drivers/gpu/drm/etnaviv/etnaviv_mmu.c - linux-mtk - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2015-2018 Etnaviv Project
  */

 #include "common.xml.h"
 #include "etnaviv_cmdbuf.h"
 #include "etnaviv_drv.h"
 #include "etnaviv_gem.h"
 #include "etnaviv_gpu.h"
 #include "etnaviv_iommu.h"
 #include "etnaviv_mmu.h"

 static void etnaviv_domain_unmap(struct etnaviv_iommu_domain *domain,
 				 unsigned long iova, size_t size)
 {
 	size_t unmapped_page, unmapped = 0;
 	size_t pgsize = SZ_4K;

 	if (!IS_ALIGNED(iova | size, pgsize)) {
 		pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n",
 		       iova, size, pgsize);
 		return;
 	}

 	while (unmapped < size) {
 		unmapped_page = domain->ops->unmap(domain, iova, pgsize);
 		if (!unmapped_page)
 			break;

 		iova += unmapped_page;
 		unmapped += unmapped_page;
 	}
 }

 static int etnaviv_domain_map(struct etnaviv_iommu_domain *domain,
 			      unsigned long iova, phys_addr_t paddr,
 			      size_t size, int prot)
 {
 	unsigned long orig_iova = iova;
 	size_t pgsize = SZ_4K;
 	size_t orig_size = size;
 	int ret = 0;

 	if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
 		pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n",
 		       iova, &paddr, size, pgsize);
 		return -EINVAL;
 	}

 	while (size) {
 		ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
 		if (ret)
 			break;

 		iova += pgsize;
 		paddr += pgsize;
 		size -= pgsize;
 	}

 	/* unroll mapping in case something went wrong */
 	if (ret)
 		etnaviv_domain_unmap(domain, orig_iova, orig_size - size);

 	return ret;
 }

 static int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
 			     struct sg_table *sgt, unsigned len, int prot)
 {
 	struct etnaviv_iommu_domain *domain = iommu->domain;
 	struct scatterlist *sg;
 	unsigned int da = iova;
 	unsigned int i, j;
 	int ret;

 	if (!domain || !sgt)
 		return -EINVAL;

 	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
 		u32 pa = sg_dma_address(sg) - sg->offset;
 		size_t bytes = sg_dma_len(sg) + sg->offset;

 		VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);

 		ret = etnaviv_domain_map(domain, da, pa, bytes, prot);
 		if (ret)
 			goto fail;

 		da += bytes;
 	}

 	return 0;

 fail:
 	da = iova;

 	for_each_sg(sgt->sgl, sg, i, j) {
 		size_t bytes = sg_dma_len(sg) + sg->offset;

 		etnaviv_domain_unmap(domain, da, bytes);
 		da += bytes;
 	}
 	return ret;
 }

 static void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
 				struct sg_table *sgt, unsigned len)
 {
 	struct etnaviv_iommu_domain *domain = iommu->domain;
 	struct scatterlist *sg;
 	unsigned int da = iova;
 	int i;

 	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
 		size_t bytes = sg_dma_len(sg) + sg->offset;

 		etnaviv_domain_unmap(domain, da, bytes);

 		VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);

 		BUG_ON(!PAGE_ALIGNED(bytes));

 		da += bytes;
 	}
 }

 static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
 	struct etnaviv_vram_mapping *mapping)
 {
 	struct etnaviv_gem_object *etnaviv_obj = mapping->object;

 	etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
 			    etnaviv_obj->sgt, etnaviv_obj->base.size);
 	drm_mm_remove_node(&mapping->vram_node);
 }

 static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
 				   struct drm_mm_node *node, size_t size)
 {
 	struct etnaviv_vram_mapping *free = NULL;
 	enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
 	int ret;

 	lockdep_assert_held(&mmu->lock);

 	while (1) {
 		struct etnaviv_vram_mapping *m, *n;
 		struct drm_mm_scan scan;
 		struct list_head list;
 		bool found;

 		ret = drm_mm_insert_node_in_range(&mmu->mm, node,
 						  size, 0, 0, 0, U64_MAX, mode);
 		if (ret != -ENOSPC)
 			break;

 		/* Try to retire some entries */
 		drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);

 		found = 0;
 		INIT_LIST_HEAD(&list);
 		list_for_each_entry(free, &mmu->mappings, mmu_node) {
 			/* If this vram node has not been used, skip this. */
 			if (!free->vram_node.mm)
 				continue;

 			/*
 			 * If the iova is pinned, then it's in-use,
 			 * so we must keep its mapping.
 			 */
 			if (free->use)
 				continue;

 			list_add(&free->scan_node, &list);
 			if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
 				found = true;
 				break;
 			}
 		}

 		if (!found) {
 			/* Nothing found, clean up and fail */
 			list_for_each_entry_safe(m, n, &list, scan_node)
 				BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
 			break;
 		}

 		/*
 		 * drm_mm does not allow any other operations while
 		 * scanning, so we have to remove all blocks first.
 		 * If drm_mm_scan_remove_block() returns false, we
 		 * can leave the block pinned.
 		 */
 		list_for_each_entry_safe(m, n, &list, scan_node)
 			if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
 				list_del_init(&m->scan_node);

 		/*
 		 * Unmap the blocks which need to be reaped from the MMU.
 		 * Clear the mmu pointer to prevent the mapping_get finding
 		 * this mapping.
 		 */
 		list_for_each_entry_safe(m, n, &list, scan_node) {
 			etnaviv_iommu_remove_mapping(mmu, m);
 			m->mmu = NULL;
 			list_del_init(&m->mmu_node);
 			list_del_init(&m->scan_node);
 		}

 		mode = DRM_MM_INSERT_EVICT;

 		/*
 		 * We removed enough mappings so that the new allocation will
 		 * succeed, retry the allocation one more time.
 		 */
 	}

 	return ret;
 }

 int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
 	struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
 	struct etnaviv_vram_mapping *mapping)
 {
 	struct sg_table *sgt = etnaviv_obj->sgt;
 	struct drm_mm_node *node;
 	int ret;

 	lockdep_assert_held(&etnaviv_obj->lock);

 	mutex_lock(&mmu->lock);

 	/* v1 MMU can optimize single entry (contiguous) scatterlists */
 	if (mmu->version == ETNAVIV_IOMMU_V1 &&
 	    sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
 		u32 iova;

 		iova = sg_dma_address(sgt->sgl) - memory_base;
 		if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
 			mapping->iova = iova;
 			list_add_tail(&mapping->mmu_node, &mmu->mappings);
 			ret = 0;
 			goto unlock;
 		}
 	}

 	node = &mapping->vram_node;

 	ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
 	if (ret < 0)
 		goto unlock;

 	mapping->iova = node->start;
 	ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
 				ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);

 	if (ret < 0) {
 		drm_mm_remove_node(node);
 		goto unlock;
 	}

 	list_add_tail(&mapping->mmu_node, &mmu->mappings);
 	mmu->flush_seq++;
 unlock:
 	mutex_unlock(&mmu->lock);

 	return ret;
 }

 void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
 	struct etnaviv_vram_mapping *mapping)
 {
 	WARN_ON(mapping->use);

 	mutex_lock(&mmu->lock);

 	/* If the vram node is on the mm, unmap and remove the node */
 	if (mapping->vram_node.mm == &mmu->mm)
 		etnaviv_iommu_remove_mapping(mmu, mapping);

 	list_del(&mapping->mmu_node);
 	mmu->flush_seq++;
 	mutex_unlock(&mmu->lock);
 }

 void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
 {
 	drm_mm_takedown(&mmu->mm);
 	mmu->domain->ops->free(mmu->domain);
 	kfree(mmu);
 }

 struct etnaviv_iommu *etnaviv_iommu_new(struct etnaviv_gpu *gpu)
 {
 	enum etnaviv_iommu_version version;
 	struct etnaviv_iommu *mmu;

 	mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
 	if (!mmu)
 		return ERR_PTR(-ENOMEM);

 	if (!(gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)) {
 		mmu->domain = etnaviv_iommuv1_domain_alloc(gpu);
 		version = ETNAVIV_IOMMU_V1;
 	} else {
 		mmu->domain = etnaviv_iommuv2_domain_alloc(gpu);
 		version = ETNAVIV_IOMMU_V2;
 	}

 	if (!mmu->domain) {
 		dev_err(gpu->dev, "Failed to allocate GPU IOMMU domain\n");
 		kfree(mmu);
 		return ERR_PTR(-ENOMEM);
 	}

 	mmu->gpu = gpu;
 	mmu->version = version;
 	mutex_init(&mmu->lock);
 	INIT_LIST_HEAD(&mmu->mappings);

 	drm_mm_init(&mmu->mm, mmu->domain->base, mmu->domain->size);

 	return mmu;
 }

 void etnaviv_iommu_restore(struct etnaviv_gpu *gpu)
 {
 	if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
 		etnaviv_iommuv1_restore(gpu);
 	else
 		etnaviv_iommuv2_restore(gpu);
 }

 int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
 				  struct drm_mm_node *vram_node, size_t size,
 				  u32 *iova)
 {
 	struct etnaviv_iommu *mmu = gpu->mmu;

 	if (mmu->version == ETNAVIV_IOMMU_V1) {
 		*iova = paddr - gpu->memory_base;
 		return 0;
 	} else {
 		int ret;

 		mutex_lock(&mmu->lock);
 		ret = etnaviv_iommu_find_iova(mmu, vram_node, size);
 		if (ret < 0) {
 			mutex_unlock(&mmu->lock);
 			return ret;
 		}
 		ret = etnaviv_domain_map(mmu->domain, vram_node->start, paddr,
 					 size, ETNAVIV_PROT_READ);
 		if (ret < 0) {
 			drm_mm_remove_node(vram_node);
 			mutex_unlock(&mmu->lock);
 			return ret;
 		}
 		mmu->flush_seq++;
 		mutex_unlock(&mmu->lock);

 		*iova = (u32)vram_node->start;
 		return 0;
 	}
 }

 void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
 				   struct drm_mm_node *vram_node, size_t size,
 				   u32 iova)
 {
 	struct etnaviv_iommu *mmu = gpu->mmu;

 	if (mmu->version == ETNAVIV_IOMMU_V2) {
 		mutex_lock(&mmu->lock);
 		etnaviv_domain_unmap(mmu->domain, iova, size);
 		drm_mm_remove_node(vram_node);
 		mutex_unlock(&mmu->lock);
 	}
 }
 size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
 {
 	return iommu->domain->ops->dump_size(iommu->domain);
 }

 void etnaviv_iommu_dump(struct etnaviv_iommu *iommu, void *buf)
 {
 	iommu->domain->ops->dump(iommu->domain, buf);
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2015-2018 Etnaviv Project
	*/

	#include "common.xml.h"
	#include "etnaviv_cmdbuf.h"
	#include "etnaviv_drv.h"
	#include "etnaviv_gem.h"
	#include "etnaviv_gpu.h"
	#include "etnaviv_iommu.h"
	#include "etnaviv_mmu.h"

	static void etnaviv_domain_unmap(struct etnaviv_iommu_domain *domain,
	unsigned long iova, size_t size)
	{
	size_t unmapped_page, unmapped = 0;
	size_t pgsize = SZ_4K;

	if (!IS_ALIGNED(iova \| size, pgsize)) {
	pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%zx\n",
	iova, size, pgsize);
	return;
	}

	while (unmapped < size) {
	unmapped_page = domain->ops->unmap(domain, iova, pgsize);
	if (!unmapped_page)
	break;

	iova += unmapped_page;
	unmapped += unmapped_page;
	}
	}

	static int etnaviv_domain_map(struct etnaviv_iommu_domain *domain,
	unsigned long iova, phys_addr_t paddr,
	size_t size, int prot)
	{
	unsigned long orig_iova = iova;
	size_t pgsize = SZ_4K;
	size_t orig_size = size;
	int ret = 0;

	if (!IS_ALIGNED(iova \| paddr \| size, pgsize)) {
	pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%zx\n",
	iova, &paddr, size, pgsize);
	return -EINVAL;
	}

	while (size) {
	ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
	if (ret)
	break;

	iova += pgsize;
	paddr += pgsize;
	size -= pgsize;
	}

	/* unroll mapping in case something went wrong */
	if (ret)
	etnaviv_domain_unmap(domain, orig_iova, orig_size - size);

	return ret;
	}

	static int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
	struct sg_table *sgt, unsigned len, int prot)
	{
	struct etnaviv_iommu_domain *domain = iommu->domain;
	struct scatterlist *sg;
	unsigned int da = iova;
	unsigned int i, j;
	int ret;

	if (!domain \|\| !sgt)
	return -EINVAL;

	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
	u32 pa = sg_dma_address(sg) - sg->offset;
	size_t bytes = sg_dma_len(sg) + sg->offset;

	VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);

	ret = etnaviv_domain_map(domain, da, pa, bytes, prot);
	if (ret)
	goto fail;

	da += bytes;
	}

	return 0;

	fail:
	da = iova;

	for_each_sg(sgt->sgl, sg, i, j) {
	size_t bytes = sg_dma_len(sg) + sg->offset;

	etnaviv_domain_unmap(domain, da, bytes);
	da += bytes;
	}
	return ret;
	}

	static void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
	struct sg_table *sgt, unsigned len)
	{
	struct etnaviv_iommu_domain *domain = iommu->domain;
	struct scatterlist *sg;
	unsigned int da = iova;
	int i;

	for_each_sg(sgt->sgl, sg, sgt->nents, i) {
	size_t bytes = sg_dma_len(sg) + sg->offset;

	etnaviv_domain_unmap(domain, da, bytes);

	VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);

	BUG_ON(!PAGE_ALIGNED(bytes));

	da += bytes;
	}
	}

	static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
	struct etnaviv_vram_mapping *mapping)
	{
	struct etnaviv_gem_object *etnaviv_obj = mapping->object;

	etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
	etnaviv_obj->sgt, etnaviv_obj->base.size);
	drm_mm_remove_node(&mapping->vram_node);
	}

	static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
	struct drm_mm_node *node, size_t size)
	{
	struct etnaviv_vram_mapping *free = NULL;
	enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
	int ret;

	lockdep_assert_held(&mmu->lock);

	while (1) {
	struct etnaviv_vram_mapping m, n;
	struct drm_mm_scan scan;
	struct list_head list;
	bool found;

	ret = drm_mm_insert_node_in_range(&mmu->mm, node,
	size, 0, 0, 0, U64_MAX, mode);
	if (ret != -ENOSPC)
	break;

	/* Try to retire some entries */
	drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);

	found = 0;
	INIT_LIST_HEAD(&list);
	list_for_each_entry(free, &mmu->mappings, mmu_node) {
	/* If this vram node has not been used, skip this. */
	if (!free->vram_node.mm)
	continue;

	/*
	* If the iova is pinned, then it's in-use,
	* so we must keep its mapping.
	*/
	if (free->use)
	continue;

	list_add(&free->scan_node, &list);
	if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
	found = true;
	break;
	}
	}

	if (!found) {
	/* Nothing found, clean up and fail */
	list_for_each_entry_safe(m, n, &list, scan_node)
	BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
	break;
	}

	/*
	* drm_mm does not allow any other operations while
	* scanning, so we have to remove all blocks first.
	* If drm_mm_scan_remove_block() returns false, we
	* can leave the block pinned.
	*/
	list_for_each_entry_safe(m, n, &list, scan_node)
	if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
	list_del_init(&m->scan_node);

	/*
	* Unmap the blocks which need to be reaped from the MMU.
	* Clear the mmu pointer to prevent the mapping_get finding
	* this mapping.
	*/
	list_for_each_entry_safe(m, n, &list, scan_node) {
	etnaviv_iommu_remove_mapping(mmu, m);
	m->mmu = NULL;
	list_del_init(&m->mmu_node);
	list_del_init(&m->scan_node);
	}

	mode = DRM_MM_INSERT_EVICT;

	/*
	* We removed enough mappings so that the new allocation will
	* succeed, retry the allocation one more time.
	*/
	}

	return ret;
	}

	int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
	struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
	struct etnaviv_vram_mapping *mapping)
	{
	struct sg_table *sgt = etnaviv_obj->sgt;
	struct drm_mm_node *node;
	int ret;

	lockdep_assert_held(&etnaviv_obj->lock);

	mutex_lock(&mmu->lock);

	/* v1 MMU can optimize single entry (contiguous) scatterlists */
	if (mmu->version == ETNAVIV_IOMMU_V1 &&
	sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
	u32 iova;

	iova = sg_dma_address(sgt->sgl) - memory_base;
	if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
	mapping->iova = iova;
	list_add_tail(&mapping->mmu_node, &mmu->mappings);
	ret = 0;
	goto unlock;
	}
	}

	node = &mapping->vram_node;

	ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
	if (ret < 0)
	goto unlock;

	mapping->iova = node->start;
	ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
	ETNAVIV_PROT_READ \| ETNAVIV_PROT_WRITE);

	if (ret < 0) {
	drm_mm_remove_node(node);
	goto unlock;
	}

	list_add_tail(&mapping->mmu_node, &mmu->mappings);
	mmu->flush_seq++;
	unlock:
	mutex_unlock(&mmu->lock);

	return ret;
	}

	void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
	struct etnaviv_vram_mapping *mapping)
	{
	WARN_ON(mapping->use);

	mutex_lock(&mmu->lock);

	/* If the vram node is on the mm, unmap and remove the node */
	if (mapping->vram_node.mm == &mmu->mm)
	etnaviv_iommu_remove_mapping(mmu, mapping);

	list_del(&mapping->mmu_node);
	mmu->flush_seq++;
	mutex_unlock(&mmu->lock);
	}

	void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
	{
	drm_mm_takedown(&mmu->mm);
	mmu->domain->ops->free(mmu->domain);
	kfree(mmu);
	}

	struct etnaviv_iommu etnaviv_iommu_new(struct etnaviv_gpu gpu)
	{
	enum etnaviv_iommu_version version;
	struct etnaviv_iommu *mmu;

	mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
	if (!mmu)
	return ERR_PTR(-ENOMEM);

	if (!(gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)) {
	mmu->domain = etnaviv_iommuv1_domain_alloc(gpu);
	version = ETNAVIV_IOMMU_V1;
	} else {
	mmu->domain = etnaviv_iommuv2_domain_alloc(gpu);
	version = ETNAVIV_IOMMU_V2;
	}

	if (!mmu->domain) {
	dev_err(gpu->dev, "Failed to allocate GPU IOMMU domain\n");
	kfree(mmu);
	return ERR_PTR(-ENOMEM);
	}

	mmu->gpu = gpu;
	mmu->version = version;
	mutex_init(&mmu->lock);
	INIT_LIST_HEAD(&mmu->mappings);

	drm_mm_init(&mmu->mm, mmu->domain->base, mmu->domain->size);

	return mmu;
	}

	void etnaviv_iommu_restore(struct etnaviv_gpu *gpu)
	{
	if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
	etnaviv_iommuv1_restore(gpu);
	else
	etnaviv_iommuv2_restore(gpu);
	}

	int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
	struct drm_mm_node *vram_node, size_t size,
	u32 *iova)
	{
	struct etnaviv_iommu *mmu = gpu->mmu;

	if (mmu->version == ETNAVIV_IOMMU_V1) {
	*iova = paddr - gpu->memory_base;
	return 0;
	} else {
	int ret;

	mutex_lock(&mmu->lock);
	ret = etnaviv_iommu_find_iova(mmu, vram_node, size);
	if (ret < 0) {
	mutex_unlock(&mmu->lock);
	return ret;
	}
	ret = etnaviv_domain_map(mmu->domain, vram_node->start, paddr,
	size, ETNAVIV_PROT_READ);
	if (ret < 0) {
	drm_mm_remove_node(vram_node);
	mutex_unlock(&mmu->lock);
	return ret;
	}
	mmu->flush_seq++;
	mutex_unlock(&mmu->lock);

	*iova = (u32)vram_node->start;
	return 0;
	}
	}

	void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
	struct drm_mm_node *vram_node, size_t size,
	u32 iova)
	{
	struct etnaviv_iommu *mmu = gpu->mmu;

	if (mmu->version == ETNAVIV_IOMMU_V2) {
	mutex_lock(&mmu->lock);
	etnaviv_domain_unmap(mmu->domain, iova, size);
	drm_mm_remove_node(vram_node);
	mutex_unlock(&mmu->lock);
	}
	}
	size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
	{
	return iommu->domain->ops->dump_size(iommu->domain);
	}

	void etnaviv_iommu_dump(struct etnaviv_iommu iommu, void buf)
	{
	iommu->domain->ops->dump(iommu->domain, buf);
	}