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ntb: add DMA error handling for TX DMA

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Adding support on the tx DMA path to allow recovery of errors when
DMA responds with error status and abort all the subsequent ops.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Allen Hubbe <Allen.Hubbe@emc.com>
Cc: Jon Mason <jdmason@kudzu.us>
Cc: linux-ntb@googlegroups.com
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Dave Jiang 2016-07-20 13:14:07 -07:00 committed by Vinod Koul
parent aed681d1dc
commit 9cabc2691e
1 changed files with 83 additions and 27 deletions
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110
drivers/ntb/ntb_transport.c
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@ -102,6 +102,9 @@ struct ntb_queue_entry {
void *buf;
unsigned int len;
unsigned int flags;
int retries;
int errors;
unsigned int tx_index;
struct ntb_transport_qp *qp;
union {
@ -259,6 +262,9 @@ enum {
static void ntb_transport_rxc_db(unsigned long data);
static const struct ntb_ctx_ops ntb_transport_ops;
static struct ntb_client ntb_transport_client;
static int ntb_async_tx_submit(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry);
static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset);
static int ntb_transport_bus_match(struct device *dev,
struct device_driver *drv)
@ -1467,12 +1473,39 @@ static void ntb_transport_rxc_db(unsigned long data)
}
}
static void ntb_tx_copy_callback(void *data)
static void ntb_tx_copy_callback(void *data,
const struct dmaengine_result *res)
{
struct ntb_queue_entry *entry = data;
struct ntb_transport_qp *qp = entry->qp;
struct ntb_payload_header __iomem *hdr = entry->tx_hdr;
/* we need to check DMA results if we are using DMA */
if (res) {
enum dmaengine_tx_result dma_err = res->result;
switch (dma_err) {
case DMA_TRANS_READ_FAILED:
case DMA_TRANS_WRITE_FAILED:
entry->errors++;
case DMA_TRANS_ABORTED:
{
void __iomem *offset =
qp->tx_mw + qp->tx_max_frame *
entry->tx_index;
/* resubmit via CPU */
ntb_memcpy_tx(entry, offset);
qp->tx_memcpy++;
return;
}
case DMA_TRANS_NOERROR:
default:
break;
}
}
iowrite32(entry->flags | DESC_DONE_FLAG, &hdr->flags);
ntb_peer_db_set(qp->ndev, BIT_ULL(qp->qp_num));
@ -1507,40 +1540,25 @@ static void ntb_memcpy_tx(struct ntb_queue_entry *entry, void __iomem *offset)
/* Ensure that the data is fully copied out before setting the flags */
wmb();
ntb_tx_copy_callback(entry);
ntb_tx_copy_callback(entry, NULL);
}
static void ntb_async_tx(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry)
static int ntb_async_tx_submit(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry)
{
struct ntb_payload_header __iomem *hdr;
struct dma_async_tx_descriptor *txd;
struct dma_chan *chan = qp->tx_dma_chan;
struct dma_device *device;
size_t len = entry->len;
void *buf = entry->buf;
size_t dest_off, buff_off;
struct dmaengine_unmap_data *unmap;
dma_addr_t dest;
dma_cookie_t cookie;
void __iomem *offset;
size_t len = entry->len;
void *buf = entry->buf;
int retries = 0;
offset = qp->tx_mw + qp->tx_max_frame * qp->tx_index;
hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header);
entry->tx_hdr = hdr;
iowrite32(entry->len, &hdr->len);
iowrite32((u32)qp->tx_pkts, &hdr->ver);
if (!chan)
goto err;
if (len < copy_bytes)
goto err;
device = chan->device;
dest = qp->tx_mw_phys + qp->tx_max_frame * qp->tx_index;
dest = qp->tx_mw_phys + qp->tx_max_frame * entry->tx_index;
buff_off = (size_t)buf & ~PAGE_MASK;
dest_off = (size_t)dest & ~PAGE_MASK;
@ -1560,8 +1578,9 @@ static void ntb_async_tx(struct ntb_transport_qp *qp,
unmap->to_cnt = 1;
for (retries = 0; retries < DMA_RETRIES; retries++) {
txd = device->device_prep_dma_memcpy(chan, dest, unmap->addr[0],
len, DMA_PREP_INTERRUPT);
txd = device->device_prep_dma_memcpy(chan, dest,
unmap->addr[0], len,
DMA_PREP_INTERRUPT);
if (txd)
break;
@ -1574,7 +1593,7 @@ static void ntb_async_tx(struct ntb_transport_qp *qp,
goto err_get_unmap;
}
txd->callback = ntb_tx_copy_callback;
txd->callback_result = ntb_tx_copy_callback;
txd->callback_param = entry;
dma_set_unmap(txd, unmap);
@ -1585,13 +1604,47 @@ static void ntb_async_tx(struct ntb_transport_qp *qp,
dmaengine_unmap_put(unmap);
dma_async_issue_pending(chan);
qp->tx_async++;
return;
return 0;
err_set_unmap:
dmaengine_unmap_put(unmap);
err_get_unmap:
dmaengine_unmap_put(unmap);
err:
return -ENXIO;
}
static void ntb_async_tx(struct ntb_transport_qp *qp,
struct ntb_queue_entry *entry)
{
struct ntb_payload_header __iomem *hdr;
struct dma_chan *chan = qp->tx_dma_chan;
void __iomem *offset;
int res;
entry->tx_index = qp->tx_index;
offset = qp->tx_mw + qp->tx_max_frame * entry->tx_index;
hdr = offset + qp->tx_max_frame - sizeof(struct ntb_payload_header);
entry->tx_hdr = hdr;
iowrite32(entry->len, &hdr->len);
iowrite32((u32)qp->tx_pkts, &hdr->ver);
if (!chan)
goto err;
if (entry->len < copy_bytes)
goto err;
res = ntb_async_tx_submit(qp, entry);
if (res < 0)
goto err;
if (!entry->retries)
qp->tx_async++;
return;
err:
ntb_memcpy_tx(entry, offset);
qp->tx_memcpy++;
@ -1970,6 +2023,9 @@ int ntb_transport_tx_enqueue(struct ntb_transport_qp *qp, void *cb, void *data,
entry->buf = data;
entry->len = len;
entry->flags = 0;
entry->errors = 0;
entry->retries = 0;
entry->tx_index = 0;
rc = ntb_process_tx(qp, entry);
if (rc)