diff options
Diffstat (limited to 'drivers/net/wireless/iwlwifi/iwl-tx.c')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-tx.c | 834 |
1 files changed, 0 insertions, 834 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c deleted file mode 100644 index 686e176b5eb..00000000000 --- a/drivers/net/wireless/iwlwifi/iwl-tx.c +++ /dev/null @@ -1,834 +0,0 @@ -/****************************************************************************** - * - * Copyright(c) 2003 - 2011 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/sched.h> -#include <linux/slab.h> -#include <net/mac80211.h> -#include "iwl-eeprom.h" -#include "iwl-agn.h" -#include "iwl-dev.h" -#include "iwl-core.h" -#include "iwl-sta.h" -#include "iwl-io.h" -#include "iwl-helpers.h" - -/** - * iwl_txq_update_write_ptr - Send new write index to hardware - */ -void iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq) -{ - u32 reg = 0; - int txq_id = txq->q.id; - - if (txq->need_update == 0) - return; - - if (priv->cfg->base_params->shadow_reg_enable) { - /* shadow register enabled */ - iwl_write32(priv, HBUS_TARG_WRPTR, - txq->q.write_ptr | (txq_id << 8)); - } else { - /* if we're trying to save power */ - if (test_bit(STATUS_POWER_PMI, &priv->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(priv, CSR_UCODE_DRV_GP1); - - if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) { - IWL_DEBUG_INFO(priv, - "Tx queue %d requesting wakeup," - " GP1 = 0x%x\n", txq_id, reg); - iwl_set_bit(priv, CSR_GP_CNTRL, - CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ); - return; - } - - iwl_write_direct32(priv, 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(priv, 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 iwlagn_unmap_tfd(struct iwl_priv *priv, struct iwl_cmd_meta *meta, - struct iwl_tfd *tfd) -{ - struct pci_dev *dev = priv->pci_dev; - 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(priv, "Too many chunks: %i\n", num_tbs); - /* @todo issue fatal error, it is quite serious situation */ - return; - } - - /* Unmap tx_cmd */ - if (num_tbs) - pci_unmap_single(dev, - dma_unmap_addr(meta, mapping), - dma_unmap_len(meta, len), - PCI_DMA_BIDIRECTIONAL); - - /* Unmap chunks, if any. */ - for (i = 1; i < num_tbs; i++) - pci_unmap_single(dev, iwl_tfd_tb_get_addr(tfd, i), - iwl_tfd_tb_get_len(tfd, i), PCI_DMA_TODEVICE); -} - -/** - * iwlagn_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr] - * @priv - driver private data - * @txq - tx queue - * - * Does NOT advance any TFD circular buffer read/write indexes - * Does NOT free the TFD itself (which is within circular buffer) - */ -void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq) -{ - struct iwl_tfd *tfd_tmp = txq->tfds; - int index = txq->q.read_ptr; - - iwlagn_unmap_tfd(priv, &txq->meta[index], &tfd_tmp[index]); - - /* free SKB */ - if (txq->txb) { - struct sk_buff *skb; - - skb = txq->txb[txq->q.read_ptr].skb; - - /* can be called from irqs-disabled context */ - if (skb) { - dev_kfree_skb_any(skb); - txq->txb[txq->q.read_ptr].skb = NULL; - } - } -} - -int iwlagn_txq_attach_buf_to_tfd(struct iwl_priv *priv, - 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(priv, "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(priv, "Unaligned address = %llx\n", - (unsigned long long)addr); - - iwl_tfd_set_tb(tfd, num_tbs, addr, len); - - return 0; -} - -/* - * Tell nic where to find circular buffer of Tx Frame Descriptors for - * given Tx queue, and enable the DMA channel used for that queue. - * - * supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA - * channels supported in hardware. - */ -static int iwlagn_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq) -{ - int txq_id = txq->q.id; - - /* Circular buffer (TFD queue in DRAM) physical base address */ - iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id), - txq->q.dma_addr >> 8); - - return 0; -} - -/** - * iwl_tx_queue_unmap - Unmap any remaining DMA mappings and free skb's - */ -void iwl_tx_queue_unmap(struct iwl_priv *priv, int txq_id) -{ - struct iwl_tx_queue *txq = &priv->txq[txq_id]; - struct iwl_queue *q = &txq->q; - - if (q->n_bd == 0) - return; - - while (q->write_ptr != q->read_ptr) { - iwlagn_txq_free_tfd(priv, txq); - q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd); - } -} - -/** - * iwl_tx_queue_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. - */ -void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id) -{ - struct iwl_tx_queue *txq = &priv->txq[txq_id]; - struct device *dev = &priv->pci_dev->dev; - int i; - - iwl_tx_queue_unmap(priv, txq_id); - - /* De-alloc array of command/tx buffers */ - for (i = 0; i < TFD_TX_CMD_SLOTS; i++) - kfree(txq->cmd[i]); - - /* De-alloc circular buffer of TFDs */ - if (txq->q.n_bd) - dma_free_coherent(dev, priv->hw_params.tfd_size * - txq->q.n_bd, txq->tfds, txq->q.dma_addr); - - /* De-alloc array of per-TFD driver data */ - kfree(txq->txb); - txq->txb = NULL; - - /* deallocate arrays */ - kfree(txq->cmd); - kfree(txq->meta); - txq->cmd = NULL; - txq->meta = NULL; - - /* 0-fill queue descriptor structure */ - memset(txq, 0, sizeof(*txq)); -} - -/** - * iwl_cmd_queue_unmap - Unmap any remaining DMA mappings from command queue - */ -void iwl_cmd_queue_unmap(struct iwl_priv *priv) -{ - struct iwl_tx_queue *txq = &priv->txq[priv->cmd_queue]; - struct iwl_queue *q = &txq->q; - int i; - - if (q->n_bd == 0) - return; - - while (q->read_ptr != q->write_ptr) { - i = get_cmd_index(q, q->read_ptr); - - if (txq->meta[i].flags & CMD_MAPPED) { - pci_unmap_single(priv->pci_dev, - dma_unmap_addr(&txq->meta[i], mapping), - dma_unmap_len(&txq->meta[i], len), - PCI_DMA_BIDIRECTIONAL); - txq->meta[i].flags = 0; - } - - q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd); - } -} - -/** - * iwl_cmd_queue_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. - */ -void iwl_cmd_queue_free(struct iwl_priv *priv) -{ - struct iwl_tx_queue *txq = &priv->txq[priv->cmd_queue]; - struct device *dev = &priv->pci_dev->dev; - int i; - - iwl_cmd_queue_unmap(priv); - - /* De-alloc array of command/tx buffers */ - for (i = 0; i < TFD_CMD_SLOTS; i++) - kfree(txq->cmd[i]); - - /* De-alloc circular buffer of TFDs */ - if (txq->q.n_bd) - dma_free_coherent(dev, priv->hw_params.tfd_size * txq->q.n_bd, - txq->tfds, txq->q.dma_addr); - - /* deallocate arrays */ - kfree(txq->cmd); - kfree(txq->meta); - txq->cmd = NULL; - txq->meta = NULL; - - /* 0-fill queue descriptor structure */ - memset(txq, 0, sizeof(*txq)); -} - -/*************** 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 - */ -static int iwl_queue_init(struct iwl_priv *priv, 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; -} - -/** - * iwl_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue - */ -static int iwl_tx_queue_alloc(struct iwl_priv *priv, - struct iwl_tx_queue *txq, u32 id) -{ - struct device *dev = &priv->pci_dev->dev; - size_t tfd_sz = priv->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX; - - /* Driver private data, only for Tx (not command) queues, - * not shared with device. */ - if (id != priv->cmd_queue) { - txq->txb = kzalloc(sizeof(txq->txb[0]) * - TFD_QUEUE_SIZE_MAX, GFP_KERNEL); - if (!txq->txb) { - IWL_ERR(priv, "kmalloc for auxiliary BD " - "structures failed\n"); - goto error; - } - } else { - txq->txb = NULL; - } - - /* Circular buffer of transmit frame descriptors (TFDs), - * shared with device */ - txq->tfds = dma_alloc_coherent(dev, tfd_sz, &txq->q.dma_addr, - GFP_KERNEL); - if (!txq->tfds) { - IWL_ERR(priv, "pci_alloc_consistent(%zd) failed\n", tfd_sz); - goto error; - } - txq->q.id = id; - - return 0; - - error: - kfree(txq->txb); - txq->txb = NULL; - - return -ENOMEM; -} - -/** - * iwl_tx_queue_init - Allocate and initialize one tx/cmd queue - */ -int iwl_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq, - int slots_num, u32 txq_id) -{ - int i, len; - int ret; - - txq->meta = kzalloc(sizeof(struct iwl_cmd_meta) * slots_num, - GFP_KERNEL); - txq->cmd = kzalloc(sizeof(struct iwl_device_cmd *) * slots_num, - GFP_KERNEL); - - if (!txq->meta || !txq->cmd) - goto out_free_arrays; - - len = sizeof(struct iwl_device_cmd); - for (i = 0; i < slots_num; i++) { - txq->cmd[i] = kmalloc(len, GFP_KERNEL); - if (!txq->cmd[i]) - goto err; - } - - /* Alloc driver data array and TFD circular buffer */ - ret = iwl_tx_queue_alloc(priv, txq, txq_id); - if (ret) - goto err; - - txq->need_update = 0; - - /* - * For the default queues 0-3, set up the swq_id - * already -- all others need to get one later - * (if they need one at all). - */ - if (txq_id < 4) - iwl_set_swq_id(txq, txq_id, txq_id); - - /* 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(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id); - if (ret) - return ret; - - /* Tell device where to find queue */ - iwlagn_tx_queue_init(priv, txq); - - return 0; -err: - for (i = 0; i < slots_num; i++) - kfree(txq->cmd[i]); -out_free_arrays: - kfree(txq->meta); - kfree(txq->cmd); - - return -ENOMEM; -} - -void iwl_tx_queue_reset(struct iwl_priv *priv, struct iwl_tx_queue *txq, - int slots_num, u32 txq_id) -{ - int actual_slots = slots_num; - - if (txq_id == priv->cmd_queue) - actual_slots++; - - memset(txq->meta, 0, sizeof(struct iwl_cmd_meta) * actual_slots); - - txq->need_update = 0; - - /* Initialize queue's high/low-water marks, and head/tail indexes */ - iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id); - - /* Tell device where to find queue */ - iwlagn_tx_queue_init(priv, txq); -} - -/*************** 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. - */ -int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd) -{ - struct iwl_tx_queue *txq = &priv->txq[priv->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; - unsigned long flags; - u32 idx; - u16 copy_size, cmd_size; - bool is_ct_kill = false; - bool had_nocopy = false; - int i; - u8 *cmd_dest; -#ifdef CONFIG_IWLWIFI_DEVICE_TRACING - const void *trace_bufs[IWL_MAX_CMD_TFDS + 1] = {}; - int trace_lens[IWL_MAX_CMD_TFDS + 1] = {}; - int trace_idx; -#endif - - if (test_bit(STATUS_FW_ERROR, &priv->status)) { - IWL_WARN(priv, "fw recovery, no hcmd send\n"); - return -EIO; - } - - 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; - - if (iwl_is_rfkill(priv) || iwl_is_ctkill(priv)) { - IWL_WARN(priv, "Not sending command - %s KILL\n", - iwl_is_rfkill(priv) ? "RF" : "CT"); - return -EIO; - } - - spin_lock_irqsave(&priv->hcmd_lock, flags); - - if (iwl_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) { - spin_unlock_irqrestore(&priv->hcmd_lock, flags); - - IWL_ERR(priv, "No space in command queue\n"); - is_ct_kill = iwl_check_for_ct_kill(priv); - if (!is_ct_kill) { - IWL_ERR(priv, "Restarting adapter due to queue full\n"); - iwlagn_fw_error(priv, false); - } - return -ENOSPC; - } - - idx = get_cmd_index(q, q->write_ptr); - out_cmd = txq->cmd[idx]; - out_meta = &txq->meta[idx]; - - if (WARN_ON(out_meta->flags & CMD_MAPPED)) { - spin_unlock_irqrestore(&priv->hcmd_lock, flags); - return -ENOSPC; - } - - memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */ - if (cmd->flags & CMD_WANT_SKB) - out_meta->source = cmd; - if (cmd->flags & CMD_ASYNC) - out_meta->callback = cmd->callback; - - /* 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(priv->cmd_queue) | - INDEX_TO_SEQ(q->write_ptr)); - - /* and copy the data that needs to be copied */ - - cmd_dest = &out_cmd->cmd.payload[0]; - for (i = 0; i < IWL_MAX_CMD_TFDS; i++) { - if (!cmd->len[i]) - continue; - if (cmd->dataflags[i] & IWL_HCMD_DFL_NOCOPY) - break; - memcpy(cmd_dest, cmd->data[i], cmd->len[i]); - cmd_dest += cmd->len[i]; - } - - IWL_DEBUG_HC(priv, "Sending command %s (#%x), seq: 0x%04X, " - "%d bytes at %d[%d]:%d\n", - get_cmd_string(out_cmd->hdr.cmd), - out_cmd->hdr.cmd, - le16_to_cpu(out_cmd->hdr.sequence), cmd_size, - q->write_ptr, idx, priv->cmd_queue); - - phys_addr = pci_map_single(priv->pci_dev, &out_cmd->hdr, - copy_size, PCI_DMA_BIDIRECTIONAL); - if (unlikely(pci_dma_mapping_error(priv->pci_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(priv, txq, phys_addr, copy_size, 1); -#ifdef CONFIG_IWLWIFI_DEVICE_TRACING - trace_bufs[0] = &out_cmd->hdr; - trace_lens[0] = copy_size; - trace_idx = 1; -#endif - - 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 = pci_map_single(priv->pci_dev, (void *)cmd->data[i], - cmd->len[i], PCI_DMA_TODEVICE); - if (pci_dma_mapping_error(priv->pci_dev, phys_addr)) { - iwlagn_unmap_tfd(priv, out_meta, - &txq->tfds[q->write_ptr]); - idx = -ENOMEM; - goto out; - } - - iwlagn_txq_attach_buf_to_tfd(priv, txq, phys_addr, - cmd->len[i], 0); -#ifdef CONFIG_IWLWIFI_DEVICE_TRACING - trace_bufs[trace_idx] = cmd->data[i]; - trace_lens[trace_idx] = cmd->len[i]; - trace_idx++; -#endif - } - - out_meta->flags = cmd->flags | CMD_MAPPED; - - txq->need_update = 1; - - /* check that tracing gets all possible blocks */ - BUILD_BUG_ON(IWL_MAX_CMD_TFDS + 1 != 3); -#ifdef CONFIG_IWLWIFI_DEVICE_TRACING - trace_iwlwifi_dev_hcmd(priv, cmd->flags, - trace_bufs[0], trace_lens[0], - trace_bufs[1], trace_lens[1], - trace_bufs[2], trace_lens[2]); -#endif - - /* 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(priv, txq); - - out: - spin_unlock_irqrestore(&priv->hcmd_lock, flags); - return idx; -} - -/** - * 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_priv *priv, int txq_id, int idx) -{ - struct iwl_tx_queue *txq = &priv->txq[txq_id]; - struct iwl_queue *q = &txq->q; - int nfreed = 0; - - if ((idx >= q->n_bd) || (iwl_queue_used(q, idx) == 0)) { - IWL_ERR(priv, "Read index for DMA queue txq id (%d), index %d, " - "is out of range [0-%d] %d %d.\n", 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(priv, "HCMD skipped: index (%d) %d %d\n", idx, - q->write_ptr, q->read_ptr); - iwlagn_fw_error(priv, false); - } - - } -} - -/** - * iwl_tx_cmd_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_tx_cmd_complete(struct iwl_priv *priv, struct iwl_rx_mem_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_tx_queue *txq = &priv->txq[priv->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 - * in the queue management code. */ - if (WARN(txq_id != priv->cmd_queue, - "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n", - txq_id, priv->cmd_queue, sequence, - priv->txq[priv->cmd_queue].q.read_ptr, - priv->txq[priv->cmd_queue].q.write_ptr)) { - iwl_print_hex_error(priv, pkt, 32); - return; - } - - cmd_index = get_cmd_index(&txq->q, index); - cmd = txq->cmd[cmd_index]; - meta = &txq->meta[cmd_index]; - - iwlagn_unmap_tfd(priv, meta, &txq->tfds[index]); - - /* Input error checking is done when commands are added to queue. */ - if (meta->flags & CMD_WANT_SKB) { - meta->source->reply_page = (unsigned long)rxb_addr(rxb); - rxb->page = NULL; - } else if (meta->callback) - meta->callback(priv, cmd, pkt); - - spin_lock_irqsave(&priv->hcmd_lock, flags); - - iwl_hcmd_queue_reclaim(priv, txq_id, index); - - if (!(meta->flags & CMD_ASYNC)) { - clear_bit(STATUS_HCMD_ACTIVE, &priv->status); - IWL_DEBUG_INFO(priv, "Clearing HCMD_ACTIVE for command %s\n", - get_cmd_string(cmd->hdr.cmd)); - wake_up_interruptible(&priv->wait_command_queue); - } - - /* Mark as unmapped */ - meta->flags = 0; - - spin_unlock_irqrestore(&priv->hcmd_lock, flags); -} |