Fix iwlan DMA mapping direction

When iwlan runs on IOMMU, IOMMU generates a lot of PTE write faults
because PTE write bit is not set on some of PTE's.  This is because
iwlan driver calls DMA mapping with PCI_DMA_TODEVICE which is read only
in mapping PTE.  But iwlan device actually writes to the mapped page to
update its contents.  This issue is not exposed in swiotlb.  But VT-d
hardware can capture this fault and stop the fault transaction.

The following patch fixes the issue.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Bhavesh Davda <bhavesh@vmware.com>
Tested-by: Chris Wright <chrisw@sous-sol.org>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index b0ee86c6268501754651206d88b87fdcfceb2401..ab13ff22a8c0852c68d525d71299115615447bc0 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -148,7 +148,7 @@ static void iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
                pci_unmap_single(dev,
                                pci_unmap_addr(&txq->cmd[index]->meta, mapping),
                                pci_unmap_len(&txq->cmd[index]->meta, len),
-                               PCI_DMA_TODEVICE);
+                               PCI_DMA_BIDIRECTIONAL);
 
        /* Unmap chunks, if any. */
        for (i = 1; i < num_tbs; i++) {
@@ -964,7 +964,7 @@ int iwl_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
         * within command buffer array. */
        txcmd_phys = pci_map_single(priv->pci_dev,
                                    out_cmd, sizeof(struct iwl_cmd),
-                                   PCI_DMA_TODEVICE);
+                                   PCI_DMA_BIDIRECTIONAL);
        pci_unmap_addr_set(&out_cmd->meta, mapping, txcmd_phys);
        pci_unmap_len_set(&out_cmd->meta, len, sizeof(struct iwl_cmd));
        /* Add buffer containing Tx command and MAC(!) header to TFD's
@@ -1115,7 +1115,7 @@ int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
                        IWL_MAX_SCAN_SIZE : sizeof(struct iwl_cmd);
 
        phys_addr = pci_map_single(priv->pci_dev, out_cmd,
-                                  len, PCI_DMA_TODEVICE);
+                                  len, PCI_DMA_BIDIRECTIONAL);
        pci_unmap_addr_set(&out_cmd->meta, mapping, phys_addr);
        pci_unmap_len_set(&out_cmd->meta, len, len);
        phys_addr += offsetof(struct iwl_cmd, hdr);
@@ -1212,7 +1212,7 @@ static void iwl_hcmd_queue_reclaim(struct iwl_priv *priv, int txq_id,
        pci_unmap_single(priv->pci_dev,
                pci_unmap_addr(&txq->cmd[cmd_idx]->meta, mapping),
                pci_unmap_len(&txq->cmd[cmd_idx]->meta, len),
-               PCI_DMA_TODEVICE);
+               PCI_DMA_BIDIRECTIONAL);
 
        for (idx = iwl_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
             q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) {