From: Rob Herring <robh@kernel.org> To: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, Jiri Olsa <jolsa@redhat.com>, Mark Rutland <mark.rutland@arm.com>, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>, Zachary.Leaf@arm.com, Raphael Gault <raphael.gault@arm.com>, Jonathan Cameron <Jonathan.Cameron@huawei.com>, Namhyung Kim <namhyung@kernel.org>, Itaru Kitayama <itaru.kitayama@gmail.com>, linux-arm-kernel <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCH v7 0/9] arm64 userspace counter access support Date: Mon, 3 May 2021 09:56:37 -0500 [thread overview] Message-ID: <CAL_JsqJuG+rz6bfnsYAW3fQKq28d_38Qihrb72zB_20L4=gDMg@mail.gmail.com> (raw) In-Reply-To: <YIxTfKh6/uxvd0Fu@kernel.org> On Fri, Apr 30, 2021 at 1:59 PM Arnaldo Carvalho de Melo <acme@kernel.org> wrote: > > Em Mon, Apr 19, 2021 at 10:15:02PM -0500, Rob Herring escreveu: > > Hi all, > > > > Another version of arm64 userspace counter access support. I sent out > > the libperf bits separately and those are now applied (Thanks!), so this > > is just the arm64 bits. > > > > > > This originally resurrected Raphael's series[1] to enable userspace counter > > access on arm64. My previous versions are here[2][3][4][5][6][7]. A git > > branch is here[8]. > > Rob, please don't mix kernel patches with tools patches. The kernel > bits, if arch specific should go via the arch maintainer, core stuff to > PeterZ/Ingo/bpetkov/tglx, and tooling stuff I'll collect. Okay, perhaps MAINTAINERS should be updated to reflect that better. > > We did it on purpose to avoid any semblance of kernel/tool lockstep. > > The kernel changes should not prevent the tooling from working and the > tooling changes shouldn't require the kernel changes. > > Preexisting kernels should work with new tools and vice versa. The only issue I see here is the userspace access tests will fail if enabled in libperf for an arch but run on an older kernel without userspace access support. I could instead skip tests if cap_user_rdpmc is not set, but then how to test that it is set when it should be? I suppose checking sysfs 'rdpmc' is one option assuming we end up with the same file on Arm. Rob
WARNING: multiple messages have this Message-ID (diff)
From: Rob Herring <robh@kernel.org> To: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Will Deacon <will@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@redhat.com>, Jiri Olsa <jolsa@redhat.com>, Mark Rutland <mark.rutland@arm.com>, Alexander Shishkin <alexander.shishkin@linux.intel.com>, Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>, Zachary.Leaf@arm.com, Raphael Gault <raphael.gault@arm.com>, Jonathan Cameron <Jonathan.Cameron@huawei.com>, Namhyung Kim <namhyung@kernel.org>, Itaru Kitayama <itaru.kitayama@gmail.com>, linux-arm-kernel <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org> Subject: Re: [PATCH v7 0/9] arm64 userspace counter access support Date: Mon, 3 May 2021 09:56:37 -0500 [thread overview] Message-ID: <CAL_JsqJuG+rz6bfnsYAW3fQKq28d_38Qihrb72zB_20L4=gDMg@mail.gmail.com> (raw) In-Reply-To: <YIxTfKh6/uxvd0Fu@kernel.org> On Fri, Apr 30, 2021 at 1:59 PM Arnaldo Carvalho de Melo <acme@kernel.org> wrote: > > Em Mon, Apr 19, 2021 at 10:15:02PM -0500, Rob Herring escreveu: > > Hi all, > > > > Another version of arm64 userspace counter access support. I sent out > > the libperf bits separately and those are now applied (Thanks!), so this > > is just the arm64 bits. > > > > > > This originally resurrected Raphael's series[1] to enable userspace counter > > access on arm64. My previous versions are here[2][3][4][5][6][7]. A git > > branch is here[8]. > > Rob, please don't mix kernel patches with tools patches. The kernel > bits, if arch specific should go via the arch maintainer, core stuff to > PeterZ/Ingo/bpetkov/tglx, and tooling stuff I'll collect. Okay, perhaps MAINTAINERS should be updated to reflect that better. > > We did it on purpose to avoid any semblance of kernel/tool lockstep. > > The kernel changes should not prevent the tooling from working and the > tooling changes shouldn't require the kernel changes. > > Preexisting kernels should work with new tools and vice versa. The only issue I see here is the userspace access tests will fail if enabled in libperf for an arch but run on an older kernel without userspace access support. I could instead skip tests if cap_user_rdpmc is not set, but then how to test that it is set when it should be? I suppose checking sysfs 'rdpmc' is one option assuming we end up with the same file on Arm. Rob _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-05-03 14:56 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-20 3:15 [PATCH v7 0/9] arm64 userspace counter access support Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 1/9] arm64: Restrict undef hook for cpufeature registers Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 2/9] arm64: pmu: Add function implementation to update event index in userpage Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 3/9] arm64: perf: Enable PMU counter direct access for perf event Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 4/9] drivers/perf: arm_pmu: Export the per_cpu cpu_armpmu Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 5/9] arm64: perf: Add userspace counter access disable switch Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 6/9] libperf: Add arm64 support to perf_mmap__read_self() Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 7/9] perf: arm64: Add test for userspace counter access on heterogeneous systems Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-30 16:46 ` Masayoshi Mizuma 2021-04-30 16:46 ` Masayoshi Mizuma 2021-04-30 18:17 ` Rob Herring 2021-04-30 18:17 ` Rob Herring 2021-04-30 18:20 ` Rob Herring 2021-04-30 18:20 ` Rob Herring 2021-04-30 20:16 ` Masayoshi Mizuma 2021-04-30 20:16 ` Masayoshi Mizuma 2021-05-13 9:05 ` nakamura.shun 2021-05-13 9:05 ` nakamura.shun 2021-05-13 12:37 ` Rob Herring 2021-05-13 12:37 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 8/9] perf: arm64: Add tests for 32-bit and 64-bit counter size userspace access Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-20 3:15 ` [PATCH v7 9/9] Documentation: arm64: Document PMU counters access from userspace Rob Herring 2021-04-20 3:15 ` Rob Herring 2021-04-30 18:59 ` [PATCH v7 0/9] arm64 userspace counter access support Arnaldo Carvalho de Melo 2021-04-30 18:59 ` Arnaldo Carvalho de Melo 2021-05-03 14:56 ` Rob Herring [this message] 2021-05-03 14:56 ` Rob Herring
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