Ejemplo n.º 1
0
int iwl_trans_pcie_gen2_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 iwl_cmd_meta *out_meta;
	struct iwl_txq *txq = trans_pcie->txq[txq_id];
	u16 cmd_len;
	int idx;
	void *tfd;

	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(trans_pcie) &&
	    __skb_linearize(skb))
		return -ENOMEM;

	spin_lock(&txq->lock);

	if (iwl_queue_space(trans, txq) < txq->high_mark) {
		iwl_stop_queue(trans, txq);

		/* don't put the packet on the ring, if there is no room */
		if (unlikely(iwl_queue_space(trans, txq) < 3)) {
			struct iwl_device_cmd **dev_cmd_ptr;

			dev_cmd_ptr = (void *)((u8 *)skb->cb +
					       trans_pcie->dev_cmd_offs);

			*dev_cmd_ptr = dev_cmd;
			__skb_queue_tail(&txq->overflow_q, skb);
			spin_unlock(&txq->lock);
			return 0;
		}
	}

	idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);

	/* Set up driver data for this TFD */
	txq->entries[idx].skb = skb;
	txq->entries[idx].cmd = dev_cmd;

	dev_cmd->hdr.sequence =
		cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
			    INDEX_TO_SEQ(idx)));

	/* Set up first empty entry in queue's array of Tx/cmd buffers */
	out_meta = &txq->entries[idx].meta;
	out_meta->flags = 0;

	tfd = iwl_pcie_gen2_build_tfd(trans, txq, dev_cmd, skb, out_meta);
	if (!tfd) {
		spin_unlock(&txq->lock);
		return -1;
	}

	if (trans->cfg->device_family >= IWL_DEVICE_FAMILY_22560) {
		struct iwl_tx_cmd_gen3 *tx_cmd_gen3 =
			(void *)dev_cmd->payload;

		cmd_len = le16_to_cpu(tx_cmd_gen3->len);
	} else {
		struct iwl_tx_cmd_gen2 *tx_cmd_gen2 =
			(void *)dev_cmd->payload;

		cmd_len = le16_to_cpu(tx_cmd_gen2->len);
	}

	/* Set up entry for this TFD in Tx byte-count array */
	iwl_pcie_gen2_update_byte_tbl(trans_pcie, txq, cmd_len,
				      iwl_pcie_gen2_get_num_tbs(trans, tfd));

	/* start timer if queue currently empty */
	if (txq->read_ptr == txq->write_ptr) {
		if (txq->wd_timeout)
			mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);
		IWL_DEBUG_RPM(trans, "Q: %d first tx - take ref\n", txq->id);
		iwl_trans_ref(trans);
	}

	/* Tell device the write index *just past* this latest filled TFD */
	txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr);
	iwl_pcie_gen2_txq_inc_wr_ptr(trans, txq);
	/*
	 * At this point the frame is "transmitted" successfully
	 * and we will get a TX status notification eventually.
	 */
	spin_unlock(&txq->lock);
	return 0;
}
Ejemplo n.º 2
0
/*
 * iwl_pcie_gen2_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_gen2_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_device_cmd *out_cmd;
	struct iwl_cmd_meta *out_meta;
	unsigned long flags;
	void *dup_buf = NULL;
	dma_addr_t phys_addr;
	int i, cmd_pos, idx;
	u16 copy_size, cmd_size, tb0_size;
	bool had_nocopy = false;
	u8 group_id = iwl_cmd_groupid(cmd->id);
	const u8 *cmddata[IWL_MAX_CMD_TBS_PER_TFD];
	u16 cmdlen[IWL_MAX_CMD_TBS_PER_TFD];
	struct iwl_tfh_tfd *tfd;

	copy_size = sizeof(struct iwl_cmd_header_wide);
	cmd_size = sizeof(struct iwl_cmd_header_wide);

	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_FIRST_TB_SIZE copied */
		if (copy_size < IWL_FIRST_TB_SIZE) {
			int copy = IWL_FIRST_TB_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",
		 iwl_get_cmd_string(trans, cmd->id), cmd->id, copy_size)) {
		idx = -EINVAL;
		goto free_dup_buf;
	}

	spin_lock_bh(&txq->lock);

	idx = iwl_pcie_get_cmd_index(txq, txq->write_ptr);
	tfd = iwl_pcie_get_tfd(trans, txq, txq->write_ptr);
	memset(tfd, 0, sizeof(*tfd));

	if (iwl_queue_space(trans, txq) < ((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;
	}

	out_cmd = txq->entries[idx].cmd;
	out_meta = &txq->entries[idx].meta;

	/* re-initialize to NULL */
	memset(out_meta, 0, sizeof(*out_meta));
	if (cmd->flags & CMD_WANT_SKB)
		out_meta->source = cmd;

	/* set up the header */
	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(txq->write_ptr));

	cmd_pos = sizeof(struct iwl_cmd_header_wide);
	copy_size = sizeof(struct iwl_cmd_header_wide);

	/* 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_FIRST_TB_SIZE copied
		 * in total (for bi-directional DMA), 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_FIRST_TB_SIZE) {
			copy = IWL_FIRST_TB_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",
		     iwl_get_cmd_string(trans, cmd->id), group_id,
		     out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
		     cmd_size, txq->write_ptr, idx, trans_pcie->cmd_queue);

	/* start the TFD with the minimum copy bytes */
	tb0_size = min_t(int, copy_size, IWL_FIRST_TB_SIZE);
	memcpy(&txq->first_tb_bufs[idx], &out_cmd->hdr, tb0_size);
	iwl_pcie_gen2_set_tb(trans, tfd, iwl_pcie_get_first_tb_dma(txq, idx),
			     tb0_size);

	/* map first command fragment, if any remains */
	if (copy_size > tb0_size) {
		phys_addr = dma_map_single(trans->dev,
					   ((u8 *)&out_cmd->hdr) + tb0_size,
					   copy_size - tb0_size,
					   DMA_TO_DEVICE);
		if (dma_mapping_error(trans->dev, phys_addr)) {
			idx = -ENOMEM;
			iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
			goto out;
		}
		iwl_pcie_gen2_set_tb(trans, tfd, phys_addr,
				     copy_size - tb0_size);
	}

	/* 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)) {
			idx = -ENOMEM;
			iwl_pcie_gen2_tfd_unmap(trans, out_meta, tfd);
			goto out;
		}
		iwl_pcie_gen2_set_tb(trans, tfd, phys_addr, cmdlen[i]);
	}

	BUILD_BUG_ON(IWL_TFH_NUM_TBS > sizeof(out_meta->tbs) * 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 (txq->read_ptr == txq->write_ptr && txq->wd_timeout)
		mod_timer(&txq->stuck_timer, jiffies + txq->wd_timeout);

	spin_lock_irqsave(&trans_pcie->reg_lock, flags);
	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_ref(trans);
	}
	/* Increment and update queue's write index */
	txq->write_ptr = iwl_queue_inc_wrap(trans, txq->write_ptr);
	iwl_pcie_gen2_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;
}
Ejemplo n.º 3
0
/**
 * 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;
	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

	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_dest = out_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(cmd_dest, cmd->data[i], cmd->len[i]);
		cmd_dest += cmd->len[i];
	}

	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);
#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 = dma_map_single(trans->dev,
					   (void *)cmd->data[i],
					   cmd->len[i], DMA_BIDIRECTIONAL);
		if (dma_mapping_error(trans->dev, phys_addr)) {
			iwlagn_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);
#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;

	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(trans->dev, cmd->flags,
			       trace_bufs[0], trace_lens[0],
			       trace_bufs[1], trace_lens[1],
			       trace_bufs[2], trace_lens[2]);
#endif

	/* 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;
}