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, ¶ms->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, ¶ms->x); 260 I915_PARAMS_FOR_EACH(FREE); 261 #undef FREE 262 } 263