drm/i915: add a helper to make a copy of i915_params

Abstract the one user in anticipation of more.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/c6a94b4da8dc723df025b1f602fe46d76d00d53f.1545920737.git.jani.nikula@intel.com

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 63df41d..8c04479 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1834,18 +1834,9 @@ static void capture_gen_state(struct i915_gpu_state *error)
        error->driver_caps = i915->caps;
 }
 
-static __always_inline void dup_param(const char *type, void *x)
-{
-       if (!__builtin_strcmp(type, "char *"))
-               *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
-}
-
 static void capture_params(struct i915_gpu_state *error)
 {
-       error->params = i915_modparams;
-#define DUP(T, x, ...) dup_param(#T, &error->params.x);
-       I915_PARAMS_FOR_EACH(DUP);
-#undef DUP
+       i915_params_copy(&error->params, &i915_modparams);
 }
 
 static unsigned long capture_find_epoch(const struct i915_gpu_state *error)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 2e03565..ae3ece4 100644 (file)
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -203,3 +203,17 @@ void i915_params_dump(const struct i915_params *params, struct drm_printer *p)
        I915_PARAMS_FOR_EACH(PRINT);
 #undef PRINT
 }
+
+static __always_inline void dup_param(const char *type, void *x)
+{
+       if (!__builtin_strcmp(type, "char *"))
+               *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
+}
+
+void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
+{
+       *dest = *src;
+#define DUP(T, x, ...) dup_param(#T, &dest->x);
+       I915_PARAMS_FOR_EACH(DUP);
+#undef DUP
+}

diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 7e56c51..fd1cf94 100644 (file)
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -78,6 +78,7 @@ struct i915_params {
 extern struct i915_params i915_modparams __read_mostly;
 
 void i915_params_dump(const struct i915_params *params, struct drm_printer *p);
+void i915_params_copy(struct i915_params *dest, const struct i915_params *src);
 
 #endif