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![Sascha Silbe](/assets/img/avatar_default.png)
On systems without AP bus (e.g. KVM) the kernel crashes during init calls when zcrypt is built-in: kernel BUG at drivers/base/driver.c:153! illegal operation: 0001 ilc:1 [#1] SMP Modules linked in: CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.2.0+ #221 task: 0000000010a40000 ti: 0000000010a48000 task.ti:0000000010a48000 Krnl PSW : 0704c00180000000 0000000000592bd6(driver_register+0x106/0x140) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 EA:3 0000000000000012 0000000000000000 0000000000c45328 0000000000c44e30 00000000009ef63c 000000000067f598 0000000000cf3c58 0000000000000000 000000000000007b 0000000000cb1030 0000000000000002 0000000000000000 0000000000ca8580 0000000010306700 00000000001001d8 0000000010a4bd88 Krnl Code: 0000000000592bc6: f0b00004ebcf srp 4(12,%r0),3023(%r14),0 0000000000592bcc: f0a0000407f4 srp 4(11,%r0),2036,0 #0000000000592bd2: a7f40001 brc 15,592bd4 >0000000000592bd6: e330d0000004 lg %r3,0(%r13) 0000000000592bdc: c0200021edfd larl %r2,9d07d6 0000000000592be2: c0e500126d8f brasl %r14,7e0700 0000000000592be8: e330d0080004 lg %r3,8(%r13) 0000000000592bee: a7f4ffab brc 15,592b44 Call Trace: ([<00000000001001c8>] do_one_initcall+0x90/0x1d0) [<0000000000c6dd34>] kernel_init_freeable+0x1e4/0x2a0 [<00000000007db53a>] kernel_init+0x2a/0x120 [<00000000007e8ece>] kernel_thread_starter+0x6/0xc [<00000000007e8ec8>] kernel_thread_starter+0x0/0xc Last Breaking-Event-Address: [<0000000000592bd2>] driver_register+0x102/0x140 When zcrypt is built as a module, the module loader ensures that the driver modules cannot be loaded if the AP bus module returns an error during initialisation. But if zcrypt and the driver are built-in, the driver is getting initialised even if the AP bus initialisation failed. The driver invokes ap_driver_register() during initialisation, which then causes operations on uninitialised data structures to be performed. Explicitly protect ap_driver_register() by introducing an "initialised" flag that gets set iff the AP bus initialisation was successful. When the AP bus initialisation failed, ap_driver_register() will error out with -ENODEV, causing the driver initialisation to fail as well. Test results: 1. Inside KVM (no AP bus), zcrypt built-in Boots. /sys/bus/ap not present (expected). 2. Inside KVM (no AP bus), zcrypt as module Boots. Loading zcrypt_cex4 fails because loading ap_bus fails (expected). 3. On LPAR with CEX5, zcrypt built-in Boots. /sys/bus/ap/devices/card* present but .../card*/type missing (i.e. zcrypt_device_register() fails, unrelated issue). 4. On LPAR with CEX5, zcrypt as module Boots. Loading zcrypt_cex4 successful, /sys/bus/ap/devices/card*/type present. No further testing (user-space functionality) was done. Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
1864 lines
48 KiB
C
1864 lines
48 KiB
C
/*
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* Copyright IBM Corp. 2006, 2012
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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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* Holger Dengler <hd@linux.vnet.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/kernel_stat.h>
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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 <linux/suspend.h>
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#include <asm/reset.h>
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#include <asm/airq.h>
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#include <linux/atomic.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 <asm/facility.h>
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#include <linux/crypto.h>
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#include "ap_bus.h"
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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 IBM Corp. 2006, 2012");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_CRYPTO("z90crypt");
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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, S_IRUSR|S_IRGRP);
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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, S_IRUSR|S_IRGRP);
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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 struct ap_config_info *ap_configuration;
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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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static bool initialised;
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/*
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* Workqueue timer for bus rescan.
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*/
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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 void ap_scan_bus(struct work_struct *);
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static DECLARE_WORK(ap_scan_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 void ap_tasklet_fn(unsigned long);
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static DECLARE_TASKLET(ap_tasklet, ap_tasklet_fn, 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 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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/* Maximum domain id */
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static int ap_max_domain_id;
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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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/* Adapter interrupt definitions */
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static void ap_interrupt_handler(struct airq_struct *airq);
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static int ap_airq_flag;
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static struct airq_struct ap_airq = {
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.handler = ap_interrupt_handler,
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.isc = AP_ISC,
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};
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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_airq_flag;
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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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return test_facility(65);
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}
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/**
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* ap_configuration_available(): Test if AP configuration
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* information is available.
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*
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* Returns 1 if AP configuration information is available.
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*/
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static int ap_configuration_available(void)
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{
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return test_facility(12);
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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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* @info: Pointer to queue descriptor
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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, unsigned long *info)
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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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if (test_facility(15))
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reg0 |= 1UL << 23; /* set APFT T bit*/
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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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if (info)
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*info = reg2;
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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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/**
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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(AQIC) */
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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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/**
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* ap_query_configuration(): Get AP configuration data
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*
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* Returns 0 on success, or -EOPNOTSUPP.
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*/
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static inline int ap_query_configuration(void)
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{
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register unsigned long reg0 asm ("0") = 0x04000000UL;
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register unsigned long reg1 asm ("1") = -EINVAL;
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register void *reg2 asm ("2") = (void *) ap_configuration;
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if (!ap_configuration)
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return -EOPNOTSUPP;
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asm volatile(
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".long 0xb2af0000\n" /* PQAP(QCI) */
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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)
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:
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: "cc");
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return reg1;
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}
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/**
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* ap_init_configuration(): Allocate and query configuration array.
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*/
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static void ap_init_configuration(void)
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{
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if (!ap_configuration_available())
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return;
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ap_configuration = kzalloc(sizeof(*ap_configuration), GFP_KERNEL);
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if (!ap_configuration)
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return;
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if (ap_query_configuration() != 0) {
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kfree(ap_configuration);
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ap_configuration = NULL;
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return;
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}
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}
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/*
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* ap_test_config(): helper function to extract the nrth bit
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* within the unsigned int array field.
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*/
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static inline int ap_test_config(unsigned int *field, unsigned int nr)
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{
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return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
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}
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/*
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* ap_test_config_card_id(): Test, whether an AP card ID is configured.
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* @id AP card ID
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*
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* Returns 0 if the card is not configured
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* 1 if the card is configured or
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* if the configuration information is not available
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*/
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static inline int ap_test_config_card_id(unsigned int id)
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{
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if (!ap_configuration) /* QCI not supported */
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return 1;
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return ap_test_config(ap_configuration->apm, id);
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}
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/*
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* ap_test_config_domain(): Test, whether an AP usage domain is configured.
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* @domain AP usage domain ID
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*
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* Returns 0 if the usage domain is not configured
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* 1 if the usage domain is configured or
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* if the configuration information is not available
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*/
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static inline int ap_test_config_domain(unsigned int domain)
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{
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if (!ap_configuration) /* QCI not supported */
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return domain < 16;
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return ap_test_config(ap_configuration->aqm, domain);
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}
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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(struct ap_device *ap_dev, void *ind)
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{
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struct ap_queue_status status;
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status = ap_queue_interruption_control(ap_dev->qid, ind);
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switch (status.response_code) {
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case AP_RESPONSE_NORMAL:
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case AP_RESPONSE_OTHERWISE_CHANGED:
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return 0;
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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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pr_err("Registering adapter interrupts for AP %d failed\n",
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AP_QID_DEVICE(ap_dev->qid));
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return -EOPNOTSUPP;
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case AP_RESPONSE_RESET_IN_PROGRESS:
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case AP_RESPONSE_BUSY:
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default:
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return -EBUSY;
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}
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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") = psmid & 0xffffffff;
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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" /* NQAP */
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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(
|
|
"0: .long 0xb2ae0064\n" /* DQAP */
|
|
" brc 6,0b\n"
|
|
: "+d" (reg0), "=d" (reg1), "+d" (reg2),
|
|
"+d" (reg4), "+d" (reg5), "+d" (reg6), "+d" (reg7),
|
|
"=m" (*(msgblock *) msg) : : "cc" );
|
|
*psmid = (((unsigned long long) reg6) << 32) + reg7;
|
|
return reg1;
|
|
}
|
|
|
|
int ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
|
|
{
|
|
struct ap_queue_status status;
|
|
|
|
status = __ap_recv(qid, psmid, msg, length);
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
return 0;
|
|
case AP_RESPONSE_NO_PENDING_REPLY:
|
|
if (status.queue_empty)
|
|
return -ENOENT;
|
|
return -EBUSY;
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
return -EBUSY;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(ap_recv);
|
|
|
|
/**
|
|
* ap_query_queue(): Check if an AP queue is available.
|
|
* @qid: The AP queue number
|
|
* @queue_depth: Pointer to queue depth value
|
|
* @device_type: Pointer to device type value
|
|
* @facilities: Pointer to facility indicator
|
|
*/
|
|
static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type,
|
|
unsigned int *facilities)
|
|
{
|
|
struct ap_queue_status status;
|
|
unsigned long info;
|
|
int nd;
|
|
|
|
if (!ap_test_config_card_id(AP_QID_DEVICE(qid)))
|
|
return -ENODEV;
|
|
|
|
status = ap_test_queue(qid, &info);
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
*queue_depth = (int)(info & 0xff);
|
|
*device_type = (int)((info >> 24) & 0xff);
|
|
*facilities = (unsigned int)(info >> 32);
|
|
/* Update maximum domain id */
|
|
nd = (info >> 16) & 0xff;
|
|
if ((info & (1UL << 57)) && nd > 0)
|
|
ap_max_domain_id = nd;
|
|
return 0;
|
|
case AP_RESPONSE_Q_NOT_AVAIL:
|
|
case AP_RESPONSE_DECONFIGURED:
|
|
case AP_RESPONSE_CHECKSTOPPED:
|
|
case AP_RESPONSE_INVALID_ADDRESS:
|
|
return -ENODEV;
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
case AP_RESPONSE_OTHERWISE_CHANGED:
|
|
case AP_RESPONSE_BUSY:
|
|
return -EBUSY;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
/* State machine definitions and helpers */
|
|
|
|
static void ap_sm_wait(enum ap_wait wait)
|
|
{
|
|
ktime_t hr_time;
|
|
|
|
switch (wait) {
|
|
case AP_WAIT_AGAIN:
|
|
case AP_WAIT_INTERRUPT:
|
|
if (ap_using_interrupts())
|
|
break;
|
|
if (ap_poll_kthread) {
|
|
wake_up(&ap_poll_wait);
|
|
break;
|
|
}
|
|
/* Fall through */
|
|
case AP_WAIT_TIMEOUT:
|
|
spin_lock_bh(&ap_poll_timer_lock);
|
|
if (!hrtimer_is_queued(&ap_poll_timer)) {
|
|
hr_time = ktime_set(0, poll_timeout);
|
|
hrtimer_forward_now(&ap_poll_timer, hr_time);
|
|
hrtimer_restart(&ap_poll_timer);
|
|
}
|
|
spin_unlock_bh(&ap_poll_timer_lock);
|
|
break;
|
|
case AP_WAIT_NONE:
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static enum ap_wait ap_sm_nop(struct ap_device *ap_dev)
|
|
{
|
|
return AP_WAIT_NONE;
|
|
}
|
|
|
|
/**
|
|
* ap_sm_recv(): Receive pending reply messages from an AP device but do
|
|
* not change the state of the device.
|
|
* @ap_dev: pointer to the AP device
|
|
*
|
|
* Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
|
|
*/
|
|
static struct ap_queue_status ap_sm_recv(struct ap_device *ap_dev)
|
|
{
|
|
struct ap_queue_status status;
|
|
struct ap_message *ap_msg;
|
|
|
|
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_dev->queue_count--;
|
|
if (ap_dev->queue_count > 0)
|
|
mod_timer(&ap_dev->timeout,
|
|
jiffies + ap_dev->drv->request_timeout);
|
|
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_msg->receive(ap_dev, ap_msg, ap_dev->reply);
|
|
break;
|
|
}
|
|
case AP_RESPONSE_NO_PENDING_REPLY:
|
|
if (!status.queue_empty || ap_dev->queue_count <= 0)
|
|
break;
|
|
/* 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;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* ap_sm_read(): Receive pending reply messages from an AP device.
|
|
* @ap_dev: pointer to the AP device
|
|
*
|
|
* Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
|
|
*/
|
|
static enum ap_wait ap_sm_read(struct ap_device *ap_dev)
|
|
{
|
|
struct ap_queue_status status;
|
|
|
|
status = ap_sm_recv(ap_dev);
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
if (ap_dev->queue_count > 0)
|
|
return AP_WAIT_AGAIN;
|
|
ap_dev->state = AP_STATE_IDLE;
|
|
return AP_WAIT_NONE;
|
|
case AP_RESPONSE_NO_PENDING_REPLY:
|
|
if (ap_dev->queue_count > 0)
|
|
return AP_WAIT_INTERRUPT;
|
|
ap_dev->state = AP_STATE_IDLE;
|
|
return AP_WAIT_NONE;
|
|
default:
|
|
ap_dev->state = AP_STATE_BORKED;
|
|
return AP_WAIT_NONE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ap_sm_write(): Send messages from the request queue to an AP device.
|
|
* @ap_dev: pointer to the AP device
|
|
*
|
|
* Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
|
|
*/
|
|
static enum ap_wait ap_sm_write(struct ap_device *ap_dev)
|
|
{
|
|
struct ap_queue_status status;
|
|
struct ap_message *ap_msg;
|
|
|
|
if (ap_dev->requestq_count <= 0)
|
|
return AP_WAIT_NONE;
|
|
/* 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_dev->queue_count++;
|
|
if (ap_dev->queue_count == 1)
|
|
mod_timer(&ap_dev->timeout,
|
|
jiffies + ap_dev->drv->request_timeout);
|
|
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->state = AP_STATE_WORKING;
|
|
return AP_WAIT_AGAIN;
|
|
}
|
|
/* fall through */
|
|
case AP_RESPONSE_Q_FULL:
|
|
ap_dev->state = AP_STATE_QUEUE_FULL;
|
|
return AP_WAIT_INTERRUPT;
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
ap_dev->state = AP_STATE_RESET_WAIT;
|
|
return AP_WAIT_TIMEOUT;
|
|
case AP_RESPONSE_MESSAGE_TOO_BIG:
|
|
case AP_RESPONSE_REQ_FAC_NOT_INST:
|
|
list_del_init(&ap_msg->list);
|
|
ap_dev->requestq_count--;
|
|
ap_msg->rc = -EINVAL;
|
|
ap_msg->receive(ap_dev, ap_msg, NULL);
|
|
return AP_WAIT_AGAIN;
|
|
default:
|
|
ap_dev->state = AP_STATE_BORKED;
|
|
return AP_WAIT_NONE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ap_sm_read_write(): Send and receive messages to/from an AP device.
|
|
* @ap_dev: pointer to the AP device
|
|
*
|
|
* Returns AP_WAIT_NONE, AP_WAIT_AGAIN, or AP_WAIT_INTERRUPT
|
|
*/
|
|
static enum ap_wait ap_sm_read_write(struct ap_device *ap_dev)
|
|
{
|
|
return min(ap_sm_read(ap_dev), ap_sm_write(ap_dev));
|
|
}
|
|
|
|
/**
|
|
* ap_sm_reset(): Reset an AP queue.
|
|
* @qid: The AP queue number
|
|
*
|
|
* Submit the Reset command to an AP queue.
|
|
*/
|
|
static enum ap_wait ap_sm_reset(struct ap_device *ap_dev)
|
|
{
|
|
struct ap_queue_status status;
|
|
|
|
status = ap_reset_queue(ap_dev->qid);
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
ap_dev->state = AP_STATE_RESET_WAIT;
|
|
ap_dev->interrupt = AP_INTR_DISABLED;
|
|
return AP_WAIT_TIMEOUT;
|
|
case AP_RESPONSE_BUSY:
|
|
return AP_WAIT_TIMEOUT;
|
|
case AP_RESPONSE_Q_NOT_AVAIL:
|
|
case AP_RESPONSE_DECONFIGURED:
|
|
case AP_RESPONSE_CHECKSTOPPED:
|
|
default:
|
|
ap_dev->state = AP_STATE_BORKED;
|
|
return AP_WAIT_NONE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ap_sm_reset_wait(): Test queue for completion of the reset operation
|
|
* @ap_dev: pointer to the AP device
|
|
*
|
|
* Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
|
|
*/
|
|
static enum ap_wait ap_sm_reset_wait(struct ap_device *ap_dev)
|
|
{
|
|
struct ap_queue_status status;
|
|
unsigned long info;
|
|
|
|
if (ap_dev->queue_count > 0)
|
|
/* Try to read a completed message and get the status */
|
|
status = ap_sm_recv(ap_dev);
|
|
else
|
|
/* Get the status with TAPQ */
|
|
status = ap_test_queue(ap_dev->qid, &info);
|
|
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
if (ap_using_interrupts() &&
|
|
ap_queue_enable_interruption(ap_dev,
|
|
ap_airq.lsi_ptr) == 0)
|
|
ap_dev->state = AP_STATE_SETIRQ_WAIT;
|
|
else
|
|
ap_dev->state = (ap_dev->queue_count > 0) ?
|
|
AP_STATE_WORKING : AP_STATE_IDLE;
|
|
return AP_WAIT_AGAIN;
|
|
case AP_RESPONSE_BUSY:
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
return AP_WAIT_TIMEOUT;
|
|
case AP_RESPONSE_Q_NOT_AVAIL:
|
|
case AP_RESPONSE_DECONFIGURED:
|
|
case AP_RESPONSE_CHECKSTOPPED:
|
|
default:
|
|
ap_dev->state = AP_STATE_BORKED;
|
|
return AP_WAIT_NONE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ap_sm_setirq_wait(): Test queue for completion of the irq enablement
|
|
* @ap_dev: pointer to the AP device
|
|
*
|
|
* Returns AP_POLL_IMMEDIATELY, AP_POLL_AFTER_TIMEROUT or 0.
|
|
*/
|
|
static enum ap_wait ap_sm_setirq_wait(struct ap_device *ap_dev)
|
|
{
|
|
struct ap_queue_status status;
|
|
unsigned long info;
|
|
|
|
if (ap_dev->queue_count > 0)
|
|
/* Try to read a completed message and get the status */
|
|
status = ap_sm_recv(ap_dev);
|
|
else
|
|
/* Get the status with TAPQ */
|
|
status = ap_test_queue(ap_dev->qid, &info);
|
|
|
|
if (status.int_enabled == 1) {
|
|
/* Irqs are now enabled */
|
|
ap_dev->interrupt = AP_INTR_ENABLED;
|
|
ap_dev->state = (ap_dev->queue_count > 0) ?
|
|
AP_STATE_WORKING : AP_STATE_IDLE;
|
|
}
|
|
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
if (ap_dev->queue_count > 0)
|
|
return AP_WAIT_AGAIN;
|
|
/* fallthrough */
|
|
case AP_RESPONSE_NO_PENDING_REPLY:
|
|
return AP_WAIT_TIMEOUT;
|
|
default:
|
|
ap_dev->state = AP_STATE_BORKED;
|
|
return AP_WAIT_NONE;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* AP state machine jump table
|
|
*/
|
|
ap_func_t *ap_jumptable[NR_AP_STATES][NR_AP_EVENTS] = {
|
|
[AP_STATE_RESET_START] = {
|
|
[AP_EVENT_POLL] = ap_sm_reset,
|
|
[AP_EVENT_TIMEOUT] = ap_sm_nop,
|
|
},
|
|
[AP_STATE_RESET_WAIT] = {
|
|
[AP_EVENT_POLL] = ap_sm_reset_wait,
|
|
[AP_EVENT_TIMEOUT] = ap_sm_nop,
|
|
},
|
|
[AP_STATE_SETIRQ_WAIT] = {
|
|
[AP_EVENT_POLL] = ap_sm_setirq_wait,
|
|
[AP_EVENT_TIMEOUT] = ap_sm_nop,
|
|
},
|
|
[AP_STATE_IDLE] = {
|
|
[AP_EVENT_POLL] = ap_sm_write,
|
|
[AP_EVENT_TIMEOUT] = ap_sm_nop,
|
|
},
|
|
[AP_STATE_WORKING] = {
|
|
[AP_EVENT_POLL] = ap_sm_read_write,
|
|
[AP_EVENT_TIMEOUT] = ap_sm_reset,
|
|
},
|
|
[AP_STATE_QUEUE_FULL] = {
|
|
[AP_EVENT_POLL] = ap_sm_read,
|
|
[AP_EVENT_TIMEOUT] = ap_sm_reset,
|
|
},
|
|
[AP_STATE_SUSPEND_WAIT] = {
|
|
[AP_EVENT_POLL] = ap_sm_read,
|
|
[AP_EVENT_TIMEOUT] = ap_sm_nop,
|
|
},
|
|
[AP_STATE_BORKED] = {
|
|
[AP_EVENT_POLL] = ap_sm_nop,
|
|
[AP_EVENT_TIMEOUT] = ap_sm_nop,
|
|
},
|
|
};
|
|
|
|
static inline enum ap_wait ap_sm_event(struct ap_device *ap_dev,
|
|
enum ap_event event)
|
|
{
|
|
return ap_jumptable[ap_dev->state][event](ap_dev);
|
|
}
|
|
|
|
static inline enum ap_wait ap_sm_event_loop(struct ap_device *ap_dev,
|
|
enum ap_event event)
|
|
{
|
|
enum ap_wait wait;
|
|
|
|
while ((wait = ap_sm_event(ap_dev, event)) == AP_WAIT_AGAIN)
|
|
;
|
|
return wait;
|
|
}
|
|
|
|
/**
|
|
* 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_suspend_flag)
|
|
return;
|
|
spin_lock_bh(&ap_dev->lock);
|
|
ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_TIMEOUT));
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
if (!ap_suspend_flag)
|
|
tasklet_schedule(&ap_tasklet);
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
/**
|
|
* ap_interrupt_handler() - Schedule ap_tasklet on interrupt
|
|
* @airq: pointer to adapter interrupt descriptor
|
|
*/
|
|
static void ap_interrupt_handler(struct airq_struct *airq)
|
|
{
|
|
inc_irq_stat(IRQIO_APB);
|
|
if (!ap_suspend_flag)
|
|
tasklet_schedule(&ap_tasklet);
|
|
}
|
|
|
|
/**
|
|
* ap_tasklet_fn(): Tasklet to poll all AP devices.
|
|
* @dummy: Unused variable
|
|
*
|
|
* Poll all AP devices on the bus.
|
|
*/
|
|
static void ap_tasklet_fn(unsigned long dummy)
|
|
{
|
|
struct ap_device *ap_dev;
|
|
enum ap_wait wait = AP_WAIT_NONE;
|
|
|
|
/* 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(ap_airq.lsi_ptr, 0);
|
|
|
|
spin_lock(&ap_device_list_lock);
|
|
list_for_each_entry(ap_dev, &ap_device_list, list) {
|
|
spin_lock_bh(&ap_dev->lock);
|
|
wait = min(wait, ap_sm_event_loop(ap_dev, AP_EVENT_POLL));
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
}
|
|
spin_unlock(&ap_device_list_lock);
|
|
ap_sm_wait(wait);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
|
|
set_user_nice(current, MAX_NICE);
|
|
set_freezable();
|
|
while (!kthread_should_stop()) {
|
|
add_wait_queue(&ap_poll_wait, &wait);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
if (ap_suspend_flag ||
|
|
atomic_read(&ap_poll_requests) <= 0) {
|
|
schedule();
|
|
try_to_freeze();
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&ap_poll_wait, &wait);
|
|
if (need_resched()) {
|
|
schedule();
|
|
try_to_freeze();
|
|
continue;
|
|
}
|
|
ap_tasklet_fn(0);
|
|
} while (!kthread_should_stop());
|
|
return 0;
|
|
}
|
|
|
|
static int ap_poll_thread_start(void)
|
|
{
|
|
int rc;
|
|
|
|
if (ap_using_interrupts() || ap_poll_kthread)
|
|
return 0;
|
|
mutex_lock(&ap_poll_thread_mutex);
|
|
ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
|
|
rc = PTR_RET(ap_poll_kthread);
|
|
if (rc)
|
|
ap_poll_kthread = NULL;
|
|
mutex_unlock(&ap_poll_thread_mutex);
|
|
return rc;
|
|
}
|
|
|
|
static void ap_poll_thread_stop(void)
|
|
{
|
|
if (!ap_poll_kthread)
|
|
return;
|
|
mutex_lock(&ap_poll_thread_mutex);
|
|
kthread_stop(ap_poll_kthread);
|
|
ap_poll_kthread = NULL;
|
|
mutex_unlock(&ap_poll_thread_mutex);
|
|
}
|
|
|
|
/**
|
|
* ap_queue_message(): Queue a request to an AP device.
|
|
* @ap_dev: The AP device to queue the message to
|
|
* @ap_msg: The message that is to be added
|
|
*/
|
|
void ap_queue_message(struct ap_device *ap_dev, struct ap_message *ap_msg)
|
|
{
|
|
/* For asynchronous message handling a valid receive-callback
|
|
* is required. */
|
|
BUG_ON(!ap_msg->receive);
|
|
|
|
spin_lock_bh(&ap_dev->lock);
|
|
/* Queue the message. */
|
|
list_add_tail(&ap_msg->list, &ap_dev->requestq);
|
|
ap_dev->requestq_count++;
|
|
ap_dev->total_request_count++;
|
|
/* Send/receive as many request from the queue as possible. */
|
|
ap_sm_wait(ap_sm_event_loop(ap_dev, AP_EVENT_POLL));
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
}
|
|
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 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_raw_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->raw_hwtype);
|
|
}
|
|
|
|
static DEVICE_ATTR(raw_hwtype, 0444, ap_raw_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_requestq_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->requestq_count);
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
return rc;
|
|
}
|
|
|
|
static DEVICE_ATTR(requestq_count, 0444, ap_requestq_count_show, NULL);
|
|
|
|
static ssize_t ap_pendingq_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->pendingq_count);
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
return rc;
|
|
}
|
|
|
|
static DEVICE_ATTR(pendingq_count, 0444, ap_pendingq_count_show, NULL);
|
|
|
|
static ssize_t ap_reset_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
int rc = 0;
|
|
|
|
spin_lock_bh(&ap_dev->lock);
|
|
switch (ap_dev->state) {
|
|
case AP_STATE_RESET_START:
|
|
case AP_STATE_RESET_WAIT:
|
|
rc = snprintf(buf, PAGE_SIZE, "Reset in progress.\n");
|
|
break;
|
|
case AP_STATE_WORKING:
|
|
case AP_STATE_QUEUE_FULL:
|
|
rc = snprintf(buf, PAGE_SIZE, "Reset Timer armed.\n");
|
|
break;
|
|
default:
|
|
rc = snprintf(buf, PAGE_SIZE, "No Reset Timer set.\n");
|
|
}
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
return rc;
|
|
}
|
|
|
|
static DEVICE_ATTR(reset, 0444, ap_reset_show, NULL);
|
|
|
|
static ssize_t ap_interrupt_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
int rc = 0;
|
|
|
|
spin_lock_bh(&ap_dev->lock);
|
|
if (ap_dev->state == AP_STATE_SETIRQ_WAIT)
|
|
rc = snprintf(buf, PAGE_SIZE, "Enable Interrupt pending.\n");
|
|
else if (ap_dev->interrupt == AP_INTR_ENABLED)
|
|
rc = snprintf(buf, PAGE_SIZE, "Interrupts enabled.\n");
|
|
else
|
|
rc = snprintf(buf, PAGE_SIZE, "Interrupts disabled.\n");
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
return rc;
|
|
}
|
|
|
|
static DEVICE_ATTR(interrupt, 0444, ap_interrupt_show, NULL);
|
|
|
|
static ssize_t ap_modalias_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "ap:t%02X\n", to_ap_dev(dev)->device_type);
|
|
}
|
|
|
|
static DEVICE_ATTR(modalias, 0444, ap_modalias_show, NULL);
|
|
|
|
static ssize_t ap_functions_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
return snprintf(buf, PAGE_SIZE, "0x%08X\n", ap_dev->functions);
|
|
}
|
|
|
|
static DEVICE_ATTR(ap_functions, 0444, ap_functions_show, NULL);
|
|
|
|
static struct attribute *ap_dev_attrs[] = {
|
|
&dev_attr_hwtype.attr,
|
|
&dev_attr_raw_hwtype.attr,
|
|
&dev_attr_depth.attr,
|
|
&dev_attr_request_count.attr,
|
|
&dev_attr_requestq_count.attr,
|
|
&dev_attr_pendingq_count.attr,
|
|
&dev_attr_reset.attr,
|
|
&dev_attr_interrupt.attr,
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_ap_functions.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_dev_suspend(struct device *dev, pm_message_t state)
|
|
{
|
|
struct ap_device *ap_dev = to_ap_dev(dev);
|
|
|
|
/* Poll on the device until all requests are finished. */
|
|
spin_lock_bh(&ap_dev->lock);
|
|
ap_dev->state = AP_STATE_SUSPEND_WAIT;
|
|
while (ap_sm_event(ap_dev, AP_EVENT_POLL) != AP_WAIT_NONE)
|
|
;
|
|
ap_dev->state = AP_STATE_BORKED;
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int ap_dev_resume(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void ap_bus_suspend(void)
|
|
{
|
|
ap_suspend_flag = 1;
|
|
/*
|
|
* Disable scanning for devices, thus we do not want to scan
|
|
* for them after removing.
|
|
*/
|
|
flush_work(&ap_scan_work);
|
|
tasklet_disable(&ap_tasklet);
|
|
}
|
|
|
|
static int __ap_devices_unregister(struct device *dev, void *dummy)
|
|
{
|
|
device_unregister(dev);
|
|
return 0;
|
|
}
|
|
|
|
static void ap_bus_resume(void)
|
|
{
|
|
int rc;
|
|
|
|
/* Unconditionally remove all AP devices */
|
|
bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister);
|
|
/* Reset thin interrupt setting */
|
|
if (ap_interrupts_available() && !ap_using_interrupts()) {
|
|
rc = register_adapter_interrupt(&ap_airq);
|
|
ap_airq_flag = (rc == 0);
|
|
}
|
|
if (!ap_interrupts_available() && ap_using_interrupts()) {
|
|
unregister_adapter_interrupt(&ap_airq);
|
|
ap_airq_flag = 0;
|
|
}
|
|
/* Reset domain */
|
|
if (!user_set_domain)
|
|
ap_domain_index = -1;
|
|
/* Get things going again */
|
|
ap_suspend_flag = 0;
|
|
if (ap_airq_flag)
|
|
xchg(ap_airq.lsi_ptr, 0);
|
|
tasklet_enable(&ap_tasklet);
|
|
queue_work(system_long_wq, &ap_scan_work);
|
|
}
|
|
|
|
static int ap_power_event(struct notifier_block *this, unsigned long event,
|
|
void *ptr)
|
|
{
|
|
switch (event) {
|
|
case PM_HIBERNATION_PREPARE:
|
|
case PM_SUSPEND_PREPARE:
|
|
ap_bus_suspend();
|
|
break;
|
|
case PM_POST_HIBERNATION:
|
|
case PM_POST_SUSPEND:
|
|
ap_bus_resume();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
static struct notifier_block ap_power_notifier = {
|
|
.notifier_call = ap_power_event,
|
|
};
|
|
|
|
static struct bus_type ap_bus_type = {
|
|
.name = "ap",
|
|
.match = &ap_bus_match,
|
|
.uevent = &ap_uevent,
|
|
.suspend = ap_dev_suspend,
|
|
.resume = ap_dev_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)
|
|
ap_dev->drv = NULL;
|
|
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_msg->rc = -EAGAIN;
|
|
ap_msg->receive(ap_dev, ap_msg, NULL);
|
|
}
|
|
list_for_each_entry_safe(ap_msg, next, &ap_dev->requestq, list) {
|
|
list_del_init(&ap_msg->list);
|
|
ap_dev->requestq_count--;
|
|
ap_msg->rc = -EAGAIN;
|
|
ap_msg->receive(ap_dev, ap_msg, NULL);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static void ap_device_release(struct device *dev)
|
|
{
|
|
kfree(to_ap_dev(dev));
|
|
}
|
|
|
|
int ap_driver_register(struct ap_driver *ap_drv, struct module *owner,
|
|
char *name)
|
|
{
|
|
struct device_driver *drv = &ap_drv->driver;
|
|
|
|
if (!initialised)
|
|
return -ENODEV;
|
|
|
|
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);
|
|
|
|
void ap_bus_force_rescan(void)
|
|
{
|
|
if (ap_suspend_flag)
|
|
return;
|
|
/* processing a asynchronous bus rescan */
|
|
del_timer(&ap_config_timer);
|
|
queue_work(system_long_wq, &ap_scan_work);
|
|
flush_work(&ap_scan_work);
|
|
}
|
|
EXPORT_SYMBOL(ap_bus_force_rescan);
|
|
|
|
/*
|
|
* 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_control_domain_mask_show(struct bus_type *bus, char *buf)
|
|
{
|
|
if (!ap_configuration) /* QCI not supported */
|
|
return snprintf(buf, PAGE_SIZE, "not supported\n");
|
|
if (!test_facility(76))
|
|
/* format 0 - 16 bit domain field */
|
|
return snprintf(buf, PAGE_SIZE, "%08x%08x\n",
|
|
ap_configuration->adm[0],
|
|
ap_configuration->adm[1]);
|
|
/* format 1 - 256 bit domain field */
|
|
return snprintf(buf, PAGE_SIZE,
|
|
"0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
|
|
ap_configuration->adm[0], ap_configuration->adm[1],
|
|
ap_configuration->adm[2], ap_configuration->adm[3],
|
|
ap_configuration->adm[4], ap_configuration->adm[5],
|
|
ap_configuration->adm[6], ap_configuration->adm[7]);
|
|
}
|
|
|
|
static BUS_ATTR(ap_control_domain_mask, 0444,
|
|
ap_control_domain_mask_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;
|
|
mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
|
|
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)
|
|
count = 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);
|
|
|
|
spin_lock_bh(&ap_poll_timer_lock);
|
|
hrtimer_cancel(&ap_poll_timer);
|
|
hrtimer_set_expires(&ap_poll_timer, hr_time);
|
|
hrtimer_start_expires(&ap_poll_timer, HRTIMER_MODE_ABS);
|
|
spin_unlock_bh(&ap_poll_timer_lock);
|
|
|
|
return count;
|
|
}
|
|
|
|
static BUS_ATTR(poll_timeout, 0644, poll_timeout_show, poll_timeout_store);
|
|
|
|
static ssize_t ap_max_domain_id_show(struct bus_type *bus, char *buf)
|
|
{
|
|
int max_domain_id;
|
|
|
|
if (ap_configuration)
|
|
max_domain_id = ap_max_domain_id ? : -1;
|
|
else
|
|
max_domain_id = 15;
|
|
return snprintf(buf, PAGE_SIZE, "%d\n", max_domain_id);
|
|
}
|
|
|
|
static BUS_ATTR(ap_max_domain_id, 0444, ap_max_domain_id_show, NULL);
|
|
|
|
static struct bus_attribute *const ap_bus_attrs[] = {
|
|
&bus_attr_ap_domain,
|
|
&bus_attr_ap_control_domain_mask,
|
|
&bus_attr_config_time,
|
|
&bus_attr_poll_thread,
|
|
&bus_attr_ap_interrupts,
|
|
&bus_attr_poll_timeout,
|
|
&bus_attr_ap_max_domain_id,
|
|
NULL,
|
|
};
|
|
|
|
/**
|
|
* ap_select_domain(): Select an AP domain.
|
|
*
|
|
* Pick one of the 16 AP domains.
|
|
*/
|
|
static int ap_select_domain(void)
|
|
{
|
|
int count, max_count, best_domain;
|
|
struct ap_queue_status status;
|
|
int 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)
|
|
/* Domain has already been selected. */
|
|
return 0;
|
|
best_domain = -1;
|
|
max_count = 0;
|
|
for (i = 0; i < AP_DOMAINS; i++) {
|
|
if (!ap_test_config_domain(i))
|
|
continue;
|
|
count = 0;
|
|
for (j = 0; j < AP_DEVICES; j++) {
|
|
if (!ap_test_config_card_id(j))
|
|
continue;
|
|
status = ap_test_queue(AP_MKQID(j, i), NULL);
|
|
if (status.response_code != AP_RESPONSE_NORMAL)
|
|
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_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_scan_bus(struct work_struct *unused)
|
|
{
|
|
struct ap_device *ap_dev;
|
|
struct device *dev;
|
|
ap_qid_t qid;
|
|
int queue_depth = 0, device_type = 0;
|
|
unsigned int device_functions = 0;
|
|
int rc, i, borked;
|
|
|
|
ap_query_configuration();
|
|
if (ap_select_domain() != 0)
|
|
goto out;
|
|
|
|
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,
|
|
&device_functions);
|
|
if (dev) {
|
|
ap_dev = to_ap_dev(dev);
|
|
spin_lock_bh(&ap_dev->lock);
|
|
if (rc == -ENODEV)
|
|
ap_dev->state = AP_STATE_BORKED;
|
|
borked = ap_dev->state == AP_STATE_BORKED;
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
if (borked) /* Remove broken device */
|
|
device_unregister(dev);
|
|
put_device(dev);
|
|
if (!borked)
|
|
continue;
|
|
}
|
|
if (rc)
|
|
continue;
|
|
ap_dev = kzalloc(sizeof(*ap_dev), GFP_KERNEL);
|
|
if (!ap_dev)
|
|
break;
|
|
ap_dev->qid = qid;
|
|
ap_dev->state = AP_STATE_RESET_START;
|
|
ap_dev->interrupt = AP_INTR_DISABLED;
|
|
ap_dev->queue_depth = queue_depth;
|
|
ap_dev->raw_hwtype = device_type;
|
|
ap_dev->device_type = device_type;
|
|
ap_dev->functions = device_functions;
|
|
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);
|
|
|
|
ap_dev->device.bus = &ap_bus_type;
|
|
ap_dev->device.parent = ap_root_device;
|
|
rc = dev_set_name(&ap_dev->device, "card%02x",
|
|
AP_QID_DEVICE(ap_dev->qid));
|
|
if (rc) {
|
|
kfree(ap_dev);
|
|
continue;
|
|
}
|
|
/* Add to list of devices */
|
|
spin_lock_bh(&ap_device_list_lock);
|
|
list_add(&ap_dev->list, &ap_device_list);
|
|
spin_unlock_bh(&ap_device_list_lock);
|
|
/* Start with a device reset */
|
|
spin_lock_bh(&ap_dev->lock);
|
|
ap_sm_wait(ap_sm_event(ap_dev, AP_EVENT_POLL));
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
/* Register device */
|
|
ap_dev->device.release = ap_device_release;
|
|
rc = device_register(&ap_dev->device);
|
|
if (rc) {
|
|
spin_lock_bh(&ap_dev->lock);
|
|
list_del_init(&ap_dev->list);
|
|
spin_unlock_bh(&ap_dev->lock);
|
|
put_device(&ap_dev->device);
|
|
continue;
|
|
}
|
|
/* Add device attributes. */
|
|
rc = sysfs_create_group(&ap_dev->device.kobj,
|
|
&ap_dev_attr_group);
|
|
if (rc) {
|
|
device_unregister(&ap_dev->device);
|
|
continue;
|
|
}
|
|
}
|
|
out:
|
|
mod_timer(&ap_config_timer, jiffies + ap_config_time * HZ);
|
|
}
|
|
|
|
static void ap_config_timeout(unsigned long ptr)
|
|
{
|
|
if (ap_suspend_flag)
|
|
return;
|
|
queue_work(system_long_wq, &ap_scan_work);
|
|
}
|
|
|
|
static void ap_reset_domain(void)
|
|
{
|
|
int i;
|
|
|
|
if (ap_domain_index == -1 || !ap_test_config_domain(ap_domain_index))
|
|
return;
|
|
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++) {
|
|
if (!ap_test_config_domain(i))
|
|
continue;
|
|
for (j = 0; j < AP_DEVICES; j++) {
|
|
if (!ap_test_config_card_id(j))
|
|
continue;
|
|
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 max_domain_id;
|
|
int rc, i;
|
|
|
|
if (ap_instructions_available() != 0) {
|
|
pr_warn("The hardware system does not support AP instructions\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Get AP configuration data if available */
|
|
ap_init_configuration();
|
|
|
|
if (ap_configuration)
|
|
max_domain_id = ap_max_domain_id ? : (AP_DOMAINS - 1);
|
|
else
|
|
max_domain_id = 15;
|
|
if (ap_domain_index < -1 || ap_domain_index > max_domain_id) {
|
|
pr_warn("%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_interrupts_available()) {
|
|
rc = register_adapter_interrupt(&ap_airq);
|
|
ap_airq_flag = (rc == 0);
|
|
}
|
|
|
|
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 = PTR_RET(ap_root_device);
|
|
if (rc)
|
|
goto out_bus;
|
|
|
|
/* Setup the AP bus rescan timer. */
|
|
setup_timer(&ap_config_timer, ap_config_timeout, 0);
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
rc = register_pm_notifier(&ap_power_notifier);
|
|
if (rc)
|
|
goto out_pm;
|
|
|
|
queue_work(system_long_wq, &ap_scan_work);
|
|
initialised = true;
|
|
|
|
return 0;
|
|
|
|
out_pm:
|
|
ap_poll_thread_stop();
|
|
out_work:
|
|
hrtimer_cancel(&ap_poll_timer);
|
|
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())
|
|
unregister_adapter_interrupt(&ap_airq);
|
|
kfree(ap_configuration);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* ap_modules_exit(): The module termination code
|
|
*
|
|
* Terminates the module.
|
|
*/
|
|
void ap_module_exit(void)
|
|
{
|
|
int i;
|
|
|
|
initialised = false;
|
|
ap_reset_domain();
|
|
ap_poll_thread_stop();
|
|
del_timer_sync(&ap_config_timer);
|
|
hrtimer_cancel(&ap_poll_timer);
|
|
tasklet_kill(&ap_tasklet);
|
|
bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_devices_unregister);
|
|
for (i = 0; ap_bus_attrs[i]; i++)
|
|
bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
|
|
unregister_pm_notifier(&ap_power_notifier);
|
|
root_device_unregister(ap_root_device);
|
|
bus_unregister(&ap_bus_type);
|
|
kfree(ap_configuration);
|
|
unregister_reset_call(&ap_reset_call);
|
|
if (ap_using_interrupts())
|
|
unregister_adapter_interrupt(&ap_airq);
|
|
}
|
|
|
|
module_init(ap_module_init);
|
|
module_exit(ap_module_exit);
|