- 根目录:
- drivers
- net
- wireless
- iwlwifi
- pcie
- tx.c
/******************************************************************************
*
* Copyright(c) 2003 - 2014 Intel Corporation. All rights reserved.
* Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
*
* 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-scd.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
/*************** 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.
*
***************************************************/
static int iwl_queue_space(const struct iwl_queue *q)
{
unsigned int max;
unsigned int used;
/*
* To avoid ambiguity between empty and completely full queues, there
* should always be less than TFD_QUEUE_SIZE_MAX elements in the queue.
* If q->n_window is smaller than TFD_QUEUE_SIZE_MAX, there is no need
* to reserve any queue entries for this purpose.
*/
if (q->n_window < TFD_QUEUE_SIZE_MAX)
max = q->n_window;
else
max = TFD_QUEUE_SIZE_MAX - 1;
/*
* TFD_QUEUE_SIZE_MAX is a power of 2, so the following is equivalent to
* modulo by TFD_QUEUE_SIZE_MAX and is well defined.
*/
used = (q->write_ptr - q->read_ptr) & (TFD_QUEUE_SIZE_MAX - 1);
if (WARN_ON(used > max))
return 0;
return max - used;
}
/*
* iwl_queue_init - Initialize queue's high/low-water and read/write indexes
*/
static int iwl_queue_init(struct iwl_queue *q, int slots_num, u32 id)
{
q->n_window = slots_num;
q->id = id;
/* 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 = 0;
q->read_ptr = 0;
return 0;
}
static int iwl_pcie_alloc_dma_ptr(struct iwl_trans *trans,
struct iwl_dma_ptr *ptr, size_t size)
{
if (WARN_ON(ptr->addr))
return -EINVAL;
ptr->addr = dma_alloc_coherent(trans->dev, size,
&ptr->dma, GFP_KERNEL);
if (!ptr->addr)
return -ENOMEM;
ptr->size = size;
return 0;
}
static void iwl_pcie_free_dma_ptr(struct iwl_trans *trans,
struct iwl_dma_ptr *ptr)
{
if (unlikely(!ptr->addr))
return;
dma_free_coherent(trans->dev, ptr->size, ptr->addr, ptr->dma);
memset(ptr, 0, sizeof(*ptr));
}
static void iwl_pcie_txq_stuck_timer(unsigned long data)
{
struct iwl_txq *txq = (void *)data;
struct iwl_trans_pcie *trans_pcie = txq->trans_pcie;
struct iwl_trans *trans = iwl_trans_pcie_get_trans(trans_pcie);
u32 scd_sram_addr = trans_pcie->scd_base_addr +
SCD_TX_STTS_QUEUE_OFFSET(txq->q.id);
u8 buf[16];
int i;
spin_lock(&txq->lock);
/* check if triggered erroneously */
if (txq->q.read_ptr == txq->q.write_ptr) {
spin_unlock(&txq->lock);
return;
}
spin_unlock(&txq->lock);
IWL_ERR(trans, "Queue %d stuck for %u ms.\n", txq->q.id,
jiffies_to_msecs(txq->wd_timeout));
IWL_ERR(trans, "Current SW read_ptr %d write_ptr %d\n",
txq->q.read_ptr, txq->q.write_ptr);
iwl_trans_read_mem_bytes(trans, scd_sram_addr, buf, sizeof(buf));
iwl_print_hex_error(trans, buf, sizeof(buf));
for (i = 0; i < FH_TCSR_CHNL_NUM; i++)
IWL_ERR(trans, "FH TRBs(%d) = 0x%08x\n", i,
iwl_read_direct32(trans, FH_TX_TRB_REG(i)));
for (i = 0; i < trans->cfg->base_params->num_of_queues; i++) {
u32 status = iwl_read_prph(trans, SCD_QUEUE_STATUS_BITS(i));
u8 fifo = (status >> SCD_QUEUE_STTS_REG_POS_TXF) & 0x7;
bool active = !!(status & BIT(SCD_QUEUE_STTS_REG_POS_ACTIVE));
u32 tbl_dw =
iwl_trans_read_mem32(trans,
trans_pcie->scd_base_addr +
SCD_TRANS_TBL_OFFSET_QUEUE(i));
if (i & 0x1)
tbl_dw = (tbl_dw & 0xFFFF0000) >> 16;
else
tbl_dw = tbl_dw & 0x0000FFFF;
IWL_ERR(trans,
"Q %d is %sactive and mapped to fifo %d ra_tid 0x%04x [%d,%d]\n",
i, active ? "" : "in", fifo, tbl_dw,
iwl_read_prph(trans, SCD_QUEUE_RDPTR(i)) &
(TFD_QUEUE_SIZE_MAX - 1),
iwl_read_prph(trans, SCD_QUEUE_WRPTR(i)));
}
iwl_force_nmi(trans);
}
/*
* iwl_pcie_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
*/
static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans *trans,
struct iwl_txq *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;
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 += IEEE80211_CCMP_MIC_LEN;
break;
case TX_CMD_SEC_TKIP:
len += IEEE80211_TKIP_ICV_LEN;
break;
case TX_CMD_SEC_WEP:
len += IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN;
break;
}
if (trans_pcie->bc_table_dword)
len = DIV_ROUND_UP(len, 4);
if (WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX))
return;
bc_ent = cpu_to_le16(len | (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;
}
static void iwl_pcie_txq_inval_byte_cnt_tbl(struct iwl_trans *trans,
struct iwl_txq *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;
}
/*
* iwl_pcie_txq_inc_wr_ptr - Send new write index to hardware
*/
static void iwl_pcie_txq_inc_wr_ptr(struct iwl_trans *trans,
struct iwl_txq *txq)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
u32 reg = 0;
int txq_id = txq->q.id;
lockdep_assert_held(&txq->lock);
/*
* explicitly wake up the NIC if:
* 1. shadow registers aren't enabled
* 2. NIC is woken up for CMD regardless of shadow outside this function
* 3. there is a chance that the NIC is asleep
*/
if (!trans->cfg->base_params->shadow_reg_enable &&
txq_id != trans_pcie->cmd_queue &&
test_bit(STATUS_TPOWER_PMI, &trans->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);
txq->need_update = true;
return;
}
}
/*
* if not in power-save mode, uCode will never sleep when we're
* 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));
}
void iwl_pcie_txq_check_wrptrs(struct iwl_trans *trans)
{
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];
spin_lock_bh(&txq->lock);
if (trans_pcie->txq[i].need_update) {
iwl_pcie_txq_inc_wr_ptr(trans, txq);
trans_pcie->txq[i].need_update = false;
}
spin_unlock_bh(&txq->lock);
}
}
static inline dma_addr_t iwl_pcie_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 void iwl_pcie_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_pcie_tfd_get_num_tbs(struct iwl_tfd *tfd)
{
return tfd->num_tbs & 0x1f;
}
static void iwl_pcie_tfd_unmap(struct iwl_trans *trans,
struct iwl_cmd_meta *meta,
struct iwl_tfd *tfd)
{
int i;
int num_tbs;
/* Sanity check on number of chunks */
num_tbs = iwl_pcie_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;
}
/* first TB is never freed - it's the scratchbuf data */
for (i = 1; i < num_tbs; i++) {
if (meta->flags & BIT(i + CMD_TB_BITMAP_POS))
dma_unmap_page(trans->dev,
iwl_pcie_tfd_tb_get_addr(tfd, i),
iwl_pcie_tfd_tb_get_len(tfd, i),
DMA_TO_DEVICE);
else
dma_unmap_single(trans->dev,
iwl_pcie_tfd_tb_get_addr(tfd, i),
iwl_pcie_tfd_tb_get_len(tfd, i),
DMA_TO_DEVICE);
}
tfd->num_tbs = 0;
}
/*
* iwl_pcie_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)
*/
static void iwl_pcie_txq_free_tfd(struct iwl_trans *trans, struct iwl_txq *txq)
{
struct iwl_tfd *tfd_tmp = txq->tfds;
/* rd_ptr is bounded by TFD_QUEUE_SIZE_MAX 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
* TFD_QUEUE_SIZE_MAX tfds
*/
iwl_pcie_tfd_unmap(trans, &txq->entries[idx].meta, &tfd_tmp[rd_ptr]);
/* 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;
}
}
}
static int iwl_pcie_txq_build_tfd(struct iwl_trans *trans, struct iwl_txq *txq,
dma_addr_t addr, u16 len, bool 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_pcie_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(addr & ~IWL_TX_DMA_MASK,
"Unaligned address = %llx\n", (unsigned long long)addr))
return -EINVAL;
iwl_pcie_tfd_set_tb(tfd, num_tbs, addr, len);
return num_tbs;
}
static int iwl_pcie_txq_alloc(struct iwl_trans *trans,
struct iwl_txq *txq, int slots_num,
u32 txq_id)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
size_t tfd_sz = sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX;
size_t scratchbuf_sz;
int i;
if (WARN_ON(txq->entries || txq->tfds))
return -EINVAL;
setup_timer(&txq->stuck_timer, iwl_pcie_txq_stuck_timer,
(unsigned long)txq);
txq->trans_pcie = trans_pcie;
txq->q.n_window = slots_num;
txq->entries = kcalloc(slots_num,
sizeof(struct iwl_pcie_txq_entry),
GFP_KERNEL);
if (!txq->entries)
goto error;
if (txq_id == trans_pcie->cmd_queue)
for (i = 0; i < slots_num; i++) {
txq->entries[i].cmd =
kmalloc(sizeof(struct iwl_device_cmd),
GFP_KERNEL);
if (!txq->entries[i].cmd)
goto error;
}
/* Circular buffer of transmit frame descriptors (TFDs),
* shared with device */
txq->tfds = dma_alloc_coherent(trans->dev, tfd_sz,
&txq->q.dma_addr, GFP_KERNEL);
if (!txq->tfds)
goto error;
BUILD_BUG_ON(IWL_HCMD_SCRATCHBUF_SIZE != sizeof(*txq->scratchbufs));
BUILD_BUG_ON(offsetof(struct iwl_pcie_txq_scratch_buf, scratch) !=
sizeof(struct iwl_cmd_header) +
offsetof(struct iwl_tx_cmd, scratch));
scratchbuf_sz = sizeof(*txq->scratchbufs) * slots_num;
txq->scratchbufs = dma_alloc_coherent(trans->dev, scratchbuf_sz,
&txq->scratchbufs_dma,
GFP_KERNEL);
if (!txq->scratchbufs)
goto err_free_tfds;
txq->q.id = txq_id;
return 0;
err_free_tfds:
dma_free_coherent(trans->dev, tfd_sz, txq->tfds, txq->q.dma_addr);
error:
if (txq->entries && txq_id == trans_pcie->cmd_queue)
for (i = 0; i < slots_num; i++)
kfree(txq->entries[i].cmd);
kfree(txq->entries);
txq->entries = NULL;
return -ENOMEM;
}
static int iwl_pcie_txq_init(struct iwl_trans *trans, struct iwl_txq *txq,
int slots_num, u32 txq_id)
{
int ret;
txq->need_update = false;
/* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
* iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
/* Initialize queue's high/low-water marks, and head/tail indexes */
ret = iwl_queue_init(&txq->q, slots_num, txq_id);
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.
* Circular buffer (TFD queue in DRAM) physical base address */
iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(txq_id),
txq->q.dma_addr >> 8);
return 0;
}
/*
* iwl_pcie_txq_unmap - Unmap any remaining DMA mappings and free skb's
*/
static void iwl_pcie_txq_unmap(struct iwl_trans *trans, int txq_id)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
struct iwl_txq *txq = &trans_pcie->txq[txq_id];
struct iwl_queue *q = &txq->q;
spin_lock_bh(&txq->lock);
while (q->write_ptr != q->read_ptr) {
IWL_DEBUG_TX_REPLY(trans, "Q %d Free %d\n",
txq_id, q->read_ptr);
iwl_pcie_txq_free_tfd(trans, txq);
q->read_ptr = iwl_queue_inc_wrap(q->read_ptr);
}
txq->active = false;
spin_unlock_bh(&txq->lock);
/* just in case - this queue may have been stopped */
iwl_wake_queue(trans, txq);
}
/*
* iwl_pcie_txq_free - Deallocate DMA queue.
* @txq: Transmit queue to deallocate.
*
* Empty queue by removing and destroying all BD's.
* Free all buffers.
* 0-fill, but do not free "txq" descriptor structure.
*/
static void iwl_pcie_txq_free(struct iwl_trans *trans, int txq_id)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
struct iwl_txq *txq = &trans_pcie->txq[txq_id];
struct device *dev = trans->dev;
int i;
if (WARN_ON(!txq))
return;
iwl_pcie_txq_unmap(trans, txq_id);
/* De-alloc array of command/tx buffers */
if (txq_id == trans_pcie->cmd_queue)
for (i = 0; i < txq->q.n_window; i++) {
kzfree(txq->entries[i].cmd);
kzfree(txq->entries[i].free_buf);
}
/* De-alloc circular buffer of TFDs */
if (txq->tfds) {
dma_free_coherent(dev,
sizeof(struct iwl_tfd) * TFD_QUEUE_SIZE_MAX,
txq->tfds, txq->q.dma_addr);
txq->q.dma_addr = 0;
txq->tfds = NULL;
dma_free_coherent(dev,
sizeof(*txq->scratchbufs) * txq->q.n_window,
txq->scratchbufs, txq->scratchbufs_dma);
}
kfree(txq->entries);
txq->entries = NULL;
del_timer_sync(&txq->stuck_timer);
/* 0-fill queue descriptor structure */
memset(txq, 0, sizeof(*txq));
}
void iwl_pcie_tx_start(struct iwl_trans *trans, u32 scd_base_addr)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
int nq = trans->cfg->base_params->num_of_queues;
int chan;
u32 reg_val;
int clear_dwords = (SCD_TRANS_TBL_OFFSET_QUEUE(nq) -
SCD_CONTEXT_MEM_LOWER_BOUND) / sizeof(u32);
/* make sure all queue are not stopped/used */
memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
trans_pcie->scd_base_addr =
iwl_read_prph(trans, SCD_SRAM_BASE_ADDR);
WARN_ON(scd_base_addr != 0 &&
scd_base_addr != trans_pcie->scd_base_addr);
/* reset context data, TX status and translation data */
iwl_trans_write_mem(trans, trans_pcie->scd_base_addr +
SCD_CONTEXT_MEM_LOWER_BOUND,
NULL, clear_dwords);
iwl_write_prph(trans, SCD_DRAM_BASE_ADDR,
trans_pcie->scd_bc_tbls.dma >> 10);
/* The chain extension of the SCD doesn't work well. This feature is
* enabled by default by the HW, so we need to disable it manually.
*/
if (trans->cfg->base_params->scd_chain_ext_wa)
iwl_write_prph(trans, SCD_CHAINEXT_EN, 0);
iwl_trans_ac_txq_enable(trans, trans_pcie->cmd_queue,
trans_pcie->cmd_fifo,
trans_pcie->cmd_q_wdg_timeout);
/* Activate all Tx DMA/FIFO channels */
iwl_scd_activate_fifos(trans);
/* Enable DMA channel */
for (chan = 0; chan < FH_TCSR_CHNL_NUM; chan++)
iwl_write_direct32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);
/* Update FH chicken bits */
reg_val = iwl_read_direct32(trans, FH_TX_CHICKEN_BITS_REG);
iwl_write_direct32(trans, FH_TX_CHICKEN_BITS_REG,
reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);
/* Enable L1-Active */
if (trans->cfg->device_family != IWL_DEVICE_FAMILY_8000)
iwl_clear_bits_prph(trans, APMG_PCIDEV_STT_REG,
APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
}
void iwl_trans_pcie_tx_reset(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 < trans->cfg->base_params->num_of_queues;
txq_id++) {
struct iwl_txq *txq = &trans_pcie->txq[txq_id];
iwl_write_direct32(trans, FH_MEM_CBBC_QUEUE(txq_id),
txq->q.dma_addr >> 8);
iwl_pcie_txq_unmap(trans, txq_id);
txq->q.read_ptr = 0;
txq->q.write_ptr = 0;
}
/* Tell NIC where to find the "keep warm" buffer */
iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
trans_pcie->kw.dma >> 4);
/*
* Send 0 as the scd_base_addr since the device may have be reset
* while we were in WoWLAN in which case SCD_SRAM_BASE_ADDR will
* contain garbage.
*/
iwl_pcie_tx_start(trans, 0);
}
static void iwl_pcie_tx_stop_fh(struct iwl_trans *trans)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
unsigned long flags;
int ch, ret;
u32 mask = 0;
spin_lock(&trans_pcie->irq_lock);
if (!iwl_trans_grab_nic_access(trans, false, &flags))
goto out;
/* Stop each Tx DMA channel */
for (ch = 0; ch < FH_TCSR_CHNL_NUM; ch++) {
iwl_write32(trans, FH_TCSR_CHNL_TX_CONFIG_REG(ch), 0x0);
mask |= FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE(ch);
}
/* Wait for DMA channels to be idle */
ret = iwl_poll_bit(trans, FH_TSSR_TX_STATUS_REG, mask, mask, 5000);
if (ret < 0)
IWL_ERR(trans,
"Failing on timeout while stopping DMA channel %d [0x%08x]\n",
ch, iwl_read32(trans, FH_TSSR_TX_STATUS_REG));
iwl_trans_release_nic_access(trans, &flags);
out:
spin_unlock(&trans_pcie->irq_lock);
}
/*
* iwl_pcie_tx_stop - Stop all Tx DMA channels
*/
int iwl_pcie_tx_stop(struct iwl_trans *trans)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
int txq_id;
/* Turn off all Tx DMA fifos */
iwl_scd_deactivate_fifos(trans);
/* Turn off all Tx DMA channels */
iwl_pcie_tx_stop_fh(trans);
/*
* This function can be called before the op_mode disabled the
* queues. This happens when we have an rfkill interrupt.
* Since we stop Tx altogether - mark the queues as stopped.
*/
memset(trans_pcie->queue_stopped, 0, sizeof(trans_pcie->queue_stopped));
memset(trans_pcie->queue_used, 0, sizeof(trans_pcie->queue_used));
/* This can happen: start_hw, stop_device */
if (!trans_pcie->txq)
return 0;
/* Unmap DMA from host system and free skb's */
for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
txq_id++)
iwl_pcie_txq_unmap(trans, txq_id);
return 0;
}
/*
* iwl_trans_tx_free - Free TXQ Context
*
* Destroy all TX DMA queues and structures
*/
void iwl_pcie_tx_free(struct iwl_trans *trans)
{
int txq_id;
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
/* Tx queues */
if (trans_pcie->txq) {
for (txq_id = 0;
txq_id < trans->cfg->base_params->num_of_queues; txq_id++)
iwl_pcie_txq_free(trans, txq_id);
}
kfree(trans_pcie->txq);
trans_pcie->txq = NULL;
iwl_pcie_free_dma_ptr(trans, &trans_pcie->kw);
iwl_pcie_free_dma_ptr(trans, &trans_pcie->scd_bc_tbls);
}
/*
* iwl_pcie_tx_alloc - allocate TX context
* Allocate all Tx DMA structures and initialize them
*/
static int iwl_pcie_tx_alloc(struct iwl_trans *trans)
{
int ret;
int txq_id, slots_num;
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
u16 scd_bc_tbls_size = trans->cfg->base_params->num_of_queues *
sizeof(struct iwlagn_scd_bc_tbl);
/*It is not allowed to alloc twice, so warn when this happens.
* We cannot rely on the previous allocation, so free and fail */
if (WARN_ON(trans_pcie->txq)) {
ret = -EINVAL;
goto error;
}
ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->scd_bc_tbls,
scd_bc_tbls_size);
if (ret) {
IWL_ERR(trans, "Scheduler BC Table allocation failed\n");
goto error;
}
/* Alloc keep-warm buffer */
ret = iwl_pcie_alloc_dma_ptr(trans, &trans_pcie->kw, IWL_KW_SIZE);
if (ret) {
IWL_ERR(trans, "Keep Warm allocation failed\n");
goto error;
}
trans_pcie->txq = kcalloc(trans->cfg->base_params->num_of_queues,
sizeof(struct iwl_txq), GFP_KERNEL);
if (!trans_pcie->txq) {
IWL_ERR(trans, "Not enough memory for txq\n");
ret = -ENOMEM;
goto error;
}
/* Alloc and init all Tx queues, including the command queue (#4/#9) */
for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
txq_id++) {
slots_num = (txq_id == trans_pcie->cmd_queue) ?
TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
ret = iwl_pcie_txq_alloc(trans, &trans_pcie->txq[txq_id],
slots_num, txq_id);
if (ret) {
IWL_ERR(trans, "Tx %d queue alloc failed\n", txq_id);
goto error;
}
}
return 0;
error:
iwl_pcie_tx_free(trans);
return ret;
}
int iwl_pcie_tx_init(struct iwl_trans *trans)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
int ret;
int txq_id, slots_num;
bool alloc = false;
if (!trans_pcie->txq) {
ret = iwl_pcie_tx_alloc(trans);
if (ret)
goto error;
alloc = true;
}
spin_lock(&trans_pcie->irq_lock);
/* Turn off all Tx DMA fifos */
iwl_scd_deactivate_fifos(trans);
/* Tell NIC where to find the "keep warm" buffer */
iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
trans_pcie->kw.dma >> 4);
spin_unlock(&trans_pcie->irq_lock);
/* Alloc and init all Tx queues, including the command queue (#4/#9) */
for (txq_id = 0; txq_id < trans->cfg->base_params->num_of_queues;
txq_id++) {
slots_num = (txq_id == trans_pcie->cmd_queue) ?
TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
ret = iwl_pcie_txq_init(trans, &trans_pcie->txq[txq_id],
slots_num, txq_id);
if (ret) {
IWL_ERR(trans, "Tx %d queue init failed\n", txq_id);
goto error;
}
}
iwl_set_bits_prph(trans, SCD_GP_CTRL, SCD_GP_CTRL_AUTO_ACTIVE_MODE);
if (trans->cfg->base_params->num_of_queues > 20)
iwl_set_bits_prph(trans, SCD_GP_CTRL,
SCD_GP_CTRL_ENABLE_31_QUEUES);
return 0;
error:
/*Upon error, free only if we allocated something */
if (alloc)
iwl_pcie_tx_free(trans);
return ret;
}
static inline void iwl_pcie_txq_progress(struct iwl_txq *txq)
{
lockdep_assert_held(&txq->lock);
if (!txq->wd_timeout)
return;
/*
* station is asleep and we send data - that must
* be uAPSD or PS-Poll. Don't rearm the timer.
*/
if (txq->frozen)
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 + txq->wd_timeout);
}
/* Frees buffers until index _not_ inclusive */
void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
struct sk_buff_head *skbs)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
struct iwl_txq *txq = &trans_pcie->txq[txq_id];
int tfd_num = ssn & (TFD_QUEUE_SIZE_MAX - 1);
struct iwl_queue *q = &txq->q;
int last_to_free;
/* This function is not meant to release cmd queue*/
if (WARN_ON(txq_id == trans_pcie->cmd_queue))
return;
spin_lock_bh(&txq->lock);
if (!txq->active) {
IWL_DEBUG_TX_QUEUES(trans, "Q %d inactive - ignoring idx %d\n",
txq_id, ssn);
goto out;
}
if (txq->q.read_ptr == tfd_num)
goto out;
IWL_DEBUG_TX_REPLY(trans, "[Q %d] %d -> %d (%d)\n",
txq_id, txq->q.read_ptr, tfd_num, ssn);
/*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(tfd_num);
if (!iwl_queue_used(q, last_to_free)) {
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, TFD_QUEUE_SIZE_MAX,
q->write_ptr, q->read_ptr);
goto out;
}
if (WARN_ON(!skb_queue_empty(skbs)))
goto out;
for (;
q->read_ptr != tfd_num;
q->read_ptr = iwl_queue_inc_wrap(q->read_ptr)) {
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;
iwl_pcie_txq_inval_byte_cnt_tbl(trans, txq);
iwl_pcie_txq_free_tfd(trans, txq);
}
iwl_pcie_txq_progress(txq);
if (iwl_queue_space(&txq->q) > txq->q.low_mark)
iwl_wake_queue(trans, txq);
if (q->read_ptr == q->write_ptr) {
IWL_DEBUG_RPM(trans, "Q %d - last tx reclaimed\n", q->id);
iwl_trans_pcie_unref(trans);
}
out:
spin_unlock_bh(&txq->lock);
}
static int iwl_pcie_set_cmd_in_flight(struct iwl_trans *trans,
const struct iwl_host_cmd *cmd)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
int ret;
lockdep_assert_held(&trans_pcie->reg_lock);
if (!(cmd->flags & CMD_SEND_IN_IDLE) &&
!trans_pcie->ref_cmd_in_flight) {
trans_pcie->ref_cmd_in_flight = true;
IWL_DEBUG_RPM(trans, "set ref_cmd_in_flight - ref\n");
iwl_trans_pcie_ref(trans);
}
/*
* wake up the NIC to make sure that the firmware will see the host
* command - we will let the NIC sleep once all the host commands
* returned. This needs to be done only on NICs that have
* apmg_wake_up_wa set.
*/
if (trans->cfg->base_params->apmg_wake_up_wa &&
!trans_pcie->cmd_hold_nic_awake) {
__iwl_trans_pcie_set_bit(trans, CSR_GP_CNTRL,
CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
ret = iwl_poll_bit(trans, CSR_GP_CNTRL,
CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
(CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP),
15000);
if (ret < 0) {
__iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
IWL_ERR(trans, "Failed to wake NIC for hcmd\n");
return -EIO;
}
trans_pcie->cmd_hold_nic_awake = true;
}
return 0;
}
static int iwl_pcie_clear_cmd_in_flight(struct iwl_trans *trans)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
lockdep_assert_held(&trans_pcie->reg_lock);
if (trans_pcie->ref_cmd_in_flight) {
trans_pcie->ref_cmd_in_flight = false;
IWL_DEBUG_RPM(trans, "clear ref_cmd_in_flight - unref\n");
iwl_trans_pcie_unref(trans);
}
if (trans->cfg->base_params->apmg_wake_up_wa) {
if (WARN_ON(!trans_pcie->cmd_hold_nic_awake))
return 0;
trans_pcie->cmd_hold_nic_awake = false;
__iwl_trans_pcie_clear_bit(trans, CSR_GP_CNTRL,
CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
}
return 0;
}
/*
* iwl_pcie_cmdq_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_pcie_cmdq_reclaim(struct iwl_trans *trans, int txq_id, int idx)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
struct iwl_txq *txq = &trans_pcie->txq[txq_id];
struct iwl_queue *q = &txq->q;
unsigned long flags;
int nfreed = 0;
lockdep_assert_held(&txq->lock);
if ((idx >= TFD_QUEUE_SIZE_MAX) || (!iwl_queue_used(q, idx))) {
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, TFD_QUEUE_SIZE_MAX,
q->write_ptr, q->read_ptr);
return;
}
for (idx = iwl_queue_inc_wrap(idx); q->read_ptr != idx;
q->read_ptr = iwl_queue_inc_wrap(q->read_ptr)) {
if (nfreed++ > 0) {
IWL_ERR(trans, "HCMD skipped: index (%d) %d %d\n",
idx, q->write_ptr, q->read_ptr);
iwl_force_nmi(trans);
}
}
if (q->read_ptr == q->write_ptr) {
spin_lock_irqsave(&trans_pcie->reg_lock, flags);
iwl_pcie_clear_cmd_in_flight(trans);
spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
}
iwl_pcie_txq_progress(txq);
}
static int iwl_pcie_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_trans_read_mem32(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_trans_write_mem32(trans, tbl_dw_addr, tbl_dw);
return 0;
}
/* Receiver address (actually, Rx station's index into station table),
* combined with Traffic ID (QOS priority), in format used by Tx Scheduler */
#define BUILD_RAxTID(sta_id, tid) (((sta_id) << 4) + (tid))
void iwl_trans_pcie_txq_enable(struct iwl_trans *trans, int txq_id, u16 ssn,
const struct iwl_trans_txq_scd_cfg *cfg,
unsigned int wdg_timeout)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
struct iwl_txq *txq = &trans_pcie->txq[txq_id];
int fifo = -1;
if (test_and_set_bit(txq_id, trans_pcie->queue_used))
WARN_ONCE(1, "queue %d already used - expect issues", txq_id);
txq->wd_timeout = msecs_to_jiffies(wdg_timeout);
if (cfg) {
fifo = cfg->fifo;
/* Disable the scheduler prior configuring the cmd queue */
if (txq_id == trans_pcie->cmd_queue &&
trans_pcie->scd_set_active)
iwl_scd_enable_set_active(trans, 0);
/* Stop this Tx queue before configuring it */
iwl_scd_txq_set_inactive(trans, txq_id);
/* Set this queue as a chain-building queue unless it is CMD */
if (txq_id != trans_pcie->cmd_queue)
iwl_scd_txq_set_chain(trans, txq_id);
if (cfg->aggregate) {
u16 ra_tid = BUILD_RAxTID(cfg->sta_id, cfg->tid);
/* Map receiver-address / traffic-ID to this queue */
iwl_pcie_txq_set_ratid_map(trans, ra_tid, txq_id);
/* enable aggregations for the queue */
iwl_scd_txq_enable_agg(trans, txq_id);
txq->ampdu = true;
} 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_scd_txq_disable_agg(trans, txq_id);
ssn = txq->q.read_ptr;
}
}
/* Place first TFD at index corresponding to start sequence number.
* Assumes that ssn_idx is valid (!= 0xFFF) */
txq->q.read_ptr = (ssn & 0xff);
txq->q.write_ptr = (ssn & 0xff);
iwl_write_direct32(trans, HBUS_TARG_WRPTR,
(ssn & 0xff) | (txq_id << 8));
if (cfg) {
u8 frame_limit = cfg->frame_limit;
iwl_write_prph(trans, SCD_QUEUE_RDPTR(txq_id), ssn);
/* Set up Tx window size and frame limit for this queue */
iwl_trans_write_mem32(trans, trans_pcie->scd_base_addr +
SCD_CONTEXT_QUEUE_OFFSET(txq_id), 0);
iwl_trans_write_mem32(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 */
iwl_write_prph(trans, SCD_QUEUE_STATUS_BITS(txq_id),
(1 << SCD_QUEUE_STTS_REG_POS_ACTIVE) |
(cfg->fifo << SCD_QUEUE_STTS_REG_POS_TXF) |
(1 << SCD_QUEUE_STTS_REG_POS_WSL) |
SCD_QUEUE_STTS_REG_MSK);
/* enable the scheduler for this queue (only) */
if (txq_id == trans_pcie->cmd_queue &&
trans_pcie->scd_set_active)
iwl_scd_enable_set_active(trans, BIT(txq_id));
IWL_DEBUG_TX_QUEUES(trans,
"Activate queue %d on FIFO %d WrPtr: %d\n",
txq_id, fifo, ssn & 0xff);
} else {
IWL_DEBUG_TX_QUEUES(trans,
"Activate queue %d WrPtr: %d\n",
txq_id, ssn & 0xff);
}
txq->active = true;
}
void iwl_trans_pcie_txq_disable(struct iwl_trans *trans, int txq_id,
bool configure_scd)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
u32 stts_addr = trans_pcie->scd_base_addr +
SCD_TX_STTS_QUEUE_OFFSET(txq_id);
static const u32 zero_val[4] = {};
trans_pcie->txq[txq_id].frozen_expiry_remainder = 0;
trans_pcie->txq[txq_id].frozen = false;
/*
* Upon HW Rfkill - we stop the device, and then stop the queues
* in the op_mode. Just for the sake of the simplicity of the op_mode,
* allow the op_mode to call txq_disable after it already called
* stop_device.
*/
if (!test_and_clear_bit(txq_id, trans_pcie->queue_used)) {
WARN_ONCE(test_bit(STATUS_DEVICE_ENABLED, &trans->status),
"queue %d not used", txq_id);
return;
}
if (configure_scd) {
iwl_scd_txq_set_inactive(trans, txq_id);
iwl_trans_write_mem(trans, stts_addr, (void *)zero_val,
ARRAY_SIZE(zero_val));
}
iwl_pcie_txq_unmap(trans, txq_id);
trans_pcie->txq[txq_id].ampdu = false;
IWL_DEBUG_TX_QUEUES(trans, "Deactivate queue %d\n", txq_id);
}
/*************** HOST COMMAND QUEUE FUNCTIONS *****/
/*
* iwl_pcie_enqueue_hcmd - enqueue a uCode command
* @priv: device private data point
* @cmd: a pointer to the ucode command structure
*
* The function returns < 0 values to indicate the operation
* failed. On success, it returns the index (>= 0) of command in the
* command queue.
*/
static int iwl_pcie_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_txq *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;
unsigned long flags;
void *dup_buf = NULL;
dma_addr_t phys_addr;
int idx;
u16 copy_size, cmd_size, scratch_size;
bool had_nocopy = false;
u8 group_id = iwl_cmd_groupid(cmd->id);
int i, ret;
u32 cmd_pos;
const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
if (WARN(!trans_pcie->wide_cmd_header &&
group_id > IWL_ALWAYS_LONG_GROUP,
"unsupported wide command %#x\n", cmd->id))
return -EINVAL;
if (group_id != 0) {
copy_size = sizeof(struct iwl_cmd_header_wide);
cmd_size = sizeof(struct iwl_cmd_header_wide);
} else {
copy_size = sizeof(struct iwl_cmd_header);
cmd_size = sizeof(struct iwl_cmd_header);
}
/* need one for the header if the first is NOCOPY */
BUILD_BUG_ON(IWL_MAX_CMD_TBS_PER_TFD > IWL_NUM_OF_TBS - 1);
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
cmddata[i] = cmd->data[i];
cmdlen[i] = cmd->len[i];
if (!cmd->len[i])
continue;
/* need at least IWL_HCMD_SCRATCHBUF_SIZE copied */
if (copy_size < IWL_HCMD_SCRATCHBUF_SIZE) {
int copy = IWL_HCMD_SCRATCHBUF_SIZE - copy_size;
if (copy > cmdlen[i])
copy = cmdlen[i];
cmdlen[i] -= copy;
cmddata[i] += copy;
copy_size += copy;
}
if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) {
had_nocopy = true;
if (WARN_ON(cmd->dataflags[i] & IWL_HCMD_DFL_DUP)) {
idx = -EINVAL;
goto free_dup_buf;
}
} else if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP) {
/*
* This is also a chunk that isn't copied
* to the static buffer so set had_nocopy.
*/
had_nocopy = true;
/* only allowed once */
if (WARN_ON(dup_buf)) {
idx = -EINVAL;
goto free_dup_buf;
}
dup_buf = kmemdup(cmddata[i], cmdlen[i],
GFP_ATOMIC);
if (!dup_buf)
return -ENOMEM;
} else {
/* NOCOPY must not be followed by normal! */
if (WARN_ON(had_nocopy)) {
idx = -EINVAL;
goto free_dup_buf;
}
copy_size += cmdlen[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(copy_size > TFD_MAX_PAYLOAD_SIZE,
"Command %s (%#x) is too large (%d bytes)\n",
get_cmd_string(trans_pcie, cmd->id), cmd->id, copy_size)) {
idx = -EINVAL;
goto free_dup_buf;
}
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);
idx = -ENOSPC;
goto free_dup_buf;
}
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 */
if (group_id != 0) {
out_cmd->hdr_wide.cmd = iwl_cmd_opcode(cmd->id);
out_cmd->hdr_wide.group_id = group_id;
out_cmd->hdr_wide.version = iwl_cmd_version(cmd->id);
out_cmd->hdr_wide.length =
cpu_to_le16(cmd_size -
sizeof(struct iwl_cmd_header_wide));
out_cmd->hdr_wide.reserved = 0;
out_cmd->hdr_wide.sequence =
cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
INDEX_TO_SEQ(q->write_ptr));
cmd_pos = sizeof(struct iwl_cmd_header_wide);
copy_size = sizeof(struct iwl_cmd_header_wide);
} else {
out_cmd->hdr.cmd = iwl_cmd_opcode(cmd->id);
out_cmd->hdr.sequence =
cpu_to_le16(QUEUE_TO_SEQ(trans_pcie->cmd_queue) |
INDEX_TO_SEQ(q->write_ptr));
out_cmd->hdr.group_id = 0;
cmd_pos = sizeof(struct iwl_cmd_header);
copy_size = sizeof(struct iwl_cmd_header);
}
/* and copy the data that needs to be copied */
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
int copy;
if (!cmd->len[i])
continue;
/* copy everything if not nocopy/dup */
if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
IWL_HCMD_DFL_DUP))) {
copy = cmd->len[i];
memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
cmd_pos += copy;
copy_size += copy;
continue;
}
/*
* Otherwise we need at least IWL_HCMD_SCRATCHBUF_SIZE copied
* in total (for the scratchbuf handling), but copy up to what
* we can fit into the payload for debug dump purposes.
*/
copy = min_t(int, TFD_MAX_PAYLOAD_SIZE - cmd_pos, cmd->len[i]);
memcpy((u8 *)out_cmd + cmd_pos, cmd->data[i], copy);
cmd_pos += copy;
/* However, treat copy_size the proper way, we need it below */
if (copy_size < IWL_HCMD_SCRATCHBUF_SIZE) {
copy = IWL_HCMD_SCRATCHBUF_SIZE - copy_size;
if (copy > cmd->len[i])
copy = cmd->len[i];
copy_size += copy;
}
}
IWL_DEBUG_HC(trans,
"Sending command %s (%.2x.%.2x), seq: 0x%04X, %d bytes at %d[%d]:%d\n",
get_cmd_string(trans_pcie, out_cmd->hdr.cmd),
group_id, out_cmd->hdr.cmd,
le16_to_cpu(out_cmd->hdr.sequence),
cmd_size, q->write_ptr, idx, trans_pcie->cmd_queue);
/* start the TFD with the scratchbuf */
scratch_size = min_t(int, copy_size, IWL_HCMD_SCRATCHBUF_SIZE);
memcpy(&txq->scratchbufs[q->write_ptr], &out_cmd->hdr, scratch_size);
iwl_pcie_txq_build_tfd(trans, txq,
iwl_pcie_get_scratchbuf_dma(txq, q->write_ptr),
scratch_size, true);
/* map first command fragment, if any remains */
if (copy_size > scratch_size) {
phys_addr = dma_map_single(trans->dev,
((u8 *)&out_cmd->hdr) + scratch_size,
copy_size - scratch_size,
DMA_TO_DEVICE);
if (dma_mapping_error(trans->dev, phys_addr)) {
iwl_pcie_tfd_unmap(trans, out_meta,
&txq->tfds[q->write_ptr]);
idx = -ENOMEM;
goto out;
}
iwl_pcie_txq_build_tfd(trans, txq, phys_addr,
copy_size - scratch_size, false);
}
/* map the remaining (adjusted) nocopy/dup fragments */
for (i = 0; i < IWL_MAX_CMD_TBS_PER_TFD; i++) {
const void *data = cmddata[i];
if (!cmdlen[i])
continue;
if (!(cmd->dataflags[i] & (IWL_HCMD_DFL_NOCOPY |
IWL_HCMD_DFL_DUP)))
continue;
if (cmd->dataflags[i] & IWL_HCMD_DFL_DUP)
data = dup_buf;
phys_addr = dma_map_single(trans->dev, (void *)data,
cmdlen[i], DMA_TO_DEVICE);
if (dma_mapping_error(trans->dev, phys_addr)) {
iwl_pcie_tfd_unmap(trans, out_meta,
&txq->tfds[q->write_ptr]);
idx = -ENOMEM;
goto out;
}
iwl_pcie_txq_build_tfd(trans, txq, phys_addr, cmdlen[i], false);
}
BUILD_BUG_ON(IWL_NUM_OF_TBS + CMD_TB_BITMAP_POS >
sizeof(out_meta->flags) * BITS_PER_BYTE);
out_meta->flags = cmd->flags;
if (WARN_ON_ONCE(txq->entries[idx].free_buf))
kzfree(txq->entries[idx].free_buf);
txq->entries[idx].free_buf = dup_buf;
trace_iwlwifi_dev_hcmd(trans->dev, cmd, cmd_size, &out_cmd->hdr_wide);
/* start timer if queue currently empty */
if (q->read_ptr == q->write_ptr && txq->wd_timeout)
mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
spin_lock_irqsave(&trans_pcie->reg_lock, flags);
ret = iwl_pcie_set_cmd_in_flight(trans, cmd);
if (ret < 0) {
idx = ret;
spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
goto out;
}
/* Increment and update queue's write index */
q->write_ptr = iwl_queue_inc_wrap(q->write_ptr);
iwl_pcie_txq_inc_wr_ptr(trans, txq);
spin_unlock_irqrestore(&trans_pcie->reg_lock, flags);
out:
spin_unlock_bh(&txq->lock);
free_dup_buf:
if (idx < 0)
kfree(dup_buf);
return idx;
}
/*
* iwl_pcie_hcmd_complete - Pull unused buffers off the queue and reclaim them
* @rxb: Rx buffer to reclaim
*
* 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_pcie_hcmd_complete(struct iwl_trans *trans,
struct iwl_rx_cmd_buffer *rxb)
{
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_txq *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_bh(&txq->lock);
cmd_index = get_cmd_index(&txq->q, index);
cmd = txq->entries[cmd_index].cmd;
meta = &txq->entries[cmd_index].meta;
iwl_pcie_tfd_unmap(trans, meta, &txq->tfds[index]);
/* 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;
}
iwl_pcie_cmdq_reclaim(trans, txq_id, index);
if (!(meta->flags & CMD_ASYNC)) {
if (!test_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status)) {
IWL_WARN(trans,
"HCMD_ACTIVE already clear for command %s\n",
get_cmd_string(trans_pcie, cmd->hdr.cmd));
}
clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
get_cmd_string(trans_pcie, cmd->hdr.cmd));
wake_up(&trans_pcie->wait_command_queue);
}
meta->flags = 0;
spin_unlock_bh(&txq->lock);
}
#define HOST_COMPLETE_TIMEOUT (2 * HZ)
static int iwl_pcie_send_hcmd_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_pcie_enqueue_hcmd(trans, cmd);
if (ret < 0) {
IWL_ERR(trans,
"Error sending %s: enqueue_hcmd failed: %d\n",
get_cmd_string(trans_pcie, cmd->id), ret);
return ret;
}
return 0;
}
static int iwl_pcie_send_hcmd_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",
get_cmd_string(trans_pcie, cmd->id));
if (WARN(test_and_set_bit(STATUS_SYNC_HCMD_ACTIVE,
&trans->status),
"Command %s: a command is already active!\n",
get_cmd_string(trans_pcie, cmd->id)))
return -EIO;
IWL_DEBUG_INFO(trans, "Setting HCMD_ACTIVE for command %s\n",
get_cmd_string(trans_pcie, cmd->id));
cmd_idx = iwl_pcie_enqueue_hcmd(trans, cmd);
if (cmd_idx < 0) {
ret = cmd_idx;
clear_bit(STATUS_SYNC_HCMD_ACTIVE, &trans->status);
IWL_ERR(trans,
"Error sending %s: enqueue_hcmd failed: %d\n",
get_cmd_string(trans_pcie, cmd->id), ret);
return ret;
}
ret = wait_event_timeout(trans_pcie->wait_command_queue,
!test_bit(STATUS_SYNC_HCMD_ACTIVE,
&trans->status),
HOST_COMPLETE_TIMEOUT);
if (!ret) {
struct iwl_txq *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",
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_SYNC_HCMD_ACTIVE, &trans->status);
IWL_DEBUG_INFO(trans, "Clearing HCMD_ACTIVE for command %s\n",
get_cmd_string(trans_pcie, cmd->id));
ret = -ETIMEDOUT;
iwl_force_nmi(trans);
iwl_trans_fw_error(trans);
goto cancel;
}
if (test_bit(STATUS_FW_ERROR, &trans->status)) {
IWL_ERR(trans, "FW error in SYNC CMD %s\n",
get_cmd_string(trans_pcie, cmd->id));
dump_stack();
ret = -EIO;
goto cancel;
}
if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
test_bit(STATUS_RFKILL, &trans->status)) {
IWL_DEBUG_RF_KILL(trans, "RFKILL in SYNC CMD... no rsp\n");
ret = -ERFKILL;
goto cancel;
}
if ((cmd->flags & CMD_WANT_SKB) && !cmd->resp_pkt) {
IWL_ERR(trans, "Error: Response NULL in '%s'\n",
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_hcmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
{
if (!(cmd->flags & CMD_SEND_IN_RFKILL) &&
test_bit(STATUS_RFKILL, &trans->status)) {
IWL_DEBUG_RF_KILL(trans, "Dropping CMD 0x%x: RF KILL\n",
cmd->id);
return -ERFKILL;
}
if (cmd->flags & CMD_ASYNC)
return iwl_pcie_send_hcmd_async(trans, cmd);
/* We still can fail on RFKILL that can be asserted while we wait */
return iwl_pcie_send_hcmd_sync(trans, cmd);
}
int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
struct iwl_device_cmd *dev_cmd, int txq_id)
{
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
struct ieee80211_hdr *hdr;
struct iwl_tx_cmd *tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
struct iwl_cmd_meta *out_meta;
struct iwl_txq *txq;
struct iwl_queue *q;
dma_addr_t tb0_phys, tb1_phys, scratch_phys;
void *tb1_addr;
u16 len, tb1_len, tb2_len;
bool wait_write_ptr;
__le16 fc;
u8 hdr_len;
u16 wifi_seq;
int i;
txq = &trans_pcie->txq[txq_id];
q = &txq->q;
if (WARN_ONCE(!test_bit(txq_id, trans_pcie->queue_used),
"TX on unused queue %d\n", txq_id))
return -EINVAL;
if (skb_is_nonlinear(skb) &&
skb_shinfo(skb)->nr_frags > IWL_PCIE_MAX_FRAGS &&
__skb_linearize(skb))
return -ENOMEM;
/* mac80211 always puts the full header into the SKB's head,
* so there's no need to check if it's readable there
*/
hdr = (struct ieee80211_hdr *)skb->data;
fc = hdr->frame_control;
hdr_len = ieee80211_hdrlen(fc);
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.
* Check here that the packets are in the right place on the ring.
*/
wifi_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
WARN_ONCE(txq->ampdu &&
(wifi_seq & 0xff) != q->write_ptr,
"Q: %d WiFi Seq %d tfdNum %d",
txq_id, wifi_seq, q->write_ptr);
/* Set up driver data for this TFD */
txq->entries[q->write_ptr].skb = skb;
txq->entries[q->write_ptr].cmd = dev_cmd;
dev_cmd->hdr.sequence =
cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
INDEX_TO_SEQ(q->write_ptr)));
tb0_phys = iwl_pcie_get_scratchbuf_dma(txq, q->write_ptr);
scratch_phys = tb0_phys + sizeof(struct iwl_cmd_header) +
offsetof(struct iwl_tx_cmd, scratch);
tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
tx_cmd->dram_msb_ptr = iwl_get_dma_hi_addr(scratch_phys);
/* Set up first empty entry in queue's array of Tx/cmd buffers */
out_meta = &txq->entries[q->write_ptr].meta;
out_meta->flags = 0;
/*
* The second TB (tb1) points to the remainder of the TX command
* and the 802.11 header - dword aligned size
* (This calculation modifies the TX command, so do it before the
* setup of the first TB)
*/
len = sizeof(struct iwl_tx_cmd) + sizeof(struct iwl_cmd_header) +
hdr_len - IWL_HCMD_SCRATCHBUF_SIZE;
tb1_len = ALIGN(len, 4);
/* Tell NIC about any 2-byte padding after MAC header */
if (tb1_len != len)
tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
/* The first TB points to the scratchbuf data - min_copy bytes */
memcpy(&txq->scratchbufs[q->write_ptr], &dev_cmd->hdr,
IWL_HCMD_SCRATCHBUF_SIZE);
iwl_pcie_txq_build_tfd(trans, txq, tb0_phys,
IWL_HCMD_SCRATCHBUF_SIZE, true);
/* there must be data left over for TB1 or this code must be changed */
BUILD_BUG_ON(sizeof(struct iwl_tx_cmd) < IWL_HCMD_SCRATCHBUF_SIZE);
/* map the data for TB1 */
tb1_addr = ((u8 *)&dev_cmd->hdr) + IWL_HCMD_SCRATCHBUF_SIZE;
tb1_phys = dma_map_single(trans->dev, tb1_addr, tb1_len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, tb1_phys)))
goto out_err;
iwl_pcie_txq_build_tfd(trans, txq, tb1_phys, tb1_len, false);
/*
* Set up TFD's third entry to point directly to remainder
* of skb's head, if any
*/
tb2_len = skb_headlen(skb) - hdr_len;
if (tb2_len > 0) {
dma_addr_t tb2_phys = dma_map_single(trans->dev,
skb->data + hdr_len,
tb2_len, DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, tb2_phys))) {
iwl_pcie_tfd_unmap(trans, out_meta,
&txq->tfds[q->write_ptr]);
goto out_err;
}
iwl_pcie_txq_build_tfd(trans, txq, tb2_phys, tb2_len, false);
}
/* set up the remaining entries to point to the data */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
dma_addr_t tb_phys;
int tb_idx;
if (!skb_frag_size(frag))
continue;
tb_phys = skb_frag_dma_map(trans->dev, frag, 0,
skb_frag_size(frag), DMA_TO_DEVICE);
if (unlikely(dma_mapping_error(trans->dev, tb_phys))) {
iwl_pcie_tfd_unmap(trans, out_meta,
&txq->tfds[q->write_ptr]);
goto out_err;
}
tb_idx = iwl_pcie_txq_build_tfd(trans, txq, tb_phys,
skb_frag_size(frag), false);
out_meta->flags |= BIT(tb_idx + CMD_TB_BITMAP_POS);
}
/* Set up entry for this TFD in Tx byte-count array */
iwl_pcie_txq_update_byte_cnt_tbl(trans, txq, le16_to_cpu(tx_cmd->len));
trace_iwlwifi_dev_tx(trans->dev, skb,
&txq->tfds[txq->q.write_ptr],
sizeof(struct iwl_tfd),
&dev_cmd->hdr, IWL_HCMD_SCRATCHBUF_SIZE + tb1_len,
skb->data + hdr_len, tb2_len);
trace_iwlwifi_dev_tx_data(trans->dev, skb,
hdr_len, skb->len - hdr_len);
wait_write_ptr = ieee80211_has_morefrags(fc);
/* start timer if queue currently empty */
if (q->read_ptr == q->write_ptr) {
if (txq->wd_timeout) {
/*
* If the TXQ is active, then set the timer, if not,
* set the timer in remainder so that the timer will
* be armed with the right value when the station will
* wake up.
*/
if (!txq->frozen)
mod_timer(&txq->stuck_timer,
jiffies + txq->wd_timeout);
else
txq->frozen_expiry_remainder = txq->wd_timeout;
}
IWL_DEBUG_RPM(trans, "Q: %d first tx - take ref\n", q->id);
iwl_trans_pcie_ref(trans);
}
/* Tell device the write index *just past* this latest filled TFD */
q->write_ptr = iwl_queue_inc_wrap(q->write_ptr);
if (!wait_write_ptr)
iwl_pcie_txq_inc_wr_ptr(trans, txq);
/*
* At this point the frame is "transmitted" successfully
* and we will get a TX status notification eventually.
*/
if (iwl_queue_space(q) < q->high_mark) {
if (wait_write_ptr)
iwl_pcie_txq_inc_wr_ptr(trans, txq);
else
iwl_stop_queue(trans, txq);
}
spin_unlock(&txq->lock);
return 0;
out_err:
spin_unlock(&txq->lock);
return -1;
}