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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 | /* * mmconfig.c - Low-level direct PCI config space access via MMCONFIG * * This is an 64bit optimized version that always keeps the full mmconfig * space mapped. This allows lockless config space operation. */ #include <linux/pci.h> #include <linux/init.h> #include <linux/acpi.h> #include <linux/bitmap.h> #include <asm/e820.h> #include "pci.h" /* Static virtual mapping of the MMCONFIG aperture */ struct mmcfg_virt { struct acpi_mcfg_allocation *cfg; char __iomem *virt; }; static struct mmcfg_virt *pci_mmcfg_virt; static char __iomem *get_virt(unsigned int seg, unsigned bus) { struct acpi_mcfg_allocation *cfg; int cfg_num; for (cfg_num = 0; cfg_num < pci_mmcfg_config_num; cfg_num++) { cfg = pci_mmcfg_virt[cfg_num].cfg; if (cfg->pci_segment == seg && (cfg->start_bus_number <= bus) && (cfg->end_bus_number >= bus)) return pci_mmcfg_virt[cfg_num].virt; } /* Fall back to type 0 */ return NULL; } static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned int devfn) { char __iomem *addr; if (seg == 0 && bus < PCI_MMCFG_MAX_CHECK_BUS && test_bit(32*bus + PCI_SLOT(devfn), pci_mmcfg_fallback_slots)) return NULL; addr = get_virt(seg, bus); if (!addr) return NULL; return addr + ((bus << 20) | (devfn << 12)); } static int pci_mmcfg_read(unsigned int seg, unsigned int bus, unsigned int devfn, int reg, int len, u32 *value) { char __iomem *addr; /* Why do we have this when nobody checks it. How about a BUG()!? -AK */ if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) { *value = -1; return -EINVAL; } addr = pci_dev_base(seg, bus, devfn); if (!addr) return pci_conf1_read(seg,bus,devfn,reg,len,value); switch (len) { case 1: *value = readb(addr + reg); break; case 2: *value = readw(addr + reg); break; case 4: *value = readl(addr + reg); break; } return 0; } static int pci_mmcfg_write(unsigned int seg, unsigned int bus, unsigned int devfn, int reg, int len, u32 value) { char __iomem *addr; /* Why do we have this when nobody checks it. How about a BUG()!? -AK */ if (unlikely((bus > 255) || (devfn > 255) || (reg > 4095))) return -EINVAL; addr = pci_dev_base(seg, bus, devfn); if (!addr) return pci_conf1_write(seg,bus,devfn,reg,len,value); switch (len) { case 1: writeb(value, addr + reg); break; case 2: writew(value, addr + reg); break; case 4: writel(value, addr + reg); break; } return 0; } static struct pci_raw_ops pci_mmcfg = { .read = pci_mmcfg_read, .write = pci_mmcfg_write, }; static void __iomem * __init mcfg_ioremap(struct acpi_mcfg_allocation *cfg) { void __iomem *addr; u32 size; size = (cfg->end_bus_number + 1) << 20; addr = ioremap_nocache(cfg->address, size); if (addr) { printk(KERN_INFO "PCI: Using MMCONFIG at %Lx - %Lx\n", cfg->address, cfg->address + size - 1); } return addr; } int __init pci_mmcfg_arch_reachable(unsigned int seg, unsigned int bus, unsigned int devfn) { return pci_dev_base(seg, bus, devfn) != NULL; } int __init pci_mmcfg_arch_init(void) { int i; pci_mmcfg_virt = kmalloc(sizeof(*pci_mmcfg_virt) * pci_mmcfg_config_num, GFP_KERNEL); if (pci_mmcfg_virt == NULL) { printk(KERN_ERR "PCI: Can not allocate memory for mmconfig structures\n"); return 0; } for (i = 0; i < pci_mmcfg_config_num; ++i) { pci_mmcfg_virt[i].cfg = &pci_mmcfg_config[i]; pci_mmcfg_virt[i].virt = mcfg_ioremap(&pci_mmcfg_config[i]); if (!pci_mmcfg_virt[i].virt) { printk(KERN_ERR "PCI: Cannot map mmconfig aperture for " "segment %d\n", pci_mmcfg_config[i].pci_segment); return 0; } } raw_pci_ops = &pci_mmcfg; return 1; } |