platform/x86: ISST: Add SST-TF support via TPMI

The support of Intel Speed Select Technology - Turbo Frequency (SST-TF)
feature enables the ability to set different “All core turbo ratio
limits” to cores based on the priority. By using this feature, some cores
can be configured to get higher turbo frequency by designating them as
high priority at the cost of lower or no turbo frequency on the low
priority cores.

One new IOCTLs are added:
ISST_IF_GET_TURBO_FREQ_INFO : Get information about turbo frequency
				buckets

Once an instance is identified, read or write from correct MMIO
offset for a given field as defined in the specification.

For details on SST-TF operations using intel-speed-selet utility,
refer to:
Documentation/admin-guide/pm/intel-speed-select.rst
under the kernel documentation

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: Pragya Tanwar <pragya.tanwar@intel.com>
Link: https://lore.kernel.org/r/20230308070642.1727167-8-srinivas.pandruvada@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
index 0566c8d301817e9d78486c0a348dae3cf89f09e2..5104717afe0ed18f7fa452560b425a5fb498ffb1 100644 (file)
--- a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
+++ b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
@@ -1125,6 +1125,69 @@ static int isst_if_get_tpmi_instance_count(void __user *argp)
        return 0;
 }
 
+#define SST_TF_INFO_0_OFFSET   0
+#define SST_TF_INFO_1_OFFSET   8
+#define SST_TF_INFO_2_OFFSET   16
+
+#define SST_TF_MAX_LP_CLIP_RATIOS      TRL_MAX_LEVELS
+
+#define SST_TF_LP_CLIP_RATIO_0_START   16
+#define SST_TF_LP_CLIP_RATIO_0_WIDTH   8
+
+#define SST_TF_RATIO_0_START   0
+#define SST_TF_RATIO_0_WIDTH   8
+
+#define SST_TF_NUM_CORE_0_START 0
+#define SST_TF_NUM_CORE_0_WIDTH 8
+
+static int isst_if_get_turbo_freq_info(void __user *argp)
+{
+       static struct isst_turbo_freq_info turbo_freq;
+       struct tpmi_per_power_domain_info *power_domain_info;
+       int i, j;
+
+       if (copy_from_user(&turbo_freq, argp, sizeof(turbo_freq)))
+               return -EFAULT;
+
+       power_domain_info = get_instance(turbo_freq.socket_id, turbo_freq.power_domain_id);
+       if (!power_domain_info)
+               return -EINVAL;
+
+       if (turbo_freq.level > power_domain_info->max_level)
+               return -EINVAL;
+
+       turbo_freq.max_buckets = TRL_MAX_BUCKETS;
+       turbo_freq.max_trl_levels = TRL_MAX_LEVELS;
+       turbo_freq.max_clip_freqs = SST_TF_MAX_LP_CLIP_RATIOS;
+
+       for (i = 0; i < turbo_freq.max_clip_freqs; ++i)
+               _read_tf_level_info("lp_clip*", turbo_freq.lp_clip_freq_mhz[i],
+                                   turbo_freq.level, SST_TF_INFO_0_OFFSET,
+                                   SST_TF_LP_CLIP_RATIO_0_START +
+                                   (i * SST_TF_LP_CLIP_RATIO_0_WIDTH),
+                                   SST_TF_LP_CLIP_RATIO_0_WIDTH, SST_MUL_FACTOR_FREQ)
+
+       for (i = 0; i < TRL_MAX_LEVELS; ++i) {
+               for (j = 0; j < TRL_MAX_BUCKETS; ++j)
+                       _read_tf_level_info("cydn*_bucket_*_trl",
+                                           turbo_freq.trl_freq_mhz[i][j], turbo_freq.level,
+                                           SST_TF_INFO_2_OFFSET + (i * SST_TF_RATIO_0_WIDTH),
+                                           j * SST_TF_RATIO_0_WIDTH, SST_TF_RATIO_0_WIDTH,
+                                           SST_MUL_FACTOR_FREQ)
+       }
+
+       for (i = 0; i < TRL_MAX_BUCKETS; ++i)
+               _read_tf_level_info("bucket_*_core_count", turbo_freq.bucket_core_counts[i],
+                                   turbo_freq.level, SST_TF_INFO_1_OFFSET,
+                                   SST_TF_NUM_CORE_0_WIDTH * i, SST_TF_NUM_CORE_0_WIDTH,
+                                   SST_MUL_FACTOR_NONE)
+
+       if (copy_to_user(argp, &turbo_freq, sizeof(turbo_freq)))
+               return -EFAULT;
+
+       return 0;
+}
+
 static long isst_if_def_ioctl(struct file *file, unsigned int cmd,
                              unsigned long arg)
 {
@@ -1166,6 +1229,9 @@ static long isst_if_def_ioctl(struct file *file, unsigned int cmd,
        case ISST_IF_GET_BASE_FREQ_CPU_MASK:
                ret = isst_if_get_base_freq_mask(argp);
                break;
+       case ISST_IF_GET_TURBO_FREQ_INFO:
+               ret = isst_if_get_turbo_freq_info(argp);
+               break;
        default:
                break;
        }

diff --git a/include/uapi/linux/isst_if.h b/include/uapi/linux/isst_if.h
index c4b350ea5cbe5c5fb82b2151953d5735e63bf9c7..0df1a1c3caf4f8d9c77792328f547f71a2f44f78 100644 (file)
--- a/include/uapi/linux/isst_if.h
+++ b/include/uapi/linux/isst_if.h
@@ -426,6 +426,31 @@ struct isst_base_freq_info {
        __u16 thermal_design_power_w;
 };
 
+/**
+ * struct isst_turbo_freq_info - Structure to get SST-TF frequencies
+ * @socket_id: Socket/package id
+ * @power_domain:      Power Domain id
+ * @level:     SST-PP level for which caller wants to get information
+ * @max_clip_freqs: Maximum number of low priority core clipping frequencies
+ * @lp_clip_freq_mhz: Clip frequencies per trl level
+ * @bucket_core_counts: Maximum number of cores for a bucket
+ * @trl_freq_mhz: Frequencies per trl level for each bucket
+ *
+ * Structure used to get SST-TF information using
+ * IOCTL ISST_IF_GET_TURBO_FREQ_INFO.
+ */
+struct isst_turbo_freq_info {
+       __u8 socket_id;
+       __u8 power_domain_id;
+       __u16 level;
+       __u16 max_clip_freqs;
+       __u16 max_buckets;
+       __u16 max_trl_levels;
+       __u16 lp_clip_freq_mhz[TRL_MAX_LEVELS];
+       __u16 bucket_core_counts[TRL_MAX_BUCKETS];
+       __u16 trl_freq_mhz[TRL_MAX_LEVELS][TRL_MAX_BUCKETS];
+};
+
 #define ISST_IF_MAGIC                  0xFE
 #define ISST_IF_GET_PLATFORM_INFO      _IOR(ISST_IF_MAGIC, 0, struct isst_if_platform_info *)
 #define ISST_IF_GET_PHY_ID             _IOWR(ISST_IF_MAGIC, 1, struct isst_if_cpu_map *)
@@ -445,5 +470,6 @@ struct isst_base_freq_info {
 #define ISST_IF_GET_PERF_LEVEL_CPU_MASK        _IOR(ISST_IF_MAGIC, 13, struct isst_perf_level_cpu_mask *)
 #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 *)
 
 #endif