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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC v2 04/12] x86: implement data structure and CPU init flow for MBA.
This patch implements main data structures of MBA.
Like CAT features, MBA HW info has cos_max which means the max cos
registers number, and thrtl_max which means the max throttle value
(delay value). It also has a flag to represent if the throttle
value is linear or not.
One COS register of MBA stores a throttle value for one or more
domains. The throttle value means the transaction time between L2
cache and next level memory to be delayed.
This patch also implements init flow for MBA and register stub
callback functions.
Signed-off-by: Yi Sun <yi.y.sun@xxxxxxxxxxxxxxx>
---
xen/arch/x86/psr.c | 130 ++++++++++++++++++++++++++++++++--------
xen/include/asm-x86/msr-index.h | 1 +
xen/include/asm-x86/psr.h | 2 +
3 files changed, 109 insertions(+), 24 deletions(-)
diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c
index d1d854f..d1ea5a4 100644
--- a/xen/arch/x86/psr.c
+++ b/xen/arch/x86/psr.c
@@ -27,13 +27,16 @@
* - CMT Cache Monitoring Technology
* - COS/CLOS Class of Service. Also mean COS registers.
* - COS_MAX Max number of COS for the feature (minus 1)
+ * - MBA Memory Bandwidth Allocation
* - MSRs Machine Specific Registers
* - PSR Intel Platform Shared Resource
+ * - THRTL_MAX Max throttle value (delay value) of MBA
*/
#define PSR_CMT (1<<0)
#define PSR_CAT (1<<1)
#define PSR_CDP (1<<2)
+#define PSR_MBA (1<<3)
#define CAT_CBM_LEN_MASK 0x1f
#define CAT_COS_MAX_MASK 0xffff
@@ -60,10 +63,14 @@
*/
#define MAX_COS_NUM 2
+#define MBA_LINEAR (1<<2)
+#define MBA_THRTL_MAX_MASK 0xfff
+
enum psr_feat_type {
FEAT_TYPE_L3_CAT,
FEAT_TYPE_L3_CDP,
FEAT_TYPE_L2_CAT,
+ FEAT_TYPE_MBA,
FEAT_TYPE_NUM,
FEAT_TYPE_UNKNOWN,
};
@@ -71,7 +78,6 @@ enum psr_feat_type {
/*
* This structure represents one feature.
* cos_max - The max COS registers number got through CPUID.
- * cbm_len - The length of CBM got through CPUID.
* cos_reg_val - Array to store the values of COS registers. One entry stores
* the value of one COS register.
* For L3 CAT and L2 CAT, one entry corresponds to one COS_ID.
@@ -80,9 +86,21 @@ enum psr_feat_type {
* cos_reg_val[1] (Code).
*/
struct feat_node {
- /* cos_max and cbm_len are common values for all features so far. */
+ /* cos_max is common values for all features so far. */
unsigned int cos_max;
- unsigned int cbm_len;
+
+ /* Feature specific HW info. */
+ union {
+ struct {
+ unsigned int cbm_len;
+ } cat_info;
+
+ struct {
+ unsigned int thrtl_max;
+ unsigned int linear;
+ } mba_info;
+ };
+
uint32_t cos_reg_val[MAX_COS_REG_CNT];
};
@@ -161,6 +179,7 @@ static DEFINE_PER_CPU(struct psr_assoc, psr_assoc);
*/
static struct feat_node *feat_l3;
static struct feat_node *feat_l2_cat;
+static struct feat_node *feat_mba;
/* Common functions */
#define cat_default_val(len) (0xffffffff >> (32 - (len)))
@@ -274,22 +293,22 @@ static bool psr_check_cbm(unsigned int cbm_len, unsigned
long cbm)
}
/* CAT common functions implementation. */
-static int cat_init_feature(const struct cpuid_leaf *regs,
- struct feat_node *feat,
- struct psr_socket_info *info,
- enum psr_feat_type type)
+static int init_alloc_features(const struct cpuid_leaf *regs,
+ struct feat_node *feat,
+ struct psr_socket_info *info,
+ enum psr_feat_type type)
{
- const char * const cat_feat_name[FEAT_TYPE_NUM] = {
+ const char * const feat_name[FEAT_TYPE_NUM] = {
"L3 CAT",
"CDP",
"L2 CAT",
+ "MBA",
};
/* No valid value so do not enable feature. */
if ( !regs->a || !regs->d )
return -ENOENT;
- feat->cbm_len = (regs->a & CAT_CBM_LEN_MASK) + 1;
feat->cos_max = min(opt_cos_max, regs->d & CAT_COS_MAX_MASK);
switch ( type )
@@ -299,13 +318,15 @@ static int cat_init_feature(const struct cpuid_leaf *regs,
if ( feat->cos_max < 1 )
return -ENOENT;
+ feat->cat_info.cbm_len = (regs->a & CAT_CBM_LEN_MASK) + 1;
+
/* We reserve cos=0 as default cbm (all bits within cbm_len are 1). */
- feat->cos_reg_val[0] = cat_default_val(feat->cbm_len);
+ feat->cos_reg_val[0] = cat_default_val(feat->cat_info.cbm_len);
wrmsrl((type == FEAT_TYPE_L3_CAT ?
MSR_IA32_PSR_L3_MASK(0) :
MSR_IA32_PSR_L2_MASK(0)),
- cat_default_val(feat->cbm_len));
+ cat_default_val(feat->cat_info.cbm_len));
break;
@@ -316,15 +337,19 @@ static int cat_init_feature(const struct cpuid_leaf *regs,
if ( feat->cos_max < 3 )
return -ENOENT;
+ feat->cat_info.cbm_len = (regs->a & CAT_CBM_LEN_MASK) + 1;
+
/* Cut half of cos_max when CDP is enabled. */
feat->cos_max = (feat->cos_max - 1) >> 1;
/* We reserve cos=0 as default cbm (all bits within cbm_len are 1). */
- get_cdp_code(feat, 0) = cat_default_val(feat->cbm_len);
- get_cdp_data(feat, 0) = cat_default_val(feat->cbm_len);
+ get_cdp_code(feat, 0) = cat_default_val(feat->cat_info.cbm_len);
+ get_cdp_data(feat, 0) = cat_default_val(feat->cat_info.cbm_len);
- wrmsrl(MSR_IA32_PSR_L3_MASK(0), cat_default_val(feat->cbm_len));
- wrmsrl(MSR_IA32_PSR_L3_MASK(1), cat_default_val(feat->cbm_len));
+ wrmsrl(MSR_IA32_PSR_L3_MASK(0),
+ cat_default_val(feat->cat_info.cbm_len));
+ wrmsrl(MSR_IA32_PSR_L3_MASK(1),
+ cat_default_val(feat->cat_info.cbm_len));
rdmsrl(MSR_IA32_PSR_L3_QOS_CFG, val);
wrmsrl(MSR_IA32_PSR_L3_QOS_CFG,
val | (1ull << PSR_L3_QOS_CDP_ENABLE_BIT));
@@ -332,6 +357,20 @@ static int cat_init_feature(const struct cpuid_leaf *regs,
break;
}
+ case FEAT_TYPE_MBA:
+ if ( feat->cos_max < 1 )
+ return -ENOENT;
+
+ feat->mba_info.thrtl_max = (regs->a & MBA_THRTL_MAX_MASK) + 1;
+
+ if ( regs->c & MBA_LINEAR )
+ feat->mba_info.linear = 1;
+
+ feat->cos_reg_val[0] = 0;
+ wrmsrl(MSR_IA32_PSR_MBA_MASK(0), 0);
+
+ break;
+
default:
return -ENOENT;
}
@@ -342,9 +381,14 @@ static int cat_init_feature(const struct cpuid_leaf *regs,
if ( !opt_cpu_info )
return 0;
- printk(XENLOG_INFO "%s: enabled on socket %u, cos_max:%u, cbm_len:%u\n",
- cat_feat_name[type], cpu_to_socket(smp_processor_id()),
- feat->cos_max, feat->cbm_len);
+ if ( type == FEAT_TYPE_MBA )
+ printk(XENLOG_INFO "%s: enabled on socket %u, cos_max:%u,
thrtl_max:%u, linear:%u.\n",
+ feat_name[type], cpu_to_socket(smp_processor_id()),
+ feat->cos_max, feat->mba_info.thrtl_max, feat->mba_info.linear);
+ else
+ printk(XENLOG_INFO "%s: enabled on socket %u, cos_max:%u,
cbm_len:%u\n",
+ feat_name[type], cpu_to_socket(smp_processor_id()),
+ feat->cos_max, feat->cat_info.cbm_len);
return 0;
}
@@ -356,7 +400,7 @@ static bool cat_get_feat_info(const struct feat_node *feat,
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_CBM_LEN] = feat->cat_info.cbm_len;
data[PSR_INFO_IDX_CAT_FLAG] = 0;
return true;
@@ -422,6 +466,26 @@ static const struct feat_props l2_cat_props = {
.write_msr = l2_cat_write_msr,
};
+/* MBA props */
+static bool mba_get_feat_info(const struct feat_node *feat,
+ uint32_t data[], unsigned int array_len)
+{
+ return false;
+}
+
+static void mba_write_msr(unsigned int cos, uint32_t val,
+ enum psr_val_type type)
+{
+}
+
+static const struct feat_props mba_props = {
+ .cos_num = 1,
+ .type[0] = PSR_VAL_TYPE_MBA,
+ .alt_type = PSR_VAL_TYPE_UNKNOWN,
+ .get_feat_info = mba_get_feat_info,
+ .write_msr = mba_write_msr,
+};
+
static void __init parse_psr_bool(char *s, char *value, char *feature,
unsigned int mask)
{
@@ -457,6 +521,7 @@ static void __init parse_psr_param(char *s)
parse_psr_bool(s, val_str, "cmt", PSR_CMT);
parse_psr_bool(s, val_str, "cat", PSR_CAT);
parse_psr_bool(s, val_str, "cdp", PSR_CDP);
+ parse_psr_bool(s, val_str, "mba", PSR_MBA);
if ( val_str && !strcmp(s, "rmid_max") )
opt_rmid_max = simple_strtoul(val_str, NULL, 0);
@@ -863,7 +928,7 @@ static int insert_val_into_array(uint32_t val[],
if ( array_len < props->cos_num )
return -ENOSPC;
- if ( !psr_check_cbm(feat->cbm_len, new_val) )
+ if ( !psr_check_cbm(feat->cat_info.cbm_len, new_val) )
return -EINVAL;
/*
@@ -1380,6 +1445,10 @@ static int psr_cpu_prepare(void)
(feat_l2_cat = xzalloc(struct feat_node)) == NULL )
return -ENOMEM;
+ if ( feat_mba == NULL &&
+ (feat_mba = xzalloc(struct feat_node)) == NULL )
+ return -ENOMEM;
+
return 0;
}
@@ -1416,7 +1485,7 @@ static void psr_cpu_init(void)
if ( (regs.c & PSR_CAT_CDP_CAPABILITY) && (opt_psr & PSR_CDP) )
{
- if ( !cat_init_feature(®s, feat, info, FEAT_TYPE_L3_CDP) )
+ if ( !init_alloc_features(®s, feat, info, FEAT_TYPE_L3_CDP) )
feat_props[FEAT_TYPE_L3_CDP] = &l3_cdp_props;
else
/* If CDP init fails, try to work as L3 CAT. */
@@ -1425,7 +1494,7 @@ static void psr_cpu_init(void)
else
{
l3_cat_init:
- if ( !cat_init_feature(®s, feat, info, FEAT_TYPE_L3_CAT) )
+ if ( !init_alloc_features(®s, feat, info, FEAT_TYPE_L3_CAT) )
feat_props[FEAT_TYPE_L3_CAT] = &l3_cat_props;
else
feat_l3 = feat;
@@ -1439,12 +1508,25 @@ static void psr_cpu_init(void)
feat = feat_l2_cat;
feat_l2_cat = NULL;
- if ( !cat_init_feature(®s, feat, info, FEAT_TYPE_L2_CAT) )
+ if ( !init_alloc_features(®s, feat, info, FEAT_TYPE_L2_CAT) )
feat_props[FEAT_TYPE_L2_CAT] = &l2_cat_props;
else
feat_l2_cat = feat;
}
+ cpuid_count_leaf(PSR_CPUID_LEVEL_CAT, 0, ®s);
+ if ( regs.b & PSR_RESOURCE_TYPE_MBA )
+ {
+ cpuid_count_leaf(PSR_CPUID_LEVEL_CAT, 3, ®s);
+
+ feat = feat_mba;
+ feat_mba = NULL;
+ if ( !init_alloc_features(®s, feat, info, FEAT_TYPE_MBA) )
+ feat_props[FEAT_TYPE_MBA] = &mba_props;
+ else
+ feat_mba = feat;
+ }
+
info->feat_init = true;
assoc_init:
@@ -1504,7 +1586,7 @@ 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 | PSR_CDP) )
+ if ( opt_psr & (PSR_CAT | PSR_CDP | PSR_MBA) )
init_psr();
if ( psr_cpu_prepare() )
diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index 4e08de6..41f1677 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -348,6 +348,7 @@
#define MSR_IA32_PSR_L3_MASK_CODE(n) (0x00000c90 + (n) * 2 + 1)
#define MSR_IA32_PSR_L3_MASK_DATA(n) (0x00000c90 + (n) * 2)
#define MSR_IA32_PSR_L2_MASK(n) (0x00000d10 + (n))
+#define MSR_IA32_PSR_MBA_MASK(n) (0x00000d50 + (n))
/* Intel Model 6 */
#define MSR_P6_PERFCTR(n) (0x000000c1 + (n))
diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h
index 1b6f22f..551ccf3 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
@@ -58,6 +59,7 @@ enum psr_val_type {
PSR_VAL_TYPE_L3_CODE,
PSR_VAL_TYPE_L3_DATA,
PSR_VAL_TYPE_L2,
+ PSR_VAL_TYPE_MBA,
PSR_VAL_TYPE_UNKNOWN,
};
--
1.9.1
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