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 #define i915_param_named(name, T, perm, desc) \ 33 module_param_named(name, i915_modparams.name, T, perm); \ 34 MODULE_PARM_DESC(name, desc) 35 #define i915_param_named_unsafe(name, T, perm, desc) \ 36 module_param_named_unsafe(name, i915_modparams.name, T, perm); \ 37 MODULE_PARM_DESC(name, desc) 38 39 struct i915_params i915_modparams __read_mostly = { 40 #define MEMBER(T, member, value, ...) .member = (value), 41 I915_PARAMS_FOR_EACH(MEMBER) 42 #undef MEMBER 43 }; 44 45 /* 46 * Note: As a rule, keep module parameter sysfs permissions read-only 47 * 0400. Runtime changes are only supported through i915 debugfs. 48 * 49 * For any exceptions requiring write access and runtime changes through module 50 * parameter sysfs, prevent debugfs file creation by setting the parameter's 51 * debugfs mode to 0. 52 */ 53 54 i915_param_named(modeset, int, 0400, 55 "Use kernel modesetting [KMS] (0=disable, " 56 "1=on, -1=force vga console preference [default])"); 57 58 i915_param_named_unsafe(enable_dc, int, 0400, 59 "Enable power-saving display C-states. " 60 "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; " 61 "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)"); 62 63 i915_param_named_unsafe(enable_fbc, int, 0400, 64 "Enable frame buffer compression for power savings " 65 "(default: -1 (use per-chip default))"); 66 67 i915_param_named_unsafe(lvds_channel_mode, int, 0400, 68 "Specify LVDS channel mode " 69 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)"); 70 71 i915_param_named_unsafe(panel_use_ssc, int, 0400, 72 "Use Spread Spectrum Clock with panels [LVDS/eDP] " 73 "(default: auto from VBT)"); 74 75 i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, 76 "Override/Ignore selection of SDVO panel mode in the VBT " 77 "(-2=ignore, -1=auto [default], index in VBT BIOS table)"); 78 79 i915_param_named_unsafe(reset, uint, 0400, 80 "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])"); 81 82 i915_param_named_unsafe(vbt_firmware, charp, 0400, 83 "Load VBT from specified file under /lib/firmware"); 84 85 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) 86 i915_param_named(error_capture, bool, 0400, 87 "Record the GPU state following a hang. " 88 "This information in /sys/class/drm/card<N>/error is vital for " 89 "triaging and debugging hangs."); 90 #endif 91 92 i915_param_named_unsafe(enable_hangcheck, bool, 0400, 93 "Periodically check GPU activity for detecting hangs. " 94 "WARNING: Disabling this can cause system wide hangs. " 95 "(default: true)"); 96 97 i915_param_named_unsafe(enable_psr, int, 0400, 98 "Enable PSR " 99 "(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) " 100 "Default: -1 (use per-chip default)"); 101 102 i915_param_named(psr_safest_params, bool, 0400, 103 "Replace PSR VBT parameters by the safest and not optimal ones. This " 104 "is helpful to detect if PSR issues are related to bad values set in " 105 " VBT. (0=use VBT parameters, 1=use safest parameters)"); 106 107 i915_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400, 108 "Enable PSR2 selective fetch " 109 "(0=disabled, 1=enabled) " 110 "Default: 0"); 111 112 i915_param_named_unsafe(force_probe, charp, 0400, 113 "Force probe the driver for specified devices. " 114 "See CONFIG_DRM_I915_FORCE_PROBE for details."); 115 116 i915_param_named_unsafe(disable_power_well, int, 0400, 117 "Disable display power wells when possible " 118 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 119 120 i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)"); 121 122 i915_param_named(fastboot, int, 0400, 123 "Try to skip unnecessary mode sets at boot time " 124 "(0=disabled, 1=enabled) " 125 "Default: -1 (use per-chip default)"); 126 127 i915_param_named_unsafe(load_detect_test, bool, 0400, 128 "Force-enable the VGA load detect code for testing (default:false). " 129 "For developers only."); 130 131 i915_param_named_unsafe(force_reset_modeset_test, bool, 0400, 132 "Force a modeset during gpu reset for testing (default:false). " 133 "For developers only."); 134 135 i915_param_named_unsafe(invert_brightness, int, 0400, 136 "Invert backlight brightness " 137 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 138 "report PCI device ID, subsystem vendor and subsystem device ID " 139 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 140 "It will then be included in an upcoming module version."); 141 142 i915_param_named(disable_display, bool, 0400, 143 "Disable display (default: false)"); 144 145 i915_param_named(memtest, bool, 0400, 146 "Perform a read/write test of all device memory on module load (default: off)"); 147 148 i915_param_named(mmio_debug, int, 0400, 149 "Enable the MMIO debug code for the first N failures (default: off). " 150 "This may negatively affect performance."); 151 152 /* Special case writable file */ 153 i915_param_named(verbose_state_checks, bool, 0600, 154 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 155 156 i915_param_named_unsafe(nuclear_pageflip, bool, 0400, 157 "Force enable atomic functionality on platforms that don't have full support yet."); 158 159 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 160 i915_param_named_unsafe(edp_vswing, int, 0400, 161 "Ignore/Override vswing pre-emph table selection from VBT " 162 "(0=use value from vbt [default], 1=low power swing(200mV)," 163 "2=default swing(400mV))"); 164 165 i915_param_named_unsafe(enable_guc, int, 0400, 166 "Enable GuC load for GuC submission and/or HuC load. " 167 "Required functionality can be selected using bitmask values. " 168 "(-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load)"); 169 170 i915_param_named(guc_log_level, int, 0400, 171 "GuC firmware logging level. Requires GuC to be loaded. " 172 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)"); 173 174 i915_param_named_unsafe(guc_firmware_path, charp, 0400, 175 "GuC firmware path to use instead of the default one"); 176 177 i915_param_named_unsafe(huc_firmware_path, charp, 0400, 178 "HuC firmware path to use instead of the default one"); 179 180 i915_param_named_unsafe(dmc_firmware_path, charp, 0400, 181 "DMC firmware path to use instead of the default one"); 182 183 i915_param_named_unsafe(enable_dp_mst, bool, 0400, 184 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 185 186 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) 187 i915_param_named_unsafe(inject_probe_failure, uint, 0400, 188 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)"); 189 #endif 190 191 i915_param_named(enable_dpcd_backlight, int, 0400, 192 "Enable support for DPCD backlight control" 193 "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)"); 194 195 #if IS_ENABLED(CONFIG_DRM_I915_GVT) 196 i915_param_named(enable_gvt, bool, 0400, 197 "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); 198 #endif 199 200 #if CONFIG_DRM_I915_REQUEST_TIMEOUT 201 i915_param_named_unsafe(request_timeout_ms, uint, 0600, 202 "Default request/fence/batch buffer expiration timeout."); 203 #endif 204 205 static __always_inline void _print_param(struct drm_printer *p, 206 const char *name, 207 const char *type, 208 const void *x) 209 { 210 if (!__builtin_strcmp(type, "bool")) 211 drm_printf(p, "i915.%s=%s\n", name, 212 str_yes_no(*(const bool *)x)); 213 else if (!__builtin_strcmp(type, "int")) 214 drm_printf(p, "i915.%s=%d\n", name, *(const int *)x); 215 else if (!__builtin_strcmp(type, "unsigned int")) 216 drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x); 217 else if (!__builtin_strcmp(type, "unsigned long")) 218 drm_printf(p, "i915.%s=%lu\n", name, *(const unsigned long *)x); 219 else if (!__builtin_strcmp(type, "char *")) 220 drm_printf(p, "i915.%s=%s\n", name, *(const char **)x); 221 else 222 WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n", 223 type, name); 224 } 225 226 /** 227 * i915_params_dump - dump i915 modparams 228 * @params: i915 modparams 229 * @p: the &drm_printer 230 * 231 * Pretty printer for i915 modparams. 232 */ 233 void i915_params_dump(const struct i915_params *params, struct drm_printer *p) 234 { 235 #define PRINT(T, x, ...) _print_param(p, #x, #T, ¶ms->x); 236 I915_PARAMS_FOR_EACH(PRINT); 237 #undef PRINT 238 } 239 240 static __always_inline void dup_param(const char *type, void *x) 241 { 242 if (!__builtin_strcmp(type, "char *")) 243 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC); 244 } 245 246 void i915_params_copy(struct i915_params *dest, const struct i915_params *src) 247 { 248 *dest = *src; 249 #define DUP(T, x, ...) dup_param(#T, &dest->x); 250 I915_PARAMS_FOR_EACH(DUP); 251 #undef DUP 252 } 253 254 static __always_inline void free_param(const char *type, void *x) 255 { 256 if (!__builtin_strcmp(type, "char *")) { 257 kfree(*(void **)x); 258 *(void **)x = NULL; 259 } 260 } 261 262 /* free the allocated members, *not* the passed in params itself */ 263 void i915_params_free(struct i915_params *params) 264 { 265 #define FREE(T, x, ...) free_param(#T, ¶ms->x); 266 I915_PARAMS_FOR_EACH(FREE); 267 #undef FREE 268 } 269