forked from Minki/linux
2bfb50924c
With new transports coming up, move to threaded interrupt handling now. This has the advantage that we can use the same locking scheme with all different transports we may need to implement. Note that the TX path obviously still runs in a tasklet, so some spin_lock() calls need to change to spin_lock_bh() calls to properly lock out the TX path. In my test on a Calpella platform this has no impact on throughput or latency. Also add lockdep annotations to avoid lockups due to catch sending synchronous commands or using locks that connect with them from the irq thread. Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
232 lines
8.1 KiB
C
232 lines
8.1 KiB
C
/******************************************************************************
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*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2007 - 2013 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
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* USA
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*
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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* BSD LICENSE
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*
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* Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*****************************************************************************/
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#ifndef __iwl_op_mode_h__
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#define __iwl_op_mode_h__
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#include <linux/debugfs.h>
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struct iwl_op_mode;
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struct iwl_trans;
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struct sk_buff;
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struct iwl_device_cmd;
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struct iwl_rx_cmd_buffer;
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struct iwl_fw;
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struct iwl_cfg;
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/**
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* DOC: Operational mode - what is it ?
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*
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* The operational mode (a.k.a. op_mode) is the layer that implements
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* mac80211's handlers. It knows two APIs: mac80211's and the fw's. It uses
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* the transport API to access the HW. The op_mode doesn't need to know how the
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* underlying HW works, since the transport layer takes care of that.
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*
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* There can be several op_mode: i.e. different fw APIs will require two
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* different op_modes. This is why the op_mode is virtualized.
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*/
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/**
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* DOC: Life cycle of the Operational mode
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*
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* The operational mode has a very simple life cycle.
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*
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* 1) The driver layer (iwl-drv.c) chooses the op_mode based on the
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* capabilities advertized by the fw file (in TLV format).
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* 2) The driver layer starts the op_mode (ops->start)
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* 3) The op_mode registers registers mac80211
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* 4) The op_mode is governed by mac80211
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* 5) The driver layer stops the op_mode
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*/
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/**
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* struct iwl_op_mode_ops - op_mode specific operations
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*
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* The op_mode exports its ops so that external components can start it and
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* interact with it. The driver layer typically calls the start and stop
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* handlers, the transport layer calls the others.
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*
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* All the handlers MUST be implemented
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*
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* @start: start the op_mode. The transport layer is already allocated.
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* May sleep
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* @stop: stop the op_mode. Must free all the memory allocated.
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* May sleep
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* @rx: Rx notification to the op_mode. rxb is the Rx buffer itself. Cmd is the
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* HCMD the this Rx responds to.
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* This callback may sleep, it is called from a threaded IRQ handler.
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* @queue_full: notifies that a HW queue is full.
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* Must be atomic and called with BH disabled.
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* @queue_not_full: notifies that a HW queue is not full any more.
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* Must be atomic and called with BH disabled.
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* @hw_rf_kill:notifies of a change in the HW rf kill switch. True means that
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* the radio is killed. May sleep.
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* @free_skb: allows the transport layer to free skbs that haven't been
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* reclaimed by the op_mode. This can happen when the driver is freed and
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* there are Tx packets pending in the transport layer.
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* Must be atomic
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* @nic_error: error notification. Must be atomic and must be called with BH
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* disabled.
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* @cmd_queue_full: Called when the command queue gets full. Must be atomic and
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* called with BH disabled.
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* @nic_config: configure NIC, called before firmware is started.
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* May sleep
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* @wimax_active: invoked when WiMax becomes active. May sleep
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*/
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struct iwl_op_mode_ops {
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struct iwl_op_mode *(*start)(struct iwl_trans *trans,
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const struct iwl_cfg *cfg,
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const struct iwl_fw *fw,
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struct dentry *dbgfs_dir);
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void (*stop)(struct iwl_op_mode *op_mode);
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int (*rx)(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
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struct iwl_device_cmd *cmd);
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void (*queue_full)(struct iwl_op_mode *op_mode, int queue);
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void (*queue_not_full)(struct iwl_op_mode *op_mode, int queue);
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void (*hw_rf_kill)(struct iwl_op_mode *op_mode, bool state);
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void (*free_skb)(struct iwl_op_mode *op_mode, struct sk_buff *skb);
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void (*nic_error)(struct iwl_op_mode *op_mode);
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void (*cmd_queue_full)(struct iwl_op_mode *op_mode);
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void (*nic_config)(struct iwl_op_mode *op_mode);
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void (*wimax_active)(struct iwl_op_mode *op_mode);
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};
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int iwl_opmode_register(const char *name, const struct iwl_op_mode_ops *ops);
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void iwl_opmode_deregister(const char *name);
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/**
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* struct iwl_op_mode - operational mode
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*
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* This holds an implementation of the mac80211 / fw API.
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*
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* @ops - pointer to its own ops
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*/
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struct iwl_op_mode {
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const struct iwl_op_mode_ops *ops;
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const struct iwl_trans *trans;
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char op_mode_specific[0] __aligned(sizeof(void *));
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};
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static inline void iwl_op_mode_stop(struct iwl_op_mode *op_mode)
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{
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might_sleep();
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op_mode->ops->stop(op_mode);
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}
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static inline int iwl_op_mode_rx(struct iwl_op_mode *op_mode,
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struct iwl_rx_cmd_buffer *rxb,
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struct iwl_device_cmd *cmd)
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{
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might_sleep();
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return op_mode->ops->rx(op_mode, rxb, cmd);
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}
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static inline void iwl_op_mode_queue_full(struct iwl_op_mode *op_mode,
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int queue)
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{
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op_mode->ops->queue_full(op_mode, queue);
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}
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static inline void iwl_op_mode_queue_not_full(struct iwl_op_mode *op_mode,
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int queue)
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{
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op_mode->ops->queue_not_full(op_mode, queue);
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}
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static inline void iwl_op_mode_hw_rf_kill(struct iwl_op_mode *op_mode,
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bool state)
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{
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might_sleep();
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op_mode->ops->hw_rf_kill(op_mode, state);
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}
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static inline void iwl_op_mode_free_skb(struct iwl_op_mode *op_mode,
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struct sk_buff *skb)
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{
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op_mode->ops->free_skb(op_mode, skb);
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}
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static inline void iwl_op_mode_nic_error(struct iwl_op_mode *op_mode)
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{
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op_mode->ops->nic_error(op_mode);
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}
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static inline void iwl_op_mode_cmd_queue_full(struct iwl_op_mode *op_mode)
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{
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op_mode->ops->cmd_queue_full(op_mode);
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}
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static inline void iwl_op_mode_nic_config(struct iwl_op_mode *op_mode)
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{
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might_sleep();
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op_mode->ops->nic_config(op_mode);
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}
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static inline void iwl_op_mode_wimax_active(struct iwl_op_mode *op_mode)
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{
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might_sleep();
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op_mode->ops->wimax_active(op_mode);
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}
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#endif /* __iwl_op_mode_h__ */
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