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From:   Kalle Valo <kvalo@kernel.org>
To:     linux-wireless@vger.kernel.org
Cc:     ath12k@lists.infradead.org
Subject: [PATCH v2 07/50] wifi: ath12k: add dbring.c
Date:   Wed, 16 Nov 2022 18:38:19 +0200
Message-Id: <20221116163902.24996-8-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/dbring.c | 357 +++++++++++++++++++++++++++++++
 1 file changed, 357 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/dbring.c b/drivers/net/wireless/ath/ath12k/dbring.c
new file mode 100644
index 000000000000..9aa2631be1a8
--- /dev/null
+++ b/drivers/net/wireless/ath/ath12k/dbring.c
@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: BSD-3-Clause-Clear
+/*
+ * Copyright (c) 2019-2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include "core.h"
+#include "debug.h"
+
+static int ath12k_dbring_bufs_replenish(struct ath12k *ar,
+					struct ath12k_dbring *ring,
+					struct ath12k_dbring_element *buff,
+					gfp_t gfp)
+{
+	struct ath12k_base *ab = ar->ab;
+	struct hal_srng *srng;
+	dma_addr_t paddr;
+	void *ptr_aligned, *ptr_unaligned, *desc;
+	int ret;
+	int buf_id;
+	u32 cookie;
+
+	srng = &ab->hal.srng_list[ring->refill_srng.ring_id];
+
+	lockdep_assert_held(&srng->lock);
+
+	ath12k_hal_srng_access_begin(ab, srng);
+
+	ptr_unaligned = buff->payload;
+	ptr_aligned = PTR_ALIGN(ptr_unaligned, ring->buf_align);
+	paddr = dma_map_single(ab->dev, ptr_aligned, ring->buf_sz,
+			       DMA_FROM_DEVICE);
+
+	ret = dma_mapping_error(ab->dev, paddr);
+	if (ret)
+		goto err;
+
+	spin_lock_bh(&ring->idr_lock);
+	buf_id = idr_alloc(&ring->bufs_idr, buff, 0, ring->bufs_max, gfp);
+	spin_unlock_bh(&ring->idr_lock);
+	if (buf_id < 0) {
+		ret = -ENOBUFS;
+		goto err_dma_unmap;
+	}
+
+	desc = ath12k_hal_srng_src_get_next_entry(ab, srng);
+	if (!desc) {
+		ret = -ENOENT;
+		goto err_idr_remove;
+	}
+
+	buff->paddr = paddr;
+
+	cookie = u32_encode_bits(ar->pdev_idx, DP_RXDMA_BUF_COOKIE_PDEV_ID) |
+		 u32_encode_bits(buf_id, DP_RXDMA_BUF_COOKIE_BUF_ID);
+
+	ath12k_hal_rx_buf_addr_info_set(desc, paddr, cookie, 0);
+
+	ath12k_hal_srng_access_end(ab, srng);
+
+	return 0;
+
+err_idr_remove:
+	spin_lock_bh(&ring->idr_lock);
+	idr_remove(&ring->bufs_idr, buf_id);
+	spin_unlock_bh(&ring->idr_lock);
+err_dma_unmap:
+	dma_unmap_single(ab->dev, paddr, ring->buf_sz,
+			 DMA_FROM_DEVICE);
+err:
+	ath12k_hal_srng_access_end(ab, srng);
+	return ret;
+}
+
+static int ath12k_dbring_fill_bufs(struct ath12k *ar,
+				   struct ath12k_dbring *ring,
+				   gfp_t gfp)
+{
+	struct ath12k_dbring_element *buff;
+	struct hal_srng *srng;
+	struct ath12k_base *ab = ar->ab;
+	int num_remain, req_entries, num_free;
+	u32 align;
+	int size, ret;
+
+	srng = &ab->hal.srng_list[ring->refill_srng.ring_id];
+
+	spin_lock_bh(&srng->lock);
+
+	num_free = ath12k_hal_srng_src_num_free(ab, srng, true);
+	req_entries = min(num_free, ring->bufs_max);
+	num_remain = req_entries;
+	align = ring->buf_align;
+	size = sizeof(*buff) + ring->buf_sz + align - 1;
+
+	while (num_remain > 0) {
+		buff = kzalloc(size, gfp);
+		if (!buff)
+			break;
+
+		ret = ath12k_dbring_bufs_replenish(ar, ring, buff, gfp);
+		if (ret) {
+			ath12k_warn(ab, "failed to replenish db ring num_remain %d req_ent %d\n",
+				    num_remain, req_entries);
+			kfree(buff);
+			break;
+		}
+		num_remain--;
+	}
+
+	spin_unlock_bh(&srng->lock);
+
+	return num_remain;
+}
+
+int ath12k_dbring_wmi_cfg_setup(struct ath12k *ar,
+				struct ath12k_dbring *ring,
+				enum wmi_direct_buffer_module id)
+{
+	struct ath12k_wmi_pdev_dma_ring_cfg_arg arg = {0};
+	int ret;
+
+	if (id >= WMI_DIRECT_BUF_MAX)
+		return -EINVAL;
+
+	arg.pdev_id = DP_SW2HW_MACID(ring->pdev_id);
+	arg.module_id = id;
+	arg.base_paddr_lo = lower_32_bits(ring->refill_srng.paddr);
+	arg.base_paddr_hi = upper_32_bits(ring->refill_srng.paddr);
+	arg.head_idx_paddr_lo = lower_32_bits(ring->hp_addr);
+	arg.head_idx_paddr_hi = upper_32_bits(ring->hp_addr);
+	arg.tail_idx_paddr_lo = lower_32_bits(ring->tp_addr);
+	arg.tail_idx_paddr_hi = upper_32_bits(ring->tp_addr);
+	arg.num_elems = ring->bufs_max;
+	arg.buf_size = ring->buf_sz;
+	arg.num_resp_per_event = ring->num_resp_per_event;
+	arg.event_timeout_ms = ring->event_timeout_ms;
+
+	ret = ath12k_wmi_pdev_dma_ring_cfg(ar, &arg);
+	if (ret) {
+		ath12k_warn(ar->ab, "failed to setup db ring cfg\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+int ath12k_dbring_set_cfg(struct ath12k *ar, struct ath12k_dbring *ring,
+			  u32 num_resp_per_event, u32 event_timeout_ms,
+			  int (*handler)(struct ath12k *,
+					 struct ath12k_dbring_data *))
+{
+	if (WARN_ON(!ring))
+		return -EINVAL;
+
+	ring->num_resp_per_event = num_resp_per_event;
+	ring->event_timeout_ms = event_timeout_ms;
+	ring->handler = handler;
+
+	return 0;
+}
+
+int ath12k_dbring_buf_setup(struct ath12k *ar,
+			    struct ath12k_dbring *ring,
+			    struct ath12k_dbring_cap *db_cap)
+{
+	struct ath12k_base *ab = ar->ab;
+	struct hal_srng *srng;
+	int ret;
+
+	srng = &ab->hal.srng_list[ring->refill_srng.ring_id];
+	ring->bufs_max = ring->refill_srng.size /
+		ath12k_hal_srng_get_entrysize(ab, HAL_RXDMA_DIR_BUF);
+
+	ring->buf_sz = db_cap->min_buf_sz;
+	ring->buf_align = db_cap->min_buf_align;
+	ring->pdev_id = db_cap->pdev_id;
+	ring->hp_addr = ath12k_hal_srng_get_hp_addr(ab, srng);
+	ring->tp_addr = ath12k_hal_srng_get_tp_addr(ab, srng);
+
+	ret = ath12k_dbring_fill_bufs(ar, ring, GFP_KERNEL);
+
+	return ret;
+}
+
+int ath12k_dbring_srng_setup(struct ath12k *ar, struct ath12k_dbring *ring,
+			     int ring_num, int num_entries)
+{
+	int ret;
+
+	ret = ath12k_dp_srng_setup(ar->ab, &ring->refill_srng, HAL_RXDMA_DIR_BUF,
+				   ring_num, ar->pdev_idx, num_entries);
+	if (ret < 0) {
+		ath12k_warn(ar->ab, "failed to setup srng: %d ring_id %d\n",
+			    ret, ring_num);
+		goto err;
+	}
+
+	return 0;
+err:
+	ath12k_dp_srng_cleanup(ar->ab, &ring->refill_srng);
+	return ret;
+}
+
+int ath12k_dbring_get_cap(struct ath12k_base *ab,
+			  u8 pdev_idx,
+			  enum wmi_direct_buffer_module id,
+			  struct ath12k_dbring_cap *db_cap)
+{
+	int i;
+
+	if (!ab->num_db_cap || !ab->db_caps)
+		return -ENOENT;
+
+	if (id >= WMI_DIRECT_BUF_MAX)
+		return -EINVAL;
+
+	for (i = 0; i < ab->num_db_cap; i++) {
+		if (pdev_idx == ab->db_caps[i].pdev_id &&
+		    id == ab->db_caps[i].id) {
+			*db_cap = ab->db_caps[i];
+
+			return 0;
+		}
+	}
+
+	return -ENOENT;
+}
+
+int ath12k_dbring_buffer_release_event(struct ath12k_base *ab,
+				       struct ath12k_dbring_buf_release_event *ev)
+{
+	struct ath12k_dbring *ring;
+	struct hal_srng *srng;
+	struct ath12k *ar;
+	struct ath12k_dbring_element *buff;
+	struct ath12k_dbring_data handler_data;
+	struct ath12k_buffer_addr desc;
+	u8 *vaddr_unalign;
+	u32 num_entry, num_buff_reaped;
+	u8 pdev_idx, rbm;
+	u32 cookie;
+	int buf_id;
+	int size;
+	dma_addr_t paddr;
+	int ret = 0;
+
+	pdev_idx = le32_to_cpu(ev->fixed.pdev_id);
+
+	if (pdev_idx >= ab->num_radios) {
+		ath12k_warn(ab, "Invalid pdev id %d\n", pdev_idx);
+		return -EINVAL;
+	}
+
+	if (ev->fixed.num_buf_release_entry !=
+	    ev->fixed.num_meta_data_entry) {
+		ath12k_warn(ab, "Buffer entry %d mismatch meta entry %d\n",
+			    ev->fixed.num_buf_release_entry,
+			    ev->fixed.num_meta_data_entry);
+		return -EINVAL;
+	}
+
+	ar = ab->pdevs[pdev_idx].ar;
+
+	rcu_read_lock();
+	if (!rcu_dereference(ab->pdevs_active[pdev_idx])) {
+		ret = -EINVAL;
+		goto rcu_unlock;
+	}
+
+	switch (ev->fixed.module_id) {
+	case WMI_DIRECT_BUF_SPECTRAL:
+		break;
+	default:
+		ring = NULL;
+		ath12k_warn(ab, "Recv dma buffer release ev on unsupp module %d\n",
+			    ev->fixed.module_id);
+		break;
+	}
+
+	if (!ring) {
+		ret = -EINVAL;
+		goto rcu_unlock;
+	}
+
+	srng = &ab->hal.srng_list[ring->refill_srng.ring_id];
+	num_entry = le32_to_cpu(ev->fixed.num_buf_release_entry);
+	size = sizeof(*buff) + ring->buf_sz + ring->buf_align - 1;
+	num_buff_reaped = 0;
+
+	spin_lock_bh(&srng->lock);
+
+	while (num_buff_reaped < num_entry) {
+		desc.info0 = ev->buf_entry[num_buff_reaped].paddr_lo;
+		desc.info1 = ev->buf_entry[num_buff_reaped].paddr_hi;
+		handler_data.meta = ev->meta_data[num_buff_reaped];
+
+		num_buff_reaped++;
+
+		ath12k_hal_rx_buf_addr_info_get(&desc, &paddr, &cookie, &rbm);
+
+		buf_id = u32_get_bits(cookie, DP_RXDMA_BUF_COOKIE_BUF_ID);
+
+		spin_lock_bh(&ring->idr_lock);
+		buff = idr_find(&ring->bufs_idr, buf_id);
+		if (!buff) {
+			spin_unlock_bh(&ring->idr_lock);
+			continue;
+		}
+		idr_remove(&ring->bufs_idr, buf_id);
+		spin_unlock_bh(&ring->idr_lock);
+
+		dma_unmap_single(ab->dev, buff->paddr, ring->buf_sz,
+				 DMA_FROM_DEVICE);
+
+		if (ring->handler) {
+			vaddr_unalign = buff->payload;
+			handler_data.data = PTR_ALIGN(vaddr_unalign,
+						      ring->buf_align);
+			handler_data.data_sz = ring->buf_sz;
+
+			ring->handler(ar, &handler_data);
+		}
+
+		memset(buff, 0, size);
+		ath12k_dbring_bufs_replenish(ar, ring, buff, GFP_ATOMIC);
+	}
+
+	spin_unlock_bh(&srng->lock);
+
+rcu_unlock:
+	rcu_read_unlock();
+
+	return ret;
+}
+
+void ath12k_dbring_srng_cleanup(struct ath12k *ar, struct ath12k_dbring *ring)
+{
+	ath12k_dp_srng_cleanup(ar->ab, &ring->refill_srng);
+}
+
+void ath12k_dbring_buf_cleanup(struct ath12k *ar, struct ath12k_dbring *ring)
+{
+	struct ath12k_dbring_element *buff;
+	int buf_id;
+
+	spin_lock_bh(&ring->idr_lock);
+	idr_for_each_entry(&ring->bufs_idr, buff, buf_id) {
+		idr_remove(&ring->bufs_idr, buf_id);
+		dma_unmap_single(ar->ab->dev, buff->paddr,
+				 ring->buf_sz, DMA_FROM_DEVICE);
+		kfree(buff);
+	}
+
+	idr_destroy(&ring->bufs_idr);
+	spin_unlock_bh(&ring->idr_lock);
+}