Stefano Stabellini 340720be32 xen/arm: reimplement xen_dma_unmap_page & friends ... xen_dma_unmap_page, xen_dma_sync_single_for_cpu and xen_dma_sync_single_for_device are currently implemented by calling into the corresponding generic ARM implementation of these functions. In order to do this, firstly the dma_addr_t handle, that on Xen is a machine address, needs to be translated into a physical address. The operation is expensive and inaccurate, given that a single machine address can correspond to multiple physical addresses in one domain, because the same page can be granted multiple times by the frontend. To avoid this problem, we introduce a Xen specific implementation of xen_dma_unmap_page, xen_dma_sync_single_for_cpu and xen_dma_sync_single_for_device, that can operate on machine addresses directly. The new implementation relies on the fact that the hypervisor creates a second p2m mapping of any grant pages at physical address == machine address of the page for dom0. Therefore we can access memory at physical address == dma_addr_r handle and perform the cache flushing there. Some cache maintenance operations require a virtual address. Instead of using ioremap_cache, that is not safe in interrupt context, we allocate a per-cpu PAGE_KERNEL scratch page and we manually update the pte for it. arm64 doesn't need cache maintenance operations on unmap for now. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Tested-by: Denis Schneider <v1ne2go@gmail.com>		2014-09-11 18:11:53 +00:00
..
crypto	ARM: 8119/1: crypto: sha1: add ARM NEON implementation	2014-08-02 08:51:47 +01:00
hardware	ARM: l2c: trial at enabling some Cortex-A9 optimisations	2014-05-30 00:50:41 +01:00
mach	arm: Add devicetree fixup machine function	2014-07-29 21:26:49 -06:00
xen	xen/arm: reimplement xen_dma_unmap_page & friends	2014-09-11 18:11:53 +00:00
arch_timer.h	ARM: arch_timer: add support to configure and enable event stream	2013-09-26 09:47:26 +01:00
asm-offsets.h
assembler.h	ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+	2014-07-18 12:29:04 +01:00
atomic.h	arch,arm: Convert smp_mb__*()	2014-04-18 11:40:32 +02:00
barrier.h	arch,arm: Convert smp_mb__*()	2014-04-18 11:40:32 +02:00
bitops.h	arch,arm: Convert smp_mb__*()	2014-04-18 11:40:32 +02:00
bL_switcher.h	ARM: bL_switcher: Add query interface to discover CPU affinities	2013-09-23 18:47:31 -04:00
bug.h	ARM: Correct BUG() assembly to ensure it is endian-agnostic	2013-10-19 20:46:35 +01:00
bugs.h
cache.h
cacheflush.h	ARM: 8043/1: uprobes need icache flush after xol write	2014-05-25 23:48:45 +01:00
cachetype.h
checksum.h	ARM: fix csum_tcpudp_magic() miscompilation	2013-12-29 12:32:41 +00:00
clkdev.h	clk: Add common __clk_get(), __clk_put() implementations	2013-12-04 17:19:44 +01:00
cmpxchg.h	ARM: 7984/1: prefetch: add prefetchw invocations for barriered atomics	2014-02-25 11:30:20 +00:00
compiler.h	Disintegrate asm/system.h for ARM	2012-03-28 18:30:01 +01:00
cp15.h	ARM: remove global cr_no_alignment	2014-06-02 09:20:18 +01:00
cpu.h	ARM: kernel: add MIDR to per-CPU information data	2012-11-19 14:51:11 +00:00
cpuidle.h	cpuidle: Add common time keeping and irq enabling	2012-03-21 01:59:40 -04:00
cputype.h	ARM: make it easier to check the CPU part number correctly	2014-07-18 12:29:02 +01:00
cti.h	ARM: coresight: common definition for (OS) Lock Access Register key value	2013-01-10 21:13:05 +00:00
dcc.h	ARM: tty: Move HVC DCC assembly to arch/arm	2014-05-28 13:33:18 -07:00
delay.h	ARM: 7685/1: delay: use private ticks_per_jiffy field for timer-based delay ops	2013-04-03 16:45:50 +01:00
device.h	ARM: dma-mapping: Add macro to_dma_iommu_mapping()	2013-02-25 15:30:41 +01:00
div64.h	ARM: 8027/1: fix do_div() bug in big-endian systems	2014-04-22 22:23:57 +01:00
dma-contiguous.h	drivers: dma-contiguous: clean source code and prepare for device tree	2013-08-27 09:18:29 +02:00
dma-iommu.h	arm: dma-iommu: Clean up redundant variable	2014-05-20 13:43:26 +02:00
dma-mapping.h	ARM: dma: implement set_arch_dma_coherent_ops()	2014-05-07 09:21:44 -04:00
dma.h	mm/memblock: add memblock memory allocation apis	2014-01-21 16:19:46 -08:00
domain.h	ARM: fix set_domain() macro	2012-07-05 09:50:55 +01:00
ecard.h
edac.h
elf.h	Move the EM_ARM and EM_AARCH64 definitions to uapi/linux/elf-em.h	2013-09-02 16:35:50 +01:00
entry-macro-multi.S	ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+	2014-07-18 12:29:04 +01:00
exception.h
fb.h
fiq.h
firmware.h	ARM: firmware: add prepare_idle() operation	2014-02-18 13:46:42 -07:00
fixmap.h	ARM: 8031/2: change fixmap mapping region to support 32 CPUs	2014-04-23 11:09:42 +01:00
flat.h	ARM: binfmt_flat: unused variable 'persistent'	2012-10-09 20:29:06 +02:00
floppy.h	ARM: 7996/1: floppy.h: remove deprecated IRQF_DISABLED	2014-03-12 10:32:29 +00:00
fncpy.h
fpstate.h
ftrace.h	arm/ftrace: fix ftrace_return_addr() to ftrace_return_address()	2014-06-18 12:40:55 +01:00
futex.h	ARM: 7984/1: prefetch: add prefetchw invocations for barriered atomics	2014-02-25 11:30:20 +00:00
glue-cache.h	ARM: LLVMLinux: Change "extern inline" to "static inline" in glue-cache.h	2014-06-07 11:44:39 -07:00
glue-df.h	ARM: 8065/1: remove last use of CONFIG_CPU_ARM710	2014-05-30 01:12:30 +01:00
glue-pf.h
glue-proc.h	ARM: 8103/1: save/restore Cortex-A9 CP15 registers on suspend/resume	2014-07-18 12:29:37 +01:00
glue.h
gpio.h	ARM: delete old reference to ARM_GPIOLIB_COMPLEX	2014-06-30 21:37:39 +02:00
hardirq.h	Merge branch 'devel-stable' into for-next	2013-11-12 10:58:59 +00:00
highmem.h	ARM: 8031/2: change fixmap mapping region to support 32 CPUs	2014-04-23 11:09:42 +01:00
hugetlb-3level.h	ARM: mm: HugeTLB support for LPAE systems.	2013-06-04 16:52:37 +01:00
hugetlb.h	ARM: mm: HugeTLB support for LPAE systems.	2013-06-04 16:52:37 +01:00
hw_breakpoint.h	ARM: 7948/1: hw_breakpoint: Add ARMv8 support	2014-02-10 11:48:05 +00:00
hw_irq.h
hwcap.h	ARM: 7981/1: add support for AT_HWCAP2 ELF auxv entry	2014-02-25 11:40:48 +00:00
hypervisor.h	arm: initial Xen support	2012-09-14 13:53:39 +00:00
ide.h
idmap.h	ARM: KVM: move to a KVM provided HYP idmap	2013-04-28 22:23:08 -07:00
io.h	ARM: 8060/1: mm: allow sub-architectures to override PCI I/O memory type	2014-06-01 01:15:04 +01:00
irq.h	arm: Move the set_handle_irq and handle_arch_irq declarations to asm/irq.h	2013-03-26 16:11:20 +00:00
irqflags.h	ARM: Add base support for ARMv7-M	2013-04-17 21:38:10 +02:00
jump_label.h	ARM: 7989/1: Delete asm/system.h	2014-02-25 11:33:37 +00:00
Kbuild	lib/scatterlist: make ARCH_HAS_SG_CHAIN an actual Kconfig	2014-08-08 15:57:26 -07:00
kexec.h
kgdb.h	ARM: kdgb: use <asm/opcodes.h> for data to be assembled as intruction	2013-10-19 20:46:35 +01:00
kmap_types.h	arm: remove km_type definitions	2012-07-24 15:27:28 +08:00
kprobes.h	ARM: Make arch_specific_insn a define for new arch_probes_insn structure	2014-03-18 16:39:40 -04:00
kvm_arm.h	ARM: KVM: trap VM system registers until MMU and caches are ON	2014-03-03 01:15:24 +00:00
kvm_asm.h	ARM: KVM: handle 64bit values passed to mrcc or from mcrr instructions in BE case	2014-07-11 04:57:38 -07:00
kvm_coproc.h	KVM: ARM: User space API for getting/setting co-proc registers	2013-01-23 13:29:14 -05:00
kvm_emulate.h	ARM: KVM: MMIO support BE host running LE code	2014-07-11 04:57:40 -07:00
kvm_host.h	arm64: KVM: split GICv2 world switch from hyp code	2014-07-11 04:57:36 -07:00
kvm_mmio.h	KVM: ARM: Handle I/O aborts	2013-01-23 13:29:17 -05:00
kvm_mmu.h	arm/arm64: KVM: Fix and refactor unmap_range	2014-07-11 04:46:51 -07:00
kvm_psci.h	ARM/ARM64: KVM: Make kvm_psci_call() return convention more flexible	2014-04-30 04:18:57 -07:00
limits.h
linkage.h
mach-types.h
mc146818rtc.h	ARM: mc146818rtc: remove unnecessary include of mach/irqs.h	2012-01-25 20:37:45 -06:00
mcpm.h	ARM: 8081/1: MCPM: provide infrastructure to allow for MCPM loopback	2014-07-18 11:58:00 +01:00
mcs_spinlock.h	ARM: 8098/1: mcs lock: implement wfe-based polling for MCS locking	2014-07-18 12:29:35 +01:00
memblock.h	ARM: 8025/1: Get rid of meminfo	2014-06-01 01:17:12 +01:00
memory.h	Merge branch 'devel-stable' into for-next	2014-08-05 10:27:25 +01:00
mmu.h	ARM: tlb: ASID macro should give 32bit result for BE correct operation	2013-10-19 20:46:36 +01:00
mmu_context.h	ARM: 7790/1: Fix deferred mm switch on VIVT processors	2013-07-26 12:02:09 +01:00
module.h	ARM: 7829/1: Add ".text.unlikely" and ".text.hot" to arm unwind tables	2013-09-02 13:49:47 +01:00
mpu.h	ARM: mpu: protect the vectors page with an MPU region	2013-06-17 15:13:18 +01:00
mtd-xip.h
mutex.h	ARM: 7495/1: mutex: use generic atomic_dec-based implementation for ARMv6+	2012-08-25 09:22:31 +01:00
neon.h	ARM: add support for kernel mode NEON	2013-07-08 22:08:51 +01:00
nwflash.h
opcodes-sec.h	ARM: opcodes: add opcodes definitions for ARM security extensions	2013-01-10 21:10:20 +00:00
opcodes-virt.h	ARM: opcodes: add __ERET/__MSR_ELR_HYP instruction encoding	2012-09-19 08:32:49 +01:00
opcodes.h	ARM: opcodes: add missing include of linux/linkage.h	2013-01-10 21:10:20 +00:00
outercache.h	ARM: l2c: remove old .set_debug method	2014-05-30 00:50:35 +01:00
page-nommu.h
page.h	ARM: make vectors page inaccessible from userspace	2013-08-01 14:31:58 +01:00
pci.h	PCI: Turn pcibios_penalize_isa_irq() into a weak function	2014-05-27 16:23:58 -06:00
percpu.h	ARM: 7747/1: pcpu: ensure __my_cpu_offset cannot be re-ordered across barrier()	2013-06-05 23:35:56 +01:00
perf_event.h	arm: perf: move event map macros to pmu.h	2014-07-02 15:46:37 +01:00
pgalloc.h	arm: handle pgtable_page_ctor() fail	2013-11-15 09:32:16 +09:00
pgtable-2level-hwdef.h
pgtable-2level-types.h
pgtable-2level.h	ARM: 7954/1: mm: remove remaining domain support from ARMv6	2014-02-10 11:48:13 +00:00
pgtable-3level-hwdef.h	ARM: 8109/1: mm: Modify pte_write and pmd_write logic for LPAE	2014-07-24 14:27:08 +01:00
pgtable-3level-types.h
pgtable-3level.h	ARM: 8109/1: mm: Modify pte_write and pmd_write logic for LPAE	2014-07-24 14:27:08 +01:00
pgtable-hwdef.h
pgtable-nommu.h	consolidate io_remap_pfn_range definitions	2013-06-29 12:46:35 +04:00
pgtable.h	ARM: 8108/1: mm: Introduce {pte,pmd}_isset and {pte,pmd}_isclear	2014-07-24 14:27:07 +01:00
pmu.h	arm: perf: add macros for empty event mappings	2014-07-02 15:47:01 +01:00
probes.h	ARM: Make arch_specific_insn a define for new arch_probes_insn structure	2014-03-18 16:39:40 -04:00
proc-fns.h	Merge branch 'for-rmk/lpae' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into devel-stable	2013-06-18 20:11:32 +01:00
processor.h	arch, locking: Ciao arch_mutex_cpu_relax()	2014-07-17 12:32:47 +02:00
procinfo.h
prom.h	of/fdt: move memreserve and dtb memory reservations into core	2014-04-30 00:59:17 -05:00
psci.h	arm: Fix compile warning for psci	2014-05-27 15:58:49 +02:00
ptrace.h	ARM: 8070/1: Introduce arm_get_current_stack_frame()	2014-07-18 12:29:11 +01:00
seccomp.h
setup.h	ARM: 8025/1: Get rid of meminfo	2014-06-01 01:17:12 +01:00
shmparam.h
signal.h	arm: switch to generic old sigaction()	2013-02-03 18:15:47 -05:00
smp.h	ARM: SoC specific changes	2014-04-05 14:19:54 -07:00
smp_plat.h	ARM: 7807/1: kexec: validate CPU hotplug support	2013-08-13 20:23:18 +01:00
smp_scu.h	ARM: make it easier to check the CPU part number correctly	2014-07-18 12:29:02 +01:00
smp_twd.h	ARM: smp_twd: convert to use CLKSRC_OF init	2013-03-11 08:42:08 -05:00
sparsemem.h
spinlock.h	ARM: 7955/1: spinlock: ensure we have a compiler barrier before sev	2014-02-10 11:44:50 +00:00
spinlock_types.h	ARM: locks: prefetch the destination word for write prior to strex	2013-09-30 16:42:55 +01:00
stackprotector.h
stacktrace.h	ARM: 8070/1: Introduce arm_get_current_stack_frame()	2014-07-18 12:29:11 +01:00
string.h
suspend.h	ARM: kernel: implement stack pointer save array through MPIDR hashing	2013-06-20 11:24:11 +01:00
swab.h	UAPI: (Scripted) Disintegrate arch/arm/include/asm	2012-10-12 13:05:52 +01:00
switch_to.h	ARM: spinlock: use inner-shareable dsb variant prior to sev instruction	2013-08-12 12:25:45 +01:00
sync_bitops.h	ARM: 7989/1: Delete asm/system.h	2014-02-25 11:33:37 +00:00
syscall.h	audit: use uapi/linux/audit.h for AUDIT_ARCH declarations	2014-03-20 10:11:59 -04:00
system_info.h	ARM: Add base support for ARMv7-M	2013-04-17 21:38:10 +02:00
system_misc.h	reboot: arm: change reboot_mode to use enum reboot_mode	2013-07-09 10:33:29 -07:00
tcm.h
therm.h
thread_info.h	ARM: 8078/1: get rid of hardcoded assumptions about kernel stack size	2014-07-01 15:05:47 +01:00
thread_notify.h
timex.h	ARM: drop <mach/timex.h> for !ARCH_MULTIPLATFORM, too	2013-12-20 17:17:16 +01:00
tlb.h	mm: split 'tlb_flush_mmu()' into tlb flushing and memory freeing parts	2014-04-25 16:05:40 -07:00
tlbflush.h	ARM: 7855/1: Add check for Cortex-A15 errata 798181 ECO	2013-10-29 11:06:13 +00:00
tls.h	ARM: 7735/2: Preserve the user r/w register TPIDRURW on context switch and fork	2013-06-24 15:21:59 +01:00
topology.h	sched: Remove unused mc_capable() and smt_capable()	2014-03-11 12:05:45 +01:00
traps.h	ARM: earlier initialization of vectors page	2012-01-23 10:24:11 +00:00
trusted_foundations.h	ARM: trusted_foundations: fix compile error on non-SMP	2014-05-23 21:28:11 +02:00
types.h	ARM: 7822/1: add workaround for ambiguous C99 stdint.h types	2013-08-25 17:09:46 +01:00
uaccess.h	Merge branch 'devel-stable' into for-next	2014-08-05 10:27:25 +01:00
ucontext.h
unified.h	ARM: smp_on_up: move inline asm ALT_SMP patching macro out of spinlock.h	2013-09-30 16:42:55 +01:00
unistd.h	ARM: wire up getrandom syscall	2014-08-09 14:07:53 +01:00
unwind.h
uprobes.h	ARM: add uprobes support	2014-03-18 16:39:40 -04:00
user.h
v7m.h	ARM: 7828/1: ARMv7-M: implement restart routine common to all v7-M machines	2013-09-02 13:49:29 +01:00
vfp.h
vfpmacros.h	ARM: 7566/1: vfp: fix save and restore when running on pre-VFPv3 and CONFIG_VFPv3 set	2012-10-29 10:04:05 +00:00
vga.h
virt.h	ARM: 7787/1: virt: ensure visibility of __boot_cpu_mode	2013-07-26 12:01:17 +01:00
word-at-a-time.h	ARM: 7927/1: dcache: select DCACHE_WORD_ACCESS for big-endian CPUs	2013-12-29 12:46:50 +00:00
xor.h	ARM: crypto: add NEON accelerated XOR implementation	2013-07-08 22:09:06 +01:00