[Xen-devel] [PATCH RESEND v5 07/24] x86: refactor psr: implement get value flow.

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

This patch implements get value flow including L3 CAT callback
function.

It also changes domctl interface to make it more general.

With this patch, 'psr-cat-show' can work for L3 CAT.

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
v5:
    - rename 'dat[]' to 'data[]'
    - modify variables names to make them better, e.g. 'feat_tmp' to 'feat'.
    - check if feature type match in caller of feature callback function.
---
 xen/arch/x86/domctl.c     | 18 +++++++++---------
 xen/arch/x86/psr.c        | 41 ++++++++++++++++++++++++++++++++++++++---
 xen/include/asm-x86/psr.h |  4 ++--
 3 files changed, 49 insertions(+), 14 deletions(-)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index ab141b1..11d2127 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -1383,23 +1383,23 @@ long arch_do_domctl(
             break;
 
         case XEN_DOMCTL_PSR_CAT_OP_GET_L3_CBM:
-            ret = psr_get_l3_cbm(d, domctl->u.psr_cat_op.target,
-                                 &domctl->u.psr_cat_op.data,
-                                 PSR_CBM_TYPE_L3);
+            ret = psr_get_val(d, domctl->u.psr_cat_op.target,
+                              &domctl->u.psr_cat_op.data,
+                              PSR_CBM_TYPE_L3);
             copyback = 1;
             break;
 
         case XEN_DOMCTL_PSR_CAT_OP_GET_L3_CODE:
-            ret = psr_get_l3_cbm(d, domctl->u.psr_cat_op.target,
-                                 &domctl->u.psr_cat_op.data,
-                                 PSR_CBM_TYPE_L3_CODE);
+            ret = psr_get_val(d, domctl->u.psr_cat_op.target,
+                              &domctl->u.psr_cat_op.data,
+                              PSR_CBM_TYPE_L3_CODE);
             copyback = 1;
             break;
 
         case XEN_DOMCTL_PSR_CAT_OP_GET_L3_DATA:
-            ret = psr_get_l3_cbm(d, domctl->u.psr_cat_op.target,
-                                 &domctl->u.psr_cat_op.data,
-                                 PSR_CBM_TYPE_L3_DATA);
+            ret = psr_get_val(d, domctl->u.psr_cat_op.target,
+                              &domctl->u.psr_cat_op.data,
+                              PSR_CBM_TYPE_L3_DATA);
             copyback = 1;
             break;
 
diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 319bfcc..3cbb60c 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -112,6 +112,9 @@ struct feat_ops {
     /* get_feat_info is used to get feature HW info. */
     bool (*get_feat_info)(const struct feat_node *feat,
                           uint32_t data[], unsigned int array_len);
+    /* get_val is used to get feature COS register value. */
+    bool (*get_val)(const struct feat_node *feat, unsigned int cos,
+                    enum cbm_type type, uint64_t *val);
 };
 
 /*
@@ -251,9 +254,22 @@ static bool l3_cat_get_feat_info(const struct feat_node 
*feat,
     return true;
 }
 
+static bool l3_cat_get_val(const struct feat_node *feat, unsigned int cos,
+                           enum cbm_type type, uint64_t *val)
+{
+    if ( cos > feat->info.l3_cat_info.cos_max )
+        /* Use default value. */
+        cos = 0;
+
+    *val =  feat->cos_reg_val[cos];
+
+    return true;
+}
+
 static const struct feat_ops l3_cat_ops = {
     .get_cos_max = l3_cat_get_cos_max,
     .get_feat_info = l3_cat_get_feat_info,
+    .get_val = l3_cat_get_val,
 };
 
 static void __init parse_psr_bool(char *s, char *value, char *feature,
@@ -498,10 +514,29 @@ int psr_get_info(unsigned int socket, enum cbm_type type,
     return -ENOENT;
 }
 
-int psr_get_l3_cbm(struct domain *d, unsigned int socket,
-                   uint64_t *cbm, enum cbm_type type)
+int psr_get_val(struct domain *d, unsigned int socket,
+                uint64_t *val, enum cbm_type type)
 {
-    return 0;
+    const struct psr_socket_info *info = get_socket_info(socket);
+    unsigned int cos = d->arch.psr_cos_ids[socket];
+    const struct feat_node *feat;
+    enum psr_feat_type feat_type;
+
+    if ( IS_ERR(info) )
+        return PTR_ERR(info);
+
+    feat_type = psr_cbm_type_to_feat_type(type);
+    list_for_each_entry(feat, &info->feat_list, list)
+    {
+        if ( feat->feature != feat_type )
+            continue;
+
+        if ( feat->ops.get_val(feat, cos, type, val) )
+            /* Found */
+            return 0;
+    }
+
+    return -ENOENT;
 }
 
 int psr_set_l3_cbm(struct domain *d, unsigned int socket,
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index e3b18bc..d50e359 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -70,8 +70,8 @@ void psr_ctxt_switch_to(struct domain *d);
 
 int psr_get_info(unsigned int socket, enum cbm_type type,
                  uint32_t data[], unsigned int array_len);
-int psr_get_l3_cbm(struct domain *d, unsigned int socket,
-                   uint64_t *cbm, enum cbm_type type);
+int psr_get_val(struct domain *d, unsigned int socket,
+                uint64_t *val, enum cbm_type type);
 int psr_set_l3_cbm(struct domain *d, unsigned int socket,
                    uint64_t cbm, enum cbm_type type);
 
-- 
1.9.1


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