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dc3106690b
linux/arch/powerpc/kernel
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Cyril Bur dc3106690b powerpc: tm: Always use fp_state and vr_state to store live registers 
There is currently an inconsistency as to how the entire CPU register
state is saved and restored when a thread uses transactional memory
(TM).

Using transactional memory results in the CPU having duplicated
(almost) all of its register state. This duplication results in a set
of registers which can be considered 'live', those being currently
modified by the instructions being executed and another set that is
frozen at a point in time.

On context switch, both sets of state have to be saved and (later)
restored. These two states are often called a variety of different
things. Common terms for the state which only exists after the CPU has
entered a transaction (performed a TBEGIN instruction) in hardware are
'transactional' or 'speculative'.

Between a TBEGIN and a TEND or TABORT (or an event that causes the
hardware to abort), regardless of the use of TSUSPEND the
transactional state can be referred to as the live state.

The second state is often to referred to as the 'checkpointed' state
and is a duplication of the live state when the TBEGIN instruction is
executed. This state is kept in the hardware and will be rolled back
to on transaction failure.

Currently all the registers stored in pt_regs are ALWAYS the live
registers, that is, when a thread has transactional registers their
values are stored in pt_regs and the checkpointed state is in
ckpt_regs. A strange opposite is true for fp_state/vr_state. When a
thread is non transactional fp_state/vr_state holds the live
registers. When a thread has initiated a transaction fp_state/vr_state
holds the checkpointed state and transact_fp/transact_vr become the
structure which holds the live state (at this point it is a
transactional state).

This method creates confusion as to where the live state is, in some
circumstances it requires extra work to determine where to put the
live state and prevents the use of common functions designed (probably
before TM) to save the live state.

With this patch pt_regs, fp_state and vr_state all represent the
same thing and the other structures [pending rename] are for
checkpointed state.

Acked-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-10-04 20:33:15 +11:00
..
vdso32 powerpc/vdso: Fix build rules to rebuild vdsos correctly 2016-08-10 23:04:12 +10:00
vdso64 powerpc/vdso64: Use double word compare on pointers 2016-09-29 15:17:57 +10:00
.gitignore
align.c powerpc: Move cpu_has_feature() to a separate file 2016-08-01 11:15:03 +10:00
asm-offsets.c powerpc/8xx: Force VIRT_IMMR_BASE to be a positive number 2016-07-09 03:26:53 -05:00
audit.c
btext.c powerpc/mm: Use a helper for finding pte bits mapping I/O area 2016-05-01 18:32:32 +10:00
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 powerpc: Various typo fixes 2016-06-14 13:58:26 +10:00
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/irq: Add support for HV virtualization interrupts 2016-07-17 16:42:44 +10:00
cpu_setup_ppc970.S
cputable.c powerpc/book3s: Add a cpu table entry for different POWER9 revs 2016-09-13 17:37:09 +10:00
crash_dump.c
crash.c powerpc/crash: Rearrange loop condition to avoid out of bounds array access 2016-07-14 20:26:22 +10:00
dbell.c powerpc/powernv: Fixes for hypervisor doorbell handling 2015-03-20 14:51:53 +11:00
dma-iommu.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
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 dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
eeh_cache.c powerpc/eeh: Fix pr_debug()s in eeh_cache.c 2016-07-08 22:09:50 +10:00
eeh_dev.c powerpc/pci: Delay populating pdn 2016-06-21 15:30:56 +10:00
eeh_driver.c powerpc/eeh: Skip finding bus until after failure reporting 2016-09-23 07:54:21 +10:00
eeh_event.c powerpc: sparse: static-ify some things 2016-04-12 21:05:18 +10:00
eeh_pe.c powerpc/eeh: Export eeh_pe_state_mark() 2016-09-29 14:51:04 +10:00
eeh_sysfs.c
eeh.c powerpc/eeh: Quieten EEH message when no adapters are found 2016-10-04 16:11:48 +11:00
entry_32.S powerpc/32: Remove CLR_TOP32 2016-09-23 07:54:22 +10:00
entry_64.S powerpc/64s: Optimise MSR handling in exception handling 2016-09-20 15:56:45 +10:00
epapr_hcalls.S
epapr_paravirt.c
exceptions-64e.S powerpc32: provide VIRT_CPU_ACCOUNTING 2016-07-09 01:43:50 -05:00
exceptions-64s.S powerpc/64s: Remove unused exception code, small cleanups 2016-10-04 13:07:16 +11:00
fadump.c powerpc/fadump: Set core e_flags using kernel's ELF ABI version 2016-09-13 17:36:01 +10:00
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: Separate the heuristics for checking call sites 2016-07-21 20:10:37 +10:00
head_8xx.S powerpc/32: Remove CLR_TOP32 2016-09-23 07:54:22 +10:00
head_32.S powerpc/32: Remove CLR_TOP32 2016-09-23 07:54:22 +10:00
head_40x.S
head_44x.S powerpc: Fix misspellings in comments. 2016-03-01 19:27:20 +11:00
head_64.S powerpc: Use gas sections for arranging exception vectors 2016-10-04 13:06:56 +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: Use kprobe blacklist for exception handlers 2016-09-19 10:53:54 +10:00
ibmebus.c powerpc: Remove all usages of NO_IRQ 2016-09-20 20:57:12 +10:00
idle_6xx.S
idle_book3e.S
idle_book3s.S powerpc/powernv: Move IDLE_STATE_ENTER_SEQ macro to cpuidle.h 2016-08-09 14:50:20 +10:00
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.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: add io{read,write}64 accessors 2016-05-31 16:41:52 +08:00
iommu.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
irq.c powerpc: Remove all usages of NO_IRQ 2016-09-20 20:57:12 +10:00
isa-bridge.c powerpc/mm: Use a helper for finding pte bits mapping I/O area 2016-05-01 18:32:32 +10:00
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: migrate exception table users off module.h and onto extable.h 2016-08-22 11:09:33 +10:00
kvm_emul.S
kvm.c powerpc: Remove redundant breaks 2015-08-06 15:10:20 +10:00
l2cr_6xx.S
legacy_serial.c powerpc: Remove all usages of NO_IRQ 2016-09-20 20:57:12 +10:00
machine_kexec_32.c
machine_kexec_64.c powerpc/64/kexec: Remove BookE special default_machine_kexec_prepare() 2016-09-23 07:54:18 +10:00
machine_kexec.c powerpc: Update of_remove_property() call sites to remove null checking 2016-05-11 21:54:04 +10:00
Makefile powerpc/Makefile: Drop CONFIG_WORD_SIZE for BITS 2016-09-13 17:37:06 +10:00
mce_power.c powerpc/mm/radix: Fix CONFIG_PPC_MMU_STD_64 typo 2016-05-11 21:53:59 +10:00
mce.c powerpc/book3s: Fix MCE console messages for unrecoverable MCE. 2016-08-09 19:46:54 +10:00
misc_32.S powerpc/kernel: Use kprobe blacklist for asm functions 2016-09-19 10:53:55 +10:00
misc_64.S powerpc/64/kexec: Copy image with MMU off when possible 2016-09-23 07:54:18 +10:00
misc.S
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 powerpc/modules: Never restore r2 for a mprofile-kernel style mcount() call 2016-07-21 20:10:42 +10:00
module.c powerpc/sparse: Make a bunch of things static 2016-09-13 17:35:47 +10:00
msi.c powerpc: Remove MSI-related PCI controller ops from ppc_md 2015-06-02 11:47:45 +10:00
nvram_64.c powerpc/nvram: Fix an incorrect partition merge 2016-09-20 16:15:42 +10:00
of_platform.c powerpc/eeh: Do probe on pci_dn 2015-03-24 13:15:52 +11:00
paca.c powerpc/mm: Convert early cpu/mmu feature check to use the new helpers 2016-08-01 11:15:01 +10:00
pci_32.c
pci_64.c powerpc fixes for 4.7 #5 2016-07-15 14:57:47 +10:00
pci_dn.c powerpc/pci: Fix build with PCI_IOV=y and EEH=n 2016-07-07 16:33:27 +10:00
pci_of_scan.c powerpc: Remove all usages of NO_IRQ 2016-09-20 20:57:12 +10:00
pci-common.c powerpc: Remove all usages of NO_IRQ 2016-09-20 20:57:12 +10:00
pci-hotplug.c powerpc/pci: Don't scan empty slot 2016-05-11 21:54:26 +10:00
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 powerpc: tm: Always use fp_state and vr_state to store live registers 2016-10-04 20:33:15 +11:00
prom_init_check.sh
prom_init.c powerpc/pasemi: Fix device_type of Nemo SB600 node. 2016-09-13 17:37:08 +10:00
prom_parse.c
prom.c powerpc/mm: Make MMU_FTR_RADIX a MMU family feature 2016-08-01 11:14:57 +10:00
ptrace32.c
ptrace.c powerpc: tm: Always use fp_state and vr_state to store live registers 2016-10-04 20:33:15 +11:00
reloc_32.S
reloc_64.S
rtas_flash.c
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: Various typo fixes 2016-06-14 13:58:26 +10:00
rtas-rtc.c
rtas.c powerpc: Make ppc_md.{halt, restart} __noreturn 2016-07-14 21:12:06 +10:00
rtasd.c powerpc/pseries: start rtasd before PCI probing 2016-07-08 19:22:15 +10:00
setup_32.c powerpc/32: Fix crash during static key init 2016-08-10 19:41:58 +10:00
setup_64.c powerpc/32: Fix crash during static key init 2016-08-10 19:41:58 +10:00
setup-common.c powerpc: Move cpu_has_feature() to a separate file 2016-08-01 11:15:03 +10:00
setup.h powerpc: Merge 32-bit and 64-bit setup_arch() 2016-07-21 19:17:46 +10:00
signal_32.c powerpc: tm: Always use fp_state and vr_state to store live registers 2016-10-04 20:33:15 +11:00
signal_64.c powerpc: tm: Always use fp_state and vr_state to store live registers 2016-10-04 20:33:15 +11:00
signal.c powerpc: signals: Stop using current in signal code 2016-10-04 16:43:07 +11:00
signal.h powerpc: signals: Stop using current in signal code 2016-10-04 16:43:07 +11:00
smp-tbsync.c
smp.c powerpc, hotplug: Avoid to touch non-existent cpumasks. 2016-08-22 11:09:33 +10:00
stacktrace.c powerpc: Implement save_stack_trace_regs() to enable kprobe stack tracing 2016-01-11 14:27:28 +11:00
suspend.c
swsusp_32.S
swsusp_64.c
swsusp_asm64.S
swsusp_booke.S
swsusp.c powerpc/mm: Abstraction for switch_mmu_context() 2016-05-01 18:33:04 +10:00
sys_ppc32.c
syscalls.c powerpc/sparse: Add more assembler prototypes 2016-09-13 17:36:58 +10:00
sysfs.c powerpc/sparse: make some things static 2016-06-16 22:23:11 +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: Add more assembler prototypes 2016-09-13 17:36:58 +10:00
tm.S powerpc: tm: Always use fp_state and vr_state to store live registers 2016-10-04 20:33:15 +11:00
trace_clock.c powerpc/ftrace: add powerpc timebase as a trace clock source 2015-08-06 16:36:23 +10:00
traps.c powerpc: tm: Always use fp_state and vr_state to store live registers 2016-10-04 20:33:15 +11:00
udbg_16550.c
udbg.c powerpc: Remove the celleb support 2015-04-07 17:15:13 +10:00
uprobes.c
vdso.c powerpc/vdso: Add missing include file 2016-08-09 16:52:00 +10:00
vecemu.c
vector.S powerpc: Improve comment explaining why we modify VRSAVE 2016-07-26 14:16:19 +10:00
vio.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
vmlinux.lds.S powerpc: Use gas sections for arranging exception vectors 2016-10-04 13:06:56 +11:00