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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ttm_agp_backend.c (3990B)

      1/* SPDX-License-Identifier: GPL-2.0 OR MIT */
      2/**************************************************************************
      3 *
      4 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
      5 * All Rights Reserved.
      6 *
      7 * Permission is hereby granted, free of charge, to any person obtaining a
      8 * copy of this software and associated documentation files (the
      9 * "Software"), to deal in the Software without restriction, including
     10 * without limitation the rights to use, copy, modify, merge, publish,
     11 * distribute, sub license, and/or sell copies of the Software, and to
     12 * permit persons to whom the Software is furnished to do so, subject to
     13 * the following conditions:
     14 *
     15 * The above copyright notice and this permission notice (including the
     16 * next paragraph) shall be included in all copies or substantial portions
     17 * of the Software.
     18 *
     19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     21 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     22 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     25 * USE OR OTHER DEALINGS IN THE SOFTWARE.
     26 *
     27 **************************************************************************/
     28/*
     29 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
     30 *          Keith Packard.
     31 */
     32
     33#define pr_fmt(fmt) "[TTM] " fmt
     34
     35#include <drm/ttm/ttm_device.h>
     36#include <drm/ttm/ttm_tt.h>
     37#include <drm/ttm/ttm_resource.h>
     38#include <linux/agp_backend.h>
     39#include <linux/module.h>
     40#include <linux/slab.h>
     41#include <linux/io.h>
     42#include <asm/agp.h>
     43
     44struct ttm_agp_backend {
     45	struct ttm_tt ttm;
     46	struct agp_memory *mem;
     47	struct agp_bridge_data *bridge;
     48};
     49
     50int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_resource *bo_mem)
     51{
     52	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
     53	struct page *dummy_read_page = ttm_glob.dummy_read_page;
     54	struct agp_memory *mem;
     55	int ret, cached = ttm->caching == ttm_cached;
     56	unsigned i;
     57
     58	if (agp_be->mem)
     59		return 0;
     60
     61	mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
     62	if (unlikely(mem == NULL))
     63		return -ENOMEM;
     64
     65	mem->page_count = 0;
     66	for (i = 0; i < ttm->num_pages; i++) {
     67		struct page *page = ttm->pages[i];
     68
     69		if (!page)
     70			page = dummy_read_page;
     71
     72		mem->pages[mem->page_count++] = page;
     73	}
     74	agp_be->mem = mem;
     75
     76	mem->is_flushed = 1;
     77	mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
     78
     79	ret = agp_bind_memory(mem, bo_mem->start);
     80	if (ret)
     81		pr_err("AGP Bind memory failed\n");
     82
     83	return ret;
     84}
     85EXPORT_SYMBOL(ttm_agp_bind);
     86
     87void ttm_agp_unbind(struct ttm_tt *ttm)
     88{
     89	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
     90
     91	if (agp_be->mem) {
     92		if (agp_be->mem->is_bound) {
     93			agp_unbind_memory(agp_be->mem);
     94			return;
     95		}
     96		agp_free_memory(agp_be->mem);
     97		agp_be->mem = NULL;
     98	}
     99}
    100EXPORT_SYMBOL(ttm_agp_unbind);
    101
    102bool ttm_agp_is_bound(struct ttm_tt *ttm)
    103{
    104	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
    105
    106	if (!ttm)
    107		return false;
    108
    109	return (agp_be->mem != NULL);
    110}
    111EXPORT_SYMBOL(ttm_agp_is_bound);
    112
    113void ttm_agp_destroy(struct ttm_tt *ttm)
    114{
    115	struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
    116
    117	if (agp_be->mem)
    118		ttm_agp_unbind(ttm);
    119	ttm_tt_fini(ttm);
    120	kfree(agp_be);
    121}
    122EXPORT_SYMBOL(ttm_agp_destroy);
    123
    124struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
    125				 struct agp_bridge_data *bridge,
    126				 uint32_t page_flags)
    127{
    128	struct ttm_agp_backend *agp_be;
    129
    130	agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
    131	if (!agp_be)
    132		return NULL;
    133
    134	agp_be->mem = NULL;
    135	agp_be->bridge = bridge;
    136
    137	if (ttm_tt_init(&agp_be->ttm, bo, page_flags, ttm_write_combined, 0)) {
    138		kfree(agp_be);
    139		return NULL;
    140	}
    141
    142	return &agp_be->ttm;
    143}
    144EXPORT_SYMBOL(ttm_agp_tt_create);