write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/drivers/gpu/vga/vgaarb.c
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@@ -48,6 +48,8 @@
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 #include <linux/miscdevice.h>
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 #include <linux/slab.h>
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 #include <linux/screen_info.h>
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+#include <linux/vt.h>
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+#include <linux/console.h>
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 #include <linux/uaccess.h>
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@@ -167,6 +169,53 @@
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 	pci_dev_put(vga_default);
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 	vga_default = pci_dev_get(pdev);
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 }
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+
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+/**
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+ * vga_remove_vgacon - deactivete vga console
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+ *
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+ * Unbind and unregister vgacon in case pdev is the default vga
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+ * device.  Can be called by gpu drivers on initialization to make
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+ * sure vga register access done by vgacon will not disturb the
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+ * device.
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+ *
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+ * @pdev: pci device.
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+ */
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+#if !defined(CONFIG_VGA_CONSOLE)
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+int vga_remove_vgacon(struct pci_dev *pdev)
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+{
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+	return 0;
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+}
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+#elif !defined(CONFIG_DUMMY_CONSOLE)
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+int vga_remove_vgacon(struct pci_dev *pdev)
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+{
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+	return -ENODEV;
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+}
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+#else
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+int vga_remove_vgacon(struct pci_dev *pdev)
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+{
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+	int ret = 0;
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+
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+	if (pdev != vga_default)
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+		return 0;
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+	vgaarb_info(&pdev->dev, "deactivate vga console\n");
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+
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+	console_lock();
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+	if (con_is_bound(&vga_con))
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+		ret = do_take_over_console(&dummy_con, 0,
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+					   MAX_NR_CONSOLES - 1, 1);
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+	if (ret == 0) {
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+		ret = do_unregister_con_driver(&vga_con);
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+
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+		/* Ignore "already unregistered". */
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+		if (ret == -ENODEV)
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+			ret = 0;
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+	}
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+	console_unlock();
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+
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+	return ret;
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+}
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+#endif
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+EXPORT_SYMBOL(vga_remove_vgacon);
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 static inline void vga_irq_set_state(struct vga_device *vgadev, bool state)
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 {
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@@ -480,7 +529,7 @@
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  *
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  * 0 on success, negative error code on failure.
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  */
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-int vga_tryget(struct pci_dev *pdev, unsigned int rsrc)
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+static int vga_tryget(struct pci_dev *pdev, unsigned int rsrc)
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 {
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 	struct vga_device *vgadev;
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 	unsigned long flags;
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@@ -505,7 +554,6 @@
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 	spin_unlock_irqrestore(&vga_lock, flags);
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 	return rc;
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 }
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-EXPORT_SYMBOL(vga_tryget);
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 /**
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  * vga_put - release lock on legacy VGA resources
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@@ -676,7 +724,7 @@
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 	vga_arbiter_check_bridge_sharing(vgadev);
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 	/* Add to the list */
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-	list_add(&vgadev->list, &vga_list);
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+	list_add_tail(&vgadev->list, &vga_list);
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 	vga_count++;
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 	vgaarb_info(&pdev->dev, "VGA device added: decodes=%s,owns=%s,locks=%s\n",
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 		vga_iostate_to_str(vgadev->decodes),
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@@ -1408,6 +1456,18 @@
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 	struct vga_device *vgadev;
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 #if defined(CONFIG_X86) || defined(CONFIG_IA64)
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+	u64 base = screen_info.lfb_base;
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+	u64 size = screen_info.lfb_size;
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+	u64 limit;
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+	resource_size_t start, end;
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+	unsigned long flags;
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+	int i;
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+
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+	if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
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+		base |= (u64)screen_info.ext_lfb_base << 32;
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+
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+	limit = base + size;
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+
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 	list_for_each_entry(vgadev, &vga_list, list) {
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 		struct device *dev = &vgadev->pdev->dev;
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 		/*
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@@ -1418,11 +1478,6 @@
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 		 * Select the device owning the boot framebuffer if there is
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 		 * one.
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 		 */
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-		resource_size_t start, end, limit;
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-		unsigned long flags;
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-		int i;
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-
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-		limit = screen_info.lfb_base + screen_info.lfb_size;
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 		/* Does firmware framebuffer belong to us? */
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 		for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
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@@ -1437,7 +1492,7 @@
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 			if (!start || !end)
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 				continue;
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-			if (screen_info.lfb_base < start || limit >= end)
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+			if (base < start || limit >= end)
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 				continue;
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 			if (!vga_default_device())