#ifndef _ASM_S390_AIRQ_H
#define _ASM_S390_AIRQ_H
-typedef void (*adapter_int_handler_t)(void *, void *);
+struct airq_struct {
+ struct hlist_node list; /* Handler queueing. */
+ void (*handler)(struct airq_struct *); /* Thin-interrupt handler */
+ u8 *lsi_ptr; /* Local-Summary-Indicator pointer */
+ u8 lsi_mask; /* Local-Summary-Indicator mask */
+ u8 isc; /* Interrupt-subclass */
+ u8 flags;
+};
-void *s390_register_adapter_interrupt(adapter_int_handler_t, void *, u8);
-void s390_unregister_adapter_interrupt(void *, u8);
+#define AIRQ_PTR_ALLOCATED 0x01
+
+int register_adapter_interrupt(struct airq_struct *airq);
+void unregister_adapter_interrupt(struct airq_struct *airq);
#endif /* _ASM_S390_AIRQ_H */
static struct intr_bucket *bucket;
-/* Adapter local summary indicator */
-static u8 *zpci_irq_si;
+/* Adapter interrupt definitions */
+static void zpci_irq_handler(struct airq_struct *airq);
+
+static struct airq_struct zpci_airq = {
+ .handler = zpci_irq_handler,
+ .isc = PCI_ISC,
+};
/* I/O Map */
static DEFINE_SPINLOCK(zpci_iomap_lock);
/* store the last handled bit to implement fair scheduling of devices */
static DEFINE_PER_CPU(unsigned long, next_sbit);
-static void zpci_irq_handler(void *dont, void *need)
+static void zpci_irq_handler(struct airq_struct *airq)
{
unsigned long sbit, mbit, last = 0, start = __get_cpu_var(next_sbit);
int rescan = 0, max = aisb_max;
goto out_alloc;
}
- isc_register(PCI_ISC);
- zpci_irq_si = s390_register_adapter_interrupt(&zpci_irq_handler, NULL, PCI_ISC);
- if (IS_ERR(zpci_irq_si)) {
- rc = PTR_ERR(zpci_irq_si);
- zpci_irq_si = NULL;
+ rc = register_adapter_interrupt(&zpci_airq);
+ if (rc)
goto out_ai;
- }
+ /* Set summary to 1 to be called every time for the ISC. */
+ *zpci_airq.lsi_ptr = 1;
for_each_online_cpu(cpu)
per_cpu(next_sbit, cpu) = 0;
spin_lock_init(&bucket->lock);
- /* set summary to 1 to be called every time for the ISC */
- *zpci_irq_si = 1;
set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
return 0;
out_ai:
- isc_unregister(PCI_ISC);
free_page((unsigned long) bucket->alloc);
out_alloc:
free_page((unsigned long) bucket->aisb);
{
free_page((unsigned long) bucket->alloc);
free_page((unsigned long) bucket->aisb);
- s390_unregister_adapter_interrupt(zpci_irq_si, PCI_ISC);
- isc_unregister(PCI_ISC);
+ unregister_adapter_interrupt(&zpci_airq);
kfree(bucket);
}
*/
#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/kernel_stat.h>
#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rculist.h>
#include <linux/slab.h>
-#include <linux/rcupdate.h>
#include <asm/airq.h>
#include <asm/isc.h>
#include "cio.h"
#include "cio_debug.h"
+#include "ioasm.h"
-#define NR_AIRQS 32
-#define NR_AIRQS_PER_WORD sizeof(unsigned long)
-#define NR_AIRQ_WORDS (NR_AIRQS / NR_AIRQS_PER_WORD)
-
-union indicator_t {
- unsigned long word[NR_AIRQ_WORDS];
- unsigned char byte[NR_AIRQS];
-} __attribute__((packed));
-
-struct airq_t {
- adapter_int_handler_t handler;
- void *drv_data;
-};
-
-static union indicator_t indicators[MAX_ISC+1];
-static struct airq_t *airqs[MAX_ISC+1][NR_AIRQS];
-
-static int register_airq(struct airq_t *airq, u8 isc)
-{
- int i;
-
- for (i = 0; i < NR_AIRQS; i++)
- if (!cmpxchg(&airqs[isc][i], NULL, airq))
- return i;
- return -ENOMEM;
-}
+static DEFINE_SPINLOCK(airq_lists_lock);
+static struct hlist_head airq_lists[MAX_ISC+1];
/**
- * s390_register_adapter_interrupt() - register adapter interrupt handler
- * @handler: adapter handler to be registered
- * @drv_data: driver data passed with each call to the handler
- * @isc: isc for which the handler should be called
+ * register_adapter_interrupt() - register adapter interrupt handler
+ * @airq: pointer to adapter interrupt descriptor
*
- * Returns:
- * Pointer to the indicator to be used on success
- * ERR_PTR() if registration failed
+ * Returns 0 on success, or -EINVAL.
*/
-void *s390_register_adapter_interrupt(adapter_int_handler_t handler,
- void *drv_data, u8 isc)
+int register_adapter_interrupt(struct airq_struct *airq)
{
- struct airq_t *airq;
- char dbf_txt[16];
- int ret;
-
- if (isc > MAX_ISC)
- return ERR_PTR(-EINVAL);
- airq = kmalloc(sizeof(struct airq_t), GFP_KERNEL);
- if (!airq) {
- ret = -ENOMEM;
- goto out;
+ char dbf_txt[32];
+
+ if (!airq->handler || airq->isc > MAX_ISC)
+ return -EINVAL;
+ if (!airq->lsi_ptr) {
+ airq->lsi_ptr = kzalloc(1, GFP_KERNEL);
+ if (!airq->lsi_ptr)
+ return -ENOMEM;
+ airq->flags |= AIRQ_PTR_ALLOCATED;
}
- airq->handler = handler;
- airq->drv_data = drv_data;
-
- ret = register_airq(airq, isc);
-out:
- snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%d", ret);
+ if (!airq->lsi_mask)
+ airq->lsi_mask = 0xff;
+ snprintf(dbf_txt, sizeof(dbf_txt), "rairq:%p", airq);
CIO_TRACE_EVENT(4, dbf_txt);
- if (ret < 0) {
- kfree(airq);
- return ERR_PTR(ret);
- } else
- return &indicators[isc].byte[ret];
+ isc_register(airq->isc);
+ spin_lock(&airq_lists_lock);
+ hlist_add_head_rcu(&airq->list, &airq_lists[airq->isc]);
+ spin_unlock(&airq_lists_lock);
+ return 0;
}
-EXPORT_SYMBOL(s390_register_adapter_interrupt);
+EXPORT_SYMBOL(register_adapter_interrupt);
/**
- * s390_unregister_adapter_interrupt - unregister adapter interrupt handler
- * @ind: indicator for which the handler is to be unregistered
- * @isc: interruption subclass
+ * unregister_adapter_interrupt - unregister adapter interrupt handler
+ * @airq: pointer to adapter interrupt descriptor
*/
-void s390_unregister_adapter_interrupt(void *ind, u8 isc)
+void unregister_adapter_interrupt(struct airq_struct *airq)
{
- struct airq_t *airq;
- char dbf_txt[16];
- int i;
+ char dbf_txt[32];
- i = (int) ((addr_t) ind) - ((addr_t) &indicators[isc].byte[0]);
- snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%d", i);
+ if (hlist_unhashed(&airq->list))
+ return;
+ snprintf(dbf_txt, sizeof(dbf_txt), "urairq:%p", airq);
CIO_TRACE_EVENT(4, dbf_txt);
- indicators[isc].byte[i] = 0;
- airq = xchg(&airqs[isc][i], NULL);
- /*
- * Allow interrupts to complete. This will ensure that the airq handle
- * is no longer referenced by any interrupt handler.
- */
- synchronize_sched();
- kfree(airq);
+ spin_lock(&airq_lists_lock);
+ hlist_del_rcu(&airq->list);
+ spin_unlock(&airq_lists_lock);
+ synchronize_rcu();
+ isc_unregister(airq->isc);
+ if (airq->flags & AIRQ_PTR_ALLOCATED) {
+ kfree(airq->lsi_ptr);
+ airq->lsi_ptr = NULL;
+ airq->flags &= ~AIRQ_PTR_ALLOCATED;
+ }
}
-EXPORT_SYMBOL(s390_unregister_adapter_interrupt);
-
-#define INDICATOR_MASK (0xffUL << ((NR_AIRQS_PER_WORD - 1) * 8))
+EXPORT_SYMBOL(unregister_adapter_interrupt);
void do_adapter_IO(u8 isc)
{
- int w;
- int i;
- unsigned long word;
- struct airq_t *airq;
-
- /*
- * Access indicator array in word-sized chunks to minimize storage
- * fetch operations.
- */
- for (w = 0; w < NR_AIRQ_WORDS; w++) {
- word = indicators[isc].word[w];
- i = w * NR_AIRQS_PER_WORD;
- /*
- * Check bytes within word for active indicators.
- */
- while (word) {
- if (word & INDICATOR_MASK) {
- airq = airqs[isc][i];
- /* Make sure gcc reads from airqs only once. */
- barrier();
- if (likely(airq))
- airq->handler(&indicators[isc].byte[i],
- airq->drv_data);
- else
- /*
- * Reset ill-behaved indicator.
- */
- indicators[isc].byte[i] = 0;
- }
- word <<= 8;
- i++;
- }
- }
+ struct airq_struct *airq;
+ struct hlist_head *head;
+
+ head = &airq_lists[isc];
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(airq, head, list)
+ if ((*airq->lsi_ptr & airq->lsi_mask) != 0)
+ airq->handler(airq);
+ rcu_read_unlock();
}
static LIST_HEAD(tiq_list);
static DEFINE_MUTEX(tiq_list_lock);
-/* adapter local summary indicator */
-static u8 *tiqdio_alsi;
+/* Adapter interrupt definitions */
+static void tiqdio_thinint_handler(struct airq_struct *airq);
+
+static struct airq_struct tiqdio_airq = {
+ .handler = tiqdio_thinint_handler,
+ .isc = QDIO_AIRQ_ISC,
+};
static struct indicator_t *q_indicators;
* @alsi: pointer to adapter local summary indicator
* @data: NULL
*/
-static void tiqdio_thinint_handler(void *alsi, void *data)
+static void tiqdio_thinint_handler(struct airq_struct *airq)
{
u32 si_used = clear_shared_ind();
struct qdio_q *q;
summary_indicator_addr = 0;
subchannel_indicator_addr = 0;
} else {
- summary_indicator_addr = virt_to_phys(tiqdio_alsi);
+ summary_indicator_addr = virt_to_phys(tiqdio_airq.lsi_ptr);
subchannel_indicator_addr = virt_to_phys(irq_ptr->dsci);
}
int __init tiqdio_register_thinints(void)
{
- isc_register(QDIO_AIRQ_ISC);
- tiqdio_alsi = s390_register_adapter_interrupt(&tiqdio_thinint_handler,
- NULL, QDIO_AIRQ_ISC);
- if (IS_ERR(tiqdio_alsi)) {
- DBF_EVENT("RTI:%lx", PTR_ERR(tiqdio_alsi));
- tiqdio_alsi = NULL;
- isc_unregister(QDIO_AIRQ_ISC);
- return -ENOMEM;
+ int rc;
+
+ rc = register_adapter_interrupt(&tiqdio_airq);
+ if (rc) {
+ DBF_EVENT("RTI:%x", rc);
+ return rc;
}
return 0;
}
void __exit tiqdio_unregister_thinints(void)
{
WARN_ON(!list_empty(&tiq_list));
-
- if (tiqdio_alsi) {
- s390_unregister_adapter_interrupt(tiqdio_alsi, QDIO_AIRQ_ISC);
- isc_unregister(QDIO_AIRQ_ISC);
- }
+ unregister_adapter_interrupt(&tiqdio_airq);
}
static int __ap_poll_device(struct ap_device *ap_dev, unsigned long *flags);
static int ap_device_remove(struct device *dev);
static int ap_device_probe(struct device *dev);
-static void ap_interrupt_handler(void *unused1, void *unused2);
+static void ap_interrupt_handler(struct airq_struct *airq);
static void ap_reset(struct ap_device *ap_dev);
static void ap_config_timeout(unsigned long ptr);
static int ap_select_domain(void);
static struct task_struct *ap_poll_kthread = NULL;
static DEFINE_MUTEX(ap_poll_thread_mutex);
static DEFINE_SPINLOCK(ap_poll_timer_lock);
-static void *ap_interrupt_indicator;
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 int user_set_domain = 0;
static struct bus_type ap_bus_type;
+/* Adapter interrupt definitions */
+static int ap_airq_flag;
+
+static struct airq_struct ap_airq = {
+ .handler = ap_interrupt_handler,
+ .isc = AP_ISC,
+};
+
/**
* ap_using_interrupts() - Returns non-zero if interrupt support is
* available.
*/
static inline int ap_using_interrupts(void)
{
- return ap_interrupt_indicator != NULL;
+ return ap_airq_flag;
}
/**
}
}
if (rc == 0 && ap_using_interrupts()) {
- rc = ap_queue_enable_interruption(qid, ap_interrupt_indicator);
+ rc = ap_queue_enable_interruption(qid, ap_airq.lsi_ptr);
/* If interruption mode is supported by the machine,
* but an AP can not be enabled for interruption then
* the AP will be discarded. */
static int ap_bus_resume(struct device *dev)
{
- int rc = 0;
struct ap_device *ap_dev = to_ap_dev(dev);
+ int rc;
if (ap_suspend_flag) {
ap_suspend_flag = 0;
- if (!ap_interrupts_available())
- ap_interrupt_indicator = NULL;
+ if (ap_interrupts_available()) {
+ if (!ap_using_interrupts()) {
+ rc = register_adapter_interrupt(&ap_airq);
+ ap_airq_flag = (rc == 0);
+ }
+ } else {
+ if (ap_using_interrupts()) {
+ unregister_adapter_interrupt(&ap_airq);
+ ap_airq_flag = 0;
+ }
+ }
ap_query_configuration();
if (!user_set_domain) {
ap_domain_index = -1;
tasklet_schedule(&ap_tasklet);
if (ap_thread_flag)
rc = ap_poll_thread_start();
- }
+ else
+ rc = 0;
+ } else
+ rc = 0;
if (AP_QID_QUEUE(ap_dev->qid) != ap_domain_index) {
spin_lock_bh(&ap_dev->lock);
ap_dev->qid = AP_MKQID(AP_QID_DEVICE(ap_dev->qid),
return rc;
}
-static void ap_interrupt_handler(void *unused1, void *unused2)
+static void ap_interrupt_handler(struct airq_struct *airq)
{
inc_irq_stat(IRQIO_APB);
tasklet_schedule(&ap_tasklet);
* important that no requests on any AP get lost.
*/
if (ap_using_interrupts())
- xchg((u8 *)ap_interrupt_indicator, 0);
+ xchg(ap_airq.lsi_ptr, 0);
do {
flags = 0;
spin_lock(&ap_device_list_lock);
return -ENODEV;
}
if (ap_interrupts_available()) {
- isc_register(AP_ISC);
- ap_interrupt_indicator = s390_register_adapter_interrupt(
- &ap_interrupt_handler, NULL, AP_ISC);
- if (IS_ERR(ap_interrupt_indicator)) {
- ap_interrupt_indicator = NULL;
- isc_unregister(AP_ISC);
- }
+ rc = register_adapter_interrupt(&ap_airq);
+ ap_airq_flag = (rc == 0);
}
register_reset_call(&ap_reset_call);
bus_unregister(&ap_bus_type);
out:
unregister_reset_call(&ap_reset_call);
- if (ap_using_interrupts()) {
- s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC);
- isc_unregister(AP_ISC);
- }
+ if (ap_using_interrupts())
+ unregister_adapter_interrupt(&ap_airq);
return rc;
}
bus_remove_file(&ap_bus_type, ap_bus_attrs[i]);
bus_unregister(&ap_bus_type);
unregister_reset_call(&ap_reset_call);
- if (ap_using_interrupts()) {
- s390_unregister_adapter_interrupt(ap_interrupt_indicator, AP_ISC);
- isc_unregister(AP_ISC);
- }
+ if (ap_using_interrupts())
+ unregister_adapter_interrupt(&ap_airq);
}
module_init(ap_module_init);
projects / platform / kernel / linux-rpi.git / commitdiff