[Xen-devel] [PATCH RESEND v5 17/24] x86: L2 CAT: implement CPU init and free flow.

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

This patch implements the CPU init and free flow for L2 CAT including
L2 CAT initialization callback function.

Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
v5:
    - remove 'feat_l2_cat' free in 'free_feature'.
    - Encapsulate cpuid registers into 'struct cpuid_leaf_regs'.
    - Print socket info when 'opt_cpu_info' is true.
    - rename 'l2_cat_get_max_cos_max' to 'l2_cat_get_cos_max'.
    - rename 'dat[]' to 'data[]'
    - move 'cpu_prepare_work' contents into 'psr_cpu_prepare'.
---
 xen/arch/x86/psr.c        | 72 +++++++++++++++++++++++++++++++++++++++++++++++
 xen/include/asm-x86/psr.h |  1 +
 2 files changed, 73 insertions(+)

diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index 596e5b1..5320ae6 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -94,6 +94,7 @@ struct feat_hw_info {
     union {
         struct psr_cat_hw_info l3_cat_info;
         struct psr_cat_hw_info l3_cdp_info;
+        struct psr_cat_hw_info l2_cat_info;
     };
 };
 
@@ -236,6 +237,7 @@ 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;
 
 /* Common functions. */
 static void free_feature(struct psr_socket_info *info)
@@ -672,6 +674,51 @@ struct feat_ops l3_cdp_ops = {
     .write_msr = l3_cdp_write_msr,
 };
 
+/* L2 CAT callback functions implementation. */
+static void l2_cat_init_feature(struct cpuid_leaf_regs regs,
+                                struct feat_node *feat,
+                                struct psr_socket_info *info)
+{
+    struct psr_cat_hw_info l2_cat;
+    unsigned int socket;
+
+    /* No valid values so do not enable the feature. */
+    if ( !regs.eax || !regs.edx )
+        return;
+
+    l2_cat.cbm_len = (regs.eax & CAT_CBM_LEN_MASK) + 1;
+    l2_cat.cos_max = min(opt_cos_max, regs.edx & CAT_COS_MAX_MASK);
+
+    /* cos=0 is reserved as default cbm(all ones). */
+    feat->cos_reg_val[0] = (1ull << l2_cat.cbm_len) - 1;
+
+    feat->feature = PSR_SOCKET_L2_CAT;
+    __set_bit(PSR_SOCKET_L2_CAT, &info->feat_mask);
+
+    feat->info.l2_cat_info = l2_cat;
+
+    info->nr_feat++;
+
+    /* Add this feature into list. */
+    list_add_tail(&feat->list, &info->feat_list);
+
+    socket = cpu_to_socket(smp_processor_id());
+    if ( opt_cpu_info )
+        printk(XENLOG_INFO
+           "L2 CAT: enabled on socket %u, cos_max:%u, cbm_len:%u.\n",
+           socket, feat->info.l2_cat_info.cos_max,
+           feat->info.l2_cat_info.cbm_len);
+}
+
+static unsigned int l2_cat_get_cos_max(const struct feat_node *feat)
+{
+    return feat->info.l2_cat_info.cos_max;
+}
+
+struct feat_ops l2_cat_ops = {
+    .get_cos_max = l2_cat_get_cos_max,
+};
+
 static void __init parse_psr_bool(char *s, char *value, char *feature,
                                   unsigned int mask)
 {
@@ -1445,6 +1492,20 @@ static void cpu_init_work(void)
             l3_cat_init_feature(regs, feat, info);
         }
     }
+
+    cpuid_count(PSR_CPUID_LEVEL_CAT, 0,
+                &regs.eax, &regs.ebx, &regs.ecx, &regs.edx);
+    if ( regs.ebx & PSR_RESOURCE_TYPE_L2 )
+    {
+        /* Initialize L2 CAT according to CPUID. */
+        cpuid_count(PSR_CPUID_LEVEL_CAT, 2,
+                    &regs.eax, &regs.ebx, &regs.ecx, &regs.edx);
+
+        feat = feat_l2_cat;
+        feat_l2_cat = NULL;
+        feat->ops = l2_cat_ops;
+        l2_cat_init_feature(regs, feat, info);
+    }
 }
 
 static void cpu_fini_work(unsigned int cpu)
@@ -1503,6 +1564,17 @@ static int psr_cpu_prepare(unsigned int cpu)
         return -ENOMEM;
     }
 
+    if ( feat_l2_cat == NULL &&
+         (feat_l2_cat = xzalloc(struct feat_node)) == NULL )
+    {
+        xfree(feat_l3_cat);
+        feat_l3_cat = NULL;
+
+        xfree(feat_l3_cdp);
+        feat_l3_cdp = NULL;
+        return -ENOMEM;
+    }
+
     return 0;
 }
 
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index 97214fe..d2c7a13 100644
--- a/xen/include/asm-x86/psr.h
+++ b/xen/include/asm-x86/psr.h
@@ -23,6 +23,7 @@
 
 /* Resource Type Enumeration */
 #define PSR_RESOURCE_TYPE_L3            0x2
+#define PSR_RESOURCE_TYPE_L2            0x4
 
 /* L3 Monitoring Features */
 #define PSR_CMT_L3_OCCUPANCY           0x1
-- 
1.9.1


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