drivers/gpu/ion/ion_iommu_heap.c - kernel/msm - Gitiles

 /*
  * Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/msm_ion.h>
 #include <linux/mm.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/iommu.h>
 #include <linux/pfn.h>
 #include "ion_priv.h"

 #include <asm/mach/map.h>
 #include <asm/page.h>
 #include <asm/cacheflush.h>
 #include <mach/iommu_domains.h>

 struct ion_iommu_heap {
 	struct ion_heap heap;
 	unsigned int has_outer_cache;
 };

 struct ion_iommu_priv_data {
 	struct page **pages;
 	int nrpages;
 	unsigned long size;
 };

 static int ion_iommu_heap_allocate(struct ion_heap *heap,
 				      struct ion_buffer *buffer,
 				      unsigned long size, unsigned long align,
 				      unsigned long flags)
 {
 	int ret, i;
 	struct ion_iommu_priv_data *data = NULL;

 	if (msm_use_iommu()) {
 		struct scatterlist *sg;
 		struct sg_table *table;
 		unsigned int i;

 		data = kmalloc(sizeof(*data), GFP_KERNEL);
 		if (!data)
 			return -ENOMEM;

 		data->size = PFN_ALIGN(size);
 		data->nrpages = data->size >> PAGE_SHIFT;
 		data->pages = kzalloc(sizeof(struct page *)*data->nrpages,
 				GFP_KERNEL);
 		if (!data->pages) {
 			ret = -ENOMEM;
 			goto err1;
 		}

 		table = buffer->sg_table =
 				kzalloc(sizeof(struct sg_table), GFP_KERNEL);

 		if (!table) {
 			ret = -ENOMEM;
 			goto err1;
 		}
 		ret = sg_alloc_table(table, data->nrpages, GFP_KERNEL);
 		if (ret)
 			goto err2;

 		for_each_sg(table->sgl, sg, table->nents, i) {
 			data->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
 			if (!data->pages[i])
 				goto err3;

 			sg_set_page(sg, data->pages[i], PAGE_SIZE, 0);
 		}

 		buffer->priv_virt = data;
 		return 0;

 	} else {
 		return -ENOMEM;
 	}


 err3:
 	sg_free_table(buffer->sg_table);
 err2:
 	kfree(buffer->sg_table);
 	buffer->sg_table = 0;

 	for (i = 0; i < data->nrpages; i++) {
 		if (data->pages[i])
 			__free_page(data->pages[i]);
 	}
 	kfree(data->pages);
 err1:
 	kfree(data);
 	return ret;
 }

 static void ion_iommu_heap_free(struct ion_buffer *buffer)
 {
 	struct ion_iommu_priv_data *data = buffer->priv_virt;
 	int i;

 	if (!data)
 		return;

 	for (i = 0; i < data->nrpages; i++)
 		__free_page(data->pages[i]);

 	kfree(data->pages);
 	kfree(data);
 }

 void *ion_iommu_heap_map_kernel(struct ion_heap *heap,
 				struct ion_buffer *buffer)
 {
 	struct ion_iommu_priv_data *data = buffer->priv_virt;
 	pgprot_t page_prot = PAGE_KERNEL;

 	if (!data)
 		return NULL;

 	if (!ION_IS_CACHED(buffer->flags))
 		page_prot = pgprot_noncached(page_prot);

 	buffer->vaddr = vmap(data->pages, data->nrpages, VM_IOREMAP, page_prot);

 	return buffer->vaddr;
 }

 void ion_iommu_heap_unmap_kernel(struct ion_heap *heap,
 				    struct ion_buffer *buffer)
 {
 	if (!buffer->vaddr)
 		return;

 	vunmap(buffer->vaddr);
 	buffer->vaddr = NULL;
 }

 int ion_iommu_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
 			       struct vm_area_struct *vma)
 {
 	struct ion_iommu_priv_data *data = buffer->priv_virt;
 	int i;
 	unsigned long curr_addr;
 	if (!data)
 		return -EINVAL;

 	if (!ION_IS_CACHED(buffer->flags))
 		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);

 	curr_addr = vma->vm_start;
 	for (i = 0; i < data->nrpages && curr_addr < vma->vm_end; i++) {
 		if (vm_insert_page(vma, curr_addr, data->pages[i])) {
 			/*
 			 * This will fail the mmap which will
 			 * clean up the vma space properly.
 			 */
 			return -EINVAL;
 		}
 		curr_addr += PAGE_SIZE;
 	}
 	return 0;
 }

 int ion_iommu_heap_map_iommu(struct ion_buffer *buffer,
 					struct ion_iommu_map *data,
 					unsigned int domain_num,
 					unsigned int partition_num,
 					unsigned long align,
 					unsigned long iova_length,
 					unsigned long flags)
 {
 	struct iommu_domain *domain;
 	int ret = 0;
 	unsigned long extra;
 	int prot = IOMMU_WRITE | IOMMU_READ;
 	prot |= ION_IS_CACHED(flags) ? IOMMU_CACHE : 0;

 	BUG_ON(!msm_use_iommu());

 	data->mapped_size = iova_length;
 	extra = iova_length - buffer->size;

 	ret = msm_allocate_iova_address(domain_num, partition_num,
 						data->mapped_size, align,
 						&data->iova_addr);

 	if (ret)
 		goto out;

 	domain = msm_get_iommu_domain(domain_num);

 	if (!domain) {
 		ret = -ENOMEM;
 		goto out1;
 	}

 	ret = iommu_map_range(domain, data->iova_addr,
 			      buffer->sg_table->sgl,
 			      buffer->size, prot);
 	if (ret) {
 		pr_err("%s: could not map %lx in domain %p\n",
 			__func__, data->iova_addr, domain);
 		goto out1;
 	}

 	if (extra) {
 		unsigned long extra_iova_addr = data->iova_addr + buffer->size;
 		ret = msm_iommu_map_extra(domain, extra_iova_addr, extra, SZ_4K,
 					  prot);
 		if (ret)
 			goto out2;
 	}
 	return ret;

 out2:
 	iommu_unmap_range(domain, data->iova_addr, buffer->size);
 out1:
 	msm_free_iova_address(data->iova_addr, domain_num, partition_num,
 				buffer->size);

 out:

 	return ret;
 }

 void ion_iommu_heap_unmap_iommu(struct ion_iommu_map *data)
 {
 	unsigned int domain_num;
 	unsigned int partition_num;
 	struct iommu_domain *domain;

 	BUG_ON(!msm_use_iommu());

 	domain_num = iommu_map_domain(data);
 	partition_num = iommu_map_partition(data);

 	domain = msm_get_iommu_domain(domain_num);

 	if (!domain) {
 		WARN(1, "Could not get domain %d. Corruption?\n", domain_num);
 		return;
 	}

 	iommu_unmap_range(domain, data->iova_addr, data->mapped_size);
 	msm_free_iova_address(data->iova_addr, domain_num, partition_num,
 				data->mapped_size);

 	return;
 }

 static int ion_iommu_cache_ops(struct ion_heap *heap, struct ion_buffer *buffer,
 			void *vaddr, unsigned int offset, unsigned int length,
 			unsigned int cmd)
 {
 	void (*outer_cache_op)(phys_addr_t, phys_addr_t);
 	struct ion_iommu_heap *iommu_heap =
 	     container_of(heap, struct  ion_iommu_heap, heap);

 	switch (cmd) {
 	case ION_IOC_CLEAN_CACHES:
 		dmac_clean_range(vaddr, vaddr + length);
 		outer_cache_op = outer_clean_range;
 		break;
 	case ION_IOC_INV_CACHES:
 		dmac_inv_range(vaddr, vaddr + length);
 		outer_cache_op = outer_inv_range;
 		break;
 	case ION_IOC_CLEAN_INV_CACHES:
 		dmac_flush_range(vaddr, vaddr + length);
 		outer_cache_op = outer_flush_range;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (iommu_heap->has_outer_cache) {
 		unsigned long pstart;
 		unsigned int i;
 		struct ion_iommu_priv_data *data = buffer->priv_virt;
 		if (!data)
 			return -ENOMEM;

 		for (i = 0; i < data->nrpages; ++i) {
 			pstart = page_to_phys(data->pages[i]);
 			outer_cache_op(pstart, pstart + PAGE_SIZE);
 		}
 	}
 	return 0;
 }

 static struct sg_table *ion_iommu_heap_map_dma(struct ion_heap *heap,
 					      struct ion_buffer *buffer)
 {
 	return buffer->sg_table;
 }

 static void ion_iommu_heap_unmap_dma(struct ion_heap *heap,
 				 struct ion_buffer *buffer)
 {
 	if (buffer->sg_table)
 		sg_free_table(buffer->sg_table);
 	kfree(buffer->sg_table);
 	buffer->sg_table = 0;
 }

 static struct ion_heap_ops iommu_heap_ops = {
 	.allocate = ion_iommu_heap_allocate,
 	.free = ion_iommu_heap_free,
 	.map_user = ion_iommu_heap_map_user,
 	.map_kernel = ion_iommu_heap_map_kernel,
 	.unmap_kernel = ion_iommu_heap_unmap_kernel,
 	.map_iommu = ion_iommu_heap_map_iommu,
 	.unmap_iommu = ion_iommu_heap_unmap_iommu,
 	.cache_op = ion_iommu_cache_ops,
 	.map_dma = ion_iommu_heap_map_dma,
 	.unmap_dma = ion_iommu_heap_unmap_dma,
 };

 struct ion_heap *ion_iommu_heap_create(struct ion_platform_heap *heap_data)
 {
 	struct ion_iommu_heap *iommu_heap;

 	iommu_heap = kzalloc(sizeof(struct ion_iommu_heap), GFP_KERNEL);
 	if (!iommu_heap)
 		return ERR_PTR(-ENOMEM);

 	iommu_heap->heap.ops = &iommu_heap_ops;
 	iommu_heap->heap.type = ION_HEAP_TYPE_IOMMU;
 	iommu_heap->has_outer_cache = heap_data->has_outer_cache;

 	return &iommu_heap->heap;
 }

 void ion_iommu_heap_destroy(struct ion_heap *heap)
 {
 	struct ion_iommu_heap *iommu_heap =
 	     container_of(heap, struct  ion_iommu_heap, heap);

 	kfree(iommu_heap);
 	iommu_heap = NULL;
 }
	/*
	* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/msm_ion.h>
	#include <linux/mm.h>
	#include <linux/scatterlist.h>
	#include <linux/slab.h>
	#include <linux/vmalloc.h>
	#include <linux/iommu.h>
	#include <linux/pfn.h>
	#include "ion_priv.h"

	#include <asm/mach/map.h>
	#include <asm/page.h>
	#include <asm/cacheflush.h>
	#include <mach/iommu_domains.h>

	struct ion_iommu_heap {
	struct ion_heap heap;
	unsigned int has_outer_cache;
	};

	struct ion_iommu_priv_data {
	struct page **pages;
	int nrpages;
	unsigned long size;
	};

	static int ion_iommu_heap_allocate(struct ion_heap *heap,
	struct ion_buffer *buffer,
	unsigned long size, unsigned long align,
	unsigned long flags)
	{
	int ret, i;
	struct ion_iommu_priv_data *data = NULL;

	if (msm_use_iommu()) {
	struct scatterlist *sg;
	struct sg_table *table;
	unsigned int i;

	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	data->size = PFN_ALIGN(size);
	data->nrpages = data->size >> PAGE_SHIFT;
	data->pages = kzalloc(sizeof(struct page )data->nrpages,
	GFP_KERNEL);
	if (!data->pages) {
	ret = -ENOMEM;
	goto err1;
	}

	table = buffer->sg_table =
	kzalloc(sizeof(struct sg_table), GFP_KERNEL);

	if (!table) {
	ret = -ENOMEM;
	goto err1;
	}
	ret = sg_alloc_table(table, data->nrpages, GFP_KERNEL);
	if (ret)
	goto err2;

	for_each_sg(table->sgl, sg, table->nents, i) {
	data->pages[i] = alloc_page(GFP_KERNEL \| __GFP_ZERO);
	if (!data->pages[i])
	goto err3;

	sg_set_page(sg, data->pages[i], PAGE_SIZE, 0);
	}

	buffer->priv_virt = data;
	return 0;

	} else {
	return -ENOMEM;
	}


	err3:
	sg_free_table(buffer->sg_table);
	err2:
	kfree(buffer->sg_table);
	buffer->sg_table = 0;

	for (i = 0; i < data->nrpages; i++) {
	if (data->pages[i])
	__free_page(data->pages[i]);
	}
	kfree(data->pages);
	err1:
	kfree(data);
	return ret;
	}

	static void ion_iommu_heap_free(struct ion_buffer *buffer)
	{
	struct ion_iommu_priv_data *data = buffer->priv_virt;
	int i;

	if (!data)
	return;

	for (i = 0; i < data->nrpages; i++)
	__free_page(data->pages[i]);

	kfree(data->pages);
	kfree(data);
	}

	void ion_iommu_heap_map_kernel(struct ion_heap heap,
	struct ion_buffer *buffer)
	{
	struct ion_iommu_priv_data *data = buffer->priv_virt;
	pgprot_t page_prot = PAGE_KERNEL;

	if (!data)
	return NULL;

	if (!ION_IS_CACHED(buffer->flags))
	page_prot = pgprot_noncached(page_prot);

	buffer->vaddr = vmap(data->pages, data->nrpages, VM_IOREMAP, page_prot);

	return buffer->vaddr;
	}

	void ion_iommu_heap_unmap_kernel(struct ion_heap *heap,
	struct ion_buffer *buffer)
	{
	if (!buffer->vaddr)
	return;

	vunmap(buffer->vaddr);
	buffer->vaddr = NULL;
	}

	int ion_iommu_heap_map_user(struct ion_heap heap, struct ion_buffer buffer,
	struct vm_area_struct *vma)
	{
	struct ion_iommu_priv_data *data = buffer->priv_virt;
	int i;
	unsigned long curr_addr;
	if (!data)
	return -EINVAL;

	if (!ION_IS_CACHED(buffer->flags))
	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);

	curr_addr = vma->vm_start;
	for (i = 0; i < data->nrpages && curr_addr < vma->vm_end; i++) {
	if (vm_insert_page(vma, curr_addr, data->pages[i])) {
	/*
	* This will fail the mmap which will
	* clean up the vma space properly.
	*/
	return -EINVAL;
	}
	curr_addr += PAGE_SIZE;
	}
	return 0;
	}

	int ion_iommu_heap_map_iommu(struct ion_buffer *buffer,
	struct ion_iommu_map *data,
	unsigned int domain_num,
	unsigned int partition_num,
	unsigned long align,
	unsigned long iova_length,
	unsigned long flags)
	{
	struct iommu_domain *domain;
	int ret = 0;
	unsigned long extra;
	int prot = IOMMU_WRITE \| IOMMU_READ;
	prot \|= ION_IS_CACHED(flags) ? IOMMU_CACHE : 0;

	BUG_ON(!msm_use_iommu());

	data->mapped_size = iova_length;
	extra = iova_length - buffer->size;

	ret = msm_allocate_iova_address(domain_num, partition_num,
	data->mapped_size, align,
	&data->iova_addr);

	if (ret)
	goto out;

	domain = msm_get_iommu_domain(domain_num);

	if (!domain) {
	ret = -ENOMEM;
	goto out1;
	}

	ret = iommu_map_range(domain, data->iova_addr,
	buffer->sg_table->sgl,
	buffer->size, prot);
	if (ret) {
	pr_err("%s: could not map %lx in domain %p\n",
	__func__, data->iova_addr, domain);
	goto out1;
	}

	if (extra) {
	unsigned long extra_iova_addr = data->iova_addr + buffer->size;
	ret = msm_iommu_map_extra(domain, extra_iova_addr, extra, SZ_4K,
	prot);
	if (ret)
	goto out2;
	}
	return ret;

	out2:
	iommu_unmap_range(domain, data->iova_addr, buffer->size);
	out1:
	msm_free_iova_address(data->iova_addr, domain_num, partition_num,
	buffer->size);

	out:

	return ret;
	}

	void ion_iommu_heap_unmap_iommu(struct ion_iommu_map *data)
	{
	unsigned int domain_num;
	unsigned int partition_num;
	struct iommu_domain *domain;

	BUG_ON(!msm_use_iommu());

	domain_num = iommu_map_domain(data);
	partition_num = iommu_map_partition(data);

	domain = msm_get_iommu_domain(domain_num);

	if (!domain) {
	WARN(1, "Could not get domain %d. Corruption?\n", domain_num);
	return;
	}

	iommu_unmap_range(domain, data->iova_addr, data->mapped_size);
	msm_free_iova_address(data->iova_addr, domain_num, partition_num,
	data->mapped_size);

	return;
	}

	static int ion_iommu_cache_ops(struct ion_heap heap, struct ion_buffer buffer,
	void *vaddr, unsigned int offset, unsigned int length,
	unsigned int cmd)
	{
	void (*outer_cache_op)(phys_addr_t, phys_addr_t);
	struct ion_iommu_heap *iommu_heap =
	container_of(heap, struct ion_iommu_heap, heap);

	switch (cmd) {
	case ION_IOC_CLEAN_CACHES:
	dmac_clean_range(vaddr, vaddr + length);
	outer_cache_op = outer_clean_range;
	break;
	case ION_IOC_INV_CACHES:
	dmac_inv_range(vaddr, vaddr + length);
	outer_cache_op = outer_inv_range;
	break;
	case ION_IOC_CLEAN_INV_CACHES:
	dmac_flush_range(vaddr, vaddr + length);
	outer_cache_op = outer_flush_range;
	break;
	default:
	return -EINVAL;
	}

	if (iommu_heap->has_outer_cache) {
	unsigned long pstart;
	unsigned int i;
	struct ion_iommu_priv_data *data = buffer->priv_virt;
	if (!data)
	return -ENOMEM;

	for (i = 0; i < data->nrpages; ++i) {
	pstart = page_to_phys(data->pages[i]);
	outer_cache_op(pstart, pstart + PAGE_SIZE);
	}
	}
	return 0;
	}

	static struct sg_table ion_iommu_heap_map_dma(struct ion_heap heap,
	struct ion_buffer *buffer)
	{
	return buffer->sg_table;
	}

	static void ion_iommu_heap_unmap_dma(struct ion_heap *heap,
	struct ion_buffer *buffer)
	{
	if (buffer->sg_table)
	sg_free_table(buffer->sg_table);
	kfree(buffer->sg_table);
	buffer->sg_table = 0;
	}

	static struct ion_heap_ops iommu_heap_ops = {
	.allocate = ion_iommu_heap_allocate,
	.free = ion_iommu_heap_free,
	.map_user = ion_iommu_heap_map_user,
	.map_kernel = ion_iommu_heap_map_kernel,
	.unmap_kernel = ion_iommu_heap_unmap_kernel,
	.map_iommu = ion_iommu_heap_map_iommu,
	.unmap_iommu = ion_iommu_heap_unmap_iommu,
	.cache_op = ion_iommu_cache_ops,
	.map_dma = ion_iommu_heap_map_dma,
	.unmap_dma = ion_iommu_heap_unmap_dma,
	};

	struct ion_heap ion_iommu_heap_create(struct ion_platform_heap heap_data)
	{
	struct ion_iommu_heap *iommu_heap;

	iommu_heap = kzalloc(sizeof(struct ion_iommu_heap), GFP_KERNEL);
	if (!iommu_heap)
	return ERR_PTR(-ENOMEM);

	iommu_heap->heap.ops = &iommu_heap_ops;
	iommu_heap->heap.type = ION_HEAP_TYPE_IOMMU;
	iommu_heap->has_outer_cache = heap_data->has_outer_cache;

	return &iommu_heap->heap;
	}

	void ion_iommu_heap_destroy(struct ion_heap *heap)
	{
	struct ion_iommu_heap *iommu_heap =
	container_of(heap, struct ion_iommu_heap, heap);

	kfree(iommu_heap);
	iommu_heap = NULL;
	}