1 // SPDX-License-Identifier: GPL-2.0
23 #include <linux/pci.h>
28 #include <asm/iommu.h>
30 #include <asm/pci-direct.h>
38  * that will do the on-position decompress, and could overlap with
46  * So don't use 512M below as gart iommu, leave the space for kernel
104 /* This code runs before the PCI subsystem is initialized, so just
121 	 * make the IOMMU useless.  in allocate_aperture()
126 		pr_err("Cannot allocate aperture memory hole [mem %#010lx-%#010lx] (%uKB)\n",  in allocate_aperture()
127 		       addr, addr + aper_size - 1, aper_size >> 10);  in allocate_aperture()
130 	pr_info("Mapping aperture over RAM [mem %#010lx-%#010lx] (%uKB)\n",  in allocate_aperture()
131 		addr, addr + aper_size - 1, aper_size >> 10);  in allocate_aperture()
139 /* Find a PCI capability */
175 	pr_info("pci 0000:%02x:%02x:%02x: AGP bridge\n", bus, slot, func);  in read_agp()
178 		pr_err("pci 0000:%02x:%02x.%d: APSIZE unreadable\n",  in read_agp()
191 	*order = 7 - nbits;  in read_agp()
197 	aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32);  in read_agp()
203 	pr_info("pci 0000:%02x:%02x.%d: AGP aperture [bus addr %#010Lx-%#010Lx] (old size %uMB)\n",  in read_agp()
204 		bus, slot, func, aper, aper + (32ULL << (old_order + 20)) - 1,  in read_agp()
207 …pr_info("pci 0000:%02x:%02x.%d: AGP aperture size %uMB (APSIZE %#x) is not right, using settings f…  in read_agp()
212 	pr_info("pci 0000:%02x:%02x.%d: AGP aperture [bus addr %#010Lx-%#010Lx] (%uMB, APSIZE %#x)\n",  in read_agp()
213 		bus, slot, func, aper, aper + (32ULL << (*order + 20)) - 1,  in read_agp()
226  * Do an PCI bus scan by hand because we're running before the PCI
238 	/* Poor man's PCI discovery */  in search_agp_bridge()
287  * - the first still used by the GART initialized in the first kernel.
288  * - (sub-)set of it used as normal RAM by the second kernel.
361 			pr_info("e820: reserve [mem %#010Lx-%#010Lx] for GART\n",  in early_gart_iommu_check()
362 				aper_base, aper_base + aper_size - 1);  in early_gart_iommu_check()
431 			x86_init.iommu.iommu_init = gart_iommu_init;  in gart_iommu_hole_init()
438 			 * still be enabled if we boot into a crash-kernel here.  in gart_iommu_hole_init()
440 			 * unknown side-effects.  in gart_iommu_hole_init()
450 			pr_info("Node %d: aperture [bus addr %#010Lx-%#010Lx] (%uMB)\n",  in gart_iommu_hole_init()
451 				node, aper_base, aper_base + aper_size - 1,  in gart_iommu_hole_init()
463 						pr_err("you are using iommu with agp, but GART size is less than 64MB\n");  in gart_iommu_hole_init()
509 		pr_info("Please enable the IOMMU option in the BIOS setup\n");  in gart_iommu_hole_init()
517 			 * Could disable AGP and IOMMU here, but it's  in gart_iommu_hole_init()