drm/i915/display: Dump also display parameters

GPU error dump contained all module parameters. If we are moving
display parameters to intel_display_params.[ch] they are not dumped
into GPU error dump. This patch is adding moved display parameters
back to GPU error dump. Display parameters are also included in
i915_capabilities

v2: Add parameters to i915_capabilities as well

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231024124109.384973-3-jouni.hogander@intel.com

drivers/gpu/drm/i915/display/intel_display_params.c

@@ -27,6 +27,63 @@ static struct intel_display_params intel_display_modparams __read_mostly = {
  * debugfs mode to 0.
  */
 
+__maybe_unused
+static void _param_print_bool(struct drm_printer *p, const char *driver_name,
+			      const char *name, bool val)
+{
+	drm_printf(p, "%s.%s=%s\n", driver_name, name, str_yes_no(val));
+}
+
+__maybe_unused
+static void _param_print_int(struct drm_printer *p, const char *driver_name,
+			     const char *name, int val)
+{
+	drm_printf(p, "%s.%s=%d\n", driver_name, name, val);
+}
+
+__maybe_unused
+static void _param_print_uint(struct drm_printer *p, const char *driver_name,
+			      const char *name, unsigned int val)
+{
+	drm_printf(p, "%s.%s=%u\n", driver_name, name, val);
+}
+
+__maybe_unused
+static void _param_print_ulong(struct drm_printer *p, const char *driver_name,
+			       const char *name, unsigned long val)
+{
+	drm_printf(p, "%s.%s=%lu\n", driver_name, name, val);
+}
+
+__maybe_unused
+static void _param_print_charp(struct drm_printer *p, const char *driver_name,
+			       const char *name, const char *val)
+{
+	drm_printf(p, "%s.%s=%s\n", driver_name, name, val);
+}
+
+#define _param_print(p, driver_name, name, val)			\
+	_Generic(val,						\
+		 bool : _param_print_bool,			\
+		 int : _param_print_int,			\
+		 unsigned int : _param_print_uint,		\
+		 unsigned long : _param_print_ulong,		\
+		 char * : _param_print_charp)(p, driver_name, name, val)
+
+/**
+ * intel_display_params_dump - dump intel display modparams
+ * @i915: i915 device
+ * @p: the &drm_printer
+ *
+ * Pretty printer for i915 modparams.
+ */
+void intel_display_params_dump(struct drm_i915_private *i915, struct drm_printer *p)
+{
+#define PRINT(T, x, ...) _param_print(p, i915->drm.driver->name, #x, i915->display.params.x);
+	INTEL_DISPLAY_PARAMS_FOR_EACH(PRINT);
+#undef PRINT
+}
+
 __maybe_unused static void _param_dup_charp(char **valp)
 {
 	*valp = kstrdup(*valp ? *valp : "", GFP_ATOMIC);

drivers/gpu/drm/i915/display/intel_display_params.h

@@ -7,6 +7,7 @@
 #define _INTEL_DISPLAY_PARAMS_H_
 
 struct drm_printer;
+struct drm_i915_private;
 
 /*
  * Invoke param, a function-like macro, for each intel display param, with
@@ -28,6 +29,8 @@ struct intel_display_params {
 };
 #undef MEMBER
 
+void intel_display_params_dump(struct drm_i915_private *i915,
+			       struct drm_printer *p);
 void intel_display_params_copy(struct intel_display_params *dest);
 void intel_display_params_free(struct intel_display_params *params);
 

drivers/gpu/drm/i915/i915_debugfs.c

@@ -32,6 +32,8 @@
 
 #include <drm/drm_debugfs.h>
 
+#include "display/intel_display_params.h"
+
 #include "gem/i915_gem_context.h"
 #include "gt/intel_gt.h"
 #include "gt/intel_gt_buffer_pool.h"
@@ -74,6 +76,7 @@ static int i915_capabilities(struct seq_file *m, void *data)
 
 	kernel_param_lock(THIS_MODULE);
 	i915_params_dump(&i915->params, &p);
+	intel_display_params_dump(i915, &p);
 	kernel_param_unlock(THIS_MODULE);
 
 	return 0;

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -660,6 +660,7 @@ static void err_print_params(struct drm_i915_error_state_buf *m,
 	struct drm_printer p = i915_error_printer(m);
 
 	i915_params_dump(params, &p);
+	intel_display_params_dump(m->i915, &p);
 }
 
 static void err_print_pciid(struct drm_i915_error_state_buf *m,
@@ -1027,6 +1028,7 @@ static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
 static void cleanup_params(struct i915_gpu_coredump *error)
 {
 	i915_params_free(&error->params);
+	intel_display_params_free(&error->display_params);
 }
 
 static void cleanup_uc(struct intel_uc_coredump *uc)
@@ -1979,6 +1981,7 @@ static void capture_gen(struct i915_gpu_coredump *error)
 	error->suspend_count = i915->suspend_count;
 
 	i915_params_copy(&error->params, &i915->params);
+	intel_display_params_copy(&error->display_params);
 	memcpy(&error->device_info,
 	       INTEL_INFO(i915),
 	       sizeof(error->device_info));

drivers/gpu/drm/i915/i915_gpu_error.h

@@ -15,6 +15,7 @@
 #include <drm/drm_mm.h>
 
 #include "display/intel_display_device.h"
+#include "display/intel_display_params.h"
 #include "gt/intel_engine.h"
 #include "gt/intel_gt_types.h"
 #include "gt/uc/intel_uc_fw.h"
@@ -214,6 +215,7 @@ struct i915_gpu_coredump {
 	struct intel_display_runtime_info display_runtime_info;
 	struct intel_driver_caps driver_caps;
 	struct i915_params params;
+	struct intel_display_params display_params;
 
 	struct intel_overlay_error_state *overlay;