[xen master] x86: refactor psr: L3 CAT: implement get hw info flow.

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[xen master] x86: refactor psr: L3 CAT: implement get hw info flow.

patchbot
commit dba2b703962b4446cd7db1877caba0d43b87d2a1
Author:     Yi Sun <[hidden email]>
AuthorDate: Tue Aug 1 11:04:00 2017 +0200
Commit:     Jan Beulich <[hidden email]>
CommitDate: Thu Aug 3 12:33:03 2017 +0200

    x86: refactor psr: L3 CAT: implement get hw info flow.
   
    This patch implements get HW info flow including L3 CAT callback
    function.
   
    It also changes sysctl interface to make it more general.
   
    With this patch, 'psr-hwinfo' can work for L3 CAT.
   
    Signed-off-by: Yi Sun <[hidden email]>
    Reviewed-by: Jan Beulich <[hidden email]>
---
 xen/arch/x86/psr.c        | 81 +++++++++++++++++++++++++++++++++++++++++++++--
 xen/arch/x86/sysctl.c     | 19 ++++++++---
 xen/include/asm-x86/psr.h | 16 +++++++---
 3 files changed, 104 insertions(+), 12 deletions(-)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 91bb1f0..20d083e 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -63,6 +63,7 @@
 enum psr_feat_type {
     FEAT_TYPE_L3_CAT,
     FEAT_TYPE_NUM,
+    FEAT_TYPE_UNKNOWN,
 };
 
 /*
@@ -108,6 +109,10 @@ static const struct feat_props {
      * feature does some special operations.
      */
     enum cbm_type alt_type;
+
+    /* get_feat_info is used to return feature HW info through sysctl. */
+    bool (*get_feat_info)(const struct feat_node *feat,
+                          uint32_t data[], unsigned int array_len);
 } *feat_props[FEAT_TYPE_NUM];
 
 /*
@@ -184,6 +189,22 @@ static void free_socket_resources(unsigned int socket)
     memset(info->cos_ref, 0, MAX_COS_REG_CNT * sizeof(unsigned int));
 }
 
+static enum psr_feat_type psr_cbm_type_to_feat_type(enum cbm_type type)
+{
+    enum psr_feat_type feat_type = FEAT_TYPE_UNKNOWN;
+
+    switch ( type )
+    {
+    case PSR_CBM_TYPE_L3:
+        feat_type = FEAT_TYPE_L3_CAT;
+        break;
+    default:
+        ASSERT_UNREACHABLE();
+    }
+
+    return feat_type;
+}
+
 /* CAT common functions implementation. */
 static int cat_init_feature(const struct cpuid_leaf *regs,
                             struct feat_node *feat,
@@ -226,11 +247,25 @@ static int cat_init_feature(const struct cpuid_leaf *regs,
     return 0;
 }
 
+static bool cat_get_feat_info(const struct feat_node *feat,
+                              uint32_t data[], unsigned int array_len)
+{
+    if ( array_len != PSR_INFO_ARRAY_SIZE )
+        return false;
+
+    data[PSR_INFO_IDX_COS_MAX] = feat->cos_max;
+    data[PSR_INFO_IDX_CAT_CBM_LEN] = feat->cbm_len;
+    data[PSR_INFO_IDX_CAT_FLAG] = 0;
+
+    return true;
+}
+
 /* L3 CAT props */
 static const struct feat_props l3_cat_props = {
     .cos_num = 1,
     .type[0] = PSR_CBM_TYPE_L3,
     .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,
@@ -443,10 +478,50 @@ void psr_ctxt_switch_to(struct domain *d)
     }
 }
 
-int psr_get_cat_l3_info(unsigned int socket, uint32_t *cbm_len,
-                        uint32_t *cos_max, uint32_t *flags)
+static struct psr_socket_info *get_socket_info(unsigned int socket)
 {
-    return 0;
+    if ( !socket_info )
+        return ERR_PTR(-ENODEV);
+
+    if ( socket >= nr_sockets )
+        return ERR_PTR(-ERANGE);
+
+    if ( !socket_info[socket].feat_init )
+        return ERR_PTR(-ENOENT);
+
+    return socket_info + socket;
+}
+
+int psr_get_info(unsigned int socket, enum cbm_type type,
+                 uint32_t data[], unsigned int array_len)
+{
+    const struct psr_socket_info *info = get_socket_info(socket);
+    const struct feat_node *feat;
+    enum psr_feat_type feat_type;
+
+    ASSERT(data);
+
+    if ( IS_ERR(info) )
+        return PTR_ERR(info);
+
+    feat_type = psr_cbm_type_to_feat_type(type);
+    if ( feat_type >= ARRAY_SIZE(info->features) )
+        return -ENOENT;
+
+    feat = info->features[feat_type];
+    if ( !feat )
+        return -ENOENT;
+
+    if ( !feat_props[feat_type] )
+    {
+        ASSERT_UNREACHABLE();
+        return -ENOENT;
+    }
+
+    if ( feat_props[feat_type]->get_feat_info(feat, data, array_len) )
+        return 0;
+
+    return -EINVAL;
 }
 
 int psr_get_l3_cbm(struct domain *d, unsigned int socket,
diff --git a/xen/arch/x86/sysctl.c b/xen/arch/x86/sysctl.c
index 7c294be..a92384b 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -175,14 +175,25 @@ long arch_do_sysctl(
         switch ( sysctl->u.psr_cat_op.cmd )
         {
         case XEN_SYSCTL_PSR_CAT_get_l3_info:
-            ret = psr_get_cat_l3_info(sysctl->u.psr_cat_op.target,
-                                      &sysctl->u.psr_cat_op.u.l3_info.cbm_len,
-                                      &sysctl->u.psr_cat_op.u.l3_info.cos_max,
-                                      &sysctl->u.psr_cat_op.u.l3_info.flags);
+        {
+            uint32_t data[PSR_INFO_ARRAY_SIZE];
+
+            ret = psr_get_info(sysctl->u.psr_cat_op.target,
+                               PSR_CBM_TYPE_L3, 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;
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index a17e31a..8d15328 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -19,20 +19,26 @@
 #include <xen/types.h>
 
 /* CAT cpuid level */
-#define PSR_CPUID_LEVEL_CAT   0x10
+#define PSR_CPUID_LEVEL_CAT             0x10
 
 /* Resource Type Enumeration */
 #define PSR_RESOURCE_TYPE_L3            0x2
 
 /* L3 Monitoring Features */
-#define PSR_CMT_L3_OCCUPANCY           0x1
+#define PSR_CMT_L3_OCCUPANCY            0x1
 
 /* CDP Capability */
-#define PSR_CAT_CDP_CAPABILITY       (1u << 2)
+#define PSR_CAT_CDP_CAPABILITY          (1u << 2)
 
 /* L3 CDP Enable bit*/
 #define PSR_L3_QOS_CDP_ENABLE_BIT       0x0
 
+/* Used by psr_get_info() */
+#define PSR_INFO_IDX_COS_MAX            0
+#define PSR_INFO_IDX_CAT_CBM_LEN        1
+#define PSR_INFO_IDX_CAT_FLAG           2
+#define PSR_INFO_ARRAY_SIZE             3
+
 struct psr_cmt_l3 {
     unsigned int features;
     unsigned int upscaling_factor;
@@ -64,8 +70,8 @@ int psr_alloc_rmid(struct domain *d);
 void psr_free_rmid(struct domain *d);
 void psr_ctxt_switch_to(struct domain *d);
 
-int psr_get_cat_l3_info(unsigned int socket, uint32_t *cbm_len,
-                        uint32_t *cos_max, uint32_t *flags);
+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_set_l3_cbm(struct domain *d, unsigned int socket,
--
generated by git-patchbot for /home/xen/git/xen.git#master

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