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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright 2020 Advanced Micro Devices, Inc.
*
* 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, sublicense,
* 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Christian König
*/
#ifndef __AMDGPU_RES_CURSOR_H__
#define __AMDGPU_RES_CURSOR_H__
#include <drm/drm_mm.h>
#include <drm/ttm/ttm_resource.h>
#include <drm/ttm/ttm_range_manager.h>
/* state back for walking over vram_mgr and gtt_mgr allocations */
struct amdgpu_res_cursor {
uint64_t start;
uint64_t size;
uint64_t remaining;
struct drm_mm_node *node;
};
/**
* amdgpu_res_first - initialize a amdgpu_res_cursor
*
* @res: TTM resource object to walk
* @start: Start of the range
* @size: Size of the range
* @cur: cursor object to initialize
*
* Start walking over the range of allocations between @start and @size.
*/
static inline void amdgpu_res_first(struct ttm_resource *res,
uint64_t start, uint64_t size,
struct amdgpu_res_cursor *cur)
{
struct drm_mm_node *node;
if (!res) {
cur->start = start;
cur->size = size;
cur->remaining = size;
cur->node = NULL;
return;
}
BUG_ON(start + size > res->num_pages << PAGE_SHIFT);
node = to_ttm_range_mgr_node(res)->mm_nodes;
while (start >= node->size << PAGE_SHIFT)
start -= node++->size << PAGE_SHIFT;
cur->start = (node->start << PAGE_SHIFT) + start;
cur->size = min((node->size << PAGE_SHIFT) - start, size);
cur->remaining = size;
cur->node = node;
}
/**
* amdgpu_res_next - advance the cursor
*
* @cur: the cursor to advance
* @size: number of bytes to move forward
*
* Move the cursor @size bytes forwrad, walking to the next node if necessary.
*/
static inline void amdgpu_res_next(struct amdgpu_res_cursor *cur, uint64_t size)
{
struct drm_mm_node *node = cur->node;
BUG_ON(size > cur->remaining);
cur->remaining -= size;
if (!cur->remaining)
return;
cur->size -= size;
if (cur->size) {
cur->start += size;
return;
}
cur->node = ++node;
cur->start = node->start << PAGE_SHIFT;
cur->size = min(node->size << PAGE_SHIFT, cur->remaining);
}
#endif
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