cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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amdgpu_vram_mgr.h (2739B)

      1/* SPDX-License-Identifier: MIT
      2 * Copyright 2021 Advanced Micro Devices, Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 */
     23
     24#ifndef __AMDGPU_VRAM_MGR_H__
     25#define __AMDGPU_VRAM_MGR_H__
     26
     27#include <drm/drm_buddy.h>
     28
     29struct amdgpu_vram_mgr {
     30	struct ttm_resource_manager manager;
     31	struct drm_buddy mm;
     32	/* protects access to buffer objects */
     33	struct mutex lock;
     34	struct list_head reservations_pending;
     35	struct list_head reserved_pages;
     36	atomic64_t vis_usage;
     37	u64 default_page_size;
     38};
     39
     40struct amdgpu_vram_mgr_resource {
     41	struct ttm_resource base;
     42	struct list_head blocks;
     43	unsigned long flags;
     44};
     45
     46static inline u64 amdgpu_vram_mgr_block_start(struct drm_buddy_block *block)
     47{
     48	return drm_buddy_block_offset(block);
     49}
     50
     51static inline u64 amdgpu_vram_mgr_block_size(struct drm_buddy_block *block)
     52{
     53	return PAGE_SIZE << drm_buddy_block_order(block);
     54}
     55
     56static inline struct drm_buddy_block *
     57amdgpu_vram_mgr_first_block(struct list_head *list)
     58{
     59	return list_first_entry_or_null(list, struct drm_buddy_block, link);
     60}
     61
     62static inline bool amdgpu_is_vram_mgr_blocks_contiguous(struct list_head *head)
     63{
     64	struct drm_buddy_block *block;
     65	u64 start, size;
     66
     67	block = amdgpu_vram_mgr_first_block(head);
     68	if (!block)
     69		return false;
     70
     71	while (head != block->link.next) {
     72		start = amdgpu_vram_mgr_block_start(block);
     73		size = amdgpu_vram_mgr_block_size(block);
     74
     75		block = list_entry(block->link.next, struct drm_buddy_block, link);
     76		if (start + size != amdgpu_vram_mgr_block_start(block))
     77			return false;
     78	}
     79
     80	return true;
     81}
     82
     83static inline struct amdgpu_vram_mgr_resource *
     84to_amdgpu_vram_mgr_resource(struct ttm_resource *res)
     85{
     86	return container_of(res, struct amdgpu_vram_mgr_resource, base);
     87}
     88
     89#endif