Quelle drm_suballoc.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 OR MIT */
/*
* Copyright 2011 Red Hat Inc.
* Copyright © 2022 Intel Corporation
*/
#ifndef _DRM_SUBALLOC_H_
#define _DRM_SUBALLOC_H_

#include <drm/drm_mm.h>

#include <linux/dma-fence.h>
#include <linux/types.h>

#define DRM_SUBALLOC_MAX_QUEUES 32
/**
* struct drm_suballoc_manager - fenced range allocations
* @wq: Wait queue for sleeping allocations on contention.
* @hole: Pointer to first hole node.
* @olist: List of allocated ranges.
* @flist: Array[fence context hash] of queues of fenced allocated ranges.
* @size: Size of the managed range.
* @align: Default alignment for the managed range.
*/
struct drm_suballoc_manager {
wait_queue_head_t wq;
struct list_head *hole;
struct list_head olist;
struct list_head flist[DRM_SUBALLOC_MAX_QUEUES];
size_t size;
size_t align;
};

/**
* struct drm_suballoc - Sub-allocated range
* @olist: List link for list of allocated ranges.
* @flist: List linkk for the manager fenced allocated ranges queues.
* @manager: The drm_suballoc_manager.
* @soffset: Start offset.
* @eoffset: End offset + 1 so that @eoffset - @soffset = size.
* @fence: The fence protecting the allocation.
*/
struct drm_suballoc {
struct list_head olist;
struct list_head flist;
struct drm_suballoc_manager *manager;
size_t soffset;
size_t eoffset;
struct dma_fence *fence;
};

void drm_suballoc_manager_init(struct drm_suballoc_manager *sa_manager,
          size_t size, size_t align);

void drm_suballoc_manager_fini(struct drm_suballoc_manager *sa_manager);

struct drm_suballoc *
drm_suballoc_new(struct drm_suballoc_manager *sa_manager, size_t size,
   gfp_t gfp, bool intr, size_t align);

void drm_suballoc_free(struct drm_suballoc *sa, struct dma_fence *fence);

/**
* drm_suballoc_soffset - Range start.
* @sa: The struct drm_suballoc.
*
* Return: The start of the allocated range.
*/
static inline size_t drm_suballoc_soffset(struct drm_suballoc *sa)
{
return sa->soffset;
}

/**
* drm_suballoc_eoffset - Range end.
* @sa: The struct drm_suballoc.
*
* Return: The end of the allocated range + 1.
*/
static inline size_t drm_suballoc_eoffset(struct drm_suballoc *sa)
{
return sa->eoffset;
}

/**
* drm_suballoc_size - Range size.
* @sa: The struct drm_suballoc.
*
* Return: The size of the allocated range.
*/
static inline size_t drm_suballoc_size(struct drm_suballoc *sa)
{
return sa->eoffset - sa->soffset;
}

#ifdef CONFIG_DEBUG_FS
void drm_suballoc_dump_debug_info(struct drm_suballoc_manager *sa_manager,
      struct drm_printer *p,
      unsigned long long suballoc_base);
#else
static inline void
drm_suballoc_dump_debug_info(struct drm_suballoc_manager *sa_manager,
        struct drm_printer *p,
        unsigned long long suballoc_base)
{ }

#endif

#endif /* _DRM_SUBALLOC_H_ */

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