[Xen-devel] [PATCH v13 17/23] x86: L2 CAT: implement get hw info flow.

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

This patch implements L2 CAT get HW info flow and interface in sysctl.

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v10:
    - modify macro name according to previous patch change.
      (suggested by Jan Beulich)
    - modify commit message.
v9:
    - reuse 'cat_get_feat_info' for L2 CAT to reduce redundant codes.
      (suggested by Roger Pau)
    - modify sysctl implementation of L2 CAT to input data[3] to use
      'cat_get_feat_info'.
      (suggested by Roger Pau)
    - modify macros names to newly defined ones.
      (suggested by Jan Beulich)
    - remove 'l2_info' to reuse 'l3_info'.
      (suggested by Jan Beulich)
    - modify macro name according to previous patch change.
      (suggested by Jan Beulich)
v5:
    - rename 'dat[]' to 'data[]'
      (suggested by Jan Beulich)
    - remove type check in callback function.
      (suggested by Jan Beulich)
v4:
    - create this patch because of codes architecture change.
      (suggested by Jan Beulich)
---
 xen/arch/x86/psr.c          |  5 +++++
 xen/arch/x86/sysctl.c       | 23 +++++++++++++++++++++--
 xen/include/public/sysctl.h |  1 +
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 81c9454..610a55c 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -240,6 +240,10 @@ static enum psr_feat_type psr_cbm_type_to_feat_type(enum 
cbm_type type)
         feat_type = FEAT_TYPE_L3_CDP;
         break;
 
+    case PSR_CBM_TYPE_L2:
+        feat_type = FEAT_TYPE_L2_CAT;
+        break;
+
     default:
         ASSERT_UNREACHABLE();
     }
@@ -407,6 +411,7 @@ static const struct feat_props l2_cat_props = {
     .cos_num = 1,
     .type[0] = PSR_CBM_TYPE_L2,
     .alt_type = PSR_CBM_TYPE_UNKNOWN,
+    .get_feat_info = cat_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 c23270d..5e91755 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -174,10 +174,10 @@ long arch_do_sysctl(
     case XEN_SYSCTL_psr_cat_op:
         switch ( sysctl->u.psr_cat_op.cmd )
         {
-        case XEN_SYSCTL_PSR_CAT_get_l3_info:
-        {
             uint32_t data[PSR_INFO_ARRAY_SIZE];
 
+        case XEN_SYSCTL_PSR_CAT_get_l3_info:
+        {
             ret = psr_get_info(sysctl->u.psr_cat_op.target,
                                PSR_CBM_TYPE_L3, data, ARRAY_SIZE(data));
             if ( ret )
@@ -195,6 +195,25 @@ long arch_do_sysctl(
             break;
         }
 
+        case XEN_SYSCTL_PSR_CAT_get_l2_info:
+        {
+            ret = psr_get_info(sysctl->u.psr_cat_op.target,
+                               PSR_CBM_TYPE_L2, data, ARRAY_SIZE(data));
+            if ( ret )
+                break;
+
+            sysctl->u.psr_cat_op.u.l3_info.cos_max =
+                                      data[PSR_INFO_IDX_COS_MAX];
+            sysctl->u.psr_cat_op.u.l3_info.cbm_len =
+                                      data[PSR_INFO_IDX_CAT_CBM_LEN];
+            sysctl->u.psr_cat_op.u.l3_info.flags =
+                                      data[PSR_INFO_IDX_CAT_FLAG];
+
+            if ( !ret && __copy_field_to_guest(u_sysctl, sysctl, u.psr_cat_op) 
)
+                ret = -EFAULT;
+            break;
+        }
+
         default:
             ret = -EOPNOTSUPP;
             break;
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index ee76a66..4c76d3a 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -744,6 +744,7 @@ typedef struct xen_sysctl_pcitopoinfo 
xen_sysctl_pcitopoinfo_t;
 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
 struct xen_sysctl_psr_cat_op {
     uint32_t cmd;       /* IN: XEN_SYSCTL_PSR_CAT_* */
     uint32_t target;    /* IN */
-- 
1.9.1


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