08 Oct, 2016
2 commits
-
Pull powerpc updates from Michael Ellerman:
"Highlights:
- Major rework of Book3S 64-bit exception vectors (Nicholas Piggin)
- Use gas sections for arranging exception vectors et. al.
- Large set of TM cleanups and selftests (Cyril Bur)
- Enable transactional memory (TM) lazily for userspace (Cyril Bur)
- Support for XZ compression in the zImage wrapper (Oliver
O'Halloran)
- Add support for bpf constant blinding (Naveen N. Rao)
- Beginnings of upstream support for PA Semi Nemo motherboards
(Darren Stevens)Fixes:
- Ensure .mem(init|exit).text are within _stext/_etext (Michael
Ellerman)
- xmon: Don't use ld on 32-bit (Michael Ellerman)
- vdso64: Use double word compare on pointers (Anton Blanchard)
- powerpc/nvram: Fix an incorrect partition merge (Pan Xinhui)
- powerpc: Fix usage of _PAGE_RO in hugepage (Christophe Leroy)
- powerpc/mm: Update FORCE_MAX_ZONEORDER range to allow hugetlb w/4K
(Aneesh Kumar K.V)
- Fix memory leak in queue_hotplug_event() error path (Andrew
Donnellan)
- Replay hypervisor maintenance interrupt first (Nicholas Piggin)Various performance optimisations (Anton Blanchard):
- Align hot loops of memset() and backwards_memcpy()
- During context switch, check before setting mm_cpumask
- Remove static branch prediction in atomic{, 64}_add_unless
- Only disable HAVE_EFFICIENT_UNALIGNED_ACCESS on POWER7 little
endian
- Set default CPU type to POWER8 for little endian buildsCleanups & features:
- Sparse fixes/cleanups (Daniel Axtens)
- Preserve CFAR value on SLB miss caused by access to bogus address
(Paul Mackerras)
- Radix MMU fixups for POWER9 (Aneesh Kumar K.V)
- Support for setting used_(vsr|vr|spe) in sigreturn path (for CRIU)
(Simon Guo)
- Optimise syscall entry for virtual, relocatable case (Nicholas
Piggin)
- Optimise MSR handling in exception handling (Nicholas Piggin)
- Support for kexec with Radix MMU (Benjamin Herrenschmidt)
- powernv EEH fixes (Russell Currey)
- Suprise PCI hotplug support for powernv (Gavin Shan)
- Endian/sparse fixes for powernv PCI (Gavin Shan)
- Defconfig updates (Anton Blanchard)
- KVM: PPC: Book3S HV: Migrate pinned pages out of CMA (Balbir Singh)
- cxl: Flush PSL cache before resetting the adapter (Frederic Barrat)
- cxl: replace loop with for_each_child_of_node(), remove unneeded
of_node_put() (Andrew Donnellan)
- Fix HV facility unavailable to use correct handler (Nicholas
Piggin)
- Remove unnecessary syscall trampoline (Nicholas Piggin)
- fadump: Fix build break when CONFIG_PROC_VMCORE=n (Michael
Ellerman)
- Quieten EEH message when no adapters are found (Anton Blanchard)
- powernv: Add PHB register dump debugfs handle (Russell Currey)
- Use kprobe blacklist for exception handlers & asm functions
(Nicholas Piggin)
- Document the syscall ABI (Nicholas Piggin)
- MAINTAINERS: Update cxl maintainers (Michael Neuling)
- powerpc: Remove all usages of NO_IRQ (Michael Ellerman)Minor cleanups:
- Andrew Donnellan, Christophe Leroy, Colin Ian King, Cyril Bur,
Frederic Barrat, Pan Xinhui, PrasannaKumar Muralidharan, Rui Teng,
Simon Guo"* tag 'powerpc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (156 commits)
powerpc/bpf: Add support for bpf constant blinding
powerpc/bpf: Implement support for tail calls
powerpc/bpf: Introduce accessors for using the tmp local stack space
powerpc/fadump: Fix build break when CONFIG_PROC_VMCORE=n
powerpc: tm: Enable transactional memory (TM) lazily for userspace
powerpc/tm: Add TM Unavailable Exception
powerpc: Remove do_load_up_transact_{fpu,altivec}
powerpc: tm: Rename transct_(*) to ck(\1)_state
powerpc: tm: Always use fp_state and vr_state to store live registers
selftests/powerpc: Add checks for transactional VSXs in signal contexts
selftests/powerpc: Add checks for transactional VMXs in signal contexts
selftests/powerpc: Add checks for transactional FPUs in signal contexts
selftests/powerpc: Add checks for transactional GPRs in signal contexts
selftests/powerpc: Check that signals always get delivered
selftests/powerpc: Add TM tcheck helpers in C
selftests/powerpc: Allow tests to extend their kill timeout
selftests/powerpc: Introduce GPR asm helper header file
selftests/powerpc: Move VMX stack frame macros to header file
selftests/powerpc: Rework FPU stack placement macros and move to header file
selftests/powerpc: Check for VSX preservation across userspace preemption
... -
Pull SCSI updates from James Bottomley:
"This update includes the usual round of major driver updates (hpsa,
be2iscsi, hisi_sas, zfcp, cxlflash). There's a new incarnation of hpsa
called smartpqi for which a driver is added, there's some cleanup work
of the ibm vscsi target and updates to libfc, plus a whole host of
minor fixes and updates and finally the removal of several ISA drivers
which seem not to have been used for years"* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (173 commits)
scsi: mvsas: Mark symbols static where possible
scsi: pm8001: Mark symbols static where possible
scsi: arcmsr: Simplify user_len checking
scsi: fcoe: fix off by one in eth2fc_speed()
scsi: dtc: remove from tree
scsi: t128: remove from tree
scsi: pas16: remove from tree
scsi: u14-34f: remove from tree
scsi: ultrastor: remove from tree
scsi: in2000: remove from tree
scsi: wd7000: remove from tree
scsi: scsi_dh_alua: Fix memory leak in alua_rtpg()
scsi: lpfc: Mark symbols static where possible
scsi: hpsa: correct call to hpsa_do_reset
scsi: ufs: Get a TM service response from the correct offset
scsi: ibmvfc: Fix I/O hang when port is not mapped
scsi: megaraid_sas: clean function declarations in megaraid_sas_base.c up
scsi: ipr: Remove redundant messages at adapter init time
scsi: ipr: Don't log unnecessary 9084 error details
scsi: smartpqi: raid bypass lba calculation fix
...
20 Sep, 2016
1 commit
-
Add some documentation for the 64-bit syscall ABI, which doesn't seem
to be documented elsewhere.This attempts to document existing practice. The only small discrepancy
is glibc clobbers not quite matching the kernel (e.g., xer, some
vsyscalls trash cr1 whereas glibc only clobbers cr0). These will be
resolved after this document is merged.Signed-off-by: Nicholas Piggin
Signed-off-by: Michael Ellerman
29 Aug, 2016
1 commit
-
Userspace can begin and suspend a transaction within the signal
handler which means they might enter sys_rt_sigreturn() with the
processor in suspended state.sys_rt_sigreturn() wants to restore process context (which may have
been in a transaction before signal delivery). To do this it must
restore TM SPRS. To achieve this, any transaction initiated within the
signal frame must be discarded in order to be able to restore TM SPRs
as TM SPRs can only be manipulated non-transactionally..
>From the PowerPC ISA:
TM Bad Thing Exception [Category: Transactional Memory]
An attempt is made to execute a mtspr targeting a TM register in
other than Non-transactional state.Not doing so results in a TM Bad Thing:
[12045.221359] Kernel BUG at c000000000050a40 [verbose debug info unavailable]
[12045.221470] Unexpected TM Bad Thing exception at c000000000050a40 (msr 0x201033)
[12045.221540] Oops: Unrecoverable exception, sig: 6 [#1]
[12045.221586] SMP NR_CPUS=2048 NUMA PowerNV
[12045.221634] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE
nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4
xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter
ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables kvm_hv kvm
uio_pdrv_genirq ipmi_powernv uio powernv_rng ipmi_msghandler autofs4 ses enclosure
scsi_transport_sas bnx2x ipr mdio libcrc32c
[12045.222167] CPU: 68 PID: 6178 Comm: sigreturnpanic Not tainted 4.7.0 #34
[12045.222224] task: c0000000fce38600 ti: c0000000fceb4000 task.ti: c0000000fceb4000
[12045.222293] NIP: c000000000050a40 LR: c0000000000163bc CTR: 0000000000000000
[12045.222361] REGS: c0000000fceb7ac0 TRAP: 0700 Not tainted (4.7.0)
[12045.222418] MSR: 9000000300201033 CR: 28444280 XER: 20000000
[12045.222625] CFAR: c0000000000163b8 SOFTE: 0 PACATMSCRATCH: 900000014280f033
GPR00: 01100000b8000001 c0000000fceb7d40 c00000000139c100 c0000000fce390d0
GPR04: 900000034280f033 0000000000000000 0000000000000000 0000000000000000
GPR08: 0000000000000000 b000000000001033 0000000000000001 0000000000000000
GPR12: 0000000000000000 c000000002926400 0000000000000000 0000000000000000
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 0000000000000000 00003ffff98cadd0 00003ffff98cb470 0000000000000000
GPR28: 900000034280f033 c0000000fceb7ea0 0000000000000001 c0000000fce390d0
[12045.223535] NIP [c000000000050a40] tm_restore_sprs+0xc/0x1c
[12045.223584] LR [c0000000000163bc] tm_recheckpoint+0x5c/0xa0
[12045.223630] Call Trace:
[12045.223655] [c0000000fceb7d80] [c000000000026e74] sys_rt_sigreturn+0x494/0x6c0
[12045.223738] [c0000000fceb7e30] [c0000000000092e0] system_call+0x38/0x108
[12045.223806] Instruction dump:
[12045.223841] 7c800164 4e800020 7c0022a6 f80304a8 7c0222a6 f80304b0 7c0122a6 f80304b8
[12045.223955] 4e800020 e80304a8 7c0023a6 e80304b0 e80304b8 7c0123a6 4e800020
[12045.224074] ---[ end trace cb8002ee240bae76 ]---It isn't clear exactly if there is really a use case for userspace
returning with a suspended transaction, however, doing so doesn't (on
its own) constitute a bad frame. As such, this patch simply discards
the transactional state of the context calling the sigreturn and
continues.Reported-by: Laurent Dufour
Signed-off-by: Cyril Bur
Tested-by: Laurent Dufour
Reviewed-by: Laurent Dufour
Acked-by: Simon Guo
Signed-off-by: Benjamin Herrenschmidt
24 Aug, 2016
2 commits
-
Update the block library link in the API documentation.
Signed-off-by: Matthew R. Ochs
Acked-by: Manoj N. Kumar
Signed-off-by: Martin K. Petersen -
Caching the adapter file descriptor and performing a close on behalf of
an application is a poor design. This is due to the fact that once a
file descriptor in installed, it is free to be altered without the
knowledge of the cxlflash driver. This can lead to inconsistencies
between the application and kernel. Furthermore, the nature of the
former design is more exploitable and thus should be abandoned.To support applications performing a close on the adapter file that is
associated with a context, a new flag is introduced to the user API to
indicate to applications that they are responsible for the close
following the cleanup (detach) of a context. The documentation is also
updated to reflect this change in behavior.Inspired-by: Al Viro
Signed-off-by: Matthew R. Ochs
Acked-by: Manoj N. Kumar
Signed-off-by: Martin K. Petersen
11 Apr, 2016
1 commit
-
IBM online documentation for EEH uses "extended error handling" and
"enhanced error handling" to refer to the same thing, in different
places. The only place mentioning it as "enhanced error handling" in the
kernel is the MAINTAINERS file, and it's "extended" in some documentation.IBM originally defined EEH as "enhanced error handling", so standardise
all mentions of EEH to use that term.Signed-off-by: Russell Currey
Acked-by: Gavin Shan
Signed-off-by: Michael Ellerman
09 Mar, 2016
1 commit
-
The new flash.c file contains the logic to flash a new image on the
adapter, through a hcall. It is an iterative process, with chunks of
data of 1M at a time. There are also 2 phases: write and verify. The
flash operation itself is driven from a user-land tool.
Once flashing is successful, an rtas call is made to update the device
tree with the new properties values for the adapter and the AFU(s)Add a new char device for the adapter, so that the flash tool can
access the card, even if there is no valid AFU on it.Co-authored-by: Frederic Barrat
Signed-off-by: Frederic Barrat
Signed-off-by: Christophe Lombard
Reviewed-by: Manoj Kumar
Acked-by: Ian Munsie
Signed-off-by: Michael Ellerman
03 Sep, 2015
1 commit
-
Pull first round of SCSI updates from James Bottomley:
"This includes one new driver: cxlflash plus the usual grab bag of
updates for the major drivers: qla2xxx, ipr, storvsc, pm80xx, hptiop,
plus a few assorted fixes.There's another tranch coming, but I want to incubate it another few
days in the checkers, plus it includes a mpt2sas separated lifetime
fix, which Avago won't get done testing until Friday"* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (85 commits)
aic94xx: set an error code on failure
storvsc: Set the error code correctly in failure conditions
storvsc: Allow write_same when host is windows 10
storvsc: use storage protocol version to determine storage capabilities
storvsc: use correct defaults for values determined by protocol negotiation
storvsc: Untangle the storage protocol negotiation from the vmbus protocol negotiation.
storvsc: Use a single value to track protocol versions
storvsc: Rather than look for sets of specific protocol versions, make decisions based on ranges.
cxlflash: Remove unused variable from queuecommand
cxlflash: shift wrapping bug in afu_link_reset()
cxlflash: off by one bug in cxlflash_show_port_status()
cxlflash: Virtual LUN support
cxlflash: Superpipe support
cxlflash: Base error recovery support
qla2xxx: Update driver version to 8.07.00.26-k
qla2xxx: Add pci device id 0x2261.
qla2xxx: Fix missing device login retries.
qla2xxx: do not clear slot in outstanding cmd array
qla2xxx: Remove decrement of sp reference count in abort handler.
qla2xxx: Add support to show MPI and PEP FW version for ISP27xx.
...
27 Aug, 2015
2 commits
-
Add support for physical LUN segmentation (virtual LUNs) to device
driver supporting the IBM CXL Flash adapter. This patch allows user
space applications to virtually segment a physical LUN into N virtual
LUNs, taking advantage of the translation features provided by this
adapter.Signed-off-by: Matthew R. Ochs
Signed-off-by: Manoj N. Kumar
Reviewed-by: Michael Neuling
Reviewed-by: Wen Xiong
Signed-off-by: James Bottomley -
Add superpipe supporting infrastructure to device driver for the IBM CXL
Flash adapter. This patch allows userspace applications to take advantage
of the accelerated I/O features that this adapter provides and bypass the
traditional filesystem stack.Signed-off-by: Matthew R. Ochs
Signed-off-by: Manoj N. Kumar
Reviewed-by: Michael Neuling
Reviewed-by: Wen Xiong
Reviewed-by: Brian King
Signed-off-by: James Bottomley
11 Jul, 2015
1 commit
-
This patch fix some spelling typo found in Documentation/powerpc.
Signed-off-by: Masanari Iida
Acked-by: Ian Munsie
Signed-off-by: Jonathan Corbet
19 Jun, 2015
1 commit
-
This patch changes the syscall handler to doom (tabort) active
transactions when a syscall is made and return very early without
performing the syscall and keeping side effects to a minimum (no CPU
accounting or system call tracing is performed). Also included is a
new HWCAP2 bit, PPC_FEATURE2_HTM_NOSC, to indicate this
behaviour to userspace.Currently, the system call instruction automatically suspends an
active transaction which causes side effects to persist when an active
transaction fails.This does change the kernel's behaviour, but in a way that was
documented as unsupported. It doesn't reduce functionality as
syscalls will still be performed after tsuspend; it just requires that
the transaction be explicitly suspended. It also provides a
consistent interface and makes the behaviour of user code
substantially the same across powerpc and platforms that do not
support suspended transactions (e.g. x86 and s390).Performance measurements using
http://ozlabs.org/~anton/junkcode/null_syscall.c indicate the cost of
a normal (non-aborted) system call increases by about 0.25%.Signed-off-by: Sam Bobroff
Signed-off-by: Michael Ellerman
07 Jun, 2015
1 commit
-
This patch adds a new documentation file explaining the DSCR support on
powerpc platforms. This explains DSCR related data structure, code paths
and also available user interfaces. Any further functional changes to
the DSCR support in the kernel should definitely update the
documentation here.Signed-off-by: Anshuman Khandual
Signed-off-by: Michael Ellerman
03 Jun, 2015
1 commit
-
Now that libcxl is public, let's document it.
Signed-off-by: Michael Neuling
Acked-by: Ian Munsie
Signed-off-by: Michael Ellerman
30 Apr, 2015
1 commit
-
This reverts commit feba40362b11341bee6d8ed58d54b896abbd9f84.
Although the principle of this change is good, the implementation has a
few issues.Firstly we can sometimes fail to abort a syscall because r12 may have
been clobbered by C code if we went down the virtual CPU accounting
path, or if syscall tracing was enabled.Secondly we have decided that it is safer to abort the syscall even
earlier in the syscall entry path, so that we avoid the syscall tracing
path when we are transactional.So that we have time to thoroughly test those changes we have decided to
revert this for this merge window and will merge the fixed version in
the next window.NB. Rather than reverting the selftest we just drop tm-syscall from
TEST_PROGS so that it's not run by default.Fixes: feba40362b11 ("powerpc/tm: Abort syscalls in active transactions")
Signed-off-by: Michael Ellerman
14 Apr, 2015
1 commit
-
Merge Richard's work to support SR-IOV on PowerNV. All generic PCI
patches acked by Bjorn.Some minor conflicts with Daniel's pci_controller_ops work.
Conflicts:
arch/powerpc/include/asm/machdep.h
arch/powerpc/platforms/powernv/pci-ioda.c
11 Apr, 2015
2 commits
-
Signed-off-by: Sam Bobroff
Signed-off-by: Michael Ellerman -
This patch changes the syscall handler to doom (tabort) active
transactions when a syscall is made and return immediately without
performing the syscall.Currently, the system call instruction automatically suspends an
active transaction which causes side effects to persist when an active
transaction fails.This does change the kernel's behaviour, but in a way that was
documented as unsupported. It doesn't reduce functionality because
syscalls will still be performed after tsuspend. It also provides a
consistent interface and makes the behaviour of user code
substantially the same across powerpc and platforms that do not
support suspended transactions (e.g. x86 and s390).Performance measurements using
http://ozlabs.org/~anton/junkcode/null_syscall.c
indicate the cost of a system call increases by about 0.5%.Signed-off-by: Sam Bobroff
Acked-By: Michael Neuling
Signed-off-by: Michael Ellerman
31 Mar, 2015
1 commit
-
In order to enable SRIOV on PowerNV platform, the PF's IOV BAR needs to be
adjusted:1. size expanded
2. aligned to M64BT sizeThis patch documents this change on the reason and how.
[bhelgaas: reformat, clarify, expand]
Signed-off-by: Wei Yang
Signed-off-by: Benjamin Herrenschmidt
08 Oct, 2014
1 commit
-
This documentation gives an overview of the hardware architecture, userspace
APIs via /dev/cxl/afuM.N and the syfs files. It also adds a MAINTAINERS file
entry for cxl.Signed-off-by: Ian Munsie
Signed-off-by: Michael Neuling
Signed-off-by: Michael Ellerman
28 Jul, 2014
1 commit
-
The 440 target hasn't been properly functioning for a few releases and
before I was the only one who fixes a very serious bug that indicates to
me that nobody used it before either.Furthermore KVM on 440 is slow to the extent of unusable.
We don't have to carry along completely unused code. Remove 440 and give
us one less thing to worry about.Signed-off-by: Alexander Graf
11 Jun, 2014
1 commit
-
Pull powerpc updates from Ben Herrenschmidt:
"Here is the bulk of the powerpc changes for this merge window. It got
a bit delayed in part because I wasn't paying attention, and in part
because I discovered I had a core PCI change without a PCI maintainer
ack in it. Bjorn eventually agreed it was ok to merge it though we'll
probably improve it later and I didn't want to rebase to add his ack.There is going to be a bit more next week, essentially fixes that I
still want to sort through and test.The biggest item this time is the support to build the ppc64 LE kernel
with our new v2 ABI. We previously supported v2 userspace but the
kernel itself was a tougher nut to crack. This is now sorted mostly
thanks to Anton and Rusty.We also have a fairly big series from Cedric that add support for
64-bit LE zImage boot wrapper. This was made harder by the fact that
traditionally our zImage wrapper was always 32-bit, but our new LE
toolchains don't really support 32-bit anymore (it's somewhat there
but not really "supported") so we didn't want to rely on it. This
meant more churn that just endian fixes.This brings some more LE bits as well, such as the ability to run in
LE mode without a hypervisor (ie. under OPAL firmware) by doing the
right OPAL call to reinitialize the CPU to take HV interrupts in the
right mode and the usual pile of endian fixes.There's another series from Gavin adding EEH improvements (one day we
*will* have a release with less than 20 EEH patches, I promise!).Another highlight is the support for the "Split core" functionality on
P8 by Michael. This allows a P8 core to be split into "sub cores" of
4 threads which allows the subcores to run different guests under KVM
(the HW still doesn't support a partition per thread).And then the usual misc bits and fixes ..."
[ Further delayed by gmail deciding that BenH is a dirty spammer.
Google knows. ]* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (155 commits)
powerpc/powernv: Add missing include to LPC code
selftests/powerpc: Test the THP bug we fixed in the previous commit
powerpc/mm: Check paca psize is up to date for huge mappings
powerpc/powernv: Pass buffer size to OPAL validate flash call
powerpc/pseries: hcall functions are exported to modules, need _GLOBAL_TOC()
powerpc: Exported functions __clear_user and copy_page use r2 so need _GLOBAL_TOC()
powerpc/powernv: Set memory_block_size_bytes to 256MB
powerpc: Allow ppc_md platform hook to override memory_block_size_bytes
powerpc/powernv: Fix endian issues in memory error handling code
powerpc/eeh: Skip eeh sysfs when eeh is disabled
powerpc: 64bit sendfile is capped at 2GB
powerpc/powernv: Provide debugfs access to the LPC bus via OPAL
powerpc/serial: Use saner flags when creating legacy ports
powerpc: Add cpu family documentation
powerpc/xmon: Fix up xmon format strings
powerpc/powernv: Add calls to support little endian host
powerpc: Document sysfs DSCR interface
powerpc: Fix regression of per-CPU DSCR setting
powerpc: Split __SYSFS_SPRSETUP macro
arch: powerpc/fadump: Cleaning up inconsistent NULL checks
...
05 Jun, 2014
1 commit
-
This patch adds some documentation on the different cpu families
supported by arch/powerpc.Signed-off-by: Michael Ellerman
Signed-off-by: Benjamin Herrenschmidt
05 May, 2014
1 commit
-
Fixed multiple spelling errors.
Acked-by: Randy Dunlap
Signed-off-by: Carlos E. Garcia
Signed-off-by: Jiri Kosina
27 Aug, 2013
1 commit
-
People have been dropping things in here without updating the index, do
it for them.Signed-off-by: Michael Ellerman
Signed-off-by: Benjamin Herrenschmidt
01 Jul, 2013
1 commit
-
Add support for EBB (Event Based Branches) on 64-bit book3s. See the
included documentation for more details.EBBs are a feature which allows the hardware to branch directly to a
specified user space address when a PMU event overflows. This can be
used by programs for self-monitoring with no kernel involvement in the
inner loop.Most of the logic is in the generic book3s code, primarily to avoid a
proliferation of PMU callbacks.Signed-off-by: Michael Ellerman
Signed-off-by: Benjamin Herrenschmidt
01 Jun, 2013
3 commits
-
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
Cc: # v3.9
Signed-off-by: Benjamin Herrenschmidt -
If we are emulating an instruction inside an active user transaction that
touches memory, the kernel can't emulate it as it operates in transactional
suspend context. We need to abort these transactions and send them back to
userspace for the hardware to rollback.We can service these if the user transaction is in suspend mode, since the
kernel will operate in the same suspend context.This adds a check to all alignment faults and to specific instruction
emulations (only string instructions for now). If the user process is in an
active (non-suspended) transaction, we abort the transaction go back to
userspace allowing the HW to roll back the transaction and tell the user of the
failure. This also adds new tm abort cause codes to report the reason of the
persistent error to the user.Crappy test case here http://neuling.org/devel/junkcode/aligntm.c
Signed-off-by: Michael Neuling
Cc: # v3.9
Signed-off-by: Benjamin Herrenschmidt -
Signed-off-by: Michael Neuling
Cc: # 3.9 only
Signed-off-by: Benjamin Herrenschmidt
18 Apr, 2013
2 commits
-
This adds new debug feature information so that the DAWR can be
identified by userspace tools like GDB.Unfortunately the DAWR doesn't sit nicely into the current description
that ptrace provides to userspace via struct ppc_debug_info. It doesn't
allow for specifying that only some ranges are possible or even the end
alignment constraints (DAWR only allows 512 byte wide ranges which can't
cross a 512 byte boundary).After talking to Edjunior Machado (GDB ppc developer), it was decided
this was the best approach. Just mark it as debug feature DAWR and
tools like GDB can internally decide the constraints.Signed-off-by: Michael Neuling
Signed-off-by: Michael Ellerman -
PPC_PREP is marked as BROKEN since v2.6.15. Remove all PReP specific
code now.Signed-off-by: Paul Bolle
Signed-off-by: Michael Ellerman
15 Feb, 2013
1 commit
-
Signed-off-by: Matt Evans
Signed-off-by: Michael Neuling
Signed-off-by: Benjamin Herrenschmidt
10 Jan, 2013
1 commit
-
ppc -> powerpc
Signed-off-by: Thomas Waldecker
Signed-off-by: Benjamin Herrenschmidt
15 Nov, 2012
1 commit
-
PPC_PTRACE_GETHWDBGINFO, PPC_PTRACE_SETHWDEBUG and PPC_PTRACE_DELHWDEBUG are
PowerPC specific ptrace flags that use the watchpoint register. While they are
targeted primarily towards BookE users, user-space applications such as GDB
have started using them for BookS too. This patch enables the use of generic
hardware breakpoint interfaces for these new flags.Apart from the usual benefits of using generic hw-breakpoint interfaces, these
changes allow debuggers (such as GDB) to use a common set of ptrace flags for
their watchpoint needs and allow more precise breakpoint specification (length
of the variable can be specified).Mikey added: rebased and added dbginfo.features around #ifdef
CONFIG_HAVE_HW_BREAKPOINTSigned-off-by: K.Prasad
Acked-by: David Gibson
Signed-off-by: Benjamin Herrenschmidt
Signed-off-by: Michael Neuling
Signed-off-by: Benjamin Herrenschmidt
19 Mar, 2012
1 commit
-
Fix all trailing whitespace errors reported by checkpatch.
Signed-off-by: Andrea Gelmini
Signed-off-by: Anatolij Gustschin
23 Feb, 2012
2 commits
-
Remove the phyp assisted dump implementation which is not is use.
Signed-off-by: Mahesh Salgaonkar
Signed-off-by: Benjamin Herrenschmidt -
Documentation for firmware-assisted dump. This document is based on the
original documentation written for phyp assisted dump by Linas Vepstas
and Manish Ahuja, with few changes to reflect the current implementation.Signed-off-by: Mahesh Salgaonkar
Signed-off-by: Benjamin Herrenschmidt
31 Mar, 2011
1 commit
-
Fixes generated by 'codespell' and manually reviewed.
Signed-off-by: Lucas De Marchi
17 Mar, 2011
1 commit
-
The device tree infrastructure is being genericized so its documentation
moved out of the PowerPC directory.Signed-off-by: Rob Landley
Signed-off-by: Randy Dunlap
Signed-off-by: Linus Torvalds
