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 <linux/string_helpers.h> 26 27 #include <drm/drm_print.h> 28 29 #include "i915_params.h" 30 #include "i915_drv.h" 31 32 DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0, 33 "DRM_UT_CORE", 34 "DRM_UT_DRIVER", 35 "DRM_UT_KMS", 36 "DRM_UT_PRIME", 37 "DRM_UT_ATOMIC", 38 "DRM_UT_VBL", 39 "DRM_UT_STATE", 40 "DRM_UT_LEASE", 41 "DRM_UT_DP", 42 "DRM_UT_DRMRES"); 43 44 #define i915_param_named(name, T, perm, desc) \ 45 module_param_named(name, i915_modparams.name, T, perm); \ 46 MODULE_PARM_DESC(name, desc) 47 #define i915_param_named_unsafe(name, T, perm, desc) \ 48 module_param_named_unsafe(name, i915_modparams.name, T, perm); \ 49 MODULE_PARM_DESC(name, desc) 50 51 struct i915_params i915_modparams __read_mostly = { 52 #define MEMBER(T, member, value, ...) .member = (value), 53 I915_PARAMS_FOR_EACH(MEMBER) 54 #undef MEMBER 55 }; 56 57 /* 58 * Note: As a rule, keep module parameter sysfs permissions read-only 59 * 0400. Runtime changes are only supported through i915 debugfs. 60 * 61 * For any exceptions requiring write access and runtime changes through module 62 * parameter sysfs, prevent debugfs file creation by setting the parameter's 63 * debugfs mode to 0. 64 */ 65 66 i915_param_named(modeset, int, 0400, 67 "Use kernel modesetting [KMS] (0=disable, " 68 "1=on, -1=force vga console preference [default])"); 69 70 i915_param_named_unsafe(enable_dc, int, 0400, 71 "Enable power-saving display C-states. " 72 "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; " 73 "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)"); 74 75 i915_param_named_unsafe(enable_fbc, int, 0400, 76 "Enable frame buffer compression for power savings " 77 "(default: -1 (use per-chip default))"); 78 79 i915_param_named_unsafe(lvds_channel_mode, int, 0400, 80 "Specify LVDS channel mode " 81 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)"); 82 83 i915_param_named_unsafe(panel_use_ssc, int, 0400, 84 "Use Spread Spectrum Clock with panels [LVDS/eDP] " 85 "(default: auto from VBT)"); 86 87 i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, 88 "Override/Ignore selection of SDVO panel mode in the VBT " 89 "(-2=ignore, -1=auto [default], index in VBT BIOS table)"); 90 91 i915_param_named_unsafe(reset, uint, 0400, 92 "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])"); 93 94 i915_param_named_unsafe(vbt_firmware, charp, 0400, 95 "Load VBT from specified file under /lib/firmware"); 96 97 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) 98 i915_param_named(error_capture, bool, 0400, 99 "Record the GPU state following a hang. " 100 "This information in /sys/class/drm/card<N>/error is vital for " 101 "triaging and debugging hangs."); 102 #endif 103 104 i915_param_named_unsafe(enable_hangcheck, bool, 0400, 105 "Periodically check GPU activity for detecting hangs. " 106 "WARNING: Disabling this can cause system wide hangs. " 107 "(default: true)"); 108 109 i915_param_named_unsafe(enable_psr, int, 0400, 110 "Enable PSR " 111 "(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) " 112 "Default: -1 (use per-chip default)"); 113 114 i915_param_named(psr_safest_params, bool, 0400, 115 "Replace PSR VBT parameters by the safest and not optimal ones. This " 116 "is helpful to detect if PSR issues are related to bad values set in " 117 " VBT. (0=use VBT parameters, 1=use safest parameters)"); 118 119 i915_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400, 120 "Enable PSR2 selective fetch " 121 "(0=disabled, 1=enabled) " 122 "Default: 0"); 123 124 i915_param_named_unsafe(enable_sagv, bool, 0600, 125 "Enable system agent voltage/frequency scaling (SAGV) (default: true)"); 126 127 i915_param_named_unsafe(force_probe, charp, 0400, 128 "Force probe options for specified supported devices. " 129 "See CONFIG_DRM_I915_FORCE_PROBE for details."); 130 131 i915_param_named_unsafe(disable_power_well, int, 0400, 132 "Disable display power wells when possible " 133 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 134 135 i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)"); 136 137 i915_param_named_unsafe(enable_dpt, bool, 0400, 138 "Enable display page table (DPT) (default: true)"); 139 140 i915_param_named(fastboot, int, 0400, 141 "Try to skip unnecessary mode sets at boot time " 142 "(0=disabled, 1=enabled) " 143 "Default: -1 (use per-chip default)"); 144 145 i915_param_named_unsafe(load_detect_test, bool, 0400, 146 "Force-enable the VGA load detect code for testing (default:false). " 147 "For developers only."); 148 149 i915_param_named_unsafe(force_reset_modeset_test, bool, 0400, 150 "Force a modeset during gpu reset for testing (default:false). " 151 "For developers only."); 152 153 i915_param_named_unsafe(invert_brightness, int, 0400, 154 "Invert backlight brightness " 155 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 156 "report PCI device ID, subsystem vendor and subsystem device ID " 157 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 158 "It will then be included in an upcoming module version."); 159 160 i915_param_named(disable_display, bool, 0400, 161 "Disable display (default: false)"); 162 163 i915_param_named(memtest, bool, 0400, 164 "Perform a read/write test of all device memory on module load (default: off)"); 165 166 i915_param_named(mmio_debug, int, 0400, 167 "Enable the MMIO debug code for the first N failures (default: off). " 168 "This may negatively affect performance."); 169 170 /* Special case writable file */ 171 i915_param_named(verbose_state_checks, bool, 0600, 172 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 173 174 i915_param_named_unsafe(nuclear_pageflip, bool, 0400, 175 "Force enable atomic functionality on platforms that don't have full support yet."); 176 177 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 178 i915_param_named_unsafe(edp_vswing, int, 0400, 179 "Ignore/Override vswing pre-emph table selection from VBT " 180 "(0=use value from vbt [default], 1=low power swing(200mV)," 181 "2=default swing(400mV))"); 182 183 i915_param_named_unsafe(enable_guc, int, 0400, 184 "Enable GuC load for GuC submission and/or HuC load. " 185 "Required functionality can be selected using bitmask values. " 186 "(-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load)"); 187 188 i915_param_named(guc_log_level, int, 0400, 189 "GuC firmware logging level. Requires GuC to be loaded. " 190 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)"); 191 192 i915_param_named_unsafe(guc_firmware_path, charp, 0400, 193 "GuC firmware path to use instead of the default one"); 194 195 i915_param_named_unsafe(huc_firmware_path, charp, 0400, 196 "HuC firmware path to use instead of the default one"); 197 198 i915_param_named_unsafe(dmc_firmware_path, charp, 0400, 199 "DMC firmware path to use instead of the default one"); 200 201 i915_param_named_unsafe(gsc_firmware_path, charp, 0400, 202 "GSC firmware path to use instead of the default one"); 203 204 i915_param_named_unsafe(enable_dp_mst, bool, 0400, 205 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 206 207 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) 208 i915_param_named_unsafe(inject_probe_failure, uint, 0400, 209 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)"); 210 #endif 211 212 i915_param_named(enable_dpcd_backlight, int, 0400, 213 "Enable support for DPCD backlight control" 214 "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)"); 215 216 #if IS_ENABLED(CONFIG_DRM_I915_GVT) 217 i915_param_named(enable_gvt, bool, 0400, 218 "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); 219 #endif 220 221 #if CONFIG_DRM_I915_REQUEST_TIMEOUT 222 i915_param_named_unsafe(request_timeout_ms, uint, 0600, 223 "Default request/fence/batch buffer expiration timeout."); 224 #endif 225 226 i915_param_named_unsafe(lmem_size, uint, 0400, 227 "Set the lmem size(in MiB) for each region. (default: 0, all memory)"); 228 i915_param_named_unsafe(lmem_bar_size, uint, 0400, 229 "Set the lmem bar size(in MiB)."); 230 231 static void _param_print_bool(struct drm_printer *p, const char *name, 232 bool val) 233 { 234 drm_printf(p, "i915.%s=%s\n", name, str_yes_no(val)); 235 } 236 237 static void _param_print_int(struct drm_printer *p, const char *name, 238 int val) 239 { 240 drm_printf(p, "i915.%s=%d\n", name, val); 241 } 242 243 static void _param_print_uint(struct drm_printer *p, const char *name, 244 unsigned int val) 245 { 246 drm_printf(p, "i915.%s=%u\n", name, val); 247 } 248 249 static void _param_print_ulong(struct drm_printer *p, const char *name, 250 unsigned long val) 251 { 252 drm_printf(p, "i915.%s=%lu\n", name, val); 253 } 254 255 static void _param_print_charp(struct drm_printer *p, const char *name, 256 const char *val) 257 { 258 drm_printf(p, "i915.%s=%s\n", name, val); 259 } 260 261 #define _param_print(p, name, val) \ 262 _Generic(val, \ 263 bool: _param_print_bool, \ 264 int: _param_print_int, \ 265 unsigned int: _param_print_uint, \ 266 unsigned long: _param_print_ulong, \ 267 char *: _param_print_charp)(p, name, val) 268 269 /** 270 * i915_params_dump - dump i915 modparams 271 * @params: i915 modparams 272 * @p: the &drm_printer 273 * 274 * Pretty printer for i915 modparams. 275 */ 276 void i915_params_dump(const struct i915_params *params, struct drm_printer *p) 277 { 278 #define PRINT(T, x, ...) _param_print(p, #x, params->x); 279 I915_PARAMS_FOR_EACH(PRINT); 280 #undef PRINT 281 } 282 283 static void _param_dup_charp(char **valp) 284 { 285 *valp = kstrdup(*valp, GFP_ATOMIC); 286 } 287 288 static void _param_nop(void *valp) 289 { 290 } 291 292 #define _param_dup(valp) \ 293 _Generic(valp, \ 294 char **: _param_dup_charp, \ 295 default: _param_nop)(valp) 296 297 void i915_params_copy(struct i915_params *dest, const struct i915_params *src) 298 { 299 *dest = *src; 300 #define DUP(T, x, ...) _param_dup(&dest->x); 301 I915_PARAMS_FOR_EACH(DUP); 302 #undef DUP 303 } 304 305 static void _param_free_charp(char **valp) 306 { 307 kfree(*valp); 308 *valp = NULL; 309 } 310 311 #define _param_free(valp) \ 312 _Generic(valp, \ 313 char **: _param_free_charp, \ 314 default: _param_nop)(valp) 315 316 /* free the allocated members, *not* the passed in params itself */ 317 void i915_params_free(struct i915_params *params) 318 { 319 #define FREE(T, x, ...) _param_free(¶ms->x); 320 I915_PARAMS_FOR_EACH(FREE); 321 #undef FREE 322 } 323