[Intel-gfx] [PATCH v2 1/6] drm/i915: use mock device info for creating mock device

[Jani Nikula]

Instead of modifying the device info on the fly, use static const mock
device info.

It's not okay to modify device info at runtime; we've added separate
runtime info for info that needs to be modified at runtime. We've added
safeguards to device info to prevent it from being modified, but commit
5e352e32aec2 ("drm/i915: preparation for using PAT index") just cast the
const away and modified it anyway. This prevents device info from being
moved to rodata.

Fixes: 5e352e32aec2 ("drm/i915: preparation for using PAT index")
Suggested-by: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Fei Yang <fei.yang at intel.com>
Cc: Andi Shyti <andi.shyti at linux.intel.com>
Cc: Andrzej Hajda <andrzej.hajda at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 .../gpu/drm/i915/selftests/mock_gem_device.c  | 45 ++++++++++---------
 1 file changed, 24 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index 09d4bbcdcdbf..4de6a4e8280d 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -118,15 +118,31 @@ static void mock_gt_probe(struct drm_i915_private *i915)
 	i915->gt[0]->name = "Mock GT";
 }
 
+static const struct intel_device_info mock_info = {
+	.__runtime.graphics.ip.ver = -1,
+	.__runtime.page_sizes = (I915_GTT_PAGE_SIZE_4K |
+				 I915_GTT_PAGE_SIZE_64K |
+				 I915_GTT_PAGE_SIZE_2M),
+	.__runtime.memory_regions = REGION_SMEM,
+	.__runtime.platform_engine_mask = BIT(0),
+
+	/* simply use legacy cache level for mock device */
+	.max_pat_index = 3,
+	.cachelevel_to_pat = {
+		[I915_CACHE_NONE]   = 0,
+		[I915_CACHE_LLC]    = 1,
+		[I915_CACHE_L3_LLC] = 2,
+		[I915_CACHE_WT]     = 3,
+	},
+};
+
 struct drm_i915_private *mock_gem_device(void)
 {
 #if IS_ENABLED(CONFIG_IOMMU_API) && defined(CONFIG_INTEL_IOMMU)
 	static struct dev_iommu fake_iommu = { .priv = (void *)-1 };
 #endif
 	struct drm_i915_private *i915;
-	struct intel_device_info *i915_info;
 	struct pci_dev *pdev;
-	unsigned int i;
 	int ret;
 
 	pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
@@ -159,15 +175,18 @@ struct drm_i915_private *mock_gem_device(void)
 
 	pci_set_drvdata(pdev, i915);
 
+	/* Device parameters start as a copy of module parameters. */
+	i915_params_copy(&i915->params, &i915_modparams);
+
+	/* Set up device info and initial runtime info. */
+	intel_device_info_driver_create(i915, pdev->device, &mock_info);
+
 	dev_pm_domain_set(&pdev->dev, &pm_domain);
 	pm_runtime_enable(&pdev->dev);
 	pm_runtime_dont_use_autosuspend(&pdev->dev);
 	if (pm_runtime_enabled(&pdev->dev))
 		WARN_ON(pm_runtime_get_sync(&pdev->dev));
 
-
-	i915_params_copy(&i915->params, &i915_modparams);
-
 	intel_runtime_pm_init_early(&i915->runtime_pm);
 	/* wakeref tracking has significant overhead */
 	i915->runtime_pm.no_wakeref_tracking = true;
@@ -175,21 +194,6 @@ struct drm_i915_private *mock_gem_device(void)
 	/* Using the global GTT may ask questions about KMS users, so prepare */
 	drm_mode_config_init(&i915->drm);
 
-	RUNTIME_INFO(i915)->graphics.ip.ver = -1;
-
-	RUNTIME_INFO(i915)->page_sizes =
-		I915_GTT_PAGE_SIZE_4K |
-		I915_GTT_PAGE_SIZE_64K |
-		I915_GTT_PAGE_SIZE_2M;
-
-	RUNTIME_INFO(i915)->memory_regions = REGION_SMEM;
-
-	/* simply use legacy cache level for mock device */
-	i915_info = (struct intel_device_info *)INTEL_INFO(i915);
-	i915_info->max_pat_index = 3;
-	for (i = 0; i < I915_MAX_CACHE_LEVEL; i++)
-		i915_info->cachelevel_to_pat[i] = i;
-
 	intel_memory_regions_hw_probe(i915);
 
 	spin_lock_init(&i915->gpu_error.lock);
@@ -223,7 +227,6 @@ struct drm_i915_private *mock_gem_device(void)
 	mock_init_ggtt(to_gt(i915));
 	to_gt(i915)->vm = i915_vm_get(&to_gt(i915)->ggtt->vm);
 
-	RUNTIME_INFO(i915)->platform_engine_mask = BIT(0);
 	to_gt(i915)->info.engine_mask = BIT(0);
 
 	to_gt(i915)->engine[RCS0] = mock_engine(i915, "mock", RCS0);
-- 
2.39.2