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/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 }