mirror of https://gitee.com/openkylin/linux.git
1750 lines
46 KiB
C
1750 lines
46 KiB
C
/*
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* linux/drivers/s390/crypto/ap_bus.c
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*
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* Copyright (C) 2006 IBM Corporation
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* Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Ralph Wuerthner <rwuerthn@de.ibm.com>
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* Felix Beck <felix.beck@de.ibm.com>
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*
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* Adjunct processor bus.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define KMSG_COMPONENT "ap"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/slab.h>
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#include <linux/notifier.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <asm/reset.h>
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#include <asm/airq.h>
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#include <asm/atomic.h>
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#include <asm/system.h>
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#include <asm/isc.h>
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#include <linux/hrtimer.h>
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#include <linux/ktime.h>
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#include "ap_bus.h"
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/* Some prototypes. */
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static void ap_scan_bus(struct work_struct *);
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static void ap_poll_all(unsigned long);
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static enum hrtimer_restart ap_poll_timeout(struct hrtimer *);
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static int ap_poll_thread_start(void);
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static void ap_poll_thread_stop(void);
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static void ap_request_timeout(unsigned long);
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static inline void ap_schedule_poll_timer(void);
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static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags);
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static int ap_device_remove(struct device *dev);
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static int ap_device_probe(struct device *dev);
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static void ap_interrupt_handler(void *unused1, void *unused2);
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static void ap_reset(struct ap_device *ap_dev);
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static void ap_config_timeout(unsigned long ptr);
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static int ap_select_domain(void);
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/*
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* Module description.
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*/
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MODULE_AUTHOR("IBM Corporation");
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MODULE_DESCRIPTION("Adjunct Processor Bus driver, "
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"Copyright 2006 IBM Corporation");
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MODULE_LICENSE("GPL");
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/*
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* Module parameter
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*/
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int ap_domain_index = -1; /* Adjunct Processor Domain Index */
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module_param_named(domain, ap_domain_index, int, 0000);
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MODULE_PARM_DESC(domain, "domain index for ap devices");
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EXPORT_SYMBOL(ap_domain_index);
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static int ap_thread_flag = 0;
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module_param_named(poll_thread, ap_thread_flag, int, 0000);
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MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
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static struct device *ap_root_device = NULL;
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static DEFINE_SPINLOCK(ap_device_list_lock);
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static LIST_HEAD(ap_device_list);
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/*
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* Workqueue & timer for bus rescan.
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*/
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static struct workqueue_struct *ap_work_queue;
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static struct timer_list ap_config_timer;
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static int ap_config_time = AP_CONFIG_TIME;
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static DECLARE_WORK(ap_config_work, ap_scan_bus);
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/*
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* Tasklet & timer for AP request polling and interrupts
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*/
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static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0);
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static atomic_t ap_poll_requests = ATOMIC_INIT(0);
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static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
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static struct task_struct *ap_poll_kthread = NULL;
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static DEFINE_MUTEX(ap_poll_thread_mutex);
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static DEFINE_SPINLOCK(ap_poll_timer_lock);
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static void *ap_interrupt_indicator;
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static struct hrtimer ap_poll_timer;
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/* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
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* If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.*/
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static unsigned long long poll_timeout = 250000;
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/* Suspend flag */
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static int ap_suspend_flag;
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/* Flag to check if domain was set through module parameter domain=. This is
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* important when supsend and resume is done in a z/VM environment where the
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* domain might change. */
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static int user_set_domain = 0;
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static struct bus_type ap_bus_type;
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/**
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* ap_using_interrupts() - Returns non-zero if interrupt support is
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* available.
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*/
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static inline int ap_using_interrupts(void)
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{
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return ap_interrupt_indicator != NULL;
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}
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/**
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* ap_intructions_available() - Test if AP instructions are available.
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*
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* Returns 0 if the AP instructions are installed.
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*/
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static inline int ap_instructions_available(void)
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{
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register unsigned long reg0 asm ("0") = AP_MKQID(0,0);
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register unsigned long reg1 asm ("1") = -ENODEV;
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register unsigned long reg2 asm ("2") = 0UL;
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asm volatile(
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" .long 0xb2af0000\n" /* PQAP(TAPQ) */
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"0: la %1,0\n"
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"1:\n"
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EX_TABLE(0b, 1b)
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: "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" );
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return reg1;
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}
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/**
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* ap_interrupts_available(): Test if AP interrupts are available.
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*
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* Returns 1 if AP interrupts are available.
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*/
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static int ap_interrupts_available(void)
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{
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unsigned long long facility_bits[2];
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if (stfle(facility_bits, 2) <= 1)
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return 0;
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if (!(facility_bits[0] & (1ULL << 61)) ||
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!(facility_bits[1] & (1ULL << 62)))
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return 0;
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return 1;
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}
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/**
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* ap_test_queue(): Test adjunct processor queue.
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* @qid: The AP queue number
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* @queue_depth: Pointer to queue depth value
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* @device_type: Pointer to device type value
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*
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* Returns AP queue status structure.
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*/
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static inline struct ap_queue_status
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ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type)
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{
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register unsigned long reg0 asm ("0") = qid;
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register struct ap_queue_status reg1 asm ("1");
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register unsigned long reg2 asm ("2") = 0UL;
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asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */
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: "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
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*device_type = (int) (reg2 >> 24);
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*queue_depth = (int) (reg2 & 0xff);
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return reg1;
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}
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/**
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* ap_reset_queue(): Reset adjunct processor queue.
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* @qid: The AP queue number
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*
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* Returns AP queue status structure.
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*/
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static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid)
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{
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register unsigned long reg0 asm ("0") = qid | 0x01000000UL;
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register struct ap_queue_status reg1 asm ("1");
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register unsigned long reg2 asm ("2") = 0UL;
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asm volatile(
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".long 0xb2af0000" /* PQAP(RAPQ) */
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: "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
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return reg1;
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}
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#ifdef CONFIG_64BIT
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/**
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* ap_queue_interruption_control(): Enable interruption for a specific AP.
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* @qid: The AP queue number
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* @ind: The notification indicator byte
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*
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* Returns AP queue status.
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*/
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static inline struct ap_queue_status
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ap_queue_interruption_control(ap_qid_t qid, void *ind)
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{
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register unsigned long reg0 asm ("0") = qid | 0x03000000UL;
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register unsigned long reg1_in asm ("1") = 0x0000800000000000UL | AP_ISC;
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register struct ap_queue_status reg1_out asm ("1");
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register void *reg2 asm ("2") = ind;
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asm volatile(
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".long 0xb2af0000" /* PQAP(RAPQ) */
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: "+d" (reg0), "+d" (reg1_in), "=d" (reg1_out), "+d" (reg2)
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:
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: "cc" );
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return reg1_out;
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}
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#endif
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/**
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* ap_queue_enable_interruption(): Enable interruption on an AP.
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* @qid: The AP queue number
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* @ind: the notification indicator byte
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*
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* Enables interruption on AP queue via ap_queue_interruption_control(). Based
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* on the return value it waits a while and tests the AP queue if interrupts
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* have been switched on using ap_test_queue().
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*/
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static int ap_queue_enable_interruption(ap_qid_t qid, void *ind)
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{
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#ifdef CONFIG_64BIT
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struct ap_queue_status status;
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int t_depth, t_device_type, rc, i;
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rc = -EBUSY;
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status = ap_queue_interruption_control(qid, ind);
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for (i = 0; i < AP_MAX_RESET; i++) {
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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if (status.int_enabled)
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return 0;
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break;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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case AP_RESPONSE_BUSY:
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break;
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case AP_RESPONSE_Q_NOT_AVAIL:
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case AP_RESPONSE_DECONFIGURED:
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case AP_RESPONSE_CHECKSTOPPED:
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case AP_RESPONSE_INVALID_ADDRESS:
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return -ENODEV;
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case AP_RESPONSE_OTHERWISE_CHANGED:
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if (status.int_enabled)
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return 0;
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break;
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default:
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break;
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}
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if (i < AP_MAX_RESET - 1) {
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udelay(5);
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status = ap_test_queue(qid, &t_depth, &t_device_type);
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}
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}
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return rc;
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#else
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return -EINVAL;
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#endif
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}
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/**
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* __ap_send(): Send message to adjunct processor queue.
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* @qid: The AP queue number
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* @psmid: The program supplied message identifier
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* @msg: The message text
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* @length: The message length
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* @special: Special Bit
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*
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* Returns AP queue status structure.
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* Condition code 1 on NQAP can't happen because the L bit is 1.
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* Condition code 2 on NQAP also means the send is incomplete,
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* because a segment boundary was reached. The NQAP is repeated.
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*/
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static inline struct ap_queue_status
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__ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length,
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unsigned int special)
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{
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typedef struct { char _[length]; } msgblock;
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register unsigned long reg0 asm ("0") = qid | 0x40000000UL;
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register struct ap_queue_status reg1 asm ("1");
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register unsigned long reg2 asm ("2") = (unsigned long) msg;
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register unsigned long reg3 asm ("3") = (unsigned long) length;
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register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32);
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register unsigned long reg5 asm ("5") = (unsigned int) psmid;
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if (special == 1)
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reg0 |= 0x400000UL;
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asm volatile (
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"0: .long 0xb2ad0042\n" /* DQAP */
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" brc 2,0b"
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: "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3)
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: "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg)
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: "cc" );
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return reg1;
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}
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int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
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{
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struct ap_queue_status status;
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status = __ap_send(qid, psmid, msg, length, 0);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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return 0;
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case AP_RESPONSE_Q_FULL:
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case AP_RESPONSE_RESET_IN_PROGRESS:
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return -EBUSY;
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case AP_RESPONSE_REQ_FAC_NOT_INST:
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return -EINVAL;
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default: /* Device is gone. */
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return -ENODEV;
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}
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}
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EXPORT_SYMBOL(ap_send);
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/**
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* __ap_recv(): Receive message from adjunct processor queue.
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* @qid: The AP queue number
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* @psmid: Pointer to program supplied message identifier
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* @msg: The message text
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* @length: The message length
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*
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* Returns AP queue status structure.
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* Condition code 1 on DQAP means the receive has taken place
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* but only partially. The response is incomplete, hence the
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* DQAP is repeated.
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* Condition code 2 on DQAP also means the receive is incomplete,
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* this time because a segment boundary was reached. Again, the
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* DQAP is repeated.
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* Note that gpr2 is used by the DQAP instruction to keep track of
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* any 'residual' length, in case the instruction gets interrupted.
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* Hence it gets zeroed before the instruction.
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*/
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static inline struct ap_queue_status
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__ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
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{
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typedef struct { char _[length]; } msgblock;
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register unsigned long reg0 asm("0") = qid | 0x80000000UL;
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register struct ap_queue_status reg1 asm ("1");
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register unsigned long reg2 asm("2") = 0UL;
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register unsigned long reg4 asm("4") = (unsigned long) msg;
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register unsigned long reg5 asm("5") = (unsigned long) length;
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register unsigned long reg6 asm("6") = 0UL;
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register unsigned long reg7 asm("7") = 0UL;
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asm volatile(
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"0: .long 0xb2ae0064\n"
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" brc 6,0b\n"
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: "+d" (reg0), "=d" (reg1), "+d" (reg2),
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"+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7),
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"=m" (*(msgblock *) msg) : : "cc" );
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*psmid = (((unsigned long long) reg6) << 32) + reg7;
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return reg1;
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}
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int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
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{
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struct ap_queue_status status;
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status = __ap_recv(qid, psmid, msg, length);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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return 0;
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case AP_RESPONSE_NO_PENDING_REPLY:
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if (status.queue_empty)
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return -ENOENT;
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return -EBUSY;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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return -EBUSY;
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default:
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return -ENODEV;
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}
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}
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EXPORT_SYMBOL(ap_recv);
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/**
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* ap_query_queue(): Check if an AP queue is available.
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* @qid: The AP queue number
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* @queue_depth: Pointer to queue depth value
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* @device_type: Pointer to device type value
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*
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* The test is repeated for AP_MAX_RESET times.
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*/
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static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type)
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{
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struct ap_queue_status status;
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int t_depth, t_device_type, rc, i;
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rc = -EBUSY;
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for (i = 0; i < AP_MAX_RESET; i++) {
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status = ap_test_queue(qid, &t_depth, &t_device_type);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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*queue_depth = t_depth + 1;
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*device_type = t_device_type;
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rc = 0;
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break;
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case AP_RESPONSE_Q_NOT_AVAIL:
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rc = -ENODEV;
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break;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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break;
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case AP_RESPONSE_DECONFIGURED:
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rc = -ENODEV;
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break;
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case AP_RESPONSE_CHECKSTOPPED:
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rc = -ENODEV;
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break;
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case AP_RESPONSE_INVALID_ADDRESS:
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rc = -ENODEV;
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break;
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case AP_RESPONSE_OTHERWISE_CHANGED:
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break;
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case AP_RESPONSE_BUSY:
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break;
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default:
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BUG();
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}
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if (rc != -EBUSY)
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break;
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if (i < AP_MAX_RESET - 1)
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udelay(5);
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}
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return rc;
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}
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/**
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* ap_init_queue(): Reset an AP queue.
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* @qid: The AP queue number
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*
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* Reset an AP queue and wait for it to become available again.
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*/
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static int ap_init_queue(ap_qid_t qid)
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{
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struct ap_queue_status status;
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int rc, dummy, i;
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rc = -ENODEV;
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status = ap_reset_queue(qid);
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for (i = 0; i < AP_MAX_RESET; i++) {
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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if (status.queue_empty)
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rc = 0;
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break;
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case AP_RESPONSE_Q_NOT_AVAIL:
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case AP_RESPONSE_DECONFIGURED:
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case AP_RESPONSE_CHECKSTOPPED:
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i = AP_MAX_RESET; /* return with -ENODEV */
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break;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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rc = -EBUSY;
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case AP_RESPONSE_BUSY:
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default:
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break;
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}
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if (rc != -ENODEV && rc != -EBUSY)
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break;
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if (i < AP_MAX_RESET - 1) {
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udelay(5);
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status = ap_test_queue(qid, &dummy, &dummy);
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}
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}
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if (rc == 0 && ap_using_interrupts()) {
|
|
rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator);
|
|
/* If interruption mode is supported by the machine,
|
|
* but an AP can not be enabled for interruption then
|
|
* the AP will be discarded. */
|
|
if (rc)
|
|
pr_err("Registering adapter interrupts for "
|
|
"AP %d failed\n", AP_QID_DEVICE(qid));
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ap_increase_queue_count(): Arm request timeout.
|
|
* @ap_dev: Pointer to an AP device.
|
|
*
|
|
* Arm request timeout if an AP device was idle and a new request is submitted.
|
|
*/
|
|
static void ap_increase_queue_count(struct ap_device *ap_dev)
|
|
{
|
|
int timeout = ap_dev->drv->request_timeout;
|
|
|
|
ap_dev->queue_count++;
|
|
if (ap_dev->queue_count == 1) {
|
|
mod_timer(&ap_dev->timeout, jiffies + timeout);
|
|
ap_dev->reset = AP_RESET_ARMED;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ap_decrease_queue_count(): Decrease queue count.
|
|
* @ap_dev: Pointer to an AP device.
|
|
*
|
|
* If AP device is still alive, re-schedule request timeout if there are still
|
|
* pending requests.
|
|
*/
|
|
static void ap_decrease_queue_count(struct ap_device *ap_dev)
|
|
{
|
|
int timeout = ap_dev->drv->request_timeout;
|
|
|
|
ap_dev->queue_count--;
|
|
if (ap_dev->queue_count > 0)
|
|
mod_timer(&ap_dev->timeout, jiffies + timeout);
|
|
else
|
|
/*
|
|
* The timeout timer should to be disabled now - since
|
|
* del_timer_sync() is very expensive, we just tell via the
|
|
* reset flag to ignore the pending timeout timer.
|
|
*/
|
|
ap_dev->reset = AP_RESET_IGNORE;
|
|
}
|
|
|
|
/*
|
|
* AP device related attributes.
|
|
*/
|
|
static ssize_t ap_hwtype_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->device_type);
|
|
}
|
|
|
|
static DEVICE_ATTR(hwtype, 0444, ap_hwtype_show, NULL);
|
|
static ssize_t ap_depth_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->queue_depth);
|
|
}
|
|
|
|
static DEVICE_ATTR(depth, 0444, ap_depth_show, NULL);
|
|
static ssize_t ap_request_count_show(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
int rc;
|
|
|
|
spin_lock_bh(&ap_dev->lock);
|
|
rc = snprintf(buf, PAGE_SIZE, "%d\n", ap_dev->total_request_count);
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
return rc;
|
|
}
|
|
|
|
static DEVICE_ATTR(request_count, 0444, ap_request_count_show, NULL);
|
|
|
|
static ssize_t ap_modalias_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "ap:t%02X", to_ap_dev(dev)->device_type);
|
|
}
|
|
|
|
static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
|
|
|
|
static struct attribute *ap_dev_attrs[] = {
|
|
&dev_attr_hwtype.attr,
|
|
&dev_attr_depth.attr,
|
|
&dev_attr_request_count.attr,
|
|
&dev_attr_modalias.attr,
|
|
NULL
|
|
};
|
|
static struct attribute_group ap_dev_attr_group = {
|
|
.attrs = ap_dev_attrs
|
|
};
|
|
|
|
/**
|
|
* ap_bus_match()
|
|
* @dev: Pointer to device
|
|
* @drv: Pointer to device_driver
|
|
*
|
|
* AP bus driver registration/unregistration.
|
|
*/
|
|
static int ap_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
struct ap_driver *ap_drv = to_ap_drv(drv);
|
|
struct ap_device_id *id;
|
|
|
|
/*
|
|
* Compare device type of the device with the list of
|
|
* supported types of the device_driver.
|
|
*/
|
|
for (id = ap_drv->ids; id->match_flags; id++) {
|
|
if ((id->match_flags & AP_DEVICE_ID_MATCH_DEVICE_TYPE) &&
|
|
(id->dev_type != ap_dev->device_type))
|
|
continue;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ap_uevent(): Uevent function for AP devices.
|
|
* @dev: Pointer to device
|
|
* @env: Pointer to kobj_uevent_env
|
|
*
|
|
* It sets up a single environment variable DEV_TYPE which contains the
|
|
* hardware device type.
|
|
*/
|
|
static int ap_uevent (struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
int retval = 0;
|
|
|
|
if (!ap_dev)
|
|
return -ENODEV;
|
|
|
|
/* Set up DEV_TYPE environment variable. */
|
|
retval = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
|
|
if (retval)
|
|
return retval;
|
|
|
|
/* Add MODALIAS= */
|
|
retval = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int ap_bus_suspend(struct device *dev, pm_message_t state)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
unsigned long flags;
|
|
|
|
if (!ap_suspend_flag) {
|
|
ap_suspend_flag = 1;
|
|
|
|
/* Disable scanning for devices, thus we do not want to scan
|
|
* for them after removing.
|
|
*/
|
|
del_timer_sync(&ap_config_timer);
|
|
if (ap_work_queue != NULL) {
|
|
destroy_workqueue(ap_work_queue);
|
|
ap_work_queue = NULL;
|
|
}
|
|
|
|
tasklet_disable(&ap_tasklet);
|
|
}
|
|
/* Poll on the device until all requests are finished. */
|
|
do {
|
|
flags = 0;
|
|
spin_lock_bh(&ap_dev->lock);
|
|
__ap_poll_device(ap_dev, &flags);
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
} while ((flags & 1) || (flags & 2));
|
|
|
|
spin_lock_bh(&ap_dev->lock);
|
|
ap_dev->unregistered = 1;
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ap_bus_resume(struct device *dev)
|
|
{
|
|
int rc = 0;
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
|
|
if (ap_suspend_flag) {
|
|
ap_suspend_flag = 0;
|
|
if (!ap_interrupts_available())
|
|
ap_interrupt_indicator = NULL;
|
|
if (!user_set_domain) {
|
|
ap_domain_index = -1;
|
|
ap_select_domain();
|
|
}
|
|
init_timer(&ap_config_timer);
|
|
ap_config_timer.function = ap_config_timeout;
|
|
ap_config_timer.data = 0;
|
|
ap_config_timer.expires = jiffies + ap_config_time * HZ;
|
|
add_timer(&ap_config_timer);
|
|
ap_work_queue = create_singlethread_workqueue("kapwork");
|
|
if (!ap_work_queue)
|
|
return -ENOMEM;
|
|
tasklet_enable(&ap_tasklet);
|
|
if (!ap_using_interrupts())
|
|
ap_schedule_poll_timer();
|
|
else
|
|
tasklet_schedule(&ap_tasklet);
|
|
if (ap_thread_flag)
|
|
rc = ap_poll_thread_start();
|
|
}
|
|
if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) {
|
|
spin_lock_bh(&ap_dev->lock);
|
|
ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid),
|
|
ap_domain_index);
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
}
|
|
queue_work(ap_work_queue, &ap_config_work);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static struct bus_type ap_bus_type = {
|
|
.name = "ap",
|
|
.match = &ap_bus_match,
|
|
.uevent = &ap_uevent,
|
|
.suspend = ap_bus_suspend,
|
|
.resume = ap_bus_resume
|
|
};
|
|
|
|
static int ap_device_probe(struct device *dev)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
struct ap_driver *ap_drv = to_ap_drv(dev->driver);
|
|
int rc;
|
|
|
|
ap_dev->drv = ap_drv;
|
|
rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
|
|
if (!rc) {
|
|
spin_lock_bh(&ap_device_list_lock);
|
|
list_add(&ap_dev->list, &ap_device_list);
|
|
spin_unlock_bh(&ap_device_list_lock);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* __ap_flush_queue(): Flush requests.
|
|
* @ap_dev: Pointer to the AP device
|
|
*
|
|
* Flush all requests from the request/pending queue of an AP device.
|
|
*/
|
|
static void __ap_flush_queue(struct ap_device *ap_dev)
|
|
{
|
|
struct ap_message *ap_msg, *next;
|
|
|
|
list_for_each_entry_safe(ap_msg, next, &ap_dev->pendingq, list) {
|
|
list_del_init(&ap_msg->list);
|
|
ap_dev->pendingq_count--;
|
|
ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
|
|
}
|
|
list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) {
|
|
list_del_init(&ap_msg->list);
|
|
ap_dev->requestq_count--;
|
|
ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
|
|
}
|
|
}
|
|
|
|
void ap_flush_queue(struct ap_device *ap_dev)
|
|
{
|
|
spin_lock_bh(&ap_dev->lock);
|
|
__ap_flush_queue(ap_dev);
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
}
|
|
EXPORT_SYMBOL(ap_flush_queue);
|
|
|
|
static int ap_device_remove(struct device *dev)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
struct ap_driver *ap_drv = ap_dev->drv;
|
|
|
|
ap_flush_queue(ap_dev);
|
|
del_timer_sync(&ap_dev->timeout);
|
|
spin_lock_bh(&ap_device_list_lock);
|
|
list_del_init(&ap_dev->list);
|
|
spin_unlock_bh(&ap_device_list_lock);
|
|
if (ap_drv->remove)
|
|
ap_drv->remove(ap_dev);
|
|
spin_lock_bh(&ap_dev->lock);
|
|
atomic_sub(ap_dev->queue_count, &ap_poll_requests);
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
return 0;
|
|
}
|
|
|
|
int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
|
|
char *name)
|
|
{
|
|
struct device_driver *drv = &ap_drv->driver;
|
|
|
|
drv->bus = &ap_bus_type;
|
|
drv->probe = ap_device_probe;
|
|
drv->remove = ap_device_remove;
|
|
drv->owner = owner;
|
|
drv->name = name;
|
|
return driver_register(drv);
|
|
}
|
|
EXPORT_SYMBOL(ap_driver_register);
|
|
|
|
void ap_driver_unregister(struct ap_driver *ap_drv)
|
|
{
|
|
driver_unregister(&ap_drv->driver);
|
|
}
|
|
EXPORT_SYMBOL(ap_driver_unregister);
|
|
|
|
/*
|
|
* AP bus attributes.
|
|
*/
|
|
static ssize_t ap_domain_show(struct bus_type *bus, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", ap_domain_index);
|
|
}
|
|
|
|
static BUS_ATTR(ap_domain, 0444, ap_domain_show, NULL);
|
|
|
|
static ssize_t ap_config_time_show(struct bus_type *bus, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", ap_config_time);
|
|
}
|
|
|
|
static ssize_t ap_interrupts_show(struct bus_type *bus, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n",
|
|
ap_using_interrupts() ? 1 : 0);
|
|
}
|
|
|
|
static BUS_ATTR(ap_interrupts, 0444, ap_interrupts_show, NULL);
|
|
|
|
static ssize_t ap_config_time_store(struct bus_type *bus,
|
|
const char *buf, size_t count)
|
|
{
|
|
int time;
|
|
|
|
if (sscanf(buf, "%d\n", &time) != 1 || time < 5 || time > 120)
|
|
return -EINVAL;
|
|
ap_config_time = time;
|
|
if (!timer_pending(&ap_config_timer) ||
|
|
!mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ)) {
|
|
ap_config_timer.expires = jiffies + ap_config_time * HZ;
|
|
add_timer(&ap_config_timer);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static BUS_ATTR(config_time, 0644, ap_config_time_show, ap_config_time_store);
|
|
|
|
static ssize_t ap_poll_thread_show(struct bus_type *bus, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", ap_poll_kthread ? 1 : 0);
|
|
}
|
|
|
|
static ssize_t ap_poll_thread_store(struct bus_type *bus,
|
|
const char *buf, size_t count)
|
|
{
|
|
int flag, rc;
|
|
|
|
if (sscanf(buf, "%d\n", &flag) != 1)
|
|
return -EINVAL;
|
|
if (flag) {
|
|
rc = ap_poll_thread_start();
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
else
|
|
ap_poll_thread_stop();
|
|
return count;
|
|
}
|
|
|
|
static BUS_ATTR(poll_thread, 0644, ap_poll_thread_show, ap_poll_thread_store);
|
|
|
|
static ssize_t poll_timeout_show(struct bus_type *bus, char *buf)
|
|
{
|
|
return snprintf(buf, PAGE_SIZE, "%llu\n", poll_timeout);
|
|
}
|
|
|
|
static ssize_t poll_timeout_store(struct bus_type *bus, const char *buf,
|
|
size_t count)
|
|
{
|
|
unsigned long long time;
|
|
ktime_t hr_time;
|
|
|
|
/* 120 seconds = maximum poll interval */
|
|
if (sscanf(buf, "%llu\n", &time) != 1 || time < 1 ||
|
|
time > 120000000000ULL)
|
|
return -EINVAL;
|
|
poll_timeout = time;
|
|
hr_time = ktime_set(0, poll_timeout);
|
|
|
|
if (!hrtimer_is_queued(&ap_poll_timer) ||
|
|
!hrtimer_forward(&ap_poll_timer, hrtimer_get_expires(&ap_poll_timer), hr_time)) {
|
|
hrtimer_set_expires(&ap_poll_timer, hr_time);
|
|
hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store);
|
|
|
|
static struct bus_attribute *const ap_bus_attrs[] = {
|
|
&bus_attr_ap_domain,
|
|
&bus_attr_config_time,
|
|
&bus_attr_poll_thread,
|
|
&bus_attr_ap_interrupts,
|
|
&bus_attr_poll_timeout,
|
|
NULL,
|
|
};
|
|
|
|
/**
|
|
* ap_select_domain(): Select an AP domain.
|
|
*
|
|
* Pick one of the 16 AP domains.
|
|
*/
|
|
static int ap_select_domain(void)
|
|
{
|
|
int queue_depth, device_type, count, max_count, best_domain;
|
|
int rc, i, j;
|
|
|
|
/*
|
|
* We want to use a single domain. Either the one specified with
|
|
* the "domain=" parameter or the domain with the maximum number
|
|
* of devices.
|
|
*/
|
|
if (ap_domain_index >= 0 && ap_domain_index < AP_DOMAINS)
|
|
/* Domain has already been selected. */
|
|
return 0;
|
|
best_domain = -1;
|
|
max_count = 0;
|
|
for (i = 0; i < AP_DOMAINS; i++) {
|
|
count = 0;
|
|
for (j = 0; j < AP_DEVICES; j++) {
|
|
ap_qid_t qid = AP_MKQID(j, i);
|
|
rc = ap_query_queue(qid, &queue_depth, &device_type);
|
|
if (rc)
|
|
continue;
|
|
count++;
|
|
}
|
|
if (count > max_count) {
|
|
max_count = count;
|
|
best_domain = i;
|
|
}
|
|
}
|
|
if (best_domain >= 0){
|
|
ap_domain_index = best_domain;
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
/**
|
|
* ap_probe_device_type(): Find the device type of an AP.
|
|
* @ap_dev: pointer to the AP device.
|
|
*
|
|
* Find the device type if query queue returned a device type of 0.
|
|
*/
|
|
static int ap_probe_device_type(struct ap_device *ap_dev)
|
|
{
|
|
static unsigned char msg[] = {
|
|
0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x58,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x01,0x00,0x43,0x43,0x41,0x2d,0x41,0x50,
|
|
0x50,0x4c,0x20,0x20,0x20,0x01,0x01,0x01,
|
|
0x00,0x00,0x00,0x00,0x50,0x4b,0x00,0x00,
|
|
0x00,0x00,0x01,0x1c,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x05,0xb8,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x70,0x00,0x41,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x54,0x32,0x01,0x00,0xa0,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0xb8,0x05,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x0a,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
|
|
0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x00,
|
|
0x49,0x43,0x53,0x46,0x20,0x20,0x20,0x20,
|
|
0x50,0x4b,0x0a,0x00,0x50,0x4b,0x43,0x53,
|
|
0x2d,0x31,0x2e,0x32,0x37,0x00,0x11,0x22,
|
|
0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,
|
|
0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88,
|
|
0x99,0x00,0x11,0x22,0x33,0x44,0x55,0x66,
|
|
0x77,0x88,0x99,0x00,0x11,0x22,0x33,0x44,
|
|
0x55,0x66,0x77,0x88,0x99,0x00,0x11,0x22,
|
|
0x33,0x44,0x55,0x66,0x77,0x88,0x99,0x00,
|
|
0x11,0x22,0x33,0x5d,0x00,0x5b,0x00,0x77,
|
|
0x88,0x1e,0x00,0x00,0x57,0x00,0x00,0x00,
|
|
0x00,0x04,0x00,0x00,0x4f,0x00,0x00,0x00,
|
|
0x03,0x02,0x00,0x00,0x40,0x01,0x00,0x01,
|
|
0xce,0x02,0x68,0x2d,0x5f,0xa9,0xde,0x0c,
|
|
0xf6,0xd2,0x7b,0x58,0x4b,0xf9,0x28,0x68,
|
|
0x3d,0xb4,0xf4,0xef,0x78,0xd5,0xbe,0x66,
|
|
0x63,0x42,0xef,0xf8,0xfd,0xa4,0xf8,0xb0,
|
|
0x8e,0x29,0xc2,0xc9,0x2e,0xd8,0x45,0xb8,
|
|
0x53,0x8c,0x6f,0x4e,0x72,0x8f,0x6c,0x04,
|
|
0x9c,0x88,0xfc,0x1e,0xc5,0x83,0x55,0x57,
|
|
0xf7,0xdd,0xfd,0x4f,0x11,0x36,0x95,0x5d,
|
|
};
|
|
struct ap_queue_status status;
|
|
unsigned long long psmid;
|
|
char *reply;
|
|
int rc, i;
|
|
|
|
reply = (void *) get_zeroed_page(GFP_KERNEL);
|
|
if (!reply) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
status = __ap_send(ap_dev->qid, 0x0102030405060708ULL,
|
|
msg, sizeof(msg), 0);
|
|
if (status.response_code != AP_RESPONSE_NORMAL) {
|
|
rc = -ENODEV;
|
|
goto out_free;
|
|
}
|
|
|
|
/* Wait for the test message to complete. */
|
|
for (i = 0; i < 6; i++) {
|
|
mdelay(300);
|
|
status = __ap_recv(ap_dev->qid, &psmid, reply, 4096);
|
|
if (status.response_code == AP_RESPONSE_NORMAL &&
|
|
psmid == 0x0102030405060708ULL)
|
|
break;
|
|
}
|
|
if (i < 6) {
|
|
/* Got an answer. */
|
|
if (reply[0] == 0x00 && reply[1] == 0x86)
|
|
ap_dev->device_type = AP_DEVICE_TYPE_PCICC;
|
|
else
|
|
ap_dev->device_type = AP_DEVICE_TYPE_PCICA;
|
|
rc = 0;
|
|
} else
|
|
rc = -ENODEV;
|
|
|
|
out_free:
|
|
free_page((unsigned long) reply);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static void ap_interrupt_handler(void *unused1, void *unused2)
|
|
{
|
|
tasklet_schedule(&ap_tasklet);
|
|
}
|
|
|
|
/**
|
|
* __ap_scan_bus(): Scan the AP bus.
|
|
* @dev: Pointer to device
|
|
* @data: Pointer to data
|
|
*
|
|
* Scan the AP bus for new devices.
|
|
*/
|
|
static int __ap_scan_bus(struct device *dev, void *data)
|
|
{
|
|
return to_ap_dev(dev)->qid == (ap_qid_t)(unsigned long) data;
|
|
}
|
|
|
|
static void ap_device_release(struct device *dev)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
|
|
kfree(ap_dev);
|
|
}
|
|
|
|
static void ap_scan_bus(struct work_struct *unused)
|
|
{
|
|
struct ap_device *ap_dev;
|
|
struct device *dev;
|
|
ap_qid_t qid;
|
|
int queue_depth, device_type;
|
|
int rc, i;
|
|
|
|
if (ap_select_domain() != 0)
|
|
return;
|
|
for (i = 0; i < AP_DEVICES; i++) {
|
|
qid = AP_MKQID(i, ap_domain_index);
|
|
dev = bus_find_device(&ap_bus_type, NULL,
|
|
(void *)(unsigned long)qid,
|
|
__ap_scan_bus);
|
|
rc = ap_query_queue(qid, &queue_depth, &device_type);
|
|
if (dev) {
|
|
if (rc == -EBUSY) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
schedule_timeout(AP_RESET_TIMEOUT);
|
|
rc = ap_query_queue(qid, &queue_depth,
|
|
&device_type);
|
|
}
|
|
ap_dev = to_ap_dev(dev);
|
|
spin_lock_bh(&ap_dev->lock);
|
|
if (rc || ap_dev->unregistered) {
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
if (ap_dev->unregistered)
|
|
i--;
|
|
device_unregister(dev);
|
|
put_device(dev);
|
|
continue;
|
|
}
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
put_device(dev);
|
|
continue;
|
|
}
|
|
if (rc)
|
|
continue;
|
|
rc = ap_init_queue(qid);
|
|
if (rc)
|
|
continue;
|
|
ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL);
|
|
if (!ap_dev)
|
|
break;
|
|
ap_dev->qid = qid;
|
|
ap_dev->queue_depth = queue_depth;
|
|
ap_dev->unregistered = 1;
|
|
spin_lock_init(&ap_dev->lock);
|
|
INIT_LIST_HEAD(&ap_dev->pendingq);
|
|
INIT_LIST_HEAD(&ap_dev->requestq);
|
|
INIT_LIST_HEAD(&ap_dev->list);
|
|
setup_timer(&ap_dev->timeout, ap_request_timeout,
|
|
(unsigned long) ap_dev);
|
|
if (device_type == 0)
|
|
ap_probe_device_type(ap_dev);
|
|
else
|
|
ap_dev->device_type = device_type;
|
|
|
|
ap_dev->device.bus = &ap_bus_type;
|
|
ap_dev->device.parent = ap_root_device;
|
|
if (dev_set_name(&ap_dev->device, "card%02x",
|
|
AP_QID_DEVICE(ap_dev->qid))) {
|
|
kfree(ap_dev);
|
|
continue;
|
|
}
|
|
ap_dev->device.release = ap_device_release;
|
|
rc = device_register(&ap_dev->device);
|
|
if (rc) {
|
|
put_device(&ap_dev->device);
|
|
continue;
|
|
}
|
|
/* Add device attributes. */
|
|
rc = sysfs_create_group(&ap_dev->device.kobj,
|
|
&ap_dev_attr_group);
|
|
if (!rc) {
|
|
spin_lock_bh(&ap_dev->lock);
|
|
ap_dev->unregistered = 0;
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
}
|
|
else
|
|
device_unregister(&ap_dev->device);
|
|
}
|
|
}
|
|
|
|
static void
|
|
ap_config_timeout(unsigned long ptr)
|
|
{
|
|
queue_work(ap_work_queue, &ap_config_work);
|
|
ap_config_timer.expires = jiffies + ap_config_time * HZ;
|
|
add_timer(&ap_config_timer);
|
|
}
|
|
|
|
/**
|
|
* ap_schedule_poll_timer(): Schedule poll timer.
|
|
*
|
|
* Set up the timer to run the poll tasklet
|
|
*/
|
|
static inline void ap_schedule_poll_timer(void)
|
|
{
|
|
ktime_t hr_time;
|
|
|
|
spin_lock_bh(&ap_poll_timer_lock);
|
|
if (ap_using_interrupts() || ap_suspend_flag)
|
|
goto out;
|
|
if (hrtimer_is_queued(&ap_poll_timer))
|
|
goto out;
|
|
if (ktime_to_ns(hrtimer_expires_remaining(&ap_poll_timer)) <= 0) {
|
|
hr_time = ktime_set(0, poll_timeout);
|
|
hrtimer_forward_now(&ap_poll_timer, hr_time);
|
|
hrtimer_restart(&ap_poll_timer);
|
|
}
|
|
out:
|
|
spin_unlock_bh(&ap_poll_timer_lock);
|
|
}
|
|
|
|
/**
|
|
* ap_poll_read(): Receive pending reply messages from an AP device.
|
|
* @ap_dev: pointer to the AP device
|
|
* @flags: pointer to control flags, bit 2^0 is set if another poll is
|
|
* required, bit 2^1 is set if the poll timer needs to get armed
|
|
*
|
|
* Returns 0 if the device is still present, -ENODEV if not.
|
|
*/
|
|
static int ap_poll_read(struct ap_device *ap_dev, unsigned long *flags)
|
|
{
|
|
struct ap_queue_status status;
|
|
struct ap_message *ap_msg;
|
|
|
|
if (ap_dev->queue_count <= 0)
|
|
return 0;
|
|
status = __ap_recv(ap_dev->qid, &ap_dev->reply->psmid,
|
|
ap_dev->reply->message, ap_dev->reply->length);
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
atomic_dec(&ap_poll_requests);
|
|
ap_decrease_queue_count(ap_dev);
|
|
list_for_each_entry(ap_msg, &ap_dev->pendingq, list) {
|
|
if (ap_msg->psmid != ap_dev->reply->psmid)
|
|
continue;
|
|
list_del_init(&ap_msg->list);
|
|
ap_dev->pendingq_count--;
|
|
ap_dev->drv->receive(ap_dev, ap_msg, ap_dev->reply);
|
|
break;
|
|
}
|
|
if (ap_dev->queue_count > 0)
|
|
*flags |= 1;
|
|
break;
|
|
case AP_RESPONSE_NO_PENDING_REPLY:
|
|
if (status.queue_empty) {
|
|
/* The card shouldn't forget requests but who knows. */
|
|
atomic_sub(ap_dev->queue_count, &ap_poll_requests);
|
|
ap_dev->queue_count = 0;
|
|
list_splice_init(&ap_dev->pendingq, &ap_dev->requestq);
|
|
ap_dev->requestq_count += ap_dev->pendingq_count;
|
|
ap_dev->pendingq_count = 0;
|
|
} else
|
|
*flags |= 2;
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ap_poll_write(): Send messages from the request queue to an AP device.
|
|
* @ap_dev: pointer to the AP device
|
|
* @flags: pointer to control flags, bit 2^0 is set if another poll is
|
|
* required, bit 2^1 is set if the poll timer needs to get armed
|
|
*
|
|
* Returns 0 if the device is still present, -ENODEV if not.
|
|
*/
|
|
static int ap_poll_write(struct ap_device *ap_dev, unsigned long *flags)
|
|
{
|
|
struct ap_queue_status status;
|
|
struct ap_message *ap_msg;
|
|
|
|
if (ap_dev->requestq_count <= 0 ||
|
|
ap_dev->queue_count >= ap_dev->queue_depth)
|
|
return 0;
|
|
/* Start the next request on the queue. */
|
|
ap_msg = list_entry(ap_dev->requestq.next, struct ap_message, list);
|
|
status = __ap_send(ap_dev->qid, ap_msg->psmid,
|
|
ap_msg->message, ap_msg->length, ap_msg->special);
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
atomic_inc(&ap_poll_requests);
|
|
ap_increase_queue_count(ap_dev);
|
|
list_move_tail(&ap_msg->list, &ap_dev->pendingq);
|
|
ap_dev->requestq_count--;
|
|
ap_dev->pendingq_count++;
|
|
if (ap_dev->queue_count < ap_dev->queue_depth &&
|
|
ap_dev->requestq_count > 0)
|
|
*flags |= 1;
|
|
*flags |= 2;
|
|
break;
|
|
case AP_RESPONSE_Q_FULL:
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
*flags |= 2;
|
|
break;
|
|
case AP_RESPONSE_MESSAGE_TOO_BIG:
|
|
case AP_RESPONSE_REQ_FAC_NOT_INST:
|
|
return -EINVAL;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ap_poll_queue(): Poll AP device for pending replies and send new messages.
|
|
* @ap_dev: pointer to the bus device
|
|
* @flags: pointer to control flags, bit 2^0 is set if another poll is
|
|
* required, bit 2^1 is set if the poll timer needs to get armed
|
|
*
|
|
* Poll AP device for pending replies and send new messages. If either
|
|
* ap_poll_read or ap_poll_write returns -ENODEV unregister the device.
|
|
* Returns 0.
|
|
*/
|
|
static inline int ap_poll_queue(struct ap_device *ap_dev, unsigned long *flags)
|
|
{
|
|
int rc;
|
|
|
|
rc = ap_poll_read(ap_dev, flags);
|
|
if (rc)
|
|
return rc;
|
|
return ap_poll_write(ap_dev, flags);
|
|
}
|
|
|
|
/**
|
|
* __ap_queue_message(): Queue a message to a device.
|
|
* @ap_dev: pointer to the AP device
|
|
* @ap_msg: the message to be queued
|
|
*
|
|
* Queue a message to a device. Returns 0 if successful.
|
|
*/
|
|
static int __ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
|
|
{
|
|
struct ap_queue_status status;
|
|
|
|
if (list_empty(&ap_dev->requestq) &&
|
|
ap_dev->queue_count < ap_dev->queue_depth) {
|
|
status = __ap_send(ap_dev->qid, ap_msg->psmid,
|
|
ap_msg->message, ap_msg->length,
|
|
ap_msg->special);
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
list_add_tail(&ap_msg->list, &ap_dev->pendingq);
|
|
atomic_inc(&ap_poll_requests);
|
|
ap_dev->pendingq_count++;
|
|
ap_increase_queue_count(ap_dev);
|
|
ap_dev->total_request_count++;
|
|
break;
|
|
case AP_RESPONSE_Q_FULL:
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
list_add_tail(&ap_msg->list, &ap_dev->requestq);
|
|
ap_dev->requestq_count++;
|
|
ap_dev->total_request_count++;
|
|
return -EBUSY;
|
|
case AP_RESPONSE_REQ_FAC_NOT_INST:
|
|
case AP_RESPONSE_MESSAGE_TOO_BIG:
|
|
ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-EINVAL));
|
|
return -EINVAL;
|
|
default: /* Device is gone. */
|
|
ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
|
|
return -ENODEV;
|
|
}
|
|
} else {
|
|
list_add_tail(&ap_msg->list, &ap_dev->requestq);
|
|
ap_dev->requestq_count++;
|
|
ap_dev->total_request_count++;
|
|
return -EBUSY;
|
|
}
|
|
ap_schedule_poll_timer();
|
|
return 0;
|
|
}
|
|
|
|
void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
|
|
{
|
|
unsigned long flags;
|
|
int rc;
|
|
|
|
spin_lock_bh(&ap_dev->lock);
|
|
if (!ap_dev->unregistered) {
|
|
/* Make room on the queue by polling for finished requests. */
|
|
rc = ap_poll_queue(ap_dev, &flags);
|
|
if (!rc)
|
|
rc = __ap_queue_message(ap_dev, ap_msg);
|
|
if (!rc)
|
|
wake_up(&ap_poll_wait);
|
|
if (rc == -ENODEV)
|
|
ap_dev->unregistered = 1;
|
|
} else {
|
|
ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
|
|
rc = -ENODEV;
|
|
}
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
if (rc == -ENODEV)
|
|
device_unregister(&ap_dev->device);
|
|
}
|
|
EXPORT_SYMBOL(ap_queue_message);
|
|
|
|
/**
|
|
* ap_cancel_message(): Cancel a crypto request.
|
|
* @ap_dev: The AP device that has the message queued
|
|
* @ap_msg: The message that is to be removed
|
|
*
|
|
* Cancel a crypto request. This is done by removing the request
|
|
* from the device pending or request queue. Note that the
|
|
* request stays on the AP queue. When it finishes the message
|
|
* reply will be discarded because the psmid can't be found.
|
|
*/
|
|
void ap_cancel_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
|
|
{
|
|
struct ap_message *tmp;
|
|
|
|
spin_lock_bh(&ap_dev->lock);
|
|
if (!list_empty(&ap_msg->list)) {
|
|
list_for_each_entry(tmp, &ap_dev->pendingq, list)
|
|
if (tmp->psmid == ap_msg->psmid) {
|
|
ap_dev->pendingq_count--;
|
|
goto found;
|
|
}
|
|
ap_dev->requestq_count--;
|
|
found:
|
|
list_del_init(&ap_msg->list);
|
|
}
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
}
|
|
EXPORT_SYMBOL(ap_cancel_message);
|
|
|
|
/**
|
|
* ap_poll_timeout(): AP receive polling for finished AP requests.
|
|
* @unused: Unused pointer.
|
|
*
|
|
* Schedules the AP tasklet using a high resolution timer.
|
|
*/
|
|
static enum hrtimer_restart ap_poll_timeout(struct hrtimer *unused)
|
|
{
|
|
tasklet_schedule(&ap_tasklet);
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
/**
|
|
* ap_reset(): Reset a not responding AP device.
|
|
* @ap_dev: Pointer to the AP device
|
|
*
|
|
* Reset a not responding AP device and move all requests from the
|
|
* pending queue to the request queue.
|
|
*/
|
|
static void ap_reset(struct ap_device *ap_dev)
|
|
{
|
|
int rc;
|
|
|
|
ap_dev->reset = AP_RESET_IGNORE;
|
|
atomic_sub(ap_dev->queue_count, &ap_poll_requests);
|
|
ap_dev->queue_count = 0;
|
|
list_splice_init(&ap_dev->pendingq, &ap_dev->requestq);
|
|
ap_dev->requestq_count += ap_dev->pendingq_count;
|
|
ap_dev->pendingq_count = 0;
|
|
rc = ap_init_queue(ap_dev->qid);
|
|
if (rc == -ENODEV)
|
|
ap_dev->unregistered = 1;
|
|
}
|
|
|
|
static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags)
|
|
{
|
|
if (!ap_dev->unregistered) {
|
|
if (ap_poll_queue(ap_dev, flags))
|
|
ap_dev->unregistered = 1;
|
|
if (ap_dev->reset == AP_RESET_DO)
|
|
ap_reset(ap_dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ap_poll_all(): Poll all AP devices.
|
|
* @dummy: Unused variable
|
|
*
|
|
* Poll all AP devices on the bus in a round robin fashion. Continue
|
|
* polling until bit 2^0 of the control flags is not set. If bit 2^1
|
|
* of the control flags has been set arm the poll timer.
|
|
*/
|
|
static void ap_poll_all(unsigned long dummy)
|
|
{
|
|
unsigned long flags;
|
|
struct ap_device *ap_dev;
|
|
|
|
/* Reset the indicator if interrupts are used. Thus new interrupts can
|
|
* be received. Doing it in the beginning of the tasklet is therefor
|
|
* important that no requests on any AP get lost.
|
|
*/
|
|
if (ap_using_interrupts())
|
|
xchg((u8 *)ap_interrupt_indicator, 0);
|
|
do {
|
|
flags = 0;
|
|
spin_lock(&ap_device_list_lock);
|
|
list_for_each_entry(ap_dev, &ap_device_list, list) {
|
|
spin_lock(&ap_dev->lock);
|
|
__ap_poll_device(ap_dev, &flags);
|
|
spin_unlock(&ap_dev->lock);
|
|
}
|
|
spin_unlock(&ap_device_list_lock);
|
|
} while (flags & 1);
|
|
if (flags & 2)
|
|
ap_schedule_poll_timer();
|
|
}
|
|
|
|
/**
|
|
* ap_poll_thread(): Thread that polls for finished requests.
|
|
* @data: Unused pointer
|
|
*
|
|
* AP bus poll thread. The purpose of this thread is to poll for
|
|
* finished requests in a loop if there is a "free" cpu - that is
|
|
* a cpu that doesn't have anything better to do. The polling stops
|
|
* as soon as there is another task or if all messages have been
|
|
* delivered.
|
|
*/
|
|
static int ap_poll_thread(void *data)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
unsigned long flags;
|
|
int requests;
|
|
struct ap_device *ap_dev;
|
|
|
|
set_user_nice(current, 19);
|
|
while (1) {
|
|
if (ap_suspend_flag)
|
|
return 0;
|
|
if (need_resched()) {
|
|
schedule();
|
|
continue;
|
|
}
|
|
add_wait_queue(&ap_poll_wait, &wait);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (kthread_should_stop())
|
|
break;
|
|
requests = atomic_read(&ap_poll_requests);
|
|
if (requests <= 0)
|
|
schedule();
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&ap_poll_wait, &wait);
|
|
|
|
flags = 0;
|
|
spin_lock_bh(&ap_device_list_lock);
|
|
list_for_each_entry(ap_dev, &ap_device_list, list) {
|
|
spin_lock(&ap_dev->lock);
|
|
__ap_poll_device(ap_dev, &flags);
|
|
spin_unlock(&ap_dev->lock);
|
|
}
|
|
spin_unlock_bh(&ap_device_list_lock);
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&ap_poll_wait, &wait);
|
|
return 0;
|
|
}
|
|
|
|
static int ap_poll_thread_start(void)
|
|
{
|
|
int rc;
|
|
|
|
if (ap_using_interrupts() || ap_suspend_flag)
|
|
return 0;
|
|
mutex_lock(&ap_poll_thread_mutex);
|
|
if (!ap_poll_kthread) {
|
|
ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
|
|
rc = IS_ERR(ap_poll_kthread) ? PTR_ERR(ap_poll_kthread) : 0;
|
|
if (rc)
|
|
ap_poll_kthread = NULL;
|
|
}
|
|
else
|
|
rc = 0;
|
|
mutex_unlock(&ap_poll_thread_mutex);
|
|
return rc;
|
|
}
|
|
|
|
static void ap_poll_thread_stop(void)
|
|
{
|
|
mutex_lock(&ap_poll_thread_mutex);
|
|
if (ap_poll_kthread) {
|
|
kthread_stop(ap_poll_kthread);
|
|
ap_poll_kthread = NULL;
|
|
}
|
|
mutex_unlock(&ap_poll_thread_mutex);
|
|
}
|
|
|
|
/**
|
|
* ap_request_timeout(): Handling of request timeouts
|
|
* @data: Holds the AP device.
|
|
*
|
|
* Handles request timeouts.
|
|
*/
|
|
static void ap_request_timeout(unsigned long data)
|
|
{
|
|
struct ap_device *ap_dev = (struct ap_device *) data;
|
|
|
|
if (ap_dev->reset == AP_RESET_ARMED) {
|
|
ap_dev->reset = AP_RESET_DO;
|
|
|
|
if (ap_using_interrupts())
|
|
tasklet_schedule(&ap_tasklet);
|
|
}
|
|
}
|
|
|
|
static void ap_reset_domain(void)
|
|
{
|
|
int i;
|
|
|
|
if (ap_domain_index != -1)
|
|
for (i = 0; i < AP_DEVICES; i++)
|
|
ap_reset_queue(AP_MKQID(i, ap_domain_index));
|
|
}
|
|
|
|
static void ap_reset_all(void)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < AP_DOMAINS; i++)
|
|
for (j = 0; j < AP_DEVICES; j++)
|
|
ap_reset_queue(AP_MKQID(j, i));
|
|
}
|
|
|
|
static struct reset_call ap_reset_call = {
|
|
.fn = ap_reset_all,
|
|
};
|
|
|
|
/**
|
|
* ap_module_init(): The module initialization code.
|
|
*
|
|
* Initializes the module.
|
|
*/
|
|
int __init ap_module_init(void)
|
|
{
|
|
int rc, i;
|
|
|
|
if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) {
|
|
pr_warning("%d is not a valid cryptographic domain\n",
|
|
ap_domain_index);
|
|
return -EINVAL;
|
|
}
|
|
/* In resume callback we need to know if the user had set the domain.
|
|
* If so, we can not just reset it.
|
|
*/
|
|
if (ap_domain_index >= 0)
|
|
user_set_domain = 1;
|
|
|
|
if (ap_instructions_available() != 0) {
|
|
pr_warning("The hardware system does not support "
|
|
"AP instructions\n");
|
|
return -ENODEV;
|
|
}
|
|
if (ap_interrupts_available()) {
|
|
isc_register(AP_ISC);
|
|
ap_interrupt_indicator = s390_register_adapter_interrupt(
|
|
&ap_interrupt_handler, NULL, AP_ISC);
|
|
if (IS_ERR(ap_interrupt_indicator)) {
|
|
ap_interrupt_indicator = NULL;
|
|
isc_unregister(AP_ISC);
|
|
}
|
|
}
|
|
|
|
register_reset_call(&ap_reset_call);
|
|
|
|
/* Create /sys/bus/ap. */
|
|
rc = bus_register(&ap_bus_type);
|
|
if (rc)
|
|
goto out;
|
|
for (i = 0; ap_bus_attrs[i]; i++) {
|
|
rc = bus_create_file(&ap_bus_type, ap_bus_attrs[i]);
|
|
if (rc)
|
|
goto out_bus;
|
|
}
|
|
|
|
/* Create /sys/devices/ap. */
|
|
ap_root_device = root_device_register("ap");
|
|
rc = IS_ERR(ap_root_device) ? PTR_ERR(ap_root_device) : 0;
|
|
if (rc)
|
|
goto out_bus;
|
|
|
|
ap_work_queue = create_singlethread_workqueue("kapwork");
|
|
if (!ap_work_queue) {
|
|
rc = -ENOMEM;
|
|
goto out_root;
|
|
}
|
|
|
|
if (ap_select_domain() == 0)
|
|
ap_scan_bus(NULL);
|
|
|
|
/* Setup the AP bus rescan timer. */
|
|
init_timer(&ap_config_timer);
|
|
ap_config_timer.function = ap_config_timeout;
|
|
ap_config_timer.data = 0;
|
|
ap_config_timer.expires = jiffies + ap_config_time * HZ;
|
|
add_timer(&ap_config_timer);
|
|
|
|
/* Setup the high resultion poll timer.
|
|
* If we are running under z/VM adjust polling to z/VM polling rate.
|
|
*/
|
|
if (MACHINE_IS_VM)
|
|
poll_timeout = 1500000;
|
|
spin_lock_init(&ap_poll_timer_lock);
|
|
hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
|
|
ap_poll_timer.function = ap_poll_timeout;
|
|
|
|
/* Start the low priority AP bus poll thread. */
|
|
if (ap_thread_flag) {
|
|
rc = ap_poll_thread_start();
|
|
if (rc)
|
|
goto out_work;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_work:
|
|
del_timer_sync(&ap_config_timer);
|
|
hrtimer_cancel(&ap_poll_timer);
|
|
destroy_workqueue(ap_work_queue);
|
|
out_root:
|
|
root_device_unregister(ap_root_device);
|
|
out_bus:
|
|
while (i--)
|
|
bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
|
|
bus_unregister(&ap_bus_type);
|
|
out:
|
|
unregister_reset_call(&ap_reset_call);
|
|
if (ap_using_interrupts()) {
|
|
s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC);
|
|
isc_unregister(AP_ISC);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int __ap_match_all(struct device *dev, void *data)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* ap_modules_exit(): The module termination code
|
|
*
|
|
* Terminates the module.
|
|
*/
|
|
void ap_module_exit(void)
|
|
{
|
|
int i;
|
|
struct device *dev;
|
|
|
|
ap_reset_domain();
|
|
ap_poll_thread_stop();
|
|
del_timer_sync(&ap_config_timer);
|
|
hrtimer_cancel(&ap_poll_timer);
|
|
destroy_workqueue(ap_work_queue);
|
|
tasklet_kill(&ap_tasklet);
|
|
root_device_unregister(ap_root_device);
|
|
while ((dev = bus_find_device(&ap_bus_type, NULL, NULL,
|
|
__ap_match_all)))
|
|
{
|
|
device_unregister(dev);
|
|
put_device(dev);
|
|
}
|
|
for (i = 0; ap_bus_attrs[i]; i++)
|
|
bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
|
|
bus_unregister(&ap_bus_type);
|
|
unregister_reset_call(&ap_reset_call);
|
|
if (ap_using_interrupts()) {
|
|
s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC);
|
|
isc_unregister(AP_ISC);
|
|
}
|
|
}
|
|
|
|
#ifndef CONFIG_ZCRYPT_MONOLITHIC
|
|
module_init(ap_module_init);
|
|
module_exit(ap_module_exit);
|
|
#endif
|