[PATCH v15 05/11] x86: detect and initialize Platform QoS Monitoring feature

[Chao Peng <chao.p.peng@linux.intel.com>]

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@intel.com>
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
---
 docs/misc/xen-command-line.markdown |   14 +++++
 xen/arch/x86/Makefile               |    1 +
 xen/arch/x86/pqos.c                 |  108 +++++++++++++++++++++++++++++++++++
 xen/arch/x86/setup.c                |    3 +
 xen/include/asm-x86/cpufeature.h    |    1 +
 xen/include/asm-x86/pqos.h          |   53 +++++++++++++++++
 6 files changed, 180 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 af93e17..fcda322 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -1005,6 +1005,20 @@ This option can be specified more than once (up to 8 times at present).
 ### ple\_window
 > `= <integer>`
 
+### pqos (Intel)
+> `= List of ( pqos_monitor:<boolean> | rmid_max:<integer> )`
+
+> Default: `pqos=pqos_monitor:0,rmid_max:255`
+
+Configure platform QoS services, which are available on Intel Haswell Server
+family and future platforms.
+
+`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] | a[cpi] | p[ci] | n[o] [, [w]arm | [c]old]`
 
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index c1e244d..3d92fd7 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -59,6 +59,7 @@ 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/pqos.c b/xen/arch/x86/pqos.c
new file mode 100644
index 0000000..aca9ea2
--- /dev/null
+++ b/xen/arch/x86/pqos.c
@@ -0,0 +1,108 @@
+/*
+ * pqos.c: Platform QoS related service for guest.
+ *
+ * Copyright (c) 2014, Intel Corporation
+ * Author: Dongxiao Xu <dongxiao.xu@intel.com>
+ *
+ * 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>
+
+#define PQOS_MONITOR        (1<<0)
+
+struct pqos_monitor *__read_mostly pqosm = NULL;
+static bool_t __initdata opt_pqos = 0;
+static unsigned int __initdata opt_rmid_max = 255;
+
+static void __init parse_pqos_param(char *s)
+{
+    char *ss, *val_str;
+
+    do {
+        ss = strchr(s, ',');
+        if ( ss )
+            *ss = '\0';
+
+        val_str = strchr(s, ':');
+        if ( val_str )
+            *val_str++ = '\0';
+
+        if ( !strcmp(s, "pqos_monitor")
+             && ( !val_str || parse_bool(val_str) == 1 )) {
+            opt_pqos &= PQOS_MONITOR;
+        } 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_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);
+    BUG_ON(pqosm->rmid_max < 0xffffffff);
+    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 = 1; 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_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 6a814cd..b4ad3a6 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;
@@ -1440,6 +1441,8 @@ 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..96bfdc6
--- /dev/null
+++ b/xen/include/asm-x86/pqos.h
@@ -0,0 +1,53 @@
+/*
+ * pqos.h: Platform QoS related service for guest.
+ *
+ * Copyright (c) 2014, Intel Corporation
+ * Author: Dongxiao Xu <dongxiao.xu@intel.com>
+ *
+ * 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__
+
+/* 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_max;
+    unsigned int qm_features;
+    domid_t *rmid_to_dom;
+    struct pqos_monitor_l3 l3m;
+};
+
+extern struct pqos_monitor *pqosm;
+
+void 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