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oprofile, x86: Check IBS capability bits 1 and 2 

There are IBS CPUID feature flags in CPUID Fn8000_001B to detect if
the cpu supports IBS fetch sampling (FetchSam) and/or IBS execution
sampling (OpSam). This patch adds checks if the both features are
available.

Spec:

 http://support.amd.com/us/Processor_TechDocs/31116.pdf

Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2010-09-21 15:58:32 +02:00
parent e63414740e
commit 4ac945f002
1 changed files with 37 additions and 20 deletions
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57
arch/x86/oprofile/op_model_amd.c
View File

@ -70,9 +70,22 @@ static u64 ibs_op_ctl;
* Same bit mask as for IBS cpuid feature flags (Fn8000_001B_EAX), but
* bit 0 is used to indicate the existence of IBS.
*/
#define IBS_CAPS_AVAIL (1LL<<0)
#define IBS_CAPS_RDWROPCNT (1LL<<3)
#define IBS_CAPS_OPCNT (1LL<<4)
#define IBS_CAPS_AVAIL (1U<<0)
#define IBS_CAPS_FETCHSAM (1U<<1)
#define IBS_CAPS_OPSAM (1U<<2)
#define IBS_CAPS_RDWROPCNT (1U<<3)
#define IBS_CAPS_OPCNT (1U<<4)
#define IBS_CAPS_DEFAULT (IBS_CAPS_AVAIL \
| IBS_CAPS_FETCHSAM \
| IBS_CAPS_OPSAM)
/*
* IBS APIC setup
*/
#define IBSCTL 0x1cc
#define IBSCTL_LVT_OFFSET_VALID (1ULL<<8)
#define IBSCTL_LVT_OFFSET_MASK 0x0F
/*
* IBS randomization macros
@ -92,12 +105,12 @@ static u32 get_ibs_caps(void)
/* check IBS cpuid feature flags */
max_level = cpuid_eax(0x80000000);
if (max_level < IBS_CPUID_FEATURES)
return IBS_CAPS_AVAIL;
return IBS_CAPS_DEFAULT;
ibs_caps = cpuid_eax(IBS_CPUID_FEATURES);
if (!(ibs_caps & IBS_CAPS_AVAIL))
/* cpuid flags not valid */
return IBS_CAPS_AVAIL;
return IBS_CAPS_DEFAULT;
return ibs_caps;
}
@ -527,22 +540,26 @@ static int setup_ibs_files(struct super_block *sb, struct dentry *root)
ibs_config.op_enabled = 0;
ibs_config.dispatched_ops = 0;
dir = oprofilefs_mkdir(sb, root, "ibs_fetch");
oprofilefs_create_ulong(sb, dir, "enable",
&ibs_config.fetch_enabled);
oprofilefs_create_ulong(sb, dir, "max_count",
&ibs_config.max_cnt_fetch);
oprofilefs_create_ulong(sb, dir, "rand_enable",
&ibs_config.rand_en);
if (ibs_caps & IBS_CAPS_FETCHSAM) {
dir = oprofilefs_mkdir(sb, root, "ibs_fetch");
oprofilefs_create_ulong(sb, dir, "enable",
&ibs_config.fetch_enabled);
oprofilefs_create_ulong(sb, dir, "max_count",
&ibs_config.max_cnt_fetch);
oprofilefs_create_ulong(sb, dir, "rand_enable",
&ibs_config.rand_en);
}
dir = oprofilefs_mkdir(sb, root, "ibs_op");
oprofilefs_create_ulong(sb, dir, "enable",
&ibs_config.op_enabled);
oprofilefs_create_ulong(sb, dir, "max_count",
&ibs_config.max_cnt_op);
if (ibs_caps & IBS_CAPS_OPCNT)
oprofilefs_create_ulong(sb, dir, "dispatched_ops",
&ibs_config.dispatched_ops);
if (ibs_caps & IBS_CAPS_OPSAM) {
dir = oprofilefs_mkdir(sb, root, "ibs_op");
oprofilefs_create_ulong(sb, dir, "enable",
&ibs_config.op_enabled);
oprofilefs_create_ulong(sb, dir, "max_count",
&ibs_config.max_cnt_op);
if (ibs_caps & IBS_CAPS_OPCNT)
oprofilefs_create_ulong(sb, dir, "dispatched_ops",
&ibs_config.dispatched_ops);
}
return 0;
}