// SPDX-License-Identifier: GPL-2.0 /* * DAMON sysfs Interface * * Copyright (c) 2022 SeongJae Park */ #include #include #include #include #include static DEFINE_MUTEX(damon_sysfs_lock); /* * unsigned long range directory */ struct damon_sysfs_ul_range { struct kobject kobj; unsigned long min; unsigned long max; }; static struct damon_sysfs_ul_range *damon_sysfs_ul_range_alloc( unsigned long min, unsigned long max) { struct damon_sysfs_ul_range *range = kmalloc(sizeof(*range), GFP_KERNEL); if (!range) return NULL; range->kobj = (struct kobject){}; range->min = min; range->max = max; return range; } static ssize_t min_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_ul_range *range = container_of(kobj, struct damon_sysfs_ul_range, kobj); return sysfs_emit(buf, "%lu\n", range->min); } static ssize_t min_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_ul_range *range = container_of(kobj, struct damon_sysfs_ul_range, kobj); unsigned long min; int err; err = kstrtoul(buf, 0, &min); if (err) return -EINVAL; range->min = min; return count; } static ssize_t max_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_ul_range *range = container_of(kobj, struct damon_sysfs_ul_range, kobj); return sysfs_emit(buf, "%lu\n", range->max); } static ssize_t max_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_ul_range *range = container_of(kobj, struct damon_sysfs_ul_range, kobj); unsigned long max; int err; err = kstrtoul(buf, 0, &max); if (err) return -EINVAL; range->max = max; return count; } static void damon_sysfs_ul_range_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_ul_range, kobj)); } static struct kobj_attribute damon_sysfs_ul_range_min_attr = __ATTR_RW_MODE(min, 0600); static struct kobj_attribute damon_sysfs_ul_range_max_attr = __ATTR_RW_MODE(max, 0600); static struct attribute *damon_sysfs_ul_range_attrs[] = { &damon_sysfs_ul_range_min_attr.attr, &damon_sysfs_ul_range_max_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_ul_range); static struct kobj_type damon_sysfs_ul_range_ktype = { .release = damon_sysfs_ul_range_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_ul_range_groups, }; /* * schemes/stats directory */ struct damon_sysfs_stats { struct kobject kobj; unsigned long nr_tried; unsigned long sz_tried; unsigned long nr_applied; unsigned long sz_applied; unsigned long qt_exceeds; }; static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_stats), GFP_KERNEL); } static ssize_t nr_tried_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->nr_tried); } static ssize_t sz_tried_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->sz_tried); } static ssize_t nr_applied_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->nr_applied); } static ssize_t sz_applied_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->sz_applied); } static ssize_t qt_exceeds_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->qt_exceeds); } static void damon_sysfs_stats_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_stats, kobj)); } static struct kobj_attribute damon_sysfs_stats_nr_tried_attr = __ATTR_RO_MODE(nr_tried, 0400); static struct kobj_attribute damon_sysfs_stats_sz_tried_attr = __ATTR_RO_MODE(sz_tried, 0400); static struct kobj_attribute damon_sysfs_stats_nr_applied_attr = __ATTR_RO_MODE(nr_applied, 0400); static struct kobj_attribute damon_sysfs_stats_sz_applied_attr = __ATTR_RO_MODE(sz_applied, 0400); static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr = __ATTR_RO_MODE(qt_exceeds, 0400); static struct attribute *damon_sysfs_stats_attrs[] = { &damon_sysfs_stats_nr_tried_attr.attr, &damon_sysfs_stats_sz_tried_attr.attr, &damon_sysfs_stats_nr_applied_attr.attr, &damon_sysfs_stats_sz_applied_attr.attr, &damon_sysfs_stats_qt_exceeds_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_stats); static struct kobj_type damon_sysfs_stats_ktype = { .release = damon_sysfs_stats_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_stats_groups, }; /* * watermarks directory */ struct damon_sysfs_watermarks { struct kobject kobj; enum damos_wmark_metric metric; unsigned long interval_us; unsigned long high; unsigned long mid; unsigned long low; }; static struct damon_sysfs_watermarks *damon_sysfs_watermarks_alloc( enum damos_wmark_metric metric, unsigned long interval_us, unsigned long high, unsigned long mid, unsigned long low) { struct damon_sysfs_watermarks *watermarks = kmalloc( sizeof(*watermarks), GFP_KERNEL); if (!watermarks) return NULL; watermarks->kobj = (struct kobject){}; watermarks->metric = metric; watermarks->interval_us = interval_us; watermarks->high = high; watermarks->mid = mid; watermarks->low = low; return watermarks; } /* Should match with enum damos_wmark_metric */ static const char * const damon_sysfs_wmark_metric_strs[] = { "none", "free_mem_rate", }; static ssize_t metric_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%s\n", damon_sysfs_wmark_metric_strs[watermarks->metric]); } static ssize_t metric_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); enum damos_wmark_metric metric; for (metric = 0; metric < NR_DAMOS_WMARK_METRICS; metric++) { if (sysfs_streq(buf, damon_sysfs_wmark_metric_strs[metric])) { watermarks->metric = metric; return count; } } return -EINVAL; } static ssize_t interval_us_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%lu\n", watermarks->interval_us); } static ssize_t interval_us_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); int err = kstrtoul(buf, 0, &watermarks->interval_us); if (err) return -EINVAL; return count; } static ssize_t high_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%lu\n", watermarks->high); } static ssize_t high_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); int err = kstrtoul(buf, 0, &watermarks->high); if (err) return -EINVAL; return count; } static ssize_t mid_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%lu\n", watermarks->mid); } static ssize_t mid_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); int err = kstrtoul(buf, 0, &watermarks->mid); if (err) return -EINVAL; return count; } static ssize_t low_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%lu\n", watermarks->low); } static ssize_t low_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); int err = kstrtoul(buf, 0, &watermarks->low); if (err) return -EINVAL; return count; } static void damon_sysfs_watermarks_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_watermarks, kobj)); } static struct kobj_attribute damon_sysfs_watermarks_metric_attr = __ATTR_RW_MODE(metric, 0600); static struct kobj_attribute damon_sysfs_watermarks_interval_us_attr = __ATTR_RW_MODE(interval_us, 0600); static struct kobj_attribute damon_sysfs_watermarks_high_attr = __ATTR_RW_MODE(high, 0600); static struct kobj_attribute damon_sysfs_watermarks_mid_attr = __ATTR_RW_MODE(mid, 0600); static struct kobj_attribute damon_sysfs_watermarks_low_attr = __ATTR_RW_MODE(low, 0600); static struct attribute *damon_sysfs_watermarks_attrs[] = { &damon_sysfs_watermarks_metric_attr.attr, &damon_sysfs_watermarks_interval_us_attr.attr, &damon_sysfs_watermarks_high_attr.attr, &damon_sysfs_watermarks_mid_attr.attr, &damon_sysfs_watermarks_low_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_watermarks); static struct kobj_type damon_sysfs_watermarks_ktype = { .release = damon_sysfs_watermarks_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_watermarks_groups, }; /* * scheme/weights directory */ struct damon_sysfs_weights { struct kobject kobj; unsigned int sz; unsigned int nr_accesses; unsigned int age; }; static struct damon_sysfs_weights *damon_sysfs_weights_alloc(unsigned int sz, unsigned int nr_accesses, unsigned int age) { struct damon_sysfs_weights *weights = kmalloc(sizeof(*weights), GFP_KERNEL); if (!weights) return NULL; weights->kobj = (struct kobject){}; weights->sz = sz; weights->nr_accesses = nr_accesses; weights->age = age; return weights; } static ssize_t sz_permil_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); return sysfs_emit(buf, "%u\n", weights->sz); } static ssize_t sz_permil_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); int err = kstrtouint(buf, 0, &weights->sz); if (err) return -EINVAL; return count; } static ssize_t nr_accesses_permil_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); return sysfs_emit(buf, "%u\n", weights->nr_accesses); } static ssize_t nr_accesses_permil_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); int err = kstrtouint(buf, 0, &weights->nr_accesses); if (err) return -EINVAL; return count; } static ssize_t age_permil_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); return sysfs_emit(buf, "%u\n", weights->age); } static ssize_t age_permil_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); int err = kstrtouint(buf, 0, &weights->age); if (err) return -EINVAL; return count; } static void damon_sysfs_weights_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_weights, kobj)); } static struct kobj_attribute damon_sysfs_weights_sz_attr = __ATTR_RW_MODE(sz_permil, 0600); static struct kobj_attribute damon_sysfs_weights_nr_accesses_attr = __ATTR_RW_MODE(nr_accesses_permil, 0600); static struct kobj_attribute damon_sysfs_weights_age_attr = __ATTR_RW_MODE(age_permil, 0600); static struct attribute *damon_sysfs_weights_attrs[] = { &damon_sysfs_weights_sz_attr.attr, &damon_sysfs_weights_nr_accesses_attr.attr, &damon_sysfs_weights_age_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_weights); static struct kobj_type damon_sysfs_weights_ktype = { .release = damon_sysfs_weights_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_weights_groups, }; /* * quotas directory */ struct damon_sysfs_quotas { struct kobject kobj; struct damon_sysfs_weights *weights; unsigned long ms; unsigned long sz; unsigned long reset_interval_ms; }; static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_quotas), GFP_KERNEL); } static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas) { struct damon_sysfs_weights *weights; int err; weights = damon_sysfs_weights_alloc(0, 0, 0); if (!weights) return -ENOMEM; err = kobject_init_and_add(&weights->kobj, &damon_sysfs_weights_ktype, "as->kobj, "weights"); if (err) kobject_put(&weights->kobj); else quotas->weights = weights; return err; } static void damon_sysfs_quotas_rm_dirs(struct damon_sysfs_quotas *quotas) { kobject_put("as->weights->kobj); } static ssize_t ms_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); return sysfs_emit(buf, "%lu\n", quotas->ms); } static ssize_t ms_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); int err = kstrtoul(buf, 0, "as->ms); if (err) return -EINVAL; return count; } static ssize_t bytes_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); return sysfs_emit(buf, "%lu\n", quotas->sz); } static ssize_t bytes_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); int err = kstrtoul(buf, 0, "as->sz); if (err) return -EINVAL; return count; } static ssize_t reset_interval_ms_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); return sysfs_emit(buf, "%lu\n", quotas->reset_interval_ms); } static ssize_t reset_interval_ms_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); int err = kstrtoul(buf, 0, "as->reset_interval_ms); if (err) return -EINVAL; return count; } static void damon_sysfs_quotas_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_quotas, kobj)); } static struct kobj_attribute damon_sysfs_quotas_ms_attr = __ATTR_RW_MODE(ms, 0600); static struct kobj_attribute damon_sysfs_quotas_sz_attr = __ATTR_RW_MODE(bytes, 0600); static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr = __ATTR_RW_MODE(reset_interval_ms, 0600); static struct attribute *damon_sysfs_quotas_attrs[] = { &damon_sysfs_quotas_ms_attr.attr, &damon_sysfs_quotas_sz_attr.attr, &damon_sysfs_quotas_reset_interval_ms_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_quotas); static struct kobj_type damon_sysfs_quotas_ktype = { .release = damon_sysfs_quotas_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_quotas_groups, }; /* * access_pattern directory */ struct damon_sysfs_access_pattern { struct kobject kobj; struct damon_sysfs_ul_range *sz; struct damon_sysfs_ul_range *nr_accesses; struct damon_sysfs_ul_range *age; }; static struct damon_sysfs_access_pattern *damon_sysfs_access_pattern_alloc(void) { struct damon_sysfs_access_pattern *access_pattern = kmalloc(sizeof(*access_pattern), GFP_KERNEL); if (!access_pattern) return NULL; access_pattern->kobj = (struct kobject){}; return access_pattern; } static int damon_sysfs_access_pattern_add_range_dir( struct damon_sysfs_access_pattern *access_pattern, struct damon_sysfs_ul_range **range_dir_ptr, char *name) { struct damon_sysfs_ul_range *range = damon_sysfs_ul_range_alloc(0, 0); int err; if (!range) return -ENOMEM; err = kobject_init_and_add(&range->kobj, &damon_sysfs_ul_range_ktype, &access_pattern->kobj, name); if (err) kobject_put(&range->kobj); else *range_dir_ptr = range; return err; } static int damon_sysfs_access_pattern_add_dirs( struct damon_sysfs_access_pattern *access_pattern) { int err; err = damon_sysfs_access_pattern_add_range_dir(access_pattern, &access_pattern->sz, "sz"); if (err) goto put_sz_out; err = damon_sysfs_access_pattern_add_range_dir(access_pattern, &access_pattern->nr_accesses, "nr_accesses"); if (err) goto put_nr_accesses_sz_out; err = damon_sysfs_access_pattern_add_range_dir(access_pattern, &access_pattern->age, "age"); if (err) goto put_age_nr_accesses_sz_out; return 0; put_age_nr_accesses_sz_out: kobject_put(&access_pattern->age->kobj); access_pattern->age = NULL; put_nr_accesses_sz_out: kobject_put(&access_pattern->nr_accesses->kobj); access_pattern->nr_accesses = NULL; put_sz_out: kobject_put(&access_pattern->sz->kobj); access_pattern->sz = NULL; return err; } static void damon_sysfs_access_pattern_rm_dirs( struct damon_sysfs_access_pattern *access_pattern) { kobject_put(&access_pattern->sz->kobj); kobject_put(&access_pattern->nr_accesses->kobj); kobject_put(&access_pattern->age->kobj); } static void damon_sysfs_access_pattern_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_access_pattern, kobj)); } static struct attribute *damon_sysfs_access_pattern_attrs[] = { NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_access_pattern); static struct kobj_type damon_sysfs_access_pattern_ktype = { .release = damon_sysfs_access_pattern_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_access_pattern_groups, }; /* * scheme directory */ struct damon_sysfs_scheme { struct kobject kobj; enum damos_action action; struct damon_sysfs_access_pattern *access_pattern; struct damon_sysfs_quotas *quotas; struct damon_sysfs_watermarks *watermarks; struct damon_sysfs_stats *stats; }; /* This should match with enum damos_action */ static const char * const damon_sysfs_damos_action_strs[] = { "willneed", "cold", "pageout", "hugepage", "nohugepage", "lru_prio", "lru_deprio", "stat", }; static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc( enum damos_action action) { struct damon_sysfs_scheme *scheme = kmalloc(sizeof(*scheme), GFP_KERNEL); if (!scheme) return NULL; scheme->kobj = (struct kobject){}; scheme->action = action; return scheme; } static int damon_sysfs_scheme_set_access_pattern( struct damon_sysfs_scheme *scheme) { struct damon_sysfs_access_pattern *access_pattern; int err; access_pattern = damon_sysfs_access_pattern_alloc(); if (!access_pattern) return -ENOMEM; err = kobject_init_and_add(&access_pattern->kobj, &damon_sysfs_access_pattern_ktype, &scheme->kobj, "access_pattern"); if (err) goto out; err = damon_sysfs_access_pattern_add_dirs(access_pattern); if (err) goto out; scheme->access_pattern = access_pattern; return 0; out: kobject_put(&access_pattern->kobj); return err; } static int damon_sysfs_scheme_set_quotas(struct damon_sysfs_scheme *scheme) { struct damon_sysfs_quotas *quotas = damon_sysfs_quotas_alloc(); int err; if (!quotas) return -ENOMEM; err = kobject_init_and_add("as->kobj, &damon_sysfs_quotas_ktype, &scheme->kobj, "quotas"); if (err) goto out; err = damon_sysfs_quotas_add_dirs(quotas); if (err) goto out; scheme->quotas = quotas; return 0; out: kobject_put("as->kobj); return err; } static int damon_sysfs_scheme_set_watermarks(struct damon_sysfs_scheme *scheme) { struct damon_sysfs_watermarks *watermarks = damon_sysfs_watermarks_alloc(DAMOS_WMARK_NONE, 0, 0, 0, 0); int err; if (!watermarks) return -ENOMEM; err = kobject_init_and_add(&watermarks->kobj, &damon_sysfs_watermarks_ktype, &scheme->kobj, "watermarks"); if (err) kobject_put(&watermarks->kobj); else scheme->watermarks = watermarks; return err; } static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme) { struct damon_sysfs_stats *stats = damon_sysfs_stats_alloc(); int err; if (!stats) return -ENOMEM; err = kobject_init_and_add(&stats->kobj, &damon_sysfs_stats_ktype, &scheme->kobj, "stats"); if (err) kobject_put(&stats->kobj); else scheme->stats = stats; return err; } static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme) { int err; err = damon_sysfs_scheme_set_access_pattern(scheme); if (err) return err; err = damon_sysfs_scheme_set_quotas(scheme); if (err) goto put_access_pattern_out; err = damon_sysfs_scheme_set_watermarks(scheme); if (err) goto put_quotas_access_pattern_out; err = damon_sysfs_scheme_set_stats(scheme); if (err) goto put_watermarks_quotas_access_pattern_out; return 0; put_watermarks_quotas_access_pattern_out: kobject_put(&scheme->watermarks->kobj); scheme->watermarks = NULL; put_quotas_access_pattern_out: kobject_put(&scheme->quotas->kobj); scheme->quotas = NULL; put_access_pattern_out: kobject_put(&scheme->access_pattern->kobj); scheme->access_pattern = NULL; return err; } static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme) { damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern); kobject_put(&scheme->access_pattern->kobj); damon_sysfs_quotas_rm_dirs(scheme->quotas); kobject_put(&scheme->quotas->kobj); kobject_put(&scheme->watermarks->kobj); kobject_put(&scheme->stats->kobj); } static ssize_t action_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme *scheme = container_of(kobj, struct damon_sysfs_scheme, kobj); return sysfs_emit(buf, "%s\n", damon_sysfs_damos_action_strs[scheme->action]); } static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme *scheme = container_of(kobj, struct damon_sysfs_scheme, kobj); enum damos_action action; for (action = 0; action < NR_DAMOS_ACTIONS; action++) { if (sysfs_streq(buf, damon_sysfs_damos_action_strs[action])) { scheme->action = action; return count; } } return -EINVAL; } static void damon_sysfs_scheme_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_scheme, kobj)); } static struct kobj_attribute damon_sysfs_scheme_action_attr = __ATTR_RW_MODE(action, 0600); static struct attribute *damon_sysfs_scheme_attrs[] = { &damon_sysfs_scheme_action_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_scheme); static struct kobj_type damon_sysfs_scheme_ktype = { .release = damon_sysfs_scheme_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_scheme_groups, }; /* * schemes directory */ struct damon_sysfs_schemes { struct kobject kobj; struct damon_sysfs_scheme **schemes_arr; int nr; }; static struct damon_sysfs_schemes *damon_sysfs_schemes_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_schemes), GFP_KERNEL); } static void damon_sysfs_schemes_rm_dirs(struct damon_sysfs_schemes *schemes) { struct damon_sysfs_scheme **schemes_arr = schemes->schemes_arr; int i; for (i = 0; i < schemes->nr; i++) { damon_sysfs_scheme_rm_dirs(schemes_arr[i]); kobject_put(&schemes_arr[i]->kobj); } schemes->nr = 0; kfree(schemes_arr); schemes->schemes_arr = NULL; } static int damon_sysfs_schemes_add_dirs(struct damon_sysfs_schemes *schemes, int nr_schemes) { struct damon_sysfs_scheme **schemes_arr, *scheme; int err, i; damon_sysfs_schemes_rm_dirs(schemes); if (!nr_schemes) return 0; schemes_arr = kmalloc_array(nr_schemes, sizeof(*schemes_arr), GFP_KERNEL | __GFP_NOWARN); if (!schemes_arr) return -ENOMEM; schemes->schemes_arr = schemes_arr; for (i = 0; i < nr_schemes; i++) { scheme = damon_sysfs_scheme_alloc(DAMOS_STAT); if (!scheme) { damon_sysfs_schemes_rm_dirs(schemes); return -ENOMEM; } err = kobject_init_and_add(&scheme->kobj, &damon_sysfs_scheme_ktype, &schemes->kobj, "%d", i); if (err) goto out; err = damon_sysfs_scheme_add_dirs(scheme); if (err) goto out; schemes_arr[i] = scheme; schemes->nr++; } return 0; out: damon_sysfs_schemes_rm_dirs(schemes); kobject_put(&scheme->kobj); return err; } static ssize_t nr_schemes_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_schemes *schemes = container_of(kobj, struct damon_sysfs_schemes, kobj); return sysfs_emit(buf, "%d\n", schemes->nr); } static ssize_t nr_schemes_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_schemes *schemes = container_of(kobj, struct damon_sysfs_schemes, kobj); int nr, err = kstrtoint(buf, 0, &nr); if (err) return err; if (nr < 0) return -EINVAL; if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; err = damon_sysfs_schemes_add_dirs(schemes, nr); mutex_unlock(&damon_sysfs_lock); if (err) return err; return count; } static void damon_sysfs_schemes_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_schemes, kobj)); } static struct kobj_attribute damon_sysfs_schemes_nr_attr = __ATTR_RW_MODE(nr_schemes, 0600); static struct attribute *damon_sysfs_schemes_attrs[] = { &damon_sysfs_schemes_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_schemes); static struct kobj_type damon_sysfs_schemes_ktype = { .release = damon_sysfs_schemes_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_schemes_groups, }; /* * init region directory */ struct damon_sysfs_region { struct kobject kobj; unsigned long start; unsigned long end; }; static struct damon_sysfs_region *damon_sysfs_region_alloc( unsigned long start, unsigned long end) { struct damon_sysfs_region *region = kmalloc(sizeof(*region), GFP_KERNEL); if (!region) return NULL; region->kobj = (struct kobject){}; region->start = start; region->end = end; return region; } static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_region *region = container_of(kobj, struct damon_sysfs_region, kobj); return sysfs_emit(buf, "%lu\n", region->start); } static ssize_t start_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_region *region = container_of(kobj, struct damon_sysfs_region, kobj); int err = kstrtoul(buf, 0, ®ion->start); if (err) return -EINVAL; return count; } static ssize_t end_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_region *region = container_of(kobj, struct damon_sysfs_region, kobj); return sysfs_emit(buf, "%lu\n", region->end); } static ssize_t end_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_region *region = container_of(kobj, struct damon_sysfs_region, kobj); int err = kstrtoul(buf, 0, ®ion->end); if (err) return -EINVAL; return count; } static void damon_sysfs_region_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_region, kobj)); } static struct kobj_attribute damon_sysfs_region_start_attr = __ATTR_RW_MODE(start, 0600); static struct kobj_attribute damon_sysfs_region_end_attr = __ATTR_RW_MODE(end, 0600); static struct attribute *damon_sysfs_region_attrs[] = { &damon_sysfs_region_start_attr.attr, &damon_sysfs_region_end_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_region); static struct kobj_type damon_sysfs_region_ktype = { .release = damon_sysfs_region_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_region_groups, }; /* * init_regions directory */ struct damon_sysfs_regions { struct kobject kobj; struct damon_sysfs_region **regions_arr; int nr; }; static struct damon_sysfs_regions *damon_sysfs_regions_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_regions), GFP_KERNEL); } static void damon_sysfs_regions_rm_dirs(struct damon_sysfs_regions *regions) { struct damon_sysfs_region **regions_arr = regions->regions_arr; int i; for (i = 0; i < regions->nr; i++) kobject_put(®ions_arr[i]->kobj); regions->nr = 0; kfree(regions_arr); regions->regions_arr = NULL; } static int damon_sysfs_regions_add_dirs(struct damon_sysfs_regions *regions, int nr_regions) { struct damon_sysfs_region **regions_arr, *region; int err, i; damon_sysfs_regions_rm_dirs(regions); if (!nr_regions) return 0; regions_arr = kmalloc_array(nr_regions, sizeof(*regions_arr), GFP_KERNEL | __GFP_NOWARN); if (!regions_arr) return -ENOMEM; regions->regions_arr = regions_arr; for (i = 0; i < nr_regions; i++) { region = damon_sysfs_region_alloc(0, 0); if (!region) { damon_sysfs_regions_rm_dirs(regions); return -ENOMEM; } err = kobject_init_and_add(®ion->kobj, &damon_sysfs_region_ktype, ®ions->kobj, "%d", i); if (err) { kobject_put(®ion->kobj); damon_sysfs_regions_rm_dirs(regions); return err; } regions_arr[i] = region; regions->nr++; } return 0; } static ssize_t nr_regions_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_regions *regions = container_of(kobj, struct damon_sysfs_regions, kobj); return sysfs_emit(buf, "%d\n", regions->nr); } static ssize_t nr_regions_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_regions *regions = container_of(kobj, struct damon_sysfs_regions, kobj); int nr, err = kstrtoint(buf, 0, &nr); if (err) return err; if (nr < 0) return -EINVAL; if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; err = damon_sysfs_regions_add_dirs(regions, nr); mutex_unlock(&damon_sysfs_lock); if (err) return err; return count; } static void damon_sysfs_regions_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_regions, kobj)); } static struct kobj_attribute damon_sysfs_regions_nr_attr = __ATTR_RW_MODE(nr_regions, 0600); static struct attribute *damon_sysfs_regions_attrs[] = { &damon_sysfs_regions_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_regions); static struct kobj_type damon_sysfs_regions_ktype = { .release = damon_sysfs_regions_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_regions_groups, }; /* * target directory */ struct damon_sysfs_target { struct kobject kobj; struct damon_sysfs_regions *regions; int pid; }; static struct damon_sysfs_target *damon_sysfs_target_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_target), GFP_KERNEL); } static int damon_sysfs_target_add_dirs(struct damon_sysfs_target *target) { struct damon_sysfs_regions *regions = damon_sysfs_regions_alloc(); int err; if (!regions) return -ENOMEM; err = kobject_init_and_add(®ions->kobj, &damon_sysfs_regions_ktype, &target->kobj, "regions"); if (err) kobject_put(®ions->kobj); else target->regions = regions; return err; } static void damon_sysfs_target_rm_dirs(struct damon_sysfs_target *target) { damon_sysfs_regions_rm_dirs(target->regions); kobject_put(&target->regions->kobj); } static ssize_t pid_target_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_target *target = container_of(kobj, struct damon_sysfs_target, kobj); return sysfs_emit(buf, "%d\n", target->pid); } static ssize_t pid_target_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_target *target = container_of(kobj, struct damon_sysfs_target, kobj); int err = kstrtoint(buf, 0, &target->pid); if (err) return -EINVAL; return count; } static void damon_sysfs_target_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_target, kobj)); } static struct kobj_attribute damon_sysfs_target_pid_attr = __ATTR_RW_MODE(pid_target, 0600); static struct attribute *damon_sysfs_target_attrs[] = { &damon_sysfs_target_pid_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_target); static struct kobj_type damon_sysfs_target_ktype = { .release = damon_sysfs_target_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_target_groups, }; /* * targets directory */ struct damon_sysfs_targets { struct kobject kobj; struct damon_sysfs_target **targets_arr; int nr; }; static struct damon_sysfs_targets *damon_sysfs_targets_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_targets), GFP_KERNEL); } static void damon_sysfs_targets_rm_dirs(struct damon_sysfs_targets *targets) { struct damon_sysfs_target **targets_arr = targets->targets_arr; int i; for (i = 0; i < targets->nr; i++) { damon_sysfs_target_rm_dirs(targets_arr[i]); kobject_put(&targets_arr[i]->kobj); } targets->nr = 0; kfree(targets_arr); targets->targets_arr = NULL; } static int damon_sysfs_targets_add_dirs(struct damon_sysfs_targets *targets, int nr_targets) { struct damon_sysfs_target **targets_arr, *target; int err, i; damon_sysfs_targets_rm_dirs(targets); if (!nr_targets) return 0; targets_arr = kmalloc_array(nr_targets, sizeof(*targets_arr), GFP_KERNEL | __GFP_NOWARN); if (!targets_arr) return -ENOMEM; targets->targets_arr = targets_arr; for (i = 0; i < nr_targets; i++) { target = damon_sysfs_target_alloc(); if (!target) { damon_sysfs_targets_rm_dirs(targets); return -ENOMEM; } err = kobject_init_and_add(&target->kobj, &damon_sysfs_target_ktype, &targets->kobj, "%d", i); if (err) goto out; err = damon_sysfs_target_add_dirs(target); if (err) goto out; targets_arr[i] = target; targets->nr++; } return 0; out: damon_sysfs_targets_rm_dirs(targets); kobject_put(&target->kobj); return err; } static ssize_t nr_targets_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_targets *targets = container_of(kobj, struct damon_sysfs_targets, kobj); return sysfs_emit(buf, "%d\n", targets->nr); } static ssize_t nr_targets_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_targets *targets = container_of(kobj, struct damon_sysfs_targets, kobj); int nr, err = kstrtoint(buf, 0, &nr); if (err) return err; if (nr < 0) return -EINVAL; if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; err = damon_sysfs_targets_add_dirs(targets, nr); mutex_unlock(&damon_sysfs_lock); if (err) return err; return count; } static void damon_sysfs_targets_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_targets, kobj)); } static struct kobj_attribute damon_sysfs_targets_nr_attr = __ATTR_RW_MODE(nr_targets, 0600); static struct attribute *damon_sysfs_targets_attrs[] = { &damon_sysfs_targets_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_targets); static struct kobj_type damon_sysfs_targets_ktype = { .release = damon_sysfs_targets_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_targets_groups, }; /* * intervals directory */ struct damon_sysfs_intervals { struct kobject kobj; unsigned long sample_us; unsigned long aggr_us; unsigned long update_us; }; static struct damon_sysfs_intervals *damon_sysfs_intervals_alloc( unsigned long sample_us, unsigned long aggr_us, unsigned long update_us) { struct damon_sysfs_intervals *intervals = kmalloc(sizeof(*intervals), GFP_KERNEL); if (!intervals) return NULL; intervals->kobj = (struct kobject){}; intervals->sample_us = sample_us; intervals->aggr_us = aggr_us; intervals->update_us = update_us; return intervals; } static ssize_t sample_us_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_intervals *intervals = container_of(kobj, struct damon_sysfs_intervals, kobj); return sysfs_emit(buf, "%lu\n", intervals->sample_us); } static ssize_t sample_us_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_intervals *intervals = container_of(kobj, struct damon_sysfs_intervals, kobj); unsigned long us; int err = kstrtoul(buf, 0, &us); if (err) return -EINVAL; intervals->sample_us = us; return count; } static ssize_t aggr_us_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_intervals *intervals = container_of(kobj, struct damon_sysfs_intervals, kobj); return sysfs_emit(buf, "%lu\n", intervals->aggr_us); } static ssize_t aggr_us_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_intervals *intervals = container_of(kobj, struct damon_sysfs_intervals, kobj); unsigned long us; int err = kstrtoul(buf, 0, &us); if (err) return -EINVAL; intervals->aggr_us = us; return count; } static ssize_t update_us_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_intervals *intervals = container_of(kobj, struct damon_sysfs_intervals, kobj); return sysfs_emit(buf, "%lu\n", intervals->update_us); } static ssize_t update_us_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_intervals *intervals = container_of(kobj, struct damon_sysfs_intervals, kobj); unsigned long us; int err = kstrtoul(buf, 0, &us); if (err) return -EINVAL; intervals->update_us = us; return count; } static void damon_sysfs_intervals_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_intervals, kobj)); } static struct kobj_attribute damon_sysfs_intervals_sample_us_attr = __ATTR_RW_MODE(sample_us, 0600); static struct kobj_attribute damon_sysfs_intervals_aggr_us_attr = __ATTR_RW_MODE(aggr_us, 0600); static struct kobj_attribute damon_sysfs_intervals_update_us_attr = __ATTR_RW_MODE(update_us, 0600); static struct attribute *damon_sysfs_intervals_attrs[] = { &damon_sysfs_intervals_sample_us_attr.attr, &damon_sysfs_intervals_aggr_us_attr.attr, &damon_sysfs_intervals_update_us_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_intervals); static struct kobj_type damon_sysfs_intervals_ktype = { .release = damon_sysfs_intervals_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_intervals_groups, }; /* * monitoring_attrs directory */ struct damon_sysfs_attrs { struct kobject kobj; struct damon_sysfs_intervals *intervals; struct damon_sysfs_ul_range *nr_regions_range; }; static struct damon_sysfs_attrs *damon_sysfs_attrs_alloc(void) { struct damon_sysfs_attrs *attrs = kmalloc(sizeof(*attrs), GFP_KERNEL); if (!attrs) return NULL; attrs->kobj = (struct kobject){}; return attrs; } static int damon_sysfs_attrs_add_dirs(struct damon_sysfs_attrs *attrs) { struct damon_sysfs_intervals *intervals; struct damon_sysfs_ul_range *nr_regions_range; int err; intervals = damon_sysfs_intervals_alloc(5000, 100000, 60000000); if (!intervals) return -ENOMEM; err = kobject_init_and_add(&intervals->kobj, &damon_sysfs_intervals_ktype, &attrs->kobj, "intervals"); if (err) goto put_intervals_out; attrs->intervals = intervals; nr_regions_range = damon_sysfs_ul_range_alloc(10, 1000); if (!nr_regions_range) { err = -ENOMEM; goto put_intervals_out; } err = kobject_init_and_add(&nr_regions_range->kobj, &damon_sysfs_ul_range_ktype, &attrs->kobj, "nr_regions"); if (err) goto put_nr_regions_intervals_out; attrs->nr_regions_range = nr_regions_range; return 0; put_nr_regions_intervals_out: kobject_put(&nr_regions_range->kobj); attrs->nr_regions_range = NULL; put_intervals_out: kobject_put(&intervals->kobj); attrs->intervals = NULL; return err; } static void damon_sysfs_attrs_rm_dirs(struct damon_sysfs_attrs *attrs) { kobject_put(&attrs->nr_regions_range->kobj); kobject_put(&attrs->intervals->kobj); } static void damon_sysfs_attrs_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_attrs, kobj)); } static struct attribute *damon_sysfs_attrs_attrs[] = { NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_attrs); static struct kobj_type damon_sysfs_attrs_ktype = { .release = damon_sysfs_attrs_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_attrs_groups, }; /* * context directory */ /* This should match with enum damon_ops_id */ static const char * const damon_sysfs_ops_strs[] = { "vaddr", "fvaddr", "paddr", }; struct damon_sysfs_context { struct kobject kobj; enum damon_ops_id ops_id; struct damon_sysfs_attrs *attrs; struct damon_sysfs_targets *targets; struct damon_sysfs_schemes *schemes; }; static struct damon_sysfs_context *damon_sysfs_context_alloc( enum damon_ops_id ops_id) { struct damon_sysfs_context *context = kmalloc(sizeof(*context), GFP_KERNEL); if (!context) return NULL; context->kobj = (struct kobject){}; context->ops_id = ops_id; return context; } static int damon_sysfs_context_set_attrs(struct damon_sysfs_context *context) { struct damon_sysfs_attrs *attrs = damon_sysfs_attrs_alloc(); int err; if (!attrs) return -ENOMEM; err = kobject_init_and_add(&attrs->kobj, &damon_sysfs_attrs_ktype, &context->kobj, "monitoring_attrs"); if (err) goto out; err = damon_sysfs_attrs_add_dirs(attrs); if (err) goto out; context->attrs = attrs; return 0; out: kobject_put(&attrs->kobj); return err; } static int damon_sysfs_context_set_targets(struct damon_sysfs_context *context) { struct damon_sysfs_targets *targets = damon_sysfs_targets_alloc(); int err; if (!targets) return -ENOMEM; err = kobject_init_and_add(&targets->kobj, &damon_sysfs_targets_ktype, &context->kobj, "targets"); if (err) { kobject_put(&targets->kobj); return err; } context->targets = targets; return 0; } static int damon_sysfs_context_set_schemes(struct damon_sysfs_context *context) { struct damon_sysfs_schemes *schemes = damon_sysfs_schemes_alloc(); int err; if (!schemes) return -ENOMEM; err = kobject_init_and_add(&schemes->kobj, &damon_sysfs_schemes_ktype, &context->kobj, "schemes"); if (err) { kobject_put(&schemes->kobj); return err; } context->schemes = schemes; return 0; } static int damon_sysfs_context_add_dirs(struct damon_sysfs_context *context) { int err; err = damon_sysfs_context_set_attrs(context); if (err) return err; err = damon_sysfs_context_set_targets(context); if (err) goto put_attrs_out; err = damon_sysfs_context_set_schemes(context); if (err) goto put_targets_attrs_out; return 0; put_targets_attrs_out: kobject_put(&context->targets->kobj); context->targets = NULL; put_attrs_out: kobject_put(&context->attrs->kobj); context->attrs = NULL; return err; } static void damon_sysfs_context_rm_dirs(struct damon_sysfs_context *context) { damon_sysfs_attrs_rm_dirs(context->attrs); kobject_put(&context->attrs->kobj); damon_sysfs_targets_rm_dirs(context->targets); kobject_put(&context->targets->kobj); damon_sysfs_schemes_rm_dirs(context->schemes); kobject_put(&context->schemes->kobj); } static ssize_t avail_operations_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { enum damon_ops_id id; int len = 0; for (id = 0; id < NR_DAMON_OPS; id++) { if (!damon_is_registered_ops(id)) continue; len += sysfs_emit_at(buf, len, "%s\n", damon_sysfs_ops_strs[id]); } return len; } static ssize_t operations_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_context *context = container_of(kobj, struct damon_sysfs_context, kobj); return sysfs_emit(buf, "%s\n", damon_sysfs_ops_strs[context->ops_id]); } static ssize_t operations_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_context *context = container_of(kobj, struct damon_sysfs_context, kobj); enum damon_ops_id id; for (id = 0; id < NR_DAMON_OPS; id++) { if (sysfs_streq(buf, damon_sysfs_ops_strs[id])) { context->ops_id = id; return count; } } return -EINVAL; } static void damon_sysfs_context_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_context, kobj)); } static struct kobj_attribute damon_sysfs_context_avail_operations_attr = __ATTR_RO_MODE(avail_operations, 0400); static struct kobj_attribute damon_sysfs_context_operations_attr = __ATTR_RW_MODE(operations, 0600); static struct attribute *damon_sysfs_context_attrs[] = { &damon_sysfs_context_avail_operations_attr.attr, &damon_sysfs_context_operations_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_context); static struct kobj_type damon_sysfs_context_ktype = { .release = damon_sysfs_context_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_context_groups, }; /* * contexts directory */ struct damon_sysfs_contexts { struct kobject kobj; struct damon_sysfs_context **contexts_arr; int nr; }; static struct damon_sysfs_contexts *damon_sysfs_contexts_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_contexts), GFP_KERNEL); } static void damon_sysfs_contexts_rm_dirs(struct damon_sysfs_contexts *contexts) { struct damon_sysfs_context **contexts_arr = contexts->contexts_arr; int i; for (i = 0; i < contexts->nr; i++) { damon_sysfs_context_rm_dirs(contexts_arr[i]); kobject_put(&contexts_arr[i]->kobj); } contexts->nr = 0; kfree(contexts_arr); contexts->contexts_arr = NULL; } static int damon_sysfs_contexts_add_dirs(struct damon_sysfs_contexts *contexts, int nr_contexts) { struct damon_sysfs_context **contexts_arr, *context; int err, i; damon_sysfs_contexts_rm_dirs(contexts); if (!nr_contexts) return 0; contexts_arr = kmalloc_array(nr_contexts, sizeof(*contexts_arr), GFP_KERNEL | __GFP_NOWARN); if (!contexts_arr) return -ENOMEM; contexts->contexts_arr = contexts_arr; for (i = 0; i < nr_contexts; i++) { context = damon_sysfs_context_alloc(DAMON_OPS_VADDR); if (!context) { damon_sysfs_contexts_rm_dirs(contexts); return -ENOMEM; } err = kobject_init_and_add(&context->kobj, &damon_sysfs_context_ktype, &contexts->kobj, "%d", i); if (err) goto out; err = damon_sysfs_context_add_dirs(context); if (err) goto out; contexts_arr[i] = context; contexts->nr++; } return 0; out: damon_sysfs_contexts_rm_dirs(contexts); kobject_put(&context->kobj); return err; } static ssize_t nr_contexts_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_contexts *contexts = container_of(kobj, struct damon_sysfs_contexts, kobj); return sysfs_emit(buf, "%d\n", contexts->nr); } static ssize_t nr_contexts_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_contexts *contexts = container_of(kobj, struct damon_sysfs_contexts, kobj); int nr, err; err = kstrtoint(buf, 0, &nr); if (err) return err; /* TODO: support multiple contexts per kdamond */ if (nr < 0 || 1 < nr) return -EINVAL; if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; err = damon_sysfs_contexts_add_dirs(contexts, nr); mutex_unlock(&damon_sysfs_lock); if (err) return err; return count; } static void damon_sysfs_contexts_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_contexts, kobj)); } static struct kobj_attribute damon_sysfs_contexts_nr_attr = __ATTR_RW_MODE(nr_contexts, 0600); static struct attribute *damon_sysfs_contexts_attrs[] = { &damon_sysfs_contexts_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_contexts); static struct kobj_type damon_sysfs_contexts_ktype = { .release = damon_sysfs_contexts_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_contexts_groups, }; /* * kdamond directory */ struct damon_sysfs_kdamond { struct kobject kobj; struct damon_sysfs_contexts *contexts; struct damon_ctx *damon_ctx; }; static struct damon_sysfs_kdamond *damon_sysfs_kdamond_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_kdamond), GFP_KERNEL); } static int damon_sysfs_kdamond_add_dirs(struct damon_sysfs_kdamond *kdamond) { struct damon_sysfs_contexts *contexts; int err; contexts = damon_sysfs_contexts_alloc(); if (!contexts) return -ENOMEM; err = kobject_init_and_add(&contexts->kobj, &damon_sysfs_contexts_ktype, &kdamond->kobj, "contexts"); if (err) { kobject_put(&contexts->kobj); return err; } kdamond->contexts = contexts; return err; } static void damon_sysfs_kdamond_rm_dirs(struct damon_sysfs_kdamond *kdamond) { damon_sysfs_contexts_rm_dirs(kdamond->contexts); kobject_put(&kdamond->contexts->kobj); } static bool damon_sysfs_ctx_running(struct damon_ctx *ctx) { bool running; mutex_lock(&ctx->kdamond_lock); running = ctx->kdamond != NULL; mutex_unlock(&ctx->kdamond_lock); return running; } /* * enum damon_sysfs_cmd - Commands for a specific kdamond. */ enum damon_sysfs_cmd { /* @DAMON_SYSFS_CMD_ON: Turn the kdamond on. */ DAMON_SYSFS_CMD_ON, /* @DAMON_SYSFS_CMD_OFF: Turn the kdamond off. */ DAMON_SYSFS_CMD_OFF, /* @DAMON_SYSFS_CMD_COMMIT: Update kdamond inputs. */ DAMON_SYSFS_CMD_COMMIT, /* * @DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS: Update scheme stats sysfs * files. */ DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS, /* * @NR_DAMON_SYSFS_CMDS: Total number of DAMON sysfs commands. */ NR_DAMON_SYSFS_CMDS, }; /* Should match with enum damon_sysfs_cmd */ static const char * const damon_sysfs_cmd_strs[] = { "on", "off", "commit", "update_schemes_stats", }; /* * struct damon_sysfs_cmd_request - A request to the DAMON callback. * @cmd: The command that needs to be handled by the callback. * @kdamond: The kobject wrapper that associated to the kdamond thread. * * This structure represents a sysfs command request that need to access some * DAMON context-internal data. Because DAMON context-internal data can be * safely accessed from DAMON callbacks without additional synchronization, the * request will be handled by the DAMON callback. None-``NULL`` @kdamond means * the request is valid. */ struct damon_sysfs_cmd_request { enum damon_sysfs_cmd cmd; struct damon_sysfs_kdamond *kdamond; }; /* Current DAMON callback request. Protected by damon_sysfs_lock. */ static struct damon_sysfs_cmd_request damon_sysfs_cmd_request; static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_kdamond *kdamond = container_of(kobj, struct damon_sysfs_kdamond, kobj); struct damon_ctx *ctx = kdamond->damon_ctx; bool running; if (!ctx) running = false; else running = damon_sysfs_ctx_running(ctx); return sysfs_emit(buf, "%s\n", running ? damon_sysfs_cmd_strs[DAMON_SYSFS_CMD_ON] : damon_sysfs_cmd_strs[DAMON_SYSFS_CMD_OFF]); } static int damon_sysfs_set_attrs(struct damon_ctx *ctx, struct damon_sysfs_attrs *sys_attrs) { struct damon_sysfs_intervals *sys_intervals = sys_attrs->intervals; struct damon_sysfs_ul_range *sys_nr_regions = sys_attrs->nr_regions_range; return damon_set_attrs(ctx, sys_intervals->sample_us, sys_intervals->aggr_us, sys_intervals->update_us, sys_nr_regions->min, sys_nr_regions->max); } static void damon_sysfs_destroy_targets(struct damon_ctx *ctx) { struct damon_target *t, *next; damon_for_each_target_safe(t, next, ctx) { if (damon_target_has_pid(ctx)) put_pid(t->pid); damon_destroy_target(t); } } static int damon_sysfs_set_regions(struct damon_target *t, struct damon_sysfs_regions *sysfs_regions) { struct damon_addr_range *ranges = kmalloc_array(sysfs_regions->nr, sizeof(*ranges), GFP_KERNEL | __GFP_NOWARN); int i, err = -EINVAL; if (!ranges) return -ENOMEM; for (i = 0; i < sysfs_regions->nr; i++) { struct damon_sysfs_region *sys_region = sysfs_regions->regions_arr[i]; if (sys_region->start > sys_region->end) goto out; ranges[i].start = sys_region->start; ranges[i].end = sys_region->end; if (i == 0) continue; if (ranges[i - 1].end > ranges[i].start) goto out; } err = damon_set_regions(t, ranges, sysfs_regions->nr); out: kfree(ranges); return err; } static int damon_sysfs_add_target(struct damon_sysfs_target *sys_target, struct damon_ctx *ctx) { struct damon_target *t = damon_new_target(); int err = -EINVAL; if (!t) return -ENOMEM; if (damon_target_has_pid(ctx)) { t->pid = find_get_pid(sys_target->pid); if (!t->pid) goto destroy_targets_out; } damon_add_target(ctx, t); err = damon_sysfs_set_regions(t, sys_target->regions); if (err) goto destroy_targets_out; return 0; destroy_targets_out: damon_sysfs_destroy_targets(ctx); return err; } /* * Search a target in a context that corresponds to the sysfs target input. * * Return: pointer to the target if found, NULL if not found, or negative * error code if the search failed. */ static struct damon_target *damon_sysfs_existing_target( struct damon_sysfs_target *sys_target, struct damon_ctx *ctx) { struct pid *pid; struct damon_target *t; if (!damon_target_has_pid(ctx)) { /* Up to only one target for paddr could exist */ damon_for_each_target(t, ctx) return t; return NULL; } /* ops.id should be DAMON_OPS_VADDR or DAMON_OPS_FVADDR */ pid = find_get_pid(sys_target->pid); if (!pid) return ERR_PTR(-EINVAL); damon_for_each_target(t, ctx) { if (t->pid == pid) { put_pid(pid); return t; } } put_pid(pid); return NULL; } static int damon_sysfs_set_targets(struct damon_ctx *ctx, struct damon_sysfs_targets *sysfs_targets) { int i, err; /* Multiple physical address space monitoring targets makes no sense */ if (ctx->ops.id == DAMON_OPS_PADDR && sysfs_targets->nr > 1) return -EINVAL; for (i = 0; i < sysfs_targets->nr; i++) { struct damon_sysfs_target *st = sysfs_targets->targets_arr[i]; struct damon_target *t = damon_sysfs_existing_target(st, ctx); if (IS_ERR(t)) return PTR_ERR(t); if (!t) err = damon_sysfs_add_target(st, ctx); else err = damon_sysfs_set_regions(t, st->regions); if (err) return err; } return 0; } static struct damos *damon_sysfs_mk_scheme( struct damon_sysfs_scheme *sysfs_scheme) { struct damon_sysfs_access_pattern *pattern = sysfs_scheme->access_pattern; struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas; struct damon_sysfs_weights *sysfs_weights = sysfs_quotas->weights; struct damon_sysfs_watermarks *sysfs_wmarks = sysfs_scheme->watermarks; struct damos_quota quota = { .ms = sysfs_quotas->ms, .sz = sysfs_quotas->sz, .reset_interval = sysfs_quotas->reset_interval_ms, .weight_sz = sysfs_weights->sz, .weight_nr_accesses = sysfs_weights->nr_accesses, .weight_age = sysfs_weights->age, }; struct damos_watermarks wmarks = { .metric = sysfs_wmarks->metric, .interval = sysfs_wmarks->interval_us, .high = sysfs_wmarks->high, .mid = sysfs_wmarks->mid, .low = sysfs_wmarks->low, }; return damon_new_scheme(pattern->sz->min, pattern->sz->max, pattern->nr_accesses->min, pattern->nr_accesses->max, pattern->age->min, pattern->age->max, sysfs_scheme->action, "a, &wmarks); } static int damon_sysfs_set_schemes(struct damon_ctx *ctx, struct damon_sysfs_schemes *sysfs_schemes) { int i; for (i = 0; i < sysfs_schemes->nr; i++) { struct damos *scheme, *next; scheme = damon_sysfs_mk_scheme(sysfs_schemes->schemes_arr[i]); if (!scheme) { damon_for_each_scheme_safe(scheme, next, ctx) damon_destroy_scheme(scheme); return -ENOMEM; } damon_add_scheme(ctx, scheme); } return 0; } static void damon_sysfs_before_terminate(struct damon_ctx *ctx) { struct damon_target *t, *next; if (!damon_target_has_pid(ctx)) return; mutex_lock(&ctx->kdamond_lock); damon_for_each_target_safe(t, next, ctx) { put_pid(t->pid); damon_destroy_target(t); } mutex_unlock(&ctx->kdamond_lock); } /* * damon_sysfs_upd_schemes_stats() - Update schemes stats sysfs files. * @kdamond: The kobject wrapper that associated to the kdamond thread. * * This function reads the schemes stats of specific kdamond and update the * related values for sysfs files. This function should be called from DAMON * callbacks while holding ``damon_syfs_lock``, to safely access the DAMON * contexts-internal data and DAMON sysfs variables. */ static int damon_sysfs_upd_schemes_stats(struct damon_sysfs_kdamond *kdamond) { struct damon_ctx *ctx = kdamond->damon_ctx; struct damon_sysfs_schemes *sysfs_schemes; struct damos *scheme; int schemes_idx = 0; if (!ctx) return -EINVAL; sysfs_schemes = kdamond->contexts->contexts_arr[0]->schemes; damon_for_each_scheme(scheme, ctx) { struct damon_sysfs_stats *sysfs_stats; sysfs_stats = sysfs_schemes->schemes_arr[schemes_idx++]->stats; sysfs_stats->nr_tried = scheme->stat.nr_tried; sysfs_stats->sz_tried = scheme->stat.sz_tried; sysfs_stats->nr_applied = scheme->stat.nr_applied; sysfs_stats->sz_applied = scheme->stat.sz_applied; sysfs_stats->qt_exceeds = scheme->stat.qt_exceeds; } return 0; } static inline bool damon_sysfs_kdamond_running( struct damon_sysfs_kdamond *kdamond) { return kdamond->damon_ctx && damon_sysfs_ctx_running(kdamond->damon_ctx); } static int damon_sysfs_apply_inputs(struct damon_ctx *ctx, struct damon_sysfs_context *sys_ctx) { int err; err = damon_select_ops(ctx, sys_ctx->ops_id); if (err) return err; err = damon_sysfs_set_attrs(ctx, sys_ctx->attrs); if (err) return err; err = damon_sysfs_set_targets(ctx, sys_ctx->targets); if (err) return err; return damon_sysfs_set_schemes(ctx, sys_ctx->schemes); } /* * damon_sysfs_commit_input() - Commit user inputs to a running kdamond. * @kdamond: The kobject wrapper for the associated kdamond. * * If the sysfs input is wrong, the kdamond will be terminated. */ static int damon_sysfs_commit_input(struct damon_sysfs_kdamond *kdamond) { if (!damon_sysfs_kdamond_running(kdamond)) return -EINVAL; /* TODO: Support multiple contexts per kdamond */ if (kdamond->contexts->nr != 1) return -EINVAL; return damon_sysfs_apply_inputs(kdamond->damon_ctx, kdamond->contexts->contexts_arr[0]); } /* * damon_sysfs_cmd_request_callback() - DAMON callback for handling requests. * @c: The DAMON context of the callback. * * This function is periodically called back from the kdamond thread for @c. * Then, it checks if there is a waiting DAMON sysfs request and handles it. */ static int damon_sysfs_cmd_request_callback(struct damon_ctx *c) { struct damon_sysfs_kdamond *kdamond; int err = 0; /* avoid deadlock due to concurrent state_store('off') */ if (!mutex_trylock(&damon_sysfs_lock)) return 0; kdamond = damon_sysfs_cmd_request.kdamond; if (!kdamond || kdamond->damon_ctx != c) goto out; switch (damon_sysfs_cmd_request.cmd) { case DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS: err = damon_sysfs_upd_schemes_stats(kdamond); break; case DAMON_SYSFS_CMD_COMMIT: err = damon_sysfs_commit_input(kdamond); break; default: break; } /* Mark the request as invalid now. */ damon_sysfs_cmd_request.kdamond = NULL; out: mutex_unlock(&damon_sysfs_lock); return err; } static struct damon_ctx *damon_sysfs_build_ctx( struct damon_sysfs_context *sys_ctx) { struct damon_ctx *ctx = damon_new_ctx(); int err; if (!ctx) return ERR_PTR(-ENOMEM); err = damon_sysfs_apply_inputs(ctx, sys_ctx); if (err) { damon_destroy_ctx(ctx); return ERR_PTR(err); } ctx->callback.after_wmarks_check = damon_sysfs_cmd_request_callback; ctx->callback.after_aggregation = damon_sysfs_cmd_request_callback; ctx->callback.before_terminate = damon_sysfs_before_terminate; return ctx; } static int damon_sysfs_turn_damon_on(struct damon_sysfs_kdamond *kdamond) { struct damon_ctx *ctx; int err; if (kdamond->damon_ctx && damon_sysfs_ctx_running(kdamond->damon_ctx)) return -EBUSY; if (damon_sysfs_cmd_request.kdamond == kdamond) return -EBUSY; /* TODO: support multiple contexts per kdamond */ if (kdamond->contexts->nr != 1) return -EINVAL; if (kdamond->damon_ctx) damon_destroy_ctx(kdamond->damon_ctx); kdamond->damon_ctx = NULL; ctx = damon_sysfs_build_ctx(kdamond->contexts->contexts_arr[0]); if (IS_ERR(ctx)) return PTR_ERR(ctx); err = damon_start(&ctx, 1, false); if (err) { damon_destroy_ctx(ctx); return err; } kdamond->damon_ctx = ctx; return err; } static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond *kdamond) { if (!kdamond->damon_ctx) return -EINVAL; return damon_stop(&kdamond->damon_ctx, 1); /* * To allow users show final monitoring results of already turned-off * DAMON, we free kdamond->damon_ctx in next * damon_sysfs_turn_damon_on(), or kdamonds_nr_store() */ } /* * damon_sysfs_handle_cmd() - Handle a command for a specific kdamond. * @cmd: The command to handle. * @kdamond: The kobject wrapper for the associated kdamond. * * This function handles a DAMON sysfs command for a kdamond. For commands * that need to access running DAMON context-internal data, it requests * handling of the command to the DAMON callback * (@damon_sysfs_cmd_request_callback()) and wait until it is properly handled, * or the context is completed. * * Return: 0 on success, negative error code otherwise. */ static int damon_sysfs_handle_cmd(enum damon_sysfs_cmd cmd, struct damon_sysfs_kdamond *kdamond) { bool need_wait = true; /* Handle commands that doesn't access DAMON context-internal data */ switch (cmd) { case DAMON_SYSFS_CMD_ON: return damon_sysfs_turn_damon_on(kdamond); case DAMON_SYSFS_CMD_OFF: return damon_sysfs_turn_damon_off(kdamond); default: break; } /* Pass the command to DAMON callback for safe DAMON context access */ if (damon_sysfs_cmd_request.kdamond) return -EBUSY; if (!damon_sysfs_kdamond_running(kdamond)) return -EINVAL; damon_sysfs_cmd_request.cmd = cmd; damon_sysfs_cmd_request.kdamond = kdamond; /* * wait until damon_sysfs_cmd_request_callback() handles the request * from kdamond context */ mutex_unlock(&damon_sysfs_lock); while (need_wait) { schedule_timeout_idle(msecs_to_jiffies(100)); if (!mutex_trylock(&damon_sysfs_lock)) continue; if (!damon_sysfs_cmd_request.kdamond) { /* damon_sysfs_cmd_request_callback() handled */ need_wait = false; } else if (!damon_sysfs_kdamond_running(kdamond)) { /* kdamond has already finished */ need_wait = false; damon_sysfs_cmd_request.kdamond = NULL; } mutex_unlock(&damon_sysfs_lock); } mutex_lock(&damon_sysfs_lock); return 0; } static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_kdamond *kdamond = container_of(kobj, struct damon_sysfs_kdamond, kobj); enum damon_sysfs_cmd cmd; ssize_t ret = -EINVAL; if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; for (cmd = 0; cmd < NR_DAMON_SYSFS_CMDS; cmd++) { if (sysfs_streq(buf, damon_sysfs_cmd_strs[cmd])) { ret = damon_sysfs_handle_cmd(cmd, kdamond); break; } } mutex_unlock(&damon_sysfs_lock); if (!ret) ret = count; return ret; } static ssize_t pid_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_kdamond *kdamond = container_of(kobj, struct damon_sysfs_kdamond, kobj); struct damon_ctx *ctx; int pid; if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; ctx = kdamond->damon_ctx; if (!ctx) { pid = -1; goto out; } mutex_lock(&ctx->kdamond_lock); if (!ctx->kdamond) pid = -1; else pid = ctx->kdamond->pid; mutex_unlock(&ctx->kdamond_lock); out: mutex_unlock(&damon_sysfs_lock); return sysfs_emit(buf, "%d\n", pid); } static void damon_sysfs_kdamond_release(struct kobject *kobj) { struct damon_sysfs_kdamond *kdamond = container_of(kobj, struct damon_sysfs_kdamond, kobj); if (kdamond->damon_ctx) damon_destroy_ctx(kdamond->damon_ctx); kfree(kdamond); } static struct kobj_attribute damon_sysfs_kdamond_state_attr = __ATTR_RW_MODE(state, 0600); static struct kobj_attribute damon_sysfs_kdamond_pid_attr = __ATTR_RO_MODE(pid, 0400); static struct attribute *damon_sysfs_kdamond_attrs[] = { &damon_sysfs_kdamond_state_attr.attr, &damon_sysfs_kdamond_pid_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_kdamond); static struct kobj_type damon_sysfs_kdamond_ktype = { .release = damon_sysfs_kdamond_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_kdamond_groups, }; /* * kdamonds directory */ struct damon_sysfs_kdamonds { struct kobject kobj; struct damon_sysfs_kdamond **kdamonds_arr; int nr; }; static struct damon_sysfs_kdamonds *damon_sysfs_kdamonds_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_kdamonds), GFP_KERNEL); } static void damon_sysfs_kdamonds_rm_dirs(struct damon_sysfs_kdamonds *kdamonds) { struct damon_sysfs_kdamond **kdamonds_arr = kdamonds->kdamonds_arr; int i; for (i = 0; i < kdamonds->nr; i++) { damon_sysfs_kdamond_rm_dirs(kdamonds_arr[i]); kobject_put(&kdamonds_arr[i]->kobj); } kdamonds->nr = 0; kfree(kdamonds_arr); kdamonds->kdamonds_arr = NULL; } static bool damon_sysfs_kdamonds_busy(struct damon_sysfs_kdamond **kdamonds, int nr_kdamonds) { int i; for (i = 0; i < nr_kdamonds; i++) { if (damon_sysfs_kdamond_running(kdamonds[i]) || damon_sysfs_cmd_request.kdamond == kdamonds[i]) return true; } return false; } static int damon_sysfs_kdamonds_add_dirs(struct damon_sysfs_kdamonds *kdamonds, int nr_kdamonds) { struct damon_sysfs_kdamond **kdamonds_arr, *kdamond; int err, i; if (damon_sysfs_kdamonds_busy(kdamonds->kdamonds_arr, kdamonds->nr)) return -EBUSY; damon_sysfs_kdamonds_rm_dirs(kdamonds); if (!nr_kdamonds) return 0; kdamonds_arr = kmalloc_array(nr_kdamonds, sizeof(*kdamonds_arr), GFP_KERNEL | __GFP_NOWARN); if (!kdamonds_arr) return -ENOMEM; kdamonds->kdamonds_arr = kdamonds_arr; for (i = 0; i < nr_kdamonds; i++) { kdamond = damon_sysfs_kdamond_alloc(); if (!kdamond) { damon_sysfs_kdamonds_rm_dirs(kdamonds); return -ENOMEM; } err = kobject_init_and_add(&kdamond->kobj, &damon_sysfs_kdamond_ktype, &kdamonds->kobj, "%d", i); if (err) goto out; err = damon_sysfs_kdamond_add_dirs(kdamond); if (err) goto out; kdamonds_arr[i] = kdamond; kdamonds->nr++; } return 0; out: damon_sysfs_kdamonds_rm_dirs(kdamonds); kobject_put(&kdamond->kobj); return err; } static ssize_t nr_kdamonds_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_kdamonds *kdamonds = container_of(kobj, struct damon_sysfs_kdamonds, kobj); return sysfs_emit(buf, "%d\n", kdamonds->nr); } static ssize_t nr_kdamonds_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_kdamonds *kdamonds = container_of(kobj, struct damon_sysfs_kdamonds, kobj); int nr, err; err = kstrtoint(buf, 0, &nr); if (err) return err; if (nr < 0) return -EINVAL; if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; err = damon_sysfs_kdamonds_add_dirs(kdamonds, nr); mutex_unlock(&damon_sysfs_lock); if (err) return err; return count; } static void damon_sysfs_kdamonds_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_kdamonds, kobj)); } static struct kobj_attribute damon_sysfs_kdamonds_nr_attr = __ATTR_RW_MODE(nr_kdamonds, 0600); static struct attribute *damon_sysfs_kdamonds_attrs[] = { &damon_sysfs_kdamonds_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_kdamonds); static struct kobj_type damon_sysfs_kdamonds_ktype = { .release = damon_sysfs_kdamonds_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_kdamonds_groups, }; /* * damon user interface directory */ struct damon_sysfs_ui_dir { struct kobject kobj; struct damon_sysfs_kdamonds *kdamonds; }; static struct damon_sysfs_ui_dir *damon_sysfs_ui_dir_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_ui_dir), GFP_KERNEL); } static int damon_sysfs_ui_dir_add_dirs(struct damon_sysfs_ui_dir *ui_dir) { struct damon_sysfs_kdamonds *kdamonds; int err; kdamonds = damon_sysfs_kdamonds_alloc(); if (!kdamonds) return -ENOMEM; err = kobject_init_and_add(&kdamonds->kobj, &damon_sysfs_kdamonds_ktype, &ui_dir->kobj, "kdamonds"); if (err) { kobject_put(&kdamonds->kobj); return err; } ui_dir->kdamonds = kdamonds; return err; } static void damon_sysfs_ui_dir_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_ui_dir, kobj)); } static struct attribute *damon_sysfs_ui_dir_attrs[] = { NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_ui_dir); static struct kobj_type damon_sysfs_ui_dir_ktype = { .release = damon_sysfs_ui_dir_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_ui_dir_groups, }; static int __init damon_sysfs_init(void) { struct kobject *damon_sysfs_root; struct damon_sysfs_ui_dir *admin; int err; damon_sysfs_root = kobject_create_and_add("damon", mm_kobj); if (!damon_sysfs_root) return -ENOMEM; admin = damon_sysfs_ui_dir_alloc(); if (!admin) { kobject_put(damon_sysfs_root); return -ENOMEM; } err = kobject_init_and_add(&admin->kobj, &damon_sysfs_ui_dir_ktype, damon_sysfs_root, "admin"); if (err) goto out; err = damon_sysfs_ui_dir_add_dirs(admin); if (err) goto out; return 0; out: kobject_put(&admin->kobj); kobject_put(damon_sysfs_root); return err; } subsys_initcall(damon_sysfs_init);