diff options
Diffstat (limited to 'drivers/ntb')
| -rw-r--r-- | drivers/ntb/ntb_transport.c | 77 |
1 files changed, 58 insertions, 19 deletions
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index f6aae0fbde48..6e3ee907d186 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -119,7 +119,8 @@ struct ntb_transport_qp { struct ntb_transport_ctx *transport; struct ntb_dev *ndev; void *cb_data; - struct dma_chan *dma_chan; + struct dma_chan *tx_dma_chan; + struct dma_chan *rx_dma_chan; bool client_ready; bool link_is_up; @@ -504,7 +505,11 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, out_offset += snprintf(buf + out_offset, out_count - out_offset, "\n"); out_offset += snprintf(buf + out_offset, out_count - out_offset, - "Using DMA - \t%s\n", use_dma ? "Yes" : "No"); + "Using TX DMA - \t%s\n", + qp->tx_dma_chan ? "Yes" : "No"); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Using RX DMA - \t%s\n", + qp->rx_dma_chan ? "Yes" : "No"); out_offset += snprintf(buf + out_offset, out_count - out_offset, "QP Link - \t%s\n", qp->link_is_up ? "Up" : "Down"); @@ -1220,7 +1225,7 @@ static void ntb_async_rx(struct ntb_queue_entry *entry, void *offset) { struct dma_async_tx_descriptor *txd; struct ntb_transport_qp *qp = entry->qp; - struct dma_chan *chan = qp->dma_chan; + struct dma_chan *chan = qp->rx_dma_chan; struct dma_device *device; size_t pay_off, buff_off, len; struct dmaengine_unmap_data *unmap; @@ -1381,8 +1386,8 @@ static void ntb_transport_rxc_db(unsigned long data) break; } - if (i && qp->dma_chan) - dma_async_issue_pending(qp->dma_chan); + if (i && qp->rx_dma_chan) + dma_async_issue_pending(qp->rx_dma_chan); if (i == qp->rx_max_entry) { /* there is more work to do */ @@ -1449,7 +1454,7 @@ static void ntb_async_tx(struct ntb_transport_qp *qp, { struct ntb_payload_header __iomem *hdr; struct dma_async_tx_descriptor *txd; - struct dma_chan *chan = qp->dma_chan; + struct dma_chan *chan = qp->tx_dma_chan; struct dma_device *device; size_t dest_off, buff_off; struct dmaengine_unmap_data *unmap; @@ -1642,14 +1647,27 @@ ntb_transport_create_queue(void *data, struct device *client_dev, dma_cap_set(DMA_MEMCPY, dma_mask); if (use_dma) { - qp->dma_chan = dma_request_channel(dma_mask, ntb_dma_filter_fn, - (void *)(unsigned long)node); - if (!qp->dma_chan) - dev_info(&pdev->dev, "Unable to allocate DMA channel\n"); + qp->tx_dma_chan = + dma_request_channel(dma_mask, ntb_dma_filter_fn, + (void *)(unsigned long)node); + if (!qp->tx_dma_chan) + dev_info(&pdev->dev, "Unable to allocate TX DMA channel\n"); + + qp->rx_dma_chan = + dma_request_channel(dma_mask, ntb_dma_filter_fn, + (void *)(unsigned long)node); + if (!qp->rx_dma_chan) + dev_info(&pdev->dev, "Unable to allocate RX DMA channel\n"); } else { - qp->dma_chan = NULL; + qp->tx_dma_chan = NULL; + qp->rx_dma_chan = NULL; } - dev_dbg(&pdev->dev, "Using %s memcpy\n", qp->dma_chan ? "DMA" : "CPU"); + + dev_dbg(&pdev->dev, "Using %s memcpy for TX\n", + qp->tx_dma_chan ? "DMA" : "CPU"); + + dev_dbg(&pdev->dev, "Using %s memcpy for RX\n", + qp->rx_dma_chan ? "DMA" : "CPU"); for (i = 0; i < NTB_QP_DEF_NUM_ENTRIES; i++) { entry = kzalloc_node(sizeof(*entry), GFP_ATOMIC, node); @@ -1684,8 +1702,10 @@ err2: err1: while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q))) kfree(entry); - if (qp->dma_chan) - dma_release_channel(qp->dma_chan); + if (qp->tx_dma_chan) + dma_release_channel(qp->tx_dma_chan); + if (qp->rx_dma_chan) + dma_release_channel(qp->rx_dma_chan); nt->qp_bitmap_free |= qp_bit; err: return NULL; @@ -1709,12 +1729,27 @@ void ntb_transport_free_queue(struct ntb_transport_qp *qp) pdev = qp->ndev->pdev; - if (qp->dma_chan) { - struct dma_chan *chan = qp->dma_chan; + if (qp->tx_dma_chan) { + struct dma_chan *chan = qp->tx_dma_chan; + /* Putting the dma_chan to NULL will force any new traffic to be + * processed by the CPU instead of the DAM engine + */ + qp->tx_dma_chan = NULL; + + /* Try to be nice and wait for any queued DMA engine + * transactions to process before smashing it with a rock + */ + dma_sync_wait(chan, qp->last_cookie); + dmaengine_terminate_all(chan); + dma_release_channel(chan); + } + + if (qp->rx_dma_chan) { + struct dma_chan *chan = qp->rx_dma_chan; /* Putting the dma_chan to NULL will force any new traffic to be * processed by the CPU instead of the DAM engine */ - qp->dma_chan = NULL; + qp->rx_dma_chan = NULL; /* Try to be nice and wait for any queued DMA engine * transactions to process before smashing it with a rock @@ -1962,16 +1997,20 @@ EXPORT_SYMBOL_GPL(ntb_transport_qp_num); unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) { unsigned int max; + unsigned int copy_align; if (!qp) return 0; - if (!qp->dma_chan) + if (!qp->tx_dma_chan && !qp->rx_dma_chan) return qp->tx_max_frame - sizeof(struct ntb_payload_header); + copy_align = max(qp->tx_dma_chan->device->copy_align, + qp->rx_dma_chan->device->copy_align); + /* If DMA engine usage is possible, try to find the max size for that */ max = qp->tx_max_frame - sizeof(struct ntb_payload_header); - max -= max % (1 << qp->dma_chan->device->copy_align); + max -= max % (1 << copy_align); return max; } |