hw/xen/xen_pt_load_rom.c

   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 }