![Ohad Ben-Cohen](/assets/img/avatar_default.png)
For each registered rproc, maintain a generic remoteproc device whose parent is the low level platform-specific device (commonly a pdev, but it may certainly be any other type of device too). With this in hand, the resulting device hierarchy might then look like: omap-rproc.0 | - remoteproc0 <---- new ! | - virtio0 | - virtio1 | - rpmsg0 | - rpmsg1 | - rpmsg2 Where: - omap-rproc.0 is the low level device that's bound to the driver which invokes rproc_register() - remoteproc0 is the result of this patch, and will be added by the remoteproc framework when rproc_register() is invoked - virtio0 and virtio1 are vdevs that are registered by remoteproc when it realizes that they are supported by the firmware of the physical remote processor represented by omap-rproc.0 - rpmsg0, rpmsg1 and rpmsg2 are rpmsg devices that represent rpmsg channels, and are registerd by the rpmsg bus when it gets notified about their existence Technically, this patch: - changes 'struct rproc' to contain this generic remoteproc.x device - creates a new "remoteproc" type, to which this new generic remoteproc.x device belong to. - adds a super simple enumeration method for the indices of the remoteproc.x devices - updates all dev_* messaging to use the generic remoteproc.x device instead of the low level platform-specific device - updates all dma_* allocations to use the parent of remoteproc.x (where the platform-specific memory pools, most commonly CMA, are to be found) Adding this generic device has several merits: - we can now add remoteproc runtime PM support simply by hooking onto the new "remoteproc" type - all remoteproc log messages will now carry a common name prefix instead of having a platform-specific one - having a device as part of the rproc struct makes it possible to simplify refcounting (see subsequent patch) Thanks to Stephen Boyd <sboyd@codeaurora.org> for suggesting and discussing these ideas in one of the remoteproc review threads and to Fernando Guzman Lugo <fernando.lugo@ti.com> for trying them out with the (upcoming) runtime PM support for remoteproc. Cc: Fernando Guzman Lugo <fernando.lugo@ti.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
173 lines
4.4 KiB
C
173 lines
4.4 KiB
C
/*
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* Remote Processor Framework
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Mark Grosen <mgrosen@ti.com>
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* Brian Swetland <swetland@google.com>
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* Fernando Guzman Lugo <fernando.lugo@ti.com>
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* Suman Anna <s-anna@ti.com>
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* Robert Tivy <rtivy@ti.com>
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* Armando Uribe De Leon <x0095078@ti.com>
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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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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/kernel.h>
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#include <linux/debugfs.h>
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#include <linux/remoteproc.h>
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#include <linux/device.h>
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/* remoteproc debugfs parent dir */
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static struct dentry *rproc_dbg;
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/*
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* Some remote processors may support dumping trace logs into a shared
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* memory buffer. We expose this trace buffer using debugfs, so users
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* can easily tell what's going on remotely.
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*
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* We will most probably improve the rproc tracing facilities later on,
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* but this kind of lightweight and simple mechanism is always good to have,
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* as it provides very early tracing with little to no dependencies at all.
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*/
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static ssize_t rproc_trace_read(struct file *filp, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct rproc_mem_entry *trace = filp->private_data;
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int len = strnlen(trace->va, trace->len);
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return simple_read_from_buffer(userbuf, count, ppos, trace->va, len);
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}
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static const struct file_operations trace_rproc_ops = {
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.read = rproc_trace_read,
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.open = simple_open,
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.llseek = generic_file_llseek,
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};
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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 debugfs. 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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"offline",
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"suspended",
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"running",
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"crashed",
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"invalid",
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};
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/* expose the state of the remote processor via debugfs */
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static ssize_t rproc_state_read(struct file *filp, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct rproc *rproc = filp->private_data;
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unsigned int state;
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char buf[30];
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int i;
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state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state;
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i = snprintf(buf, 30, "%.28s (%d)\n", rproc_state_string[state],
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rproc->state);
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return simple_read_from_buffer(userbuf, count, ppos, buf, i);
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}
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static const struct file_operations rproc_state_ops = {
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.read = rproc_state_read,
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.open = simple_open,
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.llseek = generic_file_llseek,
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};
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/* expose the name of the remote processor via debugfs */
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static ssize_t rproc_name_read(struct file *filp, char __user *userbuf,
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size_t count, loff_t *ppos)
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{
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struct rproc *rproc = filp->private_data;
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/* need room for the name, a newline and a terminating null */
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char buf[100];
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int i;
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i = snprintf(buf, sizeof(buf), "%.98s\n", rproc->name);
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return simple_read_from_buffer(userbuf, count, ppos, buf, i);
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}
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static const struct file_operations rproc_name_ops = {
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.read = rproc_name_read,
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.open = simple_open,
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.llseek = generic_file_llseek,
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};
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void rproc_remove_trace_file(struct dentry *tfile)
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{
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debugfs_remove(tfile);
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}
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struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
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struct rproc_mem_entry *trace)
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{
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struct dentry *tfile;
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tfile = debugfs_create_file(name, 0400, rproc->dbg_dir,
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trace, &trace_rproc_ops);
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if (!tfile) {
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dev_err(&rproc->dev, "failed to create debugfs trace entry\n");
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return NULL;
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}
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return tfile;
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}
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void rproc_delete_debug_dir(struct rproc *rproc)
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{
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if (!rproc->dbg_dir)
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return;
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debugfs_remove_recursive(rproc->dbg_dir);
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}
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void rproc_create_debug_dir(struct rproc *rproc)
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{
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struct device *dev = &rproc->dev;
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if (!rproc_dbg)
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return;
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rproc->dbg_dir = debugfs_create_dir(dev_name(dev), rproc_dbg);
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if (!rproc->dbg_dir)
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return;
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debugfs_create_file("name", 0400, rproc->dbg_dir,
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rproc, &rproc_name_ops);
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debugfs_create_file("state", 0400, rproc->dbg_dir,
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rproc, &rproc_state_ops);
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}
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void __init rproc_init_debugfs(void)
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{
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if (debugfs_initialized()) {
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rproc_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
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if (!rproc_dbg)
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pr_err("can't create debugfs dir\n");
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}
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}
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void __exit rproc_exit_debugfs(void)
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{
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if (rproc_dbg)
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debugfs_remove(rproc_dbg);
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}
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