@@ -154,6 +154,17 @@ struct feat_ops {
*/
int (*compare_val)(const uint64_t val[], const struct feat_node *feat,
unsigned int cos, bool *found);
+ /*
+ * fits_cos_max is used to check if the input cos id exceeds the
+ * feature's cos_max and if the input value is not the default one.
+ * Even if the associated cos exceeds the cos_max, HW can work with default
+ * value. That is the reason we need check if input value is default one.
+ * If both criteria are fulfilled, that means the input exceeds the range.
+ * If not, that means the input fits the requirements.
+ */
+ bool (*fits_cos_max)(const uint64_t val[],
+ const struct feat_node *feat,
+ unsigned int cos);
};
/*
@@ -388,6 +399,25 @@ static int l3_cat_compare_val(const uint64_t val[],
return 0;
}
+static bool l3_cat_fits_cos_max(const uint64_t val[],
+ const struct feat_node *feat,
+ unsigned int cos)
+{
+ uint64_t l3_def_cbm;
+
+ l3_def_cbm = (1ull << feat->info.l3_cat_info.cbm_len) - 1;
+
+ if ( cos > feat->info.l3_cat_info.cos_max &&
+ val[0] != l3_def_cbm )
+ /*
+ * Exceed cos_max and value to set is not default,
+ * return error.
+ */
+ return false;
+
+ return true;
+}
+
static const struct feat_ops l3_cat_ops = {
.get_cos_max = l3_cat_get_cos_max,
.get_feat_info = l3_cat_get_feat_info,
@@ -396,6 +426,7 @@ static const struct feat_ops l3_cat_ops = {
.get_old_val = l3_cat_get_old_val,
.set_new_val = l3_cat_set_new_val,
.compare_val = l3_cat_compare_val,
+ .fits_cos_max = l3_cat_fits_cos_max,
};
static void __init parse_psr_bool(char *s, char *value, char *feature,
@@ -802,11 +833,79 @@ static int find_cos(const uint64_t *val, uint32_t array_len,
return -ENOENT;
}
+static bool fits_cos_max(const uint64_t *val,
+ uint32_t array_len,
+ const struct psr_socket_info *info,
+ unsigned int cos)
+{
+ unsigned int ret;
+ const uint64_t *val_tmp = val;
+ const struct feat_node *feat;
+
+ list_for_each_entry(feat, &info->feat_list, list)
+ {
+ ret = feat->ops.fits_cos_max(val_tmp, feat, cos);
+ if ( !ret )
+ return false;
+
+ val_tmp += feat->ops.get_cos_num(feat);
+ if ( val_tmp - val > array_len )
+ return false;
+ }
+
+ return true;
+}
+
static int pick_avail_cos(const struct psr_socket_info *info,
const uint64_t *val, uint32_t array_len,
unsigned int old_cos,
enum psr_feat_type feat_type)
{
+ unsigned int cos;
+ unsigned int cos_max = 0;
+ const struct feat_node *feat;
+ const unsigned int *ref = info->cos_ref;
+
+ /*
+ * cos_max is the one of the feature which is being set.
+ */
+ list_for_each_entry(feat, &info->feat_list, list)
+ {
+ if ( feat->feature != feat_type )
+ continue;
+
+ cos_max = feat->ops.get_cos_max(feat);
+ if ( cos_max > 0 )
+ break;
+ }
+
+ if ( !cos_max )
+ return -ENOENT;
+
+ /*
+ * If old cos is referred only by the domain, then use it. And, we cannot
+ * use id 0 because it stores the default values.
+ */
+ if ( old_cos && ref[old_cos] == 1 &&
+ fits_cos_max(val, array_len, info, old_cos) )
+ return old_cos;
+
+ /* Find an unused one other than cos0. */
+ for ( cos = 1; cos <= cos_max; cos++ )
+ {
+ /*
+ * ref is 0 means this COS is not used by other domain and
+ * can be used for current setting.
+ */
+ if ( !ref[cos] )
+ {
+ if ( !fits_cos_max(val, array_len, info, cos) )
+ return -ENOENT;
+
+ return cos;
+ }
+ }
+
return -ENOENT;
}
Continue with previous patch: 'x86: refactor psr: set value: implement cos finding flow.' If fail to find a COS ID, we need pick a new COS ID for domain. Only COS ID that ref[COS_ID] is 1 or 0 can be picked to input a new set feature values. Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com> --- xen/arch/x86/psr.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+)