// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include <linux/kernel.h>
#include <linux/debugfs.h>
#include "i915_debugfs_params.h"
#include "gt/intel_gt.h"
#include "gt/uc/intel_guc.h"
#include "i915_drv.h"
#include "i915_params.h"
#define MATCH_DEBUGFS_NODE_NAME(_file, _name) \
(strcmp((_file)->f_path.dentry->d_name.name, (_name)) == 0)
#define GET_I915(i915, name, ptr) \
do { \
struct i915_params *params; \
params = container_of(((void *)(ptr)), typeof(*params), name); \
(i915) = container_of(params, typeof(*(i915)), params); \
} while (0)
/* int param */
static int i915_param_int_show(struct seq_file *m, void *data)
{
int *value = m->private;
seq_printf(m, "%d\n", *value);
return 0;
}
static int i915_param_int_open(struct inode *inode, struct file *file)
{
return single_open(file, i915_param_int_show, inode->i_private);
}
static int notify_guc(struct drm_i915_private *i915)
{
struct intel_gt *gt;
int i, ret = 0;
for_each_gt(gt, i915, i) {
if (intel_uc_uses_guc_submission(>->uc))
ret = intel_guc_global_policies_update(>->uc.guc);
}
return ret;
}
static ssize_t i915_param_int_write(struct file *file,
const char __user *ubuf, size_t len,
loff_t *offp)
{
struct seq_file *m = file->private_data;
int *value = m->private;
int ret;
ret = kstrtoint_from_user(ubuf, len, 0, value);
if (ret) {
/* support boolean values too */
bool b;
ret = kstrtobool_from_user(ubuf, len, &b);
if (!ret)
*value = b;
}
return ret ?: len;
}
static const struct file_operations i915_param_int_fops = {
.owner = THIS_MODULE,
.open = i915_param_int_open,
.read = seq_read,
.write = i915_param_int_write,
.llseek = default_llseek,
.release = single_release,
};
static const struct file_operations i915_param_int_fops_ro = {
.owner = THIS_MODULE,
.open = i915_param_int_open,
.read = seq_read,
.llseek = default_llseek,
.release = single_release,
};
/* unsigned int param */
static int i915_param_uint_show(struct seq_file *m, void *data)
{
unsigned int *value = m->private;
seq_printf(m, "%u\n", *value);
return 0;
}
static int i915_param_uint_open(struct inode *inode, struct file *file)
{
return single_open(file, i915_param_uint_show, inode->i_private);
}
static ssize_t i915_param_uint_write(struct file *file,
const char __user *ubuf, size_t len,
loff_t *offp)
{
struct drm_i915_private *i915;
struct seq_file *m = file->private_data;
unsigned int *value = m->private;
unsigned int old = *value;
int ret;
ret = kstrtouint_from_user(ubuf, len, 0, value);
if (ret) {
/* support boolean values too */
bool b;
ret = kstrtobool_from_user(ubuf, len, &b);
if (!ret)
*value = b;
}
if (!ret && MATCH_DEBUGFS_NODE_NAME(file, "reset")) {
GET_I915(i915, reset, value);
ret = notify_guc(i915);
if (ret)
*value = old;
}
return ret ?: len;
}
static const struct file_operations i915_param_uint_fops = {
.owner = THIS_MODULE,
.open = i915_param_uint_open,
.read = seq_read,
.write = i915_param_uint_write,
.llseek = default_llseek,
.release = single_release,
};
static const struct file_operations i915_param_uint_fops_ro = {
.owner = THIS_MODULE,
.open = i915_param_uint_open,
.read = seq_read,
.llseek = default_llseek,
.release = single_release,
};
/* char * param */
static int i915_param_charp_show(struct seq_file *m, void *data)
{
const char **s = m->private;
seq_printf(m, "%s\n", *s);
return 0;
}
static int i915_param_charp_open(struct inode *inode, struct file *file)
{
return single_open(file, i915_param_charp_show, inode->i_private);
}
static ssize_t i915_param_charp_write(struct file *file,
const char __user *ubuf, size_t len,
loff_t *offp)
{
struct seq_file *m = file->private_data;
char **s = m->private;
char *new, *old;
old = *s;
new = strndup_user(ubuf, PAGE_SIZE);
if (IS_ERR(new)) {
len = PTR_ERR(new);
goto out;
}
*s = new;
kfree(old);
out:
return len;
}
static const struct file_operations i915_param_charp_fops = {
.owner = THIS_MODULE,
.open = i915_param_charp_open,
.read = seq_read,
.write = i915_param_charp_write,
.llseek = default_llseek,
.release = single_release,
};
static const struct file_operations i915_param_charp_fops_ro = {
.owner = THIS_MODULE,
.open = i915_param_charp_open,
.read = seq_read,
.llseek = default_llseek,
.release = single_release,
};
#define RO(mode) (((mode) & 0222) == 0)
static struct dentry *
i915_debugfs_create_int(const char *name, umode_t mode,
struct dentry *parent, int *value)
{
return debugfs_create_file_unsafe(name, mode, parent, value,
RO(mode) ? &i915_param_int_fops_ro :
&i915_param_int_fops);
}
static struct dentry *
i915_debugfs_create_uint(const char *name, umode_t mode,
struct dentry *parent, unsigned int *value)
{
return debugfs_create_file_unsafe(name, mode, parent, value,
RO(mode) ? &i915_param_uint_fops_ro :
&i915_param_uint_fops);
}
static struct dentry *
i915_debugfs_create_charp(const char *name, umode_t mode,
struct dentry *parent, char **value)
{
return debugfs_create_file(name, mode, parent, value,
RO(mode) ? &i915_param_charp_fops_ro :
&i915_param_charp_fops);
}
#define _i915_param_create_file(parent, name, mode, valp) \
do { \
if (mode) \
_Generic(valp, \
bool *: debugfs_create_bool, \
int *: i915_debugfs_create_int, \
unsigned int *: i915_debugfs_create_uint, \
unsigned long *: debugfs_create_ulong, \
char **: i915_debugfs_create_charp)(name, mode, parent, valp); \
} while(0)
/* add a subdirectory with files for each i915 param */
struct dentry *i915_debugfs_params(struct drm_i915_private *i915)
{
struct drm_minor *minor = i915->drm.primary;
struct i915_params *params = &i915->params;
struct dentry *dir;
dir = debugfs_create_dir("i915_params", minor->debugfs_root);
if (IS_ERR(dir))
return dir;
/*
* Note: We could create files for params needing special handling
* here. Set mode in params to 0 to skip the generic create file, or
* just let the generic create file fail silently with -EEXIST.
*/
#define REGISTER(T, x, unused, mode, ...) _i915_param_create_file(dir, #x, mode, ¶ms->x);
I915_PARAMS_FOR_EACH(REGISTER);
#undef REGISTER
return dir;
}
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