[Intel-gfx] [PATCH 16/16] drm/i915: make device info a pointer to static const data

[Jani Nikula]

Now that the device info is no longer modified runtime, we don't need to
make a copy of it, and we can convert i915->__info into a pointer to
static const data. Also remove mkwrite_device_info().

This does increase the text size slightly.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>

---

An alternative is to keep copying device info, but casting away the
const only once at the copy time, removing mkwrite_device_info().
---
 drivers/gpu/drm/i915/i915_driver.c |  8 ++------
 drivers/gpu/drm/i915/i915_drv.h    | 11 ++---------
 2 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index 5969cc7805d3..9c9c492e97a8 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -793,9 +793,6 @@ static void i915_welcome_messages(struct drm_i915_private *dev_priv)
 static struct drm_i915_private *
 i915_driver_create(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
-	const struct intel_device_info *match_info =
-		(struct intel_device_info *)ent->driver_data;
-	struct intel_device_info *device_info;
 	struct intel_runtime_info *runtime;
 	struct drm_i915_private *i915;
 
@@ -809,9 +806,8 @@ i915_driver_create(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* Device parameters start as a copy of module parameters. */
 	i915_params_copy(&i915->params, &i915_modparams);
 
-	/* Setup the write-once "constant" device info */
-	device_info = mkwrite_device_info(i915);
-	memcpy(device_info, match_info, sizeof(*device_info));
+	/* Static const device info. */
+	i915->__info = (const struct intel_device_info *)ent->driver_data;
 
 	/* Initialize initial runtime info from static const data and pdev. */
 	runtime = RUNTIME_INFO(i915);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 89472440947c..a2a57f07c5be 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -380,7 +380,7 @@ struct drm_i915_private {
 	/* i915 device parameters */
 	struct i915_params params;
 
-	const struct intel_device_info __info; /* Use INTEL_INFO() to access. */
+	const struct intel_device_info *__info; /* Use INTEL_INFO() to access. */
 	struct intel_runtime_info __runtime; /* Use RUNTIME_INFO() to access. */
 	struct intel_driver_caps caps;
 
@@ -848,7 +848,7 @@ static inline struct intel_gt *to_gt(struct drm_i915_private *i915)
 	GENMASK(INTEL_FRONTBUFFER_BITS_PER_PIPE * ((pipe) + 1) - 1, \
 		INTEL_FRONTBUFFER_BITS_PER_PIPE * (pipe))
 
-#define INTEL_INFO(dev_priv)	(&(dev_priv)->__info)
+#define INTEL_INFO(__i915)	(__i915->__info)
 #define RUNTIME_INFO(dev_priv)	(&(dev_priv)->__runtime)
 #define DRIVER_CAPS(dev_priv)	(&(dev_priv)->caps)
 
@@ -1432,13 +1432,6 @@ void i915_gem_driver_release(struct drm_i915_private *dev_priv);
 
 int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file);
 
-/* intel_device_info.c */
-static inline struct intel_device_info *
-mkwrite_device_info(struct drm_i915_private *dev_priv)
-{
-	return (struct intel_device_info *)INTEL_INFO(dev_priv);
-}
-
 static inline enum i915_map_type
 i915_coherent_map_type(struct drm_i915_private *i915,
 		       struct drm_i915_gem_object *obj, bool always_coherent)
-- 
2.30.2