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(force_probe, charp, 0400, 106 "Force probe the driver for specified devices. " 107 "See CONFIG_DRM_I915_FORCE_PROBE for details."); 108 109 i915_param_named_unsafe(disable_power_well, int, 0400, 110 "Disable display power wells when possible " 111 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 112 113 i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)"); 114 115 i915_param_named(fastboot, int, 0400, 116 "Try to skip unnecessary mode sets at boot time " 117 "(0=disabled, 1=enabled) " 118 "Default: -1 (use per-chip default)"); 119 120 i915_param_named_unsafe(load_detect_test, bool, 0400, 121 "Force-enable the VGA load detect code for testing (default:false). " 122 "For developers only."); 123 124 i915_param_named_unsafe(force_reset_modeset_test, bool, 0400, 125 "Force a modeset during gpu reset for testing (default:false). " 126 "For developers only."); 127 128 i915_param_named_unsafe(invert_brightness, int, 0400, 129 "Invert backlight brightness " 130 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 131 "report PCI device ID, subsystem vendor and subsystem device ID " 132 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 133 "It will then be included in an upcoming module version."); 134 135 i915_param_named(disable_display, bool, 0400, 136 "Disable display (default: false)"); 137 138 i915_param_named(mmio_debug, int, 0400, 139 "Enable the MMIO debug code for the first N failures (default: off). " 140 "This may negatively affect performance."); 141 142 /* Special case writable file */ 143 i915_param_named(verbose_state_checks, bool, 0600, 144 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 145 146 i915_param_named_unsafe(nuclear_pageflip, bool, 0400, 147 "Force enable atomic functionality on platforms that don't have full support yet."); 148 149 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 150 i915_param_named_unsafe(edp_vswing, int, 0400, 151 "Ignore/Override vswing pre-emph table selection from VBT " 152 "(0=use value from vbt [default], 1=low power swing(200mV)," 153 "2=default swing(400mV))"); 154 155 i915_param_named_unsafe(enable_guc, int, 0400, 156 "Enable GuC load for GuC submission and/or HuC load. " 157 "Required functionality can be selected using bitmask values. " 158 "(-1=auto, 0=disable [default], 1=GuC submission, 2=HuC load)"); 159 160 i915_param_named(guc_log_level, int, 0400, 161 "GuC firmware logging level. Requires GuC to be loaded. " 162 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)"); 163 164 i915_param_named_unsafe(guc_firmware_path, charp, 0400, 165 "GuC firmware path to use instead of the default one"); 166 167 i915_param_named_unsafe(huc_firmware_path, charp, 0400, 168 "HuC firmware path to use instead of the default one"); 169 170 i915_param_named_unsafe(dmc_firmware_path, charp, 0400, 171 "DMC firmware path to use instead of the default one"); 172 173 i915_param_named_unsafe(enable_dp_mst, bool, 0400, 174 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 175 176 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) 177 i915_param_named_unsafe(inject_probe_failure, uint, 0400, 178 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)"); 179 #endif 180 181 i915_param_named(enable_dpcd_backlight, int, 0400, 182 "Enable support for DPCD backlight control" 183 "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enabled)"); 184 185 #if IS_ENABLED(CONFIG_DRM_I915_GVT) 186 i915_param_named(enable_gvt, bool, 0400, 187 "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); 188 #endif 189 190 #if IS_ENABLED(CONFIG_DRM_I915_UNSTABLE_FAKE_LMEM) 191 i915_param_named_unsafe(fake_lmem_start, ulong, 0400, 192 "Fake LMEM start offset (default: 0)"); 193 #endif 194 195 static __always_inline void _print_param(struct drm_printer *p, 196 const char *name, 197 const char *type, 198 const void *x) 199 { 200 if (!__builtin_strcmp(type, "bool")) 201 drm_printf(p, "i915.%s=%s\n", name, yesno(*(const bool *)x)); 202 else if (!__builtin_strcmp(type, "int")) 203 drm_printf(p, "i915.%s=%d\n", name, *(const int *)x); 204 else if (!__builtin_strcmp(type, "unsigned int")) 205 drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x); 206 else if (!__builtin_strcmp(type, "unsigned long")) 207 drm_printf(p, "i915.%s=%lu\n", name, *(const unsigned long *)x); 208 else if (!__builtin_strcmp(type, "char *")) 209 drm_printf(p, "i915.%s=%s\n", name, *(const char **)x); 210 else 211 WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n", 212 type, name); 213 } 214 215 /** 216 * i915_params_dump - dump i915 modparams 217 * @params: i915 modparams 218 * @p: the &drm_printer 219 * 220 * Pretty printer for i915 modparams. 221 */ 222 void i915_params_dump(const struct i915_params *params, struct drm_printer *p) 223 { 224 #define PRINT(T, x, ...) _print_param(p, #x, #T, ¶ms->x); 225 I915_PARAMS_FOR_EACH(PRINT); 226 #undef PRINT 227 } 228 229 static __always_inline void dup_param(const char *type, void *x) 230 { 231 if (!__builtin_strcmp(type, "char *")) 232 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC); 233 } 234 235 void i915_params_copy(struct i915_params *dest, const struct i915_params *src) 236 { 237 *dest = *src; 238 #define DUP(T, x, ...) dup_param(#T, &dest->x); 239 I915_PARAMS_FOR_EACH(DUP); 240 #undef DUP 241 } 242 243 static __always_inline void free_param(const char *type, void *x) 244 { 245 if (!__builtin_strcmp(type, "char *")) { 246 kfree(*(void **)x); 247 *(void **)x = NULL; 248 } 249 } 250 251 /* free the allocated members, *not* the passed in params itself */ 252 void i915_params_free(struct i915_params *params) 253 { 254 #define FREE(T, x, ...) free_param(#T, ¶ms->x); 255 I915_PARAMS_FOR_EACH(FREE); 256 #undef FREE 257 } 258