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From:   Kalle Valo <kvalo@kernel.org>
To:     linux-wireless@vger.kernel.org
Cc:     ath12k@lists.infradead.org
Subject: [PATCH v2 03/50] wifi: ath12k: add ce.c
Date:   Wed, 16 Nov 2022 18:38:15 +0200
Message-Id: <20221116163902.24996-4-kvalo@kernel.org>
In-Reply-To: <20221116163902.24996-1-kvalo@kernel.org>
References: <20221116163902.24996-1-kvalo@kernel.org>
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From: Kalle Valo <quic_kvalo@quicinc.com>

(Patches split into one patch per file for easier review, but the final
commit will be one big patch. See the cover letter for more info.)

Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
---
 drivers/net/wireless/ath/ath12k/ce.c | 964 +++++++++++++++++++++++++++++++++++
 1 file changed, 964 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/ce.c b/drivers/net/wireless/ath/ath12k/ce.c
new file mode 100644
index 000000000000..aed6987804bf
--- /dev/null
+++ b/drivers/net/wireless/ath/ath12k/ce.c
@@ -0,0 +1,964 @@
+// SPDX-License-Identifier: BSD-3-Clause-Clear
+/*
+ * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include "dp_rx.h"
+#include "debug.h"
+#include "hif.h"
+
+const struct ce_attr ath12k_host_ce_config_qcn9274[] = {
+	/* CE0: host->target HTC control and raw streams */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 16,
+		.src_sz_max = 2048,
+		.dest_nentries = 0,
+	},
+
+	/* CE1: target->host HTT + HTC control */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 0,
+		.src_sz_max = 2048,
+		.dest_nentries = 512,
+		.recv_cb = ath12k_htc_rx_completion_handler,
+	},
+
+	/* CE2: target->host WMI */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 0,
+		.src_sz_max = 2048,
+		.dest_nentries = 128,
+		.recv_cb = ath12k_htc_rx_completion_handler,
+	},
+
+	/* CE3: host->target WMI (mac0) */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 32,
+		.src_sz_max = 2048,
+		.dest_nentries = 0,
+	},
+
+	/* CE4: host->target HTT */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 2048,
+		.src_sz_max = 256,
+		.dest_nentries = 0,
+	},
+
+	/* CE5: target->host pktlog */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 0,
+		.src_sz_max = 2048,
+		.dest_nentries = 512,
+		.recv_cb = ath12k_dp_htt_htc_t2h_msg_handler,
+	},
+
+	/* CE6: target autonomous hif_memcpy */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE7: host->target WMI (mac1) */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 32,
+		.src_sz_max = 2048,
+		.dest_nentries = 0,
+	},
+
+	/* CE8: target autonomous hif_memcpy */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE9: MHI */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE10: MHI */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE11: MHI */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE12: CV Prefetch */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE13: CV Prefetch */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE14: target->host dbg log */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 0,
+		.src_sz_max = 2048,
+		.dest_nentries = 512,
+		.recv_cb = ath12k_htc_rx_completion_handler,
+	},
+
+	/* CE15: reserved for future use */
+	{
+		.flags = (CE_ATTR_FLAGS | CE_ATTR_DIS_INTR),
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+};
+
+const struct ce_attr ath12k_host_ce_config_wcn7850[] = {
+	/* CE0: host->target HTC control and raw streams */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 16,
+		.src_sz_max = 2048,
+		.dest_nentries = 0,
+	},
+
+	/* CE1: target->host HTT + HTC control */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 0,
+		.src_sz_max = 2048,
+		.dest_nentries = 512,
+		.recv_cb = ath12k_htc_rx_completion_handler,
+	},
+
+	/* CE2: target->host WMI */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 0,
+		.src_sz_max = 2048,
+		.dest_nentries = 64,
+		.recv_cb = ath12k_htc_rx_completion_handler,
+	},
+
+	/* CE3: host->target WMI (mac0) */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 32,
+		.src_sz_max = 2048,
+		.dest_nentries = 0,
+	},
+
+	/* CE4: host->target HTT */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 2048,
+		.src_sz_max = 256,
+		.dest_nentries = 0,
+	},
+
+	/* CE5: target->host pktlog */
+	{
+		.flags = CE_ATTR_FLAGS,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE6: target autonomous hif_memcpy */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+	/* CE7: host->target WMI (mac1) */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 2048,
+		.dest_nentries = 0,
+	},
+
+	/* CE8: target autonomous hif_memcpy */
+	{
+		.flags = CE_ATTR_FLAGS | CE_ATTR_DIS_INTR,
+		.src_nentries = 0,
+		.src_sz_max = 0,
+		.dest_nentries = 0,
+	},
+
+};
+
+static int ath12k_ce_rx_buf_enqueue_pipe(struct ath12k_ce_pipe *pipe,
+					 struct sk_buff *skb, dma_addr_t paddr)
+{
+	struct ath12k_base *ab = pipe->ab;
+	struct ath12k_ce_ring *ring = pipe->dest_ring;
+	struct hal_srng *srng;
+	unsigned int write_index;
+	unsigned int nentries_mask = ring->nentries_mask;
+	struct hal_ce_srng_dest_desc *desc;
+	int ret;
+
+	lockdep_assert_held(&ab->ce.ce_lock);
+
+	write_index = ring->write_index;
+
+	srng = &ab->hal.srng_list[ring->hal_ring_id];
+
+	spin_lock_bh(&srng->lock);
+
+	ath12k_hal_srng_access_begin(ab, srng);
+
+	if (unlikely(ath12k_hal_srng_src_num_free(ab, srng, false) < 1)) {
+		ret = -ENOSPC;
+		goto exit;
+	}
+
+	desc = ath12k_hal_srng_src_get_next_entry(ab, srng);
+	if (!desc) {
+		ret = -ENOSPC;
+		goto exit;
+	}
+
+	ath12k_hal_ce_dst_set_desc(desc, paddr);
+
+	ring->skb[write_index] = skb;
+	write_index = CE_RING_IDX_INCR(nentries_mask, write_index);
+	ring->write_index = write_index;
+
+	pipe->rx_buf_needed--;
+
+	ret = 0;
+exit:
+	ath12k_hal_srng_access_end(ab, srng);
+
+	spin_unlock_bh(&srng->lock);
+
+	return ret;
+}
+
+static int ath12k_ce_rx_post_pipe(struct ath12k_ce_pipe *pipe)
+{
+	struct ath12k_base *ab = pipe->ab;
+	struct sk_buff *skb;
+	dma_addr_t paddr;
+	int ret = 0;
+
+	if (!(pipe->dest_ring || pipe->status_ring))
+		return 0;
+
+	spin_lock_bh(&ab->ce.ce_lock);
+	while (pipe->rx_buf_needed) {
+		skb = dev_alloc_skb(pipe->buf_sz);
+		if (!skb) {
+			ret = -ENOMEM;
+			goto exit;
+		}
+
+		WARN_ON_ONCE(!IS_ALIGNED((unsigned long)skb->data, 4));
+
+		paddr = dma_map_single(ab->dev, skb->data,
+				       skb->len + skb_tailroom(skb),
+				       DMA_FROM_DEVICE);
+		if (unlikely(dma_mapping_error(ab->dev, paddr))) {
+			ath12k_warn(ab, "failed to dma map ce rx buf\n");
+			dev_kfree_skb_any(skb);
+			ret = -EIO;
+			goto exit;
+		}
+
+		ATH12K_SKB_RXCB(skb)->paddr = paddr;
+
+		ret = ath12k_ce_rx_buf_enqueue_pipe(pipe, skb, paddr);
+		if (ret) {
+			ath12k_warn(ab, "failed to enqueue rx buf: %d\n", ret);
+			dma_unmap_single(ab->dev, paddr,
+					 skb->len + skb_tailroom(skb),
+					 DMA_FROM_DEVICE);
+			dev_kfree_skb_any(skb);
+			goto exit;
+		}
+	}
+
+exit:
+	spin_unlock_bh(&ab->ce.ce_lock);
+	return ret;
+}
+
+static int ath12k_ce_completed_recv_next(struct ath12k_ce_pipe *pipe,
+					 struct sk_buff **skb, int *nbytes)
+{
+	struct ath12k_base *ab = pipe->ab;
+	struct hal_ce_srng_dst_status_desc *desc;
+	struct hal_srng *srng;
+	unsigned int sw_index;
+	unsigned int nentries_mask;
+	int ret = 0;
+
+	spin_lock_bh(&ab->ce.ce_lock);
+
+	sw_index = pipe->dest_ring->sw_index;
+	nentries_mask = pipe->dest_ring->nentries_mask;
+
+	srng = &ab->hal.srng_list[pipe->status_ring->hal_ring_id];
+
+	spin_lock_bh(&srng->lock);
+
+	ath12k_hal_srng_access_begin(ab, srng);
+
+	desc = ath12k_hal_srng_dst_get_next_entry(ab, srng);
+	if (!desc) {
+		ret = -EIO;
+		goto err;
+	}
+
+	*nbytes = ath12k_hal_ce_dst_status_get_length(desc);
+	if (*nbytes == 0) {
+		ret = -EIO;
+		goto err;
+	}
+
+	*skb = pipe->dest_ring->skb[sw_index];
+	pipe->dest_ring->skb[sw_index] = NULL;
+
+	sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
+	pipe->dest_ring->sw_index = sw_index;
+
+	pipe->rx_buf_needed++;
+err:
+	ath12k_hal_srng_access_end(ab, srng);
+
+	spin_unlock_bh(&srng->lock);
+
+	spin_unlock_bh(&ab->ce.ce_lock);
+
+	return ret;
+}
+
+static void ath12k_ce_recv_process_cb(struct ath12k_ce_pipe *pipe)
+{
+	struct ath12k_base *ab = pipe->ab;
+	struct sk_buff *skb;
+	struct sk_buff_head list;
+	unsigned int nbytes, max_nbytes;
+	int ret;
+
+	__skb_queue_head_init(&list);
+	while (ath12k_ce_completed_recv_next(pipe, &skb, &nbytes) == 0) {
+		max_nbytes = skb->len + skb_tailroom(skb);
+		dma_unmap_single(ab->dev, ATH12K_SKB_RXCB(skb)->paddr,
+				 max_nbytes, DMA_FROM_DEVICE);
+
+		if (unlikely(max_nbytes < nbytes)) {
+			ath12k_warn(ab, "rxed more than expected (nbytes %d, max %d)",
+				    nbytes, max_nbytes);
+			dev_kfree_skb_any(skb);
+			continue;
+		}
+
+		skb_put(skb, nbytes);
+		__skb_queue_tail(&list, skb);
+	}
+
+	while ((skb = __skb_dequeue(&list))) {
+		ath12k_dbg(ab, ATH12K_DBG_AHB, "rx ce pipe %d len %d\n",
+			   pipe->pipe_num, skb->len);
+		pipe->recv_cb(ab, skb);
+	}
+
+	ret = ath12k_ce_rx_post_pipe(pipe);
+	if (ret && ret != -ENOSPC) {
+		ath12k_warn(ab, "failed to post rx buf to pipe: %d err: %d\n",
+			    pipe->pipe_num, ret);
+		mod_timer(&ab->rx_replenish_retry,
+			  jiffies + ATH12K_CE_RX_POST_RETRY_JIFFIES);
+	}
+}
+
+static struct sk_buff *ath12k_ce_completed_send_next(struct ath12k_ce_pipe *pipe)
+{
+	struct ath12k_base *ab = pipe->ab;
+	struct hal_ce_srng_src_desc *desc;
+	struct hal_srng *srng;
+	unsigned int sw_index;
+	unsigned int nentries_mask;
+	struct sk_buff *skb;
+
+	spin_lock_bh(&ab->ce.ce_lock);
+
+	sw_index = pipe->src_ring->sw_index;
+	nentries_mask = pipe->src_ring->nentries_mask;
+
+	srng = &ab->hal.srng_list[pipe->src_ring->hal_ring_id];
+
+	spin_lock_bh(&srng->lock);
+
+	ath12k_hal_srng_access_begin(ab, srng);
+
+	desc = ath12k_hal_srng_src_reap_next(ab, srng);
+	if (!desc) {
+		skb = ERR_PTR(-EIO);
+		goto err_unlock;
+	}
+
+	skb = pipe->src_ring->skb[sw_index];
+
+	pipe->src_ring->skb[sw_index] = NULL;
+
+	sw_index = CE_RING_IDX_INCR(nentries_mask, sw_index);
+	pipe->src_ring->sw_index = sw_index;
+
+err_unlock:
+	spin_unlock_bh(&srng->lock);
+
+	spin_unlock_bh(&ab->ce.ce_lock);
+
+	return skb;
+}
+
+static void ath12k_ce_send_done_cb(struct ath12k_ce_pipe *pipe)
+{
+	struct ath12k_base *ab = pipe->ab;
+	struct sk_buff *skb;
+
+	while (!IS_ERR(skb = ath12k_ce_completed_send_next(pipe))) {
+		if (!skb)
+			continue;
+
+		dma_unmap_single(ab->dev, ATH12K_SKB_CB(skb)->paddr, skb->len,
+				 DMA_TO_DEVICE);
+		dev_kfree_skb_any(skb);
+	}
+}
+
+static void ath12k_ce_srng_msi_ring_params_setup(struct ath12k_base *ab, u32 ce_id,
+						 struct hal_srng_params *ring_params)
+{
+	u32 msi_data_start;
+	u32 msi_data_count, msi_data_idx;
+	u32 msi_irq_start;
+	u32 addr_lo;
+	u32 addr_hi;
+	int ret;
+
+	ret = ath12k_hif_get_user_msi_vector(ab, "CE",
+					     &msi_data_count, &msi_data_start,
+					     &msi_irq_start);
+
+	if (ret)
+		return;
+
+	ath12k_hif_get_msi_address(ab, &addr_lo, &addr_hi);
+	ath12k_hif_get_ce_msi_idx(ab, ce_id, &msi_data_idx);
+
+	ring_params->msi_addr = addr_lo;
+	ring_params->msi_addr |= (dma_addr_t)(((uint64_t)addr_hi) << 32);
+	ring_params->msi_data = (msi_data_idx % msi_data_count) + msi_data_start;
+	ring_params->flags |= HAL_SRNG_FLAGS_MSI_INTR;
+}
+
+static int ath12k_ce_init_ring(struct ath12k_base *ab,
+			       struct ath12k_ce_ring *ce_ring,
+			       int ce_id, enum hal_ring_type type)
+{
+	struct hal_srng_params params = { 0 };
+	int ret;
+
+	params.ring_base_paddr = ce_ring->base_addr_ce_space;
+	params.ring_base_vaddr = ce_ring->base_addr_owner_space;
+	params.num_entries = ce_ring->nentries;
+
+	if (!(CE_ATTR_DIS_INTR & ab->hw_params->host_ce_config[ce_id].flags))
+		ath12k_ce_srng_msi_ring_params_setup(ab, ce_id, &params);
+
+	switch (type) {
+	case HAL_CE_SRC:
+		if (!(CE_ATTR_DIS_INTR & ab->hw_params->host_ce_config[ce_id].flags))
+			params.intr_batch_cntr_thres_entries = 1;
+		break;
+	case HAL_CE_DST:
+		params.max_buffer_len = ab->hw_params->host_ce_config[ce_id].src_sz_max;
+		if (!(ab->hw_params->host_ce_config[ce_id].flags & CE_ATTR_DIS_INTR)) {
+			params.intr_timer_thres_us = 1024;
+			params.flags |= HAL_SRNG_FLAGS_LOW_THRESH_INTR_EN;
+			params.low_threshold = ce_ring->nentries - 3;
+		}
+		break;
+	case HAL_CE_DST_STATUS:
+		if (!(ab->hw_params->host_ce_config[ce_id].flags & CE_ATTR_DIS_INTR)) {
+			params.intr_batch_cntr_thres_entries = 1;
+			params.intr_timer_thres_us = 0x1000;
+		}
+		break;
+	default:
+		ath12k_warn(ab, "Invalid CE ring type %d\n", type);
+		return -EINVAL;
+	}
+
+	/* TODO: Init other params needed by HAL to init the ring */
+
+	ret = ath12k_hal_srng_setup(ab, type, ce_id, 0, &params);
+	if (ret < 0) {
+		ath12k_warn(ab, "failed to setup srng: %d ring_id %d\n",
+			    ret, ce_id);
+		return ret;
+	}
+
+	ce_ring->hal_ring_id = ret;
+
+	return 0;
+}
+
+static struct ath12k_ce_ring *
+ath12k_ce_alloc_ring(struct ath12k_base *ab, int nentries, int desc_sz)
+{
+	struct ath12k_ce_ring *ce_ring;
+	dma_addr_t base_addr;
+
+	ce_ring = kzalloc(struct_size(ce_ring, skb, nentries), GFP_KERNEL);
+	if (!ce_ring)
+		return ERR_PTR(-ENOMEM);
+
+	ce_ring->nentries = nentries;
+	ce_ring->nentries_mask = nentries - 1;
+
+	/* Legacy platforms that do not support cache
+	 * coherent DMA are unsupported
+	 */
+	ce_ring->base_addr_owner_space_unaligned =
+		dma_alloc_coherent(ab->dev,
+				   nentries * desc_sz + CE_DESC_RING_ALIGN,
+				   &base_addr, GFP_KERNEL);
+	if (!ce_ring->base_addr_owner_space_unaligned) {
+		kfree(ce_ring);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	ce_ring->base_addr_ce_space_unaligned = base_addr;
+
+	ce_ring->base_addr_owner_space =
+		PTR_ALIGN(ce_ring->base_addr_owner_space_unaligned,
+			  CE_DESC_RING_ALIGN);
+
+	ce_ring->base_addr_ce_space = ALIGN(ce_ring->base_addr_ce_space_unaligned,
+					    CE_DESC_RING_ALIGN);
+
+	return ce_ring;
+}
+
+static int ath12k_ce_alloc_pipe(struct ath12k_base *ab, int ce_id)
+{
+	struct ath12k_ce_pipe *pipe = &ab->ce.ce_pipe[ce_id];
+	const struct ce_attr *attr = &ab->hw_params->host_ce_config[ce_id];
+	struct ath12k_ce_ring *ring;
+	int nentries;
+	int desc_sz;
+
+	pipe->attr_flags = attr->flags;
+
+	if (attr->src_nentries) {
+		pipe->send_cb = ath12k_ce_send_done_cb;
+		nentries = roundup_pow_of_two(attr->src_nentries);
+		desc_sz = ath12k_hal_ce_get_desc_size(HAL_CE_DESC_SRC);
+		ring = ath12k_ce_alloc_ring(ab, nentries, desc_sz);
+		if (IS_ERR(ring))
+			return PTR_ERR(ring);
+		pipe->src_ring = ring;
+	}
+
+	if (attr->dest_nentries) {
+		pipe->recv_cb = attr->recv_cb;
+		nentries = roundup_pow_of_two(attr->dest_nentries);
+		desc_sz = ath12k_hal_ce_get_desc_size(HAL_CE_DESC_DST);
+		ring = ath12k_ce_alloc_ring(ab, nentries, desc_sz);
+		if (IS_ERR(ring))
+			return PTR_ERR(ring);
+		pipe->dest_ring = ring;
+
+		desc_sz = ath12k_hal_ce_get_desc_size(HAL_CE_DESC_DST_STATUS);
+		ring = ath12k_ce_alloc_ring(ab, nentries, desc_sz);
+		if (IS_ERR(ring))
+			return PTR_ERR(ring);
+		pipe->status_ring = ring;
+	}
+
+	return 0;
+}
+
+void ath12k_ce_per_engine_service(struct ath12k_base *ab, u16 ce_id)
+{
+	struct ath12k_ce_pipe *pipe = &ab->ce.ce_pipe[ce_id];
+
+	if (pipe->send_cb)
+		pipe->send_cb(pipe);
+
+	if (pipe->recv_cb)
+		ath12k_ce_recv_process_cb(pipe);
+}
+
+void ath12k_ce_poll_send_completed(struct ath12k_base *ab, u8 pipe_id)
+{
+	struct ath12k_ce_pipe *pipe = &ab->ce.ce_pipe[pipe_id];
+
+	if ((pipe->attr_flags & CE_ATTR_DIS_INTR) && pipe->send_cb)
+		pipe->send_cb(pipe);
+}
+
+int ath12k_ce_send(struct ath12k_base *ab, struct sk_buff *skb, u8 pipe_id,
+		   u16 transfer_id)
+{
+	struct ath12k_ce_pipe *pipe = &ab->ce.ce_pipe[pipe_id];
+	struct hal_ce_srng_src_desc *desc;
+	struct hal_srng *srng;
+	unsigned int write_index, sw_index;
+	unsigned int nentries_mask;
+	int ret = 0;
+	u8 byte_swap_data = 0;
+	int num_used;
+
+	/* Check if some entries could be regained by handling tx completion if
+	 * the CE has interrupts disabled and the used entries is more than the
+	 * defined usage threshold.
+	 */
+	if (pipe->attr_flags & CE_ATTR_DIS_INTR) {
+		spin_lock_bh(&ab->ce.ce_lock);
+		write_index = pipe->src_ring->write_index;
+
+		sw_index = pipe->src_ring->sw_index;
+
+		if (write_index >= sw_index)
+			num_used = write_index - sw_index;
+		else
+			num_used = pipe->src_ring->nentries - sw_index +
+				   write_index;
+
+		spin_unlock_bh(&ab->ce.ce_lock);
+
+		if (num_used > ATH12K_CE_USAGE_THRESHOLD)
+			ath12k_ce_poll_send_completed(ab, pipe->pipe_num);
+	}
+
+	if (test_bit(ATH12K_FLAG_CRASH_FLUSH, &ab->dev_flags))
+		return -ESHUTDOWN;
+
+	spin_lock_bh(&ab->ce.ce_lock);
+
+	write_index = pipe->src_ring->write_index;
+	nentries_mask = pipe->src_ring->nentries_mask;
+
+	srng = &ab->hal.srng_list[pipe->src_ring->hal_ring_id];
+
+	spin_lock_bh(&srng->lock);
+
+	ath12k_hal_srng_access_begin(ab, srng);
+
+	if (unlikely(ath12k_hal_srng_src_num_free(ab, srng, false) < 1)) {
+		ath12k_hal_srng_access_end(ab, srng);
+		ret = -ENOBUFS;
+		goto unlock;
+	}
+
+	desc = ath12k_hal_srng_src_get_next_reaped(ab, srng);
+	if (!desc) {
+		ath12k_hal_srng_access_end(ab, srng);
+		ret = -ENOBUFS;
+		goto unlock;
+	}
+
+	if (pipe->attr_flags & CE_ATTR_BYTE_SWAP_DATA)
+		byte_swap_data = 1;
+
+	ath12k_hal_ce_src_set_desc(desc, ATH12K_SKB_CB(skb)->paddr,
+				   skb->len, transfer_id, byte_swap_data);
+
+	pipe->src_ring->skb[write_index] = skb;
+	pipe->src_ring->write_index = CE_RING_IDX_INCR(nentries_mask,
+						       write_index);
+
+	ath12k_hal_srng_access_end(ab, srng);
+
+unlock:
+	spin_unlock_bh(&srng->lock);
+
+	spin_unlock_bh(&ab->ce.ce_lock);
+
+	return ret;
+}
+
+static void ath12k_ce_rx_pipe_cleanup(struct ath12k_ce_pipe *pipe)
+{
+	struct ath12k_base *ab = pipe->ab;
+	struct ath12k_ce_ring *ring = pipe->dest_ring;
+	struct sk_buff *skb;
+	int i;
+
+	if (!(ring && pipe->buf_sz))
+		return;
+
+	for (i = 0; i < ring->nentries; i++) {
+		skb = ring->skb[i];
+		if (!skb)
+			continue;
+
+		ring->skb[i] = NULL;
+		dma_unmap_single(ab->dev, ATH12K_SKB_RXCB(skb)->paddr,
+				 skb->len + skb_tailroom(skb), DMA_FROM_DEVICE);
+		dev_kfree_skb_any(skb);
+	}
+}
+
+void ath12k_ce_cleanup_pipes(struct ath12k_base *ab)
+{
+	struct ath12k_ce_pipe *pipe;
+	int pipe_num;
+
+	for (pipe_num = 0; pipe_num < ab->hw_params->ce_count; pipe_num++) {
+		pipe = &ab->ce.ce_pipe[pipe_num];
+		ath12k_ce_rx_pipe_cleanup(pipe);
+
+		/* Cleanup any src CE's which have interrupts disabled */
+		ath12k_ce_poll_send_completed(ab, pipe_num);
+
+		/* NOTE: Should we also clean up tx buffer in all pipes? */
+	}
+}
+
+void ath12k_ce_rx_post_buf(struct ath12k_base *ab)
+{
+	struct ath12k_ce_pipe *pipe;
+	int i;
+	int ret;
+
+	for (i = 0; i < ab->hw_params->ce_count; i++) {
+		pipe = &ab->ce.ce_pipe[i];
+		ret = ath12k_ce_rx_post_pipe(pipe);
+		if (ret) {
+			if (ret == -ENOSPC)
+				continue;
+
+			ath12k_warn(ab, "failed to post rx buf to pipe: %d err: %d\n",
+				    i, ret);
+			mod_timer(&ab->rx_replenish_retry,
+				  jiffies + ATH12K_CE_RX_POST_RETRY_JIFFIES);
+
+			return;
+		}
+	}
+}
+
+void ath12k_ce_rx_replenish_retry(struct timer_list *t)
+{
+	struct ath12k_base *ab = from_timer(ab, t, rx_replenish_retry);
+
+	ath12k_ce_rx_post_buf(ab);
+}
+
+static void ath12k_ce_shadow_config(struct ath12k_base *ab)
+{
+	int i;
+
+	for (i = 0; i < ab->hw_params->ce_count; i++) {
+		if (ab->hw_params->host_ce_config[i].src_nentries)
+			ath12k_hal_srng_update_shadow_config(ab, HAL_CE_SRC, i);
+
+		if (ab->hw_params->host_ce_config[i].dest_nentries) {
+			ath12k_hal_srng_update_shadow_config(ab, HAL_CE_DST, i);
+			ath12k_hal_srng_update_shadow_config(ab, HAL_CE_DST_STATUS, i);
+		}
+	}
+}
+
+void ath12k_ce_get_shadow_config(struct ath12k_base *ab,
+				 u32 **shadow_cfg, u32 *shadow_cfg_len)
+{
+	if (!ab->hw_params->supports_shadow_regs)
+		return;
+
+	ath12k_hal_srng_get_shadow_config(ab, shadow_cfg, shadow_cfg_len);
+
+	/* shadow is already configured */
+	if (*shadow_cfg_len)
+		return;
+
+	/* shadow isn't configured yet, configure now.
+	 * non-CE srngs are configured firstly, then
+	 * all CE srngs.
+	 */
+	ath12k_hal_srng_shadow_config(ab);
+	ath12k_ce_shadow_config(ab);
+
+	/* get the shadow configuration */
+	ath12k_hal_srng_get_shadow_config(ab, shadow_cfg, shadow_cfg_len);
+}
+
+int ath12k_ce_init_pipes(struct ath12k_base *ab)
+{
+	struct ath12k_ce_pipe *pipe;
+	int i;
+	int ret;
+
+	ath12k_ce_get_shadow_config(ab, &ab->qmi.ce_cfg.shadow_reg_v3,
+				    &ab->qmi.ce_cfg.shadow_reg_v3_len);
+
+	for (i = 0; i < ab->hw_params->ce_count; i++) {
+		pipe = &ab->ce.ce_pipe[i];
+
+		if (pipe->src_ring) {
+			ret = ath12k_ce_init_ring(ab, pipe->src_ring, i,
+						  HAL_CE_SRC);
+			if (ret) {
+				ath12k_warn(ab, "failed to init src ring: %d\n",
+					    ret);
+				/* Should we clear any partial init */
+				return ret;
+			}
+
+			pipe->src_ring->write_index = 0;
+			pipe->src_ring->sw_index = 0;
+		}
+
+		if (pipe->dest_ring) {
+			ret = ath12k_ce_init_ring(ab, pipe->dest_ring, i,
+						  HAL_CE_DST);
+			if (ret) {
+				ath12k_warn(ab, "failed to init dest ring: %d\n",
+					    ret);
+				/* Should we clear any partial init */
+				return ret;
+			}
+
+			pipe->rx_buf_needed = pipe->dest_ring->nentries ?
+					      pipe->dest_ring->nentries - 2 : 0;
+
+			pipe->dest_ring->write_index = 0;
+			pipe->dest_ring->sw_index = 0;
+		}
+
+		if (pipe->status_ring) {
+			ret = ath12k_ce_init_ring(ab, pipe->status_ring, i,
+						  HAL_CE_DST_STATUS);
+			if (ret) {
+				ath12k_warn(ab, "failed to init dest status ing: %d\n",
+					    ret);
+				/* Should we clear any partial init */
+				return ret;
+			}
+
+			pipe->status_ring->write_index = 0;
+			pipe->status_ring->sw_index = 0;
+		}
+	}
+
+	return 0;
+}
+
+void ath12k_ce_free_pipes(struct ath12k_base *ab)
+{
+	struct ath12k_ce_pipe *pipe;
+	int desc_sz;
+	int i;
+
+	for (i = 0; i < ab->hw_params->ce_count; i++) {
+		pipe = &ab->ce.ce_pipe[i];
+
+		if (pipe->src_ring) {
+			desc_sz = ath12k_hal_ce_get_desc_size(HAL_CE_DESC_SRC);
+			dma_free_coherent(ab->dev,
+					  pipe->src_ring->nentries * desc_sz +
+					  CE_DESC_RING_ALIGN,
+					  pipe->src_ring->base_addr_owner_space,
+					  pipe->src_ring->base_addr_ce_space);
+			kfree(pipe->src_ring);
+			pipe->src_ring = NULL;
+		}
+
+		if (pipe->dest_ring) {
+			desc_sz = ath12k_hal_ce_get_desc_size(HAL_CE_DESC_DST);
+			dma_free_coherent(ab->dev,
+					  pipe->dest_ring->nentries * desc_sz +
+					  CE_DESC_RING_ALIGN,
+					  pipe->dest_ring->base_addr_owner_space,
+					  pipe->dest_ring->base_addr_ce_space);
+			kfree(pipe->dest_ring);
+			pipe->dest_ring = NULL;
+		}
+
+		if (pipe->status_ring) {
+			desc_sz =
+			  ath12k_hal_ce_get_desc_size(HAL_CE_DESC_DST_STATUS);
+			dma_free_coherent(ab->dev,
+					  pipe->status_ring->nentries * desc_sz +
+					  CE_DESC_RING_ALIGN,
+					  pipe->status_ring->base_addr_owner_space,
+					  pipe->status_ring->base_addr_ce_space);
+			kfree(pipe->status_ring);
+			pipe->status_ring = NULL;
+		}
+	}
+}
+
+int ath12k_ce_alloc_pipes(struct ath12k_base *ab)
+{
+	struct ath12k_ce_pipe *pipe;
+	int i;
+	int ret;
+	const struct ce_attr *attr;
+
+	spin_lock_init(&ab->ce.ce_lock);
+
+	for (i = 0; i < ab->hw_params->ce_count; i++) {
+		attr = &ab->hw_params->host_ce_config[i];
+		pipe = &ab->ce.ce_pipe[i];
+		pipe->pipe_num = i;
+		pipe->ab = ab;
+		pipe->buf_sz = attr->src_sz_max;
+
+		ret = ath12k_ce_alloc_pipe(ab, i);
+		if (ret) {
+			/* Free any parial successful allocation */
+			ath12k_ce_free_pipes(ab);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+int ath12k_ce_get_attr_flags(struct ath12k_base *ab, int ce_id)
+{
+	if (ce_id >= ab->hw_params->ce_count)
+		return -EINVAL;
+
+	return ab->hw_params->host_ce_config[ce_id].flags;
+}