Commit 786d7257 authored by Maarten Lankhorst's avatar Maarten Lankhorst Committed by Dave Airlie
Browse files

reservation: cross-device reservation support, v4 



This adds support for a generic reservations framework that can be
hooked up to ttm and dma-buf and allows easy sharing of reservations
across devices.

The idea is that a dma-buf and ttm object both will get a pointer
to a struct reservation_object, which has to be reserved before
anything is done with the contents of the dma-buf.

Changes since v1:
 - Fix locking issue in ticket_reserve, which could cause mutex_unlock
   to be called too many times.
Changes since v2:
 - All fence related calls and members have been taken out for now,
   what's left is the bare minimum to be useful for ttm locking conversion.
Changes since v3:
 - Removed helper functions too. The documentation has an example
   implementation for locking. With the move to ww_mutex there is no
   need to have much logic any more.

Signed-off-by: default avatarMaarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: default avatarJerome Glisse <jglisse@redhat.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 8ade2b82

Documentation/DocBook/device-drivers.tmpl

+2 −0
Original line number Diff line number Diff line
@@ -126,6 +126,8 @@ X!Edrivers/base/interface.c 
     </sect1>

     <sect1><title>Device Drivers DMA Management</title>

!Edrivers/base/dma-buf.c

!Edrivers/base/reservation.c

!Iinclude/linux/reservation.h

!Edrivers/base/dma-coherent.c

!Edrivers/base/dma-mapping.c

     </sect1>

drivers/base/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -10,7 +10,7 @@ obj-$(CONFIG_CMA) += dma-contiguous.o 
obj-y			+= power/

obj-$(CONFIG_HAS_DMA)	+= dma-mapping.o

obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o

obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf.o

obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf.o reservation.o

obj-$(CONFIG_ISA)	+= isa.o

obj-$(CONFIG_FW_LOADER)	+= firmware_class.o

obj-$(CONFIG_NUMA)	+= node.o

drivers/base/reservation.c

0 → 100644
+39 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2012-2013 Canonical Ltd

 *

 * Based on bo.c which bears the following copyright notice,

 * but is dual licensed:

 *

 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL

 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,

 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

 * USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

/*

 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>

 */



#include <linux/reservation.h>

#include <linux/export.h>



DEFINE_WW_CLASS(reservation_ww_class);

EXPORT_SYMBOL(reservation_ww_class);

include/linux/reservation.h

0 → 100644
+62 −0
Original line number Diff line number Diff line 
/*

 * Header file for reservations for dma-buf and ttm

 *

 * Copyright(C) 2011 Linaro Limited. All rights reserved.

 * Copyright (C) 2012-2013 Canonical Ltd

 * Copyright (C) 2012 Texas Instruments

 *

 * Authors:

 * Rob Clark <rob.clark@linaro.org>

 * Maarten Lankhorst <maarten.lankhorst@canonical.com>

 * Thomas Hellstrom <thellstrom-at-vmware-dot-com>

 *

 * Based on bo.c which bears the following copyright notice,

 * but is dual licensed:

 *

 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL

 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,

 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

 * USE OR OTHER DEALINGS IN THE SOFTWARE.

 */

#ifndef _LINUX_RESERVATION_H

#define _LINUX_RESERVATION_H



#include <linux/mutex.h>



extern struct ww_class reservation_ww_class;



struct reservation_object {

	struct ww_mutex lock;

};



static inline void

reservation_object_init(struct reservation_object *obj)

{

	ww_mutex_init(&obj->lock, &reservation_ww_class);

}



static inline void

reservation_object_fini(struct reservation_object *obj)

{

	ww_mutex_destroy(&obj->lock);

}



#endif /* _LINUX_RESERVATION_H */

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