drm/i915: Show the current i915_params in debugfs/i915_capabilites

Alongside the hw capabilities, it is useful to know which of those have
been overridden by the user setting module parameters.

v2: Use __always_inline and BUILD_BUG magic

Signed-off-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>
Link: http://patchwork.freedesktop.org/patch/msgid/20170206213608.31328-4-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 3ae06568df7bcc5bc29b62cb30e5acfc62be8c4f..152f23db4ec2e7659353799a0471d637ffc45b11 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -61,6 +61,21 @@ drm_add_fake_info_node(struct drm_minor *minor,
        return 0;
 }
 
+static __always_inline void seq_print_param(struct seq_file *m,
+                                           const char *name,
+                                           const char *type,
+                                           const void *x)
+{
+       if (!__builtin_strcmp(type, "bool"))
+               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"))
+               seq_printf(m, "i915.%s=%u\n", name, *(const unsigned int *)x);
+       else
+               BUILD_BUG();
+}
+
 static int i915_capabilities(struct seq_file *m, void *data)
 {
        struct drm_i915_private *dev_priv = node_to_i915(m->private);
@@ -69,10 +84,17 @@ static int i915_capabilities(struct seq_file *m, void *data)
        seq_printf(m, "gen: %d\n", INTEL_GEN(dev_priv));
        seq_printf(m, "platform: %s\n", intel_platform_name(info->platform));
        seq_printf(m, "pch: %d\n", INTEL_PCH_TYPE(dev_priv));
+
 #define PRINT_FLAG(x)  seq_printf(m, #x ": %s\n", yesno(info->x))
        DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG);
 #undef PRINT_FLAG
 
+       kernel_param_lock(THIS_MODULE);
+#define PRINT_PARAM(T, x) seq_print_param(m, #x, #T, &i915.x);
+       I915_PARAMS_FOR_EACH(PRINT_PARAM);
+#undef PRINT_PARAM
+       kernel_param_unlock(THIS_MODULE);
+
        return 0;
 }