6.14-stable review patch. If anyone has any objections, please let me know.
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From: P Praneesh quic_ppranees@quicinc.com
[ Upstream commit eeadc6baf8b3dcd32787cc84f0473dc2a2850370 ]
Currently, the driver allocates cacheable DMA buffers for the rx_tid structure using kzalloc() and dma_map_single(). These buffers are long-lived and can persist for the lifetime of the peer, which is not advisable. Instead of using kzalloc() and dma_map_single() for allocating cacheable DMA buffers, utilize the dma_alloc_noncoherent() helper for the allocation of long-lived cacheable DMA buffers, such as the peer's rx_tid. Since dma_alloc_noncoherent() returns unaligned physical and virtual addresses, align them internally before use within the driver. This ensures proper allocation of non-coherent memory through the kernel helper.
Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1 Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3
Signed-off-by: P Praneesh quic_ppranees@quicinc.com Tested-by: Tim Harvey tharvey@gateworks.com Link: https://patch.msgid.link/20250119164219.647059-3-quic_ppranees@quicinc.com Signed-off-by: Jeff Johnson jeff.johnson@oss.qualcomm.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/ath/ath11k/dp.h | 6 +- drivers/net/wireless/ath/ath11k/dp_rx.c | 117 +++++++++++------------- 2 files changed, 58 insertions(+), 65 deletions(-)
diff --git a/drivers/net/wireless/ath/ath11k/dp.h b/drivers/net/wireless/ath/ath11k/dp.h index f777314db8b36..7a55afd33be82 100644 --- a/drivers/net/wireless/ath/ath11k/dp.h +++ b/drivers/net/wireless/ath/ath11k/dp.h @@ -1,7 +1,7 @@ /* SPDX-License-Identifier: BSD-3-Clause-Clear */ /* * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved. - * Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved. + * Copyright (c) 2021-2023, 2025 Qualcomm Innovation Center, Inc. All rights reserved. */
#ifndef ATH11K_DP_H @@ -20,7 +20,6 @@ struct ath11k_ext_irq_grp;
struct dp_rx_tid { u8 tid; - u32 *vaddr; dma_addr_t paddr; u32 size; u32 ba_win_sz; @@ -37,6 +36,9 @@ struct dp_rx_tid { /* Timer info related to fragments */ struct timer_list frag_timer; struct ath11k_base *ab; + u32 *vaddr_unaligned; + dma_addr_t paddr_unaligned; + u32 unaligned_size; };
#define DP_REO_DESC_FREE_THRESHOLD 64 diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c index b8b3dce9cdb53..a7a484a9ba7fb 100644 --- a/drivers/net/wireless/ath/ath11k/dp_rx.c +++ b/drivers/net/wireless/ath/ath11k/dp_rx.c @@ -1,7 +1,7 @@ // SPDX-License-Identifier: BSD-3-Clause-Clear /* * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved. - * Copyright (c) 2021-2024 Qualcomm Innovation Center, Inc. All rights reserved. + * Copyright (c) 2021-2025 Qualcomm Innovation Center, Inc. All rights reserved. */
#include <linux/ieee80211.h> @@ -675,11 +675,11 @@ void ath11k_dp_reo_cmd_list_cleanup(struct ath11k_base *ab) list_for_each_entry_safe(cmd, tmp, &dp->reo_cmd_list, list) { list_del(&cmd->list); rx_tid = &cmd->data; - if (rx_tid->vaddr) { - dma_unmap_single(ab->dev, rx_tid->paddr, - rx_tid->size, DMA_BIDIRECTIONAL); - kfree(rx_tid->vaddr); - rx_tid->vaddr = NULL; + if (rx_tid->vaddr_unaligned) { + dma_free_noncoherent(ab->dev, rx_tid->unaligned_size, + rx_tid->vaddr_unaligned, + rx_tid->paddr_unaligned, DMA_BIDIRECTIONAL); + rx_tid->vaddr_unaligned = NULL; } kfree(cmd); } @@ -689,11 +689,11 @@ void ath11k_dp_reo_cmd_list_cleanup(struct ath11k_base *ab) list_del(&cmd_cache->list); dp->reo_cmd_cache_flush_count--; rx_tid = &cmd_cache->data; - if (rx_tid->vaddr) { - dma_unmap_single(ab->dev, rx_tid->paddr, - rx_tid->size, DMA_BIDIRECTIONAL); - kfree(rx_tid->vaddr); - rx_tid->vaddr = NULL; + if (rx_tid->vaddr_unaligned) { + dma_free_noncoherent(ab->dev, rx_tid->unaligned_size, + rx_tid->vaddr_unaligned, + rx_tid->paddr_unaligned, DMA_BIDIRECTIONAL); + rx_tid->vaddr_unaligned = NULL; } kfree(cmd_cache); } @@ -708,11 +708,11 @@ static void ath11k_dp_reo_cmd_free(struct ath11k_dp *dp, void *ctx, if (status != HAL_REO_CMD_SUCCESS) ath11k_warn(dp->ab, "failed to flush rx tid hw desc, tid %d status %d\n", rx_tid->tid, status); - if (rx_tid->vaddr) { - dma_unmap_single(dp->ab->dev, rx_tid->paddr, rx_tid->size, - DMA_BIDIRECTIONAL); - kfree(rx_tid->vaddr); - rx_tid->vaddr = NULL; + if (rx_tid->vaddr_unaligned) { + dma_free_noncoherent(dp->ab->dev, rx_tid->unaligned_size, + rx_tid->vaddr_unaligned, + rx_tid->paddr_unaligned, DMA_BIDIRECTIONAL); + rx_tid->vaddr_unaligned = NULL; } }
@@ -749,10 +749,10 @@ static void ath11k_dp_reo_cache_flush(struct ath11k_base *ab, if (ret) { ath11k_err(ab, "failed to send HAL_REO_CMD_FLUSH_CACHE cmd, tid %d (%d)\n", rx_tid->tid, ret); - dma_unmap_single(ab->dev, rx_tid->paddr, rx_tid->size, - DMA_BIDIRECTIONAL); - kfree(rx_tid->vaddr); - rx_tid->vaddr = NULL; + dma_free_noncoherent(ab->dev, rx_tid->unaligned_size, + rx_tid->vaddr_unaligned, + rx_tid->paddr_unaligned, DMA_BIDIRECTIONAL); + rx_tid->vaddr_unaligned = NULL; } }
@@ -802,10 +802,10 @@ static void ath11k_dp_rx_tid_del_func(struct ath11k_dp *dp, void *ctx,
return; free_desc: - dma_unmap_single(ab->dev, rx_tid->paddr, rx_tid->size, - DMA_BIDIRECTIONAL); - kfree(rx_tid->vaddr); - rx_tid->vaddr = NULL; + dma_free_noncoherent(ab->dev, rx_tid->unaligned_size, + rx_tid->vaddr_unaligned, + rx_tid->paddr_unaligned, DMA_BIDIRECTIONAL); + rx_tid->vaddr_unaligned = NULL; }
void ath11k_peer_rx_tid_delete(struct ath11k *ar, @@ -831,14 +831,16 @@ void ath11k_peer_rx_tid_delete(struct ath11k *ar, if (ret != -ESHUTDOWN) ath11k_err(ar->ab, "failed to send HAL_REO_CMD_UPDATE_RX_QUEUE cmd, tid %d (%d)\n", tid, ret); - dma_unmap_single(ar->ab->dev, rx_tid->paddr, rx_tid->size, - DMA_BIDIRECTIONAL); - kfree(rx_tid->vaddr); - rx_tid->vaddr = NULL; + dma_free_noncoherent(ar->ab->dev, rx_tid->unaligned_size, + rx_tid->vaddr_unaligned, + rx_tid->paddr_unaligned, DMA_BIDIRECTIONAL); + rx_tid->vaddr_unaligned = NULL; }
rx_tid->paddr = 0; + rx_tid->paddr_unaligned = 0; rx_tid->size = 0; + rx_tid->unaligned_size = 0; }
static int ath11k_dp_rx_link_desc_return(struct ath11k_base *ab, @@ -982,10 +984,9 @@ static void ath11k_dp_rx_tid_mem_free(struct ath11k_base *ab, if (!rx_tid->active) goto unlock_exit;
- dma_unmap_single(ab->dev, rx_tid->paddr, rx_tid->size, - DMA_BIDIRECTIONAL); - kfree(rx_tid->vaddr); - rx_tid->vaddr = NULL; + dma_free_noncoherent(ab->dev, rx_tid->unaligned_size, rx_tid->vaddr_unaligned, + rx_tid->paddr_unaligned, DMA_BIDIRECTIONAL); + rx_tid->vaddr_unaligned = NULL;
rx_tid->active = false;
@@ -1000,9 +1001,8 @@ int ath11k_peer_rx_tid_setup(struct ath11k *ar, const u8 *peer_mac, int vdev_id, struct ath11k_base *ab = ar->ab; struct ath11k_peer *peer; struct dp_rx_tid *rx_tid; - u32 hw_desc_sz; - u32 *addr_aligned; - void *vaddr; + u32 hw_desc_sz, *vaddr; + void *vaddr_unaligned; dma_addr_t paddr; int ret;
@@ -1050,49 +1050,40 @@ int ath11k_peer_rx_tid_setup(struct ath11k *ar, const u8 *peer_mac, int vdev_id, else hw_desc_sz = ath11k_hal_reo_qdesc_size(DP_BA_WIN_SZ_MAX, tid);
- vaddr = kzalloc(hw_desc_sz + HAL_LINK_DESC_ALIGN - 1, GFP_ATOMIC); - if (!vaddr) { + rx_tid->unaligned_size = hw_desc_sz + HAL_LINK_DESC_ALIGN - 1; + vaddr_unaligned = dma_alloc_noncoherent(ab->dev, rx_tid->unaligned_size, &paddr, + DMA_BIDIRECTIONAL, GFP_ATOMIC); + if (!vaddr_unaligned) { spin_unlock_bh(&ab->base_lock); return -ENOMEM; }
- addr_aligned = PTR_ALIGN(vaddr, HAL_LINK_DESC_ALIGN); - - ath11k_hal_reo_qdesc_setup(addr_aligned, tid, ba_win_sz, - ssn, pn_type); - - paddr = dma_map_single(ab->dev, addr_aligned, hw_desc_sz, - DMA_BIDIRECTIONAL); - - ret = dma_mapping_error(ab->dev, paddr); - if (ret) { - spin_unlock_bh(&ab->base_lock); - ath11k_warn(ab, "failed to setup dma map for peer %pM rx tid %d: %d\n", - peer_mac, tid, ret); - goto err_mem_free; - } - - rx_tid->vaddr = vaddr; - rx_tid->paddr = paddr; + rx_tid->vaddr_unaligned = vaddr_unaligned; + vaddr = PTR_ALIGN(vaddr_unaligned, HAL_LINK_DESC_ALIGN); + rx_tid->paddr_unaligned = paddr; + rx_tid->paddr = rx_tid->paddr_unaligned + ((unsigned long)vaddr - + (unsigned long)rx_tid->vaddr_unaligned); + ath11k_hal_reo_qdesc_setup(vaddr, tid, ba_win_sz, ssn, pn_type); rx_tid->size = hw_desc_sz; rx_tid->active = true;
+ /* After dma_alloc_noncoherent, vaddr is being modified for reo qdesc setup. + * Since these changes are not reflected in the device, driver now needs to + * explicitly call dma_sync_single_for_device. + */ + dma_sync_single_for_device(ab->dev, rx_tid->paddr, + rx_tid->size, + DMA_TO_DEVICE); spin_unlock_bh(&ab->base_lock);
- ret = ath11k_wmi_peer_rx_reorder_queue_setup(ar, vdev_id, peer_mac, - paddr, tid, 1, ba_win_sz); + ret = ath11k_wmi_peer_rx_reorder_queue_setup(ar, vdev_id, peer_mac, rx_tid->paddr, + tid, 1, ba_win_sz); if (ret) { ath11k_warn(ar->ab, "failed to setup rx reorder queue for peer %pM tid %d: %d\n", peer_mac, tid, ret); ath11k_dp_rx_tid_mem_free(ab, peer_mac, vdev_id, tid); }
- return ret; - -err_mem_free: - kfree(rx_tid->vaddr); - rx_tid->vaddr = NULL; - return ret; }