From: Johannes Berg Date: Mon, 5 Mar 2012 19:24:24 +0000 (-0800) Subject: iwlwifi: introduce per-queue locks X-Git-Tag: v3.4-rc1~177^2~108^2~140 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=015c15e1067c988fc87fb550b222f075c8d3f47c;p=platform%2Fkernel%2Flinux-3.10.git iwlwifi: introduce per-queue locks Instead of (ab)using the sta_lock, make the transport layer lock its own TX queue data structures with a lock per queue. This also unifies with the cmd queue lock. Signed-off-by: Johannes Berg Signed-off-by: Wey-Yi Guy Signed-off-by: John W. Linville --- diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h index 5b26b71..b102946 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h @@ -169,6 +169,7 @@ struct iwl_queue { * @meta: array of meta data for each command/tx buffer * @dma_addr_cmd: physical address of cmd/tx buffer array * @txb: array of per-TFD driver data + * lock: queue lock * @time_stamp: time (in jiffies) of last read_ptr change * @need_update: indicates need to update read/write index * @sched_retry: indicates queue is high-throughput aggregation (HT AGG) enabled @@ -187,6 +188,7 @@ struct iwl_tx_queue { struct iwl_device_cmd **cmd; struct iwl_cmd_meta *meta; struct sk_buff **skbs; + spinlock_t lock; unsigned long time_stamp; u8 need_update; u8 sched_retry; diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c index 82e3448..1cb1dd2 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c @@ -217,6 +217,8 @@ void iwlagn_txq_free_tfd(struct iwl_trans *trans, struct iwl_tx_queue *txq, { struct iwl_tfd *tfd_tmp = txq->tfds; + lockdep_assert_held(&txq->lock); + iwlagn_unmap_tfd(trans, &txq->meta[index], &tfd_tmp[index], dma_dir); /* free SKB */ @@ -621,7 +623,6 @@ static int iwl_enqueue_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) 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; @@ -680,10 +681,10 @@ static int iwl_enqueue_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) return -EIO; } - spin_lock_irqsave(&trans->hcmd_lock, flags); + spin_lock_bh(&txq->lock); if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) { - spin_unlock_irqrestore(&trans->hcmd_lock, flags); + spin_unlock_bh(&txq->lock); IWL_ERR(trans, "No space in command queue\n"); is_ct_kill = iwl_check_for_ct_kill(priv(trans)); @@ -790,7 +791,7 @@ static int iwl_enqueue_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd) iwl_txq_update_write_ptr(trans, txq); out: - spin_unlock_irqrestore(&trans->hcmd_lock, flags); + spin_unlock_bh(&txq->lock); return idx; } @@ -809,6 +810,8 @@ static void iwl_hcmd_queue_reclaim(struct iwl_trans *trans, int 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__, @@ -850,7 +853,6 @@ void iwl_tx_cmd_complete(struct iwl_trans *trans, struct iwl_rx_mem_buffer *rxb, 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 @@ -864,6 +866,8 @@ void iwl_tx_cmd_complete(struct iwl_trans *trans, struct iwl_rx_mem_buffer *rxb, return; } + spin_lock(&txq->lock); + cmd_index = get_cmd_index(&txq->q, index); cmd = txq->cmd[cmd_index]; meta = &txq->meta[cmd_index]; @@ -880,8 +884,6 @@ void iwl_tx_cmd_complete(struct iwl_trans *trans, struct iwl_rx_mem_buffer *rxb, rxb->page = NULL; } - spin_lock_irqsave(&trans->hcmd_lock, flags); - iwl_hcmd_queue_reclaim(trans, txq_id, index); if (!(meta->flags & CMD_ASYNC)) { @@ -898,7 +900,7 @@ void iwl_tx_cmd_complete(struct iwl_trans *trans, struct iwl_rx_mem_buffer *rxb, meta->flags = 0; - spin_unlock_irqrestore(&trans->hcmd_lock, flags); + spin_unlock(&txq->lock); } #define HOST_COMPLETE_TIMEOUT (2 * HZ) @@ -1041,6 +1043,8 @@ int iwl_tx_queue_reclaim(struct iwl_trans *trans, int txq_id, int index, if (WARN_ON(txq_id == trans->shrd->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); diff --git a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c index 9f8b239..f47426a 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c +++ b/drivers/net/wireless/iwlwifi/iwl-trans-pcie.c @@ -390,6 +390,8 @@ static int iwl_trans_txq_init(struct iwl_trans *trans, struct iwl_tx_queue *txq, if (ret) return ret; + spin_lock_init(&txq->lock); + /* * Tell nic where to find circular buffer of Tx Frame Descriptors for * given Tx queue, and enable the DMA channel used for that queue. @@ -409,8 +411,6 @@ static void iwl_tx_queue_unmap(struct iwl_trans *trans, int txq_id) struct iwl_tx_queue *txq = &trans_pcie->txq[txq_id]; struct iwl_queue *q = &txq->q; enum dma_data_direction dma_dir; - unsigned long flags; - spinlock_t *lock; if (!q->n_bd) return; @@ -418,22 +418,19 @@ static void iwl_tx_queue_unmap(struct iwl_trans *trans, int txq_id) /* In the command queue, all the TBs are mapped as BIDI * so unmap them as such. */ - if (txq_id == trans->shrd->cmd_queue) { + if (txq_id == trans->shrd->cmd_queue) dma_dir = DMA_BIDIRECTIONAL; - lock = &trans->hcmd_lock; - } else { + else dma_dir = DMA_TO_DEVICE; - lock = &trans->shrd->sta_lock; - } - spin_lock_irqsave(lock, flags); + spin_lock_bh(&txq->lock); while (q->write_ptr != q->read_ptr) { /* The read_ptr needs to bound by q->n_window */ iwlagn_txq_free_tfd(trans, txq, get_cmd_index(q, q->read_ptr), dma_dir); q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd); } - spin_unlock_irqrestore(lock, flags); + spin_unlock_bh(&txq->lock); } /** @@ -1358,6 +1355,8 @@ static int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb, txq = &trans_pcie->txq[txq_id]; q = &txq->q; + spin_lock(&txq->lock); + /* 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. @@ -1404,7 +1403,7 @@ static int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb, &dev_cmd->hdr, firstlen, DMA_BIDIRECTIONAL); if (unlikely(dma_mapping_error(trans->dev, txcmd_phys))) - return -1; + goto out_err; dma_unmap_addr_set(out_meta, mapping, txcmd_phys); dma_unmap_len_set(out_meta, len, firstlen); @@ -1426,7 +1425,7 @@ static int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb, dma_unmap_addr(out_meta, mapping), dma_unmap_len(out_meta, len), DMA_BIDIRECTIONAL); - return -1; + goto out_err; } } @@ -1481,7 +1480,11 @@ static int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb, iwl_stop_queue(trans, txq, "Queue is full"); } } + spin_unlock(&txq->lock); return 0; + out_err: + spin_unlock(&txq->lock); + return -1; } static int iwl_trans_pcie_start_hw(struct iwl_trans *trans) @@ -1560,6 +1563,8 @@ static int iwl_trans_pcie_reclaim(struct iwl_trans *trans, int sta_id, int tid, int tfd_num = ssn & (txq->q.n_bd - 1); int freed = 0; + spin_lock(&txq->lock); + txq->time_stamp = jiffies; if (unlikely(txq_id >= IWLAGN_FIRST_AMPDU_QUEUE && @@ -1574,6 +1579,7 @@ static int iwl_trans_pcie_reclaim(struct iwl_trans *trans, int sta_id, int tid, IWL_DEBUG_TX_QUEUES(trans, "Bad queue mapping txq_id %d, " "agg_txq[sta_id[tid] %d", txq_id, trans_pcie->agg_txq[sta_id][tid]); + spin_unlock(&txq->lock); return 1; } @@ -1587,6 +1593,8 @@ static int iwl_trans_pcie_reclaim(struct iwl_trans *trans, int sta_id, int tid, status != TX_STATUS_FAIL_PASSIVE_NO_RX)) iwl_wake_queue(trans, txq, "Packets reclaimed"); } + + spin_unlock(&txq->lock); return 0; } @@ -2267,7 +2275,6 @@ struct iwl_trans *iwl_trans_pcie_alloc(struct iwl_shared *shrd, trans->ops = &trans_ops_pcie; trans->shrd = shrd; trans_pcie->trans = trans; - spin_lock_init(&trans->hcmd_lock); spin_lock_init(&trans_pcie->irq_lock); /* W/A - seems to solve weird behavior. We need to remove this if we diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h index 4e7e6c0..e2f21cf 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans.h +++ b/drivers/net/wireless/iwlwifi/iwl-trans.h @@ -309,7 +309,6 @@ enum iwl_trans_state { * @ops - pointer to iwl_trans_ops * @op_mode - pointer to the op_mode * @shrd - pointer to iwl_shared which holds shared data from the upper layer - * @hcmd_lock: protects HCMD * @reg_lock - protect hw register access * @dev - pointer to struct device * that represents the device * @irq - the irq number for the device @@ -326,7 +325,6 @@ struct iwl_trans { struct iwl_op_mode *op_mode; struct iwl_shared *shrd; enum iwl_trans_state state; - spinlock_t hcmd_lock; spinlock_t reg_lock; struct device *dev;