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
