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/hw.h" 7 #include "hw/i386/pc.h" 8 #include "qemu/error-report.h" 9 #include "ui/console.h" 10 #include "hw/loader.h" 11 #include "monitor/monitor.h" 12 #include "qemu/range.h" 13 #include "sysemu/sysemu.h" 14 #include "hw/pci/pci.h" 15 #include "xen_pt.h" 16 17 /* 18 * Scan the assigned devices for the devices that have an option ROM, and then 19 * load the corresponding ROM data to RAM. If an error occurs while loading an 20 * option ROM, we just ignore that option ROM and continue with the next one. 21 */ 22 void *pci_assign_dev_load_option_rom(PCIDevice *dev, 23 int *size, unsigned int domain, 24 unsigned int bus, unsigned int slot, 25 unsigned int function) 26 { 27 char name[32], rom_file[64]; 28 FILE *fp; 29 uint8_t val; 30 struct stat st; 31 void *ptr = NULL; 32 Object *owner = OBJECT(dev); 33 34 /* If loading ROM from file, pci handles it */ 35 if (dev->romfile || !dev->rom_bar) { 36 return NULL; 37 } 38 39 snprintf(rom_file, sizeof(rom_file), 40 "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom", 41 domain, bus, slot, function); 42 43 /* Write "1" to the ROM file to enable it */ 44 fp = fopen(rom_file, "r+"); 45 if (fp == NULL) { 46 if (errno != ENOENT) { 47 error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno)); 48 } 49 return NULL; 50 } 51 if (fstat(fileno(fp), &st) == -1) { 52 error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno)); 53 goto close_rom; 54 } 55 56 val = 1; 57 if (fwrite(&val, 1, 1, fp) != 1) { 58 goto close_rom; 59 } 60 fseek(fp, 0, SEEK_SET); 61 62 snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner)); 63 memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort); 64 ptr = memory_region_get_ram_ptr(&dev->rom); 65 memset(ptr, 0xff, st.st_size); 66 67 if (!fread(ptr, 1, st.st_size, fp)) { 68 error_report("pci-assign: Cannot read from host %s", rom_file); 69 error_printf("Device option ROM contents are probably invalid " 70 "(check dmesg).\nSkip option ROM probe with rombar=0, " 71 "or load from file with romfile=\n"); 72 goto close_rom; 73 } 74 75 pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom); 76 dev->has_rom = true; 77 *size = st.st_size; 78 close_rom: 79 /* Write "0" to disable ROM */ 80 fseek(fp, 0, SEEK_SET); 81 val = 0; 82 if (!fwrite(&val, 1, 1, fp)) { 83 XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file"); 84 } 85 fclose(fp); 86 87 return ptr; 88 } 89