@@ -62,6 +62,7 @@
enum psr_feat_type {
FEAT_TYPE_L3_CAT,
+ FEAT_TYPE_L3_CDP,
FEAT_TYPE_NUM,
FEAT_TYPE_UNKNOWN,
};
@@ -163,6 +164,22 @@ static struct feat_node *feat_l3;
#define cat_default_val(len) (0xffffffff >> (32 - (len)))
/*
+ * get_cdp_data - get DATA COS register value from input COS ID.
+ * @feat: the feature node.
+ * @cos: the COS ID.
+ */
+#define get_cdp_data(feat, cos) \
+ ((feat)->cos_reg_val[(cos) * 2])
+
+/*
+ * get_cdp_code - get CODE COS register value from input COS ID.
+ * @feat: the feature node.
+ * @cos: the COS ID.
+ */
+#define get_cdp_code(feat, cos) \
+ ((feat)->cos_reg_val[(cos) * 2 + 1])
+
+/*
* Use this function to check if any allocation feature has been enabled
* in cmdline.
*/
@@ -262,6 +279,29 @@ static int cat_init_feature(const struct cpuid_leaf *regs,
break;
+ case FEAT_TYPE_L3_CDP:
+ {
+ uint64_t val;
+
+ if ( feat->cos_max < 3 )
+ return -ENOENT;
+
+ /* 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);
+
+ 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));
+ rdmsrl(MSR_IA32_PSR_L3_QOS_CFG, val);
+ wrmsrl(MSR_IA32_PSR_L3_QOS_CFG,
+ val | (1ull << PSR_L3_QOS_CDP_ENABLE_BIT));
+
+ break;
+ }
+
default:
return -ENOENT;
}
@@ -272,7 +312,8 @@ static int cat_init_feature(const struct cpuid_leaf *regs,
if ( !opt_cpu_info )
return 0;
- printk(XENLOG_INFO "CAT: enabled on socket %u, cos_max:%u, cbm_len:%u\n",
+ printk(XENLOG_INFO "%s: enabled on socket %u, cos_max:%u, cbm_len:%u\n",
+ ((type == FEAT_TYPE_L3_CDP) ? "CDP" : "L3 CAT"),
cpu_to_socket(smp_processor_id()), feat->cos_max, feat->cbm_len);
return 0;
@@ -305,6 +346,26 @@ static const struct feat_props l3_cat_props = {
.write_msr = l3_cat_write_msr,
};
+/* L3 CDP props */
+static bool l3_cdp_get_feat_info(const struct feat_node *feat,
+ uint32_t data[], uint32_t array_len)
+{
+ return false;
+}
+
+static void l3_cdp_write_msr(unsigned int cos, uint32_t val, enum cbm_type type)
+{
+}
+
+static const struct feat_props l3_cdp_props = {
+ .cos_num = 2,
+ .type[0] = PSR_CBM_TYPE_L3_DATA,
+ .type[1] = PSR_CBM_TYPE_L3_CODE,
+ .alt_type = PSR_CBM_TYPE_L3,
+ .get_feat_info = l3_cdp_get_feat_info,
+ .write_msr = l3_cdp_write_msr,
+};
+
static void __init parse_psr_bool(char *s, char *value, char *feature,
unsigned int mask)
{
@@ -1283,10 +1344,22 @@ static void psr_cpu_init(void)
feat = feat_l3;
feat_l3 = NULL;
- if ( !cat_init_feature(®s, feat, info, FEAT_TYPE_L3_CAT) )
- feat_props[FEAT_TYPE_L3_CAT] = &l3_cat_props;
+ if ( (regs.c & PSR_CAT_CDP_CAPABILITY) && (opt_psr & PSR_CDP) )
+ {
+ if ( !cat_init_feature(®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. */
+ goto l3_cat_init;
+ }
else
- feat_l3 = feat;
+ {
+ l3_cat_init:
+ if ( !cat_init_feature(®s, feat, info, FEAT_TYPE_L3_CAT) )
+ feat_props[FEAT_TYPE_L3_CAT] = &l3_cat_props;
+ else
+ feat_l3 = feat;
+ }
}
info->feat_init = true;
@@ -1348,7 +1421,7 @@ 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_CDP) )
init_psr();
if ( psr_cpu_prepare() )
This patch implements the CPU init flow for CDP. The flow is almost same as L3 CAT. Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com> --- v14: - remove the 'Notes' in commit message because a stub function is implemented to avoid potential issue. (suggested by Jan Beulich) - remove 'feat_l3_cdp' because it can be replaced by 'feat_l3'. (suggested by Jan Beulich) - implement stub callback functions for CDP to avoid system crash if not full CDP patches applied. (suggested by Jan Beulich) - directly assign correct value to 'alt_type' of CDP. (suggested by Jan Beulich) - goto L3 CAT init process if CDP init fails. (suggested by Jan Beulich) v13: - add commit message. (suggested by Jan Beulich) - fix comment issue. (suggested by Jan Beulich) - set CDP default value before enabling it. (suggested by Jan Beulich) - remove unnecessary check. (suggested by Jan Beulich) - set 'alt_type' for CDP. (suggested by Jan Beulich) - check 'cos_max' and substract 1 before right shift it to get correct value. (suggested by Jan Beulich) v12: - move 'type[]' assignment into l3_cdp_props declaration to make it be 'const'. (suggested by Jan Beulich) - remove "L2 CAT" indication in printk. (suggested by Jan Beulich) - fix coding style issue. (suggested by Jan Beulich) - change 'val' type to uint64_t. (suggested by Jan Beulich) - use 1ull. (suggested by Jan Beulich) - restore mask(0) MSR to default value. (suggested by Jan Beulich) v11: - changes about 'feat_props'. (suggested by Jan Beulich) - remove MSR restore action which is unnecessary. (suggested by Jan Beulich) - modify commit message. v10: - fix comment. (suggested by Jan Beulich) - use swith in 'cat_init_feature' to handle different feature types. (suggested by Jan Beulich) - changes about 'props'. (suggested by Jan Beulich) - restore MSRs to default value when cpu online. (suggested by Jan Beulich) - remove feat_mask. (suggested by Jan Beulich) v9: - modify commit message to describe flow clearer. - handle cpu offline and online again case to read MSRs registers values back and save them into cos array to make user can get real data. - modify error handling process in 'psr_cpu_prepare' to reduce redundant codes. - modify 'get_cdp_data' and 'get_cdp_code' to make them standard. (suggested by Roger Pau and Jan Beulich) - encapsulate CDP operations into 'cat_init_feature' to reduce redundant codes. (suggested by Roger Pau) - reuse 'cat_get_cos_max' for CDP. (suggested by Roger Pau) - handle 'PSR_CDP' in psr_presmp_init to make init work can be done when there is only 'psr=cdp' in cmdline. - remove unnecessary comment. (suggested by Jan Beulich) - move CDP related codes in 'cpu_init_work' into 'psr_cpu_init'. (suggested by Jan Beulich) - add codes to handle CDP's 'cos_num'. (suggested by Jan Beulich) - fix coding style issue. (suggested by Jan Beulich) - do not free resources when allocation fails in 'psr_cpu_prepare'. (suggested by Jan Beulich) - changes about 'uint64_t' to 'uint32_t'. (suggested by Jan Beulich) v7: - initialize 'l3_cdp'. (suggested by Konrad Rzeszutek Wilk) v6: - use 'cpuid_leaf'. (suggested by Konrad Rzeszutek Wilk and Jan Beulich) v5: - remove codes to free 'feat_l3_cdp' in 'free_feature'. (suggested by Jan Beulich) - encapsulate cpuid registers into 'struct cpuid_leaf_regs'. (suggested by Jan Beulich) - print socket info when 'opt_cpu_info' is true. (suggested by Jan Beulich) - rename 'l3_cdp_get_max_cos_max' to 'l3_cdp_get_cos_max'. (suggested by Jan Beulich) - rename 'dat[]' to 'data[]'. (suggested by Jan Beulich) - move 'cpu_prepare_work' contents into 'psr_cpu_prepare'. (suggested by Jan Beulich) v4: - create this patch to make codes easier to understand. (suggested by Jan Beulich) --- xen/arch/x86/psr.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 78 insertions(+), 5 deletions(-)