ath10k: remove shadow copy of CE descriptors for source ring

For the messages from host to target, shadow copy of CE descriptors
are maintained in source ring. Before writing actual CE descriptor,
first shadow copy is filled and then it is copied to CE address space.
To optimize in download path and to reduce d-cache pressure, removing
shadow copy of CE descriptors. This will also reduce driver memory
consumption by 33KB during on device probing.

Signed-off-by: Rajkumar Manoharan <rmanohar@qti.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath10k/ce.c

@@ -921,27 +921,6 @@ ath10k_ce_alloc_src_ring(struct ath10k *ar, unsigned int ce_id,
 			src_ring->base_addr_ce_space_unaligned,
 			CE_DESC_RING_ALIGN);
 
-	/*
-	 * Also allocate a shadow src ring in regular
-	 * mem to use for faster access.
-	 */
-	src_ring->shadow_base_unaligned =
-		kmalloc((nentries * sizeof(struct ce_desc) +
-			 CE_DESC_RING_ALIGN), GFP_KERNEL);
-	if (!src_ring->shadow_base_unaligned) {
-		dma_free_coherent(ar->dev,
-				  (nentries * sizeof(struct ce_desc) +
-				   CE_DESC_RING_ALIGN),
-				  src_ring->base_addr_owner_space,
-				  src_ring->base_addr_ce_space);
-		kfree(src_ring);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	src_ring->shadow_base = PTR_ALIGN(
-			src_ring->shadow_base_unaligned,
-			CE_DESC_RING_ALIGN);
-
 	return src_ring;
 }
 
@@ -1120,7 +1099,6 @@ void ath10k_ce_free_pipe(struct ath10k *ar, int ce_id)
 	struct ath10k_ce_pipe *ce_state = &ar_pci->ce_states[ce_id];
 
 	if (ce_state->src_ring) {
-		kfree(ce_state->src_ring->shadow_base_unaligned);
 		dma_free_coherent(ar->dev,
 				  (ce_state->src_ring->nentries *
 				   sizeof(struct ce_desc) +

drivers/net/wireless/ath/ath10k/ce.h

@@ -100,12 +100,6 @@ struct ath10k_ce_ring {
 
 	/* CE address space */
 	u32 base_addr_ce_space;
-	/*
-	 * Start of shadow copy of descriptors, within regular memory.
-	 * Aligned to descriptor-size boundary.
-	 */
-	void *shadow_base_unaligned;
-	struct ce_desc *shadow_base;
 
 	/* keep last */
 	void *per_transfer_context[0];

drivers/net/wireless/ath/ath10k/pci.c

@@ -1594,7 +1594,6 @@ static void ath10k_pci_tx_pipe_cleanup(struct ath10k_pci_pipe *pci_pipe)
 	struct ath10k_pci *ar_pci;
 	struct ath10k_ce_pipe *ce_pipe;
 	struct ath10k_ce_ring *ce_ring;
-	struct ce_desc *ce_desc;
 	struct sk_buff *skb;
 	int i;
 
@@ -1609,10 +1608,6 @@ static void ath10k_pci_tx_pipe_cleanup(struct ath10k_pci_pipe *pci_pipe)
 	if (!pci_pipe->buf_sz)
 		return;
 
-	ce_desc = ce_ring->shadow_base;
-	if (WARN_ON(!ce_desc))
-		return;
-
 	for (i = 0; i < ce_ring->nentries; i++) {
 		skb = ce_ring->per_transfer_context[i];
 		if (!skb)