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// SPDX-License-Identifier: GPL-2.0 OR MIT
/*
* Copyright 2016-2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include "kfd_priv.h"
static struct dentry *debugfs_root;
static struct dentry *debugfs_proc;
static struct list_head procs;
struct debugfs_proc_entry {
struct list_head list;
struct dentry *proc_dentry;
pid_t pid;
};
#define MAX_DEBUGFS_FILENAME_LEN 32
static int kfd_debugfs_open(struct inode *inode, struct file *file)
{
int (*show)(struct seq_file *, void *) = inode->i_private;
return single_open(file, show, NULL);
}
static int kfd_debugfs_hang_hws_read(struct seq_file *m, void *data)
{
seq_puts(m, "echo gpu_id > hang_hws\n");
return 0;
}
static ssize_t kfd_debugfs_hang_hws_write(struct file *file,
const char __user *user_buf, size_t size, loff_t *ppos)
{
struct kfd_node *dev;
char tmp[16];
uint32_t gpu_id;
int ret = -EINVAL;
memset(tmp, 0, 16);
if (size >= 16) {
pr_err("Invalid input for gpu id.\n");
goto out;
}
if (copy_from_user(tmp, user_buf, size)) {
ret = -EFAULT;
goto out;
}
if (kstrtoint(tmp, 10, &gpu_id)) {
pr_err("Invalid input for gpu id.\n");
goto out;
}
dev = kfd_device_by_id(gpu_id);
if (dev) {
kfd_debugfs_hang_hws(dev);
ret = size;
} else
pr_err("Cannot find device %d.\n", gpu_id);
out:
return ret;
}
static const struct file_operations kfd_debugfs_fops = {
.owner = THIS_MODULE,
.open = kfd_debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations kfd_debugfs_hang_hws_fops = {
.owner = THIS_MODULE,
.open = kfd_debugfs_open,
.read = seq_read,
.write = kfd_debugfs_hang_hws_write,
.llseek = seq_lseek,
.release = single_release,
};
void kfd_debugfs_init(void)
{
debugfs_root = debugfs_create_dir("kfd", NULL);
debugfs_proc = debugfs_create_dir("proc", debugfs_root);
INIT_LIST_HEAD(&procs);
debugfs_create_file("mqds", S_IFREG | 0444, debugfs_root,
kfd_debugfs_mqds_by_process, &kfd_debugfs_fops);
debugfs_create_file("hqds", S_IFREG | 0444, debugfs_root,
kfd_debugfs_hqds_by_device, &kfd_debugfs_fops);
debugfs_create_file("rls", S_IFREG | 0444, debugfs_root,
kfd_debugfs_rls_by_device, &kfd_debugfs_fops);
debugfs_create_file("hang_hws", S_IFREG | 0200, debugfs_root,
kfd_debugfs_hang_hws_read, &kfd_debugfs_hang_hws_fops);
debugfs_create_file("mem_limit", S_IFREG | 0200, debugfs_root,
kfd_debugfs_kfd_mem_limits, &kfd_debugfs_fops);
}
void kfd_debugfs_fini(void)
{
debugfs_remove_recursive(debugfs_proc);
debugfs_remove_recursive(debugfs_root);
}
static ssize_t kfd_debugfs_pasid_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
struct kfd_process_device *pdd = file_inode(file)->i_private;
char tmp[32];
int len;
len = snprintf(tmp, sizeof(tmp), "%u\n", pdd->pasid);
return simple_read_from_buffer(buf, count, ppos, tmp, len);
}
static const struct file_operations kfd_debugfs_pasid_fops = {
.owner = THIS_MODULE,
.read = kfd_debugfs_pasid_read,
};
void kfd_debugfs_add_process(struct kfd_process *p)
{
int i;
char name[MAX_DEBUGFS_FILENAME_LEN];
struct debugfs_proc_entry *entry;
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return;
list_add(&entry->list, &procs);
entry->pid = p->lead_thread->pid;
snprintf(name, MAX_DEBUGFS_FILENAME_LEN, "%d",
(int)entry->pid);
entry->proc_dentry = debugfs_create_dir(name, debugfs_proc);
/* Create debugfs files for each GPU:
* - proc/<pid>/pasid_<gpuid>
*/
for (i = 0; i < p->n_pdds; i++) {
struct kfd_process_device *pdd = p->pdds[i];
snprintf(name, MAX_DEBUGFS_FILENAME_LEN, "pasid_%u",
pdd->dev->id);
debugfs_create_file((const char *)name, S_IFREG | 0444,
entry->proc_dentry, pdd,
&kfd_debugfs_pasid_fops);
}
}
void kfd_debugfs_remove_process(struct kfd_process *p)
{
struct debugfs_proc_entry *entry, *next;
mutex_lock(&kfd_processes_mutex);
list_for_each_entry_safe(entry, next, &procs, list) {
if (entry->pid != p->lead_thread->pid)
continue;
debugfs_remove_recursive(entry->proc_dentry);
list_del(&entry->list);
kfree(entry);
}
mutex_unlock(&kfd_processes_mutex);
}
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