hw/i386/pci-assign-load-rom.c

   1 /*
   2  * This is splited from hw/i386/kvm/pci-assign.c
   3  */
   4 #include "qemu/osdep.h"
   5 #include "hw/hw.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 "sysemu/sysemu.h"
  13 #include "hw/pci/pci.h"
  14 #include "hw/pci/pci-assign.h"
  15
  16 /*
  17  * Scan the assigned devices for the devices that have an option ROM, and then
  18  * load the corresponding ROM data to RAM. If an error occurs while loading an
  19  * option ROM, we just ignore that option ROM and continue with the next one.
  20  */
  21 void *pci_assign_dev_load_option_rom(PCIDevice *dev, struct Object *owner,
  22                                      int *size, unsigned int domain,
  23                                      unsigned int bus, unsigned int slot,
  24                                      unsigned int function)
  25 {
  26     char name[32], rom_file[64];
  27     FILE *fp;
  28     uint8_t val;
  29     struct stat st;
  30     void *ptr = NULL;
  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     if (stat(rom_file, &st)) {
  42         return NULL;
  43     }
  44
  45     /* Write "1" to the ROM file to enable it */
  46     fp = fopen(rom_file, "r+");
  47     if (fp == NULL) {
  48         error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
  49         return NULL;
  50     }
  51     val = 1;
  52     if (fwrite(&val, 1, 1, fp) != 1) {
  53         goto close_rom;
  54     }
  55     fseek(fp, 0, SEEK_SET);
  56
  57     snprintf(name, sizeof(name), "%s.rom", object_get_typename(owner));
  58     memory_region_init_ram(&dev->rom, owner, name, st.st_size, &error_abort);
  59     vmstate_register_ram(&dev->rom, &dev->qdev);
  60     ptr = memory_region_get_ram_ptr(&dev->rom);
  61     memset(ptr, 0xff, st.st_size);
  62
  63     if (!fread(ptr, 1, st.st_size, fp)) {
  64         error_report("pci-assign: Cannot read from host %s", rom_file);
  65         error_printf("Device option ROM contents are probably invalid "
  66                      "(check dmesg).\nSkip option ROM probe with rombar=0, "
  67                      "or load from file with romfile=\n");
  68         goto close_rom;
  69     }
  70
  71     pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom);
  72     dev->has_rom = true;
  73     *size = st.st_size;
  74 close_rom:
  75     /* Write "0" to disable ROM */
  76     fseek(fp, 0, SEEK_SET);
  77     val = 0;
  78     if (!fwrite(&val, 1, 1, fp)) {
  79         DEBUG("%s\n", "Failed to disable pci-sysfs rom file");
  80     }
  81     fclose(fp);
  82
  83     return ptr;
  84 }