--- /dev/null
+/*
+ * linux/drivers/s390/crypto/ap_bus.c
+ *
+ * Copyright (C) 2006 IBM Corporation
+ * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
+ * Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Ralph Wuerthner <rwuerthn@de.ibm.com>
+ *
+ * Adjunct processor bus.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/notifier.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <asm/s390_rdev.h>
+
+#include "ap_bus.h"
+
+/* Some prototypes. */
+static void ap_scan_bus(void *);
+static void ap_poll_all(unsigned long);
+static void ap_poll_timeout(unsigned long);
+static int ap_poll_thread_start(void);
+static void ap_poll_thread_stop(void);
+
+/**
+ * Module description.
+ */
+MODULE_AUTHOR("IBM Corporation");
+MODULE_DESCRIPTION("Adjunct Processor Bus driver, "
+ "Copyright 2006 IBM Corporation");
+MODULE_LICENSE("GPL");
+
+/**
+ * Module parameter
+ */
+int ap_domain_index = -1; /* Adjunct Processor Domain Index */
+module_param_named(domain, ap_domain_index, int, 0000);
+MODULE_PARM_DESC(domain, "domain index for ap devices");
+EXPORT_SYMBOL(ap_domain_index);
+
+static int ap_thread_flag = 1;
+module_param_named(poll_thread, ap_thread_flag, int, 0000);
+MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 1 (on).");
+
+static struct device *ap_root_device = NULL;
+
+/**
+ * Workqueue & timer for bus rescan.
+ */
+static struct workqueue_struct *ap_work_queue;
+static struct timer_list ap_config_timer;
+static int ap_config_time = AP_CONFIG_TIME;
+static DECLARE_WORK(ap_config_work, ap_scan_bus, NULL);
+
+/**
+ * Tasklet & timer for AP request polling.
+ */
+static struct timer_list ap_poll_timer = TIMER_INITIALIZER(ap_poll_timeout,0,0);
+static DECLARE_TASKLET(ap_tasklet, ap_poll_all, 0);
+static atomic_t ap_poll_requests = ATOMIC_INIT(0);
+static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
+static struct task_struct *ap_poll_kthread = NULL;
+static DEFINE_MUTEX(ap_poll_thread_mutex);
+
+/**
+ * Test if ap instructions are available.
+ *
+ * Returns 0 if the ap instructions are installed.
+ */
+static inline int ap_instructions_available(void)
+{
+ register unsigned long reg0 asm ("0") = AP_MKQID(0,0);
+ register unsigned long reg1 asm ("1") = -ENODEV;
+ register unsigned long reg2 asm ("2") = 0UL;
+
+ asm volatile(
+ " .long 0xb2af0000\n" /* PQAP(TAPQ) */
+ "0: la %1,0\n"
+ "1:\n"
+ EX_TABLE(0b, 1b)
+ : "+d" (reg0), "+d" (reg1), "+d" (reg2) : : "cc" );
+ return reg1;
+}
+
+/**
+ * Test adjunct processor queue.
+ * @qid: the ap queue number
+ * @queue_depth: pointer to queue depth value
+ * @device_type: pointer to device type value
+ *
+ * Returns ap queue status structure.
+ */
+static inline struct ap_queue_status
+ap_test_queue(ap_qid_t qid, int *queue_depth, int *device_type)
+{
+ register unsigned long reg0 asm ("0") = qid;
+ register struct ap_queue_status reg1 asm ("1");
+ register unsigned long reg2 asm ("2") = 0UL;
+
+ asm volatile(".long 0xb2af0000" /* PQAP(TAPQ) */
+ : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
+ *device_type = (int) (reg2 >> 24);
+ *queue_depth = (int) (reg2 & 0xff);
+ return reg1;
+}
+
+/**
+ * Reset adjunct processor queue.
+ * @qid: the ap queue number
+ *
+ * Returns ap queue status structure.
+ */
+static inline struct ap_queue_status ap_reset_queue(ap_qid_t qid)
+{
+ register unsigned long reg0 asm ("0") = qid | 0x01000000UL;
+ register struct ap_queue_status reg1 asm ("1");
+ register unsigned long reg2 asm ("2") = 0UL;
+
+ asm volatile(
+ ".long 0xb2af0000" /* PQAP(RAPQ) */
+ : "+d" (reg0), "=d" (reg1), "+d" (reg2) : : "cc");
+ return reg1;
+}
+
+/**
+ * Send message to adjunct processor queue.
+ * @qid: the ap queue number
+ * @psmid: the program supplied message identifier
+ * @msg: the message text
+ * @length: the message length
+ *
+ * Returns ap queue status structure.
+ *
+ * Condition code 1 on NQAP can't happen because the L bit is 1.
+ *
+ * Condition code 2 on NQAP also means the send is incomplete,
+ * because a segment boundary was reached. The NQAP is repeated.
+ */
+static inline struct ap_queue_status
+__ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
+{
+ typedef struct { char _[length]; } msgblock;
+ register unsigned long reg0 asm ("0") = qid | 0x40000000UL;
+ register struct ap_queue_status reg1 asm ("1");
+ register unsigned long reg2 asm ("2") = (unsigned long) msg;
+ register unsigned long reg3 asm ("3") = (unsigned long) length;
+ register unsigned long reg4 asm ("4") = (unsigned int) (psmid >> 32);
+ register unsigned long reg5 asm ("5") = (unsigned int) psmid;
+
+ asm volatile (
+ "0: .long 0xb2ad0042\n" /* DQAP */
+ " brc 2,0b"
+ : "+d" (reg0), "=d" (reg1), "+d" (reg2), "+d" (reg3)
+ : "d" (reg4), "d" (reg5), "m" (*(msgblock *) msg)
+ : "cc" );
+ return reg1;
+}
+
+int ap_send(ap_qid_t qid, unsigned long long psmid, void *msg, size_t length)
+{
+ struct ap_queue_status status;
+
+ status = __ap_send(qid, psmid, msg, length);
+ switch (status.response_code) {
+ case AP_RESPONSE_NORMAL:
+ return 0;
+ case AP_RESPONSE_Q_FULL:
+ return -EBUSY;
+ default: /* Device is gone. */
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL(ap_send);
+
+/*
+ * Receive message from adjunct processor queue.
+ * @qid: the ap queue number
+ * @psmid: pointer to program supplied message identifier
+ * @msg: the message text
+ * @length: the message length
+ *
+ * Returns ap queue status structure.
+ *
+ * Condition code 1 on DQAP means the receive has taken place
+ * but only partially. The response is incomplete, hence the
+ * DQAP is repeated.
+ *
+ * Condition code 2 on DQAP also means the receive is incomplete,
+ * this time because a segment boundary was reached. Again, the
+ * DQAP is repeated.
+ *
+ * Note that gpr2 is used by the DQAP instruction to keep track of
+ * any 'residual' length, in case the instruction gets interrupted.
+ * Hence it gets zeroed before the instruction.
+ */
+static inline struct ap_queue_status
+__ap_recv(ap_qid_t qid, unsigned long long *psmid, void *msg, size_t length)
+{
+ typedef struct { char _[length]; } msgblock;
+ register unsigned long reg0 asm("0") = qid | 0x80000000UL;
+ register struct ap_queue_status reg1 asm ("1");
+ register unsigned long reg2 asm("2") = 0UL;
+ register unsigned long reg4 asm("4") = (unsigned long) msg;
+ register unsigned long reg5 asm("5") = (unsigned long) length;
+ register unsigned long reg6 asm("6") = 0UL;
+ register unsigned long reg7 asm("7") = 0UL;
+
+
+ asm volatile(
+ "0: .long 0xb2ae0064\n"
+ " 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;
+ default:
+ return -ENODEV;
+ }
+}
+EXPORT_SYMBOL(ap_recv);
+
+/**
+ * Check if an AP queue is available. The test is repeated for
+ * AP_MAX_RESET times.
+ * @qid: the ap queue number
+ * @queue_depth: pointer to queue depth value
+ * @device_type: pointer to device type value
+ */
+static int ap_query_queue(ap_qid_t qid, int *queue_depth, int *device_type)
+{
+ struct ap_queue_status status;
+ int t_depth, t_device_type, rc, i;
+
+ rc = -EBUSY;
+ for (i = 0; i < AP_MAX_RESET; i++) {
+ status = ap_test_queue(qid, &t_depth, &t_device_type);
+ switch (status.response_code) {
+ case AP_RESPONSE_NORMAL:
+ *queue_depth = t_depth + 1;
+ *device_type = t_device_type;
+ rc = 0;
+ break;
+ case AP_RESPONSE_Q_NOT_AVAIL:
+ rc = -ENODEV;
+ break;
+ case AP_RESPONSE_RESET_IN_PROGRESS:
+ break;
+ case AP_RESPONSE_DECONFIGURED:
+ rc = -ENODEV;
+ break;
+ case AP_RESPONSE_CHECKSTOPPED:
+ rc = -ENODEV;
+ break;
+ case AP_RESPONSE_BUSY:
+ break;
+ default:
+ BUG();
+ }
+ if (rc != -EBUSY)
+ break;
+ if (i < AP_MAX_RESET - 1)
+ udelay(5);
+ }
+ return rc;
+}
+
+/**
+ * Reset an AP queue and wait for it to become available again.
+ * @qid: the ap queue number
+ */
+static int ap_init_queue(ap_qid_t qid)
+{
+ struct ap_queue_status status;
+ int rc, dummy, i;
+
+ rc = -ENODEV;
+ status = ap_reset_queue(qid);
+ for (i = 0; i < AP_MAX_RESET; i++) {
+ switch (status.response_code) {
+ case AP_RESPONSE_NORMAL:
+ if (status.queue_empty)
+ rc = 0;
+ break;
+ case AP_RESPONSE_Q_NOT_AVAIL:
+ case AP_RESPONSE_DECONFIGURED:
+ case AP_RESPONSE_CHECKSTOPPED:
+ i = AP_MAX_RESET; /* return with -ENODEV */
+ break;
+ case AP_RESPONSE_RESET_IN_PROGRESS:
+ case AP_RESPONSE_BUSY:
+ default:
+ break;
+ }
+ if (rc != -ENODEV)
+ break;
+ if (i < AP_MAX_RESET - 1) {
+ udelay(5);
+ status = ap_test_queue(qid, &dummy, &dummy);
+ }
+ }
+ return rc;
+}
+
+/**
+ * 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 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;
+}
+
+/**
+ * uevent function for AP devices. It sets up a single environment
+ * variable DEV_TYPE which contains the hardware device type.
+ */
+static int ap_uevent (struct device *dev, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ struct ap_device *ap_dev = to_ap_dev(dev);
+ int length;
+
+ if (!ap_dev)
+ return -ENODEV;
+
+ /* Set up DEV_TYPE environment variable. */
+ envp[0] = buffer;
+ length = scnprintf(buffer, buffer_size, "DEV_TYPE=%04X",
+ ap_dev->device_type);
+ if (buffer_size - length <= 0)
+ return -ENOMEM;
+ envp[1] = 0;
+ return 0;
+}
+
+static struct bus_type ap_bus_type = {
+ .name = "ap",
+ .match = &ap_bus_match,
+ .uevent = &ap_uevent,
+};
+
+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->unregistered = 1;
+ return rc;
+}
+
+/**
+ * Flush all requests from the request/pending queue of an AP device.
+ * @ap_dev: pointer to the AP device.
+ */
+static inline 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;
+
+ spin_lock_bh(&ap_dev->lock);
+ __ap_flush_queue(ap_dev);
+ /**
+ * set ->unregistered to 1 while holding the lock. This prevents
+ * new messages to be put on the queue from now on.
+ */
+ ap_dev->unregistered = 1;
+ spin_unlock_bh(&ap_dev->lock);
+ if (ap_drv->remove)
+ ap_drv->remove(ap_dev);
+ 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_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 struct bus_attribute *const ap_bus_attrs[] = {
+ &bus_attr_ap_domain,
+ &bus_attr_config_time,
+ &bus_attr_poll_thread,
+ NULL
+};
+
+/**
+ * Pick one of the 16 ap domains.
+ */
+static inline 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;
+}
+
+/**
+ * Find the device type if query queue returned a device type of 0.
+ * @ap_dev: pointer to the AP device.
+ */
+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));
+ 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;
+}
+
+/**
+ * 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(void *data)
+{
+ 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);
+ if (dev) {
+ put_device(dev);
+ continue;
+ }
+ rc = ap_query_queue(qid, &queue_depth, &device_type);
+ 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;
+ spin_lock_init(&ap_dev->lock);
+ INIT_LIST_HEAD(&ap_dev->pendingq);
+ INIT_LIST_HEAD(&ap_dev->requestq);
+ 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;
+ snprintf(ap_dev->device.bus_id, BUS_ID_SIZE, "card%02x",
+ AP_QID_DEVICE(ap_dev->qid));
+ ap_dev->device.release = ap_device_release;
+ rc = device_register(&ap_dev->device);
+ if (rc) {
+ kfree(ap_dev);
+ continue;
+ }
+ /* Add device attributes. */
+ rc = sysfs_create_group(&ap_dev->device.kobj,
+ &ap_dev_attr_group);
+ if (rc)
+ 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);
+}
+
+/**
+ * Set up the timer to run the poll tasklet
+ */
+static inline void ap_schedule_poll_timer(void)
+{
+ if (timer_pending(&ap_poll_timer))
+ return;
+ mod_timer(&ap_poll_timer, jiffies + AP_POLL_TIME);
+}
+
+/**
+ * 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 inline 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_dev->queue_count--;
+ 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. */
+ 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;
+}
+
+/**
+ * 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 inline 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);
+ switch (status.response_code) {
+ case AP_RESPONSE_NORMAL:
+ atomic_inc(&ap_poll_requests);
+ ap_dev->queue_count++;
+ 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:
+ *flags |= 2;
+ break;
+ case AP_RESPONSE_MESSAGE_TOO_BIG:
+ return -EINVAL;
+ default:
+ return -ENODEV;
+ }
+ return 0;
+}
+
+/**
+ * Poll AP device for pending replies and send new messages. If either
+ * ap_poll_read or ap_poll_write returns -ENODEV unregister the device.
+ * @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
+ * 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);
+}
+
+/**
+ * Queue a message to a device.
+ * @ap_dev: pointer to the AP device
+ * @ap_msg: the message to be queued
+ */
+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);
+ 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_dev->queue_count++;
+ ap_dev->total_request_count++;
+ break;
+ case AP_RESPONSE_Q_FULL:
+ list_add_tail(&ap_msg->list, &ap_dev->requestq);
+ ap_dev->requestq_count++;
+ ap_dev->total_request_count++;
+ return -EBUSY;
+ 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);
+ } else {
+ ap_dev->drv->receive(ap_dev, ap_msg, ERR_PTR(-ENODEV));
+ rc = 0;
+ }
+ spin_unlock_bh(&ap_dev->lock);
+ if (rc == -ENODEV)
+ device_unregister(&ap_dev->device);
+}
+EXPORT_SYMBOL(ap_queue_message);
+
+/**
+ * Cancel a crypto request. This is done by removing the request
+ * from the devive pendingq or requestq 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.
+ * @ap_dev: AP device that has the message queued
+ * @ap_msg: the message that is to be removed
+ */
+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 receive polling for finished AP requests
+ */
+static void ap_poll_timeout(unsigned long unused)
+{
+ tasklet_schedule(&ap_tasklet);
+}
+
+/**
+ * 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 int __ap_poll_all(struct device *dev, void *data)
+{
+ struct ap_device *ap_dev = to_ap_dev(dev);
+ int rc;
+
+ spin_lock(&ap_dev->lock);
+ if (!ap_dev->unregistered) {
+ rc = ap_poll_queue(to_ap_dev(dev), (unsigned long *) data);
+ } else
+ rc = 0;
+ spin_unlock(&ap_dev->lock);
+ if (rc)
+ device_unregister(&ap_dev->device);
+ return 0;
+}
+
+static void ap_poll_all(unsigned long dummy)
+{
+ unsigned long flags;
+
+ do {
+ flags = 0;
+ bus_for_each_dev(&ap_bus_type, NULL, &flags, __ap_poll_all);
+ } while (flags & 1);
+ if (flags & 2)
+ ap_schedule_poll_timer();
+}
+
+/**
+ * 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;
+
+ set_user_nice(current, -20);
+ while (1) {
+ 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);
+
+ local_bh_disable();
+ flags = 0;
+ bus_for_each_dev(&ap_bus_type, NULL, &flags, __ap_poll_all);
+ local_bh_enable();
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&ap_poll_wait, &wait);
+ return 0;
+}
+
+static int ap_poll_thread_start(void)
+{
+ int rc;
+
+ 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);
+}
+
+/**
+ * The module initialization code.
+ */
+int __init ap_module_init(void)
+{
+ int rc, i;
+
+ if (ap_domain_index < -1 || ap_domain_index >= AP_DOMAINS) {
+ printk(KERN_WARNING "Invalid param: domain = %d. "
+ " Not loading.\n", ap_domain_index);
+ return -EINVAL;
+ }
+ if (ap_instructions_available() != 0) {
+ printk(KERN_WARNING "AP instructions not installed.\n");
+ return -ENODEV;
+ }
+
+ /* 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 = s390_root_dev_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);
+
+ /* 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);
+ del_timer_sync(&ap_poll_timer);
+ destroy_workqueue(ap_work_queue);
+out_root:
+ s390_root_dev_unregister(ap_root_device);
+out_bus:
+ while (i--)
+ bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
+ bus_unregister(&ap_bus_type);
+out:
+ return rc;
+}
+
+static int __ap_match_all(struct device *dev, void *data)
+{
+ return 1;
+}
+
+/**
+ * The module termination code
+ */
+void ap_module_exit(void)
+{
+ int i;
+ struct device *dev;
+
+ ap_poll_thread_stop();
+ del_timer_sync(&ap_config_timer);
+ del_timer_sync(&ap_poll_timer);
+ destroy_workqueue(ap_work_queue);
+ s390_root_dev_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);
+}
+
+#ifndef CONFIG_ZCRYPT_MONOLITHIC
+module_init(ap_module_init);
+module_exit(ap_module_exit);
+#endif
projects / linux-2.6 / commitdiff