1 files changed, 104 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
new file mode 100644
index 000000000000..b32d8fdfe8e9
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
@@ -0,0 +1,104 @@
+// 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);
+}