diff options
| -rw-r--r-- | Documentation/admin-guide/thermal/intel_powerclamp.rst | 22 | ||||
| -rw-r--r-- | drivers/thermal/intel/intel_powerclamp.c | 176 |
2 files changed, 178 insertions, 20 deletions
diff --git a/Documentation/admin-guide/thermal/intel_powerclamp.rst b/Documentation/admin-guide/thermal/intel_powerclamp.rst index 3f6dfb0b3ea6..2d9d2d739f02 100644 --- a/Documentation/admin-guide/thermal/intel_powerclamp.rst +++ b/Documentation/admin-guide/thermal/intel_powerclamp.rst @@ -26,6 +26,8 @@ By: - Generic Thermal Layer (sysfs) - Kernel APIs (TBD) + (*) Module Parameters + INTRODUCTION ============ @@ -318,3 +320,23 @@ device, a PID based userspace thermal controller can manage to control CPU temperature effectively, when no other thermal influence is added. For example, a UltraBook user can compile the kernel under certain temperature (below most active trip points). + +Module Parameters +================= + +``cpumask`` (RW) + A bit mask of CPUs to inject idle. The format of the bitmask is same as + used in other subsystems like in /proc/irq/*/smp_affinity. The mask is + comma separated 32 bit groups. Each CPU is one bit. For example for a 256 + CPU system the full mask is: + ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff,ffffffff + + The rightmost mask is for CPU 0-32. + +``max_idle`` (RW) + Maximum injected idle time to the total CPU time ratio in percent range + from 1 to 100. Even if the cooling device max_state is always 100 (100%), + this parameter allows to add a max idle percent limit. The default is 50, + to match the current implementation of powerclamp driver. Also doesn't + allow value more than 75, if the cpumask includes every CPU present in + the system. diff --git a/drivers/thermal/intel/intel_powerclamp.c b/drivers/thermal/intel/intel_powerclamp.c index 5995d10b5699..c7ba5680cd48 100644 --- a/drivers/thermal/intel/intel_powerclamp.c +++ b/drivers/thermal/intel/intel_powerclamp.c @@ -37,7 +37,7 @@ #include <asm/mwait.h> #include <asm/cpu_device_id.h> -#define MAX_TARGET_RATIO (50U) +#define MAX_TARGET_RATIO (100U) /* For each undisturbed clamping period (no extra wake ups during idle time), * we increment the confidence counter for the given target ratio. * CONFIDENCE_OK defines the level where runtime calibration results are @@ -121,6 +121,141 @@ static const struct kernel_param_ops duration_ops = { module_param_cb(duration, &duration_ops, NULL, 0644); MODULE_PARM_DESC(duration, "forced idle time for each attempt in msec."); +#define DEFAULT_MAX_IDLE 50 +#define MAX_ALL_CPU_IDLE 75 + +static u8 max_idle = DEFAULT_MAX_IDLE; + +static cpumask_var_t idle_injection_cpu_mask; + +static int allocate_copy_idle_injection_mask(const struct cpumask *copy_mask) +{ + if (cpumask_available(idle_injection_cpu_mask)) + goto copy_mask; + + /* This mask is allocated only one time and freed during module exit */ + if (!alloc_cpumask_var(&idle_injection_cpu_mask, GFP_KERNEL)) + return -ENOMEM; + +copy_mask: + cpumask_copy(idle_injection_cpu_mask, copy_mask); + + return 0; +} + +/* Return true if the cpumask and idle percent combination is invalid */ +static bool check_invalid(cpumask_var_t mask, u8 idle) +{ + if (cpumask_equal(cpu_present_mask, mask) && idle > MAX_ALL_CPU_IDLE) + return true; + + return false; +} + +static int cpumask_set(const char *arg, const struct kernel_param *kp) +{ + cpumask_var_t new_mask; + int ret; + + mutex_lock(&powerclamp_lock); + + /* Can't set mask when cooling device is in use */ + if (powerclamp_data.clamping) { + ret = -EAGAIN; + goto skip_cpumask_set; + } + + ret = alloc_cpumask_var(&new_mask, GFP_KERNEL); + if (!ret) + goto skip_cpumask_set; + + ret = bitmap_parse(arg, strlen(arg), cpumask_bits(new_mask), + nr_cpumask_bits); + if (ret) + goto free_cpumask_set; + + if (cpumask_empty(new_mask) || check_invalid(new_mask, max_idle)) { + ret = -EINVAL; + goto free_cpumask_set; + } + + /* + * When module parameters are passed from kernel command line + * during insmod, the module parameter callback is called + * before powerclamp_init(), so we can't assume that some + * cpumask can be allocated and copied before here. Also + * in this case this cpumask is used as the default mask. + */ + ret = allocate_copy_idle_injection_mask(new_mask); + +free_cpumask_set: + free_cpumask_var(new_mask); +skip_cpumask_set: + mutex_unlock(&powerclamp_lock); + + return ret; +} + +static int cpumask_get(char *buf, const struct kernel_param *kp) +{ + if (!cpumask_available(idle_injection_cpu_mask)) + return -ENODEV; + + return bitmap_print_to_pagebuf(false, buf, cpumask_bits(idle_injection_cpu_mask), + nr_cpumask_bits); +} + +static const struct kernel_param_ops cpumask_ops = { + .set = cpumask_set, + .get = cpumask_get, +}; + +module_param_cb(cpumask, &cpumask_ops, NULL, 0644); +MODULE_PARM_DESC(cpumask, "Mask of CPUs to use for idle injection."); + +static int max_idle_set(const char *arg, const struct kernel_param *kp) +{ + u8 new_max_idle; + int ret = 0; + + mutex_lock(&powerclamp_lock); + + /* Can't set mask when cooling device is in use */ + if (powerclamp_data.clamping) { + ret = -EAGAIN; + goto skip_limit_set; + } + + ret = kstrtou8(arg, 10, &new_max_idle); + if (ret) + goto skip_limit_set; + + if (new_max_idle > MAX_TARGET_RATIO) { + ret = -EINVAL; + goto skip_limit_set; + } + + if (check_invalid(idle_injection_cpu_mask, new_max_idle)) { + ret = -EINVAL; + goto skip_limit_set; + } + + max_idle = new_max_idle; + +skip_limit_set: + mutex_unlock(&powerclamp_lock); + + return ret; +} + +static const struct kernel_param_ops max_idle_ops = { + .set = max_idle_set, + .get = param_get_int, +}; + +module_param_cb(max_idle, &max_idle_ops, &max_idle, 0644); +MODULE_PARM_DESC(max_idle, "maximum injected idle time to the total CPU time ratio in percent range:1-100"); + struct powerclamp_calibration_data { unsigned long confidence; /* used for calibration, basically a counter * gets incremented each time a clamping @@ -472,21 +607,15 @@ static void trigger_idle_injection(void) */ static int powerclamp_idle_injection_register(void) { - /* - * The idle inject core will only inject for online CPUs, - * So we can register for all present CPUs. In this way - * if some CPU goes online/offline while idle inject - * is registered, nothing additional calls are required. - * The same runtime and idle time is applicable for - * newly onlined CPUs if any. - * - * Here cpu_present_mask can be used as is. - * cast to (struct cpumask *) is required as the - * cpu_present_mask is const struct cpumask *, otherwise - * there will be compiler warnings. - */ - ii_dev = idle_inject_register_full((struct cpumask *)cpu_present_mask, - idle_inject_update); + poll_pkg_cstate_enable = false; + if (cpumask_equal(cpu_present_mask, idle_injection_cpu_mask)) { + ii_dev = idle_inject_register_full(idle_injection_cpu_mask, idle_inject_update); + if (topology_max_packages() == 1 && topology_max_die_per_package() == 1) + poll_pkg_cstate_enable = true; + } else { + ii_dev = idle_inject_register(idle_injection_cpu_mask); + } + if (!ii_dev) { pr_err("powerclamp: idle_inject_register failed\n"); return -EAGAIN; @@ -567,7 +696,7 @@ static int powerclamp_set_cur_state(struct thermal_cooling_device *cdev, mutex_lock(&powerclamp_lock); new_target_ratio = clamp(new_target_ratio, 0UL, - (unsigned long) (MAX_TARGET_RATIO - 1)); + (unsigned long) (max_idle - 1)); if (!powerclamp_data.target_ratio && new_target_ratio > 0) { pr_info("Start idle injection to reduce power\n"); powerclamp_data.target_ratio = new_target_ratio; @@ -661,12 +790,16 @@ static int __init powerclamp_init(void) if (retval) return retval; + mutex_lock(&powerclamp_lock); + retval = allocate_copy_idle_injection_mask(cpu_present_mask); + mutex_unlock(&powerclamp_lock); + + if (retval) + return retval; + /* set default limit, maybe adjusted during runtime based on feedback */ window_size = 2; - if (topology_max_packages() == 1 && topology_max_die_per_package() == 1) - poll_pkg_cstate_enable = true; - cooling_dev = thermal_cooling_device_register("intel_powerclamp", NULL, &powerclamp_cooling_ops); if (IS_ERR(cooling_dev)) @@ -691,6 +824,9 @@ static void __exit powerclamp_exit(void) cancel_delayed_work_sync(&poll_pkg_cstate_work); debugfs_remove_recursive(debug_dir); + + if (cpumask_available(idle_injection_cpu_mask)) + free_cpumask_var(idle_injection_cpu_mask); } module_exit(powerclamp_exit); |