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

   1 /*
   2  * This is splited from hw/i386/kvm/pci-assign.c
   3  */
   4 #include <stdio.h>
   5 #include <unistd.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include "hw/hw.h"
   9 #include "hw/i386/pc.h"
  10 #include "qemu/error-report.h"
  11 #include "ui/console.h"
  12 #include "hw/loader.h"
  13 #include "monitor/monitor.h"
  14 #include "qemu/range.h"
  15 #include "sysemu/sysemu.h"
  16 #include "hw/pci/pci.h"
  17 #include "hw/pci/pci-assign.h"
  18
  19 /*
  20  * Scan the assigned devices for the devices that have an option ROM, and then
  21  * load the corresponding ROM data to RAM. If an error occurs while loading an
  22  * option ROM, we just ignore that option ROM and continue with the next one.
  23  */
  24 void *pci_assign_dev_load_option_rom(PCIDevice *dev, struct Object *owner,
  25                                      int *size, unsigned int domain,
  26                                      unsigned int bus, unsigned int slot,
  27                                      unsigned int function)
  28 {
  29     char name[32], rom_file[64];
  30     FILE *fp;
  31     uint8_t val;
  32     struct stat st;
  33     void *ptr = NULL;
  34
  35     /* If loading ROM from file, pci handles it */
  36     if (dev->romfile || !dev->rom_bar) {
  37         return NULL;
  38     }
  39
  40     snprintf(rom_file, sizeof(rom_file),
  41              "/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom",
  42              domain, bus, slot, function);
  43
  44     if (stat(rom_file, &st)) {
  45         return NULL;
  46     }
  47
  48     /* Write "1" to the ROM file to enable it */
  49     fp = fopen(rom_file, "r+");
  50     if (fp == NULL) {
  51         error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
  52         return NULL;
  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     vmstate_register_ram(&dev->rom, &dev->qdev);
  63     ptr = memory_region_get_ram_ptr(&dev->rom);
  64     memset(ptr, 0xff, st.st_size);
  65
  66     if (!fread(ptr, 1, st.st_size, fp)) {
  67         error_report("pci-assign: Cannot read from host %s", rom_file);
  68         error_printf("Device option ROM contents are probably invalid "
  69                      "(check dmesg).\nSkip option ROM probe with rombar=0, "
  70                      "or load from file with romfile=\n");
  71         goto close_rom;
  72     }
  73
  74     pci_register_bar(dev, PCI_ROM_SLOT, 0, &dev->rom);
  75     dev->has_rom = true;
  76     *size = st.st_size;
  77 close_rom:
  78     /* Write "0" to disable ROM */
  79     fseek(fp, 0, SEEK_SET);
  80     val = 0;
  81     if (!fwrite(&val, 1, 1, fp)) {
  82         DEBUG("%s\n", "Failed to disable pci-sysfs rom file");
  83     }
  84     fclose(fp);
  85
  86     return ptr;
  87 }