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

via_mm.c (6526B)


      1/*
      2 * Copyright 2006 Tungsten Graphics Inc., Bismarck, ND., USA.
      3 * All rights reserved.
      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, sub license,
      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 (including the
     13 * next paragraph) shall be included in all copies or substantial portions
     14 * of the Software.
     15 *
     16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     19 * THE AUTHORS OR COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
     20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     22 * DEALINGS IN THE SOFTWARE.
     23 */
     24/*
     25 * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
     26 */
     27
     28#include <linux/slab.h>
     29
     30#include <drm/drm_device.h>
     31#include <drm/drm_file.h>
     32#include <drm/via_drm.h>
     33
     34#include "via_drv.h"
     35
     36#define VIA_MM_ALIGN_SHIFT 4
     37#define VIA_MM_ALIGN_MASK ((1 << VIA_MM_ALIGN_SHIFT) - 1)
     38
     39struct via_memblock {
     40	struct drm_mm_node mm_node;
     41	struct list_head owner_list;
     42};
     43
     44int via_agp_init(struct drm_device *dev, void *data, struct drm_file *file_priv)
     45{
     46	drm_via_agp_t *agp = data;
     47	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
     48
     49	mutex_lock(&dev->struct_mutex);
     50	drm_mm_init(&dev_priv->agp_mm, 0, agp->size >> VIA_MM_ALIGN_SHIFT);
     51
     52	dev_priv->agp_initialized = 1;
     53	dev_priv->agp_offset = agp->offset;
     54	mutex_unlock(&dev->struct_mutex);
     55
     56	DRM_DEBUG("offset = %u, size = %u\n", agp->offset, agp->size);
     57	return 0;
     58}
     59
     60int via_fb_init(struct drm_device *dev, void *data, struct drm_file *file_priv)
     61{
     62	drm_via_fb_t *fb = data;
     63	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
     64
     65	mutex_lock(&dev->struct_mutex);
     66	drm_mm_init(&dev_priv->vram_mm, 0, fb->size >> VIA_MM_ALIGN_SHIFT);
     67
     68	dev_priv->vram_initialized = 1;
     69	dev_priv->vram_offset = fb->offset;
     70
     71	mutex_unlock(&dev->struct_mutex);
     72	DRM_DEBUG("offset = %u, size = %u\n", fb->offset, fb->size);
     73
     74	return 0;
     75
     76}
     77
     78int via_final_context(struct drm_device *dev, int context)
     79{
     80	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
     81
     82	via_release_futex(dev_priv, context);
     83
     84	/* Linux specific until context tracking code gets ported to BSD */
     85	/* Last context, perform cleanup */
     86	if (list_is_singular(&dev->ctxlist)) {
     87		DRM_DEBUG("Last Context\n");
     88		drm_legacy_irq_uninstall(dev);
     89		via_cleanup_futex(dev_priv);
     90		via_do_cleanup_map(dev);
     91	}
     92	return 1;
     93}
     94
     95void via_lastclose(struct drm_device *dev)
     96{
     97	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
     98
     99	if (!dev_priv)
    100		return;
    101
    102	mutex_lock(&dev->struct_mutex);
    103	if (dev_priv->vram_initialized) {
    104		drm_mm_takedown(&dev_priv->vram_mm);
    105		dev_priv->vram_initialized = 0;
    106	}
    107	if (dev_priv->agp_initialized) {
    108		drm_mm_takedown(&dev_priv->agp_mm);
    109		dev_priv->agp_initialized = 0;
    110	}
    111	mutex_unlock(&dev->struct_mutex);
    112}
    113
    114int via_mem_alloc(struct drm_device *dev, void *data,
    115		  struct drm_file *file)
    116{
    117	drm_via_mem_t *mem = data;
    118	int retval = 0, user_key;
    119	struct via_memblock *item;
    120	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
    121	struct via_file_private *file_priv = file->driver_priv;
    122	unsigned long tmpSize;
    123
    124	if (mem->type > VIA_MEM_AGP) {
    125		DRM_ERROR("Unknown memory type allocation\n");
    126		return -EINVAL;
    127	}
    128	mutex_lock(&dev->struct_mutex);
    129	if (0 == ((mem->type == VIA_MEM_VIDEO) ? dev_priv->vram_initialized :
    130		      dev_priv->agp_initialized)) {
    131		mutex_unlock(&dev->struct_mutex);
    132		DRM_ERROR
    133		    ("Attempt to allocate from uninitialized memory manager.\n");
    134		return -EINVAL;
    135	}
    136
    137	item = kzalloc(sizeof(*item), GFP_KERNEL);
    138	if (!item) {
    139		retval = -ENOMEM;
    140		goto fail_alloc;
    141	}
    142
    143	tmpSize = (mem->size + VIA_MM_ALIGN_MASK) >> VIA_MM_ALIGN_SHIFT;
    144	if (mem->type == VIA_MEM_AGP)
    145		retval = drm_mm_insert_node(&dev_priv->agp_mm,
    146					    &item->mm_node,
    147					    tmpSize);
    148	else
    149		retval = drm_mm_insert_node(&dev_priv->vram_mm,
    150					    &item->mm_node,
    151					    tmpSize);
    152	if (retval)
    153		goto fail_alloc;
    154
    155	retval = idr_alloc(&dev_priv->object_idr, item, 1, 0, GFP_KERNEL);
    156	if (retval < 0)
    157		goto fail_idr;
    158	user_key = retval;
    159
    160	list_add(&item->owner_list, &file_priv->obj_list);
    161	mutex_unlock(&dev->struct_mutex);
    162
    163	mem->offset = ((mem->type == VIA_MEM_VIDEO) ?
    164		      dev_priv->vram_offset : dev_priv->agp_offset) +
    165	    ((item->mm_node.start) << VIA_MM_ALIGN_SHIFT);
    166	mem->index = user_key;
    167
    168	return 0;
    169
    170fail_idr:
    171	drm_mm_remove_node(&item->mm_node);
    172fail_alloc:
    173	kfree(item);
    174	mutex_unlock(&dev->struct_mutex);
    175
    176	mem->offset = 0;
    177	mem->size = 0;
    178	mem->index = 0;
    179	DRM_DEBUG("Video memory allocation failed\n");
    180
    181	return retval;
    182}
    183
    184int via_mem_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
    185{
    186	drm_via_private_t *dev_priv = dev->dev_private;
    187	drm_via_mem_t *mem = data;
    188	struct via_memblock *obj;
    189
    190	mutex_lock(&dev->struct_mutex);
    191	obj = idr_find(&dev_priv->object_idr, mem->index);
    192	if (obj == NULL) {
    193		mutex_unlock(&dev->struct_mutex);
    194		return -EINVAL;
    195	}
    196
    197	idr_remove(&dev_priv->object_idr, mem->index);
    198	list_del(&obj->owner_list);
    199	drm_mm_remove_node(&obj->mm_node);
    200	kfree(obj);
    201	mutex_unlock(&dev->struct_mutex);
    202
    203	DRM_DEBUG("free = 0x%lx\n", mem->index);
    204
    205	return 0;
    206}
    207
    208
    209void via_reclaim_buffers_locked(struct drm_device *dev,
    210				struct drm_file *file)
    211{
    212	struct via_file_private *file_priv = file->driver_priv;
    213	struct via_memblock *entry, *next;
    214
    215	if (!(dev->master && file->master->lock.hw_lock))
    216		return;
    217
    218	drm_legacy_idlelock_take(&file->master->lock);
    219
    220	mutex_lock(&dev->struct_mutex);
    221	if (list_empty(&file_priv->obj_list)) {
    222		mutex_unlock(&dev->struct_mutex);
    223		drm_legacy_idlelock_release(&file->master->lock);
    224
    225		return;
    226	}
    227
    228	via_driver_dma_quiescent(dev);
    229
    230	list_for_each_entry_safe(entry, next, &file_priv->obj_list,
    231				 owner_list) {
    232		list_del(&entry->owner_list);
    233		drm_mm_remove_node(&entry->mm_node);
    234		kfree(entry);
    235	}
    236	mutex_unlock(&dev->struct_mutex);
    237
    238	drm_legacy_idlelock_release(&file->master->lock);
    239
    240	return;
    241}