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Date: Mon, 19 Apr 2010 18:04:39 +0200
From: Robert Richter <robert.richter@....com>
To: Peter Zijlstra <peterz@...radead.org>
CC: Ingo Molnar <mingo@...e.hu>, Stephane Eranian <eranian@...gle.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/12] perf, x86: setup NMI handler for IBS
On 15.04.10 15:11:30, Robert Richter wrote:
> On 15.04.10 14:57:35, Peter Zijlstra wrote:
> > > +/* uninitialize the APIC for the IBS interrupts if needed */
> > > +static void clear_ibs_nmi(void)
> > > +{
> > > + on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1);
> > > +}
> >
> >
> > That on_each_cpu() looks wonky, why isn't this in the hotplug hooks?
>
> Right, it should be there. Will update this patch.
Peter,
please see my updated version below.
-Robert
---
>From bcb2c4aec6bf09fc7c05f31dde9dacd57b9c679c Mon Sep 17 00:00:00 2001
From: Robert Richter <robert.richter@....com>
Date: Mon, 19 Apr 2010 15:32:37 +0200
Subject: [PATCH] perf, x86: setup NMI handler for IBS
This implements the perf nmi handler for ibs interrupts. The code was
copied from oprofile and should be merged somewhen.
Signed-off-by: Robert Richter <robert.richter@....com>
---
arch/x86/kernel/cpu/perf_event.c | 5 ++
arch/x86/kernel/cpu/perf_event_amd.c | 85 ++++++++++++++++++++++++++++++++++
2 files changed, 90 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 940107f..0ad8c45 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -516,6 +516,8 @@ static int x86_pmu_hw_config(struct perf_event *event)
return x86_setup_perfctr(event);
}
+static inline void init_ibs_nmi(void);
+
/*
* Setup the hardware configuration for a given attr_type
*/
@@ -537,6 +539,8 @@ static int __hw_perf_event_init(struct perf_event *event)
if (err)
release_pmc_hardware();
}
+ if (!err)
+ init_ibs_nmi();
}
if (!err)
atomic_inc(&active_events);
@@ -1381,6 +1385,7 @@ static void __init pmu_check_apic(void)
return;
x86_pmu.apic = 0;
+ x86_pmu.ibs = 0;
pr_info("no APIC, boot with the \"lapic\" boot parameter to force-enable it.\n");
pr_info("no hardware sampling interrupt available.\n");
}
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index 246304d..a6ce6f8 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -1,5 +1,7 @@
#ifdef CONFIG_CPU_SUP_AMD
+#include <linux/pci.h>
+
static DEFINE_RAW_SPINLOCK(amd_nb_lock);
static __initconst const u64 amd_hw_cache_event_ids
@@ -106,6 +108,85 @@ static const u64 amd_perfmon_event_map[] =
[PERF_COUNT_HW_BRANCH_MISSES] = 0x00c5,
};
+#ifdef CONFIG_X86_LOCAL_APIC
+
+/* IBS - apic initialization, taken from oprofile, should be unified */
+
+/*
+ * Currently there is no early pci ecs access implemented, so this
+ * can't be put into amd_pmu_init(). For now we initialize it in
+ * __hw_perf_event_init().
+ */
+
+static int __init_ibs_nmi(void)
+{
+#define IBSCTL_LVTOFFSETVAL (1 << 8)
+#define IBSCTL 0x1cc
+ struct pci_dev *cpu_cfg;
+ int nodes;
+ u32 value = 0;
+ u8 ibs_eilvt_off;
+
+ if (!x86_pmu.ibs)
+ return 0;
+
+ ibs_eilvt_off = setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 0);
+
+ nodes = 0;
+ cpu_cfg = NULL;
+ do {
+ cpu_cfg = pci_get_device(PCI_VENDOR_ID_AMD,
+ PCI_DEVICE_ID_AMD_10H_NB_MISC,
+ cpu_cfg);
+ if (!cpu_cfg)
+ break;
+ ++nodes;
+ pci_write_config_dword(cpu_cfg, IBSCTL, ibs_eilvt_off
+ | IBSCTL_LVTOFFSETVAL);
+ pci_read_config_dword(cpu_cfg, IBSCTL, &value);
+ if (value != (ibs_eilvt_off | IBSCTL_LVTOFFSETVAL)) {
+ pci_dev_put(cpu_cfg);
+ printk(KERN_DEBUG "Failed to setup IBS LVT offset, "
+ "IBSCTL = 0x%08x", value);
+ return 1;
+ }
+ } while (1);
+
+ if (!nodes) {
+ printk(KERN_DEBUG "No CPU node configured for IBS");
+ return 1;
+ }
+
+ return 0;
+}
+
+static inline void init_ibs_nmi(void)
+{
+ if (__init_ibs_nmi())
+ /* something went wrong, disable ibs */
+ x86_pmu.ibs = 0;
+}
+
+static inline void apic_init_ibs(void)
+{
+ if (x86_pmu.ibs)
+ setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_NMI, 0);
+}
+
+static inline void apic_clear_ibs(void)
+{
+ if (x86_pmu.ibs)
+ setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 1);
+}
+
+#else
+
+static inline void init_ibs_nmi(void) { }
+static inline void apic_init_ibs(void) { }
+static inline void apic_clear_ibs(void) { }
+
+#endif
+
static u64 amd_pmu_event_map(int hw_event)
{
return amd_perfmon_event_map[hw_event];
@@ -343,6 +424,8 @@ static void amd_pmu_cpu_starting(int cpu)
cpuc->amd_nb->refcnt++;
raw_spin_unlock(&amd_nb_lock);
+
+ apic_init_ibs();
}
static void amd_pmu_cpu_dead(int cpu)
@@ -366,6 +449,8 @@ static void amd_pmu_cpu_dead(int cpu)
}
raw_spin_unlock(&amd_nb_lock);
+
+ apic_clear_ibs();
}
static __initconst const struct x86_pmu amd_pmu = {
--
1.7.0.3
--
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter@....com
--
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