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Date: Fri, 08 Feb 2008 15:02:57 -0500
From: "Barry Kasindorf" <barry.kasindorf@....com>
To: linux-kernel@...r.kernel.org
cc: barry.kasindorf@....com
Subject: [PATCH 1/3] AMD Family10h IBS support for oProfile driver
Signed-off-by: Barry Kasindorf <barry.kasindorf@....com>
Signed-off-by: Mark Langsdorf <mark.langsdorf@....com>
---
nmi_int.c | 43 +++++++++++++++++++++++++++++++++++++++++--
op_counter.h | 9 +++++++++
2 files changed, 50 insertions(+), 2 deletions(-)
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 9510b08..f47b614 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -31,6 +31,7 @@ static void nmi_stop(void);
/* 0 == registered but off, 1 == registered and on */
static int nmi_enabled = 0;
+int ibs_allowed; /* AMD Family 10h+ */
#ifdef CONFIG_PM
@@ -214,6 +215,11 @@ static int nmi_setup(void)
}
}
+
+ /*setup AMD Family10h IBS irq if needed */
+ if (ibs_allowed)
+ setup_ibs_nmi();
+
on_each_cpu(nmi_save_registers, NULL, 0, 1);
on_each_cpu(nmi_cpu_setup, NULL, 0, 1);
nmi_enabled = 1;
@@ -270,6 +276,10 @@ static void nmi_shutdown(void)
unregister_die_notifier(&profile_exceptions_nb);
model->shutdown(cpu_msrs);
free_msrs();
+
+ /*clear AMD Family 10h IBS irq if needed */
+ if (ibs_allowed)
+ clear_ibs_nmi();
}
static void nmi_cpu_start(void *dummy)
@@ -296,13 +306,15 @@ static void nmi_stop(void)
}
struct op_counter_config counter_config[OP_MAX_COUNTER];
+struct op_ibs_config ibs_config;
static int nmi_create_files(struct super_block *sb, struct dentry *root)
{
unsigned int i;
+ struct dentry *dir;
for (i = 0; i < model->num_counters; ++i) {
- struct dentry *dir;
+
char buf[4];
/* quick little hack to _not_ expose a counter if it is not
@@ -323,6 +335,31 @@ static int nmi_create_files(struct super_block *sb, struct dentry *root)
oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
}
+ /* Setup AMD Family 10h IBS control if needed */
+ if (ibs_allowed) {
+ char buf[12];
+
+ /* setup some reasonable defaults */
+ ibs_config.max_cnt_fetch = 250000;
+ ibs_config.FETCH_enabled = 0;
+ ibs_config.max_cnt_op = 250000;
+ ibs_config.OP_enabled = 0;
+ snprintf(buf, sizeof(buf), "ibs_fetch");
+ dir = oprofilefs_mkdir(sb, root, buf);
+ oprofilefs_create_ulong(sb, dir, "ran_enable",
+ &ibs_config.rand_en);
+ oprofilefs_create_ulong(sb, dir, "enable",
+ &ibs_config.FETCH_enabled);
+ oprofilefs_create_ulong(sb, dir, "max_count",
+ &ibs_config.max_cnt_fetch);
+ snprintf(buf, sizeof(buf), "ibs_uops");
+ dir = oprofilefs_mkdir(sb, root, buf);
+ oprofilefs_create_ulong(sb, dir, "enable",
+ &ibs_config.OP_enabled);
+ oprofilefs_create_ulong(sb, dir, "max_count",
+ &ibs_config.max_cnt_op);
+ }
+
return 0;
}
@@ -391,6 +428,7 @@ int __init op_nmi_init(struct oprofile_operations *ops)
__u8 vendor = boot_cpu_data.x86_vendor;
__u8 family = boot_cpu_data.x86;
char *cpu_type;
+ uint32_t eax, ebx, ecx, edx;
if (!cpu_has_apic)
return -ENODEV;
@@ -414,9 +452,17 @@ int __init op_nmi_init(struct oprofile_operations *ops)
break;
case 0x10:
model = &op_athlon_spec;
- cpu_type = "x86-64/family10";
+ cpu_type = "x86-64/family10h";
+ /* This CPU has IBS capability */
+ ibs_allowed = 1;
break;
}
+ /* see if IBS is available */
+ if (family >= 0x10) {
+ cpuid(0x80000001, &eax, &ebx, &ecx, &edx);
+ if (ecx & 0x40)
+ ibs_allowed = 1;
+ }
break;
case X86_VENDOR_INTEL:
diff --git a/arch/x86/oprofile/op_counter.h b/arch/x86/oprofile/op_counter.h
index 2880b15..5681445 100644
--- a/arch/x86/oprofile/op_counter.h
+++ b/arch/x86/oprofile/op_counter.h
@@ -26,4 +26,13 @@ struct op_counter_config {
extern struct op_counter_config counter_config[];
+struct op_ibs_config {
+ unsigned long OP_enabled;
+ unsigned long FETCH_enabled;
+ unsigned long max_cnt_fetch;
+ unsigned long max_cnt_op;
+ unsigned long rand_en;
+};
+
+extern struct op_ibs_config ibs_config;
#endif /* OP_COUNTER_H */
--
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