mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Mikko Perttunen](/assets/img/avatar_default.png)
This function actually doesn't sleep in the version that was merged. Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
166 lines
4.2 KiB
C
166 lines
4.2 KiB
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_channel_list *chlist,
|
|
unsigned int num_channels)
|
|
{
|
|
chlist->channels = kcalloc(num_channels, sizeof(struct host1x_channel),
|
|
GFP_KERNEL);
|
|
if (!chlist->channels)
|
|
return -ENOMEM;
|
|
|
|
chlist->allocated_channels =
|
|
kcalloc(BITS_TO_LONGS(num_channels), sizeof(unsigned long),
|
|
GFP_KERNEL);
|
|
if (!chlist->allocated_channels) {
|
|
kfree(chlist->channels);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
bitmap_zero(chlist->allocated_channels, num_channels);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void host1x_channel_list_free(struct host1x_channel_list *chlist)
|
|
{
|
|
kfree(chlist->allocated_channels);
|
|
kfree(chlist->channels);
|
|
}
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL(host1x_job_submit);
|
|
|
|
struct host1x_channel *host1x_channel_get(struct host1x_channel *channel)
|
|
{
|
|
kref_get(&channel->refcount);
|
|
|
|
return channel;
|
|
}
|
|
EXPORT_SYMBOL(host1x_channel_get);
|
|
|
|
/**
|
|
* host1x_channel_get_index() - Attempt to get channel reference by index
|
|
* @host: Host1x device object
|
|
* @index: Index of channel
|
|
*
|
|
* If channel number @index is currently allocated, increase its refcount
|
|
* and return a pointer to it. Otherwise, return NULL.
|
|
*/
|
|
struct host1x_channel *host1x_channel_get_index(struct host1x *host,
|
|
unsigned int index)
|
|
{
|
|
struct host1x_channel *ch = &host->channel_list.channels[index];
|
|
|
|
if (!kref_get_unless_zero(&ch->refcount))
|
|
return NULL;
|
|
|
|
return ch;
|
|
}
|
|
|
|
static void release_channel(struct kref *kref)
|
|
{
|
|
struct host1x_channel *channel =
|
|
container_of(kref, struct host1x_channel, refcount);
|
|
struct host1x *host = dev_get_drvdata(channel->dev->parent);
|
|
struct host1x_channel_list *chlist = &host->channel_list;
|
|
|
|
host1x_hw_cdma_stop(host, &channel->cdma);
|
|
host1x_cdma_deinit(&channel->cdma);
|
|
|
|
clear_bit(channel->id, chlist->allocated_channels);
|
|
}
|
|
|
|
void host1x_channel_put(struct host1x_channel *channel)
|
|
{
|
|
kref_put(&channel->refcount, release_channel);
|
|
}
|
|
EXPORT_SYMBOL(host1x_channel_put);
|
|
|
|
static struct host1x_channel *acquire_unused_channel(struct host1x *host)
|
|
{
|
|
struct host1x_channel_list *chlist = &host->channel_list;
|
|
unsigned int max_channels = host->info->nb_channels;
|
|
unsigned int index;
|
|
|
|
index = find_first_zero_bit(chlist->allocated_channels, max_channels);
|
|
if (index >= max_channels) {
|
|
dev_err(host->dev, "failed to find free channel\n");
|
|
return NULL;
|
|
}
|
|
|
|
chlist->channels[index].id = index;
|
|
|
|
set_bit(index, chlist->allocated_channels);
|
|
|
|
return &chlist->channels[index];
|
|
}
|
|
|
|
/**
|
|
* host1x_channel_request() - Allocate a channel
|
|
* @device: Host1x unit this channel will be used to send commands to
|
|
*
|
|
* Allocates a new host1x channel for @device. May return NULL if CDMA
|
|
* initialization fails.
|
|
*/
|
|
struct host1x_channel *host1x_channel_request(struct device *dev)
|
|
{
|
|
struct host1x *host = dev_get_drvdata(dev->parent);
|
|
struct host1x_channel_list *chlist = &host->channel_list;
|
|
struct host1x_channel *channel;
|
|
int err;
|
|
|
|
channel = acquire_unused_channel(host);
|
|
if (!channel)
|
|
return NULL;
|
|
|
|
kref_init(&channel->refcount);
|
|
mutex_init(&channel->submitlock);
|
|
channel->dev = dev;
|
|
|
|
err = host1x_hw_channel_init(host, channel, channel->id);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
err = host1x_cdma_init(&channel->cdma);
|
|
if (err < 0)
|
|
goto fail;
|
|
|
|
return channel;
|
|
|
|
fail:
|
|
clear_bit(channel->id, chlist->allocated_channels);
|
|
|
|
dev_err(dev, "failed to initialize channel\n");
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(host1x_channel_request);
|