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37b3a8ff3e
linux/arch/sparc/kernel
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David S. Miller 37b3a8ff3e sparc64: Move from 4MB to 8MB huge pages. 
The impetus for this is that we would like to move to 64-bit PMDs and
PGDs, but that would result in only supporting a 42-bit address space
with the current page table layout.  It'd be nice to support at least
43-bits.

The reason we'd end up with only 42-bits after making PMDs and PGDs
64-bit is that we only use half-page sized PTE tables in order to make
PMDs line up to 4MB, the hardware huge page size we use.

So what we do here is we make huge pages 8MB, and fabricate them using
4MB hw TLB entries.

Facilitate this by providing a "REAL_HPAGE_SHIFT" which is used in
places that really need to operate on hardware 4MB pages.

Use full pages (512 entries) for PTE tables, and adjust PMD_SHIFT,
PGD_SHIFT, and the build time CPP test as needed.  Use a CPP test to
make sure REAL_HPAGE_SHIFT and the _PAGE_SZHUGE_* we use match up.

This makes the pgtable cache completely unused, so remove the code
managing it and the state used in mm_context_t.  Now we have less
spinlocks taken in the page table allocation path.

The technique we use to fabricate the 8MB pages is to transfer bit 22
from the missing virtual address into the PTEs physical address field.
That takes care of the transparent huge pages case.

For hugetlb, we fill things in at the PTE level and that code already
puts the sub huge page physical bits into the PTEs, based upon the
offset, so there is nothing special we need to do.  It all just works
out.

So, a small amount of complexity in the THP case, but this code is
about to get much simpler when we move the 64-bit PMDs as we can move
away from the fancy 32-bit huge PMD encoding and just put a real PTE
value in there.

With bug fixes and help from Bob Picco.

Signed-off-by: David S. Miller <davem@davemloft.net>
2013-11-12 15:22:34 -08:00
..
.gitignore
apc.c sparc idle: rename pm_idle to sparc_idle 2013-02-17 23:36:56 -05:00
asm-offsets.c [PATCH] sparc32: vm_area_struct access for old Sun SPARCs. 2013-07-10 13:56:10 -07:00
audit.c
auxio_32.c
auxio_64.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
btext.c
central.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
cherrs.S
chmc.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
compat_audit.c
cpu.c sparc64: correctly recognize SPARC64-X chips 2013-03-11 05:06:27 -07:00
cpumap.c support sparc64x chip type in cpumap.c 2013-07-31 19:10:03 -07:00
cpumap.h
devices.c
dma.c
ds.c sparc: fix ldom_reboot buffer overflow harder 2013-10-02 20:01:56 -04:00
dtlb_miss.S
dtlb_prot.S
ebus.c
entry.h sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
entry.S sparc32: Fix exit flag passed from traced sys_sigreturn 2013-07-31 19:10:04 -07:00
etrap_32.S sparc32: introduce support for run-time patching for all shared assembler code 2012-05-27 23:52:49 -07:00
etrap_64.S sparc64: clear syscall_noerror on the entry to syscall, not on the exit 2012-10-14 19:26:52 -04:00
fpu_traps.S
ftrace.c
getsetcc.S
head_32.S sparc32: drop swapper_pg_dir 2012-07-26 16:46:15 -07:00
head_64.S sparc64: correctly recognize SPARC64-X chips 2013-03-11 05:06:27 -07:00
helpers.S
hvapi.c sparc: fix format string argument for prom_printf() 2012-10-02 23:20:34 -04:00
hvcalls.S sparc64: Add hypervisor interfaces for SPARC-T4 perf counter access. 2012-08-18 23:03:53 -07:00
hvtramp.S sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
idprom.c
iommu_common.h
iommu.c
ioport.c procfs: new helper - PDE_DATA(inode) 2013-04-09 14:13:32 -04:00
irq_32.c sparc32: handle leon in irq_32.c 2012-05-27 23:52:44 -07:00
irq_64.c irq: Consolidate do_softirq() arch overriden implementations 2013-10-01 12:53:25 +02:00
irq.h sparc32: remove runtime btfix support 2012-05-14 14:05:09 -07:00
itlb_miss.S
ivec.S
jump_label.c
kernel.h sparc32: refactor smp boot 2013-02-20 13:36:50 -08:00
kgdb_32.c sparc: explicitly include sched.h to get task_thread_info declaration 2013-02-06 11:04:10 -08:00
kgdb_64.c sparc64: cleanup: Rename ret_from_syscall to ret_from_fork 2013-07-31 19:10:04 -07:00
kprobes.c hlist: drop the node parameter from iterators 2013-02-27 19:10:24 -08:00
kstack.h
ktlb.S sparc64: Make PAGE_OFFSET variable. 2013-11-12 15:22:34 -08:00
ldc.c sparc: remove deprecated IRQF_DISABLED 2013-10-02 20:02:35 -04:00
led.c
leon_kernel.c sparc32, leon: Remove separate "ticker" timer for SMP 2013-06-19 02:10:29 -07:00
leon_pci_grpci1.c sparc,leon: Convert to use devm_ioremap_resource 2013-06-19 02:10:30 -07:00
leon_pci_grpci2.c sparc32,leon: add support for PCI busn resource for GRPCI2 2013-03-20 11:06:53 -07:00
leon_pci.c sparc32,leon: add support for PCI busn resource for GRPCI2 2013-03-20 11:06:53 -07:00
leon_pmc.c sparc32, leon: Enable interrupts before going idle to avoid getting stuck 2013-06-19 02:10:29 -07:00
leon_smp.c sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
Makefile sparc: fix MSI build failure on Sparc32 2013-10-02 20:02:35 -04:00
mdesc.c sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
misctrap.S
module.c modules: don't hand 0 to vmalloc. 2012-12-14 13:06:43 +10:30
nmi.c sparc64: Abstract away the %pcr values used to enable/disable NMI 2012-08-18 23:26:19 -07:00
of_device_32.c
of_device_64.c devicetree: add helper inline for retrieving a node's full name 2012-07-06 07:16:34 -05:00
of_device_common.c
of_device_common.h
pci_common.c
pci_fire.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
pci_impl.h drivers/of: Constify device_node->name and ->path_component_name 2012-11-17 12:05:57 +00:00
pci_msi.c
pci_psycho.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
pci_sabre.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
pci_schizo.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
pci_sun4v_asm.S
pci_sun4v.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
pci_sun4v.h
pci.c PCI changes for the v3.11 merge window: 2013-07-03 16:31:35 -07:00
pcic.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
pcr.c sparc64: Add PCR ops for SPARC-T4. 2012-08-18 23:26:19 -07:00
perf_event.c sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 2012-10-26 15:18:37 -07:00
pmc.c sparc idle: rename pm_idle to sparc_idle 2013-02-17 23:36:56 -05:00
power.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
process_32.c dump_stack: unify debug information printed by show_regs() 2013-04-30 17:04:02 -07:00
process_64.c sparc/sysrq: fix inconstistent help message of sysrq key 2013-04-30 17:04:10 -07:00
prom_32.c
prom_64.c of: Make cpu node handling more portable. 2013-10-15 20:09:10 +01:00
prom_common.c of: Fix locking vs. interrupts 2013-06-13 22:12:14 +01:00
prom_irqtrans.c
prom.h
psycho_common.c
psycho_common.h
ptrace_32.c
ptrace_64.c sparc64: Export flush_ptrace_access() (needed by lustre) 2013-09-05 12:12:51 -07:00
reboot.c
rtrap_32.S sparc32: introduce support for run-time patching for all shared assembler code 2012-05-27 23:52:49 -07:00
rtrap_64.S
sbus.c sparc: kernel/sbus.c: fix memory leakage 2013-01-21 14:33:00 -08:00
setup_32.c sparc: kernel: using strlcpy() instead of strcpy() 2013-06-19 02:10:29 -07:00
setup_64.c cpu hw caps support for sparc64x 2013-07-31 19:10:03 -07:00
signal32.c [regression] braino in "sparc: convert to ksignal" 2013-03-02 02:55:16 -05:00
signal_32.c sparc: convert to ksignal 2013-02-14 09:21:16 -05:00
signal_64.c sparc: convert to ksignal 2013-02-14 09:21:16 -05:00
sigutil_32.c
sigutil_64.c
sigutil.h
smp_32.c sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
smp_64.c sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
sparc_ksyms_32.c
sparc_ksyms_64.c
spiterrs.S
sstate.c
stacktrace.c
starfire.c
sun4d_irq.c Include missing linux/slab.h inclusions 2013-04-29 15:42:01 -04:00
sun4d_smp.c sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
sun4m_irq.c sparc32: remove remaining users of btfixup 2012-05-14 14:05:08 -07:00
sun4m_smp.c sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
sun4v_ivec.S
sun4v_tlb_miss.S sparc64: Move from 4MB to 8MB huge pages. 2013-11-12 15:22:34 -08:00
sys32.S unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
sys_sparc32.c kernel-wide: fix missing validations on __get/__put/__copy_to/__copy_from_user() 2013-09-11 15:58:18 -07:00
sys_sparc_32.c sparc: switch to use of generic old sigaction 2013-02-03 22:43:35 -05:00
sys_sparc_64.c sparc64: Clean up 64-bit mmap exclusion defines. 2013-11-12 15:22:33 -08:00
syscalls.S sparc64: Fix not SRA'ed %o5 in 32-bit traced syscall 2013-07-31 19:10:04 -07:00
sysfs.c sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
systbls_32.S sparc: switch to use of generic old sigaction 2013-02-03 22:43:35 -05:00
systbls_64.S unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
systbls.h sparc: switch to generic old sigsuspend 2013-02-03 22:44:37 -05:00
tadpole.c
time_32.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
time_64.c sparc: remove __devinit, __devexit annotations 2013-01-12 15:28:45 -08:00
trampoline_32.S sparc: delete __cpuinit/__CPUINIT usage from all users 2013-07-14 19:36:52 -04:00
trampoline_64.S sparc64: Fix off by one in trampoline TLB mapping installation loop. 2013-08-22 16:38:46 -07:00
traps_32.c taint: add explicit flag to show whether lock dep is still OK. 2013-01-21 17:17:57 +10:30
traps_64.c dump_stack: consolidate dump_stack() implementations and unify their behaviors 2013-04-30 17:04:02 -07:00
tsb.S sparc64: Move from 4MB to 8MB huge pages. 2013-11-12 15:22:34 -08:00
ttable_32.S sparc32: move trap table to a separate file 2012-05-19 23:27:25 -07:00
ttable_64.S sparc64: renamed ttable.S to ttable_64.S 2012-05-19 23:26:41 -07:00
una_asm_32.S
una_asm_64.S
unaligned_32.c
unaligned_64.c sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 2012-10-26 15:18:37 -07:00
utrap.S
vio.c sparc/kernel/vio.c: add put_device() after device_find_child() 2013-05-04 17:38:18 -07:00
viohs.c
visemul.c sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 2012-10-26 15:18:37 -07:00
vmlinux.lds.S sparc64: Make PAGE_OFFSET variable. 2013-11-12 15:22:34 -08:00
windows.c
winfixup.S sparc64: Make montmul/montsqr/mpmul usable in 32-bit threads. 2012-10-26 15:18:37 -07:00
wof.S sparc32: introduce support for run-time patching for all shared assembler code 2012-05-27 23:52:49 -07:00
wuf.S sparc32: introduce support for run-time patching for all shared assembler code 2012-05-27 23:52:49 -07:00