forked from mirrors/linux
8474b02531
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>
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
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* Tegra host1x Channel
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*
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* Copyright (c) 2010-2013, NVIDIA Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* 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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __HOST1X_CHANNEL_H
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#define __HOST1X_CHANNEL_H
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#include <linux/io.h>
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#include <linux/kref.h>
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#include "cdma.h"
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struct host1x;
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struct host1x_channel;
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struct host1x_channel_list {
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struct host1x_channel *channels;
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unsigned long *allocated_channels;
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};
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struct host1x_channel {
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struct kref refcount;
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unsigned int id;
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struct mutex submitlock;
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void __iomem *regs;
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struct device *dev;
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struct host1x_cdma cdma;
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};
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/* channel list operations */
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int host1x_channel_list_init(struct host1x_channel_list *chlist,
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unsigned int num_channels);
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void host1x_channel_list_free(struct host1x_channel_list *chlist);
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struct host1x_channel *host1x_channel_get_index(struct host1x *host,
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unsigned int index);
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#endif
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