1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
30  * Simple driver for PCI VGA display devices.  Drivers such as agp(4) and
53 #include <compat/x86bios/x86bios.h> /* To re-POST the card. */
75 int vga_pci_default_unit = -1;
77     &vga_pci_default_unit, -1, "Default VGA-compatible display");
96 		 * The boot display device was determined by a previous  in vga_pci_is_boot_display()
104 	 * The primary video card used as a boot display must have the  in vga_pci_is_boot_display()
108 	 * Furthermore, if the card is attached to a bridge, instead of  in vga_pci_is_boot_display()
109 	 * the root PCI bus, the bridge must have the "VGA Enable" bit  in vga_pci_is_boot_display()
117 		 * The parent bridge is a PCI-to-PCI bridge: check the  in vga_pci_is_boot_display()
131 	 * this PCI device. Else unhandled display adapter interrupts  in vga_pci_is_boot_display()
136 	/* This video card is the boot display: record its unit number. */  in vga_pci_is_boot_display()
148 	 * FLR is unsupported on GPUs so attempt a power-management reset by cycling  in vga_pci_reset()
175 		 * On x86, the System BIOS copy the default display  in vga_pci_map_bios()
192 		 * The parent bridge is a PCI-to-PCI bridge: check the  in vga_pci_map_bios()
233 		device_printf(dev, "initial ROM mapping failed -- resetting\n");  in vga_pci_map_bios()
244 	vga_pci_release_resource(dev, NULL, vr->vr_res);  in vga_pci_map_bios()
247 	 * re-allocate  in vga_pci_map_bios()
267 	vga_pci_release_resource(dev, NULL, vr->vr_res);  in vga_pci_map_bios()
307 	KASSERT(vr->vr_res != NULL, ("vga_pci_unmap_bios: bios not mapped"));  in vga_pci_unmap_bios()
308 	KASSERT(rman_get_virtual(vr->vr_res) == bios,  in vga_pci_unmap_bios()
310 	vga_pci_release_resource(dev, NULL, vr->vr_res);  in vga_pci_unmap_bios()
358 	/* Probe default display. */  in vga_pci_probe()
361 	device_set_desc(dev, "VGA-compatible display");  in vga_pci_probe()
419 		return (&sc->vga_bios);  in lookup_res()
422 		return (&sc->vga_bars[bar]);  in lookup_res()
442 		if (vr->vr_res == NULL)  in vga_pci_alloc_resource()
443 			vr->vr_res = bus_alloc_resource(dev, type, rid, start,  in vga_pci_alloc_resource()
445 		if (vr->vr_res != NULL)  in vga_pci_alloc_resource()
446 			vr->vr_refs++;  in vga_pci_alloc_resource()
447 		return (vr->vr_res);  in vga_pci_alloc_resource()
468 		if (vr->vr_res == NULL)  in vga_pci_release_resource()
470 		KASSERT(vr->vr_res == r, ("vga_pci resource mismatch"));  in vga_pci_release_resource()
471 		if (vr->vr_refs > 1) {  in vga_pci_release_resource()
472 			vr->vr_refs--;  in vga_pci_release_resource()
475 		KASSERT(vr->vr_refs > 0,  in vga_pci_release_resource()
479 			vr->vr_res = NULL;  in vga_pci_release_resource()
480 			vr->vr_refs = 0;  in vga_pci_release_resource()
634 	if (sc->vga_msi_child != NULL)  in vga_pci_alloc_msi()
638 		sc->vga_msi_child = child;  in vga_pci_alloc_msi()
649 	if (sc->vga_msi_child != NULL)  in vga_pci_alloc_msix()
653 		sc->vga_msi_child = child;  in vga_pci_alloc_msix()
664 	if (sc->vga_msi_child != child)  in vga_pci_remap_msix()
676 	if (sc->vga_msi_child != child)  in vga_pci_release_msi()
680 		sc->vga_msi_child = NULL;  in vga_pci_release_msi()