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dma-mapping: consolidate the dma mmap implementations

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The only functional differences (modulo a few missing fixes in the arch
code) is that architectures without coherent caches need a hook to
convert a virtual or dma address into a pfn, given that we don't have
the kernel linear mapping available for the otherwise easy virt_to_page
call.  As a side effect we can support mmap of the per-device coherent
area even on architectures not providing the callback, and we make
previous dangerous default methods dma_common_mmap actually save for
non-coherent architectures by rejecting it without the right helper.

In addition to that we need a hook so that some architectures can
override the protection bits when mmaping a dma coherent allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts
This commit is contained in:
Christoph Hellwig 2018-09-11 08:55:28 +02:00
parent bc3ec75de5
commit 58b0440663
16 changed files with 59 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arc/Kconfig
View File

@ -9,6 +9,7 @@
config ARC
def_bool y
select ARC_TIMERS
select ARCH_HAS_DMA_COHERENT_TO_PFN
select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
@ -18,7 +19,6 @@ config ARC
select CLONE_BACKWARDS
select COMMON_CLK
select DMA_DIRECT_OPS
select DMA_NONCOHERENT_MMAP
select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC)
select GENERIC_CLOCKEVENTS
select GENERIC_FIND_FIRST_BIT

25
arch/arc/mm/dma.c
View File

@ -84,29 +84,10 @@ void arch_dma_free(struct device *dev, size_t size, void *vaddr,
__free_pages(page, get_order(size));
}
int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
dma_addr_t dma_addr)
{
unsigned long user_count = vma_pages(vma);
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long pfn = __phys_to_pfn(dma_addr);
unsigned long off = vma->vm_pgoff;
int ret = -ENXIO;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
return ret;
if (off < count && user_count <= (count - off)) {
ret = remap_pfn_range(vma, vma->vm_start,
pfn + off,
user_count << PAGE_SHIFT,
vma->vm_page_prot);
}
return ret;
return __phys_to_pfn(dma_addr);
}
/*

2
arch/arm/mm/dma-mapping-nommu.c
View File

@ -91,7 +91,7 @@ static int arm_nommu_dma_mmap(struct device *dev, struct vm_area_struct *vma,
if (dma_mmap_from_global_coherent(vma, cpu_addr, size, &ret))
return ret;
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
}

2
arch/microblaze/Kconfig
View File

@ -1,6 +1,7 @@
config MICROBLAZE
def_bool y
select ARCH_NO_SWAP
select ARCH_HAS_DMA_COHERENT_TO_PFN if MMU
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
@ -12,7 +13,6 @@ config MICROBLAZE
select CLONE_BACKWARDS3
select COMMON_CLK
select DMA_DIRECT_OPS
select DMA_NONCOHERENT_MMAP
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_CPU_DEVICES

2
arch/microblaze/include/asm/pgtable.h
View File

@ -553,8 +553,6 @@ void __init *early_get_page(void);
extern unsigned long ioremap_bot, ioremap_base;
unsigned long consistent_virt_to_pfn(void *vaddr);
void setup_memory(void);
#endif /* __ASSEMBLY__ */

22
arch/microblaze/kernel/dma.c
View File

@ -42,25 +42,3 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
{
__dma_sync(dev, paddr, size, dir);
}
int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t handle, size_t size,
unsigned long attrs)
{
#ifdef CONFIG_MMU
unsigned long user_count = vma_pages(vma);
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
unsigned long pfn;
if (off >= count || user_count > (count - off))
return -ENXIO;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
pfn = consistent_virt_to_pfn(cpu_addr);
return remap_pfn_range(vma, vma->vm_start, pfn + off,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
#else
return -ENXIO;
#endif
}

3
arch/microblaze/mm/consistent.c
View File

@ -165,7 +165,8 @@ static pte_t *consistent_virt_to_pte(void *vaddr)
return pte_offset_kernel(pmd_offset(pgd_offset_k(addr), addr), addr);
}
unsigned long consistent_virt_to_pfn(void *vaddr)
long arch_dma_coherent_to_pfn(struct device *dev, void *vaddr,
dma_addr_t dma_addr)
{
pte_t *ptep = consistent_virt_to_pte(vaddr);

3
arch/mips/Kconfig
View File

@ -1116,10 +1116,11 @@ config DMA_PERDEV_COHERENT
config DMA_NONCOHERENT
bool
select ARCH_HAS_DMA_MMAP_PGPROT
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_HAS_SYNC_DMA_FOR_CPU
select NEED_DMA_MAP_STATE
select DMA_NONCOHERENT_MMAP
select ARCH_HAS_DMA_COHERENT_TO_PFN
select DMA_NONCOHERENT_CACHE_SYNC
config SYS_HAS_EARLY_PRINTK

1
arch/mips/jazz/jazzdma.c
View File

@ -682,7 +682,6 @@ static int jazz_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
const struct dma_map_ops jazz_dma_ops = {
.alloc = jazz_dma_alloc,
.free = jazz_dma_free,
.mmap = arch_dma_mmap,
.map_page = jazz_dma_map_page,
.unmap_page = jazz_dma_unmap_page,
.map_sg = jazz_dma_map_sg,

34
arch/mips/mm/dma-noncoherent.c
View File

@ -66,33 +66,19 @@ void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs);
}
int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
dma_addr_t dma_addr)
{
unsigned long addr = CAC_ADDR((unsigned long)cpu_addr);
return page_to_pfn(virt_to_page((void *)addr));
}
pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
unsigned long attrs)
{
unsigned long user_count = vma_pages(vma);
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long addr = CAC_ADDR((unsigned long)cpu_addr);
unsigned long off = vma->vm_pgoff;
unsigned long pfn = page_to_pfn(virt_to_page((void *)addr));
int ret = -ENXIO;
if (attrs & DMA_ATTR_WRITE_COMBINE)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
else
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
return ret;
if (off < count && user_count <= (count - off)) {
ret = remap_pfn_range(vma, vma->vm_start,
pfn + off,
user_count << PAGE_SHIFT,
vma->vm_page_prot);
}
return ret;
return pgprot_writecombine(prot);
return pgprot_noncached(prot);
}
static inline void dma_sync_virt(void *addr, size_t size,

2
drivers/xen/swiotlb-xen.c
View File

@ -662,7 +662,7 @@ xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma,
return xen_get_dma_ops(dev)->mmap(dev, vma, cpu_addr,
dma_addr, size, attrs);
#endif
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
}
/*

5
include/linux/dma-mapping.h
View File

@ -444,7 +444,8 @@ dma_cache_sync(struct device *dev, void *vaddr, size_t size,
}
extern int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size);
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs);
void *dma_common_contiguous_remap(struct page *page, size_t size,
unsigned long vm_flags,
@ -476,7 +477,7 @@ dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
BUG_ON(!ops);
if (ops->mmap)
return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
}
#define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0)

10
include/linux/dma-noncoherent.h
View File

@ -24,9 +24,15 @@ void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs);
int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
dma_addr_t dma_addr);
#ifdef CONFIG_ARCH_HAS_DMA_MMAP_PGPROT
pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot,
unsigned long attrs);
#else
# define arch_dma_mmap_pgprot(dev, prot, attrs) pgprot_noncached(prot)
#endif
#ifdef CONFIG_DMA_NONCOHERENT_CACHE_SYNC
void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,

10
kernel/dma/Kconfig
View File

@ -29,14 +29,16 @@ config ARCH_HAS_SYNC_DMA_FOR_CPU
config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
bool
config ARCH_HAS_DMA_COHERENT_TO_PFN
bool
config ARCH_HAS_DMA_MMAP_PGPROT
bool
config DMA_DIRECT_OPS
bool
depends on HAS_DMA
config DMA_NONCOHERENT_MMAP
bool
depends on DMA_DIRECT_OPS
config DMA_NONCOHERENT_CACHE_SYNC
bool
depends on DMA_DIRECT_OPS

11
kernel/dma/direct.c
View File

@ -155,16 +155,6 @@ void dma_direct_free(struct device *dev, size_t size,
dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs);
}
static int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
if (!dev_is_dma_coherent(dev) &&
IS_ENABLED(CONFIG_DMA_NONCOHERENT_MMAP))
return arch_dma_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}
static void dma_direct_sync_single_for_device(struct device *dev,
dma_addr_t addr, size_t size, enum dma_data_direction dir)
{
@ -293,7 +283,6 @@ int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr)
const struct dma_map_ops dma_direct_ops = {
.alloc = dma_direct_alloc,
.free = dma_direct_free,
.mmap = dma_direct_mmap,
.map_page = dma_direct_map_page,
.map_sg = dma_direct_map_sg,
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE)

32
kernel/dma/mapping.c
View File

@ -7,7 +7,7 @@
*/
#include <linux/acpi.h>
#include <linux/dma-mapping.h>
#include <linux/dma-noncoherent.h>
#include <linux/export.h>
#include <linux/gfp.h>
#include <linux/of_device.h>
@ -220,27 +220,37 @@ EXPORT_SYMBOL(dma_common_get_sgtable);
* Create userspace mapping for the DMA-coherent memory.
*/
int dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size)
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
int ret = -ENXIO;
#ifndef CONFIG_ARCH_NO_COHERENT_DMA_MMAP
unsigned long user_count = vma_pages(vma);
unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
unsigned long pfn;
int ret = -ENXIO;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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 < count && user_count <= (count - off))
ret = remap_pfn_range(vma, vma->vm_start,
page_to_pfn(virt_to_page(cpu_addr)) + off,
user_count << PAGE_SHIFT,
vma->vm_page_prot);
#endif /* !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */
if (off >= count || user_count > count - off)
return -ENXIO;
return ret;
if (!dev_is_dma_coherent(dev)) {
if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_COHERENT_TO_PFN))
return -ENXIO;
pfn = arch_dma_coherent_to_pfn(dev, cpu_addr, dma_addr);
} else {
pfn = page_to_pfn(virt_to_page(cpu_addr));
}
return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
user_count << PAGE_SHIFT, vma->vm_page_prot);
#else
return -ENXIO;
#endif /* !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */
}
EXPORT_SYMBOL(dma_common_mmap);