[Xen-devel] [RFC 06/16] x86: implement init flow for MBA.

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

This patch implements init flow for MBA including its callback
functions.

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
 xen/arch/x86/psr.c        | 83 ++++++++++++++++++++++++++++++++++++++++++++++-
 xen/include/asm-x86/psr.h |  1 +
 2 files changed, 83 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index eca9c43..e2ca6fb 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -41,6 +41,7 @@
 #define CAT_CBM_LEN_MASK 0x1f
 #define CAT_COS_MAX_MASK 0xffff
 
+#define MBA_THRTL_MAX_MASK 0xfff
 /* Linear bit. */
 #define MBA_LINEAR     (1<<2)
 
@@ -265,6 +266,7 @@ static DEFINE_PER_CPU(struct psr_assoc, psr_assoc);
 static struct feat_node *feat_l3_cat;
 static struct feat_node *feat_l3_cdp;
 static struct feat_node *feat_l2_cat;
+static struct feat_node *feat_mba;
 
 /* Common functions. */
 static void free_feature(struct psr_socket_info *info)
@@ -299,6 +301,12 @@ static void free_feature(struct psr_socket_info *info)
         xfree(feat_l2_cat);
         feat_l2_cat = NULL;
     }
+
+    if ( feat_mba )
+    {
+        xfree(feat_mba);
+        feat_mba = NULL;
+    }
 }
 
 static bool_t psr_check_cbm(unsigned int cbm_len, uint64_t cbm)
@@ -934,6 +942,53 @@ struct feat_ops l2_cat_ops = {
     .write_msr = l2_cat_write_msr,
 };
 
+/* MBA callback functions implementation. */
+static void mba_init_feature(unsigned int eax, unsigned int ebx,
+                             unsigned int ecx, unsigned int edx,
+                             struct feat_node *feat,
+                             struct psr_socket_info *info)
+{
+    struct psr_mba_hw_info mba_info;
+    unsigned int socket;
+
+    /* No valid values so do not enable the feature. */
+    if ( !eax || !edx )
+        return;
+
+    mba_info.thrtl_max = (eax & 0xfff) + 1;
+    mba_info.cos_max = min(opt_cos_max, edx & CAT_COS_MAX_MASK);
+    if ( ecx & MBA_LINEAR )
+        mba_info.linear = 1;
+
+    /* cos=0 is reserved as default thrtl(0), the max bandwidth. */
+    feat->cos_reg_val[0] = 0;
+
+    feat->feature = PSR_SOCKET_MBA;
+    __set_bit(PSR_SOCKET_MBA, &info->feat_mask);
+
+    feat->info.mba_info = mba_info;
+
+    info->nr_feat++;
+
+    /* Add this feature into list. */
+    list_add_tail(&feat->list, &info->feat_list);
+
+    socket = cpu_to_socket(smp_processor_id());
+    printk(XENLOG_INFO "MBA: enabled on socket %u, cos_max:%u, thrtl_max:%u, 
linear:%u.\n",
+           socket, feat->info.mba_info.cos_max,
+           feat->info.mba_info.thrtl_max, feat->info.mba_info.linear);
+}
+
+static unsigned int mba_get_max_cos_max(const struct feat_node *feat)
+{
+    return feat->info.mba_info.cos_max;
+}
+
+struct feat_ops mba_ops = {
+    .init_feature = mba_init_feature,
+    .get_max_cos_max = mba_get_max_cos_max,
+};
+
 static void __init parse_psr_bool(char *s, char *value, char *feature,
                                   unsigned int mask)
 {
@@ -1659,6 +1714,20 @@ static int cpu_prepare_work(unsigned int cpu)
         return -ENOMEM;
     }
 
+    if ( feat_mba == NULL &&
+         (feat_mba = xzalloc(struct feat_node)) == NULL )
+    {
+        xfree(feat_l3_cat);
+        feat_l3_cat = NULL;
+
+        xfree(feat_l3_cdp);
+        feat_l3_cdp = NULL;
+
+        xfree(feat_l2_cat);
+        feat_l2_cat = NULL;
+        return -ENOMEM;
+    }
+
     return 0;
 }
 
@@ -1712,6 +1781,18 @@ static void cpu_init_work(void)
         feat_tmp->ops = l2_cat_ops;
         feat_tmp->ops.init_feature(eax, ebx, ecx, edx, feat_tmp, info);
     }
+
+    cpuid_count(PSR_CPUID_LEVEL_CAT, 0, &eax, &ebx, &ecx, &edx);
+    if ( ebx & PSR_RESOURCE_TYPE_MBA )
+    {
+        feat_tmp = feat_mba;
+        feat_mba = NULL;
+
+        /* Initialize MBA according to CPUID. */
+        cpuid_count(PSR_CPUID_LEVEL_CAT, 3, &eax, &ebx, &ecx, &edx);
+        feat_tmp->ops = mba_ops;
+        feat_tmp->ops.init_feature(eax, ebx, ecx, edx, feat_tmp, info);
+    }
 }
 
 static void cpu_fini_work(unsigned int cpu)
@@ -1817,7 +1898,7 @@ static int __init psr_presmp_init(void)
     if ( (opt_psr & PSR_CMT) && opt_rmid_max )
         init_psr_cmt(opt_rmid_max);
 
-    if ( opt_psr & PSR_CAT )
+    if ( opt_psr & (PSR_CAT | PSR_MBA) )
         init_psr();
 
     if ( psr_cpu_prepare(0) )
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index 4d52918..9dd7782 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -24,6 +24,7 @@
 /* Resource Type Enumeration */
 #define PSR_RESOURCE_TYPE_L3            0x2
 #define PSR_RESOURCE_TYPE_L2            0x4
+#define PSR_RESOURCE_TYPE_MBA           0x8
 
 /* L3 Monitoring Features */
 #define PSR_CMT_L3_OCCUPANCY           0x1
-- 
1.9.1


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