drivers/gpu/drm/i915/i915_params.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sub license, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the
  13  * next paragraph) shall be included in all copies or substantial portions
  14  * of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22  * IN THE SOFTWARE.
  23  */
  24
  25 #include <drm/drm_print.h>
  26
  27 #include "i915_params.h"
  28 #include "i915_drv.h"
  29
  30 #define i915_param_named(name, T, perm, desc) \
  31         module_param_named(name, i915_modparams.name, T, perm); \
  32         MODULE_PARM_DESC(name, desc)
  33 #define i915_param_named_unsafe(name, T, perm, desc) \
  34         module_param_named_unsafe(name, i915_modparams.name, T, perm); \
  35         MODULE_PARM_DESC(name, desc)
  36
  37 struct i915_params i915_modparams __read_mostly = {
  38 #define MEMBER(T, member, value) .member = (value),
  39         I915_PARAMS_FOR_EACH(MEMBER)
  40 #undef MEMBER
  41 };
  42
  43 i915_param_named(modeset, int, 0400,
  44         "Use kernel modesetting [KMS] (0=disable, "
  45         "1=on, -1=force vga console preference [default])");
  46
  47 i915_param_named_unsafe(enable_dc, int, 0400,
  48         "Enable power-saving display C-states. "
  49         "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6)");
  50
  51 i915_param_named_unsafe(enable_fbc, int, 0600,
  52         "Enable frame buffer compression for power savings "
  53         "(default: -1 (use per-chip default))");
  54
  55 i915_param_named_unsafe(lvds_channel_mode, int, 0400,
  56          "Specify LVDS channel mode "
  57          "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
  58
  59 i915_param_named_unsafe(panel_use_ssc, int, 0600,
  60         "Use Spread Spectrum Clock with panels [LVDS/eDP] "
  61         "(default: auto from VBT)");
  62
  63 i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400,
  64         "Override/Ignore selection of SDVO panel mode in the VBT "
  65         "(-2=ignore, -1=auto [default], index in VBT BIOS table)");
  66
  67 i915_param_named_unsafe(reset, int, 0600,
  68         "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])");
  69
  70 i915_param_named_unsafe(vbt_firmware, charp, 0400,
  71         "Load VBT from specified file under /lib/firmware");
  72
  73 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
  74 i915_param_named(error_capture, bool, 0600,
  75         "Record the GPU state following a hang. "
  76         "This information in /sys/class/drm/card<N>/error is vital for "
  77         "triaging and debugging hangs.");
  78 #endif
  79
  80 i915_param_named_unsafe(enable_hangcheck, bool, 0600,
  81         "Periodically check GPU activity for detecting hangs. "
  82         "WARNING: Disabling this can cause system wide hangs. "
  83         "(default: true)");
  84
  85 i915_param_named_unsafe(enable_psr, int, 0600,
  86         "Enable PSR "
  87         "(0=disabled, 1=enabled) "
  88         "Default: -1 (use per-chip default)");
  89
  90 i915_param_named_unsafe(force_probe, charp, 0400,
  91         "Force probe the driver for specified devices. "
  92         "See CONFIG_DRM_I915_FORCE_PROBE for details.");
  93
  94 i915_param_named_unsafe(alpha_support, bool, 0400,
  95         "Deprecated. See i915.force_probe.");
  96
  97 i915_param_named_unsafe(disable_power_well, int, 0400,
  98         "Disable display power wells when possible "
  99         "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
 100
 101 i915_param_named_unsafe(enable_ips, int, 0600, "Enable IPS (default: true)");
 102
 103 i915_param_named(fastboot, int, 0600,
 104         "Try to skip unnecessary mode sets at boot time "
 105         "(0=disabled, 1=enabled) "
 106         "Default: -1 (use per-chip default)");
 107
 108 i915_param_named_unsafe(prefault_disable, bool, 0600,
 109         "Disable page prefaulting for pread/pwrite/reloc (default:false). "
 110         "For developers only.");
 111
 112 i915_param_named_unsafe(load_detect_test, bool, 0600,
 113         "Force-enable the VGA load detect code for testing (default:false). "
 114         "For developers only.");
 115
 116 i915_param_named_unsafe(force_reset_modeset_test, bool, 0600,
 117         "Force a modeset during gpu reset for testing (default:false). "
 118         "For developers only.");
 119
 120 i915_param_named_unsafe(invert_brightness, int, 0600,
 121         "Invert backlight brightness "
 122         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 123         "report PCI device ID, subsystem vendor and subsystem device ID "
 124         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 125         "It will then be included in an upcoming module version.");
 126
 127 i915_param_named(disable_display, bool, 0400,
 128         "Disable display (default: false)");
 129
 130 i915_param_named(mmio_debug, int, 0600,
 131         "Enable the MMIO debug code for the first N failures (default: off). "
 132         "This may negatively affect performance.");
 133
 134 i915_param_named(verbose_state_checks, bool, 0600,
 135         "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
 136
 137 i915_param_named_unsafe(nuclear_pageflip, bool, 0400,
 138         "Force enable atomic functionality on platforms that don't have full support yet.");
 139
 140 /* WA to get away with the default setting in VBT for early platforms.Will be removed */
 141 i915_param_named_unsafe(edp_vswing, int, 0400,
 142         "Ignore/Override vswing pre-emph table selection from VBT "
 143         "(0=use value from vbt [default], 1=low power swing(200mV),"
 144         "2=default swing(400mV))");
 145
 146 i915_param_named_unsafe(enable_guc, int, 0400,
 147         "Enable GuC load for GuC submission and/or HuC load. "
 148         "Required functionality can be selected using bitmask values. "
 149         "(-1=auto, 0=disable [default], 1=GuC submission, 2=HuC load)");
 150
 151 i915_param_named(guc_log_level, int, 0400,
 152         "GuC firmware logging level. Requires GuC to be loaded. "
 153         "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)");
 154
 155 i915_param_named_unsafe(guc_firmware_path, charp, 0400,
 156         "GuC firmware path to use instead of the default one");
 157
 158 i915_param_named_unsafe(huc_firmware_path, charp, 0400,
 159         "HuC firmware path to use instead of the default one");
 160
 161 i915_param_named_unsafe(dmc_firmware_path, charp, 0400,
 162         "DMC firmware path to use instead of the default one");
 163
 164 i915_param_named_unsafe(enable_dp_mst, bool, 0600,
 165         "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
 166
 167 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
 168 i915_param_named_unsafe(inject_load_failure, uint, 0400,
 169         "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
 170 #endif
 171
 172 i915_param_named(enable_dpcd_backlight, bool, 0600,
 173         "Enable support for DPCD backlight control (default:false)");
 174
 175 #if IS_ENABLED(CONFIG_DRM_I915_GVT)
 176 i915_param_named(enable_gvt, bool, 0400,
 177         "Enable support for Intel GVT-g graphics virtualization host support(default:false)");
 178 #endif
 179
 180 static __always_inline void _print_param(struct drm_printer *p,
 181                                          const char *name,
 182                                          const char *type,
 183                                          const void *x)
 184 {
 185         if (!__builtin_strcmp(type, "bool"))
 186                 drm_printf(p, "i915.%s=%s\n", name, yesno(*(const bool *)x));
 187         else if (!__builtin_strcmp(type, "int"))
 188                 drm_printf(p, "i915.%s=%d\n", name, *(const int *)x);
 189         else if (!__builtin_strcmp(type, "unsigned int"))
 190                 drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x);
 191         else if (!__builtin_strcmp(type, "char *"))
 192                 drm_printf(p, "i915.%s=%s\n", name, *(const char **)x);
 193         else
 194                 WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n",
 195                           type, name);
 196 }
 197
 198 /**
 199  * i915_params_dump - dump i915 modparams
 200  * @params: i915 modparams
 201  * @p: the &drm_printer
 202  *
 203  * Pretty printer for i915 modparams.
 204  */
 205 void i915_params_dump(const struct i915_params *params, struct drm_printer *p)
 206 {
 207 #define PRINT(T, x, ...) _print_param(p, #x, #T, &params->x);
 208         I915_PARAMS_FOR_EACH(PRINT);
 209 #undef PRINT
 210 }
 211
 212 static __always_inline void dup_param(const char *type, void *x)
 213 {
 214         if (!__builtin_strcmp(type, "char *"))
 215                 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
 216 }
 217
 218 void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
 219 {
 220         *dest = *src;
 221 #define DUP(T, x, ...) dup_param(#T, &dest->x);
 222         I915_PARAMS_FOR_EACH(DUP);
 223 #undef DUP
 224 }
 225
 226 static __always_inline void free_param(const char *type, void *x)
 227 {
 228         if (!__builtin_strcmp(type, "char *")) {
 229                 kfree(*(void **)x);
 230                 *(void **)x = NULL;
 231         }
 232 }
 233
 234 /* free the allocated members, *not* the passed in params itself */
 235 void i915_params_free(struct i915_params *params)
 236 {
 237 #define FREE(T, x, ...) free_param(#T, &params->x);
 238         I915_PARAMS_FOR_EACH(FREE);
 239 #undef FREE
 240 }