memory.c

  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	bool preserve = true;
144	int ret;
145
146	if (unlikely(!imem))
147		return -ENOSYS;
148
149	switch (target) {
150	case NVKM_MEM_TARGET_INST_SR_LOST:
151		preserve = false;
152		break;
153	case NVKM_MEM_TARGET_INST:
154		break;
155	default:
156		return -ENOSYS;
157	}
158
159	ret = nvkm_instobj_new(imem, size, align, zero, preserve, &memory);
160	if (ret)
161		return ret;
162
163	*pmemory = memory;
164	return 0;
165}