dmaengine: idxd: Export descriptor management functions

To allow idxd sub-drivers to access the descriptor management
functions, export them.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/dma/idxd/submit.c

@@ -61,6 +61,7 @@ struct idxd_desc *idxd_alloc_desc(struct idxd_wq *wq, enum idxd_op_type optype)
 
 	return __get_desc(wq, idx, cpu);
 }
+EXPORT_SYMBOL_NS_GPL(idxd_alloc_desc, IDXD);
 
 void idxd_free_desc(struct idxd_wq *wq, struct idxd_desc *desc)
 {
@@ -69,6 +70,7 @@ void idxd_free_desc(struct idxd_wq *wq, struct idxd_desc *desc)
 	desc->cpu = -1;
 	sbitmap_queue_clear(&wq->sbq, desc->id, cpu);
 }
+EXPORT_SYMBOL_NS_GPL(idxd_free_desc, IDXD);
 
 static struct idxd_desc *list_abort_desc(struct idxd_wq *wq, struct idxd_irq_entry *ie,
 					 struct idxd_desc *desc)
@@ -215,3 +217,4 @@ int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
 	percpu_ref_put(&wq->wq_active);
 	return 0;
 }
+EXPORT_SYMBOL_NS_GPL(idxd_submit_desc, IDXD);