linux-stable/drivers/gpu/host1x/channel.h
Mikko Perttunen 8474b02531 gpu: host1x: Refactor channel allocation code
This is largely a rewrite of the Host1x channel allocation code, bringing
several changes:

- The previous code could deadlock due to an interaction
  between the 'reflock' mutex and CDMA timeout handling.
  This gets rid of the mutex.
- Support for more than 32 channels, required for Tegra186
- General refactoring, including better encapsulation
  of channel ownership handling into channel.c

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
2017-06-15 14:25:38 +02:00

51 lines
1.4 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/>.
*/
#ifndef __HOST1X_CHANNEL_H
#define __HOST1X_CHANNEL_H
#include <linux/io.h>
#include <linux/kref.h>
#include "cdma.h"
struct host1x;
struct host1x_channel;
struct host1x_channel_list {
struct host1x_channel *channels;
unsigned long *allocated_channels;
};
struct host1x_channel {
struct kref refcount;
unsigned int id;
struct mutex submitlock;
void __iomem *regs;
struct device *dev;
struct host1x_cdma cdma;
};
/* channel list operations */
int host1x_channel_list_init(struct host1x_channel_list *chlist,
unsigned int num_channels);
void host1x_channel_list_free(struct host1x_channel_list *chlist);
struct host1x_channel *host1x_channel_get_index(struct host1x *host,
unsigned int index);
#endif