linux-kernel - [PATCH 4/4] perf/x86/intel/uncore: Use D0:F0 as a default device

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Date: Thu,  4 Apr 2024 07:17:06 -0700
From: kan.liang@...ux.intel.com
To: peterz@...radead.org,
	mingo@...hat.com,
	acme@...nel.org,
	namhyung@...nel.org,
	irogers@...gle.com,
	adrian.hunter@...el.com,
	alexander.shishkin@...ux.intel.com,
	linux-kernel@...r.kernel.org
Cc: ak@...ux.intel.com,
	Zhenyu Wang <zhenyuw@...ux.intel.com>,
	Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 4/4] perf/x86/intel/uncore: Use D0:F0 as a default device

From: Zhenyu Wang <zhenyuw@...ux.intel.com>

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: Kan Liang <kan.liang@...ux.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 4cab1bf57602..8625d6d279c3 100644
--- a/arch/x86/events/intel/uncore_snb.c
+++ b/arch/x86/events/intel/uncore_snb.c
@@ -1488,6 +1488,10 @@ 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;
 }
 
-- 
2.35.1