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mm/damon/sysfs: implement addr_unit file under context dir

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Only DAMON kernel API callers can use addr_unit parameter.  Implement a
sysfs file to let DAMON sysfs ABI users use it.

Additionally, addr_unit must be set to a non-zero value.

Link: https://lkml.kernel.org/r/20250828171242.59810-8-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Quanmin Yan <yanquanmin1@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: ze zuo <zuoze1@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2025-08-28 10:12:38 -07:00 committed by Andrew Morton
parent 01e7ee33a0
commit 540a2aebc6
1 changed files with 33 additions and 0 deletions
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33
mm/damon/sysfs.c
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@ -834,6 +834,7 @@ static const struct damon_sysfs_ops_name damon_sysfs_ops_names[] = {
struct damon_sysfs_context { struct damon_sysfs_context {
struct kobject kobj; struct kobject kobj;
enum damon_ops_id ops_id; enum damon_ops_id ops_id;
unsigned long addr_unit;
struct damon_sysfs_attrs *attrs; struct damon_sysfs_attrs *attrs;
struct damon_sysfs_targets *targets; struct damon_sysfs_targets *targets;
struct damon_sysfs_schemes *schemes; struct damon_sysfs_schemes *schemes;
@ -849,6 +850,7 @@ static struct damon_sysfs_context *damon_sysfs_context_alloc(
return NULL; return NULL;
context->kobj = (struct kobject){}; context->kobj = (struct kobject){};
context->ops_id = ops_id; context->ops_id = ops_id;
context->addr_unit = 1;
return context; return context;
} }
@ -997,6 +999,32 @@ static ssize_t operations_store(struct kobject *kobj,
return -EINVAL; return -EINVAL;
} }
static ssize_t addr_unit_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct damon_sysfs_context *context = container_of(kobj,
struct damon_sysfs_context, kobj);
return sysfs_emit(buf, "%lu\n", context->addr_unit);
}
static ssize_t addr_unit_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
struct damon_sysfs_context *context = container_of(kobj,
struct damon_sysfs_context, kobj);
unsigned long input_addr_unit;
int err = kstrtoul(buf, 0, &input_addr_unit);
if (err)
return err;
if (!input_addr_unit)
return -EINVAL;
context->addr_unit = input_addr_unit;
return count;
}
static void damon_sysfs_context_release(struct kobject *kobj) static void damon_sysfs_context_release(struct kobject *kobj)
{ {
kfree(container_of(kobj, struct damon_sysfs_context, kobj)); kfree(container_of(kobj, struct damon_sysfs_context, kobj));
@ -1008,9 +1036,13 @@ static struct kobj_attribute damon_sysfs_context_avail_operations_attr =
static struct kobj_attribute damon_sysfs_context_operations_attr = static struct kobj_attribute damon_sysfs_context_operations_attr =
__ATTR_RW_MODE(operations, 0600); __ATTR_RW_MODE(operations, 0600);
static struct kobj_attribute damon_sysfs_context_addr_unit_attr =
__ATTR_RW_MODE(addr_unit, 0600);
static struct attribute *damon_sysfs_context_attrs[] = { static struct attribute *damon_sysfs_context_attrs[] = {
&damon_sysfs_context_avail_operations_attr.attr, &damon_sysfs_context_avail_operations_attr.attr,
&damon_sysfs_context_operations_attr.attr, &damon_sysfs_context_operations_attr.attr,
&damon_sysfs_context_addr_unit_attr.attr,
NULL, NULL,
}; };
ATTRIBUTE_GROUPS(damon_sysfs_context); ATTRIBUTE_GROUPS(damon_sysfs_context);
@ -1397,6 +1429,7 @@ static int damon_sysfs_apply_inputs(struct damon_ctx *ctx,
err = damon_select_ops(ctx, sys_ctx->ops_id); err = damon_select_ops(ctx, sys_ctx->ops_id);
if (err) if (err)
return err; return err;
ctx->addr_unit = sys_ctx->addr_unit;
err = damon_sysfs_set_attrs(ctx, sys_ctx->attrs); err = damon_sysfs_set_attrs(ctx, sys_ctx->attrs);
if (err) if (err)
return err; return err;