iwl-trans.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2015 Intel Mobile Communications GmbH
 *
 * 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 COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2015 Intel Mobile Communications GmbH
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
#include <linux/kernel.h>
#include <linux/bsearch.h>

#include "iwl-trans.h"
#include "iwl-drv.h"
#include "iwl-fh.h"

struct iwl_trans *iwl_trans_alloc(unsigned int priv_size,
				  struct device *dev,
				  const struct iwl_cfg *cfg,
				  const struct iwl_trans_ops *ops,
				  size_t dev_cmd_headroom)
{
	struct iwl_trans *trans;
#ifdef CONFIG_LOCKDEP
	static struct lock_class_key __key;
#endif

	trans = kzalloc(sizeof(*trans) + priv_size, GFP_KERNEL);
	if (!trans)
		return NULL;

#ifdef CONFIG_LOCKDEP
	lockdep_init_map(&trans->sync_cmd_lockdep_map, "sync_cmd_lockdep_map",
			 &__key, 0);
#endif

	trans->dev = dev;
	trans->cfg = cfg;
	trans->ops = ops;
	trans->dev_cmd_headroom = dev_cmd_headroom;
	trans->num_rx_queues = 1;

	snprintf(trans->dev_cmd_pool_name, sizeof(trans->dev_cmd_pool_name),
		 "iwl_cmd_pool:%s", dev_name(trans->dev));
	trans->dev_cmd_pool =
		kmem_cache_create(trans->dev_cmd_pool_name,
				  sizeof(struct iwl_device_cmd)
				  + trans->dev_cmd_headroom,
				  sizeof(void *),
				  SLAB_HWCACHE_ALIGN,
				  NULL);
	if (!trans->dev_cmd_pool)
		goto free;

	return trans;
 free:
	kfree(trans);
	return NULL;
}

void iwl_trans_free(struct iwl_trans *trans)
{
	kmem_cache_destroy(trans->dev_cmd_pool);
	kfree(trans);
}

int iwl_trans_send_cmd(struct iwl_trans *trans, struct iwl_host_cmd *cmd)
{
	int ret;

	if (unlikely(!(cmd->flags & CMD_SEND_IN_RFKILL) &&
		     test_bit(STATUS_RFKILL, &trans->status)))
		return -ERFKILL;

	if (unlikely(test_bit(STATUS_FW_ERROR, &trans->status)))
		return -EIO;

	if (unlikely(trans->state != IWL_TRANS_FW_ALIVE)) {
		IWL_ERR(trans, "%s bad state = %d\n", __func__, trans->state);
		return -EIO;
	}

	if (WARN_ON((cmd->flags & CMD_WANT_ASYNC_CALLBACK) &&
		    !(cmd->flags & CMD_ASYNC)))
		return -EINVAL;

	if (!(cmd->flags & CMD_ASYNC))
		lock_map_acquire_read(&trans->sync_cmd_lockdep_map);

	if (trans->wide_cmd_header && !iwl_cmd_groupid(cmd->id))
		cmd->id = DEF_ID(cmd->id);

	ret = trans->ops->send_cmd(trans, cmd);

	if (!(cmd->flags & CMD_ASYNC))
		lock_map_release(&trans->sync_cmd_lockdep_map);

	return ret;
}
IWL_EXPORT_SYMBOL(iwl_trans_send_cmd);

/* Comparator for struct iwl_hcmd_names.
 * Used in the binary search over a list of host commands.
 *
 * @key: command_id that we're looking for.
 * @elt: struct iwl_hcmd_names candidate for match.
 *
 * @return 0 iff equal.
 */
static int iwl_hcmd_names_cmp(const void *key, const void *elt)
{
	const struct iwl_hcmd_names *name = elt;
	u8 cmd1 = *(u8 *)key;
	u8 cmd2 = name->cmd_id;

	return (cmd1 - cmd2);
}

const char *iwl_get_cmd_string(struct iwl_trans *trans, u32 id)
{
	u8 grp, cmd;
	struct iwl_hcmd_names *ret;
	const struct iwl_hcmd_arr *arr;
	size_t size = sizeof(struct iwl_hcmd_names);

	grp = iwl_cmd_groupid(id);
	cmd = iwl_cmd_opcode(id);

	if (!trans->command_groups || grp >= trans->command_groups_size ||
	    !trans->command_groups[grp].arr)
		return "UNKNOWN";

	arr = &trans->command_groups[grp];
	ret = bsearch(&cmd, arr->arr, arr->size, size, iwl_hcmd_names_cmp);
	if (!ret)
		return "UNKNOWN";
	return ret->cmd_name;
}
IWL_EXPORT_SYMBOL(iwl_get_cmd_string);

int iwl_cmd_groups_verify_sorted(const struct iwl_trans_config *trans)
{
	int i, j;
	const struct iwl_hcmd_arr *arr;

	for (i = 0; i < trans->command_groups_size; i++) {
		arr = &trans->command_groups[i];
		if (!arr->arr)
			continue;
		for (j = 0; j < arr->size - 1; j++)
			if (arr->arr[j].cmd_id > arr->arr[j + 1].cmd_id)
				return -1;
	}
	return 0;
}
IWL_EXPORT_SYMBOL(iwl_cmd_groups_verify_sorted);