accel/ivpu: Pass D0i3 residency time to the VPU firmware

The firmware needs to know the time spent in D0i3/D3 to
calculate telemetry data. The D0i3/D3 residency time is
calculated by the driver and passed to the firmware
in the boot parameters.

The driver also passes VPU perf counter value captured
right before entering D0i3 - this allows the VPU firmware
to generate monotonic timestamps for the logs.
Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231028133415.1169975-9-stanislaw.gruszka@linux.intel.com

drivers/accel/ivpu/ivpu_fw.c

@@ -426,14 +426,27 @@ static void ivpu_fw_boot_params_print(struct ivpu_device *vdev, struct vpu_boot_
 		 boot_params->vpu_telemetry_enable);
 	ivpu_dbg(vdev, FW_BOOT, "boot_params.dvfs_mode = %u\n",
 		 boot_params->dvfs_mode);
+	ivpu_dbg(vdev, FW_BOOT, "boot_params.d0i3_residency_time_us = %lld\n",
+		 boot_params->d0i3_residency_time_us);
+	ivpu_dbg(vdev, FW_BOOT, "boot_params.d0i3_entry_vpu_ts = %llu\n",
+		 boot_params->d0i3_entry_vpu_ts);
 }
 
 void ivpu_fw_boot_params_setup(struct ivpu_device *vdev, struct vpu_boot_params *boot_params)
 {
 	struct ivpu_bo *ipc_mem_rx = vdev->ipc->mem_rx;
 
-	/* In case of warm boot we only have to reset the entrypoint addr */
+	/* In case of warm boot only update variable params */
 	if (!ivpu_fw_is_cold_boot(vdev)) {
+		boot_params->d0i3_residency_time_us =
+			ktime_us_delta(ktime_get_boottime(), vdev->hw->d0i3_entry_host_ts);
+		boot_params->d0i3_entry_vpu_ts = vdev->hw->d0i3_entry_vpu_ts;
+
+		ivpu_dbg(vdev, FW_BOOT, "boot_params.d0i3_residency_time_us = %lld\n",
+			 boot_params->d0i3_residency_time_us);
+		ivpu_dbg(vdev, FW_BOOT, "boot_params.d0i3_entry_vpu_ts = %llu\n",
+			 boot_params->d0i3_entry_vpu_ts);
+
 		boot_params->save_restore_ret_address = 0;
 		vdev->pm->is_warmboot = true;
 		return;
@@ -497,6 +510,8 @@ void ivpu_fw_boot_params_setup(struct ivpu_device *vdev, struct vpu_boot_params
 	boot_params->punit_telemetry_sram_size = ivpu_hw_reg_telemetry_size_get(vdev);
 	boot_params->vpu_telemetry_enable = ivpu_hw_reg_telemetry_enable_get(vdev);
 	boot_params->dvfs_mode = vdev->fw->dvfs_mode;
+	boot_params->d0i3_residency_time_us = 0;
+	boot_params->d0i3_entry_vpu_ts = 0;
 
 	wmb(); /* Flush WC buffers after writing bootparams */
 

drivers/accel/ivpu/ivpu_hw.h

@@ -57,6 +57,8 @@ struct ivpu_hw_info {
 	u32 sku;
 	u16 config;
 	int dma_bits;
+	ktime_t d0i3_entry_host_ts;
+	u64 d0i3_entry_vpu_ts;
 };
 
 extern const struct ivpu_hw_ops ivpu_hw_37xx_ops;

drivers/accel/ivpu/ivpu_hw_37xx.c

@@ -714,10 +714,18 @@ static bool ivpu_hw_37xx_is_idle(struct ivpu_device *vdev)
 	       REG_TEST_FLD(VPU_37XX_BUTTRESS_VPU_STATUS, IDLE, val);
 }
 
+static void ivpu_hw_37xx_save_d0i3_entry_timestamp(struct ivpu_device *vdev)
+{
+	vdev->hw->d0i3_entry_host_ts = ktime_get_boottime();
+	vdev->hw->d0i3_entry_vpu_ts = REGV_RD64(VPU_37XX_CPU_SS_TIM_PERF_FREE_CNT);
+}
+
 static int ivpu_hw_37xx_power_down(struct ivpu_device *vdev)
 {
 	int ret = 0;
 
+	ivpu_hw_37xx_save_d0i3_entry_timestamp(vdev);
+
 	if (!ivpu_hw_37xx_is_idle(vdev) && ivpu_hw_37xx_reset(vdev))
 		ivpu_err(vdev, "Failed to reset the VPU\n");
 

drivers/accel/ivpu/ivpu_hw_37xx_reg.h

@@ -240,6 +240,8 @@
 #define VPU_37XX_CPU_SS_TIM_GEN_CONFIG					0x06021008u
 #define VPU_37XX_CPU_SS_TIM_GEN_CONFIG_WDOG_TO_INT_CLR_MASK		BIT_MASK(9)
 
+#define VPU_37XX_CPU_SS_TIM_PERF_FREE_CNT				0x06029000u
+
 #define VPU_37XX_CPU_SS_DOORBELL_0					0x06300000u
 #define VPU_37XX_CPU_SS_DOORBELL_0_SET_MASK				BIT_MASK(0)