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linux/drivers/net/wireless/iwlwifi/pcie/tx.c

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/******************************************************************************
*
* 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 <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-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;
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);
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);
}
out_meta->flags = cmd->flags;
txq->need_update = 1;
trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size,
&out_cmd->hdr, copy_size);
/* 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;
}
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