// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright IBM Corp. 2006, 2023
* Author(s): Cornelia Huck <[email protected]>
* Martin Schwidefsky <[email protected]>
* Ralph Wuerthner <[email protected]>
* Felix Beck <[email protected]>
* Holger Dengler <[email protected]>
* Harald Freudenberger <[email protected]>
*
* Adjunct processor bus.
*/
#define KMSG_COMPONENT "ap"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kernel_stat.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/freezer.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/notifier.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#include <asm/airq.h>
#include <asm/tpi.h>
#include <linux/atomic.h>
#include <asm/isc.h>
#include <linux/hrtimer.h>
#include <linux/ktime.h>
#include <asm/facility.h>
#include <linux/crypto.h>
#include <linux/mod_devicetable.h>
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <asm/uv.h>
#include <asm/chsc.h>
#include "ap_bus.h"
#include "ap_debug.h"
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("Adjunct Processor Bus driver");
MODULE_LICENSE("GPL");
int ap_domain_index = -1; /* Adjunct Processor Domain Index */
static DEFINE_SPINLOCK(ap_domain_lock);
module_param_named(domain, ap_domain_index, int, 0440);
MODULE_PARM_DESC(domain, "domain index for ap devices");
EXPORT_SYMBOL(ap_domain_index);
static int ap_thread_flag;
module_param_named(poll_thread, ap_thread_flag, int, 0440);
MODULE_PARM_DESC(poll_thread, "Turn on/off poll thread, default is 0 (off).");
static char *apm_str;
module_param_named(apmask, apm_str, charp, 0440);
MODULE_PARM_DESC(apmask, "AP bus adapter mask.");
static char *aqm_str;
module_param_named(aqmask, aqm_str, charp, 0440);
MODULE_PARM_DESC(aqmask, "AP bus domain mask.");
static int ap_useirq = 1;
module_param_named(useirq, ap_useirq, int, 0440);
MODULE_PARM_DESC(useirq, "Use interrupt if available, default is 1 (on).");
atomic_t ap_max_msg_size = ATOMIC_INIT(AP_DEFAULT_MAX_MSG_SIZE);
EXPORT_SYMBOL(ap_max_msg_size);
static struct device *ap_root_device;
/* Hashtable of all queue devices on the AP bus */
DEFINE_HASHTABLE(ap_queues, 8);
/* lock used for the ap_queues hashtable */
DEFINE_SPINLOCK(ap_queues_lock);
/* Default permissions (ioctl, card and domain masking) */
struct ap_perms ap_perms;
EXPORT_SYMBOL(ap_perms);
DEFINE_MUTEX(ap_perms_mutex);
EXPORT_SYMBOL(ap_perms_mutex);
/* # of bindings complete since init */
static atomic64_t ap_bindings_complete_count = ATOMIC64_INIT(0);
/* completion for APQN bindings complete */
static DECLARE_COMPLETION(ap_apqn_bindings_complete);
static struct ap_config_info qci[2];
static struct ap_config_info *const ap_qci_info = &qci[0];
static struct ap_config_info *const ap_qci_info_old = &qci[1];
/*
* AP bus related debug feature things.
*/
debug_info_t *ap_dbf_info;
/*
* AP bus rescan related things.
*/
static bool ap_scan_bus(void);
static bool ap_scan_bus_result; /* result of last ap_scan_bus() */
static DEFINE_MUTEX(ap_scan_bus_mutex); /* mutex ap_scan_bus() invocations */
static atomic64_t ap_scan_bus_count; /* counter ap_scan_bus() invocations */
static int ap_scan_bus_time = AP_CONFIG_TIME;
static struct timer_list ap_scan_bus_timer;
static void ap_scan_bus_wq_callback(struct work_struct *);
static DECLARE_WORK(ap_scan_bus_work, ap_scan_bus_wq_callback);
/*
* Tasklet & timer for AP request polling and interrupts
*/
static void ap_tasklet_fn(unsigned long);
static DECLARE_TASKLET_OLD(ap_tasklet, ap_tasklet_fn);
static DECLARE_WAIT_QUEUE_HEAD(ap_poll_wait);
static struct task_struct *ap_poll_kthread;
static DEFINE_MUTEX(ap_poll_thread_mutex);
static DEFINE_SPINLOCK(ap_poll_timer_lock);
static struct hrtimer ap_poll_timer;
/*
* In LPAR poll with 4kHz frequency. Poll every 250000 nanoseconds.
* If z/VM change to 1500000 nanoseconds to adjust to z/VM polling.
*/
static unsigned long poll_high_timeout = 250000UL;
/*
* Some state machine states only require a low frequency polling.
* We use 25 Hz frequency for these.
*/
static unsigned long poll_low_timeout = 40000000UL;
/* Maximum domain id, if not given via qci */
static int ap_max_domain_id = 15;
/* Maximum adapter id, if not given via qci */
static int ap_max_adapter_id = 63;
static const struct bus_type ap_bus_type;
/* Adapter interrupt definitions */
static void ap_interrupt_handler(struct airq_struct *airq,
struct tpi_info *tpi_info);
static bool ap_irq_flag;
static struct airq_struct ap_airq = {
.handler = ap_interrupt_handler,
.isc = AP_ISC,
};
/**
* ap_airq_ptr() - Get the address of the adapter interrupt indicator
*
* Returns the address of the local-summary-indicator of the adapter
* interrupt handler for AP, or NULL if adapter interrupts are not
* available.
*/
void *ap_airq_ptr(void)
{
if (ap_irq_flag)
return ap_airq.lsi_ptr;
return NULL;
}
/**
* ap_interrupts_available(): Test if AP interrupts are available.
*
* Returns 1 if AP interrupts are available.
*/
static int ap_interrupts_available(void)
{
return test_facility(65);
}
/**
* ap_qci_available(): Test if AP configuration
* information can be queried via QCI subfunction.
*
* Returns 1 if subfunction PQAP(QCI) is available.
*/
static int ap_qci_available(void)
{
return test_facility(12);
}
/**
* ap_apft_available(): Test if AP facilities test (APFT)
* facility is available.
*
* Returns 1 if APFT is available.
*/
static int ap_apft_available(void)
{
return test_facility(15);
}
/*
* ap_qact_available(): Test if the PQAP(QACT) subfunction is available.
*
* Returns 1 if the QACT subfunction is available.
*/
static inline int ap_qact_available(void)
{
return ap_qci_info->qact;
}
/*
* ap_sb_available(): Test if the AP secure binding facility is available.
*
* Returns 1 if secure binding facility is available.
*/
int ap_sb_available(void)
{
return ap_qci_info->apsb;
}
/*
* ap_is_se_guest(): Check for SE guest with AP pass-through support.
*/
bool ap_is_se_guest(void)
{
return is_prot_virt_guest() && ap_sb_available();
}
EXPORT_SYMBOL(ap_is_se_guest);
/**
* ap_init_qci_info(): Allocate and query qci config info.
* Does also update the static variables ap_max_domain_id
* and ap_max_adapter_id if this info is available.
*/
static void __init ap_init_qci_info(void)
{
if (!ap_qci_available() ||
ap_qci(ap_qci_info)) {
AP_DBF_INFO("%s QCI not supported\n", __func__);
return;
}
memcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));
AP_DBF_INFO("%s successful fetched initial qci info\n", __func__);
if (ap_qci_info->apxa) {
if (ap_qci_info->na) {
ap_max_adapter_id = ap_qci_info->na;
AP_DBF_INFO("%s new ap_max_adapter_id is %d\n",
__func__, ap_max_adapter_id);
}
if (ap_qci_info->nd) {
ap_max_domain_id = ap_qci_info->nd;
AP_DBF_INFO("%s new ap_max_domain_id is %d\n",
__func__, ap_max_domain_id);
}
}
}
/*
* ap_test_config(): helper function to extract the nrth bit
* within the unsigned int array field.
*/
static inline int ap_test_config(unsigned int *field, unsigned int nr)
{
return ap_test_bit((field + (nr >> 5)), (nr & 0x1f));
}
/*
* ap_test_config_card_id(): Test, whether an AP card ID is configured.
*
* Returns 0 if the card is not configured
* 1 if the card is configured or
* if the configuration information is not available
*/
static inline int ap_test_config_card_id(unsigned int id)
{
if (id > ap_max_adapter_id)
return 0;
if (ap_qci_info->flags)
return ap_test_config(ap_qci_info->apm, id);
return 1;
}
/*
* ap_test_config_usage_domain(): Test, whether an AP usage domain
* is configured.
*
* Returns 0 if the usage domain is not configured
* 1 if the usage domain is configured or
* if the configuration information is not available
*/
int ap_test_config_usage_domain(unsigned int domain)
{
if (domain > ap_max_domain_id)
return 0;
if (ap_qci_info->flags)
return ap_test_config(ap_qci_info->aqm, domain);
return 1;
}
EXPORT_SYMBOL(ap_test_config_usage_domain);
/*
* ap_test_config_ctrl_domain(): Test, whether an AP control domain
* is configured.
* @domain AP control domain ID
*
* Returns 1 if the control domain is configured
* 0 in all other cases
*/
int ap_test_config_ctrl_domain(unsigned int domain)
{
if (!ap_qci_info || domain > ap_max_domain_id)
return 0;
return ap_test_config(ap_qci_info->adm, domain);
}
EXPORT_SYMBOL(ap_test_config_ctrl_domain);
/*
* ap_queue_info(): Check and get AP queue info.
* Returns: 1 if APQN exists and info is filled,
* 0 if APQN seems to exist but there is no info
* available (eg. caused by an asynch pending error)
* -1 invalid APQN, TAPQ error or AP queue status which
* indicates there is no APQN.
*/
static int ap_queue_info(ap_qid_t qid, struct ap_tapq_hwinfo *hwinfo,
bool *decfg, bool *cstop)
{
struct ap_queue_status status;
hwinfo->value = 0;
/* make sure we don't run into a specifiation exception */
if (AP_QID_CARD(qid) > ap_max_adapter_id ||
AP_QID_QUEUE(qid) > ap_max_domain_id)
return -1;
/* call TAPQ on this APQN */
status = ap_test_queue(qid, ap_apft_available(), hwinfo);
switch (status.response_code) {
case AP_RESPONSE_NORMAL:
case AP_RESPONSE_RESET_IN_PROGRESS:
case AP_RESPONSE_DECONFIGURED:
case AP_RESPONSE_CHECKSTOPPED:
case AP_RESPONSE_BUSY:
/* For all these RCs the tapq info should be available */
break;
default:
/* On a pending async error the info should be available */
if (!status.async)
return -1;
break;
}
/* There should be at least one of the mode bits set */
if (WARN_ON_ONCE(!hwinfo->value))
return 0;
*decfg = status.response_code == AP_RESPONSE_DECONFIGURED;
*cstop = status.response_code == AP_RESPONSE_CHECKSTOPPED;
return 1;
}
void ap_wait(enum ap_sm_wait wait)
{
ktime_t hr_time;
switch (wait) {
case AP_SM_WAIT_AGAIN:
case AP_SM_WAIT_INTERRUPT:
if (ap_irq_flag)
break;
if (ap_poll_kthread) {
wake_up(&ap_poll_wait);
break;
}
fallthrough;
case AP_SM_WAIT_LOW_TIMEOUT:
case AP_SM_WAIT_HIGH_TIMEOUT:
spin_lock_bh(&ap_poll_timer_lock);
if (!hrtimer_is_queued(&ap_poll_timer)) {
hr_time =
wait == AP_SM_WAIT_LOW_TIMEOUT ?
poll_low_timeout : poll_high_timeout;
hrtimer_forward_now(&ap_poll_timer, hr_time);
hrtimer_restart(&ap_poll_timer);
}
spin_unlock_bh(&ap_poll_timer_lock);
break;
case AP_SM_WAIT_NONE:
default:
break;
}
}
/**
* ap_request_timeout(): Handling of request timeouts
* @t: timer making this callback
*
* Handles request timeouts.
*/
void ap_request_timeout(struct timer_list *t)
{
struct ap_queue *aq = from_timer(aq, t, timeout);
spin_lock_bh(&aq->lock);
ap_wait(ap_sm_event(aq, AP_SM_EVENT_TIMEOUT));
spin_unlock_bh(&aq->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)
{
tasklet_schedule(&ap_tasklet);
return HRTIMER_NORESTART;
}
/**
* ap_interrupt_handler() - Schedule ap_tasklet on interrupt
* @airq: pointer to adapter interrupt descriptor
* @tpi_info: ignored
*/
static void ap_interrupt_handler(struct airq_struct *airq,
struct tpi_info *tpi_info)
{
inc_irq_stat(IRQIO_APB);
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)
{
int bkt;
struct ap_queue *aq;
enum ap_sm_wait wait = AP_SM_WAIT_NONE;
/* Reset the indicator if interrupts are used. Thus new interrupts can
* be received. Doing it in the beginning of the tasklet is therefore
* important that no requests on any AP get lost.
*/
if (ap_irq_flag)
xchg(ap_airq.lsi_ptr, 0);
spin_lock_bh(&ap_queues_lock);
hash_for_each(ap_queues, bkt, aq, hnode) {
spin_lock_bh(&aq->lock);
wait = min(wait, ap_sm_event_loop(aq, AP_SM_EVENT_POLL));
spin_unlock_bh(&aq->lock);
}
spin_unlock_bh(&ap_queues_lock);
ap_wait(wait);
}
static int ap_pending_requests(void)
{
int bkt;
struct ap_queue *aq;
spin_lock_bh(&ap_queues_lock);
hash_for_each(ap_queues, bkt, aq, hnode) {
if (aq->queue_count == 0)
continue;
spin_unlock_bh(&ap_queues_lock);
return 1;
}
spin_unlock_bh(&ap_queues_lock);
return 0;
}
/**
* 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_pending_requests()) {
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);
}
return 0;
}
static int ap_poll_thread_start(void)
{
int rc;
if (ap_irq_flag || ap_poll_kthread)
return 0;
mutex_lock(&ap_poll_thread_mutex);
ap_poll_kthread = kthread_run(ap_poll_thread, NULL, "appoll");
rc = PTR_ERR_OR_ZERO(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);
}
#define is_card_dev(x) ((x)->parent == ap_root_device)
#define is_queue_dev(x) ((x)->parent != ap_root_device)
/**
* 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, const struct device_driver *drv)
{
const 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 (is_card_dev(dev) &&
id->match_flags & AP_DEVICE_ID_MATCH_CARD_TYPE &&
id->dev_type == to_ap_dev(dev)->device_type)
return 1;
if (is_queue_dev(dev) &&
id->match_flags & AP_DEVICE_ID_MATCH_QUEUE_TYPE &&
id->dev_type == to_ap_dev(dev)->device_type)
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(const struct device *dev, struct kobj_uevent_env *env)
{
int rc = 0;
const struct ap_device *ap_dev = to_ap_dev(dev);
/* Uevents from ap bus core don't need extensions to the env */
if (dev == ap_root_device)
return 0;
if (is_card_dev(dev)) {
struct ap_card *ac = to_ap_card(&ap_dev->device);
/* Set up DEV_TYPE environment variable. */
rc = add_uevent_var(env, "DEV_TYPE=%04X", ap_dev->device_type);
if (rc)
return rc;
/* Add MODALIAS= */
rc = add_uevent_var(env, "MODALIAS=ap:t%02X", ap_dev->device_type);
if (rc)
return rc;
/* Add MODE=<accel|cca|ep11> */
if (ac->hwinfo.accel)
rc = add_uevent_var(env, "MODE=accel");
else if (ac->hwinfo.cca)
rc = add_uevent_var(env, "MODE=cca");
else if (ac->hwinfo.ep11)
rc = add_uevent_var(env, "MODE=ep11");
if (rc)
return rc;
} else {
struct ap_queue *aq = to_ap_queue(&ap_dev->device);
/* Add MODE=<accel|cca|ep11> */
if (aq->card->hwinfo.accel)
rc = add_uevent_var(env, "MODE=accel");
else if (aq->card->hwinfo.cca)
rc = add_uevent_var(env, "MODE=cca");
else if (aq->card->hwinfo.ep11)
rc = add_uevent_var(env, "MODE=ep11");
if (rc)
return rc;
}
return 0;
}
static void ap_send_init_scan_done_uevent(void)
{
char *envp[] = { "INITSCAN=done", NULL };
kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp);
}
static void ap_send_bindings_complete_uevent(void)
{
char buf[32];
char *envp[] = { "BINDINGS=complete", buf, NULL };
snprintf(buf, sizeof(buf), "COMPLETECOUNT=%llu",
atomic64_inc_return(&ap_bindings_complete_count));
kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp);
}
void ap_send_config_uevent(struct ap_device *ap_dev, bool cfg)
{
char buf[16];
char *envp[] = { buf, NULL };
snprintf(buf, sizeof(buf), "CONFIG=%d", cfg ? 1 : 0);
kobject_uevent_env(&ap_dev->device.kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(ap_send_config_uevent);
void ap_send_online_uevent(struct ap_device *ap_dev, int online)
{
char buf[16];
char *envp[] = { buf, NULL };
snprintf(buf, sizeof(buf), "ONLINE=%d", online ? 1 : 0);
kobject_uevent_env(&ap_dev->device.kobj, KOBJ_CHANGE, envp);
}
EXPORT_SYMBOL(ap_send_online_uevent);
static void ap_send_mask_changed_uevent(unsigned long *newapm,
unsigned long *newaqm)
{
char buf[100];
char *envp[] = { buf, NULL };
if (newapm)
snprintf(buf, sizeof(buf),
"APMASK=0x%016lx%016lx%016lx%016lx\n",
newapm[0], newapm[1], newapm[2], newapm[3]);
else
snprintf(buf, sizeof(buf),
"AQMASK=0x%016lx%016lx%016lx%016lx\n",
newaqm[0], newaqm[1], newaqm[2], newaqm[3]);
kobject_uevent_env(&ap_root_device->kobj, KOBJ_CHANGE, envp);
}
/*
* calc # of bound APQNs
*/
struct __ap_calc_ctrs {
unsigned int apqns;
unsigned int bound;
};
static int __ap_calc_helper(struct device *dev, void *arg)
{
struct __ap_calc_ctrs *pctrs = (struct __ap_calc_ctrs *)arg;
if (is_queue_dev(dev)) {
pctrs->apqns++;
if (dev->driver)
pctrs->bound++;
}
return 0;
}
static void ap_calc_bound_apqns(unsigned int *apqns, unsigned int *bound)
{
struct __ap_calc_ctrs ctrs;
memset(&ctrs, 0, sizeof(ctrs));
bus_for_each_dev(&ap_bus_type, NULL, (void *)&ctrs, __ap_calc_helper);
*apqns = ctrs.apqns;
*bound = ctrs.bound;
}
/*
* After ap bus scan do check if all existing APQNs are
* bound to device drivers.
*/
static void ap_check_bindings_complete(void)
{
unsigned int apqns, bound;
if (atomic64_read(&ap_scan_bus_count) >= 1) {
ap_calc_bound_apqns(&apqns, &bound);
if (bound == apqns) {
if (!completion_done(&ap_apqn_bindings_complete)) {
complete_all(&ap_apqn_bindings_complete);
ap_send_bindings_complete_uevent();
pr_debug("%s all apqn bindings complete\n", __func__);
}
}
}
}
/*
* Interface to wait for the AP bus to have done one initial ap bus
* scan and all detected APQNs have been bound to device drivers.
* If these both conditions are not fulfilled, this function blocks
* on a condition with wait_for_completion_interruptible_timeout().
* If these both conditions are fulfilled (before the timeout hits)
* the return value is 0. If the timeout (in jiffies) hits instead
* -ETIME is returned. On failures negative return values are
* returned to the caller.
*/
int ap_wait_apqn_bindings_complete(unsigned long timeout)
{
int rc = 0;
long l;
if (completion_done(&ap_apqn_bindings_complete))
return 0;
if (timeout)
l = wait_for_completion_interruptible_timeout(
&ap_apqn_bindings_complete, timeout);
else
l = wait_for_completion_interruptible(
&ap_apqn_bindings_complete);
if (l < 0)
rc = l == -ERESTARTSYS ? -EINTR : l;
else if (l == 0 && timeout)
rc = -ETIME;
pr_debug("%s rc=%d\n", __func__, rc);
return rc;
}
EXPORT_SYMBOL(ap_wait_apqn_bindings_complete);
static int __ap_queue_devices_with_id_unregister(struct device *dev, void *data)
{
if (is_queue_dev(dev) &&
AP_QID_CARD(to_ap_queue(dev)->qid) == (int)(long)data)
device_unregister(dev);
return 0;
}
static int __ap_revise_reserved(struct device *dev, void *dummy)
{
int rc, card, queue, devres, drvres;
if (is_queue_dev(dev)) {
card = AP_QID_CARD(to_ap_queue(dev)->qid);
queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
mutex_lock(&ap_perms_mutex);
devres = test_bit_inv(card, ap_perms.apm) &&
test_bit_inv(queue, ap_perms.aqm);
mutex_unlock(&ap_perms_mutex);
drvres = to_ap_drv(dev->driver)->flags
& AP_DRIVER_FLAG_DEFAULT;
if (!!devres != !!drvres) {
pr_debug("%s reprobing queue=%02x.%04x\n",
__func__, card, queue);
rc = device_reprobe(dev);
if (rc)
AP_DBF_WARN("%s reprobing queue=%02x.%04x failed\n",
__func__, card, queue);
}
}
return 0;
}
static void ap_bus_revise_bindings(void)
{
bus_for_each_dev(&ap_bus_type, NULL, NULL, __ap_revise_reserved);
}
/**
* ap_owned_by_def_drv: indicates whether an AP adapter is reserved for the
* default host driver or not.
* @card: the APID of the adapter card to check
* @queue: the APQI of the queue to check
*
* Note: the ap_perms_mutex must be locked by the caller of this function.
*
* Return: an int specifying whether the AP adapter is reserved for the host (1)
* or not (0).
*/
int ap_owned_by_def_drv(int card, int queue)
{
int rc = 0;
if (card < 0 || card >= AP_DEVICES || queue < 0 || queue >= AP_DOMAINS)
return -EINVAL;
if (test_bit_inv(card, ap_perms.apm) &&
test_bit_inv(queue, ap_perms.aqm))
rc = 1;
return rc;
}
EXPORT_SYMBOL(ap_owned_by_def_drv);
/**
* ap_apqn_in_matrix_owned_by_def_drv: indicates whether every APQN contained in
* a set is reserved for the host drivers
* or not.
* @apm: a bitmap specifying a set of APIDs comprising the APQNs to check
* @aqm: a bitmap specifying a set of APQIs comprising the APQNs to check
*
* Note: the ap_perms_mutex must be locked by the caller of this function.
*
* Return: an int specifying whether each APQN is reserved for the host (1) or
* not (0)
*/
int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
unsigned long *aqm)
{
int card, queue, rc = 0;
for (card = 0; !rc && card < AP_DEVICES; card++)
if (test_bit_inv(card, apm) &&
test_bit_inv(card, ap_perms.apm))
for (queue = 0; !rc && queue < AP_DOMAINS; queue++)
if (test_bit_inv(queue, aqm) &&
test_bit_inv(queue, ap_perms.aqm))
rc = 1;
return rc;
}
EXPORT_SYMBOL(ap_apqn_in_matrix_owned_by_def_drv);
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 card, queue, devres, drvres, rc = -ENODEV;
if (!get_device(dev))
return rc;
if (is_queue_dev(dev)) {
/*
* If the apqn is marked as reserved/used by ap bus and
* default drivers, only probe with drivers with the default
* flag set. If it is not marked, only probe with drivers
* with the default flag not set.
*/
card = AP_QID_CARD(to_ap_queue(dev)->qid);
queue = AP_QID_QUEUE(to_ap_queue(dev)->qid);
mutex_lock(&ap_perms_mutex);
devres = test_bit_inv(card, ap_perms.apm) &&
test_bit_inv(queue, ap_perms.aqm);
mutex_unlock(&ap_perms_mutex);
drvres = ap_drv->flags & AP_DRIVER_FLAG_DEFAULT;
if (!!devres != !!drvres)
goto out;
}
/*
* Rearm the bindings complete completion to trigger
* bindings complete when all devices are bound again
*/
reinit_completion(&ap_apqn_bindings_complete);
/* Add queue/card to list of active queues/cards */
spin_lock_bh(&ap_queues_lock);
if (is_queue_dev(dev))
hash_add(ap_queues, &to_ap_queue(dev)->hnode,
to_ap_queue(dev)->qid);
spin_unlock_bh(&ap_queues_lock);
rc = ap_drv->probe ? ap_drv->probe(ap_dev) : -ENODEV;
if (rc) {
spin_lock_bh(&ap_queues_lock);
if (is_queue_dev(dev))
hash_del(&to_ap_queue(dev)->hnode);
spin_unlock_bh(&ap_queues_lock);
}
out:
if (rc)
put_device(dev);
return rc;
}
static void ap_device_remove(struct device *dev)
{
struct ap_device *ap_dev = to_ap_dev(dev);
struct ap_driver *ap_drv = to_ap_drv(dev->driver);
/* prepare ap queue device removal */
if (is_queue_dev(dev))
ap_queue_prepare_remove(to_ap_queue(dev));
/* driver's chance to clean up gracefully */
if (ap_drv->remove)
ap_drv->remove(ap_dev);
/* now do the ap queue device remove */
if (is_queue_dev(dev))
ap_queue_remove(to_ap_queue(dev));
/* Remove queue/card from list of active queues/cards */
spin_lock_bh(&ap_queues_lock);
if (is_queue_dev(dev))
hash_del(&to_ap_queue(dev)->hnode);
spin_unlock_bh(&ap_queues_lock);
put_device(dev);
}
struct ap_queue *ap_get_qdev(ap_qid_t qid)
{
int bkt;
struct ap_queue *aq;
spin_lock_bh(&ap_queues_lock);
hash_for_each(ap_queues, bkt, aq, hnode) {
if (aq->qid == qid) {
get_device(&aq->ap_dev.device);
spin_unlock_bh(&ap_queues_lock);
return aq;
}
}
spin_unlock_bh(&ap_queues_lock);
return NULL;
}
EXPORT_SYMBOL(ap_get_qdev);
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->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);
/*
* Enforce a synchronous AP bus rescan.
* Returns true if the bus scan finds a change in the AP configuration
* and AP devices have been added or deleted when this function returns.
*/
bool ap_bus_force_rescan(void)
{
unsigned long scan_counter = atomic64_read(&ap_scan_bus_count);
bool rc = false;
pr_debug(">%s scan counter=%lu\n", __func__, scan_counter);
/* Only trigger AP bus scans after the initial scan is done */
if (scan_counter <= 0)
goto out;
/* Try to acquire the AP scan bus mutex */
if (mutex_trylock(&ap_scan_bus_mutex)) {
/* mutex acquired, run the AP bus scan */
ap_scan_bus_result = ap_scan_bus();
rc = ap_scan_bus_result;
mutex_unlock(&ap_scan_bus_mutex);
goto out;
}
/*
* Mutex acquire failed. So there is currently another task
* already running the AP bus scan. Then let's simple wait
* for the lock which means the other task has finished and
* stored the result in ap_scan_bus_result.
*/
if (mutex_lock_interruptible(&ap_scan_bus_mutex)) {
/* some error occurred, ignore and go out */
goto out;
}
rc = ap_scan_bus_result;
mutex_unlock(&ap_scan_bus_mutex);
out:
pr_debug("%s rc=%d\n", __func__, rc);
return rc;
}
EXPORT_SYMBOL(ap_bus_force_rescan);
/*
* A config change has happened, force an ap bus rescan.
*/
static int ap_bus_cfg_chg(struct notifier_block *nb,
unsigned long action, void *data)
{
if (action != CHSC_NOTIFY_AP_CFG)
return NOTIFY_DONE;
pr_debug("%s config change, forcing bus rescan\n", __func__);
ap_bus_force_rescan();
return NOTIFY_OK;
}
static struct notifier_block ap_bus_nb = {
.notifier_call = ap_bus_cfg_chg,
};
int ap_hex2bitmap(const char *str, unsigned long *bitmap, int bits)
{
int i, n, b;
/* bits needs to be a multiple of 8 */
if (bits & 0x07)
return -EINVAL;
if (str[0] == '0' && str[1] == 'x')
str++;
if (*str == 'x')
str++;
for (i = 0; isxdigit(*str) && i < bits; str++) {
b = hex_to_bin(*str);
for (n = 0; n < 4; n++)
if (b & (0x08 >> n))
set_bit_inv(i + n, bitmap);
i += 4;
}
if (*str == '\n')
str++;
if (*str)
return -EINVAL;
return 0;
}
EXPORT_SYMBOL(ap_hex2bitmap);
/*
* modify_bitmap() - parse bitmask argument and modify an existing
* bit mask accordingly. A concatenation (done with ',') of these
* terms is recognized:
* +<bitnr>[-<bitnr>] or -<bitnr>[-<bitnr>]
* <bitnr> may be any valid number (hex, decimal or octal) in the range
* 0...bits-1; the leading + or - is required. Here are some examples:
* +0-15,+32,-128,-0xFF
* -0-255,+1-16,+0x128
* +1,+2,+3,+4,-5,-7-10
* Returns the new bitmap after all changes have been applied. Every
* positive value in the string will set a bit and every negative value
* in the string will clear a bit. As a bit may be touched more than once,
* the last 'operation' wins:
* +0-255,-128 = first bits 0-255 will be set, then bit 128 will be
* cleared again. All other bits are unmodified.
*/
static int modify_bitmap(const char *str, unsigned long *bitmap, int bits)
{
unsigned long a, i, z;
char *np, sign;
/* bits needs to be a multiple of 8 */
if (bits & 0x07)
return -EINVAL;
while (*str) {
sign = *str++;
if (sign != '+' && sign != '-')
return -EINVAL;
a = z = simple_strtoul(str, &np, 0);
if (str == np || a >= bits)
return -EINVAL;
str = np;
if (*str == '-') {
z = simple_strtoul(++str, &np, 0);
if (str == np || a > z || z >= bits)
return -EINVAL;
str = np;
}
for (i = a; i <= z; i++)
if (sign == '+')
set_bit_inv(i, bitmap);
else
clear_bit_inv(i, bitmap);
while (*str == ',' || *str == '\n')
str++;
}
return 0;
}
static int ap_parse_bitmap_str(const char *str, unsigned long *bitmap, int bits,
unsigned long *newmap)
{
unsigned long size;
int rc;
size = BITS_TO_LONGS(bits) * sizeof(unsigned long);
if (*str == '+' || *str == '-') {
memcpy(newmap, bitmap, size);
rc = modify_bitmap(str, newmap, bits);
} else {
memset(newmap, 0, size);
rc = ap_hex2bitmap(str, newmap, bits);
}
return rc;
}
int ap_parse_mask_str(const char *str,
unsigned long *bitmap, int bits,
struct mutex *lock)
{
unsigned long *newmap, size;
int rc;
/* bits needs to be a multiple of 8 */
if (bits & 0x07)
return -EINVAL;
size = BITS_TO_LONGS(bits) * sizeof(unsigned long);
newmap = kmalloc(size, GFP_KERNEL);
if (!newmap)
return -ENOMEM;
if (mutex_lock_interruptible(lock)) {
kfree(newmap);
return -ERESTARTSYS;
}
rc = ap_parse_bitmap_str(str, bitmap, bits, newmap);
if (rc == 0)
memcpy(bitmap, newmap, size);
mutex_unlock(lock);
kfree(newmap);
return rc;
}
EXPORT_SYMBOL(ap_parse_mask_str);
/*
* AP bus attributes.
*/
static ssize_t ap_domain_show(const struct bus_type *bus, char *buf)
{
return sysfs_emit(buf, "%d\n", ap_domain_index);
}
static ssize_t ap_domain_store(const struct bus_type *bus,
const char *buf, size_t count)
{
int domain;
if (sscanf(buf, "%i\n", &domain) != 1 ||
domain < 0 || domain > ap_max_domain_id ||
!test_bit_inv(domain, ap_perms.aqm))
return -EINVAL;
spin_lock_bh(&ap_domain_lock);
ap_domain_index = domain;
spin_unlock_bh(&ap_domain_lock);
AP_DBF_INFO("%s stored new default domain=%d\n",
__func__, domain);
return count;
}
static BUS_ATTR_RW(ap_domain);
static ssize_t ap_control_domain_mask_show(const struct bus_type *bus, char *buf)
{
if (!ap_qci_info->flags) /* QCI not supported */
return sysfs_emit(buf, "not supported\n");
return sysfs_emit(buf, "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
ap_qci_info->adm[0], ap_qci_info->adm[1],
ap_qci_info->adm[2], ap_qci_info->adm[3],
ap_qci_info->adm[4], ap_qci_info->adm[5],
ap_qci_info->adm[6], ap_qci_info->adm[7]);
}
static BUS_ATTR_RO(ap_control_domain_mask);
static ssize_t ap_usage_domain_mask_show(const struct bus_type *bus, char *buf)
{
if (!ap_qci_info->flags) /* QCI not supported */
return sysfs_emit(buf, "not supported\n");
return sysfs_emit(buf, "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
ap_qci_info->aqm[0], ap_qci_info->aqm[1],
ap_qci_info->aqm[2], ap_qci_info->aqm[3],
ap_qci_info->aqm[4], ap_qci_info->aqm[5],
ap_qci_info->aqm[6], ap_qci_info->aqm[7]);
}
static BUS_ATTR_RO(ap_usage_domain_mask);
static ssize_t ap_adapter_mask_show(const struct bus_type *bus, char *buf)
{
if (!ap_qci_info->flags) /* QCI not supported */
return sysfs_emit(buf, "not supported\n");
return sysfs_emit(buf, "0x%08x%08x%08x%08x%08x%08x%08x%08x\n",
ap_qci_info->apm[0], ap_qci_info->apm[1],
ap_qci_info->apm[2], ap_qci_info->apm[3],
ap_qci_info->apm[4], ap_qci_info->apm[5],
ap_qci_info->apm[6], ap_qci_info->apm[7]);
}
static BUS_ATTR_RO(ap_adapter_mask);
static ssize_t ap_interrupts_show(const struct bus_type *bus, char *buf)
{
return sysfs_emit(buf, "%d\n", ap_irq_flag ? 1 : 0);
}
static BUS_ATTR_RO(ap_interrupts);
static ssize_t config_time_show(const struct bus_type *bus, char *buf)
{
return sysfs_emit(buf, "%d\n", ap_scan_bus_time);
}
static ssize_t config_time_store(const 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_scan_bus_time = time;
mod_timer(&ap_scan_bus_timer, jiffies + ap_scan_bus_time * HZ);
return count;
}
static BUS_ATTR_RW(config_time);
static ssize_t poll_thread_show(const struct bus_type *bus, char *buf)
{
return sysfs_emit(buf, "%d\n", ap_poll_kthread ? 1 : 0);
}
static ssize_t poll_thread_store(const struct bus_type *bus,
const char *buf, size_t count)
{
bool value;
int rc;
rc = kstrtobool(buf, &value);
if (rc)
return rc;
if (value) {
rc = ap_poll_thread_start();
if (rc)
count = rc;
} else {
ap_poll_thread_stop();
}
return count;
}
static BUS_ATTR_RW(poll_thread);
static ssize_t poll_timeout_show(const struct bus_type *bus, char *buf)
{
return sysfs_emit(buf, "%lu\n", poll_high_timeout);
}
static ssize_t poll_timeout_store(const struct bus_type *bus, const char *buf,
size_t count)
{
unsigned long value;
ktime_t hr_time;
int rc;
rc = kstrtoul(buf, 0, &value);
if (rc)
return rc;
/* 120 seconds = maximum poll interval */
if (value > 120000000000UL)
return -EINVAL;
poll_high_timeout = value;
hr_time = poll_high_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_RW(poll_timeout);
static ssize_t ap_max_domain_id_show(const struct bus_type *bus, char *buf)
{
return sysfs_emit(buf, "%d\n", ap_max_domain_id);
}
static BUS_ATTR_RO(ap_max_domain_id);
static ssize_t ap_max_adapter_id_show(const struct bus_type *bus, char *buf)
{
return sysfs_emit(buf, "%d\n", ap_max_adapter_id);
}
static BUS_ATTR_RO(ap_max_adapter_id);
static ssize_t apmask_show(const struct bus_type *bus, char *buf)
{
int rc;
if (mutex_lock_interruptible(&ap_perms_mutex))
return -ERESTARTSYS;
rc = sysfs_emit(buf, "0x%016lx%016lx%016lx%016lx\n",
ap_perms.apm[0], ap_perms.apm[1],
ap_perms.apm[2], ap_perms.apm[3]);
mutex_unlock(&ap_perms_mutex);
return rc;
}
static int __verify_card_reservations(struct device_driver *drv, void *data)
{
int rc = 0;
struct ap_driver *ap_drv = to_ap_drv(drv);
unsigned long *newapm = (unsigned long *)data;
/*
* increase the driver's module refcounter to be sure it is not
* going away when we invoke the callback function.
*/
if (!try_module_get(drv->owner))
return 0;
if (ap_drv->in_use) {
rc = ap_drv->in_use(newapm, ap_perms.aqm);
if (rc)
rc = -EBUSY;
}
/* release the driver's module */
module_put(drv->owner);
return rc;
}
static int apmask_commit(unsigned long *newapm)
{
int rc;
unsigned long reserved[BITS_TO_LONGS(AP_DEVICES)];
/*
* Check if any bits in the apmask have been set which will
* result in queues being removed from non-default drivers
*/
if (bitmap_andnot(reserved, newapm, ap_perms.apm, AP_DEVICES)) {
rc = bus_for_each_drv(&ap_bus_type, NULL, reserved,
__verify_card_reservations);
if (rc)
return rc;
}
memcpy(ap_perms.apm, newapm, APMASKSIZE);
return 0;
}
static ssize_t apmask_store(const struct bus_type *bus, const char *buf,
size_t count)
{
int rc, changes = 0;
DECLARE_BITMAP(newapm, AP_DEVICES);
if (mutex_lock_interruptible(&ap_perms_mutex))
return -ERESTARTSYS;
rc = ap_parse_bitmap_str(buf, ap_perms.apm, AP_DEVICES, newapm);
if (rc)
goto done;
changes = memcmp(ap_perms.apm, newapm, APMASKSIZE);
if (changes)
rc = apmask_commit(newapm);
done:
mutex_unlock(&ap_perms_mutex);
if (rc)
return rc;
if (changes) {
ap_bus_revise_bindings();
ap_send_mask_changed_uevent(newapm, NULL);
}
return count;
}
static BUS_ATTR_RW(apmask);
static ssize_t aqmask_show(const struct bus_type *bus, char *buf)
{
int rc;
if (mutex_lock_interruptible(&ap_perms_mutex))
return -ERESTARTSYS;
rc = sysfs_emit(buf, "0x%016lx%016lx%016lx%016lx\n",
ap_perms.aqm[0], ap_perms.aqm[1],
ap_perms.aqm[2], ap_perms.aqm[3]);
mutex_unlock(&ap_perms_mutex);
return rc;
}
static int __verify_queue_reservations(struct device_driver *drv, void *data)
{
int rc = 0;
struct ap_driver *ap_drv = to_ap_drv(drv);
unsigned long *newaqm = (unsigned long *)data;
/*
* increase the driver's module refcounter to be sure it is not
* going away when we invoke the callback function.
*/
if (!try_module_get(drv->owner))
return 0;
if (ap_drv->in_use) {
rc = ap_drv->in_use(ap_perms.apm, newaqm);
if (rc)
rc = -EBUSY;
}
/* release the driver's module */
module_put(drv->owner);
return rc;
}
static int aqmask_commit(unsigned long *newaqm)
{
int rc;
unsigned long reserved[BITS_TO_LONGS(AP_DOMAINS)];
/*
* Check if any bits in the aqmask have been set which will
* result in queues being removed from non-default drivers
*/
if (bitmap_andnot(reserved, newaqm, ap_perms.aqm, AP_DOMAINS)) {
rc = bus_for_each_drv(&ap_bus_type, NULL, reserved,
__verify_queue_reservations);
if (rc)
return rc;
}
memcpy(ap_perms.aqm, newaqm, AQMASKSIZE);
return 0;
}
static ssize_t aqmask_store(const struct bus_type *bus, const char *buf,
size_t count)
{
int rc, changes = 0;
DECLARE_BITMAP(newaqm, AP_DOMAINS);
if (mutex_lock_interruptible(&ap_perms_mutex))
return -ERESTARTSYS;
rc = ap_parse_bitmap_str(buf, ap_perms.aqm, AP_DOMAINS, newaqm);
if (rc)
goto done;
changes = memcmp(ap_perms.aqm, newaqm, APMASKSIZE);
if (changes)
rc = aqmask_commit(newaqm);
done:
mutex_unlock(&ap_perms_mutex);
if (rc)
return rc;
if (changes) {
ap_bus_revise_bindings();
ap_send_mask_changed_uevent(NULL, newaqm);
}
return count;
}
static BUS_ATTR_RW(aqmask);
static ssize_t scans_show(const struct bus_type *bus, char *buf)
{
return sysfs_emit(buf, "%llu\n", atomic64_read(&ap_scan_bus_count));
}
static ssize_t scans_store(const struct bus_type *bus, const char *buf,
size_t count)
{
AP_DBF_INFO("%s force AP bus rescan\n", __func__);
ap_bus_force_rescan();
return count;
}
static BUS_ATTR_RW(scans);
static ssize_t bindings_show(const struct bus_type *bus, char *buf)
{
int rc;
unsigned int apqns, n;
ap_calc_bound_apqns(&apqns, &n);
if (atomic64_read(&ap_scan_bus_count) >= 1 && n == apqns)
rc = sysfs_emit(buf, "%u/%u (complete)\n", n, apqns);
else
rc = sysfs_emit(buf, "%u/%u\n", n, apqns);
return rc;
}
static BUS_ATTR_RO(bindings);
static ssize_t features_show(const struct bus_type *bus, char *buf)
{
int n = 0;
if (!ap_qci_info->flags) /* QCI not supported */
return sysfs_emit(buf, "-\n");
if (ap_qci_info->apsc)
n += sysfs_emit_at(buf, n, "APSC ");
if (ap_qci_info->apxa)
n += sysfs_emit_at(buf, n, "APXA ");
if (ap_qci_info->qact)
n += sysfs_emit_at(buf, n, "QACT ");
if (ap_qci_info->rc8a)
n += sysfs_emit_at(buf, n, "RC8A ");
if (ap_qci_info->apsb)
n += sysfs_emit_at(buf, n, "APSB ");
sysfs_emit_at(buf, n == 0 ? 0 : n - 1, "\n");
return n;
}
static BUS_ATTR_RO(features);
static struct attribute *ap_bus_attrs[] = {
&bus_attr_ap_domain.attr,
&bus_attr_ap_control_domain_mask.attr,
&bus_attr_ap_usage_domain_mask.attr,
&bus_attr_ap_adapter_mask.attr,
&bus_attr_config_time.attr,
&bus_attr_poll_thread.attr,
&bus_attr_ap_interrupts.attr,
&bus_attr_poll_timeout.attr,
&bus_attr_ap_max_domain_id.attr,
&bus_attr_ap_max_adapter_id.attr,
&bus_attr_apmask.attr,
&bus_attr_aqmask.attr,
&bus_attr_scans.attr,
&bus_attr_bindings.attr,
&bus_attr_features.attr,
NULL,
};
ATTRIBUTE_GROUPS(ap_bus);
static const struct bus_type ap_bus_type = {
.name = "ap",
.bus_groups = ap_bus_groups,
.match = &ap_bus_match,
.uevent = &ap_uevent,
.probe = ap_device_probe,
.remove = ap_device_remove,
};
/**
* ap_select_domain(): Select an AP domain if possible and we haven't
* already done so before.
*/
static void ap_select_domain(void)
{
struct ap_queue_status status;
int card, dom;
/*
* Choose the default domain. Either the one specified with
* the "domain=" parameter or the first domain with at least
* one valid APQN.
*/
spin_lock_bh(&ap_domain_lock);
if (ap_domain_index >= 0) {
/* Domain has already been selected. */
goto out;
}
for (dom = 0; dom <= ap_max_domain_id; dom++) {
if (!ap_test_config_usage_domain(dom) ||
!test_bit_inv(dom, ap_perms.aqm))
continue;
for (card = 0; card <= ap_max_adapter_id; card++) {
if (!ap_test_config_card_id(card) ||
!test_bit_inv(card, ap_perms.apm))
continue;
status = ap_test_queue(AP_MKQID(card, dom),
ap_apft_available(),
NULL);
if (status.response_code == AP_RESPONSE_NORMAL)
break;
}
if (card <= ap_max_adapter_id)
break;
}
if (dom <= ap_max_domain_id) {
ap_domain_index = dom;
AP_DBF_INFO("%s new default domain is %d\n",
__func__, ap_domain_index);
}
out:
spin_unlock_bh(&ap_domain_lock);
}
/*
* This function checks the type and returns either 0 for not
* supported or the highest compatible type value (which may
* include the input type value).
*/
static int ap_get_compatible_type(ap_qid_t qid, int rawtype, unsigned int func)
{
int comp_type = 0;
/* < CEX4 is not supported */
if (rawtype < AP_DEVICE_TYPE_CEX4) {
AP_DBF_WARN("%s queue=%02x.%04x unsupported type %d\n",
__func__, AP_QID_CARD(qid),
AP_QID_QUEUE(qid), rawtype);
return 0;
}
/* up to CEX8 known and fully supported */
if (rawtype <= AP_DEVICE_TYPE_CEX8)
return rawtype;
/*
* unknown new type > CEX8, check for compatibility
* to the highest known and supported type which is
* currently CEX8 with the help of the QACT function.
*/
if (ap_qact_available()) {
struct ap_queue_status status;
union ap_qact_ap_info apinfo = {0};
apinfo.mode = (func >> 26) & 0x07;
apinfo.cat = AP_DEVICE_TYPE_CEX8;
status = ap_qact(qid, 0, &apinfo);
if (status.response_code == AP_RESPONSE_NORMAL &&
apinfo.cat >= AP_DEVICE_TYPE_CEX4 &&
apinfo.cat <= AP_DEVICE_TYPE_CEX8)
comp_type = apinfo.cat;
}
if (!comp_type)
AP_DBF_WARN("%s queue=%02x.%04x unable to map type %d\n",
__func__, AP_QID_CARD(qid),
AP_QID_QUEUE(qid), rawtype);
else if (comp_type != rawtype)
AP_DBF_INFO("%s queue=%02x.%04x map type %d to %d\n",
__func__, AP_QID_CARD(qid), AP_QID_QUEUE(qid),
rawtype, comp_type);
return comp_type;
}
/*
* Helper function to be used with bus_find_dev
* matches for the card device with the given id
*/
static int __match_card_device_with_id(struct device *dev, const void *data)
{
return is_card_dev(dev) && to_ap_card(dev)->id == (int)(long)(void *)data;
}
/*
* Helper function to be used with bus_find_dev
* matches for the queue device with a given qid
*/
static int __match_queue_device_with_qid(struct device *dev, const void *data)
{
return is_queue_dev(dev) && to_ap_queue(dev)->qid == (int)(long)data;
}
/*
* Helper function to be used with bus_find_dev
* matches any queue device with given queue id
*/
static int __match_queue_device_with_queue_id(struct device *dev, const void *data)
{
return is_queue_dev(dev) &&
AP_QID_QUEUE(to_ap_queue(dev)->qid) == (int)(long)data;
}
/* Helper function for notify_config_changed */
static int __drv_notify_config_changed(struct device_driver *drv, void *data)
{
struct ap_driver *ap_drv = to_ap_drv(drv);
if (try_module_get(drv->owner)) {
if (ap_drv->on_config_changed)
ap_drv->on_config_changed(ap_qci_info, ap_qci_info_old);
module_put(drv->owner);
}
return 0;
}
/* Notify all drivers about an qci config change */
static inline void notify_config_changed(void)
{
bus_for_each_drv(&ap_bus_type, NULL, NULL,
__drv_notify_config_changed);
}
/* Helper function for notify_scan_complete */
static int __drv_notify_scan_complete(struct device_driver *drv, void *data)
{
struct ap_driver *ap_drv = to_ap_drv(drv);
if (try_module_get(drv->owner)) {
if (ap_drv->on_scan_complete)
ap_drv->on_scan_complete(ap_qci_info,
ap_qci_info_old);
module_put(drv->owner);
}
return 0;
}
/* Notify all drivers about bus scan complete */
static inline void notify_scan_complete(void)
{
bus_for_each_drv(&ap_bus_type, NULL, NULL,
__drv_notify_scan_complete);
}
/*
* Helper function for ap_scan_bus().
* Remove card device and associated queue devices.
*/
static inline void ap_scan_rm_card_dev_and_queue_devs(struct ap_card *ac)
{
bus_for_each_dev(&ap_bus_type, NULL,
(void *)(long)ac->id,
__ap_queue_devices_with_id_unregister);
device_unregister(&ac->ap_dev.device);
}
/*
* Helper function for ap_scan_bus().
* Does the scan bus job for all the domains within
* a valid adapter given by an ap_card ptr.
*/
static inline void ap_scan_domains(struct ap_card *ac)
{
struct ap_tapq_hwinfo hwinfo;
bool decfg, chkstop;
struct ap_queue *aq;
struct device *dev;
ap_qid_t qid;
int rc, dom;
/*
* Go through the configuration for the domains and compare them
* to the existing queue devices. Also take care of the config
* and error state for the queue devices.
*/
for (dom = 0; dom <= ap_max_domain_id; dom++) {
qid = AP_MKQID(ac->id, dom);
dev = bus_find_device(&ap_bus_type, NULL,
(void *)(long)qid,
__match_queue_device_with_qid);
aq = dev ? to_ap_queue(dev) : NULL;
if (!ap_test_config_usage_domain(dom)) {
if (dev) {
AP_DBF_INFO("%s(%d,%d) not in config anymore, rm queue dev\n",
__func__, ac->id, dom);
device_unregister(dev);
}
goto put_dev_and_continue;
}
/* domain is valid, get info from this APQN */
rc = ap_queue_info(qid, &hwinfo, &decfg, &chkstop);
switch (rc) {
case -1:
if (dev) {
AP_DBF_INFO("%s(%d,%d) queue_info() failed, rm queue dev\n",
__func__, ac->id, dom);
device_unregister(dev);
}
fallthrough;
case 0:
goto put_dev_and_continue;
default:
break;
}
/* if no queue device exists, create a new one */
if (!aq) {
aq = ap_queue_create(qid, ac->ap_dev.device_type);
if (!aq) {
AP_DBF_WARN("%s(%d,%d) ap_queue_create() failed\n",
__func__, ac->id, dom);
continue;
}
aq->card = ac;
aq->config = !decfg;
aq->chkstop = chkstop;
aq->se_bstate = hwinfo.bs;
dev = &aq->ap_dev.device;
dev->bus = &ap_bus_type;
dev->parent = &ac->ap_dev.device;
dev_set_name(dev, "%02x.%04x", ac->id, dom);
/* register queue device */
rc = device_register(dev);
if (rc) {
AP_DBF_WARN("%s(%d,%d) device_register() failed\n",
__func__, ac->id, dom);
goto put_dev_and_continue;
}
/* get it and thus adjust reference counter */
get_device(dev);
if (decfg) {
AP_DBF_INFO("%s(%d,%d) new (decfg) queue dev created\n",
__func__, ac->id, dom);
} else if (chkstop) {
AP_DBF_INFO("%s(%d,%d) new (chkstop) queue dev created\n",
__func__, ac->id, dom);
} else {
/* nudge the queue's state machine */
ap_queue_init_state(aq);
AP_DBF_INFO("%s(%d,%d) new queue dev created\n",
__func__, ac->id, dom);
}
goto put_dev_and_continue;
}
/* handle state changes on already existing queue device */
spin_lock_bh(&aq->lock);
/* SE bind state */
aq->se_bstate = hwinfo.bs;
/* checkstop state */
if (chkstop && !aq->chkstop) {
/* checkstop on */
aq->chkstop = true;
if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
aq->dev_state = AP_DEV_STATE_ERROR;
aq->last_err_rc = AP_RESPONSE_CHECKSTOPPED;
}
spin_unlock_bh(&aq->lock);
pr_debug("%s(%d,%d) queue dev checkstop on\n",
__func__, ac->id, dom);
/* 'receive' pending messages with -EAGAIN */
ap_flush_queue(aq);
goto put_dev_and_continue;
} else if (!chkstop && aq->chkstop) {
/* checkstop off */
aq->chkstop = false;
if (aq->dev_state > AP_DEV_STATE_UNINITIATED)
_ap_queue_init_state(aq);
spin_unlock_bh(&aq->lock);
pr_debug("%s(%d,%d) queue dev checkstop off\n",
__func__, ac->id, dom);
goto put_dev_and_continue;
}
/* config state change */
if (decfg && aq->config) {
/* config off this queue device */
aq->config = false;
if (aq->dev_state > AP_DEV_STATE_UNINITIATED) {
aq->dev_state = AP_DEV_STATE_ERROR;
aq->last_err_rc = AP_RESPONSE_DECONFIGURED;
}
spin_unlock_bh(&aq->lock);
pr_debug("%s(%d,%d) queue dev config off\n",
__func__, ac->id, dom);
ap_send_config_uevent(&aq->ap_dev, aq->config);
/* 'receive' pending messages with -EAGAIN */
ap_flush_queue(aq);
goto put_dev_and_continue;
} else if (!decfg && !aq->config) {
/* config on this queue device */
aq->config = true;
if (aq->dev_state > AP_DEV_STATE_UNINITIATED)
_ap_queue_init_state(aq);
spin_unlock_bh(&aq->lock);
pr_debug("%s(%d,%d) queue dev config on\n",
__func__, ac->id, dom);
ap_send_config_uevent(&aq->ap_dev, aq->config);
goto put_dev_and_continue;
}
/* handle other error states */
if (!decfg && aq->dev_state == AP_DEV_STATE_ERROR) {
spin_unlock_bh(&aq->lock);
/* 'receive' pending messages with -EAGAIN */
ap_flush_queue(aq);
/* re-init (with reset) the queue device */
ap_queue_init_state(aq);
AP_DBF_INFO("%s(%d,%d) queue dev reinit enforced\n",
__func__, ac->id, dom);
goto put_dev_and_continue;
}
spin_unlock_bh(&aq->lock);
put_dev_and_continue:
put_device(dev);
}
}
/*
* Helper function for ap_scan_bus().
* Does the scan bus job for the given adapter id.
*/
static inline void ap_scan_adapter(int ap)
{
struct ap_tapq_hwinfo hwinfo;
int rc, dom, comp_type;
bool decfg, chkstop;
struct ap_card *ac;
struct device *dev;
ap_qid_t qid;
/* Is there currently a card device for this adapter ? */
dev = bus_find_device(&ap_bus_type, NULL,
(void *)(long)ap,
__match_card_device_with_id);
ac = dev ? to_ap_card(dev) : NULL;
/* Adapter not in configuration ? */
if (!ap_test_config_card_id(ap)) {
if (ac) {
AP_DBF_INFO("%s(%d) ap not in config any more, rm card and queue devs\n",
__func__, ap);
ap_scan_rm_card_dev_and_queue_devs(ac);
put_device(dev);
}
return;
}
/*
* Adapter ap is valid in the current configuration. So do some checks:
* If no card device exists, build one. If a card device exists, check
* for type and functions changed. For all this we need to find a valid
* APQN first.
*/
for (dom = 0; dom <= ap_max_domain_id; dom++)
if (ap_test_config_usage_domain(dom)) {
qid = AP_MKQID(ap, dom);
if (ap_queue_info(qid, &hwinfo, &decfg, &chkstop) > 0)
break;
}
if (dom > ap_max_domain_id) {
/* Could not find one valid APQN for this adapter */
if (ac) {
AP_DBF_INFO("%s(%d) no type info (no APQN found), rm card and queue devs\n",
__func__, ap);
ap_scan_rm_card_dev_and_queue_devs(ac);
put_device(dev);
} else {
pr_debug("%s(%d) no type info (no APQN found), ignored\n",
__func__, ap);
}
return;
}
if (!hwinfo.at) {
/* No apdater type info available, an unusable adapter */
if (ac) {
AP_DBF_INFO("%s(%d) no valid type (0) info, rm card and queue devs\n",
__func__, ap);
ap_scan_rm_card_dev_and_queue_devs(ac);
put_device(dev);
} else {
pr_debug("%s(%d) no valid type (0) info, ignored\n",
__func__, ap);
}
return;
}
hwinfo.value &= TAPQ_CARD_HWINFO_MASK; /* filter card specific hwinfo */
if (ac) {
/* Check APQN against existing card device for changes */
if (ac->hwinfo.at != hwinfo.at) {
AP_DBF_INFO("%s(%d) hwtype %d changed, rm card and queue devs\n",
__func__, ap, hwinfo.at);
ap_scan_rm_card_dev_and_queue_devs(ac);
put_device(dev);
ac = NULL;
} else if (ac->hwinfo.fac != hwinfo.fac) {
AP_DBF_INFO("%s(%d) functions 0x%08x changed, rm card and queue devs\n",
__func__, ap, hwinfo.fac);
ap_scan_rm_card_dev_and_queue_devs(ac);
put_device(dev);
ac = NULL;
} else {
/* handle checkstop state change */
if (chkstop && !ac->chkstop) {
/* checkstop on */
ac->chkstop = true;
AP_DBF_INFO("%s(%d) card dev checkstop on\n",
__func__, ap);
} else if (!chkstop && ac->chkstop) {
/* checkstop off */
ac->chkstop = false;
AP_DBF_INFO("%s(%d) card dev checkstop off\n",
__func__, ap);
}
/* handle config state change */
if (decfg && ac->config) {
ac->config = false;
AP_DBF_INFO("%s(%d) card dev config off\n",
__func__, ap);
ap_send_config_uevent(&ac->ap_dev, ac->config);
} else if (!decfg && !ac->config) {
ac->config = true;
AP_DBF_INFO("%s(%d) card dev config on\n",
__func__, ap);
ap_send_config_uevent(&ac->ap_dev, ac->config);
}
}
}
if (!ac) {
/* Build a new card device */
comp_type = ap_get_compatible_type(qid, hwinfo.at, hwinfo.fac);
if (!comp_type) {
AP_DBF_WARN("%s(%d) type %d, can't get compatibility type\n",
__func__, ap, hwinfo.at);
return;
}
ac = ap_card_create(ap, hwinfo, comp_type);
if (!ac) {
AP_DBF_WARN("%s(%d) ap_card_create() failed\n",
__func__, ap);
return;
}
ac->config = !decfg;
ac->chkstop = chkstop;
dev = &ac->ap_dev.device;
dev->bus = &ap_bus_type;
dev->parent = ap_root_device;
dev_set_name(dev, "card%02x", ap);
/* maybe enlarge ap_max_msg_size to support this card */
if (ac->maxmsgsize > atomic_read(&ap_max_msg_size)) {
atomic_set(&ap_max_msg_size, ac->maxmsgsize);
AP_DBF_INFO("%s(%d) ap_max_msg_size update to %d byte\n",
__func__, ap,
atomic_read(&ap_max_msg_size));
}
/* Register the new card device with AP bus */
rc = device_register(dev);
if (rc) {
AP_DBF_WARN("%s(%d) device_register() failed\n",
__func__, ap);
put_device(dev);
return;
}
/* get it and thus adjust reference counter */
get_device(dev);
if (decfg)
AP_DBF_INFO("%s(%d) new (decfg) card dev type=%d func=0x%08x created\n",
__func__, ap, hwinfo.at, hwinfo.fac);
else if (chkstop)
AP_DBF_INFO("%s(%d) new (chkstop) card dev type=%d func=0x%08x created\n",
__func__, ap, hwinfo.at, hwinfo.fac);
else
AP_DBF_INFO("%s(%d) new card dev type=%d func=0x%08x created\n",
__func__, ap, hwinfo.at, hwinfo.fac);
}
/* Verify the domains and the queue devices for this card */
ap_scan_domains(ac);
/* release the card device */
put_device(&ac->ap_dev.device);
}
/**
* ap_get_configuration - get the host AP configuration
*
* Stores the host AP configuration information returned from the previous call
* to Query Configuration Information (QCI), then retrieves and stores the
* current AP configuration returned from QCI.
*
* Return: true if the host AP configuration changed between calls to QCI;
* otherwise, return false.
*/
static bool ap_get_configuration(void)
{
if (!ap_qci_info->flags) /* QCI not supported */
return false;
memcpy(ap_qci_info_old, ap_qci_info, sizeof(*ap_qci_info));
ap_qci(ap_qci_info);
return memcmp(ap_qci_info, ap_qci_info_old,
sizeof(struct ap_config_info)) != 0;
}
/*
* ap_config_has_new_aps - Check current against old qci info if
* new adapters have appeared. Returns true if at least one new
* adapter in the apm mask is showing up. Existing adapters or
* receding adapters are not counted.
*/
static bool ap_config_has_new_aps(void)
{
unsigned long m[BITS_TO_LONGS(AP_DEVICES)];
if (!ap_qci_info->flags)
return false;
bitmap_andnot(m, (unsigned long *)ap_qci_info->apm,
(unsigned long *)ap_qci_info_old->apm, AP_DEVICES);
if (!bitmap_empty(m, AP_DEVICES))
return true;
return false;
}
/*
* ap_config_has_new_doms - Check current against old qci info if
* new (usage) domains have appeared. Returns true if at least one
* new domain in the aqm mask is showing up. Existing domains or
* receding domains are not counted.
*/
static bool ap_config_has_new_doms(void)
{
unsigned long m[BITS_TO_LONGS(AP_DOMAINS)];
if (!ap_qci_info->flags)
return false;
bitmap_andnot(m, (unsigned long *)ap_qci_info->aqm,
(unsigned long *)ap_qci_info_old->aqm, AP_DOMAINS);
if (!bitmap_empty(m, AP_DOMAINS))
return true;
return false;
}
/**
* ap_scan_bus(): Scan the AP bus for new devices
* Always run under mutex ap_scan_bus_mutex protection
* which needs to get locked/unlocked by the caller!
* Returns true if any config change has been detected
* during the scan, otherwise false.
*/
static bool ap_scan_bus(void)
{
bool config_changed;
int ap;
pr_debug(">%s\n", __func__);
/* (re-)fetch configuration via QCI */
config_changed = ap_get_configuration();
if (config_changed) {
if (ap_config_has_new_aps() || ap_config_has_new_doms()) {
/*
* Appearance of new adapters and/or domains need to
* build new ap devices which need to get bound to an
* device driver. Thus reset the APQN bindings complete
* completion.
*/
reinit_completion(&ap_apqn_bindings_complete);
}
/* post a config change notify */
notify_config_changed();
}
ap_select_domain();
/* loop over all possible adapters */
for (ap = 0; ap <= ap_max_adapter_id; ap++)
ap_scan_adapter(ap);
/* scan complete notify */
if (config_changed)
notify_scan_complete();
/* check if there is at least one queue available with default domain */
if (ap_domain_index >= 0) {
struct device *dev =
bus_find_device(&ap_bus_type, NULL,
(void *)(long)ap_domain_index,
__match_queue_device_with_queue_id);
if (dev)
put_device(dev);
else
AP_DBF_INFO("%s no queue device with default domain %d available\n",
__func__, ap_domain_index);
}
if (atomic64_inc_return(&ap_scan_bus_count) == 1) {
pr_debug("%s init scan complete\n", __func__);
ap_send_init_scan_done_uevent();
}
ap_check_bindings_complete();
mod_timer(&ap_scan_bus_timer, jiffies + ap_scan_bus_time * HZ);
pr_debug("<%s config_changed=%d\n", __func__, config_changed);
return config_changed;
}
/*
* Callback for the ap_scan_bus_timer
* Runs periodically, workqueue timer (ap_scan_bus_time)
*/
static void ap_scan_bus_timer_callback(struct timer_list *unused)
{
/*
* schedule work into the system long wq which when
* the work is finally executed, calls the AP bus scan.
*/
queue_work(system_long_wq, &ap_scan_bus_work);
}
/*
* Callback for the ap_scan_bus_work
*/
static void ap_scan_bus_wq_callback(struct work_struct *unused)
{
/*
* Try to invoke an ap_scan_bus(). If the mutex acquisition
* fails there is currently another task already running the
* AP scan bus and there is no need to wait and re-trigger the
* scan again. Please note at the end of the scan bus function
* the AP scan bus timer is re-armed which triggers then the
* ap_scan_bus_timer_callback which enqueues a work into the
* system_long_wq which invokes this function here again.
*/
if (mutex_trylock(&ap_scan_bus_mutex)) {
ap_scan_bus_result = ap_scan_bus();
mutex_unlock(&ap_scan_bus_mutex);
}
}
static inline void __exit ap_async_exit(void)
{
if (ap_thread_flag)
ap_poll_thread_stop();
chsc_notifier_unregister(&ap_bus_nb);
cancel_work(&ap_scan_bus_work);
hrtimer_cancel(&ap_poll_timer);
timer_delete(&ap_scan_bus_timer);
}
static inline int __init ap_async_init(void)
{
int rc;
/* Setup the AP bus rescan timer. */
timer_setup(&ap_scan_bus_timer, ap_scan_bus_timer_callback, 0);
/*
* Setup the high resolution poll timer.
* If we are running under z/VM adjust polling to z/VM polling rate.
*/
if (MACHINE_IS_VM)
poll_high_timeout = 1500000;
hrtimer_init(&ap_poll_timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
ap_poll_timer.function = ap_poll_timeout;
queue_work(system_long_wq, &ap_scan_bus_work);
rc = chsc_notifier_register(&ap_bus_nb);
if (rc)
goto out;
/* Start the low priority AP bus poll thread. */
if (!ap_thread_flag)
return 0;
rc = ap_poll_thread_start();
if (rc)
goto out_notifier;
return 0;
out_notifier:
chsc_notifier_unregister(&ap_bus_nb);
out:
cancel_work(&ap_scan_bus_work);
hrtimer_cancel(&ap_poll_timer);
timer_delete(&ap_scan_bus_timer);
return rc;
}
static inline void ap_irq_exit(void)
{
if (ap_irq_flag)
unregister_adapter_interrupt(&ap_airq);
}
static inline int __init ap_irq_init(void)
{
int rc;
if (!ap_interrupts_available() || !ap_useirq)
return 0;
rc = register_adapter_interrupt(&ap_airq);
ap_irq_flag = (rc == 0);
return rc;
}
static inline void ap_debug_exit(void)
{
debug_unregister(ap_dbf_info);
}
static inline int __init ap_debug_init(void)
{
ap_dbf_info = debug_register("ap", 2, 1,
AP_DBF_MAX_SPRINTF_ARGS * sizeof(long));
debug_register_view(ap_dbf_info, &debug_sprintf_view);
debug_set_level(ap_dbf_info, DBF_ERR);
return 0;
}
static void __init ap_perms_init(void)
{
/* all resources usable if no kernel parameter string given */
memset(&ap_perms.ioctlm, 0xFF, sizeof(ap_perms.ioctlm));
memset(&ap_perms.apm, 0xFF, sizeof(ap_perms.apm));
memset(&ap_perms.aqm, 0xFF, sizeof(ap_perms.aqm));
/* apm kernel parameter string */
if (apm_str) {
memset(&ap_perms.apm, 0, sizeof(ap_perms.apm));
ap_parse_mask_str(apm_str, ap_perms.apm, AP_DEVICES,
&ap_perms_mutex);
}
/* aqm kernel parameter string */
if (aqm_str) {
memset(&ap_perms.aqm, 0, sizeof(ap_perms.aqm));
ap_parse_mask_str(aqm_str, ap_perms.aqm, AP_DOMAINS,
&ap_perms_mutex);
}
}
/**
* ap_module_init(): The module initialization code.
*
* Initializes the module.
*/
static int __init ap_module_init(void)
{
int rc;
rc = ap_debug_init();
if (rc)
return rc;
if (!ap_instructions_available()) {
pr_warn("The hardware system does not support AP instructions\n");
return -ENODEV;
}
/* init ap_queue hashtable */
hash_init(ap_queues);
/* set up the AP permissions (ioctls, ap and aq masks) */
ap_perms_init();
/* Get AP configuration data if available */
ap_init_qci_info();
/* check default domain setting */
if (ap_domain_index < -1 || ap_domain_index > ap_max_domain_id ||
(ap_domain_index >= 0 &&
!test_bit_inv(ap_domain_index, ap_perms.aqm))) {
pr_warn("%d is not a valid cryptographic domain\n",
ap_domain_index);
ap_domain_index = -1;
}
/* Create /sys/bus/ap. */
rc = bus_register(&ap_bus_type);
if (rc)
goto out;
/* Create /sys/devices/ap. */
ap_root_device = root_device_register("ap");
rc = PTR_ERR_OR_ZERO(ap_root_device);
if (rc)
goto out_bus;
ap_root_device->bus = &ap_bus_type;
/* enable interrupts if available */
rc = ap_irq_init();
if (rc)
goto out_device;
/* Setup asynchronous work (timers, workqueue, etc). */
rc = ap_async_init();
if (rc)
goto out_irq;
return 0;
out_irq:
ap_irq_exit();
out_device:
root_device_unregister(ap_root_device);
out_bus:
bus_unregister(&ap_bus_type);
out:
ap_debug_exit();
return rc;
}
static void __exit ap_module_exit(void)
{
ap_async_exit();
ap_irq_exit();
root_device_unregister(ap_root_device);
bus_unregister(&ap_bus_type);
ap_debug_exit();
}
module_init(ap_module_init);
module_exit(ap_module_exit);
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