// SPDX-License-Identifier: GPL-2.0+/* * CompactPCI Hot Plug Driver * * Copyright (C) 2002,2005 SOMA Networks, Inc. * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com) * Copyright (C) 2001 IBM Corp. * * All rights reserved. * * Send feedback to <scottm@somanetworks.com> */ #include <linux/module.h>#include <linux/kernel.h>#include <linux/sched/signal.h>#include <linux/slab.h>#include <linux/pci.h>#include <linux/pci_hotplug.h>#include <linux/init.h>#include <linux/interrupt.h>#include <linux/atomic.h>#include <linux/delay.h>#include <linux/kthread.h>#include "cpci_hotplug.h" #define DRIVER_AUTHOR	"Scott Murray <scottm@somanetworks.com>"#define DRIVER_DESC	"CompactPCI Hot Plug Core" #define MY_NAME	"cpci_hotplug" #define dbg(format, arg...)					\	do {							\		if (cpci_debug)					\			printk(KERN_DEBUG "%s: " format "\n",	\				MY_NAME, ## arg);		\	} while (0)#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg) /* local variables */static DECLARE_RWSEM(list_rwsem);static LIST_HEAD(slot_list);static int slots;static atomic_t extracting;int cpci_debug;static struct cpci_hp_controller *controller;static struct task_struct *cpci_thread;static int thread_finished; static int enable_slot(struct hotplug_slot *slot);static int disable_slot(struct hotplug_slot *slot);static int set_attention_status(struct hotplug_slot *slot, u8 value);static int get_power_status(struct hotplug_slot *slot, u8 *value);static int get_attention_status(struct hotplug_slot *slot, u8 *value);static int get_adapter_status(struct hotplug_slot *slot, u8 *value);static int get_latch_status(struct hotplug_slot *slot, u8 *value); static const struct hotplug_slot_ops cpci_hotplug_slot_ops = {	.enable_slot = enable_slot,	.disable_slot = disable_slot,	.set_attention_status = set_attention_status,	.get_power_status = get_power_status,	.get_attention_status = get_attention_status,	.get_adapter_status = get_adapter_status,	.get_latch_status = get_latch_status,}; static intenable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = to_slot(hotplug_slot); 	dbg("%s - physical_slot = %s", __func__, slot_name(slot)); 	return 0;} static intdisable_slot(struct hotplug_slot *hotplug_slot){	struct slot *slot = to_slot(hotplug_slot);	int retval = 0; 	dbg("%s - physical_slot = %s", __func__, slot_name(slot)); 	down_write(&list_rwsem); 	/* Unconfigure device */	dbg("%s - unconfiguring slot %s", __func__, slot_name(slot));	retval = cpci_unconfigure_slot(slot);	if (retval) {		err("%s - could not unconfigure slot %s",		    __func__, slot_name(slot));		goto disable_error;	}	dbg("%s - finished unconfiguring slot %s", __func__, slot_name(slot)); 	/* Clear EXT (by setting it) */	if (cpci_clear_ext(slot)) {		err("%s - could not clear EXT for slot %s",		    __func__, slot_name(slot));		retval = -ENODEV;		goto disable_error;	}	cpci_led_on(slot); 	slot->adapter_status = 0; 	if (slot->extracting) {		slot->extracting = 0;		atomic_dec(&extracting);	}disable_error:	up_write(&list_rwsem);	return retval;} static u8cpci_get_power_status(struct slot *slot){	return 1;} static intget_power_status(struct hotplug_slot *hotplug_slot, u8 *value){	struct slot *slot = to_slot(hotplug_slot); 	*value = cpci_get_power_status(slot);	return 0;} static intget_attention_status(struct hotplug_slot *hotplug_slot, u8 *value){	struct slot *slot = to_slot(hotplug_slot); 	*value = cpci_get_attention_status(slot);	return 0;} static intset_attention_status(struct hotplug_slot *hotplug_slot, u8 status){	return cpci_set_attention_status(to_slot(hotplug_slot), status);} static intget_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value){	struct slot *slot = to_slot(hotplug_slot); 	*value = slot->adapter_status;	return 0;} static intget_latch_status(struct hotplug_slot *hotplug_slot, u8 *value){	struct slot *slot = to_slot(hotplug_slot); 	*value = slot->latch_status;	return 0;} static void release_slot(struct slot *slot){	pci_dev_put(slot->dev);	kfree(slot);} #define SLOT_NAME_SIZE	6 intcpci_hp_register_bus(struct pci_bus *bus, u8 first, u8 last){	struct slot *slot;	char name[SLOT_NAME_SIZE];	int status;	int i; 	if (!(controller && bus))		return -ENODEV; 	/*	 * Create a structure for each slot, and register that slot	 * with the pci_hotplug subsystem.	 */	for (i = first; i <= last; ++i) {		slot = kzalloc_obj(struct slot);		if (!slot) {			status = -ENOMEM;			goto error;		} 		slot->bus = bus;		slot->number = i;		slot->devfn = PCI_DEVFN(i, 0); 		snprintf(name, SLOT_NAME_SIZE, "%02x:%02x", bus->number, i); 		slot->hotplug_slot.ops = &cpci_hotplug_slot_ops; 		dbg("registering slot %s", name);		status = pci_hp_register(&slot->hotplug_slot, bus, i, name);		if (status) {			err("pci_hp_register failed with error %d", status);			goto error_slot;		}		dbg("slot registered with name: %s", slot_name(slot)); 		/* Add slot to our internal list */		down_write(&list_rwsem);		list_add(&slot->slot_list, &slot_list);		slots++;		up_write(&list_rwsem);	}	return 0;error_slot:	kfree(slot);error:	return status;}EXPORT_SYMBOL_GPL(cpci_hp_register_bus); intcpci_hp_unregister_bus(struct pci_bus *bus){	struct slot *slot;	struct slot *tmp;	int status = 0; 	down_write(&list_rwsem);	if (!slots) {		up_write(&list_rwsem);		return -1;	}	list_for_each_entry_safe(slot, tmp, &slot_list, slot_list) {		if (slot->bus == bus) {			list_del(&slot->slot_list);			slots--; 			dbg("deregistering slot %s", slot_name(slot));			pci_hp_deregister(&slot->hotplug_slot);			release_slot(slot);		}	}	up_write(&list_rwsem);	return status;}EXPORT_SYMBOL_GPL(cpci_hp_unregister_bus); /* This is the interrupt mode interrupt handler */static irqreturn_tcpci_hp_intr(int irq, void *data){	dbg("entered cpci_hp_intr"); 	/* Check to see if it was our interrupt */	if ((controller->irq_flags & IRQF_SHARED) &&	    !controller->ops->check_irq(controller->dev_id)) {		dbg("exited cpci_hp_intr, not our interrupt");		return IRQ_NONE;	} 	/* Disable ENUM interrupt */	controller->ops->disable_irq(); 	/* Trigger processing by the event thread */	wake_up_process(cpci_thread);	return IRQ_HANDLED;} /* * According to PICMG 2.1 R2.0, section 6.3.2, upon * initialization, the system driver shall clear the * INS bits of the cold-inserted devices. */static intinit_slots(int clear_ins){	struct slot *slot;	struct pci_dev *dev; 	dbg("%s - enter", __func__);	down_read(&list_rwsem);	if (!slots) {		up_read(&list_rwsem);		return -1;	}	list_for_each_entry(slot, &slot_list, slot_list) {		dbg("%s - looking at slot %s", __func__, slot_name(slot));		if (clear_ins && cpci_check_and_clear_ins(slot))			dbg("%s - cleared INS for slot %s",			    __func__, slot_name(slot));		dev = pci_get_slot(slot->bus, PCI_DEVFN(slot->number, 0));		if (dev) {			slot->adapter_status = 1;			slot->latch_status = 1;			slot->dev = dev;		}	}	up_read(&list_rwsem);	dbg("%s - exit", __func__);	return 0;} static intcheck_slots(void){	struct slot *slot;	int extracted;	int inserted;	u16 hs_csr; 	down_read(&list_rwsem);	if (!slots) {		up_read(&list_rwsem);		err("no slots registered, shutting down");		return -1;	}	extracted = inserted = 0;	list_for_each_entry(slot, &slot_list, slot_list) {		dbg("%s - looking at slot %s", __func__, slot_name(slot));		if (cpci_check_and_clear_ins(slot)) {			/*			 * Some broken hardware (e.g. PLX 9054AB) asserts			 * ENUM# twice...			 */			if (slot->dev) {				warn("slot %s already inserted",				     slot_name(slot));				inserted++;				continue;			} 			/* Process insertion */			dbg("%s - slot %s inserted", __func__, slot_name(slot)); 			/* GSM, debug */			hs_csr = cpci_get_hs_csr(slot);			dbg("%s - slot %s HS_CSR (1) = %04x",			    __func__, slot_name(slot), hs_csr); 			/* Configure device */			dbg("%s - configuring slot %s",			    __func__, slot_name(slot));			if (cpci_configure_slot(slot)) {				err("%s - could not configure slot %s",				    __func__, slot_name(slot));				continue;			}			dbg("%s - finished configuring slot %s",			    __func__, slot_name(slot)); 			/* GSM, debug */			hs_csr = cpci_get_hs_csr(slot);			dbg("%s - slot %s HS_CSR (2) = %04x",			    __func__, slot_name(slot), hs_csr); 			slot->latch_status = 1;			slot->adapter_status = 1; 			cpci_led_off(slot); 			/* GSM, debug */			hs_csr = cpci_get_hs_csr(slot);			dbg("%s - slot %s HS_CSR (3) = %04x",			    __func__, slot_name(slot), hs_csr); 			inserted++;		} else if (cpci_check_ext(slot)) {			/* Process extraction request */			dbg("%s - slot %s extracted",			    __func__, slot_name(slot)); 			/* GSM, debug */			hs_csr = cpci_get_hs_csr(slot);			dbg("%s - slot %s HS_CSR = %04x",			    __func__, slot_name(slot), hs_csr); 			if (!slot->extracting) {				slot->latch_status = 0;				slot->extracting = 1;				atomic_inc(&extracting);			}			extracted++;		} else if (slot->extracting) {			hs_csr = cpci_get_hs_csr(slot);			if (hs_csr == 0xffff) {				/*				 * Hmmm, we're likely hosed at this point, should we				 * bother trying to tell the driver or not?				 */				err("card in slot %s was improperly removed",				    slot_name(slot));				slot->adapter_status = 0;				slot->extracting = 0;				atomic_dec(&extracting);			}		}	}	up_read(&list_rwsem);	dbg("inserted=%d, extracted=%d, extracting=%d",	    inserted, extracted, atomic_read(&extracting));	if (inserted || extracted)		return extracted;	else if (!atomic_read(&extracting)) {		err("cannot find ENUM# source, shutting down");		return -1;	}	return 0;} /* This is the interrupt mode worker thread body */static intevent_thread(void *data){	int rc; 	dbg("%s - event thread started", __func__);	while (1) {		dbg("event thread sleeping");		set_current_state(TASK_INTERRUPTIBLE);		schedule();		if (kthread_should_stop())			break;		do {			rc = check_slots();			if (rc > 0) {				/* Give userspace a chance to handle extraction */				msleep(500);			} else if (rc < 0) {				dbg("%s - error checking slots", __func__);				thread_finished = 1;				goto out;			}		} while (atomic_read(&extracting) && !kthread_should_stop());		if (kthread_should_stop())			break; 		/* Re-enable ENUM# interrupt */		dbg("%s - re-enabling irq", __func__);		controller->ops->enable_irq();	} out:	return 0;} /* This is the polling mode worker thread body */static intpoll_thread(void *data){	int rc; 	while (1) {		if (kthread_should_stop() || signal_pending(current))			break;		if (controller->ops->query_enum()) {			do {				rc = check_slots();				if (rc > 0) {					/* Give userspace a chance to handle extraction */					msleep(500);				} else if (rc < 0) {					dbg("%s - error checking slots", __func__);					thread_finished = 1;					goto out;				}			} while (atomic_read(&extracting) && !kthread_should_stop());		}		msleep(100);	} out:	return 0;} static intcpci_start_thread(void){	if (controller->irq)		cpci_thread = kthread_run(event_thread, NULL, "cpci_hp_eventd");	else		cpci_thread = kthread_run(poll_thread, NULL, "cpci_hp_polld");	if (IS_ERR(cpci_thread)) {		err("Can't start up our thread");		return PTR_ERR(cpci_thread);	}	thread_finished = 0;	return 0;} static voidcpci_stop_thread(void){	kthread_stop(cpci_thread);	thread_finished = 1;}

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