* [PATCH] perf/x86/intel/uncore: Add Node ID mask
@ 2019-01-27 14:53 kan.liang
2019-01-29 7:10 ` Song Liu
2019-02-04 8:48 ` [tip:perf/core] " tip-bot for Kan Liang
0 siblings, 2 replies; 3+ messages in thread
From: kan.liang @ 2019-01-27 14:53 UTC (permalink / raw)
To: tglx, peterz, mingo, linux-kernel; +Cc: ak, songliubraving, Kan Liang, stable
From: Kan Liang <kan.liang@linux.intel.com>
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@fb.com>
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: stable@vger.kernel.org
---
arch/x86/events/intel/uncore_snbep.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index c07bee3..b10e043 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -1222,6 +1222,8 @@ 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
*/
@@ -1243,7 +1245,7 @@ static int snbep_pci2phy_map_init(int devid, int nodeid_loc, int idmap_loc, bool
err = pci_read_config_dword(ubox_dev, nodeid_loc, &config);
if (err)
break;
- nodeid = config;
+ nodeid = config & NODE_ID_MASK;
/* get the Node ID mapping */
err = pci_read_config_dword(ubox_dev, idmap_loc, &config);
if (err)
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] perf/x86/intel/uncore: Add Node ID mask
2019-01-27 14:53 [PATCH] perf/x86/intel/uncore: Add Node ID mask kan.liang
@ 2019-01-29 7:10 ` Song Liu
2019-02-04 8:48 ` [tip:perf/core] " tip-bot for Kan Liang
1 sibling, 0 replies; 3+ messages in thread
From: Song Liu @ 2019-01-29 7:10 UTC (permalink / raw)
To: kan.liang; +Cc: Thomas Gleixner, peterz, mingo, linux-kernel, ak, stable
> On Jan 27, 2019, at 6:53 AM, kan.liang@linux.intel.com wrote:
>
> From: Kan Liang <kan.liang@linux.intel.com>
>
> 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@fb.com>
> Tested-by: Song Liu <songliubraving@fb.com>
> Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
> Cc: stable@vger.kernel.org
Thanks Kan!
Acked-by: Song Liu <songliubraving@fb.com>
> ---
> arch/x86/events/intel/uncore_snbep.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
> index c07bee3..b10e043 100644
> --- a/arch/x86/events/intel/uncore_snbep.c
> +++ b/arch/x86/events/intel/uncore_snbep.c
> @@ -1222,6 +1222,8 @@ 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
> */
> @@ -1243,7 +1245,7 @@ static int snbep_pci2phy_map_init(int devid, int nodeid_loc, int idmap_loc, bool
> err = pci_read_config_dword(ubox_dev, nodeid_loc, &config);
> if (err)
> break;
> - nodeid = config;
> + nodeid = config & NODE_ID_MASK;
> /* get the Node ID mapping */
> err = pci_read_config_dword(ubox_dev, idmap_loc, &config);
> if (err)
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* [tip:perf/core] perf/x86/intel/uncore: Add Node ID mask
2019-01-27 14:53 [PATCH] perf/x86/intel/uncore: Add Node ID mask kan.liang
2019-01-29 7:10 ` Song Liu
@ 2019-02-04 8:48 ` tip-bot for Kan Liang
1 sibling, 0 replies; 3+ messages in thread
From: tip-bot for Kan Liang @ 2019-02-04 8:48 UTC (permalink / raw)
To: linux-tip-commits
Cc: peterz, torvalds, alexander.shishkin, mingo, jolsa,
songliubraving, hpa, acme, tglx, kan.liang, linux-kernel
Commit-ID: 9e63a7894fd302082cf3627fe90844421a6cbe7f
Gitweb: https://git.kernel.org/tip/9e63a7894fd302082cf3627fe90844421a6cbe7f
Author: Kan Liang <kan.liang@linux.intel.com>
AuthorDate: Sun, 27 Jan 2019 06:53:14 -0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 4 Feb 2019 08:44:43 +0100
perf/x86/intel/uncore: Add Node ID mask
Some PCI uncore PMUs cannot be registered on an 8-socket system (HPE
Superdome Flex).
To understand which Socket the PCI uncore PMUs belongs 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, an incorrect Node ID
will be fetched.
Filter the Node ID by adding a mask.
Reported-by: Song Liu <songliubraving@fb.com>
Tested-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <stable@vger.kernel.org> # v3.7+
Fixes: 7c94ee2e0917 ("perf/x86: Add Intel Nehalem and Sandy Bridge-EP uncore support")
Link: https://lkml.kernel.org/r/1548600794-33162-1-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/events/intel/uncore_snbep.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index c07bee31abe8..b10e04387f38 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -1222,6 +1222,8 @@ 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
*/
@@ -1243,7 +1245,7 @@ static int snbep_pci2phy_map_init(int devid, int nodeid_loc, int idmap_loc, bool
err = pci_read_config_dword(ubox_dev, nodeid_loc, &config);
if (err)
break;
- nodeid = config;
+ nodeid = config & NODE_ID_MASK;
/* get the Node ID mapping */
err = pci_read_config_dword(ubox_dev, idmap_loc, &config);
if (err)
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2019-01-27 14:53 [PATCH] perf/x86/intel/uncore: Add Node ID mask kan.liang
2019-01-29 7:10 ` Song Liu
2019-02-04 8:48 ` [tip:perf/core] " tip-bot for Kan Liang
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