/****************************************************************************** * * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved. * * Portions of this file are derived from the ipw3945 project, as well * as portions of the ieee80211 subsystem header files. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA * * The full GNU General Public License is included in this distribution in the * file called LICENSE. * * Contact Information: * Intel Linux Wireless * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 * *****************************************************************************/ #include #include #include #include "iwl-debug.h" #include "iwl-csr.h" #include "iwl-prph.h" #include "iwl-io.h" #include "iwl-op-mode.h" #include "internal.h" /* FIXME: need to abstract out TX command (once we know what it looks like) */ #include "dvm/commands.h" #define IWL_TX_CRC_SIZE 4 #define IWL_TX_DELIMITER_SIZE 4 /** * iwl_trans_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array */ void iwl_trans_txq_update_byte_cnt_tbl(struct iwl_trans *trans, struct iwl_tx_queue *txq, u16 byte_cnt) { struct iwlagn_scd_bc_tbl *scd_bc_tbl; struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); int write_ptr = txq->q.write_ptr; int txq_id = txq->q.id; u8 sec_ctl = 0; u8 sta_id = 0; u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE; __le16 bc_ent; struct iwl_tx_cmd *tx_cmd = (void *) txq->entries[txq->q.write_ptr].cmd->payload; scd_bc_tbl = trans_pcie->scd_bc_tbls.addr; WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX); sta_id = tx_cmd->sta_id; sec_ctl = tx_cmd->sec_ctl; switch (sec_ctl & TX_CMD_SEC_MSK) { case TX_CMD_SEC_CCM: len += CCMP_MIC_LEN; break; case TX_CMD_SEC_TKIP: len += TKIP_ICV_LEN; break; case TX_CMD_SEC_WEP: len += WEP_IV_LEN + WEP_ICV_LEN; break; } bc_ent = cpu_to_le16((len & 0xFFF) | (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; } /** * iwl_txq_update_write_ptr - Send new write index to hardware */ void iwl_txq_update_write_ptr(struct iwl_trans *trans, struct iwl_tx_queue *txq) { u32 reg = 0; int txq_id = txq->q.id; if (txq->need_update == 0) return; if (trans->cfg->base_params->shadow_reg_enable) { /* shadow register enabled */ iwl_write32(trans, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8)); } else { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); /* if we're trying to save power */ if (test_bit(STATUS_TPOWER_PMI, &trans_pcie->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, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); return; } iwl_write_direct32(trans, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8)); /* * else not in power-save mode, * uCode will never sleep when we're * trying to tx (during RFKILL, we're not trying to tx). */ } else iwl_write32(trans, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8)); } txq->need_update = 0; } static inline dma_addr_t iwl_tfd_tb_get_addr(struct iwl_tfd *tfd, u8 idx) { struct iwl_tfd_tb *tb = &tfd->tbs[idx]; dma_addr_t addr = get_unaligned_le32(&tb->lo); if (sizeof(dma_addr_t) > sizeof(u32)) addr |= ((dma_addr_t)(le16_to_cpu(tb->hi_n_len) & 0xF) << 16) << 16; return addr; } static inline u16 iwl_tfd_tb_get_len(struct iwl_tfd *tfd, u8 idx) { struct iwl_tfd_tb *tb = &tfd->tbs[idx]; return le16_to_cpu(tb->hi_n_len) >> 4; } static inline void iwl_tfd_set_tb(struct iwl_tfd *tfd, u8 idx, dma_addr_t addr, u16 len) { struct iwl_tfd_tb *tb = &tfd->tbs[idx]; u16 hi_n_len = len << 4; put_unaligned_le32(addr, &tb->lo); if (sizeof(dma_addr_t) > sizeof(u32)) hi_n_len |= ((addr >> 16) >> 16) & 0xF; tb->hi_n_len = cpu_to_le16(hi_n_len); tfd->num_tbs = idx + 1; } static inline u8 iwl_tfd_get_num_tbs(struct iwl_tfd *tfd) { return tfd->num_tbs & 0x1f; } static void iwl_unmap_tfd(struct iwl_trans *trans, struct iwl_cmd_meta *meta, struct iwl_tfd *tfd, enum dma_data_direction dma_dir) { int i; int num_tbs; /* Sanity check on number of chunks */ num_tbs = iwl_tfd_get_num_tbs(tfd); if (num_tbs >= IWL_NUM_OF_TBS) { IWL_ERR(trans, "Too many chunks: %i\n", num_tbs); /* @todo issue fatal error, it is quite serious situation */ return; } /* Unmap tx_cmd */ if (num_tbs) dma_unmap_single(trans->dev, dma_unmap_addr(meta, mapping), dma_unmap_len(meta, len), DMA_BIDIRECTIONAL); /* Unmap chunks, if any. */ for (i = 1; i < num_tbs; i++) dma_unmap_single(trans->dev, iwl_tfd_tb_get_addr(tfd, i), iwl_tfd_tb_get_len(tfd, i), dma_dir); tfd->num_tbs = 0; } /** * iwl_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr] * @trans - transport private data * @txq - tx queue * @dma_dir - the direction of the DMA mapping * * Does NOT advance any TFD circular buffer read/write indexes * Does NOT free the TFD itself (which is within circular buffer) */ void iwl_txq_free_tfd(struct iwl_trans *trans, struct iwl_tx_queue *txq, enum dma_data_direction dma_dir) { struct iwl_tfd *tfd_tmp = txq->tfds; /* rd_ptr is bounded by n_bd and idx is bounded by n_window */ int rd_ptr = txq->q.read_ptr; int idx = get_cmd_index(&txq->q, rd_ptr); lockdep_assert_held(&txq->lock); /* We have only q->n_window txq->entries, but we use q->n_bd tfds */ iwl_unmap_tfd(trans, &txq->entries[idx].meta, &tfd_tmp[rd_ptr], dma_dir); /* free SKB */ if (txq->entries) { struct sk_buff *skb; skb = txq->entries[idx].skb; /* Can be called from irqs-disabled context * If skb is not NULL, it means that the whole queue is being * freed and that the queue is not empty - free the skb */ if (skb) { iwl_op_mode_free_skb(trans->op_mode, skb); txq->entries[idx].skb = NULL; } } } int iwlagn_txq_attach_buf_to_tfd(struct iwl_trans *trans, struct iwl_tx_queue *txq, dma_addr_t addr, u16 len, u8 reset) { struct iwl_queue *q; struct iwl_tfd *tfd, *tfd_tmp; u32 num_tbs; q = &txq->q; tfd_tmp = txq->tfds; tfd = &tfd_tmp[q->write_ptr]; if (reset) memset(tfd, 0, sizeof(*tfd)); num_tbs = iwl_tfd_get_num_tbs(tfd); /* Each TFD can point to a maximum 20 Tx buffers */ if (num_tbs >= IWL_NUM_OF_TBS) { IWL_ERR(trans, "Error can not send more than %d chunks\n", IWL_NUM_OF_TBS); return -EINVAL; } if (WARN_ON(addr & ~DMA_BIT_MASK(36))) return -EINVAL; if (unlikely(addr & ~IWL_TX_DMA_MASK)) IWL_ERR(trans, "Unaligned address = %llx\n", (unsigned long long)addr); iwl_tfd_set_tb(tfd, num_tbs, addr, len); return 0; } /*************** 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(const struct iwl_queue *q) { int s = q->read_ptr - q->write_ptr; if (q->read_ptr > q->write_ptr) s -= q->n_bd; if (s <= 0) s += q->n_window; /* keep some reserve to not confuse empty and full situations */ s -= 2; if (s < 0) s = 0; return s; } /** * iwl_queue_init - Initialize queue's high/low-water and read/write indexes */ int iwl_queue_init(struct iwl_queue *q, int count, int slots_num, u32 id) { q->n_bd = count; q->n_window = slots_num; q->id = id; /* count must be power-of-two size, otherwise iwl_queue_inc_wrap * and iwl_queue_dec_wrap are broken. */ if (WARN_ON(!is_power_of_2(count))) return -EINVAL; /* slots_num must be power-of-two size, otherwise * get_cmd_index is broken. */ if (WARN_ON(!is_power_of_2(slots_num))) return -EINVAL; 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 = q->read_ptr = 0; return 0; } static void iwlagn_txq_inval_byte_cnt_tbl(struct iwl_trans *trans, struct iwl_tx_queue *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->q.id; int read_ptr = txq->q.read_ptr; u8 sta_id = 0; __le16 bc_ent; struct iwl_tx_cmd *tx_cmd = (void *)txq->entries[txq->q.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; } static int iwl_txq_set_ratid_map(struct iwl_trans *trans, u16 ra_tid, u16 txq_id) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); u32 tbl_dw_addr; u32 tbl_dw; u16 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_read_targ_mem(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_write_targ_mem(trans, tbl_dw_addr, tbl_dw); return 0; } static inline void iwl_txq_set_inactive(struct iwl_trans *trans, u16 txq_id) { /* Simply stop the queue, but don't change any configuration; * the SCD_ACT_EN bit is the write-enable mask for the ACTIVE bit. */ iwl_write_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id), (0 << SCD_QUEUE_STTS_REG_POS_ACTIVE)| (1 << SCD_QUEUE_STTS_REG_POS_SCD_ACT_EN)); } void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, int fifo, int sta_id, int tid, int frame_limit, u16 ssn) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); if (test_and_set_bit(txq_id, trans_pcie->queue_used)) WARN_ONCE(1, "queue %d already used - expect issues", txq_id); /* Stop this Tx queue before configuring it */ iwl_txq_set_inactive(trans, txq_id); /* Set this queue as a chain-building queue unless it is CMD queue */ if (txq_id != trans_pcie->cmd_queue) iwl_set_bits_prph(trans, SCD_QUEUECHAIN_SEL, BIT(txq_id)); /* If this queue is mapped to a certain station: it is an AGG queue */ if (sta_id != IWL_INVALID_STATION) { u16 ra_tid = BUILD_RAxTID(sta_id, tid); /* Map receiver-address / traffic-ID to this queue */ iwl_txq_set_ratid_map(trans, ra_tid, txq_id); /* enable aggregations for the queue */ iwl_set_bits_prph(trans, SCD_AGGR_SEL, BIT(txq_id)); } 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_clear_bits_prph(trans, SCD_AGGR_SEL, BIT(txq_id)); } /* Place first TFD at index corresponding to start sequence number. * Assumes that ssn_idx is valid (!= 0xFFF) */ trans_pcie->txq[txq_id].q.read_ptr = (ssn & 0xff); trans_pcie->txq[txq_id].q.write_ptr = (ssn & 0xff); iwl_write_direct32(trans, HBUS_TARG_WRPTR, (ssn & 0xff) | (txq_id << 8)); iwl_write_prph(trans, SCD_QUEUE_RDPTR(txq_id), ssn); /* Set up Tx window size and frame limit for this queue */ iwl_write_targ_mem(trans, trans_pcie->scd_base_addr + SCD_CONTEXT_QUEUE_OFFSET(txq_id), 0); iwl_write_targ_mem(trans, trans_pcie->scd_base_addr + SCD_CONTEXT_QUEUE_OFFSET(txq_id) + sizeof(u32), ((frame_limit << SCD_QUEUE_CTX_REG2_WIN_SIZE_POS) & SCD_QUEUE_CTX_REG2_WIN_SIZE_MSK) | ((frame_limit << SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) & SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK)); /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */ iwl_write_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id), (1 << SCD_QUEUE_STTS_REG_POS_ACTIVE) | (fifo << SCD_QUEUE_STTS_REG_POS_TXF) | (1 << SCD_QUEUE_STTS_REG_POS_WSL) | SCD_QUEUE_STTS_REG_MSK); IWL_DEBUG_TX_QUEUES(trans, "Activate queue %d on FIFO %d WrPtr: %d\n", txq_id, fifo, ssn & 0xff); } void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int txq_id) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); u16 rd_ptr, wr_ptr; int n_bd = trans_pcie->txq[txq_id].q.n_bd; if (!test_and_clear_bit(txq_id, trans_pcie->queue_used)) { WARN_ONCE(1, "queue %d not used", txq_id); return; } rd_ptr = iwl_read_prph(trans, SCD_QUEUE_RDPTR(txq_id)) & (n_bd - 1); wr_ptr = iwl_read_prph(trans, SCD_QUEUE_WRPTR(txq_id)); WARN_ONCE(rd_ptr != wr_ptr, "queue %d isn't empty: [%d,%d]", txq_id, rd_ptr, wr_ptr); iwl_txq_set_inactive(trans, txq_id); IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", txq_id); } /*************** HOST COMMAND QUEUE FUNCTIONS *****/ /** * iwl_enqueue_hcmd - enqueue a uCode command * @priv: device private data point * @cmd: a point to the ucode command structure * * The function returns < 0 values to indicate the operation is * failed. On success, it turns the index (> 0) of command in the * command queue. */ static int iwl_enqueue_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); struct iwl_tx_queue *txq = &trans_pcie->txq[trans_pcie->cmd_queue]; struct iwl_queue *q = &txq->q; struct iwl_device_cmd *out_cmd; struct iwl_cmd_meta *out_meta; dma_addr_t phys_addr; u32 idx; u16 copy_size, cmd_size; bool had_nocopy = false; int i; u32 cmd_pos; #ifdef CONFIG_IWLWIFI_DEVICE_TRACING const void *trace_bufs[IWL_MAX_CMD_TFDS + 1] = {}; int trace_lens[IWL_MAX_CMD_TFDS + 1] = {}; int trace_idx; #endif copy_size = sizeof(out_cmd->hdr); cmd_size = sizeof(out_cmd->hdr); /* need one for the header if the first is NOCOPY */ BUILD_BUG_ON(IWL_MAX_CMD_TFDS > IWL_NUM_OF_TBS - 1); for (i = 0; i < IWL_MAX_CMD_TFDS; i++) { if (!cmd->len[i]) continue; if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) { had_nocopy = true; } else { /* NOCOPY must not be followed by normal! */ if (WARN_ON(had_nocopy)) return -EINVAL; copy_size += cmd->len[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 (WARN_ON(copy_size > TFD_MAX_PAYLOAD_SIZE)) return -EINVAL; spin_lock_bh(&txq->lock); if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) { spin_unlock_bh(&txq->lock); IWL_ERR(trans, "No space in command queue\n"); iwl_op_mode_cmd_queue_full(trans->op_mode); return -ENOSPC; } idx = get_cmd_index(q, q->write_ptr); out_cmd = txq->entries[idx].cmd; out_meta = &txq->entries[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 */ out_cmd->hdr.cmd = cmd->id; out_cmd->hdr.flags = 0; out_cmd->hdr.sequence = cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) | INDEX_TO_SEQ(q->write_ptr)); /* and copy the data that needs to be copied */ cmd_pos = offsetof(struct iwl_device_cmd, payload); for (i = 0; i < IWL_MAX_CMD_TFDS; i++) { if (!cmd->len[i]) continue; if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) break; memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], cmd->len[i]); cmd_pos += cmd->len[i]; } WARN_ON_ONCE(txq->entries[idx].copy_cmd); /* * since out_cmd will be the source address of the FH, it will write * the retry count there. So when the user needs to receivce the HCMD * that corresponds to the response in the response handler, it needs * to set CMD_WANT_HCMD. */ if (cmd->flags & CMD_WANT_HCMD) { txq->entries[idx].copy_cmd = kmemdup(out_cmd, cmd_pos, GFP_ATOMIC); if (unlikely(!txq->entries[idx].copy_cmd)) { idx = -ENOMEM; goto out; } } IWL_DEBUG_HC(trans, "Sending command %s (#%x), seq: 0x%04X, %d bytes at %d[%d]:%d\n", trans_pcie_get_cmd_string(trans_pcie, out_cmd->hdr.cmd), out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence), cmd_size, q->write_ptr, idx, trans_pcie->cmd_queue); phys_addr = dma_map_single(trans->dev, &out_cmd->hdr, copy_size, DMA_BIDIRECTIONAL); if (unlikely(dma_mapping_error(trans->dev, phys_addr))) { idx = -ENOMEM; goto out; } dma_unmap_addr_set(out_meta, mapping, phys_addr); dma_unmap_len_set(out_meta, len, copy_size); iwlagn_txq_attach_buf_to_tfd(trans, txq, phys_addr, copy_size, 1); #ifdef CONFIG_IWLWIFI_DEVICE_TRACING trace_bufs[0] = &out_cmd->hdr; trace_lens[0] = copy_size; trace_idx = 1; #endif for (i = 0; i < IWL_MAX_CMD_TFDS; i++) { if (!cmd->len[i]) continue; if (!(cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY)) continue; phys_addr = dma_map_single(trans->dev, (void *)cmd->data[i], cmd->len[i], DMA_BIDIRECTIONAL); if (dma_mapping_error(trans->dev, phys_addr)) { iwl_unmap_tfd(trans, out_meta, &txq->tfds[q->write_ptr], DMA_BIDIRECTIONAL); idx = -ENOMEM; goto out; } iwlagn_txq_attach_buf_to_tfd(trans, txq, phys_addr, cmd->len[i], 0); #ifdef CONFIG_IWLWIFI_DEVICE_TRACING trace_bufs[trace_idx] = cmd->data[i]; trace_lens[trace_idx] = cmd->len[i]; trace_idx++; #endif } out_meta->flags = cmd->flags; txq->need_update = 1; /* check that tracing gets all possible blocks */ BUILD_BUG_ON(IWL_MAX_CMD_TFDS + 1 != 3); #ifdef CONFIG_IWLWIFI_DEVICE_TRACING trace_iwlwifi_dev_hcmd(trans->dev, cmd->flags, trace_bufs[0], trace_lens[0], trace_bufs[1], trace_lens[1], trace_bufs[2], trace_lens[2]); #endif /* start timer if queue currently empty */ if (q->read_ptr == q->write_ptr && trans_pcie->wd_timeout) mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout); /* Increment and update queue's write index */ q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd); iwl_txq_update_write_ptr(trans, txq); out: spin_unlock_bh(&txq->lock); return idx; } static inline void iwl_queue_progress(struct iwl_trans_pcie *trans_pcie, struct iwl_tx_queue *txq) { if (!trans_pcie->wd_timeout) return; /* * if empty delete timer, otherwise move timer forward * since we're making progress on this queue */ if (txq->q.read_ptr == txq->q.write_ptr) del_timer(&txq->stuck_timer); else mod_timer(&txq->stuck_timer, jiffies + trans_pcie->wd_timeout); } /** * iwl_hcmd_queue_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. */ static void iwl_hcmd_queue_reclaim(struct iwl_trans *trans, int txq_id, int idx) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); struct iwl_tx_queue *txq = &trans_pcie->txq[txq_id]; struct iwl_queue *q = &txq->q; int nfreed = 0; lockdep_assert_held(&txq->lock); if ((idx >= q->n_bd) || (iwl_queue_used(q, idx) == 0)) { IWL_ERR(trans, "%s: Read index for DMA queue txq id (%d), index %d is out of range [0-%d] %d %d.\n", __func__, txq_id, idx, q->n_bd, q->write_ptr, q->read_ptr); return; } for (idx = iwl_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx; q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) { if (nfreed++ > 0) { IWL_ERR(trans, "HCMD skipped: index (%d) %d %d\n", idx, q->write_ptr, q->read_ptr); iwl_op_mode_nic_error(trans->op_mode); } } iwl_queue_progress(trans_pcie, txq); } /** * iwl_tx_cmd_complete - Pull unused buffers off the queue and reclaim them * @rxb: Rx buffer to reclaim * @handler_status: return value of the handler of the command * (put in setup_rx_handlers) * * If an Rx buffer has an async callback associated with it the callback * will be executed. The attached skb (if present) will only be freed * if the callback returns 1 */ void iwl_tx_cmd_complete(struct iwl_trans *trans, struct iwl_rx_cmd_buffer *rxb, int handler_status) { struct iwl_rx_packet *pkt = rxb_addr(rxb); u16 sequence = le16_to_cpu(pkt->hdr.sequence); 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_tx_queue *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 (WARN(txq_id != trans_pcie->cmd_queue, "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n", txq_id, trans_pcie->cmd_queue, sequence, trans_pcie->txq[trans_pcie->cmd_queue].q.read_ptr, trans_pcie->txq[trans_pcie->cmd_queue].q.write_ptr)) { iwl_print_hex_error(trans, pkt, 32); return; } spin_lock(&txq->lock); cmd_index = get_cmd_index(&txq->q, index); cmd = txq->entries[cmd_index].cmd; meta = &txq->entries[cmd_index].meta; iwl_unmap_tfd(trans, meta, &txq->tfds[index], DMA_BIDIRECTIONAL); /* Input error checking is done when commands are added to queue. */ if (meta->flags & CMD_WANT_SKB) { struct page *p = rxb_steal_page(rxb); meta->source->resp_pkt = pkt; meta->source->_rx_page_addr = (unsigned long)page_address(p); meta->source->_rx_page_order = trans_pcie->rx_page_order; meta->source->handler_status = handler_status; } iwl_hcmd_queue_reclaim(trans, txq_id, index); if (!(meta->flags & CMD_ASYNC)) { if (!test_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status)) { IWL_WARN(trans, "HCMD_ACTIVE already clear for command %s\n", trans_pcie_get_cmd_string(trans_pcie, cmd->hdr.cmd)); } clear_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status); IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n", trans_pcie_get_cmd_string(trans_pcie, cmd->hdr.cmd)); wake_up(&trans->wait_command_queue); } meta->flags = 0; spin_unlock(&txq->lock); } #define HOST_COMPLETE_TIMEOUT (2 * HZ) static int iwl_send_cmd_async(struct iwl_trans *trans, struct iwl_host_cmd *cmd) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); int ret; /* An asynchronous command can not expect an SKB to be set. */ if (WARN_ON(cmd->flags & CMD_WANT_SKB)) return -EINVAL; ret = iwl_enqueue_hcmd(trans, cmd); if (ret < 0) { IWL_ERR(trans, "Error sending %s: enqueue_hcmd failed: %d\n", trans_pcie_get_cmd_string(trans_pcie, cmd->id), ret); return ret; } return 0; } static int iwl_send_cmd_sync(struct iwl_trans *trans, struct iwl_host_cmd *cmd) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); int cmd_idx; int ret; IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n", trans_pcie_get_cmd_string(trans_pcie, cmd->id)); if (WARN_ON(test_and_set_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status))) { IWL_ERR(trans, "Command %s: a command is already active!\n", trans_pcie_get_cmd_string(trans_pcie, cmd->id)); return -EIO; } IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n", trans_pcie_get_cmd_string(trans_pcie, cmd->id)); cmd_idx = iwl_enqueue_hcmd(trans, cmd); if (cmd_idx < 0) { ret = cmd_idx; clear_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status); IWL_ERR(trans, "Error sending %s: enqueue_hcmd failed: %d\n", trans_pcie_get_cmd_string(trans_pcie, cmd->id), ret); return ret; } ret = wait_event_timeout(trans->wait_command_queue, !test_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status), HOST_COMPLETE_TIMEOUT); if (!ret) { if (test_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status)) { struct iwl_tx_queue *txq = &trans_pcie->txq[trans_pcie->cmd_queue]; struct iwl_queue *q = &txq->q; IWL_ERR(trans, "Error sending %s: time out after %dms.\n", trans_pcie_get_cmd_string(trans_pcie, cmd->id), jiffies_to_msecs(HOST_COMPLETE_TIMEOUT)); IWL_ERR(trans, "Current CMD queue read_ptr %d write_ptr %d\n", q->read_ptr, q->write_ptr); clear_bit(STATUS_HCMD_ACTIVE, &trans_pcie->status); IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n", trans_pcie_get_cmd_string(trans_pcie, cmd->id)); ret = -ETIMEDOUT; goto cancel; } } if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) { IWL_ERR(trans, "Error: Response NULL in '%s'\n", trans_pcie_get_cmd_string(trans_pcie, cmd->id)); ret = -EIO; goto cancel; } return 0; 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). */ trans_pcie->txq[trans_pcie->cmd_queue]. entries[cmd_idx].meta.flags &= ~CMD_WANT_SKB; } if (cmd->resp_pkt) { iwl_free_resp(cmd); cmd->resp_pkt = NULL; } return ret; } int iwl_trans_pcie_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) { if (cmd->flags & CMD_ASYNC) return iwl_send_cmd_async(trans, cmd); return iwl_send_cmd_sync(trans, cmd); } /* Frees buffers until index _not_ inclusive */ int iwl_tx_queue_reclaim(struct iwl_trans *trans, int txq_id, int index, struct sk_buff_head *skbs) { struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); struct iwl_tx_queue *txq = &trans_pcie->txq[txq_id]; struct iwl_queue *q = &txq->q; int last_to_free; int freed = 0; /* This function is not meant to release cmd queue*/ if (WARN_ON(txq_id == trans_pcie->cmd_queue)) return 0; lockdep_assert_held(&txq->lock); /*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(index, q->n_bd); if ((index >= q->n_bd) || (iwl_queue_used(q, last_to_free) == 0)) { IWL_ERR(trans, "%s: Read index for DMA queue txq id (%d), last_to_free %d is out of range [0-%d] %d %d.\n", __func__, txq_id, last_to_free, q->n_bd, q->write_ptr, q->read_ptr); return 0; } if (WARN_ON(!skb_queue_empty(skbs))) return 0; for (; q->read_ptr != index; q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd)) { if (WARN_ON_ONCE(txq->entries[txq->q.read_ptr].skb == NULL)) continue; __skb_queue_tail(skbs, txq->entries[txq->q.read_ptr].skb); txq->entries[txq->q.read_ptr].skb = NULL; iwlagn_txq_inval_byte_cnt_tbl(trans, txq); iwl_txq_free_tfd(trans, txq, DMA_TO_DEVICE); freed++; } iwl_queue_progress(trans_pcie, txq); return freed; }