^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * DAMON Debugfs Interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: SeongJae Park <sjpark@amazon.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #define pr_fmt(fmt) "damon-dbgfs: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/damon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/page_idle.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static struct damon_ctx **dbgfs_ctxs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int dbgfs_nr_ctxs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static struct dentry **dbgfs_dirs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) static DEFINE_MUTEX(damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Returns non-empty string on success, negative error code otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static char *user_input_str(const char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /* We do not accept continuous write */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) if (*ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) kbuf = kmalloc(count + 1, GFP_KERNEL | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (!kbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) ret = simple_write_to_buffer(kbuf, count + 1, ppos, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (ret != count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return ERR_PTR(-EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) kbuf[ret] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static ssize_t dbgfs_attrs_read(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) char kbuf[128];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) ret = scnprintf(kbuf, ARRAY_SIZE(kbuf), "%lu %lu %lu %lu %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) ctx->sample_interval, ctx->aggr_interval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ctx->primitive_update_interval, ctx->min_nr_regions,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) ctx->max_nr_regions);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return simple_read_from_buffer(buf, count, ppos, kbuf, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static ssize_t dbgfs_attrs_write(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) const char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) unsigned long s, a, r, minr, maxr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) kbuf = user_input_str(buf, count, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (IS_ERR(kbuf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return PTR_ERR(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (sscanf(kbuf, "%lu %lu %lu %lu %lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) &s, &a, &r, &minr, &maxr) != 5) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (ctx->kdamond) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) goto unlock_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) ret = damon_set_attrs(ctx, s, a, r, minr, maxr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) unlock_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) static ssize_t sprint_schemes(struct damon_ctx *c, char *buf, ssize_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) struct damos *s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) int written = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) damon_for_each_scheme(s, c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) rc = scnprintf(&buf[written], len - written,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) "%lu %lu %u %u %u %u %d %lu %lu %lu %u %u %u %d %lu %lu %lu %lu %lu %lu %lu %lu %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) s->min_sz_region, s->max_sz_region,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) s->min_nr_accesses, s->max_nr_accesses,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) s->min_age_region, s->max_age_region,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) s->action,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) s->quota.ms, s->quota.sz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) s->quota.reset_interval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) s->quota.weight_sz,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) s->quota.weight_nr_accesses,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) s->quota.weight_age,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) s->wmarks.metric, s->wmarks.interval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) s->wmarks.high, s->wmarks.mid, s->wmarks.low,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) s->stat.nr_tried, s->stat.sz_tried,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) s->stat.nr_applied, s->stat.sz_applied,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) s->stat.qt_exceeds);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) written += rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static ssize_t dbgfs_schemes_read(struct file *file, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) kbuf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (!kbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) len = sprint_schemes(ctx, kbuf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) len = simple_read_from_buffer(buf, count, ppos, kbuf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static void free_schemes_arr(struct damos **schemes, ssize_t nr_schemes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) ssize_t i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) for (i = 0; i < nr_schemes; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) kfree(schemes[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) kfree(schemes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static bool damos_action_valid(int action)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) switch (action) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) case DAMOS_WILLNEED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) case DAMOS_COLD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) case DAMOS_PAGEOUT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) case DAMOS_HUGEPAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) case DAMOS_NOHUGEPAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) case DAMOS_STAT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * Converts a string into an array of struct damos pointers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * Returns an array of struct damos pointers that converted if the conversion
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * success, or NULL otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) static struct damos **str_to_schemes(const char *str, ssize_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) ssize_t *nr_schemes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct damos *scheme, **schemes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) const int max_nr_schemes = 256;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) int pos = 0, parsed, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) unsigned long min_sz, max_sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) unsigned int min_nr_a, max_nr_a, min_age, max_age;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) unsigned int action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) schemes = kmalloc_array(max_nr_schemes, sizeof(scheme),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (!schemes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) *nr_schemes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) while (pos < len && *nr_schemes < max_nr_schemes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) struct damos_quota quota = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) struct damos_watermarks wmarks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) ret = sscanf(&str[pos],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) "%lu %lu %u %u %u %u %u %lu %lu %lu %u %u %u %u %lu %lu %lu %lu%n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) &min_sz, &max_sz, &min_nr_a, &max_nr_a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) &min_age, &max_age, &action, "a.ms,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) "a.sz, "a.reset_interval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) "a.weight_sz, "a.weight_nr_accesses,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) "a.weight_age, &wmarks.metric,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) &wmarks.interval, &wmarks.high, &wmarks.mid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) &wmarks.low, &parsed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (ret != 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) if (!damos_action_valid(action))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (min_sz > max_sz || min_nr_a > max_nr_a || min_age > max_age)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (wmarks.high < wmarks.mid || wmarks.high < wmarks.low ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) wmarks.mid < wmarks.low)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) pos += parsed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) scheme = damon_new_scheme(min_sz, max_sz, min_nr_a, max_nr_a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) min_age, max_age, action, "a, &wmarks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (!scheme)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) schemes[*nr_schemes] = scheme;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) *nr_schemes += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return schemes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) free_schemes_arr(schemes, *nr_schemes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static ssize_t dbgfs_schemes_write(struct file *file, const char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) struct damos **schemes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) ssize_t nr_schemes = 0, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) kbuf = user_input_str(buf, count, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (IS_ERR(kbuf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) return PTR_ERR(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) schemes = str_to_schemes(kbuf, count, &nr_schemes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) if (!schemes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) if (ctx->kdamond) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) goto unlock_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) ret = damon_set_schemes(ctx, schemes, nr_schemes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) nr_schemes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) unlock_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) free_schemes_arr(schemes, nr_schemes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static inline bool targetid_is_pid(const struct damon_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) return ctx->primitive.target_valid == damon_va_target_valid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static ssize_t sprint_target_ids(struct damon_ctx *ctx, char *buf, ssize_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) struct damon_target *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) unsigned long id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) int written = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) damon_for_each_target(t, ctx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) id = t->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) if (targetid_is_pid(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) /* Show pid numbers to debugfs users */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) id = (unsigned long)pid_vnr((struct pid *)id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) rc = scnprintf(&buf[written], len - written, "%lu ", id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) written += rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (written)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) written -= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) written += scnprintf(&buf[written], len - written, "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) return written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) static ssize_t dbgfs_target_ids_read(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) char ids_buf[320];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) len = sprint_target_ids(ctx, ids_buf, 320);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return simple_read_from_buffer(buf, count, ppos, ids_buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) * Converts a string into an array of unsigned long integers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * Returns an array of unsigned long integers if the conversion success, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * NULL otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) static unsigned long *str_to_target_ids(const char *str, ssize_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) ssize_t *nr_ids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) unsigned long *ids;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) const int max_nr_ids = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) unsigned long id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) int pos = 0, parsed, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) *nr_ids = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) ids = kmalloc_array(max_nr_ids, sizeof(id), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (!ids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) while (*nr_ids < max_nr_ids && pos < len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) ret = sscanf(&str[pos], "%lu%n", &id, &parsed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) pos += parsed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (ret != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) ids[*nr_ids] = id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) *nr_ids += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return ids;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) static void dbgfs_put_pids(unsigned long *ids, int nr_ids)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) for (i = 0; i < nr_ids; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) put_pid((struct pid *)ids[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static ssize_t dbgfs_target_ids_write(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) const char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct damon_target *t, *next_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) bool id_is_pid = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) unsigned long *targets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) ssize_t nr_targets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) kbuf = user_input_str(buf, count, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (IS_ERR(kbuf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) return PTR_ERR(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (!strncmp(kbuf, "paddr\n", count)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) id_is_pid = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) /* target id is meaningless here, but we set it just for fun */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) scnprintf(kbuf, count, "42 ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) targets = str_to_target_ids(kbuf, count, &nr_targets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) if (!targets) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) if (id_is_pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) for (i = 0; i < nr_targets; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) targets[i] = (unsigned long)find_get_pid(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) (int)targets[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (!targets[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) dbgfs_put_pids(targets, i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) goto free_targets_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (ctx->kdamond) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (id_is_pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) dbgfs_put_pids(targets, nr_targets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) goto unlock_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) /* remove previously set targets */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) damon_for_each_target_safe(t, next_t, ctx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) if (targetid_is_pid(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) put_pid((struct pid *)t->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) damon_destroy_target(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /* Configure the context for the address space type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) if (id_is_pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) damon_va_set_primitives(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) damon_pa_set_primitives(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) ret = damon_set_targets(ctx, targets, nr_targets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (id_is_pid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) dbgfs_put_pids(targets, nr_targets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) unlock_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) free_targets_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) kfree(targets);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) static ssize_t sprint_init_regions(struct damon_ctx *c, char *buf, ssize_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) struct damon_target *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) struct damon_region *r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) int written = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) damon_for_each_target(t, c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) damon_for_each_region(r, t) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) rc = scnprintf(&buf[written], len - written,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) "%lu %lu %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) t->id, r->ar.start, r->ar.end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) if (!rc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) written += rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) return written;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) static ssize_t dbgfs_init_regions_read(struct file *file, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) kbuf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (!kbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (ctx->kdamond) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) len = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) len = sprint_init_regions(ctx, kbuf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) len = simple_read_from_buffer(buf, count, ppos, kbuf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) static int add_init_region(struct damon_ctx *c,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) unsigned long target_id, struct damon_addr_range *ar)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) struct damon_target *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) struct damon_region *r, *prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) unsigned long id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) int rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (ar->start >= ar->end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) damon_for_each_target(t, c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) id = t->id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) if (targetid_is_pid(c))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) id = (unsigned long)pid_vnr((struct pid *)id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) if (id == target_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) r = damon_new_region(ar->start, ar->end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) if (!r)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) damon_add_region(r, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (damon_nr_regions(t) > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) prev = damon_prev_region(r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) if (prev->ar.end > r->ar.start) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) damon_destroy_region(r, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) static int set_init_regions(struct damon_ctx *c, const char *str, ssize_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) struct damon_target *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) struct damon_region *r, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) int pos = 0, parsed, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) unsigned long target_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) struct damon_addr_range ar;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) damon_for_each_target(t, c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) damon_for_each_region_safe(r, next, t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) damon_destroy_region(r, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) while (pos < len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) ret = sscanf(&str[pos], "%lu %lu %lu%n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) &target_id, &ar.start, &ar.end, &parsed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) if (ret != 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) err = add_init_region(c, target_id, &ar);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) pos += parsed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) damon_for_each_target(t, c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) damon_for_each_region_safe(r, next, t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) damon_destroy_region(r, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) static ssize_t dbgfs_init_regions_write(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) const char __user *buf, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) ssize_t ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) kbuf = user_input_str(buf, count, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) if (IS_ERR(kbuf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return PTR_ERR(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) if (ctx->kdamond) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) ret = -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) goto unlock_out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) err = set_init_regions(ctx, kbuf, ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) ret = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) unlock_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) static ssize_t dbgfs_kdamond_pid_read(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) struct damon_ctx *ctx = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) kbuf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) if (!kbuf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (ctx->kdamond)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) len = scnprintf(kbuf, count, "%d\n", ctx->kdamond->pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) len = scnprintf(kbuf, count, "none\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) if (!len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) len = simple_read_from_buffer(buf, count, ppos, kbuf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) static int damon_dbgfs_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) file->private_data = inode->i_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return nonseekable_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) static const struct file_operations attrs_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) .open = damon_dbgfs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) .read = dbgfs_attrs_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) .write = dbgfs_attrs_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) static const struct file_operations schemes_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) .open = damon_dbgfs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) .read = dbgfs_schemes_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) .write = dbgfs_schemes_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) static const struct file_operations target_ids_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) .open = damon_dbgfs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) .read = dbgfs_target_ids_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) .write = dbgfs_target_ids_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) static const struct file_operations init_regions_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) .open = damon_dbgfs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) .read = dbgfs_init_regions_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) .write = dbgfs_init_regions_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) static const struct file_operations kdamond_pid_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) .open = damon_dbgfs_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) .read = dbgfs_kdamond_pid_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) static void dbgfs_fill_ctx_dir(struct dentry *dir, struct damon_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) const char * const file_names[] = {"attrs", "schemes", "target_ids",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) "init_regions", "kdamond_pid"};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) const struct file_operations *fops[] = {&attrs_fops, &schemes_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) &target_ids_fops, &init_regions_fops, &kdamond_pid_fops};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) for (i = 0; i < ARRAY_SIZE(file_names); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) debugfs_create_file(file_names[i], 0600, dir, ctx, fops[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) static void dbgfs_before_terminate(struct damon_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) struct damon_target *t, *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) if (!targetid_is_pid(ctx))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) mutex_lock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) damon_for_each_target_safe(t, next, ctx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) put_pid((struct pid *)t->id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) damon_destroy_target(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) mutex_unlock(&ctx->kdamond_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) static struct damon_ctx *dbgfs_new_ctx(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) struct damon_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) ctx = damon_new_ctx();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) if (!ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) damon_va_set_primitives(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) ctx->callback.before_terminate = dbgfs_before_terminate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) return ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) static void dbgfs_destroy_ctx(struct damon_ctx *ctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) damon_destroy_ctx(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) * Make a context of @name and create a debugfs directory for it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) * This function should be called while holding damon_dbgfs_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) * Returns 0 on success, negative error code otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) static int dbgfs_mk_context(char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) struct dentry *root, **new_dirs, *new_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) struct damon_ctx **new_ctxs, *new_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) if (damon_nr_running_ctxs())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) new_ctxs = krealloc(dbgfs_ctxs, sizeof(*dbgfs_ctxs) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) (dbgfs_nr_ctxs + 1), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) if (!new_ctxs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) dbgfs_ctxs = new_ctxs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) new_dirs = krealloc(dbgfs_dirs, sizeof(*dbgfs_dirs) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) (dbgfs_nr_ctxs + 1), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) if (!new_dirs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) dbgfs_dirs = new_dirs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) root = dbgfs_dirs[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) if (!root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) new_dir = debugfs_create_dir(name, root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) dbgfs_dirs[dbgfs_nr_ctxs] = new_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) new_ctx = dbgfs_new_ctx();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) if (!new_ctx) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) debugfs_remove(new_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) dbgfs_dirs[dbgfs_nr_ctxs] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) dbgfs_ctxs[dbgfs_nr_ctxs] = new_ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) dbgfs_fill_ctx_dir(dbgfs_dirs[dbgfs_nr_ctxs],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) dbgfs_ctxs[dbgfs_nr_ctxs]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) dbgfs_nr_ctxs++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) static ssize_t dbgfs_mk_context_write(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) const char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) char *ctx_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) kbuf = user_input_str(buf, count, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) if (IS_ERR(kbuf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) return PTR_ERR(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) ctx_name = kmalloc(count + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) if (!ctx_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) /* Trim white space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) if (sscanf(kbuf, "%s", ctx_name) != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) mutex_lock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) ret = dbgfs_mk_context(ctx_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) mutex_unlock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) kfree(ctx_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) * Remove a context of @name and its debugfs directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) * This function should be called while holding damon_dbgfs_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) * Return 0 on success, negative error code otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) static int dbgfs_rm_context(char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) struct dentry *root, *dir, **new_dirs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) struct damon_ctx **new_ctxs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) int i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) if (damon_nr_running_ctxs())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) root = dbgfs_dirs[0];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) if (!root)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) dir = debugfs_lookup(name, root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) if (!dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) new_dirs = kmalloc_array(dbgfs_nr_ctxs - 1, sizeof(*dbgfs_dirs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) if (!new_dirs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) new_ctxs = kmalloc_array(dbgfs_nr_ctxs - 1, sizeof(*dbgfs_ctxs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) if (!new_ctxs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) kfree(new_dirs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) for (i = 0, j = 0; i < dbgfs_nr_ctxs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) if (dbgfs_dirs[i] == dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) debugfs_remove(dbgfs_dirs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) dbgfs_destroy_ctx(dbgfs_ctxs[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) new_dirs[j] = dbgfs_dirs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) new_ctxs[j++] = dbgfs_ctxs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) kfree(dbgfs_dirs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) kfree(dbgfs_ctxs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) dbgfs_dirs = new_dirs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) dbgfs_ctxs = new_ctxs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) dbgfs_nr_ctxs--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) static ssize_t dbgfs_rm_context_write(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) const char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) char *ctx_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) kbuf = user_input_str(buf, count, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) if (IS_ERR(kbuf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) return PTR_ERR(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) ctx_name = kmalloc(count + 1, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) if (!ctx_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) /* Trim white space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) if (sscanf(kbuf, "%s", ctx_name) != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) mutex_lock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) ret = dbgfs_rm_context(ctx_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) mutex_unlock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) kfree(ctx_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) static ssize_t dbgfs_monitor_on_read(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) char monitor_on_buf[5];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) bool monitor_on = damon_nr_running_ctxs() != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) len = scnprintf(monitor_on_buf, 5, monitor_on ? "on\n" : "off\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) return simple_read_from_buffer(buf, count, ppos, monitor_on_buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) static ssize_t dbgfs_monitor_on_write(struct file *file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) const char __user *buf, size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) char *kbuf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) kbuf = user_input_str(buf, count, ppos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) if (IS_ERR(kbuf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) return PTR_ERR(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) /* Remove white space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) if (sscanf(kbuf, "%s", kbuf) != 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) mutex_lock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) if (!strncmp(kbuf, "on", count)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) for (i = 0; i < dbgfs_nr_ctxs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) if (damon_targets_empty(dbgfs_ctxs[i])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) mutex_unlock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) ret = damon_start(dbgfs_ctxs, dbgfs_nr_ctxs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) } else if (!strncmp(kbuf, "off", count)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) ret = damon_stop(dbgfs_ctxs, dbgfs_nr_ctxs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) mutex_unlock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) if (!ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) ret = count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) kfree(kbuf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) static const struct file_operations mk_contexts_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) .write = dbgfs_mk_context_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) static const struct file_operations rm_contexts_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) .write = dbgfs_rm_context_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) static const struct file_operations monitor_on_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) .read = dbgfs_monitor_on_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) .write = dbgfs_monitor_on_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) static int __init __damon_dbgfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) struct dentry *dbgfs_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) const char * const file_names[] = {"mk_contexts", "rm_contexts",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) "monitor_on"};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) const struct file_operations *fops[] = {&mk_contexts_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) &rm_contexts_fops, &monitor_on_fops};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) dbgfs_root = debugfs_create_dir("damon", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) for (i = 0; i < ARRAY_SIZE(file_names); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) debugfs_create_file(file_names[i], 0600, dbgfs_root, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) fops[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) dbgfs_fill_ctx_dir(dbgfs_root, dbgfs_ctxs[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) dbgfs_dirs = kmalloc_array(1, sizeof(dbgfs_root), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) if (!dbgfs_dirs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) debugfs_remove(dbgfs_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) dbgfs_dirs[0] = dbgfs_root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) * Functions for the initialization
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) static int __init damon_dbgfs_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) int rc = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) mutex_lock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) dbgfs_ctxs = kmalloc(sizeof(*dbgfs_ctxs), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) if (!dbgfs_ctxs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) dbgfs_ctxs[0] = dbgfs_new_ctx();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) if (!dbgfs_ctxs[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) kfree(dbgfs_ctxs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) dbgfs_nr_ctxs = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) rc = __damon_dbgfs_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) kfree(dbgfs_ctxs[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) kfree(dbgfs_ctxs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) pr_err("%s: dbgfs init failed\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) mutex_unlock(&damon_dbgfs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) module_init(damon_dbgfs_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) #include "dbgfs-test.h"
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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