linux/kernel/dma/mapping.c
Linus Torvalds 27bc50fc90 - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
linux-next for a couple of months without, to my knowledge, any negative
   reports (or any positive ones, come to that).
 
 - Also the Maple Tree from Liam R.  Howlett.  An overlapping range-based
   tree for vmas.  It it apparently slight more efficient in its own right,
   but is mainly targeted at enabling work to reduce mmap_lock contention.
 
   Liam has identified a number of other tree users in the kernel which
   could be beneficially onverted to mapletrees.
 
   Yu Zhao has identified a hard-to-hit but "easy to fix" lockdep splat
   (https://lkml.kernel.org/r/CAOUHufZabH85CeUN-MEMgL8gJGzJEWUrkiM58JkTbBhh-jew0Q@mail.gmail.com).
   This has yet to be addressed due to Liam's unfortunately timed
   vacation.  He is now back and we'll get this fixed up.
 
 - Dmitry Vyukov introduces KMSAN: the Kernel Memory Sanitizer.  It uses
   clang-generated instrumentation to detect used-unintialized bugs down to
   the single bit level.
 
   KMSAN keeps finding bugs.  New ones, as well as the legacy ones.
 
 - Yang Shi adds a userspace mechanism (madvise) to induce a collapse of
   memory into THPs.
 
 - Zach O'Keefe has expanded Yang Shi's madvise(MADV_COLLAPSE) to support
   file/shmem-backed pages.
 
 - userfaultfd updates from Axel Rasmussen
 
 - zsmalloc cleanups from Alexey Romanov
 
 - cleanups from Miaohe Lin: vmscan, hugetlb_cgroup, hugetlb and memory-failure
 
 - Huang Ying adds enhancements to NUMA balancing memory tiering mode's
   page promotion, with a new way of detecting hot pages.
 
 - memcg updates from Shakeel Butt: charging optimizations and reduced
   memory consumption.
 
 - memcg cleanups from Kairui Song.
 
 - memcg fixes and cleanups from Johannes Weiner.
 
 - Vishal Moola provides more folio conversions
 
 - Zhang Yi removed ll_rw_block() :(
 
 - migration enhancements from Peter Xu
 
 - migration error-path bugfixes from Huang Ying
 
 - Aneesh Kumar added ability for a device driver to alter the memory
   tiering promotion paths.  For optimizations by PMEM drivers, DRM
   drivers, etc.
 
 - vma merging improvements from Jakub Matěn.
 
 - NUMA hinting cleanups from David Hildenbrand.
 
 - xu xin added aditional userspace visibility into KSM merging activity.
 
 - THP & KSM code consolidation from Qi Zheng.
 
 - more folio work from Matthew Wilcox.
 
 - KASAN updates from Andrey Konovalov.
 
 - DAMON cleanups from Kaixu Xia.
 
 - DAMON work from SeongJae Park: fixes, cleanups.
 
 - hugetlb sysfs cleanups from Muchun Song.
 
 - Mike Kravetz fixes locking issues in hugetlbfs and in hugetlb core.
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Merge tag 'mm-stable-2022-10-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Pull MM updates from Andrew Morton:

 - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in
   linux-next for a couple of months without, to my knowledge, any
   negative reports (or any positive ones, come to that).

 - Also the Maple Tree from Liam Howlett. An overlapping range-based
   tree for vmas. It it apparently slightly more efficient in its own
   right, but is mainly targeted at enabling work to reduce mmap_lock
   contention.

   Liam has identified a number of other tree users in the kernel which
   could be beneficially onverted to mapletrees.

   Yu Zhao has identified a hard-to-hit but "easy to fix" lockdep splat
   at [1]. This has yet to be addressed due to Liam's unfortunately
   timed vacation. He is now back and we'll get this fixed up.

 - Dmitry Vyukov introduces KMSAN: the Kernel Memory Sanitizer. It uses
   clang-generated instrumentation to detect used-unintialized bugs down
   to the single bit level.

   KMSAN keeps finding bugs. New ones, as well as the legacy ones.

 - Yang Shi adds a userspace mechanism (madvise) to induce a collapse of
   memory into THPs.

 - Zach O'Keefe has expanded Yang Shi's madvise(MADV_COLLAPSE) to
   support file/shmem-backed pages.

 - userfaultfd updates from Axel Rasmussen

 - zsmalloc cleanups from Alexey Romanov

 - cleanups from Miaohe Lin: vmscan, hugetlb_cgroup, hugetlb and
   memory-failure

 - Huang Ying adds enhancements to NUMA balancing memory tiering mode's
   page promotion, with a new way of detecting hot pages.

 - memcg updates from Shakeel Butt: charging optimizations and reduced
   memory consumption.

 - memcg cleanups from Kairui Song.

 - memcg fixes and cleanups from Johannes Weiner.

 - Vishal Moola provides more folio conversions

 - Zhang Yi removed ll_rw_block() :(

 - migration enhancements from Peter Xu

 - migration error-path bugfixes from Huang Ying

 - Aneesh Kumar added ability for a device driver to alter the memory
   tiering promotion paths. For optimizations by PMEM drivers, DRM
   drivers, etc.

 - vma merging improvements from Jakub Matěn.

 - NUMA hinting cleanups from David Hildenbrand.

 - xu xin added aditional userspace visibility into KSM merging
   activity.

 - THP & KSM code consolidation from Qi Zheng.

 - more folio work from Matthew Wilcox.

 - KASAN updates from Andrey Konovalov.

 - DAMON cleanups from Kaixu Xia.

 - DAMON work from SeongJae Park: fixes, cleanups.

 - hugetlb sysfs cleanups from Muchun Song.

 - Mike Kravetz fixes locking issues in hugetlbfs and in hugetlb core.

Link: https://lkml.kernel.org/r/CAOUHufZabH85CeUN-MEMgL8gJGzJEWUrkiM58JkTbBhh-jew0Q@mail.gmail.com [1]

* tag 'mm-stable-2022-10-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (555 commits)
  hugetlb: allocate vma lock for all sharable vmas
  hugetlb: take hugetlb vma_lock when clearing vma_lock->vma pointer
  hugetlb: fix vma lock handling during split vma and range unmapping
  mglru: mm/vmscan.c: fix imprecise comments
  mm/mglru: don't sync disk for each aging cycle
  mm: memcontrol: drop dead CONFIG_MEMCG_SWAP config symbol
  mm: memcontrol: use do_memsw_account() in a few more places
  mm: memcontrol: deprecate swapaccounting=0 mode
  mm: memcontrol: don't allocate cgroup swap arrays when memcg is disabled
  mm/secretmem: remove reduntant return value
  mm/hugetlb: add available_huge_pages() func
  mm: remove unused inline functions from include/linux/mm_inline.h
  selftests/vm: add selftest for MADV_COLLAPSE of uffd-minor memory
  selftests/vm: add file/shmem MADV_COLLAPSE selftest for cleared pmd
  selftests/vm: add thp collapse shmem testing
  selftests/vm: add thp collapse file and tmpfs testing
  selftests/vm: modularize thp collapse memory operations
  selftests/vm: dedup THP helpers
  mm/khugepaged: add tracepoint to hpage_collapse_scan_file()
  mm/madvise: add file and shmem support to MADV_COLLAPSE
  ...
2022-10-10 17:53:04 -07:00

832 lines
24 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* arch-independent dma-mapping routines
*
* Copyright (c) 2006 SUSE Linux Products GmbH
* Copyright (c) 2006 Tejun Heo <teheo@suse.de>
*/
#include <linux/memblock.h> /* for max_pfn */
#include <linux/acpi.h>
#include <linux/dma-map-ops.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/kmsan.h>
#include <linux/of_device.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include "debug.h"
#include "direct.h"
bool dma_default_coherent;
/*
* Managed DMA API
*/
struct dma_devres {
size_t size;
void *vaddr;
dma_addr_t dma_handle;
unsigned long attrs;
};
static void dmam_release(struct device *dev, void *res)
{
struct dma_devres *this = res;
dma_free_attrs(dev, this->size, this->vaddr, this->dma_handle,
this->attrs);
}
static int dmam_match(struct device *dev, void *res, void *match_data)
{
struct dma_devres *this = res, *match = match_data;
if (this->vaddr == match->vaddr) {
WARN_ON(this->size != match->size ||
this->dma_handle != match->dma_handle);
return 1;
}
return 0;
}
/**
* dmam_free_coherent - Managed dma_free_coherent()
* @dev: Device to free coherent memory for
* @size: Size of allocation
* @vaddr: Virtual address of the memory to free
* @dma_handle: DMA handle of the memory to free
*
* Managed dma_free_coherent().
*/
void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle)
{
struct dma_devres match_data = { size, vaddr, dma_handle };
dma_free_coherent(dev, size, vaddr, dma_handle);
WARN_ON(devres_destroy(dev, dmam_release, dmam_match, &match_data));
}
EXPORT_SYMBOL(dmam_free_coherent);
/**
* dmam_alloc_attrs - Managed dma_alloc_attrs()
* @dev: Device to allocate non_coherent memory for
* @size: Size of allocation
* @dma_handle: Out argument for allocated DMA handle
* @gfp: Allocation flags
* @attrs: Flags in the DMA_ATTR_* namespace.
*
* Managed dma_alloc_attrs(). Memory allocated using this function will be
* automatically released on driver detach.
*
* RETURNS:
* Pointer to allocated memory on success, NULL on failure.
*/
void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs)
{
struct dma_devres *dr;
void *vaddr;
dr = devres_alloc(dmam_release, sizeof(*dr), gfp);
if (!dr)
return NULL;
vaddr = dma_alloc_attrs(dev, size, dma_handle, gfp, attrs);
if (!vaddr) {
devres_free(dr);
return NULL;
}
dr->vaddr = vaddr;
dr->dma_handle = *dma_handle;
dr->size = size;
dr->attrs = attrs;
devres_add(dev, dr);
return vaddr;
}
EXPORT_SYMBOL(dmam_alloc_attrs);
static bool dma_go_direct(struct device *dev, dma_addr_t mask,
const struct dma_map_ops *ops)
{
if (likely(!ops))
return true;
#ifdef CONFIG_DMA_OPS_BYPASS
if (dev->dma_ops_bypass)
return min_not_zero(mask, dev->bus_dma_limit) >=
dma_direct_get_required_mask(dev);
#endif
return false;
}
/*
* Check if the devices uses a direct mapping for streaming DMA operations.
* This allows IOMMU drivers to set a bypass mode if the DMA mask is large
* enough.
*/
static inline bool dma_alloc_direct(struct device *dev,
const struct dma_map_ops *ops)
{
return dma_go_direct(dev, dev->coherent_dma_mask, ops);
}
static inline bool dma_map_direct(struct device *dev,
const struct dma_map_ops *ops)
{
return dma_go_direct(dev, *dev->dma_mask, ops);
}
dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page,
size_t offset, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
dma_addr_t addr;
BUG_ON(!valid_dma_direction(dir));
if (WARN_ON_ONCE(!dev->dma_mask))
return DMA_MAPPING_ERROR;
if (dma_map_direct(dev, ops) ||
arch_dma_map_page_direct(dev, page_to_phys(page) + offset + size))
addr = dma_direct_map_page(dev, page, offset, size, dir, attrs);
else
addr = ops->map_page(dev, page, offset, size, dir, attrs);
kmsan_handle_dma(page, offset, size, dir);
debug_dma_map_page(dev, page, offset, size, dir, addr, attrs);
return addr;
}
EXPORT_SYMBOL(dma_map_page_attrs);
void dma_unmap_page_attrs(struct device *dev, dma_addr_t addr, size_t size,
enum dma_data_direction dir, unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
BUG_ON(!valid_dma_direction(dir));
if (dma_map_direct(dev, ops) ||
arch_dma_unmap_page_direct(dev, addr + size))
dma_direct_unmap_page(dev, addr, size, dir, attrs);
else if (ops->unmap_page)
ops->unmap_page(dev, addr, size, dir, attrs);
debug_dma_unmap_page(dev, addr, size, dir);
}
EXPORT_SYMBOL(dma_unmap_page_attrs);
static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
int ents;
BUG_ON(!valid_dma_direction(dir));
if (WARN_ON_ONCE(!dev->dma_mask))
return 0;
if (dma_map_direct(dev, ops) ||
arch_dma_map_sg_direct(dev, sg, nents))
ents = dma_direct_map_sg(dev, sg, nents, dir, attrs);
else
ents = ops->map_sg(dev, sg, nents, dir, attrs);
if (ents > 0) {
kmsan_handle_dma_sg(sg, nents, dir);
debug_dma_map_sg(dev, sg, nents, ents, dir, attrs);
} else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM &&
ents != -EIO && ents != -EREMOTEIO)) {
return -EIO;
}
return ents;
}
/**
* dma_map_sg_attrs - Map the given buffer for DMA
* @dev: The device for which to perform the DMA operation
* @sg: The sg_table object describing the buffer
* @nents: Number of entries to map
* @dir: DMA direction
* @attrs: Optional DMA attributes for the map operation
*
* Maps a buffer described by a scatterlist passed in the sg argument with
* nents segments for the @dir DMA operation by the @dev device.
*
* Returns the number of mapped entries (which can be less than nents)
* on success. Zero is returned for any error.
*
* dma_unmap_sg_attrs() should be used to unmap the buffer with the
* original sg and original nents (not the value returned by this funciton).
*/
unsigned int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir, unsigned long attrs)
{
int ret;
ret = __dma_map_sg_attrs(dev, sg, nents, dir, attrs);
if (ret < 0)
return 0;
return ret;
}
EXPORT_SYMBOL(dma_map_sg_attrs);
/**
* dma_map_sgtable - Map the given buffer for DMA
* @dev: The device for which to perform the DMA operation
* @sgt: The sg_table object describing the buffer
* @dir: DMA direction
* @attrs: Optional DMA attributes for the map operation
*
* Maps a buffer described by a scatterlist stored in the given sg_table
* object for the @dir DMA operation by the @dev device. After success, the
* ownership for the buffer is transferred to the DMA domain. One has to
* call dma_sync_sgtable_for_cpu() or dma_unmap_sgtable() to move the
* ownership of the buffer back to the CPU domain before touching the
* buffer by the CPU.
*
* Returns 0 on success or a negative error code on error. The following
* error codes are supported with the given meaning:
*
* -EINVAL An invalid argument, unaligned access or other error
* in usage. Will not succeed if retried.
* -ENOMEM Insufficient resources (like memory or IOVA space) to
* complete the mapping. Should succeed if retried later.
* -EIO Legacy error code with an unknown meaning. eg. this is
* returned if a lower level call returned
* DMA_MAPPING_ERROR.
* -EREMOTEIO The DMA device cannot access P2PDMA memory specified
* in the sg_table. This will not succeed if retried.
*/
int dma_map_sgtable(struct device *dev, struct sg_table *sgt,
enum dma_data_direction dir, unsigned long attrs)
{
int nents;
nents = __dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents, dir, attrs);
if (nents < 0)
return nents;
sgt->nents = nents;
return 0;
}
EXPORT_SYMBOL_GPL(dma_map_sgtable);
void dma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction dir,
unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
BUG_ON(!valid_dma_direction(dir));
debug_dma_unmap_sg(dev, sg, nents, dir);
if (dma_map_direct(dev, ops) ||
arch_dma_unmap_sg_direct(dev, sg, nents))
dma_direct_unmap_sg(dev, sg, nents, dir, attrs);
else if (ops->unmap_sg)
ops->unmap_sg(dev, sg, nents, dir, attrs);
}
EXPORT_SYMBOL(dma_unmap_sg_attrs);
dma_addr_t dma_map_resource(struct device *dev, phys_addr_t phys_addr,
size_t size, enum dma_data_direction dir, unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
dma_addr_t addr = DMA_MAPPING_ERROR;
BUG_ON(!valid_dma_direction(dir));
if (WARN_ON_ONCE(!dev->dma_mask))
return DMA_MAPPING_ERROR;
if (dma_map_direct(dev, ops))
addr = dma_direct_map_resource(dev, phys_addr, size, dir, attrs);
else if (ops->map_resource)
addr = ops->map_resource(dev, phys_addr, size, dir, attrs);
debug_dma_map_resource(dev, phys_addr, size, dir, addr, attrs);
return addr;
}
EXPORT_SYMBOL(dma_map_resource);
void dma_unmap_resource(struct device *dev, dma_addr_t addr, size_t size,
enum dma_data_direction dir, unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
BUG_ON(!valid_dma_direction(dir));
if (!dma_map_direct(dev, ops) && ops->unmap_resource)
ops->unmap_resource(dev, addr, size, dir, attrs);
debug_dma_unmap_resource(dev, addr, size, dir);
}
EXPORT_SYMBOL(dma_unmap_resource);
void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size,
enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
BUG_ON(!valid_dma_direction(dir));
if (dma_map_direct(dev, ops))
dma_direct_sync_single_for_cpu(dev, addr, size, dir);
else if (ops->sync_single_for_cpu)
ops->sync_single_for_cpu(dev, addr, size, dir);
debug_dma_sync_single_for_cpu(dev, addr, size, dir);
}
EXPORT_SYMBOL(dma_sync_single_for_cpu);
void dma_sync_single_for_device(struct device *dev, dma_addr_t addr,
size_t size, enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
BUG_ON(!valid_dma_direction(dir));
if (dma_map_direct(dev, ops))
dma_direct_sync_single_for_device(dev, addr, size, dir);
else if (ops->sync_single_for_device)
ops->sync_single_for_device(dev, addr, size, dir);
debug_dma_sync_single_for_device(dev, addr, size, dir);
}
EXPORT_SYMBOL(dma_sync_single_for_device);
void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
int nelems, enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
BUG_ON(!valid_dma_direction(dir));
if (dma_map_direct(dev, ops))
dma_direct_sync_sg_for_cpu(dev, sg, nelems, dir);
else if (ops->sync_sg_for_cpu)
ops->sync_sg_for_cpu(dev, sg, nelems, dir);
debug_dma_sync_sg_for_cpu(dev, sg, nelems, dir);
}
EXPORT_SYMBOL(dma_sync_sg_for_cpu);
void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
int nelems, enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
BUG_ON(!valid_dma_direction(dir));
if (dma_map_direct(dev, ops))
dma_direct_sync_sg_for_device(dev, sg, nelems, dir);
else if (ops->sync_sg_for_device)
ops->sync_sg_for_device(dev, sg, nelems, dir);
debug_dma_sync_sg_for_device(dev, sg, nelems, dir);
}
EXPORT_SYMBOL(dma_sync_sg_for_device);
/*
* The whole dma_get_sgtable() idea is fundamentally unsafe - it seems
* that the intention is to allow exporting memory allocated via the
* coherent DMA APIs through the dma_buf API, which only accepts a
* scattertable. This presents a couple of problems:
* 1. Not all memory allocated via the coherent DMA APIs is backed by
* a struct page
* 2. Passing coherent DMA memory into the streaming APIs is not allowed
* as we will try to flush the memory through a different alias to that
* actually being used (and the flushes are redundant.)
*/
int dma_get_sgtable_attrs(struct device *dev, struct sg_table *sgt,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (dma_alloc_direct(dev, ops))
return dma_direct_get_sgtable(dev, sgt, cpu_addr, dma_addr,
size, attrs);
if (!ops->get_sgtable)
return -ENXIO;
return ops->get_sgtable(dev, sgt, cpu_addr, dma_addr, size, attrs);
}
EXPORT_SYMBOL(dma_get_sgtable_attrs);
#ifdef CONFIG_MMU
/*
* Return the page attributes used for mapping dma_alloc_* memory, either in
* kernel space if remapping is needed, or to userspace through dma_mmap_*.
*/
pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs)
{
if (dev_is_dma_coherent(dev))
return prot;
#ifdef CONFIG_ARCH_HAS_DMA_WRITE_COMBINE
if (attrs & DMA_ATTR_WRITE_COMBINE)
return pgprot_writecombine(prot);
#endif
return pgprot_dmacoherent(prot);
}
#endif /* CONFIG_MMU */
/**
* dma_can_mmap - check if a given device supports dma_mmap_*
* @dev: device to check
*
* Returns %true if @dev supports dma_mmap_coherent() and dma_mmap_attrs() to
* map DMA allocations to userspace.
*/
bool dma_can_mmap(struct device *dev)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (dma_alloc_direct(dev, ops))
return dma_direct_can_mmap(dev);
return ops->mmap != NULL;
}
EXPORT_SYMBOL_GPL(dma_can_mmap);
/**
* dma_mmap_attrs - map a coherent DMA allocation into user space
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
* @vma: vm_area_struct describing requested user mapping
* @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
* @dma_addr: device-view address returned from dma_alloc_attrs
* @size: size of memory originally requested in dma_alloc_attrs
* @attrs: attributes of mapping properties requested in dma_alloc_attrs
*
* Map a coherent DMA buffer previously allocated by dma_alloc_attrs into user
* space. The coherent DMA buffer must not be freed by the driver until the
* user space mapping has been released.
*/
int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (dma_alloc_direct(dev, ops))
return dma_direct_mmap(dev, vma, cpu_addr, dma_addr, size,
attrs);
if (!ops->mmap)
return -ENXIO;
return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
}
EXPORT_SYMBOL(dma_mmap_attrs);
u64 dma_get_required_mask(struct device *dev)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (dma_alloc_direct(dev, ops))
return dma_direct_get_required_mask(dev);
if (ops->get_required_mask)
return ops->get_required_mask(dev);
/*
* We require every DMA ops implementation to at least support a 32-bit
* DMA mask (and use bounce buffering if that isn't supported in
* hardware). As the direct mapping code has its own routine to
* actually report an optimal mask we default to 32-bit here as that
* is the right thing for most IOMMUs, and at least not actively
* harmful in general.
*/
return DMA_BIT_MASK(32);
}
EXPORT_SYMBOL_GPL(dma_get_required_mask);
void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flag, unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
void *cpu_addr;
WARN_ON_ONCE(!dev->coherent_dma_mask);
if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
return cpu_addr;
/* let the implementation decide on the zone to allocate from: */
flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
if (dma_alloc_direct(dev, ops))
cpu_addr = dma_direct_alloc(dev, size, dma_handle, flag, attrs);
else if (ops->alloc)
cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
else
return NULL;
debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr, attrs);
return cpu_addr;
}
EXPORT_SYMBOL(dma_alloc_attrs);
void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_handle, unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr))
return;
/*
* On non-coherent platforms which implement DMA-coherent buffers via
* non-cacheable remaps, ops->free() may call vunmap(). Thus getting
* this far in IRQ context is a) at risk of a BUG_ON() or trying to
* sleep on some machines, and b) an indication that the driver is
* probably misusing the coherent API anyway.
*/
WARN_ON(irqs_disabled());
if (!cpu_addr)
return;
debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
if (dma_alloc_direct(dev, ops))
dma_direct_free(dev, size, cpu_addr, dma_handle, attrs);
else if (ops->free)
ops->free(dev, size, cpu_addr, dma_handle, attrs);
}
EXPORT_SYMBOL(dma_free_attrs);
static struct page *__dma_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (WARN_ON_ONCE(!dev->coherent_dma_mask))
return NULL;
if (WARN_ON_ONCE(gfp & (__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM)))
return NULL;
size = PAGE_ALIGN(size);
if (dma_alloc_direct(dev, ops))
return dma_direct_alloc_pages(dev, size, dma_handle, dir, gfp);
if (!ops->alloc_pages)
return NULL;
return ops->alloc_pages(dev, size, dma_handle, dir, gfp);
}
struct page *dma_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)
{
struct page *page = __dma_alloc_pages(dev, size, dma_handle, dir, gfp);
if (page)
debug_dma_map_page(dev, page, 0, size, dir, *dma_handle, 0);
return page;
}
EXPORT_SYMBOL_GPL(dma_alloc_pages);
static void __dma_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
size = PAGE_ALIGN(size);
if (dma_alloc_direct(dev, ops))
dma_direct_free_pages(dev, size, page, dma_handle, dir);
else if (ops->free_pages)
ops->free_pages(dev, size, page, dma_handle, dir);
}
void dma_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir)
{
debug_dma_unmap_page(dev, dma_handle, size, dir);
__dma_free_pages(dev, size, page, dma_handle, dir);
}
EXPORT_SYMBOL_GPL(dma_free_pages);
int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
size_t size, struct page *page)
{
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
if (vma->vm_pgoff >= count || vma_pages(vma) > count - vma->vm_pgoff)
return -ENXIO;
return remap_pfn_range(vma, vma->vm_start,
page_to_pfn(page) + vma->vm_pgoff,
vma_pages(vma) << PAGE_SHIFT, vma->vm_page_prot);
}
EXPORT_SYMBOL_GPL(dma_mmap_pages);
static struct sg_table *alloc_single_sgt(struct device *dev, size_t size,
enum dma_data_direction dir, gfp_t gfp)
{
struct sg_table *sgt;
struct page *page;
sgt = kmalloc(sizeof(*sgt), gfp);
if (!sgt)
return NULL;
if (sg_alloc_table(sgt, 1, gfp))
goto out_free_sgt;
page = __dma_alloc_pages(dev, size, &sgt->sgl->dma_address, dir, gfp);
if (!page)
goto out_free_table;
sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
sg_dma_len(sgt->sgl) = sgt->sgl->length;
return sgt;
out_free_table:
sg_free_table(sgt);
out_free_sgt:
kfree(sgt);
return NULL;
}
struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size,
enum dma_data_direction dir, gfp_t gfp, unsigned long attrs)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
struct sg_table *sgt;
if (WARN_ON_ONCE(attrs & ~DMA_ATTR_ALLOC_SINGLE_PAGES))
return NULL;
if (ops && ops->alloc_noncontiguous)
sgt = ops->alloc_noncontiguous(dev, size, dir, gfp, attrs);
else
sgt = alloc_single_sgt(dev, size, dir, gfp);
if (sgt) {
sgt->nents = 1;
debug_dma_map_sg(dev, sgt->sgl, sgt->orig_nents, 1, dir, attrs);
}
return sgt;
}
EXPORT_SYMBOL_GPL(dma_alloc_noncontiguous);
static void free_single_sgt(struct device *dev, size_t size,
struct sg_table *sgt, enum dma_data_direction dir)
{
__dma_free_pages(dev, size, sg_page(sgt->sgl), sgt->sgl->dma_address,
dir);
sg_free_table(sgt);
kfree(sgt);
}
void dma_free_noncontiguous(struct device *dev, size_t size,
struct sg_table *sgt, enum dma_data_direction dir)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
debug_dma_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir);
if (ops && ops->free_noncontiguous)
ops->free_noncontiguous(dev, size, sgt, dir);
else
free_single_sgt(dev, size, sgt, dir);
}
EXPORT_SYMBOL_GPL(dma_free_noncontiguous);
void *dma_vmap_noncontiguous(struct device *dev, size_t size,
struct sg_table *sgt)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
if (ops && ops->alloc_noncontiguous)
return vmap(sgt_handle(sgt)->pages, count, VM_MAP, PAGE_KERNEL);
return page_address(sg_page(sgt->sgl));
}
EXPORT_SYMBOL_GPL(dma_vmap_noncontiguous);
void dma_vunmap_noncontiguous(struct device *dev, void *vaddr)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (ops && ops->alloc_noncontiguous)
vunmap(vaddr);
}
EXPORT_SYMBOL_GPL(dma_vunmap_noncontiguous);
int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma,
size_t size, struct sg_table *sgt)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (ops && ops->alloc_noncontiguous) {
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
if (vma->vm_pgoff >= count ||
vma_pages(vma) > count - vma->vm_pgoff)
return -ENXIO;
return vm_map_pages(vma, sgt_handle(sgt)->pages, count);
}
return dma_mmap_pages(dev, vma, size, sg_page(sgt->sgl));
}
EXPORT_SYMBOL_GPL(dma_mmap_noncontiguous);
static int dma_supported(struct device *dev, u64 mask)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
/*
* ->dma_supported sets the bypass flag, so we must always call
* into the method here unless the device is truly direct mapped.
*/
if (!ops)
return dma_direct_supported(dev, mask);
if (!ops->dma_supported)
return 1;
return ops->dma_supported(dev, mask);
}
bool dma_pci_p2pdma_supported(struct device *dev)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
/* if ops is not set, dma direct will be used which supports P2PDMA */
if (!ops)
return true;
/*
* Note: dma_ops_bypass is not checked here because P2PDMA should
* not be used with dma mapping ops that do not have support even
* if the specific device is bypassing them.
*/
return ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED;
}
EXPORT_SYMBOL_GPL(dma_pci_p2pdma_supported);
#ifdef CONFIG_ARCH_HAS_DMA_SET_MASK
void arch_dma_set_mask(struct device *dev, u64 mask);
#else
#define arch_dma_set_mask(dev, mask) do { } while (0)
#endif
int dma_set_mask(struct device *dev, u64 mask)
{
/*
* Truncate the mask to the actually supported dma_addr_t width to
* avoid generating unsupportable addresses.
*/
mask = (dma_addr_t)mask;
if (!dev->dma_mask || !dma_supported(dev, mask))
return -EIO;
arch_dma_set_mask(dev, mask);
*dev->dma_mask = mask;
return 0;
}
EXPORT_SYMBOL(dma_set_mask);
int dma_set_coherent_mask(struct device *dev, u64 mask)
{
/*
* Truncate the mask to the actually supported dma_addr_t width to
* avoid generating unsupportable addresses.
*/
mask = (dma_addr_t)mask;
if (!dma_supported(dev, mask))
return -EIO;
dev->coherent_dma_mask = mask;
return 0;
}
EXPORT_SYMBOL(dma_set_coherent_mask);
size_t dma_max_mapping_size(struct device *dev)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
size_t size = SIZE_MAX;
if (dma_map_direct(dev, ops))
size = dma_direct_max_mapping_size(dev);
else if (ops && ops->max_mapping_size)
size = ops->max_mapping_size(dev);
return size;
}
EXPORT_SYMBOL_GPL(dma_max_mapping_size);
size_t dma_opt_mapping_size(struct device *dev)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
size_t size = SIZE_MAX;
if (ops && ops->opt_mapping_size)
size = ops->opt_mapping_size();
return min(dma_max_mapping_size(dev), size);
}
EXPORT_SYMBOL_GPL(dma_opt_mapping_size);
bool dma_need_sync(struct device *dev, dma_addr_t dma_addr)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (dma_map_direct(dev, ops))
return dma_direct_need_sync(dev, dma_addr);
return ops->sync_single_for_cpu || ops->sync_single_for_device;
}
EXPORT_SYMBOL_GPL(dma_need_sync);
unsigned long dma_get_merge_boundary(struct device *dev)
{
const struct dma_map_ops *ops = get_dma_ops(dev);
if (!ops || !ops->get_merge_boundary)
return 0; /* can't merge */
return ops->get_merge_boundary(dev);
}
EXPORT_SYMBOL_GPL(dma_get_merge_boundary);