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iommu/dma: move the arm64 wrappers to common code

Browse source 
There is nothing really arm64 specific in the iommu_dma_ops
implementation, so move it to dma-iommu.c and keep a lot of symbols
self-contained.  Note the implementation does depend on the
DMA_DIRECT_REMAP infrastructure for now, so we'll have to make the
DMA_IOMMU support depend on it, but this will be relaxed soon.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Christoph Hellwig 2019-05-20 09:29:29 +02:00 committed by Joerg Roedel
parent 23f88e0a7e
commit 06d60728ff
4 changed files with 378 additions and 457 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

394
arch/arm64/mm/dma-mapping.c
View file

@ -27,6 +27,7 @@
#include <linux/dma-direct.h>
#include <linux/dma-noncoherent.h>
#include <linux/dma-contiguous.h>
#include <linux/dma-iommu.h>
#include <linux/vmalloc.h>
#include <linux/swiotlb.h>
#include <linux/pci.h>
@ -58,37 +59,6 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
__dma_flush_area(page_address(page), size);
}
#ifdef CONFIG_IOMMU_DMA
static int __swiotlb_get_sgtable_page(struct sg_table *sgt,
struct page *page, size_t size)
{
int ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
if (!ret)
sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
return ret;
}
static int __swiotlb_mmap_pfn(struct vm_area_struct *vma,
unsigned long pfn, size_t size)
{
int ret = -ENXIO;
unsigned long nr_vma_pages = vma_pages(vma);
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
ret = remap_pfn_range(vma, vma->vm_start,
pfn + off,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
return ret;
}
#endif /* CONFIG_IOMMU_DMA */
static int __init arm64_dma_init(void)
{
WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(),
@ -100,374 +70,18 @@ static int __init arm64_dma_init(void)
arch_initcall(arm64_dma_init);
#ifdef CONFIG_IOMMU_DMA
#include <linux/dma-iommu.h>
#include <linux/platform_device.h>
#include <linux/amba/bus.h>
static void *__iommu_alloc_attrs(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp,
unsigned long attrs)
{
bool coherent = dev_is_dma_coherent(dev);
int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
size_t iosize = size;
void *addr;
if (WARN(!dev, "cannot create IOMMU mapping for unknown device\n"))
return NULL;
size = PAGE_ALIGN(size);
/*
* Some drivers rely on this, and we probably don't want the
* possibility of stale kernel data being read by devices anyway.
*/
gfp |= __GFP_ZERO;
if (!gfpflags_allow_blocking(gfp)) {
struct page *page;
/*
* In atomic context we can't remap anything, so we'll only
* get the virtually contiguous buffer we need by way of a
* physically contiguous allocation.
*/
if (coherent) {
page = alloc_pages(gfp, get_order(size));
addr = page ? page_address(page) : NULL;
} else {
addr = dma_alloc_from_pool(size, &page, gfp);
}
if (!addr)
return NULL;
*handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot);
if (*handle == DMA_MAPPING_ERROR) {
if (coherent)
__free_pages(page, get_order(size));
else
dma_free_from_pool(addr, size);
addr = NULL;
}
} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
struct page *page;
page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
get_order(size), gfp & __GFP_NOWARN);
if (!page)
return NULL;
*handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot);
if (*handle == DMA_MAPPING_ERROR) {
dma_release_from_contiguous(dev, page,
size >> PAGE_SHIFT);
return NULL;
}
addr = dma_common_contiguous_remap(page, size, VM_USERMAP,
prot,
__builtin_return_address(0));
if (addr) {
if (!coherent)
__dma_flush_area(page_to_virt(page), iosize);
memset(addr, 0, size);
} else {
iommu_dma_unmap_page(dev, *handle, iosize, 0, attrs);
dma_release_from_contiguous(dev, page,
size >> PAGE_SHIFT);
}
} else {
pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
struct page **pages;
pages = iommu_dma_alloc(dev, iosize, gfp, attrs, ioprot,
handle);
if (!pages)
return NULL;
addr = dma_common_pages_remap(pages, size, VM_USERMAP, prot,
__builtin_return_address(0));
if (!addr)
iommu_dma_free(dev, pages, iosize, handle);
}
return addr;
}
static void __iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t handle, unsigned long attrs)
{
size_t iosize = size;
size = PAGE_ALIGN(size);
/*
* @cpu_addr will be one of 4 things depending on how it was allocated:
* - A remapped array of pages for contiguous allocations.
* - A remapped array of pages from iommu_dma_alloc(), for all
* non-atomic allocations.
* - A non-cacheable alias from the atomic pool, for atomic
* allocations by non-coherent devices.
* - A normal lowmem address, for atomic allocations by
* coherent devices.
* Hence how dodgy the below logic looks...
*/
if (dma_in_atomic_pool(cpu_addr, size)) {
iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
dma_free_from_pool(cpu_addr, size);
} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
struct page *page = vmalloc_to_page(cpu_addr);
iommu_dma_unmap_page(dev, handle, iosize, 0, attrs);
dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT);
dma_common_free_remap(cpu_addr, size, VM_USERMAP);
} else if (is_vmalloc_addr(cpu_addr)){
struct vm_struct *area = find_vm_area(cpu_addr);
if (WARN_ON(!area || !area->pages))
return;
iommu_dma_free(dev, area->pages, iosize, &handle);
dma_common_free_remap(cpu_addr, size, VM_USERMAP);
} else {
iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
__free_pages(virt_to_page(cpu_addr), get_order(size));
}
}
static int __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 vm_struct *area;
int ret;
vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs);
if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
return ret;
if (!is_vmalloc_addr(cpu_addr)) {
unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr));
return __swiotlb_mmap_pfn(vma, pfn, size);
}
if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
/*
* DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped,
* hence in the vmalloc space.
*/
unsigned long pfn = vmalloc_to_pfn(cpu_addr);
return __swiotlb_mmap_pfn(vma, pfn, size);
}
area = find_vm_area(cpu_addr);
if (WARN_ON(!area || !area->pages))
return -ENXIO;
return iommu_dma_mmap(area->pages, size, vma);
}
static int __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 vm_struct *area = find_vm_area(cpu_addr);
if (!is_vmalloc_addr(cpu_addr)) {
struct page *page = virt_to_page(cpu_addr);
return __swiotlb_get_sgtable_page(sgt, page, size);
}
if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
/*
* DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped,
* hence in the vmalloc space.
*/
struct page *page = vmalloc_to_page(cpu_addr);
return __swiotlb_get_sgtable_page(sgt, page, size);
}
if (WARN_ON(!area || !area->pages))
return -ENXIO;
return sg_alloc_table_from_pages(sgt, area->pages, count, 0, size,
GFP_KERNEL);
}
static void __iommu_sync_single_for_cpu(struct device *dev,
dma_addr_t dev_addr, size_t size,
enum dma_data_direction dir)
{
phys_addr_t phys;
if (dev_is_dma_coherent(dev))
return;
phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dev_addr);
arch_sync_dma_for_cpu(dev, phys, size, dir);
}
static void __iommu_sync_single_for_device(struct device *dev,
dma_addr_t dev_addr, size_t size,
enum dma_data_direction dir)
{
phys_addr_t phys;
if (dev_is_dma_coherent(dev))
return;
phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dev_addr);
arch_sync_dma_for_device(dev, phys, size, dir);
}
static dma_addr_t __iommu_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
unsigned long attrs)
{
bool coherent = dev_is_dma_coherent(dev);
int prot = dma_info_to_prot(dir, coherent, attrs);
dma_addr_t dev_addr = iommu_dma_map_page(dev, page, offset, size, prot);
if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
dev_addr != DMA_MAPPING_ERROR)
__dma_map_area(page_address(page) + offset, size, dir);
return dev_addr;
}
static void __iommu_unmap_page(struct device *dev, dma_addr_t dev_addr,
size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
__iommu_sync_single_for_cpu(dev, dev_addr, size, dir);
iommu_dma_unmap_page(dev, dev_addr, size, dir, attrs);
}
static void __iommu_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir)
{
struct scatterlist *sg;
int i;
if (dev_is_dma_coherent(dev))
return;
for_each_sg(sgl, sg, nelems, i)
arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
}
static void __iommu_sync_sg_for_device(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir)
{
struct scatterlist *sg;
int i;
if (dev_is_dma_coherent(dev))
return;
for_each_sg(sgl, sg, nelems, i)
arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir);
}
static int __iommu_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
unsigned long attrs)
{
bool coherent = dev_is_dma_coherent(dev);
if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
__iommu_sync_sg_for_device(dev, sgl, nelems, dir);
return iommu_dma_map_sg(dev, sgl, nelems,
dma_info_to_prot(dir, coherent, attrs));
}
static void __iommu_unmap_sg_attrs(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir,
unsigned long attrs)
{
if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
__iommu_sync_sg_for_cpu(dev, sgl, nelems, dir);
iommu_dma_unmap_sg(dev, sgl, nelems, dir, attrs);
}
static const struct dma_map_ops iommu_dma_ops = {
.alloc = __iommu_alloc_attrs,
.free = __iommu_free_attrs,
.mmap = __iommu_mmap_attrs,
.get_sgtable = __iommu_get_sgtable,
.map_page = __iommu_map_page,
.unmap_page = __iommu_unmap_page,
.map_sg = __iommu_map_sg_attrs,
.unmap_sg = __iommu_unmap_sg_attrs,
.sync_single_for_cpu = __iommu_sync_single_for_cpu,
.sync_single_for_device = __iommu_sync_single_for_device,
.sync_sg_for_cpu = __iommu_sync_sg_for_cpu,
.sync_sg_for_device = __iommu_sync_sg_for_device,
.map_resource = iommu_dma_map_resource,
.unmap_resource = iommu_dma_unmap_resource,
};
static int __init __iommu_dma_init(void)
{
return iommu_dma_init();
}
arch_initcall(__iommu_dma_init);
static void __iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
const struct iommu_ops *ops)
{
struct iommu_domain *domain;
if (!ops)
return;
/*
* The IOMMU core code allocates the default DMA domain, which the
* underlying IOMMU driver needs to support via the dma-iommu layer.
*/
domain = iommu_get_domain_for_dev(dev);
if (!domain)
goto out_err;
if (domain->type == IOMMU_DOMAIN_DMA) {
if (iommu_dma_init_domain(domain, dma_base, size, dev))
goto out_err;
dev->dma_ops = &iommu_dma_ops;
}
return;
out_err:
pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
dev_name(dev));
}
void arch_teardown_dma_ops(struct device *dev)
{
dev->dma_ops = NULL;
}
#else
static void __iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
const struct iommu_ops *iommu)
{ }
#endif /* CONFIG_IOMMU_DMA */
#endif
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
const struct iommu_ops *iommu, bool coherent)
{
dev->dma_coherent = coherent;
__iommu_setup_dma_ops(dev, dma_base, size, iommu);
if (iommu)
iommu_setup_dma_ops(dev, dma_base, size);
#ifdef CONFIG_XEN
if (xen_initial_domain())

1
drivers/iommu/Kconfig
View file

@ -97,6 +97,7 @@ config IOMMU_DMA
select IOMMU_IOVA
select IRQ_MSI_IOMMU
select NEED_SG_DMA_LENGTH
depends on DMA_DIRECT_REMAP
config FSL_PAMU
bool "Freescale IOMMU support"

398
drivers/iommu/dma-iommu.c
View file

@ -21,6 +21,7 @@
#include <linux/acpi_iort.h>
#include <linux/device.h>
#include <linux/dma-contiguous.h>
#include <linux/dma-iommu.h>
#include <linux/dma-noncoherent.h>
#include <linux/gfp.h>
@ -79,11 +80,6 @@ static struct iommu_dma_cookie *cookie_alloc(enum iommu_dma_cookie_type type)
return cookie;
}
int iommu_dma_init(void)
{
return iova_cache_get();
}
/**
* iommu_get_dma_cookie - Acquire DMA-API resources for a domain
* @domain: IOMMU domain to prepare for DMA-API usage
@ -314,7 +310,7 @@ static void iommu_dma_flush_iotlb_all(struct iova_domain *iovad)
* to ensure it is an invalid IOVA. It is safe to reinitialise a domain, but
* any change which could make prior IOVAs invalid will fail.
*/
int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
u64 size, struct device *dev)
{
struct iommu_dma_cookie *cookie = domain->iova_cookie;
@ -365,7 +361,6 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
return iova_reserve_iommu_regions(dev, domain);
}
EXPORT_SYMBOL(iommu_dma_init_domain);
/**
* dma_info_to_prot - Translate DMA API directions and attributes to IOMMU API
@ -376,7 +371,7 @@ EXPORT_SYMBOL(iommu_dma_init_domain);
*
* Return: corresponding IOMMU API page protection flags
*/
int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
static int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
unsigned long attrs)
{
int prot = coherent ? IOMMU_CACHE : 0;
@ -535,17 +530,17 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
}
/**
* iommu_dma_free - Free a buffer allocated by iommu_dma_alloc()
* iommu_dma_free - Free a buffer allocated by __iommu_dma_alloc()
* @dev: Device which owns this buffer
* @pages: Array of buffer pages as returned by iommu_dma_alloc()
* @pages: Array of buffer pages as returned by __iommu_dma_alloc()
* @size: Size of buffer in bytes
* @handle: DMA address of buffer
*
* Frees both the pages associated with the buffer, and the array
* describing them
*/
void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
dma_addr_t *handle)
static void __iommu_dma_free(struct device *dev, struct page **pages,
size_t size, dma_addr_t *handle)
{
__iommu_dma_unmap(iommu_get_dma_domain(dev), *handle, size);
__iommu_dma_free_pages(pages, PAGE_ALIGN(size) >> PAGE_SHIFT);
@ -553,7 +548,7 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
}
/**
* iommu_dma_alloc - Allocate and map a buffer contiguous in IOVA space
* __iommu_dma_alloc - Allocate and map a buffer contiguous in IOVA space
* @dev: Device to allocate memory for. Must be a real device
* attached to an iommu_dma_domain
* @size: Size of buffer in bytes
@ -568,8 +563,8 @@ void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
* Return: Array of struct page pointers describing the buffer,
* or NULL on failure.
*/
struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
unsigned long attrs, int prot, dma_addr_t *handle)
static struct page **__iommu_dma_alloc(struct device *dev, size_t size,
gfp_t gfp, unsigned long attrs, int prot, dma_addr_t *handle)
{
struct iommu_domain *domain = iommu_get_dma_domain(dev);
struct iommu_dma_cookie *cookie = domain->iova_cookie;
@ -631,20 +626,72 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
}
/**
* iommu_dma_mmap - Map a buffer into provided user VMA
* @pages: Array representing buffer from iommu_dma_alloc()
* __iommu_dma_mmap - Map a buffer into provided user VMA
* @pages: Array representing buffer from __iommu_dma_alloc()
* @size: Size of buffer in bytes
* @vma: VMA describing requested userspace mapping
*
* Maps the pages of the buffer in @pages into @vma. The caller is responsible
* for verifying the correct size and protection of @vma beforehand.
*/
int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma)
static int __iommu_dma_mmap(struct page **pages, size_t size,
struct vm_area_struct *vma)
{
return vm_map_pages(vma, pages, PAGE_ALIGN(size) >> PAGE_SHIFT);
}
static void iommu_dma_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
{
phys_addr_t phys;
if (dev_is_dma_coherent(dev))
return;
phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
arch_sync_dma_for_cpu(dev, phys, size, dir);
}
static void iommu_dma_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
{
phys_addr_t phys;
if (dev_is_dma_coherent(dev))
return;
phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle);
arch_sync_dma_for_device(dev, phys, size, dir);
}
static void iommu_dma_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir)
{
struct scatterlist *sg;
int i;
if (dev_is_dma_coherent(dev))
return;
for_each_sg(sgl, sg, nelems, i)
arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
}
static void iommu_dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sgl, int nelems,
enum dma_data_direction dir)
{
struct scatterlist *sg;
int i;
if (dev_is_dma_coherent(dev))
return;
for_each_sg(sgl, sg, nelems, i)
arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir);
}
static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
size_t size, int prot, struct iommu_domain *domain)
{
@ -668,19 +715,44 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
return iova + iova_off;
}
dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
static dma_addr_t __iommu_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, int prot)
{
return __iommu_dma_map(dev, page_to_phys(page) + offset, size, prot,
iommu_get_dma_domain(dev));
}
void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
enum dma_data_direction dir, unsigned long attrs)
static void __iommu_dma_unmap_page(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
__iommu_dma_unmap(iommu_get_dma_domain(dev), handle, size);
}
static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
phys_addr_t phys = page_to_phys(page) + offset;
bool coherent = dev_is_dma_coherent(dev);
dma_addr_t dma_handle;
dma_handle =__iommu_dma_map(dev, phys, size,
dma_info_to_prot(dir, coherent, attrs),
iommu_get_dma_domain(dev));
if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
dma_handle != DMA_MAPPING_ERROR)
arch_sync_dma_for_device(dev, phys, size, dir);
return dma_handle;
}
static void iommu_dma_unmap_page(struct device *dev, dma_addr_t dma_handle,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
iommu_dma_sync_single_for_cpu(dev, dma_handle, size, dir);
__iommu_dma_unmap(iommu_get_dma_domain(dev), dma_handle, size);
}
/*
* Prepare a successfully-mapped scatterlist to give back to the caller.
*
@ -763,18 +835,22 @@ static void __invalidate_sg(struct scatterlist *sg, int nents)
* impedance-matching, to be able to hand off a suitably-aligned list,
* but still preserve the original offsets and sizes for the caller.
*/
int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, int prot)
static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
struct iommu_domain *domain = iommu_get_dma_domain(dev);
struct iommu_dma_cookie *cookie = domain->iova_cookie;
struct iova_domain *iovad = &cookie->iovad;
struct scatterlist *s, *prev = NULL;
int prot = dma_info_to_prot(dir, dev_is_dma_coherent(dev), attrs);
dma_addr_t iova;
size_t iova_len = 0;
unsigned long mask = dma_get_seg_boundary(dev);
int i;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
iommu_dma_sync_sg_for_device(dev, sg, nents, dir);
/*
* Work out how much IOVA space we need, and align the segments to
* IOVA granules for the IOMMU driver to handle. With some clever
@ -834,12 +910,16 @@ int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
return 0;
}
void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir, unsigned long attrs)
static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
dma_addr_t start, end;
struct scatterlist *tmp;
int i;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
iommu_dma_sync_sg_for_cpu(dev, sg, nents, dir);
/*
* The scatterlist segments are mapped into a single
* contiguous IOVA allocation, so this is incredibly easy.
@ -854,7 +934,7 @@ void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
__iommu_dma_unmap(iommu_get_dma_domain(dev), start, end - start);
}
dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
static dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
return __iommu_dma_map(dev, phys, size,
@ -862,12 +942,268 @@ dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
iommu_get_dma_domain(dev));
}
void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
static void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
__iommu_dma_unmap(iommu_get_dma_domain(dev), handle, size);
}
static void *iommu_dma_alloc(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
{
bool coherent = dev_is_dma_coherent(dev);
int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
size_t iosize = size;
void *addr;
size = PAGE_ALIGN(size);
gfp |= __GFP_ZERO;
if (!gfpflags_allow_blocking(gfp)) {
struct page *page;
/*
* In atomic context we can't remap anything, so we'll only
* get the virtually contiguous buffer we need by way of a
* physically contiguous allocation.
*/
if (coherent) {
page = alloc_pages(gfp, get_order(size));
addr = page ? page_address(page) : NULL;
} else {
addr = dma_alloc_from_pool(size, &page, gfp);
}
if (!addr)
return NULL;
*handle = __iommu_dma_map_page(dev, page, 0, iosize, ioprot);
if (*handle == DMA_MAPPING_ERROR) {
if (coherent)
__free_pages(page, get_order(size));
else
dma_free_from_pool(addr, size);
addr = NULL;
}
} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
struct page *page;
page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
get_order(size), gfp & __GFP_NOWARN);
if (!page)
return NULL;
*handle = __iommu_dma_map_page(dev, page, 0, iosize, ioprot);
if (*handle == DMA_MAPPING_ERROR) {
dma_release_from_contiguous(dev, page,
size >> PAGE_SHIFT);
return NULL;
}
addr = dma_common_contiguous_remap(page, size, VM_USERMAP,
prot,
__builtin_return_address(0));
if (addr) {
if (!coherent)
arch_dma_prep_coherent(page, iosize);
memset(addr, 0, size);
} else {
__iommu_dma_unmap_page(dev, *handle, iosize, 0, attrs);
dma_release_from_contiguous(dev, page,
size >> PAGE_SHIFT);
}
} else {
pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
struct page **pages;
pages = __iommu_dma_alloc(dev, iosize, gfp, attrs, ioprot,
handle);
if (!pages)
return NULL;
addr = dma_common_pages_remap(pages, size, VM_USERMAP, prot,
__builtin_return_address(0));
if (!addr)
__iommu_dma_free(dev, pages, iosize, handle);
}
return addr;
}
static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t handle, unsigned long attrs)
{
size_t iosize = size;
size = PAGE_ALIGN(size);
/*
* @cpu_addr will be one of 4 things depending on how it was allocated:
* - A remapped array of pages for contiguous allocations.
* - A remapped array of pages from __iommu_dma_alloc(), for all
* non-atomic allocations.
* - A non-cacheable alias from the atomic pool, for atomic
* allocations by non-coherent devices.
* - A normal lowmem address, for atomic allocations by
* coherent devices.
* Hence how dodgy the below logic looks...
*/
if (dma_in_atomic_pool(cpu_addr, size)) {
__iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
dma_free_from_pool(cpu_addr, size);
} else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
struct page *page = vmalloc_to_page(cpu_addr);
__iommu_dma_unmap_page(dev, handle, iosize, 0, attrs);
dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT);
dma_common_free_remap(cpu_addr, size, VM_USERMAP);
} else if (is_vmalloc_addr(cpu_addr)){
struct vm_struct *area = find_vm_area(cpu_addr);
if (WARN_ON(!area || !area->pages))
return;
__iommu_dma_free(dev, area->pages, iosize, &handle);
dma_common_free_remap(cpu_addr, size, VM_USERMAP);
} else {
__iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
__free_pages(virt_to_page(cpu_addr), get_order(size));
}
}
static int __iommu_dma_mmap_pfn(struct vm_area_struct *vma,
unsigned long pfn, size_t size)
{
int ret = -ENXIO;
unsigned long nr_vma_pages = vma_pages(vma);
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
ret = remap_pfn_range(vma, vma->vm_start,
pfn + off,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
return ret;
}
static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
struct vm_struct *area;
int ret;
vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs);
if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
return ret;
if (off >= nr_pages || vma_pages(vma) > nr_pages - off)
return -ENXIO;
if (!is_vmalloc_addr(cpu_addr)) {
unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr));
return __iommu_dma_mmap_pfn(vma, pfn, size);
}
if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
/*
* DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped,
* hence in the vmalloc space.
*/
unsigned long pfn = vmalloc_to_pfn(cpu_addr);
return __iommu_dma_mmap_pfn(vma, pfn, size);
}
area = find_vm_area(cpu_addr);
if (WARN_ON(!area || !area->pages))
return -ENXIO;
return __iommu_dma_mmap(area->pages, size, vma);
}
static int __iommu_dma_get_sgtable_page(struct sg_table *sgt, struct page *page,
size_t size)
{
int ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
if (!ret)
sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
return ret;
}
static int iommu_dma_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 vm_struct *area = find_vm_area(cpu_addr);
if (!is_vmalloc_addr(cpu_addr)) {
struct page *page = virt_to_page(cpu_addr);
return __iommu_dma_get_sgtable_page(sgt, page, size);
}
if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
/*
* DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped,
* hence in the vmalloc space.
*/
struct page *page = vmalloc_to_page(cpu_addr);
return __iommu_dma_get_sgtable_page(sgt, page, size);
}
if (WARN_ON(!area || !area->pages))
return -ENXIO;
return sg_alloc_table_from_pages(sgt, area->pages, count, 0, size,
GFP_KERNEL);
}
static const struct dma_map_ops iommu_dma_ops = {
.alloc = iommu_dma_alloc,
.free = iommu_dma_free,
.mmap = iommu_dma_mmap,
.get_sgtable = iommu_dma_get_sgtable,
.map_page = iommu_dma_map_page,
.unmap_page = iommu_dma_unmap_page,
.map_sg = iommu_dma_map_sg,
.unmap_sg = iommu_dma_unmap_sg,
.sync_single_for_cpu = iommu_dma_sync_single_for_cpu,
.sync_single_for_device = iommu_dma_sync_single_for_device,
.sync_sg_for_cpu = iommu_dma_sync_sg_for_cpu,
.sync_sg_for_device = iommu_dma_sync_sg_for_device,
.map_resource = iommu_dma_map_resource,
.unmap_resource = iommu_dma_unmap_resource,
};
/*
* The IOMMU core code allocates the default DMA domain, which the underlying
* IOMMU driver needs to support via the dma-iommu layer.
*/
void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
if (!domain)
goto out_err;
/*
* The IOMMU core code allocates the default DMA domain, which the
* underlying IOMMU driver needs to support via the dma-iommu layer.
*/
if (domain->type == IOMMU_DOMAIN_DMA) {
if (iommu_dma_init_domain(domain, dma_base, size, dev))
goto out_err;
dev->dma_ops = &iommu_dma_ops;
}
return;
out_err:
pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
dev_name(dev));
}
static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
phys_addr_t msi_addr, struct iommu_domain *domain)
{
@ -948,3 +1284,9 @@ void iommu_dma_compose_msi_msg(struct msi_desc *desc,
msg->address_lo &= cookie_msi_granule(domain->iova_cookie) - 1;
msg->address_lo += lower_32_bits(msi_page->iova);
}
static int iommu_dma_init(void)
{
return iova_cache_get();
}
arch_initcall(iommu_dma_init);

42
include/linux/dma-iommu.h
View file

@ -24,49 +24,13 @@
#include <linux/iommu.h>
#include <linux/msi.h>
int iommu_dma_init(void);
/* Domain management interface for IOMMU drivers */
int iommu_get_dma_cookie(struct iommu_domain *domain);
int iommu_get_msi_cookie(struct iommu_domain *domain, dma_addr_t base);
void iommu_put_dma_cookie(struct iommu_domain *domain);
/* Setup call for arch DMA mapping code */
int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
u64 size, struct device *dev);
/* General helpers for DMA-API <-> IOMMU-API interaction */
int dma_info_to_prot(enum dma_data_direction dir, bool coherent,
unsigned long attrs);
/*
* These implement the bulk of the relevant DMA mapping callbacks, but require
* the arch code to take care of attributes and cache maintenance
*/
struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
unsigned long attrs, int prot, dma_addr_t *handle);
void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
dma_addr_t *handle);
int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma);
dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, int prot);
int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, int prot);
/*
* Arch code with no special attribute handling may use these
* directly as DMA mapping callbacks for simplicity
*/
void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
enum dma_data_direction dir, unsigned long attrs);
void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction dir, unsigned long attrs);
dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys,
size_t size, enum dma_data_direction dir, unsigned long attrs);
void iommu_dma_unmap_resource(struct device *dev, dma_addr_t handle,
size_t size, enum dma_data_direction dir, unsigned long attrs);
void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size);
/* The DMA API isn't _quite_ the whole story, though... */
/*
@ -91,9 +55,9 @@ struct msi_desc;
struct msi_msg;
struct device;
static inline int iommu_dma_init(void)
static inline void iommu_setup_dma_ops(struct device *dev, u64 dma_base,
u64 size)
{
return 0;
}
static inline int iommu_get_dma_cookie(struct iommu_domain *domain)