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NTB: ntb_transport: Ensure the destination buffer is mapped for TX DMA 

Presently, when ntb_transport is used with DMA and the IOMMU turned on,
it fails with errors from the IOMMU such as:

  DMAR: DRHD: handling fault status reg 202
  DMAR: [DMA Write] Request device [00:04.0] fault addr
	381fc0340000 [fault reason 05] PTE Write access is not set

This is because ntb_transport does not map the BAR space with the IOMMU.

To fix this, we map the entire MW region for each QP after we assign
the DMA channel. This prevents needing an extra DMA map in the fast
path.

Link: https://lore.kernel.org/linux-pci/499934e7-3734-1aee-37dd-b42a5d2a2608@intel.com/
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
This commit is contained in:
Logan Gunthorpe 2019-01-18 17:10:01 -07:00 committed by Jon Mason
parent 9143595a7e
commit c59666bb32
1 changed files with 26 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/ntb/ntb_transport.c
View File

@ -144,7 +144,9 @@ struct ntb_transport_qp {
struct list_head tx_free_q;
spinlock_t ntb_tx_free_q_lock;
void __iomem *tx_mw;
dma_addr_t tx_mw_phys;
phys_addr_t tx_mw_phys;
size_t tx_mw_size;
dma_addr_t tx_mw_dma_addr;
unsigned int tx_index;
unsigned int tx_max_entry;
unsigned int tx_max_frame;
@ -1052,6 +1054,7 @@ static int ntb_transport_init_queue(struct ntb_transport_ctx *nt,
tx_size = (unsigned int)mw_size / num_qps_mw;
qp_offset = tx_size * (qp_num / mw_count);
qp->tx_mw_size = tx_size;
qp->tx_mw = nt->mw_vec[mw_num].vbase + qp_offset;
if (!qp->tx_mw)
return -EINVAL;
@ -1647,7 +1650,7 @@ static int ntb_async_tx_submit(struct ntb_transport_qp *qp,
dma_cookie_t cookie;
device = chan->device;
dest = qp->tx_mw_phys + qp->tx_max_frame * entry->tx_index;
dest = qp->tx_mw_dma_addr + qp->tx_max_frame * entry->tx_index;
buff_off = (size_t)buf & ~PAGE_MASK;
dest_off = (size_t)dest & ~PAGE_MASK;
@ -1866,6 +1869,18 @@ ntb_transport_create_queue(void *data, struct device *client_dev,
qp->rx_dma_chan = NULL;
}
if (qp->tx_dma_chan) {
qp->tx_mw_dma_addr =
dma_map_resource(qp->tx_dma_chan->device->dev,
qp->tx_mw_phys, qp->tx_mw_size,
DMA_FROM_DEVICE, 0);
if (dma_mapping_error(qp->tx_dma_chan->device->dev,
qp->tx_mw_dma_addr)) {
qp->tx_mw_dma_addr = 0;
goto err1;
}
}
dev_dbg(&pdev->dev, "Using %s memcpy for TX\n",
qp->tx_dma_chan ? "DMA" : "CPU");
@ -1907,6 +1922,10 @@ ntb_transport_create_queue(void *data, struct device *client_dev,
qp->rx_alloc_entry = 0;
while ((entry = ntb_list_rm(&qp->ntb_rx_q_lock, &qp->rx_free_q)))
kfree(entry);
if (qp->tx_mw_dma_addr)
dma_unmap_resource(qp->tx_dma_chan->device->dev,
qp->tx_mw_dma_addr, qp->tx_mw_size,
DMA_FROM_DEVICE, 0);
if (qp->tx_dma_chan)
dma_release_channel(qp->tx_dma_chan);
if (qp->rx_dma_chan)
@ -1948,6 +1967,11 @@ void ntb_transport_free_queue(struct ntb_transport_qp *qp)
*/
dma_sync_wait(chan, qp->last_cookie);
dmaengine_terminate_all(chan);
dma_unmap_resource(chan->device->dev,
qp->tx_mw_dma_addr, qp->tx_mw_size,
DMA_FROM_DEVICE, 0);
dma_release_channel(chan);
}