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@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
_print_param(struct drm_printer * p,const char * name,const char * type,const void * x)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 */
i915_params_dump(const struct i915_params * params,struct drm_printer * p)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
dup_param(const char * type,void * x)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
i915_params_copy(struct i915_params * dest,const struct i915_params * src)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
free_param(const char * type,void * x)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 */
i915_params_free(struct i915_params * params)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