dmaengine: enable mutliple clients and operations

index 1527804..3a5d353 100644
@@ -37,8 +37,13 @@
  * Each device has a channels list, which runs unlocked but is never modified
  * once the device is registered, it's just setup by the driver.
  *
- * Each client has a channels list, it's only modified under the client->lock
- * and in an RCU callback, so it's safe to read under rcu_read_lock().
+ * Each client has 'n' lists of channel references where
+ * n == DMA_MAX_CHAN_TYPE_REQ.  These lists are only modified under the
+ * client->lock and in an RCU callback, so they are safe to read under
+ * rcu_read_lock().
+ *
+ * Each channel has a list of peer clients, it's only modified under the
+ * chan->lock.  This allows a channel to be shared amongst several clients
  *
  * Each device has a kref, which is initialized to 1 when the device is
  * registered. A kref_put is done for each class_device registered.  When the

@@ -85,6 +90,18 @@ static ssize_t show_memcpy_count(struct 
 	return sprintf(buf, "%lu\n", count);
 }
 
+static ssize_t show_xor_count(struct class_device *cd, char *buf)
+{
+	struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
+	unsigned long count = 0;
+	int i;
+
+	for_each_possible_cpu(i)
+		count += per_cpu_ptr(chan->local, i)->xor_count;
+
+	return sprintf(buf, "%lu\n", count);
+}
+
 static ssize_t show_bytes_transferred(struct class_device *cd, char *buf)
 {
 	struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);

@@ -97,16 +114,37 @@ static ssize_t show_bytes_transferred(st
 	return sprintf(buf, "%lu\n", count);
 }
 
+static ssize_t show_bytes_xor(struct class_device *cd, char *buf)
+{
+	struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
+	unsigned long count = 0;
+	int i;
+
+	for_each_possible_cpu(i)
+		count += per_cpu_ptr(chan->local, i)->bytes_xor;
+
+	return sprintf(buf, "%lu\n", count);
+}
+
 static ssize_t show_in_use(struct class_device *cd, char *buf)
 {
+	unsigned int clients = 0;
+	struct list_head *peer;
 	struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
 
-	return sprintf(buf, "%d\n", (chan->client ? 1 : 0));
+	rcu_read_lock();
+	list_for_each_rcu(peer, &chan->peers)
+		clients++;
+	rcu_read_unlock();
+
+	return sprintf(buf, "%d\n", clients);
 }
 
 static struct class_device_attribute dma_class_attrs[] = {
 	__ATTR(memcpy_count, S_IRUGO, show_memcpy_count, NULL),
+	__ATTR(xor_count, S_IRUGO, show_xor_count, NULL),
 	__ATTR(bytes_transferred, S_IRUGO, show_bytes_transferred, NULL),
+	__ATTR(bytes_xor, S_IRUGO, show_bytes_xor, NULL),
 	__ATTR(in_use, S_IRUGO, show_in_use, NULL),
 	__ATTR_NULL
 };

@@ -130,34 +168,79 @@ static struct class dma_devclass = {
 /**
  * dma_client_chan_alloc - try to allocate a channel to a client
  * @client: &dma_client
+ * @req: request descriptor
  *
  * Called with dma_list_mutex held.
  */
-static struct dma_chan *dma_client_chan_alloc(struct dma_client *client)
+static struct dma_chan *dma_client_chan_alloc(struct dma_client *client,
+	struct dma_req *req)
 {
 	struct dma_device *device;
 	struct dma_chan *chan;
+	struct dma_client_chan_peer *peer;
+	struct dma_chan_client_ref *chan_ref;
 	unsigned long flags;
 	int desc;	/* allocated descriptor count */
+	int allocated;	/* flag re-allocations */
 
-	/* Find a channel, any DMA engine will do */
+	/* Find a channel */
 	list_for_each_entry(device, &dma_device_list, global_node) {
+		if ((req->cap_mask & device->capabilities)
+			!= req->cap_mask)
+			continue;
 		list_for_each_entry(chan, &device->channels, device_node) {
-			if (chan->client)
+			allocated = 0;
+			rcu_read_lock();
+			list_for_each_entry_rcu(chan_ref, &req->channels, req_node) {
+				if (chan_ref->chan == chan) {
+					allocated = 1;
+					break;
+				}
+			}
+			rcu_read_unlock();
+
+			if (allocated)
 				continue;
 
+			/* can the channel be shared between multiple clients */
+			if ((req->exclusive && !list_empty(&chan->peers)) ||
+				chan->exclusive)
+				continue;
+
+			chan_ref = kmalloc(sizeof(*chan_ref), GFP_KERNEL);
+			if (!chan_ref)
+				continue;
+
+			peer = kmalloc(sizeof(*peer), GFP_KERNEL);
+			if (!peer) {
+				kfree(chan_ref);
+				continue;
+			}
+
 			desc = chan->device->device_alloc_chan_resources(chan);
-			if (desc >= 0) {
+			if (desc) {
 				kref_get(&device->refcount);
-				kref_init(&chan->refcount);
-				chan->slow_ref = 0;
-				INIT_RCU_HEAD(&chan->rcu);
-				chan->client = client;
+				kref_get(&chan->refcount);
+				INIT_RCU_HEAD(&peer->rcu);
+				INIT_RCU_HEAD(&chan_ref->rcu);
+				INIT_LIST_HEAD(&peer->peer_node);
+				INIT_LIST_HEAD(&chan_ref->req_node);
+				peer->client = client;
+				chan_ref->chan = chan;
+
+				spin_lock_irqsave(&chan->lock, flags);
+				list_add_tail_rcu(&peer->peer_node, &chan->peers);
+				spin_unlock_irqrestore(&chan->lock, flags);
+
 				spin_lock_irqsave(&client->lock, flags);
-				list_add_tail_rcu(&chan->client_node,
-				                  &client->channels);
+				chan->exclusive = req->exclusive ? client : NULL;
+				list_add_tail_rcu(&chan_ref->req_node,
+						&req->channels);
 				spin_unlock_irqrestore(&client->lock, flags);
 				return chan;
+			} else {
+				kfree(peer);
+				kfree(chan_ref);
 			}
 		}
 	}

@@ -173,7 +256,6 @@ void dma_chan_cleanup(struct kref *kref)
 {
 	struct dma_chan *chan = container_of(kref, struct dma_chan, refcount);
 	chan->device->device_free_chan_resources(chan);
-	chan->client = NULL;
 	kref_put(&chan->device->refcount, dma_async_device_cleanup);
 }
 

@@ -186,51 +268,93 @@ static void dma_chan_free_rcu(struct rcu
 		bias -= local_read(&per_cpu_ptr(chan->local, i)->refcount);
 	atomic_sub(bias, &chan->refcount.refcount);
 	kref_put(&chan->refcount, dma_chan_cleanup);
+	kref_put(&chan->device->refcount, dma_async_device_cleanup);
+}
+
+static void dma_peer_free_rcu(struct rcu_head *rcu)
+{
+	struct dma_client_chan_peer *peer =
+		container_of(rcu, struct dma_client_chan_peer, rcu);
+
+	kfree(peer);
+}
+
+static void dma_chan_ref_free_rcu(struct rcu_head *rcu)
+{
+	struct dma_chan_client_ref *chan_ref =
+		container_of(rcu, struct dma_chan_client_ref, rcu);
+
+	kfree(chan_ref);
 }
 
-static void dma_client_chan_free(struct dma_chan *chan)
+static void dma_client_chan_free(struct dma_client *client,
+				struct dma_chan_client_ref *chan_ref)
 {
+	struct dma_client_chan_peer *peer;
+	struct dma_chan *chan = chan_ref->chan;
 	atomic_add(0x7FFFFFFF, &chan->refcount.refcount);
 	chan->slow_ref = 1;
-	call_rcu(&chan->rcu, dma_chan_free_rcu);
+	rcu_read_lock();
+	list_for_each_entry_rcu(peer, &chan->peers, peer_node)
+		if (peer->client == client) {
+			unsigned long flags;
+
+			spin_lock_irqsave(&chan->lock, flags);
+			list_del_rcu(&peer->peer_node);
+			if (list_empty(&chan->peers))
+				chan->exclusive = NULL;
+			spin_unlock_irqrestore(&chan->lock, flags);
+			call_rcu(&peer->rcu, dma_peer_free_rcu);
+			call_rcu(&chan_ref->rcu, dma_chan_ref_free_rcu);
+			call_rcu(&chan->rcu, dma_chan_free_rcu);
+			break;
+		}
+	rcu_read_unlock();
 }
 
 /**
  * dma_chans_rebalance - reallocate channels to clients
  *
- * When the number of DMA channel in the system changes,
- * channels need to be rebalanced among clients.
+ * When the number of DMA channels in the system changes,
+ * channels need to be rebalanced among clients
  */
 static void dma_chans_rebalance(void)
 {
 	struct dma_client *client;
 	struct dma_chan *chan;
+	struct dma_chan_client_ref *chan_ref;
+
 	unsigned long flags;
+	int i;
 
 	mutex_lock(&dma_list_mutex);
 
 	list_for_each_entry(client, &dma_client_list, global_node) {
-		while (client->chans_desired > client->chan_count) {
-			chan = dma_client_chan_alloc(client);
-			if (!chan)
-				break;
-			client->chan_count++;
-			client->event_callback(client,
-	                                       chan,
-	                                       DMA_RESOURCE_ADDED);
-		}
-		while (client->chans_desired < client->chan_count) {
-			spin_lock_irqsave(&client->lock, flags);
-			chan = list_entry(client->channels.next,
-			                  struct dma_chan,
-			                  client_node);
-			list_del_rcu(&chan->client_node);
-			spin_unlock_irqrestore(&client->lock, flags);
-			client->chan_count--;
-			client->event_callback(client,
-			                       chan,
-			                       DMA_RESOURCE_REMOVED);
-			dma_client_chan_free(chan);
+		for (i = 0; i < DMA_MAX_CHAN_TYPE_REQ; i++) {
+			struct dma_req *req = &client->req[i];
+			while (req->chans_desired > atomic_read(&req->chan_count)) {
+				chan = dma_client_chan_alloc(client, req);
+				if (!chan)
+					break;
+				atomic_inc(&req->chan_count);
+				client->event_callback(client,
+		                                       chan,
+		                                       DMA_RESOURCE_ADDED);
+			}
+			while (req->chans_desired < atomic_read(&req->chan_count)) {
+				spin_lock_irqsave(&client->lock, flags);
+				chan_ref = list_entry(req->channels.next,
+				                  struct dma_chan_client_ref,
+				                  req_node);
+				list_del_rcu(&chan_ref->req_node);
+				spin_unlock_irqrestore(&client->lock, flags);
+				atomic_dec(&req->chan_count);
+
+				client->event_callback(client,
+				                       chan_ref->chan,
+				                       DMA_RESOURCE_REMOVED);
+				dma_client_chan_free(client, chan_ref);
+			}
 		}
 	}
 

@@ -244,15 +368,18 @@ static void dma_chans_rebalance(void)
 struct dma_client *dma_async_client_register(dma_event_callback event_callback)
 {
 	struct dma_client *client;
+	int i;
 
 	client = kzalloc(sizeof(*client), GFP_KERNEL);
 	if (!client)
 		return NULL;
 
-	INIT_LIST_HEAD(&client->channels);
+	for (i = 0; i < DMA_MAX_CHAN_TYPE_REQ; i++) {
+		INIT_LIST_HEAD(&client->req[i].channels);
+		atomic_set(&client->req[i].chan_count, 0);
+	}
+
 	spin_lock_init(&client->lock);
-	client->chans_desired = 0;
-	client->chan_count = 0;
 	client->event_callback = event_callback;
 
 	mutex_lock(&dma_list_mutex);

@@ -270,14 +397,16 @@ struct dma_client *dma_async_client_regi
  */
 void dma_async_client_unregister(struct dma_client *client)
 {
-	struct dma_chan *chan;
+	struct dma_chan_client_ref *chan_ref;
+	int i;
 
 	if (!client)
 		return;
 
 	rcu_read_lock();
-	list_for_each_entry_rcu(chan, &client->channels, client_node)
-		dma_client_chan_free(chan);
+	for (i = 0; i < DMA_MAX_CHAN_TYPE_REQ; i++)
+		list_for_each_entry_rcu(chan_ref, &client->req[i].channels, req_node)
+			dma_client_chan_free(client, chan_ref);
 	rcu_read_unlock();
 
 	mutex_lock(&dma_list_mutex);

@@ -292,17 +421,46 @@ void dma_async_client_unregister(struct 
  * dma_async_client_chan_request - request DMA channels
  * @client: &dma_client
  * @number: count of DMA channels requested
+ * @mask: limits the DMA channels returned to those that
+ *	have the requisite capabilities
  *
  * Clients call dma_async_client_chan_request() to specify how many
  * DMA channels they need, 0 to free all currently allocated.
  * The resulting allocations/frees are indicated to the client via the
- * event callback.
+ * event callback.  If the client has exhausted the number of distinct
+ * requests allowed (DMA_MAX_CHAN_TYPE_REQ) this function will return 0.
  */
-void dma_async_client_chan_request(struct dma_client *client,
-			unsigned int number)
+int dma_async_client_chan_request(struct dma_client *client,
+			unsigned int number, unsigned int mask)
 {
-	client->chans_desired = number;
-	dma_chans_rebalance();
+	int request_slot_found = 0, i;
+
+	/* adjust an outstanding request */
+	for (i = 0; i < DMA_MAX_CHAN_TYPE_REQ; i++) {
+		struct dma_req *req = &client->req[i];
+		if (req->cap_mask == mask) {
+			req->chans_desired = number;
+			request_slot_found = 1;
+			break;
+		}
+	}
+
+	/* start a new request */
+	if (!request_slot_found)
+		for (i = 0; i < DMA_MAX_CHAN_TYPE_REQ; i++) {
+			struct dma_req *req = &client->req[i];
+			if (!req->chans_desired) {
+				req->chans_desired = number;
+				req->cap_mask = mask;
+				request_slot_found = 1;
+				break;
+			}
+		}
+
+	if (request_slot_found)
+		dma_chans_rebalance();
+
+	return request_slot_found;
 }
 
 /**

@@ -335,6 +493,7 @@ int dma_async_device_register(struct dma
 		         device->dev_id, chan->chan_id);
 
 		kref_get(&device->refcount);
+		kref_init(&chan->refcount);
 		class_device_register(&chan->class_dev);
 	}
 

@@ -348,6 +507,20 @@ int dma_async_device_register(struct dma
 }
 
 /**
+ * dma_async_chan_init - common channel initialization
+ * @chan: &dma_chan
+ * @device: &dma_device
+ */
+void dma_async_chan_init(struct dma_chan *chan, struct dma_device *device)
+{
+	INIT_LIST_HEAD(&chan->peers);
+	INIT_RCU_HEAD(&chan->rcu);
+	spin_lock_init(&chan->lock);
+	chan->device = device;
+	list_add_tail(&chan->device_node, &device->channels);
+}
+
+/**
  * dma_async_device_cleanup - function called when all references are released
  * @kref: kernel reference object
  */

@@ -366,31 +539,70 @@ static void dma_async_device_cleanup(str
 void dma_async_device_unregister(struct dma_device *device)
 {
 	struct dma_chan *chan;
+	struct dma_client_chan_peer *peer;
+	struct dma_req *req;
+	struct dma_chan_client_ref *chan_ref;
+	struct dma_client *client;
+	int i;
 	unsigned long flags;
 
 	mutex_lock(&dma_list_mutex);
 	list_del(&device->global_node);
 	mutex_unlock(&dma_list_mutex);
 
+	/* look up and free each reference to a channel
+	 * note: a channel can be allocated to a client once per
+	 * request type (DMA_MAX_CHAN_TYPE_REQ)
+	 */
 	list_for_each_entry(chan, &device->channels, device_node) {
-		if (chan->client) {
-			spin_lock_irqsave(&chan->client->lock, flags);
-			list_del(&chan->client_node);
-			chan->client->chan_count--;
-			spin_unlock_irqrestore(&chan->client->lock, flags);
-			chan->client->event_callback(chan->client,
-			                             chan,
-			                             DMA_RESOURCE_REMOVED);
-			dma_client_chan_free(chan);
+		rcu_read_lock();
+		list_for_each_entry_rcu(peer, &chan->peers, peer_node) {
+			client = peer->client;
+			for (i = 0; i < DMA_MAX_CHAN_TYPE_REQ; i++) {
+				req = &client->req[i];
+				list_for_each_entry_rcu(chan_ref,
+							&req->channels,
+							req_node) {
+					if (chan_ref->chan == chan) {
+						spin_lock_irqsave(&client->lock, flags);
+						list_del_rcu(&chan_ref->req_node);
+						spin_unlock_irqrestore(&client->lock, flags);
+						atomic_dec(&req->chan_count);
+						client->event_callback(
+						client,
+						chan,
+						DMA_RESOURCE_REMOVED);
+						dma_client_chan_free(client,
+								     chan_ref);
+						break;
+					}
+				}
+			}
 		}
-		class_device_unregister(&chan->class_dev);
+		rcu_read_unlock();
+		kref_put(&chan->refcount, dma_chan_cleanup);
+		kref_put(&device->refcount, dma_async_device_cleanup);
 	}
+
+	class_device_unregister(&chan->class_dev);
+
 	dma_chans_rebalance();
 
 	kref_put(&device->refcount, dma_async_device_cleanup);
 	wait_for_completion(&device->done);
 }
 
+/**
+ * dma_async_xor_pgs_to_pg_err - default function for dma devices that
+ *	do not support xor
+ */
+dma_cookie_t dma_async_xor_pgs_to_pg_err(struct dma_chan *chan,
+	struct page *dest_pg, unsigned int dest_off, struct page *src_pgs,
+	unsigned int src_cnt, unsigned int src_off, size_t len, u32 *result)
+{
+	return -ENXIO;
+}
+
 static int __init dma_bus_init(void)
 {
 	mutex_init(&dma_list_mutex);

@@ -405,8 +617,10 @@ EXPORT_SYMBOL(dma_async_client_chan_requ
 EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf);
 EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg);
 EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg);
-EXPORT_SYMBOL(dma_async_memcpy_complete);
-EXPORT_SYMBOL(dma_async_memcpy_issue_pending);
+EXPORT_SYMBOL(dma_async_operation_complete);
+EXPORT_SYMBOL(dma_async_issue_pending);
 EXPORT_SYMBOL(dma_async_device_register);
 EXPORT_SYMBOL(dma_async_device_unregister);
 EXPORT_SYMBOL(dma_chan_cleanup);
+EXPORT_SYMBOL(dma_async_xor_pgs_to_pg_err);
+EXPORT_SYMBOL(dma_async_chan_init);

index dbd4d6c..415de03 100644
@@ -69,11 +69,7 @@ static int enumerate_dma_channels(struct
 		spin_lock_init(&ioat_chan->desc_lock);
 		INIT_LIST_HEAD(&ioat_chan->free_desc);
 		INIT_LIST_HEAD(&ioat_chan->used_desc);
-		/* This should be made common somewhere in dmaengine.c */
-		ioat_chan->common.device = &device->common;
-		ioat_chan->common.client = NULL;
-		list_add_tail(&ioat_chan->common.device_node,
-		              &device->common.channels);
+		dma_async_chan_init(&ioat_chan->common, &device->common);
 	}
 	return device->common.chancnt;
 }

@@ -759,8 +755,10 @@ #endif
 	device->common.device_memcpy_buf_to_buf = ioat_dma_memcpy_buf_to_buf;
 	device->common.device_memcpy_buf_to_pg = ioat_dma_memcpy_buf_to_pg;
 	device->common.device_memcpy_pg_to_pg = ioat_dma_memcpy_pg_to_pg;
-	device->common.device_memcpy_complete = ioat_dma_is_complete;
-	device->common.device_memcpy_issue_pending = ioat_dma_memcpy_issue_pending;
+	device->common.device_operation_complete = ioat_dma_is_complete;
+	device->common.device_xor_pgs_to_pg = dma_async_xor_pgs_to_pg_err;
+	device->common.device_issue_pending = ioat_dma_memcpy_issue_pending;
+	device->common.capabilities = DMA_MEMCPY;
 	printk(KERN_INFO "Intel(R) I/OAT DMA Engine found, %d channels\n",
 		device->common.chancnt);
 

279 lines not on this page · raw message

index 4d2b516..a72c088 100644
@@ -1958,13 +1958,8 @@ #ifdef CONFIG_NET_DMA
 	 * There may not be any more sk_buffs coming right now, so push
 	 * any pending DMA copies to hardware
 	 */
-	if (net_dma_client) {
-		struct dma_chan *chan;
-		rcu_read_lock();
-		list_for_each_entry_rcu(chan, &net_dma_client->channels, client_node)
-			dma_async_memcpy_issue_pending(chan);
-		rcu_read_unlock();
-	}
+	if (net_dma_client)
+		dma_async_issue_all(net_dma_client);
 #endif
 	local_irq_enable();
 	return;

@@ -3427,7 +3422,8 @@ #ifdef CONFIG_NET_DMA
 static void net_dma_rebalance(void)
 {
 	unsigned int cpu, i, n;
-	struct dma_chan *chan;
+	struct dma_chan_client_ref *chan_ref;
+	struct dma_req *req;
 
 	lock_cpu_hotplug();
 

@@ -3441,13 +3437,16 @@ static void net_dma_rebalance(void)
 	i = 0;
 	cpu = first_cpu(cpu_online_map);
 
+	/* NET_DMA only requests one type of dma channel (memcpy) */
+	req = &net_dma_client->req[0];
+
 	rcu_read_lock();
-	list_for_each_entry(chan, &net_dma_client->channels, client_node) {
+	list_for_each_entry(chan_ref, &req->channels, req_node) {
 		n = ((num_online_cpus() / net_dma_count)
 		   + (i < (num_online_cpus() % net_dma_count) ? 1 : 0));
 
 		while(n) {
-			per_cpu(softnet_data.net_dma, cpu) = chan;
+			per_cpu(softnet_data.net_dma, cpu) = chan_ref->chan;
 			cpu = next_cpu(cpu, cpu_online_map);
 			n--;
 		}

@@ -3493,7 +3492,7 @@ static int __init netdev_dma_register(vo
 	if (net_dma_client == NULL)
 		return -ENOMEM;
 
-	dma_async_client_chan_request(net_dma_client, num_online_cpus());
+	dma_async_client_chan_request(net_dma_client, num_online_cpus(), DMA_MEMCPY);
 	return 0;
 }
 

index f6a2d92..51c5410 100644
@@ -1431,9 +1431,9 @@ #ifdef CONFIG_NET_DMA
 		struct sk_buff *skb;
 		dma_cookie_t done, used;
 
-		dma_async_memcpy_issue_pending(tp->ucopy.dma_chan);
+		dma_async_issue_pending(tp->ucopy.dma_chan);
 
-		while (dma_async_memcpy_complete(tp->ucopy.dma_chan,
+		while (dma_async_operation_complete(tp->ucopy.dma_chan,
 		                                 tp->ucopy.dma_cookie, &done,
 		                                 &used) == DMA_IN_PROGRESS) {
 			/* do partial cleanup of sk_async_wait_queue */

index 3a5d353..8ca4ad5 100644
@@ -593,12 +593,14 @@ void dma_async_device_unregister(struct 
 }
 
 /**
- * dma_async_xor_pgs_to_pg_err - default function for dma devices that
+ * dma_async_do_xor_err - default function for dma devices that
  *	do not support xor
  */
-dma_cookie_t dma_async_xor_pgs_to_pg_err(struct dma_chan *chan,
-	struct page *dest_pg, unsigned int dest_off, struct page *src_pgs,
-	unsigned int src_cnt, unsigned int src_off, size_t len, u32 *result)
+dma_cookie_t dma_async_do_xor_err(struct dma_chan *chan,
+		union dmaengine_addr dest, unsigned int dest_off,
+		union dmaengine_addr src, unsigned int src_cnt,
+		unsigned int src_off, size_t len, u32 *result,
+		unsigned long flags)
 {
 	return -ENXIO;
 }

@@ -622,5 +624,5 @@ EXPORT_SYMBOL(dma_async_issue_pending);
 EXPORT_SYMBOL(dma_async_device_register);
 EXPORT_SYMBOL(dma_async_device_unregister);
 EXPORT_SYMBOL(dma_chan_cleanup);
-EXPORT_SYMBOL(dma_async_xor_pgs_to_pg_err);
+EXPORT_SYMBOL(dma_async_do_xor_err);
 EXPORT_SYMBOL(dma_async_chan_init);

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index 511e8c1..c7bae96 100644
@@ -638,6 +638,37 @@ extern dma_cookie_t dma_async_do_xor_err
 	unsigned int src_off, size_t len, u32 *result,
 	unsigned long flags);
 
+static dma_addr_t ioat_map_page(struct dma_chan *chan, struct page *page,
+					unsigned long offset, size_t size,
+					int direction)
+{
+	struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+	return pci_map_page(ioat_chan->device->pdev, page, offset, size,
+			direction);
+}
+
+static dma_addr_t ioat_map_single(struct dma_chan *chan, void *cpu_addr,
+					size_t size, int direction)
+{
+	struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+	return pci_map_single(ioat_chan->device->pdev, cpu_addr, size,
+			direction);
+}
+
+static void ioat_unmap_page(struct dma_chan *chan, dma_addr_t handle,
+				size_t size, int direction)
+{
+	struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+	pci_unmap_page(ioat_chan->device->pdev, handle, size, direction);
+}
+
+static void ioat_unmap_single(struct dma_chan *chan, dma_addr_t handle,
+				size_t size, int direction)
+{
+	struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+	pci_unmap_single(ioat_chan->device->pdev, handle, size,	direction);
+}
+
 static int __devinit ioat_probe(struct pci_dev *pdev,
                                 const struct pci_device_id *ent)
 {

@@ -718,6 +749,10 @@ #endif
 	device->common.capabilities = DMA_MEMCPY;
 	device->common.device_do_dma_memcpy = do_ioat_dma_memcpy;
 	device->common.device_do_dma_xor = dma_async_do_xor_err;
+	device->common.map_page = ioat_map_page;
+	device->common.map_single = ioat_map_single;
+	device->common.unmap_page = ioat_unmap_page;
+	device->common.unmap_single = ioat_unmap_single;
 	printk(KERN_INFO "Intel(R) I/OAT DMA Engine found, %d channels\n",
 		device->common.chancnt);
 

index 7174ad5..991c438 100644
@@ -287,6 +287,15 @@ struct dma_device {
 	enum dma_status (*device_operation_complete)(struct dma_chan *chan,
 			dma_cookie_t cookie, dma_cookie_t *last,
 			dma_cookie_t *used);
+	dma_addr_t (*map_page)(struct dma_chan *chan, struct page *page,
+				unsigned long offset, size_t size,
+				int direction);
+	dma_addr_t (*map_single)(struct dma_chan *chan, void *cpu_addr,
+				size_t size, int direction);
+	void (*unmap_page)(struct dma_chan *chan, dma_addr_t handle,
+				size_t size, int direction);
+	void (*unmap_single)(struct dma_chan *chan, dma_addr_t handle,
+				size_t size, int direction);
 	void (*device_issue_pending)(struct dma_chan *chan);
 };
 

@@ -596,6 +605,31 @@ static inline enum dma_status dma_async_
 }
 
 
+static inline dma_addr_t dma_async_map_page(struct dma_chan *chan,
+			struct page *page, unsigned long offset, size_t size,
+			int direction)
+{
+	return chan->device->map_page(chan, page, offset, size, direction);
+}
+
+static inline dma_addr_t dma_async_map_single(struct dma_chan *chan,
+			void *cpu_addr,	size_t size, int direction)
+{
+	return chan->device->map_single(chan, cpu_addr, size, direction);
+}
+
+static inline void dma_async_unmap_page(struct dma_chan *chan,
+			dma_addr_t handle, size_t size, int direction)
+{
+	chan->device->unmap_page(chan, handle, size, direction);
+}
+
+static inline void dma_async_unmap_single(struct dma_chan *chan,
+			dma_addr_t handle, size_t size, int direction)
+{
+	chan->device->unmap_single(chan, handle, size, direction);
+}
+
 /* --- DMA device --- */
 
 int dma_async_device_register(struct dma_device *device);

index 8ca4ad5..ac27fd3 100644
@@ -605,6 +605,17 @@ dma_cookie_t dma_async_do_xor_err(struct
 	return -ENXIO;
 }
 
+/**
+ * dma_async_do_memset_err - default function for dma devices that
+ *      do not support memset
+ */
+dma_cookie_t dma_async_do_memset_err(struct dma_chan *chan,
+                union dmaengine_addr dest, unsigned int dest_off,
+                int val, size_t len, unsigned long flags)
+{
+        return -ENXIO;
+}
+
 static int __init dma_bus_init(void)
 {
 	mutex_init(&dma_list_mutex);

@@ -625,4 +636,5 @@ EXPORT_SYMBOL(dma_async_device_register)
 EXPORT_SYMBOL(dma_async_device_unregister);
 EXPORT_SYMBOL(dma_chan_cleanup);
 EXPORT_SYMBOL(dma_async_do_xor_err);
+EXPORT_SYMBOL(dma_async_do_memset_err);
 EXPORT_SYMBOL(dma_async_chan_init);

index c7bae96..5133e3d 100644
@@ -638,6 +638,10 @@ extern dma_cookie_t dma_async_do_xor_err
 	unsigned int src_off, size_t len, u32 *result,
 	unsigned long flags);
 
+extern dma_cookie_t dma_async_do_memset_err(struct dma_chan *chan,
+	union dmaengine_addr dest, unsigned int dest_off,
+	int val, size_t size, unsigned long flags);
+
 static dma_addr_t ioat_map_page(struct dma_chan *chan, struct page *page,
 					unsigned long offset, size_t size,
 					int direction)

@@ -749,6 +753,7 @@ #endif
 	device->common.capabilities = DMA_MEMCPY;
 	device->common.device_do_dma_memcpy = do_ioat_dma_memcpy;
 	device->common.device_do_dma_xor = dma_async_do_xor_err;
+	device->common.device_do_dma_memset = dma_async_do_memset_err;
 	device->common.map_page = ioat_map_page;
 	device->common.map_single = ioat_map_single;
 	device->common.unmap_page = ioat_unmap_page;

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