@@ -132,6 +132,15 @@ struct cpdma_chan {
u32 rate;
};
+struct submit_info {
+ struct cpdma_chan *chan;
+ int directed;
+ void *token;
+ void *data;
+ int flags;
+ int len;
+};
+
struct cpdma_control_info {
u32 reg;
u32 shift, mask;
@@ -183,6 +192,8 @@ static struct cpdma_control_info controls[] = {
(directed << CPDMA_TO_PORT_SHIFT)); \
} while (0)
+#define CPDMA_DMA_EXT_MAP BIT(16)
+
static void cpdma_desc_pool_destroy(struct cpdma_ctlr *ctlr)
{
struct cpdma_desc_pool *pool = ctlr->pool;
@@ -1026,10 +1037,11 @@ static void __cpdma_chan_submit(struct cpdma_chan *chan,
}
}
-int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
- int len, int directed)
+static int cpdma_chan_submit_si(struct submit_info *si)
{
+ struct cpdma_chan *chan = si->chan;
struct cpdma_ctlr *ctlr = chan->ctlr;
+ int len = si->len;
struct cpdma_desc __iomem *desc;
dma_addr_t buffer;
unsigned long flags;
@@ -1061,16 +1073,22 @@ int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
chan->stats.runt_transmit_buff++;
}
- buffer = dma_map_single(ctlr->dev, data, len, chan->dir);
- ret = dma_mapping_error(ctlr->dev, buffer);
- if (ret) {
- cpdma_desc_free(ctlr->pool, desc, 1);
- ret = -EINVAL;
- goto unlock_ret;
- }
-
mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
- cpdma_desc_to_port(chan, mode, directed);
+ cpdma_desc_to_port(chan, mode, si->directed);
+
+ if (si->flags & CPDMA_DMA_EXT_MAP) {
+ buffer = (dma_addr_t)si->data;
+ dma_sync_single_for_device(ctlr->dev, buffer, len, chan->dir);
+ len |= CPDMA_DMA_EXT_MAP;
+ } else {
+ buffer = dma_map_single(ctlr->dev, si->data, len, chan->dir);
+ ret = dma_mapping_error(ctlr->dev, buffer);
+ if (ret) {
+ cpdma_desc_free(ctlr->pool, desc, 1);
+ ret = -EINVAL;
+ goto unlock_ret;
+ }
+ }
/* Relaxed IO accessors can be used here as there is read barrier
* at the end of write sequence.
@@ -1079,7 +1097,7 @@ int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
writel_relaxed(buffer, &desc->hw_buffer);
writel_relaxed(len, &desc->hw_len);
writel_relaxed(mode | len, &desc->hw_mode);
- writel_relaxed((uintptr_t)token, &desc->sw_token);
+ writel_relaxed((uintptr_t)si->token, &desc->sw_token);
writel_relaxed(buffer, &desc->sw_buffer);
writel_relaxed(len, &desc->sw_len);
desc_read(desc, sw_len);
@@ -1095,8 +1113,39 @@ int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
spin_unlock_irqrestore(&chan->lock, flags);
return ret;
}
+
+int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data, int len,
+ int directed)
+{
+ struct submit_info si;
+
+ si.chan = chan;
+ si.token = token;
+ si.data = data;
+ si.len = len;
+ si.directed = directed;
+ si.flags = 0;
+
+ return cpdma_chan_submit_si(&si);
+}
EXPORT_SYMBOL_GPL(cpdma_chan_submit);
+int cpdma_chan_submit_mapped(struct cpdma_chan *chan, void *token, void *data,
+ int len, int directed)
+{
+ struct submit_info si;
+
+ si.chan = chan;
+ si.token = token;
+ si.data = data;
+ si.len = len;
+ si.directed = directed;
+ si.flags = CPDMA_DMA_EXT_MAP;
+
+ return cpdma_chan_submit_si(&si);
+}
+EXPORT_SYMBOL_GPL(cpdma_chan_submit_mapped);
+
bool cpdma_check_free_tx_desc(struct cpdma_chan *chan)
{
struct cpdma_ctlr *ctlr = chan->ctlr;
@@ -1123,10 +1172,17 @@ static void __cpdma_chan_free(struct cpdma_chan *chan,
uintptr_t token;
token = desc_read(desc, sw_token);
- buff_dma = desc_read(desc, sw_buffer);
origlen = desc_read(desc, sw_len);
- dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir);
+ buff_dma = desc_read(desc, sw_buffer);
+ if (origlen & CPDMA_DMA_EXT_MAP) {
+ origlen &= ~CPDMA_DMA_EXT_MAP;
+ dma_sync_single_for_cpu(ctlr->dev, buff_dma, origlen,
+ chan->dir);
+ } else {
+ dma_unmap_single(ctlr->dev, buff_dma, origlen, chan->dir);
+ }
+
cpdma_desc_free(pool, desc, 1);
(*chan->handler)((void *)token, outlen, status);
}
@@ -84,6 +84,8 @@ int cpdma_chan_stop(struct cpdma_chan *chan);
int cpdma_chan_get_stats(struct cpdma_chan *chan,
struct cpdma_chan_stats *stats);
+int cpdma_chan_submit_mapped(struct cpdma_chan *chan, void *token, void *data,
+ int len, int directed);
int cpdma_chan_submit(struct cpdma_chan *chan, void *token, void *data,
int len, int directed);
int cpdma_chan_process(struct cpdma_chan *chan, int quota);
In case if dma mapped packet needs to be sent, like with XDP page pool, the "mapped" submit can be used. This patch adds dma mapped submit based on regular one. Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> --- drivers/net/ethernet/ti/davinci_cpdma.c | 84 ++++++++++++++++++++----- drivers/net/ethernet/ti/davinci_cpdma.h | 2 + 2 files changed, 72 insertions(+), 14 deletions(-)