14bc05954SSeongJae Park // SPDX-License-Identifier: GPL-2.0 24bc05954SSeongJae Park /* 34bc05954SSeongJae Park * DAMON Debugfs Interface 44bc05954SSeongJae Park * 54bc05954SSeongJae Park * Author: SeongJae Park <sjpark@amazon.de> 64bc05954SSeongJae Park */ 74bc05954SSeongJae Park 84bc05954SSeongJae Park #define pr_fmt(fmt) "damon-dbgfs: " fmt 94bc05954SSeongJae Park 104bc05954SSeongJae Park #include <linux/damon.h> 114bc05954SSeongJae Park #include <linux/debugfs.h> 124bc05954SSeongJae Park #include <linux/file.h> 134bc05954SSeongJae Park #include <linux/mm.h> 144bc05954SSeongJae Park #include <linux/module.h> 154bc05954SSeongJae Park #include <linux/page_idle.h> 164bc05954SSeongJae Park #include <linux/slab.h> 174bc05954SSeongJae Park 184bc05954SSeongJae Park static struct damon_ctx **dbgfs_ctxs; 194bc05954SSeongJae Park static int dbgfs_nr_ctxs; 204bc05954SSeongJae Park static struct dentry **dbgfs_dirs; 2175c1c2b5SSeongJae Park static DEFINE_MUTEX(damon_dbgfs_lock); 224bc05954SSeongJae Park 234bc05954SSeongJae Park /* 244bc05954SSeongJae Park * Returns non-empty string on success, negative error code otherwise. 254bc05954SSeongJae Park */ 264bc05954SSeongJae Park static char *user_input_str(const char __user *buf, size_t count, loff_t *ppos) 274bc05954SSeongJae Park { 284bc05954SSeongJae Park char *kbuf; 294bc05954SSeongJae Park ssize_t ret; 304bc05954SSeongJae Park 314bc05954SSeongJae Park /* We do not accept continuous write */ 324bc05954SSeongJae Park if (*ppos) 334bc05954SSeongJae Park return ERR_PTR(-EINVAL); 344bc05954SSeongJae Park 354bc05954SSeongJae Park kbuf = kmalloc(count + 1, GFP_KERNEL); 364bc05954SSeongJae Park if (!kbuf) 374bc05954SSeongJae Park return ERR_PTR(-ENOMEM); 384bc05954SSeongJae Park 394bc05954SSeongJae Park ret = simple_write_to_buffer(kbuf, count + 1, ppos, buf, count); 404bc05954SSeongJae Park if (ret != count) { 414bc05954SSeongJae Park kfree(kbuf); 424bc05954SSeongJae Park return ERR_PTR(-EIO); 434bc05954SSeongJae Park } 444bc05954SSeongJae Park kbuf[ret] = '\0'; 454bc05954SSeongJae Park 464bc05954SSeongJae Park return kbuf; 474bc05954SSeongJae Park } 484bc05954SSeongJae Park 494bc05954SSeongJae Park static ssize_t dbgfs_attrs_read(struct file *file, 504bc05954SSeongJae Park char __user *buf, size_t count, loff_t *ppos) 514bc05954SSeongJae Park { 524bc05954SSeongJae Park struct damon_ctx *ctx = file->private_data; 534bc05954SSeongJae Park char kbuf[128]; 544bc05954SSeongJae Park int ret; 554bc05954SSeongJae Park 564bc05954SSeongJae Park mutex_lock(&ctx->kdamond_lock); 574bc05954SSeongJae Park ret = scnprintf(kbuf, ARRAY_SIZE(kbuf), "%lu %lu %lu %lu %lu\n", 584bc05954SSeongJae Park ctx->sample_interval, ctx->aggr_interval, 594bc05954SSeongJae Park ctx->primitive_update_interval, ctx->min_nr_regions, 604bc05954SSeongJae Park ctx->max_nr_regions); 614bc05954SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 624bc05954SSeongJae Park 634bc05954SSeongJae Park return simple_read_from_buffer(buf, count, ppos, kbuf, ret); 644bc05954SSeongJae Park } 654bc05954SSeongJae Park 664bc05954SSeongJae Park static ssize_t dbgfs_attrs_write(struct file *file, 674bc05954SSeongJae Park const char __user *buf, size_t count, loff_t *ppos) 684bc05954SSeongJae Park { 694bc05954SSeongJae Park struct damon_ctx *ctx = file->private_data; 704bc05954SSeongJae Park unsigned long s, a, r, minr, maxr; 714bc05954SSeongJae Park char *kbuf; 729210622aSRongwei Wang ssize_t ret; 734bc05954SSeongJae Park 744bc05954SSeongJae Park kbuf = user_input_str(buf, count, ppos); 754bc05954SSeongJae Park if (IS_ERR(kbuf)) 764bc05954SSeongJae Park return PTR_ERR(kbuf); 774bc05954SSeongJae Park 784bc05954SSeongJae Park if (sscanf(kbuf, "%lu %lu %lu %lu %lu", 794bc05954SSeongJae Park &s, &a, &r, &minr, &maxr) != 5) { 804bc05954SSeongJae Park ret = -EINVAL; 814bc05954SSeongJae Park goto out; 824bc05954SSeongJae Park } 834bc05954SSeongJae Park 844bc05954SSeongJae Park mutex_lock(&ctx->kdamond_lock); 854bc05954SSeongJae Park if (ctx->kdamond) { 864bc05954SSeongJae Park ret = -EBUSY; 874bc05954SSeongJae Park goto unlock_out; 884bc05954SSeongJae Park } 894bc05954SSeongJae Park 909210622aSRongwei Wang ret = damon_set_attrs(ctx, s, a, r, minr, maxr); 919210622aSRongwei Wang if (!ret) 929210622aSRongwei Wang ret = count; 934bc05954SSeongJae Park unlock_out: 944bc05954SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 954bc05954SSeongJae Park out: 964bc05954SSeongJae Park kfree(kbuf); 974bc05954SSeongJae Park return ret; 984bc05954SSeongJae Park } 994bc05954SSeongJae Park 100af122dd8SSeongJae Park static ssize_t sprint_schemes(struct damon_ctx *c, char *buf, ssize_t len) 101af122dd8SSeongJae Park { 102af122dd8SSeongJae Park struct damos *s; 103af122dd8SSeongJae Park int written = 0; 104af122dd8SSeongJae Park int rc; 105af122dd8SSeongJae Park 106af122dd8SSeongJae Park damon_for_each_scheme(s, c) { 107af122dd8SSeongJae Park rc = scnprintf(&buf[written], len - written, 1082f0b548cSSeongJae Park "%lu %lu %u %u %u %u %d %lu %lu\n", 109af122dd8SSeongJae Park s->min_sz_region, s->max_sz_region, 110af122dd8SSeongJae Park s->min_nr_accesses, s->max_nr_accesses, 111af122dd8SSeongJae Park s->min_age_region, s->max_age_region, 1122f0b548cSSeongJae Park s->action, s->stat_count, s->stat_sz); 113af122dd8SSeongJae Park if (!rc) 114af122dd8SSeongJae Park return -ENOMEM; 115af122dd8SSeongJae Park 116af122dd8SSeongJae Park written += rc; 117af122dd8SSeongJae Park } 118af122dd8SSeongJae Park return written; 119af122dd8SSeongJae Park } 120af122dd8SSeongJae Park 121af122dd8SSeongJae Park static ssize_t dbgfs_schemes_read(struct file *file, char __user *buf, 122af122dd8SSeongJae Park size_t count, loff_t *ppos) 123af122dd8SSeongJae Park { 124af122dd8SSeongJae Park struct damon_ctx *ctx = file->private_data; 125af122dd8SSeongJae Park char *kbuf; 126af122dd8SSeongJae Park ssize_t len; 127af122dd8SSeongJae Park 128af122dd8SSeongJae Park kbuf = kmalloc(count, GFP_KERNEL); 129af122dd8SSeongJae Park if (!kbuf) 130af122dd8SSeongJae Park return -ENOMEM; 131af122dd8SSeongJae Park 132af122dd8SSeongJae Park mutex_lock(&ctx->kdamond_lock); 133af122dd8SSeongJae Park len = sprint_schemes(ctx, kbuf, count); 134af122dd8SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 135af122dd8SSeongJae Park if (len < 0) 136af122dd8SSeongJae Park goto out; 137af122dd8SSeongJae Park len = simple_read_from_buffer(buf, count, ppos, kbuf, len); 138af122dd8SSeongJae Park 139af122dd8SSeongJae Park out: 140af122dd8SSeongJae Park kfree(kbuf); 141af122dd8SSeongJae Park return len; 142af122dd8SSeongJae Park } 143af122dd8SSeongJae Park 144af122dd8SSeongJae Park static void free_schemes_arr(struct damos **schemes, ssize_t nr_schemes) 145af122dd8SSeongJae Park { 146af122dd8SSeongJae Park ssize_t i; 147af122dd8SSeongJae Park 148af122dd8SSeongJae Park for (i = 0; i < nr_schemes; i++) 149af122dd8SSeongJae Park kfree(schemes[i]); 150af122dd8SSeongJae Park kfree(schemes); 151af122dd8SSeongJae Park } 152af122dd8SSeongJae Park 153af122dd8SSeongJae Park static bool damos_action_valid(int action) 154af122dd8SSeongJae Park { 155af122dd8SSeongJae Park switch (action) { 156af122dd8SSeongJae Park case DAMOS_WILLNEED: 157af122dd8SSeongJae Park case DAMOS_COLD: 158af122dd8SSeongJae Park case DAMOS_PAGEOUT: 159af122dd8SSeongJae Park case DAMOS_HUGEPAGE: 160af122dd8SSeongJae Park case DAMOS_NOHUGEPAGE: 1612f0b548cSSeongJae Park case DAMOS_STAT: 162af122dd8SSeongJae Park return true; 163af122dd8SSeongJae Park default: 164af122dd8SSeongJae Park return false; 165af122dd8SSeongJae Park } 166af122dd8SSeongJae Park } 167af122dd8SSeongJae Park 168af122dd8SSeongJae Park /* 169af122dd8SSeongJae Park * Converts a string into an array of struct damos pointers 170af122dd8SSeongJae Park * 171af122dd8SSeongJae Park * Returns an array of struct damos pointers that converted if the conversion 172af122dd8SSeongJae Park * success, or NULL otherwise. 173af122dd8SSeongJae Park */ 174af122dd8SSeongJae Park static struct damos **str_to_schemes(const char *str, ssize_t len, 175af122dd8SSeongJae Park ssize_t *nr_schemes) 176af122dd8SSeongJae Park { 177af122dd8SSeongJae Park struct damos *scheme, **schemes; 178af122dd8SSeongJae Park const int max_nr_schemes = 256; 179af122dd8SSeongJae Park int pos = 0, parsed, ret; 180af122dd8SSeongJae Park unsigned long min_sz, max_sz; 181af122dd8SSeongJae Park unsigned int min_nr_a, max_nr_a, min_age, max_age; 182af122dd8SSeongJae Park unsigned int action; 183af122dd8SSeongJae Park 184af122dd8SSeongJae Park schemes = kmalloc_array(max_nr_schemes, sizeof(scheme), 185af122dd8SSeongJae Park GFP_KERNEL); 186af122dd8SSeongJae Park if (!schemes) 187af122dd8SSeongJae Park return NULL; 188af122dd8SSeongJae Park 189af122dd8SSeongJae Park *nr_schemes = 0; 190af122dd8SSeongJae Park while (pos < len && *nr_schemes < max_nr_schemes) { 191*2b8a248dSSeongJae Park struct damos_quota quota = {}; 192*2b8a248dSSeongJae Park 193af122dd8SSeongJae Park ret = sscanf(&str[pos], "%lu %lu %u %u %u %u %u%n", 194af122dd8SSeongJae Park &min_sz, &max_sz, &min_nr_a, &max_nr_a, 195af122dd8SSeongJae Park &min_age, &max_age, &action, &parsed); 196af122dd8SSeongJae Park if (ret != 7) 197af122dd8SSeongJae Park break; 198af122dd8SSeongJae Park if (!damos_action_valid(action)) { 199af122dd8SSeongJae Park pr_err("wrong action %d\n", action); 200af122dd8SSeongJae Park goto fail; 201af122dd8SSeongJae Park } 202af122dd8SSeongJae Park 203af122dd8SSeongJae Park pos += parsed; 204af122dd8SSeongJae Park scheme = damon_new_scheme(min_sz, max_sz, min_nr_a, max_nr_a, 205*2b8a248dSSeongJae Park min_age, max_age, action, "a); 206af122dd8SSeongJae Park if (!scheme) 207af122dd8SSeongJae Park goto fail; 208af122dd8SSeongJae Park 209af122dd8SSeongJae Park schemes[*nr_schemes] = scheme; 210af122dd8SSeongJae Park *nr_schemes += 1; 211af122dd8SSeongJae Park } 212af122dd8SSeongJae Park return schemes; 213af122dd8SSeongJae Park fail: 214af122dd8SSeongJae Park free_schemes_arr(schemes, *nr_schemes); 215af122dd8SSeongJae Park return NULL; 216af122dd8SSeongJae Park } 217af122dd8SSeongJae Park 218af122dd8SSeongJae Park static ssize_t dbgfs_schemes_write(struct file *file, const char __user *buf, 219af122dd8SSeongJae Park size_t count, loff_t *ppos) 220af122dd8SSeongJae Park { 221af122dd8SSeongJae Park struct damon_ctx *ctx = file->private_data; 222af122dd8SSeongJae Park char *kbuf; 223af122dd8SSeongJae Park struct damos **schemes; 2249210622aSRongwei Wang ssize_t nr_schemes = 0, ret; 225af122dd8SSeongJae Park 226af122dd8SSeongJae Park kbuf = user_input_str(buf, count, ppos); 227af122dd8SSeongJae Park if (IS_ERR(kbuf)) 228af122dd8SSeongJae Park return PTR_ERR(kbuf); 229af122dd8SSeongJae Park 2309210622aSRongwei Wang schemes = str_to_schemes(kbuf, count, &nr_schemes); 231af122dd8SSeongJae Park if (!schemes) { 232af122dd8SSeongJae Park ret = -EINVAL; 233af122dd8SSeongJae Park goto out; 234af122dd8SSeongJae Park } 235af122dd8SSeongJae Park 236af122dd8SSeongJae Park mutex_lock(&ctx->kdamond_lock); 237af122dd8SSeongJae Park if (ctx->kdamond) { 238af122dd8SSeongJae Park ret = -EBUSY; 239af122dd8SSeongJae Park goto unlock_out; 240af122dd8SSeongJae Park } 241af122dd8SSeongJae Park 2429210622aSRongwei Wang ret = damon_set_schemes(ctx, schemes, nr_schemes); 2439210622aSRongwei Wang if (!ret) { 2449210622aSRongwei Wang ret = count; 245af122dd8SSeongJae Park nr_schemes = 0; 2469210622aSRongwei Wang } 2479210622aSRongwei Wang 248af122dd8SSeongJae Park unlock_out: 249af122dd8SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 250af122dd8SSeongJae Park free_schemes_arr(schemes, nr_schemes); 251af122dd8SSeongJae Park out: 252af122dd8SSeongJae Park kfree(kbuf); 253af122dd8SSeongJae Park return ret; 254af122dd8SSeongJae Park } 255af122dd8SSeongJae Park 2564bc05954SSeongJae Park static inline bool targetid_is_pid(const struct damon_ctx *ctx) 2574bc05954SSeongJae Park { 2584bc05954SSeongJae Park return ctx->primitive.target_valid == damon_va_target_valid; 2594bc05954SSeongJae Park } 2604bc05954SSeongJae Park 2614bc05954SSeongJae Park static ssize_t sprint_target_ids(struct damon_ctx *ctx, char *buf, ssize_t len) 2624bc05954SSeongJae Park { 2634bc05954SSeongJae Park struct damon_target *t; 2644bc05954SSeongJae Park unsigned long id; 2654bc05954SSeongJae Park int written = 0; 2664bc05954SSeongJae Park int rc; 2674bc05954SSeongJae Park 2684bc05954SSeongJae Park damon_for_each_target(t, ctx) { 2694bc05954SSeongJae Park id = t->id; 2704bc05954SSeongJae Park if (targetid_is_pid(ctx)) 2714bc05954SSeongJae Park /* Show pid numbers to debugfs users */ 2724bc05954SSeongJae Park id = (unsigned long)pid_vnr((struct pid *)id); 2734bc05954SSeongJae Park 2744bc05954SSeongJae Park rc = scnprintf(&buf[written], len - written, "%lu ", id); 2754bc05954SSeongJae Park if (!rc) 2764bc05954SSeongJae Park return -ENOMEM; 2774bc05954SSeongJae Park written += rc; 2784bc05954SSeongJae Park } 2794bc05954SSeongJae Park if (written) 2804bc05954SSeongJae Park written -= 1; 2814bc05954SSeongJae Park written += scnprintf(&buf[written], len - written, "\n"); 2824bc05954SSeongJae Park return written; 2834bc05954SSeongJae Park } 2844bc05954SSeongJae Park 2854bc05954SSeongJae Park static ssize_t dbgfs_target_ids_read(struct file *file, 2864bc05954SSeongJae Park char __user *buf, size_t count, loff_t *ppos) 2874bc05954SSeongJae Park { 2884bc05954SSeongJae Park struct damon_ctx *ctx = file->private_data; 2894bc05954SSeongJae Park ssize_t len; 2904bc05954SSeongJae Park char ids_buf[320]; 2914bc05954SSeongJae Park 2924bc05954SSeongJae Park mutex_lock(&ctx->kdamond_lock); 2934bc05954SSeongJae Park len = sprint_target_ids(ctx, ids_buf, 320); 2944bc05954SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 2954bc05954SSeongJae Park if (len < 0) 2964bc05954SSeongJae Park return len; 2974bc05954SSeongJae Park 2984bc05954SSeongJae Park return simple_read_from_buffer(buf, count, ppos, ids_buf, len); 2994bc05954SSeongJae Park } 3004bc05954SSeongJae Park 3014bc05954SSeongJae Park /* 3024bc05954SSeongJae Park * Converts a string into an array of unsigned long integers 3034bc05954SSeongJae Park * 3044bc05954SSeongJae Park * Returns an array of unsigned long integers if the conversion success, or 3054bc05954SSeongJae Park * NULL otherwise. 3064bc05954SSeongJae Park */ 3074bc05954SSeongJae Park static unsigned long *str_to_target_ids(const char *str, ssize_t len, 3084bc05954SSeongJae Park ssize_t *nr_ids) 3094bc05954SSeongJae Park { 3104bc05954SSeongJae Park unsigned long *ids; 3114bc05954SSeongJae Park const int max_nr_ids = 32; 3124bc05954SSeongJae Park unsigned long id; 3134bc05954SSeongJae Park int pos = 0, parsed, ret; 3144bc05954SSeongJae Park 3154bc05954SSeongJae Park *nr_ids = 0; 3164bc05954SSeongJae Park ids = kmalloc_array(max_nr_ids, sizeof(id), GFP_KERNEL); 3174bc05954SSeongJae Park if (!ids) 3184bc05954SSeongJae Park return NULL; 3194bc05954SSeongJae Park while (*nr_ids < max_nr_ids && pos < len) { 3204bc05954SSeongJae Park ret = sscanf(&str[pos], "%lu%n", &id, &parsed); 3214bc05954SSeongJae Park pos += parsed; 3224bc05954SSeongJae Park if (ret != 1) 3234bc05954SSeongJae Park break; 3244bc05954SSeongJae Park ids[*nr_ids] = id; 3254bc05954SSeongJae Park *nr_ids += 1; 3264bc05954SSeongJae Park } 3274bc05954SSeongJae Park 3284bc05954SSeongJae Park return ids; 3294bc05954SSeongJae Park } 3304bc05954SSeongJae Park 3314bc05954SSeongJae Park static void dbgfs_put_pids(unsigned long *ids, int nr_ids) 3324bc05954SSeongJae Park { 3334bc05954SSeongJae Park int i; 3344bc05954SSeongJae Park 3354bc05954SSeongJae Park for (i = 0; i < nr_ids; i++) 3364bc05954SSeongJae Park put_pid((struct pid *)ids[i]); 3374bc05954SSeongJae Park } 3384bc05954SSeongJae Park 3394bc05954SSeongJae Park static ssize_t dbgfs_target_ids_write(struct file *file, 3404bc05954SSeongJae Park const char __user *buf, size_t count, loff_t *ppos) 3414bc05954SSeongJae Park { 3424bc05954SSeongJae Park struct damon_ctx *ctx = file->private_data; 343c026291aSSeongJae Park bool id_is_pid = true; 3444bc05954SSeongJae Park char *kbuf, *nrs; 3454bc05954SSeongJae Park unsigned long *targets; 3464bc05954SSeongJae Park ssize_t nr_targets; 3479210622aSRongwei Wang ssize_t ret; 3484bc05954SSeongJae Park int i; 3494bc05954SSeongJae Park 3504bc05954SSeongJae Park kbuf = user_input_str(buf, count, ppos); 3514bc05954SSeongJae Park if (IS_ERR(kbuf)) 3524bc05954SSeongJae Park return PTR_ERR(kbuf); 3534bc05954SSeongJae Park 3544bc05954SSeongJae Park nrs = kbuf; 355c026291aSSeongJae Park if (!strncmp(kbuf, "paddr\n", count)) { 356c026291aSSeongJae Park id_is_pid = false; 357c026291aSSeongJae Park /* target id is meaningless here, but we set it just for fun */ 358c026291aSSeongJae Park scnprintf(kbuf, count, "42 "); 359c026291aSSeongJae Park } 3604bc05954SSeongJae Park 3619210622aSRongwei Wang targets = str_to_target_ids(nrs, count, &nr_targets); 3624bc05954SSeongJae Park if (!targets) { 3634bc05954SSeongJae Park ret = -ENOMEM; 3644bc05954SSeongJae Park goto out; 3654bc05954SSeongJae Park } 3664bc05954SSeongJae Park 367c026291aSSeongJae Park if (id_is_pid) { 3684bc05954SSeongJae Park for (i = 0; i < nr_targets; i++) { 3694bc05954SSeongJae Park targets[i] = (unsigned long)find_get_pid( 3704bc05954SSeongJae Park (int)targets[i]); 3714bc05954SSeongJae Park if (!targets[i]) { 3724bc05954SSeongJae Park dbgfs_put_pids(targets, i); 3734bc05954SSeongJae Park ret = -EINVAL; 3744bc05954SSeongJae Park goto free_targets_out; 3754bc05954SSeongJae Park } 3764bc05954SSeongJae Park } 3774bc05954SSeongJae Park } 3784bc05954SSeongJae Park 3794bc05954SSeongJae Park mutex_lock(&ctx->kdamond_lock); 3804bc05954SSeongJae Park if (ctx->kdamond) { 381c026291aSSeongJae Park if (id_is_pid) 3824bc05954SSeongJae Park dbgfs_put_pids(targets, nr_targets); 3834bc05954SSeongJae Park ret = -EBUSY; 3844bc05954SSeongJae Park goto unlock_out; 3854bc05954SSeongJae Park } 3864bc05954SSeongJae Park 387c026291aSSeongJae Park /* remove targets with previously-set primitive */ 388c026291aSSeongJae Park damon_set_targets(ctx, NULL, 0); 389c026291aSSeongJae Park 390c026291aSSeongJae Park /* Configure the context for the address space type */ 391c026291aSSeongJae Park if (id_is_pid) 392c026291aSSeongJae Park damon_va_set_primitives(ctx); 393c026291aSSeongJae Park else 394c026291aSSeongJae Park damon_pa_set_primitives(ctx); 395c026291aSSeongJae Park 3969210622aSRongwei Wang ret = damon_set_targets(ctx, targets, nr_targets); 3979210622aSRongwei Wang if (ret) { 398c026291aSSeongJae Park if (id_is_pid) 3994bc05954SSeongJae Park dbgfs_put_pids(targets, nr_targets); 4009210622aSRongwei Wang } else { 4019210622aSRongwei Wang ret = count; 4024bc05954SSeongJae Park } 4034bc05954SSeongJae Park 4044bc05954SSeongJae Park unlock_out: 4054bc05954SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 4064bc05954SSeongJae Park free_targets_out: 4074bc05954SSeongJae Park kfree(targets); 4084bc05954SSeongJae Park out: 4094bc05954SSeongJae Park kfree(kbuf); 4104bc05954SSeongJae Park return ret; 4114bc05954SSeongJae Park } 4124bc05954SSeongJae Park 41390bebce9SSeongJae Park static ssize_t sprint_init_regions(struct damon_ctx *c, char *buf, ssize_t len) 41490bebce9SSeongJae Park { 41590bebce9SSeongJae Park struct damon_target *t; 41690bebce9SSeongJae Park struct damon_region *r; 41790bebce9SSeongJae Park int written = 0; 41890bebce9SSeongJae Park int rc; 41990bebce9SSeongJae Park 42090bebce9SSeongJae Park damon_for_each_target(t, c) { 42190bebce9SSeongJae Park damon_for_each_region(r, t) { 42290bebce9SSeongJae Park rc = scnprintf(&buf[written], len - written, 42390bebce9SSeongJae Park "%lu %lu %lu\n", 42490bebce9SSeongJae Park t->id, r->ar.start, r->ar.end); 42590bebce9SSeongJae Park if (!rc) 42690bebce9SSeongJae Park return -ENOMEM; 42790bebce9SSeongJae Park written += rc; 42890bebce9SSeongJae Park } 42990bebce9SSeongJae Park } 43090bebce9SSeongJae Park return written; 43190bebce9SSeongJae Park } 43290bebce9SSeongJae Park 43390bebce9SSeongJae Park static ssize_t dbgfs_init_regions_read(struct file *file, char __user *buf, 43490bebce9SSeongJae Park size_t count, loff_t *ppos) 43590bebce9SSeongJae Park { 43690bebce9SSeongJae Park struct damon_ctx *ctx = file->private_data; 43790bebce9SSeongJae Park char *kbuf; 43890bebce9SSeongJae Park ssize_t len; 43990bebce9SSeongJae Park 44090bebce9SSeongJae Park kbuf = kmalloc(count, GFP_KERNEL); 44190bebce9SSeongJae Park if (!kbuf) 44290bebce9SSeongJae Park return -ENOMEM; 44390bebce9SSeongJae Park 44490bebce9SSeongJae Park mutex_lock(&ctx->kdamond_lock); 44590bebce9SSeongJae Park if (ctx->kdamond) { 44690bebce9SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 44790bebce9SSeongJae Park len = -EBUSY; 44890bebce9SSeongJae Park goto out; 44990bebce9SSeongJae Park } 45090bebce9SSeongJae Park 45190bebce9SSeongJae Park len = sprint_init_regions(ctx, kbuf, count); 45290bebce9SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 45390bebce9SSeongJae Park if (len < 0) 45490bebce9SSeongJae Park goto out; 45590bebce9SSeongJae Park len = simple_read_from_buffer(buf, count, ppos, kbuf, len); 45690bebce9SSeongJae Park 45790bebce9SSeongJae Park out: 45890bebce9SSeongJae Park kfree(kbuf); 45990bebce9SSeongJae Park return len; 46090bebce9SSeongJae Park } 46190bebce9SSeongJae Park 46290bebce9SSeongJae Park static int add_init_region(struct damon_ctx *c, 46390bebce9SSeongJae Park unsigned long target_id, struct damon_addr_range *ar) 46490bebce9SSeongJae Park { 46590bebce9SSeongJae Park struct damon_target *t; 46690bebce9SSeongJae Park struct damon_region *r, *prev; 46790bebce9SSeongJae Park unsigned long id; 46890bebce9SSeongJae Park int rc = -EINVAL; 46990bebce9SSeongJae Park 47090bebce9SSeongJae Park if (ar->start >= ar->end) 47190bebce9SSeongJae Park return -EINVAL; 47290bebce9SSeongJae Park 47390bebce9SSeongJae Park damon_for_each_target(t, c) { 47490bebce9SSeongJae Park id = t->id; 47590bebce9SSeongJae Park if (targetid_is_pid(c)) 47690bebce9SSeongJae Park id = (unsigned long)pid_vnr((struct pid *)id); 47790bebce9SSeongJae Park if (id == target_id) { 47890bebce9SSeongJae Park r = damon_new_region(ar->start, ar->end); 47990bebce9SSeongJae Park if (!r) 48090bebce9SSeongJae Park return -ENOMEM; 48190bebce9SSeongJae Park damon_add_region(r, t); 48290bebce9SSeongJae Park if (damon_nr_regions(t) > 1) { 48390bebce9SSeongJae Park prev = damon_prev_region(r); 48490bebce9SSeongJae Park if (prev->ar.end > r->ar.start) { 48590bebce9SSeongJae Park damon_destroy_region(r, t); 48690bebce9SSeongJae Park return -EINVAL; 48790bebce9SSeongJae Park } 48890bebce9SSeongJae Park } 48990bebce9SSeongJae Park rc = 0; 49090bebce9SSeongJae Park } 49190bebce9SSeongJae Park } 49290bebce9SSeongJae Park return rc; 49390bebce9SSeongJae Park } 49490bebce9SSeongJae Park 49590bebce9SSeongJae Park static int set_init_regions(struct damon_ctx *c, const char *str, ssize_t len) 49690bebce9SSeongJae Park { 49790bebce9SSeongJae Park struct damon_target *t; 49890bebce9SSeongJae Park struct damon_region *r, *next; 49990bebce9SSeongJae Park int pos = 0, parsed, ret; 50090bebce9SSeongJae Park unsigned long target_id; 50190bebce9SSeongJae Park struct damon_addr_range ar; 50290bebce9SSeongJae Park int err; 50390bebce9SSeongJae Park 50490bebce9SSeongJae Park damon_for_each_target(t, c) { 50590bebce9SSeongJae Park damon_for_each_region_safe(r, next, t) 50690bebce9SSeongJae Park damon_destroy_region(r, t); 50790bebce9SSeongJae Park } 50890bebce9SSeongJae Park 50990bebce9SSeongJae Park while (pos < len) { 51090bebce9SSeongJae Park ret = sscanf(&str[pos], "%lu %lu %lu%n", 51190bebce9SSeongJae Park &target_id, &ar.start, &ar.end, &parsed); 51290bebce9SSeongJae Park if (ret != 3) 51390bebce9SSeongJae Park break; 51490bebce9SSeongJae Park err = add_init_region(c, target_id, &ar); 51590bebce9SSeongJae Park if (err) 51690bebce9SSeongJae Park goto fail; 51790bebce9SSeongJae Park pos += parsed; 51890bebce9SSeongJae Park } 51990bebce9SSeongJae Park 52090bebce9SSeongJae Park return 0; 52190bebce9SSeongJae Park 52290bebce9SSeongJae Park fail: 52390bebce9SSeongJae Park damon_for_each_target(t, c) { 52490bebce9SSeongJae Park damon_for_each_region_safe(r, next, t) 52590bebce9SSeongJae Park damon_destroy_region(r, t); 52690bebce9SSeongJae Park } 52790bebce9SSeongJae Park return err; 52890bebce9SSeongJae Park } 52990bebce9SSeongJae Park 53090bebce9SSeongJae Park static ssize_t dbgfs_init_regions_write(struct file *file, 53190bebce9SSeongJae Park const char __user *buf, size_t count, 53290bebce9SSeongJae Park loff_t *ppos) 53390bebce9SSeongJae Park { 53490bebce9SSeongJae Park struct damon_ctx *ctx = file->private_data; 53590bebce9SSeongJae Park char *kbuf; 53690bebce9SSeongJae Park ssize_t ret = count; 53790bebce9SSeongJae Park int err; 53890bebce9SSeongJae Park 53990bebce9SSeongJae Park kbuf = user_input_str(buf, count, ppos); 54090bebce9SSeongJae Park if (IS_ERR(kbuf)) 54190bebce9SSeongJae Park return PTR_ERR(kbuf); 54290bebce9SSeongJae Park 54390bebce9SSeongJae Park mutex_lock(&ctx->kdamond_lock); 54490bebce9SSeongJae Park if (ctx->kdamond) { 54590bebce9SSeongJae Park ret = -EBUSY; 54690bebce9SSeongJae Park goto unlock_out; 54790bebce9SSeongJae Park } 54890bebce9SSeongJae Park 54990bebce9SSeongJae Park err = set_init_regions(ctx, kbuf, ret); 55090bebce9SSeongJae Park if (err) 55190bebce9SSeongJae Park ret = err; 55290bebce9SSeongJae Park 55390bebce9SSeongJae Park unlock_out: 55490bebce9SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 55590bebce9SSeongJae Park kfree(kbuf); 55690bebce9SSeongJae Park return ret; 55790bebce9SSeongJae Park } 55890bebce9SSeongJae Park 559429538e8SSeongJae Park static ssize_t dbgfs_kdamond_pid_read(struct file *file, 560429538e8SSeongJae Park char __user *buf, size_t count, loff_t *ppos) 561429538e8SSeongJae Park { 562429538e8SSeongJae Park struct damon_ctx *ctx = file->private_data; 563429538e8SSeongJae Park char *kbuf; 564429538e8SSeongJae Park ssize_t len; 565429538e8SSeongJae Park 566429538e8SSeongJae Park kbuf = kmalloc(count, GFP_KERNEL); 567429538e8SSeongJae Park if (!kbuf) 568429538e8SSeongJae Park return -ENOMEM; 569429538e8SSeongJae Park 570429538e8SSeongJae Park mutex_lock(&ctx->kdamond_lock); 571429538e8SSeongJae Park if (ctx->kdamond) 572429538e8SSeongJae Park len = scnprintf(kbuf, count, "%d\n", ctx->kdamond->pid); 573429538e8SSeongJae Park else 574429538e8SSeongJae Park len = scnprintf(kbuf, count, "none\n"); 575429538e8SSeongJae Park mutex_unlock(&ctx->kdamond_lock); 576429538e8SSeongJae Park if (!len) 577429538e8SSeongJae Park goto out; 578429538e8SSeongJae Park len = simple_read_from_buffer(buf, count, ppos, kbuf, len); 579429538e8SSeongJae Park 580429538e8SSeongJae Park out: 581429538e8SSeongJae Park kfree(kbuf); 582429538e8SSeongJae Park return len; 583429538e8SSeongJae Park } 584429538e8SSeongJae Park 5854bc05954SSeongJae Park static int damon_dbgfs_open(struct inode *inode, struct file *file) 5864bc05954SSeongJae Park { 5874bc05954SSeongJae Park file->private_data = inode->i_private; 5884bc05954SSeongJae Park 5894bc05954SSeongJae Park return nonseekable_open(inode, file); 5904bc05954SSeongJae Park } 5914bc05954SSeongJae Park 5924bc05954SSeongJae Park static const struct file_operations attrs_fops = { 5934bc05954SSeongJae Park .open = damon_dbgfs_open, 5944bc05954SSeongJae Park .read = dbgfs_attrs_read, 5954bc05954SSeongJae Park .write = dbgfs_attrs_write, 5964bc05954SSeongJae Park }; 5974bc05954SSeongJae Park 598af122dd8SSeongJae Park static const struct file_operations schemes_fops = { 599af122dd8SSeongJae Park .open = damon_dbgfs_open, 600af122dd8SSeongJae Park .read = dbgfs_schemes_read, 601af122dd8SSeongJae Park .write = dbgfs_schemes_write, 602af122dd8SSeongJae Park }; 603af122dd8SSeongJae Park 6044bc05954SSeongJae Park static const struct file_operations target_ids_fops = { 6054bc05954SSeongJae Park .open = damon_dbgfs_open, 6064bc05954SSeongJae Park .read = dbgfs_target_ids_read, 6074bc05954SSeongJae Park .write = dbgfs_target_ids_write, 6084bc05954SSeongJae Park }; 6094bc05954SSeongJae Park 61090bebce9SSeongJae Park static const struct file_operations init_regions_fops = { 61190bebce9SSeongJae Park .open = damon_dbgfs_open, 61290bebce9SSeongJae Park .read = dbgfs_init_regions_read, 61390bebce9SSeongJae Park .write = dbgfs_init_regions_write, 61490bebce9SSeongJae Park }; 61590bebce9SSeongJae Park 616429538e8SSeongJae Park static const struct file_operations kdamond_pid_fops = { 617429538e8SSeongJae Park .open = damon_dbgfs_open, 618429538e8SSeongJae Park .read = dbgfs_kdamond_pid_read, 619429538e8SSeongJae Park }; 620429538e8SSeongJae Park 6214bc05954SSeongJae Park static void dbgfs_fill_ctx_dir(struct dentry *dir, struct damon_ctx *ctx) 6224bc05954SSeongJae Park { 623af122dd8SSeongJae Park const char * const file_names[] = {"attrs", "schemes", "target_ids", 62490bebce9SSeongJae Park "init_regions", "kdamond_pid"}; 625af122dd8SSeongJae Park const struct file_operations *fops[] = {&attrs_fops, &schemes_fops, 62690bebce9SSeongJae Park &target_ids_fops, &init_regions_fops, &kdamond_pid_fops}; 6274bc05954SSeongJae Park int i; 6284bc05954SSeongJae Park 6294bc05954SSeongJae Park for (i = 0; i < ARRAY_SIZE(file_names); i++) 6304bc05954SSeongJae Park debugfs_create_file(file_names[i], 0600, dir, ctx, fops[i]); 6314bc05954SSeongJae Park } 6324bc05954SSeongJae Park 6334bc05954SSeongJae Park static int dbgfs_before_terminate(struct damon_ctx *ctx) 6344bc05954SSeongJae Park { 6354bc05954SSeongJae Park struct damon_target *t, *next; 6364bc05954SSeongJae Park 6374bc05954SSeongJae Park if (!targetid_is_pid(ctx)) 6384bc05954SSeongJae Park return 0; 6394bc05954SSeongJae Park 6404bc05954SSeongJae Park damon_for_each_target_safe(t, next, ctx) { 6414bc05954SSeongJae Park put_pid((struct pid *)t->id); 6424bc05954SSeongJae Park damon_destroy_target(t); 6434bc05954SSeongJae Park } 6444bc05954SSeongJae Park return 0; 6454bc05954SSeongJae Park } 6464bc05954SSeongJae Park 6474bc05954SSeongJae Park static struct damon_ctx *dbgfs_new_ctx(void) 6484bc05954SSeongJae Park { 6494bc05954SSeongJae Park struct damon_ctx *ctx; 6504bc05954SSeongJae Park 6514bc05954SSeongJae Park ctx = damon_new_ctx(); 6524bc05954SSeongJae Park if (!ctx) 6534bc05954SSeongJae Park return NULL; 6544bc05954SSeongJae Park 6554bc05954SSeongJae Park damon_va_set_primitives(ctx); 6564bc05954SSeongJae Park ctx->callback.before_terminate = dbgfs_before_terminate; 6574bc05954SSeongJae Park return ctx; 6584bc05954SSeongJae Park } 6594bc05954SSeongJae Park 66075c1c2b5SSeongJae Park static void dbgfs_destroy_ctx(struct damon_ctx *ctx) 66175c1c2b5SSeongJae Park { 66275c1c2b5SSeongJae Park damon_destroy_ctx(ctx); 66375c1c2b5SSeongJae Park } 66475c1c2b5SSeongJae Park 66575c1c2b5SSeongJae Park /* 66675c1c2b5SSeongJae Park * Make a context of @name and create a debugfs directory for it. 66775c1c2b5SSeongJae Park * 66875c1c2b5SSeongJae Park * This function should be called while holding damon_dbgfs_lock. 66975c1c2b5SSeongJae Park * 67075c1c2b5SSeongJae Park * Returns 0 on success, negative error code otherwise. 67175c1c2b5SSeongJae Park */ 67275c1c2b5SSeongJae Park static int dbgfs_mk_context(char *name) 67375c1c2b5SSeongJae Park { 67475c1c2b5SSeongJae Park struct dentry *root, **new_dirs, *new_dir; 67575c1c2b5SSeongJae Park struct damon_ctx **new_ctxs, *new_ctx; 67675c1c2b5SSeongJae Park 67775c1c2b5SSeongJae Park if (damon_nr_running_ctxs()) 67875c1c2b5SSeongJae Park return -EBUSY; 67975c1c2b5SSeongJae Park 68075c1c2b5SSeongJae Park new_ctxs = krealloc(dbgfs_ctxs, sizeof(*dbgfs_ctxs) * 68175c1c2b5SSeongJae Park (dbgfs_nr_ctxs + 1), GFP_KERNEL); 68275c1c2b5SSeongJae Park if (!new_ctxs) 68375c1c2b5SSeongJae Park return -ENOMEM; 68475c1c2b5SSeongJae Park dbgfs_ctxs = new_ctxs; 68575c1c2b5SSeongJae Park 68675c1c2b5SSeongJae Park new_dirs = krealloc(dbgfs_dirs, sizeof(*dbgfs_dirs) * 68775c1c2b5SSeongJae Park (dbgfs_nr_ctxs + 1), GFP_KERNEL); 68875c1c2b5SSeongJae Park if (!new_dirs) 68975c1c2b5SSeongJae Park return -ENOMEM; 69075c1c2b5SSeongJae Park dbgfs_dirs = new_dirs; 69175c1c2b5SSeongJae Park 69275c1c2b5SSeongJae Park root = dbgfs_dirs[0]; 69375c1c2b5SSeongJae Park if (!root) 69475c1c2b5SSeongJae Park return -ENOENT; 69575c1c2b5SSeongJae Park 69675c1c2b5SSeongJae Park new_dir = debugfs_create_dir(name, root); 69775c1c2b5SSeongJae Park dbgfs_dirs[dbgfs_nr_ctxs] = new_dir; 69875c1c2b5SSeongJae Park 69975c1c2b5SSeongJae Park new_ctx = dbgfs_new_ctx(); 70075c1c2b5SSeongJae Park if (!new_ctx) { 70175c1c2b5SSeongJae Park debugfs_remove(new_dir); 70275c1c2b5SSeongJae Park dbgfs_dirs[dbgfs_nr_ctxs] = NULL; 70375c1c2b5SSeongJae Park return -ENOMEM; 70475c1c2b5SSeongJae Park } 70575c1c2b5SSeongJae Park 70675c1c2b5SSeongJae Park dbgfs_ctxs[dbgfs_nr_ctxs] = new_ctx; 70775c1c2b5SSeongJae Park dbgfs_fill_ctx_dir(dbgfs_dirs[dbgfs_nr_ctxs], 70875c1c2b5SSeongJae Park dbgfs_ctxs[dbgfs_nr_ctxs]); 70975c1c2b5SSeongJae Park dbgfs_nr_ctxs++; 71075c1c2b5SSeongJae Park 71175c1c2b5SSeongJae Park return 0; 71275c1c2b5SSeongJae Park } 71375c1c2b5SSeongJae Park 71475c1c2b5SSeongJae Park static ssize_t dbgfs_mk_context_write(struct file *file, 71575c1c2b5SSeongJae Park const char __user *buf, size_t count, loff_t *ppos) 71675c1c2b5SSeongJae Park { 71775c1c2b5SSeongJae Park char *kbuf; 71875c1c2b5SSeongJae Park char *ctx_name; 7199210622aSRongwei Wang ssize_t ret; 72075c1c2b5SSeongJae Park 72175c1c2b5SSeongJae Park kbuf = user_input_str(buf, count, ppos); 72275c1c2b5SSeongJae Park if (IS_ERR(kbuf)) 72375c1c2b5SSeongJae Park return PTR_ERR(kbuf); 72475c1c2b5SSeongJae Park ctx_name = kmalloc(count + 1, GFP_KERNEL); 72575c1c2b5SSeongJae Park if (!ctx_name) { 72675c1c2b5SSeongJae Park kfree(kbuf); 72775c1c2b5SSeongJae Park return -ENOMEM; 72875c1c2b5SSeongJae Park } 72975c1c2b5SSeongJae Park 73075c1c2b5SSeongJae Park /* Trim white space */ 73175c1c2b5SSeongJae Park if (sscanf(kbuf, "%s", ctx_name) != 1) { 73275c1c2b5SSeongJae Park ret = -EINVAL; 73375c1c2b5SSeongJae Park goto out; 73475c1c2b5SSeongJae Park } 73575c1c2b5SSeongJae Park 73675c1c2b5SSeongJae Park mutex_lock(&damon_dbgfs_lock); 7379210622aSRongwei Wang ret = dbgfs_mk_context(ctx_name); 7389210622aSRongwei Wang if (!ret) 7399210622aSRongwei Wang ret = count; 74075c1c2b5SSeongJae Park mutex_unlock(&damon_dbgfs_lock); 74175c1c2b5SSeongJae Park 74275c1c2b5SSeongJae Park out: 74375c1c2b5SSeongJae Park kfree(kbuf); 74475c1c2b5SSeongJae Park kfree(ctx_name); 74575c1c2b5SSeongJae Park return ret; 74675c1c2b5SSeongJae Park } 74775c1c2b5SSeongJae Park 74875c1c2b5SSeongJae Park /* 74975c1c2b5SSeongJae Park * Remove a context of @name and its debugfs directory. 75075c1c2b5SSeongJae Park * 75175c1c2b5SSeongJae Park * This function should be called while holding damon_dbgfs_lock. 75275c1c2b5SSeongJae Park * 75375c1c2b5SSeongJae Park * Return 0 on success, negative error code otherwise. 75475c1c2b5SSeongJae Park */ 75575c1c2b5SSeongJae Park static int dbgfs_rm_context(char *name) 75675c1c2b5SSeongJae Park { 75775c1c2b5SSeongJae Park struct dentry *root, *dir, **new_dirs; 75875c1c2b5SSeongJae Park struct damon_ctx **new_ctxs; 75975c1c2b5SSeongJae Park int i, j; 76075c1c2b5SSeongJae Park 76175c1c2b5SSeongJae Park if (damon_nr_running_ctxs()) 76275c1c2b5SSeongJae Park return -EBUSY; 76375c1c2b5SSeongJae Park 76475c1c2b5SSeongJae Park root = dbgfs_dirs[0]; 76575c1c2b5SSeongJae Park if (!root) 76675c1c2b5SSeongJae Park return -ENOENT; 76775c1c2b5SSeongJae Park 76875c1c2b5SSeongJae Park dir = debugfs_lookup(name, root); 76975c1c2b5SSeongJae Park if (!dir) 77075c1c2b5SSeongJae Park return -ENOENT; 77175c1c2b5SSeongJae Park 77275c1c2b5SSeongJae Park new_dirs = kmalloc_array(dbgfs_nr_ctxs - 1, sizeof(*dbgfs_dirs), 77375c1c2b5SSeongJae Park GFP_KERNEL); 77475c1c2b5SSeongJae Park if (!new_dirs) 77575c1c2b5SSeongJae Park return -ENOMEM; 77675c1c2b5SSeongJae Park 77775c1c2b5SSeongJae Park new_ctxs = kmalloc_array(dbgfs_nr_ctxs - 1, sizeof(*dbgfs_ctxs), 77875c1c2b5SSeongJae Park GFP_KERNEL); 77975c1c2b5SSeongJae Park if (!new_ctxs) { 78075c1c2b5SSeongJae Park kfree(new_dirs); 78175c1c2b5SSeongJae Park return -ENOMEM; 78275c1c2b5SSeongJae Park } 78375c1c2b5SSeongJae Park 78475c1c2b5SSeongJae Park for (i = 0, j = 0; i < dbgfs_nr_ctxs; i++) { 78575c1c2b5SSeongJae Park if (dbgfs_dirs[i] == dir) { 78675c1c2b5SSeongJae Park debugfs_remove(dbgfs_dirs[i]); 78775c1c2b5SSeongJae Park dbgfs_destroy_ctx(dbgfs_ctxs[i]); 78875c1c2b5SSeongJae Park continue; 78975c1c2b5SSeongJae Park } 79075c1c2b5SSeongJae Park new_dirs[j] = dbgfs_dirs[i]; 79175c1c2b5SSeongJae Park new_ctxs[j++] = dbgfs_ctxs[i]; 79275c1c2b5SSeongJae Park } 79375c1c2b5SSeongJae Park 79475c1c2b5SSeongJae Park kfree(dbgfs_dirs); 79575c1c2b5SSeongJae Park kfree(dbgfs_ctxs); 79675c1c2b5SSeongJae Park 79775c1c2b5SSeongJae Park dbgfs_dirs = new_dirs; 79875c1c2b5SSeongJae Park dbgfs_ctxs = new_ctxs; 79975c1c2b5SSeongJae Park dbgfs_nr_ctxs--; 80075c1c2b5SSeongJae Park 80175c1c2b5SSeongJae Park return 0; 80275c1c2b5SSeongJae Park } 80375c1c2b5SSeongJae Park 80475c1c2b5SSeongJae Park static ssize_t dbgfs_rm_context_write(struct file *file, 80575c1c2b5SSeongJae Park const char __user *buf, size_t count, loff_t *ppos) 80675c1c2b5SSeongJae Park { 80775c1c2b5SSeongJae Park char *kbuf; 8089210622aSRongwei Wang ssize_t ret; 80975c1c2b5SSeongJae Park char *ctx_name; 81075c1c2b5SSeongJae Park 81175c1c2b5SSeongJae Park kbuf = user_input_str(buf, count, ppos); 81275c1c2b5SSeongJae Park if (IS_ERR(kbuf)) 81375c1c2b5SSeongJae Park return PTR_ERR(kbuf); 81475c1c2b5SSeongJae Park ctx_name = kmalloc(count + 1, GFP_KERNEL); 81575c1c2b5SSeongJae Park if (!ctx_name) { 81675c1c2b5SSeongJae Park kfree(kbuf); 81775c1c2b5SSeongJae Park return -ENOMEM; 81875c1c2b5SSeongJae Park } 81975c1c2b5SSeongJae Park 82075c1c2b5SSeongJae Park /* Trim white space */ 82175c1c2b5SSeongJae Park if (sscanf(kbuf, "%s", ctx_name) != 1) { 82275c1c2b5SSeongJae Park ret = -EINVAL; 82375c1c2b5SSeongJae Park goto out; 82475c1c2b5SSeongJae Park } 82575c1c2b5SSeongJae Park 82675c1c2b5SSeongJae Park mutex_lock(&damon_dbgfs_lock); 8279210622aSRongwei Wang ret = dbgfs_rm_context(ctx_name); 8289210622aSRongwei Wang if (!ret) 8299210622aSRongwei Wang ret = count; 83075c1c2b5SSeongJae Park mutex_unlock(&damon_dbgfs_lock); 83175c1c2b5SSeongJae Park 83275c1c2b5SSeongJae Park out: 83375c1c2b5SSeongJae Park kfree(kbuf); 83475c1c2b5SSeongJae Park kfree(ctx_name); 83575c1c2b5SSeongJae Park return ret; 83675c1c2b5SSeongJae Park } 83775c1c2b5SSeongJae Park 8384bc05954SSeongJae Park static ssize_t dbgfs_monitor_on_read(struct file *file, 8394bc05954SSeongJae Park char __user *buf, size_t count, loff_t *ppos) 8404bc05954SSeongJae Park { 8414bc05954SSeongJae Park char monitor_on_buf[5]; 8424bc05954SSeongJae Park bool monitor_on = damon_nr_running_ctxs() != 0; 8434bc05954SSeongJae Park int len; 8444bc05954SSeongJae Park 8454bc05954SSeongJae Park len = scnprintf(monitor_on_buf, 5, monitor_on ? "on\n" : "off\n"); 8464bc05954SSeongJae Park 8474bc05954SSeongJae Park return simple_read_from_buffer(buf, count, ppos, monitor_on_buf, len); 8484bc05954SSeongJae Park } 8494bc05954SSeongJae Park 8504bc05954SSeongJae Park static ssize_t dbgfs_monitor_on_write(struct file *file, 8514bc05954SSeongJae Park const char __user *buf, size_t count, loff_t *ppos) 8524bc05954SSeongJae Park { 8539210622aSRongwei Wang ssize_t ret; 8544bc05954SSeongJae Park char *kbuf; 8554bc05954SSeongJae Park 8564bc05954SSeongJae Park kbuf = user_input_str(buf, count, ppos); 8574bc05954SSeongJae Park if (IS_ERR(kbuf)) 8584bc05954SSeongJae Park return PTR_ERR(kbuf); 8594bc05954SSeongJae Park 8604bc05954SSeongJae Park /* Remove white space */ 8614bc05954SSeongJae Park if (sscanf(kbuf, "%s", kbuf) != 1) { 8624bc05954SSeongJae Park kfree(kbuf); 8634bc05954SSeongJae Park return -EINVAL; 8644bc05954SSeongJae Park } 8654bc05954SSeongJae Park 8664bc05954SSeongJae Park if (!strncmp(kbuf, "on", count)) 8679210622aSRongwei Wang ret = damon_start(dbgfs_ctxs, dbgfs_nr_ctxs); 8684bc05954SSeongJae Park else if (!strncmp(kbuf, "off", count)) 8699210622aSRongwei Wang ret = damon_stop(dbgfs_ctxs, dbgfs_nr_ctxs); 8704bc05954SSeongJae Park else 8719210622aSRongwei Wang ret = -EINVAL; 8724bc05954SSeongJae Park 8739210622aSRongwei Wang if (!ret) 8749210622aSRongwei Wang ret = count; 8754bc05954SSeongJae Park kfree(kbuf); 8764bc05954SSeongJae Park return ret; 8774bc05954SSeongJae Park } 8784bc05954SSeongJae Park 87975c1c2b5SSeongJae Park static const struct file_operations mk_contexts_fops = { 88075c1c2b5SSeongJae Park .write = dbgfs_mk_context_write, 88175c1c2b5SSeongJae Park }; 88275c1c2b5SSeongJae Park 88375c1c2b5SSeongJae Park static const struct file_operations rm_contexts_fops = { 88475c1c2b5SSeongJae Park .write = dbgfs_rm_context_write, 88575c1c2b5SSeongJae Park }; 88675c1c2b5SSeongJae Park 8874bc05954SSeongJae Park static const struct file_operations monitor_on_fops = { 8884bc05954SSeongJae Park .read = dbgfs_monitor_on_read, 8894bc05954SSeongJae Park .write = dbgfs_monitor_on_write, 8904bc05954SSeongJae Park }; 8914bc05954SSeongJae Park 8924bc05954SSeongJae Park static int __init __damon_dbgfs_init(void) 8934bc05954SSeongJae Park { 8944bc05954SSeongJae Park struct dentry *dbgfs_root; 89575c1c2b5SSeongJae Park const char * const file_names[] = {"mk_contexts", "rm_contexts", 89675c1c2b5SSeongJae Park "monitor_on"}; 89775c1c2b5SSeongJae Park const struct file_operations *fops[] = {&mk_contexts_fops, 89875c1c2b5SSeongJae Park &rm_contexts_fops, &monitor_on_fops}; 8994bc05954SSeongJae Park int i; 9004bc05954SSeongJae Park 9014bc05954SSeongJae Park dbgfs_root = debugfs_create_dir("damon", NULL); 9024bc05954SSeongJae Park 9034bc05954SSeongJae Park for (i = 0; i < ARRAY_SIZE(file_names); i++) 9044bc05954SSeongJae Park debugfs_create_file(file_names[i], 0600, dbgfs_root, NULL, 9054bc05954SSeongJae Park fops[i]); 9064bc05954SSeongJae Park dbgfs_fill_ctx_dir(dbgfs_root, dbgfs_ctxs[0]); 9074bc05954SSeongJae Park 9084bc05954SSeongJae Park dbgfs_dirs = kmalloc_array(1, sizeof(dbgfs_root), GFP_KERNEL); 9094bc05954SSeongJae Park if (!dbgfs_dirs) { 9104bc05954SSeongJae Park debugfs_remove(dbgfs_root); 9114bc05954SSeongJae Park return -ENOMEM; 9124bc05954SSeongJae Park } 9134bc05954SSeongJae Park dbgfs_dirs[0] = dbgfs_root; 9144bc05954SSeongJae Park 9154bc05954SSeongJae Park return 0; 9164bc05954SSeongJae Park } 9174bc05954SSeongJae Park 9184bc05954SSeongJae Park /* 9194bc05954SSeongJae Park * Functions for the initialization 9204bc05954SSeongJae Park */ 9214bc05954SSeongJae Park 9224bc05954SSeongJae Park static int __init damon_dbgfs_init(void) 9234bc05954SSeongJae Park { 9244bc05954SSeongJae Park int rc; 9254bc05954SSeongJae Park 9264bc05954SSeongJae Park dbgfs_ctxs = kmalloc(sizeof(*dbgfs_ctxs), GFP_KERNEL); 9274bc05954SSeongJae Park if (!dbgfs_ctxs) 9284bc05954SSeongJae Park return -ENOMEM; 9294bc05954SSeongJae Park dbgfs_ctxs[0] = dbgfs_new_ctx(); 9304bc05954SSeongJae Park if (!dbgfs_ctxs[0]) { 9314bc05954SSeongJae Park kfree(dbgfs_ctxs); 9324bc05954SSeongJae Park return -ENOMEM; 9334bc05954SSeongJae Park } 9344bc05954SSeongJae Park dbgfs_nr_ctxs = 1; 9354bc05954SSeongJae Park 9364bc05954SSeongJae Park rc = __damon_dbgfs_init(); 9374bc05954SSeongJae Park if (rc) { 9384bc05954SSeongJae Park kfree(dbgfs_ctxs[0]); 9394bc05954SSeongJae Park kfree(dbgfs_ctxs); 9404bc05954SSeongJae Park pr_err("%s: dbgfs init failed\n", __func__); 9414bc05954SSeongJae Park } 9424bc05954SSeongJae Park 9434bc05954SSeongJae Park return rc; 9444bc05954SSeongJae Park } 9454bc05954SSeongJae Park 9464bc05954SSeongJae Park module_init(damon_dbgfs_init); 94717ccae8bSSeongJae Park 94817ccae8bSSeongJae Park #include "dbgfs-test.h" 949