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authorRobert Richter <robert.richter@amd.com>2011-09-21 11:30:18 +0200
committerIngo Molnar <mingo@elte.hu>2011-10-10 06:57:16 +0200
commitb716916679e72054d436afadce2f94dcad71cfad (patch)
tree86e90ea74a78fb42276868c3ecd1af714d9e5b20 /arch/x86/oprofile
parentee5789dbcc800ba7d641443e53f60d53977f9747 (diff)
downloadop-kernel-dev-b716916679e72054d436afadce2f94dcad71cfad.zip
op-kernel-dev-b716916679e72054d436afadce2f94dcad71cfad.tar.gz
perf, x86: Implement IBS initialization
This patch implements IBS feature detection and initialzation. The code is shared between perf and oprofile. If IBS is available on the system for perf, a pmu is setup. Signed-off-by: Robert Richter <robert.richter@amd.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1316597423-25723-3-git-send-email-robert.richter@amd.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/oprofile')
-rw-r--r--arch/x86/oprofile/nmi_int.c2
-rw-r--r--arch/x86/oprofile/op_model_amd.c197
-rw-r--r--arch/x86/oprofile/op_x86_model.h1
3 files changed, 0 insertions, 200 deletions
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index adf8fb3..c04dc14 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -385,8 +385,6 @@ static void nmi_cpu_shutdown(void *dummy)
apic_write(APIC_LVTPC, per_cpu(saved_lvtpc, cpu));
apic_write(APIC_LVTERR, v);
nmi_cpu_restore_registers(msrs);
- if (model->cpu_down)
- model->cpu_down();
}
static void nmi_cpu_up(void *dummy)
diff --git a/arch/x86/oprofile/op_model_amd.c b/arch/x86/oprofile/op_model_amd.c
index e947e5c..303f086 100644
--- a/arch/x86/oprofile/op_model_amd.c
+++ b/arch/x86/oprofile/op_model_amd.c
@@ -74,27 +74,6 @@ static struct ibs_state ibs_state;
#define IBS_RANDOM_MASK ((1ULL << IBS_RANDOM_BITS) - 1)
#define IBS_RANDOM_MAXCNT_OFFSET (1ULL << (IBS_RANDOM_BITS - 5))
-static u32 get_ibs_caps(void)
-{
- u32 ibs_caps;
- unsigned int max_level;
-
- if (!boot_cpu_has(X86_FEATURE_IBS))
- return 0;
-
- /* check IBS cpuid feature flags */
- max_level = cpuid_eax(0x80000000);
- if (max_level < IBS_CPUID_FEATURES)
- return IBS_CAPS_DEFAULT;
-
- ibs_caps = cpuid_eax(IBS_CPUID_FEATURES);
- if (!(ibs_caps & IBS_CAPS_AVAIL))
- /* cpuid flags not valid */
- return IBS_CAPS_DEFAULT;
-
- return ibs_caps;
-}
-
/*
* 16-bit Linear Feedback Shift Register (LFSR)
*
@@ -285,81 +264,6 @@ static void op_amd_stop_ibs(void)
wrmsrl(MSR_AMD64_IBSOPCTL, 0);
}
-static inline int get_eilvt(int offset)
-{
- return !setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_NMI, 1);
-}
-
-static inline int put_eilvt(int offset)
-{
- return !setup_APIC_eilvt(offset, 0, 0, 1);
-}
-
-static inline int ibs_eilvt_valid(void)
-{
- int offset;
- u64 val;
- int valid = 0;
-
- preempt_disable();
-
- rdmsrl(MSR_AMD64_IBSCTL, val);
- offset = val & IBSCTL_LVT_OFFSET_MASK;
-
- if (!(val & IBSCTL_LVT_OFFSET_VALID)) {
- pr_err(FW_BUG "cpu %d, invalid IBS interrupt offset %d (MSR%08X=0x%016llx)\n",
- smp_processor_id(), offset, MSR_AMD64_IBSCTL, val);
- goto out;
- }
-
- if (!get_eilvt(offset)) {
- pr_err(FW_BUG "cpu %d, IBS interrupt offset %d not available (MSR%08X=0x%016llx)\n",
- smp_processor_id(), offset, MSR_AMD64_IBSCTL, val);
- goto out;
- }
-
- valid = 1;
-out:
- preempt_enable();
-
- return valid;
-}
-
-static inline int get_ibs_offset(void)
-{
- u64 val;
-
- rdmsrl(MSR_AMD64_IBSCTL, val);
- if (!(val & IBSCTL_LVT_OFFSET_VALID))
- return -EINVAL;
-
- return val & IBSCTL_LVT_OFFSET_MASK;
-}
-
-static void setup_APIC_ibs(void)
-{
- int offset;
-
- offset = get_ibs_offset();
- if (offset < 0)
- goto failed;
-
- if (!setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_NMI, 0))
- return;
-failed:
- pr_warn("oprofile: IBS APIC setup failed on cpu #%d\n",
- smp_processor_id());
-}
-
-static void clear_APIC_ibs(void)
-{
- int offset;
-
- offset = get_ibs_offset();
- if (offset >= 0)
- setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_FIX, 1);
-}
-
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
static void op_mux_switch_ctrl(struct op_x86_model_spec const *model,
@@ -473,15 +377,6 @@ static void op_amd_setup_ctrs(struct op_x86_model_spec const *model,
val |= op_x86_get_ctrl(model, &counter_config[virt]);
wrmsrl(msrs->controls[i].addr, val);
}
-
- if (ibs_caps)
- setup_APIC_ibs();
-}
-
-static void op_amd_cpu_shutdown(void)
-{
- if (ibs_caps)
- clear_APIC_ibs();
}
static int op_amd_check_ctrs(struct pt_regs * const regs,
@@ -544,86 +439,6 @@ static void op_amd_stop(struct op_msrs const * const msrs)
op_amd_stop_ibs();
}
-static int setup_ibs_ctl(int ibs_eilvt_off)
-{
- struct pci_dev *cpu_cfg;
- int nodes;
- u32 value = 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_LVT_OFFSET_VALID);
- pci_read_config_dword(cpu_cfg, IBSCTL, &value);
- if (value != (ibs_eilvt_off | IBSCTL_LVT_OFFSET_VALID)) {
- pci_dev_put(cpu_cfg);
- printk(KERN_DEBUG "Failed to setup IBS LVT offset, "
- "IBSCTL = 0x%08x\n", value);
- return -EINVAL;
- }
- } while (1);
-
- if (!nodes) {
- printk(KERN_DEBUG "No CPU node configured for IBS\n");
- return -ENODEV;
- }
-
- return 0;
-}
-
-/*
- * This runs only on the current cpu. We try to find an LVT offset and
- * setup the local APIC. For this we must disable preemption. On
- * success we initialize all nodes with this offset. This updates then
- * the offset in the IBS_CTL per-node msr. The per-core APIC setup of
- * the IBS interrupt vector is called from op_amd_setup_ctrs()/op_-
- * amd_cpu_shutdown() using the new offset.
- */
-static int force_ibs_eilvt_setup(void)
-{
- int offset;
- int ret;
-
- preempt_disable();
- /* find the next free available EILVT entry, skip offset 0 */
- for (offset = 1; offset < APIC_EILVT_NR_MAX; offset++) {
- if (get_eilvt(offset))
- break;
- }
- preempt_enable();
-
- if (offset == APIC_EILVT_NR_MAX) {
- printk(KERN_DEBUG "No EILVT entry available\n");
- return -EBUSY;
- }
-
- ret = setup_ibs_ctl(offset);
- if (ret)
- goto out;
-
- if (!ibs_eilvt_valid()) {
- ret = -EFAULT;
- goto out;
- }
-
- pr_err(FW_BUG "using offset %d for IBS interrupts\n", offset);
- pr_err(FW_BUG "workaround enabled for IBS LVT offset\n");
-
- return 0;
-out:
- preempt_disable();
- put_eilvt(offset);
- preempt_enable();
- return ret;
-}
-
/*
* check and reserve APIC extended interrupt LVT offset for IBS if
* available
@@ -636,17 +451,6 @@ static void init_ibs(void)
if (!ibs_caps)
return;
- if (ibs_eilvt_valid())
- goto out;
-
- if (!force_ibs_eilvt_setup())
- goto out;
-
- /* Failed to setup ibs */
- ibs_caps = 0;
- return;
-
-out:
printk(KERN_INFO "oprofile: AMD IBS detected (0x%08x)\n", ibs_caps);
}
@@ -729,7 +533,6 @@ struct op_x86_model_spec op_amd_spec = {
.init = op_amd_init,
.fill_in_addresses = &op_amd_fill_in_addresses,
.setup_ctrs = &op_amd_setup_ctrs,
- .cpu_down = &op_amd_cpu_shutdown,
.check_ctrs = &op_amd_check_ctrs,
.start = &op_amd_start,
.stop = &op_amd_stop,
diff --git a/arch/x86/oprofile/op_x86_model.h b/arch/x86/oprofile/op_x86_model.h
index 89017fa..71e8a67 100644
--- a/arch/x86/oprofile/op_x86_model.h
+++ b/arch/x86/oprofile/op_x86_model.h
@@ -43,7 +43,6 @@ struct op_x86_model_spec {
int (*fill_in_addresses)(struct op_msrs * const msrs);
void (*setup_ctrs)(struct op_x86_model_spec const *model,
struct op_msrs const * const msrs);
- void (*cpu_down)(void);
int (*check_ctrs)(struct pt_regs * const regs,
struct op_msrs const * const msrs);
void (*start)(struct op_msrs const * const msrs);
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