firefly-linux-kernel-4.4.55.git
11 years agoMerge branch 'for-next/hugepages' of git://git.linaro.org/people/stevecapper/linux...
Catalin Marinas [Mon, 1 Jul 2013 10:20:58 +0000 (11:20 +0100)]
Merge branch 'for-next/hugepages' of git://git.linaro.org/people/stevecapper/linux into upstream-hugepages

* 'for-next/hugepages' of git://git.linaro.org/people/stevecapper/linux:
  ARM64: mm: THP support.
  ARM64: mm: Raise MAX_ORDER for 64KB pages and THP.
  ARM64: mm: HugeTLB support.
  ARM64: mm: Move PTE_PROT_NONE bit.
  ARM64: mm: Make PAGE_NONE pages read only and no-execute.
  ARM64: mm: Restore memblock limit when map_mem finished.
  mm: thp: Correct the HPAGE_PMD_ORDER check.
  x86: mm: Remove general hugetlb code from x86.
  mm: hugetlb: Copy general hugetlb code from x86 to mm.
  x86: mm: Remove x86 version of huge_pmd_share.
  mm: hugetlb: Copy huge_pmd_share from x86 to mm.

Conflicts:
arch/arm64/Kconfig
arch/arm64/include/asm/pgtable-hwdef.h
arch/arm64/include/asm/pgtable.h

11 years agoarm64: Add initial DTS for APM X-Gene Storm SOC and APM Mustang board
Vinayak Kale [Wed, 24 Apr 2013 09:07:00 +0000 (10:07 +0100)]
arm64: Add initial DTS for APM X-Gene Storm SOC and APM Mustang board

This patch adds initial DTS files required for APM Mustang board.

Signed-off-by: Kumar Sankaran <ksankaran@apm.com>
Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: Add defines for APM ARMv8 implementation
Vinayak Kale [Wed, 24 Apr 2013 09:06:59 +0000 (10:06 +0100)]
arm64: Add defines for APM ARMv8 implementation

This patch adds defines for APM CPU implementer ID and APM CPU part numbers in asm/cputype.h

Signed-off-by: Kumar Sankaran <ksankaran@apm.com>
Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: Enable APM X-Gene SOC family in the defconfig
Vinayak Kale [Wed, 24 Apr 2013 09:06:58 +0000 (10:06 +0100)]
arm64: Enable APM X-Gene SOC family in the defconfig

This patch enables APM X-Gene SOC family in the defconfig. It also enables 8250 serial driver needed by X-Gene SOC family.

Signed-off-by: Kumar Sankaran <ksankaran@apm.com>
Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: Add Kconfig option for APM X-Gene SOC family
Vinayak Kale [Wed, 24 Apr 2013 09:06:57 +0000 (10:06 +0100)]
arm64: Add Kconfig option for APM X-Gene SOC family

This patch adds arm64/Kconfig option for APM X-Gene SOC family.

Signed-off-by: Kumar Sankaran <ksankaran@apm.com>
Signed-off-by: Loc Ho <lho@apm.com>
Signed-off-by: Feng Kan <fkan@apm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64/Makefile: provide vdso_install target
Kyle McMartin [Sun, 16 Jun 2013 19:32:44 +0000 (20:32 +0100)]
arm64/Makefile: provide vdso_install target

Provide a vdso_install target in the arm64 Makefile, as other architectures
with a vdso do.

Signed-off-by: Kyle McMartin <kyle@redhat.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoARM64: mm: THP support.
Steve Capper [Fri, 19 Apr 2013 15:23:57 +0000 (16:23 +0100)]
ARM64: mm: THP support.

Bring Transparent HugePage support to ARM. The size of a
transparent huge page depends on the normal page size. A
transparent huge page is always represented as a pmd.

If PAGE_SIZE is 4KB, THPs are 2MB.
If PAGE_SIZE is 64KB, THPs are 512MB.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoARM64: mm: Raise MAX_ORDER for 64KB pages and THP.
Steve Capper [Thu, 25 Apr 2013 14:19:21 +0000 (15:19 +0100)]
ARM64: mm: Raise MAX_ORDER for 64KB pages and THP.

The buddy allocator has a default MAX_ORDER of 11, which is too
low to allocate enough memory for 512MB Transparent HugePages if
our base page size is 64KB.

This patch introduces MAX_ZONE_ORDER and sets it to 14 when 64KB
pages are used in conjuction with THP, otherwise the default value
of 11 is used.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoARM64: mm: HugeTLB support.
Steve Capper [Wed, 10 Apr 2013 12:48:00 +0000 (13:48 +0100)]
ARM64: mm: HugeTLB support.

Add huge page support to ARM64, different huge page sizes are
supported depending on the size of normal pages:

PAGE_SIZE is 4KB:
   2MB - (pmds) these can be allocated at any time.
1024MB - (puds) usually allocated on bootup with the command line
         with something like: hugepagesz=1G hugepages=6

PAGE_SIZE is 64KB:
 512MB - (pmds) usually allocated on bootup via command line.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoARM64: mm: Move PTE_PROT_NONE bit.
Steve Capper [Tue, 28 May 2013 12:35:51 +0000 (13:35 +0100)]
ARM64: mm: Move PTE_PROT_NONE bit.

Under ARM64, PTEs can be broadly categorised as follows:
   - Present and valid: Bit #0 is set. The PTE is valid and memory
     access to the region may fault.

   - Present and invalid: Bit #0 is clear and bit #1 is set.
     Represents present memory with PROT_NONE protection. The PTE
     is an invalid entry, and the user fault handler will raise a
     SIGSEGV.

   - Not present (file or swap): Bits #0 and #1 are clear.
     Memory represented has been paged out. The PTE is an invalid
     entry, and the fault handler will try and re-populate the
     memory where necessary.

Huge PTEs are block descriptors that have bit #1 clear. If we wish
to represent PROT_NONE huge PTEs we then run into a problem as
there is no way to distinguish between regular and huge PTEs if we
set bit #1.

To resolve this ambiguity this patch moves PTE_PROT_NONE from
bit #1 to bit #2 and moves PTE_FILE from bit #2 to bit #3. The
number of swap/file bits is reduced by 1 as a consequence, leaving
60 bits for file and swap entries.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoARM64: mm: Make PAGE_NONE pages read only and no-execute.
Steve Capper [Thu, 2 May 2013 15:25:42 +0000 (16:25 +0100)]
ARM64: mm: Make PAGE_NONE pages read only and no-execute.

If we consider the following code sequence:

my_pte = pte_modify(entry, myprot);
x = pte_write(my_pte);
y = pte_exec(my_pte);

If myprot comes from a PROT_NONE page, then x and y will both be
true which is undesireable behaviour.

This patch sets the no-execute and read-only bits for PAGE_NONE
such that the code above will return false for both x and y.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoARM64: mm: Restore memblock limit when map_mem finished.
Steve Capper [Tue, 30 Apr 2013 10:00:33 +0000 (11:00 +0100)]
ARM64: mm: Restore memblock limit when map_mem finished.

In paging_init the memblock limit is set to restrict any addresses
returned by early_alloc to fit within the initial direct kernel
mapping in swapper_pg_dir. This allows map_mem to allocate puds,
pmds and ptes from the initial direct kernel mapping.

The limit stays low after paging_init() though, meaning any
bootmem allocations will be from a restricted subset of memory.
Gigabyte huge pages, for instance, are normally allocated from
bootmem as their order (18) is too large for the default buddy
allocator (MAX_ORDER = 11).

This patch restores the memblock limit when map_mem has finished,
allowing gigabyte huge pages (and other objects) to be allocated
from all of bootmem.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agomm: thp: Correct the HPAGE_PMD_ORDER check.
Steve Capper [Tue, 7 May 2013 13:46:03 +0000 (14:46 +0100)]
mm: thp: Correct the HPAGE_PMD_ORDER check.

All Transparent Huge Pages are allocated by the buddy allocator.

A compile time check is in place that fails when the order of a
transparent huge page is too large to be allocated by the buddy
allocator. Unfortunately that compile time check passes when:
HPAGE_PMD_ORDER == MAX_ORDER
( which is incorrect as the buddy allocator can only allocate
memory of order strictly less than MAX_ORDER. )

This patch updates the compile time check to fail in the above
case.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
11 years agox86: mm: Remove general hugetlb code from x86.
Steve Capper [Tue, 30 Apr 2013 07:03:42 +0000 (08:03 +0100)]
x86: mm: Remove general hugetlb code from x86.

huge_pte_alloc, huge_pte_offset and follow_huge_p[mu]d have
already been copied over to mm.

This patch removes the x86 copies of these functions and activates
the general ones by enabling:
CONFIG_ARCH_WANT_GENERAL_HUGETLB

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
11 years agomm: hugetlb: Copy general hugetlb code from x86 to mm.
Steve Capper [Tue, 30 Apr 2013 07:02:03 +0000 (08:02 +0100)]
mm: hugetlb: Copy general hugetlb code from x86 to mm.

The huge_pte_alloc, huge_pte_offset and follow_huge_p[mu]d
functions in x86/mm/hugetlbpage.c do not rely on any architecture
specific knowledge other than the fact that pmds and puds can be
treated as huge ptes.

To allow other architectures to use this code (and reduce the need
for code duplication), this patch copies these functions into mm,
replaces the use of pud_large with pud_huge and provides a config
flag to activate them:
CONFIG_ARCH_WANT_GENERAL_HUGETLB

If CONFIG_ARCH_WANT_HUGE_PMD_SHARE is also active then the
huge_pmd_share code will be called by huge_pte_alloc (othewise we
call pmd_alloc and skip the sharing code).

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
11 years agox86: mm: Remove x86 version of huge_pmd_share.
Steve Capper [Mon, 29 Apr 2013 13:29:48 +0000 (14:29 +0100)]
x86: mm: Remove x86 version of huge_pmd_share.

The huge_pmd_share code has been copied over to mm/hugetlb.c to
make it accessible to other architectures.

Remove the x86 copy of the huge_pmd_share code and enable the
ARCH_WANT_HUGE_PMD_SHARE config flag. That way we reference the
general one.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
11 years agomm: hugetlb: Copy huge_pmd_share from x86 to mm.
Steve Capper [Tue, 23 Apr 2013 11:35:02 +0000 (12:35 +0100)]
mm: hugetlb: Copy huge_pmd_share from x86 to mm.

Under x86, multiple puds can be made to reference the same bank of
huge pmds provided that they represent a full PUD_SIZE of shared
huge memory that is aligned to a PUD_SIZE boundary.

The code to share pmds does not require any architecture specific
knowledge other than the fact that pmds can be indexed, thus can
be beneficial to some other architectures.

This patch copies the huge pmd sharing (and unsharing) logic from
x86/ to mm/ and introduces a new config option to activate it:
CONFIG_ARCH_WANTS_HUGE_PMD_SHARE

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
11 years agoMerge branch 'kvm-arm64/kvm-for-3.11' of git://git.kernel.org/pub/scm/linux/kernel...
Catalin Marinas [Wed, 12 Jun 2013 15:48:38 +0000 (16:48 +0100)]
Merge branch 'kvm-arm64/kvm-for-3.11' of git://git./linux/kernel/git/maz/arm-platforms into upstream

* 'kvm-arm64/kvm-for-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms: (33 commits)
  arm64: KVM: document kernel object mappings in HYP
  arm64: KVM: MAINTAINERS update
  arm64: KVM: userspace API documentation
  arm64: KVM: enable initialization of a 32bit vcpu
  arm64: KVM: 32bit guest fault injection
  arm64: KVM: 32bit specific register world switch
  arm64: KVM: CPU specific 32bit coprocessor access
  arm64: KVM: 32bit handling of coprocessor traps
  arm64: KVM: 32bit conditional execution emulation
  arm64: KVM: 32bit GP register access
  arm64: KVM: define 32bit specific registers
  arm64: KVM: Build system integration
  arm64: KVM: PSCI implementation
  arm64: KVM: Plug the arch timer
  ARM: KVM: timer: allow DT matching for ARMv8 cores
  arm64: KVM: Plug the VGIC
  arm64: KVM: Exit handling
  arm64: KVM: HYP mode world switch implementation
  arm64: KVM: hypervisor initialization code
  arm64: KVM: guest one-reg interface
  ...

Conflicts:
arch/arm64/Makefile

11 years agoarm64: KVM: document kernel object mappings in HYP
Marc Zyngier [Thu, 2 May 2013 13:31:03 +0000 (14:31 +0100)]
arm64: KVM: document kernel object mappings in HYP

HYP mode has access to some of the kernel pages. Document the
memory mapping and the offset between kernel VA and HYP VA.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: MAINTAINERS update
Marc Zyngier [Tue, 2 Apr 2013 16:49:40 +0000 (17:49 +0100)]
arm64: KVM: MAINTAINERS update

Elect myself as the KVM/arm64 maintainer.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: userspace API documentation
Marc Zyngier [Tue, 2 Apr 2013 16:46:31 +0000 (17:46 +0100)]
arm64: KVM: userspace API documentation

Unsurprisingly, the arm64 userspace API is extremely similar to
the 32bit one, the only significant difference being the ONE_REG
register mapping.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: enable initialization of a 32bit vcpu
Marc Zyngier [Thu, 7 Feb 2013 10:46:46 +0000 (10:46 +0000)]
arm64: KVM: enable initialization of a 32bit vcpu

Wire the init of a 32bit vcpu by allowing 32bit modes in pstate,
and providing sensible defaults out of reset state.

This feature is of course conditioned by the presence of 32bit
capability on the physical CPU, and is checked by the KVM_CAP_ARM_EL1_32BIT
capability.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: 32bit guest fault injection
Marc Zyngier [Wed, 6 Feb 2013 11:29:35 +0000 (11:29 +0000)]
arm64: KVM: 32bit guest fault injection

Add fault injection capability for 32bit guests.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: 32bit specific register world switch
Marc Zyngier [Thu, 7 Feb 2013 10:52:10 +0000 (10:52 +0000)]
arm64: KVM: 32bit specific register world switch

Allow registers specific to 32bit guests to be saved/restored
during the world switch.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: CPU specific 32bit coprocessor access
Marc Zyngier [Thu, 7 Feb 2013 10:50:18 +0000 (10:50 +0000)]
arm64: KVM: CPU specific 32bit coprocessor access

Enable handling of CPU specific 32bit coprocessor access. Not much
here either.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: 32bit handling of coprocessor traps
Marc Zyngier [Thu, 7 Feb 2013 10:32:33 +0000 (10:32 +0000)]
arm64: KVM: 32bit handling of coprocessor traps

Provide the necessary infrastructure to trap coprocessor accesses that
occur when running 32bit guests.

Also wire SMC and HVC trapped in 32bit mode while were at it.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: 32bit conditional execution emulation
Marc Zyngier [Wed, 6 Feb 2013 19:54:04 +0000 (19:54 +0000)]
arm64: KVM: 32bit conditional execution emulation

As conditional instructions can trap on AArch32, add the thinest
possible emulation layer to keep 32bit guests happy.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: 32bit GP register access
Marc Zyngier [Wed, 6 Feb 2013 19:40:29 +0000 (19:40 +0000)]
arm64: KVM: 32bit GP register access

Allow access to the 32bit register file through the usual API.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: define 32bit specific registers
Marc Zyngier [Wed, 6 Feb 2013 19:17:50 +0000 (19:17 +0000)]
arm64: KVM: define 32bit specific registers

Define the 32bit specific registers (SPSRs, cp15...).

Most CPU registers are directly mapped to a 64bit register
(r0->x0...). Only the SPSRs have separate registers.

cp15 registers are also mapped into their 64bit counterpart in most
cases.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: Build system integration
Marc Zyngier [Mon, 10 Dec 2012 16:41:44 +0000 (16:41 +0000)]
arm64: KVM: Build system integration

Only the Makefile is plugged in. The Kconfig stuff is in a separate
patch to allow for an easier merge process.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: PSCI implementation
Marc Zyngier [Wed, 12 Dec 2012 18:52:05 +0000 (18:52 +0000)]
arm64: KVM: PSCI implementation

Wire the PSCI backend into the exit handling code.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: Plug the arch timer
Marc Zyngier [Fri, 7 Dec 2012 17:52:03 +0000 (17:52 +0000)]
arm64: KVM: Plug the arch timer

Add support for the in-kernel timer emulation.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoARM: KVM: timer: allow DT matching for ARMv8 cores
Marc Zyngier [Thu, 30 May 2013 17:31:28 +0000 (18:31 +0100)]
ARM: KVM: timer: allow DT matching for ARMv8 cores

ARMv8 cores have the exact same timer as ARMv7 cores. Make sure the
KVM timer code can match it in the device tree.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: Plug the VGIC
Marc Zyngier [Fri, 7 Dec 2012 17:54:54 +0000 (17:54 +0000)]
arm64: KVM: Plug the VGIC

Add support for the in-kernel GIC emulation.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: Exit handling
Marc Zyngier [Mon, 10 Dec 2012 16:40:41 +0000 (16:40 +0000)]
arm64: KVM: Exit handling

Handle the exit of a VM, decoding the exit reason from HYP mode
and calling the corresponding handler.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: HYP mode world switch implementation
Marc Zyngier [Mon, 10 Dec 2012 16:40:18 +0000 (16:40 +0000)]
arm64: KVM: HYP mode world switch implementation

The HYP mode world switch in all its glory.

Implements save/restore of host/guest registers, EL2 trapping,
IPA resolution, and additional services (tlb invalidation).

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoMerge tag 'xen-arm64-3.1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/sstabe...
Catalin Marinas [Wed, 12 Jun 2013 15:11:35 +0000 (16:11 +0100)]
Merge tag 'xen-arm64-3.1-tag' of git://git./linux/kernel/git/sstabellini/xen into upstream

Introduce Xen support to ARM64

* tag 'xen-arm64-3.1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/sstabellini/xen:
  MAINTAINERS: add myself as arm64/xen maintainer
  arm64/xen: introduce CONFIG_XEN and hypercall.S on ARM64
  arm64/xen: use XEN_IO_PROTO_ABI_ARM on ARM64
  arm64/xen: implement ioremap_cached on arm64
  arm64/xen: introduce asm/xen header files on arm64
  arm/xen: define xen_remap as ioremap_cached

11 years agoarm64: debug: consolidate software breakpoint handlers
Will Deacon [Sat, 16 Mar 2013 08:48:13 +0000 (08:48 +0000)]
arm64: debug: consolidate software breakpoint handlers

The software breakpoint handlers are hooked in directly from ptrace,
which makes it difficult to add additional handlers for things like
kprobes and kgdb.

This patch moves the handling code into debug-monitors.c, where we can
dispatch to different debug subsystems more easily.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: extable: sort the exception table at build time
Will Deacon [Wed, 8 May 2013 16:29:24 +0000 (17:29 +0100)]
arm64: extable: sort the exception table at build time

As is done for other architectures, sort the exception table at
build-time rather than during boot.

Since sortextable appears to be a standalone C program relying on the
host elf.h to provide EM_AARCH64, I've had to add a conditional check in
order to allow cross-compilation on machines that aren't running a
bleeding-edge libc-dev.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: device: add iommu pointer to device archdata
Will Deacon [Mon, 10 Jun 2013 18:34:42 +0000 (19:34 +0100)]
arm64: device: add iommu pointer to device archdata

When using an IOMMU for device mappings, it is necessary to keep a
pointer between the device and the IOMMU to which it is attached in
order to obtain the correct IOMMU when attaching the device to a domain.

This patch adds an iommu pointer to the dev_archdata structure, in a
similar manner to other architectures (ARM, PowerPC, x86, ...).

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: pgtable: use pte_index instead of __pte_index
Will Deacon [Mon, 10 Jun 2013 18:34:41 +0000 (19:34 +0100)]
arm64: pgtable: use pte_index instead of __pte_index

pte_index is a useful helper outside of arch/arm64, for things like the
ARM SMMU driver, so rename __pte_index to pte_index to be consistent
with both arch/arm/ and also the definitions of pmd_index and pgd_index.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: kernel: compiling issue, need delete read_current_timer()
Chen Gang [Tue, 21 May 2013 09:46:05 +0000 (10:46 +0100)]
arm64: kernel: compiling issue, need delete read_current_timer()

Under arm64, we will calibrate the delay loop statically using a known
timer frequency, so delete read_current_timer(), or it will cause
compiling issue with allmodconfig.

The related error:
  ERROR: "read_current_timer" [lib/rbtree_test.ko] undefined!
  ERROR: "read_current_timer" [lib/interval_tree_test.ko] undefined!
  ERROR: "read_current_timer" [fs/ext4/ext4.ko] undefined!
  ERROR: "read_current_timer" [crypto/tcrypt.ko] undefined!

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: mm: don't bother invalidating the icache in switch_mm
Will Deacon [Wed, 5 Jun 2013 11:40:34 +0000 (12:40 +0100)]
arm64: mm: don't bother invalidating the icache in switch_mm

We don't support software broadcast of cache maintenance operations, so
this flush is not required (__sync_icache_dcache will always affect all
CPUs).

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: spinlock: retry trylock operation if strex fails on free lock
Catalin Marinas [Fri, 31 May 2013 15:30:58 +0000 (16:30 +0100)]
arm64: spinlock: retry trylock operation if strex fails on free lock

An exclusive store instruction may fail for reasons other than lock
contention (e.g. a cache eviction during the critical section) so, in
line with other architectures using similar exclusive instructions
(alpha, mips, powerpc), retry the trylock operation if the lock appears
to be free but the strex reported failure.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Tony Thompson <anthony.thompson@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
11 years agoarm64: Remove __flush_dcache_page()
Catalin Marinas [Wed, 1 May 2013 15:38:23 +0000 (16:38 +0100)]
arm64: Remove __flush_dcache_page()

This function is only used in __sync_icache_dcache(), so remove it and
call __flush_dcache_area() directly. The flush_icache_user_range()
function is not used in the arm64 kernel.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Will Deacon <will.deacon@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
11 years agoarm64: Do not flush the D-cache for anonymous pages
Catalin Marinas [Wed, 1 May 2013 15:34:22 +0000 (16:34 +0100)]
arm64: Do not flush the D-cache for anonymous pages

The D-cache on AArch64 is VIPT non-aliasing, so there is no need to
flush it for anonymous pages.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Will Deacon <will.deacon@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
11 years agoarm64: Avoid cache flushing in flush_dcache_page()
Catalin Marinas [Wed, 1 May 2013 11:23:05 +0000 (12:23 +0100)]
arm64: Avoid cache flushing in flush_dcache_page()

The flush_dcache_page() function is called when the kernel modified a
page cache page. Since the D-cache on AArch64 does not have aliases
this function can simply mark the page as dirty for later flushing via
set_pte_at()/__sync_icache_dcache() if the page is executable (to ensure
the I-D cache coherency).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Will Deacon <will.deacon@arm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
11 years agoarm64: Provide default implementation for dma_{alloc,free}_attrs
Damian Hobson-Garcia [Tue, 30 Apr 2013 03:02:13 +0000 (04:02 +0100)]
arm64: Provide default implementation for dma_{alloc,free}_attrs

Most architectures that define CONFIG_HAS_DMA, have implementations for
both dma_alloc_attrs() and dma_free_attrs().  All achitectures that do
not define CONFIG_HAS_DMA also have both of these definitions provided
by dma-mapping-broken.h.

Add default implementations for these functions on arm64.

Signed-off-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
11 years agoarm64: KVM: hypervisor initialization code
Marc Zyngier [Mon, 17 Dec 2012 17:07:52 +0000 (17:07 +0000)]
arm64: KVM: hypervisor initialization code

Provide EL2 with page tables and stack, and set the vectors
to point to the full blown world-switch code.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: guest one-reg interface
Marc Zyngier [Mon, 10 Dec 2012 16:37:02 +0000 (16:37 +0000)]
arm64: KVM: guest one-reg interface

Let userspace play with the guest registers.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: MMIO access backend
Marc Zyngier [Mon, 10 Dec 2012 16:29:50 +0000 (16:29 +0000)]
arm64: KVM: MMIO access backend

Define the necessary structures to perform an MMIO access.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: kvm_arch and kvm_vcpu_arch definitions
Marc Zyngier [Mon, 10 Dec 2012 16:29:28 +0000 (16:29 +0000)]
arm64: KVM: kvm_arch and kvm_vcpu_arch definitions

Provide the architecture dependent structures for VM and
vcpu abstractions.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: virtual CPU reset
Marc Zyngier [Mon, 10 Dec 2012 16:23:59 +0000 (16:23 +0000)]
arm64: KVM: virtual CPU reset

Provide the reset code for a virtual CPU booted in 64bit mode.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: CPU specific system registers handling
Marc Zyngier [Wed, 6 Feb 2013 17:30:48 +0000 (17:30 +0000)]
arm64: KVM: CPU specific system registers handling

Add the support code for CPU specific system registers. Not much
here yet.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: system register handling
Marc Zyngier [Mon, 10 Dec 2012 16:15:34 +0000 (16:15 +0000)]
arm64: KVM: system register handling

Provide 64bit system register handling, modeled after the cp15
handling for ARM.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: user space interface
Marc Zyngier [Mon, 10 Dec 2012 16:29:28 +0000 (16:29 +0000)]
arm64: KVM: user space interface

Provide the kvm.h file that defines the user space visible
interface.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: architecture specific MMU backend
Marc Zyngier [Mon, 10 Dec 2012 15:35:24 +0000 (15:35 +0000)]
arm64: KVM: architecture specific MMU backend

Define the arm64 specific MMU backend:
- HYP/kernel VA offset
- S2 4/64kB definitions
- S2 page table populating and flushing
- icache cleaning

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: fault injection into a guest
Marc Zyngier [Mon, 17 Dec 2012 12:27:42 +0000 (12:27 +0000)]
arm64: KVM: fault injection into a guest

Implement the injection of a fault (undefined, data abort or
prefetch abort) into a 64bit guest.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: Basic ESR_EL2 helpers and vcpu register access
Marc Zyngier [Mon, 10 Dec 2012 13:27:52 +0000 (13:27 +0000)]
arm64: KVM: Basic ESR_EL2 helpers and vcpu register access

Implements helpers for dealing with the EL2 syndrome register as
well as accessing the vcpu registers.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: system register definitions for 64bit guests
Marc Zyngier [Mon, 10 Dec 2012 11:16:40 +0000 (11:16 +0000)]
arm64: KVM: system register definitions for 64bit guests

Define the saved/restored registers for 64bit guests.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: EL2 register definitions
Marc Zyngier [Mon, 10 Dec 2012 10:46:47 +0000 (10:46 +0000)]
arm64: KVM: EL2 register definitions

Define all the useful bitfields for EL2 registers.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: HYP mode idmap support
Marc Zyngier [Fri, 7 Dec 2012 18:40:43 +0000 (18:40 +0000)]
arm64: KVM: HYP mode idmap support

Add the necessary infrastructure for identity-mapped HYP page
tables. Idmap-ed code must be in the ".hyp.idmap.text" linker
section.

The rest of the HYP ends up in ".hyp.text".

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoarm64: KVM: define HYP and Stage-2 translation page flags
Marc Zyngier [Fri, 7 Dec 2012 18:35:41 +0000 (18:35 +0000)]
arm64: KVM: define HYP and Stage-2 translation page flags

Add HYP and S2 page flags, for both normal and device memory.

Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
11 years agoMAINTAINERS: add myself as arm64/xen maintainer
Stefano Stabellini [Tue, 4 Jun 2013 16:13:23 +0000 (16:13 +0000)]
MAINTAINERS: add myself as arm64/xen maintainer

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
11 years agoarm64/xen: introduce CONFIG_XEN and hypercall.S on ARM64
Stefano Stabellini [Mon, 3 Jun 2013 17:05:43 +0000 (17:05 +0000)]
arm64/xen: introduce CONFIG_XEN and hypercall.S on ARM64

Introduce CONFIG_XEN and the implementation of hypercall.S (that is
the only ARMv8 specific code in Xen support for ARM).

Compile enlighten.c and grant_table.c from arch/arm.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
11 years agoarm64/xen: use XEN_IO_PROTO_ABI_ARM on ARM64
Stefano Stabellini [Tue, 4 Jun 2013 11:06:30 +0000 (11:06 +0000)]
arm64/xen: use XEN_IO_PROTO_ABI_ARM on ARM64

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
11 years agoarm64/xen: implement ioremap_cached on arm64
Stefano Stabellini [Fri, 31 May 2013 15:22:25 +0000 (15:22 +0000)]
arm64/xen: implement ioremap_cached on arm64

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
11 years agoarm64/xen: introduce asm/xen header files on arm64
Stefano Stabellini [Tue, 4 Jun 2013 11:07:03 +0000 (11:07 +0000)]
arm64/xen: introduce asm/xen header files on arm64

asm/xen/hypercall.h, asm/xen/hypervisor.h, asm/xen/interface.h and
asm/xen/page.h are identical so to avoid code duplication we are just
including the original arm header files here.

asm/xen/events.h is slightly different, so introduce a different file
here (use xchg to implement xchg_xen_ulong and pass regs->pstate to
raw_irqs_disabled_flags).

Also introduce asm/hypervisor.h and asm/sync_bitops.h.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
11 years agoarm/xen: define xen_remap as ioremap_cached
Stefano Stabellini [Tue, 4 Jun 2013 16:32:15 +0000 (16:32 +0000)]
arm/xen: define xen_remap as ioremap_cached

Define xen_remap as ioremap_cache (MT_MEMORY and MT_DEVICE_CACHED end up
having the same AttrIndx encoding).

Remove include asm/mach/map.h, not unneeded.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
11 years agoLinux 3.10-rc4
Linus Torvalds [Sun, 2 Jun 2013 08:11:17 +0000 (17:11 +0900)]
Linux 3.10-rc4

11 years agoMerge branch 'for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/paris...
Linus Torvalds [Sat, 1 Jun 2013 21:24:54 +0000 (06:24 +0900)]
Merge branch 'for-3.10' of git://git./linux/kernel/git/deller/parisc-linux

Pull parisc fixes from Helge Deller:
 "This patcheset includes fixes for:

   - the PCI/LBA which brings back the stifb graphics framebuffer
     console
   - possible memory overflows in parisc kernel init code
   - parport support on older GSC machines
   - avoids that users by mistake enable PARPORT_PC_SUPERIO on parisc
   - MAINTAINERS file list updates for parisc."

* 'for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
  parisc: parport0: fix this legacy no-device port driver!
  parport_pc: disable PARPORT_PC_SUPERIO on parisc architecture
  parisc/PCI: lba: fix: convert to pci_create_root_bus() for correct root bus resources (v2)
  parisc/PCI: Set type for LBA bus_num resource
  MAINTAINERS: update parisc architecture file list
  parisc: kernel: using strlcpy() instead of strcpy()
  parisc: rename "CONFIG_PA7100" to "CONFIG_PA7000"
  parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50
  parisc: memory overflow, 'name' length is too short for using

11 years agoparisc: parport0: fix this legacy no-device port driver!
Helge Deller [Thu, 30 May 2013 21:06:39 +0000 (21:06 +0000)]
parisc: parport0: fix this legacy no-device port driver!

Fix the above kernel error from parport_announce_port() on 32bit GSC
machines (e.g. B160L). The parport driver requires now a pointer to the
device struct.

Signed-off-by: Helge Deller <deller@gmx.de>
11 years agoparport_pc: disable PARPORT_PC_SUPERIO on parisc architecture
Helge Deller [Thu, 30 May 2013 16:24:46 +0000 (16:24 +0000)]
parport_pc: disable PARPORT_PC_SUPERIO on parisc architecture

If enabled, CONFIG_PARPORT_PC_SUPERIO scans on PC-like hardware for
various super-io chips by accessing i/o ports in a range which will
crash any parisc hardware at once.

In addition, parisc has it's own incompatible superio chip
(CONFIG_SUPERIO), so if we disable PARPORT_PC_SUPERIO completely for
parisc we can avoid that people by accident enable the parport_pc
superio option too.

Signed-off-by: Helge Deller <deller@gmx.de>
11 years agoparisc/PCI: lba: fix: convert to pci_create_root_bus() for correct root bus resources...
Helge Deller [Fri, 31 May 2013 22:24:58 +0000 (22:24 +0000)]
parisc/PCI: lba: fix: convert to pci_create_root_bus() for correct root bus resources (v2)

commit dc7dce280a
Author: Bjorn Helgaas <bhelgaas@google.com>
Date:   Fri Oct 28 16:27:27 2011 -0600
   parisc/PCI: lba: convert to pci_create_root_bus() for correct root bus
                    resources

  Supply root bus resources to pci_create_root_bus() so they're correct
  immediately.  This fixes the problem of "early" and "header" quirks seeing
  incorrect root bus resources.

added tests for elmmio_space.start while it should use
elmmio_space.flags.  This for example led to incorrect resource
assignments and a non-working stifb framebuffer on most parisc machines.

LBA 10:1: PCI host bridge to bus 0000:01
pci_bus 0000:01: root bus resource [io  0x12000-0x13fff] (bus address [0x2000-0x3fff])
pci_bus 0000:01: root bus resource [mem 0xfffffffffa000000-0xfffffffffbffffff] (bus address [0xfa000000-0xfbffffff])
pci_bus 0000:01: root bus resource [mem 0xfffffffff4800000-0xfffffffff4ffffff] (bus address [0xf4800000-0xf4ffffff])
pci_bus 0000:01: root bus resource [??? 0x00000001 flags 0x0]

Signed-off-by: Helge Deller <deller@gmx.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
11 years agoparisc/PCI: Set type for LBA bus_num resource
Bjorn Helgaas [Thu, 30 May 2013 17:45:39 +0000 (11:45 -0600)]
parisc/PCI: Set type for LBA bus_num resource

The non-PAT resource probing code failed to set the type of the LBA bus_num
resource (30aa80da43 "parisc/PCI: register busn_res for root buses" did
the corresponding thing for the PAT case).

This causes incorrect resource assignments and a non-working stifb
framebuffer on most parisc machines.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Helge Deller <deller@gmx.de>
11 years agoMAINTAINERS: update parisc architecture file list
Helge Deller [Thu, 30 May 2013 13:48:07 +0000 (13:48 +0000)]
MAINTAINERS: update parisc architecture file list

Signed-off-by: Helge Deller <deller@gmx.de>
11 years agoparisc: kernel: using strlcpy() instead of strcpy()
Chen Gang [Thu, 30 May 2013 01:18:43 +0000 (01:18 +0000)]
parisc: kernel: using strlcpy() instead of strcpy()

'boot_args' is an input args, and 'boot_command_line' has a fix length.
So use strlcpy() instead of strcpy() to avoid memory overflow.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Acked-by: Kyle McMartin <kyle@mcmartin.ca>
Signed-off-by: Helge Deller <deller@gmx.de>
11 years agoparisc: rename "CONFIG_PA7100" to "CONFIG_PA7000"
Paul Bolle [Wed, 29 May 2013 09:56:58 +0000 (09:56 +0000)]
parisc: rename "CONFIG_PA7100" to "CONFIG_PA7000"

There's a Makefile line setting cflags for CONFIG_PA7100. But that
Kconfig macro doesn't exist. There is a Kconfig symbol PA7000, which
covers both PA7000 and PA7100 processors. So let's use the corresponding
Kconfig macro.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Helge Deller <deller@gmx.de>
11 years agoparisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50
Helge Deller [Tue, 28 May 2013 20:35:54 +0000 (20:35 +0000)]
parisc: fix kernel BUG at arch/parisc/include/asm/mmzone.h:50

With CONFIG_DISCONTIGMEM=y and multiple physical memory areas,
cat /proc/kpageflags triggers this kernel bug:

kernel BUG at arch/parisc/include/asm/mmzone.h:50!
CPU: 2 PID: 7848 Comm: cat Tainted: G      D W 3.10.0-rc3-64bit #44
 IAOQ[0]: kpageflags_read0x128/0x238
 IAOQ[1]: kpageflags_read0x12c/0x238
 RP(r2): proc_reg_read0xbc/0x130
Backtrace:
 [<00000000402ca2d4>] proc_reg_read0xbc/0x130
 [<0000000040235bcc>] vfs_read0xc4/0x1d0
 [<0000000040235f0c>] SyS_read0x94/0xf0
 [<0000000040105fc0>] syscall_exit0x0/0x14

kpageflags_read() walks through the whole memory, even if some memory
areas are physically not available. So, we should better not BUG on an
unavailable pfn in pfn_to_nid() but just return the expected value -1 or
0.

Signed-off-by: Helge Deller <deller@gmx.de>
11 years agoparisc: memory overflow, 'name' length is too short for using
Chen Gang [Mon, 27 May 2013 04:57:09 +0000 (04:57 +0000)]
parisc: memory overflow, 'name' length is too short for using

'path.bc[i]' can be asigned by PCI_SLOT() which can '> 10', so sizeof(6
* "%u:" + "%u" + '\0') may be 21.

Since 'name' length is 20, it may be memory overflow.

And 'path.bc[i]' is 'unsigned char' for printing, we can be sure the
max length of 'name' must be less than 28.

So simplify thinking, we can use 28 instead of 20 directly, and do not
think of whether 'patchc.bc[i]' can '> 100'.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Helge Deller <deller@gmx.de>
11 years agoMerge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
Linus Torvalds [Sat, 1 Jun 2013 11:13:16 +0000 (20:13 +0900)]
Merge branch 'merge' of git://git./linux/kernel/git/benh/powerpc

Pull powerpc fixes from Ben Herrenschmidt:
 "Here are a few more fixes for powerpc 3.10.  It's a bit more than I
  would have liked this late in the game but I suppose that's what
  happens with a brand new chip generation coming out.

  A few regression fixes, some last minute fixes for new P8 features
  such as transactional memory,...

  There's also one powerpc KVM patch that I requested that adds two
  missing functions to our in-kernel interrupt controller support which
  is itself a new 3.10 feature.  These are defined by the base
  hypervisor specification.  We didn't implement them originally because
  Linux doesn't use them but they are simple and I'm not comfortable
  having a half-implemented interface in 3.10 and having to deal with
  versionning etc...  later when something starts needing those calls.
  They cannot be emulated in qemu when using in-kernel interrupt
  controller (not enough shared state).

  Just added a last minute patch to fix a typo introducing a breakage in
  our cputable for Power7+ processors, sorry about that, but the
  regression it fixes just hurt me :-)"

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/cputable: Fix typo on P7+ cputable entry
  powerpc/perf: Add missing SIER support
  powerpc/perf: Revert to original NO_SIPR logic
  powerpc/pci: Remove the unused variables in pci_process_bridge_OF_ranges
  powerpc/pci: Remove the stale comments of pci_process_bridge_OF_ranges
  powerpc/pseries: Always enable CONFIG_HOTPLUG_CPU on PSERIES SMP
  powerpc/kvm/book3s: Add support for H_IPOLL and H_XIRR_X in XICS emulation
  powerpc/32bit:Store temporary result in r0 instead of r8
  powerpc/mm: Always invalidate tlb on hpte invalidate and update
  powerpc/pseries: Improve stream generation comments in copypage/user
  powerpc/pseries: Kill all prefetch streams on context switch
  powerpc/cputable: Fix oprofile_cpu_type on power8
  powerpc/mpic: Fix irq distribution problem when MPIC_SINGLE_DEST_CPU
  powerpc/tm: Fix userspace stack corruption on signal delivery for active transactions
  powerpc/tm: Move TM abort cause codes to uapi
  powerpc/tm: Abort on emulation and alignment faults
  powerpc/tm: Update cause codes documentation
  powerpc/tm: Make room for hypervisor in abort cause codes

11 years agoMerge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Linus Torvalds [Sat, 1 Jun 2013 11:05:20 +0000 (20:05 +0900)]
Merge git://git./linux/kernel/git/nab/target-pending

Pull scsi target fixes from Nicholas Bellinger:
 "The highlights include:

   - Re-instate sess->wait_list in target_wait_for_sess_cmds() for
     active I/O shutdown handling in fabrics using se_cmd->cmd_kref
   - Make ib_srpt call target_sess_cmd_list_set_waiting() during session
     shutdown
   - Fix FILEIO off-by-one READ_CAPACITY bug for !S_ISBLK export
   - Fix iscsi-target login error heap buffer overflow (Kees)
   - Fix iscsi-target active I/O shutdown handling regression in
     v3.10-rc1

  A big thanks to Kees Cook for fixing a long standing login error
  buffer overflow bug.

  All patches are CC'ed to stable with the exception of the v3.10-rc1
  specific regression + other minor target cleanup."

* git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  iscsi-target: Fix iscsit_free_cmd() se_cmd->cmd_kref shutdown handling
  target: Propigate up ->cmd_kref put return via transport_generic_free_cmd
  iscsi-target: fix heap buffer overflow on error
  target/file: Fix off-by-one READ_CAPACITY bug for !S_ISBLK export
  ib_srpt: Call target_sess_cmd_list_set_waiting during shutdown_session
  target: Re-instate sess_wait_list for target_wait_for_sess_cmds
  target: Remove unused wait_for_tasks bit in target_wait_for_sess_cmds

11 years agoMerge tag 'clk-fixes-for-linus' of git://git.linaro.org/people/mturquette/linux
Linus Torvalds [Sat, 1 Jun 2013 10:55:26 +0000 (19:55 +0900)]
Merge tag 'clk-fixes-for-linus' of git://git.linaro.org/people/mturquette/linux

Pull clock subsystem fixes from Mike Turquette:
 "A mix of small fixes affecting mostly ARM platforms as well as a
  discrete clock expander chip.  Most fixes are corrections to lousy
  clock data of one form or another."

* tag 'clk-fixes-for-linus' of git://git.linaro.org/people/mturquette/linux:
  clk: mxs: Include clk mxs header file
  clk: vt8500: Fix unbalanced spinlock in vt8500_dclk_set_rate()
  clk: si5351: Set initial clkout rate when defined in platform data.
  clk: si5351: Fix clkout rate computation.
  clk: samsung: Add CLK_IGNORE_UNUSED flag for the sysreg clocks
  clk: ux500: clk-sysctrl: handle clocks with no parents
  clk: ux500: Provide device enumeration number suffix for SMSC911x

11 years agoMerge tag 'fbdev-for-3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/plagn...
Linus Torvalds [Sat, 1 Jun 2013 10:53:41 +0000 (19:53 +0900)]
Merge tag 'fbdev-for-3.10-rc4' of git://git./linux/kernel/git/plagnioj/linux-fbdev

Pull fbdev fixes from Jean-Christophe PLAGNIOL-VILLARD:
 "This contains some small fixes

   - Atmel LCDC: fix blank the backlight on remove
   - ps3fb: fix compile warning
   - OMAPDSS: Fix crash with DT boot"

* tag 'fbdev-for-3.10-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/plagnioj/linux-fbdev:
  atmel_lcdfb: blank the backlight on remove
  trivial: atmel_lcdfb: add missing error message
  OMAPDSS: Fix crash with DT boot
  fbdev/ps3fb: fix compile warning

11 years agoMerge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Linus Torvalds [Sat, 1 Jun 2013 10:51:52 +0000 (19:51 +0900)]
Merge branch 'for-linus' of git://git./linux/kernel/git/viro/vfs

Pull assorted fixes from Al Viro:
 "There'll be more - I'm trying to dig out from under the pile of mail
  (a couple of weeks of something flu-like ;-/) and there's several more
  things waiting for review; this is just the obvious stuff."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  zoran: racy refcount handling in vm_ops ->open()/->close()
  befs_readdir(): do not increment ->f_pos if filldir tells us to stop
  hpfs: deadlock and race in directory lseek()
  qnx6: qnx6_readdir() has a braino in pos calculation
  fix buffer leak after "scsi: saner replacements for ->proc_info()"
  vfs: Fix invalid ida_remove() call

11 years agoMerge tag 'nfs-for-3.10-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Linus Torvalds [Sat, 1 Jun 2013 10:48:59 +0000 (19:48 +0900)]
Merge tag 'nfs-for-3.10-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull two NFS client fixes from Trond Myklebust:
 - Fix a regression that broke NFS mounting using klibc and busybox
 - Stable fix to check access modes correctly on NFSv4 delegated open()

* tag 'nfs-for-3.10-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
  NFS: Fix security flavor negotiation with legacy binary mounts
  NFSv4: Fix a thinko in nfs4_try_open_cached

11 years agopowerpc/cputable: Fix typo on P7+ cputable entry
Will Schmidt [Mon, 20 May 2013 05:04:18 +0000 (05:04 +0000)]
powerpc/cputable: Fix typo on P7+ cputable entry

Fix a typo in setting COMMON_USER2_POWER7 bits to .cpu_user_features2
cpu specs table.

Signed-off-by: Will Schmidt <will_schmidt@vnet.ibm.com>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/perf: Add missing SIER support
Michael Ellerman [Wed, 15 May 2013 20:19:31 +0000 (20:19 +0000)]
powerpc/perf: Add missing SIER support

Commit 8f61aa3 "Add support for SIER" missed updates to siar_valid()
and perf_get_data_addr().

In both cases we need to check the SIER instead of mmcra.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/perf: Revert to original NO_SIPR logic
Michael Ellerman [Wed, 15 May 2013 20:19:30 +0000 (20:19 +0000)]
powerpc/perf: Revert to original NO_SIPR logic

This is a revert and then some of commit 860aad7 "Add regs_no_sipr()".
This workaround was only needed on early chip versions.

As before NO_SIPR becomes a static flag of the PMU struct.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/pci: Remove the unused variables in pci_process_bridge_OF_ranges
Kevin Hao [Thu, 16 May 2013 20:58:42 +0000 (20:58 +0000)]
powerpc/pci: Remove the unused variables in pci_process_bridge_OF_ranges

The codes which ever used these two variables have gone. Throw away
them too.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/pci: Remove the stale comments of pci_process_bridge_OF_ranges
Kevin Hao [Thu, 16 May 2013 20:58:41 +0000 (20:58 +0000)]
powerpc/pci: Remove the stale comments of pci_process_bridge_OF_ranges

These comments already don't apply to the current code. So just remove
them.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/pseries: Always enable CONFIG_HOTPLUG_CPU on PSERIES SMP
Srivatsa S. Bhat [Tue, 21 May 2013 09:32:48 +0000 (09:32 +0000)]
powerpc/pseries: Always enable CONFIG_HOTPLUG_CPU on PSERIES SMP

Adam Lackorzynski reported the following build failure on
!CONFIG_HOTPLUG_CPU configuration:

  CC      arch/powerpc/kernel/rtas.o
arch/powerpc/kernel/rtas.c: In function ‘rtas_cpu_state_change_mask’:
arch/powerpc/kernel/rtas.c:843:4: error: implicit declaration of function ‘cpu_down’ [-Werror=implicit-function-declaration]
cc1: all warnings being treated as errors
make[1]: *** [arch/powerpc/kernel/rtas.o] Error 1
make: *** [arch/powerpc/kernel] Error 2

The build fails because cpu_down() is defined only under CONFIG_HOTPLUG_CPU.

Looking further, the mobility code in pseries is one of the call-sites which
uses rtas_ibm_suspend_me(), which in turn calls rtas_cpu_state_change_mask().
And the mobility code is unconditionally compiled-in (it does not fall under
any Kconfig option). And commit 120496ac (powerpc: Bring all threads online
prior to migration/hibernation) which introduced this build regression is
critical for the proper functioning of the migration code. So it appears
that the only solution to this problem is to enable CONFIG_HOTPLUG_CPU if
SMP is enabled on PPC_PSERIES platforms. So make that change in the Kconfig.

Reported-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
Cc: stable@vger.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/kvm/book3s: Add support for H_IPOLL and H_XIRR_X in XICS emulation
Paul Mackerras [Thu, 23 May 2013 15:42:21 +0000 (15:42 +0000)]
powerpc/kvm/book3s: Add support for H_IPOLL and H_XIRR_X in XICS emulation

This adds the remaining two hypercalls defined by PAPR for manipulating
the XICS interrupt controller, H_IPOLL and H_XIRR_X.  H_IPOLL returns
information about the priority and pending interrupts for a virtual
cpu, without changing any state.  H_XIRR_X is like H_XIRR in that it
reads and acknowledges the highest-priority pending interrupt, but it
also returns the timestamp (timebase register value) from when the
interrupt was first received by the hypervisor.  Currently we just
return the current time, since we don't do any software queueing of
virtual interrupts inside the XICS emulation code.

These hcalls are not currently used by Linux guests, but may be in
future.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/32bit:Store temporary result in r0 instead of r8
Priyanka Jain [Fri, 31 May 2013 01:20:02 +0000 (01:20 +0000)]
powerpc/32bit:Store temporary result in r0 instead of r8

Commit a9c4e541ea9b22944da356f2a9258b4eddcc953b
"powerpc/kprobe: Complete kprobe and migrate exception frame"
introduced a regression:

While returning from exception handling in case of PREEMPT enabled,
_TIF_NEED_RESCHED bit is checked in TI_FLAGS (thread_info flag) of current
task. Only if this bit is set, it should continue with the process of
calling preempt_schedule_irq() to schedule highest priority task if
available.

Current code assumes that r8 contains TI_FLAGS and check this for
_TIF_NEED_RESCHED, but as r8 is modified in the code which executes before
this check, r8 no longer contains the expected TI_FLAGS information.

As a result check for comparison with _TIF_NEED_RESCHED was failing even if
NEED_RESCHED bit is set in the current thread_info flag. Due to this,
preempt_schedule_irq() and in turn scheduler was not getting called even if
highest priority task is ready for execution.

So, store temporary results in r0 instead of r8 to prevent r8 from getting
modified as subsequent code is dependent on its value.

Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
CC: <stable@vger.kernel.org> [v3.7+]
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/mm: Always invalidate tlb on hpte invalidate and update
Aneesh Kumar K.V [Fri, 31 May 2013 01:03:24 +0000 (01:03 +0000)]
powerpc/mm: Always invalidate tlb on hpte invalidate and update

If a hash bucket gets full, we "evict" a more/less random entry from it.
When we do that we don't invalidate the TLB (hpte_remove) because we assume
the old translation is still technically "valid". This implies that when
we are invalidating or updating pte, even if HPTE entry is not valid
we should do a tlb invalidate.

This was a regression introduced by b1022fbd293564de91596b8775340cf41ad5214c

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/pseries: Improve stream generation comments in copypage/user
Michael Neuling [Wed, 29 May 2013 19:34:29 +0000 (19:34 +0000)]
powerpc/pseries: Improve stream generation comments in copypage/user

No code changes, just documenting what's happening a little better.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/pseries: Kill all prefetch streams on context switch
Michael Neuling [Wed, 29 May 2013 19:34:27 +0000 (19:34 +0000)]
powerpc/pseries: Kill all prefetch streams on context switch

On context switch, we should have no prefetch streams leak from one
userspace process to another.  This frees up prefetch resources for the
next process.

Based on patch from Milton Miller.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/cputable: Fix oprofile_cpu_type on power8
Nishanth Aravamudan [Tue, 28 May 2013 10:39:50 +0000 (10:39 +0000)]
powerpc/cputable: Fix oprofile_cpu_type on power8

Maynard informed me that neither the oprofile kernel module nor oprofile
userspace has been updated to support that "legacy" oprofile module
interface for power8, which is indicated by "ppc64/power8." This results
in no samples. The solution is to default to the "timer" type, instead.
The raw entry also should be updated, as "ppc64/ibm-compat-v1" indicates
to oprofile userspace to use "compatibility events" which are obsolete
in ISA 2.07.

Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/mpic: Fix irq distribution problem when MPIC_SINGLE_DEST_CPU
chenhui zhao [Mon, 27 May 2013 21:59:43 +0000 (21:59 +0000)]
powerpc/mpic: Fix irq distribution problem when MPIC_SINGLE_DEST_CPU

For the mpic with a flag MPIC_SINGLE_DEST_CPU, only one bit should be
set in interrupt destination registers.

The code is applicable to 64-bit platforms as well as 32-bit.

Signed-off-by: Zhao Chenhui <chenhui.zhao@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
11 years agopowerpc/tm: Fix userspace stack corruption on signal delivery for active transactions
Michael Neuling [Sun, 26 May 2013 18:09:41 +0000 (18:09 +0000)]
powerpc/tm: Fix userspace stack corruption on signal delivery for active transactions

When in an active transaction that takes a signal, we need to be careful with
the stack.  It's possible that the stack has moved back up after the tbegin.
The obvious case here is when the tbegin is called inside a function that
returns before a tend.  In this case, the stack is part of the checkpointed
transactional memory state.  If we write over this non transactionally or in
suspend, we are in trouble because if we get a tm abort, the program counter
and stack pointer will be back at the tbegin but our in memory stack won't be
valid anymore.

To avoid this, when taking a signal in an active transaction, we need to use
the stack pointer from the checkpointed state, rather than the speculated
state.  This ensures that the signal context (written tm suspended) will be
written below the stack required for the rollback.  The transaction is aborted
becuase of the treclaim, so any memory written between the tbegin and the
signal will be rolled back anyway.

For signals taken in non-TM or suspended mode, we use the
normal/non-checkpointed stack pointer.

Tested with 64 and 32 bit signals

Signed-off-by: Michael Neuling <mikey@neuling.org>
Cc: <stable@vger.kernel.org> # v3.9
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>