drm/ttm: Add TTM execbuf utilities. (c078aa2f) · Commits · e / devices / android_kernel_sony_msm8998

drivers/gpu/drm/ttm/Makefile

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -4,6 +4,6 @@
	ccflags-y := -Iinclude/drm		ccflags-y := -Iinclude/drm
	ttm-y := ttm_agp_backend.o ttm_memory.o ttm_tt.o ttm_bo.o \		ttm-y := ttm_agp_backend.o ttm_memory.o ttm_tt.o ttm_bo.o \
	ttm_bo_util.o ttm_bo_vm.o ttm_module.o ttm_global.o \		ttm_bo_util.o ttm_bo_vm.o ttm_module.o ttm_global.o \
	ttm_object.o ttm_lock.o		ttm_object.o ttm_lock.o ttm_execbuf_util.o

	obj-$(CONFIG_DRM_TTM) += ttm.o		obj-$(CONFIG_DRM_TTM) += ttm.o

drivers/gpu/drm/ttm/ttm_execbuf_util.c

0 → 100644

+117 −0

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			/**************************************************************************
			*
			* 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.
			*
			**************************************************************************/

			#include "ttm/ttm_execbuf_util.h"
			#include "ttm/ttm_bo_driver.h"
			#include "ttm/ttm_placement.h"
			#include <linux/wait.h>
			#include <linux/sched.h>
			#include <linux/module.h>

			void ttm_eu_backoff_reservation(struct list_head *list)
			{
			struct ttm_validate_buffer *entry;

			list_for_each_entry(entry, list, head) {
			struct ttm_buffer_object *bo = entry->bo;
			if (!entry->reserved)
			continue;

			entry->reserved = false;
			ttm_bo_unreserve(bo);
			}
			}
			EXPORT_SYMBOL(ttm_eu_backoff_reservation);

			/*
			* Reserve buffers for validation.
			*
			* If a buffer in the list is marked for CPU access, we back off and
			* wait for that buffer to become free for GPU access.
			*
			* If a buffer is reserved for another validation, the validator with
			* the highest validation sequence backs off and waits for that buffer
			* to become unreserved. This prevents deadlocks when validating multiple
			* buffers in different orders.
			*/

			int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq)
			{
			struct ttm_validate_buffer *entry;
			int ret;

			retry:
			list_for_each_entry(entry, list, head) {
			struct ttm_buffer_object *bo = entry->bo;

			entry->reserved = false;
			ret = ttm_bo_reserve(bo, true, false, true, val_seq);
			if (ret != 0) {
			ttm_eu_backoff_reservation(list);
			if (ret == -EAGAIN) {
			ret = ttm_bo_wait_unreserved(bo, true);
			if (unlikely(ret != 0))
			return ret;
			goto retry;
			} else
			return ret;
			}

			entry->reserved = true;
			if (unlikely(atomic_read(&bo->cpu_writers) > 0)) {
			ttm_eu_backoff_reservation(list);
			ret = ttm_bo_wait_cpu(bo, false);
			if (ret)
			return ret;
			goto retry;
			}
			}
			return 0;
			}
			EXPORT_SYMBOL(ttm_eu_reserve_buffers);

			void ttm_eu_fence_buffer_objects(struct list_head list, void sync_obj)
			{
			struct ttm_validate_buffer *entry;

			list_for_each_entry(entry, list, head) {
			struct ttm_buffer_object *bo = entry->bo;
			struct ttm_bo_driver *driver = bo->bdev->driver;
			void *old_sync_obj;

			spin_lock(&bo->lock);
			old_sync_obj = bo->sync_obj;
			bo->sync_obj = driver->sync_obj_ref(sync_obj);
			bo->sync_obj_arg = entry->new_sync_obj_arg;
			spin_unlock(&bo->lock);
			ttm_bo_unreserve(bo);
			entry->reserved = false;
			if (old_sync_obj)
			driver->sync_obj_unref(&old_sync_obj);
			}
			}
			EXPORT_SYMBOL(ttm_eu_fence_buffer_objects);

include/drm/ttm/ttm_execbuf_util.h

0 → 100644

+107 −0

Original line number	Original line	Diff line number	Diff line
			/**************************************************************************
			*
			* 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>
			*/

			#ifndef _TTM_EXECBUF_UTIL_H_
			#define _TTM_EXECBUF_UTIL_H_

			#include "ttm/ttm_bo_api.h"
			#include <linux/list.h>

			/**
			* struct ttm_validate_buffer
			*
			* @head: list head for thread-private list.
			* @bo: refcounted buffer object pointer.
			* @new_sync_obj_arg: New sync_obj_arg for @bo, to be used once
			* adding a new sync object.
			* @reservied: Indicates whether @bo has been reserved for validation.
			*/

			struct ttm_validate_buffer {
			struct list_head head;
			struct ttm_buffer_object *bo;
			void *new_sync_obj_arg;
			bool reserved;
			};

			/**
			* function ttm_eu_backoff_reservation
			*
			* @list: thread private list of ttm_validate_buffer structs.
			*
			* Undoes all buffer validation reservations for bos pointed to by
			* the list entries.
			*/

			extern void ttm_eu_backoff_reservation(struct list_head *list);

			/**
			* function ttm_eu_reserve_buffers
			*
			* @list: thread private list of ttm_validate_buffer structs.
			* @val_seq: A unique sequence number.
			*
			* Tries to reserve bos pointed to by the list entries for validation.
			* If the function returns 0, all buffers are marked as "unfenced",
			* taken off the lru lists and are not synced for write CPU usage.
			*
			* If the function detects a deadlock due to multiple threads trying to
			* reserve the same buffers in reverse order, all threads except one will
			* back off and retry. This function may sleep while waiting for
			* CPU write reservations to be cleared, and for other threads to
			* unreserve their buffers.
			*
			* This function may return -ERESTART or -EAGAIN if the calling process
			* receives a signal while waiting. In that case, no buffers on the list
			* will be reserved upon return.
			*
			* Buffers reserved by this function should be unreserved by
			* a call to either ttm_eu_backoff_reservation() or
			* ttm_eu_fence_buffer_objects() when command submission is complete or
			* has failed.
			*/

			extern int ttm_eu_reserve_buffers(struct list_head *list, uint32_t val_seq);

			/**
			* function ttm_eu_fence_buffer_objects.
			*
			* @list: thread private list of ttm_validate_buffer structs.
			* @sync_obj: The new sync object for the buffers.
			*
			* This function should be called when command submission is complete, and
			* it will add a new sync object to bos pointed to by entries on @list.
			* It also unreserves all buffers, putting them on lru lists.
			*
			*/

			extern void ttm_eu_fence_buffer_objects(struct list_head list, void sync_obj);

			#endif