s390/airq: introduce adapter interrupt vector helper
The PCI code is the first user of adapter interrupts vectors.
Add a set of helpers to airq.c to separate the adatper interrupt
code from the PCI bits. The helpers allow for adapter interrupt
vectors of any size.
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/airq.c b/drivers/s390/cio/airq.c
index 91edbd7..6ead6d0 100644
--- a/drivers/s390/cio/airq.c
+++ b/drivers/s390/cio/airq.c
@@ -93,3 +93,156 @@
airq->handler(airq);
rcu_read_unlock();
}
+
+/**
+ * airq_iv_create - create an interrupt vector
+ * @bits: number of bits in the interrupt vector
+ * @flags: allocation flags
+ *
+ * Returns a pointer to an interrupt vector structure
+ */
+struct airq_iv *airq_iv_create(unsigned long bits, unsigned long flags)
+{
+ struct airq_iv *iv;
+ unsigned long size;
+
+ iv = kzalloc(sizeof(*iv), GFP_KERNEL);
+ if (!iv)
+ goto out;
+ iv->bits = bits;
+ size = BITS_TO_LONGS(bits) * sizeof(unsigned long);
+ iv->vector = kzalloc(size, GFP_KERNEL);
+ if (!iv->vector)
+ goto out_free;
+ if (flags & AIRQ_IV_ALLOC) {
+ iv->avail = kmalloc(size, GFP_KERNEL);
+ if (!iv->avail)
+ goto out_free;
+ memset(iv->avail, 0xff, size);
+ iv->end = 0;
+ } else
+ iv->end = bits;
+ if (flags & AIRQ_IV_BITLOCK) {
+ iv->bitlock = kzalloc(size, GFP_KERNEL);
+ if (!iv->bitlock)
+ goto out_free;
+ }
+ if (flags & AIRQ_IV_PTR) {
+ size = bits * sizeof(unsigned long);
+ iv->ptr = kzalloc(size, GFP_KERNEL);
+ if (!iv->ptr)
+ goto out_free;
+ }
+ if (flags & AIRQ_IV_DATA) {
+ size = bits * sizeof(unsigned int);
+ iv->data = kzalloc(size, GFP_KERNEL);
+ if (!iv->data)
+ goto out_free;
+ }
+ spin_lock_init(&iv->lock);
+ return iv;
+
+out_free:
+ kfree(iv->ptr);
+ kfree(iv->bitlock);
+ kfree(iv->avail);
+ kfree(iv->vector);
+ kfree(iv);
+out:
+ return NULL;
+}
+EXPORT_SYMBOL(airq_iv_create);
+
+/**
+ * airq_iv_release - release an interrupt vector
+ * @iv: pointer to interrupt vector structure
+ */
+void airq_iv_release(struct airq_iv *iv)
+{
+ kfree(iv->data);
+ kfree(iv->ptr);
+ kfree(iv->bitlock);
+ kfree(iv->vector);
+ kfree(iv->avail);
+ kfree(iv);
+}
+EXPORT_SYMBOL(airq_iv_release);
+
+/**
+ * airq_iv_alloc_bit - allocate an irq bit from an interrupt vector
+ * @iv: pointer to an interrupt vector structure
+ *
+ * Returns the bit number of the allocated irq, or -1UL if no bit
+ * is available or the AIRQ_IV_ALLOC flag has not been specified
+ */
+unsigned long airq_iv_alloc_bit(struct airq_iv *iv)
+{
+ const unsigned long be_to_le = BITS_PER_LONG - 1;
+ unsigned long bit;
+
+ if (!iv->avail)
+ return -1UL;
+ spin_lock(&iv->lock);
+ bit = find_first_bit_left(iv->avail, iv->bits);
+ if (bit < iv->bits) {
+ clear_bit(bit ^ be_to_le, iv->avail);
+ if (bit >= iv->end)
+ iv->end = bit + 1;
+ } else
+ bit = -1UL;
+ spin_unlock(&iv->lock);
+ return bit;
+
+}
+EXPORT_SYMBOL(airq_iv_alloc_bit);
+
+/**
+ * airq_iv_free_bit - free an irq bit of an interrupt vector
+ * @iv: pointer to interrupt vector structure
+ * @bit: number of the irq bit to free
+ */
+void airq_iv_free_bit(struct airq_iv *iv, unsigned long bit)
+{
+ const unsigned long be_to_le = BITS_PER_LONG - 1;
+
+ if (!iv->avail)
+ return;
+ spin_lock(&iv->lock);
+ /* Clear (possibly left over) interrupt bit */
+ clear_bit(bit ^ be_to_le, iv->vector);
+ /* Make the bit position available again */
+ set_bit(bit ^ be_to_le, iv->avail);
+ if (bit == iv->end - 1) {
+ /* Find new end of bit-field */
+ while (--iv->end > 0)
+ if (!test_bit((iv->end - 1) ^ be_to_le, iv->avail))
+ break;
+ }
+ spin_unlock(&iv->lock);
+}
+EXPORT_SYMBOL(airq_iv_free_bit);
+
+/**
+ * airq_iv_scan - scan interrupt vector for non-zero bits
+ * @iv: pointer to interrupt vector structure
+ * @start: bit number to start the search
+ * @end: bit number to end the search
+ *
+ * Returns the bit number of the next non-zero interrupt bit, or
+ * -1UL if the scan completed without finding any more any non-zero bits.
+ */
+unsigned long airq_iv_scan(struct airq_iv *iv, unsigned long start,
+ unsigned long end)
+{
+ const unsigned long be_to_le = BITS_PER_LONG - 1;
+ unsigned long bit;
+
+ /* Find non-zero bit starting from 'ivs->next'. */
+ bit = find_next_bit_left(iv->vector, end, start);
+ if (bit >= end)
+ return -1UL;
+ /* Clear interrupt bit (find left uses big-endian bit numbers) */
+ clear_bit(bit ^ be_to_le, iv->vector);
+ return bit;
+}
+EXPORT_SYMBOL(airq_iv_scan);
