Release 4.7 drivers/gpu/host1x/channel.c
/*
* Tegra host1x Channel
*
* Copyright (c) 2010-2013, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include "channel.h"
#include "dev.h"
#include "job.h"
/* Constructor for the host1x device list */
int host1x_channel_list_init(struct host1x *host)
{
INIT_LIST_HEAD(&host->chlist.list);
mutex_init(&host->chlist_mutex);
if (host->info->nb_channels > BITS_PER_LONG) {
WARN(1, "host1x hardware has more channels than supported by the driver\n");
return -ENOSYS;
}
return 0;
}
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int host1x_job_submit(struct host1x_job *job)
{
struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
return host1x_hw_channel_submit(host, job);
}
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EXPORT_SYMBOL(host1x_job_submit);
struct host1x_channel *host1x_channel_get(struct host1x_channel *channel)
{
int err = 0;
mutex_lock(&channel->reflock);
if (channel->refcount == 0)
err = host1x_cdma_init(&channel->cdma);
if (!err)
channel->refcount++;
mutex_unlock(&channel->reflock);
return err ? NULL : channel;
}
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EXPORT_SYMBOL(host1x_channel_get);
void host1x_channel_put(struct host1x_channel *channel)
{
mutex_lock(&channel->reflock);
if (channel->refcount == 1) {
struct host1x *host = dev_get_drvdata(channel->dev->parent);
host1x_hw_cdma_stop(host, &channel->cdma);
host1x_cdma_deinit(&channel->cdma);
}
channel->refcount--;
mutex_unlock(&channel->reflock);
}
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EXPORT_SYMBOL(host1x_channel_put);
struct host1x_channel *host1x_channel_request(struct device *dev)
{
struct host1x *host = dev_get_drvdata(dev->parent);
int max_channels = host->info->nb_channels;
struct host1x_channel *channel = NULL;
int index, err;
mutex_lock(&host->chlist_mutex);
index = find_first_zero_bit(&host->allocated_channels, max_channels);
if (index >= max_channels)
goto fail;
channel = kzalloc(sizeof(*channel), GFP_KERNEL);
if (!channel)
goto fail;
err = host1x_hw_channel_init(host, channel, index);
if (err < 0)
goto fail;
/* Link device to host1x_channel */
channel->dev = dev;
/* Add to channel list */
list_add_tail(&channel->list, &host->chlist.list);
host->allocated_channels |= BIT(index);
mutex_unlock(&host->chlist_mutex);
return channel;
fail:
dev_err(dev, "failed to init channel\n");
kfree(channel);
mutex_unlock(&host->chlist_mutex);
return NULL;
}
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EXPORT_SYMBOL(host1x_channel_request);
void host1x_channel_free(struct host1x_channel *channel)
{
struct host1x *host = dev_get_drvdata(channel->dev->parent);
host->allocated_channels &= ~BIT(channel->id);
list_del(&channel->list);
kfree(channel);
}
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EXPORT_SYMBOL(host1x_channel_free);
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