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https://github.com/torvalds/linux
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2aefbef041
This patch adds a sysfs interface to rproc allowing the firmware name and processor state to be changed dynamically. State was previously available in debugfs, and is replicated here. The firmware file allows retrieval of the running firmware name, and a new one to be specified at run time, so long as the remote processor has been stopped. Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
151 lines
3.5 KiB
C
151 lines
3.5 KiB
C
/*
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* Remote Processor Framework
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/remoteproc.h>
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#include "remoteproc_internal.h"
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#define to_rproc(d) container_of(d, struct rproc, dev)
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/* Expose the loaded / running firmware name via sysfs */
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static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct rproc *rproc = to_rproc(dev);
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return sprintf(buf, "%s\n", rproc->firmware);
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}
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/* Change firmware name via sysfs */
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static ssize_t firmware_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rproc *rproc = to_rproc(dev);
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char *p;
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int err, len = count;
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err = mutex_lock_interruptible(&rproc->lock);
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if (err) {
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dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, err);
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return -EINVAL;
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}
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if (rproc->state != RPROC_OFFLINE) {
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dev_err(dev, "can't change firmware while running\n");
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err = -EBUSY;
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goto out;
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}
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len = strcspn(buf, "\n");
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p = kstrndup(buf, len, GFP_KERNEL);
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if (!p) {
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err = -ENOMEM;
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goto out;
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}
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kfree(rproc->firmware);
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rproc->firmware = p;
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out:
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mutex_unlock(&rproc->lock);
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return err ? err : count;
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}
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static DEVICE_ATTR_RW(firmware);
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/*
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* A state-to-string lookup table, for exposing a human readable state
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* via sysfs. Always keep in sync with enum rproc_state
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*/
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static const char * const rproc_state_string[] = {
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[RPROC_OFFLINE] = "offline",
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[RPROC_SUSPENDED] = "suspended",
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[RPROC_RUNNING] = "running",
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[RPROC_CRASHED] = "crashed",
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[RPROC_LAST] = "invalid",
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};
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/* Expose the state of the remote processor via sysfs */
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static ssize_t state_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct rproc *rproc = to_rproc(dev);
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unsigned int state;
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state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state;
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return sprintf(buf, "%s\n", rproc_state_string[state]);
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}
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/* Change remote processor state via sysfs */
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static ssize_t state_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct rproc *rproc = to_rproc(dev);
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int ret = 0;
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if (sysfs_streq(buf, "start")) {
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if (rproc->state == RPROC_RUNNING)
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return -EBUSY;
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ret = rproc_boot(rproc);
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if (ret)
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dev_err(&rproc->dev, "Boot failed: %d\n", ret);
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} else if (sysfs_streq(buf, "stop")) {
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if (rproc->state != RPROC_RUNNING)
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return -EINVAL;
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rproc_shutdown(rproc);
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} else {
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dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
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ret = -EINVAL;
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}
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return ret ? ret : count;
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}
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static DEVICE_ATTR_RW(state);
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static struct attribute *rproc_attrs[] = {
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&dev_attr_firmware.attr,
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&dev_attr_state.attr,
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NULL
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};
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static const struct attribute_group rproc_devgroup = {
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.attrs = rproc_attrs
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};
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static const struct attribute_group *rproc_devgroups[] = {
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&rproc_devgroup,
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NULL
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};
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struct class rproc_class = {
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.name = "remoteproc",
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.dev_groups = rproc_devgroups,
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};
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int __init rproc_init_sysfs(void)
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{
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/* create remoteproc device class for sysfs */
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int err = class_register(&rproc_class);
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if (err)
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pr_err("remoteproc: unable to register class\n");
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return err;
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}
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void __exit rproc_exit_sysfs(void)
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{
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class_unregister(&rproc_class);
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}
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