linux-kernel - [PATCH 13/32] perf/riscv: Assign parents for event

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Date:   Tue, 4 Apr 2023 14:42:06 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Will Deacon <will@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <gregkh@...uxfoundation.org>
CC:     <linuxarm@...wei.com>, Dan Williams <dan.j.williams@...el.com>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Jiucheng Xu <jiucheng.xu@...ogic.com>,
        Khuong Dinh <khuong@...amperecomputing.com>,
        Robert Richter <rric@...nel.org>,
        Atish Patra <atishp@...shpatra.org>,
        Anup Patel <anup@...infault.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Frank Li <Frank.li@....com>,
        Shuai Xue <xueshuai@...ux.alibaba.com>,
        Vineet Gupta <vgupta@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, Wu Hao <hao.wu@...el.com>,
        Tom Rix <trix@...hat.com>, <linux-fpga@...r.kernel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Liang Kan <kan.liang@...ux.intel.com>
Subject: [PATCH 13/32] perf/riscv: Assign parents for event_source devices

Currently all these devices appear directly under /sys/devices/
Only root busses should appear there, so instead assign the pmu->dev
parents to be the appropriate platform devices.

Link: https://lore.kernel.org/linux-cxl/ZCLI9A40PJsyqAmq@kroah.com/
Cc: Atish Patra <atishp@...shpatra.org>
CC: Anup Patel <anup@...infault.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

---

Untested.

This is minimal change, but could be made more elegant either by
making one of the existing initialization functions take a struct device *
or by embedding one in struct riscv_pmu
---
 drivers/perf/riscv_pmu_legacy.c | 1 +
 drivers/perf/riscv_pmu_sbi.c    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c
index ca9e20bfc7ac..8c4a0d915dc7 100644
--- a/drivers/perf/riscv_pmu_legacy.c
+++ b/drivers/perf/riscv_pmu_legacy.c
@@ -102,6 +102,7 @@ static int pmu_legacy_device_probe(struct platform_device *pdev)
 	pmu = riscv_pmu_alloc();
 	if (!pmu)
 		return -ENOMEM;
+	pmu->pmu.parent = &pdev->dev;
 	pmu_legacy_init(pmu);
 
 	return 0;
diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
index 70cb50fd41c2..f138fbc00a66 100644
--- a/drivers/perf/riscv_pmu_sbi.c
+++ b/drivers/perf/riscv_pmu_sbi.c
@@ -880,6 +880,7 @@ static int pmu_sbi_device_probe(struct platform_device *pdev)
 	}
 
 	pmu->pmu.attr_groups = riscv_pmu_attr_groups;
+	pmu->pmu.parent = &pdev->dev;
 	pmu->cmask = cmask;
 	pmu->ctr_start = pmu_sbi_ctr_start;
 	pmu->ctr_stop = pmu_sbi_ctr_stop;
-- 
2.37.2