[Xen-devel] [PATCH v4 18/24] x86: L2 CAT: implement get hw info flow.

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

This patch implements get HW info flow for L2 CAT including L2 CAT callback
function.

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/psr.c          | 14 ++++++++++++++
 xen/arch/x86/sysctl.c       | 15 +++++++++++++++
 xen/include/asm-x86/psr.h   |  1 +
 xen/include/public/sysctl.h |  6 ++++++
 4 files changed, 36 insertions(+)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index b890b64..6de0abf 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -774,9 +774,23 @@ static unsigned int l2_cat_get_max_cos_max(const struct 
feat_node *feat)
     return feat->info.l2_cat_info.cos_max;
 }
 
+static bool l2_cat_get_feat_info(const struct feat_node *feat,
+                                 enum cbm_type type,
+                                 uint32_t dat[], uint32_t array_len)
+{
+    if ( !dat || 2 > array_len || type != PSR_CBM_TYPE_L2 )
+        return false;
+
+    dat[CBM_LEN] = feat->info.l2_cat_info.cbm_len;
+    dat[COS_MAX] = feat->info.l2_cat_info.cos_max;
+
+    return true;
+}
+
 struct feat_ops l2_cat_ops = {
     .init_feature = l2_cat_init_feature,
     .get_max_cos_max = l2_cat_get_max_cos_max,
+    .get_feat_info = l2_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 846eeaf..dede62c 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -207,6 +207,21 @@ long arch_do_sysctl(
                 ret = -EFAULT;
             break;
         }
+        case XEN_SYSCTL_PSR_CAT_get_l2_info:
+        {
+            uint32_t dat[2];
+            ret = psr_get_info(sysctl->u.psr_cat_op.target,
+                               PSR_CBM_TYPE_L2, dat, 2);
+            if ( ret )
+                break;
+
+            sysctl->u.psr_cat_op.u.l2_info.cbm_len = dat[CBM_LEN];
+            sysctl->u.psr_cat_op.u.l2_info.cos_max = dat[COS_MAX];
+
+            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/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index a7fc13d..ee65fe5 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -56,6 +56,7 @@ enum cbm_type {
     PSR_CBM_TYPE_L3,
     PSR_CBM_TYPE_L3_CODE,
     PSR_CBM_TYPE_L3_DATA,
+    PSR_CBM_TYPE_L2,
 };
 
 extern struct psr_cmt *psr_cmt;
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index 418f4bb..0a0c9f7 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -745,6 +745,7 @@ 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 */
@@ -755,6 +756,11 @@ struct xen_sysctl_psr_cat_op {
 #define XEN_SYSCTL_PSR_CAT_L3_CDP       (1u << 0)
             uint32_t flags;     /* OUT: CAT flags */
         } l3_info;
+
+        struct {
+            uint32_t cbm_len;   /* OUT: CBM length */
+            uint32_t cos_max;   /* OUT: Maximum COS */
+        } l2_info;
     } u;
 };
 typedef struct xen_sysctl_psr_cat_op xen_sysctl_psr_cat_op_t;
-- 
1.9.1


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