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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v12 4/9] x86: detect and initialize Platform QoS Monitoring feature
Detect platform QoS feature status and enumerate the resource types,
one of which is to monitor the L3 cache occupancy.
Also introduce a Xen command line parameter to control the QoS
feature status.
Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
docs/misc/xen-command-line.markdown | 14 +++++
xen/arch/x86/Makefile | 1 +
xen/arch/x86/pqos.c | 117 +++++++++++++++++++++++++++++++++++
xen/arch/x86/setup.c | 3 +
xen/include/asm-x86/cpufeature.h | 1 +
xen/include/asm-x86/pqos.h | 56 +++++++++++++++++
6 files changed, 192 insertions(+)
create mode 100644 xen/arch/x86/pqos.c
create mode 100644 xen/include/asm-x86/pqos.h
diff --git a/docs/misc/xen-command-line.markdown
b/docs/misc/xen-command-line.markdown
index 94f04bd..cf02884 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -863,6 +863,20 @@ This option can be specified more than once (up to 8 times
at present).
### ple\_window
> `= <integer>`
+### pqos (Intel)
+> `= List of ( <boolean> | pqos_monitor:<boolean> | rmid_max:<integer> )`
+
+> Default: `pqos=1,pqos_monitor:1,rmid_max:255`
+
+Configure platform QoS services, which are available in some of the new
+Intel processors.
+
+`pqos` instructs Xen to enable/disable platform QoS service.
+
+`pqos_monitor` instructs Xen to enable/disable QoS monitoring service.
+
+`rmid_max` indicates the max value for rmid.
+
### reboot
> `= t[riple] | k[bd] | n[o] [, [w]arm | [c]old]`
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index e0cee24..a508bc6 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -60,6 +60,7 @@ obj-y += tboot.o
obj-y += hpet.o
obj-y += xstate.o
obj-y += resource.o
+obj-y += pqos.o
obj-$(crash_debug) += gdbstub.o
diff --git a/xen/arch/x86/pqos.c b/xen/arch/x86/pqos.c
new file mode 100644
index 0000000..513dd0f
--- /dev/null
+++ b/xen/arch/x86/pqos.c
@@ -0,0 +1,117 @@
+/*
+ * pqos.c: Platform QoS related service for guest.
+ *
+ * Copyright (c) 2014, Intel Corporation
+ * 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.
+ */
+#include <xen/init.h>
+#include <xen/cpu.h>
+#include <asm/pqos.h>
+
+struct pqos_monitor *__read_mostly pqosm = NULL;
+static bool_t __initdata opt_pqos = 0;
+static bool_t __initdata opt_pqos_monitor = 0;
+static unsigned int __initdata opt_rmid_max = 255;
+
+static void __init parse_pqos_param(char *s)
+{
+ char *ss, *val_str;
+ int val;
+
+ do {
+ ss = strchr(s, ',');
+ if ( ss )
+ *ss = '\0';
+
+ val = parse_bool(s);
+ if ( val >= 0 )
+ opt_pqos = val;
+ else
+ {
+ val = !!strncmp(s, "no-", 3);
+ if ( !val )
+ s += 3;
+
+ val_str = strchr(s, ':');
+ if ( val_str )
+ *val_str++ = '\0';
+
+ if ( val_str && !strcmp(s, "pqos_monitor") &&
+ (val = parse_bool(val_str)) >= 0 )
+ opt_pqos_monitor = val;
+ else if ( val_str && !strcmp(s, "rmid_max") )
+ opt_rmid_max = simple_strtoul(val_str, NULL, 0);
+ }
+
+ s = ss + 1;
+ } while ( ss );
+}
+
+custom_param("pqos", parse_pqos_param);
+static void __init init_pqos_monitor(unsigned int rmid_max)
+{
+ unsigned int eax, ebx, ecx, edx;
+ unsigned int rmid;
+
+ if ( !boot_cpu_has(X86_FEATURE_QOSM) )
+ return;
+
+ cpuid_count(0xf, 0, &eax, &ebx, &ecx, &edx);
+ if ( !edx )
+ return;
+
+ pqosm = xzalloc(struct pqos_monitor);
+ if ( !pqosm )
+ return;
+
+ pqosm->qm_features = edx;
+ pqosm->rmid_mask = ~(~0ull << get_count_order(ebx));
+ pqosm->rmid_inuse = 0;
+ pqosm->rmid_min = 1;
+ pqosm->rmid_max = min(rmid_max, ebx);
+
+ if ( pqosm->qm_features & QOS_MONITOR_TYPE_L3 ) {
+ cpuid_count(0xf, 1, &eax, &ebx, &ecx, &edx);
+ pqosm->l3m.upscaling_factor = ebx;
+ pqosm->l3m.rmid_max = ecx;
+ pqosm->l3m.l3_features = edx;
+ }
+
+ pqosm->rmid_max = min(rmid_max, pqosm->l3m.rmid_max);
+ pqosm->rmid_to_dom = xmalloc_array(domid_t, pqosm->rmid_max + 1);
+ if ( !pqosm->rmid_to_dom ) {
+ xfree(pqosm);
+ return;
+ }
+ /* Reserve RMID 0 for all domains not being monitored */
+ pqosm->rmid_to_dom[0] = DOMID_XEN;
+ for ( rmid = pqosm->rmid_min; rmid <= pqosm->rmid_max; rmid++ )
+ pqosm->rmid_to_dom[rmid] = DOMID_INVALID;
+
+ printk(XENLOG_INFO "Platform QoS Monitoring Enabled.\n");
+}
+
+void __init init_platform_qos(void)
+{
+ if ( opt_pqos && opt_pqos_monitor && opt_rmid_max )
+ init_pqos_monitor(opt_rmid_max);
+}
+
+/*
+ * 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 599cf04..2bbabd2 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -49,6 +49,7 @@
#include <xen/cpu.h>
#include <asm/nmi.h>
#include <asm/alternative.h>
+#include <asm/pqos.h>
/* opt_nosmp: If true, secondary processors are ignored. */
static bool_t __initdata opt_nosmp;
@@ -1441,6 +1442,8 @@ void __init noreturn __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 8014241..eb1dd27 100644
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -148,6 +148,7 @@
#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_MPX (7*32+14) /* Memory Protection
Extensions */
#define X86_FEATURE_RDSEED (7*32+18) /* RDSEED instruction */
diff --git a/xen/include/asm-x86/pqos.h b/xen/include/asm-x86/pqos.h
new file mode 100644
index 0000000..1ec7970
--- /dev/null
+++ b/xen/include/asm-x86/pqos.h
@@ -0,0 +1,56 @@
+/*
+ * pqos.h: Platform QoS related service for guest.
+ *
+ * Copyright (c) 2014, Intel Corporation
+ * 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.
+ */
+#ifndef __ASM_PQOS_H__
+#define __ASM_PQOS_H__
+
+#include <public/xen.h>
+
+/* QoS Resource Type Enumeration */
+#define QOS_MONITOR_TYPE_L3 0x2
+
+/* L3 Monitoring Features */
+#define L3_FEATURE_OCCUPANCY 0x1
+
+struct pqos_monitor_l3 {
+ unsigned int l3_features;
+ unsigned int upscaling_factor;
+ unsigned int rmid_max;
+};
+
+struct pqos_monitor {
+ unsigned long rmid_mask;
+ unsigned int rmid_min;
+ unsigned int rmid_max;
+ unsigned int rmid_inuse;
+ unsigned int qm_features;
+ domid_t *rmid_to_dom;
+ struct pqos_monitor_l3 l3m;
+};
+extern struct pqos_monitor *pqosm;
+
+void __init init_platform_qos(void);
+
+#endif /* __ASM_PQOS_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.7.9.5
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