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(panel_ignore_lid, int, 0600,
 48	"Override lid status (0=autodetect, 1=autodetect disabled [default], "
 49	"-1=force lid closed, -2=force lid open)");
 50
 51i915_param_named_unsafe(enable_dc, int, 0400,
 52	"Enable power-saving display C-states. "
 53	"(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6)");
 54
 55i915_param_named_unsafe(enable_fbc, int, 0600,
 56	"Enable frame buffer compression for power savings "
 57	"(default: -1 (use per-chip default))");
 58
 59i915_param_named_unsafe(lvds_channel_mode, int, 0400,
 60	 "Specify LVDS channel mode "
 61	 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
 62
 63i915_param_named_unsafe(panel_use_ssc, int, 0600,
 64	"Use Spread Spectrum Clock with panels [LVDS/eDP] "
 65	"(default: auto from VBT)");
 66
 67i915_param_named_unsafe(vbt_sdvo_panel_type, int, 0400,
 68	"Override/Ignore selection of SDVO panel mode in the VBT "
 69	"(-2=ignore, -1=auto [default], index in VBT BIOS table)");
 70
 71i915_param_named_unsafe(reset, int, 0600,
 72	"Attempt GPU resets (0=disabled, 1=full gpu reset, 2=engine reset [default])");
 73
 74i915_param_named_unsafe(vbt_firmware, charp, 0400,
 75	"Load VBT from specified file under /lib/firmware");
 76
 77#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
 78i915_param_named(error_capture, bool, 0600,
 79	"Record the GPU state following a hang. "
 80	"This information in /sys/class/drm/card<N>/error is vital for "
 81	"triaging and debugging hangs.");
 82#endif
 83
 84i915_param_named_unsafe(enable_hangcheck, bool, 0644,
 85	"Periodically check GPU activity for detecting hangs. "
 86	"WARNING: Disabling this can cause system wide hangs. "
 87	"(default: true)");
 88
 89i915_param_named_unsafe(enable_ppgtt, int, 0400,
 90	"Override PPGTT usage. "
 91	"(-1=auto [default], 0=disabled, 1=aliasing, 2=full, 3=full with extended address space)");
 92
 93i915_param_named_unsafe(enable_psr, int, 0600,
 94	"Enable PSR "
 95	"(0=disabled, 1=enabled - link mode chosen per-platform, 2=force link-standby mode, 3=force link-off mode) "
 96	"Default: -1 (use per-chip default)");
 97
 98i915_param_named_unsafe(alpha_support, bool, 0400,
 99	"Enable alpha quality driver support for latest hardware. "
100	"See also CONFIG_DRM_I915_ALPHA_SUPPORT.");
101
102i915_param_named_unsafe(disable_power_well, int, 0400,
103	"Disable display power wells when possible "
104	"(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
105
106i915_param_named_unsafe(enable_ips, int, 0600, "Enable IPS (default: true)");
107
108i915_param_named(fastboot, bool, 0600,
109	"Try to skip unnecessary mode sets at boot time (default: false)");
110
111i915_param_named_unsafe(prefault_disable, bool, 0600,
112	"Disable page prefaulting for pread/pwrite/reloc (default:false). "
113	"For developers only.");
114
115i915_param_named_unsafe(load_detect_test, bool, 0600,
116	"Force-enable the VGA load detect code for testing (default:false). "
117	"For developers only.");
118
119i915_param_named_unsafe(force_reset_modeset_test, bool, 0600,
120	"Force a modeset during gpu reset for testing (default:false). "
121	"For developers only.");
122
123i915_param_named_unsafe(invert_brightness, int, 0600,
124	"Invert backlight brightness "
125	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
126	"report PCI device ID, subsystem vendor and subsystem device ID "
127	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
128	"It will then be included in an upcoming module version.");
129
130i915_param_named(disable_display, bool, 0400,
131	"Disable display (default: false)");
132
133i915_param_named_unsafe(enable_cmd_parser, bool, 0400,
134	"Enable command parsing (true=enabled [default], false=disabled)");
135
136i915_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
140i915_param_named(verbose_state_checks, bool, 0600,
141	"Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
142
143i915_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 */
147i915_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
152i915_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
157i915_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
161i915_param_named_unsafe(guc_firmware_path, charp, 0400,
162	"GuC firmware path to use instead of the default one");
163
164i915_param_named_unsafe(huc_firmware_path, charp, 0400,
165	"HuC firmware path to use instead of the default one");
166
167i915_param_named_unsafe(enable_dp_mst, bool, 0600,
168	"Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
169
170#if IS_ENABLED(CONFIG_DRM_I915_DEBUG)
171i915_param_named_unsafe(inject_load_failure, uint, 0400,
172	"Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
173#endif
174
175i915_param_named(enable_dpcd_backlight, bool, 0600,
176	"Enable support for DPCD backlight control (default:false)");
177
178i915_param_named(enable_gvt, bool, 0400,
179	"Enable support for Intel GVT-g graphics virtualization host support(default:false)");
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		BUILD_BUG();
196}
197
198/**
199 * i915_params_dump - dump i915 modparams
200 * @params: i915 modparams
201 * @p: the &drm_printer
202 *
203 * Pretty printer for i915 modparams.
204 */
205void i915_params_dump(const struct i915_params *params, struct drm_printer *p)
206{
207#define PRINT(T, x, ...) _print_param(p, #x, #T, &params->x);
208	I915_PARAMS_FOR_EACH(PRINT);
209#undef PRINT
210}