drm/i915: Extend I915_PARAMS_FOR_EACH with default member value

By combining default value into helper macro we can initialize
modparams struct in the same automatic way as it was declared.
This will initialize members in the same order as declared
and additionally will disallow declaring new member without
proper default value for it.

v2: make MEMBER macro more robust (Joonas)
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170925105008.46060-2-michal.wajdeczko@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -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_modparams.x);
+#define PRINT_PARAM(T, x, ...) seq_print_param(m, #x, #T, &i915_modparams.x);
 	I915_PARAMS_FOR_EACH(PRINT_PARAM);
 #undef PRINT_PARAM
 	kernel_param_unlock(THIS_MODULE);

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -572,7 +572,7 @@ 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, ...) err_print_param(m, #x, #T, &p->x);
 	I915_PARAMS_FOR_EACH(PRINT);
 #undef PRINT
 }
@@ -866,7 +866,7 @@ 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, ...) free_param(#T, &error->params.x);
 	I915_PARAMS_FOR_EACH(FREE);
 #undef FREE
 
@@ -1704,7 +1704,7 @@ static int capture(void *data)
 					   error->i915->gt.last_init_time));
 
 	error->params = i915_modparams;
-#define DUP(T, x) dup_param(#T, &error->params.x);
+#define DUP(T, x, ...) dup_param(#T, &error->params.x);
 	I915_PARAMS_FOR_EACH(DUP);
 #undef DUP
 

drivers/gpu/drm/i915/i915_params.c

@@ -33,45 +33,9 @@
 	MODULE_PARM_DESC(name, desc)
 
 struct i915_params i915_modparams __read_mostly = {
-	.modeset = -1,
-	.panel_ignore_lid = 1,
-	.semaphores = -1,
-	.lvds_channel_mode = 0,
-	.panel_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 = 2,
-	.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(T, member, value) .member = (value),
+	I915_PARAMS_FOR_EACH(MEMBER)
+#undef MEMBER
 };
 
 i915_param_named(modeset, int, 0400,

drivers/gpu/drm/i915/i915_params.h

@@ -28,49 +28,49 @@
 #include <linux/cache.h> /* for __read_mostly */
 
 #define I915_PARAMS_FOR_EACH(param) \
-	param(char *, vbt_firmware) \
-	param(int, modeset) \
-	param(int, panel_ignore_lid) \
-	param(int, semaphores) \
-	param(int, lvds_channel_mode) \
-	param(int, panel_use_ssc) \
-	param(int, vbt_sdvo_panel_type) \
-	param(int, enable_rc6) \
-	param(int, enable_dc) \
-	param(int, enable_fbc) \
-	param(int, enable_ppgtt) \
-	param(int, enable_execlists) \
-	param(int, enable_psr) \
-	param(int, disable_power_well) \
-	param(int, enable_ips) \
-	param(int, invert_brightness) \
-	param(int, enable_guc_loading) \
-	param(int, enable_guc_submission) \
-	param(int, guc_log_level) \
-	param(char *, guc_firmware_path) \
-	param(char *, huc_firmware_path) \
-	param(int, use_mmio_flip) \
-	param(int, mmio_debug) \
-	param(int, edp_vswing) \
-	param(int, reset) \
-	param(unsigned int, inject_load_failure) \
+	param(char *, vbt_firmware, NULL) \
+	param(int, modeset, -1) \
+	param(int, panel_ignore_lid, 1) \
+	param(int, semaphores, -1) \
+	param(int, lvds_channel_mode, 0) \
+	param(int, panel_use_ssc, -1) \
+	param(int, vbt_sdvo_panel_type, -1) \
+	param(int, enable_rc6, -1) \
+	param(int, enable_dc, -1) \
+	param(int, enable_fbc, -1) \
+	param(int, enable_ppgtt, -1) \
+	param(int, enable_execlists, -1) \
+	param(int, enable_psr, -1) \
+	param(int, disable_power_well, -1) \
+	param(int, enable_ips, 1) \
+	param(int, invert_brightness, 0) \
+	param(int, enable_guc_loading, 0) \
+	param(int, enable_guc_submission, 0) \
+	param(int, guc_log_level, -1) \
+	param(char *, guc_firmware_path, NULL) \
+	param(char *, huc_firmware_path, NULL) \
+	param(int, use_mmio_flip, 0) \
+	param(int, mmio_debug, 0) \
+	param(int, edp_vswing, 0) \
+	param(int, reset, 2) \
+	param(unsigned int, inject_load_failure, 0) \
 	/* leave bools at the end to not create holes */ \
-	param(bool, alpha_support) \
-	param(bool, enable_cmd_parser) \
-	param(bool, enable_hangcheck) \
-	param(bool, fastboot) \
-	param(bool, prefault_disable) \
-	param(bool, load_detect_test) \
-	param(bool, force_reset_modeset_test) \
-	param(bool, error_capture) \
-	param(bool, disable_display) \
-	param(bool, verbose_state_checks) \
-	param(bool, nuclear_pageflip) \
-	param(bool, enable_dp_mst) \
-	param(bool, enable_dpcd_backlight) \
-	param(bool, enable_gvt)
+	param(bool, alpha_support, IS_ENABLED(CONFIG_DRM_I915_ALPHA_SUPPORT)) \
+	param(bool, enable_cmd_parser, true) \
+	param(bool, enable_hangcheck, true) \
+	param(bool, fastboot, 0) \
+	param(bool, prefault_disable, 0) \
+	param(bool, load_detect_test, 0) \
+	param(bool, force_reset_modeset_test, 0) \
+	param(bool, error_capture, true) \
+	param(bool, disable_display, 0) \
+	param(bool, verbose_state_checks, 1) \
+	param(bool, nuclear_pageflip, 0) \
+	param(bool, enable_dp_mst, true) \
+	param(bool, enable_dpcd_backlight, false) \
+	param(bool, enable_gvt, false)
 
-#define MEMBER(T, member) T member;
+#define MEMBER(T, member, ...) T member;
 struct i915_params {
 	I915_PARAMS_FOR_EACH(MEMBER);
 };