[PATCH] IB/mthca: Use dma_alloc_coherent instead of pci_alloc_consistent

Switch all allocations of coherent memory from pci_alloc_consistent() to
dma_alloc_coherent(), so that we can pass GFP_KERNEL.  This should help when
the system is low on memory.
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/infiniband/hw/mthca/mthca_cq.c

@@ -636,7 +636,7 @@ static void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq *cq)
 	int size;
 
 	if (cq->is_direct)
-		pci_free_consistent(dev->pdev,
+		dma_free_coherent(&dev->pdev->dev,
 				  (cq->ibcq.cqe + 1) * MTHCA_CQ_ENTRY_SIZE,
 				  cq->queue.direct.buf,
 				  pci_unmap_addr(&cq->queue.direct,
@@ -645,7 +645,7 @@ static void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq *cq)
 		size = (cq->ibcq.cqe + 1) * MTHCA_CQ_ENTRY_SIZE;
 		for (i = 0; i < (size + PAGE_SIZE - 1) / PAGE_SIZE; ++i)
 			if (cq->queue.page_list[i].buf)
-				pci_free_consistent(dev->pdev, PAGE_SIZE,
+				dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
 						  cq->queue.page_list[i].buf,
 						  pci_unmap_addr(&cq->queue.page_list[i],
 								 mapping));
@@ -668,8 +668,8 @@ static int mthca_alloc_cq_buf(struct mthca_dev *dev, int size,
 		npages        = 1;
 		shift         = get_order(size) + PAGE_SHIFT;
 
-		cq->queue.direct.buf = pci_alloc_consistent(dev->pdev,
-							    size, &t);
+		cq->queue.direct.buf = dma_alloc_coherent(&dev->pdev->dev,
+							  size, &t, GFP_KERNEL);
 		if (!cq->queue.direct.buf)
 			return -ENOMEM;
 
@@ -707,7 +707,8 @@ static int mthca_alloc_cq_buf(struct mthca_dev *dev, int size,
 
 		for (i = 0; i < npages; ++i) {
 			cq->queue.page_list[i].buf =
-				pci_alloc_consistent(dev->pdev, PAGE_SIZE, &t);
+				dma_alloc_coherent(&dev->pdev->dev, PAGE_SIZE,
+						   &t, GFP_KERNEL);
 			if (!cq->queue.page_list[i].buf)
 				goto err_free;
 

drivers/infiniband/hw/mthca/mthca_eq.c

@@ -501,8 +501,8 @@ static int __devinit mthca_create_eq(struct mthca_dev *dev,
 	eq_context = MAILBOX_ALIGN(mailbox);
 
 	for (i = 0; i < npages; ++i) {
-		eq->page_list[i].buf = pci_alloc_consistent(dev->pdev,
-							    PAGE_SIZE, &t);
+		eq->page_list[i].buf = dma_alloc_coherent(&dev->pdev->dev,
+							  PAGE_SIZE, &t, GFP_KERNEL);
 		if (!eq->page_list[i].buf)
 			goto err_out_free;
 
@@ -582,7 +582,7 @@ static int __devinit mthca_create_eq(struct mthca_dev *dev,
  err_out_free:
 	for (i = 0; i < npages; ++i)
 		if (eq->page_list[i].buf)
-			pci_free_consistent(dev->pdev, PAGE_SIZE,
+			dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
 					  eq->page_list[i].buf,
 					  pci_unmap_addr(&eq->page_list[i],
 							 mapping));

drivers/infiniband/hw/mthca/mthca_qp.c

@@ -934,7 +934,8 @@ static int mthca_alloc_wqe_buf(struct mthca_dev *dev,
 			mthca_dbg(dev, "Creating direct QP of size %d (shift %d)\n",
 				  size, shift);
 
-		qp->queue.direct.buf = pci_alloc_consistent(dev->pdev, size, &t);
+		qp->queue.direct.buf = dma_alloc_coherent(&dev->pdev->dev, size,
+							  &t, GFP_KERNEL);
 		if (!qp->queue.direct.buf)
 			goto err_out;
 
@@ -973,7 +974,8 @@ static int mthca_alloc_wqe_buf(struct mthca_dev *dev,
 
 		for (i = 0; i < npages; ++i) {
 			qp->queue.page_list[i].buf =
-				pci_alloc_consistent(dev->pdev, PAGE_SIZE, &t);
+				dma_alloc_coherent(&dev->pdev->dev, PAGE_SIZE,
+						   &t, GFP_KERNEL);
 			if (!qp->queue.page_list[i].buf)
 				goto err_out_free;
 
@@ -996,13 +998,12 @@ static int mthca_alloc_wqe_buf(struct mthca_dev *dev,
 
  err_out_free:
 	if (qp->is_direct) {
-		pci_free_consistent(dev->pdev, size,
-				    qp->queue.direct.buf,
+		dma_free_coherent(&dev->pdev->dev, size, qp->queue.direct.buf,
 				  pci_unmap_addr(&qp->queue.direct, mapping));
 	} else
 		for (i = 0; i < npages; ++i) {
 			if (qp->queue.page_list[i].buf)
-				pci_free_consistent(dev->pdev, PAGE_SIZE,
+				dma_free_coherent(&dev->pdev->dev, PAGE_SIZE,
 						  qp->queue.page_list[i].buf,
 						  pci_unmap_addr(&qp->queue.page_list[i],
 								 mapping));