diff options
Diffstat (limited to 'driver/nvidia_gpu.c')
| -rw-r--r-- | driver/nvidia_gpu.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/driver/nvidia_gpu.c b/driver/nvidia_gpu.c new file mode 100644 index 0000000000..e9fbd156ac --- /dev/null +++ b/driver/nvidia_gpu.c @@ -0,0 +1,161 @@ +/* Copyright 2022 The ChromiumOS Authors + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * Nvidia GPU D-Notify driver + */ + +#include <stddef.h> + +#include "charge_manager.h" +#include "charge_state.h" +#include "compile_time_macros.h" +#include "console.h" +#include "extpower.h" +#include "gpio.h" +#include "hooks.h" +#include "host_command.h" +#include "nvidia_gpu.h" +#include "throttle_ap.h" +#include "timer.h" + +#define CPRINTS(fmt, args...) cprints(CC_GPU, "GPU: " fmt, ##args) +#define CPRINTF(fmt, args...) cprintf(CC_GPU, "GPU: " fmt, ##args) + +test_export_static enum d_notify_level d_notify_level = D_NOTIFY_1; +test_export_static bool policy_initialized = false; +test_export_static const struct d_notify_policy *d_notify_policy = NULL; + +void nvidia_gpu_init_policy(const struct d_notify_policy *policy) +{ + if (policy) { + d_notify_policy = policy; + policy_initialized = true; + } +} + +void nvidia_gpu_over_temp(int assert) +{ + uint8_t *memmap_gpu = (uint8_t *)host_get_memmap(EC_MEMMAP_GPU); + + if (assert) + *memmap_gpu |= EC_MEMMAP_GPU_OVERT_BIT; + else + *memmap_gpu &= ~EC_MEMMAP_GPU_OVERT_BIT; + + host_set_single_event(EC_HOST_EVENT_GPU); +} + +static void set_d_notify_level(enum d_notify_level level) +{ + uint8_t *memmap_gpu = (uint8_t *)host_get_memmap(EC_MEMMAP_GPU); + + if (level == d_notify_level) + return; + + d_notify_level = level; + *memmap_gpu = (*memmap_gpu & ~EC_MEMMAP_GPU_D_NOTIFY_MASK) | + d_notify_level; + host_set_single_event(EC_HOST_EVENT_GPU); + CPRINTS("Set D-notify level to D%c", ('1' + (int)d_notify_level)); +} + +static void evaluate_d_notify_level(void) +{ + enum d_notify_level lvl; + const struct d_notify_policy *policy = d_notify_policy; + + /* + * We don't need to care about 'transitioning to S0' because throttling + * is unlikely required when the system is about to start. + */ + if (!chipset_in_state(CHIPSET_STATE_ON)) + return; + + if (!policy_initialized) { + CPRINTS("WARN: %s called before policies are set.", __func__); + return; + } + + if (extpower_is_present()) { + const int watts = charge_manager_get_power_limit_uw() / 1000000; + + for (lvl = D_NOTIFY_1; lvl <= D_NOTIFY_5; lvl++) { + if (policy[lvl].power_source != D_NOTIFY_AC && + policy[lvl].power_source != D_NOTIFY_AC_DC) + continue; + + if (policy[lvl].power_source == D_NOTIFY_AC) { + if (watts >= policy[lvl].ac.min_charger_watts) { + set_d_notify_level(lvl); + break; + } + } else { + set_d_notify_level(lvl); + break; + } + } + } else { + const int soc = charge_get_percent(); + + for (lvl = D_NOTIFY_5; lvl >= D_NOTIFY_1; lvl--) { + if (policy[lvl].power_source == D_NOTIFY_DC) { + if (soc <= policy[lvl].dc.min_battery_soc) { + set_d_notify_level(lvl); + break; + } + } else if (policy[lvl].power_source == D_NOTIFY_AC_DC) { + set_d_notify_level(lvl); + break; + } + } + } +} + +static void disable_gpu_acoff(void) +{ + gpio_set_level(GPIO_NVIDIA_GPU_ACOFF_ODL, 1); + evaluate_d_notify_level(); +} +DECLARE_DEFERRED(disable_gpu_acoff); + +static void handle_battery_soc_change(void) +{ + evaluate_d_notify_level(); +} +DECLARE_HOOK(HOOK_BATTERY_SOC_CHANGE, handle_battery_soc_change, + HOOK_PRIO_DEFAULT); + +/* + * This function enables and disables both hard and soft throttles. (Thus, + * <type> has no meaning.). + * + * When throttling, it hard-throttles the GPU and sets the D-level to D5. It + * also schedules a deferred call to disable the hard throttle. So, it's not + * necessary to call it for unthrottling. + * + * Currently, it's upto each board when this is called. For example, it can be + * called from board_set_active_charge_port since board_set_active_charge_port + * is called whenever (and prior to) active port or active supplier or both + * changes. + */ +void throttle_gpu(enum throttle_level level, enum throttle_type type, /* not + used */ + enum throttle_sources source) +{ + if (level == THROTTLE_ON) { + /* Cancel pending deferred call. */ + hook_call_deferred(&disable_gpu_acoff_data, -1); + /* Toggle hardware throttle immediately. */ + gpio_set_level(GPIO_NVIDIA_GPU_ACOFF_ODL, 0); + /* + * Switch to the lowest (D5) first then move up as the situation + * improves. + */ + set_d_notify_level(D_NOTIFY_5); + hook_call_deferred(&disable_gpu_acoff_data, + NVIDIA_GPU_ACOFF_DURATION); + } else { + disable_gpu_acoff(); + } +} |