/*
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* Copyright 2015 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs <bskeggs@redhat.com>
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*/
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#include <core/memory.h>
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#include <core/mm.h>
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#include <subdev/fb.h>
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#include <subdev/instmem.h>
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void
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nvkm_memory_tags_put(struct nvkm_memory *memory, struct nvkm_device *device,
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struct nvkm_tags **ptags)
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{
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struct nvkm_fb *fb = device->fb;
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struct nvkm_tags *tags = *ptags;
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if (tags) {
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mutex_lock(&fb->subdev.mutex);
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if (refcount_dec_and_test(&tags->refcount)) {
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nvkm_mm_free(&fb->tags, &tags->mn);
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kfree(memory->tags);
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memory->tags = NULL;
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}
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mutex_unlock(&fb->subdev.mutex);
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*ptags = NULL;
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}
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}
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int
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nvkm_memory_tags_get(struct nvkm_memory *memory, struct nvkm_device *device,
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u32 nr, void (*clr)(struct nvkm_device *, u32, u32),
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struct nvkm_tags **ptags)
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{
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struct nvkm_fb *fb = device->fb;
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struct nvkm_tags *tags;
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mutex_lock(&fb->subdev.mutex);
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if ((tags = memory->tags)) {
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/* If comptags exist for the memory, but a different amount
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* than requested, the buffer is being mapped with settings
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* that are incompatible with existing mappings.
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*/
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if (tags->mn && tags->mn->length != nr) {
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mutex_unlock(&fb->subdev.mutex);
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return -EINVAL;
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}
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refcount_inc(&tags->refcount);
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mutex_unlock(&fb->subdev.mutex);
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*ptags = tags;
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return 0;
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}
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if (!(tags = kmalloc(sizeof(*tags), GFP_KERNEL))) {
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mutex_unlock(&fb->subdev.mutex);
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return -ENOMEM;
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}
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if (!nvkm_mm_head(&fb->tags, 0, 1, nr, nr, 1, &tags->mn)) {
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if (clr)
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clr(device, tags->mn->offset, tags->mn->length);
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} else {
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/* Failure to allocate HW comptags is not an error, the
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* caller should fall back to an uncompressed map.
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*
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* As memory can be mapped in multiple places, we still
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* need to track the allocation failure and ensure that
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* any additional mappings remain uncompressed.
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*
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* This is handled by returning an empty nvkm_tags.
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*/
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tags->mn = NULL;
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}
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refcount_set(&tags->refcount, 1);
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*ptags = memory->tags = tags;
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mutex_unlock(&fb->subdev.mutex);
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return 0;
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}
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void
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nvkm_memory_ctor(const struct nvkm_memory_func *func,
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struct nvkm_memory *memory)
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{
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memory->func = func;
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kref_init(&memory->kref);
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}
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static void
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nvkm_memory_del(struct kref *kref)
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{
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struct nvkm_memory *memory = container_of(kref, typeof(*memory), kref);
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if (!WARN_ON(!memory->func)) {
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if (memory->func->dtor)
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memory = memory->func->dtor(memory);
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kfree(memory);
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}
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}
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void
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nvkm_memory_unref(struct nvkm_memory **pmemory)
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{
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struct nvkm_memory *memory = *pmemory;
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if (memory) {
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kref_put(&memory->kref, nvkm_memory_del);
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*pmemory = NULL;
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}
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}
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struct nvkm_memory *
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nvkm_memory_ref(struct nvkm_memory *memory)
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{
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if (memory)
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kref_get(&memory->kref);
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return memory;
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}
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int
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nvkm_memory_new(struct nvkm_device *device, enum nvkm_memory_target target,
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u64 size, u32 align, bool zero,
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struct nvkm_memory **pmemory)
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{
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struct nvkm_instmem *imem = device->imem;
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struct nvkm_memory *memory;
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int ret;
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if (unlikely(target != NVKM_MEM_TARGET_INST || !imem))
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return -ENOSYS;
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ret = nvkm_instobj_new(imem, size, align, zero, &memory);
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if (ret)
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return ret;
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*pmemory = memory;
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return 0;
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}
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