platform/x86: ISST: Support SST-BF and SST-TF per level

SST SST-BF and SST-TF can be enabled/disabled per SST-PP level. So return
a mask of all levels, where the feature is supported, instead of just for
level 0.

Since the return value returns all levels mask, not just level 0, update
API version.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Link: https://lore.kernel.org/r/20240430221052.15825-1-srinivas.pandruvada@linux.intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Author: spandruvada

drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c

@@ -847,6 +847,8 @@ static int isst_if_get_perf_level(void __user *argp)
 {
 	struct isst_perf_level_info perf_level;
 	struct tpmi_per_power_domain_info *power_domain_info;
+	unsigned long level_mask;
+	u8 level, support;
 
 	if (copy_from_user(&perf_level, argp, sizeof(perf_level)))
 		return -EFAULT;
@@ -866,12 +868,34 @@ static int isst_if_get_perf_level(void __user *argp)
 		      SST_PP_FEATURE_STATE_START, SST_PP_FEATURE_STATE_WIDTH, SST_MUL_FACTOR_NONE)
 	perf_level.enabled = !!(power_domain_info->sst_header.cap_mask & BIT(1));
 
-	_read_bf_level_info("bf_support", perf_level.sst_bf_support, 0, 0,
-			    SST_BF_FEATURE_SUPPORTED_START, SST_BF_FEATURE_SUPPORTED_WIDTH,
-			    SST_MUL_FACTOR_NONE);
-	_read_tf_level_info("tf_support", perf_level.sst_tf_support, 0, 0,
-			    SST_TF_FEATURE_SUPPORTED_START, SST_TF_FEATURE_SUPPORTED_WIDTH,
-			    SST_MUL_FACTOR_NONE);
+	level_mask = perf_level.level_mask;
+	perf_level.sst_bf_support = 0;
+	for_each_set_bit(level, &level_mask, BITS_PER_BYTE) {
+		/*
+		 * Read BF support for a level. Read output is updated
+		 * to "support" variable by the below macro.
+		 */
+		_read_bf_level_info("bf_support", support, level, 0, SST_BF_FEATURE_SUPPORTED_START,
+				    SST_BF_FEATURE_SUPPORTED_WIDTH, SST_MUL_FACTOR_NONE);
+
+		/* If supported set the bit for the level */
+		if (support)
+			perf_level.sst_bf_support |= BIT(level);
+	}
+
+	perf_level.sst_tf_support = 0;
+	for_each_set_bit(level, &level_mask, BITS_PER_BYTE) {
+		/*
+		 * Read TF support for a level. Read output is updated
+		 * to "support" variable by the below macro.
+		 */
+		_read_tf_level_info("tf_support", support, level, 0, SST_TF_FEATURE_SUPPORTED_START,
+				    SST_TF_FEATURE_SUPPORTED_WIDTH, SST_MUL_FACTOR_NONE);
+
+		/* If supported set the bit for the level */
+		if (support)
+			perf_level.sst_tf_support |= BIT(level);
+	}
 
 	if (copy_to_user(argp, &perf_level, sizeof(perf_level)))
 		return -EFAULT;
@@ -1648,7 +1672,7 @@ void tpmi_sst_dev_resume(struct auxiliary_device *auxdev)
 }
 EXPORT_SYMBOL_NS_GPL(tpmi_sst_dev_resume, INTEL_TPMI_SST);
 
-#define ISST_TPMI_API_VERSION	0x02
+#define ISST_TPMI_API_VERSION	0x03
 
 int tpmi_sst_init(void)
 {