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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright 2020-2021 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/types.h>
#include <linux/hmm.h>
#include <linux/dma-direction.h>
#include <linux/dma-mapping.h>
#include "amdgpu_sync.h"
#include "amdgpu_object.h"
#include "amdgpu_vm.h"
#include "amdgpu_mn.h"
#include "kfd_priv.h"
#include "kfd_svm.h"
#include "kfd_migrate.h"
static void svm_migrate_page_free(struct page *page)
{
}
/**
* svm_migrate_to_ram - CPU page fault handler
* @vmf: CPU vm fault vma, address
*
* Context: vm fault handler, mm->mmap_sem is taken
*
* Return:
* 0 - OK
* VM_FAULT_SIGBUS - notice application to have SIGBUS page fault
*/
static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf)
{
return VM_FAULT_SIGBUS;
}
static const struct dev_pagemap_ops svm_migrate_pgmap_ops = {
.page_free = svm_migrate_page_free,
.migrate_to_ram = svm_migrate_to_ram,
};
int svm_migrate_init(struct amdgpu_device *adev)
{
struct kfd_dev *kfddev = adev->kfd.dev;
struct dev_pagemap *pgmap;
struct resource *res;
unsigned long size;
void *r;
/* Page migration works on Vega10 or newer */
if (kfddev->device_info->asic_family < CHIP_VEGA10)
return -EINVAL;
pgmap = &kfddev->pgmap;
memset(pgmap, 0, sizeof(*pgmap));
/* TODO: register all vram to HMM for now.
* should remove reserved size
*/
size = ALIGN(adev->gmc.real_vram_size, 2ULL << 20);
res = devm_request_free_mem_region(adev->dev, &iomem_resource, size);
if (IS_ERR(res))
return -ENOMEM;
pgmap->type = MEMORY_DEVICE_PRIVATE;
pgmap->nr_range = 1;
pgmap->range.start = res->start;
pgmap->range.end = res->end;
pgmap->ops = &svm_migrate_pgmap_ops;
pgmap->owner = adev;
pgmap->flags = MIGRATE_VMA_SELECT_DEVICE_PRIVATE;
r = devm_memremap_pages(adev->dev, pgmap);
if (IS_ERR(r)) {
pr_err("failed to register HMM device memory\n");
return PTR_ERR(r);
}
pr_info("HMM registered %ldMB device memory\n", size >> 20);
return 0;
}
void svm_migrate_fini(struct amdgpu_device *adev)
{
memunmap_pages(&adev->kfd.dev->pgmap);
}
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