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>

1 files changed, 153 insertions, 0 deletions

diff --git a/drivers/s390/cio/airq.c b/drivers/s390/cio/airq.c
index 91edbd7ee806..6ead6d076445 100644
--- a/drivers/s390/cio/airq.c
+++ b/drivers/s390/cio/airq.c
@@ -93,3 +93,156 @@ void do_adapter_IO(u8 isc)
                         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);