drm/i915: add initial runtime info into device info

Add initial runtime info that we can copy to runtime info at i915
creation time. This lets us define the initial values for runtime info
statically while making it possible to change them runtime. This will be
the new home for the current "const" device info members that are
modified runtime anyway.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Maarten Lankhort <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/a77c6db2da20d401f47a0a5e87356b9b3f6292df.1660910433.git.jani.nikula@intel.com

drivers/gpu/drm/i915/i915_driver.c

@@ -814,6 +814,7 @@ 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;
 
 	i915 = devm_drm_dev_alloc(&pdev->dev, &i915_drm_driver,
@@ -829,7 +830,11 @@ i915_driver_create(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* Setup the write-once "constant" device info */
 	device_info = mkwrite_device_info(i915);
 	memcpy(device_info, match_info, sizeof(*device_info));
-	RUNTIME_INFO(i915)->device_id = pdev->device;
+
+	/* Initialize initial runtime info from static const data and pdev. */
+	runtime = RUNTIME_INFO(i915);
+	memcpy(runtime, &INTEL_INFO(i915)->__runtime, sizeof(*runtime));
+	runtime->device_id = pdev->device;
 
 	return i915;
 }

drivers/gpu/drm/i915/intel_device_info.h

@@ -202,6 +202,27 @@ struct ip_version {
 	u8 rel;
 };
 
+struct intel_runtime_info {
+	/*
+	 * Platform mask is used for optimizing or-ed IS_PLATFORM calls into
+	 * single runtime conditionals, and also to provide groundwork for
+	 * future per platform, or per SKU build optimizations.
+	 *
+	 * Array can be extended when necessary if the corresponding
+	 * BUILD_BUG_ON is hit.
+	 */
+	u32 platform_mask[2];
+
+	u16 device_id;
+
+	u8 num_sprites[I915_MAX_PIPES];
+	u8 num_scalers[I915_MAX_PIPES];
+
+	u32 rawclk_freq;
+
+	struct intel_step_info step;
+};
+
 struct intel_device_info {
 	struct ip_version graphics;
 	struct ip_version media;
@@ -258,27 +279,11 @@ struct intel_device_info {
 			u32 gamma_lut_tests;
 		} color;
 	} display;
-};
 
-struct intel_runtime_info {
 	/*
-	 * Platform mask is used for optimizing or-ed IS_PLATFORM calls into
-	 * into single runtime conditionals, and also to provide groundwork
-	 * for future per platform, or per SKU build optimizations.
-	 *
-	 * Array can be extended when necessary if the corresponding
-	 * BUILD_BUG_ON is hit.
+	 * Initial runtime info. Do not access outside of i915_driver_create().
 	 */
-	u32 platform_mask[2];
-
-	u16 device_id;
-
-	u8 num_sprites[I915_MAX_PIPES];
-	u8 num_scalers[I915_MAX_PIPES];
-
-	u32 rawclk_freq;
-
-	struct intel_step_info step;
+	const struct intel_runtime_info __runtime;
 };
 
 struct intel_driver_caps {