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[1/4] ath10k: use local memory instead of shadow descriptor in ce_send

Message ID 1445526402-28522-2-git-send-email-rmanohar@qti.qualcomm.com (mailing list archive)
State Not Applicable
Delegated to: Kalle Valo
Headers show

Commit Message

Rajkumar Manoharan Oct. 22, 2015, 3:06 p.m. UTC 
Currently to avoid uncached memory access while filling up copy engine
descriptors, shadow descriptors are used. This can be optimized further
by removing shadow descriptors. To achieve that first shadow ring
dependency in ce_send is removed by creating local copy of the
descriptor on stack and make a one-shot copy into the "uncached"
descriptor.

Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
---
 drivers/net/wireless/ath/ath10k/ce.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)
diff mbox

Patch

diff --git a/drivers/net/wireless/ath/ath10k/ce.c b/drivers/net/wireless/ath/ath10k/ce.c
index 84220c3..d9fba1d 100644
--- a/drivers/net/wireless/ath/ath10k/ce.c
+++ b/drivers/net/wireless/ath/ath10k/ce.c
@@ -274,7 +274,7 @@  int ath10k_ce_send_nolock(struct ath10k_ce_pipe *ce_state,
 {
 	struct ath10k *ar = ce_state->ar;
 	struct ath10k_ce_ring *src_ring = ce_state->src_ring;
-	struct ce_desc *desc, *sdesc;
+	struct ce_desc *desc, sdesc;
 	unsigned int nentries_mask = src_ring->nentries_mask;
 	unsigned int sw_index = src_ring->sw_index;
 	unsigned int write_index = src_ring->write_index;
@@ -294,7 +294,6 @@  int ath10k_ce_send_nolock(struct ath10k_ce_pipe *ce_state,
 
 	desc = CE_SRC_RING_TO_DESC(src_ring->base_addr_owner_space,
 				   write_index);
-	sdesc = CE_SRC_RING_TO_DESC(src_ring->shadow_base, write_index);
 
 	desc_flags |= SM(transfer_id, CE_DESC_FLAGS_META_DATA);
 
@@ -303,11 +302,11 @@  int ath10k_ce_send_nolock(struct ath10k_ce_pipe *ce_state,
 	if (flags & CE_SEND_FLAG_BYTE_SWAP)
 		desc_flags |= CE_DESC_FLAGS_BYTE_SWAP;
 
-	sdesc->addr   = __cpu_to_le32(buffer);
-	sdesc->nbytes = __cpu_to_le16(nbytes);
-	sdesc->flags  = __cpu_to_le16(desc_flags);
+	sdesc.addr   = __cpu_to_le32(buffer);
+	sdesc.nbytes = __cpu_to_le16(nbytes);
+	sdesc.flags  = __cpu_to_le16(desc_flags);
 
-	*desc = *sdesc;
+	*desc = sdesc;
 
 	src_ring->per_transfer_context[write_index] = per_transfer_context;