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(force_probe, charp, 0400, 91 "Force probe the driver for specified devices. " 92 "See CONFIG_DRM_I915_FORCE_PROBE for details."); 93 94 i915_param_named_unsafe(alpha_support, bool, 0400, 95 "Deprecated. See i915.force_probe."); 96 97 i915_param_named_unsafe(disable_power_well, int, 0400, 98 "Disable display power wells when possible " 99 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 100 101 i915_param_named_unsafe(enable_ips, int, 0600, "Enable IPS (default: true)"); 102 103 i915_param_named(fastboot, int, 0600, 104 "Try to skip unnecessary mode sets at boot time " 105 "(0=disabled, 1=enabled) " 106 "Default: -1 (use per-chip default)"); 107 108 i915_param_named_unsafe(prefault_disable, bool, 0600, 109 "Disable page prefaulting for pread/pwrite/reloc (default:false). " 110 "For developers only."); 111 112 i915_param_named_unsafe(load_detect_test, bool, 0600, 113 "Force-enable the VGA load detect code for testing (default:false). " 114 "For developers only."); 115 116 i915_param_named_unsafe(force_reset_modeset_test, bool, 0600, 117 "Force a modeset during gpu reset for testing (default:false). " 118 "For developers only."); 119 120 i915_param_named_unsafe(invert_brightness, int, 0600, 121 "Invert backlight brightness " 122 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 123 "report PCI device ID, subsystem vendor and subsystem device ID " 124 "to dri-devel@lists.freedesktop.org, if your machine needs it. " 125 "It will then be included in an upcoming module version."); 126 127 i915_param_named(disable_display, bool, 0400, 128 "Disable display (default: false)"); 129 130 i915_param_named(mmio_debug, int, 0600, 131 "Enable the MMIO debug code for the first N failures (default: off). " 132 "This may negatively affect performance."); 133 134 i915_param_named(verbose_state_checks, bool, 0600, 135 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 136 137 i915_param_named_unsafe(nuclear_pageflip, bool, 0400, 138 "Force enable atomic functionality on platforms that don't have full support yet."); 139 140 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 141 i915_param_named_unsafe(edp_vswing, int, 0400, 142 "Ignore/Override vswing pre-emph table selection from VBT " 143 "(0=use value from vbt [default], 1=low power swing(200mV)," 144 "2=default swing(400mV))"); 145 146 i915_param_named_unsafe(enable_guc, int, 0400, 147 "Enable GuC load for GuC submission and/or HuC load. " 148 "Required functionality can be selected using bitmask values. " 149 "(-1=auto, 0=disable [default], 1=GuC submission, 2=HuC load)"); 150 151 i915_param_named(guc_log_level, int, 0400, 152 "GuC firmware logging level. Requires GuC to be loaded. " 153 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)"); 154 155 i915_param_named_unsafe(guc_firmware_path, charp, 0400, 156 "GuC firmware path to use instead of the default one"); 157 158 i915_param_named_unsafe(huc_firmware_path, charp, 0400, 159 "HuC firmware path to use instead of the default one"); 160 161 i915_param_named_unsafe(dmc_firmware_path, charp, 0400, 162 "DMC firmware path to use instead of the default one"); 163 164 i915_param_named_unsafe(enable_dp_mst, bool, 0600, 165 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 166 167 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) 168 i915_param_named_unsafe(inject_load_failure, uint, 0400, 169 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)"); 170 #endif 171 172 i915_param_named(enable_dpcd_backlight, int, 0600, 173 "Enable support for DPCD backlight control" 174 "(-1=use per-VBT LFP backlight type setting, 0=disabled [default], 1=enabled)"); 175 176 #if IS_ENABLED(CONFIG_DRM_I915_GVT) 177 i915_param_named(enable_gvt, bool, 0400, 178 "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); 179 #endif 180 181 static __always_inline void _print_param(struct drm_printer *p, 182 const char *name, 183 const char *type, 184 const void *x) 185 { 186 if (!__builtin_strcmp(type, "bool")) 187 drm_printf(p, "i915.%s=%s\n", name, yesno(*(const bool *)x)); 188 else if (!__builtin_strcmp(type, "int")) 189 drm_printf(p, "i915.%s=%d\n", name, *(const int *)x); 190 else if (!__builtin_strcmp(type, "unsigned int")) 191 drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x); 192 else if (!__builtin_strcmp(type, "char *")) 193 drm_printf(p, "i915.%s=%s\n", name, *(const char **)x); 194 else 195 WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n", 196 type, name); 197 } 198 199 /** 200 * i915_params_dump - dump i915 modparams 201 * @params: i915 modparams 202 * @p: the &drm_printer 203 * 204 * Pretty printer for i915 modparams. 205 */ 206 void i915_params_dump(const struct i915_params *params, struct drm_printer *p) 207 { 208 #define PRINT(T, x, ...) _print_param(p, #x, #T, ¶ms->x); 209 I915_PARAMS_FOR_EACH(PRINT); 210 #undef PRINT 211 } 212 213 static __always_inline void dup_param(const char *type, void *x) 214 { 215 if (!__builtin_strcmp(type, "char *")) 216 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC); 217 } 218 219 void i915_params_copy(struct i915_params *dest, const struct i915_params *src) 220 { 221 *dest = *src; 222 #define DUP(T, x, ...) dup_param(#T, &dest->x); 223 I915_PARAMS_FOR_EACH(DUP); 224 #undef DUP 225 } 226 227 static __always_inline void free_param(const char *type, void *x) 228 { 229 if (!__builtin_strcmp(type, "char *")) { 230 kfree(*(void **)x); 231 *(void **)x = NULL; 232 } 233 } 234 235 /* free the allocated members, *not* the passed in params itself */ 236 void i915_params_free(struct i915_params *params) 237 { 238 #define FREE(T, x, ...) free_param(#T, ¶ms->x); 239 I915_PARAMS_FOR_EACH(FREE); 240 #undef FREE 241 } 242