[Xen-devel] [PATCH v6 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 but not for
L3 code/data which is implemented in patch "x86: refactor psr:
implement get value flow for CDP.".

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
v6:
    - modify commit message to make it clearer.
    - remove one extra space in code.
    - write a helper function to move get info and get val functions into
      it. Because most codes of 'get_info' and 'get_val' are same.
---
 xen/arch/x86/domctl.c     | 18 +++++++++---------
 xen/arch/x86/psr.c        | 43 ++++++++++++++++++++++++++++++++++++++-----
 xen/include/asm-x86/psr.h |  4 ++--
 3 files changed, 49 insertions(+), 16 deletions(-)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 8e5259f..098e399 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -1440,23 +1440,23 @@ 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 d4a9003..0cb9971 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -116,6 +116,9 @@ 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);
 };
 
 /*
@@ -257,9 +260,22 @@ 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,
@@ -479,12 +495,14 @@ static struct psr_socket_info *get_socket_info(unsigned 
int socket)
     return socket_info + socket;
 }
 
-int psr_get_info(unsigned int socket, enum cbm_type type,
-                 uint32_t data[], unsigned int array_len)
+static int __psr_get(unsigned int socket, enum cbm_type type,
+                     uint32_t data[], unsigned int array_len,
+                     struct domain *d, uint64_t *val)
 {
     const struct psr_socket_info *info = get_socket_info(socket);
     const struct feat_node *feat;
     enum psr_feat_type feat_type;
+    unsigned int cos;
 
     if ( IS_ERR(info) )
         return PTR_ERR(info);
@@ -495,6 +513,15 @@ int psr_get_info(unsigned int socket, enum cbm_type type,
         if ( feat->feature != feat_type )
             continue;
 
+        if ( d )
+        {
+            cos = d->arch.psr_cos_ids[socket];
+            if ( feat->ops.get_val(feat, cos, type, val) )
+                return 0;
+            else
+                break;
+        }
+
         if ( feat->ops.get_feat_info(feat, data, array_len) )
             return 0;
         else
@@ -504,10 +531,16 @@ 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_info(unsigned int socket, enum cbm_type type,
+                 uint32_t data[], unsigned int array_len)
+{
+    return __psr_get(socket, type, data, array_len, NULL, NULL);
+}
+
+int psr_get_val(struct domain *d, unsigned int socket,
+                uint64_t *val, enum cbm_type type)
 {
-    return 0;
+    return __psr_get(socket, type, NULL, 0, d, val);
 }
 
 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 0342a80..569e7df 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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