[Xen-devel] [PATCH v12 6/9] x86: collect global QoS monitoring information

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

This implementation tries to put all policies into user space, thus some
global QoS monitoring information needs to be exposed, such as the total
RMID count, L3 upscaling factor, etc.

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
 xen/arch/x86/sysctl.c       |   56 +++++++++++++++++++++++++++++++++++++++++++
 xen/include/public/sysctl.h |   14 +++++++++++
 2 files changed, 70 insertions(+)

diff --git a/xen/arch/x86/sysctl.c b/xen/arch/x86/sysctl.c
index 15d4b91..0a21ad2 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -28,6 +28,7 @@
 #include <xen/nodemask.h>
 #include <xen/cpu.h>
 #include <xsm/xsm.h>
+#include <asm/pqos.h>
 
 #define get_xen_guest_handle(val, hnd)  do { val = (hnd).p; } while (0)
 
@@ -70,6 +71,7 @@ long arch_do_sysctl(
     struct xen_sysctl *sysctl, XEN_GUEST_HANDLE_PARAM(xen_sysctl_t) u_sysctl)
 {
     long ret = 0;
+    bool_t copyback = 0;
 
     switch ( sysctl->cmd )
     {
@@ -101,11 +103,65 @@ long arch_do_sysctl(
     }
     break;
 
+    case XEN_SYSCTL_pqos_monitor_op:
+        if ( !pqos_monitor_enabled() )
+            return -ENODEV;
+
+        switch ( sysctl->u.pqos_monitor_op.cmd )
+        {
+        case XEN_SYSCTL_PQOS_MONITOR_cqm_enabled:
+            sysctl->u.pqos_monitor_op.data =
+                (pqosm->qm_features & QOS_MONITOR_TYPE_L3) &&
+                (pqosm->l3m.l3_features & L3_FEATURE_OCCUPANCY);
+            break;
+        case XEN_SYSCTL_PQOS_MONITOR_get_total_rmid:
+            sysctl->u.pqos_monitor_op.data =
+                pqosm->rmid_max - pqosm->rmid_min + 1;
+            break;
+        case XEN_SYSCTL_PQOS_MONITOR_get_l3_upscaling_factor:
+            sysctl->u.pqos_monitor_op.data = pqosm->l3m.upscaling_factor;
+            break;
+        case XEN_SYSCTL_PQOS_MONITOR_get_l3_cache_size:
+            sysctl->u.pqos_monitor_op.data = boot_cpu_data.x86_cache_size;
+            break;
+        case XEN_SYSCTL_PQOS_MONITOR_get_socket_cpu:
+        {
+            unsigned int i, cpu;
+            unsigned int socket = sysctl->u.pqos_monitor_op.data;
+
+            for ( i = 0; i < nr_cpu_ids; i++ )
+            {
+                if ( cpu_to_socket(i) < 0 || cpu_to_socket(i) != socket )
+                    continue;
+                cpu = cpumask_any(per_cpu(cpu_core_mask, i));
+                if ( cpu < nr_cpu_ids )
+                {
+                    sysctl->u.pqos_monitor_op.data = cpu;
+                    break;
+                }
+            }
+
+            if ( i == nr_cpu_ids )
+                ret = -ESRCH;
+        }
+        break;
+
+        default:
+            sysctl->u.pqos_monitor_op.data = 0;
+            ret = -ENOSYS;
+            break;
+        }
+        copyback = 1;
+        break;
+
     default:
         ret = -ENOSYS;
         break;
     }
 
+    if ( copyback && __copy_to_guest(u_sysctl, sysctl, 1) )
+        ret = -EFAULT;
+
     return ret;
 }
 
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index 3588698..5ec1212 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -636,6 +636,18 @@ struct xen_sysctl_coverage_op {
 typedef struct xen_sysctl_coverage_op xen_sysctl_coverage_op_t;
 DEFINE_XEN_GUEST_HANDLE(xen_sysctl_coverage_op_t);
 
+#define XEN_SYSCTL_PQOS_MONITOR_get_total_rmid            0
+#define XEN_SYSCTL_PQOS_MONITOR_get_l3_upscaling_factor   1
+#define XEN_SYSCTL_PQOS_MONITOR_get_l3_cache_size         2
+#define XEN_SYSCTL_PQOS_MONITOR_get_socket_cpu            3
+#define XEN_SYSCTL_PQOS_MONITOR_cqm_enabled               4
+struct xen_sysctl_pqos_monitor_op {
+    uint32_t cmd;
+    uint64_aligned_t data;
+};
+typedef struct xen_sysctl_pqos_monitor_op xen_sysctl_pqos_monitor_op_t;
+DEFINE_XEN_GUEST_HANDLE(xen_sysctl_pqos_monitor_op_t);
+
 
 struct xen_sysctl {
     uint32_t cmd;
@@ -658,6 +670,7 @@ struct xen_sysctl {
 #define XEN_SYSCTL_cpupool_op                    18
 #define XEN_SYSCTL_scheduler_op                  19
 #define XEN_SYSCTL_coverage_op                   20
+#define XEN_SYSCTL_pqos_monitor_op               21
     uint32_t interface_version; /* XEN_SYSCTL_INTERFACE_VERSION */
     union {
         struct xen_sysctl_readconsole       readconsole;
@@ -679,6 +692,7 @@ struct xen_sysctl {
         struct xen_sysctl_cpupool_op        cpupool_op;
         struct xen_sysctl_scheduler_op      scheduler_op;
         struct xen_sysctl_coverage_op       coverage_op;
+        struct xen_sysctl_pqos_monitor_op   pqos_monitor_op;
         uint8_t                             pad[128];
     } u;
 };
-- 
1.7.9.5


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