File 0003-fix-5.7-rc1-reinstate-legacy-support.patch of Package x11-video-nvidiaG03

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File 0003-fix-5.7-rc1-reinstate-legacy-support.patch of Package x11-video-nvidiaG03

From a955b00bb4fc5f60f2b17f33e96d110bf0a605e1 Mon Sep 17 00:00:00 2001
From: MilhouseVH <milhouseVH.github@nmacleod.com>
Date: Mon, 13 Apr 2020 01:47:06 +0100
Subject: [PATCH] HACK: implement the pci/agp support marked legacy in 5.7-rc1

drm_get_pci_dev: https://github.com/torvalds/linux/commit/c393fbae0226e9ad8719a516bec66bb2b8bbfcb6
drm_pci_agp_init: https://github.com/torvalds/linux/commit/ee21ec7767621c1adb0a388e0e7d841674cdc43f
---
 kernel/nv-drm.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)

diff --git a/kernel/nv-drm.c b/kernel/nv-drm.c
index 2e4b867..059f258 100644
--- a/kernel/nv-drm.c
+++ b/kernel/nv-drm.c
@@ -51,6 +51,137 @@
 #define nv_drm_pci_init drm_legacy_pci_init
 #define nv_drm_pci_exit drm_legacy_pci_exit
 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(5, 6, 0)
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 7, 0)
+#include <drm/drm_agpsupport.h>
+
+struct drm_agp_mem {
+	unsigned long handle;
+	struct agp_memory *memory;
+	unsigned long bound;
+	int pages;
+	struct list_head head;
+};
+
+/**
+ * drm_legacy_agp_clear - Clear AGP resource list
+ * @dev: DRM device
+ *
+ * Iterate over all AGP resources and remove them. But keep the AGP head
+ * intact so it can still be used. It is safe to call this if AGP is disabled or
+ * was already removed.
+ *
+ * Cleanup is only done for drivers who have DRIVER_LEGACY set.
+ */
+void drm_legacy_agp_clear(struct drm_device *dev)
+{
+	struct drm_agp_mem *entry, *tempe;
+
+	if (!dev->agp)
+		return;
+	if (!drm_core_check_feature(dev, DRIVER_LEGACY))
+		return;
+
+	list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
+		if (entry->bound)
+			agp_unbind_memory(entry->memory);
+		agp_free_memory(entry->memory);
+		kfree(entry);
+	}
+	INIT_LIST_HEAD(&dev->agp->memory);
+
+	if (dev->agp->acquired)
+		drm_agp_release(dev);
+
+	dev->agp->acquired = 0;
+	dev->agp->enabled = 0;
+}
+
+static void drm_pci_agp_init(struct drm_device *dev)
+{
+	if (drm_core_check_feature(dev, DRIVER_USE_AGP)) {
+		if (pci_find_capability(dev->pdev, PCI_CAP_ID_AGP))
+			dev->agp = drm_agp_init(dev);
+		if (dev->agp) {
+			dev->agp->agp_mtrr = arch_phys_wc_add(
+				dev->agp->agp_info.aper_base,
+				dev->agp->agp_info.aper_size *
+				1024 * 1024);
+		}
+	}
+}
+
+void drm_pci_agp_destroy(struct drm_device *dev)
+{
+	if (dev->agp) {
+		arch_phys_wc_del(dev->agp->agp_mtrr);
+		drm_legacy_agp_clear(dev);
+		kfree(dev->agp);
+		dev->agp = NULL;
+	}
+}
+
+/**
+ * drm_get_pci_dev - Register a PCI device with the DRM subsystem
+ * @pdev: PCI device
+ * @ent: entry from the PCI ID table that matches @pdev
+ * @driver: DRM device driver
+ *
+ * Attempt to gets inter module "drm" information. If we are first
+ * then register the character device and inter module information.
+ * Try and register, if we fail to register, backout previous work.
+ *
+ * NOTE: This function is deprecated, please use drm_dev_alloc() and
+ * drm_dev_register() instead and remove your &drm_driver.load callback.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
+		    struct drm_driver *driver)
+{
+	struct drm_device *dev;
+	int ret;
+
+	DRM_DEBUG("\n");
+
+	dev = drm_dev_alloc(driver, &pdev->dev);
+	if (IS_ERR(dev))
+		return PTR_ERR(dev);
+
+	ret = pci_enable_device(pdev);
+	if (ret)
+		goto err_free;
+
+	dev->pdev = pdev;
+#ifdef __alpha__
+	dev->hose = pdev->sysdata;
+#endif
+
+	if (drm_core_check_feature(dev, DRIVER_MODESET))
+		pci_set_drvdata(pdev, dev);
+
+	drm_pci_agp_init(dev);
+
+	ret = drm_dev_register(dev, ent->driver_data);
+	if (ret)
+		goto err_agp;
+
+	/* No locking needed since shadow-attach is single-threaded since it may
+	 * only be called from the per-driver module init hook. */
+	if (drm_core_check_feature(dev, DRIVER_LEGACY))
+		list_add_tail(&dev->legacy_dev_list, &driver->legacy_dev_list);
+
+	return 0;
+
+err_agp:
+	drm_pci_agp_destroy(dev);
+	pci_disable_device(pdev);
+err_free:
+	drm_dev_put(dev);
+	return ret;
+}
+#endif
+
 int nv_drm_pci_init(struct drm_driver *driver, struct pci_driver *pdriver)
 {
 	struct pci_dev *pdev = NULL;
-- 
2.20.1

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File 0003-fix-5.7-rc1-reinstate-legacy-support.patch of Package x11-video-nvidiaG03

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