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Linux/arch/x86/pci/legacy.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * legacy.c - traditional, old school PCI bus probing
  4  */
  5 #include <linux/init.h>
  6 #include <linux/export.h>
  7 #include <linux/pci.h>
  8 #include <asm/jailhouse_para.h>
  9 #include <asm/pci_x86.h>
 10 
 11 /*
 12  * Discover remaining PCI buses in case there are peer host bridges.
 13  * We use the number of last PCI bus provided by the PCI BIOS.
 14  */
 15 static void pcibios_fixup_peer_bridges(void)
 16 {
 17         int n;
 18 
 19         if (pcibios_last_bus <= 0 || pcibios_last_bus > 0xff)
 20                 return;
 21         DBG("PCI: Peer bridge fixup\n");
 22 
 23         for (n=0; n <= pcibios_last_bus; n++)
 24                 pcibios_scan_specific_bus(n);
 25 }
 26 
 27 int __init pci_legacy_init(void)
 28 {
 29         if (!raw_pci_ops)
 30                 return 1;
 31 
 32         pr_info("PCI: Probing PCI hardware\n");
 33         pcibios_scan_root(0);
 34         return 0;
 35 }
 36 
 37 void pcibios_scan_specific_bus(int busn)
 38 {
 39         int stride = jailhouse_paravirt() ? 1 : 8;
 40         int devfn;
 41         u32 l;
 42 
 43         if (pci_find_bus(0, busn))
 44                 return;
 45 
 46         for (devfn = 0; devfn < 256; devfn += stride) {
 47                 if (!raw_pci_read(0, busn, devfn, PCI_VENDOR_ID, 2, &l) &&
 48                     l != 0x0000 && l != 0xffff) {
 49                         DBG("Found device at %02x:%02x [%04x]\n", busn, devfn, l);
 50                         pr_info("PCI: Discovered peer bus %02x\n", busn);
 51                         pcibios_scan_root(busn);
 52                         return;
 53                 }
 54         }
 55 }
 56 EXPORT_SYMBOL_GPL(pcibios_scan_specific_bus);
 57 
 58 static int __init pci_subsys_init(void)
 59 {
 60         /*
 61          * The init function returns an non zero value when
 62          * pci_legacy_init should be invoked.
 63          */
 64         if (x86_init.pci.init()) {
 65                 if (pci_legacy_init()) {
 66                         pr_info("PCI: System does not support PCI\n");
 67                         return -ENODEV;
 68                 }
 69         }
 70 
 71         pcibios_fixup_peer_bridges();
 72         x86_init.pci.init_irq();
 73         pcibios_init();
 74 
 75         return 0;
 76 }
 77 subsys_initcall(pci_subsys_init);
 78 

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