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Mon, 09 Nov 2026 17:47:15 -0800 (PST) Received: from localhost ([2600:1702:7a90:6f9f:8bc4:8aec:108d:7a04]) by smtp.gmail.com with ESMTPSA id 00721157ae682-8b3933e0d01sm8429667b3.22.2026.11.09.17.47.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 17:47:14 -0800 (PST) From: Matt Turner Date: Mon, 09 Nov 2026 20:47:05 -0500 Subject: [PATCH 6/8] powerpc/perf: mpc7450: Export the event format in sysfs X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261109-ppc32-perf-v1-6-a6e8a55b3b48@gmail.com> References: <20261109-ppc32-perf-v1-0-a6e8a55b3b48@gmail.com> In-Reply-To: <20261109-ppc32-perf-v1-0-a6e8a55b3b48@gmail.com> To: Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , "Ritesh Harjani (IBM)" , Shrikanth Hegde , Paul Mackerras Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Matt Turner X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1914; i=mattst88@gmail.com; h=from:subject:message-id; bh=L7btMy1nXBY1bg9NMBkHPlpV09dJ8lMXLGy4hYCTfyY=; b=owGbwMvMwCW25rVmCc8sv+mMp9WSGLI+lU+5d/ne7k/x6j5Z3dE75bjXuh0Jeuf/1l2q4r6Wi sz3aZlRHR9ZGMS4GGaKKbLErVdkmdW2Y6nPaelfMHNYmUCGSIs0MAABCwNfbmJeqZGOkZ6ptqGe IZChYxQPkdNj0MgsLi5NLdJNKyhyyMsvSSzJzM8r1ssvSM0rSC/QS8tMK8nIyC8qTgUaoZeXWmL q6uhmZGhgYuloYeZk4Whq4uzsZOjk5ujo7OpkZGluYuBs6WjiamnOwMUpAHPNewVGht49aXyL+8 2uxjx+vydBfe7Rr9FTzm3kOX4x8YhESdviaTcZ/unYL77gpHX9v/DLyNqD9Vt49n9TMrgmu21rj n2p0ZKfN7gB X-Developer-Key: i=mattst88@gmail.com; a=openpgp; fpr=3BB639E56F861FA2E86505690FDD682D974CA72A The MPC7450 PMU has no format/ directory, so perf can take its events only as raw codes, and cannot set the threshold by name. Describe the fields of the event code: the PMC select (bits 0-6), the PMC (bits 8-10), the threshold (bits 12-17) and the threshold multiplier (bit 18). A threshold event can then be written as, e.g., cpu/event=0x12b,thresh=20/. Signed-off-by: Matt Turner --- arch/powerpc/perf/mpc7450-pmu.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/arch/powerpc/perf/mpc7450-pmu.c b/arch/powerpc/perf/mpc7450-pmu.c index b2fe977cea16..9bed5c238f45 100644 --- a/arch/powerpc/perf/mpc7450-pmu.c +++ b/arch/powerpc/perf/mpc7450-pmu.c @@ -398,6 +398,31 @@ static u64 mpc7450_cache_events[C(MAX)][C(OP_MAX)][C(RESULT_MAX)] = { }, }; +PMU_FORMAT_ATTR(event, "config:0-18"); +PMU_FORMAT_ATTR(pmcsel, "config:0-6"); +PMU_FORMAT_ATTR(pmc, "config:8-10"); +PMU_FORMAT_ATTR(thresh, "config:12-17"); +PMU_FORMAT_ATTR(thresh_mult, "config:18"); + +static struct attribute *mpc7450_pmu_format_attr[] = { + &format_attr_event.attr, + &format_attr_pmcsel.attr, + &format_attr_pmc.attr, + &format_attr_thresh.attr, + &format_attr_thresh_mult.attr, + NULL, +}; + +static const struct attribute_group mpc7450_pmu_format_group = { + .name = "format", + .attrs = mpc7450_pmu_format_attr, +}; + +static const struct attribute_group *mpc7450_pmu_attr_groups[] = { + &mpc7450_pmu_format_group, + NULL, +}; + struct power_pmu mpc7450_pmu = { .name = "MPC7450 family", .n_counter = N_COUNTER, @@ -411,6 +436,7 @@ struct power_pmu mpc7450_pmu = { .n_generic = ARRAY_SIZE(mpc7450_generic_events), .generic_events = mpc7450_generic_events, .cache_events = &mpc7450_cache_events, + .attr_groups = mpc7450_pmu_attr_groups, }; static int __init init_mpc7450_pmu(void) -- 2.55.0