platform/x86: ISST: Support SST-PP revision 2

JIRA: https://issues.redhat.com/browse/RHEL-110834

commit d6644d7
Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date:   Tue May 6 09:35:30 2025 -0700

    platform/x86: ISST: Support SST-PP revision 2

    SST PP revision 2 added fabric 1 P0, P1 and Pm frequencies. Export them
    by using a new IOCTL ISST_IF_GET_PERF_LEVEL_FABRIC_INFO. This IOCTL
    requires platforms with SST PP revision 2 or higher.

    To accommodate potential future increases in fabric count and avoid ABI
    changes, support is extended for up to 8 fabrics.

    Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
    Link: https://lore.kernel.org/r/20250506163531.1061185-3-srinivas.pandruvada@linux.intel.com
    Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
    Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Signed-off-by: Steve Best <sbest@redhat.com>

Author: sfbest

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

@@ -1016,6 +1016,7 @@ static int isst_if_set_perf_feature(void __user *argp)
 
 #define SST_PP_INFO_10_OFFSET	80
 #define SST_PP_INFO_11_OFFSET	88
+#define SST_PP_INFO_12_OFFSET	96
 
 #define SST_PP_P1_SSE_START	0
 #define SST_PP_P1_SSE_WIDTH	8
@@ -1068,6 +1069,15 @@ static int isst_if_set_perf_feature(void __user *argp)
 #define SST_PP_CORE_RATIO_PM_FABRIC_START	48
 #define SST_PP_CORE_RATIO_PM_FABRIC_WIDTH	8
 
+#define SST_PP_CORE_RATIO_P0_FABRIC_1_START	0
+#define SST_PP_CORE_RATIO_P0_FABRIC_1_WIDTH	8
+
+#define SST_PP_CORE_RATIO_P1_FABRIC_1_START	8
+#define SST_PP_CORE_RATIO_P1_FABRIC_1_WIDTH	8
+
+#define SST_PP_CORE_RATIO_PM_FABRIC_1_START	16
+#define SST_PP_CORE_RATIO_PM_FABRIC_1_WIDTH	8
+
 static int isst_if_get_perf_level_info(void __user *argp)
 {
 	struct isst_perf_level_data_info perf_level;
@@ -1167,6 +1177,59 @@ static int isst_if_get_perf_level_info(void __user *argp)
 	return 0;
 }
 
+static int isst_if_get_perf_level_fabric_info(void __user *argp)
+{
+	struct isst_perf_level_fabric_info perf_level_fabric;
+	struct tpmi_per_power_domain_info *power_domain_info;
+	int start = SST_PP_CORE_RATIO_P0_FABRIC_START;
+	int width = SST_PP_CORE_RATIO_P0_FABRIC_WIDTH;
+	int offset = SST_PP_INFO_11_OFFSET;
+	int i;
+
+	if (copy_from_user(&perf_level_fabric, argp, sizeof(perf_level_fabric)))
+		return -EFAULT;
+
+	power_domain_info = get_instance(perf_level_fabric.socket_id,
+					 perf_level_fabric.power_domain_id);
+	if (!power_domain_info)
+		return -EINVAL;
+
+	if (perf_level_fabric.level > power_domain_info->max_level)
+		return -EINVAL;
+
+	if (power_domain_info->pp_header.feature_rev < 2)
+		return -EINVAL;
+
+	if (!(power_domain_info->pp_header.level_en_mask & BIT(perf_level_fabric.level)))
+		return -EINVAL;
+
+	/* For revision 2, maximum number of fabrics is 2 */
+	perf_level_fabric.max_fabrics = 2;
+
+	for (i = 0; i < perf_level_fabric.max_fabrics; i++) {
+		_read_pp_level_info("p0_fabric_freq_mhz", perf_level_fabric.p0_fabric_freq_mhz[i],
+				    perf_level_fabric.level, offset, start, width,
+				    SST_MUL_FACTOR_FREQ)
+		start += width;
+
+		_read_pp_level_info("p1_fabric_freq_mhz", perf_level_fabric.p1_fabric_freq_mhz[i],
+				    perf_level_fabric.level, offset, start, width,
+				    SST_MUL_FACTOR_FREQ)
+		start += width;
+
+		_read_pp_level_info("pm_fabric_freq_mhz", perf_level_fabric.pm_fabric_freq_mhz[i],
+				    perf_level_fabric.level, offset, start, width,
+				    SST_MUL_FACTOR_FREQ)
+		offset = SST_PP_INFO_12_OFFSET;
+		start = SST_PP_CORE_RATIO_P0_FABRIC_1_START;
+	}
+
+	if (copy_to_user(argp, &perf_level_fabric, sizeof(perf_level_fabric)))
+		return -EFAULT;
+
+	return 0;
+}
+
 #define SST_PP_FUSED_CORE_COUNT_START	0
 #define SST_PP_FUSED_CORE_COUNT_WIDTH	8
 
@@ -1453,6 +1516,9 @@ static long isst_if_def_ioctl(struct file *file, unsigned int cmd,
 	case ISST_IF_GET_PERF_LEVEL_INFO:
 		ret = isst_if_get_perf_level_info(argp);
 		break;
+	case ISST_IF_GET_PERF_LEVEL_FABRIC_INFO:
+		ret = isst_if_get_perf_level_fabric_info(argp);
+		break;
 	case ISST_IF_GET_PERF_LEVEL_CPU_MASK:
 		ret = isst_if_get_perf_level_mask(argp);
 		break;

include/uapi/linux/isst_if.h

@@ -375,6 +375,30 @@ struct isst_perf_level_data_info {
 	__u16 trl_freq_mhz[TRL_MAX_LEVELS][TRL_MAX_BUCKETS];
 };
 
+#define MAX_FABRIC_COUNT	8
+
+/**
+ * struct isst_perf_level_fabric_info - Structure to get SST-PP fabric details
+ * @socket_id:		Socket/package id
+ * @power_domain_id:	Power Domain id
+ * @level:		SST-PP level for which caller wants to get information
+ * @max_fabrics:	Count of fabrics in resonse
+ * @p0_fabric_freq_mhz: Fabric (Uncore) maximum frequency
+ * @p1_fabric_freq_mhz: Fabric (Uncore) TDP frequency
+ * @pm_fabric_freq_mhz: Fabric (Uncore) minimum frequency
+ *
+ * Structure used to get information on frequencies for fabrics.
+ */
+struct isst_perf_level_fabric_info {
+	__u8 socket_id;
+	__u8 power_domain_id;
+	__u16 level;
+	__u16 max_fabrics;
+	__u16 p0_fabric_freq_mhz[MAX_FABRIC_COUNT];
+	__u16 p1_fabric_freq_mhz[MAX_FABRIC_COUNT];
+	__u16 pm_fabric_freq_mhz[MAX_FABRIC_COUNT];
+};
+
 /**
  * struct isst_perf_level_cpu_mask - Structure to get SST-PP level CPU mask
  * @socket_id:	Socket/package id
@@ -471,5 +495,7 @@ struct isst_turbo_freq_info {
 #define ISST_IF_GET_BASE_FREQ_INFO	_IOR(ISST_IF_MAGIC, 14, struct isst_base_freq_info *)
 #define ISST_IF_GET_BASE_FREQ_CPU_MASK	_IOR(ISST_IF_MAGIC, 15, struct isst_perf_level_cpu_mask *)
 #define ISST_IF_GET_TURBO_FREQ_INFO	_IOR(ISST_IF_MAGIC, 16, struct isst_turbo_freq_info *)
+#define ISST_IF_GET_PERF_LEVEL_FABRIC_INFO _IOR(ISST_IF_MAGIC, 17,\
+						struct isst_perf_level_fabric_info *)
 
 #endif