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dma mapping changes for Linux 4.16:

Browse source 
This pull requests contains a consolidation of the generic no-IOMMU code,
 a well as the glue code for swiotlb.  All the code is based on the x86
 implementation with hooks to allow all architectures that aren't cache
 coherent to use it.  The x86 conversion itself has been deferred because
 the x86 maintainers were a little busy in the last months.
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Merge tag 'dma-mapping-4.16' of git://git.infradead.org/users/hch/dma-mapping

Pull dma mapping updates from Christoph Hellwig:
 "Except for a runtime warning fix from Christian this is all about
  consolidation of the generic no-IOMMU code, a well as the glue code
  for swiotlb.

  All the code is based on the x86 implementation with hooks to allow
  all architectures that aren't cache coherent to use it.

  The x86 conversion itself has been deferred because the x86
  maintainers were a little busy in the last months"

* tag 'dma-mapping-4.16' of git://git.infradead.org/users/hch/dma-mapping: (57 commits)
  MAINTAINERS: add the iommu list for swiotlb and xen-swiotlb
  arm64: use swiotlb_alloc and swiotlb_free
  arm64: replace ZONE_DMA with ZONE_DMA32
  mips: use swiotlb_{alloc,free}
  mips/netlogic: remove swiotlb support
  tile: use generic swiotlb_ops
  tile: replace ZONE_DMA with ZONE_DMA32
  unicore32: use generic swiotlb_ops
  ia64: remove an ifdef around the content of pci-dma.c
  ia64: clean up swiotlb support
  ia64: use generic swiotlb_ops
  ia64: replace ZONE_DMA with ZONE_DMA32
  swiotlb: remove various exports
  swiotlb: refactor coherent buffer allocation
  swiotlb: refactor coherent buffer freeing
  swiotlb: wire up ->dma_supported in swiotlb_dma_ops
  swiotlb: add common swiotlb_map_ops
  swiotlb: rename swiotlb_free to swiotlb_exit
  x86: rename swiotlb_dma_ops
  powerpc: rename swiotlb_dma_ops
  ...
This commit is contained in:
Linus Torvalds 2018-01-31 11:32:27 -08:00
commit 2382dc9a3e
119 changed files with 728 additions and 1266 deletions
Download patch file Download diff file Expand all files Collapse all files

4
arch/cris/Kconfig
View file

@ -33,6 +33,9 @@ config GENERIC_CALIBRATE_DELAY
config NO_IOPORT_MAP
def_bool y if !PCI
config NO_DMA
def_bool y if !PCI
config FORCE_MAX_ZONEORDER
int
default 6
@ -72,6 +75,7 @@ config CRIS
select GENERIC_SCHED_CLOCK if ETRAX_ARCH_V32
select HAVE_DEBUG_BUGVERBOSE if ETRAX_ARCH_V32
select HAVE_NMI
select DMA_DIRECT_OPS if PCI
config HZ
int

2
arch/cris/arch-v32/drivers/pci/Makefile
View file

@ -2,4 +2,4 @@
# Makefile for Etrax cardbus driver
#
obj-$(CONFIG_ETRAX_CARDBUS) += bios.o dma.o
obj-$(CONFIG_ETRAX_CARDBUS) += bios.o

80
arch/cris/arch-v32/drivers/pci/dma.c
View file

@ -1,80 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Dynamic DMA mapping support.
*
* On cris there is no hardware dynamic DMA address translation,
* so consistent alloc/free are merely page allocation/freeing.
* The rest of the dynamic DMA mapping interface is implemented
* in asm/pci.h.
*
* Borrowed from i386.
*/
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/pci.h>
#include <linux/gfp.h>
#include <asm/io.h>
static void *v32_dma_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
void *ret;
/* ignore region specifiers */
gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
if (dev == NULL || (dev->coherent_dma_mask < 0xffffffff))
gfp |= GFP_DMA;
ret = (void *)__get_free_pages(gfp, get_order(size));
if (ret != NULL) {
memset(ret, 0, size);
*dma_handle = virt_to_phys(ret);
}
return ret;
}
static void v32_dma_free(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
free_pages((unsigned long)vaddr, get_order(size));
}
static inline dma_addr_t v32_dma_map_page(struct device *dev,
struct page *page, unsigned long offset, size_t size,
enum dma_data_direction direction, unsigned long attrs)
{
return page_to_phys(page) + offset;
}
static inline int v32_dma_map_sg(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction direction,
unsigned long attrs)
{
printk("Map sg\n");
return nents;
}
static inline int v32_dma_supported(struct device *dev, u64 mask)
{
/*
* we fall back to GFP_DMA when the mask isn't all 1s,
* so we can't guarantee allocations that must be
* within a tighter range than GFP_DMA..
*/
if (mask < 0x00ffffff)
return 0;
return 1;
}
const struct dma_map_ops v32_dma_ops = {
.alloc = v32_dma_alloc,
.free = v32_dma_free,
.map_page = v32_dma_map_page,
.map_sg = v32_dma_map_sg,
.dma_supported = v32_dma_supported,
};
EXPORT_SYMBOL(v32_dma_ops);

1
arch/cris/include/asm/Kbuild
View file

@ -5,6 +5,7 @@ generic-y += cmpxchg.h
generic-y += current.h
generic-y += device.h
generic-y += div64.h
generic-y += dma-mapping.h
generic-y += emergency-restart.h
generic-y += exec.h
generic-y += extable.h

20
arch/cris/include/asm/dma-mapping.h
View file

@ -1,20 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_CRIS_DMA_MAPPING_H
#define _ASM_CRIS_DMA_MAPPING_H
#ifdef CONFIG_PCI
extern const struct dma_map_ops v32_dma_ops;
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
return &v32_dma_ops;
}
#else
static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
{
BUG();
return NULL;
}
#endif
#endif