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Date: Tue, 22 Jul 2008 21:08:55 +0200
From: Robert Richter <robert.richter@....com>
To: Barry Kasindorf <barry.kasindorf@....com>,
Ingo Molnar <mingo@...e.hu>
CC: Thomas Gleixner <tglx@...utronix.de>,
oprofile-list <oprofile-list@...ts.sourceforge.net>,
LKML <linux-kernel@...r.kernel.org>,
Barry Kasindorf <barry.kasindorf@....com>,
Robert Richter <robert.richter@....com>
Subject: [PATCH 11/24] x86/oprofile: Add IBS support for AMD CPUs, model specific code
From: Barry Kasindorf <barry.kasindorf@....com>
This patchset supports the new profiling hardware available in the
latest AMD CPUs in the oProfile driver.
Signed-off-by: Barry Kasindorf <barry.kasindorf@....com>
Signed-off-by: Robert Richter <robert.richter@....com>
---
arch/x86/oprofile/op_model_athlon.c | 257 +++++++++++++++++++++++++++++++++++
1 files changed, 257 insertions(+), 0 deletions(-)
diff --git a/arch/x86/oprofile/op_model_athlon.c b/arch/x86/oprofile/op_model_athlon.c
index 40ecb02..229e0b4 100644
--- a/arch/x86/oprofile/op_model_athlon.c
+++ b/arch/x86/oprofile/op_model_athlon.c
@@ -9,9 +9,13 @@
* @author Philippe Elie
* @author Graydon Hoare
* @author Robert Richter <robert.richter@....com>
+ * @author Barry Kasindorf
*/
#include <linux/oprofile.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+
#include <asm/ptrace.h>
#include <asm/msr.h>
#include <asm/nmi.h>
@@ -43,7 +47,83 @@
#define CTRL_SET_HOST_ONLY(val, h) (val |= ((h & 1) << 9))
#define CTRL_SET_GUEST_ONLY(val, h) (val |= ((h & 1) << 8))
+#define IBS_FETCH_CTL_HIGH_MASK 0xFFFFFFFF
+/* high dword bit IbsFetchCtl[bit 49] */
+#define IBS_FETCH_VALID_BIT (1UL << 17)
+/* high dword bit IbsFetchCtl[bit 52] */
+#define IBS_FETCH_PHY_ADDR_VALID_BIT (1UL << 20)
+/* high dword bit IbsFetchCtl[bit 48] */
+#define IBS_FETCH_ENABLE (1UL << 16)
+
+#define IBS_FETCH_CTL_CNT_MASK 0x00000000FFFF0000UL
+#define IBS_FETCH_CTL_MAX_CNT_MASK 0x000000000000FFFFUL
+
+/*IbsOpCtl masks/bits */
+#define IBS_OP_VALID_BIT (1ULL<<18) /* IbsOpCtl[bit18] */
+#define IBS_OP_ENABLE (1ULL<<17) /* IBS_OP_ENABLE[bit17]*/
+
+/* Codes used in cpu_buffer.c */
+#define IBS_FETCH_BEGIN 3
+#define IBS_OP_BEGIN 4
+
+/*IbsOpData3 masks */
+#define IBS_CTL_LVT_OFFSET_VALID_BIT (1ULL<<8)
+
+/*PCI Extended Configuration Constants */
+/* MSR to set the IBS control register APIC LVT offset */
+#define IBS_LVT_OFFSET_PCI 0x1CC
+
+struct ibs_fetch_sample {
+ /* MSRC001_1031 IBS Fetch Linear Address Register */
+ unsigned int ibs_fetch_lin_addr_low;
+ unsigned int ibs_fetch_lin_addr_high;
+ /* MSRC001_1030 IBS Fetch Control Register */
+ unsigned int ibs_fetch_ctl_low;
+ unsigned int ibs_fetch_ctl_high;
+ /* MSRC001_1032 IBS Fetch Physical Address Register */
+ unsigned int ibs_fetch_phys_addr_low;
+ unsigned int ibs_fetch_phys_addr_high;
+};
+
+struct ibs_op_sample {
+ /* MSRC001_1034 IBS Op Logical Address Register (IbsRIP) */
+ unsigned int ibs_op_rip_low;
+ unsigned int ibs_op_rip_high;
+ /* MSRC001_1035 IBS Op Data Register */
+ unsigned int ibs_op_data1_low;
+ unsigned int ibs_op_data1_high;
+ /* MSRC001_1036 IBS Op Data 2 Register */
+ unsigned int ibs_op_data2_low;
+ unsigned int ibs_op_data2_high;
+ /* MSRC001_1037 IBS Op Data 3 Register */
+ unsigned int ibs_op_data3_low;
+ unsigned int ibs_op_data3_high;
+ /* MSRC001_1038 IBS DC Linear Address Register (IbsDcLinAd) */
+ unsigned int ibs_dc_linear_low;
+ unsigned int ibs_dc_linear_high;
+ /* MSRC001_1039 IBS DC Physical Address Register (IbsDcPhysAd) */
+ unsigned int ibs_dc_phys_low;
+ unsigned int ibs_dc_phys_high;
+};
+
+/*
+ * unitialize the APIC for the IBS interrupts if needed on AMD Family10h+
+*/
+static void clear_ibs_nmi(void);
+
static unsigned long reset_value[NUM_COUNTERS];
+static int ibs_allowed; /* AMD Family10h and later */
+
+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;
+ unsigned long dispatched_ops;
+};
+
+static struct op_ibs_config ibs_config;
/* functions for op_amd_spec */
@@ -121,6 +201,8 @@ static int op_amd_check_ctrs(struct pt_regs * const regs,
{
unsigned int low, high;
int i;
+ struct ibs_fetch_sample ibs_fetch;
+ struct ibs_op_sample ibs_op;
for (i = 0 ; i < NUM_COUNTERS; ++i) {
if (!reset_value[i])
@@ -132,6 +214,65 @@ static int op_amd_check_ctrs(struct pt_regs * const regs,
}
}
+ /*If AMD and IBS is available */
+ if (ibs_allowed && ibs_config.fetch_enabled) {
+ rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
+ if (high & IBS_FETCH_VALID_BIT) {
+ ibs_fetch.ibs_fetch_ctl_high = high;
+ ibs_fetch.ibs_fetch_ctl_low = low;
+ rdmsr(MSR_AMD64_IBSFETCHLINAD, low, high);
+ ibs_fetch.ibs_fetch_lin_addr_high = high;
+ ibs_fetch.ibs_fetch_lin_addr_low = low;
+ rdmsr(MSR_AMD64_IBSFETCHPHYSAD, low, high);
+ ibs_fetch.ibs_fetch_phys_addr_high = high;
+ ibs_fetch.ibs_fetch_phys_addr_low = low;
+
+ oprofile_add_ibs_sample(regs,
+ (unsigned int *)&ibs_fetch,
+ IBS_FETCH_BEGIN);
+
+ /*reenable the IRQ */
+ rdmsr(MSR_AMD64_IBSFETCHCTL, low, high);
+ high &= ~(IBS_FETCH_VALID_BIT);
+ high |= IBS_FETCH_ENABLE;
+ low &= IBS_FETCH_CTL_MAX_CNT_MASK;
+ wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
+ }
+ }
+
+ if (ibs_allowed && ibs_config.op_enabled) {
+ rdmsr(MSR_AMD64_IBSOPCTL, low, high);
+ if (low & IBS_OP_VALID_BIT) {
+ rdmsr(MSR_AMD64_IBSOPRIP, low, high);
+ ibs_op.ibs_op_rip_low = low;
+ ibs_op.ibs_op_rip_high = high;
+ rdmsr(MSR_AMD64_IBSOPDATA, low, high);
+ ibs_op.ibs_op_data1_low = low;
+ ibs_op.ibs_op_data1_high = high;
+ rdmsr(MSR_AMD64_IBSOPDATA2, low, high);
+ ibs_op.ibs_op_data2_low = low;
+ ibs_op.ibs_op_data2_high = high;
+ rdmsr(MSR_AMD64_IBSOPDATA3, low, high);
+ ibs_op.ibs_op_data3_low = low;
+ ibs_op.ibs_op_data3_high = high;
+ rdmsr(MSR_AMD64_IBSDCLINAD, low, high);
+ ibs_op.ibs_dc_linear_low = low;
+ ibs_op.ibs_dc_linear_high = high;
+ rdmsr(MSR_AMD64_IBSDCPHYSAD, low, high);
+ ibs_op.ibs_dc_phys_low = low;
+ ibs_op.ibs_dc_phys_high = high;
+
+ /* reenable the IRQ */
+ oprofile_add_ibs_sample(regs,
+ (unsigned int *)&ibs_op,
+ IBS_OP_BEGIN);
+ rdmsr(MSR_AMD64_IBSOPCTL, low, high);
+ low &= ~(IBS_OP_VALID_BIT);
+ low |= IBS_OP_ENABLE;
+ wrmsr(MSR_AMD64_IBSOPCTL, low, high);
+ }
+ }
+
/* See op_model_ppro.c */
return 1;
}
@@ -148,6 +289,17 @@ static void op_amd_start(struct op_msrs const * const msrs)
CTRL_WRITE(low, high, msrs, i);
}
}
+ if (ibs_allowed && ibs_config.fetch_enabled) {
+ low = (ibs_config.max_cnt_fetch >> 4) & 0xFFFF;
+ high = IBS_FETCH_ENABLE;
+ wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
+ }
+
+ if (ibs_allowed && ibs_config.op_enabled) {
+ low = ((ibs_config.max_cnt_op >> 4) & 0xFFFF) + IBS_OP_ENABLE;
+ high = 0;
+ wrmsr(MSR_AMD64_IBSOPCTL, low, high);
+ }
}
@@ -165,6 +317,18 @@ static void op_amd_stop(struct op_msrs const * const msrs)
CTRL_SET_INACTIVE(low);
CTRL_WRITE(low, high, msrs, i);
}
+
+ if (ibs_allowed && ibs_config.fetch_enabled) {
+ low = 0; /* clear max count and enable */
+ high = 0;
+ wrmsr(MSR_AMD64_IBSFETCHCTL, low, high);
+ }
+
+ if (ibs_allowed && ibs_config.op_enabled) {
+ low = 0; /* clear max count and enable */
+ high = 0;
+ wrmsr(MSR_AMD64_IBSOPCTL, low, high);
+ }
}
static void op_amd_shutdown(struct op_msrs const * const msrs)
@@ -181,6 +345,99 @@ static void op_amd_shutdown(struct op_msrs const * const msrs)
}
}
+static inline void apic_init_ibs_nmi_per_cpu(void *arg)
+{
+ setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_NMI, 0);
+}
+
+static inline void apic_clear_ibs_nmi_per_cpu(void *arg)
+{
+ setup_APIC_eilvt_ibs(0, APIC_EILVT_MSG_FIX, 1);
+}
+
+/*
+ * initialize the APIC for the IBS interrupts
+ * if needed on AMD Family10h rev B0 and later
+ */
+static void setup_ibs(void)
+{
+ struct pci_dev *gh_device = NULL;
+ u32 low, high;
+ u8 vector;
+
+ ibs_allowed = boot_cpu_has(X86_FEATURE_IBS);
+
+ if (!ibs_allowed)
+ return;
+
+ /* This gets the APIC_EILVT_LVTOFF_IBS value */
+ vector = setup_APIC_eilvt_ibs(0, 0, 1);
+
+ /*see if the IBS control register is already set correctly*/
+ /*remove this when we know for sure it is done
+ in the kernel init*/
+ rdmsr(MSR_AMD64_IBSCTL, low, high);
+ if ((low & (IBS_CTL_LVT_OFFSET_VALID_BIT | vector)) !=
+ (IBS_CTL_LVT_OFFSET_VALID_BIT | vector)) {
+
+ /**** Be sure to run loop until NULL is returned to
+ decrement reference count on any pci_dev structures
+ returned ****/
+ while ((gh_device = pci_get_device(PCI_VENDOR_ID_AMD,
+ PCI_DEVICE_ID_AMD_10H_NB_MISC, gh_device))
+ != NULL) {
+ /* This code may change if we can find a proper
+ * way to get at the PCI extended config space */
+ pci_write_config_dword(
+ gh_device, IBS_LVT_OFFSET_PCI,
+ (vector | IBS_CTL_LVT_OFFSET_VALID_BIT));
+ }
+ }
+ on_each_cpu(apic_init_ibs_nmi_per_cpu, NULL, 1, 1);
+}
+
+
+/*
+ * unitialize the APIC for the IBS interrupts if needed on AMD Family10h
+ * rev B0 and later */
+static void clear_ibs_nmi(void)
+{
+ if (ibs_allowed)
+ on_each_cpu(apic_clear_ibs_nmi_per_cpu, NULL, 1, 1);
+}
+
+static void setup_ibs_files(struct super_block *sb, struct dentry *root)
+{
+ char buf[12];
+ struct dentry *dir;
+
+ if (!ibs_allowed)
+ return;
+
+ /* 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;
+ ibs_config.dispatched_ops = 1;
+ snprintf(buf, sizeof(buf), "ibs_fetch");
+ dir = oprofilefs_mkdir(sb, root, buf);
+ oprofilefs_create_ulong(sb, dir, "rand_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);
+ oprofilefs_create_ulong(sb, dir, "dispatched_ops",
+ &ibs_config.dispatched_ops);
+}
+
static int op_amd_init(struct oprofile_operations *ops)
{
return 0;
--
1.5.5.4
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