drm/xe: Extract function to initialize xe->info

Extract the part setting up from xe->info from xe_pci_probe() into its
own function. This pairs nicely with the display counterpart, avoids
info initialization to be placed elsewhere and helps future
improvements to build fake devices for tests.

While at it, normalize the names a little bit: the _get() suffix may be
mistaken by lock-related operation, so rename the function to
"find_subplatform()". Also rename the variable to subplatform_desc to
make it easier to understand, even if longer.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20230401085151.1786204-2-lucas.demarchi@intel.com

drivers/gpu/drm/xe/xe_pci.c

@@ -349,7 +349,7 @@ static bool id_blocked(u16 device_id)
 }
 
 static const struct xe_subplatform_desc *
-subplatform_get(const struct xe_device *xe, const struct xe_device_desc *desc)
+find_subplatform(const struct xe_device *xe, const struct xe_device_desc *desc)
 {
 	const struct xe_subplatform_desc *sp;
 	const u16 *id;
@@ -362,49 +362,12 @@ subplatform_get(const struct xe_device *xe, const struct xe_device_desc *desc)
 	return NULL;
 }
 
-static void xe_pci_remove(struct pci_dev *pdev)
+static void xe_info_init(struct xe_device *xe,
+			 const struct xe_device_desc *desc,
+			 const struct xe_subplatform_desc *subplatform_desc)
 {
-	struct xe_device *xe;
-
-	xe = pci_get_drvdata(pdev);
-	if (!xe) /* driver load aborted, nothing to cleanup */
-		return;
-
-	xe_device_remove(xe);
-	xe_pm_runtime_fini(xe);
-	pci_set_drvdata(pdev, NULL);
-}
-
-static int xe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
-{
-	const struct xe_device_desc *desc = (void *)ent->driver_data;
-	const struct xe_subplatform_desc *spd;
-	struct xe_device *xe;
 	struct xe_gt *gt;
 	u8 id;
-	int err;
-
-	if (desc->require_force_probe && !id_forced(pdev->device)) {
-		dev_info(&pdev->dev,
-			 "Your graphics device %04x is not officially supported\n"
-			 "by xe driver in this kernel version. To force Xe probe,\n"
-			 "use xe.force_probe='%04x' and i915.force_probe='!%04x'\n"
-			 "module parameters or CONFIG_DRM_XE_FORCE_PROBE='%04x' and\n"
-			 "CONFIG_DRM_I915_FORCE_PROBE='!%04x' configuration options.\n",
-			 pdev->device, pdev->device, pdev->device,
-			 pdev->device, pdev->device);
-		return -ENODEV;
-	}
-
-	if (id_blocked(pdev->device)) {
-		dev_info(&pdev->dev, "Probe blocked for device [%04x:%04x].\n",
-			 pdev->vendor, pdev->device);
-		return -ENODEV;
-	}
-
-	xe = xe_device_create(pdev, ent);
-	if (IS_ERR(xe))
-		return PTR_ERR(xe);
 
 	xe->info.graphics_verx100 = desc->graphics_ver * 100 +
 				    desc->graphics_rel;
@@ -423,8 +386,8 @@ static int xe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	xe->info.has_range_tlb_invalidation = desc->has_range_tlb_invalidation;
 	xe->info.has_link_copy_engine = desc->has_link_copy_engine;
 
-	spd = subplatform_get(xe, desc);
-	xe->info.subplatform = spd ? spd->subplatform : XE_SUBPLATFORM_NONE;
+	xe->info.subplatform = subplatform_desc ?
+		subplatform_desc->subplatform : XE_SUBPLATFORM_NONE;
 	xe->info.step = xe_step_get(xe);
 
 	for (id = 0; id < xe->info.tile_count; ++id) {
@@ -449,11 +412,58 @@ static int xe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 				desc->extra_gts[id - 1].mmio_adj_offset;
 		}
 	}
+}
+
+static void xe_pci_remove(struct pci_dev *pdev)
+{
+	struct xe_device *xe;
+
+	xe = pci_get_drvdata(pdev);
+	if (!xe) /* driver load aborted, nothing to cleanup */
+		return;
+
+	xe_device_remove(xe);
+	xe_pm_runtime_fini(xe);
+	pci_set_drvdata(pdev, NULL);
+}
+
+static int xe_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	const struct xe_device_desc *desc = (void *)ent->driver_data;
+	const struct xe_subplatform_desc *subplatform_desc;
+	struct xe_device *xe;
+	int err;
+
+	if (desc->require_force_probe && !id_forced(pdev->device)) {
+		dev_info(&pdev->dev,
+			 "Your graphics device %04x is not officially supported\n"
+			 "by xe driver in this kernel version. To force Xe probe,\n"
+			 "use xe.force_probe='%04x' and i915.force_probe='!%04x'\n"
+			 "module parameters or CONFIG_DRM_XE_FORCE_PROBE='%04x' and\n"
+			 "CONFIG_DRM_I915_FORCE_PROBE='!%04x' configuration options.\n",
+			 pdev->device, pdev->device, pdev->device,
+			 pdev->device, pdev->device);
+		return -ENODEV;
+	}
+
+	if (id_blocked(pdev->device)) {
+		dev_info(&pdev->dev, "Probe blocked for device [%04x:%04x].\n",
+			 pdev->vendor, pdev->device);
+		return -ENODEV;
+	}
+
+	xe = xe_device_create(pdev, ent);
+	if (IS_ERR(xe))
+		return PTR_ERR(xe);
+
+	subplatform_desc = find_subplatform(xe, desc);
 
+	xe_info_init(xe, desc, subplatform_desc);
 	xe_display_info_init(xe);
 
 	drm_dbg(&xe->drm, "%s %s %04x:%04x dgfx:%d gfx100:%d media100:%d dma_m_s:%d tc:%d",
-		desc->platform_name, spd ? spd->name : "",
+		desc->platform_name,
+		subplatform_desc ? subplatform_desc->name : "",
 		xe->info.devid, xe->info.revid,
 		xe->info.is_dgfx, xe->info.graphics_verx100,
 		xe->info.media_verx100,