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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 1/8] x86: detect and initialize Cache QoS Monitoring feature
From: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
Detect platform QoS feature status and enumerate the resource types,
one of which is to monitor the L3 cache occupancy.
Also introduce a Xen grub command line parameter to control the
QoS feature status globally.
Signed-off-by: Jiongxi Li <jiongxi.li@xxxxxxxxx>
Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
xen/arch/x86/Makefile | 1 +
xen/arch/x86/cpu/intel.c | 6 +++
xen/arch/x86/pqos.c | 89 ++++++++++++++++++++++++++++++++++++++
xen/arch/x86/setup.c | 3 ++
xen/include/asm-x86/cpufeature.h | 1 +
xen/include/asm-x86/pqos.h | 37 ++++++++++++++++
6 files changed, 137 insertions(+)
create mode 100644 xen/arch/x86/pqos.c
create mode 100644 xen/include/asm-x86/pqos.h
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index d502bdf..54962e0 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -58,6 +58,7 @@ obj-y += crash.o
obj-y += tboot.o
obj-y += hpet.o
obj-y += xstate.o
+obj-y += pqos.o
obj-$(crash_debug) += gdbstub.o
diff --git a/xen/arch/x86/cpu/intel.c b/xen/arch/x86/cpu/intel.c
index 27fe762..f0d83ea 100644
--- a/xen/arch/x86/cpu/intel.c
+++ b/xen/arch/x86/cpu/intel.c
@@ -230,6 +230,12 @@ static void __devinit init_intel(struct cpuinfo_x86 *c)
( c->cpuid_level >= 0x00000006 ) &&
( cpuid_eax(0x00000006) & (1u<<2) ) )
set_bit(X86_FEATURE_ARAT, c->x86_capability);
+
+ /* Check platform QoS monitoring capability */
+ if ((c->cpuid_level >= 0x00000007) &&
+ (cpuid_ebx(0x00000007) & (1u<<12)))
+ set_bit(X86_FEATURE_QOSM, c->x86_capability);
+
}
static struct cpu_dev intel_cpu_dev __cpuinitdata = {
diff --git a/xen/arch/x86/pqos.c b/xen/arch/x86/pqos.c
new file mode 100644
index 0000000..617cce1
--- /dev/null
+++ b/xen/arch/x86/pqos.c
@@ -0,0 +1,89 @@
+/*
+ * pqos.c: Platform QoS related service for guest.
+ *
+ * Copyright (c) 2013, Intel Corporation
+ * Author: Jiongxi Li <jiongxi.li@xxxxxxxxx>
+ * Author: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include <asm/processor.h>
+#include <xen/init.h>
+#include <asm/pqos.h>
+
+static bool_t pqos_enabled = 1;
+boolean_param("pqos", pqos_enabled);
+
+unsigned int cqm_res_count = 0;
+unsigned int cqm_upscaling_factor = 0;
+bool_t cqm_enabled = 0;
+struct cqm_res_struct *cqm_res_array = NULL;
+
+static void init_cqm(void)
+{
+ unsigned int eax, edx;
+ unsigned int max_cqm_rmid;
+
+ cpuid_count(0xf, 1, &eax, &cqm_upscaling_factor, &max_cqm_rmid, &edx);
+ if ( !(edx & QOS_MONITOR_EVTID_L3) )
+ return;
+
+ cqm_res_count = max_cqm_rmid + 1;
+
+ cqm_res_array = xzalloc_array(struct cqm_res_struct, cqm_res_count);
+ if ( !cqm_res_array )
+ {
+ cqm_res_count = 0;
+ return;
+ }
+
+ cqm_enabled = 1;
+
+ /* Reserve RMID 0 for all domains not being monitored */
+ cqm_res_array[0].inuse = 1;
+
+ printk("Cache QoS Monitoring Enabled.\n");
+}
+
+static void init_qos_monitor(void)
+{
+ unsigned int qm_features;
+ unsigned int eax, ebx, ecx;
+
+ if ( !(boot_cpu_has(X86_FEATURE_QOSM)) )
+ return;
+
+ cpuid_count(0xf, 0, &eax, &ebx, &ecx, &qm_features);
+
+ if ( qm_features & QOS_MONITOR_TYPE_L3 )
+ init_cqm();
+}
+
+void init_platform_qos(void)
+{
+ if ( !pqos_enabled )
+ return;
+
+ init_qos_monitor();
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 5bf4ee0..95418e4 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -48,6 +48,7 @@
#include <asm/setup.h>
#include <xen/cpu.h>
#include <asm/nmi.h>
+#include <asm/pqos.h>
/* opt_nosmp: If true, secondary processors are ignored. */
static bool_t __initdata opt_nosmp;
@@ -1402,6 +1403,8 @@ void __init __start_xen(unsigned long mbi_p)
domain_unpause_by_systemcontroller(dom0);
+ init_platform_qos();
+
reset_stack_and_jump(init_done);
}
diff --git a/xen/include/asm-x86/cpufeature.h b/xen/include/asm-x86/cpufeature.h
index 1cfaf94..ca59668 100644
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -147,6 +147,7 @@
#define X86_FEATURE_ERMS (7*32+ 9) /* Enhanced REP MOVSB/STOSB */
#define X86_FEATURE_INVPCID (7*32+10) /* Invalidate Process Context ID */
#define X86_FEATURE_RTM (7*32+11) /* Restricted Transactional Memory */
+#define X86_FEATURE_QOSM (7*32+12) /* Platform QoS monitoring capability
*/
#define X86_FEATURE_NO_FPU_SEL (7*32+13) /* FPU CS/DS stored as zero */
#define X86_FEATURE_SMAP (7*32+20) /* Supervisor Mode Access Prevention
*/
diff --git a/xen/include/asm-x86/pqos.h b/xen/include/asm-x86/pqos.h
new file mode 100644
index 0000000..2184ea9
--- /dev/null
+++ b/xen/include/asm-x86/pqos.h
@@ -0,0 +1,37 @@
+/*
+ * pqos.h: Platform QoS related service for guest.
+ *
+ * Copyright (c) 2013, Intel Corporation
+ * Author: Jiongxi Li <jiongxi.li@xxxxxxxxx>
+ * Author: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ */
+#ifndef ASM_PQOS_H
+#define ASM_PQOS_H
+
+/* QoS Resource Type Enumeration */
+#define QOS_MONITOR_TYPE_L3 0x2
+
+/* QoS Monitoring Event ID */
+#define QOS_MONITOR_EVTID_L3 0x1
+
+struct cqm_res_struct {
+ bool_t inuse;
+ uint16_t domain_id;
+};
+
+void init_platform_qos(void);
+
+#endif
--
1.7.9.5
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