1 // SPDX-License-Identifier: GPL-2.0-only
28 	(CIRC_CNT((circ)->head, (circ)->tail, ACPI_AML_BUF_SIZE))
30 	(CIRC_CNT_TO_END((circ)->head, (circ)->tail, ACPI_AML_BUF_SIZE))
32 	(CIRC_SPACE((circ)->head, (circ)->tail, ACPI_AML_BUF_SIZE))
34 	(CIRC_SPACE_TO_END((circ)->head, (circ)->tail, ACPI_AML_BUF_SIZE))
72 static inline bool __acpi_aml_access_ok(unsigned long flag)  in __acpi_aml_access_ok()  argument
85 	if ((flag & ACPI_AML_KERN) &&  in __acpi_aml_access_ok()
91 static inline bool __acpi_aml_readable(struct circ_buf *circ, unsigned long flag)  in __acpi_aml_readable()  argument
97 	if (!(acpi_aml_io.flags & flag) && circ_count(circ))  in __acpi_aml_readable()
102 static inline bool __acpi_aml_writable(struct circ_buf *circ, unsigned long flag)  in __acpi_aml_writable()  argument
108 	if (!(acpi_aml_io.flags & flag) && circ_space(circ))  in __acpi_aml_writable()
203 static int acpi_aml_lock_write(struct circ_buf *circ, unsigned long flag)  in acpi_aml_lock_write()  argument
208 	if (!__acpi_aml_access_ok(flag)) {  in acpi_aml_lock_write()
209 		ret = -EFAULT;  in acpi_aml_lock_write()
212 	if (!__acpi_aml_writable(circ, flag)) {  in acpi_aml_lock_write()
213 		ret = -EAGAIN;  in acpi_aml_lock_write()
216 	acpi_aml_io.flags |= flag;  in acpi_aml_lock_write()
222 static int acpi_aml_lock_read(struct circ_buf *circ, unsigned long flag)  in acpi_aml_lock_read()  argument
227 	if (!__acpi_aml_access_ok(flag)) {  in acpi_aml_lock_read()
228 		ret = -EFAULT;  in acpi_aml_lock_read()
231 	if (!__acpi_aml_readable(circ, flag)) {  in acpi_aml_lock_read()
232 		ret = -EAGAIN;  in acpi_aml_lock_read()
235 	acpi_aml_io.flags |= flag;  in acpi_aml_lock_read()
241 static void acpi_aml_unlock_fifo(unsigned long flag, bool wakeup)  in acpi_aml_unlock_fifo()  argument
244 	acpi_aml_io.flags &= ~flag;  in acpi_aml_unlock_fifo()
260 	/* sync tail before inserting logs */  in acpi_aml_write_kern()
262 	p = &crc->buf[crc->head];  in acpi_aml_write_kern()
265 	/* sync head after inserting logs */  in acpi_aml_write_kern()
267 	crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_write_kern()
281 	/* sync head before removing cmds */  in acpi_aml_readb_kern()
283 	p = &crc->buf[crc->tail];  in acpi_aml_readb_kern()
285 	/* sync tail before inserting cmds */  in acpi_aml_readb_kern()
287 	crc->tail = (crc->tail + 1) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_readb_kern()
293  * acpi_aml_write_log() - Capture debugger output
306 		return -ENODEV;  in acpi_aml_write_log()
312 		if (ret == -EAGAIN) {  in acpi_aml_write_log()
326 		count -= ret;  in acpi_aml_write_log()
332  * acpi_aml_read_cmd() - Capture debugger input
356 		if (ret == -EAGAIN) {  in acpi_aml_read_cmd()
370 		count--;  in acpi_aml_read_cmd()
376 			*(msg + size - 1) = '\0';  in acpi_aml_read_cmd()
400 	acpi_aml_io.usages--;  in acpi_aml_thread()
411  * acpi_aml_create_thread() - Create AML debugger thread
453 		return -EINVAL;  in acpi_aml_wait_command_ready()
473 		ret = -EBUSY;  in acpi_aml_open()
476 	if ((file->f_flags & O_ACCMODE) != O_WRONLY) {  in acpi_aml_open()
482 			ret = -EBUSY;  in acpi_aml_open()
494 			ret = -ENODEV;  in acpi_aml_open()
506 			ret = -EINVAL;  in acpi_aml_open()
531 	acpi_aml_io.users--;  in acpi_aml_release()
582 	/* sync head before removing logs */  in acpi_aml_read_user()
584 	p = &crc->buf[crc->tail];  in acpi_aml_read_user()
587 		ret = -EFAULT;  in acpi_aml_read_user()
590 	/* sync tail after removing logs */  in acpi_aml_read_user()
592 	crc->tail = (crc->tail + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_read_user()
608 		return -EFAULT;  in acpi_aml_read()
613 		if (ret == -EAGAIN) {  in acpi_aml_read()
614 			if (file->f_flags & O_NONBLOCK)  in acpi_aml_read()
634 			count -= ret;  in acpi_aml_read()
652 	/* sync tail before inserting cmds */  in acpi_aml_write_user()
654 	p = &crc->buf[crc->head];  in acpi_aml_write_user()
657 		ret = -EFAULT;  in acpi_aml_write_user()
660 	/* sync head after inserting cmds */  in acpi_aml_write_user()
662 	crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_write_user()
678 		return -EFAULT;  in acpi_aml_write()
683 		if (ret == -EAGAIN) {  in acpi_aml_write()
684 			if (file->f_flags & O_NONBLOCK)  in acpi_aml_write()
704 			count -= ret;  in acpi_aml_write()
746 		return -ENODEV;  in acpi_aml_init()