1 // SPDX-License-Identifier: GPL-2.0
19 /* Miscellaneous res name, keep it in sync with enum misc_res_type */
24 	/* AMD SEV-ES ASIDs resource */
43  * parent_misc() - Get the parent of the passed misc cgroup.
48  * * struct misc_cg* - Parent of the @cgroup.
49  * * %NULL - If @cgroup is null or the passed cgroup does not have a parent.
53 	return cgroup ? css_misc(cgroup->css.parent) : NULL;  in parent_misc()
57  * valid_type() - Check if @type is valid or not.
62  * * true - If valid type.
63  * * false - If not valid type.
71  * misc_cg_res_total_usage() - Get the current total usage of the resource.
87  * misc_cg_set_capacity() - Set the capacity of the misc cgroup res.
95  * * %0 - Successfully registered the capacity.
96  * * %-EINVAL - If @type is invalid.
101 		return -EINVAL;  in misc_cg_set_capacity()
109  * misc_cg_cancel_charge() - Cancel the charge from the misc cgroup.
119 	WARN_ONCE(atomic64_add_negative(-amount, &cg->res[type].usage),  in misc_cg_cancel_charge()
129 		old = atomic64_read(&res->watermark);  in misc_cg_update_watermark()
132 		if (atomic64_cmpxchg(&res->watermark, old, new_usage) == old)  in misc_cg_update_watermark()
139 	atomic64_inc(&cg->res[type].events_local);  in misc_cg_event()
140 	cgroup_file_notify(&cg->events_local_file);  in misc_cg_event()
143 		atomic64_inc(&cg->res[type].events);  in misc_cg_event()
144 		cgroup_file_notify(&cg->events_file);  in misc_cg_event()
149  * misc_cg_try_charge() - Try charging the misc cgroup.
159  * * %0 - If successfully charged.
160  * * -EINVAL - If @type is invalid or misc res has 0 capacity.
161  * * -EBUSY - If max limit will be crossed or total usage will be more than the
172 		return -EINVAL;  in misc_cg_try_charge()
178 		res = &i->res[type];  in misc_cg_try_charge()
180 		new_usage = atomic64_add_return(amount, &res->usage);  in misc_cg_try_charge()
181 		if (new_usage > READ_ONCE(res->max) ||  in misc_cg_try_charge()
183 			ret = -EBUSY;  in misc_cg_try_charge()
201  * misc_cg_uncharge() - Uncharge the misc cgroup.
221  * misc_cg_max_show() - Show the misc cgroup max limit.
236 			max = READ_ONCE(cg->res[i].max);  in misc_cg_max_show()
249  * misc_cg_max_write() - Update the maximum limit of the cgroup.
262  * * >= 0 - Number of bytes processed in the input.
263  * * -EINVAL - If buf is not valid.
264  * * -ERANGE - If number is bigger than the u64 capacity.
273 	char *token;  in misc_cg_max_write()  local
276 	token = strsep(&buf, " ");  in misc_cg_max_write()
278 	if (!token || !buf)  in misc_cg_max_write()
279 		return -EINVAL;  in misc_cg_max_write()
282 		if (!strcmp(misc_res_name[i], token)) {  in misc_cg_max_write()
289 		return -EINVAL;  in misc_cg_max_write()
302 		WRITE_ONCE(cg->res[type].max, max);  in misc_cg_max_write()
304 		ret = -EINVAL;  in misc_cg_max_write()
310  * misc_cg_current_show() - Show the current usage of the misc cgroup.
324 		usage = atomic64_read(&cg->res[i].usage);  in misc_cg_current_show()
333  * misc_cg_peak_show() - Show the peak usage of the misc cgroup.
347 		watermark = atomic64_read(&cg->res[i].watermark);  in misc_cg_peak_show()
356  * misc_cg_capacity_show() - Show the total capacity of misc res on the host.
387 			events = atomic64_read(&cg->res[i].events_local);  in __misc_events_show()
389 			events = atomic64_read(&cg->res[i].events);  in __misc_events_show()
443  * misc_cg_alloc() - Allocate misc cgroup.
448  * * struct cgroup_subsys_state* - css of the allocated cgroup.
449  * * ERR_PTR(-ENOMEM) - No memory available to allocate.
462 			return ERR_PTR(-ENOMEM);  in misc_cg_alloc()
466 		WRITE_ONCE(cg->res[i].max, MAX_NUM);  in misc_cg_alloc()
467 		atomic64_set(&cg->res[i].usage, 0);  in misc_cg_alloc()
470 	return &cg->css;  in misc_cg_alloc()
474  * misc_cg_free() - Free the misc cgroup.