6ed756aa01
This patch adds a sysfs interface that provides the name of the remote processor to userspace. This allows the userspace to identify a remote processor as the remoteproc devices themselves are created based on probe order and can change from one boot to another or at runtime. The name is made available in debugfs originally, and is being retained for now. This can be cleaned up after couple of releases once users get familiar with the new interface. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Remote Processor Framework
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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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if (!len) {
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dev_err(dev, "can't provide a NULL firmware\n");
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err = -EINVAL;
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goto out;
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}
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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_DELETED] = "deleted",
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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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/* Expose the name of the remote processor via sysfs */
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static ssize_t name_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->name);
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}
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static DEVICE_ATTR_RO(name);
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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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&dev_attr_name.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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