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(force_probe, charp, 0400,
125 	"Force probe the driver for specified devices. "
126 	"See CONFIG_DRM_I915_FORCE_PROBE for details.");
127 
128 i915_param_named_unsafe(disable_power_well, int, 0400,
129 	"Disable display power wells when possible "
130 	"(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
131 
132 i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)");
133 
134 i915_param_named(fastboot, int, 0400,
135 	"Try to skip unnecessary mode sets at boot time "
136 	"(0=disabled, 1=enabled) "
137 	"Default: -1 (use per-chip default)");
138 
139 i915_param_named_unsafe(load_detect_test, bool, 0400,
140 	"Force-enable the VGA load detect code for testing (default:false). "
141 	"For developers only.");
142 
143 i915_param_named_unsafe(force_reset_modeset_test, bool, 0400,
144 	"Force a modeset during gpu reset for testing (default:false). "
145 	"For developers only.");
146 
147 i915_param_named_unsafe(invert_brightness, int, 0400,
148 	"Invert backlight brightness "
149 	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
150 	"report PCI device ID, subsystem vendor and subsystem device ID "
151 	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
152 	"It will then be included in an upcoming module version.");
153 
154 i915_param_named(disable_display, bool, 0400,
155 	"Disable display (default: false)");
156 
157 i915_param_named(memtest, bool, 0400,
158 	"Perform a read/write test of all device memory on module load (default: off)");
159 
160 i915_param_named(mmio_debug, int, 0400,
161 	"Enable the MMIO debug code for the first N failures (default: off). "
162 	"This may negatively affect performance.");
163 
164 /* Special case writable file */
165 i915_param_named(verbose_state_checks, bool, 0600,
166 	"Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
167 
168 i915_param_named_unsafe(nuclear_pageflip, bool, 0400,
169 	"Force enable atomic functionality on platforms that don't have full support yet.");
170 
171 /* WA to get away with the default setting in VBT for early platforms.Will be removed */
172 i915_param_named_unsafe(edp_vswing, int, 0400,
173 	"Ignore/Override vswing pre-emph table selection from VBT "
174 	"(0=use value from vbt [default], 1=low power swing(200mV),"
175 	"2=default swing(400mV))");
176 
177 i915_param_named_unsafe(enable_guc, int, 0400,
178 	"Enable GuC load for GuC submission and/or HuC load. "
179 	"Required functionality can be selected using bitmask values. "
180 	"(-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load)");
181 
182 i915_param_named(guc_log_level, int, 0400,
183 	"GuC firmware logging level. Requires GuC to be loaded. "
184 	"(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)");
185 
186 i915_param_named_unsafe(guc_firmware_path, charp, 0400,
187 	"GuC firmware path to use instead of the default one");
188 
189 i915_param_named_unsafe(huc_firmware_path, charp, 0400,
190 	"HuC firmware path to use instead of the default one");
191 
192 i915_param_named_unsafe(dmc_firmware_path, charp, 0400,
193 	"DMC firmware path to use instead of the default one");
194 
195 i915_param_named_unsafe(enable_dp_mst, bool, 0400,
196 	"Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
197 
198 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
199 i915_param_named_unsafe(inject_probe_failure, uint, 0400,
200 	"Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
201 #endif
202 
203 i915_param_named(enable_dpcd_backlight, int, 0400,
204 	"Enable support for DPCD backlight control"
205 	"(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)");
206 
207 #if IS_ENABLED(CONFIG_DRM_I915_GVT)
208 i915_param_named(enable_gvt, bool, 0400,
209 	"Enable support for Intel GVT-g graphics virtualization host support(default:false)");
210 #endif
211 
212 #if CONFIG_DRM_I915_REQUEST_TIMEOUT
213 i915_param_named_unsafe(request_timeout_ms, uint, 0600,
214 			"Default request/fence/batch buffer expiration timeout.");
215 #endif
216 
217 i915_param_named_unsafe(lmem_size, uint, 0400,
218 			"Set the lmem size(in MiB) for each region. (default: 0, all memory)");
219 i915_param_named_unsafe(lmem_bar_size, uint, 0400,
220 			"Set the lmem bar size(in MiB).");
221 
_print_param(struct drm_printer * p,const char * name,const char * type,const void * x)222 static __always_inline void _print_param(struct drm_printer *p,
223 					 const char *name,
224 					 const char *type,
225 					 const void *x)
226 {
227 	if (!__builtin_strcmp(type, "bool"))
228 		drm_printf(p, "i915.%s=%s\n", name,
229 			   str_yes_no(*(const bool *)x));
230 	else if (!__builtin_strcmp(type, "int"))
231 		drm_printf(p, "i915.%s=%d\n", name, *(const int *)x);
232 	else if (!__builtin_strcmp(type, "unsigned int"))
233 		drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x);
234 	else if (!__builtin_strcmp(type, "unsigned long"))
235 		drm_printf(p, "i915.%s=%lu\n", name, *(const unsigned long *)x);
236 	else if (!__builtin_strcmp(type, "char *"))
237 		drm_printf(p, "i915.%s=%s\n", name, *(const char **)x);
238 	else
239 		WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n",
240 			  type, name);
241 }
242 
243 /**
244  * i915_params_dump - dump i915 modparams
245  * @params: i915 modparams
246  * @p: the &drm_printer
247  *
248  * Pretty printer for i915 modparams.
249  */
i915_params_dump(const struct i915_params * params,struct drm_printer * p)250 void i915_params_dump(const struct i915_params *params, struct drm_printer *p)
251 {
252 #define PRINT(T, x, ...) _print_param(p, #x, #T, &params->x);
253 	I915_PARAMS_FOR_EACH(PRINT);
254 #undef PRINT
255 }
256 
dup_param(const char * type,void * x)257 static __always_inline void dup_param(const char *type, void *x)
258 {
259 	if (!__builtin_strcmp(type, "char *"))
260 		*(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
261 }
262 
i915_params_copy(struct i915_params * dest,const struct i915_params * src)263 void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
264 {
265 	*dest = *src;
266 #define DUP(T, x, ...) dup_param(#T, &dest->x);
267 	I915_PARAMS_FOR_EACH(DUP);
268 #undef DUP
269 }
270 
free_param(const char * type,void * x)271 static __always_inline void free_param(const char *type, void *x)
272 {
273 	if (!__builtin_strcmp(type, "char *")) {
274 		kfree(*(void **)x);
275 		*(void **)x = NULL;
276 	}
277 }
278 
279 /* free the allocated members, *not* the passed in params itself */
i915_params_free(struct i915_params * params)280 void i915_params_free(struct i915_params *params)
281 {
282 #define FREE(T, x, ...) free_param(#T, &params->x);
283 	I915_PARAMS_FOR_EACH(FREE);
284 #undef FREE
285 }
286