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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
37struct 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
43i915_param_named(modeset, int, 0400,
44 "Use kernel modesetting [KMS] (0=disable, "
45 "1=on, -1=force vga console preference [default])");
46
47i915_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
51i915_param_named_unsafe(enable_fbc, int, 0600,
52 "Enable frame buffer compression for power savings "
53 "(default: -1 (use per-chip default))");
54
55i915_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
59i915_param_named_unsafe(panel_use_ssc, int, 0600,
60 "Use Spread Spectrum Clock with panels [LVDS/eDP] "
61 "(default: auto from VBT)");
62
63i915_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
67i915_param_named_unsafe(reset, int, 0600,
68 "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])");
69
70i915_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)
74i915_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
80i915_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
85i915_param_named_unsafe(enable_psr, int, 0600,
86 "Enable PSR "
87 "(0=disabled, 1=enabled) "
88 "Default: -1 (use per-chip default)");
89
90i915_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
94i915_param_named_unsafe(alpha_support, bool, 0400,
95 "Deprecated. See i915.force_probe.");
96
97i915_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
101i915_param_named_unsafe(enable_ips, int, 0600, "Enable IPS (default: true)");
102
103i915_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
108i915_param_named_unsafe(prefault_disable, bool, 0600,
109 "Disable page prefaulting for pread/pwrite/reloc (default:false). "
110 "For developers only.");
111
112i915_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
116i915_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
120i915_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
127i915_param_named(disable_display, bool, 0400,
128 "Disable display (default: false)");
129
130i915_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
134i915_param_named(verbose_state_checks, bool, 0600,
135 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
136
137i915_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 */
141i915_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
146i915_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
151i915_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
155i915_param_named_unsafe(guc_firmware_path, charp, 0400,
156 "GuC firmware path to use instead of the default one");
157
158i915_param_named_unsafe(huc_firmware_path, charp, 0400,
159 "HuC firmware path to use instead of the default one");
160
161i915_param_named_unsafe(dmc_firmware_path, charp, 0400,
162 "DMC firmware path to use instead of the default one");
163
164i915_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)
168i915_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
172i915_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)
177i915_param_named(enable_gvt, bool, 0400,
178 "Enable support for Intel GVT-g graphics virtualization host support(default:false)");
179#endif
180
181static __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 */
206void 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
213static __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
219void 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
227static __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 */
236void 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}