[Xen-devel] [PATCH v6 06/16] x86: implement get hw info flow for MBA

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

This patch implements get HW info flow for MBA including its callback
function and sysctl interface.

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>

v5:
    - use ASSERT in 'mba_get_feat_info'.
      (suggested by Roger Pau Monné)
    - correct initialization format of 'data[PSR_INFO_ARRAY_SIZE]'.
      (suggested by Roger Pau Monné and Jan Beulich)
v4:
    - remove 'ALLOC_' from macro names.
      (suggested by Roger Pau Monné)
    - initialize 'data[PSR_INFO_ARRAY_SIZE]' to 0 to prevent to leak stack data.
      (suggested by Roger Pau Monné)
v3:
    - replace 'PSR_VAL_TYPE_MBA' to 'PSR_TYPE_MBA_THRTL'.
      (suggested by Roger Pau Monné)
v2:
    - use 'XEN_SYSCTL_PSR_MBA_LINEAR' to set MBA feature HW info.
      (suggested by Chao Peng)
v1:
    - sort 'PSR_INFO_IDX_' macros as feature.
      (suggested by Chao Peng)
    - rename 'PSR_INFO_IDX_MBA_LINEAR' to 'PSR_INFO_IDX_MBA_FLAG'.
    - rename 'linear' in 'struct mba_info' to 'flags' for future extension.
      (suggested by Chao Peng)
---
 xen/arch/x86/psr.c          | 14 +++++++++++++-
 xen/arch/x86/sysctl.c       | 21 ++++++++++++++++++++-
 xen/include/asm-x86/psr.h   |  2 ++
 xen/include/public/sysctl.h |  8 ++++++++
 4 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 157e11f..03f24c0 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -263,6 +263,10 @@ static enum psr_feat_type psr_type_to_feat_type(enum 
psr_type type)
         feat_type = FEAT_TYPE_L2_CAT;
         break;
 
+    case PSR_TYPE_MBA_THRTL:
+        feat_type = FEAT_TYPE_MBA;
+        break;
+
     default:
         ASSERT_UNREACHABLE();
     }
@@ -483,7 +487,15 @@ static const struct feat_props l2_cat_props = {
 static bool mba_get_feat_info(const struct feat_node *feat,
                               uint32_t data[], unsigned int array_len)
 {
-    return false;
+    ASSERT(array_len == PSR_INFO_ARRAY_SIZE);
+
+    data[PSR_INFO_IDX_COS_MAX] = feat->cos_max;
+    data[PSR_INFO_IDX_MBA_THRTL_MAX] = feat->mba.thrtl_max;
+
+    if ( feat->mba.linear )
+        data[PSR_INFO_IDX_MBA_FLAG] |= XEN_SYSCTL_PSR_MBA_LINEAR;
+
+    return true;
 }
 
 static void mba_write_msr(unsigned int cos, uint32_t val,
diff --git a/xen/arch/x86/sysctl.c b/xen/arch/x86/sysctl.c
index 6867ee1..f48d6fd 100644
--- a/xen/arch/x86/sysctl.c
+++ b/xen/arch/x86/sysctl.c
@@ -174,7 +174,7 @@ long arch_do_sysctl(
     case XEN_SYSCTL_psr_alloc:
         switch ( sysctl->u.psr_alloc.cmd )
         {
-            uint32_t data[PSR_INFO_ARRAY_SIZE];
+            uint32_t data[PSR_INFO_ARRAY_SIZE] = { };
 
         case XEN_SYSCTL_PSR_get_l3_info:
         {
@@ -214,6 +214,25 @@ long arch_do_sysctl(
             break;
         }
 
+        case XEN_SYSCTL_PSR_get_mba_info:
+        {
+            ret = psr_get_info(sysctl->u.psr_alloc.target,
+                               PSR_TYPE_MBA_THRTL, data, ARRAY_SIZE(data));
+            if ( ret )
+                break;
+
+            sysctl->u.psr_alloc.u.mba_info.cos_max =
+                                      data[PSR_INFO_IDX_COS_MAX];
+            sysctl->u.psr_alloc.u.mba_info.thrtl_max =
+                                      data[PSR_INFO_IDX_MBA_THRTL_MAX];
+            sysctl->u.psr_alloc.u.mba_info.flags =
+                                      data[PSR_INFO_IDX_MBA_FLAG];
+
+            if ( __copy_field_to_guest(u_sysctl, sysctl, u.psr_alloc) )
+                ret = -EFAULT;
+            break;
+        }
+
         default:
             ret = -EOPNOTSUPP;
             break;
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index 9d14264..084ae97 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -39,6 +39,8 @@
 #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_IDX_MBA_THRTL_MAX      1
+#define PSR_INFO_IDX_MBA_FLAG           2
 #define PSR_INFO_ARRAY_SIZE             3
 
 struct psr_cmt_l3 {
diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h
index a50e345..f7f26c3 100644
--- a/xen/include/public/sysctl.h
+++ b/xen/include/public/sysctl.h
@@ -698,6 +698,7 @@ struct xen_sysctl_pcitopoinfo {
 
 #define XEN_SYSCTL_PSR_get_l3_info               0
 #define XEN_SYSCTL_PSR_get_l2_info               1
+#define XEN_SYSCTL_PSR_get_mba_info              2
 struct xen_sysctl_psr_alloc {
     uint32_t cmd;       /* IN: XEN_SYSCTL_PSR_* */
     uint32_t target;    /* IN */
@@ -708,6 +709,13 @@ struct xen_sysctl_psr_alloc {
 #define XEN_SYSCTL_PSR_CAT_L3_CDP       (1u << 0)
             uint32_t flags;     /* OUT: CAT flags */
         } cat_info;
+
+        struct {
+            uint32_t thrtl_max; /* OUT: Maximum throttle */
+            uint32_t cos_max;   /* OUT: Maximum COS */
+#define XEN_SYSCTL_PSR_MBA_LINEAR      (1u << 0)
+            uint32_t flags;     /* OUT: MBA flags */
+        } mba_info;
     } u;
 };
 
-- 
1.9.1


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