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 /*
  44  * Note: As a rule, keep module parameter sysfs permissions read-only
  45  * 0400. Runtime changes are only supported through i915 debugfs.
  46  *
  47  * For any exceptions requiring write access and runtime changes through module
  48  * parameter sysfs, prevent debugfs file creation by setting the parameter's
  49  * debugfs mode to 0.
  50  */
  51
  52 i915_param_named(modeset, int, 0400,
  53         "Use kernel modesetting [KMS] (0=disable, "
  54         "1=on, -1=force vga console preference [default])");
  55
  56 i915_param_named_unsafe(enable_dc, int, 0400,
  57         "Enable power-saving display C-states. "
  58         "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; "
  59         "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)");
  60
  61 i915_param_named_unsafe(enable_fbc, int, 0400,
  62         "Enable frame buffer compression for power savings "
  63         "(default: -1 (use per-chip default))");
  64
  65 i915_param_named_unsafe(lvds_channel_mode, int, 0400,
  66          "Specify LVDS channel mode "
  67          "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
  68
  69 i915_param_named_unsafe(panel_use_ssc, int, 0400,
  70         "Use Spread Spectrum Clock with panels [LVDS/eDP] "
  71         "(default: auto from VBT)");
  72
  73 i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400,
  74         "Override/Ignore selection of SDVO panel mode in the VBT "
  75         "(-2=ignore, -1=auto [default], index in VBT BIOS table)");
  76
  77 i915_param_named_unsafe(reset, uint, 0400,
  78         "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])");
  79
  80 i915_param_named_unsafe(vbt_firmware, charp, 0400,
  81         "Load VBT from specified file under /lib/firmware");
  82
  83 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
  84 i915_param_named(error_capture, bool, 0400,
  85         "Record the GPU state following a hang. "
  86         "This information in /sys/class/drm/card<N>/error is vital for "
  87         "triaging and debugging hangs.");
  88 #endif
  89
  90 i915_param_named_unsafe(enable_hangcheck, bool, 0400,
  91         "Periodically check GPU activity for detecting hangs. "
  92         "WARNING: Disabling this can cause system wide hangs. "
  93         "(default: true)");
  94
  95 i915_param_named_unsafe(enable_psr, int, 0400,
  96         "Enable PSR "
  97         "(0=disabled, 1=enabled) "
  98         "Default: -1 (use per-chip default)");
  99
 100 i915_param_named(psr_safest_params, bool, 0400,
 101         "Replace PSR VBT parameters by the safest and not optimal ones. This "
 102         "is helpful to detect if PSR issues are related to bad values set in "
 103         " VBT. (0=use VBT parameters, 1=use safest parameters)");
 104
 105 i915_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400,
 106         "Enable PSR2 selective fetch "
 107         "(0=disabled, 1=enabled) "
 108         "Default: 0");
 109
 110 i915_param_named_unsafe(force_probe, charp, 0400,
 111         "Force probe the driver for specified devices. "
 112         "See CONFIG_DRM_I915_FORCE_PROBE for details.");
 113
 114 i915_param_named_unsafe(disable_power_well, int, 0400,
 115         "Disable display power wells when possible "
 116         "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
 117
 118 i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)");
 119
 120 i915_param_named(fastboot, int, 0400,
 121         "Try to skip unnecessary mode sets at boot time "
 122         "(0=disabled, 1=enabled) "
 123         "Default: -1 (use per-chip default)");
 124
 125 i915_param_named_unsafe(load_detect_test, bool, 0400,
 126         "Force-enable the VGA load detect code for testing (default:false). "
 127         "For developers only.");
 128
 129 i915_param_named_unsafe(force_reset_modeset_test, bool, 0400,
 130         "Force a modeset during gpu reset for testing (default:false). "
 131         "For developers only.");
 132
 133 i915_param_named_unsafe(invert_brightness, int, 0400,
 134         "Invert backlight brightness "
 135         "(-1 force normal, 0 machine defaults, 1 force inversion), please "
 136         "report PCI device ID, subsystem vendor and subsystem device ID "
 137         "to dri-devel@lists.freedesktop.org, if your machine needs it. "
 138         "It will then be included in an upcoming module version.");
 139
 140 i915_param_named(disable_display, bool, 0400,
 141         "Disable display (default: false)");
 142
 143 i915_param_named(mmio_debug, int, 0400,
 144         "Enable the MMIO debug code for the first N failures (default: off). "
 145         "This may negatively affect performance.");
 146
 147 /* Special case writable file */
 148 i915_param_named(verbose_state_checks, bool, 0600,
 149         "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
 150
 151 i915_param_named_unsafe(nuclear_pageflip, bool, 0400,
 152         "Force enable atomic functionality on platforms that don't have full support yet.");
 153
 154 /* WA to get away with the default setting in VBT for early platforms.Will be removed */
 155 i915_param_named_unsafe(edp_vswing, int, 0400,
 156         "Ignore/Override vswing pre-emph table selection from VBT "
 157         "(0=use value from vbt [default], 1=low power swing(200mV),"
 158         "2=default swing(400mV))");
 159
 160 i915_param_named_unsafe(enable_guc, int, 0400,
 161         "Enable GuC load for GuC submission and/or HuC load. "
 162         "Required functionality can be selected using bitmask values. "
 163         "(-1=auto, 0=disable [default], 1=GuC submission, 2=HuC load)");
 164
 165 i915_param_named(guc_log_level, int, 0400,
 166         "GuC firmware logging level. Requires GuC to be loaded. "
 167         "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)");
 168
 169 i915_param_named_unsafe(guc_firmware_path, charp, 0400,
 170         "GuC firmware path to use instead of the default one");
 171
 172 i915_param_named_unsafe(huc_firmware_path, charp, 0400,
 173         "HuC firmware path to use instead of the default one");
 174
 175 i915_param_named_unsafe(dmc_firmware_path, charp, 0400,
 176         "DMC firmware path to use instead of the default one");
 177
 178 i915_param_named_unsafe(enable_dp_mst, bool, 0400,
 179         "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
 180
 181 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
 182 i915_param_named_unsafe(inject_probe_failure, uint, 0400,
 183         "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
 184 #endif
 185
 186 i915_param_named(enable_dpcd_backlight, int, 0400,
 187         "Enable support for DPCD backlight control"
 188         "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enabled)");
 189
 190 #if IS_ENABLED(CONFIG_DRM_I915_GVT)
 191 i915_param_named(enable_gvt, bool, 0400,
 192         "Enable support for Intel GVT-g graphics virtualization host support(default:false)");
 193 #endif
 194
 195 #if IS_ENABLED(CONFIG_DRM_I915_UNSTABLE_FAKE_LMEM)
 196 i915_param_named_unsafe(fake_lmem_start, ulong, 0400,
 197         "Fake LMEM start offset (default: 0)");
 198 #endif
 199
 200 static __always_inline void _print_param(struct drm_printer *p,
 201                                          const char *name,
 202                                          const char *type,
 203                                          const void *x)
 204 {
 205         if (!__builtin_strcmp(type, "bool"))
 206                 drm_printf(p, "i915.%s=%s\n", name, yesno(*(const bool *)x));
 207         else if (!__builtin_strcmp(type, "int"))
 208                 drm_printf(p, "i915.%s=%d\n", name, *(const int *)x);
 209         else if (!__builtin_strcmp(type, "unsigned int"))
 210                 drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x);
 211         else if (!__builtin_strcmp(type, "unsigned long"))
 212                 drm_printf(p, "i915.%s=%lu\n", name, *(const unsigned long *)x);
 213         else if (!__builtin_strcmp(type, "char *"))
 214                 drm_printf(p, "i915.%s=%s\n", name, *(const char **)x);
 215         else
 216                 WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n",
 217                           type, name);
 218 }
 219
 220 /**
 221  * i915_params_dump - dump i915 modparams
 222  * @params: i915 modparams
 223  * @p: the &drm_printer
 224  *
 225  * Pretty printer for i915 modparams.
 226  */
 227 void i915_params_dump(const struct i915_params *params, struct drm_printer *p)
 228 {
 229 #define PRINT(T, x, ...) _print_param(p, #x, #T, &params->x);
 230         I915_PARAMS_FOR_EACH(PRINT);
 231 #undef PRINT
 232 }
 233
 234 static __always_inline void dup_param(const char *type, void *x)
 235 {
 236         if (!__builtin_strcmp(type, "char *"))
 237                 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
 238 }
 239
 240 void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
 241 {
 242         *dest = *src;
 243 #define DUP(T, x, ...) dup_param(#T, &dest->x);
 244         I915_PARAMS_FOR_EACH(DUP);
 245 #undef DUP
 246 }
 247
 248 static __always_inline void free_param(const char *type, void *x)
 249 {
 250         if (!__builtin_strcmp(type, "char *")) {
 251                 kfree(*(void **)x);
 252                 *(void **)x = NULL;
 253         }
 254 }
 255
 256 /* free the allocated members, *not* the passed in params itself */
 257 void i915_params_free(struct i915_params *params)
 258 {
 259 #define FREE(T, x, ...) free_param(#T, &params->x);
 260         I915_PARAMS_FOR_EACH(FREE);
 261 #undef FREE
 262 }