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 i915_param_named(modeset, int, 0400, 44 "Use kernel modesetting [KMS] (0=disable, " 45 "1=on, -1=force vga console preference [default])"); 46 47 i915_param_named_unsafe(enable_dc, int, 0400, 48 "Enable power-saving display C-states. " 49 "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6)"); 50 51 i915_param_named_unsafe(enable_fbc, int, 0600, 52 "Enable frame buffer compression for power savings " 53 "(default: -1 (use per-chip default))"); 54 55 i915_param_named_unsafe(lvds_channel_mode, int, 0400, 56 "Specify LVDS channel mode " 57 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)"); 58 59 i915_param_named_unsafe(panel_use_ssc, int, 0600, 60 "Use Spread Spectrum Clock with panels [LVDS/eDP] " 61 "(default: auto from VBT)"); 62 63 i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, 64 "Override/Ignore selection of SDVO panel mode in the VBT " 65 "(-2=ignore, -1=auto [default], index in VBT BIOS table)"); 66 67 i915_param_named_unsafe(reset, int, 0600, 68 "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])"); 69 70 i915_param_named_unsafe(vbt_firmware, charp, 0400, 71 "Load VBT from specified file under /lib/firmware"); 72 73 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) 74 i915_param_named(error_capture, bool, 0600, 75 "Record the GPU state following a hang. " 76 "This information in /sys/class/drm/card<N>/error is vital for " 77 "triaging and debugging hangs."); 78 #endif 79 80 i915_param_named_unsafe(enable_hangcheck, bool, 0600, 81 "Periodically check GPU activity for detecting hangs. " 82 "WARNING: Disabling this can cause system wide hangs. " 83 "(default: true)"); 84 85 i915_param_named_unsafe(enable_psr, int, 0600, 86 "Enable PSR " 87 "(0=disabled, 1=enabled) " 88 "Default: -1 (use per-chip default)"); 89 90 i915_param_named_unsafe(alpha_support, bool, 0400, 91 "Enable alpha quality driver support for latest hardware. " 92 "See also CONFIG_DRM_I915_ALPHA_SUPPORT."); 93 94 i915_param_named_unsafe(disable_power_well, int, 0400, 95 "Disable display power wells when possible " 96 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 97 98 i915_param_named_unsafe(enable_ips, int, 0600, "Enable IPS (default: true)"); 99 100 i915_param_named(fastboot, int, 0600, 101 "Try to skip unnecessary mode sets at boot time " 102 "(0=disabled, 1=enabled) " 103 "Default: -1 (use per-chip default)"); 104 105 i915_param_named_unsafe(prefault_disable, bool, 0600, 106 "Disable page prefaulting for pread/pwrite/reloc (default:false). " 107 "For developers only."); 108 109 i915_param_named_unsafe(load_detect_test, bool, 0600, 110 "Force-enable the VGA load detect code for testing (default:false). " 111 "For developers only."); 112 113 i915_param_named_unsafe(force_reset_modeset_test, bool, 0600, 114 "Force a modeset during gpu reset for testing (default:false). " 115 "For developers only."); 116 117 i915_param_named_unsafe(invert_brightness, int, 0600, 118 "Invert backlight brightness " 119 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 120 "report PCI device ID, subsystem vendor and subsystem device ID " 121 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 122 "It will then be included in an upcoming module version."); 123 124 i915_param_named(disable_display, bool, 0400, 125 "Disable display (default: false)"); 126 127 i915_param_named(mmio_debug, int, 0600, 128 "Enable the MMIO debug code for the first N failures (default: off). " 129 "This may negatively affect performance."); 130 131 i915_param_named(verbose_state_checks, bool, 0600, 132 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 133 134 i915_param_named_unsafe(nuclear_pageflip, bool, 0400, 135 "Force enable atomic functionality on platforms that don't have full support yet."); 136 137 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 138 i915_param_named_unsafe(edp_vswing, int, 0400, 139 "Ignore/Override vswing pre-emph table selection from VBT " 140 "(0=use value from vbt [default], 1=low power swing(200mV)," 141 "2=default swing(400mV))"); 142 143 i915_param_named_unsafe(enable_guc, int, 0400, 144 "Enable GuC load for GuC submission and/or HuC load. " 145 "Required functionality can be selected using bitmask values. " 146 "(-1=auto, 0=disable [default], 1=GuC submission, 2=HuC load)"); 147 148 i915_param_named(guc_log_level, int, 0400, 149 "GuC firmware logging level. Requires GuC to be loaded. " 150 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)"); 151 152 i915_param_named_unsafe(guc_firmware_path, charp, 0400, 153 "GuC firmware path to use instead of the default one"); 154 155 i915_param_named_unsafe(huc_firmware_path, charp, 0400, 156 "HuC firmware path to use instead of the default one"); 157 158 i915_param_named_unsafe(dmc_firmware_path, charp, 0400, 159 "DMC firmware path to use instead of the default one"); 160 161 i915_param_named_unsafe(enable_dp_mst, bool, 0600, 162 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 163 164 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) 165 i915_param_named_unsafe(inject_load_failure, uint, 0400, 166 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)"); 167 #endif 168 169 i915_param_named(enable_dpcd_backlight, bool, 0600, 170 "Enable support for DPCD backlight control (default:false)"); 171 172 #if IS_ENABLED(CONFIG_DRM_I915_GVT) 173 i915_param_named(enable_gvt, bool, 0400, 174 "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); 175 #endif 176 177 static __always_inline void _print_param(struct drm_printer *p, 178 const char *name, 179 const char *type, 180 const void *x) 181 { 182 if (!__builtin_strcmp(type, "bool")) 183 drm_printf(p, "i915.%s=%s\n", name, yesno(*(const bool *)x)); 184 else if (!__builtin_strcmp(type, "int")) 185 drm_printf(p, "i915.%s=%d\n", name, *(const int *)x); 186 else if (!__builtin_strcmp(type, "unsigned int")) 187 drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x); 188 else if (!__builtin_strcmp(type, "char *")) 189 drm_printf(p, "i915.%s=%s\n", name, *(const char **)x); 190 else 191 WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n", 192 type, name); 193 } 194 195 /** 196 * i915_params_dump - dump i915 modparams 197 * @params: i915 modparams 198 * @p: the &drm_printer 199 * 200 * Pretty printer for i915 modparams. 201 */ 202 void i915_params_dump(const struct i915_params *params, struct drm_printer *p) 203 { 204 #define PRINT(T, x, ...) _print_param(p, #x, #T, ¶ms->x); 205 I915_PARAMS_FOR_EACH(PRINT); 206 #undef PRINT 207 } 208 209 static __always_inline void dup_param(const char *type, void *x) 210 { 211 if (!__builtin_strcmp(type, "char *")) 212 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC); 213 } 214 215 void i915_params_copy(struct i915_params *dest, const struct i915_params *src) 216 { 217 *dest = *src; 218 #define DUP(T, x, ...) dup_param(#T, &dest->x); 219 I915_PARAMS_FOR_EACH(DUP); 220 #undef DUP 221 } 222 223 static __always_inline void free_param(const char *type, void *x) 224 { 225 if (!__builtin_strcmp(type, "char *")) { 226 kfree(*(void **)x); 227 *(void **)x = NULL; 228 } 229 } 230 231 /* free the allocated members, *not* the passed in params itself */ 232 void i915_params_free(struct i915_params *params) 233 { 234 #define FREE(T, x, ...) free_param(#T, ¶ms->x); 235 I915_PARAMS_FOR_EACH(FREE); 236 #undef FREE 237 } 238