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PCI: remove pci_dac_dma_... APIs

Browse Source 
Based on replies to a respective query, remove the pci_dac_dma_...() APIs
(except for pci_dac_dma_supported() on Alpha, where this function is used
in non-DAC PCI DMA code).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Jesse Barnes <jesse.barnes@intel.com>
Cc: Christoph Hellwig <hch@infradead.org>
Acked-by: David Miller <davem@davemloft.net>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jan Beulich 2007-07-09 11:55:51 -07:00 committed by Greg Kroah-Hartman
parent b7b095c154
commit caa5171622
24 changed files with 7 additions and 464 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

103
Documentation/DMA-mapping.txt
View File

@ -664,109 +664,6 @@ It is that simple.
Well, not for some odd devices. See the next section for information
about that.
DAC Addressing for Address Space Hungry Devices
There exists a class of devices which do not mesh well with the PCI
DMA mapping API. By definition these "mappings" are a finite
resource. The number of total available mappings per bus is platform
specific, but there will always be a reasonable amount.
What is "reasonable"? Reasonable means that networking and block I/O
devices need not worry about using too many mappings.
As an example of a problematic device, consider compute cluster cards.
They can potentially need to access gigabytes of memory at once via
DMA. Dynamic mappings are unsuitable for this kind of access pattern.
To this end we've provided a small API by which a device driver
may use DAC cycles to directly address all of physical memory.
Not all platforms support this, but most do. It is easy to determine
whether the platform will work properly at probe time.
First, understand that there may be a SEVERE performance penalty for
using these interfaces on some platforms. Therefore, you MUST only
use these interfaces if it is absolutely required. %99 of devices can
use the normal APIs without any problems.
Note that for streaming type mappings you must either use these
interfaces, or the dynamic mapping interfaces above. You may not mix
usage of both for the same device. Such an act is illegal and is
guaranteed to put a banana in your tailpipe.
However, consistent mappings may in fact be used in conjunction with
these interfaces. Remember that, as defined, consistent mappings are
always going to be SAC addressable.
The first thing your driver needs to do is query the PCI platform
layer if it is capable of handling your devices DAC addressing
capabilities:
int pci_dac_dma_supported(struct pci_dev *hwdev, u64 mask);
You may not use the following interfaces if this routine fails.
Next, DMA addresses using this API are kept track of using the
dma64_addr_t type. It is guaranteed to be big enough to hold any
DAC address the platform layer will give to you from the following
routines. If you have consistent mappings as well, you still
use plain dma_addr_t to keep track of those.
All mappings obtained here will be direct. The mappings are not
translated, and this is the purpose of this dialect of the DMA API.
All routines work with page/offset pairs. This is the _ONLY_ way to
portably refer to any piece of memory. If you have a cpu pointer
(which may be validly DMA'd too) you may easily obtain the page
and offset using something like this:
struct page *page = virt_to_page(ptr);
unsigned long offset = offset_in_page(ptr);
Here are the interfaces:
dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
struct page *page,
unsigned long offset,
int direction);
The DAC address for the tuple PAGE/OFFSET are returned. The direction
argument is the same as for pci_{map,unmap}_single(). The same rules
for cpu/device access apply here as for the streaming mapping
interfaces. To reiterate:
The cpu may touch the buffer before pci_dac_page_to_dma.
The device may touch the buffer after pci_dac_page_to_dma
is made, but the cpu may NOT.
When the DMA transfer is complete, invoke:
void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
dma64_addr_t dma_addr,
size_t len, int direction);
This must be done before the CPU looks at the buffer again.
This interface behaves identically to pci_dma_sync_{single,sg}_for_cpu().
And likewise, if you wish to let the device get back at the buffer after
the cpu has read/written it, invoke:
void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
dma64_addr_t dma_addr,
size_t len, int direction);
before letting the device access the DMA area again.
If you need to get back to the PAGE/OFFSET tuple from a dma64_addr_t
the following interfaces are provided:
struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
dma64_addr_t dma_addr);
unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
dma64_addr_t dma_addr);
This is possible with the DAC interfaces purely because they are
not translated in any way.
Optimizing Unmap State Space Consumption
On many platforms, pci_unmap_{single,page}() is simply a nop.

32
arch/alpha/kernel/pci_iommu.c
View File

@ -207,6 +207,10 @@ iommu_arena_free(struct pci_iommu_arena *arena, long ofs, long n)
p[i] = 0;
}
/* True if the machine supports DAC addressing, and DEV can
make use of it given MASK. */
static int pci_dac_dma_supported(struct pci_dev *hwdev, u64 mask);
/* Map a single buffer of the indicated size for PCI DMA in streaming
mode. The 32-bit PCI bus mastering address to use is returned.
Once the device is given the dma address, the device owns this memory
@ -897,7 +901,7 @@ iommu_unbind(struct pci_iommu_arena *arena, long pg_start, long pg_count)
/* True if the machine supports DAC addressing, and DEV can
make use of it given MASK. */
int
static int
pci_dac_dma_supported(struct pci_dev *dev, u64 mask)
{
dma64_addr_t dac_offset = alpha_mv.pci_dac_offset;
@ -917,32 +921,6 @@ pci_dac_dma_supported(struct pci_dev *dev, u64 mask)
return ok;
}
EXPORT_SYMBOL(pci_dac_dma_supported);
dma64_addr_t
pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page,
unsigned long offset, int direction)
{
return (alpha_mv.pci_dac_offset
+ __pa(page_address(page))
+ (dma64_addr_t) offset);
}
EXPORT_SYMBOL(pci_dac_page_to_dma);
struct page *
pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
unsigned long paddr = (dma_addr & PAGE_MASK) - alpha_mv.pci_dac_offset;
return virt_to_page(__va(paddr));
}
EXPORT_SYMBOL(pci_dac_dma_to_page);
unsigned long
pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
return (dma_addr & ~PAGE_MASK);
}
EXPORT_SYMBOL(pci_dac_dma_to_offset);
/* Helper for generic DMA-mapping functions. */

2
arch/mips/pci/Makefile
View File

@ -2,7 +2,7 @@
# Makefile for the PCI specific kernel interface routines under Linux.
#
obj-y += pci.o pci-dac.o
obj-y += pci.o
#
# PCI bus host bridge specific code

79
arch/mips/pci/pci-dac.c
View File

@ -1,79 +0,0 @@
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2000 Ani Joshi <ajoshi@unixbox.com>
* Copyright (C) 2000, 2001, 06 Ralf Baechle <ralf@linux-mips.org>
* swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
*/
#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/cache.h>
#include <asm/io.h>
#include <dma-coherence.h>
#include <linux/pci.h>
dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
struct page *page, unsigned long offset, int direction)
{
struct device *dev = &pdev->dev;
BUG_ON(direction == DMA_NONE);
if (!plat_device_is_coherent(dev)) {
unsigned long addr;
addr = (unsigned long) page_address(page) + offset;
dma_cache_wback_inv(addr, PAGE_SIZE);
}
return plat_map_dma_mem_page(dev, page) + offset;
}
EXPORT_SYMBOL(pci_dac_page_to_dma);
struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
dma64_addr_t dma_addr)
{
return pfn_to_page(plat_dma_addr_to_phys(dma_addr) >> PAGE_SHIFT);
}
EXPORT_SYMBOL(pci_dac_dma_to_page);
unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
dma64_addr_t dma_addr)
{
return dma_addr & ~PAGE_MASK;
}
EXPORT_SYMBOL(pci_dac_dma_to_offset);
void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
dma64_addr_t dma_addr, size_t len, int direction)
{
BUG_ON(direction == PCI_DMA_NONE);
if (!plat_device_is_coherent(&pdev->dev))
dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
}
EXPORT_SYMBOL(pci_dac_dma_sync_single_for_cpu);
void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
dma64_addr_t dma_addr, size_t len, int direction)
{
BUG_ON(direction == PCI_DMA_NONE);
if (!plat_device_is_coherent(&pdev->dev))
dma_cache_wback_inv(dma_addr + PAGE_OFFSET, len);
}
EXPORT_SYMBOL(pci_dac_dma_sync_single_for_device);

3
arch/x86_64/kernel/pci-dma.c
View File

@ -22,8 +22,7 @@ EXPORT_SYMBOL(bad_dma_address);
int iommu_bio_merge __read_mostly = 0;
EXPORT_SYMBOL(iommu_bio_merge);
int iommu_sac_force __read_mostly = 0;
EXPORT_SYMBOL(iommu_sac_force);
static int iommu_sac_force __read_mostly = 0;
int no_iommu __read_mostly;
#ifdef CONFIG_IOMMU_DEBUG

24
include/asm-alpha/pci.h
View File

@ -199,30 +199,6 @@ pci_dma_sync_sg_for_device(struct pci_dev *dev, struct scatterlist *sg,
extern int pci_dma_supported(struct pci_dev *hwdev, u64 mask);
/* True if the machine supports DAC addressing, and DEV can
make use of it given MASK. */
extern int pci_dac_dma_supported(struct pci_dev *hwdev, u64 mask);
/* Convert to/from DAC dma address and struct page. */
extern dma64_addr_t pci_dac_page_to_dma(struct pci_dev *, struct page *,
unsigned long, int);
extern struct page *pci_dac_dma_to_page(struct pci_dev *, dma64_addr_t);
extern unsigned long pci_dac_dma_to_offset(struct pci_dev *, dma64_addr_t);
static inline void
pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr,
size_t len, int direction)
{
/* Nothing to do. */
}
static inline void
pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr,
size_t len, int direction)
{
/* Nothing to do. */
}
#ifdef CONFIG_PCI
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
enum pci_dma_burst_strategy *strat,

5
include/asm-arm/pci.h
View File

@ -25,11 +25,6 @@ static inline void pcibios_penalize_isa_irq(int irq, int active)
*/
#define PCI_DMA_BUS_IS_PHYS (0)
/*
* We don't support DAC DMA cycles.
*/
#define pci_dac_dma_supported(pci_dev, mask) (0)
/*
* Whether pci_unmap_{single,page} is a nop depends upon the
* configuration.

32
include/asm-cris/pci.h
View File

@ -52,38 +52,6 @@ struct pci_dev;
#define pci_unmap_len(PTR, LEN_NAME) (0)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
/* This is always fine. */
#define pci_dac_dma_supported(pci_dev, mask) (1)
static inline dma64_addr_t
pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
{
return ((dma64_addr_t) page_to_phys(page) +
(dma64_addr_t) offset);
}
static inline struct page *
pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
return pfn_to_page(dma_addr >> PAGE_SHIFT);
}
static inline unsigned long
pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
return (dma_addr & ~PAGE_MASK);
}
static inline void
pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
}
static inline void
pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
}
#define HAVE_PCI_MMAP
extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine);

3
include/asm-frv/pci.h
View File

@ -40,9 +40,6 @@ extern void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
extern void pci_free_consistent(struct pci_dev *hwdev, size_t size,
void *vaddr, dma_addr_t dma_handle);
/* This is always fine. */
#define pci_dac_dma_supported(pci_dev, mask) (1)
/* Return the index of the PCI controller for device PDEV. */
#define pci_controller_num(PDEV) (0)

33
include/asm-i386/pci.h
View File

@ -56,39 +56,6 @@ struct pci_dev;
#define pci_unmap_len(PTR, LEN_NAME) (0)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
/* This is always fine. */
#define pci_dac_dma_supported(pci_dev, mask) (1)
static inline dma64_addr_t
pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
{
return ((dma64_addr_t) page_to_phys(page) +
(dma64_addr_t) offset);
}
static inline struct page *
pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
return pfn_to_page(dma_addr >> PAGE_SHIFT);
}
static inline unsigned long
pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
return (dma_addr & ~PAGE_MASK);
}
static inline void
pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
}
static inline void
pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
flush_write_buffers();
}
#define HAVE_PCI_MMAP
extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine);

8
include/asm-ia64/pci.h
View File

@ -71,14 +71,6 @@ pcibios_penalize_isa_irq (int irq, int active)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL) \
(((PTR)->LEN_NAME) = (VAL))
/* The ia64 platform always supports 64-bit addressing. */
#define pci_dac_dma_supported(pci_dev, mask) (1)
#define pci_dac_page_to_dma(dev,pg,off,dir) ((dma_addr_t) page_to_bus(pg) + (off))
#define pci_dac_dma_to_page(dev,dma_addr) (virt_to_page(bus_to_virt(dma_addr)))
#define pci_dac_dma_to_offset(dev,dma_addr) offset_in_page(dma_addr)
#define pci_dac_dma_sync_single_for_cpu(dev,dma_addr,len,dir) do { } while (0)
#define pci_dac_dma_sync_single_for_device(dev,dma_addr,len,dir) do { mb(); } while (0)
#ifdef CONFIG_PCI
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
enum pci_dma_burst_strategy *strat,

6
include/asm-m68knommu/pci.h
View File

@ -24,12 +24,6 @@ static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
return 1;
}
/*
* Not supporting more than 32-bit PCI bus addresses now, but
* must satisfy references to this function. Change if needed.
*/
#define pci_dac_dma_supported(pci_dev, mask) (0)
#endif /* CONFIG_COMEMPCI */
#endif /* M68KNOMMU_PCI_H */

14
include/asm-mips/pci.h
View File

@ -121,20 +121,6 @@ extern unsigned int PCI_DMA_BUS_IS_PHYS;
#endif /* CONFIG_DMA_NEED_PCI_MAP_STATE */
/* This is always fine. */
#define pci_dac_dma_supported(pci_dev, mask) (1)
extern dma64_addr_t pci_dac_page_to_dma(struct pci_dev *pdev,
struct page *page, unsigned long offset, int direction);
extern struct page *pci_dac_dma_to_page(struct pci_dev *pdev,
dma64_addr_t dma_addr);
extern unsigned long pci_dac_dma_to_offset(struct pci_dev *pdev,
dma64_addr_t dma_addr);
extern void pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev,
dma64_addr_t dma_addr, size_t len, int direction);
extern void pci_dac_dma_sync_single_for_device(struct pci_dev *pdev,
dma64_addr_t dma_addr, size_t len, int direction);
#ifdef CONFIG_PCI
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
enum pci_dma_burst_strategy *strat,

3
include/asm-parisc/pci.h
View File

@ -238,9 +238,6 @@ extern inline void pcibios_register_hba(struct pci_hba_data *x)
#define PCIBIOS_MIN_IO 0x10
#define PCIBIOS_MIN_MEM 0x1000 /* NBPG - but pci/setup-res.c dies */
/* Don't support DAC yet. */
#define pci_dac_dma_supported(pci_dev, mask) (0)
/* export the pci_ DMA API in terms of the dma_ one */
#include <asm-generic/pci-dma-compat.h>

1
include/asm-powerpc/dma-mapping.h
View File

@ -61,7 +61,6 @@ struct dma_mapping_ops {
void (*unmap_sg)(struct device *dev, struct scatterlist *sg,
int nents, enum dma_data_direction direction);
int (*dma_supported)(struct device *dev, u64 mask);
int (*dac_dma_supported)(struct device *dev, u64 mask);
int (*set_dma_mask)(struct device *dev, u64 dma_mask);
};

18
include/asm-powerpc/pci.h
View File

@ -74,18 +74,6 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
extern void set_pci_dma_ops(struct dma_mapping_ops *dma_ops);
extern struct dma_mapping_ops *get_pci_dma_ops(void);
/* For DAC DMA, we currently don't support it by default, but
* we let 64-bit platforms override this.
*/
static inline int pci_dac_dma_supported(struct pci_dev *hwdev,u64 mask)
{
struct dma_mapping_ops *d = get_pci_dma_ops();
if (d && d->dac_dma_supported)
return d->dac_dma_supported(&hwdev->dev, mask);
return 0;
}
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
enum pci_dma_burst_strategy *strat,
unsigned long *strategy_parameter)
@ -124,12 +112,6 @@ static inline void pci_dma_burst_advice(struct pci_dev *pdev,
}
#endif
/*
* At present there are very few 32-bit PPC machines that can have
* memory above the 4GB point, and we don't support that.
*/
#define pci_dac_dma_supported(pci_dev, mask) (0)
/* Return the index of the PCI controller for device PDEV. */
#define pci_domain_nr(bus) ((struct pci_controller *)(bus)->sysdata)->index

6
include/asm-ppc/pci.h
View File

@ -102,12 +102,6 @@ static inline void pci_dma_burst_advice(struct pci_dev *pdev,
}
#endif
/*
* At present there are very few 32-bit PPC machines that can have
* memory above the 4GB point, and we don't support that.
*/
#define pci_dac_dma_supported(pci_dev, mask) (0)
/* Return the index of the PCI controller for device PDEV. */
#define pci_domain_nr(bus) ((struct pci_controller *)(bus)->sysdata)->index

5
include/asm-sh/pci.h
View File

@ -110,11 +110,6 @@ static inline void pcibios_penalize_isa_irq(int irq, int active)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
#endif
/* Not supporting more than 32-bit PCI bus addresses now, but
* must satisfy references to this function. Change if needed.
*/
#define pci_dac_dma_supported(pci_dev, mask) (0)
#ifdef CONFIG_PCI
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
enum pci_dma_burst_strategy *strat,

5
include/asm-sh64/pci.h
View File

@ -72,11 +72,6 @@ static inline void pcibios_penalize_isa_irq(int irq, int active)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
#endif
/* Not supporting more than 32-bit PCI bus addresses now, but
* must satisfy references to this function. Change if needed.
*/
#define pci_dac_dma_supported(pci_dev, mask) (0)
/* These macros should be used after a pci_map_sg call has been done
* to get bus addresses of each of the SG entries and their lengths.
* You should only work with the number of sg entries pci_map_sg

2
include/asm-sparc/pci.h
View File

@ -142,8 +142,6 @@ static inline int pci_dma_supported(struct pci_dev *hwdev, u64 mask)
return 1;
}
#define pci_dac_dma_supported(dev, mask) (0)
#ifdef CONFIG_PCI
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
enum pci_dma_burst_strategy *strat,

43
include/asm-sparc64/pci.h
View File

@ -206,49 +206,6 @@ extern int pci_dma_supported(struct pci_dev *hwdev, u64 mask);
#define PCI64_REQUIRED_MASK (~(dma64_addr_t)0)
#define PCI64_ADDR_BASE 0xfffc000000000000UL
/* Usage of the pci_dac_foo interfaces is only valid if this
* test passes.
*/
#define pci_dac_dma_supported(pci_dev, mask) \
((((mask) & PCI64_REQUIRED_MASK) == PCI64_REQUIRED_MASK) ? 1 : 0)
static inline dma64_addr_t
pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
{
return (PCI64_ADDR_BASE +
__pa(page_address(page)) + offset);
}
static inline struct page *
pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
unsigned long paddr = (dma_addr & PAGE_MASK) - PCI64_ADDR_BASE;
return virt_to_page(__va(paddr));
}
static inline unsigned long
pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
return (dma_addr & ~PAGE_MASK);
}
static inline void
pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
/* DAC cycle addressing does not make use of the
* PCI controller's streaming cache, so nothing to do.
*/
}
static inline void
pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
/* DAC cycle addressing does not make use of the
* PCI controller's streaming cache, so nothing to do.
*/
}
#define PCI_DMA_ERROR_CODE (~(dma_addr_t)0x0)
static inline int pci_dma_mapping_error(dma_addr_t dma_addr)

1
include/asm-v850/rte_cb.h
View File

@ -64,7 +64,6 @@
/* As we don't really support PCI DMA to cpu memory, and use bounce-buffers
instead, perversely enough, this becomes always true! */
# define pci_dma_supported(dev, mask) 1
# define pci_dac_dma_supported(dev, mask) 0
# define pcibios_assign_all_busses() 1
#endif /* CONFIG_RTE_MB_A_PCI */

40
include/asm-x86_64/pci.h
View File

@ -54,14 +54,6 @@ extern int iommu_setup(char *opt);
#if defined(CONFIG_IOMMU) || defined(CONFIG_CALGARY_IOMMU)
/*
* x86-64 always supports DAC, but sometimes it is useful to force
* devices through the IOMMU to get automatic sg list merging.
* Optional right now.
*/
extern int iommu_sac_force;
#define pci_dac_dma_supported(pci_dev, mask) (!iommu_sac_force)
#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME) \
dma_addr_t ADDR_NAME;
#define DECLARE_PCI_UNMAP_LEN(LEN_NAME) \
@ -78,8 +70,6 @@ extern int iommu_sac_force;
#else
/* No IOMMU */
#define pci_dac_dma_supported(pci_dev, mask) 1
#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)
#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)
#define pci_unmap_addr(PTR, ADDR_NAME) (0)
@ -91,36 +81,6 @@ extern int iommu_sac_force;
#include <asm-generic/pci-dma-compat.h>
static inline dma64_addr_t
pci_dac_page_to_dma(struct pci_dev *pdev, struct page *page, unsigned long offset, int direction)
{
return ((dma64_addr_t) page_to_phys(page) +
(dma64_addr_t) offset);
}
static inline struct page *
pci_dac_dma_to_page(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
return virt_to_page(__va(dma_addr));
}
static inline unsigned long
pci_dac_dma_to_offset(struct pci_dev *pdev, dma64_addr_t dma_addr)
{
return (dma_addr & ~PAGE_MASK);
}
static inline void
pci_dac_dma_sync_single_for_cpu(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
}
static inline void
pci_dac_dma_sync_single_for_device(struct pci_dev *pdev, dma64_addr_t dma_addr, size_t len, int direction)
{
flush_write_buffers();
}
#ifdef CONFIG_PCI
static inline void pci_dma_burst_advice(struct pci_dev *pdev,
enum pci_dma_burst_strategy *strat,

3
include/asm-xtensa/pci.h
View File

@ -64,9 +64,6 @@ struct pci_dev;
#define pci_ubnmap_len(PTR, LEN_NAME) (0)
#define pci_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0)
/* We cannot access memory above 4GB */
#define pci_dac_dma_supported(pci_dev, mask) (0)
/* Map a range of PCI memory or I/O space for a device into user space */
int pci_mmap_page_range(struct pci_dev *pdev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine);