cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

drm_memory.c (4183B)

      1/*
      2 * \file drm_memory.c
      3 * Memory management wrappers for DRM
      4 *
      5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
      6 * \author Gareth Hughes <gareth@valinux.com>
      7 */
      8
      9/*
     10 * Created: Thu Feb  4 14:00:34 1999 by faith@valinux.com
     11 *
     12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
     13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
     14 * All Rights Reserved.
     15 *
     16 * Permission is hereby granted, free of charge, to any person obtaining a
     17 * copy of this software and associated documentation files (the "Software"),
     18 * to deal in the Software without restriction, including without limitation
     19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     20 * and/or sell copies of the Software, and to permit persons to whom the
     21 * Software is furnished to do so, subject to the following conditions:
     22 *
     23 * The above copyright notice and this permission notice (including the next
     24 * paragraph) shall be included in all copies or substantial portions of the
     25 * Software.
     26 *
     27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     33 * OTHER DEALINGS IN THE SOFTWARE.
     34 */
     35
     36#include <linux/export.h>
     37#include <linux/highmem.h>
     38#include <linux/pci.h>
     39#include <linux/vmalloc.h>
     40
     41#include <drm/drm_cache.h>
     42#include <drm/drm_device.h>
     43
     44#include "drm_legacy.h"
     45
     46#if IS_ENABLED(CONFIG_AGP)
     47
     48#ifdef HAVE_PAGE_AGP
     49# include <asm/agp.h>
     50#else
     51# ifdef __powerpc__
     52#  define PAGE_AGP	pgprot_noncached_wc(PAGE_KERNEL)
     53# else
     54#  define PAGE_AGP	PAGE_KERNEL
     55# endif
     56#endif
     57
     58static void *agp_remap(unsigned long offset, unsigned long size,
     59		       struct drm_device *dev)
     60{
     61	unsigned long i, num_pages =
     62	    PAGE_ALIGN(size) / PAGE_SIZE;
     63	struct drm_agp_mem *agpmem;
     64	struct page **page_map;
     65	struct page **phys_page_map;
     66	void *addr;
     67
     68	size = PAGE_ALIGN(size);
     69
     70#ifdef __alpha__
     71	offset -= dev->hose->mem_space->start;
     72#endif
     73
     74	list_for_each_entry(agpmem, &dev->agp->memory, head)
     75		if (agpmem->bound <= offset
     76		    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
     77		    (offset + size))
     78			break;
     79	if (&agpmem->head == &dev->agp->memory)
     80		return NULL;
     81
     82	/*
     83	 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
     84	 * the CPU do not get remapped by the GART.  We fix this by using the kernel's
     85	 * page-table instead (that's probably faster anyhow...).
     86	 */
     87	/* note: use vmalloc() because num_pages could be large... */
     88	page_map = vmalloc(array_size(num_pages, sizeof(struct page *)));
     89	if (!page_map)
     90		return NULL;
     91
     92	phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
     93	for (i = 0; i < num_pages; ++i)
     94		page_map[i] = phys_page_map[i];
     95	addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
     96	vfree(page_map);
     97
     98	return addr;
     99}
    100
    101#else /*  CONFIG_AGP  */
    102static inline void *agp_remap(unsigned long offset, unsigned long size,
    103			      struct drm_device *dev)
    104{
    105	return NULL;
    106}
    107
    108#endif /* CONFIG_AGP */
    109
    110void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev)
    111{
    112	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    113		map->handle = agp_remap(map->offset, map->size, dev);
    114	else
    115		map->handle = ioremap(map->offset, map->size);
    116}
    117EXPORT_SYMBOL(drm_legacy_ioremap);
    118
    119void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
    120{
    121	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    122		map->handle = agp_remap(map->offset, map->size, dev);
    123	else
    124		map->handle = ioremap_wc(map->offset, map->size);
    125}
    126EXPORT_SYMBOL(drm_legacy_ioremap_wc);
    127
    128void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
    129{
    130	if (!map->handle || !map->size)
    131		return;
    132
    133	if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
    134		vunmap(map->handle);
    135	else
    136		iounmap(map->handle);
    137}
    138EXPORT_SYMBOL(drm_legacy_ioremapfree);