| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <console/console.h> |
| #include <intelblocks/cse.h> |
| #include <timestamp.h> |
| |
| #define MSEC_TO_USEC(x) (x * 1000) |
| |
| static void process_cse_telemetry_data(void) |
| { |
| struct cse_boot_perf_rsp cse_perf_data; |
| s64 ts[NUM_CSE_BOOT_PERF_DATA] = {0}; |
| s64 current_time; |
| int zero_point_idx = 0; |
| |
| /* |
| * 1. Each TS holds the time elapsed between the "Zero-Point" till the TS itself |
| * happened. |
| * 2. In case CSME did not hit some of the TS in the latest boot flow that value of |
| * these TS will be 0x00000000. |
| * 3. In case of error, TS value will be set to 0xFFFFFFFF. |
| * 4. All other TS values will be relative to the zero point. The API caller should |
| * normalize the TS values to the zero-point value. |
| */ |
| if (cse_get_boot_performance_data(&cse_perf_data) != CB_SUCCESS) |
| return; |
| |
| current_time = timestamp_get(); |
| |
| for (unsigned int i = 0; i < NUM_CSE_BOOT_PERF_DATA; i++) { |
| |
| if (cse_perf_data.timestamp[i] == 0xffffffff) { |
| printk(BIOS_ERR, "%s: CSME timestamps invalid\n", __func__); |
| return; |
| } |
| |
| ts[i] = (s64)MSEC_TO_USEC(cse_perf_data.timestamp[i]) * |
| timestamp_tick_freq_mhz(); |
| } |
| |
| /* Find zero-point */ |
| for (unsigned int i = 0; i < NUM_CSE_BOOT_PERF_DATA; i++) { |
| if (cse_perf_data.timestamp[i] != 0) { |
| zero_point_idx = i; |
| break; |
| } |
| } |
| |
| /* Normalize TS values to zero-point */ |
| for (unsigned int i = zero_point_idx + 1; i < NUM_CSE_BOOT_PERF_DATA; i++) { |
| |
| if (ts[i] && ts[i] < ts[zero_point_idx]) { |
| printk(BIOS_ERR, "%s: CSME timestamps invalid," |
| " wraparound detected\n", __func__); |
| return; |
| } |
| |
| if (ts[i]) |
| ts[i] -= ts[zero_point_idx]; |
| } |
| |
| /* Inject CSME timestamps into the coreboot timestamp table */ |
| soc_cbmem_inject_telemetry_data(ts, current_time); |
| } |
| |
| void cse_get_telemetry_data(void) |
| { |
| /* If CSE is already hidden then accessing CSE registers should be avoided */ |
| if (!is_cse_enabled()) { |
| printk(BIOS_DEBUG, "CSE is disabled, not sending `Get Boot Perf` message\n"); |
| return; |
| } |
| |
| process_cse_telemetry_data(); |
| } |