1 files changed, 92 insertions, 81 deletions

diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index c44f5517edbd..15906027c8de 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -46,9 +46,12 @@
 /* internal functions */
 static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan);
 static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan);
+static struct ioat_desc_sw *
+ioat_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan);
 
-static struct ioat_dma_chan *ioat_lookup_chan_by_index(struct ioatdma_device *device,
-						       int index)
+static inline struct ioat_dma_chan *ioat_lookup_chan_by_index(
+						struct ioatdma_device *device,
+						int index)
 {
 	return device->idx[index];
 }
@@ -148,57 +151,90 @@ static void ioat_set_src(dma_addr_t addr,
 			 struct dma_async_tx_descriptor *tx,
 			 int index)
 {
-	struct ioat_desc_sw *iter, *desc = tx_to_ioat_desc(tx);
-	struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan);
-
-	pci_unmap_addr_set(desc, src, addr);
-
-	list_for_each_entry(iter, &desc->async_tx.tx_list, node) {
-		iter->hw->src_addr = addr;
-		addr += ioat_chan->xfercap;
-	}
-
+	tx_to_ioat_desc(tx)->src = addr;
 }
 
 static void ioat_set_dest(dma_addr_t addr,
 			  struct dma_async_tx_descriptor *tx,
 			  int index)
 {
-	struct ioat_desc_sw *iter, *desc = tx_to_ioat_desc(tx);
-	struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan);
-
-	pci_unmap_addr_set(desc, dst, addr);
-
-	list_for_each_entry(iter, &desc->async_tx.tx_list, node) {
-		iter->hw->dst_addr = addr;
-		addr += ioat_chan->xfercap;
-	}
+	tx_to_ioat_desc(tx)->dst = addr;
 }
 
 static dma_cookie_t ioat_tx_submit(struct dma_async_tx_descriptor *tx)
 {
 	struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan);
-	struct ioat_desc_sw *desc = tx_to_ioat_desc(tx);
+	struct ioat_desc_sw *first = tx_to_ioat_desc(tx);
+	struct ioat_desc_sw *prev, *new;
+	struct ioat_dma_descriptor *hw;
 	int append = 0;
 	dma_cookie_t cookie;
-	struct ioat_desc_sw *group_start;
+	LIST_HEAD(new_chain);
+	u32 copy;
+	size_t len;
+	dma_addr_t src, dst;
+	int orig_ack;
+	unsigned int desc_count = 0;
+
+	/* src and dest and len are stored in the initial descriptor */
+	len = first->len;
+	src = first->src;
+	dst = first->dst;
+	orig_ack = first->async_tx.ack;
+	new = first;
 
-	group_start = list_entry(desc->async_tx.tx_list.next,
-				 struct ioat_desc_sw, node);
 	spin_lock_bh(&ioat_chan->desc_lock);
+	prev = to_ioat_desc(ioat_chan->used_desc.prev);
+	prefetch(prev->hw);
+	do {
+		copy = min((u32) len, ioat_chan->xfercap);
+
+		new->async_tx.ack = 1;
+
+		hw = new->hw;
+		hw->size = copy;
+		hw->ctl = 0;
+		hw->src_addr = src;
+		hw->dst_addr = dst;
+		hw->next = 0;
+
+		/* chain together the physical address list for the HW */
+		wmb();
+		prev->hw->next = (u64) new->async_tx.phys;
+
+		len -= copy;
+		dst += copy;
+		src += copy;
+
+		list_add_tail(&new->node, &new_chain);
+		desc_count++;
+		prev = new;
+	} while (len && (new = ioat_dma_get_next_descriptor(ioat_chan)));
+
+	hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
+	new->tx_cnt = desc_count;
+	new->async_tx.ack = orig_ack; /* client is in control of this ack */
+
+	/* store the original values for use in later cleanup */
+	if (new != first) {
+		new->src = first->src;
+		new->dst = first->dst;
+		new->len = first->len;
+	}
+
 	/* cookie incr and addition to used_list must be atomic */
 	cookie = ioat_chan->common.cookie;
 	cookie++;
 	if (cookie < 0)
 		cookie = 1;
-	ioat_chan->common.cookie = desc->async_tx.cookie = cookie;
+	ioat_chan->common.cookie = new->async_tx.cookie = cookie;
 
 	/* write address into NextDescriptor field of last desc in chain */
 	to_ioat_desc(ioat_chan->used_desc.prev)->hw->next =
-						group_start->async_tx.phys;
-	list_splice_init(&desc->async_tx.tx_list, ioat_chan->used_desc.prev);
+							first->async_tx.phys;
+	__list_splice(&new_chain, ioat_chan->used_desc.prev);
 
-	ioat_chan->pending += desc->tx_cnt;
+	ioat_chan->pending += desc_count;
 	if (ioat_chan->pending >= 4) {
 		append = 1;
 		ioat_chan->pending = 0;
@@ -348,6 +384,7 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan)
 	ioat_chan->last_completion = ioat_chan->completion_addr = 0;
 	ioat_chan->pending = 0;
 }
+
 /**
  * ioat_dma_get_next_descriptor - return the next available descriptor
  * @ioat_chan: IOAT DMA channel handle
@@ -356,8 +393,8 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan)
  * channel's desc_lock held.  Allocates more descriptors if the channel
  * has run out.
  */
-static struct ioat_desc_sw *ioat_dma_get_next_descriptor(
-						struct ioat_dma_chan *ioat_chan)
+static struct ioat_desc_sw *
+ioat_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
 {
 	struct ioat_desc_sw *new = NULL;
 
@@ -382,51 +419,11 @@ static struct dma_async_tx_descriptor *ioat_dma_prep_memcpy(
 						int int_en)
 {
 	struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
-	struct ioat_desc_sw *first, *prev, *new;
-	LIST_HEAD(new_chain);
-	u32 copy;
-	size_t orig_len;
-	int desc_count = 0;
-
-	if (!len)
-		return NULL;
-
-	orig_len = len;
-
-	first = NULL;
-	prev = NULL;
+	struct ioat_desc_sw *new;
 
 	spin_lock_bh(&ioat_chan->desc_lock);
-	while (len) {
-		new = ioat_dma_get_next_descriptor(ioat_chan);
-		copy = min((u32) len, ioat_chan->xfercap);
-
-		new->hw->size = copy;
-		new->hw->ctl = 0;
-		new->async_tx.cookie = 0;
-		new->async_tx.ack = 1;
-
-		/* chain together the physical address list for the HW */
-		if (!first)
-			first = new;
-		else
-			prev->hw->next = (u64) new->async_tx.phys;
-
-		prev = new;
-		len  -= copy;
-		list_add_tail(&new->node, &new_chain);
-		desc_count++;
-	}
-
-	list_splice(&new_chain, &new->async_tx.tx_list);
-
-	new->hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
-	new->hw->next = 0;
-	new->tx_cnt = desc_count;
-	new->async_tx.ack = 0; /* client is in control of this ack */
-	new->async_tx.cookie = -EBUSY;
-
-	pci_unmap_len_set(new, len, orig_len);
+	new = ioat_dma_get_next_descriptor(ioat_chan);
+	new->len = len;
 	spin_unlock_bh(&ioat_chan->desc_lock);
 
 	return new ? &new->async_tx : NULL;
@@ -464,7 +461,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan)
 
 	prefetch(ioat_chan->completion_virt);
 
-	if (!spin_trylock(&ioat_chan->cleanup_lock))
+	if (!spin_trylock_bh(&ioat_chan->cleanup_lock))
 		return;
 
 	/* The completion writeback can happen at any time,
@@ -474,12 +471,15 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan)
 
 #if (BITS_PER_LONG == 64)
 	phys_complete =
-	ioat_chan->completion_virt->full & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
+		ioat_chan->completion_virt->full
+		& IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
 #else
-	phys_complete = ioat_chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK;
+	phys_complete =
+		ioat_chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK;
 #endif
 
-	if ((ioat_chan->completion_virt->full & IOAT_CHANSTS_DMA_TRANSFER_STATUS) ==
+	if ((ioat_chan->completion_virt->full
+		& IOAT_CHANSTS_DMA_TRANSFER_STATUS) ==
 				IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) {
 		dev_err(&ioat_chan->device->pdev->dev,
 			"Channel halted, chanerr = %x\n",
@@ -489,7 +489,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan)
 	}
 
 	if (phys_complete == ioat_chan->last_completion) {
-		spin_unlock(&ioat_chan->cleanup_lock);
+		spin_unlock_bh(&ioat_chan->cleanup_lock);
 		return;
 	}
 
@@ -548,7 +548,7 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan)
 	if (cookie != 0)
 		ioat_chan->completed_cookie = cookie;
 
-	spin_unlock(&ioat_chan->cleanup_lock);
+	spin_unlock_bh(&ioat_chan->cleanup_lock);
 }
 
 static void ioat_dma_dependency_added(struct dma_chan *chan)
@@ -613,8 +613,13 @@ static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
 	spin_lock_bh(&ioat_chan->desc_lock);
 
 	desc = ioat_dma_get_next_descriptor(ioat_chan);
-	desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL;
+	desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL
+				| IOAT_DMA_DESCRIPTOR_CTL_INT_GN
+				| IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
 	desc->hw->next = 0;
+	desc->hw->size = 0;
+	desc->hw->src_addr = 0;
+	desc->hw->dst_addr = 0;
 	desc->async_tx.ack = 1;
 
 	list_add_tail(&desc->node, &ioat_chan->used_desc);
@@ -688,6 +693,12 @@ static int ioat_dma_self_test(struct ioatdma_device *device)
 			DMA_FROM_DEVICE);
 	ioat_set_dest(addr, tx, 0);
 	cookie = ioat_tx_submit(tx);
+	if (cookie < 0) {
+		dev_err(&device->pdev->dev,
+			"Self-test setup failed, disabling\n");
+		err = -ENODEV;
+		goto free_resources;
+	}
 	ioat_dma_memcpy_issue_pending(dma_chan);
 	msleep(1);