[PATCH 05/18] ARM/dma-mapping: Switch to iommu_dma_ops

Robin Murphy
2020-08-20T15:09:28Z

With the IOMMU ops now looking much the same shape as iommu_dma_ops,
switch them out in favour of the iommu-dma library, currently enhanced
with temporary workarounds that allow it to also sit underneath the
arch-specific API. With that in place, we can now start converting the
remaining IOMMU drivers and consumers to work with IOMMU API default
domains instead.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
arch/arm/Kconfig | 24 +-
arch/arm/include/asm/dma-iommu.h | 8 -
arch/arm/mm/dma-mapping.c | 887 +------------------------------
drivers/iommu/Kconfig | 8 -
drivers/media/platform/Kconfig | 1 -
5 files changed, 22 insertions(+), 906 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b91273f9fd43..79406fe5cd6b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -133,31 +133,11 @@ config ARM_HAS_SG_CHAIN
bool

config ARM_DMA_USE_IOMMU
- bool
+ def_bool IOMMU_SUPPORT
select ARM_HAS_SG_CHAIN
+ select IOMMU_DMA
select NEED_SG_DMA_LENGTH

-if ARM_DMA_USE_IOMMU
-
-config ARM_DMA_IOMMU_ALIGNMENT
- int "Maximum PAGE_SIZE order of alignment for DMA IOMMU buffers"
- range 4 9
- default 8
- help
- DMA mapping framework by default aligns all buffers to the smallest
- PAGE_SIZE order which is greater than or equal to the requested buffer
- size. This works well for buffers up to a few hundreds kilobytes, but
- for larger buffers it just a waste of address space. Drivers which has
- relatively small addressing window (like 64Mib) might run out of
- virtual space with just a few allocations.
-
- With this parameter you can specify the maximum PAGE_SIZE order for
- DMA IOMMU buffers. Larger buffers will be aligned only to this
- specified order. The order is expressed as a power of two multiplied
- by the PAGE_SIZE.
-
-endif
-
config SYS_SUPPORTS_APM_EMULATION
bool

diff --git a/arch/arm/include/asm/dma-iommu.h b/arch/arm/include/asm/dma-iommu.h
index 86405cc81385..f39cfa509fe4 100644
--- a/arch/arm/include/asm/dma-iommu.h
+++ b/arch/arm/include/asm/dma-iommu.h
@@ -13,14 +13,6 @@ struct dma_iommu_mapping {
/* iommu specific data */
struct iommu_domain *domain;

- unsigned long **bitmaps; /* array of bitmaps */
- unsigned int nr_bitmaps; /* nr of elements in array */
- unsigned int extensions;
- size_t bitmap_size; /* size of a single bitmap */
- size_t bits; /* per bitmap */
- dma_addr_t base;
-
- spinlock_t lock;
struct kref kref;
};

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 0537c97cebe1..0f69ede44cd7 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -15,6 +15,7 @@
#include <linux/init.h>
#include <linux/device.h>
#include <linux/dma-direct.h>
+#include <linux/dma-iommu.h>
#include <linux/dma-mapping.h>
#include <linux/dma-noncoherent.h>
#include <linux/dma-contiguous.h>
@@ -1074,812 +1075,9 @@ static const struct dma_map_ops *arm_get_dma_map_ops(bool coherent)

#ifdef CONFIG_ARM_DMA_USE_IOMMU

-static int __dma_info_to_prot(enum dma_data_direction dir, unsigned long attrs)
-{
- int prot = 0;
-
- if (attrs & DMA_ATTR_PRIVILEGED)
- prot |= IOMMU_PRIV;
-
- switch (dir) {
- case DMA_BIDIRECTIONAL:
- return prot | IOMMU_READ | IOMMU_WRITE;
- case DMA_TO_DEVICE:
- return prot | IOMMU_READ;
- case DMA_FROM_DEVICE:
- return prot | IOMMU_WRITE;
- default:
- return prot;
- }
-}
-
-/* IOMMU */
-
-static int extend_iommu_mapping(struct dma_iommu_mapping *mapping);
-
-static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,
- size_t size)
-{
- unsigned int order = get_order(size);
- unsigned int align = 0;
- unsigned int count, start;
- size_t mapping_size = mapping->bits << PAGE_SHIFT;
- unsigned long flags;
- dma_addr_t iova;
- int i;
-
- if (order > CONFIG_ARM_DMA_IOMMU_ALIGNMENT)
- order = CONFIG_ARM_DMA_IOMMU_ALIGNMENT;
-
- count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- align = (1 << order) - 1;
-
- spin_lock_irqsave(&mapping->lock, flags);
- for (i = 0; i < mapping->nr_bitmaps; i++) {
- start = bitmap_find_next_zero_area(mapping->bitmaps[i],
- mapping->bits, 0, count, align);
-
- if (start > mapping->bits)
- continue;
-
- bitmap_set(mapping->bitmaps[i], start, count);
- break;
- }
-
- /*
- * No unused range found. Try to extend the existing mapping
- * and perform a second attempt to reserve an IO virtual
- * address range of size bytes.
- */
- if (i == mapping->nr_bitmaps) {
- if (extend_iommu_mapping(mapping)) {
- spin_unlock_irqrestore(&mapping->lock, flags);
- return DMA_MAPPING_ERROR;
- }
-
- start = bitmap_find_next_zero_area(mapping->bitmaps[i],
- mapping->bits, 0, count, align);
-
- if (start > mapping->bits) {
- spin_unlock_irqrestore(&mapping->lock, flags);
- return DMA_MAPPING_ERROR;
- }
-
- bitmap_set(mapping->bitmaps[i], start, count);
- }
- spin_unlock_irqrestore(&mapping->lock, flags);
-
- iova = mapping->base + (mapping_size * i);
- iova += start << PAGE_SHIFT;
-
- return iova;
-}
-
-static inline void __free_iova(struct dma_iommu_mapping *mapping,
- dma_addr_t addr, size_t size)
-{
- unsigned int start, count;
- size_t mapping_size = mapping->bits << PAGE_SHIFT;
- unsigned long flags;
- dma_addr_t bitmap_base;
- u32 bitmap_index;
-
- if (!size)
- return;
-
- bitmap_index = (u32) (addr - mapping->base) / (u32) mapping_size;
- BUG_ON(addr < mapping->base || bitmap_index > mapping->extensions);
-
- bitmap_base = mapping->base + mapping_size * bitmap_index;
-
- start = (addr - bitmap_base) >> PAGE_SHIFT;
-
- if (addr + size > bitmap_base + mapping_size) {
- /*
- * The address range to be freed reaches into the iova
- * range of the next bitmap. This should not happen as
- * we don't allow this in __alloc_iova (at the
- * moment).
- */
- BUG();
- } else
- count = size >> PAGE_SHIFT;
-
- spin_lock_irqsave(&mapping->lock, flags);
- bitmap_clear(mapping->bitmaps[bitmap_index], start, count);
- spin_unlock_irqrestore(&mapping->lock, flags);
-}
-
-/* We'll try 2M, 1M, 64K, and finally 4K; array must end with 0! */
-static const int iommu_order_array[] = { 9, 8, 4, 0 };
-
-static struct page **__iommu_alloc_buffer(struct device *dev, size_t size,
- gfp_t gfp, unsigned long attrs,
- int coherent_flag)
-{
- struct page **pages;
- int count = size >> PAGE_SHIFT;
- int array_size = count * sizeof(struct page *);
- int i = 0;
- int order_idx = 0;
-
- if (array_size <= PAGE_SIZE)
- pages = kzalloc(array_size, GFP_KERNEL);
- else
- pages = vzalloc(array_size);
- if (!pages)
- return NULL;
-
- if (attrs & DMA_ATTR_FORCE_CONTIGUOUS)
- {
- unsigned long order = get_order(size);
- struct page *page;
-
- page = dma_alloc_from_contiguous(dev, count, order,
- gfp & __GFP_NOWARN);
- if (!page)
- goto error;
-
- __dma_clear_buffer(page, size, coherent_flag);
-
- for (i = 0; i < count; i++)
- pages[i] = page + i;
-
- return pages;
- }
-
- /* Go straight to 4K chunks if caller says it's OK. */
- if (attrs & DMA_ATTR_ALLOC_SINGLE_PAGES)
- order_idx = ARRAY_SIZE(iommu_order_array) - 1;
-
- /*
- * IOMMU can map any pages, so himem can also be used here
- */
- gfp |= __GFP_NOWARN | __GFP_HIGHMEM;
-
- while (count) {
- int j, order;
-
- order = iommu_order_array[order_idx];
-
- /* Drop down when we get small */
- if (__fls(count) < order) {
- order_idx++;
- continue;
- }
-
- if (order) {
- /* See if it's easy to allocate a high-order chunk */
- pages[i] = alloc_pages(gfp | __GFP_NORETRY, order);
-
- /* Go down a notch at first sign of pressure */
- if (!pages[i]) {
- order_idx++;
- continue;
- }
- } else {
- pages[i] = alloc_pages(gfp, 0);
- if (!pages[i])
- goto error;
- }
-
- if (order) {
- split_page(pages[i], order);
- j = 1 << order;
- while (--j)
- pages[i + j] = pages[i] + j;
- }
-
- __dma_clear_buffer(pages[i], PAGE_SIZE << order, coherent_flag);
- i += 1 << order;
- count -= 1 << order;
- }
-
- return pages;
-error:
- while (i--)
- if (pages[i])
- __free_pages(pages[i], 0);
- kvfree(pages);
- return NULL;
-}
-
-static int __iommu_free_buffer(struct device *dev, struct page **pages,
- size_t size, unsigned long attrs)
-{
- int count = size >> PAGE_SHIFT;
- int i;
-
- if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
- dma_release_from_contiguous(dev, pages[0], count);
- } else {
- for (i = 0; i < count; i++)
- if (pages[i])
- __free_pages(pages[i], 0);
- }
-
- kvfree(pages);
- return 0;
-}
-
-/*
- * Create a mapping in device IO address space for specified pages
- */
-static dma_addr_t
-__iommu_create_mapping(struct device *dev, struct page **pages, size_t size,
- unsigned long attrs)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
- unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- dma_addr_t dma_addr, iova;
- int i;
-
- dma_addr = __alloc_iova(mapping, size);
- if (dma_addr == DMA_MAPPING_ERROR)
- return dma_addr;
-
- iova = dma_addr;
- for (i = 0; i < count; ) {
- int ret;
-
- unsigned int next_pfn = page_to_pfn(pages[i]) + 1;
- phys_addr_t phys = page_to_phys(pages[i]);
- unsigned int len, j;
-
- for (j = i + 1; j < count; j++, next_pfn++)
- if (page_to_pfn(pages[j]) != next_pfn)
- break;
-
- len = (j - i) << PAGE_SHIFT;
- ret = iommu_map(mapping->domain, iova, phys, len,
- __dma_info_to_prot(DMA_BIDIRECTIONAL, attrs));
- if (ret < 0)
- goto fail;
- iova += len;
- i = j;
- }
- return dma_addr;
-fail:
- iommu_unmap(mapping->domain, dma_addr, iova-dma_addr);
- __free_iova(mapping, dma_addr, size);
- return DMA_MAPPING_ERROR;
-}
-
-static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
-
- /*
- * add optional in-page offset from iova to size and align
- * result to page size
- */
- size = PAGE_ALIGN((iova & ~PAGE_MASK) + size);
- iova &= PAGE_MASK;
-
- iommu_unmap(mapping->domain, iova, size);
- __free_iova(mapping, iova, size);
- return 0;
-}
-
-static struct page **__atomic_get_pages(void *addr)
-{
- struct page *page;
- phys_addr_t phys;
-
- phys = gen_pool_virt_to_phys(atomic_pool, (unsigned long)addr);
- page = phys_to_page(phys);
-
- return (struct page **)page;
-}
-
-static struct page **__iommu_get_pages(void *cpu_addr, unsigned long attrs)
-{
- if (__in_atomic_pool(cpu_addr, PAGE_SIZE))
- return __atomic_get_pages(cpu_addr);
-
- if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
- return cpu_addr;
-
- return dma_common_find_pages(cpu_addr);
-}
-
-static void *__iommu_alloc_simple(struct device *dev, size_t size, gfp_t gfp,
- dma_addr_t *handle, int coherent_flag,
- unsigned long attrs)
-{
- struct page *page;
- void *addr;
-
- if (coherent_flag == COHERENT)
- addr = __alloc_simple_buffer(dev, size, gfp, &page);
- else
- addr = __alloc_from_pool(size, &page);
- if (!addr)
- return NULL;
-
- *handle = __iommu_create_mapping(dev, &page, size, attrs);
- if (*handle == DMA_MAPPING_ERROR)
- goto err_mapping;
-
- return addr;
-
-err_mapping:
- __free_from_pool(addr, size);
- return NULL;
-}
-
-static void __iommu_free_atomic(struct device *dev, void *cpu_addr,
- dma_addr_t handle, size_t size, int coherent_flag)
-{
- __iommu_remove_mapping(dev, handle, size);
- if (coherent_flag == COHERENT)
- __dma_free_buffer(virt_to_page(cpu_addr), size);
- else
- __free_from_pool(cpu_addr, size);
-}
-
-static void *arm_iommu_alloc_attrs(struct device *dev, size_t size,
- dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
-{
- pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL);
- struct page **pages;
- void *addr = NULL;
- int coherent_flag = dev->dma_coherent ? COHERENT : NORMAL;
-
- *handle = DMA_MAPPING_ERROR;
- size = PAGE_ALIGN(size);
-
- if (coherent_flag == COHERENT || !gfpflags_allow_blocking(gfp))
- return __iommu_alloc_simple(dev, size, gfp, handle,
- coherent_flag, attrs);
-
- /*
- * Following is a work-around (a.k.a. hack) to prevent pages
- * with __GFP_COMP being passed to split_page() which cannot
- * handle them. The real problem is that this flag probably
- * should be 0 on ARM as it is not supported on this
- * platform; see CONFIG_HUGETLBFS.
- */
- gfp &= ~(__GFP_COMP);
-
- pages = __iommu_alloc_buffer(dev, size, gfp, attrs, coherent_flag);
- if (!pages)
- return NULL;
-
- *handle = __iommu_create_mapping(dev, pages, size, attrs);
- if (*handle == DMA_MAPPING_ERROR)
- goto err_buffer;
-
- if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
- return pages;
-
- addr = dma_common_pages_remap(pages, size, prot,
- __builtin_return_address(0));
- if (!addr)
- goto err_mapping;
-
- return addr;
-
-err_mapping:
- __iommu_remove_mapping(dev, *handle, size);
-err_buffer:
- __iommu_free_buffer(dev, pages, size, attrs);
- return NULL;
-}
-
-static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
- void *cpu_addr, dma_addr_t dma_addr, size_t size,
- unsigned long attrs)
-{
- struct page **pages = __iommu_get_pages(cpu_addr, attrs);
- unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- int err;
-
- if (!pages)
- return -ENXIO;
-
- if (vma->vm_pgoff >= nr_pages)
- return -ENXIO;
-
- if (!dev->dma_coherent)
- vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
-
- err = vm_map_pages(vma, pages, nr_pages);
- if (err)
- pr_err("Remapping memory failed: %d\n", err);
-
- return err;
-}
-
-/*
- * free a page as defined by the above mapping.
- * Must not be called with IRQs disabled.
- */
-static void arm_iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t handle, unsigned long attrs)
-{
- int coherent_flag = dev->dma_coherent ? COHERENT : NORMAL;
- struct page **pages;
- size = PAGE_ALIGN(size);
-
- if (coherent_flag == COHERENT || __in_atomic_pool(cpu_addr, size)) {
- __iommu_free_atomic(dev, cpu_addr, handle, size, coherent_flag);
- return;
- }
-
- pages = __iommu_get_pages(cpu_addr, attrs);
- if (!pages) {
- WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
- return;
- }
-
- if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) == 0)
- dma_common_free_remap(cpu_addr, size);
-
- __iommu_remove_mapping(dev, handle, size);
- __iommu_free_buffer(dev, pages, size, attrs);
-}
-
-static int arm_iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
- void *cpu_addr, dma_addr_t dma_addr,
- size_t size, unsigned long attrs)
-{
- unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
- struct page **pages = __iommu_get_pages(cpu_addr, attrs);
-
- if (!pages)
- return -ENXIO;
-
- return sg_alloc_table_from_pages(sgt, pages, count, 0, size,
- GFP_KERNEL);
-}
-
-/*
- * Map a part of the scatter-gather list into contiguous io address space
- */
-static int __map_sg_chunk(struct device *dev, struct scatterlist *sg,
- size_t size, dma_addr_t *handle,
- enum dma_data_direction dir, unsigned long attrs)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
- dma_addr_t iova, iova_base;
- int ret = 0;
- unsigned int count;
- struct scatterlist *s;
- int prot;
-
- size = PAGE_ALIGN(size);
- *handle = DMA_MAPPING_ERROR;
-
- iova_base = iova = __alloc_iova(mapping, size);
- if (iova == DMA_MAPPING_ERROR)
- return -ENOMEM;
-
- for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) {
- phys_addr_t phys = page_to_phys(sg_page(s));
- unsigned int len = PAGE_ALIGN(s->offset + s->length);
-
- if (!dev->dma_coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
-
- prot = __dma_info_to_prot(dir, attrs);
-
- ret = iommu_map(mapping->domain, iova, phys, len, prot);
- if (ret < 0)
- goto fail;
- count += len >> PAGE_SHIFT;
- iova += len;
- }
- *handle = iova_base;
-
- return 0;
-fail:
- iommu_unmap(mapping->domain, iova_base, count * PAGE_SIZE);
- __free_iova(mapping, iova_base, size);
- return ret;
-}
-
-/**
- * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA
- * @dev: valid struct device pointer
- * @sg: list of buffers
- * @nents: number of buffers to map
- * @dir: DMA transfer direction
- *
- * Map a set of buffers described by scatterlist in streaming mode for DMA.
- * The scatter gather list elements are merged together (if possible) and
- * tagged with the appropriate dma address and length. They are obtained via
- * sg_dma_{address,length}.
- */
-static int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- struct scatterlist *s = sg, *dma = sg, *start = sg;
- int i, count = 0;
- unsigned int offset = s->offset;
- unsigned int size = s->offset + s->length;
- unsigned int max = dma_get_max_seg_size(dev);
-
- for (i = 1; i < nents; i++) {
- s = sg_next(s);
-
- s->dma_address = DMA_MAPPING_ERROR;
- s->dma_length = 0;
-
- if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) {
- if (__map_sg_chunk(dev, start, size, &dma->dma_address,
- dir, attrs) < 0)
- goto bad_mapping;
-
- dma->dma_address += offset;
- dma->dma_length = size - offset;
-
- size = offset = s->offset;
- start = s;
- dma = sg_next(dma);
- count += 1;
- }
- size += s->length;
- }
- if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs) < 0)
- goto bad_mapping;
-
- dma->dma_address += offset;
- dma->dma_length = size - offset;
-
- return count+1;
-
-bad_mapping:
- for_each_sg(sg, s, count, i)
- __iommu_remove_mapping(dev, sg_dma_address(s), sg_dma_len(s));
- return 0;
-}
-
-/**
- * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
- * @dev: valid struct device pointer
- * @sg: list of buffers
- * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
- * @dir: DMA transfer direction (same as was passed to dma_map_sg)
- *
- * Unmap a set of streaming mode DMA translations. Again, CPU access
- * rules concerning calls here are the same as for dma_unmap_single().
- */
-static void arm_iommu_unmap_sg(struct device *dev,
- struct scatterlist *sg, int nents,
- enum dma_data_direction dir,
- unsigned long attrs)
-{
- struct scatterlist *s;
- int i;
-
- for_each_sg(sg, s, nents, i) {
- if (sg_dma_len(s))
- __iommu_remove_mapping(dev, sg_dma_address(s),
- sg_dma_len(s));
- if (!dev->dma_coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_page_dev_to_cpu(sg_page(s), s->offset,
- s->length, dir);
- }
-}
-
-/**
- * arm_iommu_sync_sg_for_cpu
- * @dev: valid struct device pointer
- * @sg: list of buffers
- * @nents: number of buffers to map (returned from dma_map_sg)
- * @dir: DMA transfer direction (same as was passed to dma_map_sg)
- */
-static void arm_iommu_sync_sg_for_cpu(struct device *dev,
- struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
-{
- struct scatterlist *s;
- int i;
-
- if (dev->dma_coherent)
- return;
-
- for_each_sg(sg, s, nents, i)
- __dma_page_dev_to_cpu(sg_page(s), s->offset, s->length, dir);
-
-}
-
-/**
- * arm_iommu_sync_sg_for_device
- * @dev: valid struct device pointer
- * @sg: list of buffers
- * @nents: number of buffers to map (returned from dma_map_sg)
- * @dir: DMA transfer direction (same as was passed to dma_map_sg)
- */
-static void arm_iommu_sync_sg_for_device(struct device *dev,
- struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
-{
- struct scatterlist *s;
- int i;
-
- if (dev->dma_coherent)
- return;
-
- for_each_sg(sg, s, nents, i)
- __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir);
-}
-
-/**
- * arm_iommu_map_page
- * @dev: valid struct device pointer
- * @page: page that buffer resides in
- * @offset: offset into page for start of buffer
- * @size: size of buffer to map
- * @dir: DMA transfer direction
- *
- * IOMMU aware version of arm_dma_map_page()
- */
-static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
- dma_addr_t dma_addr;
- int ret, prot, len = PAGE_ALIGN(size + offset);
-
- if (!dev->dma_coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- __dma_page_cpu_to_dev(page, offset, size, dir);
-
- dma_addr = __alloc_iova(mapping, len);
- if (dma_addr == DMA_MAPPING_ERROR)
- return dma_addr;
-
- prot = __dma_info_to_prot(dir, attrs);
-
- ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, prot);
- if (ret < 0)
- goto fail;
-
- return dma_addr + offset;
-fail:
- __free_iova(mapping, dma_addr, len);
- return DMA_MAPPING_ERROR;
-}
-
-/**
- * arm_iommu_unmap_page
- * @dev: valid struct device pointer
- * @handle: DMA address of buffer
- * @size: size of buffer (same as passed to dma_map_page)
- * @dir: DMA transfer direction (same as passed to dma_map_page)
- *
- * IOMMU aware version of arm_dma_unmap_page()
- */
-static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir, unsigned long attrs)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
- dma_addr_t iova = handle & PAGE_MASK;
- struct page *page;
- int offset = handle & ~PAGE_MASK;
- int len = PAGE_ALIGN(size + offset);
-
- if (!iova)
- return;
-
- if (!dev->dma_coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) {
- page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
- __dma_page_dev_to_cpu(page, offset, size, dir);
- }
-
- iommu_unmap(mapping->domain, iova, len);
- __free_iova(mapping, iova, len);
-}
-
-/**
- * arm_iommu_map_resource - map a device resource for DMA
- * @dev: valid struct device pointer
- * @phys_addr: physical address of resource
- * @size: size of resource to map
- * @dir: DMA transfer direction
- */
-static dma_addr_t arm_iommu_map_resource(struct device *dev,
- phys_addr_t phys_addr, size_t size,
- enum dma_data_direction dir, unsigned long attrs)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
- dma_addr_t dma_addr;
- int ret, prot;
- phys_addr_t addr = phys_addr & PAGE_MASK;
- unsigned int offset = phys_addr & ~PAGE_MASK;
- size_t len = PAGE_ALIGN(size + offset);
-
- dma_addr = __alloc_iova(mapping, len);
- if (dma_addr == DMA_MAPPING_ERROR)
- return dma_addr;
-
- prot = __dma_info_to_prot(dir, attrs) | IOMMU_MMIO;
-
- ret = iommu_map(mapping->domain, dma_addr, addr, len, prot);
- if (ret < 0)
- goto fail;
-
- return dma_addr + offset;
-fail:
- __free_iova(mapping, dma_addr, len);
- return DMA_MAPPING_ERROR;
-}
-
-/**
- * arm_iommu_unmap_resource - unmap a device DMA resource
- * @dev: valid struct device pointer
- * @dma_handle: DMA address to resource
- * @size: size of resource to map
- * @dir: DMA transfer direction
- */
-static void arm_iommu_unmap_resource(struct device *dev, dma_addr_t dma_handle,
- size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
- dma_addr_t iova = dma_handle & PAGE_MASK;
- unsigned int offset = dma_handle & ~PAGE_MASK;
- size_t len = PAGE_ALIGN(size + offset);
-
- if (!iova)
- return;
-
- iommu_unmap(mapping->domain, iova, len);
- __free_iova(mapping, iova, len);
-}
-
-static void arm_iommu_sync_single_for_cpu(struct device *dev,
- dma_addr_t handle, size_t size, enum dma_data_direction dir)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
- dma_addr_t iova = handle & PAGE_MASK;
- struct page *page;
- unsigned int offset = handle & ~PAGE_MASK;
-
- if (dev->dma_coherent || !iova)
- return;
-
- page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
- __dma_page_dev_to_cpu(page, offset, size, dir);
-}
-
-static void arm_iommu_sync_single_for_device(struct device *dev,
- dma_addr_t handle, size_t size, enum dma_data_direction dir)
-{
- struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
- dma_addr_t iova = handle & PAGE_MASK;
- struct page *page;
- unsigned int offset = handle & ~PAGE_MASK;
-
- if (dev->dma_coherent || !iova)
- return;
-
- page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));
- __dma_page_cpu_to_dev(page, offset, size, dir);
-}
-
-static const struct dma_map_ops iommu_ops = {
- .alloc = arm_iommu_alloc_attrs,
- .free = arm_iommu_free_attrs,
- .mmap = arm_iommu_mmap_attrs,
- .get_sgtable = arm_iommu_get_sgtable,
-
- .map_page = arm_iommu_map_page,
- .unmap_page = arm_iommu_unmap_page,
- .sync_single_for_cpu = arm_iommu_sync_single_for_cpu,
- .sync_single_for_device = arm_iommu_sync_single_for_device,
-
- .map_sg = arm_iommu_map_sg,
- .unmap_sg = arm_iommu_unmap_sg,
- .sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu,
- .sync_sg_for_device = arm_iommu_sync_sg_for_device,
-
- .map_resource = arm_iommu_map_resource,
- .unmap_resource = arm_iommu_unmap_resource,
-};
-
+extern const struct dma_map_ops iommu_dma_ops;
+extern int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
+ u64 size, struct device *dev);
/**
* arm_iommu_create_mapping
* @bus: pointer to the bus holding the client device (for IOMMU calls)
@@ -1896,55 +1094,31 @@ static const struct dma_map_ops iommu_ops = {
struct dma_iommu_mapping *
arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size)
{
- unsigned int bits = size >> PAGE_SHIFT;
- unsigned int bitmap_size = BITS_TO_LONGS(bits) * sizeof(long);
struct dma_iommu_mapping *mapping;
- int extensions = 1;
int err = -ENOMEM;

- /* currently only 32-bit DMA address space is supported */
- if (size > DMA_BIT_MASK(32) + 1)
- return ERR_PTR(-ERANGE);
-
- if (!bitmap_size)
- return ERR_PTR(-EINVAL);
-
- if (bitmap_size > PAGE_SIZE) {
- extensions = bitmap_size / PAGE_SIZE;
- bitmap_size = PAGE_SIZE;
- }
-
- mapping = kzalloc(sizeof(struct dma_iommu_mapping), GFP_KERNEL);
+ mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
if (!mapping)
goto err;

- mapping->bitmap_size = bitmap_size;
- mapping->bitmaps = kcalloc(extensions, sizeof(unsigned long *),
- GFP_KERNEL);
- if (!mapping->bitmaps)
- goto err2;
-
- mapping->bitmaps[0] = kzalloc(bitmap_size, GFP_KERNEL);
- if (!mapping->bitmaps[0])
- goto err3;
-
- mapping->nr_bitmaps = 1;
- mapping->extensions = extensions;
- mapping->base = base;
- mapping->bits = BITS_PER_BYTE * bitmap_size;
-
- spin_lock_init(&mapping->lock);
-
mapping->domain = iommu_domain_alloc(bus);
if (!mapping->domain)
+ goto err2;
+
+ err = iommu_get_dma_cookie(mapping->domain);
+ if (err)
+ goto err3;
+
+ err = iommu_dma_init_domain(mapping->domain, base, size, NULL);
+ if (err)
goto err4;

kref_init(&mapping->kref);
return mapping;
err4:
- kfree(mapping->bitmaps[0]);
+ iommu_put_dma_cookie(mapping->domain);
err3:
- kfree(mapping->bitmaps);
+ iommu_domain_free(mapping->domain);
err2:
kfree(mapping);
err:
@@ -1954,35 +1128,14 @@ EXPORT_SYMBOL_GPL(arm_iommu_create_mapping);

static void release_iommu_mapping(struct kref *kref)
{
- int i;
struct dma_iommu_mapping *mapping =
container_of(kref, struct dma_iommu_mapping, kref);

+ iommu_put_dma_cookie(mapping->domain);
iommu_domain_free(mapping->domain);
- for (i = 0; i < mapping->nr_bitmaps; i++)
- kfree(mapping->bitmaps[i]);
- kfree(mapping->bitmaps);
kfree(mapping);
}

-static int extend_iommu_mapping(struct dma_iommu_mapping *mapping)
-{
- int next_bitmap;
-
- if (mapping->nr_bitmaps >= mapping->extensions)
- return -EINVAL;
-
- next_bitmap = mapping->nr_bitmaps;
- mapping->bitmaps[next_bitmap] = kzalloc(mapping->bitmap_size,
- GFP_ATOMIC);
- if (!mapping->bitmaps[next_bitmap])
- return -ENOMEM;
-
- mapping->nr_bitmaps++;
-
- return 0;
-}
-
void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping)
{
if (mapping)
@@ -2028,7 +1181,7 @@ int arm_iommu_attach_device(struct device *dev,
if (err)
return err;

- set_dma_ops(dev, &iommu_ops);
+ set_dma_ops(dev, &iommu_dma_ops);
return 0;
}
EXPORT_SYMBOL_GPL(arm_iommu_attach_device);
@@ -2126,7 +1279,7 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
return;

if (arm_setup_iommu_dma_ops(dev, dma_base, size, iommu))
- dma_ops = &iommu_ops;
+ dma_ops = &iommu_dma_ops;
else
dma_ops = arm_get_dma_map_ops(coherent);

@@ -2149,7 +1302,7 @@ void arch_teardown_dma_ops(struct device *dev)
set_dma_ops(dev, NULL);
}

-#if defined(CONFIG_SWIOTLB) || defined(CONFIG_ARM_DMA_USE_IOMMU)
+#if defined(CONFIG_SWIOTLB) || defined(CONFIG_IOMMU_DMA)
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
{
@@ -2177,4 +1330,4 @@ void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
{
__arm_dma_free(dev, size, cpu_addr, dma_handle, attrs, false);
}
-#endif /* CONFIG_SWIOTLB || CONFIG_ARM_DMA_USE_IOMMU */
+#endif /* CONFIG_SWIOTLB || CONFIG_IOMMU_DMA */
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index bef5d75e306b..ca0bdf826e9d 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -163,7 +163,6 @@ config ROCKCHIP_IOMMU
bool "Rockchip IOMMU Support"
depends on ARCH_ROCKCHIP || COMPILE_TEST
select IOMMU_API
- select ARM_DMA_USE_IOMMU
help
Support for IOMMUs found on Rockchip rk32xx SOCs.
These IOMMUs allow virtualization of the address space used by most
@@ -175,7 +174,6 @@ config SUN50I_IOMMU
bool "Allwinner H6 IOMMU Support"
depends on HAS_DMA
depends on ARCH_SUNXI || COMPILE_TEST
- select ARM_DMA_USE_IOMMU
select IOMMU_API
help
Support for the IOMMU introduced in the Allwinner H6 SoCs.
@@ -206,7 +204,6 @@ config EXYNOS_IOMMU
depends on ARCH_EXYNOS || COMPILE_TEST
depends on !CPU_BIG_ENDIAN # revisit driver if we can enable big-endian ptes
select IOMMU_API
- select ARM_DMA_USE_IOMMU
help
Support for the IOMMU (System MMU) of Samsung Exynos application
processor family. This enables H/W multimedia accelerators to see
@@ -229,7 +226,6 @@ config IPMMU_VMSA
depends on ARCH_RENESAS || (COMPILE_TEST && !GENERIC_ATOMIC64)
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
- select ARM_DMA_USE_IOMMU
help
Support for the Renesas VMSA-compatible IPMMU found in the R-Mobile
APE6, R-Car Gen2, and R-Car Gen3 SoCs.
@@ -250,7 +246,6 @@ config ARM_SMMU
depends on ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
- select ARM_DMA_USE_IOMMU if ARM
help
Support for implementations of the ARM System MMU architecture
versions 1 and 2.
@@ -334,7 +329,6 @@ config S390_AP_IOMMU
config MTK_IOMMU
bool "MTK IOMMU Support"
depends on ARCH_MEDIATEK || COMPILE_TEST
- select ARM_DMA_USE_IOMMU
select IOMMU_API
select IOMMU_IO_PGTABLE_ARMV7S
select MEMORY
@@ -350,7 +344,6 @@ config MTK_IOMMU_V1
bool "MTK IOMMU Version 1 (M4U gen1) Support"
depends on ARM
depends on ARCH_MEDIATEK || COMPILE_TEST
- select ARM_DMA_USE_IOMMU
select IOMMU_API
select MEMORY
select MTK_SMI
@@ -367,7 +360,6 @@ config QCOM_IOMMU
depends on ARCH_QCOM || (COMPILE_TEST && !GENERIC_ATOMIC64)
select IOMMU_API
select IOMMU_IO_PGTABLE_LPAE
- select ARM_DMA_USE_IOMMU
help
Support for IOMMU on certain Qualcomm SoCs.

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index c57ee78fa99d..9d6ff7b5f7f1 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -76,7 +76,6 @@ config VIDEO_OMAP3
depends on VIDEO_V4L2 && I2C
depends on (ARCH_OMAP3 && OMAP_IOMMU) || COMPILE_TEST
depends on COMMON_CLK && OF
- select ARM_DMA_USE_IOMMU if OMAP_IOMMU
select MEDIA_CONTROLLER
select VIDEO_V4L2_SUBDEV_API
select VIDEOBUF2_DMA_CONTIG
--
2.28.0.dirty