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2016-07-26selftests/powerpc: exec() with suspended transactionCyril Bur5-18/+98
Perform an exec() class syscall with a suspended transaction. This is a test for the bug we fixed in 8e96a87c5431 ("powerpc/tm: Always reclaim in start_thread() for exec() class syscalls"). Signed-off-by: Cyril Bur <cyrilbur@gmail.com> [mpe: Fix build errors, use a single binary for the test] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-14selftests/powerpc: Add a test for PROT_SAOMichael Ellerman4-1/+51
PROT_SAO is a powerpc-specific flag to mmap(), and we rely on arch specific logic to allow it to be passed to mmap(). Add a small test to ensure mmap() accepts PROT_SAO. We don't have a good way to test that it actually causes the mapping to be created with the right flags, so for now we just touch the mapping so it's faulted in. In future we might be able to do something better. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-07selftests/powerpc: Use "Delta" rather than "Error" in normal outputMichael Ellerman1-1/+1
Use "Delta" to refer to the difference between measurements, rather than "Error", so scripts that look for "Error" aren't confused into thinking there was a failure. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-05selftests/powerpc: Test unaligned copy and pasteChris Smart10-1/+332
Test that an ISA 3.0 compliant machine performing an unaligned copy, copy_first, paste or paste_last is sent a SIGBUS. Signed-off-by: Chris Smart <chris@distroguy.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-05selftests/powerpc: Import Anton's mmap & futex micro benchmarksMichael Ellerman4-1/+86
These are useful little loops for smoke testing performance. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-05selftests/powerpc: Fix generation of vector instructions/types in context_switchCyril Bur2-3/+9
Currently it doesn't appear the resulting binary actually uses any Altivec or VSX instructions the solution is to explicitly tell GCC to use vector instructions and use vector types in the code. Part of this this issue can be GCC version specific: GCC 4.9.x is happy to use Altivec and VSX instructions if altivec.h is includedi (and possibly if vector types are used), this also means that 4.9.x will use VSX instructions even if only -maltivec is passed. It is also possible that Altivec instructions will be used even without -maltivec or -mabi=altivec. GCC 5.2.x complains about the lack of -maltivec parameter if altivec.h is included and will not use VSX unless -mvsx is present on commandline. GCC 5.3.0 has a regression that means __attribute__((__target__("no-vsx")) fails to build. A fix is targeted for 5.4. Furthermore LTO (Link Time Optimisation) doesn't play well with __attribute__((__target__("no-vsx")), LTO can cause GCC to forget about the attribute and compile with VSX instructions regardless. Be wary when enabling -flfo for this test. Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-05selftests/powerpc: Fix usage message in context_switchCyril Bur1-3/+3
When we inverted the behaviour of the flags we forgot to update the usage message. Fixes: 51c21e72eb99 ("selftests/powerpc: Make context_switch touch FP/altivec/vector by default") Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-05selftests/powerpc/pmu: Use signed long to read perf_event_paranoidCyril Bur1-3/+3
Excerpt from man 2 perf_event_open: /proc/sys/kernel/perf_event_paranoid The perf_event_paranoid file can be set to restrict access to the performance counters. 2 allow only user-space measurements. 1 allow both kernel and user measurements (default). 0 allow access to CPU-specific data but not raw tracepoint samples. -1 no restrictions. require_paranoia_below() should return 0 if perf_event_paranoid is below a specified level, the value from perf_event_paranoid is read into an unsigned long so the incorrect value is returned when perf_event_paranoid is set to -1. Without this patch applied there is the same number of selftests/powerpc which skip when /proc/sys/kernel/perf_event_paranoid is set to 1 or -1 but no skips when set to zero. With this patch applied there are no skipped selftests/powerpc test when /proc/sys/kernel/perf_event_paranoid is set to 0 or -1. Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-06-21selftests/powerpc: Load Monitor Register TestsJack Miller6-1/+227
Adds two tests. One is a simple test to ensure that the new registers LMRR and LMSER are properly maintained. The other actually uses the existing EBB test infrastructure to test that LMRR and LMSER behave as documented. Signed-off-by: Jack Miller <jack@codezen.org> Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-05-11selftests/powerpc: Add test to check if TM SPRs are corruptedRashmica Gupta3-1/+146
Testing that the TM SPRs are behaving the way they should. Uses more threads than cpus to see if the following register values persist with context switching: - the FS (failure summary) flag in TEXASR - TFIAR and TFHAR Signed-off-by: Rashmica Gupta <rashmicy@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-05-11selftests/powerpc: Add TM test to check if TAR is corruptedRashmica Gupta3-1/+92
If the transaction is aborted, the TAR should be rolled back to the checkpointed value before the transaction began. The value written to the TAR when the transaction is suspended should only remain there if the transaction completes successfully. Signed-off-by: Rashmica Gupta <rashmicy@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-05-11selftests/powerpc: Add test for forking inside transactionRashmica Gupta3-1/+44
This test does a fork syscall inside a transaction. Basic sniff test to see if we can enter the kernel during a transaction. Signed-off-by: Rashmica Gupta <rashmicy@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-05-11selftests/powerpc: Standardise TM callsRashmica Gupta2-13/+7
Currently tbegin, tend etc are written as opcodes or asm instructions. So standardise these to asm instructions. Signed-off-by: Rashmica Gupta <rashmicy@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-05-11selftests/powerpc: Make reg.h common to all powerpc selftestsRashmica Gupta4-8/+13
Currently there is a reg.h in pmu/ebb that has defines that are useful in other powerpc selftests so move this up into selftests/powerpc folder. Also include in utils.h - as this is often used in self tests. Add in some other useful register defines. Signed-off-by: Rashmica Gupta <rashmicy@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-05-11selftests/powerpc: Fix subpage_prot test to return !0 on failureMichael Ellerman1-8/+10
It's helpful for automated testing if the test returns error codes back to the calling program. While we're here fix all the usages of %p to remove the double 0x, ie. %p already includes 0x. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
2016-05-11selftests/powerpc: Test cp_abort during context switchChris Smart5-0/+129
Test that performing a copy paste sequence in userspace on P9 does not result in a leak of the copy into the paste of another process. This is based on Anton Blanchard's context_switch benchmarking code. It sets up two processes tied to the same CPU, one which copies and one which pastes. The paste should never succeed and the test fails if it does. This is a test for commit, "8a64904 powerpc: Add support for userspace P9 copy paste." Patch created with much assistance from Michael Neuling <mikey@neuling.org> Signed-off-by: Chris Smart <chris@distroguy.com> Reviewed-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-03-02selftests/powerpc: Test FPU and VMX regs in signal ucontextCyril Bur4-1/+296
Load up the non volatile FPU and VMX regs and ensure that they are the expected value in a signal handler Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-03-02selftests/powerpc: Test preservation of FPU and VMX regs across preemptionCyril Bur6-3/+310
Loop in assembly checking the registers with many threads. Signed-off-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-03-02selftests/powerpc: Test the preservation of FPU and VMX regs across syscallCyril Bur8-1/+625
Test that the non volatile floating point and Altivec registers get correctly preserved across the fork() syscall. fork() works nicely for this purpose, the registers should be the same for both parent and child Signed-off-by: Cyril Bur <cyrilbur@gmail.com> [mpe: Add include guards to basic_asm.h, minor formatting] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-03-02selftests/powerpc: Remove -flto from common CFLAGSSuraj Jitindar Singh1-1/+1
LTO can cause GCC to inline some functions which have attributes set. The act of inlining the functions can lead to GCC forgetting about the attributes which leads to incorrect tests. Notable example being: __attribute__((__target__("no-vsx"))) LTO can also interact strangely with custom assembly functions and cause tests to intermittently fail. Both these cases are hard to detect and require manual inspection of binaries which is unlikely to happen for all tests. Furthermore, LTO optimisations are not necessary for selftests and correctness is paramount and as such it is best to disable LTO. LTO can be enabled on a per test basis. A pseries_le_defconfig kernel on a POWER8 was used to determine that the same subset of selftests pass and fail with and without -flto in the common Makefile. Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com> Reviewed-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-03-02selftests/powerpc: Fix out of bounds access in TM signal testMichael Ellerman1-1/+1
Gcc helpfully points out that we're accessing past the end of the gprs array: tm-signal-msr-resv.c: In function 'signal_usr1': tm-signal-msr-resv.c:43:37: error: array subscript is above array bounds [-Werror=array-bounds] ucp->uc_mcontext.regs->gpr[PT_MSR] |= (7ULL); We haven't noticed previously because -flto was hiding it somehow. The code is confused, PT_MSR isn't a gpr, instead it's in uc_regs->gregs, so fix it. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-17selftests/powerpc: Add script to test HMI functionalityDaniel Axtens1-0/+89
HMIs (Hypervisor Management|Maintenance Interrupts) are a class of interrupt on POWER systems. HMI support has traditionally been exceptionally difficult to test, however Skiboot ships a tool that, with the correct magic numbers, will inject them. This, therefore, is a first pass at a script to inject HMIs and monitor Linux's response. It injects an HMI on each core on every chip in turn It then watches dmesg to see if it's acknowledged by Linux. On a Tuletta, I observed that we see 8 (or sometimes 9 or more) events per injection, regardless of SMT setting, so we wait for 8 before progressing. It sits in a new scripts/ directory in selftests/powerpc, because it's not designed to be run as part of the regular make selftests process. In particular, it is quite possibly going to end up garding lots of your CPUs, so it should only be run if you know how to undo that. CC: Mahesh J Salgaonkar <mahesh.salgaonkar@in.ibm.com> Signed-off-by: Daniel Axtens <dja@axtens.net> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-17selftests/powerpc: Make context_switch touch FP/altivec/vector by defaultMichael Ellerman1-6/+6
Simply because it touches more code paths that way, and therefore tests more things. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Anton Blanchard <anton@samba.org>
2015-12-17selftests/powerpc: Make context_switch do something with no argsMichael Ellerman2-9/+24
For ease of use make the context_switch test do something useful when called with no arguments. Default to a 30 second run, using threads, doing yield, and use any online cpu. Make it print out what it's doing to avoid confusion. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Anton Blanchard <anton@samba.org>
2015-12-17selftests/powerpc: Import Anton's context_switch2 benchmarkMichael Ellerman3-1/+456
This gets referred to a lot in commit messages, so let's pull it into the selftests. Almost vanilla from: http://ozlabs.org/~anton/junkcode/context_switch2.c Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Anton Blanchard <anton@samba.org>
2015-12-17selftests/powerpc: Move pick_online_cpu() up into utils.cMichael Ellerman5-28/+31
We want to use this in another test, so make it available at the top of the powerpc selftests tree. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-14selftests/powerpc: Add test to check if VSRs are corruptedRashmica Gupta3-1/+105
When a transaction is aborted, VSR values should rollback to the checkpointed values before the transaction began. VSRs used elsewhere in the kernel during a transaction, or while the transaction is suspended should not affect the checkpointed values. Prior to the bug fix in commit d31626f70b61 ("powerpc: Don't corrupt transactional state when using FP/VMX in kernel") when VMX was requested by the kernel the .vr_state (which held the checkpointed state of VSRs before the transaction) was overwritten with the current state from outside the transation. Thus if the transaction did not complete, the VSR values would be "rolled back" to potentially incorrect values. Signed-off-by: Rashmica Gupta <rashmicy@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-14selftests/powerpc: Add TM signal with invalid stack testMichael Neuling3-1/+78
Test the kernels signal generation code to ensure it can handle an invalid stack pointer when transactional. Signed-off-by: Michael Neuling <mikey@neuling.org> Tested-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> [mpe: Skip if we don't have TM] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-14selftests/powerpc: Add TM signal return testMichael Neuling3-1/+76
Test the kernel's signal return code to ensure that it doesn't crash when both the transactional and suspend MSR bits are set in the signal context. Signed-off-by: Michael Neuling <mikey@neuling.org> Tested-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> [mpe: Skip if we don't have TM] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-14selftests/powerpc: Skip tm-resched-dscr if we don't have TMMichael Ellerman2-2/+5
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-14selftests/powerpc: Move TM helpers into tm.hMichael Ellerman2-11/+35
Move have_htm_nosc() into a new tm.h, and add a new helper, have_htm() which we'll use in the next patch. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-14selftests/powerpc: Add have_hwcap2() helperMichael Ellerman3-4/+8
We already do this twice and want to add another so add a helper. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-14selftests/powerpc: Move get_auxv_entry() into utils.cMichael Ellerman5-45/+63
This doesn't really belong in harness.c, it's a helper function. So move it into utils.c. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-12-10powerpc: Fix DSCR inheritance over fork()Anton Blanchard2-16/+0
Two DSCR tests have a hack in them: /* * XXX: Force a context switch out so that DSCR * current value is copied into the thread struct * which is required for the child to inherit the * changed value. */ sleep(1); We should not be working around this in the testcase, it is a kernel bug. Fix it by copying the current DSCR to the child, instead of what we had in the thread struct at last context switch. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-11-05Merge tag 'powerpc-4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linuxLinus Torvalds33-3/+244
Pull powerpc updates from Michael Ellerman: - Kconfig: remove BE-only platforms from LE kernel build from Boqun Feng - Refresh ps3_defconfig from Geoff Levand - Emit GNU & SysV hashes for the vdso from Michael Ellerman - Define an enum for the bolted SLB indexes from Anshuman Khandual - Use a local to avoid multiple calls to get_slb_shadow() from Michael Ellerman - Add gettimeofday() benchmark from Michael Neuling - Avoid link stack corruption in __get_datapage() from Michael Neuling - Add virt_to_pfn and use this instead of opencoding from Aneesh Kumar K.V - Add ppc64le_defconfig from Michael Ellerman - pseries: extract of_helpers module from Andy Shevchenko - Correct string length in pseries_of_derive_parent() from Nathan Fontenot - Free the MSI bitmap if it was slab allocated from Denis Kirjanov - Shorten irq_chip name for the SIU from Christophe Leroy - Wait 1s for secondaries to enter OPAL during kexec from Samuel Mendoza-Jonas - Fix _ALIGN_* errors due to type difference, from Aneesh Kumar K.V - powerpc/pseries/hvcserver: don't memset pi_buff if it is null from Colin Ian King - Disable hugepd for 64K page size, from Aneesh Kumar K.V - Differentiate between hugetlb and THP during page walk from Aneesh Kumar K.V - Make PCI non-optional for pseries from Michael Ellerman - Individual System V IPC system calls from Sam bobroff - Add selftest of unmuxed IPC calls from Michael Ellerman - discard .exit.data at runtime from Stephen Rothwell - Delete old orphaned PrPMC 280/2800 DTS and boot file, from Paul Gortmaker - Use of_get_next_parent to simplify code from Christophe Jaillet - Paginate some xmon output from Sam bobroff - Add some more elements to the xmon PACA dump from Michael Ellerman - Allow the tm-syscall selftest to build with old headers from Michael Ellerman - Run EBB selftests only on POWER8 from Denis Kirjanov - Drop CONFIG_TUNE_CELL in favour of CONFIG_CELL_CPU from Michael Ellerman - Avoid reference to potentially freed memory in prom.c from Christophe Jaillet - Quieten boot wrapper output with run_cmd from Geoff Levand - EEH fixes and cleanups from Gavin Shan - Fix recursive fenced PHB on Broadcom shiner adapter from Gavin Shan - Use of_get_next_parent() in of_get_ibm_chip_id() from Michael Ellerman - Fix section mismatch warning in msi_bitmap_alloc() from Denis Kirjanov - Fix ps3-lpm white space from Rudhresh Kumar J - Fix ps3-vuart null dereference from Colin King - nvram: Add missing kfree in error path from Christophe Jaillet - nvram: Fix function name in some errors messages, from Christophe Jaillet - drivers/macintosh: adb: fix misleading Kconfig help text from Aaro Koskinen - agp/uninorth: fix a memleak in create_gatt_table from Denis Kirjanov - cxl: Free virtual PHB when removing from Andrew Donnellan - scripts/kconfig/Makefile: Allow KBUILD_DEFCONFIG to be a target from Michael Ellerman - scripts/kconfig/Makefile: Fix KBUILD_DEFCONFIG check when building with O= from Michael Ellerman - Freescale updates from Scott: Highlights include 64-bit book3e kexec/kdump support, a rework of the qoriq clock driver, device tree changes including qoriq fman nodes, support for a new 85xx board, and some fixes. - MPC5xxx updates from Anatolij: Highlights include a driver for MPC512x LocalPlus Bus FIFO with its device tree binding documentation, mpc512x device tree updates and some minor fixes. * tag 'powerpc-4.4-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (106 commits) powerpc/msi: Fix section mismatch warning in msi_bitmap_alloc() powerpc/prom: Use of_get_next_parent() in of_get_ibm_chip_id() powerpc/pseries: Correct string length in pseries_of_derive_parent() powerpc/e6500: hw tablewalk: make sure we invalidate and write to the same tlb entry powerpc/mpc85xx: Add FSL QorIQ DPAA FMan support to the SoC device tree(s) powerpc/mpc85xx: Create dts components for the FSL QorIQ DPAA FMan powerpc/fsl: Add #clock-cells and clockgen label to clockgen nodes powerpc: handle error case in cpm_muram_alloc() powerpc: mpic: use IRQCHIP_SKIP_SET_WAKE instead of redundant mpic_irq_set_wake powerpc/book3e-64: Enable kexec powerpc/book3e-64/kexec: Set "r4 = 0" when entering spinloop powerpc/booke: Only use VIRT_PHYS_OFFSET on booke32 powerpc/book3e-64/kexec: Enable SMP release powerpc/book3e-64/kexec: create an identity TLB mapping powerpc/book3e-64: Don't limit paca to 256 MiB powerpc/book3e/kdump: Enable crash_kexec_wait_realmode powerpc/book3e: support CONFIG_RELOCATABLE powerpc/booke64: Fix args to copy_and_flush powerpc/book3e-64: rename interrupt_end_book3e with __end_interrupts powerpc/e6500: kexec: Handle hardware threads ...
2015-10-19selftests/powerpc: Run EBB tests only on POWER8Denis Kirjanov24-0/+56
EBB (Event Based Branches) are currently only available on POWER8, so we should skip them on other CPUs. I've found that at least one test loops forever on 970MP (cycles_with_freeze_test). Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org> [mpe: Minor change log editing, add skip to cpu_event_vs_ebb_test] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-10-15selftests/powerpc: Allow the tm-syscall test to build with old headersMichael Ellerman1-2/+12
When building against older kernel headers, currently the tm-syscall test fails to build because PPC_FEATURE2_HTM_NOSC is not defined. Tweak the test so that if PPC_FEATURE2_HTM_NOSC is not defined it still builds, but prints a warning at run time and marks the test as skipped. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-10-15selftests/powerpc: Sort the list of SUB_DIRS to buildMichael Ellerman1-1/+11
This list has gotten too long. Split it into individual lines and sort them, so in future we can add new entries more cleanly. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-10-15selftests/powerpc: Add tests of unmuxed IPC callsMichael Ellerman5-1/+122
This is just a simple test which confirms that the individual IPC syscalls are all available. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-10-13selftests/powerpc: Fix build failure of load_unaligned_zeropad testMichael Ellerman1-0/+9
Commit 7a5692e6e533 ("arch/powerpc: provide zero_bytemask() for big-endian") added a call to __fls() in our word-at-a-time.h. That was fine for the kernel build but missed the fact that we also use word-at-a-time.h in a userspace test. Pulling in the kernel version of __fls() gets messy, so just define our own, it's unlikely to change often. Fixes: 7a5692e6e533 ("arch/powerpc: provide zero_bytemask() for big-endian") Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-10-01powerpc/selftest: Add gettimeofday() benchmarkMichael Neuling4-1/+45
This adds a benchmark directory to the powerpc selftests and adds a gettimeofday() benchmark to it. Suggested-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-08-17selftests/powerpc: Install tempfile so the subpage_prot_file test worksMichael Ellerman1-1/+2
We forgot to install the tempfile, so when the selftests are installed and then run the subpage_prot_file test fails. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-19powerpc/tm: Abort syscalls in active transactionsSam bobroff2-3/+4
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 <sam.bobroff@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-07selftests/powerpc: Add gitignore file for the new DSCR testsAnshuman Khandual1-0/+7
This patch adds .gitignore for all the newly added DSCR tests. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-07selftests/powerpc: Add thread based stress test for DSCR sysfs interfacesMichael Ellerman2-1/+82
This patch adds a test to update the system wide DSCR value repeatedly and then verifies that any thread on any given CPU on the system must be able to see the same DSCR value whether its is being read through the problem state based SPR or the privilege state based SPR. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-07selftests/powerpc: Add test for all DSCR sysfs interfacesAnshuman Khandual2-1/+98
This test continuously updates the system wide DSCR default value in the sysfs interface and makes sure that the same is reflected across all the sysfs interfaces for each individual CPUs present on the system. Acked-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-07selftests/powerpc: Add test for DSCR inheritence across fork & execAnshuman Khandual2-1/+118
This patch adds a test case to verify that the changed DSCR value inside any process would be inherited to it's child across the fork and exec system call. Acked-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-07selftests/powerpc: Add test for DSCR value inheritence across forkAnshuman Khandual2-1/+97
This patch adds a test to verify that the changed DSCR value inside any process would be inherited to it's child process across the fork system call. Acked-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-07selftests/powerpc: Add test for DSCR SPR numbersAnshuman Khandual2-1/+62
This patch adds a test which verifies that the DSCR privilege and problem state SPR read & write accesses while making sure that the results are always the same irrespective of which SPR number is being used. Acked-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2015-06-07selftests/powerpc: Add test for explicitly changing DSCR valueAnshuman Khandual2-1/+72
This patch adds a test which modifies the DSCR using mtspr instruction and verifies the change using mfspr instruction. It uses both the privilege state SPR as well as the problem state SPR for the purpose. Acked-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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