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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 <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2012-03-05 11:24:24 -08:00 committed by John W. Linville
parent 9451ca1a31
commit 015c15e106
4 changed files with 33 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/iwlwifi/iwl-trans-pcie-int.h
View File

@ -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;

20
drivers/net/wireless/iwlwifi/iwl-trans-pcie-tx.c
View File

@ -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);

31
drivers/net/wireless/iwlwifi/iwl-trans-pcie.c
View File

@ -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

2
drivers/net/wireless/iwlwifi/iwl-trans.h
View File

@ -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;