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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
43/*
44 * Note: As a rule, keep module parameter sysfs permissions read-only
45 * 0400. Runtime changes are only supported through i915 debugfs.
46 *
47 * For any exceptions requiring write access and runtime changes through module
48 * parameter sysfs, prevent debugfs file creation by setting the parameter's
49 * debugfs mode to 0.
50 */
51
52i915_param_named(modeset, int, 0400,
53 "Use kernel modesetting [KMS] (0=disable, "
54 "1=on, -1=force vga console preference [default])");
55
56i915_param_named_unsafe(enable_dc, int, 0400,
57 "Enable power-saving display C-states. "
58 "(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6; "
59 "3=up to DC5 with DC3CO; 4=up to DC6 with DC3CO)");
60
61i915_param_named_unsafe(enable_fbc, int, 0400,
62 "Enable frame buffer compression for power savings "
63 "(default: -1 (use per-chip default))");
64
65i915_param_named_unsafe(lvds_channel_mode, int, 0400,
66 "Specify LVDS channel mode "
67 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
68
69i915_param_named_unsafe(panel_use_ssc, int, 0400,
70 "Use Spread Spectrum Clock with panels [LVDS/eDP] "
71 "(default: auto from VBT)");
72
73i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400,
74 "Override/Ignore selection of SDVO panel mode in the VBT "
75 "(-2=ignore, -1=auto [default], index in VBT BIOS table)");
76
77i915_param_named_unsafe(reset, uint, 0400,
78 "Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])");
79
80i915_param_named_unsafe(vbt_firmware, charp, 0400,
81 "Load VBT from specified file under /lib/firmware");
82
83#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
84i915_param_named(error_capture, bool, 0400,
85 "Record the GPU state following a hang. "
86 "This information in /sys/class/drm/card<N>/error is vital for "
87 "triaging and debugging hangs.");
88#endif
89
90i915_param_named_unsafe(enable_hangcheck, bool, 0400,
91 "Periodically check GPU activity for detecting hangs. "
92 "WARNING: Disabling this can cause system wide hangs. "
93 "(default: true)");
94
95i915_param_named_unsafe(enable_psr, int, 0400,
96 "Enable PSR "
97 "(0=disabled, 1=enabled) "
98 "Default: -1 (use per-chip default)");
99
100i915_param_named(psr_safest_params, bool, 0400,
101 "Replace PSR VBT parameters by the safest and not optimal ones. This "
102 "is helpful to detect if PSR issues are related to bad values set in "
103 " VBT. (0=use VBT parameters, 1=use safest parameters)");
104
105i915_param_named_unsafe(enable_psr2_sel_fetch, bool, 0400,
106 "Enable PSR2 selective fetch "
107 "(0=disabled, 1=enabled) "
108 "Default: 0");
109
110i915_param_named_unsafe(force_probe, charp, 0400,
111 "Force probe the driver for specified devices. "
112 "See CONFIG_DRM_I915_FORCE_PROBE for details.");
113
114i915_param_named_unsafe(disable_power_well, int, 0400,
115 "Disable display power wells when possible "
116 "(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
117
118i915_param_named_unsafe(enable_ips, int, 0400, "Enable IPS (default: true)");
119
120i915_param_named(fastboot, int, 0400,
121 "Try to skip unnecessary mode sets at boot time "
122 "(0=disabled, 1=enabled) "
123 "Default: -1 (use per-chip default)");
124
125i915_param_named_unsafe(load_detect_test, bool, 0400,
126 "Force-enable the VGA load detect code for testing (default:false). "
127 "For developers only.");
128
129i915_param_named_unsafe(force_reset_modeset_test, bool, 0400,
130 "Force a modeset during gpu reset for testing (default:false). "
131 "For developers only.");
132
133i915_param_named_unsafe(invert_brightness, int, 0400,
134 "Invert backlight brightness "
135 "(-1 force normal, 0 machine defaults, 1 force inversion), please "
136 "report PCI device ID, subsystem vendor and subsystem device ID "
137 "to dri-devel@lists.freedesktop.org, if your machine needs it. "
138 "It will then be included in an upcoming module version.");
139
140i915_param_named(disable_display, bool, 0400,
141 "Disable display (default: false)");
142
143i915_param_named(mmio_debug, int, 0400,
144 "Enable the MMIO debug code for the first N failures (default: off). "
145 "This may negatively affect performance.");
146
147/* Special case writable file */
148i915_param_named(verbose_state_checks, bool, 0600,
149 "Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
150
151i915_param_named_unsafe(nuclear_pageflip, bool, 0400,
152 "Force enable atomic functionality on platforms that don't have full support yet.");
153
154/* WA to get away with the default setting in VBT for early platforms.Will be removed */
155i915_param_named_unsafe(edp_vswing, int, 0400,
156 "Ignore/Override vswing pre-emph table selection from VBT "
157 "(0=use value from vbt [default], 1=low power swing(200mV),"
158 "2=default swing(400mV))");
159
160i915_param_named_unsafe(enable_guc, int, 0400,
161 "Enable GuC load for GuC submission and/or HuC load. "
162 "Required functionality can be selected using bitmask values. "
163 "(-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load)");
164
165i915_param_named(guc_log_level, int, 0400,
166 "GuC firmware logging level. Requires GuC to be loaded. "
167 "(-1=auto [default], 0=disable, 1..4=enable with verbosity min..max)");
168
169i915_param_named_unsafe(guc_firmware_path, charp, 0400,
170 "GuC firmware path to use instead of the default one");
171
172i915_param_named_unsafe(huc_firmware_path, charp, 0400,
173 "HuC firmware path to use instead of the default one");
174
175i915_param_named_unsafe(dmc_firmware_path, charp, 0400,
176 "DMC firmware path to use instead of the default one");
177
178i915_param_named_unsafe(enable_dp_mst, bool, 0400,
179 "Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
180
181#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
182i915_param_named_unsafe(inject_probe_failure, uint, 0400,
183 "Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
184#endif
185
186i915_param_named(enable_dpcd_backlight, int, 0400,
187 "Enable support for DPCD backlight control"
188 "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)");
189
190#if IS_ENABLED(CONFIG_DRM_I915_GVT)
191i915_param_named(enable_gvt, bool, 0400,
192 "Enable support for Intel GVT-g graphics virtualization host support(default:false)");
193#endif
194
195#if IS_ENABLED(CONFIG_DRM_I915_UNSTABLE_FAKE_LMEM)
196i915_param_named_unsafe(fake_lmem_start, ulong, 0400,
197 "Fake LMEM start offset (default: 0)");
198#endif
199
200#if CONFIG_DRM_I915_REQUEST_TIMEOUT
201i915_param_named_unsafe(request_timeout_ms, uint, 0600,
202 "Default request/fence/batch buffer expiration timeout.");
203#endif
204
205static __always_inline void _print_param(struct drm_printer *p,
206 const char *name,
207 const char *type,
208 const void *x)
209{
210 if (!__builtin_strcmp(type, "bool"))
211 drm_printf(p, "i915.%s=%s\n", name, yesno(*(const bool *)x));
212 else if (!__builtin_strcmp(type, "int"))
213 drm_printf(p, "i915.%s=%d\n", name, *(const int *)x);
214 else if (!__builtin_strcmp(type, "unsigned int"))
215 drm_printf(p, "i915.%s=%u\n", name, *(const unsigned int *)x);
216 else if (!__builtin_strcmp(type, "unsigned long"))
217 drm_printf(p, "i915.%s=%lu\n", name, *(const unsigned long *)x);
218 else if (!__builtin_strcmp(type, "char *"))
219 drm_printf(p, "i915.%s=%s\n", name, *(const char **)x);
220 else
221 WARN_ONCE(1, "no printer defined for param type %s (i915.%s)\n",
222 type, name);
223}
224
225/**
226 * i915_params_dump - dump i915 modparams
227 * @params: i915 modparams
228 * @p: the &drm_printer
229 *
230 * Pretty printer for i915 modparams.
231 */
232void i915_params_dump(const struct i915_params *params, struct drm_printer *p)
233{
234#define PRINT(T, x, ...) _print_param(p, #x, #T, ¶ms->x);
235 I915_PARAMS_FOR_EACH(PRINT);
236#undef PRINT
237}
238
239static __always_inline void dup_param(const char *type, void *x)
240{
241 if (!__builtin_strcmp(type, "char *"))
242 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
243}
244
245void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
246{
247 *dest = *src;
248#define DUP(T, x, ...) dup_param(#T, &dest->x);
249 I915_PARAMS_FOR_EACH(DUP);
250#undef DUP
251}
252
253static __always_inline void free_param(const char *type, void *x)
254{
255 if (!__builtin_strcmp(type, "char *")) {
256 kfree(*(void **)x);
257 *(void **)x = NULL;
258 }
259}
260
261/* free the allocated members, *not* the passed in params itself */
262void i915_params_free(struct i915_params *params)
263{
264#define FREE(T, x, ...) free_param(#T, ¶ms->x);
265 I915_PARAMS_FOR_EACH(FREE);
266#undef FREE
267}