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f4ea6dcb08
linux/arch/powerpc/kernel
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Aneesh Kumar K.V f4ea6dcb08 powerpc/mm: Enable mappings above 128TB 
Not all user space application is ready to handle wide addresses. It's
known that at least some JIT compilers use higher bits in pointers to
encode their information. It collides with valid pointers with 512TB
addresses and leads to crashes.

To mitigate this, we are not going to allocate virtual address space
above 128TB by default.

But userspace can ask for allocation from full address space by
specifying hint address (with or without MAP_FIXED) above 128TB.

If hint address set above 128TB, but MAP_FIXED is not specified, we try
to look for unmapped area by specified address. If it's already
occupied, we look for unmapped area in *full* address space, rather than
from 128TB window.

This approach helps to easily make application's memory allocator aware
about large address space without manually tracking allocated virtual
address space.

This is going to be a per mmap decision. ie, we can have some mmaps with
larger addresses and other that do not.

A sample memory layout looks like:

  10000000-10010000 r-xp 00000000 fc:00 9057045          /home/max_addr_512TB
  10010000-10020000 r--p 00000000 fc:00 9057045          /home/max_addr_512TB
  10020000-10030000 rw-p 00010000 fc:00 9057045          /home/max_addr_512TB
  10029630000-10029660000 rw-p 00000000 00:00 0          [heap]
  7fff834a0000-7fff834b0000 rw-p 00000000 00:00 0
  7fff834b0000-7fff83670000 r-xp 00000000 fc:00 9177190  /lib/powerpc64le-linux-gnu/libc-2.23.so
  7fff83670000-7fff83680000 r--p 001b0000 fc:00 9177190  /lib/powerpc64le-linux-gnu/libc-2.23.so
  7fff83680000-7fff83690000 rw-p 001c0000 fc:00 9177190  /lib/powerpc64le-linux-gnu/libc-2.23.so
  7fff83690000-7fff836a0000 rw-p 00000000 00:00 0
  7fff836a0000-7fff836c0000 r-xp 00000000 00:00 0        [vdso]
  7fff836c0000-7fff83700000 r-xp 00000000 fc:00 9177193  /lib/powerpc64le-linux-gnu/ld-2.23.so
  7fff83700000-7fff83710000 r--p 00030000 fc:00 9177193  /lib/powerpc64le-linux-gnu/ld-2.23.so
  7fff83710000-7fff83720000 rw-p 00040000 fc:00 9177193  /lib/powerpc64le-linux-gnu/ld-2.23.so
  7fffdccf0000-7fffdcd20000 rw-p 00000000 00:00 0        [stack]
  1000000000000-1000000010000 rw-p 00000000 00:00 0
  1ffff83710000-1ffff83720000 rw-p 00000000 00:00 0

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-04-01 21:12:29 +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/64: Clean up ppc64_caches using a struct per cache 2017-02-06 19:46:04 +11:00
asm-offsets.c powerpc/mm/hash: Store addr_limit in PACA 2017-04-01 21:12:27 +11:00
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
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
cpu_setup_pa6t.S
cpu_setup_power.S powerpc/mm/hash: Always clear UPRT and Host Radix bits when setting up CPU 2017-02-23 08:26:15 +11:00
cpu_setup_ppc970.S
cputable.c powerpc/64s: POWER9 machine check handler 2017-03-10 16:32:08 +11:00
crash_dump.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
crash.c powerpc/crash: Rearrange loop condition to avoid out of bounds array access 2016-07-14 20:26:22 +10:00
dbell.c
dma-iommu.c dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
dma-swiotlb.c treewide: Constify most dma_map_ops structures 2017-01-24 12:23:35 -05:00
dma.c treewide: Move dma_ops from struct dev_archdata into struct device 2017-01-24 12:23:35 -05:00
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: Fix wrong flag passed to eeh_unfreeze_pe() 2017-01-24 21:22:51 +11:00
eeh_event.c powerpc/pci: Always print PHB and PE numbers as hexadecimal 2016-11-22 11:57:07 +11:00
eeh_pe.c powerpc/pci: Always print PHB and PE numbers as hexadecimal 2016-11-22 11:57:07 +11:00
eeh_sysfs.c
eeh.c powerpc/eeh: Enable IO path on permanent error 2017-01-18 15:11:19 +11:00
entry_32.S powerpc updates for 4.11 part 2 2017-03-01 10:10:16 -08:00
entry_64.S Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-10-14 14:26:58 -07:00
epapr_hcalls.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
epapr_paravirt.c
exceptions-64e.S powerpc/64e: Don't branch to dot symbols 2016-11-28 22:32:30 +11:00
exceptions-64s.S Merge branch 'topic/ppc-kvm' into next 2017-02-14 17:18:29 +11:00
fadump.c powerpc/fadump: Reserve memory at an offset closer to bottom of RAM 2017-03-31 22:34:29 +11:00
firmware.c
fpu.S Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-10-14 14:26:58 -07:00
fsl_booke_entry_mapping.S
ftrace.c powerpc/ftrace: Add prototype for prepare_ftrace_return() 2017-03-20 19:02:49 +11:00
head_8xx.S powerpc/8xx: Perf events on PPC 8xx 2017-01-26 17:49:34 -06:00
head_32.S powerpc/32: Remove Mac-on-Linux/rtlinux hooks 2017-03-21 22:09:26 +11:00
head_40x.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
head_44x.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
head_64.S powerpc/64: Allow for THREAD_SIZE > 16k 2017-03-20 19:02:49 +11:00
head_booke.h
head_fsl_booke.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
hw_breakpoint.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/scottwood/linux into next 2017-02-18 21:37:14 +11:00
idle_6xx.S
idle_book3e.S
idle_book3s.S powerpc/powernv: Fix bug due to labeling ambiguity in power_enter_stop 2017-03-03 11:24:50 +11:00
idle_e500.S
idle_power4.S
idle.c
ima_kexec.c powerpc: ima: send the kexec buffer to the next kernel 2016-12-20 09:48:44 -08:00
io-workarounds.c sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h> 2017-03-02 08:42:37 +01:00
io.c
iomap.c powerpc: Move isa bridge definitions to separate include 2017-01-31 13:54:17 +11:00
iommu.c powerpc: implement the DMA_ATTR_NO_WARN attribute 2016-10-11 15:06:32 -07:00
irq.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
isa-bridge.c powerpc: Add support for non-PCI ISA bridges 2017-01-31 13:54:17 +11:00
jump_label.c
kexec_elf_64.c powerpc: ima: send the kexec buffer to the next kernel 2016-12-20 09:48:44 -08:00
kgdb.c
kprobes.c powerpc/kprobes: Remove kprobe_exceptions_notify() 2017-02-10 14:43:15 +11:00
kvm_emul.S
kvm.c
l2cr_6xx.S
legacy_serial.c powerpc/powernv: Add support for direct mapped LPC on POWER9 2017-01-31 13:54:18 +11:00
machine_kexec_32.c
machine_kexec_64.c powerpc: Add purgatory for kexec_file_load() implementation. 2016-11-30 23:15:26 +11:00
machine_kexec_file_64.c powerpc: ima: send the kexec buffer to the next kernel 2016-12-20 09:48:44 -08:00
machine_kexec.c powerpc: Update of_remove_property() call sites to remove null checking 2016-05-11 21:54:04 +10:00
Makefile powerpc updates for 4.11 part 1. 2017-02-22 10:30:38 -08:00
mce_power.c powerpc/64s: POWER8 add missing machine check definitions 2017-03-21 22:09:31 +11:00
mce.c powerpc/64s: Machine check print NIP 2017-03-21 22:09:28 +11:00
misc_32.S powerpc: Fix build warning on 32-bit PPC 2016-12-25 16:12:20 -08:00
misc_64.S powerpc/64: Fix naming of cache block vs. cache line 2017-02-06 19:46:04 +11:00
misc.S ppc: move exports to definitions 2016-08-07 23:50:09 -04:00
module_32.c
module_64.c modversions: treat symbol CRCs as 32 bit quantities 2017-02-03 08:28:25 -08:00
module.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
msi.c
nvram_64.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
of_platform.c powerpc/of_platform: Use builtin_platform_driver 2016-11-25 14:07:51 +11:00
optprobes_head.S powerpc/optprobes: Fix TOC handling in optprobes trampoline 2017-02-23 08:23:30 +11:00
optprobes.c powerpc/kprobes: Optimize kprobe in kretprobe_trampoline() 2017-02-10 13:28:05 +11:00
paca.c powerpc/mm/hash: Store addr_limit in PACA 2017-04-01 21:12:27 +11:00
pci_32.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
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 updates for 4.11 part 2 2017-03-01 10:10:16 -08:00
pci-hotplug.c powerpc/pci: Don't scan empty slot 2016-05-11 21:54:26 +10:00
pmc.c
ppc32.h
ppc_save_regs.S
proc_powerpc.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
process.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
prom_init_check.sh
prom_init.c powerpc: Update to new option-vector-5 format for CAS 2017-03-06 21:44:09 +11:00
prom_parse.c
prom.c powerpc: Change places using CONFIG_KEXEC to use CONFIG_KEXEC_CORE instead. 2016-11-30 23:15:11 +11:00
ptrace32.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
ptrace.c powerpc/ptrace: Preserve previous TM fprs/vsrs on short regset write 2017-01-20 14:55:19 +11:00
reloc_32.S
reloc_64.S
rtas_flash.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
rtas_pci.c
rtas-proc.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
rtas-rtc.c
rtas.c powerpc/kernel: Fix unbalanced refcount on RTAS device node 2017-01-25 13:34:21 +11:00
rtasd.c powerpc/pseries: Update affinity for memory and cpus specified in a PRRN event 2017-02-02 20:36:38 +11:00
setup_32.c powerpc: Move {d,i,u}cache_bsize definitions to a common place 2017-02-06 19:46:04 +11:00
setup_64.c powerpc/64: Don't use early_cpu_has_feature() in cpu_ready_for_interrupts() 2017-03-28 10:52:05 +11:00
setup-common.c powerpc/mm: Enable mappings above 128TB 2017-04-01 21:12:29 +11:00
setup.h powerpc: Merge 32-bit and 64-bit setup_arch() 2016-07-21 19:17:46 +10:00
signal_32.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
signal_64.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
signal.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
signal.h powerpc: tm: Rename transct_(*) to ck(\1)_state 2016-10-04 20:33:16 +11:00
smp-tbsync.c
smp.c sched/headers: Move task->mm handling methods to <linux/sched/mm.h> 2017-03-03 01:43:28 +01:00
stacktrace.c powerpc: Make /proc/self/stack always print the current stack 2017-03-28 14:43:59 +11:00
suspend.c
swsusp_32.S
swsusp_64.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/nmi.h> 2017-03-02 08:42:30 +01:00
swsusp_asm64.S
swsusp_booke.S
swsusp.c powerpc/swsusp: Include suspend.h to silence sparse warnings 2017-03-20 19:02:49 +11:00
sys_ppc32.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
syscalls.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
sysfs.c powerpc/sysfs: Convert to hotplug state machine 2016-11-22 23:34:42 +01:00
systbl_chk.c
systbl_chk.sh
systbl.S
tau_6xx.c
time.c sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h> 2017-03-02 08:42:39 +01:00
tm.S powerpc: tm: Rename transct_(*) to ck(\1)_state 2016-10-04 20:33:16 +11:00
trace_clock.c
traps.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
udbg_16550.c
udbg.c
uprobes.c
vdso.c powerpc/64: Clean up ppc64_caches using a struct per cache 2017-02-06 19:46:04 +11:00
vecemu.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
vector.S Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2016-10-14 14:26:58 -07:00
vmlinux.lds.S powerpc/64: Fix placement of .text to be immediately following .head.text 2016-12-01 22:26:31 +11:00