diff options
Diffstat (limited to 'drivers/net/wireless/ath/ath11k/dbring.c')
| -rw-r--r-- | drivers/net/wireless/ath/ath11k/dbring.c | 399 |
1 files changed, 399 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath11k/dbring.c b/drivers/net/wireless/ath/ath11k/dbring.c new file mode 100644 index 000000000..5536e8642 --- /dev/null +++ b/drivers/net/wireless/ath/ath11k/dbring.c @@ -0,0 +1,399 @@ +// SPDX-License-Identifier: BSD-3-Clause-Clear +/* + * Copyright (c) 2019-2020 The Linux Foundation. All rights reserved. + */ + +#include "core.h" +#include "debug.h" + +#define ATH11K_DB_MAGIC_VALUE 0xdeadbeaf + +int ath11k_dbring_validate_buffer(struct ath11k *ar, void *buffer, u32 size) +{ + u32 *temp; + int idx; + + size = size >> 2; + + for (idx = 0, temp = buffer; idx < size; idx++, temp++) { + if (*temp == ATH11K_DB_MAGIC_VALUE) + return -EINVAL; + } + + return 0; +} + +static void ath11k_dbring_fill_magic_value(struct ath11k *ar, + void *buffer, u32 size) +{ + /* memset32 function fills buffer payload with the ATH11K_DB_MAGIC_VALUE + * and the variable size is expected to be the number of u32 values + * to be stored, not the number of bytes. + */ + size = size / sizeof(u32); + + memset32(buffer, ATH11K_DB_MAGIC_VALUE, size); +} + +static int ath11k_dbring_bufs_replenish(struct ath11k *ar, + struct ath11k_dbring *ring, + struct ath11k_dbring_element *buff, + enum wmi_direct_buffer_module id) +{ + struct ath11k_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); + + ath11k_hal_srng_access_begin(ab, srng); + + ptr_unaligned = buff->payload; + ptr_aligned = PTR_ALIGN(ptr_unaligned, ring->buf_align); + ath11k_dbring_fill_magic_value(ar, ptr_aligned, ring->buf_sz); + 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_ATOMIC); + spin_unlock_bh(&ring->idr_lock); + if (buf_id < 0) { + ret = -ENOBUFS; + goto err_dma_unmap; + } + + desc = ath11k_hal_srng_src_get_next_entry(ab, srng); + if (!desc) { + ret = -ENOENT; + goto err_idr_remove; + } + + buff->paddr = paddr; + + cookie = FIELD_PREP(DP_RXDMA_BUF_COOKIE_PDEV_ID, ar->pdev_idx) | + FIELD_PREP(DP_RXDMA_BUF_COOKIE_BUF_ID, buf_id); + + ath11k_hal_rx_buf_addr_info_set(desc, paddr, cookie, 0); + + ath11k_debugfs_add_dbring_entry(ar, id, ATH11K_DBG_DBR_EVENT_REPLENISH, srng); + ath11k_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: + ath11k_hal_srng_access_end(ab, srng); + return ret; +} + +static int ath11k_dbring_fill_bufs(struct ath11k *ar, + struct ath11k_dbring *ring, + enum wmi_direct_buffer_module id) +{ + struct ath11k_dbring_element *buff; + struct hal_srng *srng; + int num_remain, req_entries, num_free; + u32 align; + int size, ret; + + srng = &ar->ab->hal.srng_list[ring->refill_srng.ring_id]; + + spin_lock_bh(&srng->lock); + + num_free = ath11k_hal_srng_src_num_free(ar->ab, srng, true); + req_entries = min(num_free, ring->bufs_max); + num_remain = req_entries; + align = ring->buf_align; + size = ring->buf_sz + align - 1; + + while (num_remain > 0) { + buff = kzalloc(sizeof(*buff), GFP_ATOMIC); + if (!buff) + break; + + buff->payload = kzalloc(size, GFP_ATOMIC); + if (!buff->payload) { + kfree(buff); + break; + } + ret = ath11k_dbring_bufs_replenish(ar, ring, buff, id); + if (ret) { + ath11k_warn(ar->ab, "failed to replenish db ring num_remain %d req_ent %d\n", + num_remain, req_entries); + kfree(buff->payload); + kfree(buff); + break; + } + num_remain--; + } + + spin_unlock_bh(&srng->lock); + + return num_remain; +} + +int ath11k_dbring_wmi_cfg_setup(struct ath11k *ar, + struct ath11k_dbring *ring, + enum wmi_direct_buffer_module id) +{ + struct ath11k_wmi_pdev_dma_ring_cfg_req_cmd param = {0}; + int ret; + + if (id >= WMI_DIRECT_BUF_MAX) + return -EINVAL; + + param.pdev_id = DP_SW2HW_MACID(ring->pdev_id); + param.module_id = id; + param.base_paddr_lo = lower_32_bits(ring->refill_srng.paddr); + param.base_paddr_hi = upper_32_bits(ring->refill_srng.paddr); + param.head_idx_paddr_lo = lower_32_bits(ring->hp_addr); + param.head_idx_paddr_hi = upper_32_bits(ring->hp_addr); + param.tail_idx_paddr_lo = lower_32_bits(ring->tp_addr); + param.tail_idx_paddr_hi = upper_32_bits(ring->tp_addr); + param.num_elems = ring->bufs_max; + param.buf_size = ring->buf_sz; + param.num_resp_per_event = ring->num_resp_per_event; + param.event_timeout_ms = ring->event_timeout_ms; + + ret = ath11k_wmi_pdev_dma_ring_cfg(ar, ¶m); + if (ret) { + ath11k_warn(ar->ab, "failed to setup db ring cfg\n"); + return ret; + } + + return 0; +} + +int ath11k_dbring_set_cfg(struct ath11k *ar, struct ath11k_dbring *ring, + u32 num_resp_per_event, u32 event_timeout_ms, + int (*handler)(struct ath11k *, + struct ath11k_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 ath11k_dbring_buf_setup(struct ath11k *ar, + struct ath11k_dbring *ring, + struct ath11k_dbring_cap *db_cap) +{ + struct ath11k_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 / + ath11k_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 = ath11k_hal_srng_get_hp_addr(ar->ab, srng); + ring->tp_addr = ath11k_hal_srng_get_tp_addr(ar->ab, srng); + + ret = ath11k_dbring_fill_bufs(ar, ring, db_cap->id); + + return ret; +} + +int ath11k_dbring_srng_setup(struct ath11k *ar, struct ath11k_dbring *ring, + int ring_num, int num_entries) +{ + int ret; + + ret = ath11k_dp_srng_setup(ar->ab, &ring->refill_srng, HAL_RXDMA_DIR_BUF, + ring_num, ar->pdev_idx, num_entries); + if (ret < 0) { + ath11k_warn(ar->ab, "failed to setup srng: %d ring_id %d\n", + ret, ring_num); + goto err; + } + + return 0; +err: + ath11k_dp_srng_cleanup(ar->ab, &ring->refill_srng); + return ret; +} + +int ath11k_dbring_get_cap(struct ath11k_base *ab, + u8 pdev_idx, + enum wmi_direct_buffer_module id, + struct ath11k_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 ath11k_dbring_buffer_release_event(struct ath11k_base *ab, + struct ath11k_dbring_buf_release_event *ev) +{ + struct ath11k_dbring *ring; + struct hal_srng *srng; + struct ath11k *ar; + struct ath11k_dbring_element *buff; + struct ath11k_dbring_data handler_data; + struct ath11k_buffer_addr desc; + u8 *vaddr_unalign; + u32 num_entry, num_buff_reaped; + u8 pdev_idx, rbm, module_id; + u32 cookie; + int buf_id; + int size; + dma_addr_t paddr; + int ret = 0; + + pdev_idx = ev->fixed.pdev_id; + module_id = ev->fixed.module_id; + + if (pdev_idx >= ab->num_radios) { + ath11k_warn(ab, "Invalid pdev id %d\n", pdev_idx); + return -EINVAL; + } + + if (ev->fixed.num_buf_release_entry != + ev->fixed.num_meta_data_entry) { + ath11k_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: + ring = ath11k_spectral_get_dbring(ar); + break; + default: + ring = NULL; + ath11k_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 = ev->fixed.num_buf_release_entry; + size = 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++; + + ath11k_hal_rx_buf_addr_info_get(&desc, &paddr, &cookie, &rbm); + + buf_id = FIELD_GET(DP_RXDMA_BUF_COOKIE_BUF_ID, cookie); + + 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); + + ath11k_debugfs_add_dbring_entry(ar, module_id, + ATH11K_DBG_DBR_EVENT_RX, srng); + + 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); + } + + buff->paddr = 0; + memset(buff->payload, 0, size); + ath11k_dbring_bufs_replenish(ar, ring, buff, module_id); + } + + spin_unlock_bh(&srng->lock); + +rcu_unlock: + rcu_read_unlock(); + + return ret; +} + +void ath11k_dbring_srng_cleanup(struct ath11k *ar, struct ath11k_dbring *ring) +{ + ath11k_dp_srng_cleanup(ar->ab, &ring->refill_srng); +} + +void ath11k_dbring_buf_cleanup(struct ath11k *ar, struct ath11k_dbring *ring) +{ + struct ath11k_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->payload); + kfree(buff); + } + + idr_destroy(&ring->bufs_idr); + spin_unlock_bh(&ring->idr_lock); +} |