s390/qdio: add helpers to manage qdio buffers

Users of qdio buffers employ different strategies to manage these
buffers. The qeth driver uses huge contiguous buffers which leads
to high order allocations with all their downsides.

This patch provides helpers to allocate, free, and reset arrays of
qdio buffers using non contiguous pages.

Reviewed-by: Martin Peschke <mpeschke@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/drivers/s390/cio/qdio_setup.c b/drivers/s390/cio/qdio_setup.c
index f5f4a91..f76bff6 100644
--- a/drivers/s390/cio/qdio_setup.c
+++ b/drivers/s390/cio/qdio_setup.c
@@ -17,6 +17,8 @@
 #include "qdio.h"
 #include "qdio_debug.h"
 
+#define QBUFF_PER_PAGE (PAGE_SIZE / sizeof(struct qdio_buffer))
+
 static struct kmem_cache *qdio_q_cache;
 static struct kmem_cache *qdio_aob_cache;
 
@@ -32,6 +34,57 @@ void qdio_release_aob(struct qaob *aob)
 }
 EXPORT_SYMBOL_GPL(qdio_release_aob);
 
+/**
+ * qdio_free_buffers() - free qdio buffers
+ * @buf: array of pointers to qdio buffers
+ * @count: number of qdio buffers to free
+ */
+void qdio_free_buffers(struct qdio_buffer **buf, unsigned int count)
+{
+	int pos;
+
+	for (pos = 0; pos < count; pos += QBUFF_PER_PAGE)
+		free_page((unsigned long) buf[pos]);
+}
+EXPORT_SYMBOL_GPL(qdio_free_buffers);
+
+/**
+ * qdio_alloc_buffers() - allocate qdio buffers
+ * @buf: array of pointers to qdio buffers
+ * @count: number of qdio buffers to allocate
+ */
+int qdio_alloc_buffers(struct qdio_buffer **buf, unsigned int count)
+{
+	int pos;
+
+	for (pos = 0; pos < count; pos += QBUFF_PER_PAGE) {
+		buf[pos] = (void *) get_zeroed_page(GFP_KERNEL);
+		if (!buf[pos]) {
+			qdio_free_buffers(buf, count);
+			return -ENOMEM;
+		}
+	}
+	for (pos = 0; pos < count; pos++)
+		if (pos % QBUFF_PER_PAGE)
+			buf[pos] = buf[pos - 1] + 1;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(qdio_alloc_buffers);
+
+/**
+ * qdio_reset_buffers() - reset qdio buffers
+ * @buf: array of pointers to qdio buffers
+ * @count: number of qdio buffers that will be zeroed
+ */
+void qdio_reset_buffers(struct qdio_buffer **buf, unsigned int count)
+{
+	int pos;
+
+	for (pos = 0; pos < count; pos++)
+		memset(buf[pos], 0, sizeof(struct qdio_buffer));
+}
+EXPORT_SYMBOL_GPL(qdio_reset_buffers);
+
 /*
  * qebsm is only available under 64bit but the adapter sets the feature
  * flag anyway, so we manually override it.