1 // SPDX-License-Identifier: GPL-2.0
3  * mmconfig.c - Low-level direct PCI config space access via MMCONFIG
6  * space mapped. This allows lockless config space operation.
21 	struct pci_mmcfg_region *cfg = pci_mmconfig_lookup(seg, bus);  in pci_dev_base()  local
23 	if (cfg && cfg->virt)  in pci_dev_base()
24 		return cfg->virt + (PCI_MMCFG_BUS_OFFSET(bus) | (devfn << 12));  in pci_dev_base()
33 	/* Why do we have this when nobody checks it. How about a BUG()!? -AK */  in pci_mmcfg_read()
35 err:		*value = -1;  in pci_mmcfg_read()
36 		return -EINVAL;  in pci_mmcfg_read()
67 	/* Why do we have this when nobody checks it. How about a BUG()!? -AK */  in pci_mmcfg_write()
69 		return -EINVAL;  in pci_mmcfg_write()
75 		return -EINVAL;  in pci_mmcfg_write()
99 static void __iomem *mcfg_ioremap(struct pci_mmcfg_region *cfg)  in mcfg_ioremap()  argument
105 	start = cfg->address + PCI_MMCFG_BUS_OFFSET(cfg->start_bus);  in mcfg_ioremap()
106 	num_buses = cfg->end_bus - cfg->start_bus + 1;  in mcfg_ioremap()
110 		addr -= PCI_MMCFG_BUS_OFFSET(cfg->start_bus);  in mcfg_ioremap()
116 	struct pci_mmcfg_region *cfg;  in pci_mmcfg_arch_init()  local
118 	list_for_each_entry(cfg, &pci_mmcfg_list, list)  in pci_mmcfg_arch_init()
119 		if (pci_mmcfg_arch_map(cfg)) {  in pci_mmcfg_arch_init()
131 	struct pci_mmcfg_region *cfg;  in pci_mmcfg_arch_free()  local
133 	list_for_each_entry(cfg, &pci_mmcfg_list, list)  in pci_mmcfg_arch_free()
134 		pci_mmcfg_arch_unmap(cfg);  in pci_mmcfg_arch_free()
137 int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg)  in pci_mmcfg_arch_map()  argument
139 	cfg->virt = mcfg_ioremap(cfg);  in pci_mmcfg_arch_map()
140 	if (!cfg->virt) {  in pci_mmcfg_arch_map()
141 		pr_err(PREFIX "can't map MMCONFIG at %pR\n", &cfg->res);  in pci_mmcfg_arch_map()
142 		return -ENOMEM;  in pci_mmcfg_arch_map()
148 void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg)  in pci_mmcfg_arch_unmap()  argument
150 	if (cfg && cfg->virt) {  in pci_mmcfg_arch_unmap()
151 		iounmap(cfg->virt + PCI_MMCFG_BUS_OFFSET(cfg->start_bus));  in pci_mmcfg_arch_unmap()
152 		cfg->virt = NULL;  in pci_mmcfg_arch_unmap()