[PATCH 2/3] drm/i915: Extend PARAMS_FOR_EACH macro with more data

From: Michal Wajdeczko <michal.wajdeczko@intel.com>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH 2/3] drm/i915: Extend PARAMS_FOR_EACH macro with more data
Date: Thu,  8 Jun 2017 15:07:33 +0000	[thread overview]
Message-ID: <20170608150734.42296-3-michal.wajdeczko@intel.com> (raw)
In-Reply-To: <20170608150734.42296-1-michal.wajdeczko@intel.com>

Currently our PARAMS_FOR_EACH macro contains only param type and name.
We use this macro to define struct members, but later on we initialize
this struct using handcrafted code, which leads in some cases to use
mismatched value vs. type. Let's extend our root macro with param
default value to keep them in sync. Also drop ; from the macro to allow
more flexible usages.

v2: Add unsafe tag (Chris)
    Add all other data to allow complete automation (Michal)

As we now have all data in the param macro, we can automatically
add 'default' info to the description and avoid any mismatches.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_debugfs.c   |   6 +-
 drivers/gpu/drm/i915/i915_gpu_error.c |  10 +-
 drivers/gpu/drm/i915/i915_params.c    | 232 ++--------------------------------
 drivers/gpu/drm/i915/i915_params.h    | 181 ++++++++++++++++++++------
 4 files changed, 155 insertions(+), 274 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index a6ba210..7a2f0b8 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -44,9 +44,9 @@ static __always_inline void seq_print_param(struct seq_file *m,
 		seq_printf(m, "i915.%s=%s\n", name, yesno(*(const bool *)x));
 	else if (!__builtin_strcmp(type, "int"))
 		seq_printf(m, "i915.%s=%d\n", name, *(const int *)x);
-	else if (!__builtin_strcmp(type, "unsigned int"))
+	else if (!__builtin_strcmp(type, "uint"))
 		seq_printf(m, "i915.%s=%u\n", name, *(const unsigned int *)x);
-	else if (!__builtin_strcmp(type, "char *"))
+	else if (!__builtin_strcmp(type, "charp"))
 		seq_printf(m, "i915.%s=%s\n", name, *(const char **)x);
 	else
 		BUILD_BUG();
@@ -66,7 +66,7 @@ static int i915_capabilities(struct seq_file *m, void *data)
 #undef PRINT_FLAG
 
 	kernel_param_lock(THIS_MODULE);
-#define PRINT_PARAM(T, x) seq_print_param(m, #x, #T, &i915.x);
+#define PRINT_PARAM(T, X, V, M, S, B, D) seq_print_param(m, #X, #T, &i915.X);
 	I915_PARAMS_FOR_EACH(PRINT_PARAM);
 #undef PRINT_PARAM
 	kernel_param_unlock(THIS_MODULE);
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index e18f350..ea6c0b1 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -555,9 +555,9 @@ static __always_inline void err_print_param(struct drm_i915_error_state_buf *m,
 		err_printf(m, "i915.%s=%s\n", name, yesno(*(const bool *)x));
 	else if (!__builtin_strcmp(type, "int"))
 		err_printf(m, "i915.%s=%d\n", name, *(const int *)x);
-	else if (!__builtin_strcmp(type, "unsigned int"))
+	else if (!__builtin_strcmp(type, "uint"))
 		err_printf(m, "i915.%s=%u\n", name, *(const unsigned int *)x);
-	else if (!__builtin_strcmp(type, "char *"))
+	else if (!__builtin_strcmp(type, "charp"))
 		err_printf(m, "i915.%s=%s\n", name, *(const char **)x);
 	else
 		BUILD_BUG();
@@ -566,7 +566,7 @@ static __always_inline void err_print_param(struct drm_i915_error_state_buf *m,
 static void err_print_params(struct drm_i915_error_state_buf *m,
 			     const struct i915_params *p)
 {
-#define PRINT(T, x) err_print_param(m, #x, #T, &p->x);
+#define PRINT(T, X, V, M, S, B, D) err_print_param(m, #X, #T, &p->X);
 	I915_PARAMS_FOR_EACH(PRINT);
 #undef PRINT
 }
@@ -860,7 +860,7 @@ void __i915_gpu_state_free(struct kref *error_ref)
 	kfree(error->overlay);
 	kfree(error->display);
 
-#define FREE(T, x) free_param(#T, &error->params.x);
+#define FREE(T, X, V, M, S, B, D) free_param(#T, &error->params.X);
 	I915_PARAMS_FOR_EACH(FREE);
 #undef FREE
 
@@ -1694,7 +1694,7 @@ static int capture(void *data)
 					   error->i915->gt.last_init_time));
 
 	error->params = i915;
-#define DUP(T, x) dup_param(#T, &error->params.x);
+#define DUP(T, X, V, M, S, B, D) dup_param(#T, &error->params.X);
 	I915_PARAMS_FOR_EACH(DUP);
 #undef DUP
 
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 072aaaf..fb9984b 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -26,230 +26,14 @@
 #include "i915_drv.h"
 
 struct i915_params i915 __read_mostly = {
-	.modeset = -1,
-	.panel_ignore_lid = 1,
-	.semaphores = -1,
-	.lvds_channel_mode = 0,
-	.lvds_use_ssc = -1,
-	.vbt_sdvo_panel_type = -1,
-	.enable_rc6 = -1,
-	.enable_dc = -1,
-	.enable_fbc = -1,
-	.enable_execlists = -1,
-	.enable_hangcheck = true,
-	.enable_ppgtt = -1,
-	.enable_psr = -1,
-	.alpha_support = IS_ENABLED(CONFIG_DRM_I915_ALPHA_SUPPORT),
-	.disable_power_well = -1,
-	.enable_ips = 1,
-	.fastboot = 0,
-	.prefault_disable = 0,
-	.load_detect_test = 0,
-	.force_reset_modeset_test = 0,
-	.reset = true,
-	.error_capture = true,
-	.invert_brightness = 0,
-	.disable_display = 0,
-	.enable_cmd_parser = true,
-	.use_mmio_flip = 0,
-	.mmio_debug = 0,
-	.verbose_state_checks = 1,
-	.nuclear_pageflip = 0,
-	.edp_vswing = 0,
-	.enable_guc_loading = 0,
-	.enable_guc_submission = 0,
-	.guc_log_level = -1,
-	.guc_firmware_path = NULL,
-	.huc_firmware_path = NULL,
-	.enable_dp_mst = true,
-	.inject_load_failure = 0,
-	.enable_dpcd_backlight = false,
-	.enable_gvt = false,
+#define MEMBER(Type, Name, Value, Mode, Unsafe, Brief, Detailed) .Name = Value,
+	I915_PARAMS_FOR_EACH(MEMBER)
+#undef MEMBER
 };
 
-module_param_named(modeset, i915.modeset, int, 0400);
-MODULE_PARM_DESC(modeset,
-	"Use kernel modesetting [KMS] (0=disable, "
-	"1=on, -1=force vga console preference [default])");
+#define PARAM(Type, Name, Value, Mode, Unsafe, Brief, Detailed) \
+	module_param_named##Unsafe(Name, i915.Name, Type, Mode); \
+	MODULE_PARM_DESC(Name, "" Brief " " Detailed "[default: " #Value "]");
+I915_PARAMS_FOR_EACH(PARAM)
+#undef PARAM
 
-module_param_named_unsafe(panel_ignore_lid, i915.panel_ignore_lid, int, 0600);
-MODULE_PARM_DESC(panel_ignore_lid,
-	"Override lid status (0=autodetect, 1=autodetect disabled [default], "
-	"-1=force lid closed, -2=force lid open)");
-
-module_param_named_unsafe(semaphores, i915.semaphores, int, 0400);
-MODULE_PARM_DESC(semaphores,
-	"Use semaphores for inter-ring sync "
-	"(default: -1 (use per-chip defaults))");
-
-module_param_named_unsafe(enable_rc6, i915.enable_rc6, int, 0400);
-MODULE_PARM_DESC(enable_rc6,
-	"Enable power-saving render C-state 6. "
-	"Different stages can be selected via bitmask values "
-	"(0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6). "
-	"For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. "
-	"default: -1 (use per-chip default)");
-
-module_param_named_unsafe(enable_dc, i915.enable_dc, int, 0400);
-MODULE_PARM_DESC(enable_dc,
-	"Enable power-saving display C-states. "
-	"(-1=auto [default]; 0=disable; 1=up to DC5; 2=up to DC6)");
-
-module_param_named_unsafe(enable_fbc, i915.enable_fbc, int, 0600);
-MODULE_PARM_DESC(enable_fbc,
-	"Enable frame buffer compression for power savings "
-	"(default: -1 (use per-chip default))");
-
-module_param_named_unsafe(lvds_channel_mode, i915.lvds_channel_mode, int, 0400);
-MODULE_PARM_DESC(lvds_channel_mode,
-	 "Specify LVDS channel mode "
-	 "(0=probe BIOS [default], 1=single-channel, 2=dual-channel)");
-
-module_param_named_unsafe(lvds_use_ssc, i915.lvds_use_ssc, int, 0600);
-MODULE_PARM_DESC(lvds_use_ssc,
-	"Use Spread Spectrum Clock with panels [LVDS/eDP] "
-	"(default: auto from VBT)");
-
-module_param_named_unsafe(vbt_sdvo_panel_type, i915.vbt_sdvo_panel_type, int, 0400);
-MODULE_PARM_DESC(vbt_sdvo_panel_type,
-	"Override/Ignore selection of SDVO panel mode in the VBT "
-	"(-2=ignore, -1=auto [default], index in VBT BIOS table)");
-
-module_param_named_unsafe(reset, i915.reset, bool, 0600);
-MODULE_PARM_DESC(reset, "Attempt GPU resets (default: true)");
-
-#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
-module_param_named(error_capture, i915.error_capture, bool, 0600);
-MODULE_PARM_DESC(error_capture,
-	"Record the GPU state following a hang. "
-	"This information in /sys/class/drm/card<N>/error is vital for "
-	"triaging and debugging hangs.");
-#endif
-
-module_param_named_unsafe(enable_hangcheck, i915.enable_hangcheck, bool, 0644);
-MODULE_PARM_DESC(enable_hangcheck,
-	"Periodically check GPU activity for detecting hangs. "
-	"WARNING: Disabling this can cause system wide hangs. "
-	"(default: true)");
-
-module_param_named_unsafe(enable_ppgtt, i915.enable_ppgtt, int, 0400);
-MODULE_PARM_DESC(enable_ppgtt,
-	"Override PPGTT usage. "
-	"(-1=auto [default], 0=disabled, 1=aliasing, 2=full, 3=full with extended address space)");
-
-module_param_named_unsafe(enable_execlists, i915.enable_execlists, int, 0400);
-MODULE_PARM_DESC(enable_execlists,
-	"Override execlists usage. "
-	"(-1=auto [default], 0=disabled, 1=enabled)");
-
-module_param_named_unsafe(enable_psr, i915.enable_psr, int, 0600);
-MODULE_PARM_DESC(enable_psr, "Enable PSR "
-		 "(0=disabled, 1=enabled - link mode chosen per-platform, 2=force link-standby mode, 3=force link-off mode) "
-		 "Default: -1 (use per-chip default)");
-
-module_param_named_unsafe(alpha_support, i915.alpha_support, bool, 0400);
-MODULE_PARM_DESC(alpha_support,
-	"Enable alpha quality driver support for latest hardware. "
-	"See also CONFIG_DRM_I915_ALPHA_SUPPORT.");
-
-module_param_named_unsafe(disable_power_well, i915.disable_power_well, int, 0400);
-MODULE_PARM_DESC(disable_power_well,
-	"Disable display power wells when possible "
-	"(-1=auto [default], 0=power wells always on, 1=power wells disabled when possible)");
-
-module_param_named_unsafe(enable_ips, i915.enable_ips, int, 0600);
-MODULE_PARM_DESC(enable_ips, "Enable IPS (default: true)");
-
-module_param_named(fastboot, i915.fastboot, bool, 0600);
-MODULE_PARM_DESC(fastboot,
-	"Try to skip unnecessary mode sets at boot time (default: false)");
-
-module_param_named_unsafe(prefault_disable, i915.prefault_disable, bool, 0600);
-MODULE_PARM_DESC(prefault_disable,
-	"Disable page prefaulting for pread/pwrite/reloc (default:false). "
-	"For developers only.");
-
-module_param_named_unsafe(load_detect_test, i915.load_detect_test, bool, 0600);
-MODULE_PARM_DESC(load_detect_test,
-	"Force-enable the VGA load detect code for testing (default:false). "
-	"For developers only.");
-
-module_param_named_unsafe(force_reset_modeset_test, i915.force_reset_modeset_test, bool, 0600);
-MODULE_PARM_DESC(force_reset_modeset_test,
-	"Force a modeset during gpu reset for testing (default:false). "
-	"For developers only.");
-
-module_param_named_unsafe(invert_brightness, i915.invert_brightness, int, 0600);
-MODULE_PARM_DESC(invert_brightness,
-	"Invert backlight brightness "
-	"(-1 force normal, 0 machine defaults, 1 force inversion), please "
-	"report PCI device ID, subsystem vendor and subsystem device ID "
-	"to dri-devel@lists.freedesktop.org, if your machine needs it. "
-	"It will then be included in an upcoming module version.");
-
-module_param_named(disable_display, i915.disable_display, bool, 0400);
-MODULE_PARM_DESC(disable_display, "Disable display (default: false)");
-
-module_param_named_unsafe(enable_cmd_parser, i915.enable_cmd_parser, bool, 0400);
-MODULE_PARM_DESC(enable_cmd_parser,
-		 "Enable command parsing (true=enabled [default], false=disabled)");
-
-module_param_named_unsafe(use_mmio_flip, i915.use_mmio_flip, int, 0600);
-MODULE_PARM_DESC(use_mmio_flip,
-		 "use MMIO flips (-1=never, 0=driver discretion [default], 1=always)");
-
-module_param_named(mmio_debug, i915.mmio_debug, int, 0600);
-MODULE_PARM_DESC(mmio_debug,
-	"Enable the MMIO debug code for the first N failures (default: off). "
-	"This may negatively affect performance.");
-
-module_param_named(verbose_state_checks, i915.verbose_state_checks, bool, 0600);
-MODULE_PARM_DESC(verbose_state_checks,
-	"Enable verbose logs (ie. WARN_ON()) in case of unexpected hw state conditions.");
-
-module_param_named_unsafe(nuclear_pageflip, i915.nuclear_pageflip, bool, 0400);
-MODULE_PARM_DESC(nuclear_pageflip,
-		 "Force enable atomic functionality on platforms that don't have full support yet.");
-
-/* WA to get away with the default setting in VBT for early platforms.Will be removed */
-module_param_named_unsafe(edp_vswing, i915.edp_vswing, int, 0400);
-MODULE_PARM_DESC(edp_vswing,
-		 "Ignore/Override vswing pre-emph table selection from VBT "
-		 "(0=use value from vbt [default], 1=low power swing(200mV),"
-		 "2=default swing(400mV))");
-
-module_param_named_unsafe(enable_guc_loading, i915.enable_guc_loading, int, 0400);
-MODULE_PARM_DESC(enable_guc_loading,
-		"Enable GuC firmware loading "
-		"(-1=auto, 0=never [default], 1=if available, 2=required)");
-
-module_param_named_unsafe(enable_guc_submission, i915.enable_guc_submission, int, 0400);
-MODULE_PARM_DESC(enable_guc_submission,
-		"Enable GuC submission "
-		"(-1=auto, 0=never [default], 1=if available, 2=required)");
-
-module_param_named(guc_log_level, i915.guc_log_level, int, 0400);
-MODULE_PARM_DESC(guc_log_level,
-	"GuC firmware logging level (-1:disabled (default), 0-3:enabled)");
-
-module_param_named_unsafe(guc_firmware_path, i915.guc_firmware_path, charp, 0400);
-MODULE_PARM_DESC(guc_firmware_path,
-	"GuC firmware path to use instead of the default one");
-
-module_param_named_unsafe(huc_firmware_path, i915.huc_firmware_path, charp, 0400);
-MODULE_PARM_DESC(huc_firmware_path,
-	"HuC firmware path to use instead of the default one");
-
-module_param_named_unsafe(enable_dp_mst, i915.enable_dp_mst, bool, 0600);
-MODULE_PARM_DESC(enable_dp_mst,
-	"Enable multi-stream transport (MST) for new DisplayPort sinks. (default: true)");
-module_param_named_unsafe(inject_load_failure, i915.inject_load_failure, uint, 0400);
-MODULE_PARM_DESC(inject_load_failure,
-	"Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
-module_param_named(enable_dpcd_backlight, i915.enable_dpcd_backlight, bool, 0600);
-MODULE_PARM_DESC(enable_dpcd_backlight,
-	"Enable support for DPCD backlight control (default:false)");
-
-module_param_named(enable_gvt, i915.enable_gvt, bool, 0400);
-MODULE_PARM_DESC(enable_gvt,
-	"Enable support for Intel GVT-g graphics virtualization host support(default:false)");
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 5fa62c2..ef7e350 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -27,53 +27,150 @@
 
 #include <linux/cache.h> /* for __read_mostly */
 
-#define I915_PARAMS_FOR_EACH(func) \
-	func(int, modeset); \
-	func(int, panel_ignore_lid); \
-	func(int, semaphores); \
-	func(int, lvds_channel_mode); \
-	func(int, lvds_use_ssc); \
-	func(int, vbt_sdvo_panel_type); \
-	func(int, enable_rc6); \
-	func(int, enable_dc); \
-	func(int, enable_fbc); \
-	func(int, enable_ppgtt); \
-	func(int, enable_execlists); \
-	func(int, enable_psr); \
-	func(int, disable_power_well); \
-	func(int, enable_ips); \
-	func(int, invert_brightness); \
-	func(int, enable_guc_loading); \
-	func(int, enable_guc_submission); \
-	func(int, guc_log_level); \
-	func(char *, guc_firmware_path); \
-	func(char *, huc_firmware_path); \
-	func(int, use_mmio_flip); \
-	func(int, mmio_debug); \
-	func(int, edp_vswing); \
-	func(unsigned int, inject_load_failure); \
+/*
+ * Each i915 params is defined as single 'func' entry:
+ *	func(Type, Name, Value, Mode, Unsafe, Brief, Detailed)
+ * where:
+ *	@Type: int|uint|bool|charp
+ *	@Name: the name of param
+ *	@Value: the default value of the param
+ *	@Mode: the access mode (usually 0600|0400)
+ *	@Unsafe: must be either empty or _unsafe
+ *	@Brief: short description text of the param
+ *	@Detailed: more detailed description of the param (may be empty)
+ */
+#define _I915_PARAMS_FOR_EACH_BASE(func) \
+	func(int, modeset, -1, 0400, , \
+	     "Use kernel modesetting (KMS).", \
+	     "(0=disable, 1=on, -1=force vga console preference)") \
+	func(int, panel_ignore_lid, 1, 0600, _unsafe, \
+	     "Override lid status.", \
+	     "(0=autodetect, 1=autodetect disabled, -1=force lid closed, -2=force lid open)") \
+	func(int, semaphores, -1, 0400, _unsafe, \
+	     "Use semaphores for inter-ring sync.", \
+	     "(-1=use per-chip defaults)") \
+	func(int, lvds_channel_mode, 0, 0400, _unsafe, \
+	     "Specify LVDS channel mode.", \
+	     "(0=probe BIOS, 1=single-channel, 2=dual-channel)") \
+	func(int, lvds_use_ssc, -1, 0600, _unsafe, \
+	     "Use Spread Spectrum Clock with panels [LVDS/eDP].", \
+	     "(-1=auto from VBT)") \
+	func(int, vbt_sdvo_panel_type, -1, 0400, _unsafe, \
+	     "Override/Ignore selection of SDVO panel mode in the VBT.", \
+	     "(-2=ignore, -1=auto, 0..n=index in VBT BIOS table)") \
+	func(int, enable_rc6, -1, 0400, _unsafe, \
+	     "Enable power-saving render C-state 6.", \
+	     "(-1=use per-chip default; 0 = disable; 1 = enable rc6; 2 = enable deep rc6; 4 = enable deepest rc6)" \
+	     "Different stages can be selected via bitmask values. " \
+	     "For example, 3 would enable rc6 and deep rc6, and 7 would enable everything. ") \
+	func(int, enable_dc, -1, 0400, _unsafe, \
+	     "Enable power-saving display C-states.", \
+	     "(-1=auto; 0=disable; 1=up to DC5; 2=up to DC6)") \
+	func(int, enable_fbc, -1, 0600, _unsafe, \
+	     "Enable frame buffer compression for power savings.", \
+	     "(-1=use per-chip default)") \
+	func(int, enable_ppgtt, -1, 0400, _unsafe, \
+	     "Override PPGTT usage.", \
+	     "(-1=auto, 0=disabled, 1=aliasing, 2=full, 3=full with extended address space)") \
+	func(int, enable_execlists, -1, 0400, _unsafe, \
+	     "Override execlists usage.", \
+	     "(-1=auto, 0=disabled, 1=enabled)") \
+	func(int, enable_psr, -1, 0600, _unsafe, \
+	     "Enable PSR.", \
+	     "(-1=use per-chip default, 0=disabled," \
+	     "1=link mode chosen per-platform, " \
+	     "2=force link-standby mode, " \
+	     "3=force link-off mode)") \
+	func(int, disable_power_well, -1, 0400, _unsafe, \
+	     "Disable display power wells when possible.", \
+	     "(-1=auto, 0=power wells always on, 1=power wells disabled when possible)") \
+	func(int, enable_ips, 1, 0600, _unsafe, \
+	     "Enable IPS.", ) \
+	func(int, invert_brightness, 0, 0600, _unsafe, \
+	     "Invert backlight brightness.", \
+	     "Please report PCI device ID, subsystem vendor and subsystem " \
+	     "device ID to dri-devel@lists.freedesktop.org, if your machine " \
+	     "needs it. It will then be included in an upcoming module version. " \
+	     "(-1=force normal, 0=machine defaults, 1=force inversion)") \
+	func(int, enable_guc_loading, 0, 0400, _unsafe, \
+	     "Enable GuC firmware loading.", \
+	     "(-1=auto, 0=never, 1=if available, 2=required)") \
+	func(int, enable_guc_submission, 0, 0400, _unsafe, \
+	     "Enable GuC submission.", \
+	     "(-1=auto, 0=never, 1=if available, 2=required)") \
+	func(int, guc_log_level, -1, 0400, _unsafe, \
+	     "GuC firmware logging level.", \
+	     "(-1:disabled, 0-3:enabled)") \
+	func(charp, guc_firmware_path, NULL, 0400, _unsafe, \
+	     "GuC firmware path to use instead of the default one.", ) \
+	func(charp, huc_firmware_path, NULL, 0400, _unsafe, \
+	     "HuC firmware path to use instead of the default one.", ) \
+	func(int, use_mmio_flip, 0, 0600, _unsafe, \
+	     "Use MMIO flips.", \
+	     "(-1=never, 0=driver discretion, 1=always)") \
+	func(int, mmio_debug, 0, 0600, , \
+	     "Enable the MMIO debug code for the first N failures.", \
+	     "This may negatively affect performance. ") \
+	func(int, edp_vswing, 0, 0400, _unsafe, \
+	     "Ignore/Override vswing pre-emph table selection from VBT.", \
+	     "(0=use value from VBT, 1=low power swing(200mV), 2=default swing(400mV))") \
+	func(uint, inject_load_failure, 0, 0400, _unsafe, \
+	     "For developers only: Force an error after a number of failure check points.", \
+	     "(0:disabled, N:force failure at the Nth failure check point)") \
 	/* leave bools at the end to not create holes */ \
-	func(bool, alpha_support); \
-	func(bool, enable_cmd_parser); \
-	func(bool, enable_hangcheck); \
-	func(bool, fastboot); \
-	func(bool, prefault_disable); \
-	func(bool, load_detect_test); \
-	func(bool, force_reset_modeset_test); \
-	func(bool, reset); \
-	func(bool, error_capture); \
-	func(bool, disable_display); \
-	func(bool, verbose_state_checks); \
-	func(bool, nuclear_pageflip); \
-	func(bool, enable_dp_mst); \
-	func(bool, enable_dpcd_backlight); \
-	func(bool, enable_gvt)
+	func(bool, alpha_support, IS_ENABLED(CONFIG_DRM_I915_ALPHA_SUPPORT), 0400, _unsafe, \
+	     "Enable alpha quality driver support for latest hardware.", ) \
+	func(bool, enable_cmd_parser, true, 0400, _unsafe, \
+	     "Enable command parsing.", \
+	     "(true=enabled, false=disabled)") \
+	func(bool, enable_hangcheck, true, 0644, _unsafe, \
+	     "Periodically check GPU activity for detecting hangs.", \
+	     "WARNING: Disabling this can cause system wide hangs! ") \
+	func(bool, fastboot, false, 0600, , \
+	     "Try to skip unnecessary mode sets at boot time.", ) \
+	func(bool, prefault_disable, false, 0600, _unsafe, \
+	     "For developers only: Disable page prefaulting for pread/pwrite/reloc.", ) \
+	func(bool, load_detect_test, false, 0600, _unsafe, \
+	     "For developers only: Force-enable the VGA load detect code for testing.", ) \
+	func(bool, force_reset_modeset_test, false, 0600, _unsafe, \
+	     "For developers only: Force a modeset during gpu reset for testing.", ) \
+	func(bool, reset, true, 0600, _unsafe, \
+	     "Attempt GPU resets.", ) \
+	func(bool, disable_display, false, 0400, , \
+	     "Disable display.", ) \
+	func(bool, verbose_state_checks, true, 0600, , \
+	     "Enable verbose logs (ie. WARN_ON()) in case of unexpected HW state conditions.", ) \
+	func(bool, nuclear_pageflip, false, 0400, _unsafe, \
+	     "Force enable atomic functionality on platforms that don't have full support yet.", ) \
+	func(bool, enable_dp_mst, true, 0600, _unsafe, \
+	     "Enable multi-stream transport (MST) for new DisplayPort sinks.", ) \
+	func(bool, enable_dpcd_backlight, false, 0600, , \
+	     "Enable support for DPCD backlight control.", ) \
+	func(bool, enable_gvt, false, 0400, , \
+	     "Enable support for Intel GVT-g graphics virtualization host support.", ) \
+	/* consume \ */
+
+#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
+#define _I915_PARAMS_FOR_EACH_CONFIG_ERROR(func) \
+	func(bool, error_capture, true, 0600, , \
+	     "Record the GPU state following a hang.", \
+	     "This information in /sys/class/drm/card<N>/error is vital for triaging and debugging hangs. ")
+#else
+#define _I915_PARAMS_FOR_EACH_CONFIG_ERROR(func)
+#endif
+
+#define I915_PARAMS_FOR_EACH(func) \
+	_I915_PARAMS_FOR_EACH_BASE(func) \
+	_I915_PARAMS_FOR_EACH_CONFIG_ERROR(func) \
+	/* consume \ */
 
-#define MEMBER(T, member) T member
+#define charp char*
+#define MEMBER(Type, Name, Value, Mode, Unsafe, Brief, Detailed) Type Name;
 struct i915_params {
-	I915_PARAMS_FOR_EACH(MEMBER);
+	I915_PARAMS_FOR_EACH(MEMBER)
 };
 #undef MEMBER
+#undef charp
 
 extern struct i915_params i915 __read_mostly;
 
-- 
2.7.4

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