for slot %s",
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__func__, slot_name(slot));
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retval = -ENODEV;
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goto disable_error;
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}
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cpci_led_on(slot);
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if (controller->ops->set_power) {
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retval = controller->ops->set_power(slot, 0);
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if (retval)
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goto disable_error;
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}
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slot->adapter_status = 0;
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if (slot->extracting) {
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slot->extracting = 0;
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atomic_dec(&extracting);
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}
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disable_error:
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up_write(&list_rwsem);
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return retval;
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}
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static u8
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cpci_get_power_status(struct slot *slot)
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{
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u8 power = 1;
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if (controller->ops->get_power)
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power = controller->ops->get_power(slot);
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return power;
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}
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static int
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get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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*value = cpci_get_power_status(slot);
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return 0;
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}
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static int
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get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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*value = cpci_get_attention_status(slot);
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return 0;
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}
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static int
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set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
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{
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return cpci_set_attention_status(to_slot(hotplug_slot), status);
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}
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static int
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get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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*value = slot->adapter_status;
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return 0;
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}
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static int
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get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = to_slot(hotplug_slot);
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*value = slot->latch_status;
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return 0;
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}
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static void release_slot(struct slot *slot)
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{
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pci_dev_put(slot->dev);
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kfree(slot);
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}
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#define SLOT_NAME_SIZE 6
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int
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cpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last)
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{
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struct slot *slot;
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char name[SLOT_NAME_SIZE];
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int status;
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int i;
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if (!(controller && bus))
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return -ENODEV;
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/*
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* Create a structure for each slot, and register that slot
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* with the pci_hotplug subsystem.
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*/
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for (i = first; i <= last; ++i) {
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slot = kzalloc(sizeof(struct slot), GFP_KERNEL);
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if (!slot) {
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status = -ENOMEM;
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goto error;
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}
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slot->bus = bus;
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slot->number = i;
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slot->devfn = PCI_DEVFN(i, 0);
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snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i);
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slot->hotplug_slot.ops = &cpci_hotplug_slot_ops;
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dbg("registering slot %s", name);
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status = pci_hp_register(&slot->hotplug_slot, bus, i, name);
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if (status) {
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err("pci_hp_register failed with error %d", status);
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goto error_slot;
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}
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dbg("slot registered with name: %s", slot_name(slot));
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/* Add slot to our internal list */
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down_write(&list_rwsem);
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list_add(&slot->slot_list, &slot_list);
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slots++;
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up_write(&list_rwsem);
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}
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return 0;
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error_slot:
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kfree(slot);
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error:
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return status;
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}
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EXPORT_SYMBOL_GPL(cpci_hp_register_bus);
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int
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cpci_hp_unregister_bus(struct pci_bus *bus)
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{
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struct slot *slot;
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struct slot *tmp;
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int status = 0;
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down_write(&list_rwsem);
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if (!slots) {
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up_write(&list_rwsem);
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return -1;
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}
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list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
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if (slot->bus == bus) {
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list_del(&slot->slot_list);
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slots--;
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dbg("deregistering slot %s", slot_name(slot));
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pci_hp_deregister(&slot->hotplug_slot);
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release_slot(slot);
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}
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}
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up_write(&list_rwsem);
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return status;
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}
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EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus);
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/* This is the interrupt mode interrupt handler */
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static irqreturn_t
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cpci_hp_intr(int irq, void *data)
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{
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dbg("entered cpci_hp_intr");
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/* Check to see if it was our interrupt */
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if ((controller->irq_flags & IRQF_SHARED) &&
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!controller->ops->check_irq(controller->dev_id)) {
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dbg("exited cpci_hp_intr, not our interrupt");
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return IRQ_NONE;
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}
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/* Disable ENUM interrupt */
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controller->ops->disable_irq();
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/* Trigger processing by the event thread */
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wake_up_process(cpci_thread);
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return IRQ_HANDLED;
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}
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/*
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* According to PICMG 2.1 R2.0, section 6.3.2, upon
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* initialization, the system driver shall clear the
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* INS bits of the cold-inserted devices.
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*/
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static int
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init_slots(int clear_ins)
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{
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struct slot *slot;
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struct pci_dev *dev;
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dbg("%s - enter", __func__);
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down_read(&list_rwsem);
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if (!slots) {
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up_read(&list_rwsem);
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return -1;
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}
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list_for_each_entry(slot, &slot_list, slot_list) {
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dbg("%s - looking at slot %s", __func__, slot_name(slot));
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if (clear_ins && cpci_check_and_clear_ins(slot))
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dbg("%s - cleared INS for slot %s",
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__func__, slot_name(slot));
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dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));
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if (dev) {
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slot->adapter_status = 1;
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slot->latch_status = 1;
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slot->dev = dev;
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}
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}
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up_read(&list_rwsem);
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dbg("%s - exit", __func__);
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return 0;
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}
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static int
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check_slots(void)
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{
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struct slot *slot;
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int extracted;
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int inserted;
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u16 hs_csr;
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down_read(&list_rwsem);
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if (!slots) {
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up_read(&list_rwsem);
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err("no slots registered, shutting down");
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return -1;
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}
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extracted = inserted = 0;
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list_for_each_entry(slot, &slot_list, slot_list) {
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dbg("%s - looking at slot %s", __func__, slot_name(slot));
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if (cpci_check_and_clear_ins(slot)) {
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/*
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* Some broken hardware (e.g. PLX 9054AB) asserts
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* ENUM# twice...
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*/
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if (slot->dev) {
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warn("slot %s already inserted",
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slot_name(slot));
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inserted++;
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continue;
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}
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/* Process insertion */
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dbg("%s - slot %s inserted", __func__, slot_name(slot));
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/* GSM, debug */
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hs_csr = cpci_get_hs_csr(slot);
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dbg("%s - slot %s HS_CSR (1) = %04x",
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__func__, slot_name(slot), hs_csr);
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/* Configure device */
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dbg("%s - configuring slot %s",
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__func__, slot_name(slot));
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if (cpci_configure_slot(slot)) {
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err("%s - could not configure slot %s",
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__func__, slot_name(slot));
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continue;
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}
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dbg("%s - finished configuring slot %s",
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__func__, slot_name(slot));
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/* GSM, debug */
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hs_csr = cpci_get_hs_csr(slot);
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dbg("%s - slot %s HS_CSR (2) = %04x",
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__func__, slot_name(slot), hs_csr);
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slot->latch_status = 1;
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slot->adapter_status = 1;
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cpci_led_off(slot);
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/* GSM, debug */
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hs_csr = cpci_get_hs_csr(slot);
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dbg("%s - slot %s HS_CSR (3) = %04x",
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__func__, slot_name(slot), hs_csr);
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inserted++;
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} else if (cpci_check_ext(slot)) {
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/* Process extraction request */
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dbg("%s - slot %s extracted",
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__func__, slot_name(slot));
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/* GSM, debug */
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hs_csr = cpci_get_hs_csr(slot);
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dbg("%s - slot %s HS_CSR = %04x",
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__func__, slot_name(slot), hs_csr);
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if (!slot->extracting) {
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slot->latch_status = 0;
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slot->extracting = 1;
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atomic_inc(&extracting);
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}
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extracted++;
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} else if (slot->extracting) {
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hs_csr = cpci_get_hs_csr(slot);
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if (hs_csr == 0xffff) {
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/*
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* Hmmm, we're likely hosed at this point, should we
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* bother trying to tell the driver or not?
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*/
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err("card in slot %s was improperly removed",
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slot_name(slot));
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slot->adapter_status = 0;
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slot->extracting = 0;
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atomic_dec(&extracting);
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}
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}
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}
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up_read(&list_rwsem);
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dbg("inserted=%d, extracted=%d, extracting=%d",
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inserted, extracted, atomic_read(&extracting));
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if (inserted || extracted)
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return extracted;
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else if (!atomic_read(&extracting)) {
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err("cannot find ENUM# source, shutting down");
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return -1;
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}
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return 0;
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}
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/* This is the interrupt mode worker thread body */
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static int
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event_thread(void *data)
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{
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int rc;
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dbg("%s - event thread started", __func__);
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while (1) {
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dbg("event thread sleeping");
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set_current_state(TASK_INTERRUPTIBLE);
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schedule();
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if (kthread_should_stop())
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break;
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do {
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rc = check_slots();
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if (rc > 0) {
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/* Give userspace a chance to handle extraction */
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msleep(500);
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} else if (rc < 0) {
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dbg("%s - error checking slots", __func__);
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thread_finished = 1;
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goto out;
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}
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} while (atomic_read(&extracting) && !kthread_should_stop());
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if (kthread_should_stop())
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break;
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/* Re-enable ENUM# interrupt */
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dbg("%s - re-enabling irq", __func__);
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controller->ops->enable_irq();
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}
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out:
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return 0;
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}
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/* This is the polling mode worker thread body */
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static int
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poll_thread(void *data)
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{
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int rc;
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while (1) {
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if (kthread_should_stop() || signal_pending(current))
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break;
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if (controller->ops->query_enum()) {
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do {
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rc = check_slots();
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if (rc > 0) {
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/* Give userspace a chance to handle extraction */
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msleep(500);
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} else if (rc < 0) {
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dbg("%s - error checking slots", __func__);
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thread_finished = 1;
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goto out;
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}
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} while (atomic_read(&extracting) && !kthread_should_stop());
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}
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msleep(100);
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}
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out:
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return 0;
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}
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static int
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cpci_start_thread(void)
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{
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if (controller->irq)
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cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd");
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else
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cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld");
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if (IS_ERR(cpci_thread)) {
|
|
err("Can't start up our thread");
|
|
return PTR_ERR(cpci_thread);
|
|
}
|
|
thread_finished = 0;
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cpci_stop_thread(void)
|
|
{
|
|
kthread_stop(cpci_thread);
|
|
thread_finished = 1;
|
|
}
|
|
|
|
int
|
|
cpci_hp_register_controller(struct cpci_hp_controller *new_controller)
|
|
{
|
|
int status = 0;
|
|
|
|
if (controller)
|
|
return -1;
|
|
if (!(new_controller && new_controller->ops))
|
|
return -EINVAL;
|
|
if (new_controller->irq) {
|
|
if (!(new_controller->ops->enable_irq &&
|
|
new_controller->ops->disable_irq))
|
|
status = -EINVAL;
|
|
if (request_irq(new_controller->irq,
|
|
cpci_hp_intr,
|
|
new_controller->irq_flags,
|
|
MY_NAME,
|
|
new_controller->dev_id)) {
|
|
err("Can't get irq %d for the hotplug cPCI controller",
|
|
new_controller->irq);
|
|
status = -ENODEV;
|
|
}
|
|
dbg("%s - acquired controller irq %d",
|
|
__func__, new_controller->irq);
|
|
}
|
|
if (!status)
|
|
controller = new_controller;
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpci_hp_register_controller);
|
|
|
|
static void
|
|
cleanup_slots(void)
|
|
{
|
|
struct slot *slot;
|
|
struct slot *tmp;
|
|
|
|
/*
|
|
* Unregister all of our slots with the pci_hotplug subsystem,
|
|
* and free up all memory that we had allocated.
|
|
*/
|
|
down_write(&list_rwsem);
|
|
if (!slots)
|
|
goto cleanup_null;
|
|
list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {
|
|
list_del(&slot->slot_list);
|
|
pci_hp_deregister(&slot->hotplug_slot);
|
|
release_slot(slot);
|
|
}
|
|
cleanup_null:
|
|
up_write(&list_rwsem);
|
|
return;
|
|
}
|
|
|
|
int
|
|
cpci_hp_unregister_controller(struct cpci_hp_controller *old_controller)
|
|
{
|
|
int status = 0;
|
|
|
|
if (controller) {
|
|
if (!thread_finished)
|
|
cpci_stop_thread();
|
|
if (controller->irq)
|
|
free_irq(controller->irq, controller->dev_id);
|
|
controller = NULL;
|
|
cleanup_slots();
|
|
} else
|
|
status = -ENODEV;
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpci_hp_unregister_controller);
|
|
|
|
int
|
|
cpci_hp_start(void)
|
|
{
|
|
static int first = 1;
|
|
int status;
|
|
|
|
dbg("%s - enter", __func__);
|
|
if (!controller)
|
|
return -ENODEV;
|
|
|
|
down_read(&list_rwsem);
|
|
if (list_empty(&slot_list)) {
|
|
up_read(&list_rwsem);
|
|
return -ENODEV;
|
|
}
|
|
up_read(&list_rwsem);
|
|
|
|
status = init_slots(first);
|
|
if (first)
|
|
first = 0;
|
|
if (status)
|
|
return status;
|
|
|
|
status = cpci_start_thread();
|
|
if (status)
|
|
return status;
|
|
dbg("%s - thread started", __func__);
|
|
|
|
if (controller->irq) {
|
|
/* Start enum interrupt processing */
|
|
dbg("%s - enabling irq", __func__);
|
|
controller->ops->enable_irq();
|
|
}
|
|
dbg("%s - exit", __func__);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpci_hp_start);
|
|
|
|
int
|
|
cpci_hp_stop(void)
|
|
{
|
|
if (!controller)
|
|
return -ENODEV;
|
|
if (controller->irq) {
|
|
/* Stop enum interrupt processing */
|
|
dbg("%s - disabling irq", __func__);
|
|
controller->ops->disable_irq();
|
|
}
|
|
cpci_stop_thread();
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cpci_hp_stop);
|
|
|
|
int __init
|
|
cpci_hotplug_init(int debug)
|
|
{
|
|
cpci_debug = debug;
|
|
return 0;
|
|
}
|