// 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;	struct kfd_process *process;	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,}; /* This helper locates the debugfs entry of a kfd process */static struct debugfs_proc_entry *kfd_debugfs_find_process_entry(struct kfd_process *p){	struct debugfs_proc_entry *entry; 	list_for_each_entry(entry, &procs, list) {		if (entry->process == p)			return entry;	} 	return NULL;} /* This helper creates pasid file of a kfd process under debugfs */static void kfd_debugfs_create_pasid_files(struct kfd_process *p,					   struct dentry *dir){	char name[MAX_DEBUGFS_FILENAME_LEN];	struct kfd_process_device *pdd;	int i; 	/* create pasid file for each GPU */	for (i = 0; i < p->n_pdds; i++) {		pdd = p->pdds[i];		snprintf(name, MAX_DEBUGFS_FILENAME_LEN, "pasid_%u", pdd->dev->id);		debugfs_create_file((const char *)name, S_IFREG | 0444,				    dir, pdd, &kfd_debugfs_pasid_fops);	}} int kfd_debugfs_add_process(struct kfd_process *p){	struct debugfs_proc_entry *primary_entry;	char name[MAX_DEBUGFS_FILENAME_LEN];	struct kfd_process *primary_process;	struct debugfs_proc_entry *entry;	int ret; 	entry = kzalloc_obj(*entry);	if (!entry)		return -ENOMEM; 	entry->process = p;	entry->pid = p->lead_thread->pid; 	if (p->context_id == KFD_CONTEXT_ID_PRIMARY) {		snprintf(name, MAX_DEBUGFS_FILENAME_LEN, "%d",			 (int)entry->pid);		entry->proc_dentry = debugfs_create_dir(name, debugfs_proc);	} else {		primary_process = kfd_lookup_process_by_mm(p->lead_thread->mm);		if (!primary_process) {			ret = -ESRCH;			goto err_free_entry;		} 		primary_entry = kfd_debugfs_find_process_entry(primary_process);		kfd_unref_process(primary_process);		if (!primary_entry) {			pr_warn("Failed to find the primary debugfs entry for pid %d\n",				entry->pid);			ret = -ENOENT;			goto err_free_entry;		} 		snprintf(name, MAX_DEBUGFS_FILENAME_LEN, "context_%u",			 p->context_id);		entry->proc_dentry = debugfs_create_dir(name,							primary_entry->proc_dentry);	} 	list_add(&entry->list, &procs);	kfd_debugfs_create_pasid_files(p, entry->proc_dentry); 	return 0; err_free_entry:	kfree(entry);	return ret;} /* This helper removes a debugfs entry and its sub-entries */static void kfd_debugfs_remove_entry(struct debugfs_proc_entry *entry){	debugfs_remove(entry->proc_dentry);	list_del(&entry->list);	kfree(entry);} void kfd_debugfs_remove_process(struct kfd_process *p){	struct debugfs_proc_entry *entry, *next; 	mutex_lock(&kfd_processes_mutex);	if (p->context_id == KFD_CONTEXT_ID_PRIMARY) {		/* remove entries of secondary contexts */		list_for_each_entry_safe(entry, next, &procs, list) {			if (entry->pid != p->lead_thread->pid || entry->process == p)				continue; 			kfd_debugfs_remove_entry(entry);		}	} 	list_for_each_entry_safe(entry, next, &procs, list) {		if (entry->process != p)			continue; 		kfd_debugfs_remove_entry(entry);	} 	mutex_unlock(&kfd_processes_mutex);}