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_preempt_mgr.c (4326B)

      1// SPDX-License-Identifier: GPL-2.0 OR MIT
      2/*
      3 * Copyright 2016-2021 Advanced Micro Devices, Inc.
      4 *
      5 * Permission is hereby granted, free of charge, to any person obtaining a
      6 * copy of this software and associated documentation files (the "Software"),
      7 * to deal in the Software without restriction, including without limitation
      8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      9 * and/or sell copies of the Software, and to permit persons to whom the
     10 * Software is furnished to do so, subject to the following conditions:
     11 *
     12 * The above copyright notice and this permission notice shall be included in
     13 * all copies or substantial portions of the Software.
     14 *
     15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     21 * OTHER DEALINGS IN THE SOFTWARE.
     22 *
     23 * Authors: Christian König, Felix Kuehling
     24 */
     25
     26#include "amdgpu.h"
     27
     28/**
     29 * DOC: mem_info_preempt_used
     30 *
     31 * The amdgpu driver provides a sysfs API for reporting current total amount of
     32 * used preemptible memory.
     33 * The file mem_info_preempt_used is used for this, and returns the current
     34 * used size of the preemptible block, in bytes
     35 */
     36static ssize_t mem_info_preempt_used_show(struct device *dev,
     37					  struct device_attribute *attr,
     38					  char *buf)
     39{
     40	struct drm_device *ddev = dev_get_drvdata(dev);
     41	struct amdgpu_device *adev = drm_to_adev(ddev);
     42	struct ttm_resource_manager *man = &adev->mman.preempt_mgr;
     43
     44	return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
     45}
     46
     47static DEVICE_ATTR_RO(mem_info_preempt_used);
     48
     49/**
     50 * amdgpu_preempt_mgr_new - allocate a new node
     51 *
     52 * @man: TTM memory type manager
     53 * @tbo: TTM BO we need this range for
     54 * @place: placement flags and restrictions
     55 * @res: TTM memory object
     56 *
     57 * Dummy, just count the space used without allocating resources or any limit.
     58 */
     59static int amdgpu_preempt_mgr_new(struct ttm_resource_manager *man,
     60				  struct ttm_buffer_object *tbo,
     61				  const struct ttm_place *place,
     62				  struct ttm_resource **res)
     63{
     64	*res = kzalloc(sizeof(**res), GFP_KERNEL);
     65	if (!*res)
     66		return -ENOMEM;
     67
     68	ttm_resource_init(tbo, place, *res);
     69	(*res)->start = AMDGPU_BO_INVALID_OFFSET;
     70	return 0;
     71}
     72
     73/**
     74 * amdgpu_preempt_mgr_del - free ranges
     75 *
     76 * @man: TTM memory type manager
     77 * @res: TTM memory object
     78 *
     79 * Free the allocated GTT again.
     80 */
     81static void amdgpu_preempt_mgr_del(struct ttm_resource_manager *man,
     82				   struct ttm_resource *res)
     83{
     84	ttm_resource_fini(man, res);
     85	kfree(res);
     86}
     87
     88static const struct ttm_resource_manager_func amdgpu_preempt_mgr_func = {
     89	.alloc = amdgpu_preempt_mgr_new,
     90	.free = amdgpu_preempt_mgr_del,
     91};
     92
     93/**
     94 * amdgpu_preempt_mgr_init - init PREEMPT manager and DRM MM
     95 *
     96 * @adev: amdgpu_device pointer
     97 *
     98 * Allocate and initialize the GTT manager.
     99 */
    100int amdgpu_preempt_mgr_init(struct amdgpu_device *adev)
    101{
    102	struct ttm_resource_manager *man = &adev->mman.preempt_mgr;
    103	int ret;
    104
    105	man->use_tt = true;
    106	man->func = &amdgpu_preempt_mgr_func;
    107
    108	ttm_resource_manager_init(man, &adev->mman.bdev, (1 << 30));
    109
    110	ret = device_create_file(adev->dev, &dev_attr_mem_info_preempt_used);
    111	if (ret) {
    112		DRM_ERROR("Failed to create device file mem_info_preempt_used\n");
    113		return ret;
    114	}
    115
    116	ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, man);
    117	ttm_resource_manager_set_used(man, true);
    118	return 0;
    119}
    120
    121/**
    122 * amdgpu_preempt_mgr_fini - free and destroy GTT manager
    123 *
    124 * @adev: amdgpu_device pointer
    125 *
    126 * Destroy and free the GTT manager, returns -EBUSY if ranges are still
    127 * allocated inside it.
    128 */
    129void amdgpu_preempt_mgr_fini(struct amdgpu_device *adev)
    130{
    131	struct ttm_resource_manager *man = &adev->mman.preempt_mgr;
    132	int ret;
    133
    134	ttm_resource_manager_set_used(man, false);
    135
    136	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
    137	if (ret)
    138		return;
    139
    140	device_remove_file(adev->dev, &dev_attr_mem_info_preempt_used);
    141
    142	ttm_resource_manager_cleanup(man);
    143	ttm_set_driver_manager(&adev->mman.bdev, AMDGPU_PL_PREEMPT, NULL);
    144}