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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memory.c (4210B)

      1/*
      2 * Copyright 2015 Red Hat 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 * Authors: Ben Skeggs <bskeggs@redhat.com>
     23 */
     24#include <core/memory.h>
     25#include <core/mm.h>
     26#include <subdev/fb.h>
     27#include <subdev/instmem.h>
     28
     29void
     30nvkm_memory_tags_put(struct nvkm_memory *memory, struct nvkm_device *device,
     31		     struct nvkm_tags **ptags)
     32{
     33	struct nvkm_fb *fb = device->fb;
     34	struct nvkm_tags *tags = *ptags;
     35	if (tags) {
     36		mutex_lock(&fb->tags.mutex);
     37		if (refcount_dec_and_test(&tags->refcount)) {
     38			nvkm_mm_free(&fb->tags.mm, &tags->mn);
     39			kfree(memory->tags);
     40			memory->tags = NULL;
     41		}
     42		mutex_unlock(&fb->tags.mutex);
     43		*ptags = NULL;
     44	}
     45}
     46
     47int
     48nvkm_memory_tags_get(struct nvkm_memory *memory, struct nvkm_device *device,
     49		     u32 nr, void (*clr)(struct nvkm_device *, u32, u32),
     50		     struct nvkm_tags **ptags)
     51{
     52	struct nvkm_fb *fb = device->fb;
     53	struct nvkm_tags *tags;
     54
     55	mutex_lock(&fb->tags.mutex);
     56	if ((tags = memory->tags)) {
     57		/* If comptags exist for the memory, but a different amount
     58		 * than requested, the buffer is being mapped with settings
     59		 * that are incompatible with existing mappings.
     60		 */
     61		if (tags->mn && tags->mn->length != nr) {
     62			mutex_unlock(&fb->tags.mutex);
     63			return -EINVAL;
     64		}
     65
     66		refcount_inc(&tags->refcount);
     67		mutex_unlock(&fb->tags.mutex);
     68		*ptags = tags;
     69		return 0;
     70	}
     71
     72	if (!(tags = kmalloc(sizeof(*tags), GFP_KERNEL))) {
     73		mutex_unlock(&fb->tags.mutex);
     74		return -ENOMEM;
     75	}
     76
     77	if (!nvkm_mm_head(&fb->tags.mm, 0, 1, nr, nr, 1, &tags->mn)) {
     78		if (clr)
     79			clr(device, tags->mn->offset, tags->mn->length);
     80	} else {
     81		/* Failure to allocate HW comptags is not an error, the
     82		 * caller should fall back to an uncompressed map.
     83		 *
     84		 * As memory can be mapped in multiple places, we still
     85		 * need to track the allocation failure and ensure that
     86		 * any additional mappings remain uncompressed.
     87		 *
     88		 * This is handled by returning an empty nvkm_tags.
     89		 */
     90		tags->mn = NULL;
     91	}
     92
     93	refcount_set(&tags->refcount, 1);
     94	*ptags = memory->tags = tags;
     95	mutex_unlock(&fb->tags.mutex);
     96	return 0;
     97}
     98
     99void
    100nvkm_memory_ctor(const struct nvkm_memory_func *func,
    101		 struct nvkm_memory *memory)
    102{
    103	memory->func = func;
    104	kref_init(&memory->kref);
    105}
    106
    107static void
    108nvkm_memory_del(struct kref *kref)
    109{
    110	struct nvkm_memory *memory = container_of(kref, typeof(*memory), kref);
    111	if (!WARN_ON(!memory->func)) {
    112		if (memory->func->dtor)
    113			memory = memory->func->dtor(memory);
    114		kfree(memory);
    115	}
    116}
    117
    118void
    119nvkm_memory_unref(struct nvkm_memory **pmemory)
    120{
    121	struct nvkm_memory *memory = *pmemory;
    122	if (memory) {
    123		kref_put(&memory->kref, nvkm_memory_del);
    124		*pmemory = NULL;
    125	}
    126}
    127
    128struct nvkm_memory *
    129nvkm_memory_ref(struct nvkm_memory *memory)
    130{
    131	if (memory)
    132		kref_get(&memory->kref);
    133	return memory;
    134}
    135
    136int
    137nvkm_memory_new(struct nvkm_device *device, enum nvkm_memory_target target,
    138		u64 size, u32 align, bool zero,
    139		struct nvkm_memory **pmemory)
    140{
    141	struct nvkm_instmem *imem = device->imem;
    142	struct nvkm_memory *memory;
    143	int ret;
    144
    145	if (unlikely(target != NVKM_MEM_TARGET_INST || !imem))
    146		return -ENOSYS;
    147
    148	ret = nvkm_instobj_new(imem, size, align, zero, &memory);
    149	if (ret)
    150		return ret;
    151
    152	*pmemory = memory;
    153	return 0;
    154}