drivers/gpu/drm/i915/i915_debugfs_params.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2019 Intel Corporation
   4  */
   5
   6 #include <linux/kernel.h>
   7
   8 #include "i915_debugfs_params.h"
   9 #include "gt/intel_gt.h"
  10 #include "gt/uc/intel_guc.h"
  11 #include "i915_drv.h"
  12 #include "i915_params.h"
  13
  14 #define MATCH_DEBUGFS_NODE_NAME(_file, _name) \
  15         (strcmp((_file)->f_path.dentry->d_name.name, (_name)) == 0)
  16
  17 #define GET_I915(i915, name, ptr)       \
  18         do {    \
  19                 struct i915_params *params;     \
  20                 params = container_of(((void *)(ptr)), typeof(*params), name);  \
  21                 (i915) = container_of(params, typeof(*(i915)), params); \
  22         } while (0)
  23
  24 /* int param */
  25 static int i915_param_int_show(struct seq_file *m, void *data)
  26 {
  27         int *value = m->private;
  28
  29         seq_printf(m, "%d\n", *value);
  30
  31         return 0;
  32 }
  33
  34 static int i915_param_int_open(struct inode *inode, struct file *file)
  35 {
  36         return single_open(file, i915_param_int_show, inode->i_private);
  37 }
  38
  39 static int notify_guc(struct drm_i915_private *i915)
  40 {
  41         int ret = 0;
  42
  43         if (intel_uc_uses_guc_submission(&to_gt(i915)->uc))
  44                 ret = intel_guc_global_policies_update(&to_gt(i915)->uc.guc);
  45
  46         return ret;
  47 }
  48
  49 static ssize_t i915_param_int_write(struct file *file,
  50                                     const char __user *ubuf, size_t len,
  51                                     loff_t *offp)
  52 {
  53         struct seq_file *m = file->private_data;
  54         int *value = m->private;
  55         int ret;
  56
  57         ret = kstrtoint_from_user(ubuf, len, 0, value);
  58         if (ret) {
  59                 /* support boolean values too */
  60                 bool b;
  61
  62                 ret = kstrtobool_from_user(ubuf, len, &b);
  63                 if (!ret)
  64                         *value = b;
  65         }
  66
  67         return ret ?: len;
  68 }
  69
  70 static const struct file_operations i915_param_int_fops = {
  71         .owner = THIS_MODULE,
  72         .open = i915_param_int_open,
  73         .read = seq_read,
  74         .write = i915_param_int_write,
  75         .llseek = default_llseek,
  76         .release = single_release,
  77 };
  78
  79 static const struct file_operations i915_param_int_fops_ro = {
  80         .owner = THIS_MODULE,
  81         .open = i915_param_int_open,
  82         .read = seq_read,
  83         .llseek = default_llseek,
  84         .release = single_release,
  85 };
  86
  87 /* unsigned int param */
  88 static int i915_param_uint_show(struct seq_file *m, void *data)
  89 {
  90         unsigned int *value = m->private;
  91
  92         seq_printf(m, "%u\n", *value);
  93
  94         return 0;
  95 }
  96
  97 static int i915_param_uint_open(struct inode *inode, struct file *file)
  98 {
  99         return single_open(file, i915_param_uint_show, inode->i_private);
 100 }
 101
 102 static ssize_t i915_param_uint_write(struct file *file,
 103                                      const char __user *ubuf, size_t len,
 104                                      loff_t *offp)
 105 {
 106         struct drm_i915_private *i915;
 107         struct seq_file *m = file->private_data;
 108         unsigned int *value = m->private;
 109         unsigned int old = *value;
 110         int ret;
 111
 112         ret = kstrtouint_from_user(ubuf, len, 0, value);
 113         if (ret) {
 114                 /* support boolean values too */
 115                 bool b;
 116
 117                 ret = kstrtobool_from_user(ubuf, len, &b);
 118                 if (!ret)
 119                         *value = b;
 120         }
 121
 122         if (!ret && MATCH_DEBUGFS_NODE_NAME(file, "reset")) {
 123                 GET_I915(i915, reset, value);
 124
 125                 ret = notify_guc(i915);
 126                 if (ret)
 127                         *value = old;
 128         }
 129
 130         return ret ?: len;
 131 }
 132
 133 static const struct file_operations i915_param_uint_fops = {
 134         .owner = THIS_MODULE,
 135         .open = i915_param_uint_open,
 136         .read = seq_read,
 137         .write = i915_param_uint_write,
 138         .llseek = default_llseek,
 139         .release = single_release,
 140 };
 141
 142 static const struct file_operations i915_param_uint_fops_ro = {
 143         .owner = THIS_MODULE,
 144         .open = i915_param_uint_open,
 145         .read = seq_read,
 146         .llseek = default_llseek,
 147         .release = single_release,
 148 };
 149
 150 /* char * param */
 151 static int i915_param_charp_show(struct seq_file *m, void *data)
 152 {
 153         const char **s = m->private;
 154
 155         seq_printf(m, "%s\n", *s);
 156
 157         return 0;
 158 }
 159
 160 static int i915_param_charp_open(struct inode *inode, struct file *file)
 161 {
 162         return single_open(file, i915_param_charp_show, inode->i_private);
 163 }
 164
 165 static ssize_t i915_param_charp_write(struct file *file,
 166                                       const char __user *ubuf, size_t len,
 167                                       loff_t *offp)
 168 {
 169         struct seq_file *m = file->private_data;
 170         char **s = m->private;
 171         char *new, *old;
 172
 173         old = *s;
 174         new = strndup_user(ubuf, PAGE_SIZE);
 175         if (IS_ERR(new)) {
 176                 len = PTR_ERR(new);
 177                 goto out;
 178         }
 179
 180         *s = new;
 181
 182         kfree(old);
 183 out:
 184         return len;
 185 }
 186
 187 static const struct file_operations i915_param_charp_fops = {
 188         .owner = THIS_MODULE,
 189         .open = i915_param_charp_open,
 190         .read = seq_read,
 191         .write = i915_param_charp_write,
 192         .llseek = default_llseek,
 193         .release = single_release,
 194 };
 195
 196 static const struct file_operations i915_param_charp_fops_ro = {
 197         .owner = THIS_MODULE,
 198         .open = i915_param_charp_open,
 199         .read = seq_read,
 200         .llseek = default_llseek,
 201         .release = single_release,
 202 };
 203
 204 #define RO(mode) (((mode) & 0222) == 0)
 205
 206 static struct dentry *
 207 i915_debugfs_create_int(const char *name, umode_t mode,
 208                         struct dentry *parent, int *value)
 209 {
 210         return debugfs_create_file_unsafe(name, mode, parent, value,
 211                                           RO(mode) ? &i915_param_int_fops_ro :
 212                                           &i915_param_int_fops);
 213 }
 214
 215 static struct dentry *
 216 i915_debugfs_create_uint(const char *name, umode_t mode,
 217                          struct dentry *parent, unsigned int *value)
 218 {
 219         return debugfs_create_file_unsafe(name, mode, parent, value,
 220                                           RO(mode) ? &i915_param_uint_fops_ro :
 221                                           &i915_param_uint_fops);
 222 }
 223
 224 static struct dentry *
 225 i915_debugfs_create_charp(const char *name, umode_t mode,
 226                           struct dentry *parent, char **value)
 227 {
 228         return debugfs_create_file(name, mode, parent, value,
 229                                    RO(mode) ? &i915_param_charp_fops_ro :
 230                                    &i915_param_charp_fops);
 231 }
 232
 233 #define _i915_param_create_file(parent, name, mode, valp)               \
 234         do {                                                            \
 235                 if (mode)                                               \
 236                         _Generic(valp,                                  \
 237                                  bool *: debugfs_create_bool,           \
 238                                  int *: i915_debugfs_create_int,        \
 239                                  unsigned int *: i915_debugfs_create_uint, \
 240                                  unsigned long *: debugfs_create_ulong, \
 241                                  char **: i915_debugfs_create_charp)(name, mode, parent, valp); \
 242         } while(0)
 243
 244 /* add a subdirectory with files for each i915 param */
 245 struct dentry *i915_debugfs_params(struct drm_i915_private *i915)
 246 {
 247         struct drm_minor *minor = i915->drm.primary;
 248         struct i915_params *params = &i915->params;
 249         struct dentry *dir;
 250
 251         dir = debugfs_create_dir("i915_params", minor->debugfs_root);
 252         if (IS_ERR(dir))
 253                 return dir;
 254
 255         /*
 256          * Note: We could create files for params needing special handling
 257          * here. Set mode in params to 0 to skip the generic create file, or
 258          * just let the generic create file fail silently with -EEXIST.
 259          */
 260
 261 #define REGISTER(T, x, unused, mode, ...) _i915_param_create_file(dir, #x, mode, &params->x);
 262         I915_PARAMS_FOR_EACH(REGISTER);
 263 #undef REGISTER
 264
 265         return dir;
 266 }