1 /* 2 * This is splited from hw/i386/kvm/pci-assign.c 3 */ 4 #include "qemu/osdep.h" 5 #include "qapi/error.h" 6 #include "hw/i386/pc.h" 7 #include "qemu/error-report.h" 8 #include "ui/console.h" 9 #include "hw/loader.h" 10 #include "monitor/monitor.h" 11 #include "qemu/range.h" 12 #include "sysemu/sysemu.h" 13 #include "hw/pci/pci.h" 14 #include "xen_pt.h" 15 16 /* 17 * Scan the assigned devices for the devices that have an option ROM, and then 18 * load the corresponding ROM data to RAM. If an error occurs while loading an 19 * option ROM, we just ignore that option ROM and continue with the next one. 20 */ 21 void *pci_assign_dev_load_option_rom(PCIDevice *dev, 22 int *size, unsigned int domain, 23 unsigned int bus, unsigned int slot, 24 unsigned int function) 25 { 26 char name[32], rom_file[64]; 27 FILE *fp; 28 uint8_t val; 29 struct stat st; 30 void *ptr = NULL; 31 Object *owner = OBJECT(dev); 32 33 /* If loading ROM from file, pci handles it */ 34 if (dev->romfile || !dev->rom_bar) { 35 return NULL; 36 } 37 38 snprintf(rom_file, sizeof(rom_file), 39 "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom", 40 domain, bus, slot, function); 41 42 /* Write "1" to the ROM file to enable it */ 43 fp = fopen(rom_file, "r+"); 44 if (fp == NULL) { 45 if (errno != ENOENT) { 46 error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno)); 47 } 48 return NULL; 49 } 50 if (fstat(fileno(fp), &st) == -1) { 51 error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno)); 52 goto close_rom; 53 } 54 55 val = 1; 56 if (fwrite(&val, 1, 1, fp) != 1) { 57 goto close_rom; 58 } 59 fseek(fp, 0, SEEK_SET); 60 61 snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner)); 62 memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort); 63 ptr = memory_region_get_ram_ptr(&dev->rom); 64 memset(ptr, 0xff, st.st_size); 65 66 if (!fread(ptr, 1, st.st_size, fp)) { 67 error_report("pci-assign: Cannot read from host %s", rom_file); 68 error_printf("Device option ROM contents are probably invalid " 69 "(check dmesg).\nSkip option ROM probe with rombar=0, " 70 "or load from file with romfile=\n"); 71 goto close_rom; 72 } 73 74 pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom); 75 dev->has_rom = true; 76 *size = st.st_size; 77 close_rom: 78 /* Write "0" to disable ROM */ 79 fseek(fp, 0, SEEK_SET); 80 val = 0; 81 if (!fwrite(&val, 1, 1, fp)) { 82 XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file"); 83 } 84 fclose(fp); 85 86 return ptr; 87 } 88