1 // SPDX-License-Identifier: GPL-2.0-only
43 	/* if PG_mte_tagged is set, tags have already been initialised */  in mte_sync_tags()
45 		if (!test_and_set_bit(PG_mte_tagged, &page->flags))  in mte_sync_tags()
64 	 * tagged, return non-zero to avoid KSM merging. If only one of the  in memcmp_pages()
65 	 * pages is tagged, set_pte_at() may zero or change the tags of the  in memcmp_pages()
68 	if (test_bit(PG_mte_tagged, &page1->flags) ||  in memcmp_pages()
69 	    test_bit(PG_mte_tagged, &page2->flags))  in memcmp_pages()
85 	 * mte_thread_switch() checks current->thread.sctlr_tcf0 as an  in set_sctlr_el1_tcf0()
90 	current->thread.sctlr_tcf0 = tcf0;  in set_sctlr_el1_tcf0()
110 	current->thread.gcr_user_incl = incl;  in set_gcr_el1_excl()
135 	if (current->thread.sctlr_tcf0 != next->thread.sctlr_tcf0)  in mte_thread_switch()
136 		update_sctlr_el1_tcf0(next->thread.sctlr_tcf0);  in mte_thread_switch()
137 	update_gcr_el1_excl(next->thread.gcr_user_incl);  in mte_thread_switch()
145 	update_gcr_el1_excl(current->thread.gcr_user_incl);  in mte_suspend_exit()
167 		return -EINVAL;  in set_mte_ctrl()
171 		task->thread.sctlr_tcf0 = tcf0;  in set_mte_ctrl()
172 		task->thread.gcr_user_incl = gcr_incl;  in set_mte_ctrl()
188 	ret = task->thread.gcr_user_incl << PR_MTE_TAG_SHIFT;  in get_mte_ctrl()
190 	switch (task->thread.sctlr_tcf0) {  in get_mte_ctrl()
213 	void __user *buf = kiov->iov_base;  in __access_remote_tags()
214 	size_t len = kiov->iov_len;  in __access_remote_tags()
219 		return -EFAULT;  in __access_remote_tags()
222 		return -EIO;  in __access_remote_tags()
241 		if (!test_bit(PG_mte_tagged, &page->flags)) {  in __access_remote_tags()
242 			ret = -EOPNOTSUPP;  in __access_remote_tags()
249 		tags = min(len, (PAGE_SIZE - offset) / MTE_GRANULE_SIZE);  in __access_remote_tags()
264 		len -= tags;  in __access_remote_tags()
271 	kiov->iov_len = buf - kiov->iov_base;  in __access_remote_tags()
272 	if (!kiov->iov_len) {  in __access_remote_tags()
275 			return -EIO;  in __access_remote_tags()
277 			return -EFAULT;  in __access_remote_tags()
295 		return -EPERM;  in access_remote_tags()
297 	if (!tsk->ptrace || (current != tsk->parent) ||  in access_remote_tags()
299 	     !ptracer_capable(tsk, mm->user_ns))) {  in access_remote_tags()
301 		return -EPERM;  in access_remote_tags()
319 		return -EIO;  in mte_ptrace_copy_tags()
321 	if (get_user(kiov.iov_base, &uiov->iov_base) ||  in mte_ptrace_copy_tags()
322 	    get_user(kiov.iov_len, &uiov->iov_len))  in mte_ptrace_copy_tags()
323 		return -EFAULT;  in mte_ptrace_copy_tags()
333 		ret = put_user(kiov.iov_len, &uiov->iov_len);  in mte_ptrace_copy_tags()