1 /* $NetBSD: i915_params.c,v 1.6 2021/12/19 01:43:51 riastradh Exp $ */ 2 3 /* 4 * Copyright 2014 Intel Corporation 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sub license, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial portions 16 * of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 23 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 24 * IN THE SOFTWARE. 25 */ 26 27 #include <sys/cdefs.h> 28 __KERNEL_RCSID(0, "$NetBSD: i915_params.c,v 1.6 2021/12/19 01:43:51 riastradh Exp $"); 29 30 #include <drm/drm_print.h> 31 32 #include "i915_params.h" 33 #include "i915_drv.h" 34 35 #define i915_param_named(name, T, perm, desc) \ 36 module_param_named(name, i915_modparams.name, T, perm); \ 37 MODULE_PARM_DESC(name, desc) 38 #define i915_param_named_unsafe(name, T, perm, desc) \ 39 module_param_named_unsafe(name, i915_modparams.name, T, perm); \ 40 MODULE_PARM_DESC(name, desc) 41 42 struct i915_params i915_modparams __read_mostly = { 43 #define MEMBER(T, member, value) .member = (value), 44 I915_PARAMS_FOR_EACH(MEMBER) 45 #undef MEMBER 46 }; 47 48 i915_param_named(modeset, int, 0400, 49 "Use kernel modesetting [KMS] (0=disable, " 50 "1=on, -1=force vga console preference [default])"); 51 52 i915_param_named_unsafe(enable_dc, int, 0400, 53 "Enable power-saving display C-states. " 54 "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; " 55 "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)"); 56 57 i915_param_named_unsafe(enable_fbc, int, 0600, 58 "Enable frame buffer compression for power savings " 59 "(default: -1 (use per-chip default))"); 60 61 i915_param_named_unsafe(lvds_channel_mode, int, 0400, 62 "Specify LVDS channel mode " 63 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)"); 64 65 i915_param_named_unsafe(panel_use_ssc, int, 0600, 66 "Use Spread Spectrum Clock with panels [LVDS/eDP] " 67 "(default: auto from VBT)"); 68 69 i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400, 70 "Override/Ignore selection of SDVO panel mode in the VBT " 71 "(-2=ignore, -1=auto [default], index in VBT BIOS table)"); 72 73 i915_param_named_unsafe(reset, int, 0600, 74 "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])"); 75 76 i915_param_named_unsafe(vbt_firmware, charp, 0400, 77 "Load VBT from specified file under /lib/firmware"); 78 79 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) 80 i915_param_named(error_capture, bool, 0600, 81 "Record the GPU state following a hang. " 82 "This information in /sys/class/drm/card<N>/error is vital for " 83 "triaging and debugging hangs."); 84 #endif 85 86 i915_param_named_unsafe(enable_hangcheck, bool, 0600, 87 "Periodically check GPU activity for detecting hangs. " 88 "WARNING: Disabling this can cause system wide hangs. " 89 "(default: true)"); 90 91 i915_param_named_unsafe(enable_psr, int, 0600, 92 "Enable PSR " 93 "(0=disabled, 1=enabled) " 94 "Default: -1 (use per-chip default)"); 95 96 i915_param_named_unsafe(force_probe, charp, 0400, 97 "Force probe the driver for specified devices. " 98 "See CONFIG_DRM_I915_FORCE_PROBE for details."); 99 100 i915_param_named_unsafe(alpha_support, bool, 0400, 101 "Deprecated. See i915.force_probe."); 102 103 i915_param_named_unsafe(disable_power_well, int, 0400, 104 "Disable display power wells when possible " 105 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)"); 106 107 i915_param_named_unsafe(enable_ips, int, 0600, "Enable IPS (default: true)"); 108 109 i915_param_named(fastboot, int, 0600, 110 "Try to skip unnecessary mode sets at boot time " 111 "(0=disabled, 1=enabled) " 112 "Default: -1 (use per-chip default)"); 113 114 i915_param_named_unsafe(prefault_disable, bool, 0600, 115 "Disable page prefaulting for pread/pwrite/reloc (default:false). " 116 "For developers only."); 117 118 i915_param_named_unsafe(load_detect_test, bool, 0600, 119 "Force-enable the VGA load detect code for testing (default:false). " 120 "For developers only."); 121 122 i915_param_named_unsafe(force_reset_modeset_test, bool, 0600, 123 "Force a modeset during gpu reset for testing (default:false). " 124 "For developers only."); 125 126 i915_param_named_unsafe(invert_brightness, int, 0600, 127 "Invert backlight brightness " 128 "(-1 force normal, 0 machine defaults, 1 force inversion), please " 129 "report PCI device ID, subsystem vendor and subsystem device ID " 130 "to dri-devel (at) lists.freedesktop.org, if your machine needs it. " 131 "It will then be included in an upcoming module version."); 132 133 i915_param_named(disable_display, bool, 0400, 134 "Disable display (default: false)"); 135 136 i915_param_named(mmio_debug, int, 0600, 137 "Enable the MMIO debug code for the first N failures (default: off). " 138 "This may negatively affect performance."); 139 140 i915_param_named(verbose_state_checks, bool, 0600, 141 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions."); 142 143 i915_param_named_unsafe(nuclear_pageflip, bool, 0400, 144 "Force enable atomic functionality on platforms that don't have full support yet."); 145 146 /* WA to get away with the default setting in VBT for early platforms.Will be removed */ 147 i915_param_named_unsafe(edp_vswing, int, 0400, 148 "Ignore/Override vswing pre-emph table selection from VBT " 149 "(0=use value from vbt [default], 1=low power swing(200mV)," 150 "2=default swing(400mV))"); 151 152 i915_param_named_unsafe(enable_guc, int, 0400, 153 "Enable GuC load for GuC submission and/or HuC load. " 154 "Required functionality can be selected using bitmask values. " 155 "(-1=auto, 0=disable [default], 1=GuC submission, 2=HuC load)"); 156 157 i915_param_named(guc_log_level, int, 0400, 158 "GuC firmware logging level. Requires GuC to be loaded. " 159 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)"); 160 161 i915_param_named_unsafe(guc_firmware_path, charp, 0400, 162 "GuC firmware path to use instead of the default one"); 163 164 i915_param_named_unsafe(huc_firmware_path, charp, 0400, 165 "HuC firmware path to use instead of the default one"); 166 167 i915_param_named_unsafe(dmc_firmware_path, charp, 0400, 168 "DMC firmware path to use instead of the default one"); 169 170 i915_param_named_unsafe(enable_dp_mst, bool, 0600, 171 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)"); 172 173 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG) 174 i915_param_named_unsafe(inject_probe_failure, uint, 0400, 175 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)"); 176 #endif 177 178 i915_param_named(enable_dpcd_backlight, int, 0600, 179 "Enable support for DPCD backlight control" 180 "(-1=use per-VBT LFP backlight type setting, 0=disabled [default], 1=enabled)"); 181 182 #if IS_ENABLED(CONFIG_DRM_I915_GVT) 183 i915_param_named(enable_gvt, bool, 0400, 184 "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); 185 #endif 186 187 #if IS_ENABLED(CONFIG_DRM_I915_UNSTABLE_FAKE_LMEM) 188 i915_param_named_unsafe(fake_lmem_start, ulong, 0600, 189 "Fake LMEM start offset (default: 0)"); 190 #endif 191 192 static __always_inline void _print_param(struct drm_printer *p, 193 const char *name, 194 const char *type, 195 const void *x) 196 { 197 if (!__builtin_strcmp(type, "bool")) 198 drm_printf(p, "i915.%s=%s\n", name, yesno(*(const bool *)x)); 199 else if (!__builtin_strcmp(type, "int")) 200 drm_printf(p, "i915.%s=%d\n", name, *(const int *)x); 201 else if (!__builtin_strcmp(type, "unsigned int")) 202 drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x); 203 else if (!__builtin_strcmp(type, "unsigned long")) 204 drm_printf(p, "i915.%s=%lu\n", name, *(const unsigned long *)x); 205 else if (!__builtin_strcmp(type, "char *")) 206 drm_printf(p, "i915.%s=%s\n", name, *(const char *const *)x); 207 else 208 WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n", 209 type, name); 210 } 211 212 /** 213 * i915_params_dump - dump i915 modparams 214 * @params: i915 modparams 215 * @p: the &drm_printer 216 * 217 * Pretty printer for i915 modparams. 218 */ 219 void i915_params_dump(const struct i915_params *params, struct drm_printer *p) 220 { 221 #define PRINT(T, x, ...) _print_param(p, #x, #T, ¶ms->x); 222 I915_PARAMS_FOR_EACH(PRINT); 223 #undef PRINT 224 } 225 226 static __always_inline void dup_param(const char *type, void *x) 227 { 228 if (!__builtin_strcmp(type, "char *")) 229 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC); 230 } 231 232 void i915_params_copy(struct i915_params *dest, const struct i915_params *src) 233 { 234 *dest = *src; 235 #define DUP(T, x, ...) dup_param(#T, &dest->x); 236 I915_PARAMS_FOR_EACH(DUP); 237 #undef DUP 238 } 239 240 static __always_inline void free_param(const char *type, void *x) 241 { 242 if (!__builtin_strcmp(type, "char *")) { 243 kfree(*(void **)x); 244 *(void **)x = NULL; 245 } 246 } 247 248 /* free the allocated members, *not* the passed in params itself */ 249 void i915_params_free(struct i915_params *params) 250 { 251 #define FREE(T, x, ...) free_param(#T, ¶ms->x); 252 I915_PARAMS_FOR_EACH(FREE); 253 #undef FREE 254 } 255
Indexes created Sat Sep 20 22:09:52 GMT 2025