linux-kernel - [tip: perf/core] perf/x86/intel/uncore: Use D0:F0 as a default device

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Message-ID: <172302789705.2215.10644876568703251327.tip-bot2@tip-bot2>
Date: Wed, 07 Aug 2024 10:51:37 -0000
From: "tip-bot2 for Zhenyu Wang" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Zhenyu Wang <zhenyuw@...ux.intel.com>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Kan Liang <kan.liang@...ux.intel.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf/x86/intel/uncore: Use D0:F0 as a default device

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     aaad0e2aa50723969f96b690f72e2f4aefa433f2
Gitweb:        https://git.kernel.org/tip/aaad0e2aa50723969f96b690f72e2f4aefa433f2
Author:        Zhenyu Wang <zhenyuw@...ux.intel.com>
AuthorDate:    Wed, 31 Jul 2024 07:13:53 -07:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 05 Aug 2024 16:54:46 +02:00

perf/x86/intel/uncore: Use D0:F0 as a default device

Some uncore PMON registers are located in the MMIO space of the Host
Bridge and DRAM Controller device, which is located at D0:F0 for
Tiger Lake and later client generation.

Use D0:F0 as a default device. So it doesn't need to keep adding the
complete Device ID list for each generation anymore.

Signed-off-by: Zhenyu Wang <zhenyuw@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
Link: https://lore.kernel.org/r/20240731141353.759643-5-kan.liang@linux.intel.com
---
 arch/x86/events/intel/uncore_snb.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/events/intel/uncore_snb.c b/arch/x86/events/intel/uncore_snb.c
index f7402bd..3934e1e 100644
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -1504,6 +1504,10 @@ static struct pci_dev *tgl_uncore_get_mc_dev(void)
 		ids++;
 	}
 
+	/* Just try to grab 00:00.0 device */
+	if (!mc_dev)
+		mc_dev = pci_get_domain_bus_and_slot(0, 0, PCI_DEVFN(0, 0));
+
 	return mc_dev;
 }