1 // SPDX-License-Identifier: GPL-2.0-only
15 #include <linux/poll.h>
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))
157 	 * The usage count is prepared to avoid race conditions between the  in acpi_aml_used()
216 		ret = -EFAULT;  in acpi_aml_lock_write()
220 		ret = -EAGAIN;  in acpi_aml_lock_write()
235 		ret = -EFAULT;  in acpi_aml_lock_read()
239 		ret = -EAGAIN;  in acpi_aml_lock_read()
269 	p = &crc->buf[crc->head];  in acpi_aml_write_kern()
274 	crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_write_kern()
290 	p = &crc->buf[crc->tail];  in acpi_aml_readb_kern()
294 	crc->tail = (crc->tail + 1) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_readb_kern()
300  * acpi_aml_write_log() - Capture debugger output
310 	int count = 0, size = 0;  in acpi_aml_write_log()  local
313 		return -ENODEV;  in acpi_aml_write_log()
315 		count = strlen(msg);  in acpi_aml_write_log()
316 	while (count > 0) {  in acpi_aml_write_log()
318 		ret = acpi_aml_write_kern(msg + size, count);  in acpi_aml_write_log()
319 		if (ret == -EAGAIN) {  in acpi_aml_write_log()
323 			 * We need to retry when the condition  in acpi_aml_write_log()
333 		count -= ret;  in acpi_aml_write_log()
339  * acpi_aml_read_cmd() - Capture debugger input
347 static ssize_t acpi_aml_read_cmd(char *msg, size_t count)  in acpi_aml_read_cmd()  argument
357 	while (count > 0) {  in acpi_aml_read_cmd()
363 		if (ret == -EAGAIN) {  in acpi_aml_read_cmd()
367 			 * We need to retry when the condition becomes  in acpi_aml_read_cmd()
377 		count--;  in acpi_aml_read_cmd()
383 			*(msg + size - 1) = '\0';  in acpi_aml_read_cmd()
407 	acpi_aml_io.usages--;  in acpi_aml_thread()
418  * acpi_aml_create_thread() - Create AML debugger thread
460 		return -EINVAL;  in acpi_aml_wait_command_ready()
480 		ret = -EBUSY;  in acpi_aml_open()
483 	if ((file->f_flags & O_ACCMODE) != O_WRONLY) {  in acpi_aml_open()
489 			ret = -EBUSY;  in acpi_aml_open()
501 			ret = -ENODEV;  in acpi_aml_open()
513 			ret = -EINVAL;  in acpi_aml_open()
538 	acpi_aml_io.users--;  in acpi_aml_release()
591 	p = &crc->buf[crc->tail];  in acpi_aml_read_user()
594 		ret = -EFAULT;  in acpi_aml_read_user()
599 	crc->tail = (crc->tail + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_read_user()
607 			     size_t count, loff_t *ppos)  in acpi_aml_read()  argument
612 	if (!count)  in acpi_aml_read()
614 	if (!access_ok(buf, count))  in acpi_aml_read()
615 		return -EFAULT;  in acpi_aml_read()
617 	while (count > 0) {  in acpi_aml_read()
619 		ret = acpi_aml_read_user(buf + size, count);  in acpi_aml_read()
620 		if (ret == -EAGAIN) {  in acpi_aml_read()
621 			if (file->f_flags & O_NONBLOCK)  in acpi_aml_read()
627 				 * We need to retry when the condition  in acpi_aml_read()
641 			count -= ret;  in acpi_aml_read()
661 	p = &crc->buf[crc->head];  in acpi_aml_write_user()
664 		ret = -EFAULT;  in acpi_aml_write_user()
669 	crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_write_user()
677 			      size_t count, loff_t *ppos)  in acpi_aml_write()  argument
682 	if (!count)  in acpi_aml_write()
684 	if (!access_ok(buf, count))  in acpi_aml_write()
685 		return -EFAULT;  in acpi_aml_write()
687 	while (count > 0) {  in acpi_aml_write()
689 		ret = acpi_aml_write_user(buf + size, count);  in acpi_aml_write()
690 		if (ret == -EAGAIN) {  in acpi_aml_write()
691 			if (file->f_flags & O_NONBLOCK)  in acpi_aml_write()
697 				 * We need to retry when the condition  in acpi_aml_write()
711 			count -= ret;  in acpi_aml_write()
734 	.poll		= acpi_aml_poll,
753 		return -ENODEV;  in acpi_aml_init()