From 0cd58eaab1482ab75800f68cd0033286232827f1 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Tue, 24 Nov 2015 13:24:24 +0200 Subject: [PATCH] iwlwifi: pcie: allow the op_mode to block the tx queues In certain flows (see next patches), the op_mode may need to block the Tx queues for a short period. Provide an API for that. The transport is in charge of counting the number of times the queues are blocked since the op_mode may block the queues several times in a row before unblocking them. Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/intel/iwlwifi/iwl-trans.h | 16 +++++++++++++ drivers/net/wireless/intel/iwlwifi/pcie/internal.h | 1 + drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 28 ++++++++++++++++++++++ drivers/net/wireless/intel/iwlwifi/pcie/tx.c | 4 +++- 4 files changed, 48 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h index 3d089ae..0cd69cd 100644 --- a/drivers/net/wireless/intel/iwlwifi/iwl-trans.h +++ b/drivers/net/wireless/intel/iwlwifi/iwl-trans.h @@ -542,6 +542,11 @@ struct iwl_trans_txq_scd_cfg { * @wait_tx_queue_empty: wait until tx queues are empty. May sleep. * @freeze_txq_timer: prevents the timer of the queue from firing until the * queue is set to awake. Must be atomic. + * @block_txq_ptrs: stop updating the write pointers of the Tx queues. Note + * that the transport needs to refcount the calls since this function + * will be called several times with block = true, and then the queues + * need to be unblocked only after the same number of calls with + * block = false. * @write8: write a u8 to a register at offset ofs from the BAR * @write32: write a u32 to a register at offset ofs from the BAR * @read32: read a u32 register at offset ofs from the BAR @@ -600,6 +605,7 @@ struct iwl_trans_ops { int (*wait_tx_queue_empty)(struct iwl_trans *trans, u32 txq_bm); void (*freeze_txq_timer)(struct iwl_trans *trans, unsigned long txqs, bool freeze); + void (*block_txq_ptrs)(struct iwl_trans *trans, bool block); void (*write8)(struct iwl_trans *trans, u32 ofs, u8 val); void (*write32)(struct iwl_trans *trans, u32 ofs, u32 val); @@ -1010,6 +1016,16 @@ static inline void iwl_trans_freeze_txq_timer(struct iwl_trans *trans, trans->ops->freeze_txq_timer(trans, txqs, freeze); } +static inline void iwl_trans_block_txq_ptrs(struct iwl_trans *trans, + bool block) +{ + if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) + IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state); + + if (trans->ops->block_txq_ptrs) + trans->ops->block_txq_ptrs(trans, block); +} + static inline int iwl_trans_wait_tx_queue_empty(struct iwl_trans *trans, u32 txqs) { diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h index 44dc09d..31f30a2 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h +++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h @@ -278,6 +278,7 @@ struct iwl_txq { bool frozen; u8 active; bool ampdu; + bool block; unsigned long wd_timeout; }; diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index efef487..316162a 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c @@ -1673,6 +1673,33 @@ next_queue: } } +static void iwl_trans_pcie_block_txq_ptrs(struct iwl_trans *trans, bool block) +{ + 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 (i == trans_pcie->cmd_queue) + continue; + + spin_lock_bh(&txq->lock); + + if (!block && !(WARN_ON_ONCE(!txq->block))) { + txq->block--; + if (!txq->block) { + iwl_write32(trans, HBUS_TARG_WRPTR, + txq->q.write_ptr | (i << 8)); + } + } else if (block) { + txq->block++; + } + + spin_unlock_bh(&txq->lock); + } +} + #define IWL_FLUSH_WAIT_MS 2000 static int iwl_trans_pcie_wait_txq_empty(struct iwl_trans *trans, u32 txq_bm) @@ -2467,6 +2494,7 @@ static const struct iwl_trans_ops trans_ops_pcie = { .wait_tx_queue_empty = iwl_trans_pcie_wait_txq_empty, .freeze_txq_timer = iwl_trans_pcie_freeze_txq_timer, + .block_txq_ptrs = iwl_trans_pcie_block_txq_ptrs, .write8 = iwl_trans_pcie_write8, .write32 = iwl_trans_pcie_write32, diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c index a8c8a4a..95ba920 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/tx.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/tx.c @@ -318,7 +318,9 @@ static void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans *trans, * trying to tx (during RFKILL, we're not trying to tx). */ IWL_DEBUG_TX(trans, "Q:%d WR: 0x%x\n", txq_id, txq->q.write_ptr); - iwl_write32(trans, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8)); + if (!txq->block) + iwl_write32(trans, HBUS_TARG_WRPTR, + txq->q.write_ptr | (txq_id << 8)); } void iwl_pcie_txq_check_wrptrs(struct iwl_trans *trans) -- 2.7.4