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[Xen-devel] [PATCH v8 14/24] x86: refactor psr: implement get hw info flow for CDP.



This patch implements get HW info flow for CDP including L3 CDP callback
function.

It also changes sysctl function to make it work for CDP.

With this patch, 'psr-hwinfo' can work for L3 CDP.

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/psr.c    | 18 ++++++++++++++++++
 xen/arch/x86/sysctl.c | 24 +++++++++++++++++++++---
 2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 4c08779..72c9888 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -270,6 +270,10 @@ static enum psr_feat_type psr_cbm_type_to_feat_type(enum 
cbm_type type)
     case PSR_CBM_TYPE_L3:
         feat_type = PSR_SOCKET_L3_CAT;
         break;
+    case PSR_CBM_TYPE_L3_DATA:
+    case PSR_CBM_TYPE_L3_CODE:
+        feat_type = PSR_SOCKET_L3_CDP;
+        break;
     default:
         feat_type = PSR_SOCKET_UNKNOWN;
         break;
@@ -528,8 +532,22 @@ static unsigned int l3_cdp_get_cos_max(const struct 
feat_node *feat)
     return feat->info.l3_cdp_info.cos_max;
 }
 
+static bool l3_cdp_get_feat_info(const struct feat_node *feat,
+                                 uint32_t data[], uint32_t array_len)
+{
+    if ( !data || 3 > array_len )
+        return false;
+
+    data[CBM_LEN] = feat->info.l3_cdp_info.cbm_len;
+    data[COS_MAX] = feat->info.l3_cdp_info.cos_max;
+    data[PSR_FLAG] |= XEN_SYSCTL_PSR_CAT_L3_CDP;
+
+    return true;
+}
+
 struct feat_ops l3_cdp_ops = {
     .get_cos_max = l3_cdp_get_cos_max,
+    .get_feat_info = l3_cdp_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 e340baa..568bfe9 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -181,9 +181,27 @@ long arch_do_sysctl(
             ret = psr_get_info(sysctl->u.psr_cat_op.target,
                                PSR_CBM_TYPE_L3, data, 3);
 
-            sysctl->u.psr_cat_op.u.l3_info.cbm_len = data[CBM_LEN];
-            sysctl->u.psr_cat_op.u.l3_info.cos_max = data[COS_MAX];
-            sysctl->u.psr_cat_op.u.l3_info.flags   = data[PSR_FLAG];
+            if ( !ret )
+            {
+                sysctl->u.psr_cat_op.u.l3_info.cbm_len = data[CBM_LEN];
+                sysctl->u.psr_cat_op.u.l3_info.cos_max = data[COS_MAX];
+                sysctl->u.psr_cat_op.u.l3_info.flags   = data[PSR_FLAG];
+            } else {
+                /*
+                 * Check if CDP is enabled.
+                 *
+                 * Per spec, L3 CAT and CDP cannot co-exist. So, we need 
replace
+                 * output values to CDP's if it is enabled.
+                 */
+                ret = psr_get_info(sysctl->u.psr_cat_op.target,
+                               PSR_CBM_TYPE_L3_CODE, data, 3);
+                if ( !ret )
+                {
+                    sysctl->u.psr_cat_op.u.l3_info.cbm_len = data[CBM_LEN];
+                    sysctl->u.psr_cat_op.u.l3_info.cos_max = data[COS_MAX];
+                    sysctl->u.psr_cat_op.u.l3_info.flags   = data[PSR_FLAG];
+                }
+            }
 
             if ( !ret && __copy_field_to_guest(u_sysctl, sysctl, u.psr_cat_op) 
)
                 ret = -EFAULT;
-- 
1.9.1


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