| /* |
| * 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; |
| 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; |
| |
| ap_flush_queue(ap_dev); |
| 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; |
| ap_dev->unregistered = 1; |
| 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) { |
| spin_lock_bh(&ap_dev->lock); |
| ap_dev->unregistered = 0; |
| spin_unlock_bh(&ap_dev->lock); |
| } |
| else |
| device_unregister(&ap_dev->device); |
| } |
| } |
| |
| static void |
| ap_config_timeout(unsigned long ptr) |
| { |
| queue_work(ap_work_queue, &ap_config_work); |
| ap_config_timer.expires = jiffies + ap_config_time * HZ; |
| add_timer(&ap_config_timer); |
| } |
| |
| /** |
| * 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); |
| if (rc == -ENODEV) |
| ap_dev->unregistered = 1; |
| } 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); |
| if (rc) |
| ap_dev->unregistered = 1; |
| } 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, 19); |
| 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 |