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 "qemu/error-report.h" 7 #include "hw/loader.h" 8 #include "hw/pci/pci.h" 9 #include "xen_pt.h" 10 11 /* 12 * Scan the assigned devices for the devices that have an option ROM, and then 13 * load the corresponding ROM data to RAM. If an error occurs while loading an 14 * option ROM, we just ignore that option ROM and continue with the next one. 15 */ 16 void *pci_assign_dev_load_option_rom(PCIDevice *dev, 17 int *size, unsigned int domain, 18 unsigned int bus, unsigned int slot, 19 unsigned int function) 20 { 21 char name[32], rom_file[64]; 22 FILE *fp; 23 uint8_t val; 24 struct stat st; 25 void *ptr = NULL; 26 Object *owner = OBJECT(dev); 27 28 /* If loading ROM from file, pci handles it */ 29 if (dev->romfile || !dev->rom_bar) { 30 return NULL; 31 } 32 33 snprintf(rom_file, sizeof(rom_file), 34 "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom", 35 domain, bus, slot, function); 36 37 /* Write "1" to the ROM file to enable it */ 38 fp = fopen(rom_file, "r+"); 39 if (fp == NULL) { 40 if (errno != ENOENT) { 41 error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno)); 42 } 43 return NULL; 44 } 45 if (fstat(fileno(fp), &st) == -1) { 46 error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno)); 47 goto close_rom; 48 } 49 50 val = 1; 51 if (fwrite(&val, 1, 1, fp) != 1) { 52 goto close_rom; 53 } 54 fseek(fp, 0, SEEK_SET); 55 56 if (dev->romsize != UINT_MAX) { 57 if (st.st_size > dev->romsize) { 58 error_report("ROM BAR \"%s\" (%ld bytes) is too large for ROM size %u", 59 rom_file, (long) st.st_size, dev->romsize); 60 goto close_rom; 61 } 62 } else { 63 dev->romsize = st.st_size; 64 } 65 66 snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner)); 67 memory_region_init_ram(&dev->rom, owner, name, dev->romsize, &error_abort); 68 ptr = memory_region_get_ram_ptr(&dev->rom); 69 memset(ptr, 0xff, dev->romsize); 70 71 if (!fread(ptr, 1, st.st_size, fp)) { 72 error_report("pci-assign: Cannot read from host %s", rom_file); 73 error_printf("Device option ROM contents are probably invalid " 74 "(check dmesg).\nSkip option ROM probe with rombar=0, " 75 "or load from file with romfile=\n"); 76 goto close_rom; 77 } 78 79 pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom); 80 dev->has_rom = true; 81 *size = st.st_size; 82 close_rom: 83 /* Write "0" to disable ROM */ 84 fseek(fp, 0, SEEK_SET); 85 val = 0; 86 if (!fwrite(&val, 1, 1, fp)) { 87 XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file"); 88 } 89 fclose(fp); 90 91 return ptr; 92 } 93