| /****************************************************************************** |
| * |
| * Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved. |
| * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH |
| * Copyright(c) 2016 - 2017 Intel Deutschland GmbH |
| * Copyright(c) 2018 Intel Corporation |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name Intel Corporation nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| *****************************************************************************/ |
| |
| #include "third_party/iwlwifi/fw/api/tx.h" |
| |
| #include <zircon/status.h> |
| #include <zircon/types.h> |
| |
| #include "third_party/iwlwifi/platform/ieee80211_include.h" |
| |
| #if 0 // NEEDS_PORTING |
| #include "third_party/iwlwifi/iwl-op-mode.h" |
| #endif // NEEDS_PORTING |
| #include "third_party/iwlwifi/iwl-csr.h" |
| #include "third_party/iwlwifi/iwl-debug.h" |
| #include "third_party/iwlwifi/iwl-io.h" |
| #include "third_party/iwlwifi/iwl-prph.h" |
| #include "third_party/iwlwifi/iwl-scd.h" |
| #include "third_party/iwlwifi/pcie/internal.h" |
| #include "third_party/iwlwifi/platform/ieee80211_include.h" |
| |
| #define IWL_TX_CRC_SIZE 4 |
| #define IWL_TX_DELIMITER_SIZE 4 |
| |
| #define TB1_MAX_SIZE sizeof(struct iwl_device_cmd) // 304-byte |
| |
| /*************** DMA-QUEUE-GENERAL-FUNCTIONS ***** |
| * DMA services |
| * |
| * Theory of operation |
| * |
| * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer |
| * of buffer descriptors, each of which points to one or more data buffers for |
| * the device to read from or fill. Driver and device exchange status of each |
| * queue via "read" and "write" pointers. Driver keeps minimum of 2 empty |
| * entries in each circular buffer, to protect against confusing empty and full |
| * queue states. |
| * |
| * The device reads or writes the data in the queues via the device's several |
| * DMA/FIFO channels. Each queue is mapped to a single DMA channel. |
| * |
| * For Tx queue, there are low mark and high mark limits. If, after queuing |
| * the packet for Tx, free space become < low mark, Tx queue stopped. When |
| * reclaiming packets (on 'tx done IRQ), if free space become > high mark, |
| * Tx queue resumed. |
| * |
| ***************************************************/ |
| |
| int iwl_queue_space(struct iwl_trans* trans, const struct iwl_txq* q) { |
| uint16_t max; |
| uint16_t used; |
| |
| /* |
| * To avoid ambiguity between empty and completely full queues, there |
| * should always be less than max_tfd_queue_size elements in the queue. |
| * If q->n_window is smaller than max_tfd_queue_size, there is no need |
| * to reserve any queue entries for this purpose. |
| */ |
| if (q->n_window < trans->cfg->base_params->max_tfd_queue_size) { |
| max = q->n_window; |
| } else { |
| max = trans->cfg->base_params->max_tfd_queue_size - 1; |
| } |
| |
| /* |
| * max_tfd_queue_size is a power of 2, so the following is equivalent to |
| * modulo by max_tfd_queue_size and is well defined. |
| */ |
| used = (q->write_ptr - q->read_ptr) & (trans->cfg->base_params->max_tfd_queue_size - 1); |
| |
| if (WARN_ON(used > max)) { |
| return 0; |
| } |
| |
| return max - used; |
| } |
| |
| /* |
| * iwl_queue_init - Initialize queue's high/low-water and read/write indexes |
| */ |
| static zx_status_t iwl_queue_init(struct iwl_txq* q, uint16_t slots_num) { |
| q->n_window = slots_num; |
| |
| // slots_num must be power-of-two size, otherwise iwl_pcie_get_cmd_index is broken. |
| if (WARN_ON(slots_num <= 0 || (slots_num & (slots_num - 1)) != 0)) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| q->low_mark = q->n_window / 4; |
| if (q->low_mark < 4) { |
| q->low_mark = 4; |
| } |
| |
| q->high_mark = q->n_window / 8; |
| if (q->high_mark < 2) { |
| q->high_mark = 2; |
| } |
| |
| q->write_ptr = 0; |
| q->read_ptr = 0; |
| |
| return ZX_OK; |
| } |
| |
| zx_status_t iwl_pcie_alloc_dma_ptr(struct iwl_trans* trans, struct iwl_dma_ptr* ptr, size_t size) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| zx_status_t status = iwl_iobuf_allocate_contiguous(&trans_pcie->pci_dev->dev, size, &ptr->io_buf); |
| if (status != ZX_OK) { |
| return status; |
| } |
| |
| ptr->size = size; |
| ptr->addr = iwl_iobuf_virtual(ptr->io_buf); |
| ptr->dma = iwl_iobuf_physical(ptr->io_buf); |
| return ZX_OK; |
| } |
| |
| void iwl_pcie_free_dma_ptr(struct iwl_trans* trans, struct iwl_dma_ptr* ptr) { |
| iwl_iobuf_release(ptr->io_buf); |
| ptr->io_buf = NULL; |
| } |
| |
| static void iwl_pcie_txq_stuck_timer(void* data) { |
| struct iwl_txq* txq = data; |
| |
| mtx_lock(&txq->lock); |
| /* check if triggered erroneously */ |
| if (txq->read_ptr == txq->write_ptr) { |
| mtx_unlock(&txq->lock); |
| return; |
| } |
| mtx_unlock(&txq->lock); |
| |
| #if 0 // NEEDS_PORTING |
| struct iwl_trans_pcie* trans_pcie = txq->trans_pcie; |
| struct iwl_trans* trans = iwl_trans_pcie_get_trans(trans_pcie); |
| iwl_trans_pcie_log_scd_error(trans, txq); |
| |
| iwl_force_nmi(trans); |
| #endif // NEEDS_PORTING |
| } |
| |
| /* |
| * iwl_pcie_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array |
| */ |
| static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans* trans, struct iwl_txq* txq, |
| uint16_t byte_cnt, int num_tbs) { |
| struct iwlagn_scd_bc_tbl* scd_bc_tbl; |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| int write_ptr = txq->write_ptr; |
| int txq_id = txq->id; |
| uint16_t len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE; |
| __le16 bc_ent; |
| struct iwl_tx_cmd* tx_cmd = |
| (void*)((struct iwl_device_cmd*)iwl_iobuf_virtual( |
| txq->entries[iwl_pcie_get_cmd_index(txq, txq->write_ptr)].cmd)) |
| ->payload; |
| uint8_t sta_id = tx_cmd->sta_id; |
| |
| scd_bc_tbl = trans_pcie->scd_bc_tbls.addr; |
| |
| #if 0 // NEEDS_PORTING |
| // TODO(37594): encryption |
| switch (sec_ctl & TX_CMD_SEC_MSK) { |
| case TX_CMD_SEC_CCM: |
| len += IEEE80211_CCMP_128_MIC_LEN; |
| break; |
| case TX_CMD_SEC_TKIP: |
| len += IEEE80211_TKIP_ICV_LEN; |
| break; |
| case TX_CMD_SEC_WEP: |
| len += IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN; |
| break; |
| } |
| #endif // NEEDS_PORTING |
| if (trans_pcie->bc_table_dword) { |
| len = DIV_ROUND_UP(len, 4); |
| } |
| |
| if (len > 0xFFF) { |
| IWL_WARN(trans, "%s(): invalid len: %d (expect smaller than 4096\n", __func__, len); |
| return; |
| } |
| if (write_ptr >= TFD_QUEUE_SIZE_MAX) { |
| IWL_WARN(trans, "%s(): invalid write_ptr: %d (expect smaller than %d.\n", __func__, write_ptr, |
| TFD_QUEUE_SIZE_MAX); |
| return; |
| } |
| |
| bc_ent = cpu_to_le16(len | (sta_id << 12)); |
| |
| scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent; |
| |
| if (write_ptr < TFD_QUEUE_SIZE_BC_DUP) { |
| scd_bc_tbl[txq_id].tfd_offset[TFD_QUEUE_SIZE_MAX + write_ptr] = bc_ent; |
| } |
| } |
| |
| #if 0 // NEEDS_PORTING |
| static void iwl_pcie_txq_inval_byte_cnt_tbl(struct iwl_trans* trans, struct iwl_txq* txq) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwlagn_scd_bc_tbl* scd_bc_tbl = trans_pcie->scd_bc_tbls.addr; |
| int txq_id = txq->id; |
| int read_ptr = txq->read_ptr; |
| uint8_t sta_id = 0; |
| __le16 bc_ent; |
| struct iwl_tx_cmd* tx_cmd = (void*)txq->entries[read_ptr].cmd->payload; |
| |
| WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX); |
| |
| if (txq_id != trans_pcie->cmd_queue) { sta_id = tx_cmd->sta_id; } |
| |
| bc_ent = cpu_to_le16(1 | (sta_id << 12)); |
| |
| scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent; |
| |
| if (read_ptr < TFD_QUEUE_SIZE_BC_DUP) { |
| scd_bc_tbl[txq_id].tfd_offset[TFD_QUEUE_SIZE_MAX + read_ptr] = bc_ent; |
| } |
| } |
| #endif // NEEDS_PORTING |
| |
| /* |
| * iwl_pcie_txq_inc_wr_ptr - Send new write index to hardware |
| */ |
| static void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans* trans, struct iwl_txq* txq) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| uint32_t reg = 0; |
| int txq_id = txq->id; |
| |
| iwl_assert_lock_held(&txq->lock); |
| |
| /* |
| * explicitly wake up the NIC if: |
| * 1. shadow registers aren't enabled |
| * 2. NIC is woken up for CMD regardless of shadow outside this function |
| * 3. there is a chance that the NIC is asleep |
| */ |
| if (!trans->cfg->base_params->shadow_reg_enable && txq_id != trans_pcie->cmd_queue && |
| test_bit(STATUS_TPOWER_PMI, &trans->status)) { |
| /* |
| * wake up nic if it's powered down ... |
| * uCode will wake up, and interrupt us again, so next |
| * time we'll skip this part. |
| */ |
| reg = iwl_read32(trans, CSR_UCODE_DRV_GP1); |
| |
| if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { |
| IWL_DEBUG_INFO(trans, "Tx queue %d requesting wakeup, GP1 = 0x%x\n", txq_id, reg); |
| iwl_set_bit(trans, CSR_GP_CNTRL, BIT(trans->cfg->csr->flag_mac_access_req)); |
| txq->need_update = true; |
| return; |
| } |
| } |
| |
| /* |
| * if not in power-save mode, uCode will never sleep when we're |
| * trying to tx (during RFKILL, we're not trying to tx). |
| */ |
| IWL_DEBUG_TX(trans, "Q:%d WR: 0x%x\n", txq_id, txq->write_ptr); |
| if (!txq->block) { |
| iwl_write32(trans, HBUS_TARG_WRPTR, txq->write_ptr | (txq_id << 8)); |
| } |
| } |
| |
| void iwl_pcie_txq_check_wrptrs(struct iwl_trans* trans) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| int i; |
| |
| for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) { |
| struct iwl_txq* txq = trans_pcie->txq[i]; |
| |
| if (!test_bit(i, trans_pcie->queue_used)) { |
| continue; |
| } |
| |
| mtx_lock(&txq->lock); |
| if (txq->need_update) { |
| iwl_pcie_txq_inc_wr_ptr(trans, txq); |
| txq->need_update = false; |
| } |
| mtx_unlock(&txq->lock); |
| } |
| } |
| |
| static inline void iwl_pcie_tfd_set_tb(struct iwl_trans* trans, void* tfd, uint8_t idx, |
| zx_paddr_t addr, uint16_t len) { |
| struct iwl_tfd* tfd_fh = (void*)tfd; |
| struct iwl_tfd_tb* tb = &tfd_fh->tbs[idx]; |
| |
| uint16_t hi_n_len = len << 4; |
| |
| tb->lo = cpu_to_le32(addr); |
| hi_n_len |= iwl_get_dma_hi_addr(addr); |
| |
| tb->hi_n_len = cpu_to_le16(hi_n_len); |
| |
| tfd_fh->num_tbs = idx + 1; |
| } |
| |
| static inline uint8_t iwl_pcie_tfd_get_num_tbs(struct iwl_trans* trans, void* _tfd) { |
| if (trans->cfg->use_tfh) { |
| struct iwl_tfh_tfd* tfd = _tfd; |
| |
| return le16_to_cpu(tfd->num_tbs) & 0x1f; |
| } else { |
| struct iwl_tfd* tfd = _tfd; |
| |
| return tfd->num_tbs & 0x1f; |
| } |
| } |
| |
| // |
| // Since DMA addresses are manipulated by iobufs, we don't do DMA unmap here. Instead, |
| // we update the TFD entry only (zero-ing num_tbs). |
| // |
| static void iwl_pcie_tfd_unmap(struct iwl_trans* trans, struct iwl_cmd_meta* meta, |
| struct iwl_txq* txq, int index) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| int num_tbs; |
| void* tfd = iwl_pcie_get_tfd(trans, txq, index); |
| |
| /* Sanity check on number of chunks */ |
| num_tbs = iwl_pcie_tfd_get_num_tbs(trans, tfd); |
| |
| if (num_tbs > trans_pcie->max_tbs) { |
| IWL_ERR(trans, "Too many chunks: %i\n", num_tbs); |
| /* @todo issue fatal error, it is quite serious situation */ |
| return; |
| } |
| |
| // First TB is never freed - it's the bidirectional DMA data. |
| // All first TBs (first_tb_bufs) will be freed at iwl_pcie_txq_free(). |
| |
| if (trans->cfg->use_tfh) { |
| struct iwl_tfh_tfd* tfd_fh = (void*)tfd; |
| |
| tfd_fh->num_tbs = 0; |
| } else { |
| struct iwl_tfd* tfd_fh = (void*)tfd; |
| |
| tfd_fh->num_tbs = 0; |
| } |
| } |
| |
| /* |
| * iwl_pcie_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr] |
| * @trans - transport private data |
| * @txq - tx queue |
| * |
| * Does NOT advance any TFD circular buffer read/write indexes |
| * Does NOT free the TFD itself (which is within circular buffer) |
| */ |
| void iwl_pcie_txq_free_tfd(struct iwl_trans* trans, struct iwl_txq* txq) { |
| /* rd_ptr is bounded by TFD_QUEUE_SIZE_MAX and |
| * idx is bounded by n_window |
| */ |
| int rd_ptr = txq->read_ptr; |
| int idx = iwl_pcie_get_cmd_index(txq, rd_ptr); |
| |
| iwl_assert_lock_held(&txq->lock); |
| |
| /* We have only q->n_window txq->entries, but we use |
| * TFD_QUEUE_SIZE_MAX tfds |
| */ |
| iwl_pcie_tfd_unmap(trans, &txq->entries[idx].meta, txq, rd_ptr); |
| } |
| |
| // Build TX queue transfer descriptor. |
| // |
| // TODO(fxbug.dev/61186): refactor this for testing. |
| // |
| static zx_status_t iwl_pcie_txq_build_tfd(struct iwl_trans* trans, struct iwl_txq* txq, |
| zx_paddr_t addr, uint16_t len, bool reset, |
| uint32_t* num_tbs) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| void* tfd; |
| |
| void* tfds = iwl_iobuf_virtual(txq->tfds); |
| tfd = tfds + trans_pcie->tfd_size * txq->write_ptr; |
| |
| if (reset) { |
| memset(tfd, 0, trans_pcie->tfd_size); |
| } |
| |
| *num_tbs = iwl_pcie_tfd_get_num_tbs(trans, tfd); |
| |
| /* Each TFD can point to a maximum max_tbs Tx buffers */ |
| if (*num_tbs >= trans_pcie->max_tbs) { |
| IWL_ERR(trans, "Error can not send more than %d chunks\n", trans_pcie->max_tbs); |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| if (addr & ~IWL_TX_DMA_MASK) { |
| IWL_WARN(trans, "Unaligned address = %lx\n", addr); |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| iwl_pcie_tfd_set_tb(trans, tfd, *num_tbs, addr, len); |
| |
| return ZX_OK; |
| } |
| |
| zx_status_t iwl_pcie_txq_alloc(struct iwl_trans* trans, struct iwl_txq* txq, uint16_t slots_num, |
| bool cmd_queue) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| |
| if (WARN_ON(txq->entries || txq->tfds)) { |
| return ZX_ERR_BAD_STATE; |
| } |
| |
| size_t tfd_sz = trans_pcie->tfd_size * trans->cfg->base_params->max_tfd_queue_size; |
| if (trans->cfg->use_tfh) { |
| tfd_sz = trans_pcie->tfd_size * slots_num; |
| } |
| |
| iwl_irq_timer_create(trans->dev, iwl_pcie_txq_stuck_timer, &txq, &txq->stuck_timer); |
| txq->trans_pcie = trans_pcie; |
| |
| txq->n_window = slots_num; |
| |
| txq->entries = calloc(slots_num, sizeof(struct iwl_pcie_txq_entry)); |
| |
| if (!txq->entries) { |
| goto error; |
| } |
| |
| if (cmd_queue) { |
| for (int i = 0; i < slots_num; i++) { |
| zx_status_t status = iwl_iobuf_allocate_contiguous( |
| &trans_pcie->pci_dev->dev, sizeof(struct iwl_device_cmd), &txq->entries[i].cmd); |
| if (status != ZX_OK) { |
| goto error; |
| } |
| } |
| } |
| |
| // Circular buffer of transmit frame descriptors (TFDs), shared with device. |
| zx_status_t status = iwl_iobuf_allocate_contiguous(&trans_pcie->pci_dev->dev, tfd_sz, &txq->tfds); |
| if (status != ZX_OK) { |
| goto error; |
| } |
| txq->dma_addr = iwl_iobuf_physical(txq->tfds); |
| |
| BUILD_BUG_ON(IWL_FIRST_TB_SIZE_ALIGN != sizeof(struct iwl_pcie_first_tb_buf)); |
| |
| size_t tb0_buf_sz = sizeof(struct iwl_pcie_first_tb_buf) * slots_num; |
| |
| status = |
| iwl_iobuf_allocate_contiguous(&trans_pcie->pci_dev->dev, tb0_buf_sz, &txq->first_tb_bufs); |
| if (status != ZX_OK) { |
| goto err_free_tfds; |
| } |
| |
| return ZX_OK; |
| |
| err_free_tfds: |
| iwl_iobuf_release(txq->tfds); |
| txq->tfds = NULL; |
| error: |
| if (txq->entries && cmd_queue) { |
| for (int i = 0; i < slots_num; i++) { |
| iwl_iobuf_release(txq->entries[i].cmd); |
| txq->entries[i].cmd = NULL; |
| } |
| } |
| free(txq->entries); |
| txq->entries = NULL; |
| |
| return ZX_ERR_NO_MEMORY; |
| } |
| |
| zx_status_t iwl_pcie_txq_init(struct iwl_trans* trans, struct iwl_txq* txq, uint16_t slots_num, |
| bool cmd_queue) { |
| uint32_t tfd_queue_max_size = trans->cfg->base_params->max_tfd_queue_size; |
| |
| txq->need_update = false; |
| |
| // max_tfd_queue_size must be power-of-two size, otherwise iwl_queue_inc_wrap and |
| // iwl_queue_dec_wrap are broken. |
| if (WARN_ON(tfd_queue_max_size & (tfd_queue_max_size - 1))) { |
| IWL_ERR(trans, "Max tfd queue size must be a power of two, but is %d", tfd_queue_max_size); |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| /* Initialize queue's high/low-water marks, and head/tail indexes */ |
| zx_status_t status = iwl_queue_init(txq, slots_num); |
| if (status != ZX_OK) { |
| return status; |
| } |
| |
| mtx_init(&txq->lock, mtx_plain); |
| |
| #if 0 // NEEDS_PORTING |
| if (cmd_queue) { |
| static struct lock_class_key iwl_pcie_cmd_queue_lock_class; |
| lockdep_set_class(&txq->lock, &iwl_pcie_cmd_queue_lock_class); |
| } |
| |
| __skb_queue_head_init(&txq->overflow_q); |
| #endif // NEEDS_PORTING |
| |
| return 0; |
| } |
| |
| #if 0 // NEEDS_PORTING |
| void iwl_pcie_free_tso_page(struct iwl_trans_pcie* trans_pcie, struct sk_buff* skb) { |
| struct page** page_ptr; |
| |
| page_ptr = (void*)((uint8_t*)skb->cb + trans_pcie->page_offs); |
| |
| if (*page_ptr) { |
| __free_page(*page_ptr); |
| *page_ptr = NULL; |
| } |
| } |
| #endif // NEEDS_PORTING |
| |
| static void iwl_pcie_clear_cmd_in_flight(struct iwl_trans* trans) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| |
| iwl_assert_lock_held(&trans_pcie->reg_lock); |
| |
| if (trans_pcie->ref_cmd_in_flight) { |
| trans_pcie->ref_cmd_in_flight = false; |
| IWL_DEBUG_RPM(trans, "clear ref_cmd_in_flight - unref\n"); |
| iwl_trans_unref(trans); |
| } |
| |
| if (!trans->cfg->base_params->apmg_wake_up_wa) { |
| return; |
| } |
| if (WARN_ON(!trans_pcie->cmd_hold_nic_awake)) { |
| return; |
| } |
| |
| trans_pcie->cmd_hold_nic_awake = false; |
| __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL, BIT(trans->cfg->csr->flag_mac_access_req)); |
| } |
| |
| // |
| // This function will traverse all remaining entries in a Tx queue. |
| // |
| // On the last entry, unref the device so that the power management code can put this device into |
| // power saving mode. In addition, for command queue, clear the ref_cmd_in_flight bit. |
| // |
| void iwl_pcie_txq_unmap(struct iwl_trans* trans, int txq_id) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[txq_id]; |
| |
| mtx_lock(&txq->lock); |
| while (txq->write_ptr != txq->read_ptr) { |
| IWL_DEBUG_TX_REPLY(trans, "Q %d Free %d\n", txq_id, txq->read_ptr); |
| |
| if (txq_id != trans_pcie->cmd_queue) { |
| #if 0 // NEEDS_PORTING |
| iwl_pcie_free_tso_page(trans_pcie, skb); |
| #endif // NEEDS_PORTING |
| } |
| iwl_pcie_txq_free_tfd(trans, txq); |
| txq->read_ptr = iwl_queue_inc_wrap(trans, txq->read_ptr); |
| |
| if (txq->read_ptr == txq->write_ptr) { |
| mtx_lock(&trans_pcie->reg_lock); |
| if (txq_id != trans_pcie->cmd_queue) { |
| IWL_DEBUG_RPM(trans, "Q %d - last tx freed\n", txq->id); |
| iwl_trans_unref(trans); |
| } else { |
| iwl_pcie_clear_cmd_in_flight(trans); |
| } |
| mtx_unlock(&trans_pcie->reg_lock); |
| } |
| } |
| |
| mtx_unlock(&txq->lock); |
| |
| /* just in case - this queue may have been stopped */ |
| iwl_wake_queue(trans, txq); |
| } |
| |
| /* |
| * iwl_pcie_txq_free - Deallocate DMA queue. |
| * @txq: Transmit queue to deallocate. |
| * |
| * Empty queue by removing and destroying all BD's. |
| * Free all buffers. |
| * 0-fill, but do not free "txq" descriptor structure. |
| */ |
| static void iwl_pcie_txq_free(struct iwl_trans* trans, int txq_id) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[txq_id]; |
| int i; |
| |
| if (WARN_ON(!txq)) { |
| return; |
| } |
| |
| iwl_pcie_txq_unmap(trans, txq_id); |
| |
| /* De-alloc array of command/tx buffers */ |
| if (txq_id == trans_pcie->cmd_queue) { |
| for (i = 0; i < txq->n_window; i++) { |
| iwl_iobuf_release(txq->entries[i].cmd); |
| txq->entries[i].cmd = NULL; |
| if (txq->entries[i].dup_io_buf) { |
| iwl_iobuf_release(txq->entries[i].dup_io_buf); |
| txq->entries[i].dup_io_buf = NULL; |
| } |
| } |
| } |
| |
| /* De-alloc circular buffer of TFDs */ |
| iwl_iobuf_release(txq->tfds); |
| txq->tfds = NULL; |
| txq->dma_addr = 0; |
| iwl_iobuf_release(txq->first_tb_bufs); |
| txq->first_tb_bufs = NULL; |
| |
| free(txq->entries); |
| txq->entries = NULL; |
| |
| iwl_irq_timer_release_sync(txq->stuck_timer); |
| txq->stuck_timer = NULL; |
| |
| /* 0-fill queue descriptor structure */ |
| memset(txq, 0, sizeof(*txq)); |
| } |
| |
| void iwl_pcie_tx_start(struct iwl_trans* trans, uint32_t scd_base_addr) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| int nq = trans->cfg->base_params->num_of_queues; |
| int chan; |
| uint32_t reg_val; |
| int clear_dwords = |
| (SCD_TRANS_TBL_OFFSET_QUEUE(nq) - SCD_CONTEXT_MEM_LOWER_BOUND) / sizeof(uint32_t); |
| |
| /* make sure all queue are not stopped/used */ |
| memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped)); |
| memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used)); |
| |
| trans_pcie->scd_base_addr = iwl_read_prph(trans, SCD_SRAM_BASE_ADDR); |
| |
| if (scd_base_addr != 0 && scd_base_addr != trans_pcie->scd_base_addr) { |
| IWL_WARN(trans, "iwl_pcie_tx_start(): expect scd_base_addr 0x%x, but actual 0x%x\n", |
| scd_base_addr, trans_pcie->scd_base_addr); |
| } |
| |
| /* reset context data, TX status and translation data */ |
| iwl_trans_write_mem(trans, trans_pcie->scd_base_addr + SCD_CONTEXT_MEM_LOWER_BOUND, NULL, |
| clear_dwords); |
| |
| iwl_write_prph(trans, SCD_DRAM_BASE_ADDR, trans_pcie->scd_bc_tbls.dma >> 10); |
| |
| /* The chain extension of the SCD doesn't work well. This feature is |
| * enabled by default by the HW, so we need to disable it manually. |
| */ |
| if (trans->cfg->base_params->scd_chain_ext_wa) { |
| iwl_write_prph(trans, SCD_CHAINEXT_EN, 0); |
| } |
| |
| iwl_trans_ac_txq_enable(trans, trans_pcie->cmd_queue, trans_pcie->cmd_fifo, |
| trans_pcie->cmd_q_wdg_timeout); |
| |
| /* Activate all Tx DMA/FIFO channels */ |
| iwl_scd_activate_fifos(trans); |
| |
| /* Enable DMA channel */ |
| for (chan = 0; chan < FH_TCSR_CHNL_NUM; chan++) |
| iwl_write_direct32( |
| trans, FH_TCSR_CHNL_TX_CONFIG_REG(chan), |
| FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE | FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE); |
| |
| /* Update FH chicken bits */ |
| reg_val = iwl_read_direct32(trans, FH_TX_CHICKEN_BITS_REG); |
| iwl_write_direct32(trans, FH_TX_CHICKEN_BITS_REG, reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN); |
| |
| /* Enable L1-Active */ |
| if (trans->cfg->device_family < IWL_DEVICE_FAMILY_8000) { |
| iwl_clear_bits_prph(trans, APMG_PCIDEV_STT_REG, APMG_PCIDEV_STT_VAL_L1_ACT_DIS); |
| } |
| } |
| |
| #if 0 // NEEDS_PORTING |
| void iwl_trans_pcie_tx_reset(struct iwl_trans* trans) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| int txq_id; |
| |
| /* |
| * we should never get here in gen2 trans mode return early to avoid |
| * having invalid accesses |
| */ |
| if (WARN_ON_ONCE(trans->cfg->gen2)) { return; } |
| |
| for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; txq_id++) { |
| struct iwl_txq* txq = trans_pcie->txq[txq_id]; |
| if (trans->cfg->use_tfh) { |
| iwl_write_direct64(trans, FH_MEM_CBBC_QUEUE(trans, txq_id), txq->dma_addr); |
| } else { |
| iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(trans, txq_id), txq->dma_addr >> 8); |
| } |
| iwl_pcie_txq_unmap(trans, txq_id); |
| txq->read_ptr = 0; |
| txq->write_ptr = 0; |
| } |
| |
| /* Tell NIC where to find the "keep warm" buffer */ |
| iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG, trans_pcie->kw.dma >> 4); |
| |
| /* |
| * Send 0 as the scd_base_addr since the device may have be reset |
| * while we were in WoWLAN in which case SCD_SRAM_BASE_ADDR will |
| * contain garbage. |
| */ |
| iwl_pcie_tx_start(trans, 0); |
| } |
| #endif // NEEDS_PORTING |
| |
| static void iwl_pcie_tx_stop_fh(struct iwl_trans* trans) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| unsigned long flags; |
| int ch, ret; |
| uint32_t mask = 0; |
| |
| mtx_lock(&trans_pcie->irq_lock); |
| |
| if (!iwl_trans_grab_nic_access(trans, &flags)) { |
| goto out; |
| } |
| |
| /* Stop each Tx DMA channel */ |
| for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) { |
| iwl_write32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0); |
| mask |= FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch); |
| } |
| |
| /* Wait for DMA channels to be idle */ |
| ret = iwl_poll_bit(trans, FH_TSSR_TX_STATUS_REG, mask, mask, ZX_MSEC(5), NULL); |
| if (ret != ZX_OK) { |
| IWL_ERR(trans, "Failing on timeout while stopping DMA channel %d [0x%08x]\n", ch, |
| iwl_read32(trans, FH_TSSR_TX_STATUS_REG)); |
| } |
| |
| iwl_trans_release_nic_access(trans, &flags); |
| |
| out: |
| mtx_unlock(&trans_pcie->irq_lock); |
| } |
| |
| /* |
| * iwl_pcie_tx_stop - Stop all Tx DMA channels |
| */ |
| zx_status_t iwl_pcie_tx_stop(struct iwl_trans* trans) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| int txq_id; |
| |
| /* Turn off all Tx DMA fifos */ |
| iwl_scd_deactivate_fifos(trans); |
| |
| /* Turn off all Tx DMA channels */ |
| iwl_pcie_tx_stop_fh(trans); |
| |
| /* |
| * This function can be called before the op_mode disabled the |
| * queues. This happens when we have an rfkill interrupt. |
| * Since we stop Tx altogether - mark the queues as stopped. |
| */ |
| memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped)); |
| memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used)); |
| |
| /* This can happen: start_hw, stop_device */ |
| if (!trans_pcie->txq_memory) { |
| return ZX_OK; |
| } |
| |
| /* Unmap DMA from host system and free skb's */ |
| for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; txq_id++) { |
| iwl_pcie_txq_unmap(trans, txq_id); |
| } |
| |
| return ZX_OK; |
| } |
| |
| /* |
| * iwl_trans_tx_free - Free TXQ Context |
| * |
| * Destroy all TX DMA queues and structures |
| */ |
| void iwl_pcie_tx_free(struct iwl_trans* trans) { |
| int txq_id; |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| |
| memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used)); |
| |
| /* Tx queues */ |
| if (trans_pcie->txq_memory) { |
| for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; txq_id++) { |
| iwl_pcie_txq_free(trans, txq_id); |
| trans_pcie->txq[txq_id] = NULL; |
| } |
| } |
| |
| free(trans_pcie->txq_memory); |
| trans_pcie->txq_memory = NULL; |
| |
| iwl_pcie_free_dma_ptr(trans, &trans_pcie->kw); |
| |
| iwl_pcie_free_dma_ptr(trans, &trans_pcie->scd_bc_tbls); |
| } |
| |
| /* |
| * iwl_pcie_tx_alloc - allocate TX context |
| * Allocate all Tx DMA structures and initialize them |
| */ |
| static zx_status_t iwl_pcie_tx_alloc(struct iwl_trans* trans) { |
| zx_status_t ret; |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| uint16_t bc_tbls_size = trans->cfg->base_params->num_of_queues; |
| |
| bc_tbls_size *= (trans->cfg->device_family >= IWL_DEVICE_FAMILY_22560) |
| ? sizeof(struct iwl_gen3_bc_tbl) |
| : sizeof(struct iwlagn_scd_bc_tbl); |
| |
| /*It is not allowed to alloc twice, so warn when this happens. |
| * We cannot rely on the previous allocation, so free and fail */ |
| if (WARN_ON(trans_pcie->txq_memory)) { |
| ret = ZX_ERR_BAD_STATE; |
| goto error; |
| } |
| |
| ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->scd_bc_tbls, bc_tbls_size); |
| if (ret != ZX_OK) { |
| IWL_ERR(trans, "Scheduler BC Table allocation failed\n"); |
| goto error; |
| } |
| |
| /* Alloc keep-warm buffer */ |
| ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->kw, IWL_KW_SIZE); |
| if (ret != ZX_OK) { |
| IWL_ERR(trans, "Keep Warm allocation failed\n"); |
| goto error; |
| } |
| |
| trans_pcie->txq_memory = calloc(trans->cfg->base_params->num_of_queues, sizeof(struct iwl_txq)); |
| if (!trans_pcie->txq_memory) { |
| IWL_ERR(trans, "Not enough memory for txq\n"); |
| ret = ZX_ERR_NO_MEMORY; |
| goto error; |
| } |
| |
| /* Alloc and init all Tx queues, including the command queue (#4/#9) */ |
| for (int txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; txq_id++) { |
| bool cmd_queue = (txq_id == trans_pcie->cmd_queue); |
| |
| int slots_num = cmd_queue ? TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS; |
| trans_pcie->txq[txq_id] = &trans_pcie->txq_memory[txq_id]; |
| ret = iwl_pcie_txq_alloc(trans, trans_pcie->txq[txq_id], slots_num, cmd_queue); |
| if (ret != ZX_OK) { |
| IWL_ERR(trans, "Tx %d queue alloc failed\n", txq_id); |
| goto error; |
| } |
| trans_pcie->txq[txq_id]->id = txq_id; |
| } |
| |
| return ZX_OK; |
| |
| error: |
| iwl_pcie_tx_free(trans); |
| return ret; |
| } |
| |
| zx_status_t iwl_pcie_tx_init(struct iwl_trans* trans) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| int ret; |
| bool alloc = false; |
| |
| if (!trans_pcie->txq_memory) { |
| ret = iwl_pcie_tx_alloc(trans); |
| if (ret) { |
| goto error; |
| } |
| alloc = true; |
| } |
| |
| mtx_lock(&trans_pcie->irq_lock); |
| |
| /* Turn off all Tx DMA fifos */ |
| iwl_scd_deactivate_fifos(trans); |
| |
| /* Tell NIC where to find the "keep warm" buffer */ |
| iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG, trans_pcie->kw.dma >> 4); |
| |
| mtx_unlock(&trans_pcie->irq_lock); |
| |
| /* Alloc and init all Tx queues, including the command queue (#4/#9) */ |
| for (int txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues; txq_id++) { |
| bool cmd_queue = (txq_id == trans_pcie->cmd_queue); |
| |
| int slots_num = cmd_queue ? TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS; |
| ret = iwl_pcie_txq_init(trans, trans_pcie->txq[txq_id], slots_num, cmd_queue); |
| if (ret != ZX_OK) { |
| IWL_ERR(trans, "Tx %d queue init failed\n", txq_id); |
| goto error; |
| } |
| |
| /* |
| * Tell nic where to find circular buffer of TFDs for a |
| * given Tx queue, and enable the DMA channel used for that |
| * queue. |
| * Circular buffer (TFD queue in DRAM) physical base address |
| */ |
| iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(trans, txq_id), |
| trans_pcie->txq[txq_id]->dma_addr >> 8); |
| } |
| |
| iwl_set_bits_prph(trans, SCD_GP_CTRL, SCD_GP_CTRL_AUTO_ACTIVE_MODE); |
| if (trans->cfg->base_params->num_of_queues > 20) { |
| iwl_set_bits_prph(trans, SCD_GP_CTRL, SCD_GP_CTRL_ENABLE_31_QUEUES); |
| } |
| |
| return ZX_OK; |
| error: |
| /*Upon error, free only if we allocated something */ |
| if (alloc) { |
| iwl_pcie_tx_free(trans); |
| } |
| return ret; |
| } |
| |
| static inline void iwl_pcie_txq_progress(struct iwl_txq* txq) { |
| iwl_assert_lock_held(&txq->lock); |
| |
| if (!txq->wd_timeout) { |
| return; |
| } |
| |
| /* |
| * station is asleep and we send data - that must |
| * be uAPSD or PS-Poll. Don't rearm the timer. |
| */ |
| if (txq->frozen) { |
| return; |
| } |
| |
| /* |
| * if empty delete timer, otherwise move timer forward |
| * since we're making progress on this queue |
| */ |
| if (txq->read_ptr == txq->write_ptr) { |
| iwl_irq_timer_stop(txq->stuck_timer); |
| } else { |
| iwl_irq_timer_start(txq->stuck_timer, txq->wd_timeout); |
| } |
| } |
| |
| /* Frees buffers until index _not_ inclusive */ |
| void iwl_trans_pcie_reclaim(struct iwl_trans* trans, int txq_id, int ssn) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[txq_id]; |
| int tfd_num = iwl_pcie_get_cmd_index(txq, ssn); |
| int read_ptr = iwl_pcie_get_cmd_index(txq, txq->read_ptr); |
| int last_to_free; |
| |
| /* This function is not meant to release cmd queue */ |
| if (txq_id == trans_pcie->cmd_queue) { |
| IWL_WARN(trans, "iwl_trans_pcie_reclaim() is not meant to release cmd queue.\n"); |
| return; |
| } |
| |
| mtx_lock(&txq->lock); |
| |
| if (!test_bit(txq_id, trans_pcie->queue_used)) { |
| IWL_DEBUG_TX_QUEUES(trans, "Q %d inactive - ignoring idx %d\n", txq_id, ssn); |
| goto out; |
| } |
| |
| if (read_ptr == tfd_num) { |
| goto out; |
| } |
| |
| IWL_DEBUG_TX_REPLY(trans, "[Q %d] %d -> %d (%d)\n", txq_id, txq->read_ptr, tfd_num, ssn); |
| |
| /*Since we free until index _not_ inclusive, the one before index is |
| * the last we will free. This one must be used */ |
| last_to_free = iwl_queue_dec_wrap(trans, tfd_num); |
| |
| if (!iwl_queue_used(txq, last_to_free)) { |
| IWL_ERR(trans, |
| "%s: Read index for txq id (%d), last_to_free %d is out of range [0-%d] %d %d.\n", |
| __func__, txq_id, last_to_free, trans->cfg->base_params->max_tfd_queue_size, |
| txq->write_ptr, txq->read_ptr); |
| goto out; |
| } |
| |
| #if 0 // NEEDS_PORTING |
| if (WARN_ON(!skb_queue_empty(skbs))) { goto out; } |
| #endif // NEEDS_PORTING |
| |
| for (; read_ptr != tfd_num; txq->read_ptr = iwl_queue_inc_wrap(trans, txq->read_ptr), |
| read_ptr = iwl_pcie_get_cmd_index(txq, txq->read_ptr)) { |
| #if 0 // NEEDS_PORTING |
| if (!trans->cfg->use_tfh) { iwl_pcie_txq_inval_byte_cnt_tbl(trans, txq); } |
| #endif // NEEDS_PORTING |
| |
| ZX_ASSERT(txq->entries[read_ptr].cmd); |
| iwl_iobuf_release(txq->entries[read_ptr].cmd); |
| txq->entries[read_ptr].cmd = NULL; |
| if (txq->entries[read_ptr].dup_io_buf) { |
| iwl_iobuf_release(txq->entries[read_ptr].dup_io_buf); |
| txq->entries[read_ptr].dup_io_buf = NULL; |
| } |
| |
| iwl_pcie_txq_free_tfd(trans, txq); |
| } |
| |
| iwl_pcie_txq_progress(txq); |
| |
| #if 1 // NEEDS_PORTING |
| if (iwl_queue_space(trans, txq) > txq->low_mark && test_bit(txq_id, trans_pcie->queue_stopped)) { |
| iwl_wake_queue(trans, txq); |
| } |
| #else // NEEDS_PORTING |
| if (iwl_queue_space(trans, txq) > txq->low_mark && test_bit(txq_id, trans_pcie->queue_stopped)) { |
| struct sk_buff_head overflow_skbs; |
| |
| __skb_queue_head_init(&overflow_skbs); |
| skb_queue_splice_init(&txq->overflow_q, &overflow_skbs); |
| |
| /* |
| * This is tricky: we are in reclaim path which is non |
| * re-entrant, so noone will try to take the access the |
| * txq data from that path. We stopped tx, so we can't |
| * have tx as well. Bottom line, we can unlock and re-lock |
| * later. |
| */ |
| spin_unlock_bh(&txq->lock); |
| |
| while (!skb_queue_empty(&overflow_skbs)) { |
| struct sk_buff* skb = __skb_dequeue(&overflow_skbs); |
| struct iwl_device_cmd* dev_cmd_ptr; |
| |
| dev_cmd_ptr = *(void**)((uint8_t*)skb->cb + trans_pcie->dev_cmd_offs); |
| |
| /* |
| * Note that we can very well be overflowing again. |
| * In that case, iwl_queue_space will be small again |
| * and we won't wake mac80211's queue. |
| */ |
| iwl_trans_tx(trans, skb, dev_cmd_ptr, txq_id); |
| } |
| |
| if (iwl_queue_space(trans, txq) > txq->low_mark) { |
| iwl_wake_queue(trans, txq); |
| } |
| |
| spin_lock_bh(&txq->lock); |
| } |
| #endif // NEEDS_PORTING |
| |
| if (txq->read_ptr == txq->write_ptr) { |
| IWL_DEBUG_RPM(trans, "Q %d - last tx reclaimed\n", txq->id); |
| iwl_trans_unref(trans); |
| } |
| |
| out: |
| mtx_unlock(&txq->lock); |
| } |
| |
| static zx_status_t iwl_pcie_set_cmd_in_flight(struct iwl_trans* trans, |
| const struct iwl_host_cmd* cmd) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| const struct iwl_cfg* cfg = trans->cfg; |
| |
| iwl_assert_lock_held(&trans_pcie->reg_lock); |
| |
| /* Make sure the NIC is still alive in the bus */ |
| if (test_bit(STATUS_TRANS_DEAD, &trans->status)) { |
| return ZX_ERR_BAD_STATE; |
| } |
| |
| if (!(cmd->flags & CMD_SEND_IN_IDLE) && !trans_pcie->ref_cmd_in_flight) { |
| trans_pcie->ref_cmd_in_flight = true; |
| IWL_DEBUG_RPM(trans, "set ref_cmd_in_flight - ref\n"); |
| iwl_trans_ref(trans); |
| } |
| |
| /* |
| * wake up the NIC to make sure that the firmware will see the host |
| * command - we will let the NIC sleep once all the host commands |
| * returned. This needs to be done only on NICs that have |
| * apmg_wake_up_wa set. |
| */ |
| if (cfg->base_params->apmg_wake_up_wa && !trans_pcie->cmd_hold_nic_awake) { |
| __iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL, BIT(cfg->csr->flag_mac_access_req)); |
| |
| zx_status_t status = |
| iwl_poll_bit(trans, CSR_GP_CNTRL, BIT(cfg->csr->flag_val_mac_access_en), |
| (BIT(cfg->csr->flag_mac_clock_ready) | CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), |
| ZX_MSEC(15), NULL); |
| if (status != ZX_OK) { |
| __iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL, BIT(cfg->csr->flag_mac_access_req)); |
| IWL_ERR(trans, "Failed to wake NIC for hcmd\n"); |
| return ZX_ERR_IO; |
| } |
| trans_pcie->cmd_hold_nic_awake = true; |
| } |
| |
| return ZX_OK; |
| } |
| |
| /* |
| * iwl_pcie_cmdq_reclaim - Reclaim TX command queue entries already Tx'd |
| * |
| * When FW advances 'R' index, all entries between old and new 'R' index |
| * need to be reclaimed. As result, some free space forms. If there is |
| * enough free space (> low mark), wake the stack that feeds us. |
| */ |
| zx_status_t iwl_pcie_cmdq_reclaim(struct iwl_trans* trans, int txq_id, uint32_t idx) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[txq_id]; |
| int nfreed = 0; |
| |
| // Ensure the tx_id is pointing to the cmd_queue. |
| if (txq_id != trans_pcie->cmd_queue) { |
| IWL_WARN(trans, "wrong command queue %d (should be %d)\n", txq_id, trans_pcie->cmd_queue); |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| iwl_assert_lock_held(&txq->lock); |
| |
| idx = iwl_pcie_get_cmd_index(txq, idx); |
| uint16_t r = iwl_pcie_get_cmd_index(txq, txq->read_ptr); |
| |
| if (idx >= trans->cfg->base_params->max_tfd_queue_size || (!iwl_queue_used(txq, idx))) { |
| if (test_bit(txq_id, trans_pcie->queue_used)) { |
| IWL_WARN(trans, "DMA queue txq_id (%d), read index %d is out of range [0-%d] wp:%d rp:%d\n", |
| txq_id, idx, trans->cfg->base_params->max_tfd_queue_size, txq->write_ptr, |
| txq->read_ptr); |
| } |
| return ZX_ERR_OUT_OF_RANGE; |
| } |
| |
| for (idx = iwl_queue_inc_wrap(trans, idx); r != idx; r = iwl_queue_inc_wrap(trans, r)) { |
| txq->read_ptr = iwl_queue_inc_wrap(trans, txq->read_ptr); |
| |
| if (nfreed++ > 0) { |
| IWL_ERR(trans, "HCMD skipped: index (%d) %d %d\n", idx, txq->write_ptr, r); |
| iwl_force_nmi(trans); |
| return ZX_ERR_BAD_STATE; |
| } |
| } |
| |
| if (txq->read_ptr == txq->write_ptr) { |
| mtx_lock(&trans_pcie->reg_lock); |
| iwl_pcie_clear_cmd_in_flight(trans); |
| mtx_unlock(&trans_pcie->reg_lock); |
| } |
| |
| iwl_pcie_txq_progress(txq); |
| return ZX_OK; |
| } |
| |
| static int iwl_pcie_txq_set_ratid_map(struct iwl_trans* trans, uint16_t ra_tid, uint16_t txq_id) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| uint32_t tbl_dw_addr; |
| uint32_t tbl_dw; |
| uint16_t scd_q2ratid; |
| |
| scd_q2ratid = ra_tid & SCD_QUEUE_RA_TID_MAP_RATID_MSK; |
| |
| tbl_dw_addr = trans_pcie->scd_base_addr + SCD_TRANS_TBL_OFFSET_QUEUE(txq_id); |
| |
| tbl_dw = iwl_trans_read_mem32(trans, tbl_dw_addr); |
| |
| if (txq_id & 0x1) { |
| tbl_dw = (scd_q2ratid << 16) | (tbl_dw & 0x0000FFFF); |
| } else { |
| tbl_dw = scd_q2ratid | (tbl_dw & 0xFFFF0000); |
| } |
| |
| iwl_trans_write_mem32(trans, tbl_dw_addr, tbl_dw); |
| |
| return 0; |
| } |
| |
| /* Receiver address (actually, Rx station's index into station table), |
| * combined with Traffic ID (QOS priority), in format used by Tx Scheduler */ |
| #define BUILD_RAxTID(sta_id, tid) (((sta_id) << 4) + (tid)) |
| |
| bool iwl_trans_pcie_txq_enable(struct iwl_trans* trans, int txq_id, uint16_t ssn, |
| const struct iwl_trans_txq_scd_cfg* cfg, zx_duration_t wdg_timeout) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[txq_id]; |
| int fifo = -1; |
| bool scd_bug = false; |
| |
| if (test_and_set_bit(txq_id, trans_pcie->queue_used)) { |
| IWL_WARN(trans, "queue %d already used - expect issues\n", txq_id); |
| } |
| |
| txq->wd_timeout = wdg_timeout; |
| |
| if (cfg) { |
| fifo = cfg->fifo; |
| |
| /* Disable the scheduler prior configuring the cmd queue */ |
| if (txq_id == trans_pcie->cmd_queue && trans_pcie->scd_set_active) { |
| iwl_scd_enable_set_active(trans, 0); |
| } |
| |
| /* Stop this Tx queue before configuring it */ |
| iwl_scd_txq_set_inactive(trans, txq_id); |
| |
| /* Set this queue as a chain-building queue unless it is CMD */ |
| if (txq_id != trans_pcie->cmd_queue) { |
| iwl_scd_txq_set_chain(trans, txq_id); |
| } |
| |
| if (cfg->aggregate) { |
| uint16_t ra_tid = BUILD_RAxTID(cfg->sta_id, cfg->tid); |
| |
| /* Map receiver-address / traffic-ID to this queue */ |
| iwl_pcie_txq_set_ratid_map(trans, ra_tid, txq_id); |
| |
| /* enable aggregations for the queue */ |
| iwl_scd_txq_enable_agg(trans, txq_id); |
| txq->ampdu = true; |
| } else { |
| /* |
| * disable aggregations for the queue, this will also |
| * make the ra_tid mapping configuration irrelevant |
| * since it is now a non-AGG queue. |
| */ |
| iwl_scd_txq_disable_agg(trans, txq_id); |
| |
| ssn = txq->read_ptr; |
| } |
| } else { |
| /* |
| * If we need to move the SCD write pointer by steps of |
| * 0x40, 0x80 or 0xc0, it gets stuck. Avoids this and let |
| * the op_mode know by returning true later. |
| * Do this only in case cfg is NULL since this trick can |
| * be done only if we have DQA enabled which is true for mvm |
| * only. And mvm never sets a cfg pointer. |
| * This is really ugly, but this is the easiest way out for |
| * this sad hardware issue. |
| * This bug has been fixed on devices 9000 and up. |
| */ |
| scd_bug = |
| !trans->cfg->mq_rx_supported && !((ssn - txq->write_ptr) & 0x3f) && (ssn != txq->write_ptr); |
| if (scd_bug) { |
| ssn++; |
| } |
| } |
| |
| /* Place first TFD at index corresponding to start sequence number. |
| * Assumes that ssn_idx is valid (!= 0xFFF) */ |
| txq->read_ptr = (ssn & 0xff); |
| txq->write_ptr = (ssn & 0xff); |
| iwl_write_direct32(trans, HBUS_TARG_WRPTR, (ssn & 0xff) | (txq_id << 8)); |
| |
| if (cfg) { |
| uint8_t frame_limit = cfg->frame_limit; |
| |
| iwl_write_prph(trans, SCD_QUEUE_RDPTR(txq_id), ssn); |
| |
| /* Set up Tx window size and frame limit for this queue */ |
| iwl_trans_write_mem32(trans, trans_pcie->scd_base_addr + SCD_CONTEXT_QUEUE_OFFSET(txq_id), 0); |
| iwl_trans_write_mem32( |
| trans, trans_pcie->scd_base_addr + SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(uint32_t), |
| SCD_QUEUE_CTX_REG2_VAL(WIN_SIZE, frame_limit) | |
| SCD_QUEUE_CTX_REG2_VAL(FRAME_LIMIT, frame_limit)); |
| |
| /* Set up status area in SRAM, map to Tx DMA/FIFO, activate */ |
| iwl_write_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id), |
| (1 << SCD_QUEUE_STTS_REG_POS_ACTIVE) | |
| (cfg->fifo << SCD_QUEUE_STTS_REG_POS_TXF) | |
| (1 << SCD_QUEUE_STTS_REG_POS_WSL) | SCD_QUEUE_STTS_REG_MSK); |
| |
| /* enable the scheduler for this queue (only) */ |
| if (txq_id == trans_pcie->cmd_queue && trans_pcie->scd_set_active) { |
| iwl_scd_enable_set_active(trans, BIT(txq_id)); |
| } |
| |
| IWL_DEBUG_TX_QUEUES(trans, "Activate queue %d on FIFO %d WrPtr: %d\n", txq_id, fifo, |
| ssn & 0xff); |
| } else { |
| IWL_DEBUG_TX_QUEUES(trans, "Activate queue %d WrPtr: %d\n", txq_id, ssn & 0xff); |
| } |
| |
| return scd_bug; |
| } |
| |
| void iwl_trans_pcie_txq_set_shared_mode(struct iwl_trans* trans, uint32_t txq_id, |
| bool shared_mode) { |
| #if 0 // NEEDS_PORTING |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[txq_id]; |
| |
| txq->ampdu = !shared_mode; |
| #endif // NEEDS_PORTING |
| IWL_ERR(trans, "%s needs porting\n", __FUNCTION__); |
| } |
| |
| void iwl_trans_pcie_txq_disable(struct iwl_trans* trans, int txq_id, bool configure_scd) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| uint32_t stts_addr = trans_pcie->scd_base_addr + SCD_TX_STTS_QUEUE_OFFSET(txq_id); |
| static const uint32_t zero_val[4] = {}; |
| |
| trans_pcie->txq[txq_id]->frozen_expiry_remainder = 0; |
| trans_pcie->txq[txq_id]->frozen = false; |
| |
| /* |
| * Upon HW Rfkill - we stop the device, and then stop the queues |
| * in the op_mode. Just for the sake of the simplicity of the op_mode, |
| * allow the op_mode to call txq_disable after it already called |
| * stop_device. |
| */ |
| if (!test_and_clear_bit(txq_id, trans_pcie->queue_used)) { |
| if (test_bit(STATUS_DEVICE_ENABLED, &trans->status)) { |
| IWL_ERR(trans, "queue %d not used", txq_id); |
| } |
| return; |
| } |
| |
| if (configure_scd) { |
| iwl_scd_txq_set_inactive(trans, txq_id); |
| |
| zx_status_t ret = iwl_trans_write_mem(trans, stts_addr, (void*)zero_val, ARRAY_SIZE(zero_val)); |
| if (ret != ZX_OK) { |
| IWL_ERR(trans, "cannot write memory while disable TxQ: %s\n", zx_status_get_string(ret)); |
| } |
| } |
| |
| iwl_pcie_txq_unmap(trans, txq_id); |
| trans_pcie->txq[txq_id]->ampdu = false; |
| |
| IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", txq_id); |
| } |
| |
| /*************** HOST COMMAND QUEUE FUNCTIONS *****/ |
| |
| // |
| // iwl_pcie_enqueue_hcmd - enqueue a uCode command |
| // |
| // @priv: device private data point |
| // @cmd: a pointer to the ucode command structure |
| // |
| // Below is how a Tx host command is built: |
| // |
| // A host command from MVM can contain 2 data framgents: |
| // |
| // - The first fragment must contain the command header including command ID, length ... etc. |
| // It may not contain the payload since it can be passed in the second fragment. |
| // |
| // - The second fragment is optional. Usually it is used for different flags from the first |
| // fragment. For example, copying a host command with very large payload has performance |
| // concern. Then the first fragment can only contain the command header while the second |
| // fragment can contain its large payload with NOCOPY flag. |
| // |
| // So, down to the transport layer, a host command can be re-mapped to multiple descriptors in order |
| // to satisfy the upper layer's demand. This is why TFD (Transmit Frame Descriptor) is introduced. |
| // |
| // txq->tfds[] (TFDs) are used by driver to indicate the data fragements for firmware. A host |
| // command can be re-mapped into 1~3 descriptors depending on the fragment lengths and flags |
| // (check how the iwl_pcie_txq_build_tfd() is called in this function): |
| // |
| // - For small-sized command (<= 20 bytes): |
| // |
| // At driver initialization time, it already allocated a special buffer (txq->first_tb_bufs[], |
| // also called 'tb0' in this function) for small host commands. |
| // |
| // For these commands, no memory mapping is required, and just copy the whole command to the |
| // buffer. Note that each entry in this buffer must be 64-byte aligned although only the first |
| // 20-byte is used. |
| // |
| // <-- 20-B --> |
| // +------------+ |
| // | tb0 | |
| // +------------+ |
| // |
| // |
| // - For medium-sized command (20 < len <= 328 bytes): |
| // |
| // The first 20-byte still goes to 'tb0'. The remaining content will be mapped into the second |
| // descriptor -- the 'cmd' iwl_iobuf in 'struct iwl_pcie_txq_entry'. |
| // |
| // <----------- 20 ~ 328 bytes -----------> |
| // +------------+ +----------------------------+ |
| // | tb0 | | 2nd descriptor ('cmd') | |
| // +------------+ +----------------------------+ |
| // 1st fragment (or with the 2nd fragment) |
| // |
| // |
| // - For large-sized command (> 328 bytes): |
| // |
| // It cannot be fit within one fragment (seems a hardware issue?). The second fragment must be |
| // marked with NOCOPY flag (observed from the code using this function). |
| // |
| // + If first fragment is smaller than or equal to 20-byte, then 2 descriptors will be built. |
| // The first descriptor points to the first fragment while the second descriptor points to |
| // second fragment -- the 'dup_io_buf' in 'struct iwl_pcie_txq_entry'. |
| // |
| // <-- 20-B --> <--------- any length ----------> |
| // +------------+ +-----------------------------------+ |
| // | tb0 | | 2nd descriptor ('dup_io_buf') | |
| // +------------+ +-----------------------------------+ |
| // 1st fragment 2nd fragment (NOCOPY) |
| // |
| // |
| // + If the first fragment is larger than 20-byte, similar as the medium-sized command, the |
| // first fragment will be split into 2 descriptos: 'tb0' and 'cmd' iwl_iobuf. However, the |
| // second fragment (with the NOCOPY flag) will be stored in 3rd descriptor. |
| // |
| // <----------- 20 ~ 328 bytes -----------> <--------- any length ----------> |
| // +------------+ +----------------------------+ +-----------------------------------+ |
| // | tb0 | | 2nd descriptor ('cmd') | | 3rd descriptor ('dup_io_buf') | |
| // +------------+ +----------------------------+ +-----------------------------------+ |
| // 1st fragment 2nd fragment (NOCOPY) |
| // |
| static zx_status_t iwl_pcie_enqueue_hcmd(struct iwl_trans* trans, struct iwl_host_cmd* cmd, |
| int* cmd_idx_out) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[trans_pcie->cmd_queue]; |
| struct iwl_cmd_meta* out_meta; |
| bool had_dup_flag = false; |
| uint16_t copy_size; // The size to copy into allocated DMA area (without the NOCOPY data). |
| uint16_t cmd_size; // Whole command size writing to HW, including header and data. |
| bool had_nocopy = false; |
| uint8_t group_id = iwl_cmd_groupid(cmd->id); |
| const uint8_t* cmddata[IWL_MAX_CMD_TBS_PER_TFD]; |
| uint16_t cmdlen[IWL_MAX_CMD_TBS_PER_TFD]; // Locally manipulated data lengths. |
| zx_status_t status = ZX_OK; |
| |
| if (!trans->wide_cmd_header && group_id > IWL_ALWAYS_LONG_GROUP) { |
| IWL_WARN(trans, "unsupported wide command %#x\n", cmd->id); |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| if (group_id != 0) { |
| copy_size = sizeof(struct iwl_cmd_header_wide); |
| cmd_size = sizeof(struct iwl_cmd_header_wide); |
| } else { |
| copy_size = sizeof(struct iwl_cmd_header); |
| cmd_size = sizeof(struct iwl_cmd_header); |
| } |
| |
| /* need one for the header if the first is NOCOPY */ |
| BUILD_BUG_ON(IWL_MAX_CMD_TBS_PER_TFD > IWL_NUM_OF_TBS - 1); |
| |
| for (int i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) { |
| cmddata[i] = cmd->data[i]; |
| cmdlen[i] = cmd->len[i]; |
| |
| if (!cmd->len[i]) { |
| continue; |
| } |
| |
| /* need at least IWL_FIRST_TB_SIZE copied */ |
| if (copy_size < IWL_FIRST_TB_SIZE) { |
| int copy = IWL_FIRST_TB_SIZE - copy_size; |
| |
| if (copy > cmdlen[i]) { |
| copy = cmdlen[i]; |
| } |
| cmdlen[i] -= copy; |
| cmddata[i] += copy; |
| copy_size += copy; |
| } |
| |
| if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) { |
| had_nocopy = true; |
| if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| } else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) { |
| /* |
| * This is also a chunk that isn't copied |
| * to the static buffer so set had_nocopy. |
| */ |
| had_nocopy = true; |
| |
| /* only allowed once */ |
| if (WARN_ON(had_dup_flag)) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| had_dup_flag = true; |
| } else { |
| /* NOCOPY must not be followed by normal! */ |
| if (WARN_ON(had_nocopy)) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| copy_size += cmdlen[i]; |
| } |
| cmd_size += cmd->len[i]; |
| } |
| |
| /* |
| * If any of the command structures end up being larger than |
| * the TFD_MAX_PAYLOAD_SIZE and they aren't dynamically |
| * allocated into separate TFDs, then we will need to |
| * increase the size of the buffers. |
| */ |
| if (copy_size > TFD_MAX_PAYLOAD_SIZE) { |
| IWL_WARN(trans, "Command %s (%#x) is too large (%d bytes, expect <= %lu bytes)\n", |
| iwl_get_cmd_string(trans, cmd->id), cmd->id, copy_size, TFD_MAX_PAYLOAD_SIZE); |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| mtx_lock(&txq->lock); |
| |
| if (iwl_queue_space(trans, txq) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) { |
| mtx_unlock(&txq->lock); |
| IWL_ERR(trans, "No space in command queue\n"); |
| iwl_op_mode_cmd_queue_full(trans->op_mode); |
| return ZX_ERR_NO_RESOURCES; |
| } |
| |
| int cmd_idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr); |
| struct iwl_device_cmd* out_cmd = iwl_iobuf_virtual(txq->entries[cmd_idx].cmd); |
| zx_paddr_t phys_addr = iwl_iobuf_physical(txq->entries[cmd_idx].cmd); |
| out_meta = &txq->entries[cmd_idx].meta; |
| |
| memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */ |
| if (cmd->flags & CMD_WANT_SKB) { |
| out_meta->source = cmd; |
| } |
| |
| /* set up the header */ |
| uint32_t cmd_pos; // Pointer used with 'out_cmd' to indicate the location for 'next copy data'. |
| if (group_id != 0) { |
| out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id); |
| out_cmd->hdr_wide.group_id = group_id; |
| out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id); |
| out_cmd->hdr_wide.length = cpu_to_le16(cmd_size - sizeof(struct iwl_cmd_header_wide)); |
| out_cmd->hdr_wide.reserved = 0; |
| out_cmd->hdr_wide.sequence = |
| cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) | INDEX_TO_SEQ(txq->write_ptr)); |
| |
| cmd_pos = sizeof(struct iwl_cmd_header_wide); |
| copy_size = sizeof(struct iwl_cmd_header_wide); |
| } else { |
| out_cmd->hdr.cmd = iwl_cmd_opcode(cmd->id); |
| out_cmd->hdr.sequence = |
| cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) | INDEX_TO_SEQ(txq->write_ptr)); |
| out_cmd->hdr.group_id = 0; |
| |
| cmd_pos = sizeof(struct iwl_cmd_header); |
| copy_size = sizeof(struct iwl_cmd_header); |
| } |
| |
| /* and copy the data that needs to be copied */ |
| for (int i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) { |
| int copy; |
| |
| if (!cmd->len[i]) { |
| continue; |
| } |
| |
| /* copy everything if not nocopy/dup */ |
| if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY | IWL_HCMD_DFL_DUP))) { |
| copy = cmd->len[i]; |
| |
| memcpy((uint8_t*)out_cmd + cmd_pos, cmd->data[i], copy); |
| cmd_pos += copy; |
| copy_size += copy; |
| continue; |
| } |
| |
| /* |
| * Otherwise we need at least IWL_FIRST_TB_SIZE copied |
| * in total (for bi-directional DMA), but copy up to what |
| * we can fit into the payload for debug dump purposes. |
| * TODO(43084): Remove the un-necessary memcpy below. |
| */ |
| copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]); |
| memcpy((uint8_t*)out_cmd + cmd_pos, cmd->data[i], copy); |
| cmd_pos += copy; |
| |
| /* However, treat copy_size the proper way, we need it below */ |
| if (copy_size < IWL_FIRST_TB_SIZE) { |
| copy = IWL_FIRST_TB_SIZE - copy_size; |
| |
| if (copy > cmd->len[i]) { |
| copy = cmd->len[i]; |
| } |
| copy_size += copy; |
| } |
| } |
| |
| IWL_DEBUG_HC(trans, "Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n", |
| iwl_get_cmd_string(trans, cmd->id), group_id, out_cmd->hdr.cmd, |
| le16_to_cpu(out_cmd->hdr.sequence), cmd_size, txq->write_ptr, cmd_idx, |
| trans_pcie->cmd_queue); |
| |
| // start the TFD with the minimum copy bytes (tb0). |
| struct iwl_pcie_first_tb_buf* tb_bufs = iwl_iobuf_virtual(txq->first_tb_bufs); |
| uint16_t tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE); |
| memcpy(&tb_bufs[cmd_idx], &out_cmd->hdr, tb0_size); |
| uint32_t num_tbs; |
| iwl_pcie_txq_build_tfd(trans, txq, iwl_pcie_get_first_tb_dma(txq, cmd_idx), tb0_size, true, |
| &num_tbs); |
| |
| /* map first command fragment, if any remains */ |
| if (copy_size > tb0_size) { |
| iwl_pcie_txq_build_tfd(trans, txq, phys_addr + tb0_size, copy_size - tb0_size, false, &num_tbs); |
| } |
| |
| /* map the remaining (adjusted) nocopy/dup fragments */ |
| bool used_dup_io_buf = false; |
| for (int i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) { |
| const void* data = cmddata[i]; |
| |
| if (!cmdlen[i]) { |
| continue; |
| } |
| if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY | IWL_HCMD_DFL_DUP))) { |
| continue; |
| } |
| |
| // Assume only one fragment needs DUP and NOCOPY. Needs to extend the txq_entry.dup_io_buf to 2 |
| // if we need to support 2 NOCOPY fragments. |
| if (used_dup_io_buf) { |
| mtx_unlock(&txq->lock); |
| IWL_ERR(trans, "Cannot have 2 NOCOPY or DUP fragments in one command.\n"); |
| return ZX_ERR_IO_INVALID; |
| } else { |
| used_dup_io_buf = true; |
| } |
| |
| // Allocate an io_buffer to store the remaining data (either a DUP or a NOCOPY fragment). |
| // |
| // For the DUP case, as the flag described, the data is copied into the io_buffer for the |
| // caller to use it in Rx path. |
| // |
| // For the NOCOPY case, since it is larger than TFD_MAX_PAYLOAD_SIZE, we have to copy the data |
| // into the io_buffer and map it to physical address. However, the original purpose of this flag |
| // is to avoid copy due to performance consideration. So created TODO(42212) to track this. |
| // |
| struct iwl_iobuf* dup_io_buf = txq->entries[cmd_idx].dup_io_buf; |
| |
| // Allocate a cached io_buffer, copy the data, and flush the cache at once. The io_buffer will |
| // be released (reclaimed) in iwl_pcie_rx_handle_rb(). |
| // |
| // In theory, using cached io_buffer is faster. No matter how memcpy is implemented (copying |
| // byte-by-byte or word-by-word), writing to cache always has smaller cycles than writing to |
| // SDRAM. Even during the cache flush stage, the memory write is done in cache-line size, which |
| // is still faster than CPU write. |
| // |
| // However, it is arguable weather flush is needed or not since some x86 platforms/PCIe devices |
| // support cached read. But this is not guaranteed on all platforms (e.g. ARM). So let's play |
| // safe first. |
| // |
| ZX_ASSERT(!dup_io_buf); |
| uint16_t dup_len = cmdlen[i]; |
| iwl_iobuf_allocate_contiguous(&trans_pcie->pci_dev->dev, dup_len, &dup_io_buf); |
| void* virt_addr = iwl_iobuf_virtual(dup_io_buf); |
| memcpy(virt_addr, data, dup_len); |
| phys_addr = iwl_iobuf_physical(dup_io_buf); |
| iwl_pcie_txq_build_tfd(trans, txq, phys_addr, dup_len, false, &num_tbs); |
| iwl_iobuf_cache_flush(dup_io_buf, 0, dup_len); |
| txq->entries[cmd_idx].dup_io_buf = dup_io_buf; |
| } |
| |
| BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * BITS_PER_BYTE); |
| |
| out_meta->flags = cmd->flags; |
| |
| #if 0 // NEEDS_PORTING |
| trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide); |
| #endif // NEEDS_PORTING |
| |
| /* start timer if queue currently empty */ |
| if (txq->read_ptr == txq->write_ptr && txq->wd_timeout) { |
| iwl_irq_timer_start(txq->stuck_timer, txq->wd_timeout); |
| } |
| |
| mtx_lock(&trans_pcie->reg_lock); |
| status = iwl_pcie_set_cmd_in_flight(trans, cmd); |
| if (status != ZX_OK) { |
| mtx_unlock(&trans_pcie->reg_lock); |
| mtx_unlock(&txq->lock); |
| return status; |
| } |
| |
| /* Increment and update queue's write index */ |
| txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr); |
| iwl_pcie_txq_inc_wr_ptr(trans, txq); |
| mtx_unlock(&trans_pcie->reg_lock); |
| mtx_unlock(&txq->lock); |
| |
| if (cmd_idx_out) { |
| *cmd_idx_out = cmd_idx; |
| } |
| |
| return ZX_OK; |
| } |
| |
| /* |
| * iwl_pcie_hcmd_complete - Pull unused buffers off the queue and reclaim them |
| * @rxb: Rx buffer to reclaim |
| */ |
| void iwl_pcie_hcmd_complete(struct iwl_trans* trans, struct iwl_rx_cmd_buffer* rxb) { |
| struct iwl_rx_packet* pkt = rxb_addr(rxb); |
| uint16_t sequence = le16_to_cpu(pkt->hdr.sequence); |
| uint8_t group_id; |
| uint32_t cmd_id; |
| int txq_id = SEQ_TO_QUEUE(sequence); |
| int index = SEQ_TO_INDEX(sequence); |
| int cmd_index; |
| struct iwl_device_cmd* cmd; |
| struct iwl_cmd_meta* meta; |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[trans_pcie->cmd_queue]; |
| |
| /* If a Tx command is being handled and it isn't in the actual |
| * command queue then there a command routing bug has been introduced |
| * in the queue management code. */ |
| if (txq_id != trans_pcie->cmd_queue) { |
| IWL_WARN(trans, "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n", |
| txq_id, trans_pcie->cmd_queue, sequence, txq->read_ptr, txq->write_ptr); |
| #if 0 // NEEDS_PORTING |
| iwl_print_hex_error(trans, pkt, 32); |
| #endif // NEEDS_PORTING |
| return; |
| } |
| |
| mtx_lock(&txq->lock); |
| |
| cmd_index = iwl_pcie_get_cmd_index(txq, index); |
| cmd = (struct iwl_device_cmd*)iwl_iobuf_virtual(txq->entries[cmd_index].cmd); |
| meta = &txq->entries[cmd_index].meta; |
| group_id = cmd->hdr.group_id; |
| cmd_id = iwl_cmd_id(cmd->hdr.cmd, group_id, 0); |
| |
| iwl_pcie_tfd_unmap(trans, meta, txq, index); |
| |
| /* Input error checking is done when commands are added to queue. */ |
| if (meta->flags & CMD_WANT_SKB) { |
| #if 0 // NEEDS_PORTING |
| struct page* p = rxb_steal_page(rxb); |
| #endif // NEEDS_PORTING |
| |
| meta->source->resp_pkt = pkt; |
| } |
| |
| if (meta->flags & CMD_WANT_ASYNC_CALLBACK) { |
| iwl_op_mode_async_cb(trans->op_mode, cmd); |
| } |
| |
| iwl_pcie_cmdq_reclaim(trans, txq_id, index); |
| |
| if (!(meta->flags & CMD_ASYNC)) { |
| if (!test_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status)) { |
| IWL_WARN(trans, "HCMD_ACTIVE already clear for command %s\n", |
| iwl_get_cmd_string(trans, cmd_id)); |
| } |
| clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); |
| IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n", |
| iwl_get_cmd_string(trans, cmd_id)); |
| sync_completion_signal(&trans_pcie->wait_command_queue); |
| } |
| |
| if (meta->flags & CMD_MAKE_TRANS_IDLE) { |
| IWL_DEBUG_INFO(trans, "complete %s - mark trans as idle\n", |
| iwl_get_cmd_string(trans, cmd->hdr.cmd)); |
| set_bit(STATUS_TRANS_IDLE, &trans->status); |
| #if 0 // NEEDS_PORTING |
| wake_up(&trans_pcie->d0i3_waitq); |
| #endif // NEEDS_PORTING |
| } |
| |
| if (meta->flags & CMD_WAKE_UP_TRANS) { |
| IWL_DEBUG_INFO(trans, "complete %s - clear trans idle flag\n", |
| iwl_get_cmd_string(trans, cmd->hdr.cmd)); |
| clear_bit(STATUS_TRANS_IDLE, &trans->status); |
| #if 0 // NEEDS_PORTING |
| wake_up(&trans_pcie->d0i3_waitq); |
| #endif // NEEDS_PORTING |
| } |
| |
| meta->flags = 0; |
| |
| mtx_unlock(&txq->lock); |
| } |
| |
| // (2 * HZ * CPTCFG_IWL_TIMEOUT_FACTOR) where CPTCFG_IWL_TIMEOUT_FACTOR is 1 by default |
| #define HOST_COMPLETE_TIMEOUT ZX_SEC(2) |
| |
| static zx_status_t iwl_pcie_send_hcmd_async(struct iwl_trans* trans, struct iwl_host_cmd* cmd) { |
| /* An asynchronous command can not expect an SKB to be set. */ |
| if (WARN_ON(cmd->flags & CMD_WANT_SKB)) { |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| zx_status_t status = iwl_pcie_enqueue_hcmd(trans, cmd, /*cmd_idx=*/NULL); |
| if (status != ZX_OK) { |
| IWL_ERR(trans, "Error sending %s: enqueue_hcmd failed: %d\n", |
| iwl_get_cmd_string(trans, cmd->id), status); |
| return status; |
| } |
| return ZX_OK; |
| } |
| |
| static zx_status_t iwl_pcie_send_hcmd_sync(struct iwl_trans* trans, struct iwl_host_cmd* cmd) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[trans_pcie->cmd_queue]; |
| |
| IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n", iwl_get_cmd_string(trans, cmd->id)); |
| |
| if (test_and_set_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status)) { |
| IWL_WARN(trans, "Command %s: a command is already active!\n", |
| iwl_get_cmd_string(trans, cmd->id)); |
| return ZX_ERR_IO; |
| } |
| |
| IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n", iwl_get_cmd_string(trans, cmd->id)); |
| |
| #if 0 // NEEDS_PORTING |
| if (pm_runtime_suspended(&trans_pcie->pci_dev->dev)) { |
| ret = |
| wait_event_timeout(trans_pcie->d0i3_waitq, pm_runtime_active(&trans_pcie->pci_dev->dev), |
| msecs_to_jiffies(IWL_TRANS_IDLE_TIMEOUT)); |
| if (!ret) { |
| IWL_ERR(trans, "Timeout exiting D0i3 before hcmd\n"); |
| return -ETIMEDOUT; |
| } |
| } |
| #endif // NEEDS_PORTING |
| |
| sync_completion_reset(&trans_pcie->wait_command_queue); |
| |
| int cmd_idx; |
| zx_status_t status = iwl_pcie_enqueue_hcmd(trans, cmd, &cmd_idx); |
| if (status != ZX_OK) { |
| clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); |
| IWL_ERR(trans, "Error sending %s: enqueue_hcmd failed: %d\n", |
| iwl_get_cmd_string(trans, cmd->id), status); |
| return status; |
| } |
| |
| status = sync_completion_wait(&trans_pcie->wait_command_queue, HOST_COMPLETE_TIMEOUT); |
| if (status != ZX_OK) { |
| IWL_ERR(trans, "Error sending %s: time out after %ldms (%s).\n", |
| iwl_get_cmd_string(trans, cmd->id), |
| zx_nsec_from_duration(HOST_COMPLETE_TIMEOUT) / 1000000, zx_status_get_string(status)); |
| |
| IWL_ERR(trans, "Current CMD queue read_ptr %d write_ptr %d\n", txq->read_ptr, txq->write_ptr); |
| |
| clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status); |
| IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n", |
| iwl_get_cmd_string(trans, cmd->id)); |
| status = ZX_ERR_TIMED_OUT; |
| |
| iwl_force_nmi(trans); |
| iwl_trans_fw_error(trans); |
| |
| goto cancel; |
| } |
| |
| if (test_bit(STATUS_FW_ERROR, &trans->status)) { |
| iwl_trans_pcie_dump_regs(trans); |
| IWL_ERR(trans, "FW error in SYNC CMD %s\n", iwl_get_cmd_string(trans, cmd->id)); |
| status = ZX_ERR_IO; |
| goto cancel; |
| } |
| |
| if (!(cmd->flags & CMD_SEND_IN_RFKILL) && test_bit(STATUS_RFKILL_OPMODE, &trans->status)) { |
| IWL_DEBUG_RF_KILL(trans, "RFKILL in SYNC CMD... no rsp\n"); |
| status = ZX_ERR_BAD_STATE; |
| goto cancel; |
| } |
| |
| if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) { |
| IWL_ERR(trans, "Error: Response NULL in '%s'\n", iwl_get_cmd_string(trans, cmd->id)); |
| status = ZX_ERR_IO; |
| goto cancel; |
| } |
| |
| return ZX_OK; |
| |
| cancel: |
| if (cmd->flags & CMD_WANT_SKB) { |
| /* |
| * Cancel the CMD_WANT_SKB flag for the cmd in the |
| * TX cmd queue. Otherwise in case the cmd comes |
| * in later, it will possibly set an invalid |
| * address (cmd->meta.source). |
| */ |
| txq->entries[cmd_idx].meta.flags &= ~CMD_WANT_SKB; |
| } |
| |
| if (cmd->resp_pkt) { |
| iwl_free_resp(cmd); |
| cmd->resp_pkt = NULL; |
| } |
| |
| return status; |
| } |
| |
| int iwl_trans_pcie_send_hcmd(struct iwl_trans* trans, struct iwl_host_cmd* cmd) { |
| /* Make sure the NIC is still alive in the bus */ |
| if (test_bit(STATUS_TRANS_DEAD, &trans->status)) { |
| return ZX_ERR_BAD_STATE; |
| } |
| |
| if (!(cmd->flags & CMD_SEND_IN_RFKILL) && test_bit(STATUS_RFKILL_OPMODE, &trans->status)) { |
| IWL_DEBUG_RF_KILL(trans, "Dropping CMD 0x%x: RF KILL\n", cmd->id); |
| return ZX_ERR_BAD_STATE; |
| } |
| |
| IWL_DEBUG_TX(trans, "HCMD: iwl_trans_pcie_send_hcmd( %s ) len=%4d,%4d %s %s [%s %s, %s %s]\n", |
| iwl_get_cmd_string(trans, cmd->id), cmd->len[0], cmd->len[1], |
| cmd->flags & CMD_ASYNC ? "ASYNC" : " SYNC", |
| cmd->flags & CMD_WANT_SKB ? "SKB" : " ", |
| cmd->dataflags[0] & IWL_HCMD_DFL_NOCOPY ? "NOCOPY" : "", |
| cmd->dataflags[0] & IWL_HCMD_DFL_DUP ? "DUP" : "", |
| cmd->dataflags[1] & IWL_HCMD_DFL_NOCOPY ? "NOCOPY" : "", |
| cmd->dataflags[1] & IWL_HCMD_DFL_DUP ? "DUP" : ""); |
| |
| zx_status_t status; |
| if (cmd->flags & CMD_ASYNC) { |
| status = iwl_pcie_send_hcmd_async(trans, cmd); |
| } else { |
| /* We still can fail on RFKILL that can be asserted while we wait */ |
| status = iwl_pcie_send_hcmd_sync(trans, cmd); |
| } |
| |
| return status; |
| } |
| |
| #if 0 // NEEDS_PORTING |
| #ifdef CPTCFG_MAC80211_LATENCY_MEASUREMENTS |
| static void iwl_trans_pci_tx_lat_add_ts_write(struct sk_buff* skb) { |
| s64 temp = ktime_to_ms(ktime_get()); |
| s64 ts_1 = ktime_to_ns(skb->tstamp) >> 32; |
| s64 diff = temp - ts_1; |
| |
| #if LINUX_VERSION_IS_LESS(4, 10, 0) |
| skb->tstamp.tv64 += diff << 16; |
| #else |
| skb->tstamp += diff << 16; |
| #endif |
| } |
| #endif |
| #endif // NEEDS_PORTING |
| |
| // TODO(fxbug.dev/61556): TSO/LSO support. |
| static zx_status_t iwl_fill_data_tbs(struct iwl_trans* trans, struct ieee80211_mac_packet* pkt, |
| struct iwl_txq* txq, int cmd_idx, uint32_t* num_tbs, |
| struct iwl_cmd_meta* out_meta) { |
| /* |
| * Set up TFD's third entry to point directly to remainder |
| * of skb's head, if any |
| */ |
| uint16_t head_tb_len = pkt->headroom_used_size + pkt->body_size; |
| |
| if (head_tb_len > 0) { |
| // Allocate the dup_io_buf |
| struct iwl_iobuf* dup_io_buf = txq->entries[cmd_idx].dup_io_buf; |
| ZX_ASSERT(!dup_io_buf); |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| zx_status_t ret = |
| iwl_iobuf_allocate_contiguous(&trans_pcie->pci_dev->dev, head_tb_len, &dup_io_buf); |
| if (ret != ZX_OK) { |
| IWL_ERR(trans, "%s(): io_buffer_init() failed: %s\n", __func__, zx_status_get_string(ret)); |
| return ret; |
| } |
| |
| // copy packet in |
| char* const virt_addr = (char*)iwl_iobuf_virtual(dup_io_buf); |
| memcpy(virt_addr, pkt->headroom, pkt->headroom_used_size); |
| memcpy(virt_addr + pkt->headroom_used_size, pkt->body, pkt->body_size); |
| iwl_iobuf_cache_flush(dup_io_buf, 0, head_tb_len); |
| zx_paddr_t phys_addr = iwl_iobuf_physical(dup_io_buf); |
| iwl_pcie_txq_build_tfd(trans, txq, phys_addr, head_tb_len, false, num_tbs); |
| txq->entries[cmd_idx].dup_io_buf = dup_io_buf; |
| } |
| |
| return ZX_OK; |
| } |
| |
| #if 0 // NEEDS_PORTING |
| #ifdef CONFIG_INET |
| struct iwl_tso_hdr_page* get_page_hdr(struct iwl_trans* trans, size_t len) { |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_tso_hdr_page* p = this_cpu_ptr(trans_pcie->tso_hdr_page); |
| |
| if (!p->page) { goto alloc; } |
| |
| /* enough room on this page */ |
| if (p->pos + len < (uint8_t*)page_address(p->page) + PAGE_SIZE) { return p; } |
| |
| /* We don't have enough room on this page, get a new one. */ |
| __free_page(p->page); |
| |
| alloc: |
| p->page = alloc_page(GFP_ATOMIC); |
| if (!p->page) { return NULL; } |
| p->pos = page_address(p->page); |
| return p; |
| } |
| |
| static void iwl_compute_pseudo_hdr_csum(void* iph, struct tcphdr* tcph, bool ipv6, |
| unsigned int len) { |
| if (ipv6) { |
| struct ipv6hdr* iphv6 = iph; |
| |
| tcph->check = |
| ~csum_ipv6_magic(&iphv6->saddr, &iphv6->daddr, len + tcph->doff * 4, IPPROTO_TCP, 0); |
| } else { |
| struct iphdr* iphv4 = iph; |
| |
| ip_send_check(iphv4); |
| tcph->check = |
| ~csum_tcpudp_magic(iphv4->saddr, iphv4->daddr, len + tcph->doff * 4, IPPROTO_TCP, 0); |
| } |
| } |
| |
| static int iwl_fill_data_tbs_amsdu(struct iwl_trans* trans, struct sk_buff* skb, |
| struct iwl_txq* txq, uint8_t hdr_len, |
| struct iwl_cmd_meta* out_meta, struct iwl_device_cmd* dev_cmd, |
| uint16_t tb1_len) { |
| struct iwl_tx_cmd* tx_cmd = (void*)dev_cmd->payload; |
| struct iwl_trans_pcie* trans_pcie = txq->trans_pcie; |
| struct ieee80211_hdr* hdr = (void*)skb->data; |
| unsigned int snap_ip_tcp_hdrlen, ip_hdrlen, total_len, hdr_room; |
| unsigned int mss = skb_shinfo(skb)->gso_size; |
| uint16_t length, iv_len, amsdu_pad; |
| uint8_t* start_hdr; |
| struct iwl_tso_hdr_page* hdr_page; |
| struct page** page_ptr; |
| struct tso_t tso; |
| |
| /* if the packet is protected, then it must be CCMP or GCMP */ |
| BUILD_BUG_ON(IEEE80211_CCMP_HDR_LEN != IEEE80211_GCMP_HDR_LEN); |
| iv_len = ieee80211_has_protected(hdr->frame_control) ? IEEE80211_CCMP_HDR_LEN : 0; |
| |
| trace_iwlwifi_dev_tx(trans->dev, skb, iwl_pcie_get_tfd(trans, txq, txq->write_ptr), |
| trans_pcie->tfd_size, &dev_cmd->hdr, IWL_FIRST_TB_SIZE + tb1_len, 0); |
| |
| ip_hdrlen = skb_transport_header(skb) - skb_network_header(skb); |
| snap_ip_tcp_hdrlen = 8 + ip_hdrlen + tcp_hdrlen(skb); |
| total_len = skb->len - snap_ip_tcp_hdrlen - hdr_len - iv_len; |
| amsdu_pad = 0; |
| |
| /* total amount of header we may need for this A-MSDU */ |
| hdr_room = |
| DIV_ROUND_UP(total_len, mss) * (3 + snap_ip_tcp_hdrlen + sizeof(struct ethhdr)) + iv_len; |
| |
| /* Our device supports 9 segments at most, it will fit in 1 page */ |
| hdr_page = get_page_hdr(trans, hdr_room); |
| if (!hdr_page) { return -ENOMEM; } |
| |
| get_page(hdr_page->page); |
| start_hdr = hdr_page->pos; |
| page_ptr = (void*)((uint8_t*)skb->cb + trans_pcie->page_offs); |
| *page_ptr = hdr_page->page; |
| memcpy(hdr_page->pos, skb->data + hdr_len, iv_len); |
| hdr_page->pos += iv_len; |
| |
| /* |
| * Pull the ieee80211 header + IV to be able to use TSO core, |
| * we will restore it for the tx_status flow. |
| */ |
| skb_pull(skb, hdr_len + iv_len); |
| |
| /* |
| * Remove the length of all the headers that we don't actually |
| * have in the MPDU by themselves, but that we duplicate into |
| * all the different MSDUs inside the A-MSDU. |
| */ |
| le16_add_cpu(&tx_cmd->len, -snap_ip_tcp_hdrlen); |
| |
| tso_start(skb, &tso); |
| |
| while (total_len) { |
| /* this is the data left for this subframe */ |
| unsigned int data_left = min_t(unsigned int, mss, total_len); |
| struct sk_buff* csum_skb = NULL; |
| unsigned int hdr_tb_len; |
| dma_addr_t hdr_tb_phys; |
| struct tcphdr* tcph; |
| uint8_t *iph, *subf_hdrs_start = hdr_page->pos; |
| |
| total_len -= data_left; |
| |
| memset(hdr_page->pos, 0, amsdu_pad); |
| hdr_page->pos += amsdu_pad; |
| amsdu_pad = (4 - (sizeof(struct ethhdr) + snap_ip_tcp_hdrlen + data_left)) & 0x3; |
| ether_addr_copy(hdr_page->pos, ieee80211_get_DA(hdr)); |
| hdr_page->pos += ETH_ALEN; |
| ether_addr_copy(hdr_page->pos, ieee80211_get_SA(hdr)); |
| hdr_page->pos += ETH_ALEN; |
| |
| length = snap_ip_tcp_hdrlen + data_left; |
| *((__be16*)hdr_page->pos) = cpu_to_be16(length); |
| hdr_page->pos += sizeof(length); |
| |
| /* |
| * This will copy the SNAP as well which will be considered |
| * as MAC header. |
| */ |
| tso_build_hdr(skb, hdr_page->pos, &tso, data_left, !total_len); |
| iph = hdr_page->pos + 8; |
| tcph = (void*)(iph + ip_hdrlen); |
| |
| /* For testing on current hardware only */ |
| if (trans_pcie->sw_csum_tx) { |
| csum_skb = alloc_skb(data_left + tcp_hdrlen(skb), GFP_ATOMIC); |
| if (!csum_skb) { return -ENOMEM; } |
| |
| iwl_compute_pseudo_hdr_csum(iph, tcph, skb->protocol == htons(ETH_P_IPV6), data_left); |
| |
| skb_put_data(csum_skb, tcph, tcp_hdrlen(skb)); |
| skb_reset_transport_header(csum_skb); |
| csum_skb->csum_start = (unsigned char*)tcp_hdr(csum_skb) - csum_skb->head; |
| } |
| |
| hdr_page->pos += snap_ip_tcp_hdrlen; |
| |
| hdr_tb_len = hdr_page->pos - start_hdr; |
| hdr_tb_phys = dma_map_single(trans->dev, start_hdr, hdr_tb_len, DMA_TO_DEVICE); |
| if (unlikely(dma_mapping_error(trans->dev, hdr_tb_phys))) { |
| dev_kfree_skb(csum_skb); |
| return -EINVAL; |
| } |
| iwl_pcie_txq_build_tfd(trans, txq, hdr_tb_phys, hdr_tb_len, false); |
| trace_iwlwifi_dev_tx_tb(trans->dev, skb, start_hdr, hdr_tb_len); |
| /* add this subframe's headers' length to the tx_cmd */ |
| le16_add_cpu(&tx_cmd->len, hdr_page->pos - subf_hdrs_start); |
| |
| /* prepare the start_hdr for the next subframe */ |
| start_hdr = hdr_page->pos; |
| |
| /* put the payload */ |
| while (data_left) { |
| unsigned int size = min_t(unsigned int, tso.size, data_left); |
| dma_addr_t tb_phys; |
| |
| if (trans_pcie->sw_csum_tx) { skb_put_data(csum_skb, tso.data, size); } |
| |
| tb_phys = dma_map_single(trans->dev, tso.data, size, DMA_TO_DEVICE); |
| if (unlikely(dma_mapping_error(trans->dev, tb_phys))) { |
| dev_kfree_skb(csum_skb); |
| return -EINVAL; |
| } |
| |
| iwl_pcie_txq_build_tfd(trans, txq, tb_phys, size, false); |
| trace_iwlwifi_dev_tx_tb(trans->dev, skb, tso.data, size); |
| |
| data_left -= size; |
| tso_build_data(skb, &tso, size); |
| } |
| |
| /* For testing on early hardware only */ |
| if (trans_pcie->sw_csum_tx) { |
| __wsum csum; |
| |
| csum = skb_checksum(csum_skb, skb_checksum_start_offset(csum_skb), |
| csum_skb->len - skb_checksum_start_offset(csum_skb), 0); |
| dev_kfree_skb(csum_skb); |
| dma_sync_single_for_cpu(trans->dev, hdr_tb_phys, hdr_tb_len, DMA_TO_DEVICE); |
| tcph->check = csum_fold(csum); |
| dma_sync_single_for_device(trans->dev, hdr_tb_phys, hdr_tb_len, DMA_TO_DEVICE); |
| } |
| } |
| |
| /* re -add the WiFi header and IV */ |
| skb_push(skb, hdr_len + iv_len); |
| |
| return 0; |
| } |
| #else /* CONFIG_INET */ |
| static int iwl_fill_data_tbs_amsdu(struct iwl_trans* trans, struct sk_buff* skb, |
| struct iwl_txq* txq, uint8_t hdr_len, |
| struct iwl_cmd_meta* out_meta, struct iwl_device_cmd* dev_cmd, |
| uint16_t tb1_len) { |
| /* No A-MSDU without CONFIG_INET */ |
| WARN_ON(1); |
| |
| return -1; |
| } |
| #endif /* CONFIG_INET */ |
| #endif // NEEDS_PORTING |
| |
| // Transmit a packet from MLME. |
| // |
| // This function will create 3 TFDs: |
| // |
| // <----------------- *dev_cmd -------------> <--------------- *pkt from MLME -----------------> |
| // <- 4B -> <------ struct iwl_tx_cmd ------> <-- 802.11 hdr --> <--- 802.11 payload ---> |
| // +------------+ +--------------------------------------------------+ +----------------------+ |
| // | tb0 | | tb1 | | tb2 | |
| // | | | ('cmd_io_buf') | | ('dup_io_buf') | |
| // +------------+ +--------------------------------------------------+ +----------------------+ |
| // <- 20 bytes -> <---------------- max 304 bytes -------------------> <---- any length ----> |
| // |
| // The 1st and 2nd descriptors are for 'struct iwl_device_cmd' structure. We copy it from the caller |
| // into the 'cmd' io_buffer of the txq entry. |
| // |
| // Note that the payload of 'struct iwl_device_cmd' is actually the 'struct iwl_tx_cmd'. Moreover, |
| // at end of 'struct iwl_tx_cmd', the MAC header of 'pkt' is also copied in iwl_mvm_set_tx_params(). |
| // |
| // The 3rd descriptor is for the 802.11 payload. We re-used the 'dup_io_buf' in the structure to |
| // store the payload. Currently we only support one fragment (the pkt->packet_head) and always |
| // copy the payload because the firmware will transmit the packet in asynchronous manner. |
| // |
| zx_status_t iwl_trans_pcie_tx(struct iwl_trans* trans, struct ieee80211_mac_packet* pkt, |
| const struct iwl_device_cmd* dev_cmd, int txq_id) { |
| zx_status_t ret = ZX_OK; |
| ZX_DEBUG_ASSERT(trans); |
| ZX_DEBUG_ASSERT(pkt); |
| ZX_DEBUG_ASSERT(dev_cmd); |
| |
| struct iwl_trans_pcie* trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); |
| struct iwl_txq* txq = trans_pcie->txq[txq_id]; |
| int cmd_idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr); |
| |
| if (!test_bit(txq_id, trans_pcie->queue_used)) { |
| IWL_ERR(trans, "TX on unused queue %d\n", txq_id); |
| return ZX_ERR_INVALID_ARGS; |
| } |
| |
| mtx_lock(&txq->lock); |
| |
| int available_space = iwl_queue_space(trans, txq); |
| if (available_space < txq->high_mark) { |
| iwl_stop_queue(trans, txq); |
| IWL_WARN(trans, "stopped queue because the avaliable space (%d) is too small (< %d)\n", |
| available_space, txq->high_mark); |
| |
| /* don't put the packet on the ring, if there is no room */ |
| if (unlikely(available_space < TX_RESERVED_SPACE)) { |
| mtx_unlock(&txq->lock); |
| IWL_WARN(trans, "dropped packet due to small available space: %d\n", available_space); |
| return ZX_OK; |
| } |
| } |
| |
| // First copy 'dev_cmd' to 'out_cmd'. This is easier to copy the whole cmd to tb0 and tb1 |
| // respectively. |
| ZX_ASSERT(!txq->entries[cmd_idx].cmd); |
| zx_status_t status = iwl_iobuf_allocate_contiguous(&trans_pcie->pci_dev->dev, TB1_MAX_SIZE, |
| &txq->entries[cmd_idx].cmd); |
| if (status != ZX_OK) { |
| IWL_ERR(trans, "pcie TX io_buffer_init() failed: %s\n", zx_status_get_string(status)); |
| ret = status; |
| goto unlock; |
| } |
| struct iwl_device_cmd* out_cmd = iwl_iobuf_virtual(txq->entries[cmd_idx].cmd); |
| *out_cmd = *dev_cmd; // Copy into the TXQ memory shared with the firmware. |
| |
| #if 0 // NEEDS_PORTING |
| /* In AGG mode, the index in the ring must correspond to the WiFi |
| * sequence number. This is a HW requirements to help the SCD to parse |
| * the BA. |
| * Check here that the packets are in the right place on the ring. |
| */ |
| wifi_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl)); |
| WARN_ONCE(txq->ampdu && (wifi_seq & 0xff) != txq->write_ptr, "Q: %d WiFi Seq %d tfdNum %d", |
| txq_id, wifi_seq, txq->write_ptr); |
| #endif // NEEDS_PORTING |
| |
| out_cmd->hdr.sequence = |
| cpu_to_le16((uint16_t)(QUEUE_TO_SEQ(txq_id) | INDEX_TO_SEQ(txq->write_ptr))); |
| |
| struct iwl_cmd_meta* out_meta = &txq->entries[cmd_idx].meta; |
| out_meta->flags = 0; |
| |
| ///////////////////////////////////////////////////////////////////////////////////////////////// |
| // (tb0) start the TFD with the minimum copy bytes. |
| // |
| struct iwl_pcie_first_tb_buf* tb_bufs = iwl_iobuf_virtual(txq->first_tb_bufs); |
| const uint16_t tb0_size = IWL_FIRST_TB_SIZE; |
| memcpy(&tb_bufs[cmd_idx], &out_cmd->hdr, tb0_size); |
| uint32_t num_tbs; |
| |
| zx_paddr_t tb0_phys = iwl_pcie_get_first_tb_dma(txq, txq->write_ptr); |
| zx_paddr_t scratch_phys = |
| tb0_phys + sizeof(struct iwl_cmd_header) + offsetof(struct iwl_tx_cmd, scratch); |
| |
| struct iwl_tx_cmd* tx_cmd = (struct iwl_tx_cmd*)out_cmd->payload; |
| tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys); |
| tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys); |
| |
| iwl_pcie_txq_build_tfd(trans, txq, tb0_phys, tb0_size, true, &num_tbs); |
| |
| /* there must be data left over for TB1 or this code must be changed */ |
| BUILD_BUG_ON(sizeof(struct iwl_tx_cmd) < IWL_FIRST_TB_SIZE); |
| |
| ///////////////////////////////////////////////////////////////////////////////////////////////// |
| // (tb1) the rest of 'iwl_device_cmd' and 802.11 header. |
| // |
| |
| const uint16_t tb1_len = |
| sizeof(struct iwl_cmd_header) + sizeof(struct iwl_tx_cmd) - tb0_size + pkt->header_size; |
| // See original code: "do not align A-MSDU to dword as the subframe header aligns it" |
| // TODO(51295): we don't align the length when we enable A-MSDU in the future. |
| const uint16_t aligned_len = ROUND_UP(tb1_len, 4); |
| if (tb1_len != aligned_len) { |
| IWL_DEBUG_TX(trans, "Adjusted the tb1_len=%d ==> aligned_len=%d\n", tb1_len, aligned_len); |
| tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_MH_PAD); |
| } |
| |
| zx_paddr_t phys_addr = iwl_iobuf_physical(txq->entries[cmd_idx].cmd); |
| zx_paddr_t tb1_phys = phys_addr + tb0_size; |
| iwl_pcie_txq_build_tfd(trans, txq, tb1_phys, tb1_len, false, &num_tbs); |
| |
| #if 1 |
| ///////////////////////////////////////////////////////////////////////////////////////////////// |
| // (tb2) the 802.11 payload |
| // |
| if ((ret = iwl_fill_data_tbs(trans, pkt, txq, cmd_idx, &num_tbs, out_meta)) != ZX_OK) { |
| goto unlock; |
| } |
| #else // NEEDS_PORTING |
| // TODO(51295): handle the GSO case in the future. |
| /* |
| * If gso_size wasn't set, don't give the frame "amsdu treatment" |
| * (adding subframes, etc.). |
| * This can happen in some testing flows when the amsdu was already |
| * pre-built, and we just need to send the resulting skb. |
| */ |
| if (amsdu && skb_shinfo(skb)->gso_size) { |
| if (unlikely(iwl_fill_data_tbs_amsdu(trans, skb, txq, hdr_len, out_meta, dev_cmd, tb1_len))) { |
| goto out_err; |
| } |
| } else { |
| struct sk_buff* frag; |
| |
| if (unlikely(iwl_fill_data_tbs(trans, skb, txq, hdr_len, out_meta))) { |
| goto out_err; |
| } |
| |
| skb_walk_frags(skb, frag) { |
| if (unlikely(iwl_fill_data_tbs(trans, frag, txq, 0, out_meta))) { |
| goto out_err; |
| } |
| } |
| } |
| |
| /* building the A-MSDU might have changed this data, so memcpy it now */ |
| memcpy(&txq->first_tb_bufs[txq->write_ptr], dev_cmd, IWL_FIRST_TB_SIZE); |
| #endif // NEEDS_PORTING |
| |
| void* tfd = iwl_pcie_get_tfd(trans, txq, txq->write_ptr); |
| /* Set up entry for this TFD in Tx byte-count array */ |
| iwl_pcie_txq_update_byte_cnt_tbl(trans, txq, le16_to_cpu(tx_cmd->len), |
| iwl_pcie_tfd_get_num_tbs(trans, tfd)); |
| |
| #if 1 // NEEDS_PORTING |
| /* start timer if queue currently empty */ |
| if (txq->read_ptr == txq->write_ptr) { |
| iwl_trans_ref(trans); |
| } |
| #else // NEEDS_PORTING |
| /* start timer if queue currently empty */ |
| if (txq->read_ptr == txq->write_ptr) { |
| if (txq->wd_timeout) { |
| /* |
| * If the TXQ is active, then set the timer, if not, |
| * set the timer in remainder so that the timer will |
| * be armed with the right value when the station will |
| * wake up. |
| */ |
| if (!txq->frozen) { |
| mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout); |
| } else { |
| txq->frozen_expiry_remainder = txq->wd_timeout; |
| } |
| } |
| IWL_DEBUG_RPM(trans, "Q: %d first tx - take ref\n", txq->id); |
| iwl_trans_ref(trans); |
| } |
| #endif // NEEDS_PORTING |
| |
| /* Tell device the write index *just past* this latest filled TFD */ |
| txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr); |
| |
| #if 1 // NEEDS_PORTING |
| iwl_pcie_txq_inc_wr_ptr(trans, txq); |
| /* |
| * At this point the frame is "transmitted" successfully |
| * and we will get a TX status notification eventually. |
| */ |
| #else // NEEDS_PORTING |
| bool wait_write_ptr = ieee80211_has_morefrags(fc); |
| if (!wait_write_ptr) { |
| iwl_pcie_txq_inc_wr_ptr(trans, txq); |
| } |
| #endif // NEEDS_PORTING |
| |
| unlock: |
| mtx_unlock(&txq->lock); |
| |
| return ret; |
| } |