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849ee8a2f0
Suballocating a buffer object is something that is not driver-specific and useful for many drivers. Use a slightly modified version of amdgpu_sa.c v2: - Style cleanups. - Added / Modified documentation. - Use u64 for the sizes and offset. The code dates back to 2012 and using unsigned int will probably soon come back to bite us. We can consider size_t as well for better 32-bit efficiency. - Add and document gfp, intr and align arguments to drm_suballoc_new(). - Use drm_printer for debug output. v3: - Remove stale author info (Christian König) v4: - Avoid 64-bit integer divisions (kernel test robot <lkp@intel.com>) - Use size_t rather than u64 for the managed range. (Thomas) Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Co-developed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Christian König <christian.koenig@amd.com> Acked-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Acked-by: Alex Deucher <alexdeucher@gmail.com> Acked-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230224095152.30134-2-thomas.hellstrom@linux.intel.com
108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/*
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* Copyright 2011 Red Hat Inc.
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* Copyright © 2022 Intel Corporation
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*/
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#ifndef _DRM_SUBALLOC_H_
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#define _DRM_SUBALLOC_H_
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#include <drm/drm_mm.h>
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#include <linux/dma-fence.h>
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#include <linux/types.h>
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#define DRM_SUBALLOC_MAX_QUEUES 32
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/**
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* struct drm_suballoc_manager - fenced range allocations
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* @wq: Wait queue for sleeping allocations on contention.
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* @hole: Pointer to first hole node.
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* @olist: List of allocated ranges.
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* @flist: Array[fence context hash] of queues of fenced allocated ranges.
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* @size: Size of the managed range.
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* @align: Default alignment for the managed range.
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*/
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struct drm_suballoc_manager {
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wait_queue_head_t wq;
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struct list_head *hole;
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struct list_head olist;
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struct list_head flist[DRM_SUBALLOC_MAX_QUEUES];
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size_t size;
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size_t align;
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};
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/**
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* struct drm_suballoc - Sub-allocated range
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* @olist: List link for list of allocated ranges.
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* @flist: List linkk for the manager fenced allocated ranges queues.
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* @manager: The drm_suballoc_manager.
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* @soffset: Start offset.
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* @eoffset: End offset + 1 so that @eoffset - @soffset = size.
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* @dma_fence: The fence protecting the allocation.
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*/
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struct drm_suballoc {
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struct list_head olist;
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struct list_head flist;
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struct drm_suballoc_manager *manager;
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size_t soffset;
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size_t eoffset;
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struct dma_fence *fence;
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};
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void drm_suballoc_manager_init(struct drm_suballoc_manager *sa_manager,
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size_t size, size_t align);
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void drm_suballoc_manager_fini(struct drm_suballoc_manager *sa_manager);
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struct drm_suballoc *
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drm_suballoc_new(struct drm_suballoc_manager *sa_manager, size_t size,
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gfp_t gfp, bool intr, size_t align);
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void drm_suballoc_free(struct drm_suballoc *sa, struct dma_fence *fence);
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/**
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* drm_suballoc_soffset - Range start.
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* @sa: The struct drm_suballoc.
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*
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* Return: The start of the allocated range.
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*/
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static inline size_t drm_suballoc_soffset(struct drm_suballoc *sa)
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{
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return sa->soffset;
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}
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/**
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* drm_suballoc_eoffset - Range end.
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* @sa: The struct drm_suballoc.
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*
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* Return: The end of the allocated range + 1.
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*/
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static inline size_t drm_suballoc_eoffset(struct drm_suballoc *sa)
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{
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return sa->eoffset;
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}
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/**
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* drm_suballoc_size - Range size.
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* @sa: The struct drm_suballoc.
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*
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* Return: The size of the allocated range.
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*/
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static inline size_t drm_suballoc_size(struct drm_suballoc *sa)
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{
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return sa->eoffset - sa->soffset;
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}
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#ifdef CONFIG_DEBUG_FS
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void drm_suballoc_dump_debug_info(struct drm_suballoc_manager *sa_manager,
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struct drm_printer *p,
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unsigned long long suballoc_base);
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#else
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static inline void
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drm_suballoc_dump_debug_info(struct drm_suballoc_manager *sa_manager,
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struct drm_printer *p,
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unsigned long long suballoc_base)
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{ }
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#endif
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#endif /* _DRM_SUBALLOC_H_ */
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