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ath10k: use local memory instead of shadow descriptor in ce_send 

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>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Rajkumar Manoharan 2015-10-23 18:01:03 +05:30 committed by Kalle Valo
parent 98dd2b92bb
commit b4e84c5606
1 changed files with 6 additions and 7 deletions
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13
drivers/net/wireless/ath/ath10k/ce.c
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@ -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;
@ -614,7 +613,7 @@ int ath10k_ce_completed_send_next_nolock(struct ath10k_ce_pipe *ce_state,
if (read_index == sw_index)
return -EIO;
sbase = src_ring->shadow_base;
sbase = src_ring->base_addr_owner_space;
sdesc = CE_SRC_RING_TO_DESC(sbase, sw_index);
/* Return data from completed source descriptor */