linux/tools/arch/powerpc/include, branch v5.1

tools headers uapi: Sync powerpc's asm/kvm.h copy with the kernel sources

2019-03-28T17:41:21Z

To pick up the changes in: 2b57ecd0208f ("KVM: PPC: Book3S: Add count cache flush parameters to kvmppc_get_cpu_char()") That don't cause any changes in the tools. This silences this perf build warning: Warning: Kernel ABI header at 'tools/arch/powerpc/include/uapi/asm/kvm.h' differs from latest version at 'arch/powerpc/include/uapi/asm/kvm.h' diff -u tools/arch/powerpc/include/uapi/asm/kvm.h arch/powerpc/include/uapi/asm/kvm.h Cc: Adrian Hunter Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Suraj Jitindar Singh Link: https://lkml.kernel.org/n/tip-4pb7ywp9536hub2pnj4hu6i4@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

Merge tag 'powerpc-5.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2019-01-18T17:55:42Z

Pull powerpc fixes from Michael Ellerman: "A couple of weeks of fixes. There's one fix for an oops on Power9 machines with Open CAPI adapters. And a fix for probable memory corruption in some of the new NPU code, caught by smatch though and not seen in the wild. Plus a few other minor fixes. There's one non-fix which is the perf_regs change. That was sent during the merge window but I accidentally only merged the first of two patches in the series. It's been in linux-next so hopefully doesn't conflict with anything in acme's tree. Thanks to: Alexey Kardashevskiy, Andrew Donnellan, Breno Leitao, Christian Lamparter, Christophe Leroy, Dan Carpenter, Frederic Barrat, Greg Kurz, Jason A. Donenfeld, Madhavan Srinivasan" * tag 'powerpc-5.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: powerpc/syscalls: Fix syscall tracing powerpc/pseries: Fix build break due to pnv_npu2_init() powerpc/4xx/ocm: Fix fix for phys_addr_t printf warnings powerpc/powernv/npu: Fix oops in pnv_try_setup_npu_table_group() powerpc/tm: Limit TM code inside PPC_TRANSACTIONAL_MEM powerpc/8xx: fix setting of pagetable for Abatron BDI debug tool. powerpc/powernv/npu: Allocate enough memory in pnv_try_setup_npu_table_group() powerpc/perf: Update perf_regs structure to include MMCRA

tools headers powerpc: Remove unistd.h

2019-01-10T13:42:08Z

We use syscall.tbl to generate system call table on powerpc. The unistd.h copy is no longer required now. Remove it. Signed-off-by: Ravi Bangoria Cc: Jiri Olsa Cc: Michael Ellerman Cc: Namhyung Kim Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/20190110094936.3132-2-ravi.bangoria@linux.ibm.com Signed-off-by: Arnaldo Carvalho de Melo

powerpc/perf: Update perf_regs structure to include MMCRA

2019-01-08T08:22:47Z

On each sample, Monitor Mode Control Register A (MMCRA) content is saved in pt_regs. MMCRA does not have a entry as-is in the pt_regs but instead, MMCRA content is saved in the "dsisr" register of pt_regs. Patch adds another entry to the perf_regs structure to include the "MMCRA" printing which internally maps to the "dsisr" of pt_regs. It also check for the MMCRA availability in the platform and present value accordingly mpe: This was the 2nd patch in a series with commit 333804dc3b7a ("powerpc/perf: Update perf_regs structure to include SIER") but I accidentally only merged the 1st patch, so merge this one now. Signed-off-by: Madhavan Srinivasan Signed-off-by: Michael Ellerman

powerpc/perf: Update perf_regs structure to include SIER

2018-12-20T09:53:11Z

On each sample, Sample Instruction Event Register (SIER) content is saved in pt_regs. SIER does not have a entry as-is in the pt_regs but instead, SIER content is saved in the "dar" register of pt_regs. Patch adds another entry to the perf_regs structure to include the "SIER" printing which internally maps to the "dar" of pt_regs. It also check for the SIER availability in the platform and present value accordingly Signed-off-by: Madhavan Srinivasan Signed-off-by: Michael Ellerman

tools headers: Sync the various kvm.h header copies

2018-10-31T12:57:53Z

For powerpc, s390, x86 and the main uapi linux/kvm.h header, none of them entail changes in tooling. Cc: Jiri Olsa Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-avn7iy8f4tcm2y40sbsdk31m@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

tools, perf: add and use optimized ring_buffer_{read_head, write_tail} helpers

2018-10-19T20:43:08Z

Currently, on x86-64, perf uses LFENCE and MFENCE (rmb() and mb(), respectively) when processing events from the perf ring buffer which is unnecessarily expensive as we can do more lightweight in particular given this is critical fast-path in perf. According to Peter rmb()/mb() were added back then via a94d342b9cb0 ("tools/perf: Add required memory barriers") at a time where kernel still supported chips that needed it, but nowadays support for these has been ditched completely, therefore we can fix them up as well. While for x86-64, replacing rmb() and mb() with smp_*() variants would result in just a compiler barrier for the former and LOCK + ADD for the latter (__sync_synchronize() uses slower MFENCE by the way), Peter suggested we can use smp_{load_acquire,store_release}() instead for architectures where its implementation doesn't resolve in slower smp_mb(). Thus, e.g. in x86-64 we would be able to avoid CPU barrier entirely due to TSO. For architectures where the latter needs to use smp_mb() e.g. on arm, we stick to cheaper smp_rmb() variant for fetching the head. This work adds helpers ring_buffer_read_head() and ring_buffer_write_tail() for tools infrastructure that either switches to smp_load_acquire() for architectures where it is cheaper or uses READ_ONCE() + smp_rmb() barrier for those where it's not in order to fetch the data_head from the perf control page, and it uses smp_store_release() to write the data_tail. Latter is smp_mb() + WRITE_ONCE() combination or a cheaper variant if architecture allows for it. Those that rely on smp_rmb() and smp_mb() can further improve performance in a follow up step by implementing the two under tools/arch/*/include/asm/barrier.h such that they don't have to fallback to rmb() and mb() in tools/include/asm/barrier.h. Switch perf to use ring_buffer_read_head() and ring_buffer_write_tail() so it can make use of the optimizations. Later, we convert libbpf as well to use the same helpers. Side note [0]: the topic has been raised of whether one could simply use the C11 gcc builtins [1] for the smp_load_acquire() and smp_store_release() instead: __atomic_load_n(ptr, __ATOMIC_ACQUIRE); __atomic_store_n(ptr, val, __ATOMIC_RELEASE); Kernel and (presumably) tooling shipped along with the kernel has a minimum requirement of being able to build with gcc-4.6 and the latter does not have C11 builtins. While generally the C11 memory models don't align with the kernel's, the C11 load-acquire and store-release alone /could/ suffice, however. Issue is that this is implementation dependent on how the load-acquire and store-release is done by the compiler and the mapping of supported compilers must align to be compatible with the kernel's implementation, and thus needs to be verified/tracked on a case by case basis whether they match (unless an architecture uses them also from kernel side). The implementations for smp_load_acquire() and smp_store_release() in this patch have been adapted from the kernel side ones to have a concrete and compatible mapping in place. [0] http://patchwork.ozlabs.org/patch/985422/ [1] https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html Signed-off-by: Daniel Borkmann Acked-by: Peter Zijlstra (Intel) Cc: "Paul E. McKenney" Cc: Will Deacon Cc: Arnaldo Carvalho de Melo Signed-off-by: Alexei Starovoitov

tools headers powerpc: Update asm/unistd.h copy to pick new

2018-07-30T14:51:13Z

The new 'io_pgetevents' syscall was wired up in PowerPC in the following cset: b2f82565f2ca ("powerpc: Wire up io_pgetevents") Update tools/arch/powerpc/ copy of the asm/unistd.h file so that 'perf trace' on PowerPC gets it in its syscall table. This elliminated the following perf build warning: Warning: Kernel ABI header at 'tools/arch/powerpc/include/uapi/asm/unistd.h' differs from latest version at 'arch/powerpc/include/uapi/asm/unistd.h' Cc: Alexander Shishkin Cc: Breno Leitao Cc: Hendrik Brueckner Cc: Jiri Olsa Cc: linuxppc-dev@lists.ozlabs.org Cc: Michael Ellerman Cc: Namhyung Kim Cc: Ravi Bangoria Cc: Thomas Richter Link: https://lkml.kernel.org/n/tip-9uvu7tz4ud3bxxfyxwryuz47@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo

tools/headers: Pick up latest kernel ABIs

2018-06-26T06:43:14Z

Sync KVM ABI additions and x86 CPU features additions - neither of which has any impact on the tooling build. Cc: Arnaldo Carvalho de Melo Cc: Peter Zijlstra Cc: Namhyung Kim Cc: Jiri Olsa Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar

tools include powerpc: Update arch/powerpc/include/uapi/asm/unistd.h copy to get 'rseq' syscall

2018-06-25T14:59:36Z

This updates the tools/perf/ copy of the powerpc file used to generate the syscall table file used to make 'perf trace' become aware of the new 'rseq' syscall, no matter in which system it gets built, i.e. older systems where the syscalls are not available in the running kernel (via tracefs) or in the system headers will still be aware of these syscalls/. From this commit: bb862b021d75 ("powerpc: Wire up restartable sequences system call") Silencing this tools/perf build warning: Warning: Kernel ABI header at 'tools/arch/powerpc/include/uapi/asm/unistd.h' differs from latest version at 'arch/powerpc/include/uapi/asm/unistd.h' Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Boqun Feng Cc: David Ahern Cc: Hendrik Brueckner Cc: Jiri Olsa Cc: Mathieu Desnoyers Cc: Michael Ellerman Cc: Namhyung Kim Cc: Ravi Bangoria Cc: Thomas Gleixner Cc: Thomas Richter Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-adtgz6u3apd76tghiu9w0k19@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo