On 1/28/2019 7:35 PM, Sasha Levin wrote:
Hi,
[This is an automated email]
This commit has been processed because it contains a "Fixes:" tag,
fixing commit: 7c94ee2e0917 perf/x86: Add Intel Nehalem and Sandy Bridge-EP uncore support.
The bot has tested the following trees: v4.20.5, v4.19.18, v4.14.96, v4.9.153, v4.4.172, v3.18.133.
v4.20.5: Build OK!
v4.19.18: Build OK!
v4.14.96: Build OK!
v4.9.153: Build OK!
v4.4.172: Failed to apply! Possible dependencies:
Unable to calculate
v3.18.133: Failed to apply! Possible dependencies:
Unable to calculate
How should we proceed with this patch?
Here is the backport patch for 4.4 and 3.18.
From 21eb165d645a48fb31efed75902f892986449bb0 Mon Sep 17 00:00:00 2001
From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Date: Tue, 29 Jan 2019 08:35:03 -0800
Subject: [PATCH] perf/x86/intel/uncore: Add Node ID mask
Some PCI uncore PMUs cannot be registered on a 8-socket system (HPE
Superdome Flex).
To understand which Socket the PCI uncore PMUs belong to, perf retrieves
the local Node ID of the uncore device from CPUNODEID(0xC0) of the PCI
configuration space, and the mapping between Socket ID and Node ID from
GIDNIDMAP(0xD4). The Socket ID can be calculated accordingly.
The local Node ID is only available at bit 2:0, but current code doesn't
mask it. If a BIOS doesn't clear the rest of the bits, a wrong Node ID
will be fetched.
Filter the Node ID by adding a mask.
Fixes: 7c94ee2e0917 ("perf/x86: Add Intel Nehalem and Sandy Bridge-EP
uncore support")
Reported-by: Song Liu <songliubraving@xxxxxx>
Tested-by: Song Liu <songliubraving@xxxxxx>
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Acked-by: Song Liu <songliubraving@xxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c
b/arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c
index f0f4fcb..9475794 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c
@@ -1081,6 +1081,8 @@ static struct pci_driver snbep_uncore_pci_driver = {
.id_table = snbep_uncore_pci_ids,
};
+#define NODE_ID_MASK 0x7
+
/*
* build pci bus to socket mapping
*/
@@ -1102,7 +1104,7 @@ static int snbep_pci2phy_map_init(int devid)
err = pci_read_config_dword(ubox_dev, 0x40, &config);
if (err)
break;
- nodeid = config;
+ nodeid = config & NODE_ID_MASK;
/* get the Node ID mapping */
err = pci_read_config_dword(ubox_dev, 0x54, &config);
if (err)
--
2.7.4
