drivers/gpu/drm/imagination/pvr_params.c

   1 // SPDX-License-Identifier: GPL-2.0-only OR MIT
   2 /* Copyright (c) 2023 Imagination Technologies Ltd. */
   3
   4 #include "pvr_params.h"
   5
   6 #include <linux/cache.h>
   7 #include <linux/moduleparam.h>
   8
   9 static struct pvr_device_params pvr_device_param_defaults __read_mostly = {
  10 #define X(type_, name_, value_, desc_, ...) .name_ = (value_),
  11         PVR_DEVICE_PARAMS
  12 #undef X
  13 };
  14
  15 #define PVR_DEVICE_PARAM_NAMED(name_, type_, desc_) \
  16         module_param_named(name_, pvr_device_param_defaults.name_, type_, \
  17                            0400);                                         \
  18         MODULE_PARM_DESC(name_, desc_);
  19
  20 /*
  21  * This list of defines must contain every type specified in "pvr_params.h" as
  22  * ``PVR_PARAM_TYPE_*_C``.
  23  */
  24 #define PVR_PARAM_TYPE_X32_MODPARAM uint
  25
  26 #define X(type_, name_, value_, desc_, ...) \
  27         PVR_DEVICE_PARAM_NAMED(name_, PVR_PARAM_TYPE_##type_##_MODPARAM, desc_);
  28 PVR_DEVICE_PARAMS
  29 #undef X
  30
  31 int
  32 pvr_device_params_init(struct pvr_device_params *params)
  33 {
  34         /*
  35          * If heap-allocated parameters are added in the future (e.g.
  36          * modparam's charp type), they must be handled specially here (via
  37          * kstrdup() in the case of charp). Since that's not necessary yet,
  38          * a straight copy will do for now. This change will also require a
  39          * pvr_device_params_fini() function to free any heap-allocated copies.
  40          */
  41
  42         *params = pvr_device_param_defaults;
  43
  44         return 0;
  45 }
  46
  47 #if defined(CONFIG_DEBUG_FS)
  48 #include "pvr_device.h"
  49
  50 #include <linux/dcache.h>
  51 #include <linux/debugfs.h>
  52 #include <linux/export.h>
  53 #include <linux/fs.h>
  54 #include <linux/stddef.h>
  55
  56 /*
  57  * This list of defines must contain every type specified in "pvr_params.h" as
  58  * ``PVR_PARAM_TYPE_*_C``.
  59  */
  60 #define PVR_PARAM_TYPE_X32_FMT "0x%08llx"
  61
  62 #define X_SET(name_, mode_) X_SET_##mode_(name_)
  63 #define X_SET_DEF(name_, update_, mode_) X_SET_DEF_##mode_(name_, update_)
  64
  65 #define X_SET_RO(name_) NULL
  66 #define X_SET_RW(name_) __pvr_device_param_##name_##set
  67
  68 #define X_SET_DEF_RO(name_, update_)
  69 #define X_SET_DEF_RW(name_, update_)                                    \
  70         static int                                                      \
  71         X_SET_RW(name_)(void *data, u64 val)                            \
  72         {                                                               \
  73                 struct pvr_device *pvr_dev = data;                      \
  74                 /* This is not just (update_) to suppress -Waddress. */ \
  75                 if ((void *)(update_) != NULL)                          \
  76                         (update_)(pvr_dev, pvr_dev->params.name_, val); \
  77                 pvr_dev->params.name_ = val;                            \
  78                 return 0;                                               \
  79         }
  80
  81 #define X(type_, name_, value_, desc_, mode_, update_)                     \
  82         static int                                                         \
  83         __pvr_device_param_##name_##_get(void *data, u64 *val)             \
  84         {                                                                  \
  85                 struct pvr_device *pvr_dev = data;                         \
  86                 *val = pvr_dev->params.name_;                              \
  87                 return 0;                                                  \
  88         }                                                                  \
  89         X_SET_DEF(name_, update_, mode_)                                   \
  90         static int                                                         \
  91         __pvr_device_param_##name_##_open(struct inode *inode,             \
  92                                           struct file *file)               \
  93         {                                                                  \
  94                 __simple_attr_check_format(PVR_PARAM_TYPE_##type_##_FMT,   \
  95                                            0ull);                          \
  96                 return simple_attr_open(inode, file,                       \
  97                                         __pvr_device_param_##name_##_get,  \
  98                                         X_SET(name_, mode_),               \
  99                                         PVR_PARAM_TYPE_##type_##_FMT);     \
 100         }
 101 PVR_DEVICE_PARAMS
 102 #undef X
 103
 104 #undef X_SET
 105 #undef X_SET_RO
 106 #undef X_SET_RW
 107 #undef X_SET_DEF
 108 #undef X_SET_DEF_RO
 109 #undef X_SET_DEF_RW
 110
 111 static struct {
 112 #define X(type_, name_, value_, desc_, mode_, update_) \
 113         const struct file_operations name_;
 114         PVR_DEVICE_PARAMS
 115 #undef X
 116 } pvr_device_param_debugfs_fops = {
 117 #define X(type_, name_, value_, desc_, mode_, update_)     \
 118         .name_ = {                                         \
 119                 .owner = THIS_MODULE,                      \
 120                 .open = __pvr_device_param_##name_##_open, \
 121                 .release = simple_attr_release,            \
 122                 .read = simple_attr_read,                  \
 123                 .write = simple_attr_write,                \
 124                 .llseek = generic_file_llseek,             \
 125         },
 126         PVR_DEVICE_PARAMS
 127 #undef X
 128 };
 129
 130 void
 131 pvr_params_debugfs_init(struct pvr_device *pvr_dev, struct dentry *dir)
 132 {
 133 #define X_MODE(mode_) X_MODE_##mode_
 134 #define X_MODE_RO 0400
 135 #define X_MODE_RW 0600
 136
 137 #define X(type_, name_, value_, desc_, mode_, update_)             \
 138         debugfs_create_file(#name_, X_MODE(mode_), dir, pvr_dev,   \
 139                             &pvr_device_param_debugfs_fops.name_);
 140         PVR_DEVICE_PARAMS
 141 #undef X
 142
 143 #undef X_MODE
 144 #undef X_MODE_RO
 145 #undef X_MODE_RW
 146 }
 147 #endif