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))
150 	 * The usage count is prepared to avoid race conditions between the  in acpi_aml_used()
209 		ret = -EFAULT;  in acpi_aml_lock_write()
213 		ret = -EAGAIN;  in acpi_aml_lock_write()
228 		ret = -EFAULT;  in acpi_aml_lock_read()
232 		ret = -EAGAIN;  in acpi_aml_lock_read()
262 	p = &crc->buf[crc->head];  in acpi_aml_write_kern()
267 	crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_write_kern()
283 	p = &crc->buf[crc->tail];  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
303 	int count = 0, size = 0;  in acpi_aml_write_log()  local
306 		return -ENODEV;  in acpi_aml_write_log()
308 		count = strlen(msg);  in acpi_aml_write_log()
309 	while (count > 0) {  in acpi_aml_write_log()
311 		ret = acpi_aml_write_kern(msg + size, count);  in acpi_aml_write_log()
312 		if (ret == -EAGAIN) {  in acpi_aml_write_log()
316 			 * We need to retry when the condition  in acpi_aml_write_log()
326 		count -= ret;  in acpi_aml_write_log()
332  * acpi_aml_read_cmd() - Capture debugger input
340 static ssize_t acpi_aml_read_cmd(char *msg, size_t count)  in acpi_aml_read_cmd()  argument
350 	while (count > 0) {  in acpi_aml_read_cmd()
356 		if (ret == -EAGAIN) {  in acpi_aml_read_cmd()
360 			 * We need to retry when the condition becomes  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()
584 	p = &crc->buf[crc->tail];  in acpi_aml_read_user()
587 		ret = -EFAULT;  in acpi_aml_read_user()
592 	crc->tail = (crc->tail + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_read_user()
600 			     size_t count, loff_t *ppos)  in acpi_aml_read()  argument
605 	if (!count)  in acpi_aml_read()
607 	if (!access_ok(buf, count))  in acpi_aml_read()
608 		return -EFAULT;  in acpi_aml_read()
610 	while (count > 0) {  in acpi_aml_read()
612 		ret = acpi_aml_read_user(buf + size, count);  in acpi_aml_read()
613 		if (ret == -EAGAIN) {  in acpi_aml_read()
614 			if (file->f_flags & O_NONBLOCK)  in acpi_aml_read()
620 				 * We need to retry when the condition  in acpi_aml_read()
634 			count -= ret;  in acpi_aml_read()
654 	p = &crc->buf[crc->head];  in acpi_aml_write_user()
657 		ret = -EFAULT;  in acpi_aml_write_user()
662 	crc->head = (crc->head + n) & (ACPI_AML_BUF_SIZE - 1);  in acpi_aml_write_user()
670 			      size_t count, loff_t *ppos)  in acpi_aml_write()  argument
675 	if (!count)  in acpi_aml_write()
677 	if (!access_ok(buf, count))  in acpi_aml_write()
678 		return -EFAULT;  in acpi_aml_write()
680 	while (count > 0) {  in acpi_aml_write()
682 		ret = acpi_aml_write_user(buf + size, count);  in acpi_aml_write()
683 		if (ret == -EAGAIN) {  in acpi_aml_write()
684 			if (file->f_flags & O_NONBLOCK)  in acpi_aml_write()
690 				 * We need to retry when the condition  in acpi_aml_write()
704 			count -= ret;  in acpi_aml_write()
727 	.poll		= acpi_aml_poll,
746 		return -ENODEV;  in acpi_aml_init()