| /* |
| * This is splited from hw/i386/kvm/pci-assign.c |
| */ |
| #include "qemu/osdep.h" |
| #include "qapi/error.h" |
| #include "qemu/error-report.h" |
| #include "hw/loader.h" |
| #include "hw/pci/pci.h" |
| #include "xen_pt.h" |
| |
| /* |
| * Scan the assigned devices for the devices that have an option ROM, and then |
| * load the corresponding ROM data to RAM. If an error occurs while loading an |
| * option ROM, we just ignore that option ROM and continue with the next one. |
| */ |
| void *pci_assign_dev_load_option_rom(PCIDevice *dev, |
| int *size, unsigned int domain, |
| unsigned int bus, unsigned int slot, |
| unsigned int function) |
| { |
| char name[32], rom_file[64]; |
| FILE *fp; |
| uint8_t val; |
| struct stat st; |
| void *ptr = NULL; |
| Object *owner = OBJECT(dev); |
| |
| /* If loading ROM from file, pci handles it */ |
| if (dev->romfile || !dev->rom_bar) { |
| return NULL; |
| } |
| |
| snprintf(rom_file, sizeof(rom_file), |
| "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom", |
| domain, bus, slot, function); |
| |
| /* Write "1" to the ROM file to enable it */ |
| fp = fopen(rom_file, "r+"); |
| if (fp == NULL) { |
| if (errno != ENOENT) { |
| error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno)); |
| } |
| return NULL; |
| } |
| if (fstat(fileno(fp), &st) == -1) { |
| error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno)); |
| goto close_rom; |
| } |
| |
| val = 1; |
| if (fwrite(&val, 1, 1, fp) != 1) { |
| goto close_rom; |
| } |
| fseek(fp, 0, SEEK_SET); |
| |
| snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner)); |
| memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort); |
| ptr = memory_region_get_ram_ptr(&dev->rom); |
| memset(ptr, 0xff, st.st_size); |
| |
| if (!fread(ptr, 1, st.st_size, fp)) { |
| error_report("pci-assign: Cannot read from host %s", rom_file); |
| error_printf("Device option ROM contents are probably invalid " |
| "(check dmesg).\nSkip option ROM probe with rombar=0, " |
| "or load from file with romfile=\n"); |
| goto close_rom; |
| } |
| |
| pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom); |
| dev->has_rom = true; |
| *size = st.st_size; |
| close_rom: |
| /* Write "0" to disable ROM */ |
| fseek(fp, 0, SEEK_SET); |
| val = 0; |
| if (!fwrite(&val, 1, 1, fp)) { |
| XEN_PT_WARN(dev, "%s\n", "Failed to disable pci-sysfs rom file"); |
| } |
| fclose(fp); |
| |
| return ptr; |
| } |