[Xen-devel] [RFC 07/16] x86: implement get hw info flow for MBA.

[Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>]

This patch implements get HW info flow for MBA including its callback
function and sysctl interface.

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/psr.c          | 15 +++++++++++++++
 xen/arch/x86/sysctl.c       | 16 ++++++++++++++++
 xen/include/asm-x86/psr.h   |  3 +++
 xen/include/public/sysctl.h |  8 ++++++++
 4 files changed, 42 insertions(+)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index e2ca6fb..52452a7 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -984,9 +984,24 @@ static unsigned int mba_get_max_cos_max(const struct 
feat_node *feat)
     return feat->info.mba_info.cos_max;
 }
 
+static bool mba_get_feat_info(const struct feat_node *feat,
+                              enum psr_val_type type,
+                              uint32_t dat[], uint32_t array_len)
+{
+    if ( !dat || 3 > array_len || type != PSR_VAL_TYPE_MBA )
+        return false;
+
+    dat[THRTL_MAX]  = feat->info.mba_info.thrtl_max;
+    dat[COS_MAX]    = feat->info.mba_info.cos_max;
+    dat[LINEAR]     = feat->info.mba_info.linear;
+
+    return true;
+}
+
 struct feat_ops mba_ops = {
     .init_feature = mba_init_feature,
     .get_max_cos_max = mba_get_max_cos_max,
+    .get_feat_info = mba_get_feat_info,
 };
 
 static void __init parse_psr_bool(char *s, char *value, char *feature,
diff --git a/xen/arch/x86/sysctl.c b/xen/arch/x86/sysctl.c
index 739909b..3dd0aa3 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -222,6 +222,22 @@ long arch_do_sysctl(
                 ret = -EFAULT;
             break;
         }
+        case XEN_SYSCTL_PSR_MBA_get_info:
+        {
+            uint32_t dat[3];
+            ret = psr_get_info(sysctl->u.psr_alloc_op.target,
+                               PSR_VAL_TYPE_MBA, dat, 3);
+            if ( ret )
+                break;
+
+            sysctl->u.psr_alloc_op.u.mba_info.thrtl_max = dat[THRTL_MAX];
+            sysctl->u.psr_alloc_op.u.mba_info.cos_max   = dat[COS_MAX];
+            sysctl->u.psr_alloc_op.u.mba_info.linear    = dat[LINEAR];
+
+            if ( !ret && __copy_field_to_guest(u_sysctl, sysctl, 
u.psr_alloc_op) )
+                ret = -EFAULT;
+            break;
+        }
         default:
             ret = -EOPNOTSUPP;
             break;
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index 9dd7782..a37abdf 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -39,6 +39,8 @@
 #define CBM_LEN  0
 #define COS_MAX  1
 #define CDP_FLAG 2
+#define THRTL_MAX 0
+#define LINEAR    2
 
 struct psr_cmt_l3 {
     unsigned int features;
@@ -58,6 +60,7 @@ enum psr_val_type {
     PSR_VAL_TYPE_L3_CODE,
     PSR_VAL_TYPE_L3_DATA,
     PSR_VAL_TYPE_L2,
+    PSR_VAL_TYPE_MBA,
 };
 
 extern struct psr_cmt *psr_cmt;
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index 71edcf0..f14c921 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -745,6 +745,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_sysctl_pcitopoinfo_t);
 
 #define XEN_SYSCTL_PSR_CAT_get_l3_info               0
 #define XEN_SYSCTL_PSR_CAT_get_l2_info               1
+#define XEN_SYSCTL_PSR_MBA_get_info                  2
 struct xen_sysctl_psr_alloc_op {
     uint32_t cmd;       /* IN: XEN_SYSCTL_PSR_* */
     uint32_t target;    /* IN */
@@ -760,6 +761,13 @@ struct xen_sysctl_psr_alloc_op {
             uint32_t cbm_len;   /* OUT: CBM length */
             uint32_t cos_max;   /* OUT: Maximum COS */
         } l2_info;
+
+        struct {
+            uint32_t thrtl_max; /* OUT: Maximum throttle */
+            uint32_t cos_max;   /* OUT: Maximum COS */
+#define XEN_SYSCTL_PSR_MBA_LINEAR      (1u << 0)
+            uint32_t linear;    /* OUT: Linear mode */
+        } mba_info;
     } u;
 };
 typedef struct xen_sysctl_psr_alloc_op xen_sysctl_psr_alloc_op_t;
-- 
1.9.1


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