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e7c5650f60
linux/arch/arm/mm
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Catalin Marinas e7c5650f60 ARM: 5996/1: ARM: Change the mandatory barriers implementation (4/4) 
The mandatory barriers (mb, rmb, wmb) are used even on uniprocessor
systems for things like ordering Normal Non-cacheable memory accesses
with DMA transfer (via Device memory writes). The current implementation
uses dmb() for mb() and friends but this is not sufficient. The DMB only
ensures the relative ordering of the observability of accesses by other
processors or devices acting as masters. In case of DMA transfers
started by writes to device memory, the relative ordering is not ensured
because accesses to slave ports of a device are not considered
observable by the DMB definition.

A DSB is required for the data to reach the main memory (even if mapped
as Normal Non-cacheable) before the device receives the notification to
begin the transfer. Furthermore, some L2 cache controllers (like L2x0 or
PL310) buffer stores to Normal Non-cacheable memory and this would need
to be drained with the outer_sync() function call.

The patch also allows platforms to define their own mandatory barriers
implementation by selecting CONFIG_ARCH_HAS_BARRIERS and providing a
mach/barriers.h file.

Note that the SMP barriers are unchanged (being DMBs as before) since
they are only guaranteed to work with Normal Cacheable memory.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-03-25 21:13:50 +00:00
..
abort-ev4.S
abort-ev4t.S
abort-ev5t.S
abort-ev5tj.S
abort-ev6.S Add core support for ARMv6/v7 big-endian 2009-05-30 14:00:18 +01:00
abort-ev7.S
abort-lv4t.S
abort-macro.S
abort-nommu.S
alignment.c Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2010-03-01 09:15:15 -08:00
cache-fa.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
cache-feroceon-l2.c [ARM] Kirkwood: small L2 code cleanup 2009-03-28 22:39:30 -04:00
cache-l2x0.c ARM: 5995/1: ARM: Add L2x0 outer_sync() support (3/4) 2010-03-25 21:13:50 +00:00
cache-tauros2.c ARM: Add Tauros2 L2 cache controller support 2009-11-27 15:43:21 -05:00
cache-v3.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
cache-v4.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
cache-v4wb.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
cache-v4wt.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
cache-v6.S ARM: dma-mapping: fix for speculative prefetching 2010-02-15 15:22:25 +00:00
cache-v7.S ARM: dma-mapping: fix for speculative prefetching 2010-02-15 15:22:25 +00:00
cache-xsc3l2.c [ARM] pxa: do not enable L2 after MMU is enabled 2010-01-01 15:50:34 +08:00
context.c ARM: 5905/1: ARM: Global ASID allocation on SMP 2010-02-15 21:39:51 +00:00
copypage-fa.c ARM: Add support for FA526 v2 2009-03-25 13:10:01 +02:00
copypage-feroceon.c ARM: Flush user mapping on VIVT processors when copying a page 2009-10-05 15:42:16 +01:00
copypage-v3.c ARM: Pass VMA to copy_user_highpage() implementations 2009-10-05 15:17:45 +01:00
copypage-v4mc.c ARM: Pass VMA to copy_user_highpage() implementations 2009-10-05 15:17:45 +01:00
copypage-v4wb.c ARM: Flush user mapping on VIVT processors when copying a page 2009-10-05 15:42:16 +01:00
copypage-v4wt.c ARM: Pass VMA to copy_user_highpage() implementations 2009-10-05 15:17:45 +01:00
copypage-v6.c Merge branches 'at91', 'cache', 'cup', 'ep93xx', 'ixp4xx', 'nuc', 'pending-dma-streaming', 'u300' and 'umc' into devel 2010-02-25 22:06:43 +00:00
copypage-xsc3.c ARM: Flush user mapping on VIVT processors when copying a page 2009-10-05 15:42:16 +01:00
copypage-xscale.c ARM: Pass VMA to copy_user_highpage() implementations 2009-10-05 15:17:45 +01:00
discontig.c
dma-mapping.c Merge branch 'misc2' into devel 2010-02-25 22:09:41 +00:00
extable.c
fault-armv.c ARM: make_coherent(): fix problems with highpte, part 2 2010-02-20 16:42:51 +00:00
fault.c ARM: 5900/2: arm: enable support for software perf events 2010-02-12 17:25:53 +00:00
fault.h
flush.c ARM: Fix ptrace accesses 2009-12-14 14:54:28 +00:00
highmem.c ARM: add size argument to __cpuc_flush_dcache_page 2009-12-14 14:53:22 +00:00
init.c ARM: 5929/1: Add checks to detect overlap of memory regions. 2010-02-15 21:40:33 +00:00
iomap.c
ioremap.c ARM: Add caller information to ioremap 2010-02-15 21:39:11 +00:00
Kconfig ARM: 5996/1: ARM: Change the mandatory barriers implementation (4/4) 2010-03-25 21:13:50 +00:00
Makefile ARM: Ensure ARMv6/7 mm files are built using appropriate assembler options 2010-01-12 19:02:05 +00:00
mm.h ARM: Reduce __flush_dcache_page() visibility 2009-12-04 14:58:50 +00:00
mmap.c fix broken aliasing checks for MAP_FIXED on sparc32, mips, arm and sh 2009-12-11 06:44:59 -05:00
mmu.c Merge branches 'clks' and 'pnx' into devel 2010-02-25 22:10:38 +00:00
nommu.c ARM: Add caller information to ioremap 2010-02-15 21:39:11 +00:00
pabort-legacy.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
pabort-v6.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
pabort-v7.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
pgd.c
proc-arm6_7.S ARM: Fix wrong register in proc-arm6_7.S data abort handler 2010-02-03 15:48:03 +00:00
proc-arm7tdmi.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
proc-arm9tdmi.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
proc-arm720.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
proc-arm740.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
proc-arm920.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm922.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm925.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm926.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm940.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm946.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm1020.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm1020e.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm1022.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-arm1026.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-fa526.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
proc-feroceon.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-macros.S Merge branch 'devel-stable' into devel 2009-09-12 12:02:26 +01:00
proc-mohawk.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
proc-sa110.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
proc-sa1100.S ARM: 5727/1: Pass IFSR register to do_PrefetchAbort() 2009-10-02 22:34:32 +01:00
proc-syms.c ARM: add size argument to __cpuc_flush_dcache_page 2009-12-14 14:53:22 +00:00
proc-v6.S ARM: 5888/1: arm: Update comments in cacheflush.h and remove unnecessary V6 and V7 comments 2010-01-19 23:11:56 +00:00
proc-v7.S ARM: 5888/1: arm: Update comments in cacheflush.h and remove unnecessary V6 and V7 comments 2010-01-19 23:11:56 +00:00
proc-xsc3.S Merge branches 'at91', 'cache', 'cup', 'ep93xx', 'ixp4xx', 'nuc', 'pending-dma-streaming', 'u300' and 'umc' into devel 2010-02-25 22:06:43 +00:00
proc-xscale.S ARM: dma-mapping: remove dmac_clean_range and dmac_inv_range 2010-02-15 15:22:23 +00:00
tlb-fa.S ARM: Add support for FA526 v2 2009-03-25 13:10:01 +02:00
tlb-v3.S
tlb-v4.S
tlb-v4wb.S
tlb-v4wbi.S
tlb-v6.S arm: Use __INIT macro instead of .text.init. 2009-04-27 19:51:58 -07:00
tlb-v7.S ARM: 5858/1: Remove unused vma_vm_flags macro from v7wbi_flush_user_tlb_range 2010-01-05 20:52:06 +00:00
vmregion.c ARM: dma-mapping: split out vmregion code from dma coherent mapping code 2009-11-24 17:41:34 +00:00
vmregion.h ARM: dma-mapping: split out vmregion code from dma coherent mapping code 2009-11-24 17:41:34 +00:00