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alistair23-linux/arch/arm/include/asm
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Marek Szyprowski 4ce63fcd91 ARM: dma-mapping: add support for IOMMU mapper 
This patch add a complete implementation of DMA-mapping API for
devices which have IOMMU support.

This implementation tries to optimize dma address space usage by remapping
all possible physical memory chunks into a single dma address space chunk.

DMA address space is managed on top of the bitmap stored in the
dma_iommu_mapping structure stored in device->archdata. Platform setup
code has to initialize parameters of the dma address space (base address,
size, allocation precision order) with arm_iommu_create_mapping() function.
To reduce the size of the bitmap, all allocations are aligned to the
specified order of base 4 KiB pages.

dma_alloc_* functions allocate physical memory in chunks, each with
alloc_pages() function to avoid failing if the physical memory gets
fragmented. In worst case the allocated buffer is composed of 4 KiB page
chunks.

dma_map_sg() function minimizes the total number of dma address space
chunks by merging of physical memory chunks into one larger dma address
space chunk. If requested chunk (scatter list entry) boundaries
match physical page boundaries, most calls to dma_map_sg() requests will
result in creating only one chunk in dma address space.

dma_map_page() simply creates a mapping for the given page(s) in the dma
address space.

All dma functions also perform required cache operation like their
counterparts from the arm linear physical memory mapping version.

This patch contains code and fixes kindly provided by:
- Krishna Reddy <vdumpa@nvidia.com>,
- Andrzej Pietrasiewicz <andrzej.p@samsung.com>,
- Hiroshi DOYU <hdoyu@nvidia.com>

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-By: Subash Patel <subash.ramaswamy@linaro.org>
2012-05-21 15:06:23 +02:00
..
hardware Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-03-29 16:53:48 -07:00
mach Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci 2012-01-11 18:50:26 -08:00
a.out-core.h
a.out.h
asm-offsets.h
assembler.h ARM: cleanups of io includes 2012-03-29 18:02:10 -07:00
atomic.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
barrier.h ARM: OMAP2+: Fix omap2+ build error 2012-04-03 10:59:10 -07:00
bitops.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
bug.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
bugs.h
byteorder.h
cache.h
cacheflush.h Merge branch 'v6v7' into devel 2011-03-16 23:35:26 +00:00
cachetype.h ARM: 7062/1: cache: detect PIPT I-cache using CTR 2011-10-17 09:13:41 +01:00
checksum.h
clkdev.h ARM: Consolidate the clkdev header files 2011-07-19 18:09:45 +02:00
cmpxchg.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
compiler.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
cp15.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
cpu.h
cpuidle.h cpuidle: Add common time keeping and irq enabling 2012-03-21 01:59:40 -04:00
cputype.h ARM: 7011/1: Add ARM cpu topology definition 2011-10-17 09:02:43 +01:00
cti.h arm: introduce cross trigger interface helpers 2011-12-02 15:16:33 +00:00
current.h
delay.h
device.h ARM: dma-mapping: add support for IOMMU mapper 2012-05-21 15:06:23 +02:00
div64.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
dma-iommu.h ARM: dma-mapping: add support for IOMMU mapper 2012-05-21 15:06:23 +02:00
dma-mapping.h ARM: dma-mapping: use alloc, mmap, free from dma_ops 2012-05-21 15:06:22 +02:00
dma.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
domain.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
ecard.h ARM: io: ecard: move ioaddr() inside __ecard_address 2011-08-17 08:44:16 +01:00
edac.h ARM: 7201/1: add EDAC atomic_scrub function 2011-12-11 08:35:50 +00:00
elf.h ARM: 7294/1: vectors: use gate_vma for vectors user mapping 2012-03-24 09:38:51 +00:00
entry-macro-multi.S ARM: gic: consolidate PPI handling 2011-10-23 13:32:29 +01:00
exception.h ARM: 7115/4: move __exception and friends to asm/exception.h 2011-10-17 09:02:44 +01:00
exec.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
fb.h
fcntl.h
fiq.h ARM: 6940/1: fiq: Briefly document driver responsibilities for suspend/resume 2011-05-26 10:31:06 +01:00
fixmap.h
flat.h
floppy.h
fncpy.h
fpstate.h Fix common misspellings 2011-03-31 11:26:23 -03:00
ftrace.h
futex.h ARM: 7301/1: Rename the T() macro to TUSER() to avoid namespace conflicts 2012-01-25 11:07:40 +00:00
glue-cache.h Fix common misspellings 2011-03-31 11:26:23 -03:00
glue-df.h
glue-pf.h
glue-proc.h Merge branch 'v6v7' into devel 2011-03-16 23:35:26 +00:00
glue.h Fix common misspellings 2011-03-31 11:26:23 -03:00
gpio.h ARM: 7271/1: Fix typo in conversion of ARCH_NR_GPIOS to Kconfig 2012-01-08 09:27:19 +00:00
hardirq.h ARM: 7140/1: remove NR_IRQS dependency for ARM-specific HARDIRQ_BITS definition 2011-12-06 11:14:01 +00:00
highmem.h highmem: kill all __kmap_atomic() 2012-03-20 21:48:30 +08:00
hw_breakpoint.h ARM: hw_breakpoint: add support for multiple watchpoints 2011-08-31 10:42:48 +01:00
hw_irq.h arm: dove: Use proper irq accessor functions 2011-03-29 14:47:57 +02:00
hwcap.h UAPI: Split trivial #if defined(__KERNEL__) && X conditionals 2011-12-13 15:07:49 +00:00
ide.h
idmap.h ARM: SMP: use idmap_pgd for mapping MMU enable during secondary booting 2011-12-06 14:04:15 +00:00
io.h ARM: fix __io macro for PCMCIA 2012-04-05 11:29:55 -07:00
ioctls.h
ipcbuf.h consolidate a bunch of ipcbuf.h instances 2012-01-03 22:55:18 -05:00
irq.h ARM: only include mach/irqs.h for !SPARSE_IRQ 2012-01-30 13:24:37 -06:00
irqflags.h
jump_label.h ARM: 7386/1: jump_label: fixup for rename to static_key 2012-04-15 22:00:31 +01:00
Kbuild ARM: 7006/1: Migrate to asm-generic wrapper support 2011-10-17 09:12:40 +01:00
kexec.h
kgdb.h
kmap_types.h
kprobes.h Kernel: Audit Support For The ARM Platform 2012-01-17 16:17:01 -05:00
leds.h
limits.h
linkage.h
localtimer.h ARM: local timers: make the runtime registration interface mandatory 2012-03-13 13:45:55 +00:00
locks.h
mach-types.h
mc146818rtc.h ARM: mc146818rtc: remove unnecessary include of mach/irqs.h 2012-01-25 20:37:45 -06:00
memblock.h ARM: Add arm_memblock_steal() to allocate memory away from the kernel 2012-01-13 15:02:35 +00:00
memory.h ARM: 7361/1: provide XIP_VIRT_ADDR for no-MMU builds 2012-03-24 09:38:56 +00:00
mman.h
mmu.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
mmu_context.h ARM: 7294/1: vectors: use gate_vma for vectors user mapping 2012-03-24 09:38:51 +00:00
module.h ARM: 7013/1: P2V: Remove ARM_PATCH_PHYS_VIRT_16BIT 2011-08-13 11:26:40 +01:00
msgbuf.h
mtd-xip.h
mutex.h
nwflash.h
opcodes.h ARM: 7311/1: Add generic instruction opcode manipulation helpers 2012-03-24 09:38:51 +00:00
outercache.h ARM: 7114/1: cache-l2x0: add resume entry for l2 in secure mode 2011-10-17 09:11:51 +01:00
page-nommu.h
page.h ARM: 7294/1: vectors: use gate_vma for vectors user mapping 2012-03-24 09:38:51 +00:00
param.h
parport.h
pci.h PCI: collapse pcibios_resource_to_bus 2012-02-23 20:19:04 -07:00
perf_event.h Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-03-29 16:53:48 -07:00
pgalloc.h ARM: LPAE: Page table maintenance for the 3-level format 2011-12-08 10:30:39 +00:00
pgtable-2level-hwdef.h ARM: 7077/1: LPAE: Use a mask for physical addresses in page table entries 2011-10-06 15:40:06 +01:00
pgtable-2level-types.h ARM: 7076/1: LPAE: Add (pte|pmd)val_t type definitions as u32 2011-10-06 15:40:05 +01:00
pgtable-2level.h ARM: LPAE: Move page table maintenance macros to pgtable-2level.h 2011-12-08 10:30:37 +00:00
pgtable-3level-hwdef.h ARM: LPAE: Introduce the 3-level page table format definitions 2011-12-08 10:30:39 +00:00
pgtable-3level-types.h ARM: LPAE: Introduce the 3-level page table format definitions 2011-12-08 10:30:39 +00:00
pgtable-3level.h ARM: LPAE: Page table maintenance for the 3-level format 2011-12-08 10:30:39 +00:00
pgtable-hwdef.h ARM: LPAE: Introduce the 3-level page table format definitions 2011-12-08 10:30:39 +00:00
pgtable-nommu.h Remove remaining bits of io_remap_page_range() 2012-03-23 16:58:31 -07:00
pgtable.h Merge branch 'devel-stable' into for-linus 2012-01-05 13:24:33 +00:00
pmu.h ARM: 7354/1: perf: limit sample_period to half max_period in non-sampling mode 2012-03-07 09:40:48 +00:00
posix_types.h arm: Use generic posix_types.h 2012-02-14 12:01:28 -08:00
proc-fns.h ARM: LPAE: Page table maintenance for the 3-level format 2011-12-08 10:30:39 +00:00
processor.h Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm 2012-03-29 16:53:48 -07:00
procinfo.h
prom.h ARM: get rid of asm/irq.h in asm/prom.h 2012-03-24 09:38:54 +00:00
ptrace.h Kernel: Audit Support For The ARM Platform 2012-01-17 16:17:01 -05:00
scatterlist.h ARM: Allow SoCs to enable scatterlist chaining 2011-06-02 11:16:22 +01:00
sched_clock.h ARM: 7205/2: sched_clock: allow sched_clock to be selected at runtime 2011-12-18 23:00:26 +00:00
seccomp.h
segment.h
sembuf.h
serial.h
setup.h ARM: Allow Kconfig to control the definition of NR_BANKS 2011-12-13 08:52:02 +00:00
shmbuf.h
shmparam.h
sigcontext.h
signal.h
smp.h ARM: 7293/1: logical_cpu_map: decouple CPU mapping from SMP 2012-01-23 10:20:05 +00:00
smp_plat.h ARM: 7293/1: logical_cpu_map: decouple CPU mapping from SMP 2012-01-23 10:20:05 +00:00
smp_scu.h
smp_twd.h ARM: smp_twd: remove old local timer interface 2012-03-13 13:45:54 +00:00
socket.h net: Add framework to allow sending packets with customized CRC. 2012-02-24 01:37:35 -08:00
sockios.h
sparsemem.h
spinlock.h ARM: 6939/1: fix missing 'cpu_relax()' declaration 2011-05-23 17:19:26 +01:00
spinlock_types.h
stackprotector.h
stacktrace.h
stat.h
statfs.h
string.h
suspend.h ARM: pm: preallocate a page table for suspend/resume 2011-09-20 23:33:36 +01:00
swab.h Merge branch 'for-next' of git://git.infradead.org/users/dhowells/linux-headers 2012-01-14 18:03:30 -08:00
switch_to.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
system.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
system_info.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
system_misc.h Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
tcm.h ARM: 6985/1: export functions to determine the presence of I/DTCM 2011-07-06 20:49:45 +01:00
termbits.h
termios.h
therm.h
thread_info.h ARM: 7399/1: vfp: move user vfp state save/restore code out of signal.c 2012-04-23 15:44:41 +01:00
thread_notify.h ARM: 6867/1: Introduce THREAD_NOTIFY_COPY for copy_thread() hooks 2011-04-10 21:13:36 +01:00
timex.h
tlb.h ARM: 7302/1: Add TLB flushing for both entries in a PMD 2012-02-02 17:37:42 +00:00
tlbflush.h ARM: Optimize multi-CPU tlb flushing a little more 2012-03-24 09:38:52 +00:00
tls.h ARM: 7403/1: tls: remove covert channel via TPIDRURW 2012-04-28 11:01:30 +01:00
topology.h ARM: 7182/1: ARM cpu topology: fix warning 2011-11-30 23:55:21 +00:00
traps.h ARM: earlier initialization of vectors page 2012-01-23 10:24:11 +00:00
types.h consolidate umode_t declarations 2012-01-03 22:55:17 -05:00
uaccess.h Disintegrate asm/system.h for ARM 2012-03-28 18:30:01 +01:00
ucontext.h Fix common misspellings 2011-03-31 11:26:23 -03:00
unaligned.h
unified.h ARM: make BSYM macro assembly only 2012-01-16 08:56:25 -06:00
unistd.h UAPI: Split trivial #if defined(__KERNEL__) && X conditionals 2011-12-13 15:07:49 +00:00
unwind.h ARM: 7187/1: fix unwinding for XIP kernels 2011-12-06 11:16:13 +00:00
user.h
vfp.h
vfpmacros.h
vga.h ARM: set vga memory base at run-time 2011-07-12 11:19:29 -05:00
xor.h