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8a649045e7
linux/arch/powerpc/kernel
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Chris Smart 8a649045e7 powerpc: Add support for userspace P9 copy paste 
The copy paste facility introduced in POWER9 provides an optimised
mechanism for a userspace application to copy a cacheline. This is
provided by a pair of instructions, copy and paste, while a third,
cp_abort (copy paste abort), provides a clean up of the state in case of
a failure.

The copy instruction will read a 128 byte cacheline and store it in an
internal buffer. The subsequent paste instruction will store this
internal buffer to memory and set a CR field if the paste succeeds.

Since the state of the copy paste buffer is internal (and not
architecturally visible), in the unlikely event of a context switch, the
state cannot be stored and the paste should therefore fail.

The cp_abort instruction exists to fail and clean up any such
interrupted copy paste sequence and is to be called by the kernel as
part of the context switch. Doing so prevents data from a preceding copy
in one process leaking into the paste of another.

This code enables use of the cp_abort instruction if a supported
processor is detected.

NOTE: this is for userspace only, not in kernel, and does not deal
with KVM guests.

Patch created with much assistance from Michael Neuling
<mikey@neuling.org>

Signed-off-by: Chris Smart <chris@distroguy.com>
Reviewed-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-04-27 09:28:07 +10:00
..
vdso32 powerpc: enable UBSAN support 2016-01-20 17:09:18 -08:00
vdso64 powerpc: enable UBSAN support 2016-01-20 17:09:18 -08:00
.gitignore
align.c powerpc: Create disable_kernel_{fp,altivec,vsx,spe}() 2015-12-01 13:52:25 +11:00
asm-offsets.c Merge branch 'topic/livepatch' into next 2016-04-18 20:45:32 +10:00
audit.c
btext.c
cacheinfo.c powerpc: Fix missing L2 cache size in /sys/devices/system/cpu 2015-04-11 20:49:28 +10:00
cacheinfo.h
compat_audit.c
cpu_setup_6xx.S
cpu_setup_44x.S
cpu_setup_fsl_booke.S powerpc/cache: add cache flush operation for various e500 2016-03-04 23:44:51 -06:00
cpu_setup_pa6t.S
cpu_setup_power.S powerpc/mm: Move hash related mmu-*.h headers to book3s/ 2016-03-03 21:19:21 +11:00
cpu_setup_ppc970.S
cputable.c powerpc/cache: add cache flush operation for various e500 2016-03-04 23:44:51 -06:00
crash_dump.c powerpc: Remove superfluous bootmem includes 2014-11-10 09:59:26 +11:00
crash.c powerpc/book3e/kdump: Enable crash_kexec_wait_realmode 2015-10-27 18:13:27 -05:00
dbell.c powerpc/powernv: Fixes for hypervisor doorbell handling 2015-03-20 14:51:53 +11:00
dma-iommu.c powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask 2015-07-13 10:10:55 +10:00
dma-swiotlb.c powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask 2015-07-13 10:10:55 +10:00
dma.c powerpc/dma: dma_set_coherent_mask() should not be GPL only 2015-10-28 14:20:50 +09:00
eeh_cache.c powerpc/eeh: Cache normal BARs, not windows or IOV BARs 2016-03-09 09:58:17 +11:00
eeh_dev.c powerpc/eeh: powerpc/eeh: Support error recovery for VF PE 2016-03-09 09:58:23 +11:00
eeh_driver.c powerpc/eeh: Don't remove passed VFs 2016-03-09 09:58:27 +11:00
eeh_event.c powerpc: sparse: static-ify some things 2016-04-12 21:05:18 +10:00
eeh_pe.c powerpc/eeh: fix misleading indentation 2016-04-27 09:19:37 +10:00
eeh_sysfs.c powerpc/eeh: Fix PE state format 2014-11-27 09:32:58 +11:00
eeh.c powerpc/eeh: rename EEH from "extended" to "enhanced" error handling 2016-04-11 20:30:42 +10:00
entry_32.S powerpc/kernel: Change the do_syscall_trace_enter() API 2015-07-29 11:56:11 +10:00
entry_64.S powerpc: Add support for userspace P9 copy paste 2016-04-27 09:28:07 +10:00
epapr_hcalls.S
epapr_paravirt.c
exceptions-64e.S powerpc/book3e: support CONFIG_RELOCATABLE 2015-10-27 18:13:27 -05:00
exceptions-64s.S powerpc/book3s64: Remove __end_handlers marker 2016-04-21 23:32:58 +10:00
fadump.c powerpc/fadump: rename cpu_online_mask member of struct fadump_crash_info_header 2016-01-20 17:09:18 -08:00
firmware.c
fpu.S powerpc: Add the ability to save FPU without giving it up 2016-03-02 23:34:49 +11:00
fsl_booke_entry_mapping.S powerpc/fsl: Force coherent memory on e500mc derivatives 2015-08-07 23:00:01 -05:00
ftrace.c powerpc/ftrace: Add support for -mprofile-kernel ftrace ABI 2016-03-07 14:53:55 +11:00
head_8xx.S powerpc/8xx: rewrite set_context() in C 2016-03-11 17:20:11 -06:00
head_32.S
head_40x.S
head_44x.S powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
head_64.S powerpc/book3e-64: Use hardcoded mttmr opcode 2016-03-16 15:22:16 +11:00
head_booke.h
head_fsl_booke.S powerpc/cache: add cache flush operation for various e500 2016-03-04 23:44:51 -06:00
hw_breakpoint.c powerpc/hw_breakpoint: Fix oops when destroying hw_breakpoint event 2016-03-03 22:06:08 +11:00
ibmebus.c powerpc: sparse: static-ify some things 2016-04-12 21:05:18 +10:00
idle_6xx.S
idle_book3e.S
idle_e500.S powerpc/e500mc: Remove dead L2 flushing code in idle_e500.S 2015-06-02 21:37:19 -05:00
idle_power4.S
idle_power7.S powerpc/mm: Move hash related mmu-*.h headers to book3s/ 2016-03-03 21:19:21 +11:00
idle.c
io-workarounds.c powerpc/mm: Differentiate between hugetlb and THP during page walk 2015-10-12 15:30:09 +11:00
io.c
iomap.c powerpc/kerenl: Enable EEH for IO accessors 2014-06-24 12:43:13 +10:00
iommu.c powerpc/iommu/powernv: Release replaced TCE 2015-06-11 15:16:49 +10:00
irq.c powerpc/livepatch: Add livepatch stack to struct thread_info 2016-04-14 15:47:06 +10:00
isa-bridge.c
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kgdb.c powerpc: Fix kgdb on little endian ppc64le 2016-02-18 00:03:26 +11:00
kprobes.c powerpc: Replace __get_cpu_var uses 2014-11-03 12:12:32 +11:00
kvm_emul.S
kvm.c powerpc: Remove redundant breaks 2015-08-06 15:10:20 +10:00
l2cr_6xx.S
legacy_serial.c powerpc: make of_device_ids const 2014-09-25 23:14:46 +10:00
machine_kexec_32.c
machine_kexec_64.c powerpc/book3e-64: Enable kexec 2015-10-27 18:13:30 -05:00
machine_kexec.c
Makefile powerpc/ftrace: Use $(CC_FLAGS_FTRACE) when disabling ftrace 2016-03-07 14:53:55 +11:00
mce_power.c powerpc: Add POWER9 cputable entry 2016-02-22 20:47:48 +11:00
mce.c powerpc: sparse: static-ify some things 2016-04-12 21:05:18 +10:00
misc_32.S powerpc: Remove orphaned asm implementation of abs() 2016-04-11 20:30:41 +10:00
misc_64.S powerpc: Simplify module TOC handling 2016-01-21 14:10:56 +11:00
misc.S powerpc: Rename __get_SP() to current_stack_pointer() 2014-10-15 11:23:20 +11:00
module_32.c powerpc/module: Only try to generate the ftrace_caller() stub once 2016-03-07 14:53:53 +11:00
module_64.c Merge branch 'topic/mprofile-kernel' into next 2016-03-11 11:20:15 +11:00
module.c powerpc/module: Only try to generate the ftrace_caller() stub once 2016-03-07 14:53:53 +11:00
msi.c powerpc: Remove MSI-related PCI controller ops from ppc_md 2015-06-02 11:47:45 +10:00
nvram_64.c powerpc: make kernel/nvram_64.c explicitly non-modular 2016-04-11 20:30:43 +10:00
of_platform.c powerpc/eeh: Do probe on pci_dn 2015-03-24 13:15:52 +11:00
paca.c powerpc: Create a helper for getting the kernel toc value 2016-03-07 14:53:52 +11:00
pci_32.c powerpc: Remove more traces of bootmem 2014-11-19 21:41:51 +11:00
pci_64.c powerpc updates for 3.19 2014-12-11 17:48:14 -08:00
pci_dn.c powerpc/eeh: powerpc/eeh: Support error recovery for VF PE 2016-03-09 09:58:23 +11:00
pci_of_scan.c PCI/MSI: Initialize MSI capability for all architectures 2015-11-24 17:45:18 -06:00
pci-common.c powerpc/pci: export pcibios_free_controller() 2015-10-15 20:31:57 +11:00
pci-hotplug.c powerpc/pci: Remove VFs prior to PF 2016-03-09 09:58:15 +11:00
pmc.c
ppc32.h
ppc_ksyms_32.c powerpc32: Remove clear_pages() and define clear_page() inline 2016-03-11 17:20:11 -06:00
ppc_ksyms.c powerpc32: move xxxxx_dcache_range() functions inline 2016-03-11 17:20:12 -06:00
ppc_save_regs.S
proc_powerpc.c
process.c Merge branch 'topic/livepatch' into next 2016-04-18 20:45:32 +10:00
prom_init_check.sh powerpc: Simplify symbol check in prom_init_check.sh 2014-09-25 23:14:46 +10:00
prom_init.c powerpc: Add missing calls to va_end() 2015-12-17 23:23:22 +11:00
prom_parse.c
prom.c powerpc: sparse: Include headers for __weak symbols 2016-04-12 21:05:19 +10:00
ptrace32.c
ptrace.c powerpc: Add rN aliases to the pt_regs_offset table. 2015-11-26 22:11:17 +11:00
reloc_32.S
reloc_64.S
rtas_flash.c powerpc: Fix endianness of flash_block_list in rtas_flash 2014-07-28 11:30:54 +10:00
rtas_pci.c powerpc: move find_and_init_phbs() to pSeries specific code 2015-04-11 20:49:09 +10:00
rtas-proc.c powerpc: LLVM complains about forward declaration of struct rtas_sensors 2014-11-10 09:59:32 +11:00
rtas-rtc.c
rtas.c powerpc/rtas: Make enter_rtas() private 2015-12-17 22:40:56 +11:00
rtasd.c powerpc: sparse: static-ify some things 2016-04-12 21:05:18 +10:00
setup_32.c locking/lockdep: Eliminate lockdep_init() 2016-02-09 12:03:25 +01:00
setup_64.c Merge branch 'topic/livepatch' into next 2016-04-18 20:45:32 +10:00
setup-common.c powerpc: Convert power off logic to pm_power_off 2014-11-03 12:12:51 +11:00
signal_32.c powerpc fixes for 4.4 #2 2015-12-14 20:40:32 +11:00
signal_64.c powerpc fixes for 4.4 #2 2015-12-14 20:40:32 +11:00
signal.c powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
signal.h powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
smp-tbsync.c
smp.c powerpc updates for 4.6 2016-03-19 15:38:41 -07:00
stacktrace.c powerpc: Implement save_stack_trace_regs() to enable kprobe stack tracing 2016-01-11 14:27:28 +11:00
suspend.c nosave: consolidate __nosave_{begin,end} in <asm/sections.h> 2014-10-09 22:26:04 -04:00
swsusp_32.S
swsusp_64.c
swsusp_asm64.S
swsusp_booke.S
swsusp.c powerpc: create flush_all_to_thread() 2015-12-02 19:34:40 +11:00
sys_ppc32.c
syscalls.c powerpc: Add a proper syscall for switching endianness 2015-03-28 22:03:40 +11:00
sysfs.c powerpc/dscr: Add some in-code documentation 2015-06-07 19:29:15 +10:00
systbl_chk.c powerpc: Standardise on NR_syscalls rather than __NR_syscalls. 2015-11-26 22:11:17 +11:00
systbl_chk.sh powerpc: Standardise on NR_syscalls rather than __NR_syscalls. 2015-11-26 22:11:17 +11:00
systbl.S powerpc: Add a proper syscall for switching endianness 2015-03-28 22:03:40 +11:00
tau_6xx.c
time.c powerpc: sparse: Include headers for __weak symbols 2016-04-12 21:05:19 +10:00
tm.S powerpc/kernel: Rename PACA_DSCR to PACA_DSCR_DEFAULT 2015-06-07 19:29:00 +10:00
trace_clock.c powerpc/ftrace: add powerpc timebase as a trace clock source 2015-08-06 16:36:23 +10:00
traps.c powerpc updates for 4.6 2016-03-19 15:38:41 -07:00
udbg_16550.c powerpc: Fix bad NULL pointer check in udbg_uart_getc_poll() 2014-11-12 13:47:20 +11:00
udbg.c powerpc: Remove the celleb support 2015-04-07 17:15:13 +10:00
uprobes.c
vdso.c powerpc: Standardise on NR_syscalls rather than __NR_syscalls. 2015-11-26 22:11:17 +11:00
vecemu.c
vector.S powerpc: Add the ability to save VSX without giving it up 2016-03-02 23:34:50 +11:00
vio.c powerpc: sparse: static-ify some things 2016-04-12 21:05:18 +10:00
vmlinux.lds.S arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections 2016-03-25 16:37:42 -07:00