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