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DMA mapping updates for 5.2

Browse source 
- remove the already broken support for NULL dev arguments to the
    DMA API calls
  - Kconfig tidyups
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Merge tag 'dma-mapping-5.2' of git://git.infradead.org/users/hch/dma-mapping

Pull DMA mapping updates from Christoph Hellwig:

 - remove the already broken support for NULL dev arguments to the DMA
   API calls

 - Kconfig tidyups

* tag 'dma-mapping-5.2' of git://git.infradead.org/users/hch/dma-mapping:
  dma-mapping: add a Kconfig symbol to indicate arch_dma_prep_coherent presence
  dma-mapping: remove an unnecessary NULL check
  x86/dma: Remove the x86_dma_fallback_dev hack
  dma-mapping: remove leftover NULL device support
  arm: use a dummy struct device for ISA DMA use of the DMA API
  pxa3xx-gcu: pass struct device to dma_mmap_coherent
  gbefb: switch to managed version of the DMA allocator
  da8xx-fb: pass struct device to DMA API functions
  parport_ip32: pass struct device to DMA API functions
  dma: select GENERIC_ALLOCATOR for DMA_REMAP
This commit is contained in:
Linus Torvalds 2019-05-09 08:40:55 -07:00
parent e57ccca1ba 13bf5ced93
commit ddab5337b2
17 changed files with 65 additions and 88 deletions
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13
Documentation/DMA-API-HOWTO.txt
View file

@ -365,13 +365,12 @@ __get_free_pages() (but takes size instead of a page order). If your
driver needs regions sized smaller than a page, you may prefer using
the dma_pool interface, described below.
The consistent DMA mapping interfaces, for non-NULL dev, will by
default return a DMA address which is 32-bit addressable. Even if the
device indicates (via DMA mask) that it may address the upper 32-bits,
consistent allocation will only return > 32-bit addresses for DMA if
the consistent DMA mask has been explicitly changed via
dma_set_coherent_mask(). This is true of the dma_pool interface as
well.
The consistent DMA mapping interfaces, will by default return a DMA address
which is 32-bit addressable. Even if the device indicates (via the DMA mask)
that it may address the upper 32-bits, consistent allocation will only
return > 32-bit addresses for DMA if the consistent DMA mask has been
explicitly changed via dma_set_coherent_mask(). This is true of the
dma_pool interface as well.
dma_alloc_coherent() returns two values: the virtual address which you
can use to access it from the CPU and dma_handle which you pass to the

8
arch/arm/kernel/dma-isa.c
View file

@ -55,6 +55,12 @@ static int isa_get_dma_residue(unsigned int chan, dma_t *dma)
return chan < 4 ? count : (count << 1);
}
static struct device isa_dma_dev = {
.init_name = "fallback device",
.coherent_dma_mask = ~(dma_addr_t)0,
.dma_mask = &isa_dma_dev.coherent_dma_mask,
};
static void isa_enable_dma(unsigned int chan, dma_t *dma)
{
if (dma->invalid) {
@ -89,7 +95,7 @@ static void isa_enable_dma(unsigned int chan, dma_t *dma)
dma->sg = &dma->buf;
dma->sgcount = 1;
dma->buf.length = dma->count;
dma->buf.dma_address = dma_map_single(NULL,
dma->buf.dma_address = dma_map_single(&isa_dma_dev,
dma->addr, dma->count,
direction);
}

8
arch/arm/mach-rpc/dma.c
View file

@ -151,6 +151,12 @@ static void iomd_free_dma(unsigned int chan, dma_t *dma)
free_irq(idma->irq, idma);
}
static struct device isa_dma_dev = {
.init_name = "fallback device",
.coherent_dma_mask = ~(dma_addr_t)0,
.dma_mask = &isa_dma_dev.coherent_dma_mask,
};
static void iomd_enable_dma(unsigned int chan, dma_t *dma)
{
struct iomd_dma *idma = container_of(dma, struct iomd_dma, dma);
@ -168,7 +174,7 @@ static void iomd_enable_dma(unsigned int chan, dma_t *dma)
idma->dma.sg = &idma->dma.buf;
idma->dma.sgcount = 1;
idma->dma.buf.length = idma->dma.count;
idma->dma.buf.dma_address = dma_map_single(NULL,
idma->dma.buf.dma_address = dma_map_single(&isa_dma_dev,
idma->dma.addr, idma->dma.count,
idma->dma.dma_mode == DMA_MODE_READ ?
DMA_FROM_DEVICE : DMA_TO_DEVICE);

1
arch/arm64/Kconfig
View file

@ -13,6 +13,7 @@ config ARM64
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_DMA_COHERENT_TO_PFN
select ARCH_HAS_DMA_MMAP_PGPROT
select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FAST_MULTIPLIER

1
arch/csky/Kconfig
View file

@ -1,6 +1,7 @@
config CSKY
def_bool y
select ARCH_32BIT_OFF_T
select ARCH_HAS_DMA_PREP_COHERENT
select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_USE_BUILTIN_BSWAP

10
arch/x86/include/asm/dma-mapping.h
View file

@ -13,14 +13,7 @@
#include <asm/swiotlb.h>
#include <linux/dma-contiguous.h>
#ifdef CONFIG_ISA
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(24)
#else
# define ISA_DMA_BIT_MASK DMA_BIT_MASK(32)
#endif
extern int iommu_merge;
extern struct device x86_dma_fallback_dev;
extern int panic_on_overflow;
extern const struct dma_map_ops *dma_ops;
@ -30,7 +23,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return dma_ops;
}
bool arch_dma_alloc_attrs(struct device **dev);
#define arch_dma_alloc_attrs arch_dma_alloc_attrs
#endif

6
arch/x86/kernel/amd_gart_64.c
View file

@ -233,9 +233,6 @@ static dma_addr_t gart_map_page(struct device *dev, struct page *page,
unsigned long bus;
phys_addr_t paddr = page_to_phys(page) + offset;
if (!dev)
dev = &x86_dma_fallback_dev;
if (!need_iommu(dev, paddr, size))
return paddr;
@ -392,9 +389,6 @@ static int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents,
if (nents == 0)
return 0;
if (!dev)
dev = &x86_dma_fallback_dev;
out = 0;
start = 0;
start_sg = sg;

20
arch/x86/kernel/pci-dma.c
View file

@ -51,14 +51,6 @@ int iommu_pass_through __read_mostly;
extern struct iommu_table_entry __iommu_table[], __iommu_table_end[];
/* Dummy device used for NULL arguments (normally ISA). */
struct device x86_dma_fallback_dev = {
.init_name = "fallback device",
.coherent_dma_mask = ISA_DMA_BIT_MASK,
.dma_mask = &x86_dma_fallback_dev.coherent_dma_mask,
};
EXPORT_SYMBOL(x86_dma_fallback_dev);
void __init pci_iommu_alloc(void)
{
struct iommu_table_entry *p;
@ -77,18 +69,6 @@ void __init pci_iommu_alloc(void)
}
}
bool arch_dma_alloc_attrs(struct device **dev)
{
if (!*dev)
*dev = &x86_dma_fallback_dev;
if (!is_device_dma_capable(*dev))
return false;
return true;
}
EXPORT_SYMBOL(arch_dma_alloc_attrs);
/*
* See <Documentation/x86/x86_64/boot-options.txt> for the iommu kernel
* parameter documentation.

18
drivers/parport/parport_ip32.c
View file

@ -568,6 +568,7 @@ static irqreturn_t parport_ip32_merr_interrupt(int irq, void *dev_id)
/**
* parport_ip32_dma_start - begins a DMA transfer
* @p: partport to work on
* @dir: DMA direction: DMA_TO_DEVICE or DMA_FROM_DEVICE
* @addr: pointer to data buffer
* @count: buffer size
@ -575,8 +576,8 @@ static irqreturn_t parport_ip32_merr_interrupt(int irq, void *dev_id)
* Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be
* correctly balanced.
*/
static int parport_ip32_dma_start(enum dma_data_direction dir,
void *addr, size_t count)
static int parport_ip32_dma_start(struct parport *p,
enum dma_data_direction dir, void *addr, size_t count)
{
unsigned int limit;
u64 ctrl;
@ -601,7 +602,7 @@ static int parport_ip32_dma_start(enum dma_data_direction dir,
/* Prepare DMA pointers */
parport_ip32_dma.dir = dir;
parport_ip32_dma.buf = dma_map_single(NULL, addr, count, dir);
parport_ip32_dma.buf = dma_map_single(&p->bus_dev, addr, count, dir);
parport_ip32_dma.len = count;
parport_ip32_dma.next = parport_ip32_dma.buf;
parport_ip32_dma.left = parport_ip32_dma.len;
@ -625,11 +626,12 @@ static int parport_ip32_dma_start(enum dma_data_direction dir,
/**
* parport_ip32_dma_stop - ends a running DMA transfer
* @p: partport to work on
*
* Calls to parport_ip32_dma_start() and parport_ip32_dma_stop() must be
* correctly balanced.
*/
static void parport_ip32_dma_stop(void)
static void parport_ip32_dma_stop(struct parport *p)
{
u64 ctx_a;
u64 ctx_b;
@ -685,8 +687,8 @@ static void parport_ip32_dma_stop(void)
enable_irq(MACEISA_PAR_CTXB_IRQ);
parport_ip32_dma.irq_on = 1;
dma_unmap_single(NULL, parport_ip32_dma.buf, parport_ip32_dma.len,
parport_ip32_dma.dir);
dma_unmap_single(&p->bus_dev, parport_ip32_dma.buf,
parport_ip32_dma.len, parport_ip32_dma.dir);
}
/**
@ -1445,7 +1447,7 @@ static size_t parport_ip32_fifo_write_block_dma(struct parport *p,
priv->irq_mode = PARPORT_IP32_IRQ_HERE;
parport_ip32_dma_start(DMA_TO_DEVICE, (void *)buf, len);
parport_ip32_dma_start(p, DMA_TO_DEVICE, (void *)buf, len);
reinit_completion(&priv->irq_complete);
parport_ip32_frob_econtrol(p, ECR_DMAEN | ECR_SERVINTR, ECR_DMAEN);
@ -1461,7 +1463,7 @@ static size_t parport_ip32_fifo_write_block_dma(struct parport *p,
if (ecr & ECR_SERVINTR)
break; /* DMA transfer just finished */
}
parport_ip32_dma_stop();
parport_ip32_dma_stop(p);
written = len - parport_ip32_dma_get_residue();
priv->irq_mode = PARPORT_IP32_IRQ_FWD;

13
drivers/video/fbdev/da8xx-fb.c
View file

@ -1097,9 +1097,9 @@ static int fb_remove(struct platform_device *dev)
unregister_framebuffer(info);
fb_dealloc_cmap(&info->cmap);
dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
dma_free_coherent(par->dev, PALETTE_SIZE, par->v_palette_base,
par->p_palette_base);
dma_free_coherent(NULL, par->vram_size, par->vram_virt,
dma_free_coherent(par->dev, par->vram_size, par->vram_virt,
par->vram_phys);
pm_runtime_put_sync(&dev->dev);
pm_runtime_disable(&dev->dev);
@ -1425,7 +1425,7 @@ static int fb_probe(struct platform_device *device)
par->vram_size = roundup(par->vram_size/8, ulcm);
par->vram_size = par->vram_size * LCD_NUM_BUFFERS;
par->vram_virt = dma_alloc_coherent(NULL,
par->vram_virt = dma_alloc_coherent(par->dev,
par->vram_size,
&par->vram_phys,
GFP_KERNEL | GFP_DMA);
@ -1446,7 +1446,7 @@ static int fb_probe(struct platform_device *device)
da8xx_fb_fix.line_length - 1;
/* allocate palette buffer */
par->v_palette_base = dma_alloc_coherent(NULL, PALETTE_SIZE,
par->v_palette_base = dma_alloc_coherent(par->dev, PALETTE_SIZE,
&par->p_palette_base,
GFP_KERNEL | GFP_DMA);
if (!par->v_palette_base) {
@ -1532,11 +1532,12 @@ err_dealloc_cmap:
fb_dealloc_cmap(&da8xx_fb_info->cmap);
err_release_pl_mem:
dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
dma_free_coherent(par->dev, PALETTE_SIZE, par->v_palette_base,
par->p_palette_base);
err_release_fb_mem:
dma_free_coherent(NULL, par->vram_size, par->vram_virt, par->vram_phys);
dma_free_coherent(par->dev, par->vram_size, par->vram_virt,
par->vram_phys);
err_release_fb:
framebuffer_release(da8xx_fb_info);

24
drivers/video/fbdev/gbefb.c
View file

@ -1162,9 +1162,9 @@ static int gbefb_probe(struct platform_device *p_dev)
}
gbe_revision = gbe->ctrlstat & 15;
gbe_tiles.cpu =
dma_alloc_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
&gbe_tiles.dma, GFP_KERNEL);
gbe_tiles.cpu = dmam_alloc_coherent(&p_dev->dev,
GBE_TLB_SIZE * sizeof(uint16_t),
&gbe_tiles.dma, GFP_KERNEL);
if (!gbe_tiles.cpu) {
printk(KERN_ERR "gbefb: couldn't allocate tiles table\n");
ret = -ENOMEM;
@ -1178,19 +1178,20 @@ static int gbefb_probe(struct platform_device *p_dev)
if (!gbe_mem) {
printk(KERN_ERR "gbefb: couldn't map framebuffer\n");
ret = -ENOMEM;
goto out_tiles_free;
goto out_release_mem_region;
}
gbe_dma_addr = 0;
} else {
/* try to allocate memory with the classical allocator
* this has high chance to fail on low memory machines */
gbe_mem = dma_alloc_wc(NULL, gbe_mem_size, &gbe_dma_addr,
GFP_KERNEL);
gbe_mem = dmam_alloc_attrs(&p_dev->dev, gbe_mem_size,
&gbe_dma_addr, GFP_KERNEL,
DMA_ATTR_WRITE_COMBINE);
if (!gbe_mem) {
printk(KERN_ERR "gbefb: couldn't allocate framebuffer memory\n");
ret = -ENOMEM;
goto out_tiles_free;
goto out_release_mem_region;
}
gbe_mem_phys = (unsigned long) gbe_dma_addr;
@ -1237,11 +1238,6 @@ static int gbefb_probe(struct platform_device *p_dev)
out_gbe_unmap:
arch_phys_wc_del(par->wc_cookie);
if (gbe_dma_addr)
dma_free_wc(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
out_tiles_free:
dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
(void *)gbe_tiles.cpu, gbe_tiles.dma);
out_release_mem_region:
release_mem_region(GBE_BASE, sizeof(struct sgi_gbe));
out_release_framebuffer:
@ -1258,10 +1254,6 @@ static int gbefb_remove(struct platform_device* p_dev)
unregister_framebuffer(info);
gbe_turn_off();
arch_phys_wc_del(par->wc_cookie);
if (gbe_dma_addr)
dma_free_wc(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys);
dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t),
(void *)gbe_tiles.cpu, gbe_tiles.dma);
release_mem_region(GBE_BASE, sizeof(struct sgi_gbe));
gbefb_remove_sysfs(&p_dev->dev);
framebuffer_release(info);

4
drivers/video/fbdev/pxa3xx-gcu.c
View file

@ -96,6 +96,7 @@ struct pxa3xx_gcu_batch {
};
struct pxa3xx_gcu_priv {
struct device *dev;
void __iomem *mmio_base;
struct clk *clk;
struct pxa3xx_gcu_shared *shared;
@ -493,7 +494,7 @@ pxa3xx_gcu_mmap(struct file *file, struct vm_area_struct *vma)
if (size != SHARED_SIZE)
return -EINVAL;
return dma_mmap_coherent(NULL, vma,
return dma_mmap_coherent(priv->dev, vma,
priv->shared, priv->shared_phys, size);
case SHARED_SIZE >> PAGE_SHIFT:
@ -670,6 +671,7 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, priv);
priv->resource_mem = r;
priv->dev = dev;
pxa3xx_gcu_reset(priv);
pxa3xx_gcu_init_debug_timer(priv);

6
include/linux/dma-mapping.h
View file

@ -267,9 +267,9 @@ size_t dma_direct_max_mapping_size(struct device *dev);
static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
{
if (dev && dev->dma_ops)
if (dev->dma_ops)
return dev->dma_ops;
return get_arch_dma_ops(dev ? dev->bus : NULL);
return get_arch_dma_ops(dev->bus);
}
static inline void set_dma_ops(struct device *dev,
@ -650,7 +650,7 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
static inline u64 dma_get_mask(struct device *dev)
{
if (dev && dev->dma_mask && *dev->dma_mask)
if (dev->dma_mask && *dev->dma_mask)
return *dev->dma_mask;
return DMA_BIT_MASK(32);
}

6
include/linux/dma-noncoherent.h
View file

@ -72,6 +72,12 @@ static inline void arch_sync_dma_for_cpu_all(struct device *dev)
}
#endif /* CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL */
#ifdef CONFIG_ARCH_HAS_DMA_PREP_COHERENT
void arch_dma_prep_coherent(struct page *page, size_t size);
#else
static inline void arch_dma_prep_coherent(struct page *page, size_t size)
{
}
#endif /* CONFIG_ARCH_HAS_DMA_PREP_COHERENT */
#endif /* _LINUX_DMA_NONCOHERENT_H */

4
kernel/dma/Kconfig
View file

@ -38,6 +38,9 @@ config ARCH_HAS_SYNC_DMA_FOR_CPU
config ARCH_HAS_SYNC_DMA_FOR_CPU_ALL
bool
config ARCH_HAS_DMA_PREP_COHERENT
bool
config ARCH_HAS_DMA_COHERENT_TO_PFN
bool
@ -57,6 +60,7 @@ config SWIOTLB
config DMA_REMAP
depends on MMU
select GENERIC_ALLOCATOR
bool
config DMA_DIRECT_REMAP

2
kernel/dma/direct.c
View file

@ -311,7 +311,7 @@ static inline bool dma_direct_possible(struct device *dev, dma_addr_t dma_addr,
size_t size)
{
return swiotlb_force != SWIOTLB_FORCE &&
(!dev || dma_capable(dev, dma_addr, size));
dma_capable(dev, dma_addr, size);
}
dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,

9
kernel/dma/mapping.c
View file

@ -238,17 +238,13 @@ u64 dma_get_required_mask(struct device *dev)
}
EXPORT_SYMBOL_GPL(dma_get_required_mask);
#ifndef arch_dma_alloc_attrs
#define arch_dma_alloc_attrs(dev) (true)
#endif
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 && !dev->coherent_dma_mask);
WARN_ON_ONCE(!dev->coherent_dma_mask);
if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr))
return cpu_addr;
@ -256,9 +252,6 @@ void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle,
/* let the implementation decide on the zone to allocate from: */
flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
if (!arch_dma_alloc_attrs(&dev))
return NULL;
if (dma_is_direct(ops))
cpu_addr = dma_direct_alloc(dev, size, dma_handle, flag, attrs);
else if (ops->alloc)