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 DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
33 "DRM_UT_CORE",
34 "DRM_UT_DRIVER",
35 "DRM_UT_KMS",
36 "DRM_UT_PRIME",
37 "DRM_UT_ATOMIC",
38 "DRM_UT_VBL",
39 "DRM_UT_STATE",
40 "DRM_UT_LEASE",
41 "DRM_UT_DP",
42 "DRM_UT_DRMRES");
43
44 #define i915_param_named(name, T, perm, desc) \
45 module_param_named(name, i915_modparams.name, T, perm); \
46 MODULE_PARM_DESC(name, desc)
47 #define i915_param_named_unsafe(name, T, perm, desc) \
48 module_param_named_unsafe(name, i915_modparams.name, T, perm); \
49 MODULE_PARM_DESC(name, desc)
50
51 struct i915_params i915_modparams __read_mostly = {
52 #define MEMBER(T, member, value, ...) .member = (value),
53 I915_PARAMS_FOR_EACH(MEMBER)
54 #undef MEMBER
55 };
56
57 /*
58 * Note: As a rule, keep module parameter sysfs permissions read-only
59 * 0400. Runtime changes are only supported through i915 debugfs.
60 *
61 * For any exceptions requiring write access and runtime changes through module
62 * parameter sysfs, prevent debugfs file creation by setting the parameter's
63 * debugfs mode to 0.
64 */
65
66 i915_param_named(modeset, int, 0400,
67 "Use kernel modesetting [KMS] (0=disable, "
68 "1=on, -1=force vga console preference [default])");
69
70 i915_param_named_unsafe(enable_dc, int, 0400,
71 "Enable power-saving display C-states. "
72 "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; "
73 "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)");
74
75 i915_param_named_unsafe(enable_fbc, int, 0400,
76 "Enable frame buffer compression for power savings "
77 "(default: -1 (use per-chip default))");
78
79 i915_param_named_unsafe(lvds_channel_mode, int, 0400,
80 "Specify LVDS channel mode "
81 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
82
83 i915_param_named_unsafe(panel_use_ssc, int, 0400,
84 "Use Spread Spectrum Clock with panels [LVDS/eDP] "
85 "(default: auto from VBT)");
86
87 i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400,
88 "Override/Ignore selection of SDVO panel mode in the VBT "
89 "(-2=ignore, -1=auto [default], index in VBT BIOS table)");
90
91 i915_param_named_unsafe(reset, uint, 0400,
92 "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])");
93
94 i915_param_named_unsafe(vbt_firmware, charp, 0400,
95 "Load VBT from specified file under /lib/firmware");
96
97 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
98 i915_param_named(error_capture, bool, 0400,
99 "Record the GPU state following a hang. "
100 "This information in /sys/class/drm/card<N>/error is vital for "
101 "triaging and debugging hangs.");
102 #endif
103
104 i915_param_named_unsafe(enable_hangcheck, bool, 0400,
105 "Periodically check GPU activity for detecting hangs. "
106 "WARNING: Disabling this can cause system wide hangs. "
107 "(default: true)");
108
109 i915_param_named_unsafe(enable_psr, int, 0400,
110 "Enable PSR "
111 "(0=disabled, 1=enable up to PSR1, 2=enable up to PSR2) "
112 "Default: -1 (use per-chip default)");
113
114 i915_param_named(psr_safest_params, bool, 0400,
115 "Replace PSR VBT parameters by the safest and not optimal ones. This "
116 "is helpful to detect if PSR issues are related to bad values set in "
117 " VBT. (0=use VBT parameters, 1=use safest parameters)");
118
119 i915_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400,
120 "Enable PSR2 selective fetch "
121 "(0=disabled, 1=enabled) "
122 "Default: 0");
123
124 i915_param_named_unsafe(enable_sagv, bool, 0600,
125 "Enable system agent voltage/frequency scaling (SAGV) (default: true)");
126
127 i915_param_named_unsafe(force_probe, charp, 0400,
128 "Force probe options for specified supported devices. "
129 "See CONFIG_DRM_I915_FORCE_PROBE for details.");
130
131 i915_param_named_unsafe(disable_power_well, int, 0400,
132 "Disable display power wells when possible "
133 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
134
135 i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)");
136
137 i915_param_named_unsafe(enable_dpt, bool, 0400,
138 "Enable display page table (DPT) (default: true)");
139
140 i915_param_named(fastboot, int, 0400,
141 "Try to skip unnecessary mode sets at boot time "
142 "(0=disabled, 1=enabled) "
143 "Default: -1 (use per-chip default)");
144
145 i915_param_named_unsafe(load_detect_test, bool, 0400,
146 "Force-enable the VGA load detect code for testing (default:false). "
147 "For developers only.");
148
149 i915_param_named_unsafe(force_reset_modeset_test, bool, 0400,
150 "Force a modeset during gpu reset for testing (default:false). "
151 "For developers only.");
152
153 i915_param_named_unsafe(invert_brightness, int, 0400,
154 "Invert backlight brightness "
155 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
156 "report PCI device ID, subsystem vendor and subsystem device ID "
157 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
158 "It will then be included in an upcoming module version.");
159
160 i915_param_named(disable_display, bool, 0400,
161 "Disable display (default: false)");
162
163 i915_param_named(memtest, bool, 0400,
164 "Perform a read/write test of all device memory on module load (default: off)");
165
166 i915_param_named(mmio_debug, int, 0400,
167 "Enable the MMIO debug code for the first N failures (default: off). "
168 "This may negatively affect performance.");
169
170 /* Special case writable file */
171 i915_param_named(verbose_state_checks, bool, 0600,
172 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
173
174 i915_param_named_unsafe(nuclear_pageflip, bool, 0400,
175 "Force enable atomic functionality on platforms that don't have full support yet.");
176
177 /* WA to get away with the default setting in VBT for early platforms.Will be removed */
178 i915_param_named_unsafe(edp_vswing, int, 0400,
179 "Ignore/Override vswing pre-emph table selection from VBT "
180 "(0=use value from vbt [default], 1=low power swing(200mV),"
181 "2=default swing(400mV))");
182
183 i915_param_named_unsafe(enable_guc, int, 0400,
184 "Enable GuC load for GuC submission and/or HuC load. "
185 "Required functionality can be selected using bitmask values. "
186 "(-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load)");
187
188 i915_param_named(guc_log_level, int, 0400,
189 "GuC firmware logging level. Requires GuC to be loaded. "
190 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)");
191
192 i915_param_named_unsafe(guc_firmware_path, charp, 0400,
193 "GuC firmware path to use instead of the default one");
194
195 i915_param_named_unsafe(huc_firmware_path, charp, 0400,
196 "HuC firmware path to use instead of the default one");
197
198 i915_param_named_unsafe(dmc_firmware_path, charp, 0400,
199 "DMC firmware path to use instead of the default one");
200
201 i915_param_named_unsafe(gsc_firmware_path, charp, 0400,
202 "GSC firmware path to use instead of the default one");
203
204 i915_param_named_unsafe(enable_dp_mst, bool, 0400,
205 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
206
207 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
208 i915_param_named_unsafe(inject_probe_failure, uint, 0400,
209 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
210 #endif
211
212 i915_param_named(enable_dpcd_backlight, int, 0400,
213 "Enable support for DPCD backlight control"
214 "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)");
215
216 #if IS_ENABLED(CONFIG_DRM_I915_GVT)
217 i915_param_named(enable_gvt, bool, 0400,
218 "Enable support for Intel GVT-g graphics virtualization host support(default:false)");
219 #endif
220
221 #if CONFIG_DRM_I915_REQUEST_TIMEOUT
222 i915_param_named_unsafe(request_timeout_ms, uint, 0600,
223 "Default request/fence/batch buffer expiration timeout.");
224 #endif
225
226 i915_param_named_unsafe(lmem_size, uint, 0400,
227 "Set the lmem size(in MiB) for each region. (default: 0, all memory)");
228 i915_param_named_unsafe(lmem_bar_size, uint, 0400,
229 "Set the lmem bar size(in MiB).");
230
_param_print_bool(struct drm_printer * p,const char * name,bool val)231 static void _param_print_bool(struct drm_printer *p, const char *name,
232 bool val)
233 {
234 drm_printf(p, "i915.%s=%s\n", name, str_yes_no(val));
235 }
236
_param_print_int(struct drm_printer * p,const char * name,int val)237 static void _param_print_int(struct drm_printer *p, const char *name,
238 int val)
239 {
240 drm_printf(p, "i915.%s=%d\n", name, val);
241 }
242
_param_print_uint(struct drm_printer * p,const char * name,unsigned int val)243 static void _param_print_uint(struct drm_printer *p, const char *name,
244 unsigned int val)
245 {
246 drm_printf(p, "i915.%s=%u\n", name, val);
247 }
248
_param_print_ulong(struct drm_printer * p,const char * name,unsigned long val)249 static void _param_print_ulong(struct drm_printer *p, const char *name,
250 unsigned long val)
251 {
252 drm_printf(p, "i915.%s=%lu\n", name, val);
253 }
254
_param_print_charp(struct drm_printer * p,const char * name,const char * val)255 static void _param_print_charp(struct drm_printer *p, const char *name,
256 const char *val)
257 {
258 drm_printf(p, "i915.%s=%s\n", name, val);
259 }
260
261 #define _param_print(p, name, val) \
262 _Generic(val, \
263 bool: _param_print_bool, \
264 int: _param_print_int, \
265 unsigned int: _param_print_uint, \
266 unsigned long: _param_print_ulong, \
267 char *: _param_print_charp)(p, name, val)
268
269 /**
270 * i915_params_dump - dump i915 modparams
271 * @params: i915 modparams
272 * @p: the &drm_printer
273 *
274 * Pretty printer for i915 modparams.
275 */
i915_params_dump(const struct i915_params * params,struct drm_printer * p)276 void i915_params_dump(const struct i915_params *params, struct drm_printer *p)
277 {
278 #define PRINT(T, x, ...) _param_print(p, #x, params->x);
279 I915_PARAMS_FOR_EACH(PRINT);
280 #undef PRINT
281 }
282
_param_dup_charp(char ** valp)283 static void _param_dup_charp(char **valp)
284 {
285 *valp = kstrdup(*valp, GFP_ATOMIC);
286 }
287
_param_nop(void * valp)288 static void _param_nop(void *valp)
289 {
290 }
291
292 #define _param_dup(valp) \
293 _Generic(valp, \
294 char **: _param_dup_charp, \
295 default: _param_nop)(valp)
296
i915_params_copy(struct i915_params * dest,const struct i915_params * src)297 void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
298 {
299 *dest = *src;
300 #define DUP(T, x, ...) _param_dup(&dest->x);
301 I915_PARAMS_FOR_EACH(DUP);
302 #undef DUP
303 }
304
_param_free_charp(char ** valp)305 static void _param_free_charp(char **valp)
306 {
307 kfree(*valp);
308 *valp = NULL;
309 }
310
311 #define _param_free(valp) \
312 _Generic(valp, \
313 char **: _param_free_charp, \
314 default: _param_nop)(valp)
315
316 /* free the allocated members, *not* the passed in params itself */
i915_params_free(struct i915_params * params)317 void i915_params_free(struct i915_params *params)
318 {
319 #define FREE(T, x, ...) _param_free(¶ms->x);
320 I915_PARAMS_FOR_EACH(FREE);
321 #undef FREE
322 }
323