accel/amdxdna/amdxdna_gem.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2024, Advanced Micro Devices, Inc.
 */

#include <drm/amdxdna_accel.h>
#include <drm/drm_cache.h>
#include <drm/drm_device.h>
#include <drm/drm_gem.h>
#include <drm/drm_gem_shmem_helper.h>
#include <drm/drm_print.h>
#include <drm/gpu_scheduler.h>
#include <linux/dma-buf.h>
#include <linux/dma-direct.h>
#include <linux/iosys-map.h>
#include <linux/pagemap.h>
#include <linux/vmalloc.h>

#include "amdxdna_cbuf.h"
#include "amdxdna_ctx.h"
#include "amdxdna_gem.h"
#include "amdxdna_pci_drv.h"
#include "amdxdna_ubuf.h"

MODULE_IMPORT_NS("DMA_BUF");

/*
 * The dev BO could be across multiple heap BO chunks. The heap chunks should
 * be mapped to userspace and the userspace virtual address should be
 * contiguous.
 */
static int
amdxdna_init_dev_bo(struct amdxdna_gem_obj *dev_bo)
{
	struct amdxdna_client *client = dev_bo->client;
	struct amdxdna_dev *xdna = client->xdna;
	struct amdxdna_gem_obj *heap;
	u64 heap_addr, exp_heap_uva;
	u32 heap_id;

	if (xa_empty(&client->dev_heap_xa)) {
		XDNA_DBG(xdna, "Empty heap xa");
		return -EAGAIN;
	}

	for (heap_id = 0; heap_id < client->dev_heap_nid; heap_id++) {
		heap = xa_load(&client->dev_heap_xa, heap_id);
		if (!heap) {
			XDNA_ERR(xdna, "Failed to load heap %d", heap_id);
			return -EINVAL;
		}
		heap_addr = amdxdna_gem_dev_addr(heap);
		if (heap_addr > dev_bo->mm_node.start)
			break;
	}

	heap_id--;
	heap = xa_load(&client->dev_heap_xa, heap_id);
	exp_heap_uva = amdxdna_gem_uva(heap);
	heap_addr = amdxdna_gem_dev_addr(heap);
	dev_bo->heap_start_id = heap_id;
	dev_bo->mem.uva = dev_bo->mm_node.start - heap_addr + exp_heap_uva;

	for (; heap_id < client->dev_heap_nid; heap_id++) {
		heap = xa_load(&client->dev_heap_xa, heap_id);
		if (!heap) {
			XDNA_ERR(xdna, "Failed to load heap %d", heap_id);
			return -EINVAL;
		}
		heap_addr = amdxdna_gem_uva(heap);
		if (heap_addr == AMDXDNA_INVALID_ADDR) {
			XDNA_ERR(xdna, "Heap %d is not mapped", heap_id);
			return -EAGAIN;
		}

		if (heap_addr != exp_heap_uva) {
			XDNA_ERR(xdna, "Heap %d uva is not contiguous", heap_id);
			return -EINVAL;
		}

		if (heap->dev_addr + heap->mem.size >=
		    dev_bo->mm_node.start + dev_bo->mem.size)
			break;

		exp_heap_uva += heap->mem.size;
	}

	if (heap_id == client->dev_heap_nid) {
		XDNA_DBG(xdna, "Can not find heap end");
		return -EAGAIN;
	}

	dev_bo->heap_end_id = heap_id;

	return 0;
}

static int
amdxdna_gem_heap_alloc(struct amdxdna_gem_obj *abo)
{
	struct amdxdna_client *client = abo->client;
	struct amdxdna_dev *xdna = client->xdna;
	struct amdxdna_mem *mem = &abo->mem;
	struct amdxdna_gem_obj *heap;
	unsigned long heap_id;
	u32 align;
	int ret;

	mutex_lock(&client->mm_lock);

	if (!mem->size || mem->size > xdna->dev_info->dev_heap_max_size) {
		XDNA_ERR(xdna, "Invalid dev bo size 0x%lx, max heap 0x%lx",
			 mem->size, xdna->dev_info->dev_heap_max_size);
		ret = -EINVAL;
		goto unlock_out;
	}

	align = 1 << max(PAGE_SHIFT, xdna->dev_info->dev_mem_buf_shift);
	ret = drm_mm_insert_node_generic(&client->dev_heap_mm,
					 &abo->mm_node,
					 mem->size, align,
					 0, DRM_MM_INSERT_BEST);
	if (ret) {
		XDNA_ERR(xdna, "Failed to alloc dev bo memory, ret %d", ret);
		goto unlock_out;
	}

	ret = amdxdna_init_dev_bo(abo);
	if (ret) {
		drm_mm_remove_node(&abo->mm_node);
		goto unlock_out;
	}

	client->heap_usage += mem->size;
	xa_for_each_range(&client->dev_heap_xa, heap_id, heap,
			  abo->heap_start_id, abo->heap_end_id)
		drm_gem_object_get(to_gobj(heap));

unlock_out:
	mutex_unlock(&client->mm_lock);

	return ret;
}

static void
amdxdna_gem_heap_free(struct amdxdna_gem_obj *abo)
{
	struct amdxdna_client *client = abo->client;
	struct amdxdna_gem_obj *heap;
	unsigned long heap_id;

	mutex_lock(&client->mm_lock);

	drm_mm_remove_node(&abo->mm_node);
	client->heap_usage -= abo->mem.size;

	xa_for_each_range(&client->dev_heap_xa, heap_id, heap,
			  abo->heap_start_id, abo->heap_end_id)
		drm_gem_object_put(to_gobj(heap));

	mutex_unlock(&client->mm_lock);
}

static struct amdxdna_gem_obj *
amdxdna_gem_create_obj(struct drm_device *dev, size_t size)
{
	struct amdxdna_gem_obj *abo;

	abo = kzalloc_obj(*abo);
	if (!abo)
		return ERR_PTR(-ENOMEM);

	abo->pinned = false;
	abo->assigned_hwctx = AMDXDNA_INVALID_CTX_HANDLE;
	mutex_init(&abo->lock);

	abo->mem.dma_addr = AMDXDNA_INVALID_ADDR;
	abo->mem.uva = AMDXDNA_INVALID_ADDR;
	abo->mem.size = size;
	abo->open_ref = 0;
	abo->internal = false;
	INIT_LIST_HEAD(&abo->mem.umap_list);

	return abo;
}

static void
amdxdna_gem_destroy_obj(struct amdxdna_gem_obj *abo)
{
	mutex_destroy(&abo->lock);
	kfree(abo);
}

/*
 * Obtains a kernel virtual address on the BO (usually of small size).
 * The mapping is established on the first call and stays valid until
 * amdxdna_gem_vunmap() is called.
 */
void *amdxdna_gem_vmap(struct amdxdna_gem_obj *abo)
{
	struct amdxdna_dev *xdna = to_xdna_dev(to_gobj(abo)->dev);
	struct iosys_map map = IOSYS_MAP_INIT_VADDR(NULL);
	int ret;

	if (abo->mem.kva)
		return abo->mem.kva;

	/* The first call to get the kva, taking slow path. */
	guard(mutex)(&abo->lock);

	if (!abo->mem.kva) {
		ret = drm_gem_vmap(to_gobj(abo), &map);
		if (ret)
			XDNA_ERR(xdna, "Vmap bo failed, ret %d", ret);
		else
			abo->mem.kva = map.vaddr;
	}
	return abo->mem.kva;
}

/*
 * Free mapping established through amdxdna_gem_vmap()
 */
static void amdxdna_gem_vunmap(struct amdxdna_gem_obj *abo)
{
	guard(mutex)(&abo->lock);

	if (abo->mem.kva) {
		struct iosys_map map = IOSYS_MAP_INIT_VADDR(abo->mem.kva);

		drm_gem_vunmap(to_gobj(abo), &map);
		abo->mem.kva = NULL;
	}
}

/*
 * Obtain the address for device to access the BO.
 */
u64 amdxdna_gem_dev_addr(struct amdxdna_gem_obj *abo)
{
	if (abo->type == AMDXDNA_BO_DEV_HEAP)
		return abo->dev_addr;
	if (abo->type == AMDXDNA_BO_DEV)
		return abo->mm_node.start;
	return amdxdna_obj_dma_addr(abo);
}

static bool amdxdna_hmm_invalidate(struct mmu_interval_notifier *mni,
				   const struct mmu_notifier_range *range,
				   unsigned long cur_seq)
{
	struct amdxdna_umap *mapp = container_of(mni, struct amdxdna_umap, notifier);
	struct amdxdna_gem_obj *abo = mapp->abo;
	struct amdxdna_dev *xdna;

	xdna = to_xdna_dev(to_gobj(abo)->dev);
	XDNA_DBG(xdna, "Invalidating range 0x%lx, 0x%lx, type %d",
		 mapp->range.start, mapp->range.end, abo->type);

	if (!mmu_notifier_range_blockable(range))
		return false;

	down_write(&xdna->notifier_lock);
	abo->mem.map_invalid = true;
	mapp->invalid = true;
	mmu_interval_set_seq(&mapp->notifier, cur_seq);
	up_write(&xdna->notifier_lock);

	if (xdna->dev_info->ops->hmm_invalidate)
		xdna->dev_info->ops->hmm_invalidate(abo, cur_seq);

	if (range->event == MMU_NOTIFY_UNMAP) {
		down_write(&xdna->notifier_lock);
		if (!mapp->unmapped) {
			queue_work(xdna->notifier_wq, &mapp->hmm_unreg_work);
			mapp->unmapped = true;
		}
		up_write(&xdna->notifier_lock);
	}

	return true;
}

static const struct mmu_interval_notifier_ops amdxdna_hmm_ops = {
	.invalidate = amdxdna_hmm_invalidate,
};

static inline bool compare_range(struct amdxdna_umap *mapp,
				 struct mm_struct *mm,
				 unsigned long start, unsigned long end)
{
	return (!mapp->unmapped && mapp->notifier.mm == mm &&
		mapp->range.start == start && mapp->range.end == end);
}

static void amdxdna_hmm_unregister(struct amdxdna_gem_obj *abo,
				   struct vm_area_struct *vma)
{
	struct amdxdna_dev *xdna = to_xdna_dev(to_gobj(abo)->dev);
	struct amdxdna_umap *mapp;

	down_write(&xdna->notifier_lock);
	list_for_each_entry(mapp, &abo->mem.umap_list, node) {
		if (!vma || compare_range(mapp, vma->vm_mm, vma->vm_start, vma->vm_end)) {
			if (!mapp->unmapped) {
				queue_work(xdna->notifier_wq, &mapp->hmm_unreg_work);
				mapp->unmapped = true;
			}
			if (vma)
				break;
		}
	}
	up_write(&xdna->notifier_lock);
}

static void amdxdna_umap_release(struct kref *ref)
{
	struct amdxdna_umap *mapp = container_of(ref, struct amdxdna_umap, refcnt);
	struct amdxdna_gem_obj *abo = mapp->abo;
	struct amdxdna_dev *xdna;

	mmu_interval_notifier_remove(&mapp->notifier);

	xdna = to_xdna_dev(to_gobj(mapp->abo)->dev);
	down_write(&xdna->notifier_lock);
	list_del(&mapp->node);
	if (list_empty(&abo->mem.umap_list))
		abo->mem.uva = AMDXDNA_INVALID_ADDR;
	up_write(&xdna->notifier_lock);

	kvfree(mapp->range.hmm_pfns);
	kfree(mapp);
}

void amdxdna_umap_put(struct amdxdna_umap *mapp)
{
	kref_put(&mapp->refcnt, amdxdna_umap_release);
}

static void amdxdna_hmm_unreg_work(struct work_struct *work)
{
	struct amdxdna_umap *mapp = container_of(work, struct amdxdna_umap,
						 hmm_unreg_work);

	amdxdna_umap_put(mapp);
}

static int amdxdna_hmm_register(struct amdxdna_gem_obj *abo,
				struct vm_area_struct *vma)
{
	struct amdxdna_dev *xdna = to_xdna_dev(to_gobj(abo)->dev);
	unsigned long len = vma->vm_end - vma->vm_start;
	unsigned long addr = vma->vm_start;
	struct amdxdna_umap *mapp;
	unsigned long nr_pages;
	int ret;

	/*
	 * When PASID is off, amdxdna_gem_obj_open() called amdxdna_dma_map_bo()
	 * and mem.dma_addr is valid; use the DMA address directly and skip HMM.
	 * Avoid dereferencing abo->client which may be NULL (cleared in close())
	 * while internal kernel references are still held.
	 */
	if (abo->mem.dma_addr != AMDXDNA_INVALID_ADDR) {
		/* Need to set uva for heap uva validation */
		abo->mem.uva = addr;
		return 0;
	}

	down_read(&xdna->notifier_lock);
	list_for_each_entry(mapp, &abo->mem.umap_list, node) {
		if (compare_range(mapp, current->mm, addr, addr + len)) {
			up_read(&xdna->notifier_lock);
			return 0;
		}
	}
	up_read(&xdna->notifier_lock);

	mapp = kzalloc_obj(*mapp);
	if (!mapp)
		return -ENOMEM;

	nr_pages = (PAGE_ALIGN(addr + len) - (addr & PAGE_MASK)) >> PAGE_SHIFT;
	mapp->range.hmm_pfns = kvzalloc_objs(*mapp->range.hmm_pfns, nr_pages);
	if (!mapp->range.hmm_pfns) {
		ret = -ENOMEM;
		goto free_map;
	}

	ret = mmu_interval_notifier_insert_locked(&mapp->notifier,
						  current->mm,
						  addr,
						  len,
						  &amdxdna_hmm_ops);
	if (ret) {
		XDNA_ERR(xdna, "Insert mmu notifier failed, ret %d", ret);
		goto free_pfns;
	}

	mapp->range.notifier = &mapp->notifier;
	mapp->range.start = vma->vm_start;
	mapp->range.end = vma->vm_end;
	mapp->range.default_flags = HMM_PFN_REQ_FAULT;
	mapp->abo = abo;
	kref_init(&mapp->refcnt);

	INIT_WORK(&mapp->hmm_unreg_work, amdxdna_hmm_unreg_work);

	down_write(&xdna->notifier_lock);
	if (list_empty(&abo->mem.umap_list))
		abo->mem.uva = addr;
	list_add_tail(&mapp->node, &abo->mem.umap_list);
	up_write(&xdna->notifier_lock);

	return 0;

free_pfns:
	kvfree(mapp->range.hmm_pfns);
free_map:
	kfree(mapp);
	return ret;
}

static void amdxdna_gem_dev_obj_free(struct drm_gem_object *gobj)
{
	struct amdxdna_dev *xdna = to_xdna_dev(gobj->dev);
	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);

	XDNA_DBG(xdna, "BO type %d xdna_addr 0x%llx", abo->type, amdxdna_gem_dev_addr(abo));
	if (abo->pinned)
		amdxdna_gem_unpin(abo);

	amdxdna_gem_vunmap(abo);
	amdxdna_gem_heap_free(abo);
	drm_gem_object_release(gobj);
	amdxdna_gem_destroy_obj(abo);
}

static void amdxdna_mark_mapp_invalid(struct amdxdna_gem_obj *abo,
				      struct vm_area_struct *vma)
{
	struct amdxdna_dev *xdna = to_xdna_dev(to_gobj(abo)->dev);
	struct amdxdna_umap *mapp;

	down_write(&xdna->notifier_lock);
	abo->mem.map_invalid = true;
	list_for_each_entry(mapp, &abo->mem.umap_list, node) {
		if (compare_range(mapp, vma->vm_mm, vma->vm_start, vma->vm_end)) {
			mapp->invalid = true;
			break;
		}
	}
	up_write(&xdna->notifier_lock);
}

static int amdxdna_insert_pages(struct amdxdna_gem_obj *abo,
				struct vm_area_struct *vma)
{
	struct amdxdna_dev *xdna = to_xdna_dev(to_gobj(abo)->dev);
	unsigned long num_pages = vma_pages(vma);
	unsigned long offset = 0;
	int ret;

	if (!is_import_bo(abo)) {
		ret = drm_gem_shmem_mmap(&abo->base, vma);
		if (ret) {
			XDNA_ERR(xdna, "Failed shmem mmap %d", ret);
			return ret;
		}
	} else {
		vma->vm_private_data = NULL;
		vma->vm_ops = NULL;
		ret = dma_buf_mmap(abo->dma_buf, vma, 0);
		if (ret) {
			XDNA_ERR(xdna, "Failed to mmap dma buf %d", ret);
			return ret;
		}

		/* Drop the reference drm_gem_mmap_obj() acquired.*/
		drm_gem_object_put(to_gobj(abo));
	}

	do {
		vm_fault_t fault_ret;

		fault_ret = handle_mm_fault(vma, vma->vm_start + offset,
					    FAULT_FLAG_WRITE, NULL);
		if (fault_ret & VM_FAULT_ERROR) {
			XDNA_ERR(xdna, "Fault in page failed");
			amdxdna_mark_mapp_invalid(abo, vma);
			break;
		}

		offset += PAGE_SIZE;
	} while (--num_pages);

	return 0;
}

static int amdxdna_gem_obj_mmap(struct drm_gem_object *gobj,
				struct vm_area_struct *vma)
{
	struct amdxdna_dev *xdna = to_xdna_dev(gobj->dev);
	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);
	int ret;

	ret = amdxdna_hmm_register(abo, vma);
	if (ret)
		return ret;

	ret = amdxdna_insert_pages(abo, vma);
	if (ret) {
		XDNA_ERR(xdna, "Failed insert pages, ret %d", ret);
		goto hmm_unreg;
	}

	XDNA_DBG(xdna, "BO map_offset 0x%llx type %d userptr 0x%lx size 0x%lx",
		 drm_vma_node_offset_addr(&gobj->vma_node), abo->type,
		 vma->vm_start, gobj->size);
	return 0;

hmm_unreg:
	amdxdna_hmm_unregister(abo, vma);
	return ret;
}

static int amdxdna_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
{
	struct drm_gem_object *gobj = dma_buf->priv;
	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);
	unsigned long num_pages = vma_pages(vma);
	int ret;

	vma->vm_ops = &drm_gem_shmem_vm_ops;
	vma->vm_private_data = gobj;

	drm_gem_object_get(gobj);
	ret = drm_gem_shmem_mmap(&abo->base, vma);
	if (ret)
		goto put_obj;

	/* The buffer is based on memory pages. Fix the flag. */
	vm_flags_mod(vma, VM_MIXEDMAP, VM_PFNMAP);
	ret = vm_insert_pages(vma, vma->vm_start, abo->base.pages,
			      &num_pages);
	if (ret)
		goto close_vma;

	return 0;

close_vma:
	vma->vm_ops->close(vma);
	return ret;
put_obj:
	drm_gem_object_put(gobj);
	return ret;
}

static const struct dma_buf_ops amdxdna_dmabuf_ops = {
	.attach = drm_gem_map_attach,
	.detach = drm_gem_map_detach,
	.map_dma_buf = drm_gem_map_dma_buf,
	.unmap_dma_buf = drm_gem_unmap_dma_buf,
	.release = drm_gem_dmabuf_release,
	.mmap = amdxdna_gem_dmabuf_mmap,
	.vmap = drm_gem_dmabuf_vmap,
	.vunmap = drm_gem_dmabuf_vunmap,
};

static struct dma_buf *amdxdna_gem_prime_export(struct drm_gem_object *gobj, int flags)
{
	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);
	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);

	if (abo->private_buffer)
		return ERR_PTR(-EOPNOTSUPP);

	if (abo->dma_buf) {
		get_dma_buf(abo->dma_buf);
		return abo->dma_buf;
	}

	exp_info.ops = &amdxdna_dmabuf_ops;
	exp_info.size = gobj->size;
	exp_info.flags = flags;
	exp_info.priv = gobj;
	exp_info.resv = gobj->resv;

	return drm_gem_dmabuf_export(gobj->dev, &exp_info);
}

static void amdxdna_imported_obj_free(struct amdxdna_gem_obj *abo)
{
	dma_buf_unmap_attachment_unlocked(abo->attach, abo->base.sgt, DMA_BIDIRECTIONAL);
	dma_buf_detach(abo->dma_buf, abo->attach);
	dma_buf_put(abo->dma_buf);
	drm_gem_object_release(to_gobj(abo));
	kfree(abo);
}

static inline bool
amdxdna_gem_skip_bo_usage(struct amdxdna_gem_obj *abo)
{
	/* Already counted as part of HEAP BO */
	if (abo->type == AMDXDNA_BO_DEV)
		return true;

	return false;
}

static void
amdxdna_gem_add_bo_usage(struct amdxdna_gem_obj *abo)
{
	struct amdxdna_client *client = abo->client;

	if (amdxdna_gem_skip_bo_usage(abo))
		return;

	guard(mutex)(&client->mm_lock);

	client->total_bo_usage += abo->mem.size;
	if (abo->internal)
		client->total_int_bo_usage += abo->mem.size;
}

static void
amdxdna_gem_del_bo_usage(struct amdxdna_gem_obj *abo)
{
	struct amdxdna_client *client = abo->client;

	if (amdxdna_gem_skip_bo_usage(abo))
		return;

	guard(mutex)(&client->mm_lock);

	client->total_bo_usage -= abo->mem.size;
	if (abo->internal)
		client->total_int_bo_usage -= abo->mem.size;
}

static void amdxdna_gem_obj_free(struct drm_gem_object *gobj)
{
	struct amdxdna_dev *xdna = to_xdna_dev(gobj->dev);
	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);

	amdxdna_hmm_unregister(abo, NULL);
	flush_workqueue(xdna->notifier_wq);

	if (abo->pinned)
		amdxdna_gem_unpin(abo);

	amdxdna_dma_unmap_bo(xdna, abo);
	amdxdna_gem_vunmap(abo);
	mutex_destroy(&abo->lock);

	if (is_import_bo(abo))
		amdxdna_imported_obj_free(abo);
	else
		drm_gem_shmem_free(&abo->base);
}

static int amdxdna_gem_obj_open(struct drm_gem_object *gobj, struct drm_file *filp)
{
	struct amdxdna_dev *xdna = to_xdna_dev(gobj->dev);
	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);
	int ret;

	guard(mutex)(&abo->lock);
	abo->open_ref++;
	if (abo->open_ref > 1)
		return 0;

	/* Attached to the client when first opened by it. */
	abo->client = filp->driver_priv;

	/* No need to set up dma addr mapping in PASID mode. */
	if (!amdxdna_pasid_on(abo->client)) {
		ret = amdxdna_dma_map_bo(xdna, abo);
		if (ret) {
			abo->open_ref--;
			abo->client = NULL;
			return ret;
		}
	}

	amdxdna_gem_add_bo_usage(abo);
	return 0;
}

static void amdxdna_gem_obj_close(struct drm_gem_object *gobj, struct drm_file *filp)
{
	struct amdxdna_gem_obj *abo = to_xdna_obj(gobj);

	guard(mutex)(&abo->lock);
	abo->open_ref--;

	if (abo->open_ref == 0) {
		amdxdna_gem_del_bo_usage(abo);
		/* Detach from the client when last closed by it. */
		abo->client = NULL;
	}
}

static int amdxdna_gem_obj_vmap(struct drm_gem_object *obj, struct iosys_map *map)
{
	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);
	int ret;

	iosys_map_clear(map);

	dma_resv_assert_held(obj->resv);

	if (is_import_bo(abo))
		ret = dma_buf_vmap(abo->dma_buf, map);
	else
		ret = drm_gem_shmem_object_vmap(obj, map);
	if (ret)
		return ret;
	if (!map->vaddr)
		return -ENOMEM;

	return 0;
}

static void amdxdna_gem_obj_vunmap(struct drm_gem_object *obj, struct iosys_map *map)
{
	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);

	dma_resv_assert_held(obj->resv);

	if (is_import_bo(abo))
		dma_buf_vunmap(abo->dma_buf, map);
	else
		drm_gem_shmem_object_vunmap(obj, map);
}

static int amdxdna_gem_dev_obj_vmap(struct drm_gem_object *obj, struct iosys_map *map)
{
	struct amdxdna_gem_obj *abo = to_xdna_obj(obj);
	struct amdxdna_gem_obj *heap;
	void *base;
	u64 offset;

	/* vmap dev bo which is across more than 1 heap is not allowed */
	if (abo->heap_start_id != abo->heap_end_id)
		return -ENOMEM;

	heap = xa_load(&abo->client->dev_heap_xa, abo->heap_start_id);
	if (!heap)
		return -ENOMEM;

	base = amdxdna_gem_vmap(heap);
	if (!base)
		return -ENOMEM;

	offset = amdxdna_gem_dev_addr(abo) - amdxdna_gem_dev_addr(heap);
	iosys_map_set_vaddr(map, base + offset);
	return 0;
}

static struct dma_buf *amdxdna_gem_dev_obj_export(struct drm_gem_object *gobj, int flags)
{
	return ERR_PTR(-EOPNOTSUPP);
}

static const struct drm_gem_object_funcs amdxdna_gem_dev_obj_funcs = {
	.free = amdxdna_gem_dev_obj_free,
	.vmap = amdxdna_gem_dev_obj_vmap,
	.export = amdxdna_gem_dev_obj_export,
};

static const struct drm_gem_object_funcs amdxdna_gem_shmem_funcs = {
	.free = amdxdna_gem_obj_free,
	.open = amdxdna_gem_obj_open,
	.close = amdxdna_gem_obj_close,
	.print_info = drm_gem_shmem_object_print_info,
	.pin = drm_gem_shmem_object_pin,
	.unpin = drm_gem_shmem_object_unpin,
	.get_sg_table = drm_gem_shmem_object_get_sg_table,
	.vmap = amdxdna_gem_obj_vmap,
	.vunmap = amdxdna_gem_obj_vunmap,
	.mmap = amdxdna_gem_obj_mmap,
	.vm_ops = &drm_gem_shmem_vm_ops,
	.export = amdxdna_gem_prime_export,
};

/* For drm_driver->gem_create_object callback */
struct drm_gem_object *
amdxdna_gem_create_shmem_object_cb(struct drm_device *dev, size_t size)
{
	struct amdxdna_gem_obj *abo;

	abo = amdxdna_gem_create_obj(dev, size);
	if (IS_ERR(abo))
		return ERR_CAST(abo);

	to_gobj(abo)->funcs = &amdxdna_gem_shmem_funcs;

	return to_gobj(abo);
}

static struct amdxdna_gem_obj *
amdxdna_gem_create_shmem_object(struct drm_device *dev, struct amdxdna_drm_create_bo *args)
{
	size_t size = args->size;
	struct drm_gem_shmem_object *shmem = drm_gem_shmem_create(dev, size);

	if (IS_ERR(shmem))
		return ERR_CAST(shmem);

	shmem->map_wc = false;
	return to_xdna_obj(&shmem->base);
}

static struct amdxdna_gem_obj *
amdxdna_gem_create_ubuf_object(struct drm_device *dev, struct amdxdna_drm_create_bo *args)
{
	struct amdxdna_dev *xdna = to_xdna_dev(dev);
	struct amdxdna_drm_va_tbl va_tbl;
	struct amdxdna_gem_obj *abo;
	struct drm_gem_object *gobj;
	struct dma_buf *dma_buf;

	if (copy_from_user(&va_tbl, u64_to_user_ptr(args->vaddr), sizeof(va_tbl))) {
		XDNA_DBG(xdna, "Access va table failed");
		return ERR_PTR(-EINVAL);
	}

	if (va_tbl.num_entries) {
		dma_buf = amdxdna_get_ubuf(dev, va_tbl.num_entries,
					   u64_to_user_ptr(args->vaddr + sizeof(va_tbl)));
	} else {
		dma_buf = dma_buf_get(va_tbl.dmabuf_fd);
	}

	if (IS_ERR(dma_buf))
		return ERR_CAST(dma_buf);

	gobj = amdxdna_gem_prime_import(dev, dma_buf);
	if (IS_ERR(gobj)) {
		dma_buf_put(dma_buf);
		return ERR_CAST(gobj);
	}

	dma_buf_put(dma_buf);

	abo = to_xdna_obj(gobj);
	abo->private_buffer = true;

	return abo;
}

static struct amdxdna_gem_obj *
amdxdna_gem_create_cbuf_object(struct drm_device *dev, struct amdxdna_drm_create_bo *args)
{
	struct amdxdna_dev *xdna = to_xdna_dev(dev);
	size_t size = PAGE_ALIGN(args->size);
	struct drm_gem_object *gobj;
	struct amdxdna_gem_obj *ret;
	struct dma_buf *dma_buf;
	u64 align;

	if (!size) {
		XDNA_ERR(xdna, "Invalid BO size 0x%llx", args->size);
		return ERR_PTR(-EINVAL);
	}

	align = (args->type == AMDXDNA_BO_DEV_HEAP) ?  xdna->dev_info->dev_mem_size : 0;
	dma_buf = amdxdna_get_cbuf(dev, size, align);
	if (IS_ERR(dma_buf))
		return ERR_CAST(dma_buf);

	gobj = amdxdna_gem_prime_import(dev, dma_buf);
	if (IS_ERR(gobj))
		ret = ERR_CAST(gobj);
	else
		ret = to_xdna_obj(gobj);

	dma_buf_put(dma_buf);
	return ret;
}

struct drm_gem_object *
amdxdna_gem_prime_import(struct drm_device *dev, struct dma_buf *dma_buf)
{
	struct dma_buf_attachment *attach;
	struct amdxdna_gem_obj *abo;
	struct drm_gem_object *gobj;
	struct sg_table *sgt;
	int ret;

	get_dma_buf(dma_buf);

	attach = dma_buf_attach(dma_buf, dev->dev);
	if (IS_ERR(attach)) {
		ret = PTR_ERR(attach);
		goto put_buf;
	}

	sgt = dma_buf_map_attachment_unlocked(attach, DMA_BIDIRECTIONAL);
	if (IS_ERR(sgt)) {
		ret = PTR_ERR(sgt);
		goto fail_detach;
	}

	gobj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt);
	if (IS_ERR(gobj)) {
		ret = PTR_ERR(gobj);
		goto fail_unmap;
	}

	abo = to_xdna_obj(gobj);
	abo->attach = attach;
	abo->dma_buf = dma_buf;
	abo->type = AMDXDNA_BO_SHARE;
	gobj->resv = dma_buf->resv;

	return gobj;

fail_unmap:
	dma_buf_unmap_attachment_unlocked(attach, sgt, DMA_BIDIRECTIONAL);
fail_detach:
	dma_buf_detach(dma_buf, attach);
put_buf:
	dma_buf_put(dma_buf);

	return ERR_PTR(ret);
}

static struct amdxdna_gem_obj *
amdxdna_drm_create_share_bo(struct drm_device *dev,
			    struct amdxdna_drm_create_bo *args, struct drm_file *filp)
{
	struct amdxdna_gem_obj *abo;

	if (args->vaddr)
		abo = amdxdna_gem_create_ubuf_object(dev, args);
	else if (amdxdna_use_carveout(to_xdna_dev(dev)))
		abo = amdxdna_gem_create_cbuf_object(dev, args);
	else
		abo = amdxdna_gem_create_shmem_object(dev, args);
	if (IS_ERR(abo))
		return ERR_CAST(abo);

	if (args->type == AMDXDNA_BO_DEV_HEAP) {
		abo->type = AMDXDNA_BO_DEV_HEAP;
		abo->internal = true;
	} else {
		abo->type = AMDXDNA_BO_SHARE;
		abo->internal = args->type == AMDXDNA_BO_CMD;
	}

	return abo;
}

static struct amdxdna_gem_obj *
amdxdna_drm_create_dev_heap_bo(struct drm_device *dev,
			       struct amdxdna_drm_create_bo *args, struct drm_file *filp)
{
	struct amdxdna_client *client = filp->driver_priv;
	struct amdxdna_dev *xdna = to_xdna_dev(dev);
	struct amdxdna_gem_obj *abo;
	int ret;

	WARN_ON(!is_power_of_2(xdna->dev_info->dev_mem_size));
	XDNA_DBG(xdna, "Requested dev heap size 0x%llx", args->size);
	if (!args->size || !IS_ALIGNED(args->size, xdna->dev_info->dev_mem_size)) {
		XDNA_ERR(xdna, "The dev heap size 0x%llx is not multiple of 0x%lx",
			 args->size, xdna->dev_info->dev_mem_size);
		return ERR_PTR(-EINVAL);
	}

	/* HEAP BO is a special case of SHARE BO. */
	abo = amdxdna_drm_create_share_bo(dev, args, filp);
	if (IS_ERR(abo))
		return ERR_CAST(abo);

	/* Set up heap for this client. */
	mutex_lock(&client->mm_lock);

	if (!xdna->dev_info->ops->hwctx_heap_expand &&
	    client->dev_heap_nid > 0) {
		XDNA_ERR(xdna, "Heap expansion is not supported");
		ret = -EOPNOTSUPP;
		goto mm_unlock;
	}

	if (client->total_heap_size + abo->mem.size >
	    xdna->dev_info->dev_heap_max_size) {
		XDNA_ERR(xdna, "Heap size 0x%lx + 0x%lx exceeds max 0x%lx",
			 client->total_heap_size, abo->mem.size,
			 xdna->dev_info->dev_heap_max_size);
		ret = -ENOSPC;
		goto mm_unlock;
	}

	ret = xa_insert(&client->dev_heap_xa, client->dev_heap_nid, abo, GFP_KERNEL);
	if (ret) {
		XDNA_ERR(xdna, "Add heap failed %d", ret);
		goto mm_unlock;
	}

	abo->dev_addr = xdna->dev_info->dev_mem_base + client->total_heap_size;
	client->total_heap_size += abo->mem.size;
	client->dev_heap_nid++;
	drm_gem_object_get(to_gobj(abo));

	mutex_unlock(&client->mm_lock);

	return abo;

mm_unlock:
	mutex_unlock(&client->mm_lock);
	drm_gem_object_put(to_gobj(abo));
	return ERR_PTR(ret);
}

struct amdxdna_gem_obj *
amdxdna_drm_create_dev_bo(struct drm_device *dev,
			  struct amdxdna_drm_create_bo *args, struct drm_file *filp)
{
	size_t aligned_sz = PAGE_ALIGN(args->size);
	struct amdxdna_client *client = filp->driver_priv;
	struct amdxdna_dev *xdna = to_xdna_dev(dev);
	struct amdxdna_gem_obj *abo;
	struct drm_gem_object *gobj;
	int ret;

	if (!aligned_sz) {
		XDNA_ERR(xdna, "Invalid BO size 0x%llx", args->size);
		return ERR_PTR(-EINVAL);
	}

	abo = amdxdna_gem_create_obj(dev, aligned_sz);
	if (IS_ERR(abo))
		return abo;
	gobj = to_gobj(abo);
	gobj->funcs = &amdxdna_gem_dev_obj_funcs;
	abo->type = AMDXDNA_BO_DEV;
	abo->internal = true;
	/*
	 * DEV BOs cannot be alive when client is gone, it's OK to
	 * always establish the connection.
	 */
	abo->client = client;

	ret = amdxdna_gem_heap_alloc(abo);
	if (ret) {
		amdxdna_gem_destroy_obj(abo);
		return ERR_PTR(ret);
	}

	drm_gem_private_object_init(dev, gobj, aligned_sz);

	return abo;
}

int amdxdna_drm_create_bo_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
{
	struct amdxdna_client *client = filp->driver_priv;
	struct amdxdna_dev *xdna = to_xdna_dev(dev);
	struct amdxdna_drm_create_bo *args = data;
	struct amdxdna_gem_obj *abo;
	int ret;

	if (args->flags)
		return -EINVAL;

	XDNA_DBG(xdna, "BO arg type %d vaddr 0x%llx size 0x%llx flags 0x%llx",
		 args->type, args->vaddr, args->size, args->flags);
	switch (args->type) {
	case AMDXDNA_BO_CMD:
	case AMDXDNA_BO_SHARE:
		abo = amdxdna_drm_create_share_bo(dev, args, filp);
		break;
	case AMDXDNA_BO_DEV_HEAP:
		abo = amdxdna_drm_create_dev_heap_bo(dev, args, filp);
		break;
	case AMDXDNA_BO_DEV:
		abo = amdxdna_drm_create_dev_bo(dev, args, filp);
		if (!IS_ERR(abo)) {
			mutex_lock(&xdna->dev_lock);
			ret = amdxdna_update_heap(client, NULL);
			mutex_unlock(&xdna->dev_lock);
			if (ret)
				goto put_obj;
		}
		break;
	default:
		return -EINVAL;
	}
	if (IS_ERR(abo))
		return PTR_ERR(abo);

	/* Ready to publish object to userspace and count for BO usage. */
	ret = drm_gem_handle_create(filp, to_gobj(abo), &args->handle);
	if (ret) {
		XDNA_ERR(xdna, "Create handle failed");
		goto put_obj;
	}

	XDNA_DBG(xdna, "BO hdl %d type %d userptr 0x%llx xdna_addr 0x%llx size 0x%lx",
		 args->handle, args->type, amdxdna_gem_uva(abo),
		 amdxdna_gem_dev_addr(abo), abo->mem.size);
put_obj:
	/* Dereference object reference. Handle holds it now. */
	drm_gem_object_put(to_gobj(abo));
	return ret;
}

static int amdxdna_bo_pin(struct amdxdna_gem_obj *abo)
{
	struct amdxdna_dev *xdna = to_xdna_dev(to_gobj(abo)->dev);
	int ret;

	if (is_import_bo(abo))
		return 0;

	ret = drm_gem_shmem_pin(&abo->base);

	XDNA_DBG(xdna, "BO type %d ret %d", abo->type, ret);
	return ret;
}

static void amdxdna_bo_unpin(struct amdxdna_gem_obj *abo)
{
	struct amdxdna_dev *xdna = to_xdna_dev(to_gobj(abo)->dev);

	if (is_import_bo(abo))
		return;

	drm_gem_shmem_unpin(&abo->base);

	XDNA_DBG(xdna, "BO type %d", abo->type);
}

int amdxdna_gem_pin_nolock(struct amdxdna_gem_obj *abo)
{
	struct amdxdna_client *client = abo->client;
	struct amdxdna_gem_obj *heap;
	unsigned long heap_id, last = ULONG_MAX;
	int ret = 0;

	if (abo->type != AMDXDNA_BO_DEV)
		return amdxdna_bo_pin(abo);

	xa_for_each_range(&client->dev_heap_xa, heap_id, heap,
			  abo->heap_start_id, abo->heap_end_id) {
		ret = amdxdna_bo_pin(heap);
		if (ret)
			break;
		last = heap_id;
	}

	if (ret && last <= abo->heap_end_id) {
		xa_for_each_range(&client->dev_heap_xa, heap_id, heap,
				  abo->heap_start_id, last)
			amdxdna_bo_unpin(heap);
	}

	return ret;
}

int amdxdna_gem_pin(struct amdxdna_gem_obj *abo)
{
	int ret;

	mutex_lock(&abo->lock);
	ret = amdxdna_gem_pin_nolock(abo);
	mutex_unlock(&abo->lock);

	return ret;
}

void amdxdna_gem_unpin(struct amdxdna_gem_obj *abo)
{
	mutex_lock(&abo->lock);
	if (abo->type == AMDXDNA_BO_DEV) {
		struct amdxdna_gem_obj *heap;
		unsigned long heap_id;

		xa_for_each_range(&abo->client->dev_heap_xa, heap_id, heap,
				  abo->heap_start_id, abo->heap_end_id)
			amdxdna_bo_unpin(heap);
	} else {
		amdxdna_bo_unpin(abo);
	}

	mutex_unlock(&abo->lock);
}

struct amdxdna_gem_obj *amdxdna_gem_get_obj(struct amdxdna_client *client,
					    u32 bo_hdl, u8 bo_type)
{
	struct amdxdna_gem_obj *abo;
	struct drm_gem_object *gobj;

	gobj = drm_gem_object_lookup(client->filp, bo_hdl);
	if (!gobj) {
		XDNA_DBG(client->xdna, "Can not find bo %d", bo_hdl);
		return NULL;
	}

	abo = to_xdna_obj(gobj);
	if (bo_type == AMDXDNA_BO_INVALID || abo->type == bo_type)
		return abo;

	drm_gem_object_put(gobj);
	return NULL;
}

int amdxdna_drm_get_bo_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
{
	struct amdxdna_drm_get_bo_info *args = data;
	struct amdxdna_dev *xdna = to_xdna_dev(dev);
	struct amdxdna_gem_obj *abo;
	struct drm_gem_object *gobj;
	int ret = 0;

	if (args->ext || args->ext_flags || args->pad)
		return -EINVAL;

	gobj = drm_gem_object_lookup(filp, args->handle);
	if (!gobj) {
		XDNA_DBG(xdna, "Lookup GEM object %d failed", args->handle);
		return -ENOENT;
	}

	abo = to_xdna_obj(gobj);
	args->vaddr = amdxdna_gem_uva(abo);
	args->xdna_addr = amdxdna_gem_dev_addr(abo);

	if (abo->type != AMDXDNA_BO_DEV)
		args->map_offset = drm_vma_node_offset_addr(&gobj->vma_node);
	else
		args->map_offset = AMDXDNA_INVALID_ADDR;

	XDNA_DBG(xdna, "BO hdl %d map_offset 0x%llx vaddr 0x%llx xdna_addr 0x%llx",
		 args->handle, args->map_offset, args->vaddr, args->xdna_addr);

	drm_gem_object_put(gobj);
	return ret;
}

static int amdxdna_flush_bo(struct amdxdna_gem_obj *abo, u64 offset, u64 size)
{
	u64 end;

	if (offset >= abo->mem.size)
		return -EINVAL;

	if (check_add_overflow(offset, size, &end))
		return -EINVAL;

	size = min(abo->mem.size, end) - offset;
	if (is_import_bo(abo))
		drm_clflush_sg(abo->base.sgt);
	else if (amdxdna_gem_vmap(abo))
		drm_clflush_virt_range(amdxdna_gem_vmap(abo) + offset, size);
	else if (abo->base.pages)
		drm_clflush_pages(abo->base.pages, abo->mem.size >> PAGE_SHIFT);
	else
		return -EINVAL;

	return 0;
}

/*
 * The sync bo ioctl is to make sure the CPU cache is in sync with memory.
 * This is required because NPU is not cache coherent device. CPU cache
 * flushing/invalidation is expensive so it is best to handle this outside
 * of the command submission path. This ioctl allows explicit cache
 * flushing/invalidation outside of the critical path.
 */
int amdxdna_drm_sync_bo_ioctl(struct drm_device *dev,
			      void *data, struct drm_file *filp)
{
	struct amdxdna_client *client = filp->driver_priv;
	struct amdxdna_dev *xdna = to_xdna_dev(dev);
	struct amdxdna_drm_sync_bo *args = data;
	struct amdxdna_gem_obj *abo;
	struct drm_gem_object *gobj;
	int ret = 0;

	gobj = drm_gem_object_lookup(filp, args->handle);
	if (!gobj) {
		XDNA_ERR(xdna, "Lookup GEM object failed");
		return -ENOENT;
	}
	abo = to_xdna_obj(gobj);

	if (abo->type == AMDXDNA_BO_DEV) {
		struct amdxdna_gem_obj *heap;
		unsigned long heap_id;
		u64 bo_start = amdxdna_gem_dev_addr(abo);
		u64 flush_start = bo_start + args->offset;
		u64 flush_end = flush_start + args->size;

		xa_for_each_range(&client->dev_heap_xa, heap_id, heap,
				  abo->heap_start_id, abo->heap_end_id) {
			u64 heap_start = amdxdna_gem_dev_addr(heap);
			u64 heap_end = heap_start + heap->mem.size;
			u64 start = max(flush_start, heap_start);
			u64 end = min(flush_end, heap_end);

			if (start >= end)
				continue;

			ret = amdxdna_flush_bo(heap, start - heap_start, end - start);
			if (ret) {
				XDNA_ERR(xdna, "Failed to flush heap %ld ret %d",
					 heap_id, ret);
				goto put_obj;
			}
		}
	} else {
		ret = amdxdna_gem_pin(abo);
		if (ret) {
			XDNA_ERR(xdna, "Pin BO %d failed, ret %d", args->handle, ret);
			goto put_obj;
		}

		ret = amdxdna_flush_bo(abo, args->offset, args->size);
		amdxdna_gem_unpin(abo);

		if (ret) {
			drm_WARN(&xdna->ddev, 1, "Can not get flush memory");
			goto put_obj;
		}
	}

	XDNA_DBG(xdna, "Sync bo %d offset 0x%llx, size 0x%llx\n",
		 args->handle, args->offset, args->size);

	if (args->direction == SYNC_DIRECT_FROM_DEVICE)
		ret = amdxdna_hwctx_sync_debug_bo(client, args->handle);

put_obj:
	drm_gem_object_put(gobj);
	return ret;
}

int amdxdna_drm_get_bo_usage(struct drm_device *dev, struct amdxdna_drm_get_array *args)
{
	size_t min_sz = min(args->element_size, sizeof(struct amdxdna_drm_bo_usage));
	char __user *buf = u64_to_user_ptr(args->buffer);
	struct amdxdna_dev *xdna = to_xdna_dev(dev);
	struct amdxdna_client *tmp_client;
	struct amdxdna_drm_bo_usage tmp;

	drm_WARN_ON(dev, !mutex_is_locked(&xdna->dev_lock));

	if (args->num_element != 1)
		return -EINVAL;

	if (copy_from_user(&tmp, buf, min_sz))
		return -EFAULT;

	if (!tmp.pid)
		return -EINVAL;

	tmp.total_usage = 0;
	tmp.internal_usage = 0;
	tmp.heap_usage = 0;

	list_for_each_entry(tmp_client, &xdna->client_list, node) {
		if (tmp.pid != tmp_client->pid)
			continue;

		mutex_lock(&tmp_client->mm_lock);
		tmp.total_usage += tmp_client->total_bo_usage;
		tmp.internal_usage += tmp_client->total_int_bo_usage;
		tmp.heap_usage += tmp_client->heap_usage;
		mutex_unlock(&tmp_client->mm_lock);
	}

	if (copy_to_user(buf, &tmp, min_sz))
		return -EFAULT;

	return 0;
}