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>

3 files changed, 0 insertions, 200 deletions

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index adf8fb31aa7..c04dc145a4b 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 e947e5cb2e6..303f0863782 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 89017fa1fd6..71e8a67337e 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);