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dma-coherent: remove the DMA_MEMORY_MAP and DMA_MEMORY_IO flags

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DMA_MEMORY_IO was never used in the tree, so remove it.  That means there is
no need for the DMA_MEMORY_MAP flag either now, so remove it as well and
change dma_declare_coherent_memory to return a normal errno value.

Signed-off-by: Christoph Hellwig <hch@lst.de>
 Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Christoph Hellwig 2017-08-25 17:13:09 +02:00
parent b32dbc1e0b
commit 2436bdcda5
11 changed files with 52 additions and 111 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

21
Documentation/DMA-API.txt
View file

@ -592,30 +592,11 @@ size is the size of the area (must be multiples of PAGE_SIZE).
flags can be ORed together and are:
- DMA_MEMORY_MAP - request that the memory returned from
dma_alloc_coherent() be directly writable.
- DMA_MEMORY_IO - request that the memory returned from
dma_alloc_coherent() be addressable using read()/write()/memcpy_toio() etc.
One or both of these flags must be present.
- DMA_MEMORY_EXCLUSIVE - only allocate memory from the declared regions.
Do not allow dma_alloc_coherent() to fall back to system memory when
it's out of memory in the declared region.
The return value will be either DMA_MEMORY_MAP or DMA_MEMORY_IO and
must correspond to a passed in flag (i.e. no returning DMA_MEMORY_IO
if only DMA_MEMORY_MAP were passed in) for success or zero for
failure.
Note, for DMA_MEMORY_IO returns, all subsequent memory returned by
dma_alloc_coherent() may no longer be accessed directly, but instead
must be accessed using the correct bus functions. If your driver
isn't prepared to handle this contingency, it should not specify
DMA_MEMORY_IO in the input flags.
As a simplification for the platforms, only **one** such region of
As a simplification for the platforms, only *one* such region of
memory may be declared per device.
For reasons of efficiency, most platforms choose to track the declared

44
arch/arm/mach-imx/mach-imx27_visstrim_m10.c
View file

@ -245,7 +245,6 @@ static phys_addr_t mx2_camera_base __initdata;
static void __init visstrim_analog_camera_init(void)
{
struct platform_device *pdev;
int dma;
gpio_set_value(TVP5150_PWDN, 1);
ndelay(1);
@ -258,12 +257,9 @@ static void __init visstrim_analog_camera_init(void)
if (IS_ERR(pdev))
return;
dma = dma_declare_coherent_memory(&pdev->dev,
mx2_camera_base, mx2_camera_base,
MX2_CAMERA_BUF_SIZE,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE);
if (!(dma & DMA_MEMORY_MAP))
return;
dma_declare_coherent_memory(&pdev->dev, mx2_camera_base,
mx2_camera_base, MX2_CAMERA_BUF_SIZE,
DMA_MEMORY_EXCLUSIVE);
}
static void __init visstrim_reserve(void)
@ -444,16 +440,13 @@ static const struct imx_ssi_platform_data visstrim_m10_ssi_pdata __initconst = {
static void __init visstrim_coda_init(void)
{
struct platform_device *pdev;
int dma;
pdev = imx27_add_coda();
dma = dma_declare_coherent_memory(&pdev->dev,
mx2_camera_base + MX2_CAMERA_BUF_SIZE,
mx2_camera_base + MX2_CAMERA_BUF_SIZE,
MX2_CAMERA_BUF_SIZE,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE);
if (!(dma & DMA_MEMORY_MAP))
return;
dma_declare_coherent_memory(&pdev->dev,
mx2_camera_base + MX2_CAMERA_BUF_SIZE,
mx2_camera_base + MX2_CAMERA_BUF_SIZE,
MX2_CAMERA_BUF_SIZE,
DMA_MEMORY_EXCLUSIVE);
}
/* DMA deinterlace */
@ -466,24 +459,21 @@ static void __init visstrim_deinterlace_init(void)
{
int ret = -ENOMEM;
struct platform_device *pdev = &visstrim_deinterlace;
int dma;
ret = platform_device_register(pdev);
dma = dma_declare_coherent_memory(&pdev->dev,
mx2_camera_base + 2 * MX2_CAMERA_BUF_SIZE,
mx2_camera_base + 2 * MX2_CAMERA_BUF_SIZE,
MX2_CAMERA_BUF_SIZE,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE);
if (!(dma & DMA_MEMORY_MAP))
return;
dma_declare_coherent_memory(&pdev->dev,
mx2_camera_base + 2 * MX2_CAMERA_BUF_SIZE,
mx2_camera_base + 2 * MX2_CAMERA_BUF_SIZE,
MX2_CAMERA_BUF_SIZE,
DMA_MEMORY_EXCLUSIVE);
}
/* Emma-PrP for format conversion */
static void __init visstrim_emmaprp_init(void)
{
struct platform_device *pdev;
int dma;
int ret;
pdev = imx27_add_mx2_emmaprp();
if (IS_ERR(pdev))
@ -493,11 +483,11 @@ static void __init visstrim_emmaprp_init(void)
* Use the same memory area as the analog camera since both
* devices are, by nature, exclusive.
*/
dma = dma_declare_coherent_memory(&pdev->dev,
ret = dma_declare_coherent_memory(&pdev->dev,
mx2_camera_base, mx2_camera_base,
MX2_CAMERA_BUF_SIZE,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE);
if (!(dma & DMA_MEMORY_MAP))
DMA_MEMORY_EXCLUSIVE);
if (ret)
pr_err("Failed to declare memory for emmaprp\n");
}

12
arch/arm/mach-imx/mach-mx31moboard.c
View file

@ -475,7 +475,7 @@ static phys_addr_t mx3_camera_base __initdata;
static int __init mx31moboard_init_cam(void)
{
int dma, ret = -ENOMEM;
int dma, ret;
struct platform_device *pdev;
imx31_add_ipu_core();
@ -484,11 +484,11 @@ static int __init mx31moboard_init_cam(void)
if (IS_ERR(pdev))
return PTR_ERR(pdev);
dma = dma_declare_coherent_memory(&pdev->dev,
mx3_camera_base, mx3_camera_base,
MX3_CAMERA_BUF_SIZE,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE);
if (!(dma & DMA_MEMORY_MAP))
ret = dma_declare_coherent_memory(&pdev->dev,
mx3_camera_base, mx3_camera_base,
MX3_CAMERA_BUF_SIZE,
DMA_MEMORY_EXCLUSIVE);
if (ret)
goto err;
ret = platform_device_add(pdev);

3
arch/sh/drivers/pci/fixups-dreamcast.c
View file

@ -63,11 +63,10 @@ static void gapspci_fixup_resources(struct pci_dev *dev)
res.end = GAPSPCI_DMA_BASE + GAPSPCI_DMA_SIZE - 1;
res.flags = IORESOURCE_MEM;
pcibios_resource_to_bus(dev->bus, &region, &res);
BUG_ON(!dma_declare_coherent_memory(&dev->dev,
BUG_ON(dma_declare_coherent_memory(&dev->dev,
res.start,
region.start,
resource_size(&res),
DMA_MEMORY_MAP |
DMA_MEMORY_EXCLUSIVE));
break;
default:

46
drivers/base/dma-coherent.c
View file

@ -46,15 +46,10 @@ static bool dma_init_coherent_memory(
int pages = size >> PAGE_SHIFT;
int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
goto out;
if (!size)
goto out;
if (flags & DMA_MEMORY_MAP)
mem_base = memremap(phys_addr, size, MEMREMAP_WC);
else
mem_base = ioremap(phys_addr, size);
mem_base = memremap(phys_addr, size, MEMREMAP_WC);
if (!mem_base)
goto out;
@ -77,12 +72,8 @@ static bool dma_init_coherent_memory(
out:
kfree(dma_mem);
if (mem_base) {
if (flags & DMA_MEMORY_MAP)
memunmap(mem_base);
else
iounmap(mem_base);
}
if (mem_base)
memunmap(mem_base);
return false;
}
@ -91,10 +82,7 @@ static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
if (!mem)
return;
if (mem->flags & DMA_MEMORY_MAP)
memunmap(mem->virt_base);
else
iounmap(mem->virt_base);
memunmap(mem->virt_base);
kfree(mem->bitmap);
kfree(mem);
}
@ -116,16 +104,16 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
dma_addr_t device_addr, size_t size, int flags)
{
struct dma_coherent_mem *mem;
int ret;
if (!dma_init_coherent_memory(phys_addr, device_addr, size, flags,
&mem))
return 0;
ret = dma_init_coherent_memory(phys_addr, device_addr, size, flags, &mem);
if (ret)
return ret;
if (dma_assign_coherent_memory(dev, mem) == 0)
return flags & DMA_MEMORY_MAP ? DMA_MEMORY_MAP : DMA_MEMORY_IO;
dma_release_coherent_memory(mem);
return 0;
ret = dma_assign_coherent_memory(dev, mem);
if (ret)
dma_release_coherent_memory(mem);
return ret;
}
EXPORT_SYMBOL(dma_declare_coherent_memory);
@ -186,15 +174,9 @@ static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem,
*/
*dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
ret = mem->virt_base + (pageno << PAGE_SHIFT);
dma_memory_map = (mem->flags & DMA_MEMORY_MAP);
spin_unlock_irqrestore(&mem->spinlock, flags);
if (dma_memory_map)
memset(ret, 0, size);
else
memset_io(ret, 0, size);
memset(ret, 0, size);
return ret;
err:
spin_unlock_irqrestore(&mem->spinlock, flags);
return NULL;
@ -360,7 +342,7 @@ static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
if (!mem &&
!dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
DMA_MEMORY_EXCLUSIVE,
&mem)) {
pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
&rmem->base, (unsigned long)rmem->size / SZ_1M);

7
drivers/base/dma-mapping.c
View file

@ -176,13 +176,10 @@ int dmam_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
rc = dma_declare_coherent_memory(dev, phys_addr, device_addr, size,
flags);
if (rc) {
if (!rc)
devres_add(dev, res);
rc = 0;
} else {
else
devres_free(res);
rc = -ENOMEM;
}
return rc;
}

5
drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c
View file

@ -1708,11 +1708,10 @@ static int sh_mobile_ceu_probe(struct platform_device *pdev)
err = dma_declare_coherent_memory(&pdev->dev, res->start,
res->start,
resource_size(res),
DMA_MEMORY_MAP |
DMA_MEMORY_EXCLUSIVE);
if (!err) {
if (err) {
dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
return -ENXIO;
return err;
}
pcdev->video_limit = resource_size(res);

3
drivers/scsi/NCR_Q720.c
View file

@ -217,8 +217,7 @@ NCR_Q720_probe(struct device *dev)
}
if (dma_declare_coherent_memory(dev, base_addr, base_addr,
mem_size, DMA_MEMORY_MAP)
!= DMA_MEMORY_MAP) {
mem_size, 0)) {
printk(KERN_ERR "NCR_Q720: DMA declare memory failed\n");
goto out_release_region;
}

7
drivers/usb/host/ohci-sm501.c
View file

@ -123,13 +123,12 @@ static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev)
* regular memory. The HCD_LOCAL_MEM flag does just that.
*/
if (!dma_declare_coherent_memory(dev, mem->start,
retval = dma_declare_coherent_memory(dev, mem->start,
mem->start - mem->parent->start,
resource_size(mem),
DMA_MEMORY_MAP |
DMA_MEMORY_EXCLUSIVE)) {
DMA_MEMORY_EXCLUSIVE);
if (retval) {
dev_err(dev, "cannot declare coherent memory\n");
retval = -ENXIO;
goto err1;
}

9
drivers/usb/host/ohci-tmio.c
View file

@ -227,13 +227,10 @@ static int ohci_hcd_tmio_drv_probe(struct platform_device *dev)
goto err_ioremap_regs;
}
if (!dma_declare_coherent_memory(&dev->dev, sram->start,
sram->start,
resource_size(sram),
DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE)) {
ret = -EBUSY;
ret = dma_declare_coherent_memory(&dev->dev, sram->start, sram->start,
resource_size(sram), DMA_MEMORY_EXCLUSIVE);
if (ret)
goto err_dma_declare;
}
if (cell->enable) {
ret = cell->enable(dev);

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

@ -694,9 +694,7 @@ static inline int dma_get_cache_alignment(void)
#endif
/* flags for the coherent memory api */
#define DMA_MEMORY_MAP 0x01
#define DMA_MEMORY_IO 0x02
#define DMA_MEMORY_EXCLUSIVE 0x04
#define DMA_MEMORY_EXCLUSIVE 0x01
#ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT
int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
@ -709,7 +707,7 @@ static inline int
dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
dma_addr_t device_addr, size_t size, int flags)
{
return 0;
return -ENOSYS;
}
static inline void