diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c | 1141 |
1 files changed, 1141 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c new file mode 100644 index 000000000000..4a0c95302a7e --- /dev/null +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c @@ -0,0 +1,1141 @@ +/****************************************************************************** + * + * Copyright(c) 2003 - 2011 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 <ilw@linux.intel.com> + * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 + * + *****************************************************************************/ +#include <linux/etherdevice.h> +#include <linux/slab.h> +#include <linux/sched.h> + +#include "iwl-debug.h" +#include "iwl-csr.h" +#include "iwl-prph.h" +#include "iwl-io.h" +#include "iwl-agn-hw.h" +#include "iwl-trans-pcie-int.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 = + (struct iwl_tx_cmd *) txq->cmd[txq->q.write_ptr]->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 (hw_params(trans).shadow_reg_enable) { + /* shadow register enabled */ + iwl_write32(bus(trans), HBUS_TARG_WRPTR, + txq->q.write_ptr | (txq_id << 8)); + } else { + /* if we're trying to save power */ + if (test_bit(STATUS_POWER_PMI, &trans->shrd->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(bus(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(bus(trans), CSR_GP_CNTRL, + CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); + return; + } + + iwl_write_direct32(bus(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(bus(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 iwlagn_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(bus(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(bus(trans)->dev, iwl_tfd_tb_get_addr(tfd, i), + iwl_tfd_tb_get_len(tfd, i), dma_dir); +} + +/** + * iwlagn_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr] + * @trans - transport private data + * @txq - tx queue + * @index - the index of the TFD to be freed + *@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 iwlagn_txq_free_tfd(struct iwl_trans *trans, struct iwl_tx_queue *txq, + int index, enum dma_data_direction dma_dir) +{ + struct iwl_tfd *tfd_tmp = txq->tfds; + + iwlagn_unmap_tfd(trans, &txq->meta[index], &tfd_tmp[index], dma_dir); + + /* free SKB */ + if (txq->skbs) { + struct sk_buff *skb; + + skb = txq->skbs[index]; + + /* 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_free_skb(priv(trans), skb); + txq->skbs[index] = 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 = + (struct iwl_tx_cmd *) txq->cmd[txq->q.read_ptr]->payload; + + WARN_ON(read_ptr >= TFD_QUEUE_SIZE_MAX); + + if (txq_id != trans->shrd->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 iwlagn_tx_queue_set_q2ratid(struct iwl_trans *trans, u16 ra_tid, + u16 txq_id) +{ + u32 tbl_dw_addr; + u32 tbl_dw; + u16 scd_q2ratid; + + struct iwl_trans_pcie *trans_pcie = + IWL_TRANS_GET_PCIE_TRANS(trans); + + 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(bus(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(bus(trans), tbl_dw_addr, tbl_dw); + + return 0; +} + +static void iwlagn_tx_queue_stop_scheduler(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(bus(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_set_wr_ptrs(struct iwl_trans *trans, + int txq_id, u32 index) +{ + iwl_write_direct32(bus(trans), HBUS_TARG_WRPTR, + (index & 0xff) | (txq_id << 8)); + iwl_write_prph(bus(trans), SCD_QUEUE_RDPTR(txq_id), index); +} + +void iwl_trans_tx_queue_set_status(struct iwl_trans *trans, + struct iwl_tx_queue *txq, + int tx_fifo_id, int scd_retry) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + int txq_id = txq->q.id; + int active = + test_bit(txq_id, &trans_pcie->txq_ctx_active_msk) ? 1 : 0; + + iwl_write_prph(bus(trans), SCD_QUEUE_STATUS_BITS(txq_id), + (active << SCD_QUEUE_STTS_REG_POS_ACTIVE) | + (tx_fifo_id << SCD_QUEUE_STTS_REG_POS_TXF) | + (1 << SCD_QUEUE_STTS_REG_POS_WSL) | + SCD_QUEUE_STTS_REG_MSK); + + txq->sched_retry = scd_retry; + + IWL_DEBUG_INFO(trans, "%s %s Queue %d on FIFO %d\n", + active ? "Activate" : "Deactivate", + scd_retry ? "BA" : "AC/CMD", txq_id, tx_fifo_id); +} + +static inline int get_fifo_from_tid(struct iwl_trans_pcie *trans_pcie, + u8 ctx, u16 tid) +{ + const u8 *ac_to_fifo = trans_pcie->ac_to_fifo[ctx]; + if (likely(tid < ARRAY_SIZE(tid_to_ac))) + return ac_to_fifo[tid_to_ac[tid]]; + + /* no support for TIDs 8-15 yet */ + return -EINVAL; +} + +void iwl_trans_pcie_tx_agg_setup(struct iwl_trans *trans, + enum iwl_rxon_context_id ctx, int sta_id, + int tid, int frame_limit) +{ + int tx_fifo, txq_id, ssn_idx; + u16 ra_tid; + unsigned long flags; + struct iwl_tid_data *tid_data; + + struct iwl_trans_pcie *trans_pcie = + IWL_TRANS_GET_PCIE_TRANS(trans); + + if (WARN_ON(sta_id == IWL_INVALID_STATION)) + return; + if (WARN_ON(tid >= IWL_MAX_TID_COUNT)) + return; + + tx_fifo = get_fifo_from_tid(trans_pcie, ctx, tid); + if (WARN_ON(tx_fifo < 0)) { + IWL_ERR(trans, "txq_agg_setup, bad fifo: %d\n", tx_fifo); + return; + } + + spin_lock_irqsave(&trans->shrd->sta_lock, flags); + tid_data = &trans->shrd->tid_data[sta_id][tid]; + ssn_idx = SEQ_TO_SN(tid_data->seq_number); + txq_id = tid_data->agg.txq_id; + spin_unlock_irqrestore(&trans->shrd->sta_lock, flags); + + ra_tid = BUILD_RAxTID(sta_id, tid); + + spin_lock_irqsave(&trans->shrd->lock, flags); + + /* Stop this Tx queue before configuring it */ + iwlagn_tx_queue_stop_scheduler(trans, txq_id); + + /* Map receiver-address / traffic-ID to this queue */ + iwlagn_tx_queue_set_q2ratid(trans, ra_tid, txq_id); + + /* Set this queue as a chain-building queue */ + iwl_set_bits_prph(bus(trans), SCD_QUEUECHAIN_SEL, (1<<txq_id)); + + /* enable aggregations for the queue */ + iwl_set_bits_prph(bus(trans), SCD_AGGR_SEL, (1<<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_idx & 0xff); + trans_pcie->txq[txq_id].q.write_ptr = (ssn_idx & 0xff); + iwl_trans_set_wr_ptrs(trans, txq_id, ssn_idx); + + /* Set up Tx window size and frame limit for this queue */ + iwl_write_targ_mem(bus(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)); + + iwl_set_bits_prph(bus(trans), SCD_INTERRUPT_MASK, (1 << txq_id)); + + /* Set up Status area in SRAM, map to Tx DMA/FIFO, activate the queue */ + iwl_trans_tx_queue_set_status(trans, &trans_pcie->txq[txq_id], + tx_fifo, 1); + + trans_pcie->txq[txq_id].sta_id = sta_id; + trans_pcie->txq[txq_id].tid = tid; + + spin_unlock_irqrestore(&trans->shrd->lock, flags); +} + +/* + * Find first available (lowest unused) Tx Queue, mark it "active". + * Called only when finding queue for aggregation. + * Should never return anything < 7, because they should already + * be in use as EDCA AC (0-3), Command (4), reserved (5, 6) + */ +static int iwlagn_txq_ctx_activate_free(struct iwl_trans *trans) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + int txq_id; + + for (txq_id = 0; txq_id < hw_params(trans).max_txq_num; txq_id++) + if (!test_and_set_bit(txq_id, + &trans_pcie->txq_ctx_active_msk)) + return txq_id; + return -1; +} + +int iwl_trans_pcie_tx_agg_alloc(struct iwl_trans *trans, + enum iwl_rxon_context_id ctx, int sta_id, + int tid, u16 *ssn) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + struct iwl_tid_data *tid_data; + unsigned long flags; + int txq_id; + + txq_id = iwlagn_txq_ctx_activate_free(trans); + if (txq_id == -1) { + IWL_ERR(trans, "No free aggregation queue available\n"); + return -ENXIO; + } + + spin_lock_irqsave(&trans->shrd->sta_lock, flags); + tid_data = &trans->shrd->tid_data[sta_id][tid]; + *ssn = SEQ_TO_SN(tid_data->seq_number); + tid_data->agg.txq_id = txq_id; + iwl_set_swq_id(&trans_pcie->txq[txq_id], get_ac_from_tid(tid), txq_id); + + tid_data = &trans->shrd->tid_data[sta_id][tid]; + if (tid_data->tfds_in_queue == 0) { + IWL_DEBUG_HT(trans, "HW queue is empty\n"); + tid_data->agg.state = IWL_AGG_ON; + iwl_start_tx_ba_trans_ready(priv(trans), ctx, sta_id, tid); + } else { + IWL_DEBUG_HT(trans, "HW queue is NOT empty: %d packets in HW" + "queue\n", tid_data->tfds_in_queue); + tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA; + } + spin_unlock_irqrestore(&trans->shrd->sta_lock, flags); + + return 0; +} + +void iwl_trans_pcie_txq_agg_disable(struct iwl_trans *trans, int txq_id) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + iwlagn_tx_queue_stop_scheduler(trans, txq_id); + + iwl_clear_bits_prph(bus(trans), SCD_AGGR_SEL, (1 << txq_id)); + + trans_pcie->txq[txq_id].q.read_ptr = 0; + trans_pcie->txq[txq_id].q.write_ptr = 0; + /* supposes that ssn_idx is valid (!= 0xFFF) */ + iwl_trans_set_wr_ptrs(trans, txq_id, 0); + + iwl_clear_bits_prph(bus(trans), SCD_INTERRUPT_MASK, (1 << txq_id)); + iwl_txq_ctx_deactivate(trans_pcie, txq_id); + iwl_trans_tx_queue_set_status(trans, &trans_pcie->txq[txq_id], 0, 0); +} + +int iwl_trans_pcie_tx_agg_disable(struct iwl_trans *trans, + enum iwl_rxon_context_id ctx, int sta_id, + int tid) +{ + struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans); + unsigned long flags; + int read_ptr, write_ptr; + struct iwl_tid_data *tid_data; + int txq_id; + + spin_lock_irqsave(&trans->shrd->sta_lock, flags); + + tid_data = &trans->shrd->tid_data[sta_id][tid]; + txq_id = tid_data->agg.txq_id; + + if ((IWLAGN_FIRST_AMPDU_QUEUE > txq_id) || + (IWLAGN_FIRST_AMPDU_QUEUE + + hw_params(trans).num_ampdu_queues <= txq_id)) { + IWL_ERR(trans, + "queue number out of range: %d, must be %d to %d\n", + txq_id, IWLAGN_FIRST_AMPDU_QUEUE, + IWLAGN_FIRST_AMPDU_QUEUE + + hw_params(trans).num_ampdu_queues - 1); + spin_unlock_irqrestore(&trans->shrd->sta_lock, flags); + return -EINVAL; + } + + switch (trans->shrd->tid_data[sta_id][tid].agg.state) { + case IWL_EMPTYING_HW_QUEUE_ADDBA: + /* + * This can happen if the peer stops aggregation + * again before we've had a chance to drain the + * queue we selected previously, i.e. before the + * session was really started completely. + */ + IWL_DEBUG_HT(trans, "AGG stop before setup done\n"); + goto turn_off; + case IWL_AGG_ON: + break; + default: + IWL_WARN(trans, "Stopping AGG while state not ON " + "or starting for %d on %d (%d)\n", sta_id, tid, + trans->shrd->tid_data[sta_id][tid].agg.state); + spin_unlock_irqrestore(&trans->shrd->sta_lock, flags); + return 0; + } + + write_ptr = trans_pcie->txq[txq_id].q.write_ptr; + read_ptr = trans_pcie->txq[txq_id].q.read_ptr; + + /* The queue is not empty */ + if (write_ptr != read_ptr) { + IWL_DEBUG_HT(trans, "Stopping a non empty AGG HW QUEUE\n"); + trans->shrd->tid_data[sta_id][tid].agg.state = + IWL_EMPTYING_HW_QUEUE_DELBA; + spin_unlock_irqrestore(&trans->shrd->sta_lock, flags); + return 0; + } + + IWL_DEBUG_HT(trans, "HW queue is empty\n"); +turn_off: + trans->shrd->tid_data[sta_id][tid].agg.state = IWL_AGG_OFF; + + /* do not restore/save irqs */ + spin_unlock(&trans->shrd->sta_lock); + spin_lock(&trans->shrd->lock); + + iwl_trans_pcie_txq_agg_disable(trans, txq_id); + + spin_unlock_irqrestore(&trans->shrd->lock, flags); + + iwl_stop_tx_ba_trans_ready(priv(trans), ctx, sta_id, tid); + + return 0; +} + +/*************** 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->shrd->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; + unsigned long flags; + u32 idx; + u16 copy_size, cmd_size; + bool is_ct_kill = false; + bool had_nocopy = false; + int i; + u8 *cmd_dest; +#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 + + if (test_bit(STATUS_FW_ERROR, &trans->shrd->status)) { + IWL_WARN(trans, "fw recovery, no hcmd send\n"); + return -EIO; + } + + if ((trans->shrd->ucode_owner == IWL_OWNERSHIP_TM) && + !(cmd->flags & CMD_ON_DEMAND)) { + IWL_DEBUG_HC(trans, "tm own the uCode, no regular hcmd send\n"); + return -EIO; + } + + 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; + + if (iwl_is_rfkill(trans->shrd) || iwl_is_ctkill(trans->shrd)) { + IWL_WARN(trans, "Not sending command - %s KILL\n", + iwl_is_rfkill(trans->shrd) ? "RF" : "CT"); + return -EIO; + } + + spin_lock_irqsave(&trans->hcmd_lock, flags); + + if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) { + spin_unlock_irqrestore(&trans->hcmd_lock, flags); + + IWL_ERR(trans, "No space in command queue\n"); + is_ct_kill = iwl_check_for_ct_kill(priv(trans)); + if (!is_ct_kill) { + IWL_ERR(trans, "Restarting adapter queue is full\n"); + iwlagn_fw_error(priv(trans), false); + } + return -ENOSPC; + } + + idx = get_cmd_index(q, q->write_ptr); + out_cmd = txq->cmd[idx]; + out_meta = &txq->meta[idx]; + + 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->shrd->cmd_queue) | + INDEX_TO_SEQ(q->write_ptr)); + + /* and copy the data that needs to be copied */ + + cmd_dest = out_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(cmd_dest, cmd->data[i], cmd->len[i]); + cmd_dest += cmd->len[i]; + } + + IWL_DEBUG_HC(trans, "Sending command %s (#%x), seq: 0x%04X, " + "%d bytes at %d[%d]:%d\n", + get_cmd_string(out_cmd->hdr.cmd), + out_cmd->hdr.cmd, + le16_to_cpu(out_cmd->hdr.sequence), cmd_size, + q->write_ptr, idx, trans->shrd->cmd_queue); + + phys_addr = dma_map_single(bus(trans)->dev, &out_cmd->hdr, copy_size, + DMA_BIDIRECTIONAL); + if (unlikely(dma_mapping_error(bus(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(bus(trans)->dev, + (void *)cmd->data[i], + cmd->len[i], DMA_BIDIRECTIONAL); + if (dma_mapping_error(bus(trans)->dev, phys_addr)) { + iwlagn_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(priv(trans), cmd->flags, + trace_bufs[0], trace_lens[0], + trace_bufs[1], trace_lens[1], + trace_bufs[2], trace_lens[2]); +#endif + + /* 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_irqrestore(&trans->hcmd_lock, flags); + return idx; +} + +/** + * 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; + + 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); + iwlagn_fw_error(priv(trans), false); + } + + } +} + +/** + * 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_mem_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->shrd->cmd_queue]; + unsigned long flags; + + /* 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->shrd->cmd_queue, + "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n", + txq_id, trans->shrd->cmd_queue, sequence, + trans_pcie->txq[trans->shrd->cmd_queue].q.read_ptr, + trans_pcie->txq[trans->shrd->cmd_queue].q.write_ptr)) { + iwl_print_hex_error(trans, pkt, 32); + return; + } + + cmd_index = get_cmd_index(&txq->q, index); + cmd = txq->cmd[cmd_index]; + meta = &txq->meta[cmd_index]; + + txq->time_stamp = jiffies; + + iwlagn_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) { + meta->source->reply_page = (unsigned long)rxb_addr(rxb); + meta->source->handler_status = handler_status; + rxb->page = NULL; + } + + spin_lock_irqsave(&trans->hcmd_lock, flags); + + iwl_hcmd_queue_reclaim(trans, txq_id, index); + + if (!(meta->flags & CMD_ASYNC)) { + if (!test_bit(STATUS_HCMD_ACTIVE, &trans->shrd->status)) { + IWL_WARN(trans, + "HCMD_ACTIVE already clear for command %s\n", + get_cmd_string(cmd->hdr.cmd)); + } + clear_bit(STATUS_HCMD_ACTIVE, &trans->shrd->status); + IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n", + get_cmd_string(cmd->hdr.cmd)); + wake_up(&trans->shrd->wait_command_queue); + } + + meta->flags = 0; + + spin_unlock_irqrestore(&trans->hcmd_lock, flags); +} + +#define HOST_COMPLETE_TIMEOUT (2 * HZ) + +static int iwl_send_cmd_async(struct iwl_trans *trans, struct iwl_host_cmd *cmd) +{ + int ret; + + /* An asynchronous command can not expect an SKB to be set. */ + if (WARN_ON(cmd->flags & CMD_WANT_SKB)) + return -EINVAL; + + + if (test_bit(STATUS_EXIT_PENDING, &trans->shrd->status)) + return -EBUSY; + + ret = iwl_enqueue_hcmd(trans, cmd); + if (ret < 0) { + IWL_ERR(trans, "Error sending %s: enqueue_hcmd failed: %d\n", + get_cmd_string(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; + + lockdep_assert_held(&trans->shrd->mutex); + + IWL_DEBUG_INFO(trans, "Attempting to send sync command %s\n", + get_cmd_string(cmd->id)); + + set_bit(STATUS_HCMD_ACTIVE, &trans->shrd->status); + IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n", + get_cmd_string(cmd->id)); + + cmd_idx = iwl_enqueue_hcmd(trans, cmd); + if (cmd_idx < 0) { + ret = cmd_idx; + clear_bit(STATUS_HCMD_ACTIVE, &trans->shrd->status); + IWL_ERR(trans, "Error sending %s: enqueue_hcmd failed: %d\n", + get_cmd_string(cmd->id), ret); + return ret; + } + + ret = wait_event_timeout(trans->shrd->wait_command_queue, + !test_bit(STATUS_HCMD_ACTIVE, &trans->shrd->status), + HOST_COMPLETE_TIMEOUT); + if (!ret) { + if (test_bit(STATUS_HCMD_ACTIVE, &trans->shrd->status)) { + struct iwl_tx_queue *txq = + &trans_pcie->txq[trans->shrd->cmd_queue]; + struct iwl_queue *q = &txq->q; + + IWL_ERR(trans, + "Error sending %s: time out after %dms.\n", + get_cmd_string(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->shrd->status); + IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command" + "%s\n", get_cmd_string(cmd->id)); + ret = -ETIMEDOUT; + goto cancel; + } + } + + if (test_bit(STATUS_RF_KILL_HW, &trans->shrd->status)) { + IWL_ERR(trans, "Command %s aborted: RF KILL Switch\n", + get_cmd_string(cmd->id)); + ret = -ECANCELED; + goto fail; + } + if (test_bit(STATUS_FW_ERROR, &trans->shrd->status)) { + IWL_ERR(trans, "Command %s failed: FW Error\n", + get_cmd_string(cmd->id)); + ret = -EIO; + goto fail; + } + if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) { + IWL_ERR(trans, "Error: Response NULL in '%s'\n", + get_cmd_string(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->shrd->cmd_queue].meta[cmd_idx].flags &= + ~CMD_WANT_SKB; + } +fail: + if (cmd->reply_page) { + iwl_free_pages(trans->shrd, cmd->reply_page); + cmd->reply_page = 0; + } + + 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->shrd->cmd_queue)) + return 0; + + /*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; + } + + IWL_DEBUG_TX_REPLY(trans, "reclaim: [%d, %d, %d]\n", txq_id, + q->read_ptr, index); + + 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->skbs[txq->q.read_ptr] == NULL)) + continue; + + __skb_queue_tail(skbs, txq->skbs[txq->q.read_ptr]); + + txq->skbs[txq->q.read_ptr] = NULL; + + iwlagn_txq_inval_byte_cnt_tbl(trans, txq); + + iwlagn_txq_free_tfd(trans, txq, txq->q.read_ptr, DMA_TO_DEVICE); + freed++; + } + return freed; +} |