drivers/gpu/drm/i915/i915_debugfs_params.c - linux - Git at Google

 // SPDX-License-Identifier: MIT
 /*
  * Copyright © 2019 Intel Corporation
  */

 #include <linux/kernel.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)
 {
 	int ret = 0;

 	if (intel_uc_uses_guc_submission(&i915->gt.uc))
 		ret = intel_guc_global_policies_update(&i915->gt.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);
 }

 static __always_inline void
 _i915_param_create_file(struct dentry *parent, const char *name,
 			const char *type, int mode, void *value)
 {
 	if (!mode)
 		return;

 	if (!__builtin_strcmp(type, "bool"))
 		debugfs_create_bool(name, mode, parent, value);
 	else if (!__builtin_strcmp(type, "int"))
 		i915_debugfs_create_int(name, mode, parent, value);
 	else if (!__builtin_strcmp(type, "unsigned int"))
 		i915_debugfs_create_uint(name, mode, parent, value);
 	else if (!__builtin_strcmp(type, "unsigned long"))
 		debugfs_create_ulong(name, mode, parent, value);
 	else if (!__builtin_strcmp(type, "char *"))
 		i915_debugfs_create_charp(name, mode, parent, value);
 	else
 		WARN(1, "no debugfs fops defined for param type %s (i915.%s)\n",
 		     type, name);
 }

 /* 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, #T, mode, &params->x);
 	I915_PARAMS_FOR_EACH(REGISTER);
 #undef REGISTER

 	return dir;
 }
	// SPDX-License-Identifier: MIT
	/*
	* Copyright © 2019 Intel Corporation
	*/

	#include <linux/kernel.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)
	{
	int ret = 0;

	if (intel_uc_uses_guc_submission(&i915->gt.uc))
	ret = intel_guc_global_policies_update(&i915->gt.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);
	}

	static __always_inline void
	_i915_param_create_file(struct dentry parent, const char name,
	const char type, int mode, void value)
	{
	if (!mode)
	return;

	if (!__builtin_strcmp(type, "bool"))
	debugfs_create_bool(name, mode, parent, value);
	else if (!__builtin_strcmp(type, "int"))
	i915_debugfs_create_int(name, mode, parent, value);
	else if (!__builtin_strcmp(type, "unsigned int"))
	i915_debugfs_create_uint(name, mode, parent, value);
	else if (!__builtin_strcmp(type, "unsigned long"))
	debugfs_create_ulong(name, mode, parent, value);
	else if (!__builtin_strcmp(type, "char *"))
	i915_debugfs_create_charp(name, mode, parent, value);
	else
	WARN(1, "no debugfs fops defined for param type %s (i915.%s)\n",
	type, name);
	}

	/* 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, #T, mode, &params->x);
	I915_PARAMS_FOR_EACH(REGISTER);
	#undef REGISTER

	return dir;
	}